[devel] Imported from libpng-1.5.3beta01.tar

[devel] Update LAST_ORDINAL to 226 in png.h, to account for new API.
[devel] Use a mode bit to avoid reopening the zstream except when necessary.
2025-07-10 18:04:09 +02:00 · 2011-03-31 23:50:36 -05:00 · 2011-03-31 23:25:29 -05:00 · 2011-03-31 22:06:04 -05:00 · 2011-03-31 21:33:39 -05:00 · 2011-03-31 21:14:55 -05:00
142 changed files with 26067 additions and 10935 deletions
--- a/240
+++ b/240
@@ -1,5 +1,5 @@

-Libpng 1.5.0beta30 - June 22, 2010
+Libpng 1.5.3beta01 - April 1, 2011

 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,243 +9,25 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script

-   1.5.0beta30.tar.xz (LZMA-compressed, recommended)
-   1.5.0beta30.tar.gz
-   1.5.0beta30.tar.bz2
+   1.5.3beta01.tar.xz (LZMA-compressed, recommended)
+   1.5.3beta01.tar.gz
+   1.5.3beta01.tar.bz2

 Source files with CRLF line endings (for Windows), without the
 "configure" script

-   lp150b30.zip
-   lp150b30.7z
+   lp153b01.7z  (LZMA-compressed, recommended)
+   lp153b01.zip

 Other information:

-   1.5.0beta30-README.txt
-   1.5.0beta30-LICENSE.txt
+   1.5.3beta01-README.txt
+   1.5.3beta01-LICENSE.txt

-Changes since the last public release (1.4.1):
+Changes since the last public release (1.5.2):

-version 1.5.0beta01 [February 7, 2010]
-  Moved declaration of png_struct into private pngstruct.h and png_info
-    into pnginfo.h
-
-version 1.5.0beta02 [February 7, 2010]
-  Reverted to original png_push_save_buffer() code.
-
-version 1.5.0beta03 [February 8, 2010]
-  Return allocated "old_buffer" in png_push_save_buffer() before
-    calling png_error().
-  Updated configure script to use SO number 15.
-
-version 1.5.0beta04 [February 9, 2010]
-  Removed malformed "incomplete struct declaration" of png_info from png.h
-
-version 1.5.0beta05 [February 12, 2010]
-  Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
-    linewrapping that it entailed.
-  Revised comments in pngstruct.h and pnginfo.h and added pointers to
-    the libpng license.
-  Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
-  Removed the cbuilder5 project, which has not been updated to 1.4.0.
-
-version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
-  Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
-    Nishikawa)
-
-version 1.5.0beta07 [omitted]
-
-version 1.5.0beta08 [February 19, 2010]
-  Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
-    wherever png_snprintf() is used to construct error and warning messages.
-  Noted in scripts/makefile.mingw that it expects to be run under MSYS.
-  Removed obsolete unused MMX-querying support from contrib/gregbook
-  Added exported png_longjmp() function.
-  Removed the AIX redefinition of jmpbuf in png.h
-  Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
-    when building on AIX.
-
-version 1.5.0beta09 [February 19, 2010]
-  Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
-  Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
-
-version 1.5.0beta10 [February 25, 2010]
-  Removed unused gzio.c from contrib/pngminim gather and makefile scripts
-  Removed replacement error handlers from contrib/gregbook.  Because of
-    the new png_longjmp() function they are no longer needed.
-
-version 1.5.0beta11 [March 6, 2010]
-  Removed checking for already-included setjmp.h from pngconf.h
-  Fixed inconsistent indentations and made numerous cosmetic changes.
-
-version 1.5.0beta12 [March 9, 2010]
-  Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
-    the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
-    and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
-  Created new pngdebug.h and moved debug definitions there.
-
-version 1.5.0beta13 [March 10, 2010]
-  Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
-  Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
-    PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
-    is defined.
-  Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
-  Moved the 'config.h' support from pngconf.h to pngpriv.h
-  Removed PNGAPI from the png_longjmp_ptr typedef.
-  Eliminated dependence of pngtest.c on the private pngdebug.h file.
-  Make all png_debug macros into *unterminated* statements or
-    expressions (i.e. a trailing ';' must always be added) and correct
-    the format statements in various png_debug messages.
-
-version 1.5.0beta14 [March 14, 2010]
-  Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
-  Revised Makefile.am to account for recent additions and replacements.
-  Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
-    added ordinal numbers to the Windows DEF file and corrected the duplicated
-    ordinal numbers on CE symbols that are commented out.
-  Added back in export symbols that can be present in the Windows build but
-    are disabled by default.
-  PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
-    PNG_CALLBACK added to make callback definitions uniform.  PNGAPI split
-    into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
-    and appropriate changes made to all files.  Cygwin builds re-hinged to
-    allow procedure call standard changes and to remove the need for the DEF
-    file (fixes build on Cygwin).
-  Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
-  Changed rules for generation of the various symbol files and added a new
-    rule for a DEF file (which is also added to the distribution).
-  Updated the symbol file generation to stop it adding spurious spaces
-    to EOL (coming from preprocessor macro expansion).  Added a facility
-    to join tokens in the output and rewrite *.dfn to use this.
-  Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
-    and removed scripts/makefile.cygwin.
-  Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
-  Removed the include of sys/types.h - apparently unnecessary now on the
-    platforms on which it happened (all but Mac OS and RISC OS).
-  Moved the Mac OS test into pngpriv.h (the only place it is used.)
-
-version 1.5.0beta15 [March 17, 2010]
-  Added symbols.chk target to Makefile.am to validate the symbols in png.h
-    against the new DEF file scripts/symbols.def.
-  Changed the default DEF file back to pngwin.def.
-  Removed makefile.mingw.
-  Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
-
-version 1.5.0beta16 [April 1, 2010]
-  Made png_text_struct independent of PNG_iTXt_SUPPORTED, so that
-    fields are initialized in all configurations.  The READ/WRITE
-    macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
-    before to disable code to actually read or write iTXt chunks
-    and iTXt_SUPPORTED can be used to detect presence of either
-    read or write support (but it is probably better to check for
-    the one actually required - read or write.)
-  Combined multiple png_warning() calls for a single error.
-  Restored the macro definition of png_check_sig().
-
-version 1.5.0beta17 [April 17, 2010]
-  Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
-  Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
-    more accurately what it actually does.  At the same time, renamed
-    the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
-    PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
-  Added some "(long)" typecasts to printf calls in png_handle_cHRM().
-  Freeze build-time only configuration in the build.
-    In all prior versions of libpng most configuration options
-    controlled by compiler #defines had to be repeated by the
-    application code that used libpng.  This patch changes this
-    so that compilation options that can only be changed at build
-    time are frozen in the build.  Options that are compiler
-    dependent (and those that are system dependent) are evaluated
-    each time - pngconf.h holds these.  Options that can be changed
-    per-file in the application are in png.h.  Frozen options are
-    in the new installed header file pnglibconf.h (John Bowler)
-  Removed the xcode project because it has not been updated to work
-    with libpng-1.5.0.
-
-version 1.5.0beta18 [April 17, 2010]
-  Restored the ability to include optional pngusr.h
-  Moved replacements for png_error() and png_warning() from the
-    contrib/pngminim project to pngerror.c, for use when warnings or
-    errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
-    storing unneeded error/warning text.
-  Updated contrib/pngminim project to work with the new pnglibconf.h
-  Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
-
-version 1.5.0beta19 [April 24, 2010]
-  Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED.  This allows the functions
-    to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
-    which allows libpng to be built with the functions even though the default
-    is to use the macros - this allows applications to choose at app build
-    time whether or not to use macros (previously impossible because the
-    functions weren't in the default build.)
-  Changed Windows calling convention back to __cdecl for API functions.
-    For Windows/x86 platforms only:
-      __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
-      __cdecl throughout (both API functions and callbacks) on Windows/x86
-      platforms.
-  Replaced visualc6 and visualc71 projects with new vstudio project 
-  Relaxed the overly-restrictive permissions of some files.
-
-version 1.5.0beta20 [April 24, 2010]
-  Relaxed more overly-restrictive permissions of some files.
-
-version 1.5.0beta21 [April 27, 2010]
-  Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
-    vstudio project files, and some trivial editing of some files in the
-    scripts directory.
-  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
-    contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
-
-version 1.5.0beta22 [April 28, 2010]
-  Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
-    because it has a macro equivalent.
-  Improved the options.awk script; added an "everything off" option.
-  Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
-
-version 1.5.0beta23 [April 29, 2010]
-  Corrected PNG_REMOVED macro to take five arguments.
-    The macro was documented with two arguments (name,ordinal), however
-    the symbol checking .dfn files assumed five arguments.  The five
-    argument form seems more useful so it is changed to that.
-  Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-    in gregbook/readpng2.c
-  Corrected protection of png_get_user_transform_ptr. The API declaration in
-    png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
-    but was left defined in pngtrans.c
-  Added logunsupported=1 to cause pnglibconf.h to document disabled options.
-    This makes the installed pnglibconf.h more readable but causes no
-    other change.  The intention is that users of libpng will find it
-    easier to understand if an API they need is missing.
-  Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
-  Removed dummy_inflate.c from contrib/pngminim/encoder
-  Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
-
-version 1.5.0beta24 [May 7, 2010]
-  Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
-    offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
-  Added more blank lines for readability.
-
-version 1.5.0beta25 [June 22, 2010]
-  In pngpread.c: png_push_have_row() add check for new_row > height
-  Removed the now-redundant check for out-of-bounds new_row from example.c
-
-version 1.5.0beta26 [June 18, 2010]
-  In pngpread.c: png_push_process_row() add check for too many rows.
-
-version 1.5.0beta27 [June 18, 2010]
-  Removed the check added in beta25 as it is now redundant.
-
-version 1.5.0beta28 [June 19, 2010]
-  Rewrote png_process_IDAT_data to consistently treat extra data as warnings
-    and handle end conditions more cleanly.
-  Removed the new (beta26) check in png_push_process_row().
-
-version 1.5.0beta29 [June 21, 2010]
-  Revised scripts/options.awk to work on Sunos (but still doesn't work)
-  Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
-
-version 1.5.0beta30 [June 22, 2010]
-  Stop memory leak when reading a malformed sCAL chunk.
+Version 1.5.3beta01 [April 1, 2011]
+  Re-initialize the zlib compressor before compressing non-IDAT chunks.

 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
--- a/1729
+++ b/1729
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,20 +1,31 @@
-cmake_minimum_required(VERSION 2.4.3)
+cmake_minimum_required(VERSION 2.4.4)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)

 if(UNIX AND NOT DEFINED CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING 
-      "Choose the type of build, options are:
-         None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
-         Debug
-         Release
-         RelWithDebInfo
-         MinSizeRel.")
+  if(CMAKE_MAJOR_VERSION EQUAL 2 AND CMAKE_MINOR_VERSION EQUAL 4)
+    # workaround CMake 2.4.x bug
+    set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
+        "Choose the type of build, options are:
+           None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
+           Debug
+           Release
+           RelWithDebInfo
+           MinSizeRel.")
+  else()
+    set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
+        "Choose the type of build, options are:
+           None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
+           Debug
+           Release
+           RelWithDebInfo
+           MinSizeRel.")
+  endif()
 endif()

 project(libpng C)
 enable_testing()

-# Copyright (C) 2007-2010 Glenn Randers-Pehrson
+# Copyright (C) 2007-2011 Glenn Randers-Pehrson

 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
@@ -22,7 +33,7 @@ enable_testing()

 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
-set(PNGLIB_RELEASE 0)
+set(PNGLIB_RELEASE 3)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})

@@ -96,12 +107,23 @@ set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")

+# Use the prebuilt pnglibconf.h file from the scripts folder
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
+               ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})

 # OUR SOURCES
-set(libpng_sources
+set(libpng_public_hdrs
  png.h
  pngconf.h
+  ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h
+)
+set(libpng_sources
+  ${libpng_public_hdrs}
+  pngdebug.h
+  pnginfo.h
  pngpriv.h
+  pngstruct.h
  png.c
  pngerror.c
  pngget.c
@@ -123,8 +145,14 @@ set(pngtest_sources
 )
 # SOME NEEDED DEFINITIONS

+add_definitions(-DPNG_CONFIGURE_LIBPNG)
+
+if(_AIX)
+  add_definitions(-D_ALL_SOURCE)
+endif(_AIX)
+
 if(MSVC)
-  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
+  add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)

 if(PNG_SHARED OR  NOT MSVC)
@@ -146,7 +174,7 @@ if(PNG_NO_STDIO)
 endif()

 if(PNG_DEBUG)
-  add_definitions(-DPNG_DEBUG=1)
+  add_definitions(-DPNG_DEBUG)
 endif()

 if(NOT M_LIBRARY AND NOT WIN32)
@@ -161,6 +189,7 @@ if(PNG_SHARED)
  if(MSVC)
    # msvc does not append 'lib' - do it here to have consistent name
    set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
+    set_target_properties(${PNG_LIB_NAME} PROPERTIES IMPORT_PREFIX "lib")
  endif()
  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
@@ -173,6 +202,7 @@ if(PNG_STATIC)
    # msvc does not append 'lib' - do it here to have consistent name
    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
  endif()
+  target_link_libraries(${PNG_LIB_NAME_STATIC} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()


@@ -184,61 +214,152 @@ if(PNG_TESTS AND PNG_SHARED)
  # does not work with msvc due to png_lib_ver issue
  add_executable(pngtest ${pngtest_sources})
  target_link_libraries(pngtest ${PNG_LIB_NAME})
-  add_test(pngtest pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
+  add_test(pngtest ./pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
 endif()

+#
+# Set a variable with CMake code which:
+# Creates a symlink from src to dest (if possible) or alternatively
+# copies if different.
+macro(_png_generate_symlink_code CODE SRC DEST)
+  if(WIN32 AND NOT CYGWIN)
+    set(_png_gsc_message "Copying ${SRC} to ${DEST} if needed")
+    set(_png_gsc_operation "copy_if_different")
+  else()
+    set(_png_gsc_message "Symlinking ${SRC} to ${DEST}")
+    set(_png_gsc_operation "create_symlink")
+  endif()
+
+  set(${CODE} "
+    message(STATUS \"${_png_gsc_message}\")
+    execute_process(COMMAND \${CMAKE_COMMAND} -E ${_png_gsc_operation}
+      \"${SRC}\" \"${DEST}\")
+    ")
+endmacro()

 # CREATE PKGCONFIG FILES
 # we use the same files like ./configure, so we have to set its vars
+if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
+  set(CMAKE_INSTALL_LIBDIR lib)
+endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
 set(prefix      ${CMAKE_INSTALL_PREFIX})
 set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)
+set(libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
 set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
-
+set(LIBS        "-lz -lm")
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
+_png_generate_symlink_code(PNG_PC_INSTALL_CODE
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
  ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc)
+install(CODE ${PNG_PC_INSTALL_CODE})
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
+_png_generate_symlink_code(PNG_CONFIG_INSTALL_CODE
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
  ${CMAKE_CURRENT_BINARY_DIR}/libpng-config)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
-  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
-  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config)
+install(CODE ${PNG_CONFIG_INSTALL_CODE})

 # SET UP LINKS
 if(PNG_SHARED)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.0beta30
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.3beta01
    VERSION 15.${PNGLIB_RELEASE}.0
    SOVERSION 15
    CLEAN_DIRECT_OUTPUT 1)
 endif()
 if(PNG_STATIC)
-  if(NOT WIN32)
-    # that's uncool on win32 - it overwrites our static import lib...
+  # MSVC doesn't use a different file extension for shared vs. static
+  # libs.  We are able to change OUTPUT_NAME to remove the _static
+  # for all other platforms.
+  if(NOT MSVC)
    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
      OUTPUT_NAME ${PNG_LIB_NAME}
      CLEAN_DIRECT_OUTPUT 1)
  endif()
 endif()

+# If CMake > 2.4.x, we set a variable used below to export
+# targets to an export file.
+# TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
+if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
+  set(PNG_EXPORT_RULE EXPORT libpng)
+elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
+  set(PNG_EXPORT_RULE EXPORT libpng)
+endif()
+
 # INSTALL
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
  if(PNG_SHARED)
    install(TARGETS ${PNG_LIB_NAME}
-            RUNTIME DESTINATION bin
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
+        ${PNG_EXPORT_RULE}
+        RUNTIME DESTINATION bin
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+    # Create a symlink for libpng.dll.a => libpng15.dll.a on Cygwin
+    if(CYGWIN)
+      _png_generate_symlink_code(PNG_SHARED_IMPLIB_INSTALL_CODE
+        ${PNGLIB_NAME}${CMAKE_IMPORT_LIBRARY_SUFFIX}
+        libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
+      install(CODE ${PNG_SHARED_IMPLIB_INSTALL_CODE})
+      install(FILES
+        ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
+        DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    endif()
+
+    if(NOT WIN32)
+      IF(CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+        _png_generate_symlink_code(PNG_SHARED_INSTALL_CODE
+ ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${PNGLIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX}
+ ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
+                install(CODE ${PNG_SHARED_INSTALL_CODE})
+                install(FILES
+ ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
+                DESTINATION ${CMAKE_INSTALL_LIBDIR})
+      ELSE(CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+        _png_generate_symlink_code(PNG_SHARED_INSTALL_CODE
+           ${PNGLIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX}
+           libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
+        install(CODE ${PNG_SHARED_INSTALL_CODE})
+        install(FILES
+           ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
+                DESTINATION ${CMAKE_INSTALL_LIBDIR})
+      ENDIF(CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+    endif()
  endif()
+
  if(PNG_STATIC)
    install(TARGETS ${PNG_LIB_NAME_STATIC}
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
+        ${PNG_EXPORT_RULE}
+            LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+            ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    if(NOT WIN32 OR CYGWIN)
+      IF(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+         _png_generate_symlink_code(PNG_STATIC_INSTALL_CODE
+${CMAKE_ARCHIVE_OUTPUT_DIRECTORY}/${PNGLIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX}
+        ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
+        install(CODE ${PNG_STATIC_INSTALL_CODE})
+        install(FILES
+          ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
+             DESTINATION ${CMAKE_INSTALL_LIBDIR})
+      ELSE(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+        _png_generate_symlink_code(PNG_STATIC_INSTALL_CODE
+           ${PNGLIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX}
+           libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
+        install(CODE ${PNG_STATIC_INSTALL_CODE})
+        install(FILES
+          ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
+                     DESTINATION ${CMAKE_INSTALL_LIBDIR})
+      ENDIF(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+    endif()
  endif()
 endif()

 if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
-  install(FILES png.h pngconf.h         DESTINATION include)
-  install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})
+  install(FILES ${libpng_public_hdrs}   DESTINATION include)
+  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
 endif()
 if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
@@ -247,20 +368,29 @@ if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
 endif()
 if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
  # Install man pages
-  install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
-  install(FILES png.5                           DESTINATION man/man5)
+  if(NOT PNG_MAN_DIR)
+    set(PNG_MAN_DIR "share/man")
+  endif()
+  install(FILES libpng.3 libpngpf.3      DESTINATION ${PNG_MAN_DIR}/man3)
+  install(FILES png.5                    DESTINATION ${PNG_MAN_DIR}/man5)
  # Install pkg-config files
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
-          DESTINATION lib/pkgconfig)
-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
          DESTINATION bin)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
-          DESTINATION lib/pkgconfig)
-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
          DESTINATION bin)
 endif()

-# what's with libpng.txt and all the extra files?
+# On versions of CMake that support it, create an export file CMake
+# users can include() to import our targets
+if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
+  install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
+endif()
+
+# what's with libpng-$VER%.txt and all the extra files?


 # UNINSTALL
--- a/46
+++ b/46
@@ -1,5 +1,5 @@

-Installing libpng version 1.5.0beta30 - June 22, 2010
+Installing libpng

 On Unix/Linux and similar systems, you can simply type

@@ -13,10 +13,16 @@ If configure does not work on your system and you have a reasonably
 up-to-date set of tools, running ./autogen.sh before running ./configure
 may fix the problem.  You can also run the individual commands in
 autogen.sh with the --force option, if supported by your version of
-the tools.  If you run 'libtoolize --force', though, this will replace
-the distributed, patched, version of ltmain.sh with an unpatched version
-and your shared library builds may fail to produce libraries with the
-correct version numbers.
+the tools.  To be really sure that you aren't using any of the included
+pre-built scripts, you can do this:
+
+    ./configure --enable-maintainer-mode
+    make maintainer-clean
+    ./autogen.sh
+    ./configure [--prefix=/path] [other options]
+    make
+    make install
+    make check

 Instead, you can use one of the custom-built makefiles in the
 "scripts" directory
@@ -46,8 +52,8 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.

 You can rename the directories that you downloaded (they
-might be called "libpng-1.5.0beta30" or "libpng15" and "zlib-1.2.3"
-or "zlib123") so that you have directories called "zlib" and "libpng".
+might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.5"
+or "zlib125") so that you have directories called "zlib" and "libpng".

 Your directory structure should look like this:

@@ -60,8 +66,8 @@ Your directory structure should look like this:
          CMakeLists.txt    =>  "cmake" script
          configuration files:
             configure.ac, configure, Makefile.am, Makefile.in,
-             autogen.sh, config.guess, ltmain.sh, missing,
-             aclocal.m4, config.h.in, config.sub,
+             autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
+             libpng-config.in, aclocal.m4, config.h.in, config.sub,
             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
          contrib
             gregbook
@@ -70,13 +76,12 @@ Your directory structure should look like this:
             pngsuite
             visupng
          projects
-             cbuilder5 (Borland)
-             visualc6 (msvc)
             visualc71
-             xcode
+             vstudio
          scripts
             makefile.*
             *.def (module definition files)
+             etc.
          pngtest.png
          etc.
      zlib
@@ -107,7 +112,7 @@ scripts directory into this directory, for example
 Read the makefile to see if you need to change any source or
 target directories to match your preferences.

-Then read pngconf.h to see if you want to make any configuration
+Then read pnglibconf.dfa to see if you want to make any configuration
 changes.

 Then just run "make" which will create the libpng library in
@@ -125,19 +130,6 @@ do that, run "make install" in the zlib directory first if necessary).
 Some also allow you to run "make test-installed" after you have
 run "make install".

-If you encounter a compiler error message complaining about the
-lines
-
-      __png.h__ already includes setjmp.h;
-      __dont__ include it again.;
-
-this means you have compiled another module that includes setjmp.h,
-which is hazardous because the two modules might not include exactly
-the same setjmp.h.  If you are sure that you know what you are doing
-and that they are exactly the same, then you can comment out or
-delete the two lines.  Better yet, use the cexcept interface
-instead, as demonstrated in contrib/visupng of the libpng distribution.
-
-Further information can be found in the README and libpng.txt
+Further information can be found in the README and libpng-manual.txt
 files, in the individual makefiles, in png.h, and the manual pages
 libpng.3 and png.5.
--- a/6
+++ b/6
@@ -10,8 +10,8 @@ this sentence.

 This code is released under the libpng license.

-libpng versions 1.2.6, August 15, 2004, through 1.5.0beta30, June 22, 2010, are
-Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+libpng versions 1.2.6, August 15, 2004, through 1.5.3beta01, April 1, 2011, are
+Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors

@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-June 22, 2010
+April 1, 2011
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,13 +5,19 @@
 PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@

 # libpng does not follow GNU file name conventions
-AUTOMAKE_OPTIONS = foreign color-tests
+
+# "color-tests" requires automake 1.11.1 or later.  Enable it if you like,
+# to get red "FAIL" and green "PASS" notations during tests.
+# AUTOMAKE_OPTIONS = foreign color-tests
+AUTOMAKE_OPTIONS = foreign

 # test programs - run on make check, make distcheck
-check_PROGRAMS= pngtest
+check_PROGRAMS= pngtest pngvalid
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-TESTS = test-pngtest.sh
+pngvalid_SOURCES = pngvalid.c
+pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+TESTS = test-pngtest.sh test-pngvalid-simple.sh test-pngvalid-full.sh
 TESTS_ENVIRONMENT= srcdir=$(srcdir) 

 # man pages
@@ -25,11 +31,10 @@ bin_SCRIPTS= @binconfigs@
 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES=libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngset.c pngget.c pngrutil.c \
-	pngtrans.c pngwutil.c \
-	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
-	pngwtran.c pngmem.c pngerror.c pngpread.c \
-	png.h pngconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
+	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
+	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
+	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h

 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h

@@ -64,18 +69,25 @@ EXTRA_DIST= \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
 	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) \
-	CMakeLists.txt example.c libpng-@PNGLIB_VERSION@.txt
+	CMakeLists.txt example.c libpng-manual.txt

 SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk scripts/pnglibconf.dfn

 CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
-	pngwin.def check.new pnglibconf.* symbols.new \
+	check.new pnglibconf.* symbols.new pngtest-log.txt \
 	$(SCRIPT_CLEANFILES)

 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
+
 SUFFIXES = .chk .dfn .out

 $(PNGLIB_BASENAME).pc: libpng.pc
@@ -85,7 +97,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 	cp libpng-config $@

 scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
-scripts/symbols.out scripts/pngwin.out: png.h pngconf.h scripts/pnglibconf.h
+scripts/symbols.out: png.h pngconf.h scripts/pnglibconf.h.prebuilt

 libpng.sym: scripts/sym.out
 	rm -f $@
@@ -93,27 +105,33 @@ libpng.sym: scripts/sym.out
 libpng.vers: scripts/vers.out
 	rm -f $@
 	cp $? $@
-pngwin.def: scripts/pngwin.out
-	rm -f $@
-	cp $? $@
 pnglibconf.h: pnglibconf.out
 	rm -f $@
 	cp $? $@
-scripts/pnglibconf.h:
+scripts/pnglibconf.h.prebuilt:
 	@echo "This is a machine generated file, but if you want to make" >&2
 	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1

+# The following is necessary to ensure that the local pnglibconf.h is used, not
+# an installed one (this can happen immediately after on a clean system if
+# 'make test' is the first thing the user does.)
+pngvalid.o pngtest.o: pnglibconf.h
+
+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this stops the read macros interfering
+# with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE

 .dfn.out:
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
-	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c >dfn1.out
+	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
 	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
 	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
@@ -130,7 +148,6 @@ pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
 	mv dfn2.out $@

 # Symbol checks (.def and .out files should match)
-scripts/pngwin.chk: scripts/checksym.awk scripts/pngwin.def scripts/pngwin.out
 scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
 .out.chk:
 	rm -f $@ symbols.new
@@ -145,7 +162,7 @@ scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
 	test -z "$(CPPFLAGS)" 
 	echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
 	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out\
-	    logunsupported=1 - ${srcdir}/scripts/pnglibconf.dfa 1>&2
+	    logunsupported=3 - ${srcdir}/scripts/pnglibconf.dfa 1>&2
 	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@
@@ -156,7 +173,7 @@ $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
 test: check-am

 # Extra checks
-check: scripts/symbols.chk scripts/pngwin.chk
+check: scripts/symbols.chk

 # Don't distribute the generated script files
 dist-hook:
@@ -179,7 +196,7 @@ install-exec-hook:
 	cd $(DESTDIR)$(bindir); $(LN_S) $(PNGLIB_BASENAME)-config libpng-config
 	@set -x;\
 	cd $(DESTDIR)$(libdir);\
-	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib; do\
+	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib dll.a; do\
 		rm -f libpng.$$ext;\
                if test -f $(PNGLIB_BASENAME).$$ext; then\
                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.11 from Makefile.am.
+# Makefile.in generated by automake 1.11.1 from Makefile.am.
 # @configure_input@

 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -40,7 +40,7 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
-check_PROGRAMS = pngtest$(EXEEXT)
+check_PROGRAMS = pngtest$(EXEEXT) pngvalid$(EXEEXT)
@HAVE_LD_VERSION_SCRIPT_TRUE@am__append_1 = -Wl,--version-script=libpng.vers
@HAVE_LD_VERSION_SCRIPT_FALSE@am__append_2 = -export-symbols libpng.sym
 subdir = .
@@ -49,14 +49,14 @@ DIST_COMMON = README $(am__configure_deps) $(dist_man_MANS) \
 	$(srcdir)/Makefile.in $(srcdir)/config.h.in \
 	$(srcdir)/libpng-config.in $(srcdir)/libpng.pc.in \
 	$(top_srcdir)/configure INSTALL TODO config.guess config.sub \
-	depcomp install-sh ltmain.sh missing mkinstalldirs
+	depcomp install-sh ltmain.sh missing
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \
 configure.lineno config.status.lineno
-mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
+mkinstalldirs = $(install_sh) -d
 CONFIG_HEADER = config.h
 CONFIG_CLEAN_FILES = libpng.pc libpng-config
 CONFIG_CLEAN_VPATH_FILES =
@@ -89,20 +89,20 @@ LTLIBRARIES = $(lib_LTLIBRARIES)
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LIBADD =
 am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrio.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	$(am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS) \
@@ -115,6 +115,9 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LINK = $(LIBTOOL) --tag=CC \
 am_pngtest_OBJECTS = pngtest.$(OBJEXT)
 pngtest_OBJECTS = $(am_pngtest_OBJECTS)
 pngtest_DEPENDENCIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+am_pngvalid_OBJECTS = pngvalid.$(OBJEXT)
+pngvalid_OBJECTS = $(am_pngvalid_OBJECTS)
+pngvalid_DEPENDENCIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 SCRIPTS = $(bin_SCRIPTS)
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp = $(SHELL) $(top_srcdir)/depcomp
@@ -131,9 +134,9 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	$(LDFLAGS) -o $@
 SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
 	$(nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
-	$(pngtest_SOURCES)
+	$(pngtest_SOURCES) $(pngvalid_SOURCES)
 DIST_SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
-	$(pngtest_SOURCES)
+	$(pngtest_SOURCES) $(pngvalid_SOURCES)
 man3dir = $(mandir)/man3
 man5dir = $(mandir)/man5
 NROFF = nroff
@@ -142,21 +145,8 @@ DATA = $(pkgconfig_DATA)
 HEADERS = $(nodist_pkginclude_HEADERS) $(pkginclude_HEADERS)
 ETAGS = etags
 CTAGS = ctags
-# If stdout is a non-dumb tty, use colors.  If test -t is not supported,
-# then this fails; a conservative approach.  Of course do not redirect
-# stdout here, just stderr.
 am__tty_colors = \
-red=; grn=; lgn=; blu=; std=; \
-test "X$(AM_COLOR_TESTS)" != Xno \
-&& test "X$$TERM" != Xdumb \
-&& { test "X$(AM_COLOR_TESTS)" = Xalways || test -t 1 2>/dev/null; } \
-&& { \
-  red='[0;31m'; \
-  grn='[0;32m'; \
-  lgn='[1;32m'; \
-  blu='[1;34m'; \
-  std='[m'; \
-}
+red=; grn=; lgn=; blu=; std=
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -187,6 +177,13 @@ CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
+
+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
 DLLTOOL = @DLLTOOL@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
@@ -213,6 +210,7 @@ LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
@@ -244,6 +242,7 @@ abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@
 abs_top_builddir = @abs_top_builddir@
 abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
 ac_ct_CC = @ac_ct_CC@
 ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
 am__include = @am__include@
@@ -279,7 +278,6 @@ libdir = @libdir@
 libexecdir = @libexecdir@
 localedir = @localedir@
 localstatedir = @localstatedir@
-lt_ECHO = @lt_ECHO@
 mandir = @mandir@
 mkdir_p = @mkdir_p@
 oldincludedir = @oldincludedir@
@@ -302,10 +300,16 @@ top_srcdir = @top_srcdir@
 PNGLIB_BASENAME = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@

 # libpng does not follow GNU file name conventions
-AUTOMAKE_OPTIONS = foreign color-tests
+
+# "color-tests" requires automake 1.11.1 or later.  Enable it if you like,
+# to get red "FAIL" and green "PASS" notations during tests.
+# AUTOMAKE_OPTIONS = foreign color-tests
+AUTOMAKE_OPTIONS = foreign
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-TESTS = test-pngtest.sh
+pngvalid_SOURCES = pngvalid.c
+pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+TESTS = test-pngtest.sh test-pngvalid-simple.sh test-pngvalid-full.sh
 TESTS_ENVIRONMENT = srcdir=$(srcdir) 

 # man pages
@@ -316,11 +320,10 @@ bin_SCRIPTS = @binconfigs@
 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngset.c pngget.c pngrutil.c \
-	pngtrans.c pngwutil.c \
-	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
-	pngwtran.c pngmem.c pngerror.c pngpread.c \
-	png.h pngconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
+	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
+	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
+	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h

 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@
@@ -340,21 +343,26 @@ EXTRA_DIST = \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
 	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) \
-	CMakeLists.txt example.c libpng-@PNGLIB_VERSION@.txt
+	CMakeLists.txt example.c libpng-manual.txt

 SCRIPT_CLEANFILES = scripts/*.out scripts/*.chk scripts/pnglibconf.dfn
 CLEANFILES = dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
-	pngwin.def check.new pnglibconf.* symbols.new \
+	check.new pnglibconf.* symbols.new pngtest-log.txt \
 	$(SCRIPT_CLEANFILES)

 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

 SUFFIXES = .chk .dfn .out
+
+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this stops the read macros interfering
+# with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE

 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am
@@ -461,6 +469,9 @@ clean-checkPROGRAMS:
 pngtest$(EXEEXT): $(pngtest_OBJECTS) $(pngtest_DEPENDENCIES) 
 	@rm -f pngtest$(EXEEXT)
 	$(LINK) $(pngtest_OBJECTS) $(pngtest_LDADD) $(LIBS)
+pngvalid$(EXEEXT): $(pngvalid_OBJECTS) $(pngvalid_DEPENDENCIES) 
+	@rm -f pngvalid$(EXEEXT)
+	$(LINK) $(pngvalid_OBJECTS) $(pngvalid_LDADD) $(LIBS)
 install-binSCRIPTS: $(bin_SCRIPTS)
 	@$(NORMAL_INSTALL)
 	test -z "$(bindir)" || $(MKDIR_P) "$(DESTDIR)$(bindir)"
@@ -518,6 +529,7 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngtest.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngvalid.Po@am__quote@

 .c.o:
@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
@@ -547,12 +559,12 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo: png.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo `test -f 'png.c' || echo '$(srcdir)/'`png.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo: pngset.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo `test -f 'pngset.c' || echo '$(srcdir)/'`pngset.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngset.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo' libtool=yes @AMDEPBACKSLASH@
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo: pngerror.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngerror.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo `test -f 'pngset.c' || echo '$(srcdir)/'`pngset.c
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c

 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo: pngget.c
@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo `test -f 'pngget.c' || echo '$(srcdir)/'`pngget.c
@@ -561,26 +573,19 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo: pngget.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo `test -f 'pngget.c' || echo '$(srcdir)/'`pngget.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo: pngrutil.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo `test -f 'pngrutil.c' || echo '$(srcdir)/'`pngrutil.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngrutil.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo' libtool=yes @AMDEPBACKSLASH@
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo: pngmem.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngmem.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo `test -f 'pngrutil.c' || echo '$(srcdir)/'`pngrutil.c
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo: pngtrans.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo `test -f 'pngtrans.c' || echo '$(srcdir)/'`pngtrans.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngtrans.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo' libtool=yes @AMDEPBACKSLASH@
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo: pngpread.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngpread.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo `test -f 'pngtrans.c' || echo '$(srcdir)/'`pngtrans.c
-
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo: pngwutil.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngwutil.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c

 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo: pngread.c
@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo `test -f 'pngread.c' || echo '$(srcdir)/'`pngread.c
@@ -596,6 +601,34 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrio.lo: pngrio.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrio.lo `test -f 'pngrio.c' || echo '$(srcdir)/'`pngrio.c

+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo: pngrtran.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngrtran.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
+
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo: pngrutil.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo `test -f 'pngrutil.c' || echo '$(srcdir)/'`pngrutil.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngrutil.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo `test -f 'pngrutil.c' || echo '$(srcdir)/'`pngrutil.c
+
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo: pngset.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo `test -f 'pngset.c' || echo '$(srcdir)/'`pngset.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngset.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo `test -f 'pngset.c' || echo '$(srcdir)/'`pngset.c
+
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo: pngtrans.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo `test -f 'pngtrans.c' || echo '$(srcdir)/'`pngtrans.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngtrans.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo `test -f 'pngtrans.c' || echo '$(srcdir)/'`pngtrans.c
+
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo: pngwio.c
@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo `test -f 'pngwio.c' || echo '$(srcdir)/'`pngwio.c
@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.Plo
@@ -610,13 +643,6 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo: pngwrite.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo `test -f 'pngwrite.c' || echo '$(srcdir)/'`pngwrite.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo: pngrtran.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngrtran.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
-
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo: pngwtran.c
@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo `test -f 'pngwtran.c' || echo '$(srcdir)/'`pngwtran.c
@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Plo
@@ -624,26 +650,12 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo: pngwtran.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo `test -f 'pngwtran.c' || echo '$(srcdir)/'`pngwtran.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo: pngmem.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngmem.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo' libtool=yes @AMDEPBACKSLASH@
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo: pngwutil.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngwutil.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c
-
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo: pngerror.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngerror.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c
-
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo: pngpread.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngpread.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c

 mostlyclean-libtool:
 	-rm -f *.lo
@@ -983,7 +995,8 @@ distdir: $(DISTFILES)
 	  top_distdir="$(top_distdir)" distdir="$(distdir)" \
 	  dist-hook
 	-test -n "$(am__skip_mode_fix)" \
-	|| find "$(distdir)" -type d ! -perm -777 -exec chmod a+rwx {} \; -o \
+	|| find "$(distdir)" -type d ! -perm -755 \
+		-exec chmod u+rwx,go+rx {} \; -o \
 	  ! -type d ! -perm -444 -links 1 -exec chmod a+r {} \; -o \
 	  ! -type d ! -perm -400 -exec chmod a+r {} \; -o \
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
@@ -1027,17 +1040,17 @@ dist dist-all: distdir
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gunzip -c $(distdir).tar.gz | $(am__untar) ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
-	  bunzip2 -c $(distdir).tar.bz2 | $(am__untar) ;;\
+	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lzma*) \
-	  unlzma -c $(distdir).tar.lzma | $(am__untar) ;;\
+	  lzma -dc $(distdir).tar.lzma | $(am__untar) ;;\
 	*.tar.xz*) \
 	  xz -dc $(distdir).tar.xz | $(am__untar) ;;\
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gunzip -c $(distdir).shar.gz | unshar ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac
@@ -1252,7 +1265,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 	cp libpng-config $@

 scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
-scripts/symbols.out scripts/pngwin.out: png.h pngconf.h scripts/pnglibconf.h
+scripts/symbols.out: png.h pngconf.h scripts/pnglibconf.h.prebuilt

 libpng.sym: scripts/sym.out
 	rm -f $@
@@ -1260,23 +1273,25 @@ libpng.sym: scripts/sym.out
 libpng.vers: scripts/vers.out
 	rm -f $@
 	cp $? $@
-pngwin.def: scripts/pngwin.out
-	rm -f $@
-	cp $? $@
 pnglibconf.h: pnglibconf.out
 	rm -f $@
 	cp $? $@
-scripts/pnglibconf.h:
+scripts/pnglibconf.h.prebuilt:
 	@echo "This is a machine generated file, but if you want to make" >&2
 	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1

+# The following is necessary to ensure that the local pnglibconf.h is used, not
+# an installed one (this can happen immediately after on a clean system if
+# 'make test' is the first thing the user does.)
+pngvalid.o pngtest.o: pnglibconf.h
+
 .dfn.out:
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
-	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c >dfn1.out
+	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
 	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
 	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
@@ -1293,7 +1308,6 @@ pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
 	mv dfn2.out $@

 # Symbol checks (.def and .out files should match)
-scripts/pngwin.chk: scripts/checksym.awk scripts/pngwin.def scripts/pngwin.out
 scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
 .out.chk:
 	rm -f $@ symbols.new
@@ -1319,7 +1333,7 @@ $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
 test: check-am

 # Extra checks
-check: scripts/symbols.chk scripts/pngwin.chk
+check: scripts/symbols.chk

 # Don't distribute the generated script files
 dist-hook:
@@ -1342,7 +1356,7 @@ install-exec-hook:
 	cd $(DESTDIR)$(bindir); $(LN_S) $(PNGLIB_BASENAME)-config libpng-config
 	@set -x;\
 	cd $(DESTDIR)$(libdir);\
-	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib; do\
+	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib dll.a; do\
 		rm -f libpng.$$ext;\
                if test -f $(PNGLIB_BASENAME).$$ext; then\
                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
--- a/8
+++ b/8
@@ -1,4 +1,4 @@
-README for libpng version 1.5.0beta30 - June 22, 2010 (shared library 15.0)
+README for libpng version 1.5.3beta01 - April 1, 2011 (shared library 15.0)
 See the note about version numbers near the top of png.h

 See INSTALL for instructions on how to install libpng.
@@ -58,7 +58,7 @@ on the PNG-implement mailing list and not on material submitted
 privately to Guy, Andreas, or Glenn.  They will forward any good
 suggestions to the list.

