[devel] Imported from libpng-1.5.3beta05.tar

This was because the attempt to reset the zlib stream in png_write_IDAT
happened after the first IDAT chunk had been deflated - much too late.
In this change internal functions are added to claim/release the z_stream
and, hopefully, make the code more robust.  Also deflateEnd checking is
added - previously libpng would ignore an error at the end of the stream.

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.1beta01 - January 8, 2011
+Libpng 1.5.3beta05 - May 6, 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.
@@ -9,31 +9,94 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.5.1beta01.tar.xz (LZMA-compressed, recommended)
-   1.5.1beta01.tar.gz
-   1.5.1beta01.tar.bz2
+   1.5.3beta05.tar.xz (LZMA-compressed, recommended)
+   1.5.3beta05.tar.gz
+   1.5.3beta05.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp151b01.7z  (LZMA-compressed, recommended)
-   lp151b01.zip
+   lp153b05.7z  (LZMA-compressed, recommended)
+   lp153b05.zip
 
 Other information:
 
-   1.5.1beta01-README.txt
-   1.5.1beta01-LICENSE.txt
+   1.5.3beta05-README.txt
+   1.5.3beta05-LICENSE.txt
 
-Changes since the last public release (1.5.0):
+Changes since the last public release (1.5.2):
+
+Version 1.5.3beta01 [April 1, 2011]
+  Re-initialize the zlib compressor before compressing non-IDAT chunks.
+  Added API functions to set parameters for zlib compression of non-IDAT
+    chunks.
+
+Version 1.5.3beta02 [April 3, 2011]
+  Updated scripts/symbols.def with new API functions.
+  Only compile the new zlib re-initializing code when text or iCCP is
+    supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
+  Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
+  Optimize the zlib CMF byte in non-IDAT compressed chunks
+
+Version 1.5.3beta03 [April 16, 2011]
+  Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
+    snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
+    than __STDC__ (John Bowler).
+  Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
+    the compiler that a user supplied callback (the error handler) does not
+    return, yet there is no guarantee in practice that the application code
+    will correctly implement the error handler because the compiler only
+    issues a warning if there is a mistake (John Bowler).
+  Removed the no-longer-used PNG_DEPSTRUCT macro.
+  Updated the zlib version to 1.2.5 in the VStudio project.
+  Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
+    pngwutil.c (John Bowler).
+  Fixed bug with stripping the filler or alpha channel when writing, that
+    was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
+
+Version 1.5.3beta04 [April 27, 2011]
+  Updated pngtest.png with the new zlib CMF optimization.
+  Cleaned up conditional compilation code and of background/gamma handling
+    Internal changes only except a new option to avoid compiling the
+    png_build_grayscale_palette API (which is not used at all internally.)
+    The main change is to move the transform tests (READ_TRANSFORMS,
+    WRITE_TRANSFORMS) up one level to the caller of the APIs.  This avoids
+    calls to spurious functions if all transforms are disabled and slightly
+    simplifies those functions.  Pngvalid modified to handle this.
+    A minor change is to stop the strip_16 and expand_16 interfaces from
+    disabling each other; this allows the future alpha premultiplication
+    code to use 16-bit intermediate values while still producing 8-bit output.
+    png_do_background and png_do_gamma have been simplified to take a single
+    pointer to the png_struct rather than pointers to every item required
+    from the png_struct. This makes no practical difference to the internal
+    code.
+  A serious bug in the pngvalid internal routine 'standard_display_init' has
+    been fixed - this failed to initialize the red channel and accidentally
+    initialized the alpha channel twice.
+  Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
+    avoid a clash with the png_jmpbuf macro on some platforms.
+
+Version 1.5.3beta05 [May 6, 2011]
+  Added appropriate feature test macros to ensure libpng sees the correct API
+   _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and pngvalid.c to ensure
+    that POSIX conformant systems disable non-POSIX APIs.  _ISOC99_SOURCE is
+    defined in pngpriv.h to obtain the ISO C99 snprintf definition, when
+    available.
+  Removed png_snprintf and added formatted warning messages.  This change adds
+    internal APIs to allow png_warning messages to have parameters without
+    requiring the host OS to implement snprintf.  As a side effect the
+    dependency of the tIME-supporting RFC1132 code on stdio is removed and
+    PNG_NO_WARNINGS does actually work now.
+  Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
+    optimization configureable.
+  IDAT compression failed if preceded by a compressed text chunk (bug
+    introduced in libpng-1.5.3beta01-02).  This was because the attempt to
+    reset the zlib stream in png_write_IDAT happened after the first IDAT
+    chunk had been deflated - much too late.  In this change internal
+    functions were added to claim/release the z_stream and, hopefully, make
+    the code more robust.  Also deflateEnd checking is added - previously
+    libpng would ignore an error at the end of the stream.
 
-Version 1.5.1beta01 [January 8, 2011]
-  Added description of png_set_crc_action() to the manual.
-  Added a note in the manual that the type of the iCCP profile was changed
-    from png_charpp to png_bytepp in png_get_iCCP().  This change happened
-    in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
-    it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
-  Ensure that png_rgb_to_gray ignores palette mapped images,
-  Fixed the failure to handle palette mapped images correctly.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit

CHANGES

@@ -3142,14 +3142,219 @@ Version 1.5.0rc07 [January 4, 2011]
 Version 1.5.0 [January 6, 2011]
   No changes.
 
-Version 1.5.1beta01 [January 8, 2011]
+version 1.5.1beta01 [January 8, 2011]
   Added description of png_set_crc_action() to the manual.
   Added a note in the manual that the type of the iCCP profile was changed
     from png_charpp to png_bytepp in png_get_iCCP().  This change happened
     in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
     it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
-  Ensure that png_rgb_to_gray ignores palette mapped images,
-  Fixed the failure to handle palette mapped images correctly.
+  Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
+    internally happens to call it with one.
+  Fixed a failure to handle palette mapped images correctly.
+
+Version 1.5.1beta02 [January 14, 2011]
+  Fixed a bug in handling of interlaced images (bero at arklinux.org).
+  Updated CMakeLists.txt (Clifford Yapp)
+
+Version 1.5.1beta03 [January 14, 2011]
+  Fixed typecasting of some png_debug() statements (Cosmin)
+
+Version 1.5.1beta04 [January 16, 2011]
+  Updated documentation of png_set|get_tRNS() (Thomas Klausner).
+  Mentioned in the documentation that applications must #include "zlib.h"
+    if they need access to anything in zlib.h, and that a number of
+    macros such as png_memset() are no longer accessible by applications.
+  Corrected pngvalid gamma test "sample" function to access all of the color
+    samples of each pixel, instead of sampling the red channel three times.
+  Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
+    warnings, and (mistakenly) changed png_exp() to exp().
+
+Version 1.5.1beta05 [January 16, 2011]
+  Changed variable names png_index, png_div, png_exp, and png_gamma to
+    char_index, divisor, exp_b10, and gamma_val, respectively, and
+    changed exp() back to png_exp().
+
+Version 1.5.1beta06 [January 20, 2011]
+  Prevent png_push_crc_skip() from hanging while reading an unknown chunk
+    or an over-large compressed zTXt chunk with the progressive reader.
+  Eliminated more GCC "shadow" warnings.
+  Revised png_fixed() in png.c to avoid compiler warning about reaching the
+    end without returning anything.
+
+Version 1.5.1beta07 [January 22, 2011]
+  In the manual, describe the png_get_IHDR() arguments in the correct order.
+  Added const_png_structp and const_png_infop types, and used them in
+    prototypes for most png_get_*() functions.
+
+Version 1.5.1beta08 [January 23, 2011]
+  Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
+  Added synopses for the IO_STATE functions and other missing synopses
+    to the manual. Removed the synopses from libpngpf.3 because they
+    were out of date and no longer useful.  Better information can be
+    obtained by reading the prototypes and comments in pngpriv.h
+  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
+    Added a make macro DFNCPP that is a CPP that will accept the tokens in
+    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
+    should fail if one is not available.
+  Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
+  Added png_get_current_row_number and png_get_current_pass_number for the
+    benefit of the user transform callback.
+  Added png_process_data_pause and png_process_data_skip for the benefit of
+    progressive readers that need to stop data processing or want to optimize
+    skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
+
+Version 1.5.1beta09 [January 24, 2011]
+  Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
+    pngvalid contains tests of transforms, which tests are currently disabled
+    because they are incompletely tested.  gray_to_rgb was failing to expand
+    the bit depth for smaller bit depth images; this seems to be a long
+    standing error and resulted, apparently, in invalid output.  The
+    documentation did not accurately describe what libpng really does when
+    converting RGB to gray.
+
+Version 1.5.1beta10 [January 27, 2010]
+  Fixed incorrect examples of callback prototypes in the manual, that were
+    introduced in libpng-1.0.0.
+  In addition the order of the png_get_uint macros with respect to the
+    relevant function definitions has been reversed.  This helps the
+    preprocessing of the symbol files be more robust.  Furthermore, the
+    symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
+    the library may actually be built with PNG_USE_READ_MACROS; this stops
+    the read macros interfering with the symbol file format.
+  Made the manual, synopses, and function prototypes use the function
+    argument names file_gamma, int_file_gamma, and srgb_intent consistently.
+
+Version 1.5.1beta11 [January 28, 2011]
+  Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
+  Corrected local variable type in new API png_process_data_skip()
+    The type was self-evidently incorrect but only causes problems on 64 bit
+    architectures.
+  Added transform tests to pngvalid and simplified the arguments.
+
+Version 1.5.1rc01 [January 29, 2011]
+  No changes.
+
+Version 1.5.1rc02 [January 31, 2011]
+  Added a request in the manual that applications do not use "png_" or
+    "PNG_" to begin any of their own symbols.
+  Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
+
+Version 1.5.1 [February 3, 2011]
+  No changes.
+
+Version 1.5.2beta01 [February 13, 2011]
+  More -Wshadow fixes for older gcc compilers.  Older gcc versions apparently
+    check formal parameters names in function declarations (as well as
+    definitions) to see if they match a name in the global namespace.
+  Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
+    old VisualC++ preprocessor.
+  Turned on interlace handling in png_read_png().
+  Fixed gcc pendantic warnings.
+  Handle longjmp in Cygwin.
+  Fixed png_get_current_row_number() in the interlaced case.
+  Cleaned up ALPHA flags and transformations.
+  Implemented expansion to 16 bits.
+
+Version 1.5.2beta02 [February 19, 2011]
+  Fixed mistake in the descriptions of user read_transform and write_transform
+    function prototypes in the manual.  The row_info struct is png_row_infop.
+  Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
+  Corrected png_get_current_row_number documentation
+  Fixed the read/write row callback documentation.
+    This documents the current behavior, where the callback is called after
+    every row with information pertaining to the next row.
+
+Version 1.5.2beta03 [March 3, 2011]
+  Fixed scripts/makefile.vcwin32
+  Updated contrib/pngsuite/README to add the word "modify".
+  Define PNG_ALLOCATED to blank when _MSC_VER<1300.
+
+Version 1.5.2rc01 [March 19, 2011]
+  Define remaining attributes to blank when MSC_VER<1300.
+  ifdef out mask arrays in pngread.c when interlacing is not supported.
+
+Version 1.5.2rc02 [March 22, 2011]
+  Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
+    and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
+    from the makefiles.
+  Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
+    to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
+
+Version 1.5.2rc03 [March 24, 2011]
+  Don't include standard header files in png.h while building the symbol table,
+    to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
+
+Version 1.5.2 [March 31, 2011]
+  No changes.
+
+Version 1.5.3beta01 [April 1, 2011]
+  Re-initialize the zlib compressor before compressing non-IDAT chunks.
+  Added API functions to set parameters for zlib compression of non-IDAT
+    chunks.
+
+Version 1.5.3beta02 [April 3, 2011]
+  Updated scripts/symbols.def with new API functions.
+  Only compile the new zlib re-initializing code when text or iCCP is
+    supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
+  Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
+  Optimize the zlib CMF byte in non-IDAT compressed chunks
+
+Version 1.5.3beta03 [April 16, 2011]
+  Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
+    snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
+    than __STDC__ (John Bowler).
+  Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
+    the compiler that a user supplied callback (the error handler) does not
+    return, yet there is no guarantee in practice that the application code
+    will correctly implement the error handler because the compiler only
+    issues a warning if there is a mistake (John Bowler).
+  Removed the no-longer-used PNG_DEPSTRUCT macro.
+  Updated the zlib version to 1.2.5 in the VStudio project.
+  Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
+    pngwutil.c (John Bowler).
+  Fixed bug with stripping the filler or alpha channel when writing, that
+    was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
+
+Version 1.5.3beta04 [April 27, 2011]
+  Updated pngtest.png with the new zlib CMF optimization.
+  Cleaned up conditional compilation code and of background/gamma handling
+    Internal changes only except a new option to avoid compiling the
+    png_build_grayscale_palette API (which is not used at all internally.)
+    The main change is to move the transform tests (READ_TRANSFORMS,
+    WRITE_TRANSFORMS) up one level to the caller of the APIs.  This avoids
+    calls to spurious functions if all transforms are disabled and slightly
+    simplifies those functions.  Pngvalid modified to handle this.
+    A minor change is to stop the strip_16 and expand_16 interfaces from
+    disabling each other; this allows the future alpha premultiplication
+    code to use 16-bit intermediate values while still producing 8-bit output.
+    png_do_background and png_do_gamma have been simplified to take a single
+    pointer to the png_struct rather than pointers to every item required
+    from the png_struct. This makes no practical difference to the internal
+    code.
+  A serious bug in the pngvalid internal routine 'standard_display_init' has
+    been fixed - this failed to initialize the red channel and accidentally
+    initialized the alpha channel twice.
+  Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
+    avoid a possible clash with the png_jmpbuf macro on some platforms.
+
+Version 1.5.3beta05 [May 6, 2011]
+  Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
+    correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
+    pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
+  Removed png_snprintf and added formatted warning messages.  This change adds
+    internal APIs to allow png_warning messages to have parameters without
+    requiring the host OS to implement snprintf.  As a side effect the
+    dependency of the tIME-supporting RFC1132 code on stdio is removed and
+    PNG_NO_WARNINGS does actually work now.
+  Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
+    optimization configureable.
+  IDAT compression failed if preceded by a compressed text chunk (bug
+    introduced in libpng-1.5.3beta01-02).  This was because the attempt to
+    reset the zlib stream in png_write_IDAT happened after the first IDAT
+    chunk had been deflated - much too late.  In this change internal
+    functions were added to claim/release the z_stream and, hopefully, make
+    the code more robust.  Also deflateEnd checking is added - previously
+    libpng would ignore an error at the end of the stream.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CMakeLists.txt

@@ -25,7 +25,7 @@ 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
@@ -33,7 +33,7 @@ enable_testing()
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
-set(PNGLIB_RELEASE 1)
+set(PNGLIB_RELEASE 3)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -240,28 +240,31 @@ 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 ${CMAKE_INSTALL_PREFIX}/lib)
+  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_LIBDIR})
+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 ${PNGLIB_NAME}.pc libpng.pc)
+_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 ${PNGLIB_NAME}-config
-  libpng-config)
+_png_generate_symlink_code(PNG_CONFIG_INSTALL_CODE
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
+  ${CMAKE_CURRENT_BINARY_DIR}/libpng-config)
 install(CODE ${PNG_CONFIG_INSTALL_CODE})
 
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.1beta01
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.3beta05
     VERSION 15.${PNGLIB_RELEASE}.0
     SOVERSION 15
     CLEAN_DIRECT_OUTPUT 1)
@@ -307,13 +310,23 @@ if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
     endif()
 
     if(NOT WIN32)
-      _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})
+      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()
 
@@ -323,13 +336,23 @@ if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
             LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
             ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     if(NOT WIN32 OR CYGWIN)
-      _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 ${CMAKE_INSTALL_LIBDIR})
+      IF(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+         _png_generate_symlink_code(PNG_STATIC_INSTALL_CODE
+${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 ${CMAKE_INSTALL_LIBDIR})
+      ENDIF(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
     endif()
   endif()
 endif()
@@ -367,7 +390,7 @@ if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
   install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
 endif()
 
-# what's with libpng-manual.txt and all the extra files?
+# what's with libpng-$VER%.txt and all the extra files?
 
 
 # UNINSTALL

LICENSE

@@ -10,8 +10,8 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.1beta01, January 8, 2011, are
-Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are
+libpng versions 1.2.6, August 15, 2004, through 1.5.3beta05, May 6, 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
-January 8, 2011
+May 6, 2011

Makefile.am

@@ -81,6 +81,13 @@ CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 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
@@ -111,15 +118,19 @@ scripts/pnglibconf.h.prebuilt:
 # '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@\
+	$(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
@@ -151,7 +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 $@

Makefile.in

@@ -177,6 +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@
@@ -348,9 +355,14 @@ 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
@@ -1278,7 +1290,7 @@ pngvalid.o pngtest.o: pnglibconf.h
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	$(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

README

@@ -1,4 +1,4 @@
-README for libpng version 1.5.1beta01 - January 8, 2011 (shared library 15.0)
+README for libpng version 1.5.3beta05 - May 6, 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.

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.68 for libpng 1.5.1beta01
+# Generated by GNU Autoconf 2.68 for libpng 1.5.3beta05.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -570,8 +570,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.5.1beta01'
-PACKAGE_STRING='libpng 1.5.1beta01'
+PACKAGE_VERSION='1.5.3beta05'
+PACKAGE_STRING='libpng 1.5.3beta05'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -627,6 +627,7 @@ HAVE_LD_VERSION_SCRIPT_TRUE
 LIBPNG_DEFINES
 LIBOBJS
 POW_LIB
+DFNCPP
 OTOOL64
 OTOOL
 LIPO
@@ -1306,7 +1307,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures libpng 1.5.1beta01 to adapt to many kinds of systems.
+\`configure' configures libpng 1.5.3beta05 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1376,7 +1377,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.5.1beta01:";;
+     short | recursive ) echo "Configuration of libpng 1.5.3beta05:";;
    esac
   cat <<\_ACEOF
 
@@ -1484,7 +1485,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.5.1beta01
+libpng configure 1.5.3beta05
 generated by GNU Autoconf 2.68
 
 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -1907,7 +1908,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.5.1beta01, which was
+It was created by libpng $as_me 1.5.3beta05, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   $ $0 $@
@@ -2722,7 +2723,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.5.1beta01'
+ VERSION='1.5.3beta05'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2786,10 +2787,10 @@ fi
 
 
 
-PNGLIB_VERSION=1.5.1beta01
+PNGLIB_VERSION=1.5.3beta05
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=1
+PNGLIB_RELEASE=3
 
 
 
@@ -2797,6 +2798,12 @@ ac_config_headers="$ac_config_headers config.h"
 
 
 # Checks for programs.
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -11809,6 +11816,46 @@ CC="$lt_save_CC"
 
 
 
+# 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:
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for a C preprocessor that does not parse its input" >&5
+$as_echo_n "checking for a C preprocessor that does not parse its input... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+1.5.0 16BIT
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  DFNCPP="$CPP"
+else
+  DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+1.5.0 16BIT
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  DFNCPP="$CPP"
+         break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+   done
+   CPP="$sav_CPP"
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+if test -n "$DFNCPP"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DFNCPP" >&5
+$as_echo "$DFNCPP" >&6; }
+
+else
+   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 1 "not found
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+
 # Checks for header files.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
@@ -12365,7 +12412,7 @@ $as_echo_n "checking if libraries can be versioned... " >&6; }
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
-*cygwin* | *mingw32* )
+*cygwin* | *mingw32* | *interix* )
     have_ld_version_script=no
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -12993,7 +13040,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.5.1beta01, which was
+This file was extended by libpng $as_me 1.5.3beta05, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -13059,7 +13106,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.5.1beta01
+libpng config.status 1.5.3beta05
 configured by $0, generated by GNU Autoconf 2.68,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -18,15 +18,15 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.5.1beta01], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.3beta05], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.5.1beta01
+PNGLIB_VERSION=1.5.3beta05
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=1
+PNGLIB_RELEASE=3
 
 dnl End of version number stuff
 
@@ -34,6 +34,7 @@ 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
@@ -44,6 +45,28 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 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
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
@@ -76,7 +99,7 @@ AC_MSG_CHECKING([if libraries can be versioned])
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
-*cygwin* | *mingw32* )
+*cygwin* | *mingw32* | *interix* )
     have_ld_version_script=no
     AC_MSG_RESULT(no)
 ;;

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.

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.

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.

