[libpng10] Imported from libpng-1.0.13.tar

2025-07-10 18:04:09 +02:00 · 2011-09-03 12:23:02 -05:00
266 changed files with 35140 additions and 103678 deletions
--- a/74
+++ b/74
@@ -1,39 +1,51 @@
-Libpng 1.5.26 - December 17, 2015
+Libpng 1.0.13 - April 15, 2002
 This is a public release of libpng, intended for use in production codes.
-Files available for download:
+Changes since the last public release (1.2.1):
-Source files with LF line endings (for Unix/Linux) and with a
+  Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
-"configure" script
+  Revised makefile.linux, makefile.gcmmx, and others to generate
    libpng.a, libpngNN.so, libpng.so.NN, and libpngNN/png.h
  Revised makefile.darwin to remove "-undefined suppress" option.
  Added checks for gamma and chromaticity values over 21474.83, which exceed
    the limit for PNG unsigned 32-bit integers when encoded.
  Revised calls to png_create_read_struct() and png_create_write_struct()
    for simpler debugging.
  Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
  Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
  Check for invalid image dimensions in png_get_IHDR.
  Added install-shared and install-static targets to all makefiles that make
    shared libraries.
  Always do gamma compensation when image is partially transparent.
  Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
  Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
  Removed unused png_write_destroy_info prototype from png.h
  Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
  Stopped a double free of palette, hist, and trans when not using free_me.
  Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
  Compute background.gray and background_1.gray even when color_type is RGB
    in case image gets reduced to gray later (Jason Summers).
  Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
  Added missing PNGAPI to several function definitions.
  Check for invalid bit_depth or color_type in png_get_IHDR(), and
    check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
  Revised iTXt support to accept NULL for lang and lang_key.
  Compute gamma for color components of background even when color_type is gray.
  Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
  Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
  Prevent png_zalloc() from trying to memset memory that it failed to acquire.
  Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
  Ensure that the right function (user or default) is used to free the
    png_struct after an error in png_create_read_struct_2().
  Save the ebx register in pnggccrd.c (Sami Farin)
  Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
  Updated makefiles to put headers in include/libpng and remove old include/*.h.
  Revised description of png_set_filter() in libpng.3/libpng.txt.
  Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
-   libpng-1.5.26.tar.xz (LZMA-compressed, recommended)
+Send comments/corrections/commendations to
-   libpng-1.5.26.tar.gz
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
 Source files with CRLF line endings (for Windows), without the
 "configure" script
   lpng1526.7z  (LZMA-compressed, recommended)
   lpng1526.zip
 Other information:
   libpng-1.5.26-README.txt
   libpng-1.5.26-LICENSE.txt
   libpng-1.5.26-*.asc (armored detached GPG signatures)
 Changes since the last public release (1.5.25):
  Fixed an out-of-range read in png_check_keyword() (Bug report from
    Qixue Xiao, CVE-2015-8540).
  Corrected copyright dates in source files.
  Moved png_check_keyword() from pngwutil.c to pngset.c
  Added keyword checks to pngset.c (John Bowler).
