[libpng17] Imported from libpng-1.7.0beta04.tar

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta13 - May 13, 2013
+Libpng 1.7.0beta04 - February 27, 2013
 
 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.
@@ -9,19 +9,19 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.7.0beta13.tar.xz (LZMA-compressed, recommended)
-   1.7.0beta13.tar.gz
+   1.7.0beta04.tar.xz (LZMA-compressed, recommended)
+   1.7.0beta04.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp170b13.7z  (LZMA-compressed, recommended)
-   lp170b13.zip
+   lp170b04.7z  (LZMA-compressed, recommended)
+   lp170b04.zip
 
 Other information:
 
-   1.7.0beta13-README.txt
-   1.7.0beta13-LICENSE.txt
+   1.7.0beta04-README.txt
+   1.7.0beta04-LICENSE.txt
 
 Changes since the last public release (1.6.0):
 
@@ -189,121 +189,10 @@ Version 1.7.0beta03 [February 22, 2013]
 
 Version 1.7.0beta04 [February 27, 2013]
   Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
-  Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
+  Revised scripts/makefile.freebsd to respect ZLIBDIR and ZLIBINC.
   Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
     with CRLF line endings.
 
-Version 1.7.0beta05 [March 5, 2013]
-  Avoid a possible memory leak in contrib/gregbook/readpng.c
-  Changed user chunk callback API to respect global and per chunk defaults.
-    Previously a return of 0 from a user chunk callback would result in the
-    chunk being saved (if this was safe, even if the chunk was unsafe-to-copy);
-    this change respects the defaults set by the application, so unknown chunks
-    can be discarded by default and known-safe ones preserved.
-  Corrected Android builds and corrected libpng.vers with symbol
-    prefixing. This adds an API to set optimization options externally,
-    providing an alternative and general solution for the non-portable
-    run-time tests used by the ARM Neon code.  It also makes those tests
-    compile and link on Android.  The order of settings vs options in
-    pnglibconf.h is reversed to allow settings to depend on options and
-    options can now set (or override) the defaults for settings.
-
-Version 1.7.0beta06 [March 13, 2013]
-  Corrected simplified API default gamma for color-mapped output, added
-    a flag to change default. In 1.6.0 when the simplified API was used
-    to produce color-mapped output from an input image with no gamma
-    information the gamma assumed for the input could be different from
-    that assumed for non-color-mapped output.  In particular 16-bit depth
-    input files were assumed to be sRGB encoded, whereas in the 'direct'
-    case they were assumed to have linear data.  This was an error.  The
-    fix makes the simplified API treat all input files the same way and
-    adds a new flag to the png_image::flags member to allow the
-    application/user to specify that 16-bit files contain sRGB data
-    rather than the default linear.
-  Fixed bugs in the pngpixel and makepng test programs.
-  Fixed CMakelists.txt to allow building a single variant of the library
-    (Claudio Bley):
-  Introduced a PNG_LIB_TARGETS variable that lists all activated library
-    targets.  It is an error if this variable ends up empty, ie. you have
-    to build at least one library variant.
-  Made the *_COPY targets only depend on library targets actually being build.
-  Use PNG_LIB_TARGETS to unify a code path.
-  Changed the CREATE_SYMLINK macro to expect the full path to a file as the
-    first argument. When symlinking the filename component of that path is
-    determined and used as the link target.
-  Use copy_if_different in the CREATE_SYMLINK macro.
-  Eliminated two warnings from the Intel C compiler. The warnings are
-    technically valid, although a reasonable treatment of division would
-    show it to be incorrect.
-
-Version 1.7.0beta07 [April 14, 2013]
-  Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
-  Fixed incorrect warning of excess deflate data. End condition - the
-    warning would be produced if the end of the deflate stream wasn't read
-    in the last row.  The warning is harmless.
-  Corrected the test on user transform changes on read. It was in the
-    png_set of the transform function, but that doesn't matter unless the
-    transform function changes the rowbuf size, and that is only valid if
-    transform_info is called.
-  Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
-    (Flavio Medeiros).
-  Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
-
-Version 1.7.0beta08 [April 18, 2013]
-  Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
-    written by libpng-1.6.0 and 1.6.1.
-  Disallow storing sRGB information when the sRGB is not supported.
-
-Version 1.7.0beta09 [April 24, 2013]
-  Exposed PNG chunk types in png.h
-  Modified png_uint_32 macros/code to make as few assumptions as possible
-  Revised stack marking in arm/filter_neon.S and configure.ac
-  Ensure that NEON filter stuff is completely disabled when switched 'off'.
-    Previously the ARM NEON specific files were still built if the option
-    was switched 'off' as opposed to being explicitly disabled.
-
-Version 1.7.0beta10 [April 24, 2013]
-  Attempt to fix the PNG_ARM_NEON configuration mess.
-
-Version 1.7.0beta11 [April 26, 2013]
-  Test for 'arm*', not just 'arm' in the host_cpu configure variable.
-
-Version 1.7.0beta12 [April 30, 2013]
-  Added png_app_warning for out-of-range unknown chunk index in
-    png_set_unknown_chunk_location().
-  Expanded manual paragraph about writing private chunks.
-  Avoid dereferencing NULL pointer possibly returned from
-     png_create_write_struct() (Andrew Church).
-
-Version 1.7.0beta13 [May 13, 2013]
-  Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
-    right zlib header files.
-  Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
-  Updated contrib/pngminus/pnm2png.c (Paul Stewart):
-    Check for EOF
-    Ignore "#" delimited comments in input file to pnm2png.c.
-    Fixed whitespace handling
-    Added a call to png_set_packing()
-    Initialize dimension values so if sscanf fails at least we have known
-      invalid values.
-  Calculate our own zlib windowBits when decoding rather than trusting the
-    CMF bytes in the PNG datastream.
-  Added an option to force maximum window size for inflating, which was
-    the behavior of libpng15 and earlier.
-  Added png-fix-itxt and png-fix-too-far-back to the built programs and
-    removed warnings from the source code and timepng that are revealed as
-    a result.
-  Detect wrong libpng versions linked to png-fix-too-far-back, which currently
-    only works with libpng versions that can be made to reliably fail when
-    the deflate data contains an out-of-window reference.  This means only
-    1.6 and later.
-  Attempt to detect configuration issues with png-fix-too-far-back, which
-    requires both the correct libpng and the correct zlib to function
-    correctly.
-  Check ZLIB_VERNUM for mismatches, enclose #error in quotes
-  Added information in the documentation about problems with and fixes for
-    the bad CRC and bad iTXt chunk situations.
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement

CHANGES

@@ -4476,122 +4476,10 @@ Version 1.7.0beta03 [February 22, 2013]
 
 Version 1.7.0beta04 [February 27, 2013]
   Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
-  Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
+  Revised scripts/makefile.freebsd to respect ZLIBDIR and ZLIBINC.
   Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
     with CRLF line endings.
 
-Version 1.7.0beta05 [March 5, 2013]
-  Avoid a possible memory leak in contrib/gregbook/readpng.c
-  Changed user chunk callback API to respect global and per chunk defaults.
-    Previously a return of 0 from a user chunk callback would result in the
-    chunk being saved (if this was safe, even if the chunk was unsafe-to-copy);
-    this change respects the defaults set by the application, so unknown chunks
-    can be discarded by default and known-safe ones preserved.
-  Corrected Android builds and corrected libpng.vers with symbol
-    prefixing. This adds an API to set optimization options externally,
-    providing an alternative and general solution for the non-portable
-    run-time tests used by the ARM Neon code.  It also makes those tests
-    compile and link on Android.  The order of settings vs options in
-    pnglibconf.h is reversed to allow settings to depend on options and
-    options can now set (or override) the defaults for settings.
-
-Version 1.7.0beta06 [March 13, 2013]
-  Corrected simplified API default gamma for color-mapped output, added
-    a flag to change default. In 1.6.0 when the simplified API was used
-    to produce color-mapped output from an input image with no gamma
-    information the gamma assumed for the input could be different from
-    that assumed for non-color-mapped output.  In particular 16-bit depth
-    input files were assumed to be sRGB encoded, whereas in the 'direct'
-    case they were assumed to have linear data.  This was an error.  The
-    fix makes the simplified API treat all input files the same way and
-    adds a new flag to the png_image::flags member to allow the
-    application/user to specify that 16-bit files contain sRGB data
-    rather than the default linear.
-  Fixed bugs in the pngpixel and makepng test programs.
-  Fixed CMakelists.txt to allow building a single variant of the library
-    (Claudio Bley):
-  Introduced a PNG_LIB_TARGETS variable that lists all activated library
-    targets.  It is an error if this variable ends up empty, ie. you have
-    to build at least one library variant.
-  Made the *_COPY targets only depend on library targets actually being build.
-  Use PNG_LIB_TARGETS to unify a code path.
-  Changed the CREATE_SYMLINK macro to expect the full path to a file as the
-    first argument. When symlinking the filename component of that path is
-    determined and used as the link target.
-  Use copy_if_different in the CREATE_SYMLINK macro.
-  Eliminated two warnings from the Intel C compiler. The warnings are
-    technically valid, although a reasonable treatment of division would
-    show it to be incorrect.
-
-Version 1.7.0beta07 [April 14, 2013]
-  Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
-  Fixed incorrect warning of excess deflate data. End condition - the
-    warning would be produced if the end of the deflate stream wasn't read
-    in the last row.  The warning is harmless.
-  Corrected the test on user transform changes on read. It was in the
-    png_set of the transform function, but that doesn't matter unless the
-    transform function changes the rowbuf size, and that is only valid if
-    transform_info is called.
-  Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
-    (Flavio Medeiros).
-  Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
-
-Version 1.7.0beta08 [April 18, 2013]
-  Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
-    written by libpng-1.6.0 and 1.6.1.
-  Disallow storing sRGB information when the sRGB is not supported.
-
-Version 1.7.0beta09 [April 24, 2013]
-  Exposed PNG chunk types in png.h
-  Modified png_uint_32 macros/code to make as few assumptions as possible
-    about the hardware.
-  Revised stack marking in arm/filter_neon.S and configure.ac.
-  Ensure that NEON filter stuff is completely disabled when switched 'off'.
-    Previously the ARM NEON specific files were still built if the option
-    was switched 'off' as opposed to being explicitly disabled.
-
-Version 1.7.0beta10 [April 24, 2013]
-  Attempt to fix the PNG_ARM_NEON configuration mess.
-
-Version 1.7.0beta11 [April 26, 2013]
-  Test for 'arm*', not just 'arm' in the host_cpu configure variable.
-
-Version 1.7.0beta12 [April 30, 2013]
-  Added png_app_warning for out-of-range unknown chunk index in
-    png_set_unknown_chunk_location().
-  Expanded manual paragraph about writing private chunks.
-  Avoid dereferencing NULL pointer possibly returned from
-     png_create_write_struct() (Andrew Church).
-
-Version 1.7.0beta13 [May 13, 2013]
-  Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
-    right zlib header files.
-  Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
-  Updated contrib/pngminus/pnm2png.c (Paul Stewart):
-    Check for EOF
-    Ignore "#" delimited comments in input file to pnm2png.c.
-    Fixed whitespace handling
-    Added a call to png_set_packing()
-    Initialize dimension values so if sscanf fails at least we have known
-      invalid values.
-  Calculate our own zlib windowBits when decoding rather than trusting the
-    CMF bytes in the PNG datastream.
-  Added an option to force maximum window size for inflating, which was
-    the behavior of libpng15 and earlier.
-  Added png-fix-itxt and png-fix-too-far-back to the built programs and
-    removed warnings from the source code and timepng that are revealed as
-    a result.
-  Detect wrong libpng versions linked to png-fix-too-far-back, which currently
-    only works with libpng versions that can be made to reliably fail when
-    the deflate data contains an out-of-window reference.  This means only
-    1.6 and later.
-  Attempt to detect configuration issues with png-fix-too-far-back, which
-    requires both the correct libpng and the correct zlib to function
-    correctly.
-  Check ZLIB_VERNUM for mismatches, enclose #error in quotes
-  Added information in the documentation about problems with and fixes for
-    the bad CRC and bad iTXt chunk situations.
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement

CMakeLists.txt

@@ -139,11 +139,8 @@ endif()
 # NOW BUILD OUR TARGET
 include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
 
-unset(PNG_LIB_TARGETS)
-
 if(PNG_SHARED)
   add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
-  set(PNG_LIB_TARGETS ${PNG_LIB_NAME})
   if(MSVC)
     # msvc does not append 'lib' - do it here to have consistent name
     set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
@@ -156,7 +153,6 @@ if(PNG_STATIC)
 # does not work without changing name
   set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
   add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})
-  list(APPEND PNG_LIB_TARGETS ${PNG_LIB_NAME_STATIC})
   if(MSVC)
     # msvc does not append 'lib' - do it here to have consistent name
     set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
@@ -164,12 +160,6 @@ if(PNG_STATIC)
   target_link_libraries(${PNG_LIB_NAME_STATIC} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
 
-if(NOT PNG_LIB_TARGETS)
-  message(SEND_ERROR
-    "No library variant selected to build. "
-    "Please enable at least one of the following options: PNG_STATIC, PNG_SHARED")
-endif()
-
 if(PNG_SHARED AND WIN32)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
 endif()
@@ -232,15 +222,14 @@ macro(CREATE_SYMLINK SRC_FILE DEST_FILE)
   if(WIN32 AND NOT CYGWIN AND NOT MSYS)
     ADD_CUSTOM_COMMAND(
         OUTPUT ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}   ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
-        COMMAND ${CMAKE_COMMAND} -E copy_if_different  "${SRC_FILE}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}
-        COMMAND ${CMAKE_COMMAND} -E copy_if_different  "${SRC_FILE}" ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
-        DEPENDS ${PNG_LIB_TARGETS}
+        COMMAND ${CMAKE_COMMAND} -E copy        ${CMAKE_CURRENT_BINARY_DIR}/${SRC_FILE} ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}
+        COMMAND ${CMAKE_COMMAND} -E copy        ${CMAKE_CURRENT_BINARY_DIR}/${SRC_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
+        DEPENDS ${PNG_LIB_NAME} ${PNG_LIB_NAME_STATIC}
         )
     ADD_CUSTOM_TARGET(${DEST_FILE}_COPY ALL DEPENDS ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
   else(WIN32 AND NOT CYGWIN AND NOT MSYS)
-    get_filename_component(LINK_TARGET "${SRC_FILE}" NAME)
-    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${SRC_FILE} ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${SRC_FILE} ${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
   endif(WIN32 AND NOT CYGWIN AND NOT MSYS)
 endmacro()
 
@@ -271,7 +260,7 @@ endif(NOT WIN32 OR CYGWIN OR MINGW)
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 17.${PNGLIB_RELEASE}.1.7.0beta13
+#   VERSION 17.${PNGLIB_RELEASE}.1.7.0beta04
     VERSION 17.${PNGLIB_RELEASE}.0
     SOVERSION 17
     CLEAN_DIRECT_OUTPUT 1)
@@ -298,33 +287,40 @@ endif()
 
 # INSTALL
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
-  install(TARGETS ${PNG_LIB_TARGETS}
-      ${PNG_EXPORT_RULE}
-      RUNTIME DESTINATION bin
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-
   if(PNG_SHARED)
+    install(TARGETS ${PNG_LIB_NAME}
+        ${PNG_EXPORT_RULE}
+        RUNTIME DESTINATION bin
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
     # Create a symlink for libpng.dll.a => libpng17.dll.a on Cygwin
     if(CYGWIN OR MINGW)
        get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
-       CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
+       get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+       CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
          DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif(CYGWIN OR MINGW)
 
     if(NOT WIN32)
       get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
-      CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
+      get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+      CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
          DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif(NOT WIN32)
   endif(PNG_SHARED)
 
   if(PNG_STATIC)
+    install(TARGETS ${PNG_LIB_NAME_STATIC}
+        ${PNG_EXPORT_RULE}
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     if(NOT WIN32 OR CYGWIN OR MINGW)
       get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME_STATIC} LOCATION_${CMAKE_BUILD_TYPE})
-      CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
+      get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+      CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
          DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif(NOT WIN32 OR CYGWIN OR MINGW)

LICENSE

@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.7.0beta13, May 13, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.7.0beta04, February 27, 2013, are
 Copyright (c) 2004, 2006-2013 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
-May 13, 2013
+February 27, 2013

Makefile.am

@@ -9,9 +9,6 @@ ACLOCAL_AMFLAGS = -I scripts
 # test programs - run on make check, make distcheck
 check_PROGRAMS= pngtest pngunknown pngstest pngvalid
 
-# Utilities - installed
-bin_PROGRAMS= png-fix-too-far-back png-fix-itxt
-
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
@@ -24,11 +21,6 @@ pngstest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 pngunknown_SOURCES = contrib/libtests/pngunknown.c
 pngunknown_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
-png_fix_too_far_back_SOURCES = contrib/tools/png-fix-too-far-back.c
-png_fix_too_far_back_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-
-png_fix_itxt_SOURCES = contrib/tools/png-fix-itxt.c
-
 # Generally these are single line shell scripts to run a test with a particular
 # set of parameters:
 TESTS =\
@@ -190,15 +182,14 @@ endif
 $(srcdir)/scripts/pnglibconf.h.prebuilt:
 	@echo "Attempting to build $@" >&2
 	@echo "This is a machine generated file, but if you want to make" >&2
-	@echo "a new one simply make 'scripts/pnglibconf.out', copy that" >&2
-	@echo "AND set PNG_ZLIB_VERNUM to 0 (you MUST do this)" >&2
+	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1
 
 # The following is necessary to ensure that the local pnglibconf.h is used, not
 # an installed one (this can happen immediately after on a clean system if
 # 'make test' is the first thing the user does.)
-pngstest.o pngvalid.o pngtest.o pngunknown.o timepng.o: pnglibconf.h
-png-fix-too-far-back.o png-fix-itxt.o: pnglibconf.h
+contrib/libtests/pngstest.o contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h
+contrib/libtests/pngunknown.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 prevents the read macros from