-For a detailed description on using libpng, read libpng.txt.  For
+For a detailed description on using libpng, read libpng-manual.txt.  For
 examples of libpng in a program, see example.c and pngtest.c.  For usage
 information and restrictions (what little they are) on libpng, see
 png.h.  For a description on using zlib (the compression library used by
@@ -141,8 +141,8 @@ Files in this distribution:
      TODO          =>  Things not implemented in the current library
      Y2KINFO       =>  Statement of Y2K compliance
      example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng (includes libpng.txt)
-      libpng.txt    =>  Description of libpng and its functions
+      libpng.3      =>  manual page for libpng (includes libpng-manual.txt)
+      libpng-manual.txt  =>  Description of libpng and its functions
      libpngpf.3    =>  manual page for libpng's private functions
      png.5         =>  manual page for the PNG format
      png.c         =>  Basic interface functions common to library
--- a/5
+++ b/5
@@ -2,7 +2,6 @@
 TODO - list of things to do for libpng:

 Final bug fixes.
-Finish work on the no-floating-point version (including gamma compensation)
 Better C++ wrapper/full C++ implementation?
 Fix problem with C++ and EXTERN "C".
 cHRM transformation.
@@ -17,14 +16,12 @@ Better filter selection
   (counting huffman bits/precompression?  filter inertia?  filter costs?).
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
-Build gamma tables using fixed point (and do away with floating point entirely).
 Avoid building gamma tables whenever possible.
 Use greater precision when changing to linear gamma for compositing against
  background and doing rgb-to-gray transformation.
 Investigate pre-incremented loop counters and other loop constructions.
 Add interpolated method of handling interlacing.
-Provide for conditional compilation of 16-bit support (except for the
-  initial stripping down to 8-bits when reading a 16-bit PNG datastream).
 Switch to the simpler zlib (zlib/libpng) license if legally possible.
+Extend pngvalid.c to validate more of the libpng transformations.

 */
--- a/aclocal.m4
+++ b/aclocal.m4
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,22 +4,31 @@
 #
 # WARNING: if you run this you will change the versions
 # of the tools which are used and, maybe, required!
-        touch Makefile.am configure.ac
+
+# You can define your own replacements in your environment.
+# $AUTOCONF,  $AUTOMAKE, $AUTOHEADER, $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
+
+touch Makefile.am configure.ac
 {
-	echo "running libtoolize" >&2
-	libtoolize --force --copy --automake
+   LT=${LIBTOOLIZE-libtoolize}
+   echo "running $LT" >&2
+   $LT --force --copy --automake
 } && {
-	echo "running aclocal" >&2
-	aclocal
+   AL=${ACLOCAL-aclocal}
+   echo "running $AL" >&2
+   $AL
 } && {
-	echo "running autoheader [ignore the warnings]" >&2
-	autoheader
+   AH=${AUTOHEADER-autoheader}
+   echo "running $AH [ignore the warnings]" >&2
+   $AH
 } && {
-	echo "running automake" >&2
-	automake --force-missing --foreign -a -c
+   AM=${AUTOMAKE-automake}
+   echo "running $AM" >&2
+   $AM --force-missing --foreign -a -c
 } && {
-	echo "running autoconf" >&2
-	autoconf
+   AC=${AUTOCONF-autoconf}
+   echo "running $AC" >&2
+   $AC
 } &&
-	echo "autogen complete" >&2 ||
-	echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
+   echo "autogen complete" >&2 ||
+   echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
--- a/config.guess
+++ b/config.guess
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
 #   Free Software Foundation, Inc.

-timestamp='2009-04-27'
+timestamp='2009-11-20'

 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -27,16 +27,16 @@ timestamp='2009-04-27'
 # the same distribution terms that you use for the rest of that program.


-# Originally written by Per Bothner <per@bothner.com>.
-# Please send patches to <config-patches@gnu.org>.  Submit a context
-# diff and a properly formatted ChangeLog entry.
+# Originally written by Per Bothner.  Please send patches (context
+# diff format) to <config-patches@gnu.org> and include a ChangeLog
+# entry.
 #
 # This script attempts to guess a canonical system name similar to
 # config.sub.  If it succeeds, it prints the system name on stdout, and
 # exits with 0.  Otherwise, it exits with 1.
 #
-# The plan is that this can be called by configure scripts if you
-# don't specify an explicit build system type.
+# You can get the latest version of this script from:
+# http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD

 me=`echo "$0" | sed -e 's,.*/,,'`

@@ -170,7 +170,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	    arm*|i386|m68k|ns32k|sh3*|sparc|vax)
 		eval $set_cc_for_build
 		if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
-			| grep __ELF__ >/dev/null
+			| grep -q __ELF__
 		then
 		    # Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
 		    # Return netbsd for either.  FIX?
@@ -333,6 +333,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
    sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
 	echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
+    i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
+	echo i386-pc-auroraux${UNAME_RELEASE}
+	exit ;;
    i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
 	eval $set_cc_for_build
 	SUN_ARCH="i386"
@@ -656,7 +659,7 @@ EOF
 	    # => hppa64-hp-hpux11.23

 	    if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) |
-		grep __LP64__ >/dev/null
+		grep -q __LP64__
 	    then
 		HP_ARCH="hppa2.0w"
 	    else
@@ -807,12 +810,12 @@ EOF
    i*:PW*:*)
 	echo ${UNAME_MACHINE}-pc-pw32
 	exit ;;
-    *:Interix*:[3456]*)
+    *:Interix*:*)
    	case ${UNAME_MACHINE} in
 	    x86)
 		echo i586-pc-interix${UNAME_RELEASE}
 		exit ;;
-	    EM64T | authenticamd | genuineintel)
+	    authenticamd | genuineintel | EM64T)
 		echo x86_64-unknown-interix${UNAME_RELEASE}
 		exit ;;
 	    IA64)
@@ -822,6 +825,9 @@ EOF
    [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
 	echo i${UNAME_MACHINE}-pc-mks
 	exit ;;
+    8664:Windows_NT:*)
+	echo x86_64-pc-mks
+	exit ;;
    i*:Windows_NT*:* | Pentium*:Windows_NT*:*)
 	# How do we know it's Interix rather than the generic POSIX subsystem?
 	# It also conflicts with pre-2.0 versions of AT&T UWIN. Should we
@@ -851,6 +857,20 @@ EOF
    i*86:Minix:*:*)
 	echo ${UNAME_MACHINE}-pc-minix
 	exit ;;
+    alpha:Linux:*:*)
+	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
+	  EV5)   UNAME_MACHINE=alphaev5 ;;
+	  EV56)  UNAME_MACHINE=alphaev56 ;;
+	  PCA56) UNAME_MACHINE=alphapca56 ;;
+	  PCA57) UNAME_MACHINE=alphapca56 ;;
+	  EV6)   UNAME_MACHINE=alphaev6 ;;
+	  EV67)  UNAME_MACHINE=alphaev67 ;;
+	  EV68*) UNAME_MACHINE=alphaev68 ;;
+        esac
+	objdump --private-headers /bin/sh | grep -q ld.so.1
+	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
+	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
+	exit ;;
    arm*:Linux:*:*)
 	eval $set_cc_for_build
 	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
@@ -873,6 +893,17 @@ EOF
    frv:Linux:*:*)
    	echo frv-unknown-linux-gnu
 	exit ;;
+    i*86:Linux:*:*)
+	LIBC=gnu
+	eval $set_cc_for_build
+	sed 's/^	//' << EOF >$dummy.c
+	#ifdef __dietlibc__
+	LIBC=dietlibc
+	#endif
+EOF
+	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
+	echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
+	exit ;;
    ia64:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
@@ -882,78 +913,34 @@ EOF
    m68*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
-    mips:Linux:*:*)
+    mips:Linux:*:* | mips64:Linux:*:*)
 	eval $set_cc_for_build
 	sed 's/^	//' << EOF >$dummy.c
 	#undef CPU
-	#undef mips
-	#undef mipsel
+	#undef ${UNAME_MACHINE}
+	#undef ${UNAME_MACHINE}el
 	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-	CPU=mipsel
+	CPU=${UNAME_MACHINE}el
 	#else
 	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-	CPU=mips
+	CPU=${UNAME_MACHINE}
 	#else
 	CPU=
 	#endif
 	#endif
 EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
-	    /^CPU/{
-		s: ::g
-		p
-	    }'`"
-	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
-	;;
-    mips64:Linux:*:*)
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#undef CPU
-	#undef mips64
-	#undef mips64el
-	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-	CPU=mips64el
-	#else
-	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-	CPU=mips64
-	#else
-	CPU=
-	#endif
-	#endif
-EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
-	    /^CPU/{
-		s: ::g
-		p
-	    }'`"
+	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
 	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
 	;;
    or32:Linux:*:*)
 	echo or32-unknown-linux-gnu
 	exit ;;
-    ppc:Linux:*:*)
-	echo powerpc-unknown-linux-gnu
-	exit ;;
-    ppc64:Linux:*:*)
-	echo powerpc64-unknown-linux-gnu
-	exit ;;
-    alpha:Linux:*:*)
-	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
-	  EV5)   UNAME_MACHINE=alphaev5 ;;
-	  EV56)  UNAME_MACHINE=alphaev56 ;;
-	  PCA56) UNAME_MACHINE=alphapca56 ;;
-	  PCA57) UNAME_MACHINE=alphapca56 ;;
-	  EV6)   UNAME_MACHINE=alphaev6 ;;
-	  EV67)  UNAME_MACHINE=alphaev67 ;;
-	  EV68*) UNAME_MACHINE=alphaev68 ;;
-        esac
-	objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null
-	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
-	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
-	exit ;;
    padre:Linux:*:*)
 	echo sparc-unknown-linux-gnu
 	exit ;;
+    parisc64:Linux:*:* | hppa64:Linux:*:*)
+	echo hppa64-unknown-linux-gnu
+	exit ;;
    parisc:Linux:*:* | hppa:Linux:*:*)
 	# Look for CPU level
 	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
@@ -962,8 +949,11 @@ EOF
 	  *)    echo hppa-unknown-linux-gnu ;;
 	esac
 	exit ;;
-    parisc64:Linux:*:* | hppa64:Linux:*:*)
-	echo hppa64-unknown-linux-gnu
+    ppc64:Linux:*:*)
+	echo powerpc64-unknown-linux-gnu
+	exit ;;
+    ppc:Linux:*:*)
+	echo powerpc-unknown-linux-gnu
 	exit ;;
    s390:Linux:*:* | s390x:Linux:*:*)
 	echo ${UNAME_MACHINE}-ibm-linux
@@ -986,66 +976,6 @@ EOF
    xtensa*:Linux:*:*)
    	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
-    i*86:Linux:*:*)
-	# The BFD linker knows what the default object file format is, so
-	# first see if it will tell us. cd to the root directory to prevent
-	# problems with other programs or directories called `ld' in the path.
-	# Set LC_ALL=C to ensure ld outputs messages in English.
-	ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \
-			 | sed -ne '/supported targets:/!d
-				    s/[ 	][ 	]*/ /g
-				    s/.*supported targets: *//
-				    s/ .*//
-				    p'`
-        case "$ld_supported_targets" in
-	  elf32-i386)
-		TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu"
-		;;
-	  a.out-i386-linux)
-		echo "${UNAME_MACHINE}-pc-linux-gnuaout"
-		exit ;;
-	  "")
-		# Either a pre-BFD a.out linker (linux-gnuoldld) or
-		# one that does not give us useful --help.
-		echo "${UNAME_MACHINE}-pc-linux-gnuoldld"
-		exit ;;
-	esac
-	# Determine whether the default compiler is a.out or elf
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#include <features.h>
-	#ifdef __ELF__
-	# ifdef __GLIBC__
-	#  if __GLIBC__ >= 2
-	LIBC=gnu
-	#  else
-	LIBC=gnulibc1
-	#  endif
-	# else
-	LIBC=gnulibc1
-	# endif
-	#else
-	#if defined(__INTEL_COMPILER) || defined(__PGI) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-	LIBC=gnu
-	#else
-	LIBC=gnuaout
-	#endif
-	#endif
-	#ifdef __dietlibc__
-	LIBC=dietlibc
-	#endif
-EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
-	    /^LIBC/{
-		s: ::g
-		p
-	    }'`"
-	test x"${LIBC}" != x && {
-		echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
-		exit
-	}
-	test x"${TENTATIVE}" != x && { echo "${TENTATIVE}"; exit; }
-	;;
    i*86:DYNIX/ptx:4*:*)
 	# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
 	# earlier versions are messed up and put the nodename in both
@@ -1074,7 +1004,7 @@ EOF
    i*86:syllable:*:*)
 	echo ${UNAME_MACHINE}-pc-syllable
 	exit ;;
-    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.0*:*)
+    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
 	echo i386-unknown-lynxos${UNAME_RELEASE}
 	exit ;;
    i*86:*DOS:*:*)
@@ -1182,7 +1112,7 @@ EOF
    rs6000:LynxOS:2.*:*)
 	echo rs6000-unknown-lynxos${UNAME_RELEASE}
 	exit ;;
-    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.0*:*)
+    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
 	echo powerpc-unknown-lynxos${UNAME_RELEASE}
 	exit ;;
    SM[BE]S:UNIX_SV:*:*)
@@ -1275,6 +1205,16 @@ EOF
    *:Darwin:*:*)
 	UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
 	case $UNAME_PROCESSOR in
+	    i386)
+		eval $set_cc_for_build
+		if [ "$CC_FOR_BUILD" != 'no_compiler_found' ]; then
+		  if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
+		      (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | \
+		      grep IS_64BIT_ARCH >/dev/null
+		  then
+		      UNAME_PROCESSOR="x86_64"
+		  fi
+		fi ;;
 	    unknown) UNAME_PROCESSOR=powerpc ;;
 	esac
 	echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}
--- a/config.sub
+++ b/config.sub
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Configuration validation subroutine script.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
 #   Free Software Foundation, Inc.

-timestamp='2009-04-17'
+timestamp='2009-11-20'

 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -32,13 +32,16 @@ timestamp='2009-04-17'


 # Please send patches to <config-patches@gnu.org>.  Submit a context
-# diff and a properly formatted ChangeLog entry.
+# diff and a properly formatted GNU ChangeLog entry.
 #
 # Configuration subroutine to validate and canonicalize a configuration type.
 # Supply the specified configuration type as an argument.
 # If it is invalid, we print an error message on stderr and exit with code 1.
 # Otherwise, we print the canonical config type on stdout and succeed.

+# You can get the latest version of this script from:
+# http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD
+
 # This file is supposed to be the same for all GNU packages
 # and recognize all the CPU types, system types and aliases
 # that are meaningful with *any* GNU software.
@@ -149,10 +152,13 @@ case $os in
 	-convergent* | -ncr* | -news | -32* | -3600* | -3100* | -hitachi* |\
 	-c[123]* | -convex* | -sun | -crds | -omron* | -dg | -ultra | -tti* | \
 	-harris | -dolphin | -highlevel | -gould | -cbm | -ns | -masscomp | \
-	-apple | -axis | -knuth | -cray)
+	-apple | -axis | -knuth | -cray | -microblaze)
 		os=
 		basic_machine=$1
 		;;
+        -bluegene*)
+	        os=-cnk
+		;;
 	-sim | -cisco | -oki | -wec | -winbond)
 		os=
 		basic_machine=$1
@@ -281,6 +287,7 @@ case $basic_machine in
 	| pdp10 | pdp11 | pj | pjl \
 	| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
 	| pyramid \
+	| rx \
 	| score \
 	| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
 	| sh64 | sh64le \
@@ -288,13 +295,14 @@ case $basic_machine in
 	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
 	| spu | strongarm \
 	| tahoe | thumb | tic4x | tic80 | tron \
+	| ubicom32 \
 	| v850 | v850e \
 	| we32k \
 	| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
 	| z8k | z80)
 		basic_machine=$basic_machine-unknown
 		;;
-	m6811 | m68hc11 | m6812 | m68hc12)
+	m6811 | m68hc11 | m6812 | m68hc12 | picochip)
 		# Motorola 68HC11/12.
 		basic_machine=$basic_machine-unknown
 		os=-none
@@ -337,7 +345,7 @@ case $basic_machine in
 	| lm32-* \
 	| m32c-* | m32r-* | m32rle-* \
 	| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
-	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
+	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* | microblaze-* \
 	| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
 	| mips16-* \
 	| mips64-* | mips64el-* \
@@ -365,7 +373,7 @@ case $basic_machine in
 	| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
 	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* | ppcbe-* \
 	| pyramid-* \
-	| romp-* | rs6000-* \
+	| romp-* | rs6000-* | rx-* \
 	| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
 	| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
 	| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
@@ -374,6 +382,7 @@ case $basic_machine in
 	| tahoe-* | thumb-* \
 	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
 	| tron-* \
+	| ubicom32-* \
 	| v850-* | v850e-* | vax-* \
 	| we32k-* \
 	| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
@@ -467,6 +476,10 @@ case $basic_machine in
 		basic_machine=bfin-`echo $basic_machine | sed 's/^[^-]*-//'`
 		os=-linux
 		;;
+	bluegene*)
+		basic_machine=powerpc-ibm
+		os=-cnk
+		;;
 	c90)
 		basic_machine=c90-cray
 		os=-unicos
@@ -719,6 +732,9 @@ case $basic_machine in
 		basic_machine=ns32k-utek
 		os=-sysv
 		;;
+        microblaze)
+		basic_machine=microblaze-xilinx
+		;;
 	mingw32)
 		basic_machine=i386-pc
 		os=-mingw32
@@ -1240,6 +1256,9 @@ case $os in
        # First match some system type aliases
        # that might get confused with valid system types.
 	# -solaris* is a basic system type, with this one exception.
+        -auroraux)
+	        os=-auroraux
+		;;
 	-solaris1 | -solaris1.*)
 		os=`echo $os | sed -e 's|solaris1|sunos4|'`
 		;;
@@ -1260,9 +1279,9 @@ case $os in
 	# Each alternative MUST END IN A *, to match a version number.
 	# -sysv* is not here because it comes later, after sysvr4.
 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
-	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
-	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
-	      | -kopensolaris* \
+	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
+	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
+	      | -sym* | -kopensolaris* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
 	      | -aos* | -aros* \
 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
@@ -1283,7 +1302,7 @@ case $os in
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
-	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
@@ -1613,7 +1632,7 @@ case $basic_machine in
 			-sunos*)
 				vendor=sun
 				;;
-			-aix*)
+			-cnk*|-aix*)
 				vendor=ibm
 				;;
 			-beos*)
--- a/3738
+++ b/3738
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)

 dnl Version number stuff here:

-AC_INIT([libpng], [1.5.0beta30], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.3beta01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE

-PNGLIB_VERSION=1.5.0beta30
+PNGLIB_VERSION=1.5.3beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=0
+PNGLIB_RELEASE=3

 dnl End of version number stuff

@@ -34,16 +34,38 @@ AC_CONFIG_SRCDIR([pngget.c])
 AM_CONFIG_HEADER(config.h)

 # Checks for programs.
+AC_LANG([C])
 AC_PROG_CC
 AC_PROG_LD
 AC_PROG_CPP
 AC_CHECK_TOOL(SED, sed, :)
 AC_CHECK_TOOL(AWK, awk, :)
-AC_LIBTOOL_WIN32_DLL
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
-AC_PROG_LIBTOOL
+LT_INIT([win32-dll])
+
+# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# does some input parsing.  We need strict ANSI-C style tokenization,
+# check this:
+AC_REQUIRE_CPP
+AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
+AC_TRY_CPP([1.5.0 16BIT],
+   [DFNCPP="$CPP"],
+   [DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      AC_TRY_CPP([1.5.0 16BIT],
+         [DFNCPP="$CPP"]
+         [break],,)
+   done
+   CPP="$sav_CPP"])
+if test -n "$DFNCPP"; then
+   AC_MSG_RESULT([$DFNCPP])
+   AC_SUBST(DFNCPP)
+else
+   AC_MSG_FAILURE([not found], 1)
+fi

 # Checks for header files.
 AC_HEADER_STDC
@@ -58,13 +80,30 @@ AC_STRUCT_TM
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc]))
 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )
-AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))
+AC_ARG_WITH(zlib-prefix,
+   AC_HELP_STRING([--with-zlib-prefix],
+                  [prefix that may have been used in installed zlib]),
+                  [ZPREFIX=${withval}],
+                  [ZPREFIX='z_'])
+AC_CHECK_LIB(z, zlibVersion, ,
+    AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, ,
+                 AC_ERROR([zlib not installed])))
+

 LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
 LIBPNG_DEFINES=$LIBPNG_DEFINES
 AC_SUBST(LIBPNG_DEFINES)

 AC_MSG_CHECKING([if libraries can be versioned])
+# Special case for PE/COFF platforms: ld reports
+# support for version-script, but doesn't actually
+# DO anything with it.
+case $host in
+*cygwin* | *mingw32* | *interix* )
+    have_ld_version_script=no
+    AC_MSG_RESULT(no)
+;;
+* )
 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
 if test "$GLD"; then
    have_ld_version_script=yes
@@ -74,6 +113,9 @@ else
    AC_MSG_RESULT(no)
    AC_MSG_WARN(*** You have not enabled versioned symbols.)
 fi
+;;
+esac
+
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

 if test "$have_ld_version_script" = "yes"; then
--- a/contrib/gregbook/COPYING
+++ b/contrib/gregbook/COPYING
@@ -1,12 +1,12 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

-			    Preamble
+                            Preamble

  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
@@ -56,7 +56,7 @@ patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.

-		    GNU GENERAL PUBLIC LICENSE
+                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
@@ -255,7 +255,7 @@ make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.

-			    NO WARRANTY
+                            NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
@@ -277,9 +277,9 @@ YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.

-		     END OF TERMS AND CONDITIONS
+                     END OF TERMS AND CONDITIONS

-	    How to Apply These Terms to Your New Programs
+            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
--- a/contrib/gregbook/README
+++ b/contrib/gregbook/README
@@ -63,9 +63,9 @@ BUILD INSTRUCTIONS

 - Prerequisites (in order of compilation):

-      - zlib		http://zlib.net/
-      - libpng		http://www.libpng.org/pub/png/libpng.html
-      - pngbook		http://www.libpng.org/pub/png/book/sources.html
+      - zlib            http://zlib.net/
+      - libpng          http://www.libpng.org/pub/png/libpng.html
+      - pngbook         http://www.libpng.org/pub/png/book/sources.html

     The pngbook demo programs are explicitly designed to demonstrate proper
     coding techniques for using the libpng reference library.  As a result,
@@ -165,19 +165,19 @@ RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
     rpng is a simple PNG viewer that can display transparent PNGs with a
     specified background color; for example,

-	rpng -bgcolor #ff0000 toucan.png
+        rpng -bgcolor \#ff0000 toucan.png

     would display the image with a red background.  rpng2 is a progressive
     viewer that simulates a web browser in some respects; it can display
     images against either a background color or a dynamically generated
     background image.  For example:

-	rpng2 -bgpat 16 toucan.png
+        rpng2 -bgpat 16 toucan.png

     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
     format (.pgm or .ppm) to PNG; for example,

-	wpng -time < toucan-notrans.ppm > toucan-notrans.png
+        wpng -time < toucan-notrans.ppm > toucan-notrans.png

     would convert the specified PPM file (using redirection) to PNG, auto-
     matically setting the PNG modification-time chunk.
--- a/contrib/gregbook/readpng.c
+++ b/contrib/gregbook/readpng.c
@@ -263,7 +263,8 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
        return NULL;
    }

-    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
+    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n",
+        *pChannels, rowbytes, height));


    /* set the individual row_pointers to point at the correct offsets */
--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -55,8 +55,10 @@


 #include <stdlib.h>     /* for exit() prototype */
+#include <setjmp.h>

-#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include <zlib.h>
+#include "png.h"        /* libpng header from the local directory */
 #include "readpng2.h"   /* typedefs, common macros, public prototypes */


@@ -66,6 +68,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr);
 static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
                                 png_uint_32 row_num, int pass);
 static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);



@@ -101,7 +104,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
    /* could also replace libpng warning-handler (final NULL), but no need: */

    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
-      NULL, NULL);
+      readpng2_error_handler, NULL);
    if (!png_ptr)
        return 4;   /* out of memory */

@@ -137,7 +140,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
         * version recognizes more chunks, add them to this list.  If a
         * future version of readpng2.c recognizes more chunks, delete them
         * from this list. */
-        static const png_byte chunks_to_ignore[] = {
+        static /* const */ png_byte chunks_to_ignore[] = {
             99,  72,  82,  77, '\0',  /* cHRM */
            104,  73,  83,  84, '\0',  /* hIST */
            105,  67,  67,  80, '\0',  /* iCCP */
@@ -215,7 +218,11 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
    mainprog_info  *mainprog_ptr;
    int  color_type, bit_depth;
    png_uint_32 width, height;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    double  gamma;
+#else
+    png_fixed_point gamma;
+#endif


    /* setjmp() doesn't make sense here, because we'd either have to exit(),
@@ -326,11 +333,19 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
     * "gamma" value for the entire display system, i.e., the product of
     * LUT_exponent and CRT_exponent. */

+#ifdef PNG_FLOATING_POINT_SUPPORTED
    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
    else
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
-
+#else
+    if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
+    else
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
+#endif

    /* we'll let libpng expand interlaced images, too */

@@ -450,3 +465,41 @@ void readpng2_cleanup(mainprog_info *mainprog_ptr)
    mainprog_ptr->png_ptr = NULL;
    mainprog_ptr->info_ptr = NULL;
 }
+
+
+
+
+
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "readpng2 libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -24,8 +24,6 @@
    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
-    - 2.02:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

@@ -87,7 +85,33 @@
 #include <string.h>
 #include <time.h>
 #include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
 #include <conio.h>      /* only for _getch() */
+#endif

 /* #define DEBUG  :  this enables the Trace() macros */

@@ -155,7 +179,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)

    filename = (char *)NULL;

-
+#ifndef __CYGWIN__
    /* First reenable console output, which normally goes to the bit bucket
     * for windowed apps.  Closing the console window will terminate the
     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
@@ -164,6 +188,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
+#endif


    /* Next set the default value for our display-system exponent, i.e.,
@@ -281,7 +306,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* print usage screen if any errors up to this point */

    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng_version_info();
@@ -295,11 +322,15 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+#ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen.\n"
+#endif
          "\n", PROGNAME, default_display_exponent);
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(1);
    }

@@ -335,18 +366,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)


    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
+#endif
    }


@@ -419,7 +456,12 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* wait for the user to tell us when to quit */

    printf(
-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
    fflush(stdout);

    while (GetMessage(&msg, NULL, 0, 0)) {
--- a/contrib/gregbook/rpng-x.c
+++ b/contrib/gregbook/rpng-x.c
@@ -26,8 +26,6 @@
    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
-    - 2.02:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

--- a/contrib/gregbook/rpng2-win.c
+++ b/contrib/gregbook/rpng2-win.c
@@ -32,9 +32,7 @@
    - 2.01:  fixed 64-bit typo in readpng2.c
    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
              unexpected-EOF and file-read-error cases
-    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options;
-             removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.
+    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options

  ---------------------------------------------------------------------------

@@ -98,7 +96,33 @@
 #include <time.h>
 #include <math.h>      /* only for PvdM background code */
 #include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
 #include <conio.h>     /* only for _getch() */
+#endif

 /* all for PvdM background code: */
 #ifndef PI
@@ -272,7 +296,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    filename = (char *)NULL;
    memset(&rpng2_info, 0, sizeof(mainprog_info));

-
+#ifndef __CYGWIN__
    /* Next reenable console output, which normally goes to the bit bucket
     * for windowed apps.  Closing the console window will terminate the
     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
@@ -281,7 +305,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
-
+#endif

    /* Set the default value for our display-system exponent, i.e., the
     * product of the CRT exponent and the exponent corresponding to
@@ -415,7 +439,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* print usage screen if any errors up to this point */

    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
@@ -434,16 +460,23 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+#ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen. ",
+#else
+          ,
+#endif
          PROGNAME,
-#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
+    !(defined(__CYGWIN__) || defined(__MINGW32__))
          (int)strlen(PROGNAME), " ",
 #endif
          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
        fflush(stderr);
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(1);
    }

@@ -480,18 +513,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)


    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
+#endif
        fflush(stderr);
    }

@@ -1134,7 +1173,12 @@ static void rpng2_win_finish_display()

    rpng2_info.state = kDone;
    printf(
-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
    fflush(stdout);
 }

--- a/contrib/gregbook/rpng2-x.c
+++ b/contrib/gregbook/rpng2-x.c
@@ -41,8 +41,6 @@
              unexpected-EOF and file-read-error cases; fixed Trace() cut-and-
              paste bugs
    - 2.03:  deleted runtime MMX-enabling/disabling and obsolete -mmx* options
-             removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

@@ -487,9 +485,6 @@ int main(int argc, char **argv)
          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
          "is displayed) to quit.\n"
          "\n", PROGNAME,
-#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
-          (int)strlen(PROGNAME), " ",
-#endif
          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat-1);
        exit(1);
    }
@@ -786,8 +781,9 @@ static void rpng2_x_init(void)
    if (rpng2_x_create_window()) {

        /* GRR TEMPORARY HACK:  this is fundamentally no different from cases
-         * above; libpng should longjmp() back to us when png_ptr goes away.
-         * If we/it segfault instead, seems like a libpng bug... */
+         * above; libpng should call our error handler to longjmp() back to us
+         * when png_ptr goes away.  If we/it segfault instead, seems like a
+         * libpng bug... */

        /* we're here via libpng callback, so if window fails, clean and bail */
        readpng2_cleanup(&rpng2_info);
--- a/contrib/gregbook/wpng.c
+++ b/contrib/gregbook/wpng.c
@@ -29,8 +29,6 @@
    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix
              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
    - 2.00:  dual-licensed (added GNU GPL)
-    - 2.01:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line
         dose not work!  In order to do something useful I needed to redirect
--- a/contrib/gregbook/writepng.c
+++ b/contrib/gregbook/writepng.c
@@ -60,6 +60,10 @@
 #include "writepng.h"   /* typedefs, common macros, public prototypes */


+/* local prototype */
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
+


 void writepng_version_info(void)
@@ -86,7 +90,7 @@ int writepng_init(mainprog_info *mainprog_ptr)
    /* could also replace libpng warning-handler (final NULL), but no need: */

    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
-      NULL, NULL);
+      writepng_error_handler, NULL);
    if (!png_ptr)
        return 4;   /* out of memory */

@@ -100,7 +104,8 @@ int writepng_init(mainprog_info *mainprog_ptr)
    /* setjmp() must be called in every function that calls a PNG-writing
     * libpng function, unless an alternate error handler was installed--
     * but compatible error handlers must either use longjmp() themselves
-     * (as in this program) or exit immediately, so here we go: */
+     * (as in this program) or some other method to return control to
+     * application code, so here we go: */

    if (setjmp(mainprog_ptr->jmpbuf)) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
@@ -355,3 +360,41 @@ void writepng_cleanup(mainprog_info *mainprog_ptr)
    if (png_ptr && info_ptr)
        png_destroy_write_struct(&png_ptr, &info_ptr);
 }
+
+
+
+
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "writepng libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "writepng severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
--- a/contrib/pngminim/decoder/makefile
+++ b/contrib/pngminim/decoder/makefile
@@ -4,11 +4,13 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
-STRIP=strip

 # If awk fails try
 # make AWK=nawk

+# If cpp fails try
+# make CPP=/lib/cpp
+
 RM=rm -f
 COPY=cp

@@ -87,7 +89,6 @@ all: pngm2pnm$(E)

 pngm2pnm$(E): $(OBJS)
 	$(LD) -o pngm2pnm$(E) $(OBJS)
-	$(STRIP) pngm2pnm$(E)

 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
--- a/contrib/pngminim/decoder/pngusr.dfa
+++ b/contrib/pngminim/decoder/pngusr.dfa
@@ -1,27 +1,39 @@
 # pngminim/decoder/pngusr.dfa
 #
-# Copyright (c) 2010 Glenn Randers-Pehrson
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h

 # First all the build options off:
+
 everything = off

 # All that is required is some read code. This example switches
 # on the sequential read code (see ../preader for a progressive
 # read example).
+
 option SEQUENTIAL_READ on

 # You must choose fixed or floating point arithmetic:
-option FLOATING_POINT on
-# option FIXED_POINT on
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+# option FLOATING_ARITHMETIC on
+
+option FLOATING_ARITHMETIC off

 # Your program will probably need other options.  The example
 # program here, pngm2pnm, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
+
 option SETJMP on
 option STDIO on
 option READ_EXPAND on
+option READ_16_TO_8 on
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -1,6 +1,6 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
- * Copyright (c) 2007, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,21 +12,12 @@
 #ifndef MINRDPNGCONF_H
 #define MINRDPNGCONF_H

-#ifdef NJET
-  /* No 16-bit support beyond reading with strip_16 */
-#endif
-
-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG decoder"
-#define PNG_USER_DLLFNAME_POSTFIX "mr"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */

 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
+
 #define PNG_NO_WARNINGS

 #endif /* MINRDPNGCONF_H */
--- a/contrib/pngminim/encoder/makefile
+++ b/contrib/pngminim/encoder/makefile
@@ -4,11 +4,13 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
-STRIP=strip

 # If awk fails try
 # make AWK=nawk

+# If cpp fails try
+# make CPP=/lib/cpp
+
 RM=rm -f
 COPY=cp

@@ -86,7 +88,6 @@ all: pnm2pngm$(E)

 pnm2pngm$(E): $(OBJS)
 	$(LD) -o pnm2pngm$(E) $(OBJS)
-	$(STRIP) pnm2pngm$(E)

 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
--- a/contrib/pngminim/encoder/pngusr.dfa
+++ b/contrib/pngminim/encoder/pngusr.dfa
@@ -1,24 +1,35 @@
 # pngminim/encoder/pngusr.dfa
 #
-# Copyright (c) 2010 Glenn Randers-Pehrson
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h

 # First all the build options off:
+
 everything = off

 # Switch on the write code - this makes a minimalist encoder
+
 option WRITE on

 # You must choose fixed or floating point arithmetic:
-option FLOATING_POINT on
-# option FIXED_POINT on
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+# option FLOATING_ARITHMETIC on
+
+option FLOATING_ARITHMETIC off

 # Your program will probably need other options.  The example
 # program here, pnm2pngm, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
+
 option SETJMP on
 option STDIO on
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -1,6 +1,6 @@
 /* minwrpngconf.h: headers to make a minimal png-write-only library
 *
- * Copyright (c) 2007, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,17 +12,12 @@
 #ifndef MINWRPNGCONF_H
 #define MINWRPNGCONF_H

-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG encoder"
-#define PNG_USER_DLLFNAME_POSTFIX "me"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */

 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
+
 #define PNG_NO_WARNINGS

 #endif /* MINWRPNGCONF_H */
--- a/contrib/pngminim/preader/makefile
+++ b/contrib/pngminim/preader/makefile
@@ -4,11 +4,13 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
-STRIP=strip

 # If awk fails try
 # make AWK=nawk

+# If cpp fails try
+# make CPP=/lib/cpp
+
 RM=rm -f
 COPY=cp

@@ -102,7 +104,6 @@ all: $(PROGDOCS) rpng2-x$(E)

 rpng2-x$(E): $(OBJS)
 	$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
-	$(STRIP) rpng2-x$(E)

 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
--- a/contrib/pngminim/preader/pngusr.dfa
+++ b/contrib/pngminim/preader/pngusr.dfa
@@ -1,25 +1,36 @@
 # pngminim/preader/pngusr.dfa
 #
-# Copyright (c) 2010 Glenn Randers-Pehrson
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h

 # First all the build options off:
+
 everything = off

 # Just switch on the progressive read code
+
 option PROGRESSIVE_READ on

-# You must choose fixed or floating point arithmetic:
-option FLOATING_POINT on
-# option FIXED_POINT on
+# You may choose fixed or floating point APIs:
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+
+option FLOATING_ARITHMETIC on
+# option FLOATING_ARITHMETIC off

 # Your program will probably need other options.  The example
 # program here, rpng2-x, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
+
 option SETJMP on
 option STDIO on
 option READ_bKGD on
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -1,6 +1,6 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
- * Copyright (c) 2009, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2009, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,17 +12,12 @@
 #ifndef MINPRDPNGCONF_H
 #define MINPRDPNGCONF_H

-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG progressive reader"
-#define PNG_USER_DLLFNAME_POSTFIX "mp"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */

 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
+
 #define PNG_NO_WARNINGS

 #endif /* MINPRDPNGCONF_H */
--- a/contrib/pngsuite/README
+++ b/contrib/pngsuite/README
@@ -1,10 +1,10 @@

 pngsuite
 --------
-(c) Willem van Schaik, 1999
+(c) Willem van Schaik, 1999, 2011

-Permission to use, copy, and distribute these images for any purpose and
-without fee is hereby granted.
+Permission to use, copy, modify, and distribute these images for any
+purpose and without fee is hereby granted.