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)

example.c

@@ -2,7 +2,7 @@
 #if 0 /* in case someone actually tries to compile this */
 
 /* example.c - an example of using libpng
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.3 [(PENDING RELEASE)]
  * This file has been placed in the public domain by the authors.
  * Maintained 1998-2011 Glenn Randers-Pehrson
  * Maintained 1996, 1997 Andreas Dilger)
@@ -22,6 +22,10 @@
  * see also the programs in the contrib directory.
  */
 
+#define _POSIX_SOURCE 1  /* libpng and zlib are POSIX-compliant.  You may
+                          * change this if your application uses non-POSIX
+                          * extensions. */
+
 #include "png.h"
 
  /* The png_jmpbuf() macro, used in error handling, became available in

libpngpf.3

@@ -1,912 +1,26 @@
-.TH LIBPNGPF 3 "January 8, 2011"
+.TH LIBPNGPF 3 "May 6, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.1beta01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.3beta05
 (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 \fP\fI*hi_product\fP\fB, unsigned long \fI*lo_product\fP\fB);\fP
+\fBAs of libpng version \fP\fI1.5.1\fP\fB, this section is no longer \fP\fImaintained\fP\fB, now \fIthat
 
-\fI\fB
+\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_ascii_from_fp (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIascii\fP\fB, png_size_t \fP\fIsize\fP\fB, double \fP\fIfp\fP\fB, unsigned \fIprecision\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fBint png_check_fp_number (png_charp \fP\fIstring\fP\fB, png_size_t \fP\fIsize\fP\fB, int* \fP\fIstatep\fP\fB, png_size_tp \fIwhereami\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_check_fp_string (png_charp \fP\fIstring\fP\fB, png_size_t \fIsize\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\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
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-\fI\fB
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-\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
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-\fI\fB
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-\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
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-\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
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-\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
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-\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\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
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-\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
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-\fI\fB
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-\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
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-\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\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
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-\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\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
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-\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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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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-\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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-\fBvoid png_do_write_transformations (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_far_to_near (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_fixed_error (png_structp \fP\fIpng_ptr\fP\fB, \fIpng_const_charp
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-\fBname, double \fIvalue\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBint png_gamma_significant (png_fixed_point \fIgamma\fP\fB);\fP
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-\fBpng_uint_16 png_gamma_16bit_correct (png_structp \fP\fIpng_ptr\fP\fB, unsigned \fP\fIvalue\fP\fB, png_fixed_point \fIgamma\fP\fB);\fP
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-\fBpng_byte png_gamma_8bit_correct (png_structp \fP\fIpng_ptr\fP\fB, unsigned \fP\fIvalue\fP\fB, png_fixed_point \fIgamma\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBint png_muldiv (png_fixed_point_p \fP\fIres\fP\fB, png_fixed_point \fP\fIa\fP\fB, png_int_32 \fP\fItimes\fP\fB, png_int_32 \fIdiv\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBpng_fixed_point png_muldiv_warn (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIa\fP\fB, png_int_32 \fP\fItimes\fP\fB, png_int_32 \fIdiv\fP\fB);\fP
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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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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-\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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-\fI\fB
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-\fI\fB
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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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-\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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-\fI\fB
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-\fI\fB
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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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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_process_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_push_read_chunk (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_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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-\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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-\fI\fB
-
-\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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-\fI\fB
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-\fI\fB
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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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-\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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-\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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-\fI\fB
-
-\fBvoid png_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBpng_fixed_point png_reciprocal (png_fixed_point \fIa\fP\fB);\fP
-
-\fI\fB
-
-\fBpng_fixed_point png_reciprocal2 (png_fixed_point \fP\fIa\fP\fB, png_fixed_point \fIb\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_destroy (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fI\fB
-
-\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
-
-\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
-
-\fBvoid png_fixed_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fP\fIname\fP\fB, double \fIvalue\fP\fB);\fP
+\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 pngpriv.h for more information on these functions.
+not "exported" to applications using shared libraries.
 
 .SH SEE ALSO
 .BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "January 8, 2011"
+.TH PNG 5 "May 6, 2011"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -14,7 +14,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_1beta01 Your_png_h_is_not_version_1_5_1beta01;
+typedef png_libpng_version_1_5_3beta05 Your_png_h_is_not_version_1_5_3beta05;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -137,6 +137,61 @@ png_calculate_crc(png_structp png_ptr, png_const_bytep ptr, png_size_t length)
       png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
 }
 
+/* Check a user supplied version number, called from both read and write
+ * functions that create a png_struct
+ */
+int
+png_user_version_check(png_structp png_ptr, png_const_charp user_png_ver)
+{
+   if (user_png_ver)
+   {
+      int i = 0;
+
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+   }
+
+   else
+      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+
+   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+   {
+     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+      * we must recompile any applications that use any older library version.
+      * For versions after libpng 1.0, we will be compatible, so we need
+      * only check the first digit.
+      */
+      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+      {
+#ifdef PNG_WARNINGS_SUPPORTED
+         size_t pos = 0;
+         char m[128];
+
+         pos = png_safecat(m, sizeof m, pos, "Application built with libpng-");
+         pos = png_safecat(m, sizeof m, pos, user_png_ver);
+         pos = png_safecat(m, sizeof m, pos, " but running with ");
+         pos = png_safecat(m, sizeof m, pos, png_libpng_ver);
+
+         png_warning(png_ptr, m);
+#endif
+
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+         png_ptr->flags = 0;
+#endif
+
+         return 0;
+      }
+   }
+
+   /* Success return. */
+   return 1;
+}
+
 /* Allocate the memory for an info_struct for the application.  We don't
  * really need the png_ptr, but it could potentially be useful in the
  * future.  This should be used in favour of malloc(png_sizeof(png_info))
@@ -518,28 +573,37 @@ png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime)
    if (png_ptr == NULL)
       return (NULL);
 
-   if (png_ptr->time_buffer == NULL)
    {
-      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
-         png_sizeof(char)));
+      size_t pos = 0;
+      char number_buf[5]; /* enough for a four digit year */
+
+#     define APPEND_STRING(string)\
+         pos = png_safecat(png_ptr->time_buffer, sizeof png_ptr->time_buffer,\
+            pos, (string))
+#     define APPEND_NUMBER(format, value)\
+         APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value)))
+#     define APPEND(ch)\
+         if (pos < (sizeof png_ptr->time_buffer)-1)\
+            png_ptr->time_buffer[pos++] = (ch)
+         
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->day % 32);
+      APPEND(' ');
+      APPEND_STRING(short_months[(ptime->month - 1) % 12]);
+      APPEND(' ');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year);
+      APPEND(' ');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, ptime->hour % 24);
+      APPEND(':');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, ptime->minute % 60);
+      APPEND(':');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, ptime->second % 61);
+      APPEND_STRING(" +0000"); /* This reliably terminates the buffer */
+
+#     undef APPEND
+#     undef APPEND_NUMBER
+#     undef APPEND_STRING
    }
 
-#    ifdef USE_FAR_KEYWORD
-   {
-      char near_time_buf[29];
-      png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
-          ptime->day % 32, short_months[(ptime->month - 1) % 12],
-          ptime->year, ptime->hour % 24, ptime->minute % 60,
-          ptime->second % 61);
-      png_memcpy(png_ptr->time_buffer, near_time_buf,
-          29*png_sizeof(char));
-   }
-#    else
-   png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
-       ptime->day % 32, short_months[(ptime->month - 1) % 12],
-       ptime->year, ptime->hour % 24, ptime->minute % 60,
-       ptime->second % 61);
-#    endif
    return png_ptr->time_buffer;
 }
 #  endif /* PNG_TIME_RFC1123_SUPPORTED */
@@ -547,7 +611,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime)
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
 png_const_charp PNGAPI
-png_get_copyright(png_structp png_ptr)
+png_get_copyright(png_const_structp png_ptr)
 {
    PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
 #ifdef PNG_STRING_COPYRIGHT
@@ -555,13 +619,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.5.1beta01 - January 8, 2011" PNG_STRING_NEWLINE \
+     "libpng version 1.5.3beta05 - May 6, 2011" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.5.1beta01 - January 8, 2011\
+      return "libpng version 1.5.3beta05 - May 6, 2011\
       Copyright (c) 1998-2011 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -578,14 +642,14 @@ png_get_copyright(png_structp png_ptr)
  * it is guaranteed that png.c uses the correct version of png.h.
  */
 png_const_charp PNGAPI
-png_get_libpng_ver(png_structp png_ptr)
+png_get_libpng_ver(png_const_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
    return png_get_header_ver(png_ptr);
 }
 
 png_const_charp PNGAPI
-png_get_header_ver(png_structp png_ptr)
+png_get_header_ver(png_const_structp png_ptr)
 {
    /* Version of *.h files used when building libpng */
    PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
@@ -593,7 +657,7 @@ png_get_header_ver(png_structp png_ptr)
 }
 
 png_const_charp PNGAPI
-png_get_header_version(png_structp png_ptr)
+png_get_header_version(png_const_structp png_ptr)
 {
    /* Returns longer string containing both version and date */
    PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
@@ -1031,10 +1095,10 @@ int
 png_check_fp_string(png_const_charp string, png_size_t size)
 {
    int        state=0;
-   png_size_t index=0;
+   png_size_t char_index=0;
 
-   return png_check_fp_number(string, size, &state, &index) &&
-      (index == size || string[index] == 0);
+   return png_check_fp_number(string, size, &state, &char_index) &&
+      (char_index == size || string[char_index] == 0);
 }
 #endif /* pCAL or sCAL */
 
@@ -1102,52 +1166,52 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
       if (fp < 0)
       {
          fp = -fp;
-         *ascii++ = 45; /* '-'  PLUS 1 TOTAL 1*/
+         *ascii++ = 45; /* '-'  PLUS 1 TOTAL 1 */
          --size;
       }
 
       if (fp >= DBL_MIN && fp <= DBL_MAX)
       {
-         int exp;       /* A base 10 exponent */
-         double base;   /* 10^exp */
+         int exp_b10;       /* A base 10 exponent */
+         double base;   /* 10^exp_b10 */
 
          /* First extract a base 10 exponent of the number,
           * the calculation below rounds down when converting
           * from base 2 to base 10 (multiply by log10(2) -
-          * 0.3010, but 77/256 is 0.3008, so exp needs to
+          * 0.3010, but 77/256 is 0.3008, so exp_b10 needs to
           * be increased.  Note that the arithmetic shift
           * performs a floor() unlike C arithmetic - using a
           * C multiply would break the following for negative
           * exponents.
           */
-         (void)frexp(fp, &exp); /* exponent to base 2 */
+         (void)frexp(fp, &exp_b10); /* exponent to base 2 */
 
-         exp = (exp * 77) >> 8; /* <= exponent to base 10 */
+         exp_b10 = (exp_b10 * 77) >> 8; /* <= exponent to base 10 */
 
          /* Avoid underflow here. */
-         base = png_pow10(exp); /* May underflow */
+         base = png_pow10(exp_b10); /* May underflow */
 
          while (base < DBL_MIN || base < fp)
          {
             /* And this may overflow. */
-            double test = png_pow10(exp+1);
+            double test = png_pow10(exp_b10+1);
 
             if (test <= DBL_MAX)
-               ++exp, base = test;
+               ++exp_b10, base = test;
 
             else
                break;
          }
 
-         /* Normalize fp and correct exp, after this fp is in the
-          * range [.1,1) and exp is both the exponent and the digit
+         /* Normalize fp and correct exp_b10, after this fp is in the
+          * range [.1,1) and exp_b10 is both the exponent and the digit
           * *before* which the decimal point should be inserted
           * (starting with 0 for the first digit).  Note that this
-          * works even if 10^exp is out of range because of the
+          * works even if 10^exp_b10 is out of range because of the
           * test on DBL_MAX above.
           */
          fp /= base;
-         while (fp >= 1) fp /= 10, ++exp;
+         while (fp >= 1) fp /= 10, ++exp_b10;
 
          /* Because of the code above fp may, at this point, be
           * less than .1, this is ok because the code below can
@@ -1162,10 +1226,10 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
             /* Allow up to two leading zeros - this will not lengthen
              * the number compared to using E-n.
              */
-            if (exp < 0 && exp > -3) /* PLUS 3 TOTAL 4 */
+            if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */
             {
-               czero = -exp; /* PLUS 2 digits: TOTAL 3 */
-               exp = 0;      /* Dot added below before first output. */
+               czero = -exp_b10; /* PLUS 2 digits: TOTAL 3 */
+               exp_b10 = 0;      /* Dot added below before first output. */
             }
             else
                czero = 0;    /* No zeros to add */
@@ -1207,17 +1271,17 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
                         {
                            int ch = *--ascii;
 
-                           if (exp != (-1))
-                              ++exp;
+                           if (exp_b10 != (-1))
+                              ++exp_b10;
 
                            else if (ch == 46)
                            {
                               ch = *--ascii, ++size;
-                              /* Advance exp to '1', so that the
+                              /* Advance exp_b10 to '1', so that the
                                * decimal point happens after the
                                * previous digit.
                                */
-                              exp = 1;
+                              exp_b10 = 1;
                            }
 
                            --cdigits;
@@ -1230,7 +1294,7 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
                          */
                         if (d > 9)  /* cdigits == 0 */
                         {
-                           if (exp == (-1))
+                           if (exp_b10 == (-1))
                            {
                               /* Leading decimal point (plus zeros?), if
                                * we lose the decimal point here it must
@@ -1239,14 +1303,14 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
                               int ch = *--ascii;
 
                               if (ch == 46)
-                                 ++size, exp = 1;
+                                 ++size, exp_b10 = 1;
 
-                              /* Else lost a leading zero, so 'exp' is
+                              /* Else lost a leading zero, so 'exp_b10' is
                                * still ok at (-1)
                                */
                            }
                            else
-                              ++exp;
+                              ++exp_b10;
 
                            /* In all cases we output a '1' */
                            d = 1;
@@ -1269,23 +1333,24 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
 
                   while (czero > 0)
                   {
-                     /* exp == (-1) means we just output the decimal
-                      * place - after the DP don't adjust 'exp' any
+                     /* exp_b10 == (-1) means we just output the decimal
+                      * place - after the DP don't adjust 'exp_b10' any
                       * more!
                       */
-                     if (exp != (-1))
+                     if (exp_b10 != (-1))
                      {
-                        if (exp == 0) *ascii++ = 46, --size;
+                        if (exp_b10 == 0) *ascii++ = 46, --size;
                         /* PLUS 1: TOTAL 4 */
-                        --exp;
+                        --exp_b10;
                      }
                      *ascii++ = 48, --czero;
                   }
 
-                  if (exp != (-1))
+                  if (exp_b10 != (-1))
                   {
-                     if (exp == 0) *ascii++ = 46, --size; /* counted above */
-                     --exp;
+                     if (exp_b10 == 0) *ascii++ = 46, --size; /* counted
+                                                                 above */
+                     --exp_b10;
                   }
                   *ascii++ = (char)(48 + (int)d), ++cdigits;
                }
@@ -1296,12 +1361,12 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
 
             /* Check for an exponent, if we don't need one we are
              * done and just need to terminate the string.  At
-             * this point exp==(-1) is effectively if flag - it got
+             * this point exp_b10==(-1) is effectively if flag - it got
              * to '-1' because of the decrement after outputing
              * the decimal point above (the exponent required is
              * *not* -1!)
              */
-            if (exp >= (-1) && exp <= 2)
+            if (exp_b10 >= (-1) && exp_b10 <= 2)
             {
                /* The following only happens if we didn't output the
                 * leading zeros above for negative exponent, so this
@@ -1310,7 +1375,7 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
                 * zeros were *not* output, so this doesn't increase
                 * the output count.
                 */
-               while (--exp >= 0) *ascii++ = 48;
+               while (--exp_b10 >= 0) *ascii++ = 48;
 
                *ascii = 0;
 
@@ -1328,19 +1393,19 @@ png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
              */
             size -= cdigits;
 
-            *ascii++ = 69, --size;    /* 'E': PLUS 1 TOTAL 2+precision*/
-            if (exp < 0)
+            *ascii++ = 69, --size;    /* 'E': PLUS 1 TOTAL 2+precision */
+            if (exp_b10 < 0)
             {
                *ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */
-               exp = -exp;
+               exp_b10 = -exp_b10;
             }
 
             cdigits = 0;
 
-            while (exp > 0)
+            while (exp_b10 > 0)
             {
-               exponent[cdigits++] = (char)(48 + exp % 10);
-               exp /= 10;
+               exponent[cdigits++] = (char)(48 + exp_b10 % 10);
+               exp_b10 /= 10;
             }
 
             /* Need another size check here for the exponent digits, so
@@ -1400,7 +1465,7 @@ png_ascii_from_fixed(png_structp png_ptr, png_charp ascii, png_size_t size,
 
       if (num <= 0x80000000U) /* else overflowed */
       {
-         unsigned int ndigits = 0, first = 16/*flag value*/;
+         unsigned int ndigits = 0, first = 16 /* flag value */;
          char digits[10];
 
          while (num)
@@ -1459,11 +1524,10 @@ png_fixed(png_structp png_ptr, double fp, png_const_charp text)
 {
    double r = floor(100000 * fp + .5);
 
-   if (r <= 2147483647. && r >= -2147483648.)
-      return (png_fixed_point)r;
+   if (r > 2147483647. || r < -2147483648.)
+      png_fixed_error(png_ptr, text);
 
-   png_fixed_error(png_ptr, text);
-   /*NOT REACHED*/
+   return (png_fixed_point)r;
 }
 #endif
 
@@ -1477,10 +1541,10 @@ png_fixed(png_structp png_ptr, double fp, png_const_charp text)
  */
 int
 png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
-    png_int_32 div)
+    png_int_32 divisor)
 {
-   /* Return a * times / div, rounded. */
-   if (div != 0)
+   /* Return a * times / divisor, rounded. */
+   if (divisor != 0)
    {
       if (a == 0 || times == 0)
       {
@@ -1492,7 +1556,7 @@ png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
 #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
          double r = a;
          r *= times;
-         r /= div;
+         r /= divisor;
          r = floor(r+.5);
 
          /* A png_fixed_point is a 32 bit integer. */
@@ -1516,10 +1580,10 @@ png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
          else
             T = times;
 
-         if (div < 0)
-            negative = !negative, D = -div;
+         if (divisor < 0)
+            negative = !negative, D = -divisor;
          else
-            D = div;
+            D = divisor;
 
          /* Following can't overflow because the arguments only
           * have 31 bits each, however the result may be 32 bits.
@@ -1596,11 +1660,11 @@ png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
  */
 png_fixed_point
 png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times,
-    png_int_32 div)
+    png_int_32 divisor)
 {
    png_fixed_point result;
 
-   if (png_muldiv(&result, a, times, div))
+   if (png_muldiv(&result, a, times, divisor))
       return result;
 
    png_warning(png_ptr, "fixed point overflow ignored");
@@ -1791,7 +1855,7 @@ png_8bit_l2[128] =
 static png_int_32
 png_log8bit(unsigned int x)
 {
-   unsigned int log = 0;
+   unsigned int lg2 = 0;
    /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log,
     * because the log is actually negate that means adding 1.  The final
     * returned value thus has the range 0 (for 255 input) to 7.994 (for 1
@@ -1802,16 +1866,16 @@ png_log8bit(unsigned int x)
       return 0xffffffff;
 
    if ((x & 0xf0) == 0)
-      log  = 4, x <<= 4;
+      lg2  = 4, x <<= 4;
 
    if ((x & 0xc0) == 0)
-      log += 2, x <<= 2;
+      lg2 += 2, x <<= 2;
 
    if ((x & 0x80) == 0)
-      log += 1, x <<= 1;
+      lg2 += 1, x <<= 1;
 
    /* result is at most 19 bits, so this cast is safe: */
-   return (png_int_32)((log << 16) + ((png_8bit_l2[x-128]+32768)>>16));
+   return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16));
 }
 
 /* The above gives exact (to 16 binary places) log2 values for 8 bit images,
@@ -1847,29 +1911,29 @@ png_log8bit(unsigned int x)
 static png_int_32
 png_log16bit(png_uint_32 x)
 {
-   unsigned int log = 0;
+   unsigned int lg2 = 0;
 
    /* As above, but now the input has 16 bits. */
    if ((x &= 0xffff) == 0)
       return 0xffffffff;
 
    if ((x & 0xff00) == 0)
-      log  = 8, x <<= 8;
+      lg2  = 8, x <<= 8;
 
    if ((x & 0xf000) == 0)
-      log += 4, x <<= 4;
+      lg2 += 4, x <<= 4;
 
    if ((x & 0xc000) == 0)
-      log += 2, x <<= 2;
+      lg2 += 2, x <<= 2;
 
    if ((x & 0x8000) == 0)
-      log += 1, x <<= 1;
+      lg2 += 1, x <<= 1;
 
    /* Calculate the base logarithm from the top 8 bits as a 28 bit fractional
     * value.
     */
-   log <<= 28;
-   log += (png_8bit_l2[(x>>8)-128]+8) >> 4;
+   lg2 <<= 28;
+   lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4;
 
    /* Now we need to interpolate the factor, this requires a division by the top
     * 8 bits.  Do this with maximum precision.
@@ -1880,19 +1944,19 @@ png_log16bit(png_uint_32 x)
     * the value at 1<<16 (ignoring this) will be 0 or 1; this gives us exactly
     * 16 bits to interpolate to get the low bits of the result.  Round the
     * answer.  Note that the end point values are scaled by 64 to retain overall
-    * precision and that 'log' is current scaled by an extra 12 bits, so adjust
+    * precision and that 'lg2' is current scaled by an extra 12 bits, so adjust
     * the overall scaling by 6-12.  Round at every step.
     */
    x -= 1U << 24;
 
    if (x <= 65536U) /* <= '257' */
-      log += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12);
+      lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12);
 
    else
-      log -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12);
+      lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12);
 
    /* Safe, because the result can't have more than 20 bits: */
-   return (png_int_32)((log + 2048) >> 12);
+   return (png_int_32)((lg2 + 2048) >> 12);
 }
 
 /* The 'exp()' case must invert the above, taking a 20 bit fixed point
@@ -1987,10 +2051,10 @@ png_exp(png_fixed_point x)
 }
 
 static png_byte
-png_exp8bit(png_fixed_point log)
+png_exp8bit(png_fixed_point lg2)
 {
    /* Get a 32 bit value: */
-   png_uint_32 x = png_exp(log);
+   png_uint_32 x = png_exp(lg2);
 
    /* Convert the 32 bit value to 0..255 by multiplying by 256-1, note that the
     * second, rounding, step can't overflow because of the first, subtraction,
@@ -2001,10 +2065,10 @@ png_exp8bit(png_fixed_point log)
 }
 
 static png_uint_16
-png_exp16bit(png_fixed_point log)
+png_exp16bit(png_fixed_point lg2)
 {
    /* Get a 32 bit value: */
-   png_uint_32 x = png_exp(log);
+   png_uint_32 x = png_exp(lg2);
 