README

@@ -1,4 +1,4 @@
-README for libpng version 1.7.0beta13 - May 13, 2013 (shared library 17.0)
+README for libpng version 1.7.0beta04 - February 27, 2013 (shared library 17.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.

arm/arm_init.c

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2013 Glenn Randers-Pehrson
  * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.5.16 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.15 [%RDATE%]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -16,7 +16,16 @@
 
 #include "../pngpriv.h"
 
-#ifdef PNG_ARM_NEON_SUPPORTED
+#if defined(PNG_FILTER_OPTIMIZATIONS) && defined(__arm__) && \
+   defined(__ARM_NEON__)
+/* __arm__ is defined by GCC, MSVC defines _M_ARM to the ARM version number,
+ * Andoid intends to define __ANDROID__, however there are bugs in their
+ * toolchain; use -D__ANDROID__ to work round this.
+ *
+ * __ARM_NEON__ is used to ensure that the compiler has the appropriate ARM
+ * NEON support
+ */
+
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
 #include <signal.h> /* for sig_atomic_t */
 
@@ -36,8 +45,7 @@ png_have_neon(png_structp png_ptr)
     * implemented as below, therefore it is better to cache the result (these
     * function calls may be slow!)
     */
-   PNG_UNUSED(png_ptr)
-   return android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
+   return andoid_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
       (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
 }
 #elif defined(__linux__)
@@ -153,39 +161,15 @@ png_have_neon(png_structp png_ptr)
 void
 png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
 {
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-   switch ((pp->options >> PNG_ARM_NEON) & 3)
-   {
-      case PNG_OPTION_UNSET:
-         /* Allow the run-time check to execute if it has been enabled -
-          * thus both API and CHECK can be turned on.  If it isn't supported
-          * this case will fall through to the 'default' below, which just
-          * returns.
-          */
-#endif /* PNG_ARM_NEON_API_SUPPORTED */
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED
-         {
-            static volatile sig_atomic_t no_neon = -1; /* not checked */
+   static volatile sig_atomic_t no_neon = -1; /* not checked */
 
-            if (no_neon < 0)
-               no_neon = !png_have_neon(pp);
+   if (no_neon < 0)
+      no_neon = !png_have_neon(pp);
 
-            if (no_neon)
-               return;
-         }
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-         break;
-#endif
+   if (no_neon)
+      return;
 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-      case PNG_OPTION_ON:
-         /* Option turned on */
-         break;
-
-      default: /* OFF or INVALID */
-         return;
-   }
-#endif
 
    /* IMPORTANT: any new external functions used here must be declared using
     * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
@@ -216,4 +200,4 @@ png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
           png_read_filter_row_paeth4_neon;
    }
 }
-#endif /* PNG_ARM_NEON_SUPPORTED */
+#endif /* FILTER_OPTIMIZATIONS && __arm__ && __ARM_NEON__ */

arm/filter_neon.S

@@ -1,9 +1,9 @@
 
 /* filter_neon.S - NEON optimised filter functions
  *
- * Copyright (c) 2013 Glenn Randers-Pehrson
+ * Copyright (c) 2011 Glenn Randers-Pehrson
  * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.5.16 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [December 15, 2011]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -11,17 +11,17 @@
  */
 
 /* This is required to get the symbol renames, which are #defines, and also
- * includes the definition (or not) of PNG_ARM_NEON_SUPPORTED.
+ * includes the value of PNG_FILTER_OPTIMIZATIONS.
  */
 #define PNG_VERSION_INFO_ONLY
 #include "../pngpriv.h"
 
+#if defined(PNG_FILTER_OPTIMIZATIONS) && defined(__arm__) && \
+   defined(__ARM_NEON__)
 #if defined(__linux__) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
 #endif
 
-#ifdef PNG_ARM_NEON_SUPPORTED
-
 #ifdef __ELF__
 #   define ELF
 #else
@@ -232,4 +232,4 @@ func    png_read_filter_row_paeth3_neon, export=1
 
         pop             {r4,pc}
 endfunc
-#endif /* PNG_ARM_NEON_SUPPORTED */
+#endif /* FILTER_OPTIMIZATIONS && __arm__ && __ARM_NEON__ */

configure.ac

@@ -18,7 +18,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.7.0beta13],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.7.0beta04],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -39,7 +39,7 @@ dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.7.0beta13
+PNGLIB_VERSION=1.7.0beta04
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=7
 PNGLIB_RELEASE=0
@@ -334,50 +334,26 @@ AC_ARG_WITH(libpng-prefix,
     fi])
 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
 
-# HOST SPECIFIC OPTIONS
-# =====================
-#
-# ARM
-# ===
-#
-# ARM NEON (SIMD) support.
+# Because GCC by default assembles code with an executable stack, even though it
+# compiles C code with a non-executable stack, it is necessary to do a fixup
+# here (this may by GCC specific)
+AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])
 
 AC_ARG_ENABLE([arm-neon],
    AS_HELP_STRING([[[--enable-arm-neon]]],
-      [Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
-      [no/off: disable the optimizations; check: use internal checking code]
-      [(deprecated and poorly supported); api: disable by default, enable by]
-      [a call to png_set_option; yes/on: turn on unconditionally.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __ARM_NEON__ systems:
-         AC_DEFINE([PNG_NO_ARM_NEON], [],
-                   [Disable ARM Neon optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_arm_neon=no;;
-      check)
-         AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
-                   [Check for ARM Neon support at run-time]);;
-      api)
-         AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
-                   [Turn on ARM Neon optimizations at run-time]);;
-      yes|on)
-         AC_DEFINE([PNG_ARM_NEON_SUPPORTED], [],
-                   [Enable ARM Neon optimizations]);;
-      *)
-         AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value])
-   esac])
-
-# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or
-# where ARM optimizations were explicitly requested (this allows a fallback if a
-# future host CPU does not match 'arm*')
-
-AM_CONDITIONAL([PNG_ARM_NEON],
-   [test "$enable_arm_neon" != 'no' &&
-    case "$host_cpu" in
-      arm*) :;;
-      *)    test "$enable_arm_neon" != '';;
-    esac])
+      [Enable ARM NEON optimizations: use 'always' to turn off run-time checks]),
+   [if test "${enableval}" = "yes" -o "${enableval}" = "always"; then
+      AC_DEFINE([PNG_FILTER_OPTIMIZATIONS],
+                [png_init_filter_functions_neon],
+                [ARM NEON filter initialization function])
+      AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [],
+                [Align row buffers])
+      if test "${enableval}" = "always"; then
+         AC_DEFINE([PNG_NO_ARM_NEON_CHECK], [],
+                   [Turn off run-time checking for ARM NEON support])
+      fi
+    fi])
+AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" != "no"])
 
 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
 

contrib/examples/pngpixel.c

@@ -37,7 +37,7 @@ component(png_const_bytep row, png_uint_32 x, unsigned int c,
     * bytes wide.  Since the row fitted into memory, however, the following must
     * work:
     */
-   png_uint_32 bit_offset_hi = bit_depth * ((x >> 6) * channels);
+   png_uint_32 bit_offset_hi = bit_depth * ((x >> 6) * channels + c);
    png_uint_32 bit_offset_lo = bit_depth * ((x & 0x3f) * channels + c);
 
    row = (png_const_bytep)(((PNG_CONST png_byte (*)[8])row) + bit_offset_hi);

contrib/gregbook/readpng.c

@@ -215,10 +215,6 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
      * libpng function */
 
     if (setjmp(png_jmpbuf(png_ptr))) {
-        free(image_data);
-        image_data = NULL;
-        free(row_pointers);
-        row_pointers = NULL;
         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
         return NULL;
     }

contrib/libtests/makepng.c

@@ -440,7 +440,7 @@ generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type,
       /* Palette with fixed color: the image rows are all 0 and the image width
        * is 16.
        */
-      memset(row, 0, rowbytes);
+      memset(row, rowbytes, 0);
    }
 
    else if (colors[0] == channels_of_type(color_type))
@@ -624,8 +624,8 @@ write_png(const char **name, FILE *fp, int color_type, int bit_depth,
 
             gamma_table[0] = 0;
 
-            for (i=1; i<255; ++i)
-               gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + .5);
+            for (i=0; i<255; ++i)
+               gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + 127.5);
 
             gamma_table[255] = 255;
          }

contrib/libtests/pngstest.c

@@ -315,7 +315,6 @@ compare_16bit(int v1, int v2, int error_limit, int multiple_algorithms)
 #define KEEP_GOING 32
 #define ACCUMULATE 64
 #define FAST_WRITE 128
-#define sRGB_16BIT 256
 
 static void
 print_opts(png_uint_32 opts)
@@ -336,8 +335,6 @@ print_opts(png_uint_32 opts)
       printf(" --accumulate");
    if (!(opts & FAST_WRITE)) /* --fast is currently the default */
       printf(" --slow");
-   if (opts & sRGB_16BIT)
-      printf(" --sRGB-16bit");
 }
 
 #define FORMAT_NO_CHANGE 0x80000000 /* additional flag */
@@ -3029,10 +3026,6 @@ read_file(Image *image, png_uint_32 format, png_const_colorp background)
          return logerror(image, "file init: ", image->file_name, "");
    }
 
-   /* This must be set after the begin_read call: */
-   if (image->opts & sRGB_16BIT)
-      image->image.flags |= PNG_IMAGE_FLAG_16BIT_sRGB;
-
    /* Have an initialized image with all the data we need plus, maybe, an
     * allocated file (myfile) or buffer (mybuffer) that need to be freed.
     */
@@ -3495,10 +3488,6 @@ main(int argc, char **argv)
          opts &= ~KEEP_GOING;
       else if (strcmp(arg, "--strict") == 0)
          opts |= STRICT;
-      else if (strcmp(arg, "--sRGB-16bit") == 0)
-         opts |= sRGB_16BIT;
-      else if (strcmp(arg, "--linear-16bit") == 0)
-         opts &= ~sRGB_16BIT;
       else if (strcmp(arg, "--tmpfile") == 0)
       {
          if (c+1 < argc)

contrib/libtests/pngunknown.c

@@ -75,8 +75,42 @@ typedef png_byte *png_const_bytep;
 #  define png_const_structp png_structp
 #endif
 
-/* Types of chunks not know to libpng */
-#define png_vpAg PNG_U32(118, 112, 65, 103)
+
+/* Copied from pngpriv.h */
+#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
+#define PNG_CHUNK(b1,b2,b3,b4) \
+   (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
+
+#define png_IHDR PNG_CHUNK( 73,  72,  68,  82)
+#define png_IDAT PNG_CHUNK( 73,  68,  65,  84)
+#define png_IEND PNG_CHUNK( 73,  69,  78,  68)
+#define png_PLTE PNG_CHUNK( 80,  76,  84,  69)
+#define png_bKGD PNG_CHUNK( 98,  75,  71,  68)
+#define png_cHRM PNG_CHUNK( 99,  72,  82,  77)
+#define png_gAMA PNG_CHUNK(103,  65,  77,  65)
+#define png_hIST PNG_CHUNK(104,  73,  83,  84)
+#define png_iCCP PNG_CHUNK(105,  67,  67,  80)
+#define png_iTXt PNG_CHUNK(105,  84,  88, 116)
+#define png_oFFs PNG_CHUNK(111,  70,  70, 115)
+#define png_pCAL PNG_CHUNK(112,  67,  65,  76)
+#define png_sCAL PNG_CHUNK(115,  67,  65,  76)
+#define png_pHYs PNG_CHUNK(112,  72,  89, 115)
+#define png_sBIT PNG_CHUNK(115,  66,  73,  84)
+#define png_sPLT PNG_CHUNK(115,  80,  76,  84)
+#define png_sRGB PNG_CHUNK(115,  82,  71,  66)
+#define png_sTER PNG_CHUNK(115,  84,  69,  82)
+#define png_tEXt PNG_CHUNK(116,  69,  88, 116)
+#define png_tIME PNG_CHUNK(116,  73,  77,  69)
+#define png_tRNS PNG_CHUNK(116,  82,  78,  83)
+#define png_zTXt PNG_CHUNK(122,  84,  88, 116)
+#define png_vpAg PNG_CHUNK('v', 'p', 'A', 'g')
+
+/* Test on flag values as defined in the spec (section 5.4): */
+#define PNG_CHUNK_ANCILLARY(c )   (1 & ((c) >> 29))
+#define PNG_CHUNK_CRITICAL(c)     (!PNG_CHUNK_ANCILLARY(c))
+#define PNG_CHUNK_PRIVATE(c)      (1 & ((c) >> 21))
+#define PNG_CHUNK_RESERVED(c)     (1 & ((c) >> 13))
+#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >>  5))
 
 /* Chunk information */
 #define PNG_INFO_tEXt 0x10000000U
@@ -105,128 +139,23 @@ static struct
    { "PLTE", PNG_INFO_PLTE, png_PLTE, 0, 0, ABSENT, 0 },
 
    /* Non-critical chunks that libpng handles */
-   /* This is a mess but it seems to be the only way to do it - there is no way to
-    * check for definition outside a #if.
-    */
-   { "bKGD", PNG_INFO_bKGD, png_bKGD,
-#     ifdef PNG_READ_bKGD_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "cHRM", PNG_INFO_cHRM, png_cHRM,
-#     ifdef PNG_READ_cHRM_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "gAMA", PNG_INFO_gAMA, png_gAMA,
-#     ifdef PNG_READ_gAMA_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "hIST", PNG_INFO_hIST, png_hIST,
-#     ifdef PNG_READ_hIST_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1, ABSENT, 0 },
-   { "iCCP", PNG_INFO_iCCP, png_iCCP,
-#     ifdef PNG_READ_iCCP_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1, ABSENT, 0 },
-   { "iTXt", PNG_INFO_iTXt, png_iTXt,
-#     ifdef PNG_READ_iTXt_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1, ABSENT, 0 },
-   { "oFFs", PNG_INFO_oFFs, png_oFFs,
-#     ifdef PNG_READ_oFFs_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "pCAL", PNG_INFO_pCAL, png_pCAL,
-#     ifdef PNG_READ_pCAL_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "pHYs", PNG_INFO_pHYs, png_pHYs,
-#     ifdef PNG_READ_pHYs_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "sBIT", PNG_INFO_sBIT, png_sBIT,
-#     ifdef PNG_READ_sBIT_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "sCAL", PNG_INFO_sCAL, png_sCAL,
-#     ifdef PNG_READ_sCAL_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "sPLT", PNG_INFO_sPLT, png_sPLT,
-#     ifdef PNG_READ_sPLT_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1, ABSENT, 0 },
-   { "sRGB", PNG_INFO_sRGB, png_sRGB,
-#     ifdef PNG_READ_sRGB_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "tEXt", PNG_INFO_tEXt, png_tEXt,
-#     ifdef PNG_READ_tEXt_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "tIME", PNG_INFO_tIME, png_tIME,
-#     ifdef PNG_READ_tIME_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,  START, 0 },
-   { "tRNS", PNG_INFO_tRNS, png_tRNS,
-#     ifdef PNG_READ_tRNS_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      0, ABSENT, 0 },
-   { "zTXt", PNG_INFO_zTXt, png_zTXt,
-#     ifdef PNG_READ_zTXt_SUPPORTED
-         0,
-#     else
-         1,
-#     endif
-      1,    END, 0 },
+   { "bKGD", PNG_INFO_bKGD, png_bKGD, 0, 1,  START, 0 },
+   { "cHRM", PNG_INFO_cHRM, png_cHRM, 0, 1,  START, 0 },
+   { "gAMA", PNG_INFO_gAMA, png_gAMA, 0, 1,  START, 0 },
+   { "hIST", PNG_INFO_hIST, png_hIST, 0, 1, ABSENT, 0 },
+   { "iCCP", PNG_INFO_iCCP, png_iCCP, 0, 1, ABSENT, 0 },
+   { "iTXt", PNG_INFO_iTXt, png_iTXt, 0, 1, ABSENT, 0 },
+   { "oFFs", PNG_INFO_oFFs, png_oFFs, 0, 1,  START, 0 },
+   { "pCAL", PNG_INFO_pCAL, png_pCAL, 0, 1,  START, 0 },
+   { "pHYs", PNG_INFO_pHYs, png_pHYs, 0, 1,  START, 0 },
+   { "sBIT", PNG_INFO_sBIT, png_sBIT, 0, 1,  START, 0 },
+   { "sCAL", PNG_INFO_sCAL, png_sCAL, 0, 1,  START, 0 },
+   { "sPLT", PNG_INFO_sPLT, png_sPLT, 0, 1, ABSENT, 0 },
+   { "sRGB", PNG_INFO_sRGB, png_sRGB, 0, 1,  START, 0 },
+   { "tEXt", PNG_INFO_tEXt, png_tEXt, 0, 1,  START, 0 },
+   { "tIME", PNG_INFO_tIME, png_tIME, 0, 1,  START, 0 },
+   { "tRNS", PNG_INFO_tRNS, png_tRNS, 0, 0, ABSENT, 0 },
+   { "zTXt", PNG_INFO_zTXt, png_zTXt, 0, 1,    END, 0 },
 
    /* No libpng handling */
    { "sTER", PNG_INFO_sTER, png_sTER, 1, 1,  START, 0 },
@@ -283,13 +212,13 @@ find_by_flag(png_uint_32 flag)
 static int
 ancillary(const char *name)
 {
-   return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
+   return PNG_CHUNK_ANCILLARY(PNG_CHUNK(name[0], name[1], name[2], name[3]));
 }
 
 static int
 ancillaryb(const png_byte *name)
 {
-   return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
+   return PNG_CHUNK_ANCILLARY(PNG_CHUNK(name[0], name[1], name[2], name[3]));
 }
 