 The 15 "bas*.png" images are part of the much larger PngSuite test-set of 
 images, available for developers of PNG supporting software. The 
@@ -52,7 +52,7 @@ can use them to test the proper functioning of PNG software.
    ftp0n3p08.png  8-bit paletted, opaque
    ftp1n3p08.png  8-bit paletted, no bKGD

-Here is the correct result of typing "pngtest -m *.png" in
+Here is the correct result of typing "pngtest -m bas*.png" in
 this directory:

 Testing basn0g01.png: PASS (524 zero samples)
--- a/example.c
+++ b/example.c
@@ -2,15 +2,15 @@
 #if 0 /* in case someone actually tries to compile this */

 /* example.c - an example of using libpng
- * Last changed in libpng 1.5.0 [June 22, 2010]
+ * Last changed in libpng 1.5.2 [March 31, 2011]
 * This file has been placed in the public domain by the authors.
- * Maintained 1998-2010 Glenn Randers-Pehrson
+ * Maintained 1998-2011 Glenn Randers-Pehrson
 * Maintained 1996, 1997 Andreas Dilger)
 * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */

 /* This is an example of how to use libpng to read and write PNG files.
- * The file libpng.txt is much more verbose then this.  If you have not
+ * The file libpng-manual.txt is much more verbose then this.  If you have not
 * read it, do so first.  This was designed to be a starting point of an
 * implementation.  This is not officially part of libpng, is hereby placed
 * in the public domain, and therefore does not require a copyright notice.
--- a/libpng-config.in
+++ b/libpng-config.in
@@ -104,8 +104,8 @@ while test $# -gt 0; do
        ;;

    --ldopts)
-    	echo ${ldopts}
-	;;
+        echo ${ldopts}
+        ;;

    --ldflags)
        echo ${ldopts} ${L_opts} ${R_opts} ${libs}
@@ -113,7 +113,7 @@ while test $# -gt 0; do

    --static)
        R_opts=""
-	libs=${all_libs}
+        libs=${all_libs}
        ;;

    *)
--- a/libpng-1.5.0beta30.txt
+++ b/libpng-1.5.0beta30.txt
--- a/libpng.3
+++ b/libpng.3
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,806 +1,28 @@
-.TH LIBPNGPF 3 "June 22, 2010"
+.TH LIBPNGPF 3 "April 1, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0beta30
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.3beta01
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

 \fI\fB

-\fBvoid png_64bit_product (long \fP\fIv1\fP\fB, long \fP\fIv2\fP\fB, unsigned long \fI*hi_product,
+\fBAs of libpng version \fP\fI1.5.1\fP\fB, this section is no longer \fP\fImaintained\fP\fB, now \fIthat

-\fBunsigned long \fI*lo_product\fP\fB);\fP
+\fBthe private function prototypes are hidden in pngpriv.h and not \fIaccessible

-\fI\fB
+\fBto applications. Look in pngpriv.h for the prototypes and a short \fIdescription

-\fBvoid png_build_gamma_table (png_structp \fP\fIpng_ptr\fP\fB, png_byte \fIbit_depth\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_build_grayscale_palette (int \fP\fIbit_depth\fP\fB, png_colorp \fIpalette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_calculate_crc (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIptr\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_check_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIint_white_x\fP\fB, png_fixed_point \fP\fIint_white_y\fP\fB, png_fixed_point \fP\fIint_red_x\fP\fB, png_fixed_point \fP\fIint_red_y\fP\fB, png_fixed_point \fP\fIint_green_x\fP\fB, png_fixed_point \fP\fIint_green_y\fP\fB, png_fixed_point \fP\fIint_blue_x\fP\fB, png_fixed_point \fIint_blue_y\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_size_t png_check_keyword (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charpp \fInew_key\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_check_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIinterlace_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fIfilter_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fImask\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_correct_palette (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_crc_error (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_crc_finish (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIskip\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_crc_read (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuf\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_debug(int \fP\fIlevel\fP\fB, png_const_charp \fImessage\fP\fB);\fP
-
-\fI\fB
-
-\fBint png_debug1(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fIp1\fP\fB);\fP
-
-\fI\fB
-
-\fBint png_debug2(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fP\fIp1\fP\fB, \fIp2\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_background (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fP\fItrans_color\fP\fB, png_color_16p \fP\fIbackground\fP\fB, png_color_16p \fP\fIbackground_1\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_bytep \fP\fIgamma_from_1\fP\fB, png_bytep \fP\fIgamma_to_1\fP\fB, png_uint_16pp \fP\fIgamma_16\fP\fB, png_uint_16pp \fP\fIgamma_16_from_1\fP\fB, png_uint_16pp \fP\fIgamma_16_to_1\fP\fB, int \fIgamma_shift\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_do_expand (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fItrans_value\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_expand_palette (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fInum_trans\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_gamma (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_uint_16pp \fP\fIgamma_16_table\fP\fB, int \fIgamma_shift\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_pack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIbit_depth\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_quantize (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIpalette_lookup\fP\fB, png_bytep \fIquantize_lookup\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_read_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-
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-\fBvoid png_do_read_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fP\fIpass\fP\fB, png_uint_32 \fItransformations\fP\fB);\fP
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-\fBvoid png_do_read_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_read_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBint png_do_rgb_to_gray (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_shift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIbit_depth\fP\fB);\fP
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-\fBvoid png_do_strip_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
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-\fBvoid png_do_swap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_unpack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_unshift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIsig_bits\fP\fB);\fP
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-\fBvoid png_do_write_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fIpass\fP\fB);\fP
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-\fBvoid png_do_write_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_write_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_write_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid *png_far_to_near (png_structp png_ptr,png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
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-\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_IEND (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_iTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_info_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_process_IDAT_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
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-\fBvoid png_process_some_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_push_crc_skip (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_push_fill_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fBvoid png_push_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_push_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_push_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_push_have_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_push_have_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fBvoid png_push_have_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_push_process_row (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_push_read_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fBvoid png_push_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_read_IDAT (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_push_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_push_read_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_read_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_restore_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
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-\fBvoid png_push_save_buffer (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_infop \fIend_info_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_filter_row (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIprev_row\fP\fB, int \fIfilter\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_read_start_row (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBint png_set_text_2 (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_cHRM (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_write_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_write_destroy (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
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-\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fP\fIfilter_type\fP\fB, int \fIinterlace_type\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_iTXt (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcompression\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fIlang\fP\fB, png_charp \fP\fItranslated_key\fP\fB, png_charp \fItext\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_offset\fP\fB, png_uint_32 \fP\fIy_offset\fP\fB, int \fIunit_type\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_pixels_per_unit\fP\fB, png_uint_32 \fP\fIy_pixels_per_unit\fP\fB, int \fIunit_type\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_write_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_uint_32 \fInum_pal\fP\fB);\fP
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-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fP\fIsbit\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sCAL_s (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, png_charp \fP\fIwidth\fP\fB, png_charp \fIheight\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sRGB (png_structp \fP\fIpng_ptr\fP\fB, int \fIintent\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fItext_len\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, png_color_16p \fP\fIvalues\fP\fB, int \fP\fInumber\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fP\fItext_len\fP\fB, int \fIcompression\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoidpf png_zalloc (voidpf \fP\fIpng_ptr\fP\fB, uInt \fP\fIitems\fP\fB, uInt \fIsize\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_zfree (voidpf \fP\fIpng_ptr\fP\fB, voidpf \fIptr\fP\fB);\fP
-
-\fI\fB
+\fBof each \fIfunction.

 \fI\fB

 .SH DESCRIPTION
-The functions listed above are used privately by libpng
+The functions previously listed here are  used privately by libpng
 and are not recommended for use by applications.  They are
 not "exported" to applications using shared libraries.  They
 are listed alphabetically here as an aid to libpng maintainers.
-See png.h for more information on these functions.
+See pngpriv.h for more information on these functions.

 .SH SEE ALSO
 .BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
--- a/ltmain.sh
+++ b/ltmain.sh
--- a/162
+++ b/162
@@ -1,162 +0,0 @@
-#! /bin/sh
-# mkinstalldirs --- make directory hierarchy
-
-scriptversion=2009-04-28.21; # UTC
-
-# Original author: Noah Friedman <friedman@prep.ai.mit.edu>
-# Created: 1993-05-16
-# Public domain.
-#
-# This file is maintained in Automake, please report
-# bugs to <bug-automake@gnu.org> or send patches to
-# <automake-patches@gnu.org>.
-
-nl='
-'
-IFS=" ""	$nl"
-errstatus=0
-dirmode=
-
-usage="\
-Usage: mkinstalldirs [-h] [--help] [--version] [-m MODE] DIR ...
-
-Create each directory DIR (with mode MODE, if specified), including all
-leading file name components.
-
-Report bugs to <bug-automake@gnu.org>."
-
-# process command line arguments
-while test $# -gt 0 ; do
-  case $1 in
-    -h | --help | --h*)         # -h for help
-      echo "$usage"
-      exit $?
-      ;;
-    -m)                         # -m PERM arg
-      shift
-      test $# -eq 0 && { echo "$usage" 1>&2; exit 1; }
-      dirmode=$1
-      shift
-      ;;
-    --version)
-      echo "$0 $scriptversion"
-      exit $?
-      ;;
-    --)                         # stop option processing
-      shift
-      break
-      ;;
-    -*)                         # unknown option
-      echo "$usage" 1>&2
-      exit 1
-      ;;
-    *)                          # first non-opt arg
-      break
-      ;;
-  esac
-done
-
-for file
-do
-  if test -d "$file"; then
-    shift
-  else
-    break
-  fi
-done
-
-case $# in
-  0) exit 0 ;;
-esac
-
-# Solaris 8's mkdir -p isn't thread-safe.  If you mkdir -p a/b and
-# mkdir -p a/c at the same time, both will detect that a is missing,
-# one will create a, then the other will try to create a and die with
-# a "File exists" error.  This is a problem when calling mkinstalldirs
-# from a parallel make.  We use --version in the probe to restrict
-# ourselves to GNU mkdir, which is thread-safe.
-case $dirmode in
-  '')
-    if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then
-      echo "mkdir -p -- $*"
-      exec mkdir -p -- "$@"
-    else
-      # On NextStep and OpenStep, the `mkdir' command does not
-      # recognize any option.  It will interpret all options as
-      # directories to create, and then abort because `.' already
-      # exists.
-      test -d ./-p && rmdir ./-p
-      test -d ./--version && rmdir ./--version
-    fi
-    ;;
-  *)
-    if mkdir -m "$dirmode" -p --version . >/dev/null 2>&1 &&
-       test ! -d ./--version; then
-      echo "mkdir -m $dirmode -p -- $*"
-      exec mkdir -m "$dirmode" -p -- "$@"
-    else
-      # Clean up after NextStep and OpenStep mkdir.
-      for d in ./-m ./-p ./--version "./$dirmode";
-      do
-        test -d $d && rmdir $d
-      done
-    fi
-    ;;
-esac
-
-for file
-do
-  case $file in
-    /*) pathcomp=/ ;;
-    *)  pathcomp= ;;
-  esac
-  oIFS=$IFS
-  IFS=/
-  set fnord $file
-  shift
-  IFS=$oIFS
-
-  for d
-  do
-    test "x$d" = x && continue
-
-    pathcomp=$pathcomp$d
-    case $pathcomp in
-      -*) pathcomp=./$pathcomp ;;
-    esac
-
-    if test ! -d "$pathcomp"; then
-      echo "mkdir $pathcomp"
-
-      mkdir "$pathcomp" || lasterr=$?
-
-      if test ! -d "$pathcomp"; then
-	errstatus=$lasterr
-      else
-	if test ! -z "$dirmode"; then
-	  echo "chmod $dirmode $pathcomp"
-	  lasterr=
-	  chmod "$dirmode" "$pathcomp" || lasterr=$?
-
-	  if test ! -z "$lasterr"; then
-	    errstatus=$lasterr
-	  fi
-	fi
-      fi
-    fi
-
-    pathcomp=$pathcomp/
-  done
-done
-
-exit $errstatus
-
-# Local Variables:
-# mode: shell-script
-# sh-indentation: 2
-# eval: (add-hook 'write-file-hooks 'time-stamp)
-# time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-time-zone: "UTC"
-# time-stamp-end: "; # UTC"
-# End:
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "June 22, 2010"
+.TH PNG 5 "April 1, 2011"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
--- a/png.c
+++ b/png.c
--- a/png.h
+++ b/png.h
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,9 +1,9 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng version 1.5.0beta30 - June 22, 2010
+ * libpng version 1.5.3beta01 - March 31, 2011
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -22,20 +22,31 @@
 #ifndef PNGCONF_H
 #define PNGCONF_H

-/* Need the time information for converting tIME chunks, it
- * defines struct tm:
- */
-#ifdef PNG_CONVERT_tIME_SUPPORTED
-  /* "time.h" functions are not supported on WindowsCE */
-#  include <time.h>
-#endif
-
+#ifndef PNG_BUILDING_SYMBOL_TABLE
 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
 * definition file for  machine specific limits, this may impact the
 * correctness of the definitons below (see uses of INT_MAX).
 */
-#ifndef PNG_NO_LIMITS_H
-#  include <limits.h>
+#  ifndef PNG_NO_LIMITS_H
+#    include <limits.h>
+#  endif
+
+/* For the memory copy APIs (i.e. the standard definitions of these),
+ * because this file defines png_memcpy and so on the base APIs must
+ * be defined here.
+ */
+#  ifdef BSD
+#    include <strings.h>
+#  else
+#    include <string.h>
+#  endif
+
+/* For png_FILE_p - this provides the standard definition of a
+ * FILE
+ */
+#  ifdef PNG_STDIO_SUPPORTED
+#    include <stdio.h>
+#  endif
 #endif

 /* This controls optimization of the reading of 16 and 32 bit values
@@ -60,7 +71,8 @@
 * below) but still have compiler specific implementations, others
 * may be changed on a per-file basis when compiling against libpng.
 */
-/* This macro protects us against machines that don't have function
+
+/* The PNGARG macro protects us against machines that don't have function
 * prototypes (ie K&R style headers).  If your compiler does not handle
 * function prototypes, define this macro and use the included ansi2knr.
 * I've always been able to use _NO_PROTO as the indicator, but you may
@@ -141,7 +153,7 @@
 * linked one.  For this reason the application must tell us by setting
 * the magic flag PNG_USE_DLL to turn on the special processing before
 * it includes png.h.
- * 
+ *
 * Four additional macros are used to make this happen:
 *
 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
@@ -171,9 +183,20 @@
      defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\
    ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
      defined(_M_X64) || defined(_M_IA64) )
-  /* Windows system (DOS doesn't support DLLs) running on x86/x64.
-   * Includes builds under Cygwin or MinGW.
+  /* Windows system (DOS doesn't support DLLs) running on x86/x64.  Includes
+   * builds under Cygwin or MinGW.  Also includes Watcom builds but these need
+   * special treatment because they are not compatible with GCC or Visual C
+   * because of different calling conventions.
   */
+#  if PNG_API_RULE == 2
+    /* If this line results in an error, either because __watcall is not
+     * understood or because of a redefine just below you cannot use *this*
+     * build of the library with the compiler you are using.  *This* build was
+     * build using Watcom and applications must also be built using Watcom!
+     */
+#    define PNGCAPI __watcall
+#  endif
+
 #  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
 #    define PNGCAPI __cdecl
 #    if PNG_API_RULE == 1
@@ -242,9 +265,9 @@
 #  ifdef PNGLIB_BUILD
    /* Building the library */
 #    if (defined(DLL_EXPORT)/*from libtool*/ ||\
-	defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\
-	defined(_USRDLL) ||\
-	defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)
+        defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\
+        defined(_USRDLL) ||\
+        defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)
      /* Building a DLL. */
 #      define PNG_IMPEXP PNG_DLL_EXPORT
 #    endif /* DLL */
@@ -261,22 +284,47 @@
 #  endif
 #endif

+/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
+ * 'attributes' as a storage class - the attributes go at the start of the
+ * function definition, and attributes are always appended regardless of the
+ * compiler.  This considerably simplifies these macros but may cause problems
+ * if any compilers both need function attributes and fail to handle them as
+ * a storage class (this is unlikely.)
+ */
+#ifndef PNG_FUNCTION
+#  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
+#endif
+
 #ifndef PNG_EXPORT_TYPE
 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 #endif
-#ifndef PNG_EXPORT
-#  define PNG_EXPORT(type, name, args, attributes, ordinal)\
-     PNG_EXPORT_TYPE(type) (PNGAPI name) PNGARG(args) attributes
+
+   /* The ordinal value is only relevant when preprocessing png.h for symbol
+    * table entries, so we discard it here.  See the .dfn files in the
+    * scripts directory.
+    */
+#ifndef PNG_EXPORTA
+
+#  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
+      PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
+        extern attributes)
 #endif

+/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
+ * so make something non-empty to satisfy the requirement:
+ */
+#define PNG_EMPTY /*empty list*/
+
+#define PNG_EXPORT(ordinal, type, name, args)\
+   PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
+
 /* Use PNG_REMOVED to comment out a removed interface. */
 #ifndef PNG_REMOVED
-#  define PNG_REMOVED(type, name, args, attributes, ordinal)
+#  define PNG_REMOVED(ordinal, type, name, args, attributes)
 #endif

 #ifndef PNG_CALLBACK
-#  define PNG_CALLBACK(type, name, args, attributes)\
-   type (PNGCBAPI name) PNGARG(args) attributes
+#  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 #endif

 /* Support for compiler specific function attributes.  These are used
@@ -298,13 +346,30 @@
   * functions in png.h will generate compiler warnings.  Added at libpng
   * version 1.2.41.
   */
-#  ifdef __GNUC__
+#  if defined(__GNUC__)
 #    ifndef PNG_USE_RESULT
 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 #    endif
 #    ifndef PNG_NORETURN
 #      define PNG_NORETURN   __attribute__((__noreturn__))
 #    endif
+#    ifndef PNG_PTR_NORETURN
+       /* It's not enough to have the compiler be the correct compiler at
+        * this point - it's necessary for the library (which defines
+        * the type of the library longjmp) to also be the GNU library.
+        * This is because many systems use the GNU compiler with a
+        * non-GNU libc implementation.  Min/GW headers are also compatible
+        * with GCC as well as uclibc, so it seems best to exclude known
+        * problem libcs here rather than just including known libcs.
+        *
+        * NOTE: this relies on the only use of PNG_PTR_NORETURN being with
+        * the system longjmp.  If the same type is used elsewhere then this
+        * will need to be changed.
+        */
+#      if !defined(__CYGWIN__)
+#         define PNG_PTR_NORETURN   __attribute__((__noreturn__))
+#      endif
+#    endif
 #    ifndef PNG_ALLOCATED
 #      define PNG_ALLOCATED  __attribute__((__malloc__))
 #    endif
@@ -328,9 +393,40 @@
 #          define PNG_PRIVATE \
            __attribute__((__deprecated__))
 #        endif
-#      endif /* PNG_PRIVATE */
+#      endif
 #    endif /* PNGLIB_BUILD */
 #  endif /* __GNUC__ */
+
+#  if defined(_MSC_VER)  && (_MSC_VER >= 1300)
+#    ifndef PNG_USE_RESULT
+#      define PNG_USE_RESULT /* not supported */
+#    endif
+#    ifndef PNG_NORETURN
+#      define PNG_NORETURN   __declspec(noreturn)
+#    endif
+#    ifndef PNG_PTR_NORETURN
+#      define PNG_PTR_NORETURN /* not supported */
+#    endif
+#    ifndef PNG_ALLOCATED
+#      define PNG_ALLOCATED __declspec(restrict)
+#    endif
+
+    /* This specifically protects structure members that should only be
+     * accessed from within the library, therefore should be empty during
+     * a library build.
+     */
+#    ifndef PNGLIB_BUILD
+#      ifndef PNG_DEPRECATED
+#        define PNG_DEPRECATED __declspec(deprecated)
+#      endif
+#      ifndef PNG_DEPSTRUCT
+#        define PNG_DEPSTRUCT  __declspec(deprecated)
+#      endif
+#      ifndef PNG_PRIVATE
+#        define PNG_PRIVATE __declspec(deprecated)
+#      endif
+#    endif /* PNGLIB_BUILD */
+#  endif /* _MSC_VER */
 #endif /* PNG_PEDANTIC_WARNINGS */

 #ifndef PNG_DEPRECATED
@@ -342,6 +438,9 @@
 #ifndef PNG_NORETURN
 #  define PNG_NORETURN    /* This function does not return */
 #endif
+#ifndef PNG_PTR_NORETURN
+#  define PNG_PTR_NORETURN /* This function does not return */
+#endif
 #ifndef PNG_ALLOCATED
 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 #endif
@@ -351,6 +450,22 @@
 #ifndef PNG_PRIVATE
 #  define PNG_PRIVATE     /* This is a private libpng function */
 #endif
+#ifndef PNG_FP_EXPORT     /* A floating point API. */
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+#     define PNG_FP_EXPORT(ordinal, type, name, args)\
+         PNG_EXPORT(ordinal, type, name, args)
+#  else                   /* No floating point APIs */
+#     define PNG_FP_EXPORT(ordinal, type, name, args)
+#  endif
+#endif
+#ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+#     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
+         PNG_EXPORT(ordinal, type, name, args)
+#  else                   /* No fixed point APIs */
+#     define PNG_FIXED_EXPORT(ordinal, type, name, args)
+#  endif
+#endif

 /* The following uses const char * instead of char * for error
 * and warning message functions, so some compilers won't complain.
@@ -391,7 +506,7 @@ typedef unsigned int png_size_t;
 #else
 typedef size_t png_size_t;
 #endif
-#define png_sizeof(x) sizeof(x)
+#define png_sizeof(x) (sizeof (x))

 /* The following is needed for medium model support.  It cannot be in the
 * pngpriv.h header.  Needs modification for other compilers besides
@@ -454,27 +569,37 @@ typedef size_t png_size_t;
 #endif

 /* Typedef for floating-point numbers that are converted
- * to fixed-point with a multiple of 100,000, e.g., int_gamma
+ * to fixed-point with a multiple of 100,000, e.g., gamma
 */
 typedef png_int_32 png_fixed_point;

 /* Add typedefs for pointers */
-typedef void            FAR * png_voidp;
-typedef png_byte        FAR * png_bytep;
-typedef png_uint_32     FAR * png_uint_32p;
-typedef png_int_32      FAR * png_int_32p;
-typedef png_uint_16     FAR * png_uint_16p;
-typedef png_int_16      FAR * png_int_16p;
-typedef PNG_CONST char  FAR * png_const_charp;
-typedef char            FAR * png_charp;
-typedef png_fixed_point FAR * png_fixed_point_p;
+typedef void                      FAR * png_voidp;
+typedef PNG_CONST void            FAR * png_const_voidp;
+typedef png_byte                  FAR * png_bytep;
+typedef PNG_CONST png_byte        FAR * png_const_bytep;
+typedef png_uint_32               FAR * png_uint_32p;
+typedef PNG_CONST png_uint_32     FAR * png_const_uint_32p;
+typedef png_int_32                FAR * png_int_32p;
+typedef PNG_CONST png_int_32      FAR * png_const_int_32p;
+typedef png_uint_16               FAR * png_uint_16p;
+typedef PNG_CONST png_uint_16     FAR * png_const_uint_16p;
+typedef png_int_16                FAR * png_int_16p;
+typedef PNG_CONST png_int_16      FAR * png_const_int_16p;
+typedef char                      FAR * png_charp;
+typedef PNG_CONST char            FAR * png_const_charp;
+typedef png_fixed_point           FAR * png_fixed_point_p;
+typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;
+typedef png_size_t                FAR * png_size_tp;
+typedef PNG_CONST png_size_t      FAR * png_const_size_tp;

 #ifdef PNG_STDIO_SUPPORTED
 typedef FILE            * png_FILE_p;
 #endif

 #ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double          FAR * png_doublep;
+typedef double           FAR * png_doublep;
+typedef PNG_CONST double FAR * png_const_doublep;
 #endif

 /* Pointers to pointers; i.e. arrays */
@@ -493,80 +618,6 @@ typedef double          FAR * FAR * png_doublepp;
 /* Pointers to pointers to pointers; i.e., pointer to array */
 typedef char            FAR * FAR * FAR * png_charppp;

-#define PNG_USE_LOCAL_ARRAYS /* Not used in libpng, defined for legacy apps */
-
-/* Users may want to use these so they are not private.  Any library
- * functions that are passed far data must be model-independent.
- */
-
-/* Memory model/platform independent fns */
-#ifndef PNG_ABORT
-#  ifdef _WINDOWS_
-#    define PNG_ABORT() ExitProcess(0)
-#  else
-#    define PNG_ABORT() abort()
-#  endif
-#endif
-
-#ifdef USE_FAR_KEYWORD
-/* Use this to make far-to-near assignments */
-#  define CHECK   1
-#  define NOCHECK 0
-#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
-#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
-#  define png_strcpy  _fstrcpy
-#  define png_strncpy _fstrncpy   /* Added to v 1.2.6 */
-#  define png_strlen  _fstrlen
-#  define png_memcmp  _fmemcmp    /* SJT: added */
-#  define png_memcpy  _fmemcpy
-#  define png_memset  _fmemset
-#  define png_sprintf sprintf
-#else
-#  ifdef _WINDOWS_  /* Favor Windows over C runtime fns */
-#    define CVT_PTR(ptr)         (ptr)
-#    define CVT_PTR_NOCHECK(ptr) (ptr)
-#    define png_strcpy  lstrcpyA
-#    define png_strncpy lstrcpynA
-#    define png_strlen  lstrlenA
-#    define png_memcmp  memcmp
-#    define png_memcpy  CopyMemory
-#    define png_memset  memset
-#    define png_sprintf wsprintfA
-#  else
-#    define CVT_PTR(ptr)         (ptr)
-#    define CVT_PTR_NOCHECK(ptr) (ptr)
-#    define png_strcpy  strcpy
-#    define png_strncpy strncpy     /* Added to v 1.2.6 */
-#    define png_strlen  strlen
-#    define png_memcmp  memcmp      /* SJT: added */
-#    define png_memcpy  memcpy
-#    define png_memset  memset
-#    define png_sprintf sprintf
-#    ifndef PNG_NO_SNPRINTF
-#      ifdef _MSC_VER
-#        define png_snprintf _snprintf   /* Added to v 1.2.19 */
-#        define png_snprintf2 _snprintf
-#        define png_snprintf6 _snprintf
-#      else
-#        define png_snprintf snprintf   /* Added to v 1.2.19 */
-#        define png_snprintf2 snprintf
-#        define png_snprintf6 snprintf
-#      endif
-#    else
-      /* You don't have or don't want to use snprintf().  Caution: Using
-       * sprintf instead of snprintf exposes your application to accidental
-       * or malevolent buffer overflows.  If you don't have snprintf()
-       * as a general rule you should provide one (you can get one from
-       * Portable OpenSSH).
-       */
-#      define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
-#      define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
-#      define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
-          sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
-#    endif
-#  endif
-#endif
-
 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
 * and no smaller than png_uint_32.  Casts from png_size_t or png_uint_32
 * to png_alloc_size_t are not necessary; in fact, it is recommended
@@ -577,26 +628,22 @@ typedef char            FAR * FAR * FAR * png_charppp;
 * to encounter practical situations that require such conversions.
 */
 #if defined(__TURBOC__) && !defined(__FLAT__)
-#  define png_mem_alloc farmalloc
-#  define png_mem_free  farfree
   typedef unsigned long png_alloc_size_t;
 #else
 #  if defined(_MSC_VER) && defined(MAXSEG_64K)
-#    define png_mem_alloc(s) halloc(s, 1)
-#    define png_mem_free     hfree
     typedef unsigned long    png_alloc_size_t;
 #  else
-#    if defined(_WINDOWS_) && (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
-#      define png_mem_alloc(s) HeapAlloc(GetProcessHeap(), 0, s)
-#      define png_mem_free(p)  HeapFree(GetProcessHeap(), 0, p)
-       typedef DWORD            png_alloc_size_t;
+     /* This is an attempt to detect an old Windows system where (int) is
+      * actually 16 bits, in that case png_malloc must have an argument with a
+      * bigger size to accomodate the requirements of the library.
+      */
+#    if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
+        (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
+       typedef DWORD         png_alloc_size_t;
 #    else
-#      define png_mem_alloc malloc
-#      define png_mem_free  free
       typedef png_size_t    png_alloc_size_t;
 #    endif
 #  endif
 #endif
-/* End of memory model/platform independent support */

 #endif /* PNGCONF_H */
--- a/pngdebug.h
+++ b/pngdebug.h
@@ -1,11 +1,11 @@

 /* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
- * Last changed in libpng version 1.5.0 - June 22, 2010
+ * Last changed in libpng 1.5.0 [January 6, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -26,7 +26,7 @@
 *
 *   level: level of detail of message, starting at 0.  A level 'n'
 *          message is preceded by 'n' tab characters (not implemented
- *          on Microsoft compilers unless PNG_DEBUG_FILE is also 
+ *          on Microsoft compilers unless PNG_DEBUG_FILE is also
 *          defined, to allow debug DLL compilation with no standard IO).
 *   message: a printf(3) style text string.  A trailing '\n' is added
 *            to the message.
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,8 +1,8 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.1 [February 3, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -20,13 +20,13 @@

 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

-static void /* PRIVATE */
-png_default_error PNGARG((png_structp png_ptr,
-    png_const_charp error_message)) PNG_NORETURN;
+static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr,
+    png_const_charp error_message)),PNG_NORETURN);
+
 #ifdef PNG_WARNINGS_SUPPORTED
 static void /* PRIVATE */
 png_default_warning PNGARG((png_structp png_ptr,
-  png_const_charp warning_message));
+   png_const_charp warning_message));
 #endif /* PNG_WARNINGS_SUPPORTED */

 /* This function is called whenever there is a fatal error.  This function
@@ -35,8 +35,8 @@ png_default_warning PNGARG((png_structp png_ptr,
 * to replace the error function at run-time.
 */
 #ifdef PNG_ERROR_TEXT_SUPPORTED
-void PNGAPI
-png_error(png_structp png_ptr, png_const_charp error_message)
+PNG_FUNCTION(void,PNGAPI
+png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN)
 {
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
   char msg[16];
@@ -86,8 +86,8 @@ png_error(png_structp png_ptr, png_const_charp error_message)
   png_default_error(png_ptr, error_message);
 }
 #else
-void PNGAPI
-png_err(png_structp png_ptr)
+PNG_FUNCTION(void,PNGAPI
+png_err,(png_structp png_ptr),PNG_NORETURN)
 {
   if (png_ptr != NULL && png_ptr->error_fn != NULL)
      (*(png_ptr->error_fn))(png_ptr, '\0');
@@ -192,8 +192,9 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
 #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */

 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
-void PNGAPI
-png_chunk_error(png_structp png_ptr, png_const_charp error_message)
+PNG_FUNCTION(void,PNGAPI
+png_chunk_error,(png_structp png_ptr, png_const_charp error_message),
+   PNG_NORETURN)
 {
   char msg[18+PNG_MAX_ERROR_TEXT];
   if (png_ptr == NULL)
@@ -237,6 +238,28 @@ png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message)
 #endif
 #endif /* PNG_READ_SUPPORTED */

+#ifdef PNG_ERROR_TEXT_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_FUNCTION(void,
+png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN)
+{
+#  define fixed_message "fixed point overflow in "
+#  define fixed_message_ln ((sizeof fixed_message)-1)
+   int  iin;
+   char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
+   png_memcpy(msg, fixed_message, fixed_message_ln);
+   iin = 0;
+   if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
+   {
+      msg[fixed_message_ln + iin] = name[iin];
+      ++iin;
+   }
+   msg[fixed_message_ln + iin] = 0;
+   png_error(png_ptr, msg);
+}
+#endif
+#endif
+
 #ifdef PNG_SETJMP_SUPPORTED
 /* This API only exists if ANSI-C style error handling is used,
 * otherwise it is necessary for png_default_error to be overridden.
@@ -258,8 +281,9 @@ png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn,
 * function is used by default, or if the program supplies NULL for the
 * error function pointer in png_set_error_fn().
 */
-static void /* PRIVATE */
-png_default_error(png_structp png_ptr, png_const_charp error_message)
+static PNG_FUNCTION(void /* PRIVATE */,
+png_default_error,(png_structp png_ptr, png_const_charp error_message),
+   PNG_NORETURN)
 {
 #ifdef PNG_CONSOLE_IO_SUPPORTED
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
@@ -297,14 +321,14 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
      fprintf(stderr, PNG_STRING_NEWLINE);
   }
 #endif
-   png_longjmp(png_ptr, 1);
 #ifndef PNG_CONSOLE_IO_SUPPORTED
-   error_message = error_message; /* Make compiler happy */
+   PNG_UNUSED(error_message) /* Make compiler happy */
 #endif
+   png_longjmp(png_ptr, 1);
 }

-void PNGAPI
-png_longjmp(png_structp png_ptr, int val)
+PNG_FUNCTION(void,PNGAPI
+png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN)
 {
 #ifdef PNG_SETJMP_SUPPORTED
   if (png_ptr && png_ptr->longjmp_fn)
@@ -370,9 +394,9 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
      fprintf(stderr, PNG_STRING_NEWLINE);
   }
 #else
-   warning_message = warning_message; /* Make compiler happy */
+   PNG_UNUSED(warning_message) /* Make compiler happy */
 #endif
-   png_ptr = png_ptr; /* Make compiler happy */
+   PNG_UNUSED(png_ptr) /* Make compiler happy */
 }
 #endif /* PNG_WARNINGS_SUPPORTED */

@@ -399,7 +423,7 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_error_ptr(png_structp png_ptr)
+png_get_error_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return NULL;
--- a/pngget.c
+++ b/pngget.c
@@ -1,8 +1,8 @@

 /* pngget.c - retrieval of values from info struct
 *
- * Last changed in libpng 1.4.1 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.1 [February 3, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -17,41 +17,39 @@
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

 png_uint_32 PNGAPI
-png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
+png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_32 flag)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->valid & flag);

-   else
-      return(0);
+   return(0);
 }

 png_size_t PNGAPI
-png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
+png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->rowbytes);

-   else
-      return(0);
+   return(0);
 }

 #ifdef PNG_INFO_IMAGE_SUPPORTED
 png_bytepp PNGAPI
-png_get_rows(png_structp png_ptr, png_infop info_ptr)
+png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->row_pointers);

-   else
-      return(0);
+   return(0);
 }
 #endif

 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Easy access to info, added in libpng-0.99 */
 png_uint_32 PNGAPI
-png_get_image_width(png_structp png_ptr, png_infop info_ptr)
+png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->width;
@@ -60,7 +58,7 @@ png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_image_height(png_structp png_ptr, png_infop info_ptr)
+png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->height;
@@ -69,7 +67,7 @@ png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
+png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->bit_depth;
@@ -78,7 +76,7 @@ png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_color_type(png_structp png_ptr, png_infop info_ptr)
+png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->color_type;
@@ -87,7 +85,7 @@ png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
+png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->filter_type;
@@ -96,7 +94,7 @@ png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
+png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->interlace_type;
@@ -105,7 +103,7 @@ png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
+png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->compression_type;
@@ -114,222 +112,274 @@ png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
 #ifdef PNG_pHYs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_pHYs)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter");
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+      {
+         png_debug1(1, "in %s retrieval function",
+             "png_get_x_pixels_per_meter");

-      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
-         return (0);
-
-      else
-         return (info_ptr->x_pixels_per_unit);
-   }
-#else
-   return (0);
+         if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
+            return (info_ptr->x_pixels_per_unit);
+      }
 #endif
+
   return (0);
 }

 png_uint_32 PNGAPI
-png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
 #ifdef PNG_pHYs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
   {
-      png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter");
+      png_debug1(1, "in %s retrieval function",
+          "png_get_y_pixels_per_meter");

-      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
-         return (0);
-
-      else
+      if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
         return (info_ptr->y_pixels_per_unit);
   }
-#else
-   return (0);
 #endif
+
   return (0);
 }

 png_uint_32 PNGAPI
-png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
 #ifdef PNG_pHYs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
   {
      png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");

-      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
-          info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
-         return (0);
-
-      else
+      if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
+          info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
         return (info_ptr->x_pixels_per_unit);
   }
-#else
-   return (0);
 #endif
+
   return (0);
 }

 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
+png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
-#ifdef PNG_pHYs_SUPPORTED
-
-   if (info_ptr->valid & PNG_INFO_pHYs)
+#ifdef PNG_READ_pHYs_SUPPORTED
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
   {
      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");

-      if (info_ptr->x_pixels_per_unit == 0)
-         return ((float)0.0);
-
-      else
+      if (info_ptr->x_pixels_per_unit != 0)
         return ((float)((float)info_ptr->y_pixels_per_unit
             /(float)info_ptr->x_pixels_per_unit));
   }
-#else
-      return (0.0);
 #endif
+
   return ((float)0.0);
 }
 #endif

-png_int_32 PNGAPI
-png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_fixed_point PNGAPI
+png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,
+    png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
-#ifdef PNG_oFFs_SUPPORTED
+#ifdef PNG_READ_pHYs_SUPPORTED
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
+       && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0
+       && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX
+       && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
+   {
+      png_fixed_point res;

-   if (info_ptr->valid & PNG_INFO_oFFs)
+      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
+
+      /* The following casts work because a PNG 4 byte integer only has a valid
+       * range of 0..2^31-1; otherwise the cast might overflow.
+       */
+      if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
+          (png_int_32)info_ptr->x_pixels_per_unit))
+         return res;
+   }
+#endif
+
+   return 0;
+}
+#endif
+
+png_int_32 PNGAPI
+png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
+{
+#ifdef PNG_oFFs_SUPPORTED
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
   {
      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");

-      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
-         return (0);
-
-      else
+      if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
         return (info_ptr->x_offset);
   }
-#else
-      return (0);
 #endif
+
   return (0);
 }

 png_int_32 PNGAPI
-png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
-
 #ifdef PNG_oFFs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_oFFs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
   {
      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");

-      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
-         return (0);
-
-      else
+      if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
         return (info_ptr->y_offset);
   }
-#else
-   return (0);
 #endif
+
   return (0);
 }

 png_int_32 PNGAPI
-png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
-
 #ifdef PNG_oFFs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_oFFs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
   {
-      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");

-      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
-         return (0);
-
-      else
+      if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
         return (info_ptr->x_offset);
   }
-#else
-   return (0);
 #endif
+
   return (0);
 }

 png_int_32 PNGAPI
-png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   if (png_ptr != NULL && info_ptr != NULL)
-
 #ifdef PNG_oFFs_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_oFFs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
   {
-      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");

-      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
-         return (0);
-
-      else
+      if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
         return (info_ptr->y_offset);
   }
-#else
-   return (0);
 #endif
+
   return (0);
 }