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 to subscribe)
 or to glennrp at users.sourceforge.net
 Glenn R-P
--- a/4017
+++ b/4017
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,337 +0,0 @@
 # CMakeLists.txt
 # Copyright (C) 2007-2015 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
 cmake_minimum_required(VERSION 2.4.4)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
 set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")
 project(libpng C)
 enable_testing()
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
 set(PNGLIB_RELEASE 26)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 # needed packages
 find_package(ZLIB REQUIRED)
 include_directories(${ZLIB_INCLUDE_DIR})
 if(NOT WIN32)
  find_library(M_LIBRARY
    NAMES m
    PATHS /usr/lib /usr/local/lib
  )
  if(NOT M_LIBRARY)
    message(STATUS "math lib 'libm' not found; floating point support disabled")
  endif()
 else()
  # not needed on windows
  set(M_LIBRARY "")
 endif()
 # COMMAND LINE OPTIONS
 option(PNG_SHARED "Build shared lib" ON)
 option(PNG_STATIC "Build static lib" ON)
 option(PNG_TESTS  "Build libpng tests" ON)
 # Many more configuration options could be added here
 option(PNG_FRAMEWORK "Build OS X framework" OFF)
 option(PNG_DEBUG     "Build with debug output" OFF)
 option(PNGARG        "Disable ANSI-C prototypes" OFF)
 # SET LIBNAME
 set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")
 # Use the prebuilt pnglibconf.h file from the scripts folder
 # TODO: fix this by building with awk; without this no cmake build can be
 # configured directly (to do so indirectly use your local awk to build a
 # pnglibconf.h in the build directory.)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
               ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 # OUR SOURCES
 set(libpng_public_hdrs
  png.h
  pngconf.h
  ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h
 )
 set(libpng_sources
  ${libpng_public_hdrs}
  pngdebug.h
  pnginfo.h
  pngpriv.h
  pngstruct.h
  png.c
  pngerror.c
  pngget.c
  pngmem.c
  pngpread.c
  pngread.c
  pngrio.c
  pngrtran.c
  pngrutil.c
  pngset.c
  pngtrans.c
  pngwio.c
  pngwrite.c
  pngwtran.c
  pngwutil.c
 )
 set(pngtest_sources
  pngtest.c
 )
 set(pngvalid_sources
  contrib/libtests/pngvalid.c
 )
 # SOME NEEDED DEFINITIONS
 if(MSVC)
  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)
 if(PNG_DEBUG)
  add_definitions(-DPNG_DEBUG)
 endif()
 # NOW BUILD OUR TARGET
 include_directories(${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")
    set_target_properties(${PNG_LIB_NAME} PROPERTIES IMPORT_PREFIX "lib")
  endif()
  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
 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")
  endif()
  target_link_libraries(${PNG_LIB_NAME_STATIC} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
 if(PNG_FRAMEWORK)
  set(PNG_LIB_NAME_FRAMEWORK ${PNG_LIB_NAME}_framework)
  add_library(${PNG_LIB_NAME_FRAMEWORK} SHARED ${libpng_sources})
  list(APPEND PNG_LIB_TARGETS ${PNG_LIB_NAME_FRAMEWORK})
  set_target_properties(${PNG_LIB_NAME_FRAMEWORK} PROPERTIES
    FRAMEWORK TRUE
    FRAMEWORK_VERSION ${PNGLIB_VERSION}
    MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
    MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
    MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
    XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
    PUBLIC_HEADER "${libpng_public_hdrs}"
    OUTPUT_NAME png)
  target_link_libraries(${PNG_LIB_NAME_FRAMEWORK} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
 if(NOT PNG_LIB_TARGETS)
  message(SEND_ERROR
    "No library variant selected to build. "
    "Please enable at least one of the following options: "
    " PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
 endif()
 if(PNG_SHARED AND WIN32)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
 endif()
 if(PNG_TESTS AND PNG_SHARED)
  # does not work with msvc due to png_lib_ver issue
  add_executable(pngtest ${pngtest_sources})
  target_link_libraries(pngtest ${PNG_LIB_NAME})
  add_test(pngtest ./pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
  #
  add_executable(pngvalid ${pngvalid_sources})
  target_link_libraries(pngvalid ${PNG_LIB_NAME})
  add_test(pngvalid ./pngvalid)
 endif()
 # Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set
 IF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
  SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "lib")