 /* Type of an error_ptr */
@@ -1026,7 +955,6 @@ main(void)
 {
    fprintf(stderr,
    " test ignored because libpng was not built with unknown chunk support\n");
-   /* So the test is skipped: */
-   return 77;
+   return 0;
 }
 #endif

contrib/libtests/pngvalid.c

@@ -4617,13 +4617,9 @@ progressive_row(png_structp ppIn, png_bytep new_row, png_uint_32 y, int pass)
       }
       else
          png_progressive_combine_row(pp, row, new_row);
-#endif /* PNG_READ_INTERLACING_SUPPORTED */
-   }
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   else if (dp->interlace_type == PNG_INTERLACE_ADAM7 &&
-       PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
-       PNG_PASS_COLS(dp->w, pass) > 0)
+   } else if (dp->interlace_type == PNG_INTERLACE_ADAM7 &&
+      PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
+      PNG_PASS_COLS(dp->w, pass) > 0)
       png_error(pp, "missing row in progressive de-interlacing");
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
 }
@@ -10351,7 +10347,6 @@ int main(int argc, char **argv)
 int main(void)
 {
    fprintf(stderr, "pngvalid: no write support in libpng, all tests skipped\n");
-   /* So the test is skipped: */
-   return 77;
+   return 0;
 }
 #endif

contrib/pngminim/decoder/makefile

@@ -14,8 +14,7 @@ LD=$(CC)
 RM=rm -f
 COPY=cp
 
-CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
-CFLAGS=-O1
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP -I. -O1
 
 C=.c
 O=.o
@@ -82,7 +81,7 @@ OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 
 # note: dependencies do not work on implicit rule lines
 .c$(O):
-	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 
 # dependencies
 
@@ -96,12 +95,12 @@ pngm2pnm$(E): $(OBJS)
 # The CPP_FLAGS setting causes pngusr.h to be included in
 # both the build of pnglibconf.h and, subsequently, when
 # building libpng itself.
-$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
 	$(PNGSRC)/scripts/pnglibconf.dfa \
 	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
 	$(RM) pnglibconf.h pnglibconf.dfn
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
-	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
 	    DFA_XTRA="pngusr.dfa" $@
 
 clean:

contrib/pngminim/encoder/makefile

@@ -14,8 +14,7 @@ LD=$(CC)
 RM=rm -f
 COPY=cp
 
-CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
-CFLAGS=-O1
+CFLAGS=-DPNG_USER_CONFIG -DZ_SOLO -DNO_GZIP -I. -O1
 
 C=.c
 O=.o
@@ -81,7 +80,7 @@ OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 # implicit make rules -------------------------------------------------------
 
 .c$(O):
-	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 
 # dependencies
 
@@ -95,12 +94,12 @@ pnm2pngm$(E): $(OBJS)
 # The CPP_FLAGS setting causes pngusr.h to be included in
 # both the build of pnglibconf.h and, subsequently, when
 # building libpng itself.
-$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
 	$(PNGSRC)/scripts/pnglibconf.dfa \
 	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
 	$(RM) pnglibconf.h pnglibconf.dfn
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
-	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
 	    DFA_XTRA="pngusr.dfa" $@
 
 clean:

contrib/pngminim/preader/makefile

@@ -30,8 +30,7 @@ XLIB = -L/usr/X11R6/lib -lX11
 #LIBS = $(XLIB)
 LIBS = $(XLIB) -lm                      #platforms that need libm
 
-CPPFLAGS=-I. $(XINC) -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
-CFLAGS=-O1
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP -I. $(XINC) -O1
 
 C=.c
 O=.o
@@ -97,7 +96,7 @@ OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 # implicit make rules -------------------------------------------------------
 
 .c$(O):
-	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 
 # dependencies
 
@@ -111,12 +110,12 @@ rpng2-x$(E): $(OBJS)
 # The CPP_FLAGS setting causes pngusr.h to be included in
 # both the build of pnglibconf.h and, subsequently, when
 # building libpng itself.
-$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
 	$(PNGSRC)/scripts/pnglibconf.dfa \
 	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
 	$(RM) pnglibconf.h pnglibconf.dfn
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
-	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
 	    DFA_XTRA="pngusr.dfa" $@
 
 clean:

contrib/pngminus/pnm2png.c

@@ -198,9 +198,9 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
   char          height_token[16];
   char          maxval_token[16];
   int           color_type;
-  unsigned long   ul_width=0, ul_alpha_width=0;
-  unsigned long   ul_height=0, ul_alpha_height=0;
-  unsigned long   ul_maxval=0;
+  unsigned long   ul_width, ul_alpha_width;
+  unsigned long   ul_height, ul_alpha_height;
+  unsigned long   ul_maxval;
   png_uint_32   width, alpha_width;
   png_uint_32   height, alpha_height;
   png_uint_32   maxval;
@@ -210,9 +210,6 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
   int           alpha_present;
   int           row, col;
   BOOL          raw, alpha_raw = FALSE;
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-  BOOL          packed_bitmap = FALSE;
-#endif
   png_uint_32   tmp16;
   int           i;
 
@@ -225,21 +222,9 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
   }
   else if ((type_token[1] == '1') || (type_token[1] == '4'))
   {
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
     raw = (type_token[1] == '4');
     color_type = PNG_COLOR_TYPE_GRAY;
-    get_token(pnm_file, width_token);
-    sscanf (width_token, "%lu", &ul_width);
-    width = (png_uint_32) ul_width;
-    get_token(pnm_file, height_token);
-    sscanf (height_token, "%lu", &ul_height);
-    height = (png_uint_32) ul_height;
     bit_depth = 1;
-    packed_bitmap = TRUE;
-#else
-    fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
-    fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
-#endif
   }
   else if ((type_token[1] == '2') || (type_token[1] == '5'))
   {
@@ -358,14 +343,8 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
 
   alpha_present = (channels - 1) % 2;
 
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-  if (packed_bitmap)
-    /* row data is as many bytes as can fit width x channels x bit_depth */
-    row_bytes = (width * channels * bit_depth + 7) / 8;
-  else
-#endif
-    /* row_bytes is the width x number of channels x (bit-depth / 8) */
-    row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
+  /* row_bytes is the width x number of channels x (bit-depth / 8) */
+  row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
 
   if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
     return FALSE;
@@ -375,48 +354,40 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
 
   for (row = 0; row < height; row++)
   {
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-    if (packed_bitmap) {
-      for (i = 0; i < row_bytes; i++)
-        /* png supports this format natively so no conversion is needed */
-        *pix_ptr++ = get_data (pnm_file, 8);
-    } else
-#endif
+    for (col = 0; col < width; col++)
     {
-      for (col = 0; col < width; col++)
+      for (i = 0; i < (channels - alpha_present); i++)
       {
-        for (i = 0; i < (channels - alpha_present); i++)
-        {
-          if (raw)
-            *pix_ptr++ = get_data (pnm_file, bit_depth);
+        if (raw)
+          *pix_ptr++ = get_data (pnm_file, bit_depth);
+        else
+          if (bit_depth <= 8)
+            *pix_ptr++ = get_value (pnm_file, bit_depth);
           else
-            if (bit_depth <= 8)
-              *pix_ptr++ = get_value (pnm_file, bit_depth);
-            else
-            {
-              tmp16 = get_value (pnm_file, bit_depth);
-              *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
-              pix_ptr++;
-              *pix_ptr = (png_byte) (tmp16 & 0xFF);
-              pix_ptr++;
-            }
-        }
+          {
+            tmp16 = get_value (pnm_file, bit_depth);
+            *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
+            pix_ptr++;
+            *pix_ptr = (png_byte) (tmp16 & 0xFF);
+            pix_ptr++;
+          }
+      }
 
-        if (alpha) /* read alpha-channel from pgm file */
-        {
-          if (alpha_raw)
-            *pix_ptr++ = get_data (alpha_file, alpha_depth);
+      if (alpha) /* read alpha-channel from pgm file */
+      {
+        if (alpha_raw)
+          *pix_ptr++ = get_data (alpha_file, alpha_depth);
+        else
+          if (alpha_depth <= 8)
+            *pix_ptr++ = get_value (alpha_file, bit_depth);
           else
-            if (alpha_depth <= 8)
-              *pix_ptr++ = get_value (alpha_file, bit_depth);
-            else
-            {
-              tmp16 = get_value (alpha_file, bit_depth);
-              *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
-              *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
-            }
-        } /* if alpha */
-      } /* if packed_bitmap */
+          {
+            tmp16 = get_value (alpha_file, bit_depth);
+            *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
+            *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
+          }
+      } /* if alpha */
+
     } /* end for col */
   } /* end for row */
 
@@ -433,14 +404,6 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
     return FALSE;
   }
 
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-  if (packed_bitmap == TRUE)
-  {
-    png_set_packing (png_ptr);
-    png_set_invert_mono (png_ptr);
-  }
-#endif
-
   /* setjmp() must be called in every function that calls a PNG-reading libpng function */
   if (setjmp (png_jmpbuf(png_ptr)))
   {
@@ -497,32 +460,19 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
 void get_token(FILE *pnm_file, char *token)
 {
   int i = 0;
-  int ret;
 
-  /* remove white-space and comment lines */
+  /* remove white-space */
   do
   {
-    ret = fgetc(pnm_file);
-    if (ret == '#') {
-      /* the rest of this line is a comment */
-      do
-      {
-        ret = fgetc(pnm_file);
-      }
-      while ((ret != '\n') && (ret != '\r') && (ret != EOF));
-    }
-    if (ret == EOF) break;
-    token[i] = (unsigned char) ret;
+    token[i] = (unsigned char) fgetc (pnm_file);
   }
   while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
 
   /* read string */
   do
   {
-    ret = fgetc(pnm_file);
-    if (ret == EOF) break;
     i++;
-    token[i] = (unsigned char) ret;
+    token[i] = (unsigned char) fgetc (pnm_file);
   }
   while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
 

contrib/tools/fixitxt.c

@@ -1,144 +0,0 @@
-#include <stdio.h>
-
-/* fixitxt version 1.0.0
- *
- * Copyright 2013 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
- *
- * Usage:            
- *
- *     fixitxt.exe < bad.png > good.png
- *
- * Fixes a PNG file written with libpng-1.6.0 or 1.6.1 that has one or more
- * uncompressed iTXt chunks.  Assumes that the actual length is greater
- * than or equal to the value in the length byte, and that the CRC is
- * correct for the actual length.  This program hunts for the CRC and
- * adjusts the length byte accordingly.  It is not an error to process a
- * PNG file that has no iTXt chunks or one that has valid iTXt chunks;
- * such files will simply be copied.
- *
- * Requires zlib (for crc32 and Z_NULL); build with
- *
- *     gcc -O -o fixitxt fixitxt.c -lz
- */
-
-#define MAX_LENGTH 500000
-
-#define GETBREAK c=getchar(); if (c == EOF) break;
-#include <zlib.h>
-
-main()
-{
-   unsigned int i;
-   unsigned char buf[MAX_LENGTH];
-   unsigned long crc;
-   unsigned int c;
-
-/* Skip 8-byte signature */
-   for (i=8; i; i--)
-   {
-      c=GETBREAK;
-      putchar(c);
-   }
-
-if (c != EOF)
-for (;;)
- {
-   /* Read the length */
-   unsigned long length;
-   c=GETBREAK; buf[0] = c;
-   c=GETBREAK; buf[1] = c;
-   c=GETBREAK; buf[2] = c;
-   c=GETBREAK; buf[3] = c;
-
-   length=((((unsigned long) buf[0]<<8 + buf[1]<<16) + buf[2] << 8) + buf[3]);
-   /* Read the chunkname */
-   c=GETBREAK; buf[4] = c;
-   c=GETBREAK; buf[5] = c;
-   c=GETBREAK; buf[6] = c;
-   c=GETBREAK; buf[7] = c;
-
-
-   /* The iTXt chunk type expressed as integers is (105, 84, 88, 116) */
-   if (buf[4] == 105 && buf[5] == 84 && buf[6] == 88 && buf[7] == 116)
-   {
-      if (length >= MAX_LENGTH-12)
-         break;  /* To do: handle this more gracefully */
-
-      /* Initialize the CRC */
-      crc = crc32(0, Z_NULL, 0);
-
-      /* Copy the data bytes */
-      for (i=8; i < length + 12; i++)
-      {
-         c=GETBREAK; buf[i] = c;
-      }
-
-      /* Calculate the CRC */
-      crc = crc32(crc, buf+4, (uInt)length+4);
-
-      for (;;)
-      {
-        /* Check the CRC */
-        if (((crc >> 24) & 0xff) == buf[length+8] &&
-            ((crc >> 16) & 0xff) == buf[length+9] &&
-            ((crc >>  8) & 0xff) == buf[length+10] &&
-            ((crc      ) & 0xff) == buf[length+11])
-           break;
-
-        length++;
-
-        if (length >= MAX_LENGTH-12)
-           break;
-
-        c=GETBREAK;
-        buf[length+11]=c;
-
-        /* Update the CRC */
-        crc = crc32(crc, buf+7+length, 1);
-      }
-
-      /* Update length bytes */
-        buf[0] = (length << 24) & 0xff;
-        buf[1] = (length << 16) & 0xff;
-        buf[2] = (length <<  8) & 0xff;
-        buf[3] = (length      ) & 0xff;
-
-      /* Write the fixed iTXt chunk (length, name, data, crc) */
-      for (i=0; i<length+12; i++)
-         putchar(buf[i]);
-   }
-
-   else
-   {
-      /* Copy bytes that were already read (length and chunk name) */
-      for (i=0; i<8; i++)
-         putchar(buf[i]);
-
-      /* Copy data bytes and CRC */
-      for (i=8; i< length+12; i++)
-      {
-         c=GETBREAK;
-         putchar(c);
-      }
-
-      if (c == EOF)
-      {
-         break;
-      }
-
-   /* The IEND chunk type expressed as integers is (73, 69, 78, 68) */
-      if (buf[4] == 73 && buf[5] == 69 && buf[6] == 78 && buf[7] == 68)
-         break;
-   }
-
-   if (c == EOF)
-      break;
-
-   if (buf[4] == 73 && buf[5] == 69 && buf[6] == 78 && buf[7] == 68)
-     break;
- }
-}

contrib/tools/png-fix-itxt.c

@@ -1,153 +0,0 @@
-
-/* png-fix-itxt version 1.0.0
- *
- * Copyright 2013 Glenn Randers-Pehrson
- * Last changed in libpng 1.6.3 [(PENDING RELEASE)]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * Usage:            
- *
- *     png-fix-itxt.exe < bad.png > good.png
- *
- * Fixes a PNG file written with libpng-1.6.0 or 1.6.1 that has one or more
- * uncompressed iTXt chunks.  Assumes that the actual length is greater
- * than or equal to the value in the length byte, and that the CRC is
- * correct for the actual length.  This program hunts for the CRC and
- * adjusts the length byte accordingly.  It is not an error to process a
- * PNG file that has no iTXt chunks or one that has valid iTXt chunks;
- * such files will simply be copied.
- *
- * Requires zlib (for crc32 and Z_NULL); build with
- *
- *     gcc -O -o png-fix-itxt png-fix-itxt.c -lz
- *
- * If you need to handle iTXt chunks larger than 500000 kbytes you must
- * rebuild png-fix-itxt with a larger values of MAX_LENGTH (or a smaller value
- * if you know you will never encounter such huge iTXt chunks).
- */
-
-#include <stdio.h>
-#include <zlib.h>
-
-#define MAX_LENGTH 500000
-
-#define GETBREAK ((unsigned char)(inchar=getchar())); if (inchar == EOF) break
-
-int
-main(void)
-{
-   unsigned int i;
-   unsigned char buf[MAX_LENGTH];
-   unsigned long crc;
-   unsigned char c;
-   int inchar;
-
-/* Skip 8-byte signature */
-   for (i=8; i; i--)
-   {
-      c=GETBREAK;
-      putchar(c);
-   }
-
-if (inchar != EOF)
-for (;;)
- {
-   /* Read the length */
-   unsigned long length; /* must be 32 bits! */
-   c=GETBREAK; buf[0] = c; length  = c; length <<= 8;
-   c=GETBREAK; buf[1] = c; length += c; length <<= 8;
-   c=GETBREAK; buf[2] = c; length += c; length <<= 8;
-   c=GETBREAK; buf[3] = c; length += c;
-
-   /* Read the chunkname */
-   c=GETBREAK; buf[4] = c;
-   c=GETBREAK; buf[5] = c;
-   c=GETBREAK; buf[6] = c;
-   c=GETBREAK; buf[7] = c;
-
-
-   /* The iTXt chunk type expressed as integers is (105, 84, 88, 116) */
-   if (buf[4] == 105 && buf[5] == 84 && buf[6] == 88 && buf[7] == 116)
-   {
-      if (length >= MAX_LENGTH-12)
-         break;  /* To do: handle this more gracefully */
-
-      /* Initialize the CRC */
-      crc = crc32(0, Z_NULL, 0);
-
-      /* Copy the data bytes */
-      for (i=8; i < length + 12; i++)
-      {
-         c=GETBREAK; buf[i] = c;
-      }
-
-      /* Calculate the CRC */
-      crc = crc32(crc, buf+4, (uInt)length+4);
-
-      for (;;)
-      {
-        /* Check the CRC */
-        if (((crc >> 24) & 0xff) == buf[length+8] &&
-            ((crc >> 16) & 0xff) == buf[length+9] &&
-            ((crc >>  8) & 0xff) == buf[length+10] &&
-            ((crc      ) & 0xff) == buf[length+11])
-           break;
-
-        length++;
-
-        if (length >= MAX_LENGTH-12)
-           break;
-
-        c=GETBREAK;
-        buf[length+11]=c;
-
-        /* Update the CRC */
-        crc = crc32(crc, buf+7+length, 1);
-      }
-
-      /* Update length bytes */
-        buf[0] = (length << 24) & 0xff;
-        buf[1] = (length << 16) & 0xff;
-        buf[2] = (length <<  8) & 0xff;
-        buf[3] = (length      ) & 0xff;
-
-      /* Write the fixed iTXt chunk (length, name, data, crc) */
-      for (i=0; i<length+12; i++)
-         putchar(buf[i]);
-   }
-
-   else
-   {
-      /* Copy bytes that were already read (length and chunk name) */
-      for (i=0; i<8; i++)
-         putchar(buf[i]);
-
-      /* Copy data bytes and CRC */
-      for (i=8; i< length+12; i++)
-      {
-         c=GETBREAK;
-         putchar(c);
-      }
-
-      if (inchar == EOF)
-      {
-         break;
-      }
-
-   /* The IEND chunk type expressed as integers is (73, 69, 78, 68) */
-      if (buf[4] == 73 && buf[5] == 69 && buf[6] == 78 && buf[7] == 68)
-         break;
-   }
-
-   if (inchar == EOF)
-      break;
-
-   if (buf[4] == 73 && buf[5] == 69 && buf[6] == 78 && buf[7] == 68)
-     break;
- }
-
- return 0;
-}

libpng-manual.txt

@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.7.0beta13 - May 13, 2013
+ libpng version 1.7.0beta04 - February 27, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.7.0beta13 - May 13, 2013
+ libpng versions 0.97, January 1998, through 1.7.0beta04 - February 27, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -51,7 +51,9 @@ libpng-manual.txt - A description on how to use and modify libpng
 I. Introduction
 
 This file describes how to use and modify the PNG reference library
-(known as libpng) for your own use.  In addition to this
+(known as libpng) for your own use.  There are five sections to this
+file: introduction, structures, reading, writing, and modification and
+configuration notes for various special platforms.  In addition to this
 file, example.c is a good starting point for using the library, as
 it is heavily commented and should include everything most people
 will need.  We assume that libpng is already installed; see the
@@ -525,15 +527,10 @@ you can retrieve with
 
     png_get_user_chunk_ptr(png_ptr);
 
-If you call the png_set_read_user_chunk_fn() function, then all unknown chunks
-will be passed to your callback when read.  You can cause known chunks to be
-passed in as well by using png_set_keep_unknown_chunks (see below) - this will
-prevent the normal libpng handling of those known chunks.
-
-If your callback returns 0 the default unknown handling will be used (see
-below).  This is new behavior in libpng 1.7, prior to 1.7 it was not possible to
-discard a chunk; PNG_HANDLE_CHUNK_IF_SAFE was forced.  Libpng 1.6.0 issues a
-warning when this was done.
+If you call the png_set_read_user_chunk_fn() function, then all unknown
+chunks will be saved when read, in case your callback function will need
+one or more of them.  This behavior can be changed with the
+png_set_keep_unknown_chunks() function, described below.
 