    /* Convert the 32 bit value to 0..65535 by multiplying by 65536-1: */
    x -= x >> 16;
@@ -2013,18 +2077,18 @@ png_exp16bit(png_fixed_point log)
 #endif /* FLOATING_ARITHMETIC */
 
 png_byte
-png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma)
+png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val)
 {
    if (value > 0 && value < 255)
    {
 #     ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-         double r = floor(255*pow(value/255.,gamma*.00001)+.5);
+         double r = floor(255*pow(value/255.,gamma_val*.00001)+.5);
          return (png_byte)r;
 #     else
-         png_int_32 log = png_log8bit(value);
+         png_int_32 lg2 = png_log8bit(value);
          png_fixed_point res;
 
-         if (png_muldiv(&res, gamma, log, PNG_FP_1))
+         if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1))
             return png_exp8bit(res);
 
          /* Overflow. */
@@ -2036,18 +2100,18 @@ png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma)
 }
 
 png_uint_16
-png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma)
+png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val)
 {
    if (value > 0 && value < 65535)
    {
 #     ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-         double r = floor(65535*pow(value/65535.,gamma*.00001)+.5);
+         double r = floor(65535*pow(value/65535.,gamma_val*.00001)+.5);
          return (png_uint_16)r;
 #     else
-         png_int_32 log = png_log16bit(value);
+         png_int_32 lg2 = png_log16bit(value);
          png_fixed_point res;
 
-         if (png_muldiv(&res, gamma, log, PNG_FP_1))
+         if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1))
             return png_exp16bit(res);
 
          /* Overflow. */
@@ -2065,23 +2129,23 @@ png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma)
  */
 png_uint_16 /* PRIVATE */
 png_gamma_correct(png_structp png_ptr, unsigned int value,
-    png_fixed_point gamma)
+    png_fixed_point gamma_val)
 {
    if (png_ptr->bit_depth == 8)
-      return png_gamma_8bit_correct(value, gamma);
+      return png_gamma_8bit_correct(value, gamma_val);
 
    else
-      return png_gamma_16bit_correct(value, gamma);
+      return png_gamma_16bit_correct(value, gamma_val);
 }
 
 /* This is the shared test on whether a gamma value is 'significant' - whether
  * it is worth doing gamma correction.
  */
 int /* PRIVATE */
-png_gamma_significant(png_fixed_point gamma)
+png_gamma_significant(png_fixed_point gamma_val)
 {
-   return gamma < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED ||
-       gamma > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED;
+   return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED ||
+       gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED;
 }
 
 /* Internal function to build a single 16 bit table - the table consists of
@@ -2094,7 +2158,7 @@ png_gamma_significant(png_fixed_point gamma)
  */
 static void
 png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable,
-   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma)
+   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
 {
    /* Various values derived from 'shift': */
    PNG_CONST unsigned int num = 1U << (8U - shift);
@@ -2113,7 +2177,7 @@ png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable,
       /* The 'threshold' test is repeated here because it can arise for one of
        * the 16 bit tables even if the others don't hit it.
        */
-      if (png_gamma_significant(gamma))
+      if (png_gamma_significant(gamma_val))
       {
          /* The old code would overflow at the end and this would cause the
           * 'pow' function to return a result >1, resulting in an
@@ -2129,13 +2193,13 @@ png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable,
             png_uint_32 ig = (j << (8-shift)) + i;
 #           ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
                /* Inline the 'max' scaling operation: */
-               double d = floor(65535*pow(ig/(double)max, gamma*.00001)+.5);
+               double d = floor(65535*pow(ig/(double)max, gamma_val*.00001)+.5);
                sub_table[j] = (png_uint_16)d;
 #           else
                if (shift)
                   ig = (ig * 65535U + max_by_2)/max;
 
-               sub_table[j] = png_gamma_16bit_correct(ig, gamma);
+               sub_table[j] = png_gamma_16bit_correct(ig, gamma_val);
 #           endif
          }
       }
@@ -2162,7 +2226,7 @@ png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable,
  */
 static void
 png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable,
-   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma)
+   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
 {
    PNG_CONST unsigned int num = 1U << (8U - shift);
    PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
@@ -2180,7 +2244,7 @@ png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable,
       table[i] = (png_uint_16p)png_malloc(png_ptr,
           256 * png_sizeof(png_uint_16));
 
-   /* 'gamma' is set to the reciprocal of the value calculated above, so
+   /* 'gamma_val' is set to the reciprocal of the value calculated above, so
     * pow(out,g) is an *input* value.  'last' is the last input value set.
     *
     * In the loop 'i' is used to find output values.  Since the output is 8
@@ -2203,7 +2267,7 @@ png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable,
       png_uint_16 out = (png_uint_16)(i * 257U); /* 16 bit output value */
 
       /* Find the boundary value in 16 bits: */
-      png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma);
+      png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val);
 
       /* Adjust (round) to (16-shift) bits: */
       bound = (bound * max + 32768U)/65535U + 1U;
@@ -2229,13 +2293,13 @@ png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable,
  */
 static void
 png_build_8bit_table(png_structp png_ptr, png_bytepp ptable,
-   PNG_CONST png_fixed_point gamma)
+   PNG_CONST png_fixed_point gamma_val)
 {
    unsigned int i;
    png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256);
 
-   if (png_gamma_significant(gamma)) for (i=0; i<256; i++)
-      table[i] = png_gamma_8bit_correct(i, gamma);
+   if (png_gamma_significant(gamma_val)) for (i=0; i<256; i++)
+      table[i] = png_gamma_8bit_correct(i, gamma_val);
 
    else for (i=0; i<256; ++i)
       table[i] = (png_byte)i;

pngconf.h

@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.1beta01 - (PENDING RELEASE)
+ * libpng version 1.5.3beta05 - May 6, 2011 
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -22,29 +22,31 @@
 #ifndef PNGCONF_H
 #define PNGCONF_H
 
+#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>
-#endif
+#  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
+#  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>
+#  ifdef PNG_STDIO_SUPPORTED
+#    include <stdio.h>
+#  endif
 #endif
 
 /* This controls optimization of the reading of 16 and 32 bit values
@@ -282,23 +284,15 @@
 #  endif
 #endif
 
-/* THe following complexity is concerned with getting the 'attributes' of the
- * declared function in the correct place.  This potentially requires a separate
- * PNG_EXPORT function for every compiler.
+/* 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
-#  ifdef __GNUC__
-#     define PNG_FUNCTION(type, name, args, attributes)\
-         attributes type name args
-#  else /* !GNUC */
-#     ifdef _MSC_VER
-#        define PNG_FUNCTION(type, name, args, attributes)\
-         attributes type name args
-#     else /* !MSC */
-#        define PNG_FUNCTION(type, name, args, attributes)\
-            type name args
-#     endif
-#  endif
+#  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
 #endif
 
 #ifndef PNG_EXPORT_TYPE
@@ -310,13 +304,19 @@
     * scripts directory.
     */
 #ifndef PNG_EXPORTA
+
 #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-      extern PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(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_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
 
 /* Use PNG_REMOVED to comment out a removed interface. */
 #ifndef PNG_REMOVED
@@ -324,8 +324,7 @@
 #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
@@ -347,16 +346,13 @@
    * 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
-#      define PNG_PTR_NORETURN   __attribute__((__noreturn__))
-#    endif
 #    ifndef PNG_ALLOCATED
 #      define PNG_ALLOCATED  __attribute__((__malloc__))
 #    endif
@@ -369,9 +365,6 @@
 #      ifndef PNG_DEPRECATED
 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 #      endif
-#      ifndef PNG_DEPSTRUCT
-#        define PNG_DEPSTRUCT  __attribute__((__deprecated__))
-#      endif
 #      ifndef PNG_PRIVATE
 #        if 0 /* Doesn't work so we use deprecated instead*/
 #          define PNG_PRIVATE \
@@ -380,19 +373,17 @@
 #          define PNG_PRIVATE \
             __attribute__((__deprecated__))
 #        endif
-#      endif /* PNG_PRIVATE */
+#      endif
 #    endif /* PNGLIB_BUILD */
 #  endif /* __GNUC__ */
-#  ifdef _MSC_VER /* may need to check value */
+
+#  if defined(_MSC_VER)  && (_MSC_VER >= 1300)
 #    ifndef PNG_USE_RESULT
-#      define PNG_USE_RESULT /*not supported*/
+#      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
@@ -405,14 +396,11 @@
 #      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 /* PNG_PRIVATE */
+#      endif
 #    endif /* PNGLIB_BUILD */
-#  endif /* __GNUC__ */
+#  endif /* _MSC_VER */
 #endif /* PNG_PEDANTIC_WARNINGS */
 
 #ifndef PNG_DEPRECATED
@@ -427,9 +415,6 @@
 #ifndef PNG_ALLOCATED
 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 #endif
-#ifndef PNG_DEPSTRUCT
-#  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
-#endif
 #ifndef PNG_PRIVATE
 #  define PNG_PRIVATE     /* This is a private libpng function */
 #endif

pngerror.c

@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -89,15 +89,120 @@ png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN)
 PNG_FUNCTION(void,PNGAPI
 png_err,(png_structp png_ptr),PNG_NORETURN)
 {
+   /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed erroneouly
+    * as '\0'.  This was apparently an error, and png_default_error will crash
+    * in this case.
+    */
    if (png_ptr != NULL && png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_ptr, '\0');
+      (*(png_ptr->error_fn))(png_ptr, "");
 
    /* If the custom handler doesn't exist, or if it returns,
       use the default handler, which will not return. */
-   png_default_error(png_ptr, '\0');
+   png_default_error(png_ptr, "");
 }
 #endif /* PNG_ERROR_TEXT_SUPPORTED */
 
+/* Utility to safely appends strings to a buffer.  This never errors out so
+ * error checking is not required in the caller.
+ */
+size_t
+png_safecat(png_charp buffer, size_t bufsize, size_t pos,
+   png_const_charp string)
+{
+   if (buffer != NULL && pos < bufsize)
+   {
+      if (string != NULL)
+         while (*string != '\0' && pos < bufsize-1)
+           buffer[pos++] = *string++;
+
+      buffer[pos] = '\0';
+   }
+
+   return pos;
+}
+
+#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
+/* Utility to dump an unsigned value into a buffer, given a start pointer and
+ * and end pointer (which should point just *beyond* the end of the buffer!)
+ * Returns the pointer to the start of the formatted string.
+ */
+png_charp
+png_format_number(png_const_charp start, png_charp end, int format,
+   png_alloc_size_t number)
+{
+   int count = 0;    /* number of digits output */
+   int mincount = 1; /* minimum number required */
+   int output = 0;   /* digit output (for the fixed point format) */
+
+   *--end = '\0';
+
+   /* This is written so that the loop always runs at least once, even with
+    * number zero.
+    */
+   while (end > start && (number != 0 || count < mincount))
+   {
+
+      static const char digits[] = "0123456789ABCDEF";
+
+      switch (format)
+      {
+         case PNG_NUMBER_FORMAT_fixed:
+            /* Needs five digits (the fraction) */
+            mincount = 5;
+            if (output || number % 10 != 0)
+            {
+               *--end = digits[number % 10];
+               output = 1;
+            }
+            number /= 10;
+            break;
+
+         case PNG_NUMBER_FORMAT_02u:
+            /* Expects at least 2 digits. */
+            mincount = 2;
+            /* fall through */
+
+         case PNG_NUMBER_FORMAT_u:
+            *--end = digits[number % 10];
+            number /= 10;
+            break;
+
+         case PNG_NUMBER_FORMAT_02x:
+            /* This format expects at least two digits */
+            mincount = 2;
+            /* fall through */
+
+         case PNG_NUMBER_FORMAT_x:
+            *--end = digits[number & 0xf];
+            number >>= 4;
+            break;
+
+         default: /* an error */
+            number = 0;
+            break;
+      }
+
+      /* Keep track of the number of digits added */
+      ++count;
+
+      /* Float a fixed number here: */
+      if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start)
+      {
+         /* End of the fraction, but maybe nothing was output?  In that case
+          * drop the decimal point.  If the number is a true zero handle that
+          * here.
+          */
+         if (output)
+            *--end = '.';
+         else if (number == 0) /* and !output */
+            *--end = '0';
+      }
+   }
+
+   return end;
+}
+#endif
+
 #ifdef PNG_WARNINGS_SUPPORTED
 /* This function is called whenever there is a non-fatal error.  This function
  * should not be changed.  If there is a need to handle warnings differently,
@@ -128,6 +233,115 @@ png_warning(png_structp png_ptr, png_const_charp warning_message)
    else
       png_default_warning(png_ptr, warning_message + offset);
 }
+
+/* These functions support 'formatted' warning messages with up to
+ * PNG_WARNING_PARAMETER_COUNT parameters.  In the format string the parameter
+ * is introduced by @<number>, where 'number' starts at 1.  This follows the
+ * standard established by X/Open for internationalizable error messages.
+ */
+void
+png_warning_parameter(png_warning_parameters p, int number,
+   png_const_charp string)
+{
+   if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
+      (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
+}
+
+void
+png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
+   png_alloc_size_t value)
+{
+   char buffer[PNG_NUMBER_BUFFER_SIZE];
+   png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
+}
+
+void
+png_warning_parameter_signed(png_warning_parameters p, int number, int format,
+   png_int_32 value)
+{
+   png_alloc_size_t u;
+   png_charp str;
+   char buffer[PNG_NUMBER_BUFFER_SIZE];
+
+   /* Avoid overflow by doing the negate in a png_alloc_size_t: */
+   u = (png_alloc_size_t)value;
+   if (value < 0)
+      u = ~u + 1;
+
+   str = PNG_FORMAT_NUMBER(buffer, format, u);
+
+   if (value < 0 && str > buffer)
+      *--str = '-';
+
+   png_warning_parameter(p, number, str);
+}
+
+void
+png_formatted_warning(png_structp png_ptr, png_warning_parameters p,
+   png_const_charp message)
+{
+   /* The internal buffer is just 128 bytes - enough for all our messages,
+    * overflow doesn't happen because this code checks!
+    */
+   size_t i;
+   char msg[128];
+
+   for (i=0; i<(sizeof msg)-1 && *message != '\0'; ++i)
+   {
+      if (*message == '@')
+      {
+         int parameter = -1;
+         switch (*++message)
+         {
+            case '1':
+               parameter = 0;
+               break;
+
+            case '2':
+               parameter = 1;
+               break;
+
+            case '\0':
+               continue; /* To break out of the for loop above. */
+
+            default:
+               break;
+         }
+
+         if (parameter >= 0 && parameter < PNG_WARNING_PARAMETER_COUNT)
+         {
+            /* Append this parameter */
+            png_const_charp parm = p[parameter];
+            png_const_charp pend = p[parameter] + (sizeof p[parameter]);
+
+            /* No need to copy the trailing '\0' here, but there is no guarantee
+             * that parm[] has been initialized, so there is no guarantee of a
+             * trailing '\0':
+             */
+            for (; i<(sizeof msg)-1 && parm != '\0' && parm < pend; ++i)
+               msg[i] = *parm++;
+
+            ++message;
+            continue;
+         }
+
+         /* else not a parameter and there is a character after the @ sign; just
+          * copy that.
+          */
+      }
+
+      /* At this point *message can't be '\0', even in the bad parameter case
+       * above where there is a lone '@' at the end of the message string.
+       */
+      msg[i] = *message++;
+   }
+
+   /* i is always less than (sizeof msg), so: */
+   msg[i] = '\0';
+
+   /* And this is the formatted message: */
+   png_warning(png_ptr, msg);
+}
 #endif /* PNG_WARNINGS_SUPPORTED */
 
 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
@@ -272,7 +486,7 @@ png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn,
       return NULL;
 
    png_ptr->longjmp_fn = longjmp_fn;
-   return &png_ptr->png_jmpbuf;
+   return &png_ptr->longjmp_buffer;
 }
 #endif
 
@@ -287,7 +501,8 @@ png_default_error,(png_structp png_ptr, png_const_charp error_message),
 {
 #ifdef PNG_CONSOLE_IO_SUPPORTED
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (*error_message == PNG_LITERAL_SHARP)
+   /* Check on NULL only added in 1.5.3 */
+   if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
    {
       /* Strip "#nnnn " from beginning of error message. */
       int offset;
@@ -317,11 +532,11 @@ png_default_error,(png_structp png_ptr, png_const_charp error_message),
    else
 #endif
    {
-      fprintf(stderr, "libpng error: %s", error_message);
+      fprintf(stderr, "libpng error: %s", error_message ? error_message :
+         "undefined");
       fprintf(stderr, PNG_STRING_NEWLINE);
    }
-#endif
-#ifndef PNG_CONSOLE_IO_SUPPORTED
+#else
    PNG_UNUSED(error_message) /* Make compiler happy */
 #endif
    png_longjmp(png_ptr, 1);
@@ -335,13 +550,13 @@ png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN)
    {
 #  ifdef USE_FAR_KEYWORD
       {
-         jmp_buf png_jmpbuf;
-         png_memcpy(png_jmpbuf, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
-         png_ptr->longjmp_fn(png_jmpbuf, val);
+         jmp_buf tmp_jmpbuf;
+         png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
+         png_ptr->longjmp_fn(tmp_jmpbuf, val);
       }
 
 #  else
-   png_ptr->longjmp_fn(png_ptr->png_jmpbuf, val);
+   png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val);
 #  endif
    }
 #endif
@@ -403,7 +618,7 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
 /* This function is called when the application wants to use another method
  * of handling errors and warnings.  Note that the error function MUST NOT
  * return to the calling routine or serious problems will occur.  The return
- * method used in the default routine calls longjmp(png_ptr->png_jmpbuf, 1)
+ * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1)
  */
 void PNGAPI
 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
@@ -414,7 +629,11 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 
    png_ptr->error_ptr = error_ptr;
    png_ptr->error_fn = error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    png_ptr->warning_fn = warning_fn;
+#else
+   PNG_UNUSED(warning_fn)
+#endif
 }
 
 
@@ -423,7 +642,7 @@ 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;

pngget.c

@@ -1,7 +1,7 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -17,7 +17,8 @@
 #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);
@@ -26,7 +27,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 }
 
 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);
@@ -36,7 +37,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 
 #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);
@@ -48,7 +49,7 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr)
 #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;
@@ -57,7 +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;
@@ -66,7 +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;
@@ -75,7 +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;
@@ -84,7 +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;
@@ -93,7 +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;
@@ -102,7 +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;
@@ -111,7 +112,7 @@ 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)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -128,7 +129,7 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 }
 
 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)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -145,7 +146,7 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 }
 
 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)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -163,7 +164,7 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 
 #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)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -182,7 +183,8 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
 
 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
-png_get_pixel_aspect_ratio_fixed(png_structp png_ptr, png_infop info_ptr)
+png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,
+    png_const_infop info_ptr)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
@@ -208,7 +210,7 @@ png_get_pixel_aspect_ratio_fixed(png_structp png_ptr, png_infop info_ptr)
 #endif
 
 png_int_32 PNGAPI
-png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
+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))
@@ -224,7 +226,7 @@ png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 }
 
 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)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -240,7 +242,7 @@ png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 }
 
 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)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -256,7 +258,7 @@ png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 }
 
 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)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -305,19 +307,19 @@ ppi_from_ppm(png_uint_32 ppm)
 }
 
 png_uint_32 PNGAPI
-png_get_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 ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 }
 
 png_uint_32 PNGAPI
-png_get_x_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 ppi_from_ppm(png_get_x_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_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));
 }
@@ -335,7 +337,8 @@ png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns)
 }
 
 png_fixed_point PNGAPI
-png_get_x_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
+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));
@@ -344,7 +347,8 @@ png_get_x_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
 
 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
-png_get_y_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
+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));
@@ -353,7 +357,7 @@ png_get_y_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
 
 #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)
 {
    /* To avoid the overflow do the conversion directly in floating
     * point.
@@ -364,7 +368,7 @@ png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
 
 #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)
 {
    /* To avoid the overflow do the conversion directly in floating
     * point.
@@ -375,7 +379,7 @@ png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
 
 #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;
@@ -419,7 +423,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
 #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);
@@ -428,7 +432,7 @@ png_get_channels(png_structp png_ptr, png_infop info_ptr)
 }
 
 png_const_bytep PNGAPI
-png_get_signature(png_structp png_ptr, png_infop info_ptr)
+png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->signature);
@@ -438,7 +442,7 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)
 
 #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)
@@ -457,7 +461,7 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_cHRM_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)
 {
@@ -490,7 +494,7 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
 
 #  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)
@@ -525,7 +529,7 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 
 #ifdef PNG_gAMA_SUPPORTED
 png_uint_32 PNGFAPI
-png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+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");
@@ -541,7 +545,8 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
 }
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
+png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
+    double *file_gamma)
 {
    png_fixed_point igamma;
    png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);
@@ -557,7 +562,8 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
 
 #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");
 
@@ -574,7 +580,7 @@ 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_bytepp profile, png_uint_32 *proflen)
 {
@@ -599,7 +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)
@@ -614,7 +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");
 
@@ -670,7 +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");
@@ -690,7 +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)
 {
@@ -718,7 +725,7 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 #  ifdef PNG_FIXED_POINT_SUPPORTED
 #    ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sCAL_fixed(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 &&
@@ -738,7 +745,7 @@ png_get_sCAL_fixed(png_structp png_ptr, png_infop info_ptr,
 #  endif /* FIXED_POINT */
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+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 &&
@@ -754,7 +761,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #  endif /* FLOATING POINT */
 png_uint_32 PNGAPI
-png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+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 &&
@@ -772,7 +779,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 
 #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;
@@ -806,8 +813,8 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 #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");
 
@@ -825,7 +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");
 