-#if defined(PNG_INCH_CONVERSIONS_SUPPORTED) && \
-    defined(PNG_FLOATING_POINT_SUPPORTED)
-png_uint_32 PNGAPI
-png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+#ifdef PNG_INCH_CONVERSIONS_SUPPORTED
+static png_uint_32
+ppi_from_ppm(png_uint_32 ppm)
 {
-   return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
-       *.0254 +.5));
+#if 0
+   /* The conversion is *(2.54/100), in binary (32 digits):
+    * .00000110100000001001110101001001
+    */
+   png_uint_32 t1001, t1101;
+   ppm >>= 1;                  /* .1 */
+   t1001 = ppm + (ppm >> 3);   /* .1001 */
+   t1101 = t1001 + (ppm >> 1); /* .1101 */
+   ppm >>= 20;                 /* .000000000000000000001 */
+   t1101 += t1101 >> 15;       /* .1101000000000001101 */
+   t1001 >>= 11;               /* .000000000001001 */
+   t1001 += t1001 >> 12;       /* .000000000001001000000001001 */
+   ppm += t1001;               /* .000000000001001000001001001 */
+   ppm += t1101;               /* .110100000001001110101001001 */
+   return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
+#else
+   /* The argument is a PNG unsigned integer, so it is not permitted
+    * to be bigger than 2^31.
+    */
+   png_fixed_point result;
+   if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
+       5000))
+      return result;
+
+   /* Overflow. */
+   return 0;
+#endif
 }

 png_uint_32 PNGAPI
-png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
-       *.0254 +.5));
+   return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 }

 png_uint_32 PNGAPI
-png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
-       *.0254 +.5));
+   return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
 }

+png_uint_32 PNGAPI
+png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
+{
+   return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
+}
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+static png_fixed_point
+png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns)
+{
+   /* Convert from metres * 1,000,000 to inches * 100,000, meters to
+    * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
+    * Notice that this can overflow - a warning is output and 0 is
+    * returned.
+    */
+   return png_muldiv_warn(png_ptr, microns, 500, 127);
+}
+
+png_fixed_point PNGAPI
+png_get_x_offset_inches_fixed(png_structp png_ptr,
+    png_const_infop info_ptr)
+{
+   return png_fixed_inches_from_microns(png_ptr,
+       png_get_x_offset_microns(png_ptr, info_ptr));
+}
+#endif
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_fixed_point PNGAPI
+png_get_y_offset_inches_fixed(png_structp png_ptr,
+    png_const_infop info_ptr)
+{
+   return png_fixed_inches_from_microns(png_ptr,
+       png_get_y_offset_microns(png_ptr, info_ptr));
+}
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
-       *.00003937);
+   /* To avoid the overflow do the conversion directly in floating
+    * point.
+    */
+   return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
 }
+#endif

+#ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
 {
-   return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
-       *.00003937);
+   /* To avoid the overflow do the conversion directly in floating
+    * point.
+    */
+   return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
 }
+#endif

 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
+png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
   png_uint_32 retval = 0;
@@ -354,6 +404,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
      {
         *unit_type = (int)info_ptr->phys_unit_type;
         retval |= PNG_INFO_pHYs;
+
         if (*unit_type == 1)
         {
            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
@@ -361,38 +412,37 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
         }
      }
   }
+
   return (retval);
 }
 #endif /* PNG_pHYs_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */

 /* png_get_channels really belongs in here, too, but it's been around longer */

 #endif  /* PNG_EASY_ACCESS_SUPPORTED */

 png_byte PNGAPI
-png_get_channels(png_structp png_ptr, png_infop info_ptr)
+png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->channels);

-   else
-      return (0);
+   return (0);
 }

-png_bytep PNGAPI
-png_get_signature(png_structp png_ptr, png_infop info_ptr)
+png_const_bytep PNGAPI
+png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->signature);

-   else
-      return (NULL);
+   return (NULL);
 }

 #ifdef PNG_bKGD_SUPPORTED
 png_uint_32 PNGAPI
-png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
+png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr,
   png_color_16p *background)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
@@ -403,14 +453,15 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
      *background = &(info_ptr->background);
      return (PNG_INFO_bKGD);
   }
+
   return (0);
 }
 #endif

 #ifdef PNG_cHRM_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
+png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr,
    double *white_x, double *white_y, double *red_x, double *red_y,
    double *green_x, double *green_y, double *blue_x, double *blue_y)
 {
@@ -419,29 +470,31 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
      png_debug1(1, "in %s retrieval function", "cHRM");

      if (white_x != NULL)
-         *white_x = (double)info_ptr->x_white;
+         *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X");
      if (white_y != NULL)
-         *white_y = (double)info_ptr->y_white;
+         *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y");
      if (red_x != NULL)
-         *red_x = (double)info_ptr->x_red;
+         *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X");
      if (red_y != NULL)
-         *red_y = (double)info_ptr->y_red;
+         *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y");
      if (green_x != NULL)
-         *green_x = (double)info_ptr->x_green;
+         *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X");
      if (green_y != NULL)
-         *green_y = (double)info_ptr->y_green;
+         *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y");
      if (blue_x != NULL)
-         *blue_x = (double)info_ptr->x_blue;
+         *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X");
      if (blue_y != NULL)
-         *blue_y = (double)info_ptr->y_blue;
+         *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y");
      return (PNG_INFO_cHRM);
   }
+
   return (0);
 }
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#  endif
+
+#  ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
    png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
    png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
    png_fixed_point *blue_x, png_fixed_point *blue_y)
@@ -451,66 +504,66 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
   {
      if (white_x != NULL)
-         *white_x = info_ptr->int_x_white;
+         *white_x = info_ptr->x_white;
      if (white_y != NULL)
-         *white_y = info_ptr->int_y_white;
+         *white_y = info_ptr->y_white;
      if (red_x != NULL)
-         *red_x = info_ptr->int_x_red;
+         *red_x = info_ptr->x_red;
      if (red_y != NULL)
-         *red_y = info_ptr->int_y_red;
+         *red_y = info_ptr->y_red;
      if (green_x != NULL)
-         *green_x = info_ptr->int_x_green;
+         *green_x = info_ptr->x_green;
      if (green_y != NULL)
-         *green_y = info_ptr->int_y_green;
+         *green_y = info_ptr->y_green;
      if (blue_x != NULL)
-         *blue_x = info_ptr->int_x_blue;
+         *blue_x = info_ptr->x_blue;
      if (blue_y != NULL)
-         *blue_y = info_ptr->int_y_blue;
+         *blue_y = info_ptr->y_blue;
      return (PNG_INFO_cHRM);
   }
+
   return (0);
 }
-#endif
+#  endif
 #endif

 #ifdef PNG_gAMA_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
+png_uint_32 PNGFAPI
+png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_fixed_point *file_gamma)
 {
   png_debug1(1, "in %s retrieval function", "gAMA");

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
       && file_gamma != NULL)
   {
-      *file_gamma = (double)info_ptr->gamma;
+      *file_gamma = info_ptr->gamma;
      return (PNG_INFO_gAMA);
   }
+
   return (0);
 }
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
-    png_fixed_point *int_file_gamma)
+png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
+    double *file_gamma)
 {
-   png_debug1(1, "in %s retrieval function", "gAMA");
+   png_fixed_point igamma;
+   png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);

-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
-       && int_file_gamma != NULL)
-   {
-      *int_file_gamma = info_ptr->int_gamma;
-      return (PNG_INFO_gAMA);
-   }
+   if (ok)
+      *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA");

-   return (0);
+   return ok;
 }
-#endif
+
+#  endif
 #endif

 #ifdef PNG_sRGB_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
+png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr,
+    int *file_srgb_intent)
 {
   png_debug1(1, "in %s retrieval function", "sRGB");

@@ -527,9 +580,9 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)

 #ifdef PNG_iCCP_SUPPORTED
 png_uint_32 PNGAPI
-png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,
    png_charpp name, int *compression_type,
-    png_charpp profile, png_uint_32 *proflen)
+    png_bytepp profile, png_uint_32 *proflen)
 {
   png_debug1(1, "in %s retrieval function", "iCCP");

@@ -552,7 +605,7 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_sPLT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr,
    png_sPLT_tpp spalettes)
 {
   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
@@ -567,7 +620,8 @@ png_get_sPLT(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_hIST_SUPPORTED
 png_uint_32 PNGAPI
-png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
+png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_16p *hist)
 {
   png_debug1(1, "in %s retrieval function", "hIST");

@@ -623,7 +677,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_oFFs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
+png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr,
    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 {
   png_debug1(1, "in %s retrieval function", "oFFs");
@@ -643,7 +697,7 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_pCAL_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
+png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr,
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
    png_charp *units, png_charpp *params)
 {
@@ -668,27 +722,47 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 #endif

 #ifdef PNG_sCAL_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+#    ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr,
+    int *unit, png_fixed_point *width, png_fixed_point *height)
+{
+   if (png_ptr != NULL && info_ptr != NULL &&
+       (info_ptr->valid & PNG_INFO_sCAL))
+   {
+      *unit = info_ptr->scal_unit;
+      /*TODO: make this work without FP support */
+      *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
+      *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
+         "sCAL height");
+      return (PNG_INFO_sCAL);
+   }
+
+   return(0);
+}
+#    endif /* FLOATING_ARITHMETIC */
+#  endif /* FIXED_POINT */
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr,
    int *unit, double *width, double *height)
 {
   if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->valid & PNG_INFO_sCAL))
   {
      *unit = info_ptr->scal_unit;
-      *width = info_ptr->scal_pixel_width;
-      *height = info_ptr->scal_pixel_height;
+      *width = atof(info_ptr->scal_s_width);
+      *height = atof(info_ptr->scal_s_height);
      return (PNG_INFO_sCAL);
   }

   return(0);
 }
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#  endif /* FLOATING POINT */
 png_uint_32 PNGAPI
-png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
-             int *unit, png_charpp width, png_charpp height)
+png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr,
+    int *unit, png_charpp width, png_charpp height)
 {
   if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->valid & PNG_INFO_sCAL))
@@ -701,13 +775,11 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,

   return(0);
 }
-#endif
-#endif
-#endif
+#endif /* sCAL */

 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
+png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
   png_uint_32 retval = 0;
@@ -738,11 +810,11 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,

   return (retval);
 }
-#endif
+#endif /* pHYs */

 png_uint_32 PNGAPI
-png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
-    int *num_palette)
+png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_colorp *palette, int *num_palette)
 {
   png_debug1(1, "in %s retrieval function", "PLTE");

@@ -760,7 +832,8 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,

 #ifdef PNG_sBIT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
+png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr,
+    png_color_8p *sig_bit)
 {
   png_debug1(1, "in %s retrieval function", "sBIT");

@@ -777,8 +850,8 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)

 #ifdef PNG_TEXT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
-    int *num_text)
+png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_textp *text_ptr, int *num_text)
 {
   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
   {
@@ -804,7 +877,7 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,

 #ifdef PNG_tIME_SUPPORTED
 png_uint_32 PNGAPI
-png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
+png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
   png_debug1(1, "in %s retrieval function", "tIME");

@@ -821,7 +894,7 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)

 #ifdef PNG_tRNS_SUPPORTED
 png_uint_32 PNGAPI
-png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
+png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr,
    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
 {
   png_uint_32 retval = 0;
@@ -865,14 +938,14 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
 #endif

 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
-png_uint_32 PNGAPI
-png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+int PNGAPI
+png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr,
    png_unknown_chunkpp unknowns)
 {
   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
   {
      *unknowns = info_ptr->unknown_chunks;
-      return ((png_uint_32)info_ptr->unknown_chunks_num);
+      return info_ptr->unknown_chunks_num;
   }

   return (0);
@@ -881,7 +954,7 @@ png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 png_byte PNGAPI
-png_get_rgb_to_gray_status (png_structp png_ptr)
+png_get_rgb_to_gray_status (png_const_structp png_ptr)
 {
   return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
 }
@@ -889,14 +962,14 @@ png_get_rgb_to_gray_status (png_structp png_ptr)

 #ifdef PNG_USER_CHUNKS_SUPPORTED
 png_voidp PNGAPI
-png_get_user_chunk_ptr(png_structp png_ptr)
+png_get_user_chunk_ptr(png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
 }
 #endif

 png_size_t PNGAPI
-png_get_compression_buffer_size(png_structp png_ptr)
+png_get_compression_buffer_size(png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->zbuf_size : 0L);
 }
@@ -906,24 +979,27 @@ png_get_compression_buffer_size(png_structp png_ptr)
 /* These functions were added to libpng 1.2.6 and were enabled
 * by default in libpng-1.4.0 */
 png_uint_32 PNGAPI
-png_get_user_width_max (png_structp png_ptr)
+png_get_user_width_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_width_max : 0);
 }
+
 png_uint_32 PNGAPI
-png_get_user_height_max (png_structp png_ptr)
+png_get_user_height_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_height_max : 0);
 }
+
 /* This function was added to libpng 1.4.0 */
 png_uint_32 PNGAPI
-png_get_chunk_cache_max (png_structp png_ptr)
+png_get_chunk_cache_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
 }
+
 /* This function was added to libpng 1.4.1 */
 png_alloc_size_t PNGAPI
-png_get_chunk_malloc_max (png_structp png_ptr)
+png_get_chunk_malloc_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
 }
@@ -937,7 +1013,16 @@ png_get_io_state (png_structp png_ptr)
   return png_ptr->io_state;
 }

-png_bytep PNGAPI
+png_uint_32 PNGAPI
+png_get_io_chunk_type (png_const_structp png_ptr)
+{
+   return ((png_ptr->chunk_name[0] << 24) +
+           (png_ptr->chunk_name[1] << 16) +
+           (png_ptr->chunk_name[2] <<  8) +
+           (png_ptr->chunk_name[3]));
+}
+
+png_const_bytep PNGAPI
 png_get_io_chunk_name (png_structp png_ptr)
 {
   return png_ptr->chunk_name;
--- a/pnginfo.h
+++ b/pnginfo.h
@@ -1,11 +1,11 @@

 /* pnginfo.h - header file for PNG reference library
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
- * Last changed in libpng version 1.5.0 - June 22, 2010
+ * Last changed in libpng 1.5.0 [January 6, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -82,12 +82,12 @@ struct png_info_def
    * and initialize the appropriate fields below.
    */

-#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
   /* The gAMA chunk describes the gamma characteristics of the system
    * on which the image was created, normally in the range [1.0, 2.5].
    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
    */
-   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
+   png_fixed_point gamma;
 #endif

 #ifdef PNG_sRGB_SUPPORTED
@@ -191,16 +191,14 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    * colors in the image as the creator.  Values are in the range
    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
    */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float x_white;
-   float y_white;
-   float x_red;
-   float y_red;
-   float x_green;
-   float y_green;
-   float x_blue;
-   float y_blue;
-#endif
+   png_fixed_point x_white;
+   png_fixed_point y_white;
+   png_fixed_point x_red;
+   png_fixed_point y_red;
+   png_fixed_point x_green;
+   png_fixed_point y_green;
+   png_fixed_point x_blue;
+   png_fixed_point y_blue;
 #endif

 #ifdef PNG_pCAL_SUPPORTED
@@ -231,14 +229,13 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
   /* Storage for unknown chunks that the library doesn't recognize. */
   png_unknown_chunkp unknown_chunks;
-   png_size_t unknown_chunks_num;
+   int unknown_chunks_num;
 #endif

 #ifdef PNG_iCCP_SUPPORTED
   /* iCCP chunk data. */
   png_charp iccp_name;     /* profile name */
-   png_charp iccp_profile;  /* International Color Consortium profile data */
-                            /* Note to maintainer: should be png_bytep */
+   png_bytep iccp_profile;  /* International Color Consortium profile data */
   png_uint_32 iccp_proflen;  /* ICC profile data length */
   png_byte iccp_compression; /* Always zero */
 #endif
@@ -254,19 +251,13 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    * subject matter of the graphic.  The chunk contains a unit specification
    * a byte value, and two ASCII strings representing floating-point
    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  This external representation is converted to double
-    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
+    * in the image.  Data values are valid if (valid & PNG_INFO_sCAL) is
+    * non-zero.
    */
   png_byte scal_unit;         /* unit of physical scale */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   double scal_pixel_width;    /* width of one pixel */
-   double scal_pixel_height;   /* height of one pixel */
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
   png_charp scal_s_width;     /* string containing height */
   png_charp scal_s_height;    /* string containing width */
 #endif
-#endif

 #ifdef PNG_INFO_IMAGE_SUPPORTED
   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
@@ -275,20 +266,5 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
   png_bytepp row_pointers;        /* the image bits */
 #endif

-#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
-   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
-   png_fixed_point int_x_white;
-   png_fixed_point int_y_white;
-   png_fixed_point int_x_red;
-   png_fixed_point int_y_red;
-   png_fixed_point int_x_green;
-   png_fixed_point int_y_green;
-   png_fixed_point int_x_blue;
-   png_fixed_point int_y_blue;
-#endif
-
 };
 #endif /* PNGINFO_H */
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,8 +1,8 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.3 [(PENDING RELEASE)]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -27,16 +27,17 @@

 /* Allocate memory for a png_struct.  The malloc and memset can be replaced
   by a single call to calloc() if this is thought to improve performance. */
-png_voidp /* PRIVATE */
-png_create_struct(int type)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
 {
 #  ifdef PNG_USER_MEM_SUPPORTED
   return (png_create_struct_2(type, NULL, NULL));
 }

 /* Alternate version of png_create_struct, for use with user-defined malloc. */
-png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
 {
 #  endif /* PNG_USER_MEM_SUPPORTED */
   png_size_t size;
@@ -119,8 +120,8 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 * result, we would be truncating potentially larger memory requests
 * (which should cause a fatal error) and introducing major problems.
 */
-png_voidp PNGAPI
-png_calloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -132,8 +133,8 @@ png_calloc(png_structp png_ptr, png_alloc_size_t size)
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -153,8 +154,8 @@ png_malloc(png_structp png_ptr, png_alloc_size_t size)
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;
 #  endif /* PNG_USER_MEM_SUPPORTED */
@@ -186,8 +187,9 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
            int num_blocks;
            png_uint_32 total_size;
            png_bytep table;
-            int i;
+            int i, mem_level, window_bits;
            png_byte huge * hptr;
+            int window_bits

            if (ret != NULL)
            {
@@ -195,14 +197,22 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
               ret = NULL;
            }

-            if (png_ptr->zlib_window_bits > 14)
-               num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
+            window_bits =
+                png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ?
+                png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits;
+
+            if (window_bits > 14)
+               num_blocks = (int)(1 << (window_bits - 14));

            else
               num_blocks = 1;

-            if (png_ptr->zlib_mem_level >= 7)
-               num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
+            mem_level =
+                png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ?
+                png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level;
+
+            if (mem_level >= 7)
+               num_blocks += (int)(1 << (mem_level - 7));

            else
               num_blocks++;
@@ -276,7 +286,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
      {
 #  ifndef PNG_USER_MEM_SUPPORTED
         if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-            png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
+            png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */

         else
            png_warning(png_ptr, "Out of Memory");
@@ -364,8 +374,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 /* Allocate memory for a png_struct or a png_info.  The malloc and
   memset can be replaced by a single call to calloc() if this is thought
   to improve performance noticably. */
-png_voidp /* PRIVATE */
-png_create_struct(int type)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
 {
 #  ifdef PNG_USER_MEM_SUPPORTED
   return (png_create_struct_2(type, NULL, NULL));
@@ -374,8 +384,9 @@ png_create_struct(int type)
 /* Allocate memory for a png_struct or a png_info.  The malloc and
   memset can be replaced by a single call to calloc() if this is thought
   to improve performance noticably. */
-png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
 {
 #  endif /* PNG_USER_MEM_SUPPORTED */
   png_size_t size;
@@ -470,8 +481,8 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 * have the ability to do that.
 */

-png_voidp PNGAPI
-png_calloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -483,8 +494,8 @@ png_calloc(png_structp png_ptr, png_alloc_size_t size)
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -504,8 +515,8 @@ png_malloc(png_structp png_ptr, png_alloc_size_t size)
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;
 #  endif /* PNG_USER_MEM_SUPPORTED */
@@ -579,6 +590,7 @@ png_free(png_structp png_ptr, png_voidp ptr)
   else
      png_free_default(png_ptr, ptr);
 }
+
 void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
 {
@@ -600,7 +612,6 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 #    endif
 #  endif
 }
-
 #endif /* Not Borland DOS special memory handler */

 /* This function was added at libpng version 1.2.3.  The png_malloc_warn()
@@ -608,8 +619,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 * instead of issuing a png_error, if it fails to allocate the requested
 * memory.
 */
-png_voidp PNGAPI
-png_malloc_warn(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ptr;
   png_uint_32 save_flags;
@@ -645,7 +656,7 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_mem_ptr(png_structp png_ptr)
+png_get_mem_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,8 +1,8 @@

 /* pngpread.c - read a png file in push mode
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.2 [March 31, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -41,6 +41,64 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
   }
 }

+png_size_t PNGAPI
+png_process_data_pause(png_structp png_ptr, int save)
+{
+   if (png_ptr != NULL)
+   {
+      /* It's easiest for the caller if we do the save, then the caller doesn't
+       * have to supply the same data again:
+       */
+      if (save)
+         png_push_save_buffer(png_ptr);
+      else
+      {
+         /* This includes any pending saved bytes: */
+         png_size_t remaining = png_ptr->buffer_size;
+         png_ptr->buffer_size = 0;
+
+         /* So subtract the saved buffer size, unless all the data
+          * is actually 'saved', in which case we just return 0
+          */
+         if (png_ptr->save_buffer_size < remaining)
+            return remaining - png_ptr->save_buffer_size;
+      }
+   }
+
+   return 0;
+}
+
+png_uint_32 PNGAPI
+png_process_data_skip(png_structp png_ptr)
+{
+   png_uint_32 remaining = 0;
+
+   if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE &&
+      png_ptr->skip_length > 0)
+   {
+      /* At the end of png_process_data the buffer size must be 0 (see the loop
+       * above) so we can detect a broken call here:
+       */
+      if (png_ptr->buffer_size != 0)
+         png_error(png_ptr,
+            "png_process_data_skip called inside png_process_data");
+
+      /* If is impossible for there to be a saved buffer at this point -
+       * otherwise we could not be in SKIP mode.  This will also happen if
+       * png_process_skip is called inside png_process_data (but only very
+       * rarely.)
+       */
+      if (png_ptr->save_buffer_size != 0)
+         png_error(png_ptr, "png_process_data_skip called with saved data");
+
+      remaining = png_ptr->skip_length;
+      png_ptr->skip_length = 0;
+      png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+   }
+
+   return remaining;
+}
+
 /* What we do with the incoming data depends on what we were previously
 * doing before we ran out of data...
 */
@@ -582,34 +640,45 @@ png_push_crc_finish(png_structp png_ptr)
 {
   if (png_ptr->skip_length && png_ptr->save_buffer_size)
   {
-      png_size_t save_size;
+      png_size_t save_size = png_ptr->save_buffer_size;
+      png_uint_32 skip_length = png_ptr->skip_length;

-      if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
-         save_size = (png_size_t)png_ptr->skip_length;
+      /* We want the smaller of 'skip_length' and 'save_buffer_size', but
+       * they are of different types and we don't know which variable has the
+       * fewest bits.  Carefully select the smaller and cast it to the type of
+       * the larger - this cannot overflow.  Do not cast in the following test
+       * - it will break on either 16 or 64 bit platforms.
+       */
+      if (skip_length < save_size)
+         save_size = (png_size_t)skip_length;

      else
-         save_size = png_ptr->save_buffer_size;
+         skip_length = (png_uint_32)save_size;

      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);

-      png_ptr->skip_length -= save_size;
+      png_ptr->skip_length -= skip_length;
      png_ptr->buffer_size -= save_size;
      png_ptr->save_buffer_size -= save_size;
      png_ptr->save_buffer_ptr += save_size;
   }
   if (png_ptr->skip_length && png_ptr->current_buffer_size)
   {
-      png_size_t save_size;
+      png_size_t save_size = png_ptr->current_buffer_size;
+      png_uint_32 skip_length = png_ptr->skip_length;

-      if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
-         save_size = (png_size_t)png_ptr->skip_length;
+      /* We want the smaller of 'skip_length' and 'current_buffer_size', here,
+       * the same problem exists as above and the same solution.
+       */
+      if (skip_length < save_size)
+         save_size = (png_size_t)skip_length;

      else
-         save_size = png_ptr->current_buffer_size;
+         skip_length = (png_uint_32)save_size;

      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);

-      png_ptr->skip_length -= save_size;
+      png_ptr->skip_length -= skip_length;
      png_ptr->buffer_size -= save_size;
      png_ptr->current_buffer_size -= save_size;
      png_ptr->current_buffer_ptr += save_size;
@@ -771,49 +840,52 @@ png_push_read_IDAT(png_structp png_ptr)
   }
   if (png_ptr->idat_size && png_ptr->save_buffer_size)
   {
-      png_size_t save_size;
+      png_size_t save_size = png_ptr->save_buffer_size;
+      png_uint_32 idat_size = png_ptr->idat_size;

-      if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
-      {
-         save_size = (png_size_t)png_ptr->idat_size;
-
-         /* Check for overflow */
-         if ((png_uint_32)save_size != png_ptr->idat_size)
-            png_error(png_ptr, "save_size overflowed in pngpread");
-      }
+      /* We want the smaller of 'idat_size' and 'current_buffer_size', but they
+       * are of different types and we don't know which variable has the fewest
+       * bits.  Carefully select the smaller and cast it to the type of the
+       * larger - this cannot overflow.  Do not cast in the following test - it
+       * will break on either 16 or 64 bit platforms.
+       */
+      if (idat_size < save_size)
+         save_size = (png_size_t)idat_size;

      else
-         save_size = png_ptr->save_buffer_size;
+         idat_size = (png_uint_32)save_size;

      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);

      png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);

-      png_ptr->idat_size -= save_size;
+      png_ptr->idat_size -= idat_size;
      png_ptr->buffer_size -= save_size;
      png_ptr->save_buffer_size -= save_size;
      png_ptr->save_buffer_ptr += save_size;
   }
+
   if (png_ptr->idat_size && png_ptr->current_buffer_size)
   {
-      png_size_t save_size;
+      png_size_t save_size = png_ptr->current_buffer_size;
+      png_uint_32 idat_size = png_ptr->idat_size;

-      if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
-      {
-         save_size = (png_size_t)png_ptr->idat_size;
+      /* We want the smaller of 'idat_size' and 'current_buffer_size', but they
+       * are of different types and we don't know which variable has the fewest
+       * bits.  Carefully select the smaller and cast it to the type of the
+       * larger - this cannot overflow.
+       */
+      if (idat_size < save_size)
+         save_size = (png_size_t)idat_size;

-         /* Check for overflow */
-         if ((png_uint_32)save_size != png_ptr->idat_size)
-            png_error(png_ptr, "save_size overflowed in pngpread");
-      }
      else
-         save_size = png_ptr->current_buffer_size;
+         idat_size = (png_uint_32)save_size;

      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);

      png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);

-      png_ptr->idat_size -= save_size;
+      png_ptr->idat_size -= idat_size;
      png_ptr->buffer_size -= save_size;
      png_ptr->current_buffer_size -= save_size;
      png_ptr->current_buffer_ptr += save_size;
@@ -851,7 +923,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
    * or the stream marked as finished.
    */
   while (png_ptr->zstream.avail_in > 0 &&
-	  !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+          !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
   {
      int ret;

@@ -881,51 +953,51 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
      /* Check for any failure before proceeding. */
      if (ret != Z_OK && ret != Z_STREAM_END)
      {
-	 /* Terminate the decompression. */
-	 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+         /* Terminate the decompression. */
+         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;

         /* This may be a truncated stream (missing or
-	  * damaged end code).  Treat that as a warning.
-	  */
+          * damaged end code).  Treat that as a warning.
+          */
         if (png_ptr->row_number >= png_ptr->num_rows ||
-	     png_ptr->pass > 6)
-	    png_warning(png_ptr, "Truncated compressed data in IDAT");
+             png_ptr->pass > 6)
+            png_warning(png_ptr, "Truncated compressed data in IDAT");

-	 else
-	    png_error(png_ptr, "Decompression error in IDAT");
+         else
+            png_error(png_ptr, "Decompression error in IDAT");

-	 /* Skip the check on unprocessed input */
+         /* Skip the check on unprocessed input */
         return;
      }

      /* Did inflate output any data? */
      if (png_ptr->zstream.next_out != png_ptr->row_buf)
      {
-	 /* Is this unexpected data after the last row?
-	  * If it is, artificially terminate the LZ output
-	  * here.
-	  */
+         /* Is this unexpected data after the last row?
+          * If it is, artificially terminate the LZ output
+          * here.
+          */
         if (png_ptr->row_number >= png_ptr->num_rows ||
-	     png_ptr->pass > 6)
+             png_ptr->pass > 6)
         {
-	    /* Extra data. */
-	    png_warning(png_ptr, "Extra compressed data in IDAT");
+            /* Extra data. */
+            png_warning(png_ptr, "Extra compressed data in IDAT");
            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;

-	    /* Do no more processing; skip the unprocessed
-	     * input check below.
-	     */
+            /* Do no more processing; skip the unprocessed
+             * input check below.
+             */
            return;
-	 }
+         }

-	 /* Do we have a complete row? */
-	 if (png_ptr->zstream.avail_out == 0)
-	    png_push_process_row(png_ptr);
-
-	 /* And check for the end of the stream. */
-	 if (ret == Z_STREAM_END)
-            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+         /* Do we have a complete row? */
+         if (png_ptr->zstream.avail_out == 0)
+            png_push_process_row(png_ptr);
      }
+
+      /* And check for the end of the stream. */
+      if (ret == Z_STREAM_END)
+         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
   }

   /* All the data should have been processed, if anything
@@ -954,7 +1026,7 @@ png_push_process_row(png_structp png_ptr)

   png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);

-   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
+   if (png_ptr->transformations)
      png_do_read_transformations(png_ptr);

 #ifdef PNG_READ_INTERLACING_SUPPORTED
@@ -1120,6 +1192,8 @@ png_push_process_row(png_structp png_ptr)

            break;
         }
+
+         default:
         case 6:
         {
            png_push_have_row(png_ptr, png_ptr->row_buf + 1);
@@ -1212,8 +1286,9 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 {
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
+         PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
         png_error(png_ptr, "Out of place tEXt");
-         info_ptr = info_ptr; /* To quiet some compiler warnings */
+         /*NOT REACHED*/
      }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1308,8 +1383,9 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 {
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
   {
+      PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
      png_error(png_ptr, "Out of place zTXt");
-      info_ptr = info_ptr; /* To quiet some compiler warnings */
+      /*NOT REACHED*/
   }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1391,7 +1467,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

      text++;

-      png_ptr->zstream.next_in = (png_bytep )text;
+      png_ptr->zstream.next_in = (png_bytep)text;
      png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
          (text - key));
      png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -1440,7 +1516,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

               tmp = text;
               text = (png_charp)png_malloc(png_ptr, text_size +
-                   (png_ptr->zbuf_size 
+                   (png_ptr->zbuf_size
                   - png_ptr->zstream.avail_out + 1));

               png_memcpy(text, tmp, text_size);
@@ -1511,8 +1587,9 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 {
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
   {
+      PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
      png_error(png_ptr, "Out of place iTXt");
-      info_ptr = info_ptr; /* To quiet some compiler warnings */
+      /*NOT REACHED*/
   }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1648,7 +1725,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
 #endif
         png_chunk_error(png_ptr, "unknown critical chunk");

-      info_ptr = info_ptr; /* To quiet some compiler warnings */
+      PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
   }

 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
@@ -1663,7 +1740,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
      }
 #endif
      png_memcpy((png_charp)png_ptr->unknown_chunk.name,
-          (png_charp)png_ptr->chunk_name, 
+          (png_charp)png_ptr->chunk_name,
          png_sizeof(png_ptr->unknown_chunk.name));
      png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
          = '\0';
@@ -1738,8 +1815,8 @@ png_push_have_row(png_structp png_ptr, png_bytep row)
 }

 void PNGAPI
-png_progressive_combine_row (png_structp png_ptr,
-    png_bytep old_row, png_bytep new_row)
+png_progressive_combine_row (png_structp png_ptr, png_bytep old_row,
+    png_const_bytep new_row)
 {
   PNG_CONST int FARDATA png_pass_dsp_mask[7] =
      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
@@ -1767,7 +1844,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
 }

 png_voidp PNGAPI
-png_get_progressive_ptr(png_structp png_ptr)
+png_get_progressive_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,12 +1,13 @@

 /* pngpriv.h - private declarations for use inside libpng
 *
- * libpng version 1.5.0beta30 - June 22, 2010
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
+ * Last changed in libpng 1.5.3 [(PENDING RELEASE)]
+ *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
@@ -24,20 +25,30 @@
 #ifndef PNGPRIV_H
 #define PNGPRIV_H

+/* This is required for the definition of abort(), used as a last ditch
+ * error handler when all else fails.
+ */
+#include <stdlib.h>
+
 #define PNGLIB_BUILD
 #ifdef PNG_USER_CONFIG
 #  include "pngusr.h"
+   /* These should have been defined in pngusr.h */
+#  ifndef PNG_USER_PRIVATEBUILD
+#    define PNG_USER_PRIVATEBUILD "Custom libpng build"
+#  endif
+#  ifndef PNG_USER_DLLFNAME_POSTFIX
+#    define PNG_USER_DLLFNAME_POSTFIX "Cb"
+#  endif
 #endif
 #include "png.h"
 #include "pnginfo.h"
 #include "pngstruct.h"

-#include <stdlib.h>
-#ifdef BSD
-#  include <strings.h>
-#else
-#  include <string.h>
-#endif
+/* This is used for 16 bit gamma tables - only the top level pointers are const,
+ * this could be changed:
+ */
+typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;

 /* Added at libpng-1.2.9 */
 /* Moved to pngpriv.h at libpng-1.5.0 */
@@ -53,6 +64,10 @@
 #endif

 /* Moved to pngpriv.h at libpng-1.5.0 */
+/* NOTE: some of these may have been used in external applications as
+ * these definitions were exposed in pngconf.h prior to 1.5.
+ */
+
 /* If you are running on a machine where you cannot allocate more
 * than 64K of memory at once, uncomment this.  While libpng will not
 * normally need that much memory in a chunk (unless you load up a very
@@ -68,16 +83,22 @@
 #  define PNG_MAX_MALLOC_64K
 #endif

-/* Moved to pngpriv.h at libpng-1.5.0 */
-/* Feature support: in 1.4 this was in pngconf.h, but these
- * features have no affect on the libpng API.  Add library
- * only features to the end of this list.  Add features that
- * affect the API to scipts/config.dfn using png_on or png_off
- * as determined by the default and update scripts/config.std
+#ifndef PNG_UNUSED
+/* Unused formal parameter warnings are silenced using the following macro
+ * which is expected to have no bad effects on performance (optimizing
+ * compilers will probably remove it entirely).  Note that if you replace
+ * it with something other than whitespace, you must include the terminating
+ * semicolon.
 */
-/* Added at libpng version 1.4.0 */
-#if !defined(PNG_NO_WARNINGS) && !defined(PNG_WARNINGS_SUPPORTED)
-#  define PNG_WARNINGS_SUPPORTED
+#  define PNG_UNUSED(param) (void)param;
+#endif
+
+/* Just a little check that someone hasn't tried to define something
+ * contradictory.
+ */
+#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
+#  undef PNG_ZBUF_SIZE
+#  define PNG_ZBUF_SIZE 65536L
 #endif

 /* If warnings or errors are turned off the code is disabled
@@ -90,73 +111,44 @@
 #ifndef PNG_ERROR_TEXT_SUPPORTED
 #  define png_error(s1,s2) png_err(s1)
 #  define png_chunk_error(s1,s2) png_err(s1)
+#  define png_fixed_error(s1,s2) png_err(s1)
 #endif

-/* Added at libpng version 1.4.0 */
-#if !defined(PNG_NO_CHECK_cHRM) && !defined(PNG_CHECK_cHRM_SUPPORTED)
-#  define PNG_CHECK_cHRM_SUPPORTED
-#endif
-
-/* Added at libpng version 1.4.0 */
-#if !defined(PNG_NO_ALIGNED_MEMORY) && !defined(PNG_ALIGNED_MEMORY_SUPPORTED)
-#  define PNG_ALIGNED_MEMORY_SUPPORTED
-#endif
-
-/* Buggy compilers (e.g., gcc 2.7.2.2) need PNG_NO_POINTER_INDEXING
- * See png[wr]util.c
- */
-#if !defined(PNG_NO_POINTER_INDEXING) && \
-    !defined(PNG_POINTER_INDEXING_SUPPORTED)
-#  define PNG_POINTER_INDEXING_SUPPORTED
-#endif
-
-/* Other defines for things like memory and the like can go here.  */
-
-/* This controls how fine the quantizing gets.  As this allocates
- * a largish chunk of memory (32K), those who are not as concerned
- * with quantizing quality can decrease some or all of these.
- */
-#ifndef PNG_QUANTIZE_RED_BITS
-#  define PNG_QUANTIZE_RED_BITS 5
-#endif
-#ifndef PNG_QUANTIZE_GREEN_BITS
-#  define PNG_QUANTIZE_GREEN_BITS 5
-#endif
-#ifndef PNG_QUANTIZE_BLUE_BITS
-#  define PNG_QUANTIZE_BLUE_BITS 5
-#endif
-
-/* This controls how fine the gamma correction becomes when you
- * are only interested in 8 bits anyway.  Increasing this value
- * results in more memory being used, and more pow() functions
- * being called to fill in the gamma tables.  Don't set this value
- * less then 8, and even that may not work (I haven't tested it).
- */
-#ifndef PNG_MAX_GAMMA_8
-#  define PNG_MAX_GAMMA_8 11
-#endif
-
-/* This controls how much a difference in gamma we can tolerate before
- * we actually start doing gamma conversion.
- */
-#ifndef PNG_GAMMA_THRESHOLD
-#  define PNG_GAMMA_THRESHOLD 0.05
-#endif
-
+#ifndef PNG_EXTERN
 /* The functions exported by PNG_EXTERN are internal functions, which
 * aren't usually used outside the library (as far as I know), so it is
 * debatable if they should be exported at all.  In the future, when it
 * is possible to have run-time registry of chunk-handling functions,
- * some of these will be made available again.
-#define PNG_EXTERN extern
+ * some of these might be made available again.
+#  define PNG_EXTERN extern
 */
-#define PNG_EXTERN
+#  define PNG_EXTERN
+#endif
+
+/* Some fixed point APIs are still required even if not exported because
+ * they get used by the corresponding floating point APIs.  This magic
+ * deals with this:
+ */
+#ifdef PNG_FIXED_POINT_SUPPORTED
+#  define PNGFAPI PNGAPI
+#else
+#  define PNGFAPI /* PRIVATE */
+#endif

 /* Other defines specific to compilers can go here.  Try to keep
 * them inside an appropriate ifdef/endif pair for portability.
 */
+#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
+    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
+   /* png.c requires the following ANSI-C constants if the conversion of
+    * floating point to ASCII is implemented therein:
+    *
+    *  DBL_DIG  Maximum number of decimal digits (can be set to any constant)
+    *  DBL_MIN  Smallest normalized fp number (can be set to an arbitrary value)
+    *  DBL_MAX  Maximum floating point number (can be set to an arbitrary value)
+    */
+#  include <float.h>

-#ifdef PNG_FLOATING_POINT_SUPPORTED
 #  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
    defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
     /* We need to check that <math.h> hasn't already been included earlier
@@ -186,36 +178,87 @@
 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
    defined(_WIN32) || defined(__WIN32__)
 #  include <windows.h>  /* defines _WINDOWS_ macro */
-/* I have no idea why is this necessary... */
-#  ifdef _MSC_VER
-#    include <malloc.h>
+#endif
+
+/* Moved here around 1.5.0beta36 from pngconf.h */
+/* Users may want to use these so they are not private.  Any library
+ * functions that are passed far data must be model-independent.
+ */
+
+/* Memory model/platform independent fns */
+#ifndef PNG_ABORT
+#  ifdef _WINDOWS_
+#    define PNG_ABORT() ExitProcess(0)
+#  else
+#    define PNG_ABORT() abort()
 #  endif
 #endif