 At this point, you can set up a callback function that will be
 called after each row has been read, which you can use to control
@@ -3090,34 +3087,13 @@ a writeable buffer of at least 29 bytes.
 
 Writing unknown chunks
 
-You can use the png_set_unknown_chunks function to queue up private chunks
-for writing.  You give it a chunk name, location, raw data, and a size.  You
-also must use png_set_keep_unknown_chunks() to ensure that libpng will
-handle them.  That's all there is to it.  The chunks will be written by the
-next following png_write_info_before_PLTE, png_write_info, or png_write_end
-function, depending upon the specified location.  Any chunks previously
-read into the info structure's unknown-chunk list will also be written out
-in a sequence that satisfies the PNG specification's ordering rules.
-
-Here is an example of writing two private chunks, prVt and miNE:
-
-    #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-    /* Set unknown chunk data */
-    png_unknown_chunk unk_chunk[2];
-    strcpy((char *) unk_chunk[0].name, "prVt";
-    unk_chunk[0].data = (unsigned char *) "PRIVATE DATA";
-    unk_chunk[0].size = strlen(unk_chunk[0].data)+1;
-    unk_chunk[0].location = PNG_HAVE_IHDR;
-    strcpy((char *) unk_chunk[1].name, "miNE";
-    unk_chunk[1].data = (unsigned char *) "MY CHUNK DATA";
-    unk_chunk[1].size = strlen(unk_chunk[0].data)+1;
-    unk_chunk[1].location = PNG_AFTER_IDAT;
-    png_set_unknown_chunks(write_ptr, write_info_ptr,
-        unk_chunk, 2);
-    /* Needed because miNE is not safe-to-copy */
-    png_set_keep_unknown_chunks(png, PNG_HANDLE_CHUNK_ALWAYS,
-       (png_bytep) "miNE", 1);
-    #endif
+You can use the png_set_unknown_chunks function to queue up chunks
+for writing.  You give it a chunk name, raw data, and a size; that's
+all there is to it.  The chunks will be written by the next following
+png_write_info_before_PLTE, png_write_info, or png_write_end function.
+Any chunks previously read into the info structure's unknown-chunk
+list will also be written out in a sequence that satisfies the PNG
+specification's ordering rules.
 
 The high-level write interface
 
@@ -4965,9 +4941,9 @@ symbols, using the PNG_PREFIX macro.
 
 We no longer include string.h in png.h.  The include statement has been moved
 to pngpriv.h, where it is not accessible by applications.  Applications that
-need access to information in string.h must add an '#include <string.h>'
+need access to information in string.h must add an '#include "string.h"'
 directive.  It does not matter whether this is placed prior to or after
-the '#include "png.h"' directive.
+the '"#include png.h"' directive.
 
 The following API are now DEPRECATED:
    png_info_init_3()
@@ -4996,11 +4972,7 @@ where "rp" indicates a "restricted pointer".
 Error detection in some chunks has improved; in particular the iCCP chunk
 reader now does pretty complete validation of the basic format.  Some bad
 profiles that were previously accepted are now rejected, in particular the
-very old broken Microsoft/HP sRGB profile.  The PNG spec requirement that
-only grayscale profiles may appear in images with color type 0 or 4 and that
-even if the image only contains gray pixels, only RGB profiles may appear
-in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
-is allowed to appear in images with any color type.
+very old broken Microsoft/HP sRGB profile.
 
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
@@ -5021,21 +4993,6 @@ The machine-generated configure files are no longer included in branches
 libpng16 and later of the GIT repository.  They continue to be included
 in the tarball releases, however.
 
-Libpng-1.6.0 and later use the CMF bytes at the beginning of the IDAT stream
-to set the size of the sliding window for reading instead of using the default
-32-kbyte sliding window size.  It was discovered that there are hundreds of PNG
-files in the wild that have incorrect CMF bytes that cause libpng to now issue
-a "too far back" error and reject the file.  Libpng-1.6.3 provides a way to
-revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a
-32-kbyte sliding window), and provides a tool
-(contrib/tools/png-fix-too-far-back) for optimizing the CMF bytes
-correctly.
-
-Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
-length, which resulted in PNG files that cannot be read beyond the bad iTXt
-chunk.  This error was fixed in libpng-1.6.3, and a tool (called
-contrib/tools/png-fix-itxt) has been added to the libpng distribution.
-
 XIII.  Changes to Libpng from version 1.6.x to 1.7.x
 
 Some functions that were deprecated in libpng-1.6.0 were removed:
@@ -5085,11 +5042,11 @@ control.  The git repository was built from old libpng-x.y.z.tar.gz files
 going back to version 0.70.  You can access the git repository (read only)
 at
 
-    git://git.code.sf.net/p/libpng/code
+    git://libpng.git.sourceforge.net/gitroot/libpng
 
-or you can browse it with a web browser by selecting the "code" button at
+or you can browse it via "gitweb" at
 
-    https://sourceforge.net/projects/libpng
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
 
 Patches can be sent to glennrp at users.sourceforge.net or to
 png-mng-implement at lists.sourceforge.net or you can upload them to
@@ -5230,13 +5187,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XVII. Y2K Compliance in libpng
 
-May 13, 2013
+February 27, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.7.0beta13 are Y2K compliant.  It is my belief that earlier
+upward through 1.7.0beta04 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "May 13, 2013"
+.TH LIBPNG 3 "February 27, 2013"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta13
+libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta04
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -494,7 +494,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.7.0beta13 - May 13, 2013
+ libpng version 1.7.0beta04 - February 27, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -505,7 +505,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.7.0beta13 - May 13, 2013
+ libpng versions 0.97, January 1998, through 1.7.0beta04 - February 27, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -545,7 +545,9 @@ libpng-manual.txt - A description on how to use and modify libpng
 .SH I. Introduction
 
 This file describes how to use and modify the PNG reference library
-(known as libpng) for your own use.  In addition to this
+(known as libpng) for your own use.  There are five sections to this
+file: introduction, structures, reading, writing, and modification and
+configuration notes for various special platforms.  In addition to this
 file, example.c is a good starting point for using the library, as
 it is heavily commented and should include everything most people
 will need.  We assume that libpng is already installed; see the
@@ -1019,15 +1021,10 @@ you can retrieve with
 
     png_get_user_chunk_ptr(png_ptr);
 
-If you call the png_set_read_user_chunk_fn() function, then all unknown chunks
-will be passed to your callback when read.  You can cause known chunks to be
-passed in as well by using png_set_keep_unknown_chunks (see below) - this will
-prevent the normal libpng handling of those known chunks.
-
-If your callback returns 0 the default unknown handling will be used (see
-below).  This is new behavior in libpng 1.7, prior to 1.7 it was not possible to
-discard a chunk; PNG_HANDLE_CHUNK_IF_SAFE was forced.  Libpng 1.6.0 issues a
-warning when this was done.
+If you call the png_set_read_user_chunk_fn() function, then all unknown
+chunks will be saved when read, in case your callback function will need
+one or more of them.  This behavior can be changed with the
+png_set_keep_unknown_chunks() function, described below.
 
 At this point, you can set up a callback function that will be
 called after each row has been read, which you can use to control
@@ -3584,34 +3581,13 @@ a writeable buffer of at least 29 bytes.
 
 .SS Writing unknown chunks
 
-You can use the png_set_unknown_chunks function to queue up private chunks
-for writing.  You give it a chunk name, location, raw data, and a size.  You
-also must use png_set_keep_unknown_chunks() to ensure that libpng will
-handle them.  That's all there is to it.  The chunks will be written by the
-next following png_write_info_before_PLTE, png_write_info, or png_write_end
-function, depending upon the specified location.  Any chunks previously
-read into the info structure's unknown-chunk list will also be written out
-in a sequence that satisfies the PNG specification's ordering rules.
-
-Here is an example of writing two private chunks, prVt and miNE:
-
-    #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-    /* Set unknown chunk data */
-    png_unknown_chunk unk_chunk[2];
-    strcpy((char *) unk_chunk[0].name, "prVt";
-    unk_chunk[0].data = (unsigned char *) "PRIVATE DATA";
-    unk_chunk[0].size = strlen(unk_chunk[0].data)+1;
-    unk_chunk[0].location = PNG_HAVE_IHDR;
-    strcpy((char *) unk_chunk[1].name, "miNE";
-    unk_chunk[1].data = (unsigned char *) "MY CHUNK DATA";
-    unk_chunk[1].size = strlen(unk_chunk[0].data)+1;
-    unk_chunk[1].location = PNG_AFTER_IDAT;
-    png_set_unknown_chunks(write_ptr, write_info_ptr,
-        unk_chunk, 2);
-    /* Needed because miNE is not safe-to-copy */
-    png_set_keep_unknown_chunks(png, PNG_HANDLE_CHUNK_ALWAYS,
-       (png_bytep) "miNE", 1);
-    #endif
+You can use the png_set_unknown_chunks function to queue up chunks
+for writing.  You give it a chunk name, raw data, and a size; that's
+all there is to it.  The chunks will be written by the next following
+png_write_info_before_PLTE, png_write_info, or png_write_end function.
+Any chunks previously read into the info structure's unknown-chunk
+list will also be written out in a sequence that satisfies the PNG
+specification's ordering rules.
 
 .SS The high-level write interface
 
@@ -5460,9 +5436,9 @@ symbols, using the PNG_PREFIX macro.
 
 We no longer include string.h in png.h.  The include statement has been moved
 to pngpriv.h, where it is not accessible by applications.  Applications that
-need access to information in string.h must add an '#include <string.h>'
+need access to information in string.h must add an '#include "string.h"'
 directive.  It does not matter whether this is placed prior to or after
-the '#include "png.h"' directive.
+the '"#include png.h"' directive.
 
 The following API are now DEPRECATED:
    png_info_init_3()
@@ -5491,11 +5467,7 @@ where "rp" indicates a "restricted pointer".
 Error detection in some chunks has improved; in particular the iCCP chunk
 reader now does pretty complete validation of the basic format.  Some bad
 profiles that were previously accepted are now rejected, in particular the
-very old broken Microsoft/HP sRGB profile.  The PNG spec requirement that
-only grayscale profiles may appear in images with color type 0 or 4 and that
-even if the image only contains gray pixels, only RGB profiles may appear
-in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
-is allowed to appear in images with any color type.
+very old broken Microsoft/HP sRGB profile.
 
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
@@ -5516,21 +5488,6 @@ The machine-generated configure files are no longer included in branches
 libpng16 and later of the GIT repository.  They continue to be included
 in the tarball releases, however.
 
-Libpng-1.6.0 and later use the CMF bytes at the beginning of the IDAT stream
-to set the size of the sliding window for reading instead of using the default
-32-kbyte sliding window size.  It was discovered that there are hundreds of PNG
-files in the wild that have incorrect CMF bytes that cause libpng to now issue
-a "too far back" error and reject the file.  Libpng-1.6.3 provides a way to
-revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a
-32-kbyte sliding window), and provides a tool
-(contrib/tools/png-fix-too-far-back) for optimizing the CMF bytes
-correctly.
-
-Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
-length, which resulted in PNG files that cannot be read beyond the bad iTXt
-chunk.  This error was fixed in libpng-1.6.3, and a tool (called
-contrib/tools/png-fix-itxt) has been added to the libpng distribution.
-
 .SH XIII.  Changes to Libpng from version 1.6.x to 1.7.x
 
 Some functions that were deprecated in libpng-1.6.0 were removed:
@@ -5580,11 +5537,11 @@ control.  The git repository was built from old libpng-x.y.z.tar.gz files
 going back to version 0.70.  You can access the git repository (read only)
 at
 
-    git://git.code.sf.net/p/libpng/code
+    git://libpng.git.sourceforge.net/gitroot/libpng
 
-or you can browse it with a web browser by selecting the "code" button at
+or you can browse it via "gitweb" at
 
-    https://sourceforge.net/projects/libpng
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
 
 Patches can be sent to glennrp at users.sourceforge.net or to
 png-mng-implement at lists.sourceforge.net or you can upload them to
@@ -5725,13 +5682,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XVII. Y2K Compliance in libpng
 
-May 13, 2013
+February 27, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.7.0beta13 are Y2K compliant.  It is my belief that earlier
+upward through 1.7.0beta04 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -5938,7 +5895,7 @@ the first widely used release:
  1.5.7               15    10507  15.so.15.7[.0]
  1.6.0beta01-37      16    10600  16.so.16.0[.0]
  1.7.0alpha01-10     17    10700  17.so.17.0[.0]
- 1.7.0beta01-13      17    10700  17.so.17.0[.0]
+ 1.7.0beta01-04      17    10700  17.so.17.0[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -5995,7 +5952,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.7.0beta13 - May 13, 2013:
+Libpng version 1.7.0beta04 - February 27, 2013:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6018,7 +5975,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.7.0beta13, May 13, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.7.0beta04, February 27, 2013, are
 Copyright (c) 2004,2006-2007 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
@@ -6117,7 +6074,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 13, 2013
+February 27, 2013
 
 .\" end of man page
 

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "May 13, 2013"
+.TH LIBPNGPF 3 "February 27, 2013"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta13
+libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta04
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "May 13, 2013"
+.TH PNG 5 "February 27, 2013"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -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_7_0beta13 Your_png_h_is_not_version_1_7_0beta13;
+typedef png_libpng_version_1_7_0beta04 Your_png_h_is_not_version_1_7_0beta04;
 
 /* 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
@@ -115,7 +115,7 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
 {
    int need_crc = 1;
 
-   if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))
+   if (PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name))
    {
       if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
           (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
@@ -691,13 +691,13 @@ png_get_copyright(png_const_structrp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.7.0beta13 - May 13, 2013" PNG_STRING_NEWLINE \
+     "libpng version 1.7.0beta04 - February 27, 2013" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2013 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 1.7.0beta13 - May 13, 2013\
+      return "libpng version 1.7.0beta04 - February 27, 2013\
       Copyright (c) 1998-2013 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -1774,7 +1774,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
          "length does not match profile");
 
    temp = png_get_uint_32(profile+128); /* tag count: 12 bytes/tag */
-   if (temp > 357913930 || /* (2^32-4-132)/12: maximum possible tag count */
+   if (temp > 357913930 || /* (2^32-4-132)/12: maxium possible tag count */
       profile_length < 132+12*temp) /* truncated tag table */
       return png_icc_profile_error(png_ptr, colorspace, name, temp,
          "tag count too large");
@@ -2087,7 +2087,7 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
          if (length == png_sRGB_checks[i].length &&
             intent == png_sRGB_checks[i].intent)
          {
-            /* Now calculate the adler32 if not done already. */
+            /* Now calculate the alder32 if not done already. */
             if (adler == 0)
             {
                adler = adler32(0, NULL, 0);
@@ -2183,10 +2183,7 @@ png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace,
       png_icc_check_tag_table(png_ptr, colorspace, name, profile_length,
          profile))
    {
-#     ifdef PNG_sRGB_SUPPORTED
-         /* If no sRGB support, don't try storing sRGB information */
-         png_icc_set_sRGB(png_ptr, colorspace, profile, 0);
-#     endif
+      png_icc_set_sRGB(png_ptr, colorspace, profile, 0);
       return 1;
    }
 
@@ -4065,27 +4062,6 @@ png_build_gamma_tables(png_structrp png_ptr, int bit_depth)
 }
 #endif /* READ_GAMMA */
 