@@ -842,8 +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)
    {
@@ -869,7 +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");
 
@@ -886,7 +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;
@@ -931,7 +939,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
 
 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
 int PNGAPI
-png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+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)
@@ -946,7 +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);
 }
@@ -954,14 +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);
 }
@@ -971,27 +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);
 }
@@ -1005,6 +1013,15 @@ png_get_io_state (png_structp png_ptr)
    return png_ptr->io_state;
 }
 
+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)
 {

pngmem.c

@@ -1,7 +1,7 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -187,8 +187,9 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
             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)
             {
@@ -196,14 +197,22 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
                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++;
@@ -277,7 +286,7 @@ png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
       {
 #  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");
@@ -647,7 +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);

pngpread.c

@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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...
  */
@@ -582,10 +640,10 @@ png_push_crc_finish(png_structp png_ptr)
 {
    if (png_ptr->skip_length && png_ptr->save_buffer_size)
    {
-      png_size_t save_size = png_ptr->current_buffer_size;
+      png_size_t save_size = png_ptr->save_buffer_size;
       png_uint_32 skip_length = png_ptr->skip_length;
 
-      /* We want the smaller of 'skip_length' and 'current_buffer_size', but
+      /* 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
@@ -609,10 +667,8 @@ png_push_crc_finish(png_structp png_ptr)
       png_size_t save_size = png_ptr->current_buffer_size;
       png_uint_32 skip_length = png_ptr->skip_length;
 
-      /* We want the smaller of 'skip_length' 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.
+      /* 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;
@@ -970,8 +1026,10 @@ 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))
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
+   if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
+#endif
 
 #ifdef PNG_READ_INTERLACING_SUPPORTED
    /* Blow up interlaced rows to full size */
@@ -1232,7 +1290,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
       {
          PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
          png_error(png_ptr, "Out of place tEXt");
-         /*NOT REACHED*/
+         /* NOT REACHED */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1329,7 +1387,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    {
       PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
       png_error(png_ptr, "Out of place zTXt");
-      /*NOT REACHED*/
+      /* NOT REACHED */
    }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1533,7 +1591,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    {
       PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */
       png_error(png_ptr, "Out of place iTXt");
-      /*NOT REACHED*/
+      /* NOT REACHED */
    }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1788,7 +1846,7 @@ 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);

pngpriv.h

@@ -6,7 +6,7 @@
  * (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 1.5.0 [January 6, 2011]
+ * 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
@@ -25,6 +25,20 @@
 #ifndef PNGPRIV_H
 #define PNGPRIV_H
 
+/* Feature Test Macros.  The following are defined here to ensure that correctly
+ * implemented libraries reveal the APIs libpng needs to build and hide those
+ * that are not needed and potentially damaging to the compilation.
+ *
+ * Feature Test Macros must be defined before any system header is included (see
+ * POSIX 1003.1 2.8.2 "POSIX Symbols."
+ *
+ * These macros only have an effect if the operating system supports either
+ * POSIX 1003.1 or C99, or both.  On other operating systems (particularly
+ * Windows/Visual Studio) there is no effect; the OS specific tests below are
+ * still required (as of 2011-05-02.)
+ */
+#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
+
 /* This is required for the definition of abort(), used as a last ditch
  * error handler when all else fails.
  */
@@ -83,13 +97,14 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 #  define PNG_MAX_MALLOC_64K
 #endif
 
-/* Unused formal parameter errors are removed using the following macro
- * which is expected to have no bad effects on performance.  Note that
- * if you replace it with something other than whitespace, you must include
- * the terminating semicolon.
- */
 #ifndef PNG_UNUSED
-#  define PNG_UNUSED(param) param = param;
+/* 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.
+ */
+#  define PNG_UNUSED(param) (void)param;
 #endif
 
 /* Just a little check that someone hasn't tried to define something
@@ -100,12 +115,20 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 #  define PNG_ZBUF_SIZE 65536L
 #endif
 
-/* If warnings or errors are turned off the code is disabled
- * or redirected here.
+/* If warnings or errors are turned off the code is disabled or redirected here.
+ * From 1.5.3 functions have been added to allow very limited formatting of
+ * error and warning messages - this code will also be disabled here.
  */
-#ifndef PNG_WARNINGS_SUPPORTED
-#  define png_warning(s1,s2) ((void)0)
-#  define png_chunk_warning(s1,s2) ((void)0)
+#ifdef PNG_WARNINGS_SUPPORTED
+#  define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
+#else
+#  define png_warning(s1,s2) ((void)(s1))
+#  define png_chunk_warning(s1,s2) ((void)(s1))
+#  define png_warning_parameter(p,number,string) ((void)0)
+#  define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
+#  define png_warning_parameter_signed(p,number,format,value) ((void)0)
+#  define png_formatted_warning(pp,p,message) ((void)(pp))
+#  define PNG_WARNING_PARAMETERS(p) 
 #endif
 #ifndef PNG_ERROR_TEXT_SUPPORTED
 #  define png_error(s1,s2) png_err(s1)
@@ -141,7 +164,7 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
     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)
@@ -230,29 +253,6 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 #  endif
 #endif
 /* End of memory model/platform independent support */
-
-#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
@@ -287,7 +287,7 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 #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
@@ -341,16 +341,16 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 #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)
@@ -471,6 +471,12 @@ extern "C" {
  * be found in the files where the functions are located.
  */
 
+/* Check the user version string for compatibility, returns false if the version
+ * numbers aren't compatible.
+ */
+PNG_EXTERN int png_user_version_check(png_structp png_ptr,
+   png_const_charp user_png_ver);
+
 /* Allocate memory for an internal libpng struct */
 PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),
    PNG_ALLOCATED);
@@ -539,8 +545,7 @@ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
     png_size_t length));
 
 /* Decompress data in a chunk that uses compression */
-#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
-    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
+#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED)
 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
     int comp_type, png_size_t chunklength, png_size_t prefix_length,
     png_size_t *data_length));
@@ -643,6 +648,7 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,
     png_const_uint_16p hist, int num_hist));
 #endif
 
+/* Chunks that have keywords */
 #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,
@@ -733,17 +739,17 @@ PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
     png_row_infop row_info));
 
-/* Write out the filtered row. */
-PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
-    png_bytep filtered_row));
 /* Finish a row while reading, dealing with interlacing passes, etc. */
 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
 
 /* Initialize the row buffers, etc. */
 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
+
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
 /* Optional call to update the users info structure */
 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
     png_infop info_ptr));
+#endif
 
 /* These are the functions that do the transformations */
 #ifdef PNG_READ_FILLER_SUPPORTED
@@ -773,8 +779,8 @@ 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
@@ -847,25 +853,13 @@ PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,
 #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_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_const_color_16p trans_color,
-    png_const_color_16p background));
-#  endif
+    png_bytep row, png_structp png_ptr));
 #endif
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
 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));
+    png_bytep row, png_structp png_ptr));
 #endif
 
 #ifdef PNG_READ_EXPAND_SUPPORTED
@@ -876,6 +870,11 @@ PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
     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,
  * then calls the appropriate callback for the chunk if it is valid.
  */
@@ -980,10 +979,16 @@ PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
     png_const_bytep chunk_name));
 
 /* Handle the transformations for reading and writing */
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
+#endif
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
+#endif
 
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
+#endif
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
@@ -1080,6 +1085,76 @@ PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,
    png_const_charp name),PNG_NORETURN);
 #endif
 
+/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
+ * the end.  Always leaves the buffer nul terminated.  Never errors out (and
+ * there is no error code.)
+ */
+PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos,
+    png_const_charp string);
+
+/* Various internal functions to handle formatted warning messages, currently
+ * only implemented for warnings.
+ */
+#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
+/* Utility to dump an unsigned value into a buffer, given a start pointer and
+ * and end pointer (which should point just *beyond* the end of the buffer!)
+ * Returns the pointer to the start of the formatted string.  This utility only
+ * does unsigned values.
+ */
+PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end,
+   int format, png_alloc_size_t number);
+
+/* Convenience macro that takes an array: */
+#define PNG_FORMAT_NUMBER(buffer,format,number) \
+   png_format_number(buffer, buffer + (sizeof buffer), format, number)
+
+/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
+#define PNG_NUMBER_BUFFER_SIZE 24
+
+/* These are the integer formats currently supported, the name is formed from
+ * the standard printf(3) format string.
+ */
+#define PNG_NUMBER_FORMAT_u     1 /* chose unsigned API! */
+#define PNG_NUMBER_FORMAT_02u   2
+#define PNG_NUMBER_FORMAT_d     1 /* chose signed API! */
+#define PNG_NUMBER_FORMAT_02d   2
+#define PNG_NUMBER_FORMAT_x     3
+#define PNG_NUMBER_FORMAT_02x   4
+#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
+#endif
+
+#ifdef PNG_WARNINGS_SUPPORTED
+/* New defines and members adding in libpng-1.5.3 */
+#  define PNG_WARNING_PARAMETER_SIZE 32
+#  define PNG_WARNING_PARAMETER_COUNT 8
+
+/* An l-value of this type has to be passed to the APIs below to cache the
+ * values of the parameters to a formatted warning message.
+ */
+typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
+   PNG_WARNING_PARAMETER_SIZE];
+
+PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number,
+    png_const_charp string);
+    /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
+     * including the trailing '\0'.
+     */
+PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p,
+    int number, int format, png_alloc_size_t value);
+    /* Use png_alloc_size_t because it is an unsigned type as big as any we
+     * need to output.  Use the following for a signed value.
+     */
+PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p,
+    int number, int format, png_int_32 value);
+
+PNG_EXTERN void png_formatted_warning(png_structp png_ptr,
+    png_warning_parameters p, png_const_charp message);
+    /* 'message' follows the X/Open approach of using @1, @2 to insert
+     * parameters previously supplied using the above functions.  Errors in
+     * specifying the paramters will simple result in garbage substitutions.
+     */
+#endif
+
 /* ASCII to FP interfaces, currently only implemented if sCAL
  * support is required.
  */
@@ -1185,13 +1260,13 @@ PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,
  * holds the result.
  */
 PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
-    png_int_32 times, png_int_32 div));
+    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 times, png_int_32 div));
+    png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by));
 #endif
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
@@ -1218,12 +1293,12 @@ PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
  * 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));
-PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma));
+    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));
+    png_fixed_point gamma_value));
 PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
-    png_fixed_point gamma));
+    png_fixed_point gamma_value));
 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
     int bit_depth));
 #endif

pngread.c

@@ -1,7 +1,7 @@
 
 /* pngread.c - read a PNG file
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -47,12 +47,10 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
 
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
-   jmp_buf png_jmpbuf;
+   jmp_buf tmp_jmpbuf;
 #endif
 #endif
 
-   int i;
-
    png_debug(1, "in png_create_read_struct");
 
 #ifdef PNG_USER_MEM_SUPPORTED
@@ -85,13 +83,13 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
    encounter a png_error() will longjmp here.  Since the jmpbuf is
    then meaningless we abort instead of returning. */
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(png_jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */
 #endif
       PNG_ABORT();
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 #endif /* PNG_SETJMP_SUPPORTED */
 
@@ -101,54 +99,9 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
 
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
-   if (user_png_ver)
-   {
-      i = 0;
-
-      do
-      {
-         if (user_png_ver[i] != png_libpng_ver[i])
-            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-      } while (png_libpng_ver[i++]);
-   }
-
-   else
-      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-
-
-   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
-   {
-     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
-      * we must recompile any applications that use any older library version.
-      * For versions after libpng 1.0, we will be compatible, so we need
-      * only check the first digit.
-      */
-      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
-          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
-          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
-      {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-         char msg[80];
-         if (user_png_ver)
-         {
-            png_snprintf2(msg, 80,
-                "Application built with libpng-%.20s"
-                " but running with %.20s",
-                user_png_ver,
-                png_libpng_ver);
-            png_warning(png_ptr, msg);
-         }
-#else
-         png_warning(png_ptr,
-             "Incompatible libpng version in application and library");
-#endif
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-         png_ptr->flags = 0;
-#endif
-
-         png_cleanup_needed = 1;
-      }
-   }
+   /* Call the general version checker (shared with read and write code): */
+   if (!png_user_version_check(png_ptr, user_png_ver))
+      png_cleanup_needed = 1;
 
    if (!png_cleanup_needed)
    {
@@ -457,7 +410,11 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
           "Ignoring extra png_read_update_info() call;"
           " row buffer not reallocated");
 
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
    png_read_transform_info(png_ptr, info_ptr);
+#else
+   PNG_UNUSED(info_ptr)
+#endif
 }
 
 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
@@ -488,9 +445,11 @@ 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)
@@ -702,8 +661,10 @@ 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))
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
+   if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
+#endif
 
 #ifdef PNG_READ_INTERLACING_SUPPORTED
    /* Blow up interlaced rows to full size */
@@ -841,7 +802,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
    }
    else
    {
-      if (!(png_ptr->transformations & PNG_INTERLACE))
+      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,
@@ -1161,7 +1122,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
    jmp_buf tmp_jmp;
 #endif
    png_error_ptr error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    png_error_ptr warning_fn;
+#endif
    png_voidp error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_free_ptr free_fn;
@@ -1247,10 +1210,6 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
 #endif
 #endif
 
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-   png_free(png_ptr, png_ptr->time_buffer);
-#endif
-
    inflateEnd(&png_ptr->zstream);
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -1267,11 +1226,13 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
     * being used again.
     */
 #ifdef PNG_SETJMP_SUPPORTED
-   png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
 #endif
 
    error_fn = png_ptr->error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    warning_fn = png_ptr->warning_fn;
+#endif
    error_ptr = png_ptr->error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    free_fn = png_ptr->free_fn;
@@ -1280,14 +1241,16 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
    png_memset(png_ptr, 0, png_sizeof(png_struct));
 
    png_ptr->error_fn = error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    png_ptr->warning_fn = warning_fn;
+#endif
    png_ptr->error_ptr = error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr->free_fn = free_fn;
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+   png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf));
 #endif
 
 }
@@ -1311,7 +1274,7 @@ 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
@@ -1426,6 +1389,11 @@ 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).

pngrtran.c

@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.5.1 [(PENDING RELEASE)]
+ * 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.)
@@ -149,7 +149,7 @@ png_set_strip_alpha(png_structp png_ptr)
    if (png_ptr == NULL)
       return;
 
-   png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
+   png_ptr->transformations |= PNG_STRIP_ALPHA;
 }
 #endif
 
@@ -686,14 +686,36 @@ png_set_tRNS_to_alpha(png_structp png_ptr)
 }
 #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
 
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+/* Expand to 16 bit channels, expand the tRNS chunk too (because otherwise
+ * it may not work correctly.)
+ */
+void PNGAPI
+png_set_expand_16(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_expand_16");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+#endif
+
 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
 void PNGAPI
 png_set_gray_to_rgb(png_structp png_ptr)
 {
    png_debug(1, "in png_set_gray_to_rgb");
 
-   png_ptr->transformations |= PNG_GRAY_TO_RGB;
-   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+   if (png_ptr != NULL)
+   {
+      /* Because rgb must be 8 bits or more: */
+      png_set_expand_gray_1_2_4_to_8(png_ptr);
+      png_ptr->transformations |= PNG_GRAY_TO_RGB;
+      png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+   }
 }
 #endif
 
@@ -802,6 +824,7 @@ png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
 }
 #endif
 
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
 /* Initialize everything needed for the read.  This includes modifying
  * the palette.
  */
@@ -1068,7 +1091,7 @@ png_init_read_transformations(png_structp png_ptr)
              */
             png_ptr->transformations &= ~PNG_BACKGROUND;
             png_ptr->transformations &= ~PNG_GAMMA;
-            png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
+            png_ptr->transformations |= PNG_STRIP_ALPHA;
          }
 
          /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
@@ -1202,7 +1225,7 @@ png_init_read_transformations(png_structp png_ptr)
 
       /* Handled alpha, still need to strip the channel. */
       png_ptr->transformations &= ~PNG_BACKGROUND;
-      png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
+      png_ptr->transformations |= PNG_STRIP_ALPHA;
    }
 #endif /* PNG_READ_BACKGROUND_SUPPORTED */
 
@@ -1280,6 +1303,14 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
    }
 #endif
 
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+   if (png_ptr->transformations & PNG_EXPAND_16 && info_ptr->bit_depth == 8 &&
+      info_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
+   {
+      info_ptr->bit_depth = 16;
+   }
+#endif
+
 #ifdef PNG_READ_BACKGROUND_SUPPORTED
    if (png_ptr->transformations & PNG_BACKGROUND)
    {
@@ -1348,7 +1379,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       info_ptr->channels = 1;
 
 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
+   if (png_ptr->transformations & PNG_STRIP_ALPHA)
       info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
 #endif
 
@@ -1402,16 +1433,11 @@ png_do_read_transformations(png_structp png_ptr)
 
    if (png_ptr->row_buf == NULL)
    {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-      char msg[50];
-
-      png_snprintf2(msg, 50,
-          "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number,
-          png_ptr->pass);
-      png_error(png_ptr, msg);
-#else
+      /* Prior to 1.5.3 this output row/pass where the NULL pointer is, but this
+       * error is incredibly rare and incredibly easy to debug without this
+       * information.
+       */
       png_error(png_ptr, "NULL row buffer");
-#endif
    }
 #ifdef PNG_WARN_UNINITIALIZED_ROW
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
@@ -1434,24 +1460,31 @@ png_do_read_transformations(png_structp png_ptr)
          png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1,
              png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
       }
+
       else
       {
          if (png_ptr->num_trans &&
              (png_ptr->transformations & PNG_EXPAND_tRNS))
             png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
                 &(png_ptr->trans_color));
-         else
 
+         else
             png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
                 NULL);
       }
    }
 #endif
 
+   /* Delay the 'expand 16' step until later for efficiency, so that the
+    * intermediate steps work with 8 bit data.
+    */
+
 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
-      png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
-          PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA));
+   if ((png_ptr->transformations & PNG_STRIP_ALPHA) &&
+      (png_ptr->row_info.color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
+      png_ptr->row_info.color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
+      png_do_strip_channel(&(png_ptr->row_info), png_ptr->row_buf + 1,
+         0 /* at_start == false, because SWAP_ALPHA happens later */);
 #endif
 
 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
@@ -1519,16 +1552,7 @@ png_do_read_transformations(png_structp png_ptr)
    if ((png_ptr->transformations & PNG_BACKGROUND) &&
        ((png_ptr->num_trans != 0) ||
        (png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
-      png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
-          &(png_ptr->trans_color), &(png_ptr->background)
-#ifdef PNG_READ_GAMMA_SUPPORTED
-          , &(png_ptr->background_1),
-          png_ptr->gamma_table, png_ptr->gamma_from_1,
-          png_ptr->gamma_to_1, png_ptr->gamma_16_table,
-          png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1,
-          png_ptr->gamma_shift
-#endif
-          );
+      png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr);
 #endif
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
@@ -1539,9 +1563,7 @@ png_do_read_transformations(png_structp png_ptr)
        (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) &&
 #endif
        (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE))
-      png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1,
-          png_ptr->gamma_table, png_ptr->gamma_16_table,
-          png_ptr->gamma_shift);
+      png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr);
 #endif
 
 #ifdef PNG_READ_16_TO_8_SUPPORTED
@@ -1560,6 +1582,16 @@ png_do_read_transformations(png_structp png_ptr)
    }
 #endif /* PNG_READ_QUANTIZE_SUPPORTED */
 
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+   /* Do the expansion now, after all the arithmetic has been done.  Notice
+    * that previous transformations can handle the PNG_EXPAND_16 flag if this
+    * is efficient (particularly true in the case of gamma correction, where
+    * better accuracy results faster!)
+    */
+   if (png_ptr->transformations & PNG_EXPAND_16)
+      png_do_expand_16(&png_ptr->row_info, png_ptr->row_buf + 1);
+#endif
+
 #ifdef PNG_READ_INVERT_SUPPORTED
    if (png_ptr->transformations & PNG_INVERT_MONO)
       png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -1587,6 +1619,9 @@ png_do_read_transformations(png_structp png_ptr)
 #endif
 
 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /*NOTE: this must be in the wrong place - what happens if BGR is set too?
+    * Need pngvalid to test this combo.
+    */
    /* If gray -> RGB, do so now only if we did not do so above */
    if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
        (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
@@ -1799,7 +1834,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row,
       switch (row_info->bit_depth)
       {
          default:
-            break; 
+            break;
 
          case 2:
          {
@@ -2668,11 +2703,13 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
    return rgb_error;
 }
 #endif
+#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
+#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
 /* Build a grayscale palette.  Palette is assumed to be 1 << bit_depth
  * large of png_color.  This lets grayscale images be treated as
  * paletted.  Most useful for gamma correction and simplification
- * of code.
+ * of code.  This API is not used internally.
  */
 void PNGAPI
 png_build_grayscale_palette(int bit_depth, png_colorp palette)
@@ -2722,24 +2759,28 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette)
       palette[i].blue = (png_byte)v;
    }
 }
+#endif
 
 
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
 #ifdef PNG_READ_BACKGROUND_SUPPORTED
 /* Replace any alpha or transparency with the supplied background color.
  * "background" is already in the screen gamma, while "background_1" is
  * at a gamma of 1.0.  Paletted files have already been taken care of.
  */
 void /* PRIVATE */
-png_do_background(png_row_infop row_info, png_bytep row,
-    png_const_color_16p trans_color, png_const_color_16p background
-#ifdef PNG_READ_GAMMA_SUPPORTED
-    , 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
-#endif
-    )
+png_do_background(png_row_infop row_info, png_bytep row, png_structp png_ptr)
 {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   png_const_bytep gamma_table = png_ptr->gamma_table;
+   png_const_bytep gamma_from_1 = png_ptr->gamma_from_1;
+   png_const_bytep gamma_to_1 = png_ptr->gamma_to_1;
+   png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table;
+   png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1;
+   png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1;
+   int gamma_shift = png_ptr->gamma_shift;
+#endif
+
    png_bytep sp, dp;
    png_uint_32 i;
    png_uint_32 row_width = row_info->width;
@@ -2747,9 +2788,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
    png_debug(1, "in png_do_background");
 