 ENDIF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
 # Set a variable with CMake code which:
 # Creates a symlink from src to dest (if possible) or alternatively
 # copies if different.
 macro(CREATE_SYMLINK SRC_FILE DEST_FILE)
  FILE(REMOVE ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${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 ${PNG_LIB_TARGETS}
        )
    ADD_CUSTOM_TARGET(${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 make_directory ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
    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})
  endif(WIN32 AND NOT CYGWIN AND NOT MSYS)
 endmacro()
 # libpng is a library so default to 'lib'
 if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
  set(CMAKE_INSTALL_LIBDIR lib)
 endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
 # CREATE PKGCONFIG FILES
 # we use the same files like ./configure, so we have to set its vars
 # Only do this on Windows for Cygwin - the files don't make much sense outside
 # a UNIX look alike
 if(NOT WIN32 OR CYGWIN OR MINGW)
  set(prefix      ${CMAKE_INSTALL_PREFIX})
  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
  set(libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
  set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
  set(LIBS        "-lz -lm")
  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
  CREATE_SYMLINK(${PNGLIB_NAME}.pc libpng.pc)
  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
  CREATE_SYMLINK(${PNGLIB_NAME}-config libpng-config)
 endif(NOT WIN32 OR CYGWIN OR MINGW)
 # SET UP LINKS
 if(PNG_SHARED)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES
 #   VERSION 15.${PNGLIB_RELEASE}.1.5.26
    VERSION 15.${PNGLIB_RELEASE}.0
    SOVERSION 15
    CLEAN_DIRECT_OUTPUT 1)
 endif()
 if(PNG_STATIC)
  # MSVC doesn't use a different file extension for shared vs. static
  # libs.  We are able to change OUTPUT_NAME to remove the _static
  # for all other platforms.
  if(NOT MSVC)
    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
      OUTPUT_NAME ${PNG_LIB_NAME}
      CLEAN_DIRECT_OUTPUT 1)
  endif()
 endif()
 # If CMake > 2.4.x, we set a variable used below to export
 # targets to an export file.
 # TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
 if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
  set(PNG_EXPORT_RULE EXPORT libpng)
 elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
  set(PNG_EXPORT_RULE EXPORT libpng)
 endif()
 # INSTALL
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
  install(TARGETS ${PNG_LIB_TARGETS}
      ${PNG_EXPORT_RULE}
      RUNTIME DESTINATION bin
      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
      FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
  if(PNG_SHARED)
    # Create a symlink for libpng.dll.a => libpng15.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})
       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})
      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
         DESTINATION ${CMAKE_INSTALL_LIBDIR})
    endif(NOT WIN32)
  endif(PNG_SHARED)
  if(PNG_STATIC)
    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})
      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
         DESTINATION ${CMAKE_INSTALL_LIBDIR})
    endif(NOT WIN32 OR CYGWIN OR MINGW)
 endif()
 endif()
 if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
  install(FILES ${libpng_public_hdrs}   DESTINATION include)
  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
 endif()
 if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
  if(NOT WIN32 OR CYGWIN OR MINGW)
    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
            DESTINATION bin)
  endif(NOT WIN32 OR CYGWIN OR MINGW)
 endif()
 if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
  # Install man pages
  if(NOT PNG_MAN_DIR)
    set(PNG_MAN_DIR "share/man")
  endif()
  install(FILES libpng.3 libpngpf.3      DESTINATION ${PNG_MAN_DIR}/man3)
  install(FILES png.5                    DESTINATION ${PNG_MAN_DIR}/man5)
  # Install pkg-config files
  if(NOT WIN32 OR CYGWIN OR MINGW)
    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
            DESTINATION bin)
    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
            DESTINATION bin)
  endif(NOT WIN32 OR CYGWIN OR MINGW)
 endif()
 # On versions of CMake that support it, create an export file CMake
 # users can include() to import our targets
 if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
  install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
 endif()
 # what's with libpng-manual.txt and all the extra files?
 # UNINSTALL
 # do we need this?
 # DIST
 # do we need this?
 # to create msvc import lib for mingw compiled shared lib
 # pexports libpng.dll > libpng.def
 # lib /def:libpng.def /machine:x86
--- a/448
+++ b/448
@@ -1,114 +1,17 @@
-Installing libpng
+Installing libpng version 1.0.13 - April 15, 2002
-Contents
+Before installing libpng, you must first install zlib.  zlib
-
+can usually be found wherever you got libpng.  zlib can be
-   I. Simple installation
+placed in another directory, at the same level as libpng.
-  II. Rebuilding the configure scripts
+Note that your system might already have a preinstalled
- III. Using scripts/makefile*
+zlib, but you will still need to have access to the
-  IV. Using cmake
+zlib.h and zconf.h include files that correspond to the
-   V. Directory structure
+version of zlib that's installed.