-/* HARDWARE OPTION SUPPORT */
-#ifdef PNG_SET_OPTION_SUPPORTED
-int PNGAPI
-png_set_option(png_structrp png_ptr, int option, int onoff)
-{
-   if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT &&
-      (option & 1) == 0)
-   {
-      int mask = 3 << option;
-      int setting = (2 + (onoff != 0)) << option;
-      int current = png_ptr->options;
-
-      png_ptr->options = (png_byte)((current & ~mask) | setting);
-
-      return (current & mask) >> option;
-   }
-
-   return PNG_OPTION_INVALID;
-}
-#endif
-
 /* sRGB support */
 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)

png.h

@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.7.0beta13 - May 13, 2013
+ * libpng version 1.7.0beta04 - February 27, 2013
  * Copyright (c) 1998-2013 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.)
@@ -11,7 +11,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.7.0beta13 - May 13, 2013: Glenn
+ *   libpng versions 0.97, January 1998, through 1.7.0beta04 - February 27, 2013: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -168,7 +168,7 @@
  *    1.5.7                   15    10507  15.so.15.7[.0]
  *    1.6.0beta01-37          16    10600  16.so.16.0[.0]
  *    1.7.0alpha01-10         17    10700  17.so.17.0[.0]
- *    1.7.0beta01-13          17    10700  17.so.17.0[.0]
+ *    1.7.0beta01-04          17    10700  17.so.17.0[.0]
  *
  *   Henceforth the source version will match the shared-library major
  *   and minor numbers; the shared-library major version number will be
@@ -200,7 +200,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.7.0beta13, May 13, 2013, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.7.0beta04, February 27, 2013, are
  * Copyright (c) 2004, 2006-2013 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:
@@ -312,13 +312,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 13, 2013
+ *    February 27, 2013
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.7.0beta13 are Y2K compliant.  It is my belief that
+ *    upward through 1.7.0beta04 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -378,9 +378,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.7.0beta13"
+#define PNG_LIBPNG_VER_STRING "1.7.0beta04"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.7.0beta13 - May 13, 2013\n"
+     " libpng version 1.7.0beta04 - February 27, 2013\n"
 
 #define PNG_LIBPNG_VER_SONUM   17
 #define PNG_LIBPNG_VER_DLLNUM  17
@@ -394,7 +394,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  13
+#define PNG_LIBPNG_VER_BUILD  04
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -464,6 +464,11 @@
 
 #ifndef PNG_VERSION_INFO_ONLY
 
+/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */
@@ -471,129 +476,17 @@
 
 /* This file is arranged in several sections:
  *
- * 1. ISO-PNG constants and definitions; values defined by PNG and not specific
- *    to the libpng API.
- * 2. Any configuration options that can be specified by for the application
+ * 1. Any configuration options that can be specified by for the application
  *    code when it is built.  (Build time configuration is in pnglibconf.h)
- * 3. Type definitions (base types are defined in pngconf.h), structure
+ * 2. Type definitions (base types are defined in pngconf.h), structure
  *    definitions.
- * 4. Exported library functions.
- * 5. Simplified API.
+ * 3. Exported library functions.
+ * 4. Simplified API.
  *
  * The library source code has additional files (principally pngpriv.h) that
  * allow configuration of the library.
  */
-
-/* Section 1: ISO PNG constants and macros. */
-
-/* ISO-PNG defines byte encodings for 16 and 32-bit unsigned values and 32-bit
- * signed values.  The macros PNG_U16, PNG_U32 and PNG_S32 return values of type
- * (png_uint_16), (png_uint_32) and (png_int_32) which are target machine
- * specific representations of these values, using the types defined in
- * pngconf.h.  The macros take two or four byte values in the order in which
- * they would occur in a PNG stream.
- *
- * These macros must return compile time constants if passed constant values -
- * machine specific implementations are not permitted.  These macros are used by
- * default in the API functions/macros png_get_uint_16, png_get_uint_32,
- * png_get_uint_31 and png_get_int_32 declared below: these functions or macros
- * are the correct places for machine specific implementations (such as hardware
- * specific instructions.)
- *
- * The macros defined here are generic and intended to give maximum flexibility
- * in implementation to the compiler; only PNG_S32 contains a sequence point,
- * there are no side effects and the expressions used permit the maximum
- * parallelization (relevant because the four bytes may be loaded in parallel.)
- */
-#define PNG_u2(b1, b2) (((unsigned int)(b1) << 8) + (b2))
-
-#define PNG_U16(b1, b2) ((png_uint_16)PNG_u2(b1, b2))
-#define PNG_U32(b1, b2, b3, b4)\
-   (((png_uint_32)PNG_u2(b1, b2) << 16) + PNG_u2(b3, b4))
-
-/* ISO-PNG states that signed 32-bit values are stored in two's complement
- * format.  There is no guarantee that (png_int_32) is exactly 32 bits, so the
- * following macro tests for a negative number and generates the machine format
- * directly by portable arithmetic operations.  The cost is that the argument
- * 'b1' is evaluated twice.
- */
-#define PNG_S32(b1, b2, b3, b4) ((b1) & 0x80\
-      ? -(png_int_32)((PNG_U32(b1, b2, b3, b4) ^ 0xffffffff) + 1)\
-      : (png_int_32)PNG_U32(b1, b2, b3, b4))
-
-/* Constants for known chunk types.
- *
- * MAINTAINERS: If you need to add a chunk, define the name here.
- * For historical reasons these constants have the form png_<name>; i.e.
- * the prefix is lower case.  Please use decimal values as the parameters to
- * match the ISO PNG specification and to avoid relying on the C locale
- * interpretation of character values.
- *
- * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
- * type.  In fact the specification does not express chunk types this way,
- * however using a 32-bit value means that the chunk type can be read from the
- * stream using exactly the same code as used for a 32-bit unsigned value and
- * can be examined far more efficiently (using one arithmetic compare).
- *
- * Prior to 1.5.6 the chunk type constants were expressed as C strings.  The
- * libpng API still uses strings for 'unknown' chunks and a macro,
- * PNG_STRING_FROM_CHUNK, allows a string to be generated if required.  Notice
- * that for portable code numeric values must still be used; the string "IHDR"
- * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
- *
- * In 1.7.0 the definitions were made public in png.h to avoid having to
- * duplicate the same definitions in application code.
- */
-#define png_IHDR PNG_U32( 73,  72,  68,  82)
-#define png_IDAT PNG_U32( 73,  68,  65,  84)
-#define png_IEND PNG_U32( 73,  69,  78,  68)
-#define png_PLTE PNG_U32( 80,  76,  84,  69)
-#define png_bKGD PNG_U32( 98,  75,  71,  68)
-#define png_cHRM PNG_U32( 99,  72,  82,  77)
-#define png_gAMA PNG_U32(103,  65,  77,  65)
-#define png_hIST PNG_U32(104,  73,  83,  84)
-#define png_iCCP PNG_U32(105,  67,  67,  80)
-#define png_iTXt PNG_U32(105,  84,  88, 116)
-#define png_oFFs PNG_U32(111,  70,  70, 115)
-#define png_pCAL PNG_U32(112,  67,  65,  76)
-#define png_sCAL PNG_U32(115,  67,  65,  76)
-#define png_pHYs PNG_U32(112,  72,  89, 115)
-#define png_sBIT PNG_U32(115,  66,  73,  84)
-#define png_sPLT PNG_U32(115,  80,  76,  84)
-#define png_sRGB PNG_U32(115,  82,  71,  66)
-#define png_sTER PNG_U32(115,  84,  69,  82)
-#define png_tEXt PNG_U32(116,  69,  88, 116)
-#define png_tIME PNG_U32(116,  73,  77,  69)
-#define png_tRNS PNG_U32(116,  82,  78,  83)
-#define png_zTXt PNG_U32(122,  84,  88, 116)
-
-/* The following will work on (signed char*) strings, whereas the PNG_U32 macro
- * used directory would fail on top-bit-set values because of the sign
- * extension.
- */
-#define PNG_CHUNK_FROM_STRING(s)\
-   PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
-
-/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
- * signed and the argument is a (char[])  This macro will fail miserably on
- * systems where (char) is more than 8 bits.
- */
-#define PNG_STRING_FROM_CHUNK(s,c)\
-   (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
-   ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
-
-/* Do the same but terminate with a null character. */
-#define PNG_CSTRING_FROM_CHUNK(s,c)\
-   (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
-
-/* Test on flag values as defined in the spec (section 5.4): */
-#define PNG_CHUNK_ANCILLARY(c)    (1 & ((c) >> 29))
-#define PNG_CHUNK_CRITICAL(c)     (!PNG_CHUNK_ANCILLARY(c))
-#define PNG_CHUNK_PRIVATE(c)      (1 & ((c) >> 21))
-#define PNG_CHUNK_RESERVED(c)     (1 & ((c) >> 13))
-#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >>  5))
-
-/* Section 2: run time configuration
+/* Section 1: run time configuration
  * See pnglibconf.h for build time configuration
  *
  * Run time configuration allows the application to choose between
@@ -623,12 +516,7 @@
  * Otherwise the calls are mapped to png_error.
  */
 
-/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Section 3: type definitions, including structures and compile time
+/* Section 2: type definitions, including structures and compile time
  * constants.
  * See pngconf.h for base types that vary by machine/system
  */
@@ -636,7 +524,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_7_0beta13;
+typedef char* png_libpng_version_1_7_0beta04;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
@@ -1072,7 +960,7 @@ typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
     png_alloc_size_t));
 typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
 
-/* Section 4: exported functions
+/* Section 3: exported functions
  * Here are the function definitions most commonly used.  This is not
  * the place to find out how to use libpng.  See libpng-manual.txt for the
  * full explanation, see example.c for the summary.  This just provides
@@ -1949,7 +1837,7 @@ PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp));
 #endif
 
 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-/* This callback is called only for *unknown* chunks.  If
+/* This callback is called only for *unknown* chunks, if
  * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known
  * chunks to be treated as unknown, however in this case the callback must do
  * any processing required by the chunk (e.g. by calling the appropriate
@@ -1961,13 +1849,11 @@ PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp));
  * The integer return from the callback function is interpreted thus:
  *
  * negative: An error occured, png_chunk_error will be called.
- *     zero: The chunk was not handled, the default unknown handling is used
- *           (even if this was a chunk that would otherwise be known.)
- *           NOTE: prior to libpng 1.7 handling values of
- *           PNG_HANDLE_CHUNK_AS_DEFAULT and PNG_HANDLE_CHUNK_NEVER were
- *           converted to PNG_HANDLE_CHUNK_IF_SAFE (libpng 1.6.0 warns if this
- *           happens) so it was not possible to discard unknown chunk data if a
- *           user callback was installed.
+ *     zero: The chunk was not handled, the chunk will be discarded unless
+ *           png_set_keep_unknown_chunks has been used to set a 'keep' behavior
+ *           for this particular chunk, in which case that will be used.  A
+ *           critical chunk will cause an error at this point unless it is to be
+ *           saved.
  * positive: The chunk was handled, libpng will ignore/discard it.
  */
 PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr,
@@ -2482,21 +2368,16 @@ PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr,
  * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was
  * ignored and the default was used, the per-chunk setting only had an effect on
  * write.  If you wish to have chunk-specific handling on read in code that must
- * work on earlier versions you must use a user chunk callback to implement the
+ * work on earlier versions you must use a user chunk callback to specify the
  * desired handling (keep or discard.)
  *
- * NOTE: prior to 1.7.0 when a user callback returned '0', indicating that the
- * chunk had not been handled, libpng would preserve it regardless of the
- * default or per-chunk settings.  For compatibility with earlier versions
- * simply return '1' (handled) from the callback to discard the chunk.
- *
  * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below.  The
  * parameter is interpreted as follows:
  *
  * READ:
  *    PNG_HANDLE_CHUNK_AS_DEFAULT:
  *       Known chunks: do normal libpng processing, do not keep the chunk (but
- *          see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+ *          set the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
  *       Unknown chunks: for a specific chunk use the global default, when used
  *          as the default discard the chunk data.
  *    PNG_HANDLE_CHUNK_NEVER:
@@ -2852,18 +2733,27 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
 
 #ifdef PNG_USE_READ_MACROS
 /* Inline macros to do direct reads of bytes from the input buffer.
+ * The png_get_int_32() routine assumes we are using two's complement
+ * format for negative values, which is almost certainly true.
  */
-#  define PNG_B(ptr, offset) (((png_const_bytep)(ptr))[offset])
 #  define PNG_get_uint_32(buf) \
-      PNG_U32(PNG_B(buf,0), PNG_B(buf,1), PNG_B(buf,2), PNG_B(buf,3))
+     (((png_uint_32)(*(buf)) << 24) + \
+      ((png_uint_32)(*((buf) + 1)) << 16) + \
+      ((png_uint_32)(*((buf) + 2)) << 8) + \
+      ((png_uint_32)(*((buf) + 3))))
 
    /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
     * function) incorrectly returned a value of type png_uint_32.
     */
-#  define PNG_get_uint_16(buf) PNG_U16(PNG_B(buf,0), PNG_B(buf,1))
+#  define PNG_get_uint_16(buf) \
+     ((png_uint_16) \
+      (((unsigned int)(*(buf)) << 8) + \
+       ((unsigned int)(*((buf) + 1)))))
 
 #  define PNG_get_int_32(buf) \
-      PNG_S32(PNG_B(buf,0), PNG_B(buf,1), PNG_B(buf,2), PNG_B(buf,3))
+     ((png_int_32)((*(buf) & 0x80) \
+      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
+      : (png_int_32)png_get_uint_32(buf)))
 
    /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h,
     * but defining a macro name prefixed with PNG_PREFIX.
@@ -2882,63 +2772,8 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
 #  endif
 #endif
 
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-PNG_EXPORT(242, void, png_set_check_for_invalid_index,
-    (png_structrp png_ptr, int allowed));
-#  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
-PNG_EXPORT(243, int, png_get_palette_max, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-#  endif
-#endif /* CHECK_FOR_INVALID_INDEX */
-
 /*******************************************************************************
- *  IMPLEMENTATION OPTIONS
- *******************************************************************************
- *
- * Support for arbitrary implementation-specific optimizations.  The API allows
- * particular options to be turned on or off.  'Option' is the number of the
- * option and 'onoff' is 0 (off) or non-0 (on).  The value returned is given
- * by the PNG_OPTION_ defines below.
- *
- * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
- *           are detected at run time, however sometimes it may be impossible
- *           to do this in user mode, in which case it is necessary to discover
- *           the capabilities in an OS specific way.  Such capabilities are
- *           listed here when libpng has support for them and must be turned
- *           ON by the application if present.
- *
- * SOFTWARE: sometimes software optimizations actually result in performance
- *           decrease on some architectures or systems, or with some sets of
- *           PNG images.  'Software' options allow such optimizations to be
- *           selected at run time.
- */
-#ifdef PNG_SET_OPTION_SUPPORTED
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-#  define PNG_ARM_NEON   0 /* HARDWARE: ARM Neon SIMD instructions supported */
-#endif
-#define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */
-#define PNG_OPTION_NEXT  4 /* Next option - numbers must be even */
-
-/* Return values: NOTE: there are four values and 'off' is *not* zero */
-#define PNG_OPTION_UNSET   0 /* Unset - defaults to off */
-#define PNG_OPTION_INVALID 1 /* Option number out of range */
-#define PNG_OPTION_OFF     2
-#define PNG_OPTION_ON      3
-
-PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
-   int onoff));
-#endif
-
-/*******************************************************************************
- *  END OF HARDWARE OPTIONS
- ******************************************************************************/
-
-/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
- * defs
- */
-
-/*******************************************************************************
- *  Section 5: SIMPLIFIED API
+ *  SIMPLIFIED API
  *******************************************************************************
  *
  * Please read the documentation in libpng-manual.txt (TODO: write said
@@ -3258,24 +3093,6 @@ typedef struct
     * slight speed gain.
     */
 
-#define PNG_IMAGE_FLAG_16BIT_sRGB 0x04
-   /* On read if the image is a 16-bit per component image and there is no gAMA
-    * or sRGB chunk assume that the components are sRGB encoded.  Notice that
-    * images output by the simplified API always have gamma information; setting
-    * this flag only affects the interpretation of 16-bit images from an
-    * external source.  It is recommended that the application expose this flag
-    * to the user; the user can normally easily recognize the difference between
-    * linear and sRGB encoding.  This flag has no effect on write - the data
-    * passed to the write APIs must have the correct encoding (as defined
-    * above.)
-    *
-    * If the flag is not set (the default) input 16-bit per component data is
-    * assumed to be linear.
-    *
-    * NOTE: the flag can only be set after the png_image_begin_read_ call,
-    * because that call initializes the 'flags' field.
-    */
-
 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
 /* READ APIs
  * ---------
@@ -3326,7 +3143,7 @@ PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image,
     *    PNG_FORMAT_FLAG_LINEAR *not* set.
     *
     * For linear output removing the alpha channel is always done by compositing
-    * on black and background is ignored.
+    * on black and background is ignored.:
     *
     * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set.  It must
     * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE.
@@ -3388,12 +3205,25 @@ PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,
  *  END OF SIMPLIFIED API
  ******************************************************************************/
 
+#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
+PNG_EXPORT(242, void, png_set_check_for_invalid_index,
+    (png_structrp png_ptr, int allowed));
+#  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
+PNG_EXPORT(243, int, png_get_palette_max, (png_const_structrp png_ptr,
+    png_const_inforp info_ptr));
+#  endif
+#endif /* CHECK_FOR_INVALID_INDEX */
+
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
+ * defs
+ */
+
 /* The last ordinal number (this is the *last* one already used; the next
  * one to use is one more than this.)  Maintainer, remember to add an entry to
  * scripts/symbols.def as well.
  */
 #ifdef PNG_EXPORT_LAST_ORDINAL
-  PNG_EXPORT_LAST_ORDINAL(244);
+  PNG_EXPORT_LAST_ORDINAL(243);
 #endif
 
 #ifdef __cplusplus

pngconf.h

@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.7.0beta13 - May 13, 2013
+ * libpng version 1.7.0beta04 - February 27, 2013
  *
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngmem.c

@@ -155,12 +155,10 @@ png_realloc_array,(png_structrp png_ptr, png_const_voidp old_array,
    }
 