-   if (background != NULL &&
-      (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) ||
-      (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color)))
+   if (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) ||
+      row_info->color_type != PNG_COLOR_TYPE_PALETTE)
    {
       switch (row_info->color_type)
       {
@@ -2764,10 +2804,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
                   for (i = 0; i < row_width; i++)
                   {
                      if ((png_uint_16)((*sp >> shift) & 0x01)
-                        == trans_color->gray)
+                        == png_ptr->trans_color.gray)
                      {
                         *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
-                        *sp |= (png_byte)(background->gray << shift);
+                        *sp |= (png_byte)(png_ptr->background.gray << shift);
                      }
 
                      if (!shift)
@@ -2792,10 +2832,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      for (i = 0; i < row_width; i++)
                      {
                         if ((png_uint_16)((*sp >> shift) & 0x03)
-                            == trans_color->gray)
+                            == png_ptr->trans_color.gray)
                         {
                            *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
-                           *sp |= (png_byte)(background->gray << shift);
+                           *sp |= (png_byte)(png_ptr->background.gray << shift);
                         }
 
                         else
@@ -2826,10 +2866,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      for (i = 0; i < row_width; i++)
                      {
                         if ((png_uint_16)((*sp >> shift) & 0x03)
-                            == trans_color->gray)
+                            == png_ptr->trans_color.gray)
                         {
                            *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
-                           *sp |= (png_byte)(background->gray << shift);
+                           *sp |= (png_byte)(png_ptr->background.gray << shift);
                         }
 
                         if (!shift)
@@ -2855,10 +2895,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      for (i = 0; i < row_width; i++)
                      {
                         if ((png_uint_16)((*sp >> shift) & 0x0f)
-                            == trans_color->gray)
+                            == png_ptr->trans_color.gray)
                         {
                            *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
-                           *sp |= (png_byte)(background->gray << shift);
+                           *sp |= (png_byte)(png_ptr->background.gray << shift);
                         }
 
                         else
@@ -2889,10 +2929,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      for (i = 0; i < row_width; i++)
                      {
                         if ((png_uint_16)((*sp >> shift) & 0x0f)
-                            == trans_color->gray)
+                            == png_ptr->trans_color.gray)
                         {
                            *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
-                           *sp |= (png_byte)(background->gray << shift);
+                           *sp |= (png_byte)(png_ptr->background.gray << shift);
                         }
 
                         if (!shift)
@@ -2916,8 +2956,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      sp = row;
                      for (i = 0; i < row_width; i++, sp++)
                      {
-                        if (*sp == trans_color->gray)
-                           *sp = (png_byte)background->gray;
+                        if (*sp == png_ptr->trans_color.gray)
+                           *sp = (png_byte)png_ptr->background.gray;
 
                         else
                            *sp = gamma_table[*sp];
@@ -2929,8 +2969,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      sp = row;
                      for (i = 0; i < row_width; i++, sp++)
                      {
-                        if (*sp == trans_color->gray)
-                           *sp = (png_byte)background->gray;
+                        if (*sp == png_ptr->trans_color.gray)
+                           *sp = (png_byte)png_ptr->background.gray;
                      }
                   }
                   break;
@@ -2948,11 +2988,11 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
                         v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
 
-                        if (v == trans_color->gray)
+                        if (v == png_ptr->trans_color.gray)
                         {
                            /* Background is already in screen gamma */
-                           *sp = (png_byte)((background->gray >> 8) & 0xff);
-                           *(sp + 1) = (png_byte)(background->gray & 0xff);
+                           *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff);
+                           *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
                         }
 
                         else
@@ -2973,10 +3013,10 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
                         v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
 
-                        if (v == trans_color->gray)
+                        if (v == png_ptr->trans_color.gray)
                         {
-                           *sp = (png_byte)((background->gray >> 8) & 0xff);
-                           *(sp + 1) = (png_byte)(background->gray & 0xff);
+                           *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff);
+                           *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
                         }
                      }
                   }
@@ -2999,13 +3039,13 @@ png_do_background(png_row_infop row_info, png_bytep row,
                   sp = row;
                   for (i = 0; i < row_width; i++, sp += 3)
                   {
-                     if (*sp == trans_color->red &&
-                         *(sp + 1) == trans_color->green &&
-                         *(sp + 2) == trans_color->blue)
+                     if (*sp == png_ptr->trans_color.red &&
+                         *(sp + 1) == png_ptr->trans_color.green &&
+                         *(sp + 2) == png_ptr->trans_color.blue)
                      {
-                        *sp = (png_byte)background->red;
-                        *(sp + 1) = (png_byte)background->green;
-                        *(sp + 2) = (png_byte)background->blue;
+                        *sp = (png_byte)png_ptr->background.red;
+                        *(sp + 1) = (png_byte)png_ptr->background.green;
+                        *(sp + 2) = (png_byte)png_ptr->background.blue;
                      }
 
                      else
@@ -3022,13 +3062,13 @@ png_do_background(png_row_infop row_info, png_bytep row,
                   sp = row;
                   for (i = 0; i < row_width; i++, sp += 3)
                   {
-                     if (*sp == trans_color->red &&
-                         *(sp + 1) == trans_color->green &&
-                         *(sp + 2) == trans_color->blue)
+                     if (*sp == png_ptr->trans_color.red &&
+                         *(sp + 1) == png_ptr->trans_color.green &&
+                         *(sp + 2) == png_ptr->trans_color.blue)
                      {
-                        *sp = (png_byte)background->red;
-                        *(sp + 1) = (png_byte)background->green;
-                        *(sp + 2) = (png_byte)background->blue;
+                        *sp = (png_byte)png_ptr->background.red;
+                        *(sp + 1) = (png_byte)png_ptr->background.green;
+                        *(sp + 2) = (png_byte)png_ptr->background.blue;
                      }
                   }
                }
@@ -3049,16 +3089,17 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
                          + *(sp + 5));
 
-                     if (r == trans_color->red && g == trans_color->green &&
-                         b == trans_color->blue)
+                     if (r == png_ptr->trans_color.red &&
+                         g == png_ptr->trans_color.green &&
+                         b == png_ptr->trans_color.blue)
                      {
                         /* Background is already in screen gamma */
-                        *sp = (png_byte)((background->red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(background->red & 0xff);
-                        *(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(background->green & 0xff);
-                        *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(background->blue & 0xff);
+                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff);
+                        *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff);
+                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff);
+                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
                      }
 
                      else
@@ -3092,15 +3133,16 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
                          + *(sp + 5));
 
-                     if (r == trans_color->red && g == trans_color->green &&
-                         b == trans_color->blue)
+                     if (r == png_ptr->trans_color.red &&
+                         g == png_ptr->trans_color.green &&
+                         b == png_ptr->trans_color.blue)
                      {
-                        *sp = (png_byte)((background->red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(background->red & 0xff);
-                        *(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(background->green & 0xff);
-                        *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(background->blue & 0xff);
+                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff);
+                        *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff);
+                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff);
+                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
                      }
                   }
                }
@@ -3128,7 +3170,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      else if (a == 0)
                      {
                         /* Background is already in screen gamma */
-                        *dp = (png_byte)background->gray;
+                        *dp = (png_byte)png_ptr->background.gray;
                      }
 
                      else
@@ -3136,7 +3178,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_byte v, w;
 
                         v = gamma_to_1[*sp];
-                        png_composite(w, v, a, background_1->gray);
+                        png_composite(w, v, a, png_ptr->background_1.gray);
                         *dp = gamma_from_1[w];
                      }
                   }
@@ -3155,13 +3197,13 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
                      else if (a == 0)
-                        *dp = (png_byte)background->gray;
+                        *dp = (png_byte)png_ptr->background.gray;
 
                      else
-                        png_composite(*dp, *sp, a, background_1->gray);
+                        png_composite(*dp, *sp, a, png_ptr->background_1.gray);
 
 #else
-                     *dp = (png_byte)background->gray;
+                     *dp = (png_byte)png_ptr->background.gray;
 #endif
                   }
                }
@@ -3195,8 +3237,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
 #endif
                      {
                         /* Background is already in screen gamma */
-                        *dp = (png_byte)((background->gray >> 8) & 0xff);
-                        *(dp + 1) = (png_byte)(background->gray & 0xff);
+                        *dp = (png_byte)((png_ptr->background.gray >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
                      }
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
@@ -3205,7 +3247,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_uint_16 g, v, w;
 
                         g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
-                        png_composite_16(v, g, a, background_1->gray);
+                        png_composite_16(v, g, a, png_ptr->background_1.gray);
                         w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8];
                         *dp = (png_byte)((w >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(w & 0xff);
@@ -3232,8 +3274,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      else
 #endif
                      {
-                        *dp = (png_byte)((background->gray >> 8) & 0xff);
-                        *(dp + 1) = (png_byte)(background->gray & 0xff);
+                        *dp = (png_byte)((png_ptr->background.gray >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
                      }
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
@@ -3242,7 +3284,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_uint_16 g, v;
 
                         g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-                        png_composite_16(v, g, a, background_1->gray);
+                        png_composite_16(v, g, a, png_ptr->background_1.gray);
                         *dp = (png_byte)((v >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(v & 0xff);
                      }
@@ -3277,9 +3319,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      else if (a == 0)
                      {
                         /* Background is already in screen gamma */
-                        *dp = (png_byte)background->red;
-                        *(dp + 1) = (png_byte)background->green;
-                        *(dp + 2) = (png_byte)background->blue;
+                        *dp = (png_byte)png_ptr->background.red;
+                        *(dp + 1) = (png_byte)png_ptr->background.green;
+                        *(dp + 2) = (png_byte)png_ptr->background.blue;
                      }
 
                      else
@@ -3287,15 +3329,15 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_byte v, w;
 
                         v = gamma_to_1[*sp];
-                        png_composite(w, v, a, background_1->red);
+                        png_composite(w, v, a, png_ptr->background_1.red);
                         *dp = gamma_from_1[w];
 
                         v = gamma_to_1[*(sp + 1)];
-                        png_composite(w, v, a, background_1->green);
+                        png_composite(w, v, a, png_ptr->background_1.green);
                         *(dp + 1) = gamma_from_1[w];
 
                         v = gamma_to_1[*(sp + 2)];
-                        png_composite(w, v, a, background_1->blue);
+                        png_composite(w, v, a, png_ptr->background_1.blue);
                         *(dp + 2) = gamma_from_1[w];
                      }
                   }
@@ -3318,20 +3360,20 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
                      else if (a == 0)
                      {
-                        *dp = (png_byte)background->red;
-                        *(dp + 1) = (png_byte)background->green;
-                        *(dp + 2) = (png_byte)background->blue;
+                        *dp = (png_byte)png_ptr->background.red;
+                        *(dp + 1) = (png_byte)png_ptr->background.green;
+                        *(dp + 2) = (png_byte)png_ptr->background.blue;
                      }
 
                      else
                      {
-                        png_composite(*dp, *sp, a, background->red);
+                        png_composite(*dp, *sp, a, png_ptr->background.red);
 
                         png_composite(*(dp + 1), *(sp + 1), a,
-                            background->green);
+                            png_ptr->background.green);
 
                         png_composite(*(dp + 2), *(sp + 2), a,
-                            background->blue);
+                            png_ptr->background.blue);
                      }
                   }
                }
@@ -3369,12 +3411,12 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      else if (a == 0)
                      {
                         /* Background is already in screen gamma */
-                        *dp = (png_byte)((background->red >> 8) & 0xff);
-                        *(dp + 1) = (png_byte)(background->red & 0xff);
-                        *(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
-                        *(dp + 3) = (png_byte)(background->green & 0xff);
-                        *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
-                        *(dp + 5) = (png_byte)(background->blue & 0xff);
+                        *dp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+                        *(dp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(png_ptr->background.green & 0xff);
+                        *(dp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
                      }
 
                      else
@@ -3382,21 +3424,21 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_uint_16 v, w, x;
 
                         v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
-                        png_composite_16(w, v, a, background_1->red);
+                        png_composite_16(w, v, a, png_ptr->background_1.red);
 
                         x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
                         *dp = (png_byte)((x >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(x & 0xff);
 
                         v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
-                        png_composite_16(w, v, a, background_1->green);
+                        png_composite_16(w, v, a, png_ptr->background_1.green);
 
                         x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
                         *(dp + 2) = (png_byte)((x >> 8) & 0xff);
                         *(dp + 3) = (png_byte)(x & 0xff);
 
                         v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
-                        png_composite_16(w, v, a, background_1->blue);
+                        png_composite_16(w, v, a, png_ptr->background_1.blue);
 
                         x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8];
                         *(dp + 4) = (png_byte)((x >> 8) & 0xff);
@@ -3422,12 +3464,12 @@ png_do_background(png_row_infop row_info, png_bytep row,
 
                      else if (a == 0)
                      {
-                        *dp = (png_byte)((background->red >> 8) & 0xff);
-                        *(dp + 1) = (png_byte)(background->red & 0xff);
-                        *(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
-                        *(dp + 3) = (png_byte)(background->green & 0xff);
-                        *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
-                        *(dp + 5) = (png_byte)(background->blue & 0xff);
+                        *dp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+                        *(dp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+                        *(dp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff);
+                        *(dp + 3) = (png_byte)(png_ptr->background.green & 0xff);
+                        *(dp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff);
+                        *(dp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
                      }
 
                      else
@@ -3440,15 +3482,15 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
                             + *(sp + 5));
 
-                        png_composite_16(v, r, a, background->red);
+                        png_composite_16(v, r, a, png_ptr->background.red);
                         *dp = (png_byte)((v >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(v & 0xff);
 
-                        png_composite_16(v, g, a, background->green);
+                        png_composite_16(v, g, a, png_ptr->background.green);
                         *(dp + 2) = (png_byte)((v >> 8) & 0xff);
                         *(dp + 3) = (png_byte)(v & 0xff);
 
-                        png_composite_16(v, b, a, background->blue);
+                        png_composite_16(v, b, a, png_ptr->background.blue);
                         *(dp + 4) = (png_byte)((v >> 8) & 0xff);
                         *(dp + 5) = (png_byte)(v & 0xff);
                      }
@@ -3483,10 +3525,12 @@ png_do_background(png_row_infop row_info, png_bytep row,
  * build_gamma_table().
  */
 void /* PRIVATE */
-png_do_gamma(png_row_infop row_info, png_bytep row,
-    png_const_bytep gamma_table, png_const_uint_16pp gamma_16_table,
-    int gamma_shift)
+png_do_gamma(png_row_infop row_info, png_bytep row, png_structp png_ptr)
 {
+   png_const_bytep gamma_table = png_ptr->gamma_table;
+   png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table;
+   int gamma_shift = png_ptr->gamma_shift;
+
    png_bytep sp;
    png_uint_32 i;
    png_uint_32 row_width=row_info->width;
@@ -4059,6 +4103,37 @@ png_do_expand(png_row_infop row_info, png_bytep row,
 }
 #endif
 
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+/* If the bit depth is 8 and the colour type is not a palette type expand the
+ * whole row to 16 bits.  Has no effect otherwise.
+ */
+void /* PRIVATE */
+png_do_expand_16(png_row_infop row_info, png_bytep row)
+{
+   if (row_info->bit_depth == 8 &&
+      row_info->color_type != PNG_COLOR_TYPE_PALETTE)
+   {
+      /* The row have a sequence of bytes containing [0..255] and we need
+       * to turn it into another row containing [0..65535], to do this we
+       * calculate:
+       *
+       *  (input / 255) * 65535
+       *
+       *  Which happens to be exactly input * 257 and this can be achieved
+       *  simply by byte replication in place (copying backwards).
+       */
+      png_byte *sp = row + row_info->rowbytes; /* source, last byte + 1 */
+      png_byte *dp = sp + row_info->rowbytes;  /* destination, end + 1 */
+      while (dp > sp)
+         dp[-2] = dp[-1] = *--sp, dp -= 2;
+
+      row_info->rowbytes *= 2;
+      row_info->bit_depth = 16;
+      row_info->pixel_depth = (png_byte)(row_info->channels * 16);
+   }
+}
+#endif
+
 #ifdef PNG_READ_QUANTIZE_SUPPORTED
 void /* PRIVATE */
 png_do_quantize(png_row_infop row_info, png_bytep row,
@@ -4152,6 +4227,7 @@ png_do_quantize(png_row_infop row_info, png_bytep row,
    }
 }
 #endif /* PNG_READ_QUANTIZE_SUPPORTED */
+#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
 #ifdef PNG_MNG_FEATURES_SUPPORTED
 /* Undoes intrapixel differencing  */

pngrutil.c

@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -278,8 +278,7 @@ png_crc_error(png_structp png_ptr)
       return (0);
 }
 
-#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
-    defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
 static png_size_t
 png_inflate(png_structp png_ptr, png_bytep data, png_size_t size,
     png_bytep output, png_size_t output_size)
@@ -370,41 +369,31 @@ png_inflate(png_structp png_ptr, png_bytep data, png_size_t size,
        * and the error message is dumped into the uncompressed
        * buffer if available.
        */
+#     ifdef PNG_WARNINGS_SUPPORTED
       {
-         PNG_CONST char *msg;
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-         char umsg[52];
-#endif
+         png_const_charp msg;
+
          if (png_ptr->zstream.msg != 0)
             msg = png_ptr->zstream.msg;
 
-         else
+         else switch (ret)
          {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-            switch (ret)
-            {
-               case Z_BUF_ERROR:
-                  msg = "Buffer error in compressed datastream in %s chunk";
-                  break;
+            case Z_BUF_ERROR:
+               msg = "Buffer error in compressed datastream";
+               break;
 
-               case Z_DATA_ERROR:
-                  msg = "Data error in compressed datastream in %s chunk";
-                  break;
+            case Z_DATA_ERROR:
+               msg = "Data error in compressed datastream";
+               break;
 
-               default:
-                  msg = "Incomplete compressed datastream in %s chunk";
-                  break;
-            }
-
-            png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name);
-            msg = umsg;
-#else
-            msg = "Damaged compressed datastream in chunk other than IDAT";
-#endif
+            default:
+               msg = "Incomplete compressed datastream";
+               break;
          }
 
-         png_warning(png_ptr, msg);
+         png_chunk_warning(png_ptr, msg);
       }
+#     endif
 
       /* 0 means an error - notice that this code simply ignores
        * zero length compressed chunks as a result.
@@ -438,8 +427,8 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
       png_size_t expanded_size = png_inflate(png_ptr,
           (png_bytep)(png_ptr->chunkdata + prefix_size),
           chunklength - prefix_size,
-          0,            /*output*/
-          0);           /*output size*/
+          0,            /* output */
+          0);           /* output size */
 
       /* Now check the limits on this chunk - if the limit fails the
        * compressed data will be removed, the prefix will remain.
@@ -500,15 +489,9 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
 
    else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
    {
-#ifdef PNG_STDIO_SUPPORTED
-      char umsg[50];
-
-      png_snprintf(umsg, sizeof umsg,
-          "Unknown zTXt compression type %d", comp_type);
-      png_warning(png_ptr, umsg);
-#else
-      png_warning(png_ptr, "Unknown zTXt compression type");
-#endif
+      PNG_WARNING_PARAMETERS(p)
+      png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, comp_type);
+      png_formatted_warning(png_ptr, p, "Unknown zTXt compression type @1");
 
       /* The recovery is to simply drop the data. */
    }
@@ -536,7 +519,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
 
    *newlength = prefix_size;
 }
-#endif
+#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */
 
 /* Read and check the IDHR chunk */
 void /* PRIVATE */
@@ -608,7 +591,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
    png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
    png_debug1(3, "channels = %d", png_ptr->channels);
-   png_debug1(3, "rowbytes = %u", png_ptr->rowbytes);
+   png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes);
    png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
        color_type, interlace_type, compression_type, filter_type);
 }
@@ -846,12 +829,10 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    {
       if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
       {
-         png_warning(png_ptr,
-             "Ignoring incorrect gAMA value when sRGB is also present");
-
-#    ifdef PNG_CONSOLE_IO_SUPPORTED
-         fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
-#    endif
+         PNG_WARNING_PARAMETERS(p)
+         png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, igamma);
+         png_formatted_warning(png_ptr, p,
+             "Ignoring incorrect gAMA value @1 when sRGB is also present");
          return;
       }
    }
@@ -1020,16 +1001,20 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           PNG_OUT_OF_RANGE(x_blue,  15000,  1000) ||
           PNG_OUT_OF_RANGE(y_blue,   6000,  1000))
       {
-         png_warning(png_ptr,
-             "Ignoring incorrect cHRM value when sRGB is also present");
+         PNG_WARNING_PARAMETERS(p)
 
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-         fprintf(stderr, "wx=%d, wy=%d, rx=%d, ry=%d\n",
-             x_white, y_white, x_red, y_red);
+         png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, x_white);
+         png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_fixed, y_white);
+         png_warning_parameter_signed(p, 3, PNG_NUMBER_FORMAT_fixed, x_red);
+         png_warning_parameter_signed(p, 4, PNG_NUMBER_FORMAT_fixed, y_red);
+         png_warning_parameter_signed(p, 5, PNG_NUMBER_FORMAT_fixed, x_green);
+         png_warning_parameter_signed(p, 6, PNG_NUMBER_FORMAT_fixed, y_green);
+         png_warning_parameter_signed(p, 7, PNG_NUMBER_FORMAT_fixed, x_blue);
+         png_warning_parameter_signed(p, 8, PNG_NUMBER_FORMAT_fixed, y_blue);
 