  VI. Building with project files
 VII. Building with makefiles
 VIII. Configuring libpng for 16-bit platforms
  IX. Configuring for DOS
   X. Configuring for Medium Model
  XI. Omitted
 XII. Configuring for compiler xxx:
 XIII. Removing unwanted object code
 XIV. Changes to the build and configuration of libpng in libpng-1.5.x
  XV. Configuring libpng for multiprocessing
 XVI. Other sources of information about libpng
 I. Simple installation
 On Unix/Linux and similar systems, you can simply type
    ./configure [--prefix=/path]
    make check
    make install
 and ignore the rest of this document.  "/path" is the path to the directory
 where you want to install the libpng "lib", "include", and "bin"
 subdirectories.
 Note that "configure" is only included in the "*.tar" distributions and not
 in the "*.zip" or "*.7z" distributions. If you downloaded one of those
 distributions, see "Building with project files" or "Building with makefiles",
 below.
 II. Rebuilding the configure scripts
 If configure does not work on your system, or if you have a need to
 change configure.ac or Makefile.am, and you have a reasonably
 up-to-date set of tools, running ./autogen.sh in a git clone before
 running ./configure may fix the problem.  To be really sure that you
 aren't using any of the included pre-built scripts, you can do this:
    ./configure --enable-maintainer-mode
    make maintainer-clean
    ./autogen.sh --maintainer --clean
    ./autogen.sh --maintainer
    ./configure [--prefix=/path] [other options]
    make
    make install
    make check
 III. Using scripts/makefile*
 Instead, you can use one of the custom-built makefiles in the
 "scripts" directory
    cp scripts/pnglibconf.h.prebuilt pnglibconf.h
    cp scripts/makefile.system makefile
    make test
    make install
 The files that are presently available in the scripts directory
 are listed and described in scripts/README.txt.
 Or you can use one of the "projects" in the "projects" directory.
 Before installing libpng, you must first install zlib, if it
 is not already on your system.  zlib can usually be found
 wherever you got libpng; otherwise go to http://zlib.net.  You can place
 zlib in in the same directory as libpng or in another directory.
 If your system already has a preinstalled zlib you will still need
 to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.
 If you wish to test with a particular zlib that is not first in the
 standard library search path, put ZLIBLIB, ZLIBINC, CPPFLAGS, LDFLAGS,
 and LD_LIBRARY_PATH in your environment before running "make test"
 or "make distcheck":
 ZLIBLIB=/path/to/lib export ZLIBLIB
 ZLIBINC=/path/to/include export ZLIBINC
 CPPFLAGS="-I$ZLIBINC" export CPPFLAGS
 LDFLAGS="-L$ZLIBLIB" export LDFLAGS
 LD_LIBRARY_PATH="$ZLIBLIB:$LD_LIBRARY_PATH" export LD_LIBRARY_PATH
 If you are using one of the makefile scripts, put ZLIBLIB and ZLIBINC
 in your environment and type "make ZLIBLIB=$ZLIBLIB ZLIBINC=$ZLIBINC test".
 IV. Using cmake
 If you want to use "cmake" (see www.cmake.org), type
   cmake . -DCMAKE_INSTALL_PREFIX=/path
   make
   make install
 As when using the simple configure method described above, "/path" points to
 the installation directory where you want to put the libpng "lib", "include",
 and "bin" subdirectories.
 V. Directory structure
 You can rename the directories that you downloaded (they
-might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.8"
+might be called "libpng-1.0.13" or "lpng109" and "zlib-1.1.3"
-or "zlib128") so that you have directories called "zlib" and "libpng".
+or "zlib113") so that you have directories called "zlib" and "libpng".
 Your directory structure should look like this:
@@ -116,273 +19,128 @@ Your directory structure should look like this:
      libpng  (this directory)
          INSTALL (this file)
          README
-          *.h, *.c  => libpng source files
+          *.h
-          CMakeLists.txt    =>  "cmake" script
+          *.c
          configuration files:
             configure.ac, configure, Makefile.am, Makefile.in,
             autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
             libpng-config.in, aclocal.m4, config.h.in, config.sub,
             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
          contrib
-             gregbook, libtests, pngminim, pngminus, pngsuite, visupng
+             gregbook
             msvctest
             pngminus
             pngsuite
             visupng
          projects
-             cbuilder5, owatcom, visualc71, vstudio, xcode
+             beos
             borland
             msvc
             netware.txt
             wince.txt
          scripts
             makefile.*
             *.def (module definition files)
             etc.
          pngtest.png
          etc.
      zlib
-          README, *.h, *.c contrib, etc.