-/* This is the size of the compression buffer, and thus the size of
- * an IDAT chunk.  Make this whatever size you feel is best for your
- * machine.  One of these will be allocated per png_struct.  When this
- * is full, it writes the data to the disk, and does some other
- * calculations.  Making this an extremely small size will slow
- * the library down, but you may want to experiment to determine
- * where it becomes significant, if you are concerned with memory
- * usage.  Note that zlib allocates at least 32Kb also.  For readers,
- * this describes the size of the buffer available to read the data in.
- * Unless this gets smaller than the size of a row (compressed),
- * it should not make much difference how big this is.
- */
-
-#ifndef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 8192
+#ifdef USE_FAR_KEYWORD
+/* Use this to make far-to-near assignments */
+#  define CHECK   1
+#  define NOCHECK 0
+#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
+#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
+#  define png_strcpy  _fstrcpy
+#  define png_strncpy _fstrncpy   /* Added to v 1.2.6 */
+#  define png_strlen  _fstrlen
+#  define png_memcmp  _fmemcmp    /* SJT: added */
+#  define png_memcpy  _fmemcpy
+#  define png_memset  _fmemset
+#  define png_sprintf sprintf
+#else
+#  ifdef _WINDOWS_  /* Favor Windows over C runtime fns */
+#    define CVT_PTR(ptr)         (ptr)
+#    define CVT_PTR_NOCHECK(ptr) (ptr)
+#    define png_strcpy  lstrcpyA
+#    define png_strncpy lstrcpynA
+#    define png_strlen  lstrlenA
+#    define png_memcmp  memcmp
+#    define png_memcpy  CopyMemory
+#    define png_memset  memset
+#    define png_sprintf wsprintfA
+#  else
+#    define CVT_PTR(ptr)         (ptr)
+#    define CVT_PTR_NOCHECK(ptr) (ptr)
+#    define png_strcpy  strcpy
+#    define png_strncpy strncpy     /* Added to v 1.2.6 */
+#    define png_strlen  strlen
+#    define png_memcmp  memcmp      /* SJT: added */
+#    define png_memcpy  memcpy
+#    define png_memset  memset
+#    define png_sprintf sprintf
+#  endif
 #endif
+/* End of memory model/platform independent support */

-/* Just a little check that someone hasn't tried to define something
- * contradictory.
- */
-#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
-#  undef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 65536L
+#ifndef PNG_NO_SNPRINTF
+#  ifdef _MSC_VER
+#    define png_snprintf _snprintf   /* Added to v 1.2.19 */
+#    define png_snprintf2 _snprintf
+#    define png_snprintf6 _snprintf
+#  else
+#    define png_snprintf snprintf   /* Added to v 1.2.19 */
+#    define png_snprintf2 snprintf
+#    define png_snprintf6 snprintf
+#  endif
+#else
+  /* You don't have or don't want to use snprintf().  Caution: Using
+   * sprintf instead of snprintf exposes your application to accidental
+   * or malevolent buffer overflows.  If you don't have snprintf()
+   * as a general rule you should provide one (you can get one from
+   * Portable OpenSSH).
+   */
+#  define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1)
+#  define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2)
+#  define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
+      png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
 #endif
+/* End of 1.5.0beta36 move from pngconf.h */
+
+/* CONSTANTS and UTILITY MACROS
+ * These are used internally by libpng and not exposed in the API
+ */

 /* Various modes of operation.  Note that after an init, mode is set to
 * zero automatically when the structure is created.
@@ -234,6 +277,7 @@
 #define PNG_BACKGROUND_IS_GRAY     0x800
 #define PNG_HAVE_PNG_SIGNATURE    0x1000
 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
+#define PNG_ZLIB_READY_FOR_ZTXT   0x4000 /* 1: ready for ZTXT; 0: for IDAT */

 /* Flags for the transformations the PNG library does on the image data */
 #define PNG_BGR                 0x0001
@@ -245,7 +289,7 @@
 #define PNG_QUANTIZE            0x0040
 #define PNG_BACKGROUND          0x0080
 #define PNG_BACKGROUND_EXPAND   0x0100
-                          /*    0x0200 unused */
+#define PNG_EXPAND_16           0x0200     /* Added to libpng 1.5.2 */
 #define PNG_16_TO_8             0x0400
 #define PNG_RGBA                0x0800
 #define PNG_EXPAND              0x1000
@@ -274,9 +318,7 @@
 #define PNG_STRUCT_INFO  0x0002

 /* Scaling factor for filter heuristic weighting calculations */
-#define PNG_WEIGHT_SHIFT 8
 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
-#define PNG_COST_SHIFT 3
 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))

 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
@@ -301,16 +343,16 @@
 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
 #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
-#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
-#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
+                                  /*      0x200000L  unused */
+                                  /*      0x400000L  unused */
 #define PNG_FLAG_BENIGN_ERRORS_WARN       0x800000L  /* Added to libpng-1.4.0 */
-                                  /*     0x1000000L  unused */
-                                  /*     0x2000000L  unused */
-                                  /*     0x4000000L  unused */
-                                  /*     0x8000000L  unused */
-                                  /*    0x10000000L  unused */
-                                  /*    0x20000000L  unused */
-                                  /*    0x40000000L  unused */
+#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY    0x1000000L  /* 5 lines added */
+#define PNG_FLAG_ZTXT_CUSTOM_LEVEL       0x2000000L  /* to libpng-1.5.3 */
+#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL   0x4000000L
+#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000L
+#define PNG_FLAG_ZTXT_CUSTOM_METHOD      0x10000000L
+                                  /*     0x20000000L  unused */
+                                  /*     0x40000000L  unused */

 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
@@ -321,6 +363,18 @@
 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
                                     PNG_FLAG_CRC_CRITICAL_MASK)

+/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
+ * can handle at once.  This type need be no larger than 16 bits (so maximum of
+ * 65535), this define allows us to discover how big it is, but limited by the
+ * maximuum for png_size_t.  The value can be overriden in a library build
+ * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
+ * lower value (e.g. 255 works).  A lower value may help memory usage (slightly)
+ * and may even improve performance on some systems (and degrade it on others.)
+ */
+#ifndef ZLIB_IO_MAX
+#  define ZLIB_IO_MAX ((uInt)-1)
+#endif
+
 /* Save typing and make code easier to understand */

 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
@@ -341,6 +395,45 @@
 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
   ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )

+/* Conversions between fixed and floating point, only defined if
+ * required (to make sure the code doesn't accidentally use float
+ * when it is supposedly disabled.)
+ */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+/* The floating point conversion can't overflow, though it can and
+ * does lose accuracy relative to the original fixed point value.
+ * In practice this doesn't matter because png_fixed_point only
+ * stores numbers with very low precision.  The png_ptr and s
+ * arguments are unused by default but are there in case error
+ * checking becomes a requirement.
+ */
+#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
+
+/* The fixed point conversion performs range checking and evaluates
+ * its argument multiple times, so must be used with care.  The
+ * range checking uses the PNG specification values for a signed
+ * 32 bit fixed point value except that the values are deliberately
+ * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
+ * (2^31-1) * 100000). 's' is a string that describes the value being
+ * converted.
+ *
+ * NOTE: this macro will raise a png_error if the range check fails,
+ * therefore it is normally only appropriate to use this on values
+ * that come from API calls or other sources where an out of range
+ * error indicates a programming error, not a data error!
+ *
+ * NOTE: by default this is off - the macro is not used - because the
+ * function call saves a lot of code.
+ */
+#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
+#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
+    ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
+#else
+PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
+   png_const_charp text));
+#endif
+#endif
+
 /* Constant strings for known chunk types.  If you need to add a chunk,
 * define the name here, and add an invocation of the macro wherever it's
 * needed.
@@ -381,13 +474,15 @@ extern "C" {
 */

 /* Allocate memory for an internal libpng struct */
-PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
+PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),
+   PNG_ALLOCATED);

 /* Free memory from internal libpng struct */
 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));

-PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
-    malloc_fn, png_voidp mem_ptr));
+PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2,
+   PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)),
+   PNG_ALLOCATED);
 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
    png_free_ptr free_fn, png_voidp mem_ptr));

@@ -396,14 +491,15 @@ PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
    png_infop info_ptr));

 /* Function to allocate memory for zlib.  PNGAPI is disallowed. */
-PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
+PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items,
+   uInt size)),PNG_ALLOCATED);

 /* Function to free memory for zlib.  PNGAPI is disallowed. */
 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));

 /* Next four functions are used internally as callbacks.  PNGCBAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3, changed to PNGCBAPI
- * at 1.5.0
+ * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3, changed to
+ * PNGCBAPI at 1.5.0
 */

 PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,
@@ -427,8 +523,11 @@ PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));

 /* Write the "data" buffer to whatever output you are using */
-PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
-    png_size_t length));
+PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr,
+    png_const_bytep data, png_size_t length));
+
+/* Read and check the PNG file signature */
+PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));

 /* Read the chunk header (length + type name) */
 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
@@ -459,8 +558,8 @@ PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
 * passing a maximum of 64K on systems that have this as a memory limit,
 * since this is the maximum buffer size we can specify.
 */
-PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
-    png_size_t length));
+PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr,
+    png_const_bytep ptr, png_size_t length));

 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
@@ -476,8 +575,8 @@ PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
    int bit_depth, int color_type, int compression_method, int filter_method,
    int interlace_method));

-PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
-    png_uint_32 num_pal));
+PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr,
+    png_const_colorp palette, png_uint_32 num_pal));

 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
    png_size_t length));
@@ -495,8 +594,8 @@ PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
 #endif

 #ifdef PNG_WRITE_sBIT_SUPPORTED
-PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
-    int color_type));
+PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr,
+    png_const_color_8p sbit, int color_type));
 #endif

 #ifdef PNG_WRITE_cHRM_SUPPORTED
@@ -520,56 +619,57 @@ PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,

 #ifdef PNG_WRITE_iCCP_SUPPORTED
 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
-    png_charp name, int compression_type,
-    png_charp profile, int proflen));
+    png_const_charp name, int compression_type,
+    png_const_charp profile, int proflen));
   /* Note to maintainer: profile should be png_bytep */
 #endif

 #ifdef PNG_WRITE_sPLT_SUPPORTED
 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
-    png_sPLT_tp palette));
+    png_const_sPLT_tp palette));
 #endif

 #ifdef PNG_WRITE_tRNS_SUPPORTED
-PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
-    png_color_16p values, int number, int color_type));
+PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr,
+    png_const_bytep trans, png_const_color_16p values, int number,
+    int color_type));
 #endif

 #ifdef PNG_WRITE_bKGD_SUPPORTED
 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
-    png_color_16p values, int color_type));
+    png_const_color_16p values, int color_type));
 #endif

 #ifdef PNG_WRITE_hIST_SUPPORTED
-PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
-    int num_hist));
+PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,
+    png_const_uint_16p hist, int num_hist));
 #endif

 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
-    png_charp key, png_charpp new_key));
+    png_const_charp key, png_charpp new_key));
 #endif

 #ifdef PNG_WRITE_tEXt_SUPPORTED
-PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
-    png_charp text, png_size_t text_len));
+PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key,
+    png_const_charp text, png_size_t text_len));
 #endif

 #ifdef PNG_WRITE_zTXt_SUPPORTED
-PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
-    png_charp text, png_size_t text_len, int compression));
+PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key,
+    png_const_charp text, png_size_t text_len, int compression));
 #endif

 #ifdef PNG_WRITE_iTXt_SUPPORTED
 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
-    int compression, png_charp key, png_charp lang, png_charp lang_key,
-    png_charp text));
+    int compression, png_const_charp key, png_const_charp lang,
+    png_const_charp lang_key, png_const_charp text));
 #endif

 #ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
-    png_infop info_ptr, png_textp text_ptr, int num_text));
+    png_infop info_ptr, png_const_textp text_ptr, int num_text));
 #endif

 #ifdef PNG_WRITE_oFFs_SUPPORTED
@@ -580,7 +680,7 @@ PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
 #ifdef PNG_WRITE_pCAL_SUPPORTED
 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
    png_int_32 X0, png_int_32 X1, int type, int nparams,
-    png_charp units, png_charpp params));
+    png_const_charp units, png_charpp params));
 #endif

 #ifdef PNG_WRITE_pHYs_SUPPORTED
@@ -591,19 +691,12 @@ PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,

 #ifdef PNG_WRITE_tIME_SUPPORTED
 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
-    png_timep mod_time));
+    png_const_timep mod_time));
 #endif

 #ifdef PNG_WRITE_sCAL_SUPPORTED
-#  if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
-PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
-    int unit, double width, double height));
-#  else
-#    ifdef PNG_FIXED_POINT_SUPPORTED
 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
-    int unit, png_charp width, png_charp height));
-#    endif
-#  endif
+    int unit, png_const_charp width, png_const_charp height));
 #endif

 /* Called when finished processing a row of data */
@@ -612,11 +705,6 @@ PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
 /* Internal use only.   Called before first row of data */
 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));

-#ifdef PNG_READ_GAMMA_SUPPORTED
-PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
-    png_byte bit_depth));
-#endif
-
 /* Combine a row of data, dealing with alpha, etc. if requested */
 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
    int mask));
@@ -640,7 +728,8 @@ PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,

 /* Unfilter a row */
 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
-    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
+    png_row_infop row_info, png_bytep row, png_const_bytep prev_row,
+    int filter));

 /* Choose the best filter to use and filter the row data */
 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
@@ -686,22 +775,26 @@ PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,

 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
-    png_bytep row, png_uint_32 flags));
+PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info,
+    png_bytep row, int at_start));
 #endif

+#ifdef PNG_16BIT_SUPPORTED
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
+    png_bytep row));
+#endif
 #endif

 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
-    row_info, png_bytep row));
+PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr,
+    png_row_infop row_info, png_bytep row));
 #endif

 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
@@ -710,25 +803,29 @@ PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
 #endif

 #ifdef PNG_READ_PACK_SUPPORTED
-PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 #ifdef PNG_READ_SHIFT_SUPPORTED
-PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
-    png_color_8p sig_bits));
+PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_color_8p sig_bits));
 #endif

 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 #ifdef PNG_READ_16_TO_8_SUPPORTED
-PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 #ifdef PNG_READ_QUANTIZE_SUPPORTED
 PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
-    png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
+    png_bytep row, png_const_bytep palette_lookup,
+    png_const_bytep quantize_lookup));

 #  ifdef PNG_CORRECT_PALETTE_SUPPORTED
 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
@@ -737,7 +834,8 @@ PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
 #endif

 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
+PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 #ifdef PNG_WRITE_PACK_SUPPORTED
@@ -746,35 +844,43 @@ PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
 #endif

 #ifdef PNG_WRITE_SHIFT_SUPPORTED
-PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
-    png_color_8p bit_depth));
+PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_color_8p bit_depth));
 #endif

 #ifdef PNG_READ_BACKGROUND_SUPPORTED
 #  ifdef PNG_READ_GAMMA_SUPPORTED
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-    png_color_16p trans_color, png_color_16p background,
-    png_color_16p background_1,
-    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
-    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
-    png_uint_16pp gamma_16_to_1, int gamma_shift));
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_color_16p trans_color,
+    png_const_color_16p background, png_const_color_16p background_1,
+    png_const_bytep gamma_table, png_const_bytep gamma_from_1,
+    png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16,
+    png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1,
+    int gamma_shift));
 #  else
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-    png_color_16p trans_color, png_color_16p background));
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_color_16p trans_color,
+    png_const_color_16p background));
 #  endif
 #endif

 #ifdef PNG_READ_GAMMA_SUPPORTED
-PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
-    png_bytep gamma_table, png_uint_16pp gamma_16_table,
-    int gamma_shift));
+PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep gamma_table,
+    png_const_uint_16pp gamma_16_table, int gamma_shift));
 #endif

 #ifdef PNG_READ_EXPAND_SUPPORTED
 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
-    png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
+    png_bytep row, png_const_colorp palette, png_const_bytep trans,
+    int num_trans));
 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
-    png_bytep row, png_color_16p trans_value));
+    png_bytep row, png_const_color_16p trans_color));
+#endif
+
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info,
+    png_bytep row));
 #endif

 /* The following decodes the appropriate chunks, and does error correction,
@@ -810,7 +916,7 @@ PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
 #endif

 #ifdef PNG_READ_iCCP_SUPPORTED
-extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
+PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_uint_32 length));
 #endif /* PNG_READ_iCCP_SUPPORTED */

@@ -845,7 +951,7 @@ PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
 #endif

 #ifdef PNG_READ_sPLT_SUPPORTED
-extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
+PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_uint_32 length));
 #endif /* PNG_READ_sPLT_SUPPORTED */

@@ -878,7 +984,7 @@ PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_uint_32 length));

 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
-    png_bytep chunk_name));
+    png_const_bytep chunk_name));

 /* Handle the transformations for reading and writing */
 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
@@ -943,7 +1049,7 @@ PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
 #endif

 /* Added at libpng version 1.4.0 */
-#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_CHECK_cHRM_SUPPORTED
 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
    png_fixed_point int_white_x, png_fixed_point int_white_y,
    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
@@ -951,12 +1057,11 @@ PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
    png_fixed_point int_blue_y));
 #endif

-#ifdef PNG_cHRM_SUPPORTED
-#  ifdef PNG_CHECK_cHRM_SUPPORTED
+#ifdef PNG_CHECK_cHRM_SUPPORTED
 /* Added at libpng version 1.2.34 and 1.4.0 */
+/* Currently only used by png_check_cHRM_fixed */
 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
    unsigned long *hi_product, unsigned long *lo_product));
-#  endif
 #endif

 /* Added at libpng version 1.4.0 */
@@ -966,21 +1071,175 @@ PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
    int filter_type));

 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */
-extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
-    png_infop end_info_ptr));
+PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,
+    png_infop info_ptr, png_infop end_info_ptr));

 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
-extern void png_write_destroy PNGARG((png_structp png_ptr));
+PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));

 #ifdef USE_FAR_KEYWORD  /* memory model conversion function */
-extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
+PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
    int check));
 #endif /* USE_FAR_KEYWORD */

-#include "pngdebug.h"
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
+PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,
+   png_const_charp name),PNG_NORETURN);
+#endif
+
+/* ASCII to FP interfaces, currently only implemented if sCAL
+ * support is required.
+ */
+#if defined(PNG_READ_sCAL_SUPPORTED)
+/* MAX_DIGITS is actually the maximum number of characters in an sCAL
+ * width or height, derived from the precision (number of significant
+ * digits - a build time settable option) and assumpitions about the
+ * maximum ridiculous exponent.
+ */
+#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,
+    png_size_t size, double fp, unsigned int precision));
+#endif /* FLOATING_POINT */
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,
+    png_charp ascii, png_size_t size, png_fixed_point fp));
+#endif /* FIXED_POINT */
+#endif /* READ_sCAL */
+
+#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
+/* An internal API to validate the format of a floating point number.
+ * The result is the index of the next character.  If the number is
+ * not valid it will be the index of a character in the supposed number.
+ *
+ * The format of a number is defined in the PNG extensions specification
+ * and this API is strictly conformant to that spec, not anyone elses!
+ *
+ * The format as a regular expression is:
+ *
+ * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
+ *
+ * or:
+ *
+ * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
+ *
+ * The complexity is that either integer or fraction must be present and the
+ * fraction is permitted to have no digits only if the integer is present.
+ *
+ * NOTE: The dangling E problem.
+ *   There is a PNG valid floating point number in the following:
+ *
+ *       PNG floating point numb1.ers are not greedy.
+ *
+ *   Working this out requires *TWO* character lookahead (because of the
+ *   sign), the parser does not do this - it will fail at the 'r' - this
+ *   doesn't matter for PNG sCAL chunk values, but it requires more care
+ *   if the value were ever to be embedded in something more complex.  Use
+ *   ANSI-C strtod if you need the lookahead.
+ */
+/* State table for the parser. */
+#define PNG_FP_INTEGER    0  /* before or in integer */
+#define PNG_FP_FRACTION   1  /* before or in fraction */
+#define PNG_FP_EXPONENT   2  /* before or in exponent */
+#define PNG_FP_STATE      3  /* mask for the above */
+#define PNG_FP_SAW_SIGN   4  /* Saw +/- in current state */
+#define PNG_FP_SAW_DIGIT  8  /* Saw a digit in current state */
+#define PNG_FP_SAW_DOT   16  /* Saw a dot in current state */
+#define PNG_FP_SAW_E     32  /* Saw an E (or e) in current state */
+#define PNG_FP_SAW_ANY   60  /* Saw any of the above 4 */
+#define PNG_FP_WAS_VALID 64  /* Preceding substring is a valid fp number */
+#define PNG_FP_INVALID  128  /* Available for callers as a distinct value */
+
+/* Result codes for the parser (boolean - true meants ok, false means
+ * not ok yet.)
+ */
+#define PNG_FP_MAYBE      0  /* The number may be valid in the future */
+#define PNG_FP_OK         1  /* The number is valid */
+
+/* The actual parser.  This can be called repeatedly, it updates
+ * the index into the string and the state variable (which must
+ * be initialzed to 0).  It returns a result code, as above.  There
+ * is no point calling the parser any more if it fails to advance to
+ * the end of the string - it is stuck on an invalid character (or
+ * terminated by '\0').
+ *
+ * Note that the pointer will consume an E or even an E+ then leave
+ * a 'maybe' state even though a preceding integer.fraction is valid.
+ * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
+ * a valid number.  It's possible to recover from this by calling
+ * the parser again (from the start, with state 0) but with a string
+ * that omits the last character (i.e. set the size to the index of
+ * the problem character.)  This has not been tested within libpng.
+ */
+PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string,
+    png_size_t size, int *statep, png_size_tp whereami));
+
+/* This is the same but it checks a complete string and returns true
+ * only if it just contains a floating point number.
+ */
+PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,
+    png_size_t size));
+#endif /* pCAL || sCAL */
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
+    defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
+/* Added at libpng version 1.5.0 */
+/* This is a utility to provide a*times/div (rounded) and indicate
+ * if there is an overflow.  The result is a boolean - false (0)
+ * for overflow, true (1) if no overflow, in which case *res
+ * holds the result.
+ */
+PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
+    png_int_32 multiplied_by, png_int_32 divided_by));
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
+/* Same deal, but issue a warning on overflow and return 0. */
+PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,
+    png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by));
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* Calculate a reciprocal - used for gamma values.  This returns
+ * 0 if the argument is 0 in order to maintain an undefined value,
+ * there are no warnings.
+ */
+PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));
+
+/* The same but gives a reciprocal of the product of two fixed point
+ * values.  Accuracy is suitable for gamma calculations but this is
+ * not exact - use png_muldiv for that.
+ */
+PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
+    png_fixed_point b));
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* Internal fixed point gamma correction.  These APIs are called as
+ * required to convert single values - they don't need to be fast,
+ * they are not used when processing image pixel values.
+ *
+ * While the input is an 'unsigned' value it must actually be the
+ * correct bit value - 0..255 or 0..65535 as required.
+ */
+PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,
+    unsigned int value, png_fixed_point gamma_value));
+PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value));
+PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,
+    png_fixed_point gamma_value));
+PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
+    png_fixed_point gamma_value));
+PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
+    int bit_depth));
+#endif

 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */

+
+#include "pngdebug.h"
+
 #ifdef __cplusplus
 }
 #endif
--- a/pngread.c
+++ b/pngread.c
@@ -1,8 +1,8 @@

 /* pngread.c - read a PNG file
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.2 [March 31, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -19,9 +19,9 @@
 #ifdef PNG_READ_SUPPORTED

 /* Create a PNG structure for reading, and allocate any memory needed. */
-png_structp PNGAPI
-png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn)
+PNG_FUNCTION(png_structp,PNGAPI
+png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
 {

 #ifdef PNG_USER_MEM_SUPPORTED
@@ -32,10 +32,10 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 /* Alternate create PNG structure for reading, and allocate any memory
 * needed.
 */
-png_structp PNGAPI
-png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+PNG_FUNCTION(png_structp,PNGAPI
+png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */

@@ -228,36 +228,12 @@ void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
   png_debug(1, "in png_read_info");
- 
+
   if (png_ptr == NULL || info_ptr == NULL)
      return;
- 
-   /* If we haven't checked all of the PNG signature bytes, do so now. */
-   if (png_ptr->sig_bytes < 8)
-   {
-      png_size_t num_checked = png_ptr->sig_bytes,
-                 num_to_check = 8 - num_checked;

-#ifdef PNG_IO_STATE_SUPPORTED
-      png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE;
-#endif
-
-      png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
-      png_ptr->sig_bytes = 8;
-
-      if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
-      {
-         if (num_checked < 4 &&
-             png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
-            png_error(png_ptr, "Not a PNG file");
-
-         else
-            png_error(png_ptr, "PNG file corrupted by ASCII conversion");
-      }
-
-      if (num_checked < 3)
-         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
-   }
+   /* Read and check the PNG file signature. */
+   png_read_sig(png_ptr, info_ptr);

   for (;;)
   {
@@ -469,7 +445,7 @@ void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
   png_debug(1, "in png_read_update_info");
- 
+
   if (png_ptr == NULL)
      return;

@@ -494,12 +470,16 @@ void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
   png_debug(1, "in png_start_read_image");
- 
+
   if (png_ptr == NULL)
      return;

   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
      png_read_start_row(png_ptr);
+   else
+      png_warning(png_ptr,
+          "Ignoring extra png_start_read_image() call;"
+          " row buffer not reallocated");
 }
 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

@@ -508,16 +488,18 @@ void PNGAPI
 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 {
   PNG_IDAT;
+#ifdef PNG_READ_INTERLACING_SUPPORTED
   PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
       0xff};
   PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+#endif
   int ret;
- 
+
   if (png_ptr == NULL)
      return;
- 
+
   png_debug2(1, "in png_read_row (row %lu, pass %d)",
-       (unsigned long) png_ptr->row_number, png_ptr->pass);
+       (unsigned long)png_ptr->row_number, png_ptr->pass);

   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
      png_read_start_row(png_ptr);
@@ -638,6 +620,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
            }
            break;

+         default:
         case 6:
            if (!(png_ptr->row_number & 1))
            {
@@ -721,7 +704,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 #endif


-   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
+   if (png_ptr->transformations)
      png_do_read_transformations(png_ptr);

 #ifdef PNG_READ_INTERLACING_SUPPORTED
@@ -793,7 +776,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
   png_bytepp dp;

   png_debug(1, "in png_read_rows");
- 
+
   if (png_ptr == NULL)
      return;

@@ -847,12 +830,36 @@ png_read_image(png_structp png_ptr, png_bytepp image)
   png_bytepp rp;

   png_debug(1, "in png_read_image");
- 
+
   if (png_ptr == NULL)
      return;

 #ifdef PNG_READ_INTERLACING_SUPPORTED
-   pass = png_set_interlace_handling(png_ptr);
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+   {
+      pass = png_set_interlace_handling(png_ptr);
+      /* And make sure transforms are initialized. */
+      png_start_read_image(png_ptr);
+   }
+   else
+   {
+      if (png_ptr->interlaced && !(png_ptr->transformations & PNG_INTERLACE))
+      {
+         /* Caller called png_start_read_image or png_read_update_info without
+          * first turning on the PNG_INTERLACE transform.  We can fix this here,
+          * but the caller should do it!
+          */
+         png_warning(png_ptr, "Interlace handling should be turned on when "
+            "using png_read_image");
+         /* Make sure this is set correctly */
+         png_ptr->num_rows = png_ptr->height;
+      }
+
+      /* Obtain the pass number, which also turns on the PNG_INTERLACE flag in
+       * the above error case.
+       */
+      pass = png_set_interlace_handling(png_ptr);
+   }
 #else
   if (png_ptr->interlaced)
      png_error(png_ptr,
@@ -861,9 +868,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
   pass = 1;
 #endif

-
   image_height=png_ptr->height;
-   png_ptr->num_rows = image_height; /* Make sure this is set correctly */

   for (j = 0; j < pass; j++)
   {
@@ -886,7 +891,7 @@ void PNGAPI
 png_read_end(png_structp png_ptr, png_infop info_ptr)
 {
   png_debug(1, "in png_read_end");
- 
+
   if (png_ptr == NULL)
      return;

@@ -1089,7 +1094,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 #endif

   png_debug(1, "in png_destroy_read_struct");
- 
+
   if (png_ptr_ptr != NULL)
      png_ptr = *png_ptr_ptr;
   if (png_ptr == NULL)
@@ -1165,7 +1170,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
 #endif

   png_debug(1, "in png_read_destroy");
- 
+
   if (info_ptr != NULL)
      png_info_destroy(png_ptr, info_ptr);

@@ -1308,7 +1313,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 {
   int row;

-   if (png_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
      return;

   /* png_read_info() gives us all of the information from the
@@ -1423,6 +1428,11 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,

   /* We don't handle adding filler bytes */

+   /* We use png_read_image and rely on that for interlace handling, but we also
+    * call png_read_update_info therefore must turn on interlace handling now:
+    */
+   (void)png_set_interlace_handling(png_ptr);
+
   /* Optional call to gamma correct and add the background to the palette
    * and update info structure.  REQUIRED if you are expecting libpng to
    * update the palette for you (i.e., you selected such a transform above).
@@ -1454,8 +1464,8 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
   png_read_end(png_ptr, info_ptr);

-   transforms = transforms; /* Quiet compiler warnings */
-   params = params;
+   PNG_UNUSED(transforms)   /* Quiet compiler warnings */
+   PNG_UNUSED(params)

 }
 #endif /* PNG_INFO_IMAGE_SUPPORTED */
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,8 +1,8 @@

 /* pngrio.c - functions for data input
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -32,7 +32,7 @@ void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_debug1(4, "reading %d bytes", (int)length);
- 
+
   if (png_ptr->read_data_fn != NULL)
      (*(png_ptr->read_data_fn))(png_ptr, data, length);

@@ -103,10 +103,13 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
         read = MIN(NEAR_BUF_SIZE, remaining);
         err = fread(buf, 1, read, io_ptr);
         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
+
         if (err != read)
            break;
+
         else
            check += err;
+
         data += read;
         remaining -= read;
      }
@@ -123,9 +126,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 * for libpng if standard C streams aren't being used.
 *
 * This function takes as its arguments:
+ *
 * png_ptr      - pointer to a png input data structure
+ *
 * io_ptr       - pointer to user supplied structure containing info about
 *                the input functions.  May be NULL.
+ *
 * read_data_fn - pointer to a new input function that takes as its
 *                arguments a pointer to a png_struct, a pointer to
 *                a location where input data can be stored, and a 32-bit
--- a/pngrtran.c
+++ b/pngrtran.c
--- a/pngrutil.c
+++ b/pngrutil.c
--- a/pngset.c
+++ b/pngset.c
@@ -1,8 +1,8 @@

 /* pngset.c - storage of image information into info struct
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.1 [February 3, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -22,7 +22,8 @@

 #ifdef PNG_bKGD_SUPPORTED
 void PNGAPI
-png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
+png_set_bKGD(png_structp png_ptr, png_infop info_ptr,
+    png_const_color_16p background)
 {
   png_debug1(1, "in %s storage function", "bKGD");

@@ -35,41 +36,7 @@ png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
 #endif

 #ifdef PNG_cHRM_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
-    double white_x, double white_y, double red_x, double red_y,
-    double green_x, double green_y, double blue_x, double blue_y)
-{
-   png_debug1(1, "in %s storage function", "cHRM");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->x_white = (float)white_x;
-   info_ptr->y_white = (float)white_y;
-   info_ptr->x_red   = (float)red_x;
-   info_ptr->y_red   = (float)red_y;
-   info_ptr->x_green = (float)green_x;
-   info_ptr->y_green = (float)green_y;
-   info_ptr->x_blue  = (float)blue_x;
-   info_ptr->y_blue  = (float)blue_y;
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   info_ptr->int_x_white = (png_fixed_point)(white_x*100000. + 0.5);
-   info_ptr->int_y_white = (png_fixed_point)(white_y*100000. + 0.5);
-   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000. + 0.5);
-   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000. + 0.5);
-   info_ptr->int_x_green = (png_fixed_point)(green_x*100000. + 0.5);
-   info_ptr->int_y_green = (png_fixed_point)(green_y*100000. + 0.5);
-   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000. + 0.5);
-   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000. + 0.5);
-#endif
-   info_ptr->valid |= PNG_INFO_cHRM;
-}
-#endif /* PNG_FLOATING_POINT_SUPPORTED */
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-void PNGAPI
+void PNGFAPI
 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
@@ -80,111 +47,83 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr == NULL || info_ptr == NULL)
      return;

-#ifdef PNG_CHECK_cHRM_SUPPORTED
+#  ifdef PNG_CHECK_cHRM_SUPPORTED
   if (png_check_cHRM_fixed(png_ptr,
       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
-#endif
+#  endif
   {
-      info_ptr->int_x_white = white_x;
-      info_ptr->int_y_white = white_y;
-      info_ptr->int_x_red   = red_x;
-      info_ptr->int_y_red   = red_y;
-      info_ptr->int_x_green = green_x;
-      info_ptr->int_y_green = green_y;
-      info_ptr->int_x_blue  = blue_x;
-      info_ptr->int_y_blue  = blue_y;
-#ifdef  PNG_FLOATING_POINT_SUPPORTED
-      info_ptr->x_white = (float)(white_x/100000.);
-      info_ptr->y_white = (float)(white_y/100000.);
-      info_ptr->x_red   = (float)(  red_x/100000.);
-      info_ptr->y_red   = (float)(  red_y/100000.);
-      info_ptr->x_green = (float)(green_x/100000.);
-      info_ptr->y_green = (float)(green_y/100000.);
-      info_ptr->x_blue  = (float)( blue_x/100000.);
-      info_ptr->y_blue  = (float)( blue_y/100000.);
-#endif
+      info_ptr->x_white = white_x;
+      info_ptr->y_white = white_y;
+      info_ptr->x_red   = red_x;
+      info_ptr->y_red   = red_y;
+      info_ptr->x_green = green_x;
+      info_ptr->y_green = green_y;
+      info_ptr->x_blue  = blue_x;
+      info_ptr->y_blue  = blue_y;
      info_ptr->valid |= PNG_INFO_cHRM;
   }
 }
-#endif /* PNG_FIXED_POINT_SUPPORTED */
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
+    double white_x, double white_y, double red_x, double red_y,
+    double green_x, double green_y, double blue_x, double blue_y)
+{
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+      png_fixed(png_ptr, white_x, "cHRM White X"),
+      png_fixed(png_ptr, white_y, "cHRM White Y"),
+      png_fixed(png_ptr, red_x, "cHRM Red X"),
+      png_fixed(png_ptr, red_y, "cHRM Red Y"),
+      png_fixed(png_ptr, green_x, "cHRM Green X"),
+      png_fixed(png_ptr, green_y, "cHRM Green Y"),
+      png_fixed(png_ptr, blue_x, "cHRM Blue X"),
+      png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
+}
+#  endif /* PNG_FLOATING_POINT_SUPPORTED */
+
 #endif /* PNG_cHRM_SUPPORTED */

 #ifdef PNG_gAMA_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGFAPI
+png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
+    file_gamma)
+{
+   png_debug1(1, "in %s storage function", "gAMA");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   /* Previously these values were limited, however they must be
+    * wrong, therefore storing them (and setting PNG_INFO_gAMA)
+    * must be wrong too.
+    */
+   if (file_gamma > (png_fixed_point)PNG_UINT_31_MAX)
+      png_warning(png_ptr, "Gamma too large, ignored");
+
+   else if (file_gamma <= 0)
+      png_warning(png_ptr, "Negative or zero gamma ignored");
+
+   else
+   {
+      info_ptr->gamma = file_gamma;
+      info_ptr->valid |= PNG_INFO_gAMA;
+   }
+}
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
 void PNGAPI
 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 {
-   double png_gamma;
-
-   png_debug1(1, "in %s storage function", "gAMA");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   /* Check for overflow */
-   if (file_gamma > 21474.83)
-   {
-      png_warning(png_ptr, "Limiting gamma to 21474.83");
-      png_gamma = 21474.83;
-   }
-
-   else
-      png_gamma = file_gamma;
-
-   info_ptr->gamma = (float)png_gamma;
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   info_ptr->int_gamma = (int)(png_gamma*100000.+.5);
-#endif
-   info_ptr->valid |= PNG_INFO_gAMA;
-
-   if (png_gamma == 0.0)
-      png_warning(png_ptr, "Setting gamma = 0");
-}
-#endif
-void PNGAPI
-png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
-    int_gamma)
-{
-   png_fixed_point png_gamma;
-
-   png_debug1(1, "in %s storage function", "gAMA");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
-   {
-      png_warning(png_ptr, "Limiting gamma to 21474.83");
-      png_gamma = PNG_UINT_31_MAX;
-   }
-
-   else
-   {
-      if (int_gamma < 0)
-      {
-         png_warning(png_ptr, "Setting negative gamma to zero");
-         png_gamma = 0;
-      }
-
-      else
-         png_gamma = int_gamma;
-   }
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   info_ptr->gamma = (float)(png_gamma/100000.);
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   info_ptr->int_gamma = png_gamma;
-#endif
-   info_ptr->valid |= PNG_INFO_gAMA;
-
-   if (png_gamma == 0)
-      png_warning(png_ptr, "Setting gamma = 0");
+   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
+       "png_set_gAMA"));
 }
+#  endif
 #endif

 #ifdef PNG_hIST_SUPPORTED
 void PNGAPI
-png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist)
 {
   int i;

@@ -203,11 +142,13 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
   }

   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+
   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
    * version 1.2.1
    */
   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16));
+
   if (png_ptr->hist == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for hIST chunk data");
@@ -219,16 +160,15 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)

   info_ptr->hist = png_ptr->hist;
   info_ptr->valid |= PNG_INFO_hIST;
-
   info_ptr->free_me |= PNG_FREE_HIST;
 }
 #endif

 void PNGAPI
 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 width, png_uint_32 height, int bit_depth,
-   int color_type, int interlace_type, int compression_type,
-   int filter_type)
+    png_uint_32 width, png_uint_32 height, int bit_depth,
+    int color_type, int interlace_type, int compression_type,
+    int filter_type)
 {
   png_debug1(1, "in %s storage function", "IHDR");

@@ -262,12 +202,12 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);

   /* Check for potential overflow */
-   if (width > (PNG_UINT_32_MAX
-                 >> 3)      /* 8-byte RRGGBBAA pixels */
-                 - 64       /* bigrowbuf hack */
-                 - 1        /* filter byte */
-                 - 7*8      /* rounding of width to multiple of 8 pixels */
-                 - 8)       /* extra max_pixel_depth pad */
+   if (width >
+       (PNG_UINT_32_MAX >> 3)      /* 8-byte RRGGBBAA pixels */
+       - 48       /* bigrowbuf hack */
+       - 1        /* filter byte */
+       - 7*8      /* rounding of width to multiple of 8 pixels */
+       - 8)       /* extra max_pixel_depth pad */
      info_ptr->rowbytes = 0;
   else
      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
@@ -293,8 +233,8 @@ png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_pCAL_SUPPORTED
 void PNGAPI
 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
-    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
-    png_charp units, png_charpp params)
+    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
+    int nparams, png_const_charp units, png_charpp params)
 {
   png_size_t length;
   int i;
@@ -308,7 +248,19 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
   png_debug1(3, "allocating purpose for info (%lu bytes)",
       (unsigned long)length);