 #ifdef PNG_READ_SUPPORTED
-# ifdef PNG_USER_LIMITS_SUPPORTED
    /* The potential overflow case.  Set the cache counter so libpng will
     * not make any more attempts
     */
    png_ptr->user_chunk_cache_max = 2;
-# endif
 #endif
 
    return NULL; /* error */

pngpriv.h

@@ -616,6 +616,71 @@
  */
 #endif
 
+/* Constants for known chunk types.  If you need to add a chunk, define the name
+ * here.  For historical reasons these constants have the form png_<name>; i.e.
+ * the prefix is lower case.  Please use decimal values as the parameters to
+ * match the ISO PNG specification and to avoid relying on the C locale
+ * interpretation of character values.
+ *
+ * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
+ * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
+ * to be generated if required.
+ *
+ * PNG_32b correctly produces a value shifted by up to 24 bits, even on
+ * architectures where (int) is only 16 bits.
+ */
+#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
+#define PNG_CHUNK(b1,b2,b3,b4) \
+   (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
+
+#define png_IHDR PNG_CHUNK( 73,  72,  68,  82)
+#define png_IDAT PNG_CHUNK( 73,  68,  65,  84)
+#define png_IEND PNG_CHUNK( 73,  69,  78,  68)
+#define png_PLTE PNG_CHUNK( 80,  76,  84,  69)
+#define png_bKGD PNG_CHUNK( 98,  75,  71,  68)
+#define png_cHRM PNG_CHUNK( 99,  72,  82,  77)
+#define png_gAMA PNG_CHUNK(103,  65,  77,  65)
+#define png_hIST PNG_CHUNK(104,  73,  83,  84)
+#define png_iCCP PNG_CHUNK(105,  67,  67,  80)
+#define png_iTXt PNG_CHUNK(105,  84,  88, 116)
+#define png_oFFs PNG_CHUNK(111,  70,  70, 115)
+#define png_pCAL PNG_CHUNK(112,  67,  65,  76)
+#define png_sCAL PNG_CHUNK(115,  67,  65,  76)
+#define png_pHYs PNG_CHUNK(112,  72,  89, 115)
+#define png_sBIT PNG_CHUNK(115,  66,  73,  84)
+#define png_sPLT PNG_CHUNK(115,  80,  76,  84)
+#define png_sRGB PNG_CHUNK(115,  82,  71,  66)
+#define png_sTER PNG_CHUNK(115,  84,  69,  82)
+#define png_tEXt PNG_CHUNK(116,  69,  88, 116)
+#define png_tIME PNG_CHUNK(116,  73,  77,  69)
+#define png_tRNS PNG_CHUNK(116,  82,  78,  83)
+#define png_zTXt PNG_CHUNK(122,  84,  88, 116)
+
+/* The following will work on (signed char*) strings, whereas the get_uint_32
+ * macro will fail on top-bit-set values because of the sign extension.
+ */
+#define PNG_CHUNK_FROM_STRING(s)\
+   PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
+
+/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
+ * signed and the argument is a (char[])  This macro will fail miserably on
+ * systems where (char) is more than 8 bits.
+ */
+#define PNG_STRING_FROM_CHUNK(s,c)\
+   (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
+   ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
+
+/* Do the same but terminate with a null character. */
+#define PNG_CSTRING_FROM_CHUNK(s,c)\
+   (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
+
+/* Test on flag values as defined in the spec (section 5.4): */
+#define PNG_CHUNK_ANCILLIARY(c)   (1 & ((c) >> 29))
+#define PNG_CHUNK_CRITICAL(c)     (!PNG_CHUNK_ANCILLIARY(c))
+#define PNG_CHUNK_PRIVATE(c)      (1 & ((c) >> 21))
+#define PNG_CHUNK_RESERVED(c)     (1 & ((c) >> 13))
+#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >>  5))
+
 /* Gamma values (new at libpng-1.5.4): */
 #define PNG_GAMMA_MAC_OLD 151724  /* Assume '1.8' is really 2.2/1.45! */
 #define PNG_GAMMA_MAC_INVERSE 65909
@@ -629,24 +694,6 @@
 #include "pngstruct.h"
 #include "pnginfo.h"
 
-/* Validate the include paths - the include path used to generate pnglibconf.h
- * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
- */
-#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
-#  error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
-      "-I (include path) error: see the notes in pngpriv.h"
-   /* This means that when pnglibconf.h was built the copy of zlib.h that it
-    * used is not the same as the one being used here.  Because the build of
-    * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
-    * zlib version number and because this affects handling of certain broken
-    * PNG files the -I directives must match.
-    *
-    * The most likely explanation is that you passed a -I in CFLAGS, this will
-    * not work; all the preprocessor directories and in particular all the -I
-    * directives must be in CPPFLAGS.
-    */
-#endif
-
 /* This is used for 16 bit gamma tables -- only the top level pointers are
  * const; this could be changed:
  */

pngread.c

@@ -2004,28 +2004,6 @@ png_image_read_colormap(png_voidp argument)
    else
       back_b = back_r = back_g = 255;
 
-   /* Default the input file gamma if required - this is necessary because
-    * libpng assumes that if no gamma information is present the data is in the
-    * output format, but the simplified API deduces the gamma from the input
-    * format.
-    */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) == 0)
-   {
-      /* Do this directly, not using the png_colorspace functions, to ensure
-       * that it happens even if the colorspace is invalid (though probably if
-       * it is the setting will be ignored)  Note that the same thing can be
-       * achieved at the application interface with png_set_gAMA.
-       */
-      if (png_ptr->bit_depth == 16 &&
-         (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0)
-         png_ptr->colorspace.gamma = PNG_GAMMA_LINEAR;
-
-      else
-         png_ptr->colorspace.gamma = PNG_GAMMA_sRGB_INVERSE;
-
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
-   }
-
    /* Decide what to do based on the PNG color type of the input data.  The
     * utility function png_create_colormap_entry deals with most aspects of the
     * output transformations; this code works out how to produce bytes of
@@ -3569,8 +3547,7 @@ png_image_read_direct(png_voidp argument)
       {
          png_fixed_point input_gamma_default;
 
-         if ((base_format & PNG_FORMAT_FLAG_LINEAR) &&
-            (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0)
+         if (base_format & PNG_FORMAT_FLAG_LINEAR)
             input_gamma_default = PNG_GAMMA_LINEAR;
          else
             input_gamma_default = PNG_DEFAULT_sRGB;

pngrtran.c

@@ -227,8 +227,6 @@ translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
        */
 #     ifdef PNG_READ_sRGB_SUPPORTED
          png_ptr->flags |= PNG_FLAG_ASSUME_sRGB;
-#     else
-         PNG_UNUSED(png_ptr)
 #     endif
       if (is_screen)
          output_gamma = PNG_GAMMA_sRGB;
@@ -1058,6 +1056,9 @@ png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr
 {
    png_debug(1, "in png_set_read_user_transform_fn");
 
+   if (!png_rtran_ok(png_ptr, 0))
+      return;
+
 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->read_user_transform_fn = read_user_transform_fn;

pngrutil.c

@@ -18,6 +18,17 @@
 
 #ifdef PNG_READ_SUPPORTED
 
+png_uint_32 PNGAPI
+png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
+{
+   png_uint_32 uval = png_get_uint_32(buf);
+
+   if (uval > PNG_UINT_31_MAX)
+      png_error(png_ptr, "PNG unsigned integer out of range");
+
+   return (uval);
+}
+
 #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED)
 /* The following is a variation on the above for use with the fixed
  * point values used for gAMA and cHRM.  Instead of png_error it
@@ -40,7 +51,7 @@ png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf)
 
    return PNG_FIXED_ERROR;
 }
-#endif /* READ_gAMA or READ_cHRM */
+#endif
 
 #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
 /* NOTE: the read macros will obscure these definitions, so that if
@@ -56,39 +67,49 @@ png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf)
 png_uint_32 (PNGAPI
 png_get_uint_32)(png_const_bytep buf)
 {
-   return PNG_U32(buf[0], buf[1], buf[2], buf[3]);
+   png_uint_32 uval =
+       ((png_uint_32)(*(buf    )) << 24) +
+       ((png_uint_32)(*(buf + 1)) << 16) +
+       ((png_uint_32)(*(buf + 2)) <<  8) +
+       ((png_uint_32)(*(buf + 3))      ) ;
+
+   return uval;
 }
 
-/* Grab a signed 32-bit integer from a buffer in big-endian format. */
+/* Grab a signed 32-bit integer from a buffer in big-endian format.  The
+ * data is stored in the PNG file in two's complement format and there
+ * is no guarantee that a 'png_int_32' is exactly 32 bits, therefore
+ * the following code does a two's complement to native conversion.
+ */
 png_int_32 (PNGAPI
 png_get_int_32)(png_const_bytep buf)
 {
-   return PNG_S32(buf[0], buf[1], buf[2], buf[3]);
+   png_uint_32 uval = png_get_uint_32(buf);
+   if ((uval & 0x80000000) == 0) /* non-negative */
+      return uval;
+
+   uval = (uval ^ 0xffffffff) + 1;  /* 2's complement: -x = ~x+1 */
+   return -(png_int_32)uval;
 }
 
 /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
 png_uint_16 (PNGAPI
 png_get_uint_16)(png_const_bytep buf)
 {
-   return PNG_U16(buf[0], buf[1]);
+   /* ANSI-C requires an int value to accomodate at least 16 bits so this
+    * works and allows the compiler not to worry about possible narrowing
+    * on 32 bit systems.  (Pre-ANSI systems did not make integers smaller
+    * than 16 bits either.)
+    */
+   unsigned int val =
+       ((unsigned int)(*buf) << 8) +
+       ((unsigned int)(*(buf + 1)));
+
+   return (png_uint_16)val;
 }
+
 #endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */
 
-/* This is an exported function however its error handling is too harsh for most
- * internal use.  For example if it were used for reading the chunk parameters
- * it would error out even on ancillary chunks that can be ignored.
- */
-png_uint_32 PNGAPI
-png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
-{
-   png_uint_32 uval = png_get_uint_32(buf);
-
-   if (uval > PNG_UINT_31_MAX)
-      png_error(png_ptr, "PNG unsigned integer out of range");
-
-   return uval;
-}
-
 /* Read and check the PNG file signature */
 void /* PRIVATE */
 png_read_sig(png_structrp png_ptr, png_inforp info_ptr)
@@ -198,7 +219,7 @@ png_crc_finish(png_structrp png_ptr, png_uint_32 skip)
 
    if (png_crc_error(png_ptr))
    {
-      if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) ?
+      if (PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name) ?
           !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) :
           (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))
       {
@@ -227,7 +248,7 @@ png_crc_error(png_structrp png_ptr)
    png_uint_32 crc;
    int need_crc = 1;
 
-   if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))
+   if (PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name))
    {
       if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
           (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
@@ -311,7 +332,7 @@ png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn)
  * chunk apparently owns the stream.  Prior to release it does a png_error.
  */
 static int
-png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
+png_inflate_claim(png_structrp png_ptr, png_uint_32 owner, int window_bits)
 {
    if (png_ptr->zowner != 0)
    {
@@ -346,22 +367,6 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
     */
    {
       int ret; /* zlib return code */
-#     if PNG_ZLIB_VERNUM >= 0x1240
-
-#        if defined(PNG_SET_OPTION_SUPPORTED) && \
-            defined(PNG_MAXIMUM_INFLATE_WINDOW)
-            int window_bits;
-
-            if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
-               PNG_OPTION_ON)
-               window_bits = 15;
-
-            else
-               window_bits = 0;
-#        else
-#           define window_bits 0
-#        endif
-#     endif
 
       /* Set this for safety, just in case the previous owner left pointers to
        * memory allocations.
@@ -373,7 +378,8 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
 
       if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED)
       {
-#        if PNG_ZLIB_VERNUM < 0x1240
+#        if ZLIB_VERNUM < 0x1240
+            PNG_UNUSED(window_bits)
             ret = inflateReset(&png_ptr->zstream);
 #        else
             ret = inflateReset2(&png_ptr->zstream, window_bits);
@@ -382,7 +388,7 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
 
       else
       {
-#        if PNG_ZLIB_VERNUM < 0x1240
+#        if ZLIB_VERNUM < 0x1240
             ret = inflateInit(&png_ptr->zstream);
 #        else
             ret = inflateInit2(&png_ptr->zstream, window_bits);
@@ -400,10 +406,6 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
 
       return ret;
    }
-
-#  ifdef window_bits
-#     undef window_bits
-#  endif
 }
 
 #ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
@@ -558,7 +560,7 @@ png_decompress_chunk(png_structrp png_ptr,
     */
    png_alloc_size_t limit = PNG_SIZE_MAX;
 
-#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
+#  ifdef PNG_SET_USER_LIMITS_SUPPOPRTED
       if (png_ptr->user_chunk_malloc_max > 0 &&
          png_ptr->user_chunk_malloc_max < limit)
          limit = png_ptr->user_chunk_malloc_max;
@@ -576,8 +578,14 @@ png_decompress_chunk(png_structrp png_ptr,
       if (limit < *newlength)
          *newlength = limit;
 
-      /* Now try to claim the stream. */
-      ret = png_inflate_claim(png_ptr, png_ptr->chunk_name);
+      /* Now try to claim the stream; the 'warn' setting causes zlib to be told
+       * to use the maximum window size during inflate; this hides errors in the
+       * deflate header window bits value which is used if '0' is passed.  In
+       * fact this only has an effect with zlib versions 1.2.4 and later - see
+       * the comments in png_inflate_claim above.
+       */
+      ret = png_inflate_claim(png_ptr, png_ptr->chunk_name,
+         png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN ? 15 : 0);
 
       if (ret == Z_OK)
       {
@@ -1347,7 +1355,8 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
          {
             read_length -= keyword_length+2;
 
-            if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK)
+            if (png_inflate_claim(png_ptr, png_iCCP,
+               png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN ? 15 : 0) == Z_OK)
             {
                Byte profile_header[132];
                Byte local_buffer[PNG_INFLATE_BUF_SIZE];
@@ -2690,7 +2699,7 @@ png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length)
       png_ptr->unknown_chunk.data = NULL;
    }
 
-#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
+#  ifdef PNG_SET_USER_LIMITS_SUPPOPRTED
       if (png_ptr->user_chunk_malloc_max > 0 &&
          png_ptr->user_chunk_malloc_max < limit)
          limit = png_ptr->user_chunk_malloc_max;
@@ -2792,19 +2801,36 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
             if (ret < 0)
                png_chunk_error(png_ptr, "error in user chunk");
 
-            else if (ret > 0) /* chunk was handled */
+            else if (ret == 0)
+            {
+               /* If the keep value is 'default' or 'never' override it, but
+                * still error out on critical chunks unless the keep value is
+                * 'always'  While this is weird it is the behavior in 1.4.12.  A
+                * possible improvement would be to obey the value set for the
+                * chunk, but this would be an API change that would probably
+                * damage some applications.
+                *
+                * The png_app_warning below catches the case that matters, where
+                * the application has neither set specific save for this chunk
+                * or global save.
+                */
+               if (keep < PNG_HANDLE_CHUNK_IF_SAFE)
+               {
+#                 ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
+                     if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE)
+                        png_app_warning(png_ptr,
+ "forcing save of an unhandled chunk; please call png_set_keep_unknown_chunks");
+#                 endif
+                  keep = PNG_HANDLE_CHUNK_IF_SAFE;
+               }
+            }
+
+            else /* chunk was handled */
             {
                handled = 1;
                /* Critical chunks can be safely discarded at this point. */
                keep = PNG_HANDLE_CHUNK_NEVER;
             }
-
-            /* else: use the default handling.
-             * NOTE: this is an API change in 1.7.0, prior to 1.7.0 libpng would
-             * force keep to PNG_HANDLE_CHUNK_IF_SAFE at this point, and 1.6.0
-             * would issue a warning if this caused a default of discarding the
-             * chunk to be changed.
-             */
          }
 
          else
@@ -2827,7 +2853,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
 
          if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
             (keep == PNG_HANDLE_CHUNK_IF_SAFE &&
-             PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
+             PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name)))
          {
             if (!png_cache_unknown_chunk(png_ptr, length))
                keep = PNG_HANDLE_CHUNK_NEVER;
@@ -2861,7 +2887,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
        */
       if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
          (keep == PNG_HANDLE_CHUNK_IF_SAFE &&
-          PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
+          PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name)))
       {
 #     ifdef PNG_USER_LIMITS_SUPPORTED
          switch (png_ptr->user_chunk_cache_max)
@@ -3325,7 +3351,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
                      png_uint_32p dp32 = png_aligncast(png_uint_32p,dp);
                      png_const_uint_32p sp32 = png_aligncastconst(
                         png_const_uint_32p, sp);
-                     size_t skip = (bytes_to_jump-bytes_to_copy) /
+                     unsigned int skip = (bytes_to_jump-bytes_to_copy) /
                         (sizeof (png_uint_32));
 
                      do
@@ -3367,7 +3393,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
                      png_uint_16p dp16 = png_aligncast(png_uint_16p, dp);
                      png_const_uint_16p sp16 = png_aligncastconst(
                         png_const_uint_16p, sp);
-                     size_t skip = (bytes_to_jump-bytes_to_copy) /
+                     unsigned int skip = (bytes_to_jump-bytes_to_copy) /
                         (sizeof (png_uint_16));
 
                      do
@@ -3953,7 +3979,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
          png_ptr->zstream.avail_out = out;
       }
 
-      else /* after last row, checking for end */
+      else /* check for end */
       {
          png_ptr->zstream.next_out = tmpbuf;
          png_ptr->zstream.avail_out = (sizeof tmpbuf);
@@ -3968,13 +3994,10 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
        */
       ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
 