+          README
          *.h
          *.c
          contrib
          etc.
 If the line endings in the files look funny, you may wish to get the other
 distribution of libpng.  It is available in both tar.gz (UNIX style line
 endings) and zip (DOS style line endings) formats.
-VI. Building with project files
+If you are building libpng with MSVC, you can enter the libpng\msvc directory
 and follow the instructions in msvc\README.txt.
-If you are building libpng with MSVC, you can enter the
+You can build libpng for WindowsCE by entering the downloading and installing
-libpng projects\visualc71 or vstudio directory and follow the instructions
+the libpng\wince directory as instructed in the projects\wince.txt file, and
-in README.txt.
+then following the instructions in the README* files.  Similarly, you can
 build libpng for Netware as instructed in projects\netware.txt.
-Otherwise enter the zlib directory and follow the instructions in zlib/README,
+Else enter the zlib directory and follow the instructions in zlib/README,
-then come back here and run "configure" or choose the appropriate
+then come back here and choose the appropriate makefile.sys in the scripts
-makefile.sys in the scripts directory.
+directory.
-VII. Building with makefiles
+The files that are presently available in the scripts directory
 include
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng10.so.0.1.0.13)
 makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng10.so.0.1.0.13,
                       uses assembler code tuned for Intel MMX platform)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.knr      =>  Archaic UNIX Makefile that converts files with
                       ansi2knr (Requires ansi2knr.c from
                       ftp://ftp.cs.wisc.edu/ghost)
 makefile.aix      =>  AIX makefile
 makefile.cygwin   =>  Cygwin/gcc makefile
 makefile.darwin   =>  Darwin makefile
 makefile.dec      =>  DEC Alpha UNIX makefile
 makefile.hpgcc    =>  HPUX makefile using gcc
 makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
 makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
 makefile.intel    =>  Intel C/C++ version 4.0 and later
 libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
 makefile.macosx   =>  MACOS X Makefile
 makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD
 makefile.openbsd  =>  OpenBSD makefile
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng10.so.0.1.0.13)
 makefile.sunos    =>  Sun makefile
 makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng10.so.0.1.0.13)
 makefile.so9      =>  Solaris 9 makefile (gcc, creates libpng10.so.0.1.0.13)
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
 makefile.64sunu   =>  Sun Ultra 64-bit makefile
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.mips     =>  MIPS makefile
 makefile.acorn    =>  Acorn makefile
 makefile.amiga    =>  Amiga makefile
 smakefile.ppc     =>  AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
                       (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
 makefile.atari    =>  Atari makefile
 makefile.beos     =>  BEOS makefile for X86
 makefile.bor      =>  Borland makefile (uses bcc)
 makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
 makefile.bd32     =>  To make a png32bd.dll with Borland C++ 4.5
 makefile.tc3      =>  Turbo C 3.0 makefile
 makefile.dj2      =>  DJGPP 2 makefile
 makefile.msc      =>  Microsoft C makefile
 makefile.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses
                       assembler code tuned for Intel MMX platform)
 makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does
                       not use assembler code)
 makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
 pngos2.def        =>  OS/2 module definition file used by makefile.os2
 makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
 makevms.com       =>  VMS build script
 descrip.mms       =>  VMS makefile for MMS or MMK
 pngdef.pas        =>  Defines for a png32bd.dll with Borland C++ 4.5
 SCOPTIONS.ppc     =>  Used with smakefile.ppc
 Copy the file (or files) that you need from the
 scripts directory into this directory, for example
   MSDOS example: copy scripts\makefile.msc makefile
-                  copy scripts\pnglibconf.h.prebuilt pnglibconf.h
+   UNIX example:    cp scripts/makefile.std makefile
   UNIX example:  cp scripts/makefile.std makefile
                  cp scripts/pnglibconf.h.prebuilt pnglibconf.h
 Read the makefile to see if you need to change any source or
 target directories to match your preferences.