+   /* TODO: validate format of calibration name and unit name */
+
+   /* Check that the type matches the specification. */
+   if (type < 0 || type > 3)
+      png_error(png_ptr, "Invalid pCAL equation type");
+
+   /* Validate params[nparams] */
+   for (i=0; i<nparams; ++i)
+      if (!png_check_fp_string(params[i], png_strlen(params[i])))
+         png_error(png_ptr, "Invalid format for pCAL parameter");
+
   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
+
   if (info_ptr->pcal_purpose == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for pCAL purpose");
@@ -328,15 +280,17 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
     (unsigned long)length);

   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
+
   if (info_ptr->pcal_units == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for pCAL units");
      return;
   }
+
   png_memcpy(info_ptr->pcal_units, units, length);

   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
-      (png_size_t)((nparams + 1) * png_sizeof(png_charp)));
+       (png_size_t)((nparams + 1) * png_sizeof(png_charp)));

   if (info_ptr->pcal_params == NULL)
   {
@@ -350,7 +304,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
   {
      length = png_strlen(params[i]) + 1;
      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
-        (unsigned long)length);
+          (unsigned long)length);

      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);

@@ -368,78 +322,126 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #endif

-#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
-    int unit, double width, double height)
-{
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->scal_unit = (png_byte)unit;
-   info_ptr->scal_pixel_width = width;
-   info_ptr->scal_pixel_height = height;
-
-   info_ptr->valid |= PNG_INFO_sCAL;
-}
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#ifdef PNG_sCAL_SUPPORTED
 void PNGAPI
 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
-    int unit, png_charp swidth, png_charp sheight)
+    int unit, png_const_charp swidth, png_const_charp sheight)
 {
-   png_size_t length;
+   png_size_t lengthw = 0, lengthh = 0;

   png_debug1(1, "in %s storage function", "sCAL");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

+   /* Double check the unit (should never get here with an invalid
+    * unit unless this is an API call.)
+    */
+   if (unit != 1 && unit != 2)
+      png_error(png_ptr, "Invalid sCAL unit");
+
+   if (swidth == NULL || (lengthw = png_strlen(swidth)) <= 0 ||
+       swidth[0] == 45 /*'-'*/ || !png_check_fp_string(swidth, lengthw))
+      png_error(png_ptr, "Invalid sCAL width");
+
+   if (sheight == NULL || (lengthh = png_strlen(sheight)) <= 0 ||
+       sheight[0] == 45 /*'-'*/ || !png_check_fp_string(sheight, lengthh))
+      png_error(png_ptr, "Invalid sCAL height");
+
   info_ptr->scal_unit = (png_byte)unit;

-   length = png_strlen(swidth) + 1;
+   ++lengthw;

-   png_debug1(3, "allocating unit for info (%u bytes)",
-       (unsigned int)length);
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);

-   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
+   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw);

   if (info_ptr->scal_s_width == NULL)
   {
-      png_warning(png_ptr,
-         "Memory allocation failed while processing sCAL");
+      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
      return;
   }

-   png_memcpy(info_ptr->scal_s_width, swidth, length);
+   png_memcpy(info_ptr->scal_s_width, swidth, lengthw);

-   length = png_strlen(sheight) + 1;
+   ++lengthh;

-   png_debug1(3, "allocating unit for info (%u bytes)",
-      (unsigned int)length);
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);

-   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
+   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh);

   if (info_ptr->scal_s_height == NULL)
   {
      png_free (png_ptr, info_ptr->scal_s_width);
      info_ptr->scal_s_width = NULL;

-      png_warning(png_ptr,
-         "Memory allocation failed while processing sCAL");
-
+      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
      return;
   }

-   png_memcpy(info_ptr->scal_s_height, sheight, length);
+   png_memcpy(info_ptr->scal_s_height, sheight, lengthh);
+
   info_ptr->valid |= PNG_INFO_sCAL;
   info_ptr->free_me |= PNG_FREE_SCAL;
 }
-#endif
-#endif
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width,
+    double height)
+{
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   /* Check the arguments. */
+   if (width <= 0)
+      png_warning(png_ptr, "Invalid sCAL width ignored");
+
+   else if (height <= 0)
+      png_warning(png_ptr, "Invalid sCAL height ignored");
+
+   else
+   {
+      /* Convert 'width' and 'height' to ASCII. */
+      char swidth[PNG_sCAL_MAX_DIGITS+1];
+      char sheight[PNG_sCAL_MAX_DIGITS+1];
+
+      png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width,
+         PNG_sCAL_PRECISION);
+      png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height,
+         PNG_sCAL_PRECISION);
+
+      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
+   }
+}
+#  endif
+
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit,
+    png_fixed_point width, png_fixed_point height)
+{
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   /* Check the arguments. */
+   if (width <= 0)
+      png_warning(png_ptr, "Invalid sCAL width ignored");
+
+   else if (height <= 0)
+      png_warning(png_ptr, "Invalid sCAL height ignored");
+
+   else
+   {
+      /* Convert 'width' and 'height' to ASCII. */
+      char swidth[PNG_sCAL_MAX_DIGITS+1];
+      char sheight[PNG_sCAL_MAX_DIGITS+1];
+
+      png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width);
+      png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height);
+
+      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
+   }
+}
+#  endif
 #endif

 #ifdef PNG_pHYs_SUPPORTED
@@ -461,7 +463,7 @@ png_set_pHYs(png_structp png_ptr, png_infop info_ptr,

 void PNGAPI
 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
-    png_colorp palette, int num_palette)
+    png_const_colorp palette, int num_palette)
 {

   png_debug1(1, "in %s storage function", "PLTE");
@@ -506,7 +508,7 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_sBIT_SUPPORTED
 void PNGAPI
 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
-    png_color_8p sig_bit)
+    png_const_color_8p sig_bit)
 {
   png_debug1(1, "in %s storage function", "sBIT");

@@ -520,85 +522,41 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_sRGB_SUPPORTED
 void PNGAPI
-png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
+png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent)
 {
   png_debug1(1, "in %s storage function", "sRGB");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   info_ptr->srgb_intent = (png_byte)intent;
+   info_ptr->srgb_intent = (png_byte)srgb_intent;
   info_ptr->valid |= PNG_INFO_sRGB;
 }

 void PNGAPI
 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
-    int intent)
+    int srgb_intent)
 {
-#ifdef PNG_gAMA_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float file_gamma;
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   png_fixed_point int_file_gamma;
-#endif
-#endif
-#ifdef PNG_cHRM_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
-#endif
-   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
-       int_green_y, int_blue_x, int_blue_y;
-#endif
   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   png_set_sRGB(png_ptr, info_ptr, intent);
+   png_set_sRGB(png_ptr, info_ptr, srgb_intent);

-#ifdef PNG_gAMA_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   file_gamma = (float).45455;
-   png_set_gAMA(png_ptr, info_ptr, file_gamma);
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   int_file_gamma = 45455L;
-   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
-#endif
-#endif
+#  ifdef PNG_gAMA_SUPPORTED
+   png_set_gAMA_fixed(png_ptr, info_ptr, 45455L);
+#  endif

-#ifdef PNG_cHRM_SUPPORTED
-   int_white_x = 31270L;
-   int_white_y = 32900L;
-   int_red_x   = 64000L;
-   int_red_y   = 33000L;
-   int_green_x = 30000L;
-   int_green_y = 60000L;
-   int_blue_x  = 15000L;
-   int_blue_y  =  6000L;
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   white_x = (float).3127;
-   white_y = (float).3290;
-   red_x   = (float).64;
-   red_y   = (float).33;
-   green_x = (float).30;
-   green_y = (float).60;
-   blue_x  = (float).15;
-   blue_y  = (float).06;
-#endif
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#  ifdef PNG_cHRM_SUPPORTED
   png_set_cHRM_fixed(png_ptr, info_ptr,
-       int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
-       int_green_y, int_blue_x, int_blue_y);
-#endif
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   png_set_cHRM(png_ptr, info_ptr,
-       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
-#endif
-#endif /* cHRM */
+      /* color      x       y */
+      /* white */ 31270L, 32900L,
+      /* red   */ 64000L, 33000L,
+      /* green */ 30000L, 60000L,
+      /* blue  */ 15000L,  6000L
+   );
+#  endif /* cHRM */
 }
 #endif /* sRGB */

@@ -606,11 +564,11 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_iCCP_SUPPORTED
 void PNGAPI
 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
-    png_charp name, int compression_type,
-    png_charp profile, png_uint_32 proflen)
+    png_const_charp name, int compression_type,
+    png_const_bytep profile, png_uint_32 proflen)
 {
   png_charp new_iccp_name;
-   png_charp new_iccp_profile;
+   png_bytep new_iccp_profile;
   png_uint_32 length;

   png_debug1(1, "in %s storage function", "iCCP");
@@ -620,13 +578,15 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,

   length = png_strlen(name)+1;
   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
+
   if (new_iccp_name == NULL)
   {
        png_warning(png_ptr, "Insufficient memory to process iCCP chunk");
      return;
   }
+
   png_memcpy(new_iccp_name, name, length);
-   new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
+   new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen);

   if (new_iccp_profile == NULL)
   {
@@ -654,7 +614,7 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_TEXT_SUPPORTED
 void PNGAPI
-png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
+png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr,
    int num_text)
 {
   int ret;
@@ -665,14 +625,14 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 }

 int /* PRIVATE */
-png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
-    int num_text)
+png_set_text_2(png_structp png_ptr, png_infop info_ptr,
+    png_const_textp text_ptr, int num_text)
 {
   int i;

   png_debug1(1, "in %s storage function", ((png_ptr == NULL ||
-      png_ptr->chunk_name[0] == '\0') ?
-      "text" : (png_const_charp)png_ptr->chunk_name));
+       png_ptr->chunk_name[0] == '\0') ?
+       "text" : (png_const_charp)png_ptr->chunk_name));

   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
      return(0);
@@ -727,6 +687,13 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
      if (text_ptr[i].key == NULL)
          continue;

+      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
+          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
+      {
+         png_warning(png_ptr, "text compression mode is out of range");
+         continue;
+      }
+
      key_len = png_strlen(text_ptr[i].key);

      if (text_ptr[i].compression <= 0)
@@ -736,7 +703,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
      }

      else
-#ifdef PNG_iTXt_SUPPORTED
+#  ifdef PNG_iTXt_SUPPORTED
      {
         /* Set iTXt data */

@@ -752,22 +719,22 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
         else
            lang_key_len = 0;
      }
-#else /* PNG_iTXt_SUPPORTED */
+#  else /* PNG_iTXt_SUPPORTED */
      {
         png_warning(png_ptr, "iTXt chunk not supported");
         continue;
      }
-#endif
+#  endif

      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
      {
         text_length = 0;
-#ifdef PNG_iTXt_SUPPORTED
+#  ifdef PNG_iTXt_SUPPORTED
         if (text_ptr[i].compression > 0)
            textp->compression = PNG_ITXT_COMPRESSION_NONE;

         else
-#endif
+#  endif
            textp->compression = PNG_TEXT_COMPRESSION_NONE;
      }

@@ -784,10 +751,10 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
      if (textp->key == NULL)
         return(1);

-      png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
+      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
          (unsigned long)(png_uint_32)
          (key_len + lang_len + lang_key_len + text_length + 4),
-          (int)textp->key);
+          textp->key);

      png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
      *(textp->key + key_len) = '\0';
@@ -816,7 +783,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

      *(textp->text + text_length) = '\0';

-#ifdef PNG_iTXt_SUPPORTED
+#  ifdef PNG_iTXt_SUPPORTED
      if (textp->compression > 0)
      {
         textp->text_length = 0;
@@ -824,7 +791,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
      }

      else
-#endif
+#  endif
      {
         textp->text_length = text_length;
         textp->itxt_length = 0;
@@ -839,7 +806,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

 #ifdef PNG_tIME_SUPPORTED
 void PNGAPI
-png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
+png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)
 {
   png_debug1(1, "in %s storage function", "tIME");

@@ -855,7 +822,7 @@ png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 #ifdef PNG_tRNS_SUPPORTED
 void PNGAPI
 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
-    png_bytep trans_alpha, int num_trans, png_color_16p trans_color)
+    png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
 {
   png_debug1(1, "in %s storage function", "tRNS");

@@ -872,8 +839,8 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);

       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
-       png_ptr->trans_alpha = info_ptr->trans_alpha = (png_bytep)png_malloc(png_ptr,
-           (png_size_t)PNG_MAX_PALETTE_LENGTH);
+       png_ptr->trans_alpha = info_ptr->trans_alpha =
+           (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH);

       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
          png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
@@ -892,7 +859,8 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
         png_warning(png_ptr,
            "tRNS chunk has out-of-range samples for bit_depth");

-      png_memcpy(&(info_ptr->trans_color), trans_color, png_sizeof(png_color_16));
+      png_memcpy(&(info_ptr->trans_color), trans_color,
+         png_sizeof(png_color_16));

      if (num_trans == 0)
         num_trans = 1;
@@ -911,11 +879,12 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_sPLT_SUPPORTED
 void PNGAPI
 png_set_sPLT(png_structp png_ptr,
-    png_infop info_ptr, png_sPLT_tp entries, int nentries)
+    png_infop info_ptr, png_const_sPLT_tp entries, int nentries)
 /*
 *  entries        - array of png_sPLT_t structures
 *                   to be added to the list of palettes
 *                   in the info structure.
+ *
 *  nentries       - number of palette structures to be
 *                   added.
 */
@@ -928,7 +897,7 @@ png_set_sPLT(png_structp png_ptr,

   np = (png_sPLT_tp)png_malloc_warn(png_ptr,
       (info_ptr->splt_palettes_num + nentries) *
-        (png_size_t)png_sizeof(png_sPLT_t));
+       (png_size_t)png_sizeof(png_sPLT_t));

   if (np == NULL)
   {
@@ -945,7 +914,7 @@ png_set_sPLT(png_structp png_ptr,
   for (i = 0; i < nentries; i++)
   {
      png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
-      png_sPLT_tp from = entries + i;
+      png_const_sPLT_tp from = entries + i;
      png_uint_32 length;

      length = png_strlen(from->name) + 1;
@@ -988,7 +957,7 @@ png_set_sPLT(png_structp png_ptr,
 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
 void PNGAPI
 png_set_unknown_chunks(png_structp png_ptr,
-   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
+   png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
 {
   png_unknown_chunkp np;
   int i;
@@ -997,8 +966,8 @@ png_set_unknown_chunks(png_structp png_ptr,
      return;

   np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
-       (png_size_t)((info_ptr->unknown_chunks_num + num_unknowns) *
-       png_sizeof(png_unknown_chunk)));
+       (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) *
+       png_sizeof(png_unknown_chunk));

   if (np == NULL)
   {
@@ -1008,7 +977,8 @@ png_set_unknown_chunks(png_structp png_ptr,
   }

   png_memcpy(np, info_ptr->unknown_chunks,
-       info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
+       (png_size_t)info_ptr->unknown_chunks_num *
+       png_sizeof(png_unknown_chunk));

   png_free(png_ptr, info_ptr->unknown_chunks);
   info_ptr->unknown_chunks = NULL;
@@ -1016,12 +986,12 @@ png_set_unknown_chunks(png_structp png_ptr,
   for (i = 0; i < num_unknowns; i++)
   {
      png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
-      png_unknown_chunkp from = unknowns + i;
+      png_const_unknown_chunkp from = unknowns + i;

-      png_memcpy((png_charp)to->name, (png_charp)from->name,
-          png_sizeof(from->name));
+      png_memcpy(to->name, from->name, png_sizeof(from->name));
      to->name[png_sizeof(to->name)-1] = '\0';
      to->size = from->size;
+
      /* Note our location in the read or write sequence */
      to->location = (png_byte)(png_ptr->mode & 0xff);

@@ -1049,12 +1019,13 @@ png_set_unknown_chunks(png_structp png_ptr,
   info_ptr->unknown_chunks_num += num_unknowns;
   info_ptr->free_me |= PNG_FREE_UNKN;
 }
+
 void PNGAPI
 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
    int chunk, int location)
 {
   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
-       (int)info_ptr->unknown_chunks_num)
+       info_ptr->unknown_chunks_num)
      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
 #endif
@@ -1078,7 +1049,7 @@ png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)

 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 void PNGAPI
-png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_const_bytep
    chunk_list, int num_chunks)
 {
   png_bytep new_list, p;
@@ -1102,12 +1073,13 @@ png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep

      return;
   }
+
   if (chunk_list == NULL)
      return;
+
   old_num_chunks = png_ptr->num_chunk_list;
   new_list=(png_bytep)png_malloc(png_ptr,
-       (png_size_t)
-       (5*(num_chunks + old_num_chunks)));
+       (png_size_t)(5*(num_chunks + old_num_chunks)));

   if (png_ptr->chunk_list != NULL)
   {
@@ -1164,17 +1136,31 @@ png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
 #endif

 void PNGAPI
-png_set_compression_buffer_size(png_structp png_ptr,
-    png_size_t size)
+png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
 {
    if (png_ptr == NULL)
       return;

    png_free(png_ptr, png_ptr->zbuf);
-    png_ptr->zbuf_size = size;
+
+    if (size > ZLIB_IO_MAX)
+    {
+       png_warning(png_ptr, "Attempt to set buffer size beyond max ignored");
+       png_ptr->zbuf_size = ZLIB_IO_MAX;
+       size = ZLIB_IO_MAX; /* must fit */
+    }
+
+    else
+       png_ptr->zbuf_size = (uInt)size;
+
    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+
+    /* The following ensures a relatively safe failure if this gets called while
+     * the buffer is actually in use.
+     */
    png_ptr->zstream.next_out = png_ptr->zbuf;
-    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+    png_ptr->zstream.avail_out = 0;
+    png_ptr->zstream.avail_in = 0;
 }

 void PNGAPI
@@ -1215,11 +1201,10 @@ png_set_chunk_cache_max (png_structp png_ptr,
 /* This function was added to libpng 1.4.1 */
 void PNGAPI
 png_set_chunk_malloc_max (png_structp png_ptr,
-   png_alloc_size_t user_chunk_malloc_max)
+    png_alloc_size_t user_chunk_malloc_max)
 {
-    if (png_ptr)
-       png_ptr->user_chunk_malloc_max =
-          (png_size_t)user_chunk_malloc_max;
+   if (png_ptr)
+      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */

--- a/pngstruct.h
+++ b/pngstruct.h
@@ -1,11 +1,11 @@

 /* pngstruct.h - header file for PNG reference library
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
- * Last changed in libpng version 1.5.0 - June 22, 2010
+ * Last changed in libpng 1.5.0 [January 6, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -20,6 +20,12 @@

 #ifndef PNGSTRUCT_H
 #define PNGSTRUCT_H
+/* zlib.h defines the structure z_stream, an instance of which is included
+ * in this structure and is required for decompressing the LZ compressed
+ * data in PNG files.
+ */
+#include "zlib.h"
+
 struct png_struct_def
 {
 #ifdef PNG_SETJMP_SUPPORTED
@@ -57,12 +63,19 @@ struct png_struct_def

   z_stream zstream;          /* pointer to decompression structure (below) */
   png_bytep zbuf;            /* buffer for zlib */
-   png_size_t zbuf_size;      /* size of zbuf */
+   uInt zbuf_size;            /* size of zbuf (typically 65536) */
   int zlib_level;            /* holds zlib compression level */
   int zlib_method;           /* holds zlib compression method */
   int zlib_window_bits;      /* holds zlib compression window bits */
   int zlib_mem_level;        /* holds zlib compression memory level */
   int zlib_strategy;         /* holds zlib compression strategy */
+/* Added at libpng 1.5.3 */
+   int zlib_text_level;            /* holds zlib compression level */
+   int zlib_text_method;           /* holds zlib compression method */
+   int zlib_text_window_bits;      /* holds zlib compression window bits */
+   int zlib_text_mem_level;        /* holds zlib compression memory level */
+   int zlib_text_strategy;         /* holds zlib compression strategy */
+/* End of material added at libpng 1.5.3 */

   png_uint_32 width;         /* width of image in pixels */
   png_uint_32 height;        /* height of image in pixels */
@@ -104,9 +117,7 @@ struct png_struct_def

 #ifdef PNG_bKGD_SUPPORTED
   png_byte background_gamma_type;
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-   float background_gamma;
-#  endif
+   png_fixed_point background_gamma;
   png_color_16 background;   /* background color in screen gamma space */
 #ifdef PNG_READ_GAMMA_SUPPORTED
   png_color_16 background_1; /* background normalized to gamma 1.0 */
@@ -121,10 +132,8 @@ struct png_struct_def

 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float gamma;          /* file gamma value */
-   float screen_gamma;   /* screen gamma value (display_exponent) */
-#endif
+   png_fixed_point gamma;        /* file gamma value */
+   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
 #endif

 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
@@ -154,7 +163,7 @@ struct png_struct_def
   png_write_status_ptr write_row_fn; /* called after each row is encoded */
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
+   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
   png_progressive_end_ptr end_fn;   /* called after image is complete */
   png_bytep save_buffer_ptr;        /* current location in save_buffer */
   png_bytep save_buffer;            /* buffer for previously read data */
@@ -241,11 +250,6 @@ struct png_struct_def
   png_uint_32 mng_features_permitted;
 #endif

-/* New member added in libpng-1.0.7 */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_fixed_point int_gamma;
-#endif
-
 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
 #ifdef PNG_MNG_FEATURES_SUPPORTED
   png_byte filter_type;
@@ -287,7 +291,7 @@ struct png_struct_def
   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
    * can occupy when decompressed.  0 means unlimited.
    */
-   png_uint_32 user_chunk_malloc_max;
+   png_alloc_size_t user_chunk_malloc_max;
 #endif

 /* New member added in libpng-1.0.25 and 1.2.17 */
@@ -297,8 +301,8 @@ struct png_struct_def
 #endif

 /* New members added in libpng-1.2.26 */
-  png_uint_32 old_big_row_buf_size;
-  png_uint_32 old_prev_row_size;
+  png_size_t old_big_row_buf_size;
+  png_size_t old_prev_row_size;

 /* New member added in libpng-1.2.30 */
  png_charp chunkdata;  /* buffer for reading chunk data */
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,8 +1,8 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -31,6 +31,7 @@
 * of files at once by typing "pngtest -m file1.png file2.png ..."
 */

+#include "zlib.h"
 #include "png.h"
 /* Copied from pngpriv.h but only used in error messages below. */
 #ifndef PNG_ZBUF_SIZE
@@ -64,6 +65,17 @@ typedef FILE                * png_FILE_p;
 #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
 #endif

+/* The code uses memcmp and memcpy on large objects (typically row pointers) so
+ * it is necessary to do soemthing special on certain architectures, note that
+ * the actual support for this was effectively removed in 1.4, so only the
+ * memory remains in this program:
+ */
+#define CVT_PTR(ptr)         (ptr)
+#define CVT_PTR_NOCHECK(ptr) (ptr)
+#define png_memcmp  memcmp
+#define png_memcpy  memcpy
+#define png_memset  memset
+
 /* Turn on CPU timing
 #define PNGTEST_TIMING
 */
@@ -287,6 +299,48 @@ static int wrote_question = 0;
 * than changing the library.
 */

+#ifdef PNG_IO_STATE_SUPPORTED
+void
+pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+   png_uint_32 io_op);
+void
+pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+   png_uint_32 io_op)
+{
+   png_uint_32 io_state = png_get_io_state(png_ptr);
+   int err = 0;
+
+   /* Check if the current operation (reading / writing) is as expected. */
+   if ((io_state & PNG_IO_MASK_OP) != io_op)
+      png_error(png_ptr, "Incorrect operation in I/O state");
+
+   /* Check if the buffer size specific to the current location
+    * (file signature / header / data / crc) is as expected.
+    */
+   switch (io_state & PNG_IO_MASK_LOC)
+   {
+   case PNG_IO_SIGNATURE:
+      if (data_length > 8)
+         err = 1;
+      break;
+   case PNG_IO_CHUNK_HDR:
+      if (data_length != 8)
+         err = 1;
+      break;
+   case PNG_IO_CHUNK_DATA:
+      break;  /* no restrictions here */
+   case PNG_IO_CHUNK_CRC:
+      if (data_length != 4)
+         err = 1;
+      break;
+   default:
+      err = 1;  /* uninitialized */
+   }
+   if (err)
+      png_error(png_ptr, "Bad I/O state or buffer size");
+}
+#endif
+
 #ifndef USE_FAR_KEYWORD
 static void PNGCBAPI
 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -305,8 +359,12 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   if (check != length)
   {
-      png_error(png_ptr, "Read Error!");
+      png_error(png_ptr, "Read Error");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -354,7 +412,11 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
   }

   if (check != length)
-      png_error(png_ptr, "read Error");
+      png_error(png_ptr, "Read Error");
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #endif /* USE_FAR_KEYWORD */

@@ -363,7 +425,7 @@ static void PNGCBAPI
 pngtest_flush(png_structp png_ptr)
 {
   /* Do nothing; fflush() is said to be just a waste of energy. */
-   png_ptr = png_ptr;  /* Stifle compiler warning */
+   PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
 }
 #endif

@@ -384,6 +446,10 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   {
      png_error(png_ptr, "Write Error");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
+#endif
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -436,6 +502,10 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   {
      png_error(png_ptr, "Write Error");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
+#endif
 }
 #endif /* USE_FAR_KEYWORD */

@@ -843,6 +913,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #  endif
 #endif

+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
+   png_set_text_compression_strategy(write_ptr, Z_FILTERED);
+#endif
+
   if (status_dots_requested == 1)
   {
 #ifdef PNG_WRITE_SUPPORTED
@@ -957,7 +1031,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_iCCP_SUPPORTED
   {
      png_charp name;
-      png_charp profile;
+      png_bytep profile;
      png_uint_32 proflen;
      int compression_type;

@@ -1133,19 +1207,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
   {
      png_unknown_chunkp unknowns;
-      int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
         &unknowns);

      if (num_unknowns)
      {
-         png_size_t i;
+         int i;
         png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
           num_unknowns);
         /* Copy the locations from the read_info_ptr.  The automatically
          * generated locations in write_info_ptr are wrong because we
          * haven't written anything yet.
          */
-         for (i = 0; i < (png_size_t)num_unknowns; i++)
+         for (i = 0; i < num_unknowns; i++)
           png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
             unknowns[i].location);
      }
@@ -1306,21 +1380,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
   {
      png_unknown_chunkp unknowns;
-      int num_unknowns;
-
-      num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
         &unknowns);

      if (num_unknowns)
      {
-         png_size_t i;
+         int i;
         png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
           num_unknowns);
         /* Copy the locations from the read_info_ptr.  The automatically
          * generated locations in write_end_info_ptr are wrong because we
          * haven't written the end_info yet.
          */
-         for (i = 0; i < (png_size_t)num_unknowns; i++)
+         for (i = 0; i < num_unknowns; i++)
           png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
             unknowns[i].location);
      }
@@ -1587,7 +1659,7 @@ main(int argc, char *argv[])
            {
               fprintf(STDERR, " %lu bytes at %x\n",
                 (unsigned long)pinfo->size,
-                 (unsigned int) pinfo->pointer);
+                 (unsigned int)pinfo->pointer);
               pinfo = pinfo->next;
            }
         }
@@ -1716,4 +1788,4 @@ main(int argc, char *argv[])
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_5_0beta30 your_png_h_is_not_version_1_5_0beta30;
+typedef png_libpng_version_1_5_3beta01 Your_png_h_is_not_version_1_5_3beta01;
--- a/pngtest.png
+++ b/pngtest.png
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,8 +1,8 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.2 [March 31, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -79,7 +79,7 @@ png_set_packswap(png_structp png_ptr)

 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
 void PNGAPI
-png_set_shift(png_structp png_ptr, png_color_8p true_bits)
+png_set_shift(png_structp png_ptr, png_const_color_8p true_bits)
 {
   png_debug(1, "in png_set_shift");

@@ -217,8 +217,8 @@ png_do_invert(png_row_infop row_info, png_bytep row)
   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i++)
      {
@@ -231,8 +231,8 @@ png_do_invert(png_row_infop row_info, png_bytep row)
      row_info->bit_depth == 8)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i += 2)
      {
@@ -241,12 +241,13 @@ png_do_invert(png_row_infop row_info, png_bytep row)
      }
   }

+#ifdef PNG_16BIT_SUPPORTED
   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
      row_info->bit_depth == 16)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i += 4)
      {
@@ -255,9 +256,11 @@ png_do_invert(png_row_infop row_info, png_bytep row)
         rp += 4;
      }
   }
+#endif
 }
 #endif

+#ifdef PNG_16BIT_SUPPORTED
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* Swaps byte order on 16 bit depth images */
 void /* PRIVATE */
@@ -280,6 +283,7 @@ png_do_swap(png_row_infop row_info, png_bytep row)
   }
 }
 #endif
+#endif

 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 static PNG_CONST png_byte onebppswaptable[256] = {
@@ -395,18 +399,19 @@ png_do_packswap(png_row_infop row_info, png_bytep row)

   if (row_info->bit_depth < 8)
   {
-      png_bytep rp, end, table;
+      png_bytep rp;
+      png_const_bytep end, table;

      end = row + row_info->rowbytes;

      if (row_info->bit_depth == 1)
-         table = (png_bytep)onebppswaptable;
+         table = onebppswaptable;

      else if (row_info->bit_depth == 2)
-         table = (png_bytep)twobppswaptable;
+         table = twobppswaptable;

      else if (row_info->bit_depth == 4)
-         table = (png_bytep)fourbppswaptable;
+         table = fourbppswaptable;

      else
         return;
@@ -419,169 +424,115 @@ png_do_packswap(png_row_infop row_info, png_bytep row)

 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-/* Remove filler or alpha byte(s) */
+/* Remove a channel - this used to be 'png_do_strip_filler' but it used a
+ * somewhat weird combination of flags to determine what to do.  All the calls
+ * to png_do_strip_filler are changed in 1.5.2 to call this instead with the
+ * correct arguments.
+ *
+ * The routine isn't general - the channel must be the channel at the start or
+ * end (not in the middle) of each pixel.
+ */
 void /* PRIVATE */
-png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
+png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
 {
-   png_debug(1, "in png_do_strip_filler");
+   png_bytep sp = row; /* source pointer */
+   png_bytep dp = row; /* destination pointer */
+   png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */

+   /* At the start sp will point to the first byte to copy and dp to where
+    * it is copied to.  ep always points just beyond the end of the row, so
+    * the loop simply copies (channels-1) channels until sp reaches ep.
+    */
+   /* GA, GX, XG cases */
+   if (row_info->channels == 2)
   {
-      png_bytep sp = row;
-      png_bytep dp = row;
-      png_uint_32 row_width = row_info->width;
-      png_uint_32 i;
-
-      if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
-          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-          (flags & PNG_FLAG_STRIP_ALPHA))) &&
-          row_info->channels == 4)
+      if (row_info->bit_depth == 8)
      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This converts from RGBX or RGBA to RGB */
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               dp += 3; sp += 4;
-               for (i = 1; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp++;
-               }
-            }
+         if (at_start) /* Skip initial filler */
+            ++sp;
+         else          /* Skip initial channels and, for sp, the filler */
+            sp += 2, ++dp;

-            /* This converts from XRGB or ARGB to RGB */
-            else
-            {
-               for (i = 0; i < row_width; i++)
-               {
-                  sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-            row_info->pixel_depth = 24;
-            row_info->rowbytes = row_width * 3;
-         }
+         /* For a 1 pixel wide image there is nothing to do */
+         while (sp < ep)
+            *dp++ = *sp, sp += 2;

-         else /* if (row_info->bit_depth == 16) */
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
-               sp += 8; dp += 6;
-               for (i = 1; i < row_width; i++)
-               {
-                  /* This could be (although png_memcpy is probably slower):
-                  png_memcpy(dp, sp, 6);
-                  sp += 8;
-                  dp += 6;
-                  */
-
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp += 2;
-               }
-            }
-
-            else
-            {
-               /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
-               for (i = 0; i < row_width; i++)
-               {
-                  /* This could be (although png_memcpy is probably slower):
-                  png_memcpy(dp, sp, 6);
-                  sp += 8;
-                  dp += 6;
-                  */
-
-                  sp += 2;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-
-            row_info->pixel_depth = 48;
-            row_info->rowbytes = row_width * 6;
-         }
-         row_info->channels = 3;
+         row_info->pixel_depth = 8;
      }

-      else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
-         (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-         (flags & PNG_FLAG_STRIP_ALPHA))) &&
-          row_info->channels == 2)
+      else if (row_info->bit_depth == 16)
      {
-         if (row_info->bit_depth == 8)
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from GX or GA to G */
-               for (i = 0; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  sp++;
-               }
-            }
+         if (at_start)
+            sp += 2;
+         else
+            sp += 4, dp += 2;

-            else
-            {
-               /* This converts from XG or AG to G */
-               for (i = 0; i < row_width; i++)
-               {
-                  sp++;
-                  *dp++ = *sp++;
-               }
-            }
+         while (sp < ep)
+            *dp++ = *sp++, *dp++ = *sp, sp += 3;

-            row_info->pixel_depth = 8;
-            row_info->rowbytes = row_width;
-         }
-
-         else /* if (row_info->bit_depth == 16) */
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from GGXX or GGAA to GG */
-               sp += 4; dp += 2;
-               for (i = 1; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp += 2;
-               }
-            }
-
-            else
-            {
-               /* This converts from XXGG or AAGG to GG */
-               for (i = 0; i < row_width; i++)
-               {
-                  sp += 2;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-
-            row_info->pixel_depth = 16;
-            row_info->rowbytes = row_width * 2;
-         }
-         row_info->channels = 1;
+         row_info->pixel_depth = 16;
      }

-      if (flags & PNG_FLAG_STRIP_ALPHA)
-        row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
+      else
+         return; /* bad bit depth */
+
+      row_info->channels = 1;
+
+      /* Finally fix the color type if it records an alpha channel */
+      if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+         row_info->color_type = PNG_COLOR_TYPE_GRAY;
   }
+
+   /* RGBA, RGBX, XRGB cases */
+   else if (row_info->channels == 4)
+   {
+      if (row_info->bit_depth == 8)
+      {
+         if (at_start) /* Skip initial filler */
+            ++sp;
+         else          /* Skip initial channels and, for sp, the filler */
+            sp += 4, dp += 3;
+
+         /* Note that the loop adds 3 to dp and 4 to sp each time. */
+         while (sp < ep)
+            *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;
+
+         row_info->pixel_depth = 24;
+      }
+
+      else if (row_info->bit_depth == 16)
+      {
+         if (at_start)
+            sp += 2;
+         else
+            sp += 8, dp += 6;
+
+         while (sp < ep)
+         {
+            /* Copy 6 bytes, skip 2 */
+            *dp++ = *sp++, *dp++ = *sp++;
+            *dp++ = *sp++, *dp++ = *sp++;
+            *dp++ = *sp++, *dp++ = *sp, sp += 3;
+         }
+
+         row_info->pixel_depth = 48;
+      }
+
+      else
+         return; /* bad bit depth */
+
+      row_info->channels = 3;
+
+      /* Finally fix the color type if it records an alpha channel */
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+         row_info->color_type = PNG_COLOR_TYPE_RGB;
+   }
+
+   else
+      return; /* The filler channel has gone already */
+
+   /* Fix the rowbytes value. */
+   row_info->rowbytes = dp-row;
 }
 #endif

@@ -624,6 +575,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
         }
      }

+#ifdef PNG_16BIT_SUPPORTED
      else if (row_info->bit_depth == 16)
      {
         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
@@ -658,12 +610,14 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
            }
         }
      }
+#endif
   }
 }
 #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */

 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 void PNGAPI
 png_set_user_transform_info(png_structp png_ptr, png_voidp
   user_transform_ptr, int user_transform_depth, int user_transform_channels)
@@ -672,34 +626,49 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp

   if (png_ptr == NULL)
      return;
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
   png_ptr->user_transform_ptr = user_transform_ptr;
   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
-#else
-   if (user_transform_ptr || user_transform_depth || user_transform_channels)
-      png_warning(png_ptr,
-        "This version of libpng does not support user transform info");
-#endif
 }
+#endif

 /* This function returns a pointer to the user_transform_ptr associated with
 * the user transform functions.  The application should free any memory
 * associated with this pointer before png_write_destroy and png_read_destroy
 * are called.
 */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 png_voidp PNGAPI
-png_get_user_transform_ptr(png_structp png_ptr)
+png_get_user_transform_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);

-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
   return ((png_voidp)png_ptr->user_transform_ptr);
-#else
-   return (NULL);
-#endif
 }
+#endif
+
+#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
+png_uint_32 PNGAPI
+png_get_current_row_number(png_const_structp png_ptr)
+{
+   /* See the comments in png.h - this is the sub-image row when reading and
+    * interlaced image.
+    */
+   if (png_ptr != NULL)
+      return png_ptr->row_number;
+
+   return PNG_UINT_32_MAX; /* help the app not to fail silently */
+}
+
+png_byte PNGAPI
+png_get_current_pass_number(png_const_structp png_ptr)
+{
+   if (png_ptr != NULL)
+      return png_ptr->pass;
+   return 8; /* invalid */
+}
+#endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */
 #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED ||
-	  PNG_WRITE_USER_TRANSFORM_SUPPORTED */
+          PNG_WRITE_USER_TRANSFORM_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
--- a/pngvalid.c
+++ b/pngvalid.c
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,8 +1,8 @@

 /* pngwio.c - functions for data output
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -30,10 +30,11 @@
 */

 void /* PRIVATE */
-png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length)
 {
+   /* NOTE: write_data_fn must not change the buffer! */
   if (png_ptr->write_data_fn != NULL )
-      (*(png_ptr->write_data_fn))(png_ptr, data, length);
+      (*(png_ptr->write_data_fn))(png_ptr, (png_bytep)data, length);

   else
      png_error(png_ptr, "Call to NULL write function");
@@ -49,7 +50,7 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 void PNGCBAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_uint_32 check;
+   png_size_t check;

   if (png_ptr == NULL)
      return;
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,8 +1,8 @@