-      /* Take the unconsumed output back. */
-      if (output != NULL)
-         avail_out += png_ptr->zstream.avail_out;
-
-      else /* avail_out counts the extra bytes */
-         avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out;
-
+      /* Take the unconsumed output back (so, in the 'check' case this just
+       * counts up).
+       */
+      avail_out += png_ptr->zstream.avail_out;
       png_ptr->zstream.avail_out = 0;
 
       if (ret == Z_STREAM_END)
@@ -4013,7 +4036,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
       if (output != NULL)
          png_error(png_ptr, "Not enough image data");
 
-      else /* the deflate stream contained extra data */
+      else /* checking */
          png_chunk_benign_error(png_ptr, "Too much image data");
    }
 }
@@ -4424,7 +4447,7 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
     * IDAT stream has a bogus deflate header window_bits value, but this should
     * not be happening any longer!)
     */
-   if (png_inflate_claim(png_ptr, png_IDAT) != Z_OK)
+   if (png_inflate_claim(png_ptr, png_IDAT, 0) != Z_OK)
       png_error(png_ptr, png_ptr->zstream.msg);
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;

pngset.c

@@ -1256,6 +1256,8 @@ png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
 {
    /* This API is pretty pointless in 1.6.0 because the location can be set
     * before the call to png_set_unknown_chunks.
+    *
+    * TODO: add a png_app_warning in 1.7
     */
    if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
       chunk < info_ptr->unknown_chunks_num)
@@ -1274,10 +1276,6 @@ png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
       info_ptr->unknown_chunks[chunk].location =
          check_location(png_ptr, location);
    }
-
-   /* TODO: make this an error in 1.8 (or maybe it will become one in 1.7!) */
-   else if (png_ptr != NULL)
-      png_app_warning(png_ptr, "unknown chunk index out of range");
 }
 #endif
 

pngstruct.h

@@ -508,11 +508,6 @@ struct png_struct_def
    png_byte filter_type;
 #endif
 
-   /* Options */
-#ifdef PNG_SET_OPTION_SUPPORTED
-   png_byte options;           /* On/off state (up to 4 options) */
-#endif
-
    /* COMPRESSION AND DECOMPRESSION SUPPORT.
     *
     * zlib expects a 'zstream' as the fundamental control structure, it allows

pngtest.c

@@ -43,23 +43,7 @@
 
 #include "png.h"
 
-/* Known chunks that exist in pngtest.png must be supported or pngtest will fail
- * simply as a result of re-ordering them.  This may be fixed in 1.7
- */
-#if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
-   defined PNG_READ_bKGD_SUPPORTED &&\
-   defined PNG_READ_cHRM_SUPPORTED &&\
-   defined PNG_READ_gAMA_SUPPORTED &&\
-   defined PNG_READ_oFFs_SUPPORTED &&\
-   defined PNG_READ_pCAL_SUPPORTED &&\
-   defined PNG_READ_pHYs_SUPPORTED &&\
-   defined PNG_READ_sBIT_SUPPORTED &&\
-   defined PNG_READ_sCAL_SUPPORTED &&\
-   defined PNG_READ_sRGB_SUPPORTED &&\
-   defined PNG_READ_tEXt_SUPPORTED &&\
-   defined PNG_READ_tIME_SUPPORTED &&\
-   defined PNG_READ_zTXt_SUPPORTED
-
+#ifdef PNG_READ_SUPPORTED /* else nothing can be done */
 #include PNG_ZLIB_HEADER /* defined by pnglibconf.h */
 /* Copied from pngpriv.h but only used in error messages below. */
 #ifndef PNG_ZBUF_SIZE
@@ -719,18 +703,18 @@ static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr,
 static void
 write_sTER_chunk(png_structp write_ptr)
 {
-   png_byte sTER[5] = {115,  84,  69,  82, '\0'};
+   png_byte png_sTER[5] = {115,  84,  69,  82, '\0'};
 
    if (verbose)
       fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
 
-   png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
+   png_write_chunk(write_ptr, png_sTER, &user_chunk_data.sTER_mode, 1);
 }
 
 static void
 write_vpAg_chunk(png_structp write_ptr)
 {
-   png_byte vpAg[5] = {118, 112,  65, 103, '\0'};
+   png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
 
    png_byte vpag_chunk_data[9];
 
@@ -743,7 +727,7 @@ write_vpAg_chunk(png_structp write_ptr)
    png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
    png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
    vpag_chunk_data[8] = user_chunk_data.vpAg_units;
-   png_write_chunk(write_ptr, vpAg, vpag_chunk_data, 9);
+   png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
 }
 
 static void
@@ -1958,10 +1942,9 @@ main(void)
 {
    fprintf(STDERR,
       " test ignored because libpng was not built with read support\n");
-   /* And skip this test */
-   return 77;
+   return 0;
 }
 #endif
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_7_0beta13 Your_png_h_is_not_version_1_7_0beta13;
+typedef png_libpng_version_1_7_0beta04 Your_png_h_is_not_version_1_7_0beta04;

pngtrans.c

@@ -784,17 +784,6 @@ png_set_user_transform_info(png_structrp png_ptr, png_voidp
 
    if (png_ptr == NULL)
       return;
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
-      (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
-   {
-      png_app_error(png_ptr,
-            "info change after png_start_read_image or png_read_update_info");
-      return;
-   }
-#endif
-
    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;

pngwrite.c

@@ -500,50 +500,50 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
       error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
 #endif /* PNG_USER_MEM_SUPPORTED */
 
-   if (png_ptr != NULL)
-   {
-      /* Set the zlib control values to defaults; they can be overridden by the
-       * application after the struct has been created.
-       */
-      png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
+   /* Set the zlib control values to defaults; they can be overridden by the
+    * application after the struct has been created.
+    */
+   png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
 
-      /* The 'zlib_strategy' setting is irrelevant because png_default_claim in
-       * pngwutil.c defaults it according to whether or not filters will be
-       * used, and ignores this setting.
-       */
-      png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
-      png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
-      png_ptr->zlib_mem_level = 8;
-      png_ptr->zlib_window_bits = 15;
-      png_ptr->zlib_method = 8;
+   /* The 'zlib_strategy' setting is irrelevant because png_default_claim in
+    * pngwutil.c defaults it according to whether or not filters will be used,
+    * and ignores this setting.
+    */
+   png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
+   png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
+   png_ptr->zlib_mem_level = 8;
+   png_ptr->zlib_window_bits = 15;
+   png_ptr->zlib_method = 8;
 
 #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
-      png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY;
-      png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION;
-      png_ptr->zlib_text_mem_level = 8;
-      png_ptr->zlib_text_window_bits = 15;
-      png_ptr->zlib_text_method = 8;
+   png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY;
+   png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION;
+   png_ptr->zlib_text_mem_level = 8;
+   png_ptr->zlib_text_window_bits = 15;
+   png_ptr->zlib_text_method = 8;
 #endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */
 
-      /* This is a highly dubious configuration option; by default it is off,
-       * but it may be appropriate for private builds that are testing
-       * extensions not conformant to the current specification, or of
-       * applications that must not fail to write at all costs!
-       */
-#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
+   /* This is a highly dubious configuration option; by default it is off, but
+    * it may be appropriate for private builds that are testing extensions not
+    * conformant to the current specification, or of applications that must not
+    * fail to write at all costs!
+    */
+#  ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
       png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
       /* In stable builds only warn if an application error can be completely
        * handled.
        */
-#endif
+#  endif
 
-      /* App warnings are warnings in release (or release candidate) builds but
-       * are errors during development.
-       */
-#if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
-         png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
-#endif
+   /* App warnings are warnings in release (or release candidate) builds but
+    * are errors during development.
+    */
+#  if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
+      png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
+#  endif
 
+   if (png_ptr != NULL)
+   {
       /* TODO: delay this, it can be done in png_init_io() (if the app doesn't
        * do it itself) avoiding setting the default function if it is not
        * required.

pngwutil.c

@@ -1748,9 +1748,6 @@ png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key,
    {
       if (comp.input_len > PNG_UINT_31_MAX-prefix_len)
          png_error(png_ptr, "iTXt: uncompressed text too long");
-
-      /* So the string will fit in a chunk: */
-      comp.output_len = (png_uint_32)/*SAFE*/comp.input_len;
    }
 
    png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len);
@@ -1765,7 +1762,7 @@ png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key,
       png_write_compressed_data_out(png_ptr, &comp);
 
    else
-      png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.output_len);
+      png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.input_len);
 
    png_write_chunk_end(png_ptr);
 }

projects/vstudio/readme.txt

@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.7.0beta13 - May 13, 2013
+libpng version 1.7.0beta04 - February 27, 2013
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 

projects/vstudio/zlib.props

@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.7.0beta13 - May 13, 2013
+ * libpng version 1.7.0beta04 - February 27, 2013
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *

scripts/README.txt

@@ -1,9 +1,9 @@
 
-Makefiles for  libpng version 1.7.0beta13 - May 13, 2013
+Makefiles for  libpng version 1.7.0beta04 - February 27, 2013
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng17.so.17.1.7.0beta13)
+                       (gcc, creates libpng17.so.17.1.7.0beta04)
  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 libpng17.so.17.1.7.0beta13)
+                       (gcc, creates libpng17.so.17.1.7.0beta04)
  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 libpng17.so.17.1.7.0beta13)
+                       creates libpng17.so.17.1.7.0beta04)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng17.so.17.1.7.0beta13)
+                       creates libpng17.so.17.1.7.0beta04)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng17.so.17.1.7.0beta13)
+                       creates libpng17.so.17.1.7.0beta04)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile

scripts/checksym.awk

@@ -113,16 +113,6 @@ END{
       err = 1
    }
    unexported=0
-   # Add a standard header to symbols.new:
-   print ";Version INSERT-VERSION-HERE" >of
-   print ";--------------------------------------------------------------" >of
-   print "; LIBPNG symbol list as a Win32 DEF file" >of
-   print "; Contains all the symbols that can be exported from libpng" >of
-   print ";--------------------------------------------------------------" >of
-   print "LIBRARY" >of
-   print "" >of
-   print "EXPORTS" >of
-
    for (o=1; o<=lasto; ++o) {
       if (symbol[o] == "" && removed[o] == "") {
          if (unexported == 0) unexported = o

scripts/def.dfn

@@ -21,7 +21,7 @@ PNG_DFN "OS2 DESCRIPTION "PNG image compression library""
 PNG_DFN "OS2 CODE PRELOAD MOVEABLE DISCARDABLE"
 PNG_DFN ""
 PNG_DFN "EXPORTS"
-PNG_DFN ";Version 1.7.0beta13"
+PNG_DFN ";Version 1.7.0beta04"
 
 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
         PNG_DFN "@" SYMBOL_PREFIX "@@" name "@"

scripts/dfn.awk

@@ -61,143 +61,78 @@ $1 ~ /^PNG_DFN_END_SORT/{
 }
 
 /^[^"]*PNG_DFN *".*"[^"]*$/{
-   # A definition line, apparently correctly formated, extract the
-   # definition then replace any doubled "" that remain with a single
-   # double quote.  Notice that the original doubled double quotes
-   # may have been split by tokenization
-   #
-   # Sometimes GCC splits the PNG_DFN lines, we know this has happened
-   # if the quotes aren't closed and must read another line.  In this
-   # case it is essential to reject lines that start '#' because those
-   # are introduced #line directives.
-   orig=$0
-   line=$0
-   lineno=FNR
-   if (lineno == "") lineno=NR
+    # A definition line, apparently correctly formated, extract the
+    # definition then replace any doubled "" that remain with a single
+    # double quote.  Notice that the original doubled double quotes
+    # may have been split by tokenization
+    orig=$0
 
-   if (sub(/^[^"]*PNG_DFN *"/,"",line) != 1) {
-	print "line", lineno ": processing failed:"
+    if (gsub(/^[^"]*PNG_DFN *"/,"") != 1 || gsub(/"[^"]*$/, "") != 1) {
+	print "line", NR, "processing failed:"
 	print orig
+	print $0
 	err=1
-       next
-   } else {
+    } else {
 	++out_count
-   }
+    }
 
-   # Now examine quotes within the value:
-   #
-   #   @" - delete this and any following spaces
-   #   "@ - delete this and any preceding spaces
-   #   @' - replace this by a double quote
-   #
-   # This allows macro substitution by the C compiler thus:
-   #
-   #   #define first_name John
-   #   #define last_name Smith
-   #
-   #	PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
-   #
-   # Might get C preprocessed to:
-   #
-   #   PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
-   #
-   # Which this script reduces to:
-   #
-   #	#define name "John Smith"
-   #
-   while (1) {
-      # While there is an @" remove it and the next "@
-      if (line ~ /@"/) {
-         if (line ~ /@".*"@/) {
-            # Do this special case first to avoid swallowing extra spaces
-            # before or after the @ stuff:
-            if (!sub(/@" *"@/, "", line)) {
-               # Ok, do it in pieces - there has to be a non-space between the
-               # two.  NOTE: really weird things happen if a leading @" is
-               # lost - the code will error out below (I believe).
-               if (!sub(/@" */, "", line) || !sub(/ *"@/, "", line)) {
-                  print "line", lineno, ": internal error:", orig
-                  exit 1
-               }
-            }
-         }
+    # Now examine quotes within the value:
+    #
+    #   @" - delete this and any following spaces
+    #   "@ - delete this and any original spaces
+    #   @' - replace this by a double quote
+    #
+    # This allows macro substitution by the C compiler thus:
+    #
+    #   #define first_name John
+    #   #define last_name Smith
+    #
+    #	PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
+    #
+    # Might get C preprocessed to:
+    #
+    #   PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
+    #
+    # Which this script reduces to:
+    #
+    #	#define name "John Smith"
+    #
+    while (sub(/@" */, "")) {
+	if (!sub(/ *"@/, "")) {
+	    print "unbalanced @\" ... \"@ pair"
+	    err=1
+	    break
+	}
+    }
 
-         # There is no matching "@.  Assume a split line
-         else while (1) {
-            if (getline nextline) {
-               # If the line starts with '#' it is a preprocesor line directive
-               # from cc -E, skip it:
-               if (nextline !~ /^#/) {
-                  line = line " " nextline
-                  break
-               }
-            } else {
-               # This is end-of-input - probably a missig "@ on the first line:
-               print "line", lineno ": unbalanced @\" ... \"@ pair"
-               err=1
-               next
-            }
-         }
+    # Put any needed double quotes in
+    gsub(/@'/,"\"")
 
-         # Keep going until all the @" have gone
-         continue
-      }
+    # Remove any trailing spaces (not really required, but for
+    # editorial consistency
+    sub(/ *$/, "")
 
-      # Attempt to remove a trailing " (not preceded by '@') - if this can
-      # be done stop now, if not assume a split line again
-      if (sub(/"[^"]*$/, "", line))
-         break
+    # Remove trailing CR
+    sub (/
 $/, "")
-      # Read another line
-      while (1) {
-         if (getline nextline) {
-            if (nextline !~ /^#/) {
-               line = line " " nextline
-               # Go back to stripping @" "@ pairs
-               break
-            }
-         } else {
-            print "line", lineno ": unterminated PNG_DFN string"
-            err=1
-            next
-         }
-      }
-   }
+
+    if (sort)
        array[$(sort)] = $0
-   # Put any needed double quotes in (at the end, because these would otherwise
-   # interfere with the processing above.)
-   gsub(/@'/,"\"", line)
-
-   # Remove any trailing spaces (not really required, but for
-   # editorial consistency
-   sub(/ *$/, "", line)
-
-   # Remove trailing CR
-   sub(/
-$/, "", line)
-
-   if (sort) {
-      if (split(line, parts) < sort) {
-         print "line", lineno ": missing sort field:", line
-         err=1
-      } else
-         array[parts[sort]] = line
-   }
-
-   else
-      print line >out
+
+    else
+       print $0 >out
     next
 }
 
-/PNG_DFN/{
-   print "line", NR, "incorrectly formated PNG_DFN line:"
-   print $0
+/PNG_DFN/{
+    print "line", NR, "incorrectly formated PNG_DFN line:"
+    print $0
     err = 1
 }
 
-END{
+END{
     if (out_count > 0 || err > 0)
 	exit err
-
-   print "no definition lines found"
+
+    print "no definition lines found"
     exit 1

scripts/libpng-config-head.in

@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.7.0beta13
+version=1.7.0beta04
 prefix=""
 libdir=""
 libs=""

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng17
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.7.0beta13
+Version: 1.7.0beta04
 Libs: -L${libdir} -lpng17
 Cflags: -I${includedir}

scripts/makefile.ne12bsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng17
 
 LIB=	png17
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.7.0beta13
+SHLIB_MINOR=	1.7.0beta04
 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=	17
-SHLIB_MINOR=	1.7.0beta13
+SHLIB_MINOR=	1.7.0beta04
 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=	17
-SHLIB_MINOR=	1.7.0beta13
+SHLIB_MINOR=	1.7.0beta04
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \

scripts/options.awk

@@ -64,15 +64,11 @@ BEGIN{
    logunsupported=0             # write unsupported options too
 
    # Precreate arrays
-   # for each option:
    option[""] = ""    # list of all options: default enabled/disabled
    done[""] = 1       # marks option as having been output
    requires[""] = ""  # requires by option
    iffs[""] = ""      # if by option
    enabledby[""] = "" # options that enable it by option
-   sets[""] = ""      # settings set by each option
-   setval[""] = ""    # value to set (indexed: 'option sets[option]')
-   # for each setting:
    setting[""] = ""   # requires by setting
    defaults[""] = ""  # used for a defaulted value
    doneset[""] = 1    # marks setting as having been output
@@ -204,7 +200,7 @@ $1 == "com"{
    if (NF > 1) {
       # sub(/^[ 	]*com[ 	]*/, "")
       $1 = ""
-      print comment $0, cend >out
+      print comment, $0, cend >out
    } else
       print start end >out
    next
@@ -241,9 +237,7 @@ $1 == "file" && NF >= 2{
    next
 }
 