-Then read pnglibconf.dfa to see if you want to make any configuration
+Then read pngconf.h to see if you want to make any configuration
 changes.
-Then just run "make" which will create the libpng library in
+Then just run "make test" which will create the libpng library in
-this directory and "make test" which will run a quick test that reads
+this directory and run a quick test that reads the "pngtest.png"
-the "pngtest.png" file and writes a "pngout.png" file that should be
+file and writes a "pngout.png" file that should be identical to it.
-identical to it.  Look for "9782 zero samples" in the output of the
+Look for "9782 zero samples" in the output of the test.  For more
-test.  For more confidence, you can run another test by typing
+confidence, you can run another test by typing "pngtest pngnow.png"
-"pngtest pngnow.png" and looking for "289 zero samples" in the output.
+and looking for "289 zero samples" in the output.  Also, you can
-Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
+run "pngtest -m *.png" in the "contrib/pngsuite" directory and compare
 your output with the result shown in contrib/pngsuite/README.
 Most of the makefiles will allow you to run "make install" to
 put the library in its final resting place (if you want to
 do that, run "make install" in the zlib directory first if necessary).
 Some also allow you to run "make test-installed" after you have
 run "make install".
 VIII. Configuring libpng for 16-bit platforms
 You will want to look into zconf.h to tell zlib (and thus libpng) that
 it cannot allocate more than 64K at a time.  Even if you can, the memory
 won't be accessible.  So limit zlib and libpng to 64K by defining MAXSEG_64K.
 IX. Configuring for DOS
 For DOS users who only have access to the lower 640K, you will
 have to limit zlib's memory usage via a png_set_compression_mem_level()
 call.  See zlib.h or zconf.h in the zlib library for more information.
 X. Configuring for Medium Model
 Libpng's support for medium model has been tested on most of the popular
 compilers.  Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
 defined, and FAR gets defined to far in pngconf.h, and you should be
 all set.  Everything in the library (except for zlib's structure) is
 expecting far data.  You must use the typedefs with the p or pp on
 the end for pointers (or at least look at them and be careful).  Make
 note that the rows of data are defined as png_bytepp, which is
 an "unsigned char far * far *".
 XI. Omitted
 XII. Configuring for compiler xxx:
 All includes for libpng are in pngconf.h.  If you need to add, change
 or delete an include, this is the place to do it.
 The includes that are not needed outside libpng are placed in pngpriv.h,
 which is only used by the routines inside libpng itself.
 The files in libpng proper only include pngpriv.h and png.h, which
 in turn includes pngconf.h and, as of libpng-1.5.0, pnglibconf.h.
 As of libpng-1.5.0, pngpriv.h also includes three other private header
 files, pngstruct.h, pnginfo.h, and pngdebug.h, which contain material
 that previously appeared in the public headers.
 XIII. Removing unwanted object code
 There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
 never going to use a capability, you can change the #define to #undef
 before recompiling libpng and save yourself code and data space, or
 you can turn off individual capabilities with defines that begin with
 PNG_NO_.
 In libpng-1.5.0 and later, the #define's are in pnglibconf.h instead.
 You can also turn all of the transforms and ancillary chunk capabilities
 off en masse with compiler directives that define
 PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
 or all four, along with directives to turn on any of the capabilities that
 you do want.  The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable the
 extra transformations but still leave the library fully capable of reading
 and writing PNG files with all known public chunks. Use of the
 PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive produces a library
 that is incapable of reading or writing ancillary chunks.  If you are
 not using the progressive reading capability, you can turn that off
 with PNG_NO_PROGRESSIVE_READ (don't confuse this with the INTERLACING
 capability, which you'll still have).
 All the reading and writing specific code are in separate files, so the
 linker should only grab the files it needs.  However, if you want to
 make sure, or if you are building a stand alone library, all the
 reading files start with "pngr" and all the writing files start with "pngw".