 /* pngwrite.c - general routines to write a PNG file
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.3 [(PENDING RELEASE)]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -60,15 +60,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
    */
 #ifdef PNG_WRITE_gAMA_SUPPORTED
   if (info_ptr->valid & PNG_INFO_gAMA)
-   {
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-      png_write_gAMA(png_ptr, info_ptr->gamma);
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
-#  endif
-#endif
-   }
+      png_write_gAMA_fixed(png_ptr, info_ptr->gamma);
 #endif
 #ifdef PNG_WRITE_sRGB_SUPPORTED
   if (info_ptr->valid & PNG_INFO_sRGB)
@@ -78,32 +70,19 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #ifdef PNG_WRITE_iCCP_SUPPORTED
   if (info_ptr->valid & PNG_INFO_iCCP)
      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
-                     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
+          (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif
 #ifdef PNG_WRITE_sBIT_SUPPORTED
   if (info_ptr->valid & PNG_INFO_sBIT)
      png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
 #endif
-
 #ifdef PNG_WRITE_cHRM_SUPPORTED
   if (info_ptr->valid & PNG_INFO_cHRM)
-   {
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-      png_write_cHRM(png_ptr,
+      png_write_cHRM_fixed(png_ptr,
          info_ptr->x_white, info_ptr->y_white,
          info_ptr->x_red, info_ptr->y_red,
          info_ptr->x_green, info_ptr->y_green,
          info_ptr->x_blue, info_ptr->y_blue);
-#else
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-      png_write_cHRM_fixed(png_ptr,
-          info_ptr->int_x_white, info_ptr->int_y_white,
-          info_ptr->int_x_red, info_ptr->int_y_red,
-          info_ptr->int_x_green, info_ptr->int_y_green,
-          info_ptr->int_x_blue, info_ptr->int_y_blue);
-#  endif
-#endif
-   }
 #endif

 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
@@ -168,7 +147,8 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
      {
         int j;
         for (j = 0; j<(int)info_ptr->num_trans; j++)
-            info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]);
+            info_ptr->trans_alpha[j] =
+               (png_byte)(255 - info_ptr->trans_alpha[j]);
      }
 #endif
      png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
@@ -198,25 +178,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          info_ptr->pcal_units, info_ptr->pcal_params);
 #endif

-#ifdef PNG_sCAL_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_sCAL)
 #ifdef PNG_WRITE_sCAL_SUPPORTED
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
-      png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
-          info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
-#else /* !FLOATING_POINT */
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
+   if (info_ptr->valid & PNG_INFO_sCAL)
      png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
          info_ptr->scal_s_width, info_ptr->scal_s_height);
-#endif /* FIXED_POINT */
-
-#endif /* FLOATING_POINT */
-#else  /* !WRITE_sCAL */
-      png_warning(png_ptr,
-          "png_write_sCAL not supported; sCAL chunk not written");
-#endif /* WRITE_sCAL */
 #endif /* sCAL */

 #ifdef PNG_WRITE_pHYs_SUPPORTED
@@ -447,7 +412,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 #ifdef PNG_CONVERT_tIME_SUPPORTED
 /* "tm" structure is not supported on WindowsCE */
 void PNGAPI
-png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
+png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime)
 {
   png_debug(1, "in png_convert_from_struct_tm");

@@ -472,9 +437,9 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
 #endif

 /* Initialize png_ptr structure, and allocate any memory needed */
-png_structp PNGAPI
-png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn)
+PNG_FUNCTION(png_structp,PNGAPI
+png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
   return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
@@ -482,10 +447,12 @@ png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 }

 /* Alternate initialize png_ptr structure, and allocate any memory needed */
-png_structp PNGAPI
-png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */
+
+PNG_FUNCTION(png_structp,PNGAPI
+png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
   volatile int png_cleanup_needed = 0;
@@ -609,8 +576,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   png_set_write_fn(png_ptr, NULL, NULL, NULL);

 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-   png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
-       1, NULL, NULL);
+   png_reset_filter_heuristics(png_ptr);
 #endif

   return (png_ptr);
@@ -677,7 +643,7 @@ png_write_image(png_structp png_ptr, png_bytepp image)

 /* Called by user to write a row of image data */
 void PNGAPI
-png_write_row(png_structp png_ptr, png_bytep row)
+png_write_row(png_structp png_ptr, png_const_bytep row)
 {
   if (png_ptr == NULL)
      return;
@@ -746,6 +712,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 1:
            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
            {
@@ -753,6 +720,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 2:
            if ((png_ptr->row_number & 0x07) != 4)
            {
@@ -760,6 +728,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 3:
            if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
            {
@@ -767,6 +736,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 4:
            if ((png_ptr->row_number & 0x03) != 2)
            {
@@ -774,6 +744,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 5:
            if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
            {
@@ -781,6 +752,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
         case 6:
            if (!(png_ptr->row_number & 0x01))
            {
@@ -788,6 +760,9 @@ png_write_row(png_structp png_ptr, png_bytep row)
               return;
            }
            break;
+
+         default: /* error: ignore it */
+            break;
      }
   }
 #endif
@@ -808,7 +783,8 @@ png_write_row(png_structp png_ptr, png_bytep row)
   png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
   png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
   png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
-   png_debug1(3, "row_info->rowbytes = %u", png_ptr->row_info.rowbytes);
+   png_debug1(3, "row_info->rowbytes = %lu",
+       (unsigned long)png_ptr->row_info.rowbytes);

   /* Copy user's row into buffer, leaving room for filter byte. */
   png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
@@ -816,10 +792,10 @@ png_write_row(png_structp png_ptr, png_bytep row)
 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
   /* Handle interlacing */
   if (png_ptr->interlaced && png_ptr->pass < 6 &&
-      (png_ptr->transformations & PNG_INTERLACE))
+       (png_ptr->transformations & PNG_INTERLACE))
   {
      png_do_write_interlace(&(png_ptr->row_info),
-         png_ptr->row_buf + 1, png_ptr->pass);
+          png_ptr->row_buf + 1, png_ptr->pass);
      /* This should always get caught above, but still ... */
      if (!(png_ptr->row_info.width))
      {
@@ -844,7 +820,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
    * 5. The color_type is RGB or RGBA
    */
   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
-      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
   {
      /* Intrapixel differencing */
      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -965,20 +941,20 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
   {
      if (png_ptr != NULL)
      {
-        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+         png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);

 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-        if (png_ptr->num_chunk_list)
-        {
-           png_free(png_ptr, png_ptr->chunk_list);
-           png_ptr->num_chunk_list = 0;
-        }
+         if (png_ptr->num_chunk_list)
+         {
+            png_free(png_ptr, png_ptr->chunk_list);
+            png_ptr->num_chunk_list = 0;
+         }
 #endif
      }

 #ifdef PNG_USER_MEM_SUPPORTED
      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
-         (png_voidp)mem_ptr);
+          (png_voidp)mem_ptr);
 #else
      png_destroy_struct((png_voidp)info_ptr);
 #endif
@@ -1034,9 +1010,8 @@ png_write_destroy(png_structp png_ptr)
 #endif

 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-   png_free(png_ptr, png_ptr->prev_filters);
-   png_free(png_ptr, png_ptr->filter_weights);
-   png_free(png_ptr, png_ptr->inv_filter_weights);
+   /* Use this to save a little code space, it doesn't free the filter_costs */
+   png_reset_filter_heuristics(png_ptr);
   png_free(png_ptr, png_ptr->filter_costs);
   png_free(png_ptr, png_ptr->inv_filter_costs);
 #endif
@@ -1139,7 +1114,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
            if (png_ptr->prev_row == NULL)
            {
               png_warning(png_ptr, "Can't add Up filter after starting");
-               png_ptr->do_filter &= ~PNG_FILTER_UP;
+               png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
+                   ~PNG_FILTER_UP);
            }

            else
@@ -1155,7 +1131,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
            if (png_ptr->prev_row == NULL)
            {
               png_warning(png_ptr, "Can't add Average filter after starting");
-               png_ptr->do_filter &= ~PNG_FILTER_AVG;
+               png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
+                   ~PNG_FILTER_AVG);
            }

            else
@@ -1200,41 +1177,59 @@ png_set_filter(png_structp png_ptr, int method, int filters)
 * better compression.
 */
 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED      /* GRR 970116 */
-void PNGAPI
-png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
-   int num_weights, png_doublep filter_weights,
-   png_doublep filter_costs)
+/* Convenience reset API. */
+static void
+png_reset_filter_heuristics(png_structp png_ptr)
 {
-   int i;
+   /* Clear out any old values in the 'weights' - this must be done because if
+    * the app calls set_filter_heuristics multiple times with different
+    * 'num_weights' values we would otherwise potentially have wrong sized
+    * arrays.
+    */
+   png_ptr->num_prev_filters = 0;
+   png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
+   if (png_ptr->prev_filters != NULL)
+   {
+      png_bytep old = png_ptr->prev_filters;
+      png_ptr->prev_filters = NULL;
+      png_free(png_ptr, old);
+   }
+   if (png_ptr->filter_weights != NULL)
+   {
+      png_uint_16p old = png_ptr->filter_weights;
+      png_ptr->filter_weights = NULL;
+      png_free(png_ptr, old);
+   }

-   png_debug(1, "in png_set_filter_heuristics");
+   if (png_ptr->inv_filter_weights != NULL)
+   {
+      png_uint_16p old = png_ptr->inv_filter_weights;
+      png_ptr->inv_filter_weights = NULL;
+      png_free(png_ptr, old);
+   }

+   /* Leave the filter_costs - this array is fixed size. */
+}
+
+static int
+png_init_filter_heuristics(png_structp png_ptr, int heuristic_method,
+   int num_weights)
+{
   if (png_ptr == NULL)
-      return;
+      return 0;

-   if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
+   /* Clear out the arrays */
+   png_reset_filter_heuristics(png_ptr);
+
+   /* Check arguments; the 'reset' function makes the correct settings for the
+    * unweighted case, but we must handle the weight case by initializing the
+    * arrays for the caller.
+    */
+   if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
   {
-      png_warning(png_ptr, "Unknown filter heuristic method");
-      return;
-   }
+      int i;

-   if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
-   {
-      heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
-   }
-
-   if (num_weights < 0 || filter_weights == NULL ||
-      heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
-   {
-      num_weights = 0;
-   }
-
-   png_ptr->num_prev_filters = (png_byte)num_weights;
-   png_ptr->heuristic_method = (png_byte)heuristic_method;
-
-   if (num_weights > 0)
-   {
-      if (png_ptr->prev_filters == NULL)
+      if (num_weights > 0)
      {
         png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
             (png_uint_32)(png_sizeof(png_byte) * num_weights));
@@ -1244,10 +1239,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
         {
            png_ptr->prev_filters[i] = 255;
         }
-      }

-      if (png_ptr->filter_weights == NULL)
-      {
         png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
             (png_uint_32)(png_sizeof(png_uint_16) * num_weights));

@@ -1259,11 +1251,69 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
            png_ptr->inv_filter_weights[i] =
            png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
         }
+
+         /* Safe to set this now */
+         png_ptr->num_prev_filters = (png_byte)num_weights;
      }

+      /* If, in the future, there are other filter methods, this would
+       * need to be based on png_ptr->filter.
+       */
+      if (png_ptr->filter_costs == NULL)
+      {
+         png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
+             (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+
+         png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
+             (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+      }
+
+      for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+      {
+         png_ptr->inv_filter_costs[i] =
+         png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+      }
+
+      /* All the arrays are inited, safe to set this: */
+      png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;
+
+      /* Return the 'ok' code. */
+      return 1;
+   }
+   else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||
+      heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
+   {
+      return 1;
+   }
+   else
+   {
+      png_warning(png_ptr, "Unknown filter heuristic method");
+      return 0;
+   }
+}
+
+/* Provide floating and fixed point APIs */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
+    int num_weights, png_const_doublep filter_weights,
+    png_const_doublep filter_costs)
+{
+   png_debug(1, "in png_set_filter_heuristics");
+
+   /* The internal API allocates all the arrays and ensures that the elements of
+    * those arrays are set to the default value.
+    */
+   if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
+      return;
+
+   /* If using the weighted method copy in the weights. */
+   if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+   {
+      int i;
      for (i = 0; i < num_weights; i++)
      {
-         if (filter_weights[i] < 0.0)
+         if (filter_weights[i] <= 0.0)
         {
            png_ptr->inv_filter_weights[i] =
            png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
@@ -1272,57 +1322,97 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
         else
         {
            png_ptr->inv_filter_weights[i] =
-                (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
+                (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);

            png_ptr->filter_weights[i] =
-                (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
+                (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);
         }
      }
-   }

-   /* If, in the future, there are other filter methods, this would
-    * need to be based on png_ptr->filter.
-    */
-   if (png_ptr->filter_costs == NULL)
-   {
-      png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
-          (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
-
-      png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
-          (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
-
-      for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+      /* Here is where we set the relative costs of the different filters.  We
+       * should take the desired compression level into account when setting
+       * the costs, so that Paeth, for instance, has a high relative cost at low
+       * compression levels, while it has a lower relative cost at higher
+       * compression settings.  The filter types are in order of increasing
+       * relative cost, so it would be possible to do this with an algorithm.
+       */
+      for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0)
      {
         png_ptr->inv_filter_costs[i] =
-         png_ptr->filter_costs[i] = PNG_COST_FACTOR;
-      }
-   }
-
-   /* Here is where we set the relative costs of the different filters.  We
-    * should take the desired compression level into account when setting
-    * the costs, so that Paeth, for instance, has a high relative cost at low
-    * compression levels, while it has a lower relative cost at higher
-    * compression settings.  The filter types are in order of increasing
-    * relative cost, so it would be possible to do this with an algorithm.
-    */
-   for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
-   {
-      if (filter_costs == NULL || filter_costs[i] < 0.0)
-      {
-         png_ptr->inv_filter_costs[i] =
-         png_ptr->filter_costs[i] = PNG_COST_FACTOR;
-      }
-
-      else if (filter_costs[i] >= 1.0)
-      {
-         png_ptr->inv_filter_costs[i] =
-             (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
+             (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);

         png_ptr->filter_costs[i] =
-             (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
+             (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);
      }
   }
 }
+#endif /* FLOATING_POINT */
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method,
+    int num_weights, png_const_fixed_point_p filter_weights,
+    png_const_fixed_point_p filter_costs)
+{
+   png_debug(1, "in png_set_filter_heuristics_fixed");
+
+   /* The internal API allocates all the arrays and ensures that the elements of
+    * those arrays are set to the default value.
+    */
+   if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
+      return;
+
+   /* If using the weighted method copy in the weights. */
+   if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+   {
+      int i;
+      for (i = 0; i < num_weights; i++)
+      {
+         if (filter_weights[i] <= 0)
+         {
+            png_ptr->inv_filter_weights[i] =
+            png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+         }
+
+         else
+         {
+            png_ptr->inv_filter_weights[i] = (png_uint_16)
+               ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
+
+            png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*
+               PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);
+         }
+      }
+
+      /* Here is where we set the relative costs of the different filters.  We
+       * should take the desired compression level into account when setting
+       * the costs, so that Paeth, for instance, has a high relative cost at low
+       * compression levels, while it has a lower relative cost at higher
+       * compression settings.  The filter types are in order of increasing
+       * relative cost, so it would be possible to do this with an algorithm.
+       */
+      for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+         if (filter_costs[i] >= PNG_FP_1)
+      {
+         png_uint_32 tmp;
+
+         /* Use a 32 bit unsigned temporary here because otherwise the
+          * intermediate value will be a 32 bit *signed* integer (ANSI rules)
+          * and this will get the wrong answer on division.
+          */
+         tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);
+         tmp /= filter_costs[i];
+
+         png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;
+
+         tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;
+         tmp /= PNG_FP_1;
+
+         png_ptr->filter_costs[i] = (png_uint_16)tmp;
+      }
+   }
+}
+#endif /* FIXED_POINT */
 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */

 void PNGAPI
@@ -1376,10 +1466,10 @@ png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 #ifndef WBITS_8_OK
   /* Avoid libpng bug with 256-byte windows */
   if (window_bits == 8)
-     {
-       png_warning(png_ptr, "Compression window is being reset to 512");
-       window_bits = 9;
-     }
+      {
+        png_warning(png_ptr, "Compression window is being reset to 512");
+        window_bits = 9;
+      }

 #endif
   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
@@ -1401,6 +1491,86 @@ png_set_compression_method(png_structp png_ptr, int method)
   png_ptr->zlib_method = method;
 }

+/* The following were added to libpng-1.5.3 */
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
+void PNGAPI
+png_set_text_compression_level(png_structp png_ptr, int level)
+{
+   png_debug(1, "in png_set_text_compression_level");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL;
+   png_ptr->zlib_text_level = level;
+}
+
+void PNGAPI
+png_set_text_compression_mem_level(png_structp png_ptr, int mem_level)
+{
+   png_debug(1, "in png_set_text_compression_mem_level");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL;
+   png_ptr->zlib_text_mem_level = mem_level;
+}
+
+void PNGAPI
+png_set_text_compression_strategy(png_structp png_ptr, int strategy)
+{
+   png_debug(1, "in png_set_text_compression_strategy");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY;
+   png_ptr->zlib_text_strategy = strategy;
+}
+
+void PNGAPI
+png_set_text_compression_window_bits(png_structp png_ptr, int window_bits)
+{
+   if (png_ptr == NULL)
+      return;
+
+   if (window_bits > 15)
+      png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
+
+   else if (window_bits < 8)
+      png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
+
+#ifndef WBITS_8_OK
+   /* Avoid libpng bug with 256-byte windows */
+   if (window_bits == 8)
+      {
+        png_warning(png_ptr, "Text compression window is being reset to 512");
+        window_bits = 9;
+      }
+
+#endif
+   png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS;
+   png_ptr->zlib_text_window_bits = window_bits;
+}
+
+void PNGAPI
+png_set_text_compression_method(png_structp png_ptr, int method)
+{
+   png_debug(1, "in png_set_text_compression_method");
+
+   if (png_ptr == NULL)
+      return;
+
+   if (method != 8)
+      png_warning(png_ptr, "Only compression method 8 is supported by PNG");
+
+   png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_METHOD;
+   png_ptr->zlib_text_method = method;
+}
+#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
+/* end of API added to libpng-1.5.3 */
+
 void PNGAPI
 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
 {
@@ -1429,7 +1599,7 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
 #ifdef PNG_INFO_IMAGE_SUPPORTED
 void PNGAPI
 png_write_png(png_structp png_ptr, png_infop info_ptr,
-              int transforms, voidp params)
+    int transforms, voidp params)
 {
   if (png_ptr == NULL || info_ptr == NULL)
      return;
@@ -1508,8 +1678,8 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
   /* It is REQUIRED to call this to finish writing the rest of the file */
   png_write_end(png_ptr, info_ptr);

-   transforms = transforms; /* Quiet compiler warnings */
-   params = params;
+   PNG_UNUSED(transforms)   /* Quiet compiler warnings */
+   PNG_UNUSED(params)
 }
 #endif
 #endif /* PNG_WRITE_SUPPORTED */
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,8 +1,8 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * Last changed in libpng 1.5.0 [June 22, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.2 [March 31, 2011]
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -29,23 +29,23 @@ png_do_write_transformations(png_structp png_ptr)
 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
   if (png_ptr->transformations & PNG_USER_TRANSFORM)
      if (png_ptr->write_user_transform_fn != NULL)
-        (*(png_ptr->write_user_transform_fn)) /* User write transform
+         (*(png_ptr->write_user_transform_fn)) /* User write transform
                                                 function */
-            (png_ptr,                    /* png_ptr */
-            &(png_ptr->row_info),           /* row_info: */
-               /*  png_uint_32 width;       width of row */
-               /*  png_uint_32 rowbytes;    number of bytes in row */
-               /*  png_byte color_type;     color type of pixels */
-               /*  png_byte bit_depth;      bit depth of samples */
-               /*  png_byte channels;       number of channels (1-4) */
-               /*  png_byte pixel_depth;    bits per pixel (depth*channels) */
-            png_ptr->row_buf + 1);      /* start of pixel data for row */
+             (png_ptr,                    /* png_ptr */
+             &(png_ptr->row_info),           /* row_info: */
+                /*  png_uint_32 width;       width of row */
+                /*  png_size_t rowbytes;     number of bytes in row */
+                /*  png_byte color_type;     color type of pixels */
+                /*  png_byte bit_depth;      bit depth of samples */
+                /*  png_byte channels;       number of channels (1-4) */
+                /*  png_byte pixel_depth;    bits per pixel (depth*channels) */
+             png_ptr->row_buf + 1);      /* start of pixel data for row */
 #endif

 #ifdef PNG_WRITE_FILLER_SUPPORTED
   if (png_ptr->transformations & PNG_FILLER)
-      png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
-          png_ptr->flags);
+      png_do_strip_channel(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         !(png_ptr->flags & PNG_FILLER_AFTER));
 #endif

 #ifdef PNG_WRITE_PACKSWAP_SUPPORTED
@@ -142,6 +142,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)

            break;
         }
+
         case 2:
         {
            png_bytep sp, dp;
@@ -180,6 +181,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)

            break;
         }
+
         case 4:
         {
            png_bytep sp, dp;
@@ -218,7 +220,11 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)

            break;
         }
+
+         default:
+            break;
      }
+
      row_info->bit_depth = (png_byte)bit_depth;
      row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
@@ -236,7 +242,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 * data to 0 to 15.
 */
 void /* PRIVATE */
-png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
+png_do_shift(png_row_infop row_info, png_bytep row,
+    png_const_color_8p bit_depth)
 {
   png_debug(1, "in png_do_shift");

@@ -278,9 +285,9 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
      if (row_info->bit_depth < 8)
      {
         png_bytep bp = row;
-         png_uint_32 i;
+         png_size_t i;
         png_byte mask;
-         png_uint_32 row_bytes = row_info->rowbytes;
+         png_size_t row_bytes = row_info->rowbytes;

         if (bit_depth->gray == 1 && row_info->bit_depth == 2)
            mask = 0x55;
@@ -309,6 +316,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
            }
         }
      }
+
      else if (row_info->bit_depth == 8)
      {
         png_bytep bp = row;
@@ -335,6 +343,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
            }
         }
      }
+
      else
      {
         png_bytep bp;
@@ -392,6 +401,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
            }
         }

+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This converts from AARRGGBB to RRGGBBAA */
@@ -414,6 +424,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save[1];
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }

      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
@@ -433,6 +444,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
            }
         }

+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This converts from AAGG to GGAA */
@@ -451,6 +463,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save[1];
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
   }
 }
@@ -484,6 +497,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
            }
         }

+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This inverts the alpha channel in RRGGBBAA */
@@ -506,6 +520,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }

      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
@@ -524,6 +539,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
            }
         }

+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This inverts the alpha channel in GGAA */
@@ -542,6 +558,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
   }
 }
@@ -579,6 +596,7 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
         }
      }

+#ifdef PNG_WRITE_16BIT_SUPPORTED
      else if (row_info->bit_depth == 16)
      {
         png_bytep rp;
@@ -606,6 +624,7 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
            *(rp + 5) = (png_byte)(blue & 0xff);
         }
      }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
   }
 }
 #endif /* PNG_MNG_FEATURES_SUPPORTED */
--- a/pngwutil.c
+++ b/pngwutil.c
--- a/projects/visualc71/PRJ0041.mak
+++ b/projects/visualc71/PRJ0041.mak
@@ -0,0 +1,21 @@
+# Prevent "Cannot find missing dependency..." warnings while compiling
+# pngwin.rc (PRJ0041).
+
+all: $(IntDir)\alloc.h \
+	 $(IntDir)\fp.h \
+	 $(IntDir)\m68881.h \
+	 $(IntDir)\mem.h \
+	 $(IntDir)\pngusr.h \
+	 $(IntDir)\strings.h \
+	 $(IntDir)\unistd.h \
+	 $(IntDir)\unixio.h
+	 
+$(IntDir)\alloc.h \
+$(IntDir)\fp.h \
+$(IntDir)\m68881.h \
+$(IntDir)\mem.h \
+$(IntDir)\pngusr.h \
+$(IntDir)\strings.h \
+$(IntDir)\unistd.h \
+$(IntDir)\unixio.h:
+	@!echo.>$@
--- a/projects/visualc71/README.txt
+++ b/projects/visualc71/README.txt
@@ -0,0 +1,58 @@
+Microsoft Developer Studio Project File, Format Version 7.10 for libpng.
+
+Copyright (C) 2004 Simon-Pierre Cadieux.
+
+This code is released under the libpng license.
+For conditions of distribution and use, see copyright notice in png.h
+
+NOTE: This project will be removed from libpng-1.5.0.  It has
+been replaced with the "vstudio" project.
+
+Assumptions:
+* The libpng source files are in ..\..
+* The zlib source files are in ..\..\..\zlib
+* The zlib project file is in . /* Warning: This is until the zlib project
+  files get intergrated into the next zlib release. The final zlib project
+  directory will then be ..\..\..\zlib\projects\visualc71. */
+
+To use:
+
+1) On the main menu, select "File | Open Solution".
+   Open "libpng.sln".
+
+2) Display the Solution Explorer view (Ctrl+Alt+L)
+
+3) Set one of the project as the StartUp project. If you just want to build the
+   binaries set "libpng" as the startup project (Select "libpng" tree view
+   item + Project | Set as StartUp project). If you want to build and test the
+   binaries set it to "pngtest" (Select "pngtest" tree view item +
+   Project | Set as StartUp project)
+
+4) Select "Build | Configuration Manager...".
+   Choose the configuration you wish to build.
+
+5) Select "Build | Clean Solution".
+
+6) Select "Build | Build Solution (Ctrl-Shift-B)"
+
+This project builds the libpng binaries as follows:
+
+* Win32_DLL_Release\libpng15.dll      DLL build
+* Win32_DLL_Debug\libpng15d.dll       DLL build (debug version)
+* Win32_DLL_VB\libpng15vb.dll         DLL build for Visual Basic, using stdcall
+* Win32_LIB_Release\libpng.lib        static build
+* Win32_LIB_Debug\libpngd.lib         static build (debug version)
+
+Notes:
+
+If you change anything in the source files, or select different compiler
+settings, please change the DLL name to something different than any of
+the above names. Also, make sure that in your "pngusr.h" you define
+PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX according to the
+instructions provided in "pngconf.h".
+
+All DLLs built by this project use the Microsoft dynamic C runtime library
+MSVCR71.DLL (MSVCR71D.DLL for debug versions).  If you distribute any of the
+above mentioned libraries you may have to include this DLL in your package.
+For a list of files that are redistributable in Visual Studio see
+$(VCINSTALLDIR)\redist.txt.
--- a/projects/visualc71/README_zlib.txt
+++ b/projects/visualc71/README_zlib.txt
@@ -0,0 +1,44 @@
+/* WARNING: This file was put in the LibPNG distribution for convenience only.
+            It is expected to be part of the next zlib release under
+            "projects\visualc71\README.txt." */
+
+Microsoft Developer Studio Project File, Format Version 7.10 for zlib.
+
+Copyright (C) 2004 Simon-Pierre Cadieux.
+Copyright (C) 2004 Cosmin Truta.
+
+This code is released under the libpng license.
+For conditions of distribution and use, see copyright notice in zlib.h.
+
+NOTE: This project will be removed from libpng-1.5.0.  It has
+been replaced with the "vstudio" project.
+
+To use:
+
+1) On the main menu, select "File | Open Solution".
+   Open "zlib.sln".
+
+2) Display the Solution Explorer view (Ctrl+Alt+L)
+
+3) Set one of the project as the StartUp project. If you just want to build the
+   binaries set "zlib" as the startup project (Select "zlib" tree view item +
+   Project | Set as StartUp project). If you want to build and test the
+   binaries set it to "example" (Select "example" tree view item + Project |
+   Set as StartUp project), If you want to build the minigzip utility set it to
+   "minigzip" (Select "minigzip" tree view item + Project | Set as StartUp
+   project
+
+4) Select "Build | Configuration Manager...".
+   Choose the configuration you wish to build.
+
+5) Select "Build | Clean Solution".
+
+6) Select "Build | Build Solution (Ctrl-Shift-B)"
+
+This project builds the zlib binaries as follows:
+
+* Win32_DLL_Release\zlib1.dll       DLL build
+* Win32_DLL_Debug\zlib1d.dll        DLL build (debug version)
+* Win32_LIB_Release\zlib.lib        static build
+* Win32_LIB_Debug\zlibd.lib         static build (debug version)
+
--- a/projects/visualc71/libpng.sln
+++ b/projects/visualc71/libpng.sln
@@ -0,0 +1,60 @@
+Microsoft Visual Studio Solution File, Format Version 8.00
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng.vcproj", "{0008960E-E0DD-41A6-8265-00B31DDB4C21}"
+	ProjectSection(ProjectDependencies) = postProject
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0} = {2D4F8105-7D21-454C-9932-B47CAB71A5C0}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngtest", "pngtest.vcproj", "{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}"
+	ProjectSection(ProjectDependencies) = postProject
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21} = {0008960E-E0DD-41A6-8265-00B31DDB4C21}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib.vcproj", "{2D4F8105-7D21-454C-9932-B47CAB71A5C0}"
+	ProjectSection(ProjectDependencies) = postProject
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfiguration) = preSolution
+		DLL Debug = DLL Debug
+		DLL Release = DLL Release
+		DLL VB = DLL VB
+		LIB Debug = LIB Debug
+		LIB Release = LIB Release
+	EndGlobalSection
+	GlobalSection(ProjectConfiguration) = postSolution
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Debug.Build.0 = DLL Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Release.ActiveCfg = DLL Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Release.Build.0 = DLL Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL VB.ActiveCfg = DLL VB|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL VB.Build.0 = DLL VB|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Debug.Build.0 = LIB Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Release.ActiveCfg = LIB Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Release.Build.0 = LIB Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Debug.Build.0 = DLL Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Release.ActiveCfg = DLL Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Release.Build.0 = DLL Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL VB.ActiveCfg = DLL VB|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL VB.Build.0 = DLL VB|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Debug.Build.0 = LIB Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Release.ActiveCfg = LIB Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Release.Build.0 = LIB Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Debug.Build.0 = DLL Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Release.ActiveCfg = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Release.Build.0 = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL VB.ActiveCfg = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL VB.Build.0 = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Debug.Build.0 = LIB Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Release.ActiveCfg = LIB Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Release.Build.0 = LIB Release|Win32
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+	EndGlobalSection
+	GlobalSection(ExtensibilityAddIns) = postSolution
+	EndGlobalSection
+EndGlobal
--- a/projects/visualc71/libpng.vcproj
+++ b/projects/visualc71/libpng.vcproj
@@ -0,0 +1,419 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="7.10"
+	Name="libpng"
+	RootNamespace="libpng">
+	<Platforms>
+		<Platform
+			Name="Win32"/>
+	</Platforms>
+	<Configurations>
+		<Configuration
+			Name="DLL Release|Win32"
+			OutputDirectory=".\Win32_DLL_Release"
+			IntermediateDirectory=".\Win32_DLL_Release"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_BUILD_DLL;ZLIB_DLL;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="pngpriv.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng15.dll"
+				LinkIncremental="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine="copy ..\..\scripts\pnglibconf.h.prebuilt ..\..\pnglibconf.h"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL Debug|Win32"
+			OutputDirectory=".\Win32_DLL_Debug"
+			IntermediateDirectory=".\Win32_DLL_Debug"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_DEBUG=1;PNG_BUILD_DLL;ZLIB_DLL;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="pngpriv.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng15d.dll"
+				GenerateDebugInformation="TRUE"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine="copy ..\..\scripts\pnglibconf.h.prebuilt ..\..\pnglibconf.h"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG,PNG_DEBUG=1"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL VB|Win32"
+			OutputDirectory=".\Win32_DLL_VB"
+			IntermediateDirectory=".\Win32_DLL_VB"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_BUILD_DLL;ZLIB_DLL;PNGAPI=__stdcall;PNG_NO_MODULEDEF;PNG_LIBPNG_SPECIALBUILD;PNG_USER_PRIVATEBUILD;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="pngpriv.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng15vb.dll"
+				LinkIncremental="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine="copy ..\..\scripts\pnglibconf.h.prebuilt ..\..\pnglibconf.h"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				AdditionalOptions="/d PNG_NO_PEDANTIC_WARNINGS /d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Release|Win32"
+			OutputDirectory=".\Win32_LIB_Release"
+			IntermediateDirectory=".\Win32_LIB_Release"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="pngpriv.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpng.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine="copy ..\..\scripts\pnglibconf.h.prebuilt ..\..\pnglibconf.h"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Debug|Win32"
+			OutputDirectory=".\Win32_LIB_Debug"
+			IntermediateDirectory=".\Win32_LIB_Debug"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="pngpriv.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpngd.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine="copy ..\..\scripts\pnglibconf.h.prebuilt ..\..\pnglibconf.h"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat">
+			<File
+				RelativePath="..\..\png.c">
+				<FileConfiguration
+					Name="DLL Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL VB|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\pngerror.c">
+				<FileConfiguration
+					Name="DLL Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL VB|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\pngget.c">
+			</File>
+			<File
+				RelativePath="..\..\pngmem.c">
+			</File>
+			<File
+				RelativePath="..\..\pngpread.c">
+			</File>
+			<File
+				RelativePath="..\..\pngread.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrio.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrtran.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrutil.c">
+			</File>
+			<File
+				RelativePath="..\..\pngset.c">
+			</File>
+			<File
+				RelativePath="..\..\pngtrans.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwio.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwrite.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwtran.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwutil.c">
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl">
+			<File
+				RelativePath="..\..\png.h">
+			</File>
+			<File
+				RelativePath="..\..\pngconf.h">
+			</File>
+			<File
+				RelativePath="..\..\pngpriv.h">
+			</File>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe">
+			<File
+				RelativePath="..\..\scripts\pngwin.rc">
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+			</File>
+		</Filter>
+		<File
+			RelativePath=".\PRJ0041.mak">
+			<FileConfiguration
+				Name="DLL Release|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL Debug|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL VB|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+		</File>
+		<File
+			RelativePath="README.txt">
+		</File>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>
--- a/projects/visualc71/pngtest.vcproj
+++ b/projects/visualc71/pngtest.vcproj
@@ -0,0 +1,267 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="7.10"
+	Name="pngtest"
+	RootNamespace="pngtest">
+	<Platforms>
+		<Platform
+			Name="Win32"/>
+	</Platforms>
+	<Configurations>
+		<Configuration
+			Name="DLL Release|Win32"
+			OutputDirectory=".\Win32_DLL_Release\Test"
+			IntermediateDirectory=".\Win32_DLL_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\scripts;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_DLL;PNG_NO_STDIO;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL Debug|Win32"
+			OutputDirectory=".\Win32_DLL_Debug\Test"
+			IntermediateDirectory=".\Win32_DLL_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\scripts;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_DLL;PNG_NO_STDIO;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL VB|Win32"
+			OutputDirectory=".\Win32_DLL_VB\Test"
+			IntermediateDirectory=".\Win32_DLL_VB\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\scripts;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_DLL;PNG_NO_STDIO;PNGAPI=__stdcall;PNG_USER_PRIVATEBUILD;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="2"
+				CallingConvention="2"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\..\Win32_DLL_Release\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				IgnoreDefaultLibraryNames="$(IntDir)\libpng15b.lib"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Release|Win32"
+			OutputDirectory=".\Win32_LIB_Release\Test"
+			IntermediateDirectory=".\Win32_LIB_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\scripts;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Debug|Win32"
+			OutputDirectory=".\Win32_LIB_Debug\Test"
+			IntermediateDirectory=".\Win32_LIB_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\scripts;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat">
+			<File
+				RelativePath="..\..\pngtest.c">
+			</File>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>
--- a/projects/visualc71/zlib.vcproj
+++ b/projects/visualc71/zlib.vcproj
@@ -0,0 +1,391 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="7.10"
+	Name="zlib">
+	<Platforms>
+		<Platform
+			Name="Win32"/>
+	</Platforms>
+	<Configurations>
+		<Configuration
+			Name="DLL Release|Win32"
+			OutputDirectory=".\Win32_DLL_Release\ZLib"
+			IntermediateDirectory=".\Win32_DLL_Release\ZLib"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="1"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlib1.dll"
+				LinkIncremental="1"
+				ModuleDefinitionFile="..\..\..\zlib\win32\zlib.def"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL Debug|Win32"
+			OutputDirectory=".\Win32_DLL_Debug\ZLib"
+			IntermediateDirectory=".\Win32_DLL_Debug\ZLib"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="1"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlib1d.dll"
+				ModuleDefinitionFile="..\..\..\zlib\win32\zlib.def"
+				GenerateDebugInformation="TRUE"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1033"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Release|Win32"
+			OutputDirectory=".\Win32_LIB_Release\ZLib"
+			IntermediateDirectory=".\Win32_LIB_Release\ZLib"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="1"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)\zlib.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Debug|Win32"
+			OutputDirectory=".\Win32_LIB_Debug\ZLib"
+			IntermediateDirectory=".\Win32_LIB_Debug\ZLib"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="1"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)\zlibd.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat">
+			<File
+				RelativePath="..\..\..\zlib\adler32.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\compress.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\crc32.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\deflate.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\gzlib.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\gzclose.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\gzread.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\gzwrite.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\infback.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inffast.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inflate.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inftrees.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\trees.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\uncompr.c">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\win32\zlib.def">
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\zutil.c">
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl">
+			<File
+				RelativePath="..\..\..\zlib\crc32.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\deflate.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inffast.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inffixed.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inflate.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\inftrees.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\trees.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\zconf.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\zlib.h">
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\zutil.h">
+			</File>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe">
+			<File
+				RelativePath="..\..\..\zlib\win32\zlib1.rc">
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+			</File>
+		</Filter>
+		<Filter
+			Name="Assembler Files (Unsupported)"
+			Filter="asm;obj;c;cpp;cxx;h;hpp;hxx">
+			<File
+				RelativePath="..\..\..\zlib\contrib\masmx86\gvmat32.asm">
+				<FileConfiguration
+					Name="DLL Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\contrib\masmx86\gvmat32c.c">
+				<FileConfiguration
+					Name="DLL Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCLCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCLCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCLCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCLCompilerTool"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\zlib\contrib\masmx86\inffas32.asm">
+				<FileConfiguration
+					Name="DLL Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+			</File>
+		</Filter>
+		<File
+			RelativePath="README.txt">
+		</File>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>
--- a/projects/vstudio/libpng/libpng.vcxproj
+++ b/projects/vstudio/libpng/libpng.vcxproj
@@ -88,7 +88,6 @@
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      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <FunctionLevelLinking>true</FunctionLevelLinking>
@@ -99,15 +98,14 @@
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      <DisableSpecificWarnings>4996;4127</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <TreatWarningAsError>true</TreatWarningAsError>
      <Optimization>Disabled</Optimization>
    </ClCompile>
    <Link>
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      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>zlib.lib;msvcrtd.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
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      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
    </Link>
@@ -120,7 +118,6 @@
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@@ -131,8 +128,9 @@
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      <DisableSpecificWarnings>4996;4127</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <TreatWarningAsError>true</TreatWarningAsError>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
@@ -144,7 +142,6 @@
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      <PrecompiledHeader>Use</PrecompiledHeader>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -156,7 +153,7 @@
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      <DisableSpecificWarnings>4996;4127</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLib1Dir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <TreatWarningAsError>true</TreatWarningAsError>
      <Optimization>Full</Optimization>
    </ClCompile>
@@ -165,10 +162,9 @@
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      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>zdll.lib;msvcrt.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+      <AdditionalDependencies>zlib.lib</AdditionalDependencies>
      <Version>15</Version>
-      <AdditionalLibraryDirectories>$(ZLib1Dir)</AdditionalLibraryDirectories>
+      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'">
@@ -176,7 +172,7 @@
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      <PrecompiledHeader>Use</PrecompiledHeader>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -188,9 +184,10 @@
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      <MinimalRebuild>false</MinimalRebuild>
      <DisableSpecificWarnings>4996;4127</DisableSpecificWarnings>
-      <AdditionalIncludeDirectories>$(ZLib1Dir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <TreatWarningAsError>true</TreatWarningAsError>
      <Optimization>Full</Optimization>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
@@ -198,6 +195,9 @@
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
    </Link>
+    <Lib>
+      <LinkTimeCodeGeneration>true</LinkTimeCodeGeneration>
+    </Lib>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="..\..\..\png.c">
--- a/projects/vstudio/pnglibconf/pnglibconf.vcxproj
+++ b/projects/vstudio/pnglibconf/pnglibconf.vcxproj
@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{EB33566E-DA7F-4D28-9077-88C0B7C77E35}</ProjectGuid>
+    <RootNamespace>pnglibconf</RootNamespace>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>MultiByte</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <CustomBuildBeforeTargets>Build</CustomBuildBeforeTargets>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+    <CustomBuildStep>
+      <Command>copy ..\..\..\scripts\pnglibconf.h.prebuilt ..\..\..\pnglibconf.h</Command>
+    </CustomBuildStep>
+    <CustomBuildStep>
+      <Message>Generating pnglibconf.h</Message>
+    </CustomBuildStep>
+    <CustomBuildStep>
+      <Outputs>..\..\..\pnglibconf.h</Outputs>
+    </CustomBuildStep>
+    <CustomBuildStep>
+      <Inputs>..\..\..\scripts\pnglibconf.h.prebuilt</Inputs>
+    </CustomBuildStep>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
--- a/projects/vstudio/pngtest/pngtest.vcxproj
+++ b/projects/vstudio/pngtest/pngtest.vcxproj
@@ -81,7 +81,6 @@
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      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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@@ -91,12 +90,12 @@
      <StringPooling>true</StringPooling>
      <FunctionLevelLinking>false</FunctionLevelLinking>
      <BrowseInformation>true</BrowseInformation>
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    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>libpng15.lib;zlib.lib;msvcrtd.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+      <AdditionalDependencies>libpng15.lib</AdditionalDependencies>
      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
    </Link>
    <CustomBuildStep>
@@ -114,7 +113,7 @@
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <Optimization>Disabled</Optimization>
      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <DisableSpecificWarnings>4996</DisableSpecificWarnings>
@@ -124,12 +123,12 @@
      <StringPooling>true</StringPooling>
      <FunctionLevelLinking>false</FunctionLevelLinking>
      <BrowseInformation>true</BrowseInformation>
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    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>libpng15.lib;zlib.lib;msvcrtd.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+      <AdditionalDependencies>libpng15.lib;zlib.lib</AdditionalDependencies>
      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
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    <CustomBuildStep>
@@ -145,25 +144,26 @@
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      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>$(ZLib1Dir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <DisableSpecificWarnings>4996</DisableSpecificWarnings>
      <CompileAsManaged>false</CompileAsManaged>
      <TreatWarningAsError>true</TreatWarningAsError>
      <StringPooling>true</StringPooling>
      <MinimalRebuild>false</MinimalRebuild>
      <BrowseInformation>true</BrowseInformation>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
+      <FloatingPointExceptions>false</FloatingPointExceptions>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>libpng15.lib;msvcrt.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+      <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+      <AdditionalDependencies>libpng15.lib</AdditionalDependencies>
      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
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@@ -179,26 +179,28 @@
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      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <Optimization>Full</Optimization>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>$(ZLib1Dir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <DisableSpecificWarnings>4996</DisableSpecificWarnings>
      <CompileAsManaged>false</CompileAsManaged>
      <TreatWarningAsError>true</TreatWarningAsError>
      <StringPooling>true</StringPooling>
      <MinimalRebuild>false</MinimalRebuild>
      <BrowseInformation>true</BrowseInformation>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
+      <FloatingPointExceptions>false</FloatingPointExceptions>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
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-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
-      <AdditionalLibraryDirectories>$(OutDir);$(ZLib1Dir)</AdditionalLibraryDirectories>
+      <AdditionalDependencies>libpng15.lib;zlib.lib</AdditionalDependencies>
+      <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
    </Link>
    <CustomBuildStep>
      <Message>Executing PNG test program</Message>
--- a/projects/vstudio/pngvalid/pngvalid.vcxproj
+++ b/projects/vstudio/pngvalid/pngvalid.vcxproj
@@ -0,0 +1,219 @@
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+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+    <ProjectConfiguration Include="Debug Library|Win32">
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+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
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+    <ProjectConfiguration Include="Release Library|Win32">
+      <Configuration>Release Library</Configuration>
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+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
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+    <Keyword>Win32Proj</Keyword>
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+  <Import Project="$(SolutionDir)\zlib.props" />
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+    <ConfigurationType>Application</ConfigurationType>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>libpng15.lib;zlib.lib</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
+      <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+    </Link>
+    <CustomBuildStep>
+      <Message>Executing PNG validation program</Message>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
+    </CustomBuildStep>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'">
+    <ClCompile>
+      <WarningLevel>Level4</WarningLevel>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <Optimization>Full</Optimization>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>false</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <DisableSpecificWarnings>4996;4127</DisableSpecificWarnings>
+      <CompileAsManaged>false</CompileAsManaged>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <StringPooling>true</StringPooling>
+      <MinimalRebuild>false</MinimalRebuild>
+      <BrowseInformation>true</BrowseInformation>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
+      <FloatingPointExceptions>false</FloatingPointExceptions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>libpng15.lib;zlib.lib</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(OutDir)</AdditionalLibraryDirectories>
+      <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+    </Link>
+    <CustomBuildStep>
+      <Message>Executing PNG validation program</Message>
+      <Command>$(OutDir)pngvalid.exe ..\..\..\pngvalid.png $(IntDir)pngout.png</Command>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
+    </CustomBuildStep>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\pngvalid.c" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@