-         fprintf(stderr, "gx=%d, gy=%d, bx=%d, by=%d\n",
-             x_green, y_green, x_blue, y_blue);
-#endif /* PNG_CONSOLE_IO_SUPPORTED */
+         png_formatted_warning(png_ptr, p,
+             "Ignoring incorrect cHRM white(@1,@2) r(@3,@4)g(@5,@6)b(@7,@8) "
+             "when sRGB is also present");
       }
       return;
    }
@@ -1096,11 +1081,13 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    {
       if (PNG_OUT_OF_RANGE(info_ptr->gamma, 45500L, 500))
       {
-         png_warning(png_ptr,
-             "Ignoring incorrect gAMA value when sRGB is also present");
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-         fprintf(stderr, "incorrect gamma=(%d/100000)\n", info_ptr->gamma);
-#endif
+         PNG_WARNING_PARAMETERS(p)
+
+         png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed,
+            info_ptr->gamma);
+
+         png_formatted_warning(png_ptr, p,
+             "Ignoring incorrect gAMA value @1 when sRGB is also present");
       }
    }
 #endif /* PNG_READ_gAMA_SUPPORTED */
@@ -1240,23 +1227,15 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    /* And the following guarantees that profile_size == profile_length. */
    if (profile_size > profile_length)
    {
+      PNG_WARNING_PARAMETERS(p)
+
       png_free(png_ptr, png_ptr->chunkdata);
       png_ptr->chunkdata = NULL;
-#ifdef PNG_STDIO_SUPPORTED
-      {
-         char umsg[80];
 
-         png_snprintf2(umsg, 80,
-             "Ignoring iCCP chunk with declared size = %u "
-              "and actual length = %u",
-              (unsigned int) profile_size,
-              (unsigned int) profile_length);
-         png_warning(png_ptr, umsg);
-      }
-#else
-      png_warning(png_ptr,
-         "Ignoring iCCP chunk with uncompressed size mismatch");
-#endif
+      png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_u, profile_size);
+      png_warning_parameter_unsigned(p, 2, PNG_NUMBER_FORMAT_u, profile_length);
+      png_formatted_warning(png_ptr, p,
+         "Ignoring iCCP chunk with declared size = @1 and actual length = @2");
       return;
    }
 
@@ -1275,9 +1254,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
    png_bytep entry_start;
    png_sPLT_t new_palette;
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
    png_sPLT_entryp pp;
-#endif
    png_uint_32 data_length;
    int entry_size, i;
    png_uint_32 skip = 0;
@@ -1442,7 +1419,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
          pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
       }
 
-      pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+      pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2;
    }
 #endif
 
@@ -1962,7 +1939,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   png_size_t slength, index;
+   png_size_t slength, i;
    int state;
 
    png_debug(1, "in png_handle_sCAL");
@@ -2019,21 +1996,21 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    /* Validate the ASCII numbers, need two ASCII numbers separated by
     * a '\0' and they need to fit exactly in the chunk data.
     */
-   index = 0;
+   i = 0;
    state = 0;
 
    if (png_ptr->chunkdata[1] == 45 /* negative width */ ||
-       !png_check_fp_number(png_ptr->chunkdata, slength, &state, &index) ||
-       index >= slength || png_ptr->chunkdata[index++] != 0)
+       !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) ||
+       i >= slength || png_ptr->chunkdata[i++] != 0)
       png_warning(png_ptr, "Invalid sCAL chunk ignored: bad width format");
 
    else
    {
-      png_size_t heighti = index;
+      png_size_t heighti = i;
 
-      if (png_ptr->chunkdata[index] == 45 /* negative height */ ||
-          !png_check_fp_number(png_ptr->chunkdata, slength, &state, &index) ||
-          index != slength)
+      if (png_ptr->chunkdata[i] == 45 /* negative height */ ||
+          !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) ||
+          i != slength)
          png_warning(png_ptr, "Invalid sCAL chunk ignored: bad height format");
 
       else
@@ -3400,7 +3377,9 @@ png_read_start_row(png_structp png_ptr)
 
    png_debug(1, "in png_read_start_row");
    png_ptr->zstream.avail_in = 0;
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
    png_init_read_transformations(png_ptr);
+#endif
 #ifdef PNG_READ_INTERLACING_SUPPORTED
    if (png_ptr->interlaced)
    {
@@ -3463,6 +3442,24 @@ png_read_start_row(png_structp png_ptr)
    }
 #endif
 
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+   if (png_ptr->transformations & PNG_EXPAND_16)
+   {
+#     ifdef PNG_READ_EXPAND_SUPPORTED
+         /* In fact it is an error if it isn't supported, but checking is
+          * the safe way.
+          */
+         if (png_ptr->transformations & PNG_EXPAND)
+         {
+            if (png_ptr->bit_depth < 16)
+               max_pixel_depth *= 2;
+         }
+         else
+#     endif
+         png_ptr->transformations &= ~PNG_EXPAND_16;
+   }
+#endif
+
 #ifdef PNG_READ_FILLER_SUPPORTED
    if (png_ptr->transformations & (PNG_FILLER))
    {
@@ -3607,9 +3604,9 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    png_debug1(3, "height = %u,", png_ptr->height);
    png_debug1(3, "iwidth = %u,", png_ptr->iwidth);
    png_debug1(3, "num_rows = %u,", png_ptr->num_rows);
-   png_debug1(3, "rowbytes = %u,", png_ptr->rowbytes);
-   png_debug1(3, "irowbytes = %u",
-       PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
+   png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes);
+   png_debug1(3, "irowbytes = %lu",
+       (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;
 }

pngset.c

@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -87,7 +87,7 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_gAMA_SUPPORTED
 void PNGFAPI
 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
-    gamma)
+    file_gamma)
 {
    png_debug1(1, "in %s storage function", "gAMA");
 
@@ -98,15 +98,15 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
     * wrong, therefore storing them (and setting PNG_INFO_gAMA)
     * must be wrong too.
     */
-   if (gamma > (png_fixed_point)PNG_UINT_31_MAX)
+   if (file_gamma > (png_fixed_point)PNG_UINT_31_MAX)
       png_warning(png_ptr, "Gamma too large, ignored");
 
-   else if (gamma <= 0)
+   else if (file_gamma <= 0)
       png_warning(png_ptr, "Negative or zero gamma ignored");
 
    else
    {
-      info_ptr->gamma = gamma;
+      info_ptr->gamma = file_gamma;
       info_ptr->valid |= PNG_INFO_gAMA;
    }
 }
@@ -341,18 +341,18 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
       png_error(png_ptr, "Invalid sCAL unit");
 
    if (swidth == NULL || (lengthw = png_strlen(swidth)) <= 0 ||
-       swidth[0] == 45 /*'-'*/ || !png_check_fp_string(swidth, lengthw))
+       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))
+       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
       png_error(png_ptr, "Invalid sCAL height");
 
    info_ptr->scal_unit = (png_byte)unit;
 
    ++lengthw;
 
-   png_debug1(3, "allocating unit for info (%u bytes)", lengthw);
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
 
    info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw);
 
@@ -366,7 +366,7 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 
    ++lengthh;
 
-   png_debug1(3, "allocating unit for info (%u bytes)", lengthh);
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
 
    info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh);
 
@@ -522,27 +522,27 @@ 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)
 {
    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
    png_set_gAMA_fixed(png_ptr, info_ptr, 45455L);
@@ -751,10 +751,10 @@ png_set_text_2(png_structp png_ptr, png_infop info_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';

pngstruct.h

@@ -5,7 +5,7 @@
  * (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 1.5.0 [January 6, 2011]
+ * 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
@@ -29,11 +29,13 @@
 struct png_struct_def
 {
 #ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf png_jmpbuf;            /* used in png_error */
+   jmp_buf longjmp_buffer;    /* used in png_error */
    png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
 #endif
    png_error_ptr error_fn;    /* function for printing errors and aborting */
+#ifdef PNG_WARNINGS_SUPPORTED
    png_error_ptr warning_fn;  /* function for printing warnings */
+#endif
    png_voidp error_ptr;       /* user supplied struct for error functions */
    png_rw_ptr write_data_fn;  /* function for writing output data */
    png_rw_ptr read_data_fn;   /* function for reading input data */
@@ -64,11 +66,36 @@ struct png_struct_def
    z_stream zstream;          /* pointer to decompression structure (below) */
    png_bytep zbuf;            /* buffer for zlib */
    uInt zbuf_size;            /* size of zbuf (typically 65536) */
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Added in 1.5.3: state to keep track of whether the zstream has been
+ * initialized and if so whether it is for IDAT or some other chunk.
+ */
+#define PNG_ZLIB_UNINITIALIZED 0
+#define PNG_ZLIB_FOR_IDAT      1
+#define PNG_ZLIB_FOR_TEXT      2 /* anything other than IDAT */
+#define PNG_ZLIB_USE_MASK      3 /* bottom two bits */
+#define PNG_ZLIB_IN_USE        4 /* a flag value */
+
+   png_uint_32 zlib_state;       /* State of zlib initialization */
+/* End of material added at libpng 1.5.3 */
+
    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 */
+#endif
+/* Added at libpng 1.5.3 */
+#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \
+    defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION)
+   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 */
+#endif
+/* 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 */
@@ -209,7 +236,7 @@ struct png_struct_def
 #endif
 
 #ifdef PNG_TIME_RFC1123_SUPPORTED
-   png_charp time_buffer; /* String to hold RFC 1123 time text */
+   char time_buffer[29]; /* String to hold RFC 1123 time text */
 #endif
 
 /* New members added in libpng-1.0.6 */

pngtest.c

@@ -1,7 +1,7 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -31,6 +31,8 @@
  * of files at once by typing "pngtest -m file1.png file2.png ..."
  */
 
+#define _POSIX_SOURCE 1
+
 #include "zlib.h"
 #include "png.h"
 /* Copied from pngpriv.h but only used in error messages below. */
@@ -779,7 +781,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    int bit_depth, color_type;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
-   jmp_buf png_jmpbuf;
+   jmp_buf tmp_jmpbuf;
 #endif
 #endif
 
@@ -848,7 +850,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_SETJMP_SUPPORTED
    pngtest_debug("Setting jmpbuf for read struct");
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(png_jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(read_ptr)))
 #endif
@@ -866,14 +868,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       return (1);
    }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(read_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(read_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
    pngtest_debug("Setting jmpbuf for write struct");
 #ifdef USE_FAR_KEYWORD
 
-   if (setjmp(png_jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(write_ptr)))
 #endif
@@ -890,7 +892,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    }
 
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(write_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(write_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 #endif
 #endif
@@ -913,6 +915,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #  endif
 #endif
 
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
+   /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
+    * This is here just to make pngtest replicate the results from libpng
+    * versions prior to 1.5.3, and to test this new API.
+    */
+   png_set_text_compression_strategy(write_ptr, Z_FILTERED);
+#endif
+
    if (status_dots_requested == 1)
    {
 #ifdef PNG_WRITE_SUPPORTED
@@ -1784,4 +1794,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_1beta01 Your_png_h_is_not_version_1_5_1beta01;
+typedef png_libpng_version_1_5_3beta05 Your_png_h_is_not_version_1_5_3beta05;

pngtrans.c

@@ -1,7 +1,7 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -424,170 +424,119 @@ 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.
+    *
+    * at_start:        0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
+    *            nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
+    */
+
+   /* 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 channel 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) /* Skip initial filler */
+            sp += 2;
+         else          /* Skip initial channel and, for sp, the filler */
+            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_byte)(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) /* Skip initial filler */
+            sp += 2;
+         else          /* Skip initial channels and, for sp, the filler */
+            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
 
@@ -672,6 +621,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 
 #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)
@@ -680,34 +630,49 @@ 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 */
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngwrite.c

@@ -1,7 +1,7 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -462,10 +462,9 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
    png_structp png_ptr;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
-   jmp_buf png_jmpbuf;
+   jmp_buf tmp_jmpbuf;
 #endif
 #endif
-   int i;
 
    png_debug(1, "in png_create_write_struct");
 
@@ -489,12 +488,12 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
    encounter a png_error() will longjmp here.  Since the jmpbuf is
    then meaningless we abort instead of returning. */
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(png_jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
    if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */
 #endif
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
       PNG_ABORT();
 #endif
@@ -504,49 +503,8 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
-   if (user_png_ver)
-   {
-      i = 0;
-      do
-      {
-         if (user_png_ver[i] != png_libpng_ver[i])
-            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-      } while (png_libpng_ver[i++]);
-   }
-
-   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
-   {
-     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
-      * we must recompile any applications that use any older library version.
-      * For versions after libpng 1.0, we will be compatible, so we need
-      * only check the first digit.
-      */
-     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
-         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
-         (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
-     {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-        char msg[80];
-
-        if (user_png_ver)
-        {
-            png_snprintf2(msg, 80,
-                "Application built with libpng-%.20s"
-                " but running with %.20s",
-                user_png_ver,
-                png_libpng_ver);
-            png_warning(png_ptr, msg);
-         }
-#else
-         png_warning(png_ptr,
-             "Incompatible libpng version in application and library");
-#endif
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-        png_ptr->flags = 0;
-#endif
-        png_cleanup_needed = 1;
-     }
-   }
+   if (!png_user_version_check(png_ptr, user_png_ver))
+      png_cleanup_needed = 1;
 
    /* Initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@@ -783,7 +741,8 @@ png_write_row(png_structp png_ptr, png_const_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);
@@ -804,9 +763,11 @@ png_write_row(png_structp png_ptr, png_const_bytep row)
    }
 #endif
 
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
    /* Handle other transformations */
    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
+#endif
 
 #ifdef PNG_MNG_FEATURES_SUPPORTED
    /* Write filter_method 64 (intrapixel differencing) only if
@@ -883,8 +844,6 @@ png_write_flush(png_structp png_ptr)
       {
          /* Write the IDAT and reset the zlib output buffer */
          png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
-         png_ptr->zstream.next_out = png_ptr->zbuf;
-         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
          wrote_IDAT = 1;
       }
    } while (wrote_IDAT == 1);
@@ -895,8 +854,6 @@ png_write_flush(png_structp png_ptr)
       /* Write the IDAT and reset the zlib output buffer */
       png_write_IDAT(png_ptr, png_ptr->zbuf,
           png_ptr->zbuf_size - png_ptr->zstream.avail_out);
-      png_ptr->zstream.next_out = png_ptr->zbuf;
-      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
    }
    png_ptr->flush_rows = 0;
    png_flush(png_ptr);
@@ -982,7 +939,9 @@ png_write_destroy(png_structp png_ptr)
    jmp_buf tmp_jmp; /* Save jump buffer */
 #endif
    png_error_ptr error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    png_error_ptr warning_fn;
+#endif
    png_voidp error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_free_ptr free_fn;
@@ -991,7 +950,8 @@ png_write_destroy(png_structp png_ptr)
    png_debug(1, "in png_write_destroy");
 
    /* Free any memory zlib uses */
-   deflateEnd(&png_ptr->zstream);
+   if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED)
+      deflateEnd(&png_ptr->zstream);
 
    /* Free our memory.  png_free checks NULL for us. */
    png_free(png_ptr, png_ptr->zbuf);
@@ -1004,10 +964,6 @@ png_write_destroy(png_structp png_ptr)
    png_free(png_ptr, png_ptr->paeth_row);
 #endif
 
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-   png_free(png_ptr, png_ptr->time_buffer);
-#endif
-
 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
    /* Use this to save a little code space, it doesn't free the filter_costs */
    png_reset_filter_heuristics(png_ptr);
@@ -1017,11 +973,13 @@ png_write_destroy(png_structp png_ptr)
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* Reset structure */
-   png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
 #endif
 
    error_fn = png_ptr->error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    warning_fn = png_ptr->warning_fn;
+#endif
    error_ptr = png_ptr->error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    free_fn = png_ptr->free_fn;
@@ -1030,14 +988,16 @@ png_write_destroy(png_structp png_ptr)
    png_memset(png_ptr, 0, png_sizeof(png_struct));
 
    png_ptr->error_fn = error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
    png_ptr->warning_fn = warning_fn;
+#endif
    png_ptr->error_ptr = error_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr->free_fn = free_fn;
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+   png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf));
 #endif
 }
 
@@ -1176,7 +1136,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
  * better compression.
  */
 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED      /* GRR 970116 */
-/* Conveneince reset API. */
+/* Convenience reset API. */
 static void
 png_reset_filter_heuristics(png_structp png_ptr)
 {
@@ -1490,6 +1450,86 @@ 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)
 {
@@ -1556,7 +1596,7 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
 #endif
 
 #ifdef PNG_WRITE_FILLER_SUPPORTED
-   /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
+   /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */
    if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
       png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
 

pngwtran.c

@@ -1,7 +1,7 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -15,6 +15,7 @@
 
 #ifdef PNG_WRITE_SUPPORTED
 
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
 /* Transform the data according to the user's wishes.  The order of
  * transformations is significant.
  */
@@ -44,8 +45,8 @@ png_do_write_transformations(png_structp png_ptr)
 
 #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_FLAG_FILLER_AFTER));
 #endif
 
 #ifdef PNG_WRITE_PACKSWAP_SUPPORTED
@@ -563,6 +564,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
    }
 }
 #endif
+#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
 
 #ifdef PNG_MNG_FEATURES_SUPPORTED
 /* Undoes intrapixel differencing  */

pngwutil.c

@@ -1,7 +1,7 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * 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.)
@@ -192,7 +192,149 @@ png_write_chunk_end(png_structp png_ptr)
    png_write_data(png_ptr, buf, (png_size_t)4);
 }
 
-#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
+/* Initialize the compressor for the appropriate type of compression. */
+static void
+png_zlib_claim(png_structp png_ptr, png_uint_32 state)
+{
+   if (!(png_ptr->zlib_state & PNG_ZLIB_IN_USE))
+   {
+      /* If already initialized for 'state' do not re-init. */
+      if (png_ptr->zlib_state != state)
+      {
+         int ret = Z_OK;
+         png_const_charp who = "-";
+
+         /* If actually initialized for another state do a deflateEnd. */
+         if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED)
+         {
+            ret = deflateEnd(&png_ptr->zstream);
+            who = "end";
+            png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED;
+         }
+
+         /* zlib itself detects an incomplete state on deflateEnd */
+         if (ret == Z_OK) switch (state)
+         {
+#           ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
+               case PNG_ZLIB_FOR_TEXT:
+                  ret = deflateInit2(&png_ptr->zstream,
+                     png_ptr->zlib_text_level, png_ptr->zlib_text_method,
+                     png_ptr->zlib_text_window_bits,
+                     png_ptr->zlib_text_mem_level, png_ptr->zlib_text_strategy);
+                  who = "text";
+                  break;
+#           endif
+
+            case PNG_ZLIB_FOR_IDAT:
+               ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
+                   png_ptr->zlib_method, png_ptr->zlib_window_bits,
+                   png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+               who = "IDAT";
+               break;
+
+            default:
+               png_error(png_ptr, "invalid zlib state");
+         }
+
+         if (ret == Z_OK)
+            png_ptr->zlib_state = state;
+
+         else /* an error in deflateEnd or deflateInit2 */
+         {
+            size_t pos = 0;
+            char msg[64];
+
+            pos = png_safecat(msg, sizeof msg, pos,
+               "zlib failed to initialize compressor (");
+            pos = png_safecat(msg, sizeof msg, pos, who);
+
+            switch (ret)
+            {
+               case Z_VERSION_ERROR:
+                  pos = png_safecat(msg, sizeof msg, pos, ") version error");
+                  break;
+
+               case Z_STREAM_ERROR:
+                  pos = png_safecat(msg, sizeof msg, pos, ") stream error");
+                  break;
+
+               case Z_MEM_ERROR:
+                  pos = png_safecat(msg, sizeof msg, pos, ") memory error");
+                  break;
+
+               default:
+                  pos = png_safecat(msg, sizeof msg, pos, ") unknown error");
+                  break;
+            }
+
+            png_error(png_ptr, msg);
+         }
+      }
+
+      /* Here on success, claim the zstream: */
+      png_ptr->zlib_state |= PNG_ZLIB_IN_USE;
+   }
+
+   else
+      png_error(png_ptr, "zstream already in use (internal error)");
+}
+
+/* The opposite: release the stream.  It is also reset, this API will warn on
+ * error but will not fail.
+ */
+static void
+png_zlib_release(png_structp png_ptr)
+{
+   if (png_ptr->zlib_state & PNG_ZLIB_IN_USE)
+   {
+      int ret = deflateReset(&png_ptr->zstream);
+
+      png_ptr->zlib_state &= ~PNG_ZLIB_IN_USE;
+
+      if (ret != Z_OK)
+      {
+         png_const_charp err;
+         png_warning_parameters p;
+
+         switch (ret)
+         {
+            case Z_VERSION_ERROR:
+               err = "version";
+               break;
+
+            case Z_STREAM_ERROR:
+               err = "stream";
+               break;
+
+            case Z_MEM_ERROR:
+               err = "memory";
+               break;
+
+            default:
+               err = "unknown";
+               break;
+         }
+
+         png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_d, ret);
+         png_warning_parameter(p, 2, err);
+
+         if (png_ptr->zstream.msg)
+            err = png_ptr->zstream.msg;
+         else
+            err = "[no zlib message]";
+
+         png_warning_parameter(p, 3, err);
+
+         png_formatted_warning(png_ptr, p,
+            "zlib failed to reset compressor: @1(@2): @3");
+      }
+   }
+
+   else
+      png_warning(png_ptr, "zstream not in use (internal error)");
+}
+
+#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
 /* This pair of functions encapsulates the operation of (a) compressing a
  * text string, and (b) issuing it later as a series of chunk data writes.
  * The compression_state structure is shared context for these functions
@@ -220,25 +362,22 @@ png_text_compress(png_structp png_ptr,
    comp->max_output_ptr = 0;
    comp->output_ptr = NULL;
    comp->input = NULL;
-   comp->input_len = 0;
+   comp->input_len = text_len;
 