-# option NAME ( (requires|enables|if) NAME* | on | off | disabled |
-#                sets SETTING VALUE+ )*
-#     
+# option NAME ( (requires|enables|if) NAME* | on | off | disabled )*
 #   Declares an option 'NAME' and describes its default setting (disabled)
 #   and its relationship to other options.  The option is disabled
 #   unless *all* the options listed after 'requires' are set and at
@@ -304,7 +298,7 @@ $1 == "option" && NF >= 2{
                   break
                }
             }
-         } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
+         } else if (val == "requires" || val == "if" || val == "enables") {
             key = val
          } else if (key == "requires") {
             requires[opt] = requires[opt] " " val
@@ -312,12 +306,6 @@ $1 == "option" && NF >= 2{
             iffs[opt] = iffs[opt] " " val
          } else if (key == "enables") {
             enabledby[val] = enabledby[val] " " opt
-         } else if (key == "sets") {
-            sets[opt] = sets[opt] " " val
-            key = "setval"
-            set = val
-         } else if (key == "setval") {
-            setval[opt " " set] = setval[opt " " set] " " val
          } else
             break # bad line format
       }
@@ -534,7 +522,83 @@ END{
       exit 0
    }
 
-   # Do the options first (allowing options to set settings).  The dependency
+   # Do the 'setting' values first, the algorithm the standard
+   # tree walk (O(1)) done in an O(2) while/for loop; interations
+   # settings x depth, outputing the deepest required macros
+   # first.
+   print "" >out
+   print "/* SETTINGS */" >out
+   print comment, "settings", cend >out
+   # Sort (in dfn.awk) on field 2, the setting name
+   print "PNG_DFN_START_SORT 2" >out
+   finished = 0
+   while (!finished) {
+      finished = 1
+      movement = 0 # done nothing
+      for (i in setting) if (!doneset[i]) {
+         nreqs = split(setting[i], r)
+         if (nreqs > 0) {
+            for (j=1; j<=nreqs; ++j) if (!doneset[r[j]]) {
+               break
+            }
+            if (j<=nreqs) {
+               finished = 0
+               continue # try a different setting
+            }
+         }
+
+         # All the requirements have been processed, output
+         # this setting.
+         if (deb) print "setting", i
+         deflt = defaults[i]
+         # A leading @ means leave it unquoted so the preprocessor
+         # can substitute the build time value
+         if (deflt ~ /^ @/)
+            deflt = " " subs substr(deflt, 3) sube
+         # Remove any spurious trailing spaces
+         sub(/ *$/,"",deflt)
+         print "" >out
+         print "/* setting: ", i >out
+         print " *   requires:" setting[i] >out
+         print " *   default: ", defaults[i] defltinfo, "*/" >out
+         if (defaults[i] == "") { # no default, only check if defined
+            print "#ifdef PNG_" i >out
+         }
+         for (j=1; j<=nreqs; ++j) {
+            print "# ifndef PNG_" r[j] >out
+            print error, i, "requires", r[j] end >out
+            print "# endif" >out
+         }
+         if (defaults[i] != "") { # default handling
+            print "#ifdef PNG_" i >out
+         }
+         # PNG_<i> is defined, so substitute the value:
+         print def i, subs "PNG_" i sube end >out
+         if (defaults[i] != "") {
+            print "#else /*default*/" >out
+            # And add the default definition for the benefit
+            # of later settings an options test:
+            print "# define PNG_" i deflt >out
+            print def i deflt end >out
+         }
+         print "#endif" >out
+
+         doneset[i] = 1
+         ++movement
+      }
+
+      if (!finished && !movement) {
+         print "setting: loop or missing setting in 'requires', cannot process:"
+         for (i in setting) if (!doneset[i]) {
+            print "  setting", i, "requires" setting[i]
+         }
+         exit 1
+      }
+   }
+   print "PNG_DFN_END_SORT" >out
+   print comment, "end of settings", cend >out
+
+   # Now do the options - somewhat more complex.  The dependency
    # tree is thus:
    #
    #   name     >     name
@@ -626,7 +690,7 @@ END{
    }
    if (err) exit 1
 
-   # Sort options:
+   # Sort options too
    print "PNG_DFN_START_SORT 2" >out
 
    # option[i] is now the complete list of all the tokens we may
@@ -666,9 +730,8 @@ END{
          print "" >out
          print "/* option:", i, option[i] >out
          print " *   requires:  " requires[i] >out
-         print " *   if:        " iffs[i] >out
-         print " *   enabled-by:" enabledby[i] >out
-         print " *   sets:      " sets[i], "*/" >out
+         print " *   if:      " iffs[i] >out
+         print " *   enabled-by:" enabledby[i], "*/" >out
          print "#undef PNG_on" >out
          print "#define PNG_on 1" >out
 
@@ -751,21 +814,6 @@ END{
             print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
          } else if (i !~ /^ok_/) {
             print def i sup >out
-            # Supported option, set required settings
-            nreqs = split(sets[i], r)
-            for (j=1; j<=nreqs; ++j) {
-               print "#    ifdef PNG_set_" r[j] >out
-               # Some other option has already set a value:
-               print error, i, "sets", r[j] ": duplicate setting" end >out
-               print error, "   previous value: " end "PNG_set_" r[j] >out
-               print "#    else" >out
-               # Else set the default: note that this won't accept arbitrary
-               # values, the setval string must be acceptable to all the C
-               # compilers we use.  That means it must be VERY simple; a number,
-               # a name or a string.
-               print "#     define PNG_set_" r[j], setval[i " " r[j]] >out
-               print "#    endif" >out
-            }
          }
          print "#   endif /* definition */" >out
          print "#endif /*requires, if*/" >out
@@ -799,93 +847,6 @@ END{
    print "PNG_DFN_END_SORT" >out
    print comment, "end of options", cend >out
 
-   # Do the 'setting' values second, the algorithm the standard
-   # tree walk (O(1)) done in an O(2) while/for loop; interations
-   # settings x depth, outputing the deepest required macros
-   # first.
-   print "" >out
-   print "/* SETTINGS */" >out
-   print comment, "settings", cend >out
-   # Sort (in dfn.awk) on field 2, the setting name
-   print "PNG_DFN_START_SORT 2" >out
-   finished = 0
-   while (!finished) {
-      finished = 1
-      movement = 0 # done nothing
-      for (i in setting) if (!doneset[i]) {
-         nreqs = split(setting[i], r)
-         if (nreqs > 0) {
-            # By default assume the requires values are options, but if there
-            # is no option with that name check for a setting
-            for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
-               break
-            }
-            if (j<=nreqs) {
-               finished = 0
-               continue # try a different setting
-            }
-         }
-
-         # All the requirements have been processed, output
-         # this setting.
-         if (deb) print "setting", i
-         deflt = defaults[i]
-         # Remove any spurious trailing spaces
-         sub(/ *$/,"",deflt)
-         # A leading @ means leave it unquoted so the preprocessor
-         # can substitute the build time value
-         if (deflt ~ /^ @/)
-            deflt = " " subs substr(deflt, 3) sube
-         print "" >out
-         print "/* setting: ", i >out
-         print " *   requires:" setting[i] >out
-         print " *   default: ", defaults[i] deflt, "*/" >out
-         for (j=1; j<=nreqs; ++j) {
-            if (option[r[j]] != "")
-               print "#ifndef PNG_" r[j] "_SUPPORTED" >out
-            else
-               print "#ifndef PNG_" r[j] >out
-            print error, i, "requires", r[j] end >out
-            print "# endif" >out
-         }
-         # The precedence is:
-         #
-         #  1) External definition; trumps:
-         #  2) Option 'sets' value; trumps:
-         #  3) Setting 'default'
-         #
-         print "#ifdef PNG_" i >out
-         # PNG_<i> is defined, so substitute the value:
-         print def i, subs "PNG_" i sube end >out
-         print "#else /* use default */" >out
-         print "# ifdef PNG_set_" i >out
-         # Value from an option 'sets' argument
-         print def i, subs "PNG_set_" i sube end >out
-         # This is so that subsequent tests on the setting work:
-         print "#  define PNG_" i, "1" >out
-         if (defaults[i] != "") {
-            print "# else /*default*/" >out
-            print def i deflt end >out
-            print "#  define PNG_" i, "1" >out
-         }
-         print "# endif /* defaults */" >out
-         print "#endif /* setting", i, "*/" >out
-
-         doneset[i] = 1
-         ++movement
-      }
-
-      if (!finished && !movement) {
-         print "setting: loop or missing setting in 'requires', cannot process:"
-         for (i in setting) if (!doneset[i]) {
-            print "  setting", i, "requires" setting[i]
-         }
-         exit 1
-      }
-   }
-   print "PNG_DFN_END_SORT" >out
-   print comment, "end of settings", cend >out
-
    # Regular end - everything looks ok
    if (protect != "") {
       print start "#endif", "/*", protect, "*/" end >out

scripts/pnglibconf.dfa

@@ -27,7 +27,7 @@ file pnglibconf.h scripts/pnglibconf.dfa PNGLCONF_H
 # The syntax is detailed in scripts/options.awk; this is a summary
 # only:
 #
-# setting <name> [requires ...] [default]
+# setting <name> [default]
 #    #define PNG_<name> <value>  /* value comes from current setting */
 # option <name> [requires ...] [if ...] [enables ...] [disabled]
 #    #define PNG_<name>_SUPPORTED if the requirements are met and
@@ -165,12 +165,6 @@ logunsupported = 1
 @#  endif
 @#endif
 
-# This changes the default for the ARM NEON optimizations according to
-# __ARM_NEON__
-@#ifdef __ARM_NEON__
-@#  define PNG_ARM_NEON_SUPPORTED
-@#endif
-
 # IN DEVELOPMENT
 # These are currently experimental features; define them if you want (NOTE:
 # experimental options must be disabled before they are defined in this file!)
@@ -228,23 +222,11 @@ setting ZLIB_HEADER default <zlib.h>
 
 setting FILTER_OPTIMIZATIONS
 
-# Implementation specific control of the optimizations, enabled by those
-# hardware or software options that need it (typically when run-time choices
-# must be made by the user)
-option SET_OPTION disabled
+# This option turns on runtime checks for ARM NEON support, it is irrelevant
+# on other platforms and it is irrelevant unless NEON code is turned on.  Checks
+# are on by default
 
-# These options are specific to the ARM NEON hardware optimizations:
-#
-# ARM_NEON: the optimization itself
-# ARM_NEON_API: allow the optimization to be switched on with png_set_hardware
-# ARM_NEON_CHECK: compile a run-time check to see if Neon extensions are
-setting ZLIB_VERNUM default @ZLIB_VERNUM
-#                 supported, this is poorly supported and deprectated - use the
-#                 png_set_hardware API.
-option ARM_NEON disabled,
-   sets FILTER_OPTIMIZATIONS png_init_filter_functions_neon
-option ARM_NEON_API disabled enables SET_OPTION ARM_NEON
-option ARM_NEON_CHECK disabled enables ARM_NEON
+option ARM_NEON_CHECK
 
 # These settings configure the default compression level (0-9) and 'strategy';
 # strategy is as defined by the implementors of zlib, it describes the input
@@ -426,7 +408,7 @@ option SET_USER_LIMITS requires USER_LIMITS
 # to libpng 1.6; the new interfaces in 1.6 will take several years to become
 # popular.
 
-option READ enables READ_INTERLACING SET_OPTION
+option READ enables READ_INTERLACING
 
 # Disabling READ_16BIT does not disable reading 16-bit PNG files, but it
 # forces them to be chopped down to 8-bit, and disables any 16-bit

scripts/pnglibconf.h.prebuilt

@@ -1,8 +1,6 @@
-/* libpng 1.7.0beta13 STANDARD API DEFINITION */
-
 /* pnglibconf.h - library build configuration */
 
-/* Libpng version 1.7.0beta13 - May 13, 2013 */
+/* libpng version 1.7.0beta04 - February 27, 2013 */
 
 /* Copyright (c) 1998-2013 Glenn Randers-Pehrson */
 
@@ -15,12 +13,34 @@
 /* Derived from: scripts/pnglibconf.dfa */
 #ifndef PNGLCONF_H
 #define PNGLCONF_H
+/* settings */
+#define PNG_ABORT { (abort()); }
+#define PNG_API_RULE 0
+#define PNG_CALLOC_SUPPORTED
+#define PNG_COST_SHIFT 3
+#define PNG_DEFAULT_READ_MACROS 1
+#define PNG_GAMMA_THRESHOLD_FIXED 5000
+#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
+#define PNG_INFLATE_BUF_SIZE 1024
+#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_TEXT_Z_DEFAULT_COMPRESSION Z_DEFAULT_COMPRESSION
+#define PNG_TEXT_Z_DEFAULT_STRATEGY Z_DEFAULT_STRATEGY
+#define PNG_WEIGHT_SHIFT 8
+#define PNG_ZBUF_SIZE 8192
+#define PNG_ZLIB_HEADER <zlib.h>
+#define PNG_Z_DEFAULT_COMPRESSION Z_DEFAULT_COMPRESSION
+#define PNG_Z_DEFAULT_NOFILTER_STRATEGY Z_DEFAULT_STRATEGY
+#define PNG_Z_DEFAULT_STRATEGY Z_FILTERED
+#define PNG_sCAL_PRECISION 5
+#define PNG_sRGB_PROFILE_CHECKS 2
+/* end of settings */
 /* options */
 #define PNG_16BIT_SUPPORTED
 #define PNG_ALIGNED_MEMORY_SUPPORTED
-/*#undef PNG_ARM_NEON_API_SUPPORTED*/
-/*#undef PNG_ARM_NEON_CHECK_SUPPORTED*/
-/*#undef PNG_ARM_NEON_SUPPORTED*/
+#define PNG_ARM_NEON_CHECK_SUPPORTED
 #define PNG_BENIGN_ERRORS_SUPPORTED
 #define PNG_BENIGN_READ_ERRORS_SUPPORTED
 /*#undef PNG_BENIGN_WRITE_ERRORS_SUPPORTED*/
@@ -103,7 +123,6 @@
 #define PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
 #define PNG_SEQUENTIAL_READ_SUPPORTED
 #define PNG_SETJMP_SUPPORTED
-#define PNG_SET_OPTION_SUPPORTED
 #define PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
 #define PNG_SET_USER_LIMITS_SUPPORTED
 #define PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
@@ -184,29 +203,4 @@
 #define PNG_tRNS_SUPPORTED
 #define PNG_zTXt_SUPPORTED
 /* end of options */
-/* settings */
-#define PNG_ABORT { (abort()); }
-#define PNG_API_RULE 0
-#define PNG_CALLOC_SUPPORTED
-#define PNG_COST_SHIFT 3
-#define PNG_DEFAULT_READ_MACROS 1
-#define PNG_GAMMA_THRESHOLD_FIXED 5000
-#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
-#define PNG_INFLATE_BUF_SIZE 1024
-#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_TEXT_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_TEXT_Z_DEFAULT_STRATEGY 0
-#define PNG_WEIGHT_SHIFT 8
-#define PNG_ZLIB_VERNUM 0 /* unknown */
-#define PNG_ZBUF_SIZE 8192
-#define PNG_ZLIB_HEADER <zlib.h>
-#define PNG_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
-#define PNG_Z_DEFAULT_STRATEGY 1
-#define PNG_sCAL_PRECISION 5
-#define PNG_sRGB_PROFILE_CHECKS 2
-/* end of settings */
 #endif /* PNGLCONF_H */

scripts/pngtests

@@ -0,0 +1,39 @@
+makefile.32sunu
+makefile.64sunu
+makefile.acorn
+makefile.aix
+makefile.amiga
+makefile.atari
+makefile.bc32
+makefile.beos
+makefile.bor
+makefile.darwin
+makefile.dec
+makefile.dj2
+makefile.elf
+makefile.freebsd
+makefile.gcc
+makefile.hp64
+makefile.hpgcc
+makefile.hpux
+makefile.ibmc
+makefile.intel
+makefile.knr
+makefile.linux
+makefile.mips
+makefile.msc
+makefile.msys
+makefile.ne12bsd
+makefile.netbsd
+makefile.openbsd
+makefile.sco
+makefile.sggcc
+makefile.sgi
+makefile.so9
+makefile.solaris
+makefile.solaris-x86
+makefile.std
+makefile.sunos
+makefile.tc3
+makefile.vcwin32
+makevms.com

scripts/symbols.def

@@ -1,4 +1,3 @@
-;Version 1.7.0beta13
 ;--------------------------------------------------------------
 ; LIBPNG symbol list as a Win32 DEF file
 ; Contains all the symbols that can be exported from libpng
@@ -6,6 +5,7 @@
 LIBRARY
 
 EXPORTS
+;Version 1.7.0beta04
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3
@@ -242,4 +242,3 @@ EXPORTS
  png_convert_to_rfc1123_buffer @241
  png_set_check_for_invalid_index @242
  png_get_palette_max @243
- png_set_option @244

scripts/symbols.dfn

@@ -35,14 +35,13 @@
  * defaulted to 'off' in scripts/pnglibconf.dfa
  *
  * Maintenance: if scripts/pnglibconf.dfa options are changed
- * from, or to, 'disabled' this needs updating!
+ * from, or to, 'off' this needs updating!
  */
 #define PNG_BENIGN_ERRORS_SUPPORTED
 #define PNG_ERROR_NUMBERS_SUPPORTED
 #define PNG_READ_BIG_ENDIAN_SUPPORTED  /* should do nothing! */
 #define PNG_INCH_CONVERSIONS_SUPPORTED
 #define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
-#define PNG_SET_OPTION_SUPPORTED
 
 #undef PNG_H
 #include "../png.h"

scripts/zlibs

@@ -0,0 +1,24 @@
+makefile.32sunu
+makefile.64sunu
+makefile.aix
+makefile.beos
+makefile.darwin
+makefile.dec
+makefile.elf
+makefile.freebsd
+makefile.gcc
+makefile.hp64
+makefile.hpgcc
+makefile.hpux
+makefile.ibmc
+makefile.intel
+makefile.linux
+makefile.msys
+makefile.sco
+makefile.sggcc
+makefile.sgi
+makefile.so9
+makefile.solaris
+makefile.solaris-x86
+makefile.std
+makefile.sunos