 VisualStudio instructions

-libpng version 1.5.0beta30 - June 22, 2010
+libpng version 1.5.3beta01 - April 1, 2011

 Copyright (c) 1998-2010 Glenn Randers-Pehrson

@@ -15,21 +15,11 @@ You should be familiar with VisualStudio before using this directory.

 Initial preparations
 ====================
-You should install the 'official' build of zlib on your system - follow the
-instructions provided on http://www.zlib.net.  When a new release is being
-made of zlib the instructions disappear for a while until the new official
-build is available.  You will have to wait.
-
 You must enter some information in zlib.props before attempting to build
 with this 'solution'.  Please read and edit zlib.props first.  You will
 probably not be familiar with the contents of zlib.props - do not worry,
 it is mostly harmless.

-Make sure that your official build layout matches the requirements listed
-in zlib.props.  Prior to zlib-1.2.4 the official build (1.2.3) placed
-include and library files in different directories - if you find this
-has happened just put them all in the same directory.
-
 This is all you need to do to build the 'release' and 'release library'
 configurations.

@@ -40,6 +30,25 @@ information is produced (in the .pdb), but if you encounter a problem the
 optimization may make it difficult to debug.  Simply rebuild with a lower
 optimization level (e.g. /Od.)

+Linking your application
+========================
+Normally you should link against the 'release' configuration.  This builds a
+DLL for libpng 1.5 with the default runtime options used by Visual Studio
+2010.  In particular the runtime library is the "MultiThreaded DLL" version.
+If you use Visual Studio defaults to build your application you will have no
+problems.
+
+If you don't use the Visual Studio defaults your application must still be built
+with the default runtime option (/MD).  If, for some reason, it is not then your
+application will crash inside libpng15.dll as soon as libpng tries to read
+from a file handle you pass in.
+
+If you do not want to use the DLL, for example for a very small application,
+the 'release library' configuration may be more appropriate.  This is built
+with a non-standard runtime library - the "MultiThreaded" version.  When you
+build your application it must be compiled with this option (/MT), otherwise
+it will not build (if you are lucky) or crash (if you are not.)
+
 Stop reading here
 =================
 You have enough information to build a working application.
@@ -51,37 +60,5 @@ do not need these unless your own solution itself uses debug builds (it is
 far more effective to debug on the release builds, there is no point building
 a special debug build.)

-If, despite the previous paragraph, you still feel you need a debug build you
-will have to download the zlib source as well (http://www.zlib.net) and include
-the directory where you unpack it in zlib.props.  This solution will then be
-able to build a minimal zlib sufficient for libpng.  This build is only
-suitable for making a debug libpng.
-
 The debug build of libpng is minimally supported.  Support for debug builds of
 zlib is also minimal.  You really don't want to do this.
-
-This solution only supports the Multi-Threaded DLL C Runtime
-============================================================
-If you examine the solution you will find that it very deliberately lists
-exactly which MicroSoft DLLs it is linking against.  It explicitly links
-against msvcrt.lib.  The debug version links against msvcrtd.lib (this is
-why it is a debug version - it's nothing to do with having any special
-debug support, it doesn't).
-
-These versions of the MicroSoft C runtime correspond to the compiler flags
-/MD (release) and /MDd (debug) - the "Multi-Threaded DLL" implementation of the
-C runtime library.
-
-If you need to change this then you will have to make sure that both the
-compiler flags and the ".lib" in the linker dependences match up.  Fortunately
-neither zlib nor libpng require libraries other than a C runtime and
-kernel32.
-
-You cannot pass (FILE*) objects from a different runtime (including msvcrtd
-to msvcrt) to libpng.  If you do then your program will crash within libpng
-when it first makes a file read or write call.
-
-It is likely if you have read this far that you have found you can't avoid
-having multiple C runtimes in your program.  This is OK, it does work, but
-you will have to implement the libpng file read/write callbacks rather than
-using the internal libpng default.  This is easy.
--- a/projects/vstudio/vstudio.sln
+++ b/projects/vstudio/vstudio.sln
@@ -1,17 +1,28 @@
-
 Microsoft Visual Studio Solution File, Format Version 11.00
-# Visual C++ Express 2010
+# Visual Studio 2010
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng\libpng.vcxproj", "{D6973076-9317-4EF2-A0B8-B7A18AC0713E}"
 	ProjectSection(ProjectDependencies) = postProject
-		{E5A897B8-320E-6490-784B-11B374DD242A} = {E5A897B8-320E-6490-784B-11B374DD242A}
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867} = {64CE4900-97EA-2DD5-4226-F2E36FFF2867}
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngtest", "pngtest\pngtest.vcxproj", "{228BA965-50D5-42B2-8BCF-AFCC227E3C1D}"
 	ProjectSection(ProjectDependencies) = postProject
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867} = {64CE4900-97EA-2DD5-4226-F2E36FFF2867}
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35}
 		{D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E}
 	EndProjectSection
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib\zlib.vcxproj", "{E5A897B8-320E-6490-784B-11B374DD242A}"
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib\zlib.vcxproj", "{64CE4900-97EA-2DD5-4226-F2E36FFF2867}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngvalid", "pngvalid\pngvalid.vcxproj", "{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}"
+	ProjectSection(ProjectDependencies) = postProject
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867} = {64CE4900-97EA-2DD5-4226-F2E36FFF2867}
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35}
+		{D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pnglibconf", "pnglibconf\pnglibconf.vcxproj", "{EB33566E-DA7F-4D28-9077-88C0B7C77E35}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -37,12 +48,30 @@ Global
 		{228BA965-50D5-42B2-8BCF-AFCC227E3C1D}.Release Library|Win32.Build.0 = Release Library|Win32
 		{228BA965-50D5-42B2-8BCF-AFCC227E3C1D}.Release|Win32.ActiveCfg = Release|Win32
 		{228BA965-50D5-42B2-8BCF-AFCC227E3C1D}.Release|Win32.Build.0 = Release|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Debug Library|Win32.ActiveCfg = Debug Library|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Debug Library|Win32.Build.0 = Debug Library|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Debug|Win32.ActiveCfg = Debug|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Debug|Win32.Build.0 = Debug|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Release Library|Win32.ActiveCfg = Debug|Win32
-		{E5A897B8-320E-6490-784B-11B374DD242A}.Release|Win32.ActiveCfg = Debug|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Debug Library|Win32.ActiveCfg = Debug Library|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Debug Library|Win32.Build.0 = Debug Library|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Debug|Win32.ActiveCfg = Debug|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Debug|Win32.Build.0 = Debug|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Release Library|Win32.ActiveCfg = Release Library|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Release Library|Win32.Build.0 = Release Library|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Release|Win32.ActiveCfg = Release|Win32
+		{64CE4900-97EA-2DD5-4226-F2E36FFF2867}.Release|Win32.Build.0 = Release|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Debug Library|Win32.ActiveCfg = Debug Library|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Debug Library|Win32.Build.0 = Debug Library|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Debug|Win32.Build.0 = Debug|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Release Library|Win32.ActiveCfg = Release Library|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Release Library|Win32.Build.0 = Release Library|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Release|Win32.ActiveCfg = Release|Win32
+		{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}.Release|Win32.Build.0 = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Debug Library|Win32.ActiveCfg = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Debug Library|Win32.Build.0 = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Debug|Win32.ActiveCfg = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Debug|Win32.Build.0 = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Release Library|Win32.ActiveCfg = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Release Library|Win32.Build.0 = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Release|Win32.ActiveCfg = Release|Win32
+		{EB33566E-DA7F-4D28-9077-88C0B7C77E35}.Release|Win32.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
- * zlib.props - location of zlib source and build
+ * zlib.props - location of zlib source
 *
- * libpng version 1.5.0beta30 - June 22, 2010
+ * libpng version 1.5.3beta01 - April 1, 2011
 *
 * Copyright (c) 1998-2010 Glenn Randers-Pehrson
 *
@@ -11,32 +11,19 @@
 * and license in png.h

 * You must edit this file to record the location of the zlib
- * official and debug builds unless they are in the default
- * directories:
-
- *   official: zlib1
- *   debug:    zlib debug
+ * source code.
 -->

-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0"
+   xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup Label="Globals">
-    <!-- Place the name of the directory containing the official
-         build of zlib and the corresponding header files in this
-         property.  The directory is expected to contain at least:
-
-            zdll.lib  # The DLL import library
-            zlib.lib  # The static library
-            zlib.h    # The header file
-            zconf.h   # Another header file included by zlib.h
-     -->
-    <ZLib1Dir>..\..\..\..\zlib124-dll\zlib-1.2.4</ZLib1Dir>
-
-    <!-- Place the name of the directory containing the source of
-         zlib used for debugging in this property.
-         The directory need only contain the '.c' and '.h' files
-         from the source.  For your own sanity make sure that the
-         '.h' files in the source match those from the 'official'
-         build above.
+    <!-- Place the name of the directory containing the source of zlib used for
+	 debugging in this property.
+         The directory need only contain the '.c' and '.h' files from the
+	 source.
+	 If you use a relative directory name (as below) then it must be
+	 relative to the project directories; these are one level deepers than
+	 the directories containing this file.
     -->
    <ZLibSrcDir>..\..\..\..\zlib-1.2.4</ZLibSrcDir>
  </PropertyGroup>
--- a/projects/vstudio/zlib/zlib.vcxproj
+++ b/projects/vstudio/zlib/zlib.vcxproj
@@ -9,6 +9,14 @@
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release Library|Win32">
+      <Configuration>Release Library</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
  </ItemGroup>
  <ItemGroup>
    <ClCompile Include="$(ZLibSrcDir)\adler32.c" />
@@ -28,62 +36,60 @@
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <Import Project="$(SolutionDir)\zlib.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>DynamicLibrary</ConfigurationType>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug Library|Win32'" Label="Configuration">
    <ConfigurationType>StaticLibrary</ConfigurationType>
  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug Library|Win32'" Label="PropertySheets">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <LinkIncremental>false</LinkIncremental>
-  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug Library|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <ClCompile>
-      <PreprocessorDefinitions>WIN32;ZLIB_DLL;_DEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-      <WarningLevel>Level3</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <Optimization>Disabled</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-    </ClCompile>
-    <Link>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <SubSystem>Windows</SubSystem>
-      <Version>1</Version>
-      <AdditionalDependencies>msvcrtd.lib;kernel32.lib</AdditionalDependencies>
-      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
-    </Link>
-  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug Library|Win32'">
    <ClCompile>
      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-      <WarningLevel>Level3</WarningLevel>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <WarningLevel>TurnOffAllWarnings</WarningLevel>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <Optimization>Disabled</Optimization>
+      <BrowseInformation>true</BrowseInformation>
    </ClCompile>
    <Link>
      <TargetMachine>MachineX86</TargetMachine>
@@ -91,10 +97,66 @@
      <SubSystem>Windows</SubSystem>
    </Link>
  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <WarningLevel>TurnOffAllWarnings</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <Optimization>Disabled</Optimization>
+      <BrowseInformation>true</BrowseInformation>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX86</TargetMachine>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Windows</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <Optimization>Full</Optimization>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <BrowseInformation>true</BrowseInformation>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX86</TargetMachine>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Windows</SubSystem>
+    </Link>
+    <Lib>
+      <LinkTimeCodeGeneration>true</LinkTimeCodeGeneration>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <Optimization>Full</Optimization>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <WholeProgramOptimization>true</WholeProgramOptimization>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <BrowseInformation>true</BrowseInformation>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <TreatWarningAsError>true</TreatWarningAsError>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX86</TargetMachine>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Windows</SubSystem>
+    </Link>
+    <Lib>
+      <LinkTimeCodeGeneration>true</LinkTimeCodeGeneration>
+    </Lib>
+  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;DEBUGZLIB_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <WarningLevel>Level3</WarningLevel>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
    </ClCompile>
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,9 +1,9 @@

-Makefiles for  libpng version 1.5.0beta30 - June 22, 2010
+Makefiles for  libpng version 1.5.3beta01 - April 1, 2011

-pnglibconf.h       =>  Stores configuration settings
+pnglibconf.h.prebuilt       =>  Stores configuration settings
 makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.0beta30)
+                       (gcc, creates libpng15.so.15.1.5.3beta01)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.knr      =>  Archaic UNIX Makefile that converts files with
                       ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@ pnglibconf.h       =>  Stores configuration settings
 makefile.dec      =>  DEC Alpha UNIX makefile
 makefile.dj2      =>  DJGPP 2 makefile
 makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng15.so.15.1.5.0beta30)
+                       (gcc, creates libpng15.so.15.1.5.3beta01)
 makefile.freebsd  =>  FreeBSD makefile
 makefile.gcc      =>  Generic gcc makefile
 makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@ pnglibconf.h       =>  Stores configuration settings
 makefile.os2      =>  OS/2 Makefile (gcc and emx, requires libpng.def)
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng15.so.15.1.5.0beta30)
+                       creates libpng15.so.15.1.5.3beta01)
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.0beta30)
+                       creates libpng15.so.15.1.5.3beta01)
 makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.0beta30)
+                       creates libpng15.so.15.1.5.3beta01)
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.sunos    =>  Sun makefile
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
--- a/scripts/checksym.awk
+++ b/scripts/checksym.awk
@@ -12,14 +12,15 @@
 # work with any awk

 BEGIN{
-    err=0
-    master=""         # master file
-    official[1] = ""  # defined symbols from master file
-    symbol[1] = ""    # defined symbols from png.h
-    removed[1] = ""   # removed symbols from png.h
-    lasto = 0         # last ordinal value from png.h
-    mastero = 0       # highest ordinal in master file
-    symbolo = 0       # highest ordinal in png.h
+   err=0
+   master=""        # master file
+   official[1] = "" # defined symbols from master file
+   symbol[1] = ""   # defined symbols from png.h
+   removed[1] = ""  # removed symbols from png.h
+   lasto = 0        # last ordinal value from png.h
+   mastero = 0      # highest ordinal in master file
+   symbolo = 0      # highest ordinal in png.h
+   missing = "error"# log an error on missing symbols
 }

 # Read existing definitions from the master file (the first
@@ -29,23 +30,30 @@ BEGIN{
 #   symbol @ordinal
 #
 master == "" {
-    master = FILENAME;
+   master = FILENAME
 }
 FILENAME==master && NF==2 && $2~/^@/ && $1!~/^;/ {
-    o=0+substr($2,2)
-    if (o > 0) {
-	if (official[o] == "") {
-	    official[o] = $1
-	    if (o > mastero) mastero = o
-	    next
-	} else
-	    print master ": duplicated symbol:", official[o] ":", $0
-    } else
-	print master ": bad export line format:", $0
-    err = 1
+   o=0+substr($2,2)
+   if (o > 0) {
+      if (official[o] == "") {
+         official[o] = $1
+         if (o > mastero) mastero = o
+         next
+      } else
+         print master ": duplicated symbol:", official[o] ":", $0
+   } else
+      print master ": bad export line format:", $0
+   err = 1
+}
+FILENAME==master && $1==";missing" && NF==2{
+   # This allows the master file to control how missing symbols
+   # are handled; symbols that aren't in either the master or
+   # the new file.  Valid values are 'ignore', 'warning' and
+   # 'error'
+   missing = $2
 }
 FILENAME==master {
-    next
+   next
 }

 # Read new definitions, these are free form but the lines must
@@ -54,102 +62,100 @@ FILENAME==master {
 # than PNG_EXPORT.  Use symbols.dfn or pngwin.dfn to generate the
 # input file.
 #
-#  symbol @ordinal     # two fields, exported symbol
-#  ; symbol @ordinal   # three fields, removed symbol
-#  ; @ordinal          # two fields, the last ordinal
+#  symbol @ordinal   # two fields, exported symbol
+#  ; symbol @ordinal # three fields, removed symbol
+#  ; @ordinal        # two fields, the last ordinal
 NF==2 && $1 == ";" && $2 ~ /^@[1-9][0-9]*$/ { # last ordinal
-    o=0+substr($2,2)
-    if (lasto == 0 || lasto == o)
-	lasto=o
-    else {
- 	print "png.h: duplicated last ordinal:", lasto, o
-	err = 1
-    }
-    next
+   o=0+substr($2,2)
+   if (lasto == 0 || lasto == o)
+      lasto=o
+   else {
+      print "png.h: duplicated last ordinal:", lasto, o
+      err = 1
+   }
+   next
 }
 NF==3 && $1 == ";" && $3 ~ /^@[1-9][0-9]*$/ { # removed symbol
-    o=0+substr($3,2)
-    if (removed[o] == "" || removed[o] == $2) {
-	removed[o] = $2
-	if (o > symbolo) symbolo = o
-    } else {
-	print "png.h: duplicated removed symbol",
-		o ": '" removed[o] "' != '" $2 "'"
-	err = 1
-    }
-    next
+   o=0+substr($3,2)
+   if (removed[o] == "" || removed[o] == $2) {
+      removed[o] = $2
+      if (o > symbolo) symbolo = o
+   } else {
+      print "png.h: duplicated removed symbol", o ": '" removed[o] "' != '" $2 "'"
+      err = 1
+   }
+   next
 }
 NF==2 && $2 ~ /^@[1-9][0-9]*$/ { # exported symbol
-    o=0+substr($2,2)
-    if (symbol[o] == "" || symbol[o] == $1) {
-    	symbol[o] = $1
-	if (o > symbolo) symbolo = o
-    } else {
-	print "png.h: duplicated symbol",
-		o ": '" symbol[o] "' != '" $1 "'"
-	err = 1
-    }
+   o=0+substr($2,2)
+   if (symbol[o] == "" || symbol[o] == $1) {
+      symbol[o] = $1
+      if (o > symbolo) symbolo = o
+   } else {
+      print "png.h: duplicated symbol", o ": '" symbol[o] "' != '" $1 "'"
+      err = 1
+   }
 }
 {
-    next # skip all other lines
+   next # skip all other lines
 }

 # At the end check for symbols marked as both duplicated and removed
 END{
-    if (symbolo > lasto) {
-    	print "highest symbol ordinal in png.h,",
-		symbolo ", exceeds last ordinal from png.h", lasto
-	err = 1
-    }
-    if (mastero > lasto) {
-    	print "highest symbol ordinal in", master ",",
-		mastero ", exceeds last ordinal from png.h", lasto
-	err = 1
-    }
-    unexported=0
-    for (o=1; o<=lasto; ++o) {
-	if (symbol[o] == "" && removed[o] == "") {
-	    if (unexported == 0) unexported = o
-	    if (official[o] == "") {
-	    	# missing in export list too, so ok
-		if (o < lasto) continue
-	    }
-	}
-	if (unexported != 0) {
-	    # Symbols in the .def but not in the new file are errors
-	    if (o-1 > unexported)
-		print "png.h: warning: unexported symbol definitions:",
-		    unexported "-" o-1
-	    else
-		print "png.h: warning: unexported symbol definition:",
-		    unexported
-	    unexported = 0
-	}
-	if (symbol[o] != "" && removed[o] != "") {
-	    print "png.h: symbol", o,
-	      "both exported as '" symbol[o] "' and removed as '" removed[o] "'"
-	    err = 1
-	} else if (symbol[o] != official[o]) {
-	    # either the symbol is missing somewhere or it changed
-	    err = 1
-	    if (symbol[o] == "")
-		print "png.h: symbol", o,
-		    "is exported as '" official[o] "' in", master
-	    else if (official[o] == "")
-		print "png.h: exported symbol", o,
-		    "'" symbol[o] "' not present in", master
-	    else
-		print "png.h: exported symbol", o,
-		    "'" symbol[o] "' exists as '" official[o] "' in", master
-	}
+   if (symbolo > lasto) {
+      print "highest symbol ordinal in png.h,", symbolo ", exceeds last ordinal from png.h", lasto
+      err = 1
+   }
+   if (mastero > lasto) {
+      print "highest symbol ordinal in", master ",", mastero ", exceeds last ordinal from png.h", lasto
+      err = 1
+   }
+   unexported=0
+   for (o=1; o<=lasto; ++o) {
+      if (symbol[o] == "" && removed[o] == "") {
+         if (unexported == 0) unexported = o
+         if (official[o] == "") {
+            # missing in export list too, so ok
+            if (o < lasto) continue
+         }
+      }
+      if (unexported != 0) {
+         # Symbols in the .def but not in the new file are errors, but
+         # the 'unexported' symbols aren't in either.  By default this
+         # is an error too (see the setting of 'missing' at the start),
+         # but this can be reset on the command line or by stuff in the
+         # file - see the comments above.
+         if (missing != "ignore") {
+            if (o-1 > unexported)
+               print "png.h:", missing ": missing symbols:", unexported "-" o-1
+            else
+               print "png.h:", missing ": missing symbol:", unexported
+            if (missing != "warning")
+               err = 1
+         }
+         unexported = 0
+      }
+      if (symbol[o] != "" && removed[o] != "") {
+         print "png.h: symbol", o, "both exported as '" symbol[o] "' and removed as '" removed[o] "'"
+         err = 1
+      } else if (symbol[o] != official[o]) {
+         # either the symbol is missing somewhere or it changed
+         err = 1
+         if (symbol[o] == "")
+            print "png.h: symbol", o, "is exported as '" official[o] "' in", master
+         else if (official[o] == "")
+            print "png.h: exported symbol", o, "'" symbol[o] "' not present in", master
+         else
+            print "png.h: exported symbol", o, "'" symbol[o] "' exists as '" official[o] "' in", master
+      }

-	# Finally generate symbols.new
-	if (symbol[o] != "")
-	    print " " symbol[o], "@" o > "symbols.new"
-    }
+      # Finally generate symbols.new
+      if (symbol[o] != "")
+         print " " symbol[o], "@" o > "symbols.new"
+   }

-    if (err != 0) {
-	print "*** A new list is in symbols.new ***"
-	exit 1
-    }
+   if (err != 0) {
+      print "*** A new list is in symbols.new ***"
+      exit 1
+   }
 }
--- a/scripts/chkfmt
+++ b/scripts/chkfmt
@@ -0,0 +1,137 @@
+#!/bin/sh
+#
+# Check the format of the source files in the current directory - checks for a
+# line length of 80 characters max and no tab characters.
+#
+# Optionally arguments are files or directories to check.
+#
+# -v: output the long lines (makes fixing them easier)
+# -e: spawn an editor for each file that needs a change ($EDITOR must be
+#     defined).  When using -e the script MUST be run from an interactive
+#     command line.
+verbose=
+edit=
+vers=
+test "$1" = "-v" && {
+   shift
+   verbose=yes
+}
+test "$1" = "-e" && {
+   shift
+   if test -n "$EDITOR"
+   then
+      edit=yes
+
+      # Copy the standard streams for the editor
+      exec 3>&0 4>&1 5>&2
+   else
+      echo "chkfmt -e: EDITOR must be defined" >&2
+      exit 1
+   fi
+}
+
+# Function to edit a single file - if the file isn't changed ask the user
+# whether or not to continue.  This stuff only works if the script is run from
+# the command line (otherwise, don't specify -e or you will be sorry).
+doed(){
+   cp "$file" "$file".orig
+   "$EDITOR" "$file" 0>&3 1>&4 2>&5 3>&- 4>&- 5>&- || exit 1
+   if cmp -s "$file".orig "$file"
+   then
+      rm "$file".orig
+      echo -n "$file: file not changed, type anything to continue: " >&5
+      read ans 0>&3
+      test -n "$ans" || return 1
+   fi
+   return 0
+}
+
+# In beta versions the version string which appears in files can be a little
+# long and cause spuriously overlong lines.  To avoid this subtitute the version
+# string with a 'standard' version a.b.cc before checking for long lines.
+if test -r png.h
+then
+   vers="`sed -n -e \
+   's/^#define PNG_LIBPNG_VER_STRING .\([0-9]\.[0-9]\.[0-9][0-9a-z]*\).$/\1/p' \
+   png.h`"
+   echo "chkfmt: checking version $vers"
+fi
+if test -z "$vers"
+then
+   echo "chkfmt: png.h not found, ignoring version number" >&2
+fi
+
+test -n "$1" || set -- .
+find "$@" \( -type d \( -name '.git' -o -name '.libs' -o -name 'projects' \) \
+   -prune \) -o \( -type f \
+   ! -name '*.[oa]' ! -name '*.l[oa]' !  -name '*.png' ! -name '*.out' \
+   ! -name '*.jpg' ! -name '*.patch' ! -name '*.obj' ! -name '*.exe' \
+   ! -name '*.com' ! -name '*.tar.*' ! -name '*.zip' ! -name '*.ico' \
+   ! -name '*.res' ! -name '*.rc' ! -name '*.mms' ! -name '*.rej' \
+   ! -name '*.dsp' ! -name '*.orig' ! -name '*.dfn' ! -name '*.swp' \
+   ! -name '~*' ! -name '*.3' \
+   ! -name 'missing' ! -name 'mkinstalldirs' ! -name 'depcomp' \
+   ! -name 'aclocal.m4' ! -name 'install-sh' ! -name 'Makefile.in' \
+   ! -name 'ltmain.sh' ! -name 'config*' -print \) | {
+   st=0
+   while read file
+   do
+      case "$file" in
+      *.mak|*[Mm]akefile.*|*[Mm]akefile)
+         # Makefiles require tabs, dependency lines can be this long.
+         check_tabs=
+         line_length=100;;
+      *.awk)
+         # Includes literal tabs
+         check_tabs=
+         # The following is arbitrary
+         line_length=132;;
+      *contrib/*/*.[ch])
+         check_tabs=yes
+         line_length=96;;
+      *)
+         check_tabs=yes
+         line_length=80;;
+      esac
+
+      # Note that vers can only contain 0-9, . and a-z
+      if test -n "$vers"
+      then
+         sed -e "s/$vers/a.b.cc/g" "$file" >"$file".$$
+      else
+         cp "$file" "$file".$$
+      fi
+      splt="`fold -$line_length "$file".$$ | diff -c "$file".$$ -`"
+      rm "$file".$$
+
+      if test -n "$splt"
+      then
+         echo "$file: lines too long"
+         st=1
+         if test -n "$EDITOR" -a -n "$edit"
+         then
+            doed "$file" || exit 1
+         elif test -n "$verbose"
+         then
+            echo "$splt"
+         fi
+      fi
+      if test -n "$check_tabs"
+      then
+         tab="`tr -c -d '\t' <"$file"`"
+         if test -n "$tab"
+         then
+            echo "$file: file contains tab characters"
+            st=1
+            if test -n "$EDITOR" -a -n "$edit"
+            then
+               doed "$file" || exit 1
+            elif test -n "$verbose"
+            then
+               echo "$splt"
+            fi
+         fi
+      fi
+   done
+   exit $st
+}
--- a/scripts/def.dfn
+++ b/scripts/def.dfn
@@ -0,0 +1,38 @@
+/* def.dfn - define format of libpng.def
+ *
+ * Last changed in libpng version 1.5.0 [(PENDING RELEASE)]
+ * Copyright (c) 2010-2011 Glenn Randers-Pehrson
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* These macros exist to make the header and trailer shorter below: */
+#define S PNG_DEFN_MAGIC
+#define E PNG_DEFN_END
+
+/* Write the export file header: */
+S-;---------------------------------------------------------------E
+S-; LIBPNG module definition file for OS/2-E
+S-;---------------------------------------------------------------E
+S--E
+S-; If you give the library an explicit name one or other files-E
+S-; may need modifying to support the new name on one or more-E
+S-; systems.-E
+S-LIBRARY-E
+S-OS2 DESCRIPTION "PNG image compression library"-E
+S-OS2 CODE PRELOAD MOVEABLE DISCARDABLE-E
+S--E
+S-EXPORTS-E
+S-;Version 1.5.0beta58-E
+
+/* NOTE: @@@ is interpreted by the calling script as a signal to
+ * join the two things on either side, so we can do symbol
+ * substitution within the name, regular C ## joins the pp-tokens,
+ * not their final values.
+ */
+#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
+	PNG_DEFN_MAGIC- SYMBOL_PREFIX @@@ name-PNG_DEFN_END
+
+#include "../png.h"
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@

 # Modeled after libxml-config.

-version=1.5.0beta30
+version=1.5.3beta01
 prefix=""
 libdir=""
 libs=""
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng15

 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.5.0beta30
+Version: 1.5.3beta01
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -1,6 +1,6 @@
 # makefile for libpng on Solaris 2.x with cc
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -1,6 +1,6 @@
 # makefile for libpng on Solaris 2.x with cc
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -43,8 +43,8 @@ $(AR) libpng.lib r $(OBJS)

 $(OBJS): pngpriv.h png.h pngconf.h pnglibconf.h pnginfo.h pngstruct.h pngdebug.h

-pnglibconf.h: scripts/pnglibconf.h
-$(CP) scripts/pnglibconf.h pnglibconf.h
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+$(CP) scripts/pnglibconf.h.prebuilt pnglibconf.h

 pngtest: pngtest.o libpng.lib
 $(LN) <WITH <
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -40,8 +40,8 @@ $(LBR): $(OBJS)

 $(OBJS): pngpriv.h png.h pngconf.h pnglibconf.h pnginfo.h pngstruct.h pngdebug.h

-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h pnglibconf.h
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt pnglibconf.h

 pngtest.ttp: pngtest.o $(LBR)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o$@ pngtest.o
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -111,8 +111,8 @@ test: pngtest.exe

 # see scripts\pnglibconf.mak for how to make this file
 # with different options
-pnglibconf.h: scripts\pnglibconf.h
-	copy scripts\pnglibconf.h $@
+pnglibconf.h: scripts\pnglibconf.h.prebuilt
+	copy scripts\pnglibconf.h.prebuilt $@

 png.obj: png.c png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
 pngerror.obj: pngerror.c png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -1,6 +1,6 @@
 # makefile for libpng on BeOS x86 ELF with gcc
 # modified from makefile.linux by Sander Stoks
-# Copyright (C) 2002, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
@@ -79,8 +79,8 @@ OBJSDLL = $(OBJS)
 all: libpng.a $(LIBSO) pngtest libpng.pc libpng-config

 # try include scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h $@
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt $@

 libpng.a: $(OBJS)
 	$(AR_RC) $@ $(OBJS)
--- a/scripts/makefile.bor
+++ b/scripts/makefile.bor
@@ -109,8 +109,8 @@ LIBNAME=libpng$(MODEL).lib
 all: libpng pngtest

 # try !inlude scripts\pnglibconf.mak for more options
-pnglibconf.h: scripts\pnglibconf.h
-	copy scripts\pnglibconf.h $@
+pnglibconf.h: scripts\pnglibconf.h.prebuilt
+	copy scripts\pnglibconf.h.prebuilt $@

 libpng: $(LIBNAME)

--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -23,7 +23,7 @@

 VERMAJ = 1
 VERMIN = 5
-VERMIC = 0
+VERMIC = 3
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)
@@ -64,7 +64,10 @@ copy-src:

 compilation:
 	@echo " * Compilation of $(PACKAGE)"
-	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_CONSOLE_IO_SUPPORTED -D_WIN32_WCE=0x0420" CFLAGS="$(CFLAGS) -mms-bitfields -O3 -pipe -fomit-frame-pointer" LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" ./configure --prefix=/opt/wince --host=arm-mingw32ce && make
+	cd $(PACKAGE) && CPPFLAGS="$(CPPFLAGS) -DPNG_CONSOLE_IO_SUPPORTED -D_WIN32_WCE=0x0420" \
+		CFLAGS="$(CFLAGS) -mms-bitfields -O3 -pipe -fomit-frame-pointer" \
+		LDFLAGS="$(LDFLAGS) -Wl,--enable-auto-import -Wl,-s" \
+		./configure --prefix=/opt/wince --host=arm-mingw32ce && make

 copy:
 	@echo " * Copy of binary and development files"
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -1,5 +1,5 @@
 # makefile for libpng on Darwin / Mac OS X
-# Copyright (C) 2002, 2004, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2004, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 2001 Christoph Pfisterer
 # derived from makefile.linux:
 #  Copyright (C) 1998, 1999 Greg Roelofs
@@ -76,8 +76,8 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 all: libpng.a $(LIBSO) pngtest libpng.pc libpng-config

 # see scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h $@
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt $@

 libpng.a: $(OBJS)
 	$(AR_RC) $@ $(OBJS)
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -1,5 +1,5 @@
 # makefile for libpng on DEC Alpha Unix
-# Copyright (C) 2000-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2000-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
@@ -63,8 +63,8 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 all: $(LIBSO) libpng.a pngtest libpng.pc libpng-config

 # see scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h $@
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt $@

 libpng.a: $(OBJS)
 	$(AR_RC) $@  $(OBJS)
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -1,5 +1,5 @@
 # DJGPP (DOS gcc) makefile for libpng
-# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009-2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
@@ -13,7 +13,7 @@ INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib

 CC=gcc
-CFLAGS=-I../zlib -O
+CFLAGS=-I../zlib -O -DPNG_NO_SNPRINTF
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm

 RANLIB=ranlib
@@ -25,8 +25,8 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 all: libpng.a pngtest

 # see scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h $@
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt $@

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so on Linux ELF with gcc
-# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010 Greg Roelofs
+# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010-2011 Greg Roelofs
 # and Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
@@ -96,8 +96,8 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 all: libpng.a $(LIBSO) pngtest pngtest-static libpng.pc libpng-config

 # see scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h
-	cp scripts/pnglibconf.h $@
+pnglibconf.h: scripts/pnglibconf.h.prebuilt
+	cp scripts/pnglibconf.h.prebuilt $@

 libpng.a: $(OBJS)
 	$(AR_RC) $@ $(OBJS)
--- a/Show More
+++ b/Show More