    /* We may just want to pass the text right through */
    if (compression == PNG_TEXT_COMPRESSION_NONE)
    {
       comp->input = (png_const_bytep)text;
-      comp->input_len = text_len;
       return((int)text_len);
    }
 
    if (compression >= PNG_TEXT_COMPRESSION_LAST)
    {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-      char msg[50];
-      png_snprintf(msg, 50, "Unknown compression type %d", compression);
-      png_warning(png_ptr, msg);
-#else
-      png_warning(png_ptr, "Unknown compression type");
-#endif
+      PNG_WARNING_PARAMETERS(p)
+
+      png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d,
+         compression);
+      png_formatted_warning(png_ptr, p, "Unknown compression type @1");
    }
 
    /* We can't write the chunk until we find out how much data we have,
@@ -255,10 +394,12 @@ png_text_compress(png_structp png_ptr,
     * data, or if the input string is incredibly large (although this
     * wouldn't cause a failure, just a slowdown due to swapping).
     */
+   png_zlib_claim(png_ptr, PNG_ZLIB_FOR_TEXT);
 
    /* Set up the compression buffers */
    /* TODO: the following cast hides a potential overflow problem. */
    png_ptr->zstream.avail_in = (uInt)text_len;
+
    /* NOTE: assume zlib doesn't overwrite the input */
    png_ptr->zstream.next_in = (Bytef *)text;
    png_ptr->zstream.avail_out = png_ptr->zbuf_size;
@@ -418,6 +559,68 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
       return;
    }
 
+#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
+   if (comp->input_len >= 2 && comp->input_len < 16384)
+   {
+      unsigned int z_cmf;  /* zlib compression method and flags */
+
+      /* Optimize the CMF field in the zlib stream.  This hack of the zlib
+       * stream is compliant to the stream specification.
+       */
+
+      if (comp->num_output_ptr)
+        z_cmf = comp->output_ptr[0][0];
+      else
+        z_cmf = png_ptr->zbuf[0];
+
+      if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
+      {
+         unsigned int z_cinfo;
+         unsigned int half_z_window_size;
+         png_size_t uncompressed_text_size = comp->input_len;
+
+         z_cinfo = z_cmf >> 4;
+         half_z_window_size = 1 << (z_cinfo + 7);
+
+         while (uncompressed_text_size <= half_z_window_size &&
+             half_z_window_size >= 256)
+         {
+            z_cinfo--;
+            half_z_window_size >>= 1;
+         }
+
+         z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);
+
+         if (comp->num_output_ptr)
+         {
+
+           if (comp->output_ptr[0][0] != z_cmf)
+           {
+              int tmp;
+
+              comp->output_ptr[0][0] = (png_byte)z_cmf;
+              tmp = comp->output_ptr[0][1] & 0xe0;
+              tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;
+              comp->output_ptr[0][1] = (png_byte)tmp;
+           }
+         }
+         else
+         {
+            int tmp;
+
+            png_ptr->zbuf[0] = (png_byte)z_cmf;
+            tmp = png_ptr->zbuf[1] & 0xe0;
+            tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;
+            png_ptr->zbuf[1] = (png_byte)tmp;
+         }
+      }
+
+      else
+         png_error(png_ptr,
+             "Invalid zlib compression method or flags in non-IDAT chunk");
+   }
+#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */
+
    /* Write saved output buffers, if any */
    for (i = 0; i < comp->num_output_ptr; i++)
    {
@@ -436,10 +639,9 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
           (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
 
    /* Reset zlib for another zTXt/iTXt or image data */
-   deflateReset(&png_ptr->zstream);
-   png_ptr->zstream.data_type = Z_BINARY;
+   png_zlib_release(png_ptr);
 }
-#endif
+#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */
 
 /* Write the IHDR chunk, and update the png_struct with the necessary
  * information.  Note that the rest of this code depends upon this
@@ -451,7 +653,6 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
     int interlace_type)
 {
    PNG_IHDR;
-   int ret;
 
    png_byte buf[13]; /* Buffer to store the IHDR info */
 
@@ -632,35 +833,35 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
    if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
       png_ptr->zlib_method = 8;
 
-   ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
-       png_ptr->zlib_method, png_ptr->zlib_window_bits,
-       png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
+   if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_STRATEGY))
+      png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;
 
-   if (ret != Z_OK)
-   {
-      if (ret == Z_VERSION_ERROR)
-         png_error(png_ptr,
-            "zlib failed to initialize compressor -- version error");
+   if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_LEVEL))
+      png_ptr->zlib_text_level = png_ptr->zlib_level;
 
-      if (ret == Z_STREAM_ERROR)
-         png_error(png_ptr,
-             "zlib failed to initialize compressor -- stream error");
+   if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL))
+      png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level;
 
-      if (ret == Z_MEM_ERROR)
-         png_error(png_ptr,
-             "zlib failed to initialize compressor -- mem error");
+   if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS))
+      png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits;
 
-      png_error(png_ptr, "zlib failed to initialize compressor");
-   }
+   if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_METHOD))
+      png_ptr->zlib_text_method = png_ptr->zlib_method;
+#else
+   png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;
+   png_ptr->zlib_text_level = png_ptr->zlib_level;
+   png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level;
+   png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits;
+   png_ptr->zlib_text_method = png_ptr->zlib_method;
+#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
+#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */
 
-   png_ptr->zstream.next_out = png_ptr->zbuf;
-   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-   /* libpng is not interested in zstream.data_type, so set it
-    * to a predefined value, to avoid its evaluation inside zlib
-    */
-   png_ptr->zstream.data_type = Z_BINARY;
+   /* Record that the compressor has not yet been initialized. */
+   png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED;
 
-   png_ptr->mode = PNG_HAVE_IHDR;
+   png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */
 }
 
 /* Write the palette.  We are careful not to trust png_color to be in the
@@ -745,12 +946,15 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
 
    png_debug(1, "in png_write_IDAT");
 
-   /* Optimize the CMF field in the zlib stream. */
-   /* This hack of the zlib stream is compliant to the stream specification. */
+#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
    if (!(png_ptr->mode & PNG_HAVE_IDAT) &&
        png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
    {
+      /* Optimize the CMF field in the zlib stream.  This hack of the zlib
+       * stream is compliant to the stream specification.
+       */
       unsigned int z_cmf = data[0];  /* zlib compression method and flags */
+
       if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
       {
          /* Avoid memory underflows and multiplication overflows.
@@ -761,11 +965,29 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
          if (length >= 2 &&
              png_ptr->height < 16384 && png_ptr->width < 16384)
          {
+            /* Compute the maximum possible length of the datastream */
+
+            /* Number of pixels, plus for each row a filter byte and possible
+             * and possibly a padding byte, so increase the maximum
+             * size to account for these.
+             */
+            unsigned int z_cinfo;
+            unsigned int half_z_window_size;
             png_uint_32 uncompressed_idat_size = png_ptr->height *
                 ((png_ptr->width *
                 png_ptr->channels * png_ptr->bit_depth + 15) >> 3);
-            unsigned int z_cinfo = z_cmf >> 4;
-            unsigned int half_z_window_size = 1 << (z_cinfo + 7);
+
+            /* If it's interlaced, each block of 8 rows is sent as up to
+             * 14 rows, i.e., 6 additional rows, each with a filter byte
+             * and possibly a padding byte
+             */
+            if (png_ptr->interlaced)
+               uncompressed_idat_size += ((png_ptr->height + 7)/8) *
+                   (png_ptr->bit_depth < 8 ? 12 : 6);
+
+            z_cinfo = z_cmf >> 4;
+            half_z_window_size = 1 << (z_cinfo + 7);
+
             while (uncompressed_idat_size <= half_z_window_size &&
                 half_z_window_size >= 256)
             {
@@ -790,9 +1012,17 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
          png_error(png_ptr,
              "Invalid zlib compression method or flags in IDAT");
    }
+#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */
 
    png_write_chunk(png_ptr, png_IDAT, data, length);
    png_ptr->mode |= PNG_HAVE_IDAT;
+
+   /* Prior to 1.5.3 this code was replicated in every caller (except at the
+    * end, where it isn't technically necessary).  Since this function has
+    * flushed the data we can safely reset the zlib output buffer here.
+    */
+   png_ptr->zstream.next_out = png_ptr->zbuf;
+   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 }
 
 /* Write an IEND chunk */
@@ -918,7 +1148,10 @@ png_write_iCCP(png_structp png_ptr, png_const_charp name, int compression_type,
        (png_size_t)(name_len + 2));
 
    if (profile_len)
+   {
+      comp.input_len = profile_len;
       png_write_compressed_data_out(png_ptr, &comp);
+   }
 
    png_write_chunk_end(png_ptr);
    png_free(png_ptr, new_name);
@@ -1313,15 +1546,11 @@ png_check_keyword(png_structp png_ptr, png_const_charp key, png_charpp new_key)
       if ((png_byte)*ikp < 0x20 ||
          ((png_byte)*ikp > 0x7E && (png_byte)*ikp < 0xA1))
       {
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-         char msg[40];
+         PNG_WARNING_PARAMETERS(p)
 
-         png_snprintf(msg, 40,
-             "invalid keyword character 0x%02X", (png_byte)*ikp);
-         png_warning(png_ptr, msg);
-#else
-         png_warning(png_ptr, "invalid character in keyword");
-#endif
+         png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_02x,
+            *ikp);
+         png_formatted_warning(png_ptr, p, "invalid keyword character 0x@1");
          *dp = ' ';
       }
 
@@ -1499,6 +1728,7 @@ png_write_zTXt(png_structp png_ptr, png_const_charp key, png_const_charp text,
    png_write_chunk_data(png_ptr, &buf, (png_size_t)1);
 
    /* Write the compressed data */
+   comp.input_len = text_len;
    png_write_compressed_data_out(png_ptr, &comp);
 
    /* Close the chunk */
@@ -1871,6 +2101,7 @@ png_write_start_row(png_structp png_ptr)
       png_ptr->usr_width = png_ptr->width;
    }
 
+   png_zlib_claim(png_ptr, PNG_ZLIB_FOR_IDAT);
    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
    png_ptr->zstream.next_out = png_ptr->zbuf;
 }
@@ -1992,7 +2223,7 @@ png_write_finish_row(png_structp png_ptr)
           png_ptr->zstream.avail_out);
    }
 
-   deflateReset(&png_ptr->zstream);
+   png_zlib_release(png_ptr);
    png_ptr->zstream.data_type = Z_BINARY;
 }
 
@@ -2181,6 +2412,8 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
  * been specified by the application, and then writes the row out with the
  * chosen filter.
  */
+static void png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row);
+
 #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)
 #define PNG_HISHIFT 10
 #define PNG_LOMASK ((png_uint_32)0xffffL)
@@ -2856,7 +3089,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 
 
 /* Do the actual writing of a previously filtered row. */
-void /* PRIVATE */
+static void
 png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
 {
    png_size_t avail;
@@ -2916,8 +3149,6 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
       {
          /* Write the IDAT and reset the zlib output buffer */
          png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
-         png_ptr->zstream.next_out = png_ptr->zbuf;
-         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
       }
    /* Repeat until all data has been compressed */
    } while (avail > 0 || png_ptr->zstream.avail_in > 0);

projects/vstudio/readme.txt

@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.5.1beta01 - January 8, 2011
+libpng version 1.5.3beta05 - May 6, 2011
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 

projects/vstudio/zlib.props

@@ -2,9 +2,9 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.5.1beta01 - January 8, 2011
+ * libpng version 1.5.3beta05 - May 6, 2011
  *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -24,7 +24,11 @@
 	 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.
+	 If the version of zlib you use does not match that used when the
+	 distribution was built you will get warnings from pngtest that the zlib
+	 versions do not match.  The zlib version used in this build is recorded
+	 below:
      -->
-    <ZLibSrcDir>..\..\..\..\zlib-1.2.4</ZLibSrcDir>
+    <ZLibSrcDir>..\..\..\..\zlib-1.2.5</ZLibSrcDir>
   </PropertyGroup>
 </Project>

scripts/README.txt

@@ -1,9 +1,9 @@
 
-Makefiles for  libpng version 1.5.1beta01 - January 8, 2011
+Makefiles for  libpng version 1.5.3beta05 - May 6, 2011
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.1beta01)
+                       (gcc, creates libpng15.so.15.1.5.3beta05)
  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.prebuilt       =>  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.15.1.5.1beta01)
+                       (gcc, creates libpng15.so.15.1.5.3beta05)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@ pnglibconf.h.prebuilt       =>  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.15.1.5.1beta01)
+                       creates libpng15.so.15.1.5.3beta05)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.1beta01)
+                       creates libpng15.so.15.1.5.3beta05)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.1beta01)
+                       creates libpng15.so.15.1.5.3beta05)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile

scripts/libpng-config-head.in

@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.5.1beta01
+version=1.5.3beta05
 prefix=""
 libdir=""
 libs=""

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng15
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.5.1beta01
+Version: 1.5.3beta05
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}

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
 

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
 

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
 #

scripts/makefile.cegcc

@@ -23,7 +23,7 @@
 
 VERMAJ = 1
 VERMIN = 5
-VERMIC = 1
+VERMIC = 3
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)

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

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.

scripts/makefile.dj2

@@ -1,5 +1,5 @@
 # DJGPP (DOS gcc) makefile for libpng
-# Copyright (C) 2002, 2006, 2009-2010 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.

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
 #

scripts/makefile.hp64

@@ -1,5 +1,5 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002, 2006, 2009, 2010 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2009, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
 #

scripts/makefile.hpgcc

@@ -1,5 +1,5 @@
 # makefile for libpng on HP-UX using GCC with the HP ANSI/C linker.
-# Copyright (C) 2002, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 2001, Laurent faillie
 # Copyright (C) 1998, 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

scripts/makefile.hpux

@@ -1,5 +1,5 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
 #

scripts/makefile.linux

@@ -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 and
+# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010-2011 Greg Roelofs and
 # Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng15
 PNGMAJ = 15
-RELEASE = 1
+RELEASE = 3
 
 # Shared library names:
 LIBSO=$(LIBNAME).so

scripts/makefile.ne12bsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng15
 
 LIB=	png15
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.1beta01
+SHLIB_MINOR=	1.5.3beta05
 SRCS=	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

scripts/makefile.netbsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.1beta01
+SHLIB_MINOR=	1.5.3beta05
 SRCS=	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

scripts/makefile.openbsd

@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.1beta01
+SHLIB_MINOR=	1.5.3beta05
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \

scripts/makefile.sco

@@ -1,7 +1,7 @@
 # makefile for SCO OSr5  ELF and Unixware 7 with Native cc
 # Contributed by Mike Hopkirk (hops@sco.com) modified from Makefile.lnx
 #   force ELF build dynamic linking, SONAME setting in lib and RPATH in app
-# 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
 #

scripts/makefile.sggcc

@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so, SGI IRIX with 'cc'
-# Copyright (C) 2001-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2001-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.

scripts/makefile.sgi

@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so, SGI IRIX with 'cc'
-# Copyright (C) 2001-2002, 2006, 2007, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2001-2002, 2006, 2007, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.

scripts/makefile.so9

@@ -1,7 +1,7 @@
 # makefile for libpng on Solaris 9 (beta) with Forte cc
 # Updated by Chad Schrock for Solaris 9
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998-2001 Greg Roelofs
 # Copyright (C) 1996-1997 Andreas Dilger
 #

scripts/makefile.solaris

@@ -1,5 +1,5 @@
 # makefile for libpng on Solaris 2.x with gcc
-# Copyright (C) 2004, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2004, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

scripts/makefile.solaris-x86

@@ -1,5 +1,5 @@
 # makefile for libpng on Solaris 2.x with gcc
-# Copyright (C) 2004, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2004, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

scripts/makefile.vcwin32

@@ -1,6 +1,6 @@
 # makefile for libpng
 # Copyright (C) 1998 Tim Wegner
-# Copyright (C) 2006,2009 Glenn Randers-Pehrson
+# Copyright (C) 2006,2009,2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
@@ -15,7 +15,7 @@
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -nologo -MD -O2 -W3 -I..\zlib
+CFLAGS  = -nologo -D_CRT_SECURE_NO_DEPRECATE -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
@@ -36,8 +36,8 @@ OBJS  = $(OBJS1) $(OBJS2) $(OBJS3)
 all: libpng.lib
 
 # see scripts/pnglibconf.mak for more options
-pnglibconf.h: scripts/pnglibconf.h.prebuilt
-	cp scripts/pnglibconf.h.prebuilt $@
+pnglibconf.h: scripts\pnglibconf.h.prebuilt
+       copy scripts\pnglibconf.h.prebuilt $@
 
 png$(O): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)

scripts/options.awk

@@ -3,7 +3,7 @@
 #
 # last changed in libpng version 1.5.0 - January 6, 2011
 #
-# Copyright (c) 1998-2010 Glenn Randers-Pehrson
+# Copyright (c) 1998-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer

scripts/pnglibconf.dfa

@@ -6,9 +6,9 @@
 #
 com pnglibconf.h - library build configuration
 com
-com libpng version 1.5.0 - January 6, 2011
+com libpng version 1.5.3 -  (PENDING RELEASE)
 com
-com Copyright (c) 1998-2010 Glenn Randers-Pehrson
+com Copyright (c) 1998-2011 Glenn Randers-Pehrson
 com
 com This code is released under the libpng license.
 com For conditions of distribution and use, see the disclaimer
@@ -214,9 +214,9 @@ option STDIO
 option CONSOLE_IO requires STDIO
 
 # Note: prior to 1.5.0 this option could not be disabled if STDIO
-# was enabled.
+# was enabled.  Prior to 1.5.3 this option required STDIO
 
-option TIME_RFC1123 requires STDIO
+option TIME_RFC1123
 
 # PNG_SETJMP_NOT_SUPPORTED is an old equivalent for NO_SETJMP
 
@@ -304,6 +304,7 @@ option READ_TRANSFORMS requires READ
 = NO_READ_TRANSFORMS READ_TRANSFORMS_NOT_SUPPORTED
 
 option READ_EXPAND requires READ_TRANSFORMS
+option READ_EXPAND_16 requires READ_TRANSFORMS READ_16BIT enables READ_EXPAND
 option READ_SHIFT requires READ_TRANSFORMS
 option READ_PACK requires READ_TRANSFORMS
 option READ_BGR requires READ_TRANSFORMS
@@ -339,6 +340,10 @@ option READ_COMPOSITE_NODIV requires READ
 option INCH_CONVERSIONS
 = INCH_CONVERSIONS INCH_CONVERSIONS
 
+# API to build a grayscale palette
+
+option BUILD_GRAYSCALE_PALETTE
+
 # IN DEVELOPMENT
 # These are currently experimental features, define them if you want
 
@@ -380,8 +385,15 @@ option WRITE_WEIGHTED_FILTER requires WRITE
 
 option WRITE_FLUSH requires WRITE
 
-# Note: this can be turned off explicitly, is this correct?
+# Note: these can be turned off explicitly if not required by the
+# apps implementing the user transforms
 option USER_TRANSFORM_PTR if READ_USER_TRANSFORM WRITE_USER_TRANSFORM
+option USER_TRANSFORM_INFO if READ_USER_TRANSFORM WRITE_USER_TRANSFORM
+
+# This enables API to set compression parameters for compressing
+# non-IDAT chunks (zTXt, iTXt, iCCP, and unknown chunks).  This feature
+# was added at libpng-1.5.3.
+option WRITE_CUSTOMIZE_ZTXT_COMPRESSION requires WRITE
 
 # Any chunks you are not interested in, you can undef here.  The
 # ones that allocate memory may be expecially important (hIST,
@@ -498,7 +510,7 @@ chunk cHRM
 chunk gAMA
 chunk hIST
 chunk iCCP
-chunk iTXt requires TEXT
+chunk iTXt
 chunk oFFs
 chunk pCAL
 chunk sCAL
@@ -509,7 +521,7 @@ chunk sRGB
 chunk tEXt requires TEXT
 chunk tIME
 chunk tRNS
-chunk zTXt requires TEXT
+chunk zTXt
 
 # This only affects support of the optional PLTE chunk in RGB and RGBA
 # images.  Notice that READ_ANCILLARY_CHUNKS therefore disables part
@@ -538,9 +550,25 @@ option SAVE_INT_32 requires WRITE
 
 # png_save_int_32 is required by the ancillary chunks oFFs and pCAL
 
+# added at libpng-1.5.3
+option WRITE_OPTIMIZE_CMF requires WRITE
+
+option READ_COMPRESSED_TEXT disabled
+option READ_iCCP enables READ_COMPRESSED_TEXT
+option READ_iTXt enables READ_COMPRESSED_TEXT
+option READ_zTXt enables READ_COMPRESSED_TEXT
+option READ_COMPRESSED_TEXT enables READ_TEXT
+
 option WRITE_oFFs enables SAVE_INT_32
 option WRITE_pCAL enables SAVE_INT_32
 
+option WRITE_COMPRESSED_TEXT disabled
+option WRITE_iCCP enables WRITE_COMPRESSED_TEXT
+option WRITE_iTXt enables WRITE_COMPRESSED_TEXT
+option WRITE_zTXt enables WRITE_COMPRESSED_TEXT
+option WRITE_COMPRESSED_TEXT enables WRITE_TEXT
+
+
 # Turn this off to disable png_read_png() and png_write_png() and
 # leave the row_pointers member out of the info structure.
 