 The files that don't match either (like png.c, pngtrans.c, etc.)
 are used for both reading and writing, and always need to be included.
 The progressive reader is in pngpread.c
 If you are creating or distributing a dynamically linked library (a .so
 or DLL file), you should not remove or disable any parts of the library,
 as this will cause applications linked with different versions of the
 library to fail if they call functions not available in your library.
 The size of the library itself should not be an issue, because only
 those sections that are actually used will be loaded into memory.
 XIV. Changes to the build and configuration of libpng in libpng-1.5.x
 Details of internal changes to the library code can be found in the CHANGES
 file and in the GIT repository logs.  These will be of no concern to the vast
 majority of library users or builders; however, the few who configure libpng
 to a non-default feature set may need to change how this is done.
 There should be no need for library builders to alter build scripts if
 these use the distributed build support - configure or the makefiles -
 however, users of the makefiles may care to update their build scripts
 to build pnglibconf.h where the corresponding makefile does not do so.
 Building libpng with a non-default configuration has changed completely.
 The old method using pngusr.h should still work correctly even though the
 way pngusr.h is used in the build has been changed; however, library
 builders will probably want to examine the changes to take advantage of
 new capabilities and to simplify their build system.
 A. Specific changes to library configuration capabilities
 The exact mechanism used to control attributes of API functions has
 changed.  A single set of operating system independent macro definitions
 is used and operating system specific directives are defined in
 pnglibconf.h
 As part of this the mechanism used to choose procedure call standards on
 those systems that allow a choice has been changed.  At present this only
 affects certain Microsoft (DOS, Windows) and IBM (OS/2) operating systems
 running on Intel processors.  As before, PNGAPI is defined where required
 to control the exported API functions; however, two new macros, PNGCBAPI
 and PNGCAPI, are used instead for callback functions (PNGCBAPI) and
 (PNGCAPI) for functions that must match a C library prototype (currently
 only png_longjmp_ptr, which must match the C longjmp function.)  The new
 approach is documented in pngconf.h
 Despite these changes, libpng 1.5.0 only supports the native C function
 calling standard on those platforms tested so far (__cdecl on Microsoft
 Windows).  This is because the support requirements for alternative
 calling conventions seem to no longer exist.  Developers who find it
 necessary to set PNG_API_RULE to 1 should advise the mailing list
 (png-mng-implement) of this and library builders who use Openwatcom and
 therefore set PNG_API_RULE to 2 should also contact the mailing list.
 B. Changes to the configuration mechanism
 Prior to libpng-1.5.0 library builders who needed to configure libpng
 had either to modify the exported pngconf.h header file to add system
 specific configuration or had to write feature selection macros into
 pngusr.h and cause this to be included into pngconf.h by defining
 PNG_USER_CONFIG. The latter mechanism had the disadvantage that an
 application built without PNG_USER_CONFIG defined would see the
 unmodified, default, libpng API and thus would probably fail to link.
 These mechanisms still work in the configure build and in any makefile
 build that builds pnglibconf.h, although the feature selection macros
 have changed somewhat as described above.  In 1.5.0, however, pngusr.h is
 processed only once, at the time the exported header file pnglibconf.h is
 built.  pngconf.h no longer includes pngusr.h; therefore, pngusr.h is ignored
 after the build of pnglibconf.h and it is never included in an application
 build.
 The formerly used alternative of adding a list of feature macros to the
 CPPFLAGS setting in the build also still works; however, the macros will be
 copied to pnglibconf.h and this may produce macro redefinition warnings
 when the individual C files are compiled.
 All configuration now only works if pnglibconf.h is built from
 scripts/pnglibconf.dfa.  This requires the program awk.  Brian Kernighan
 (the original author of awk) maintains C source code of that awk and this
 and all known later implementations (often called by subtly different
 names - nawk and gawk for example) are adequate to build pnglibconf.h.
 The Sun Microsystems (now Oracle) program 'awk' is an earlier version
 and does not work; this may also apply to other systems that have a
 functioning awk called 'nawk'.