scripts/pnglibconf.h.prebuilt

@@ -3,173 +3,184 @@
 
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.5.0 - last changed on January 6, 2011 */
+/* libpng version 1.5.0 - last changed on February 11, 2011 */
 
-/* Copyright (c) 1998-2010 Glenn Randers-Pehrson */
+/* Copyright (c) 1998-2011 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 */
 
 /* pnglibconf.h */
-/* Machine generated file: DO NOT EDIT */
 /* Derived from: scripts/pnglibconf.dfa */
+/* If you edit this file by hand you must obey the rules expressed in */
+/* pnglibconf.dfa with respect to the dependencies between the following */
+/* symbols.  It is much better to generate a new file using */
+/* scripts/libpngconf.mak */
+  
 #ifndef PNGLCONF_H
 #define PNGLCONF_H
 /* settings */
-#define PNG_MAX_GAMMA_8 11
-#define PNG_CALLOC_SUPPORTED
-#define PNG_QUANTIZE_RED_BITS 5
-#define PNG_USER_WIDTH_MAX 1000000L
-#define PNG_QUANTIZE_GREEN_BITS 5
 #define PNG_API_RULE 0
-#define PNG_QUANTIZE_BLUE_BITS 5
-#define PNG_USER_CHUNK_CACHE_MAX 0
-#define PNG_USER_HEIGHT_MAX 1000000L
-#define PNG_sCAL_PRECISION 5
+#define PNG_CALLOC_SUPPORTED
 #define PNG_COST_SHIFT 3
-#define PNG_WEIGHT_SHIFT 8
-#define PNG_USER_CHUNK_MALLOC_MAX 0
 #define PNG_DEFAULT_READ_MACROS 1
-#define PNG_ZBUF_SIZE 8192
 #define PNG_GAMMA_THRESHOLD_FIXED 5000
+#define PNG_MAX_GAMMA_8 11
+#define PNG_QUANTIZE_BLUE_BITS 5
+#define PNG_QUANTIZE_GREEN_BITS 5
+#define PNG_QUANTIZE_RED_BITS 5
+#define PNG_sCAL_PRECISION 5
+#define PNG_USER_CHUNK_CACHE_MAX 0
+#define PNG_USER_CHUNK_MALLOC_MAX 0
+#define PNG_USER_HEIGHT_MAX 1000000L
+#define PNG_USER_WIDTH_MAX 1000000L
+#define PNG_WEIGHT_SHIFT 8
+#define PNG_ZBUF_SIZE 8192
 /* end of settings */
 /* options */
-#define PNG_INFO_IMAGE_SUPPORTED
-#define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#define PNG_POINTER_INDEXING_SUPPORTED
-#define PNG_WARNINGS_SUPPORTED
-#define PNG_FLOATING_ARITHMETIC_SUPPORTED
-#define PNG_WRITE_SUPPORTED
-#define PNG_WRITE_INTERLACING_SUPPORTED
-#define PNG_WRITE_16BIT_SUPPORTED
-#define PNG_EASY_ACCESS_SUPPORTED
-#define PNG_ALIGN_MEMORY_SUPPORTED
-#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-#define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_USER_LIMITS_SUPPORTED
-#define PNG_FIXED_POINT_SUPPORTED
-/*#undef PNG_ERROR_NUMBERS_SUPPORTED*/
-#define PNG_ERROR_TEXT_SUPPORTED
-#define PNG_READ_SUPPORTED
-/*#undef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED*/
-#define PNG_BENIGN_ERRORS_SUPPORTED
-#define PNG_SETJMP_SUPPORTED
-#define PNG_WRITE_FLUSH_SUPPORTED
-#define PNG_MNG_FEATURES_SUPPORTED
-#define PNG_FLOATING_POINT_SUPPORTED
-#define PNG_INCH_CONVERSIONS_SUPPORTED
-#define PNG_STDIO_SUPPORTED
-#define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_USER_MEM_SUPPORTED
-#define PNG_IO_STATE_SUPPORTED
-#define PNG_SET_USER_LIMITS_SUPPORTED
-#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
-#define PNG_WRITE_INT_FUNCTIONS_SUPPORTED
-#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
-#define PNG_WRITE_FILTER_SUPPORTED
-#define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
-#define PNG_WRITE_iCCP_SUPPORTED
-#define PNG_READ_TRANSFORMS_SUPPORTED
-#define PNG_READ_GAMMA_SUPPORTED
-#define PNG_READ_bKGD_SUPPORTED
-#define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_READ_sCAL_SUPPORTED
-#define PNG_WRITE_hIST_SUPPORTED
-#define PNG_READ_OPT_PLTE_SUPPORTED
-#define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
-#define PNG_WRITE_gAMA_SUPPORTED
-#define PNG_READ_GRAY_TO_RGB_SUPPORTED
-#define PNG_WRITE_pCAL_SUPPORTED
-#define PNG_READ_INVERT_ALPHA_SUPPORTED
-#define PNG_WRITE_TRANSFORMS_SUPPORTED
-#define PNG_READ_sBIT_SUPPORTED
-#define PNG_READ_PACK_SUPPORTED
-#define PNG_WRITE_SWAP_SUPPORTED
-#define PNG_READ_cHRM_SUPPORTED
-#define PNG_WRITE_tIME_SUPPORTED
-#define PNG_READ_INTERLACING_SUPPORTED
-#define PNG_READ_tRNS_SUPPORTED
-#define PNG_WRITE_pHYs_SUPPORTED
-#define PNG_WRITE_INVERT_SUPPORTED
-#define PNG_READ_RGB_TO_GRAY_SUPPORTED
-#define PNG_WRITE_sRGB_SUPPORTED
-#define PNG_READ_oFFs_SUPPORTED
-#define PNG_WRITE_FILLER_SUPPORTED
-#define PNG_WRITE_TEXT_SUPPORTED
-#define PNG_WRITE_SHIFT_SUPPORTED
-#define PNG_PROGRESSIVE_READ_SUPPORTED
-#define PNG_READ_SHIFT_SUPPORTED
-#define PNG_CONVERT_tIME_SUPPORTED
-#define PNG_READ_USER_TRANSFORM_SUPPORTED
-#define PNG_READ_INT_FUNCTIONS_SUPPORTED
-#define PNG_READ_USER_CHUNKS_SUPPORTED
-#define PNG_READ_hIST_SUPPORTED
-#define PNG_READ_16BIT_SUPPORTED
-#define PNG_READ_SWAP_ALPHA_SUPPORTED
-#define PNG_READ_COMPOSITE_NODIV_SUPPORTED
-#define PNG_SEQUENTIAL_READ_SUPPORTED
-#define PNG_READ_BACKGROUND_SUPPORTED
-#define PNG_READ_QUANTIZE_SUPPORTED
-#define PNG_READ_iCCP_SUPPORTED
-#define PNG_READ_STRIP_ALPHA_SUPPORTED
-#define PNG_READ_PACKSWAP_SUPPORTED
-#define PNG_READ_sRGB_SUPPORTED
-#define PNG_WRITE_tEXt_SUPPORTED
-#define PNG_READ_gAMA_SUPPORTED
-#define PNG_READ_pCAL_SUPPORTED
-#define PNG_READ_EXPAND_SUPPORTED
-#define PNG_WRITE_sPLT_SUPPORTED
-#define PNG_READ_SWAP_SUPPORTED
-#define PNG_READ_tIME_SUPPORTED
-#define PNG_READ_pHYs_SUPPORTED
-#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
-#define PNG_TIME_RFC1123_SUPPORTED
-#define PNG_READ_TEXT_SUPPORTED
-#define PNG_WRITE_BGR_SUPPORTED
-#define PNG_USER_CHUNKS_SUPPORTED
-#define PNG_CONSOLE_IO_SUPPORTED
-#define PNG_WRITE_PACK_SUPPORTED
-#define PNG_READ_FILLER_SUPPORTED
-#define PNG_WRITE_bKGD_SUPPORTED
-#define PNG_WRITE_tRNS_SUPPORTED
-#define PNG_READ_sPLT_SUPPORTED
-#define PNG_WRITE_sCAL_SUPPORTED
-#define PNG_WRITE_oFFs_SUPPORTED
-#define PNG_READ_tEXt_SUPPORTED
-#define PNG_WRITE_sBIT_SUPPORTED
-#define PNG_READ_INVERT_SUPPORTED
-#define PNG_READ_16_TO_8_SUPPORTED
-#define PNG_WRITE_cHRM_SUPPORTED
 #define PNG_16BIT_SUPPORTED
-#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
-#define PNG_READ_BGR_SUPPORTED
-#define PNG_WRITE_PACKSWAP_SUPPORTED
-#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
-#define PNG_sCAL_SUPPORTED
-#define PNG_WRITE_zTXt_SUPPORTED
-#define PNG_sBIT_SUPPORTED
-#define PNG_cHRM_SUPPORTED
+#define PNG_ALIGN_MEMORY_SUPPORTED
+#define PNG_BENIGN_ERRORS_SUPPORTED
 #define PNG_bKGD_SUPPORTED
-#define PNG_tRNS_SUPPORTED
-#define PNG_WRITE_iTXt_SUPPORTED
-#define PNG_oFFs_SUPPORTED
-#define PNG_USER_TRANSFORM_PTR_SUPPORTED
+#define PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
+#define PNG_CHECK_cHRM_SUPPORTED
+#define PNG_cHRM_SUPPORTED
+#define PNG_CONSOLE_IO_SUPPORTED
+#define PNG_CONVERT_tIME_SUPPORTED
+#define PNG_EASY_ACCESS_SUPPORTED
+#define PNG_ERROR_TEXT_SUPPORTED
+#define PNG_FIXED_POINT_SUPPORTED
+#define PNG_FLOATING_ARITHMETIC_SUPPORTED
+#define PNG_FLOATING_POINT_SUPPORTED
+#define PNG_gAMA_SUPPORTED
+#define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 #define PNG_hIST_SUPPORTED
 #define PNG_iCCP_SUPPORTED
-#define PNG_sRGB_SUPPORTED
-#define PNG_READ_zTXt_SUPPORTED
-#define PNG_gAMA_SUPPORTED
-#define PNG_pCAL_SUPPORTED
-#define PNG_CHECK_cHRM_SUPPORTED
-#define PNG_tIME_SUPPORTED
-#define PNG_pHYs_SUPPORTED
-#define PNG_READ_iTXt_SUPPORTED
-#define PNG_TEXT_SUPPORTED
-#define PNG_SAVE_INT_32_SUPPORTED
-#define PNG_sPLT_SUPPORTED
-#define PNG_tEXt_SUPPORTED
-#define PNG_zTXt_SUPPORTED
+#define PNG_INCH_CONVERSIONS_SUPPORTED
+#define PNG_INFO_IMAGE_SUPPORTED
+#define PNG_IO_STATE_SUPPORTED
 #define PNG_iTXt_SUPPORTED
+#define PNG_MNG_FEATURES_SUPPORTED
+#define PNG_oFFs_SUPPORTED
+#define PNG_pCAL_SUPPORTED
+#define PNG_pHYs_SUPPORTED
+#define PNG_POINTER_INDEXING_SUPPORTED
+#define PNG_PROGRESSIVE_READ_SUPPORTED
+#define PNG_READ_16BIT_SUPPORTED
+#define PNG_READ_16_TO_8_SUPPORTED
+#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+#define PNG_READ_BACKGROUND_SUPPORTED
+#define PNG_READ_BGR_SUPPORTED
+#define PNG_READ_bKGD_SUPPORTED
+#define PNG_READ_cHRM_SUPPORTED
+#define PNG_READ_COMPOSITE_NODIV_SUPPORTED
+#define PNG_READ_EXPAND_16_SUPPORTED
+#define PNG_READ_EXPAND_SUPPORTED
+#define PNG_READ_FILLER_SUPPORTED
+#define PNG_READ_gAMA_SUPPORTED
+#define PNG_READ_GAMMA_SUPPORTED
+#define PNG_READ_GRAY_TO_RGB_SUPPORTED
+#define PNG_READ_hIST_SUPPORTED
+#define PNG_READ_iCCP_SUPPORTED
+#define PNG_READ_INTERLACING_SUPPORTED
+#define PNG_READ_INT_FUNCTIONS_SUPPORTED
+#define PNG_READ_INVERT_ALPHA_SUPPORTED
+#define PNG_READ_INVERT_SUPPORTED
+#define PNG_READ_iTXt_SUPPORTED
+#define PNG_READ_oFFs_SUPPORTED
+#define PNG_READ_OPT_PLTE_SUPPORTED
+#define PNG_READ_PACK_SUPPORTED
+#define PNG_READ_PACKSWAP_SUPPORTED
+#define PNG_READ_pCAL_SUPPORTED
+#define PNG_READ_pHYs_SUPPORTED
+#define PNG_READ_QUANTIZE_SUPPORTED
+#define PNG_READ_RGB_TO_GRAY_SUPPORTED
+#define PNG_READ_sBIT_SUPPORTED
+#define PNG_READ_sCAL_SUPPORTED
+#define PNG_READ_SHIFT_SUPPORTED
+#define PNG_READ_sPLT_SUPPORTED
+#define PNG_READ_sRGB_SUPPORTED
+#define PNG_READ_STRIP_ALPHA_SUPPORTED
+#define PNG_READ_SUPPORTED
+#define PNG_READ_SWAP_ALPHA_SUPPORTED
+#define PNG_READ_SWAP_SUPPORTED
+#define PNG_READ_tEXt_SUPPORTED
+#define PNG_READ_TEXT_SUPPORTED
+#define PNG_READ_tIME_SUPPORTED
+#define PNG_READ_TRANSFORMS_SUPPORTED
+#define PNG_READ_tRNS_SUPPORTED
+#define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+#define PNG_READ_USER_CHUNKS_SUPPORTED
+#define PNG_READ_USER_TRANSFORM_SUPPORTED
+#define PNG_READ_zTXt_SUPPORTED
+#define PNG_READ_COMPRESSED_TEXT_SUPPORTED
+#define PNG_SAVE_INT_32_SUPPORTED
+#define PNG_sBIT_SUPPORTED
+#define PNG_sCAL_SUPPORTED
+#define PNG_SEQUENTIAL_READ_SUPPORTED
+#define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
+#define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
+#define PNG_SETJMP_SUPPORTED
+#define PNG_SET_USER_LIMITS_SUPPORTED
+#define PNG_sPLT_SUPPORTED
+#define PNG_sRGB_SUPPORTED
+#define PNG_STDIO_SUPPORTED
+#define PNG_tEXt_SUPPORTED
+#define PNG_TEXT_SUPPORTED
+#define PNG_TIME_RFC1123_SUPPORTED
+#define PNG_tIME_SUPPORTED
+#define PNG_tRNS_SUPPORTED
+#define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#define PNG_USER_CHUNKS_SUPPORTED
+#define PNG_USER_LIMITS_SUPPORTED
+#define PNG_USER_MEM_SUPPORTED
+#define PNG_USER_TRANSFORM_INFO_SUPPORTED
+#define PNG_USER_TRANSFORM_PTR_SUPPORTED
+#define PNG_WARNINGS_SUPPORTED
+#define PNG_WRITE_16BIT_SUPPORTED
+#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+#define PNG_WRITE_BGR_SUPPORTED
+#define PNG_WRITE_bKGD_SUPPORTED
+#define PNG_WRITE_cHRM_SUPPORTED
+#define PNG_WRITE_FILLER_SUPPORTED
+#define PNG_WRITE_FILTER_SUPPORTED
+#define PNG_WRITE_FLUSH_SUPPORTED
+#define PNG_WRITE_gAMA_SUPPORTED
+#define PNG_WRITE_hIST_SUPPORTED
+#define PNG_WRITE_iCCP_SUPPORTED
+#define PNG_WRITE_INTERLACING_SUPPORTED
+#define PNG_WRITE_INT_FUNCTIONS_SUPPORTED
+#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
+#define PNG_WRITE_INVERT_SUPPORTED
+#define PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
+#define PNG_WRITE_iTXt_SUPPORTED
+#define PNG_WRITE_oFFs_SUPPORTED
+#define PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
+#define PNG_WRITE_PACK_SUPPORTED
+#define PNG_WRITE_PACKSWAP_SUPPORTED
+#define PNG_WRITE_pCAL_SUPPORTED
+#define PNG_WRITE_pHYs_SUPPORTED
+#define PNG_WRITE_sBIT_SUPPORTED
+#define PNG_WRITE_sCAL_SUPPORTED
+#define PNG_WRITE_SHIFT_SUPPORTED
+#define PNG_WRITE_sPLT_SUPPORTED
+#define PNG_WRITE_sRGB_SUPPORTED
+#define PNG_WRITE_SUPPORTED
+#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
+#define PNG_WRITE_SWAP_SUPPORTED
+#define PNG_WRITE_tEXt_SUPPORTED
+#define PNG_WRITE_TEXT_SUPPORTED
+#define PNG_WRITE_tIME_SUPPORTED
+#define PNG_WRITE_TRANSFORMS_SUPPORTED
+#define PNG_WRITE_tRNS_SUPPORTED
+#define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#define PNG_WRITE_zTXt_SUPPORTED
+#define PNG_zTXt_SUPPORTED
+#define PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
+/*#undef PNG_ERROR_NUMBERS_SUPPORTED*/
+/*#undef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED*/
 /* end of options */
 #endif /* PNGLCONF_H */

scripts/pnglibconf.mak

@@ -12,8 +12,9 @@ AWK = mawk
 AWK = nawk
 AWK = one-true-awk
 AWK = awk  # Crashes on SunOS 5.10 - use 'nawk'
+CPP = $(CC) -E # Does not work on SUN OS 5.10 - use /lib/cpp
 SED = sed
-CPP = $(CC) -E
+
 COPY = cp
 DELETE = rm -f
 ECHO = echo
@@ -33,6 +34,7 @@ pnglibconf.h: pnglibconf.dfn
 	$(DELETE) $@ dfn.c dfn1.out dfn2.out dfn3.out
 	$(ECHO) '#include "pnglibconf.dfn"' >dfn.c
 	$(CPP) $(DFNFLAGS) dfn.c >dfn1.out
+	$(ECHO) "If 'cpp -e' crashes try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
 	$(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

scripts/sym.dfn

@@ -2,7 +2,7 @@
 /* sym.dfn - define format of libpng.sym
  *
  * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer

scripts/symbols.def

@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.5.1beta01
+;Version 1.5.3beta05
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3
@@ -221,3 +221,14 @@ EXPORTS
  png_set_sCAL_fixed @213
  png_get_sCAL_fixed @214
  png_set_background_fixed @215
+ png_get_io_chunk_type @216
+ png_get_current_row_number @217
+ png_get_current_pass_number @218
+ png_process_data_pause @219
+ png_process_data_skip @220
+ png_set_expand_16 @221
+ png_set_text_compression_level @222
+ png_set_text_compression_mem_level @223
+ png_set_text_compression_strategy @224
+ png_set_text_compression_window_bits @225
+ png_set_text_compression_method @226

scripts/symbols.dfn

@@ -2,7 +2,7 @@
 /* symbols.dfn - find all exported symbols
  *
  * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer

scripts/vers.dfn

@@ -2,7 +2,7 @@
 /* vers.dfn - define format of libpng.vers
  *
  * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer

test-pngvalid-full.sh

@@ -6,20 +6,14 @@ err=0
 echo >> pngtest-log.txt
 echo "============ pngvalid-full.sh ==============" >> pngtest-log.txt
 
-echo "Running test-pngvalid-full.sh -- it's lengthy, please wait..."
+echo "Running test-pngvalid-full.sh"
 for gamma in threshold transform sbit 16-to-8
 do
-   opts=
-   test "$gamma" = threshold || opts="$opts --nogamma-threshold"
-   test "$gamma" = transform || opts="$opts --nogamma-transform"
-   test "$gamma" = sbit      || opts="$opts --nogamma-sbit"
-   test "$gamma" = 16-to-8   || opts="$opts --nogamma-16-to-8"
-
-   if ./pngvalid --nostandard $opts >> pngtest-log.txt 2>&1
+   if ./pngvalid "--gamma-$gamma" >> pngtest-log.txt 2>&1
    then
-      echo "  PASS:" pngvalid "(gamma-$gamma)"
+      echo "  PASS:" pngvalid "--gamma-$gamma"
    else
-      echo "  FAIL:" pngvalid "(gamma-$gamma)"
+      echo "  FAIL:" pngvalid "--gamma-$gamma"
       err=1
    fi
 done

test-pngvalid-simple.sh

@@ -9,18 +9,20 @@ echo "============ pngvalid-simple.sh ==============" >> pngtest-log.txt
 echo "Running test-pngvalid-simple.sh"
 # The options to test are:
 #
-# --progressive-read, --interlace on the 'transform' images
-# --progressive-read on the 'size' images
+# standard tests with and without progressive reading and interlace
+# size images with and without progressive reading
+# transform tests (standard, non-interlaced only)
 #
-for opts in "" --progressive-read --interlace \
-   "--progressive-read --interlace" "--nostandard --size" \
-   "--nostandard --size --progressive-read"
+for opts in "--standard" "--standard --progressive-read" \
+   "--standard --interlace" "--standard --progressive-read --interlace" \
+   "--size" "--size --progressive-read" \
+   "--transform"
 do
-   if ./pngvalid  --nogamma $opts >> pngtest-log.txt 2>&1
+   if ./pngvalid  $opts >> pngtest-log.txt 2>&1
    then
-      echo "  PASS:" pngvalid --nogamma $opts
+      echo "  PASS:" pngvalid $opts
    else
-      echo "  FAIL:" pngvalid --nogamma $opts
+      echo "  FAIL:" pngvalid $opts
       err=1
    fi
 done