 Configuration options are now documented in scripts/pnglibconf.dfa.  This
 file also includes dependency information that ensures a configuration is
 consistent; that is, if a feature is switched off, dependent features are
 also switched off.  As a recommended alternative to using feature macros in
 pngusr.h a system builder may also define equivalent options in pngusr.dfa
 (or, indeed, any file) and add that to the configuration by setting
 DFA_XTRA to the file name.  The makefiles in contrib/pngminim illustrate
 how to do this, and also illustrate a case where pngusr.h is still required.
 After you have built libpng, the definitions that were recorded in
 pnglibconf.h are available to your application (pnglibconf.h is included
 in png.h and gets installed alongside png.h and pngconf.h in your
 $PREFIX/include directory).  Do not edit pnglibconf.h after you have built
 libpng, because than the settings would not accurately reflect the settings
 that were used to build libpng.
 XV. Configuring libpng for multiprocessing
 Libpng uses setjmp()/longjmp() for error handling.  Unfortunately setjmp()
 is known to be not thread-safe on some platforms and we don't know of
 any platform where it is guaranteed to be thread-safe.  Therefore, if
 your application is going to be using multiple threads, you should
 configure libpng with PNG_NO_SETJMP in your pngusr.dfa file, with
 -DPNG_NO_SETJMP on your compile line, or with
  #undef PNG_SETJMP_SUPPORTED
 in your pnglibconf.h or pngusr.h.
 XVI. Other sources of information about libpng:
 Further information can be found in the README and libpng-manual.txt
 files, in the individual makefiles, in png.h, and the manual pages
 libpng.3 and png.5.
 Using the ./configure script -- 16 December 2002.
 =================================================
 The ./configure script should work compatibly with what scripts/makefile.*
 did, however there are some options you might need to add to configure
 explicitly, which previously was done semi-automatically (if you didn't edit
 scripts/makefile.* yourself, that is)
 CFLAGS="-Wall -O -funroll-loops \
 -malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
 --with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
 You can alternatively specify --includedir=/usr/include, /usr/local/include,
 /usr/include/libpng15, or whatever.
 If you find that the configure script is out-of-date or is not supporting
 your platform properly, try running autogen.sh to regenerate "configure",
 "Makefile.in", and the other configuration files. Then try configure again.
 Further information can be found in the README and libpng.txt
 files, in the individual makefiles, in png.h, in the README files in
 subdirectories of the LIB directory, and the manual pages libpng.3 and png.5.
--- a/9
+++ b/9
@@ -0,0 +1,9 @@
 Known bugs in libpng version 1.0.13
 1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
   reading interlaced PNG files, when assembler code is enabled.
   STATUS: Under investigation.  The change to pnggccrd.c in libpng-1.2.1
   fixed a problem under FreeBSD but not the problem with NetBSD.
--- a/51
+++ b/51
@@ -8,18 +8,13 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.
-This code is released under the libpng license.
+libpng versions 1.0.7, July 1, 2000, through 1.0.13, April 15, 2002, are
-
+Copyright (c) 2000-2002 Glenn Randers-Pehrson
-libpng versions 1.0.7, July 1, 2000, through 1.5.26, December 17, 2015, are
+and are distributed according to the same disclaimer and license as libpng-1.0.6
-Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson, are
+with the following individuals added to the list of Contributing Authors
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
 added to the list of Contributing Authors:
   Simon-Pierre Cadieux
   Eric S. Raymond
   Mans Rullgard
   Cosmin Truta
   Gilles Vollant
 and with the following additions to the disclaimer:
@@ -32,20 +27,18 @@ and with the following additions to the disclaimer:
   the user.
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
-Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
+Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
-libpng-0.96, and are distributed according to the same disclaimer and
+distributed according to the same disclaimer and license as libpng-0.96,
-license as libpng-0.96, with the following individuals added to the list
+with the following individuals added to the list of Contributing Authors:
 of Contributing Authors:
   Tom Lane
   Glenn Randers-Pehrson
   Willem van Schaik
 libpng versions 0.89, June 1996, through 0.96, May 1997, are
-Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
+Copyright (c) 1996, 1997 Andreas Dilger
-and are distributed according to the same disclaimer and license as
+Distributed according to the same disclaimer and license as libpng-0.88,
-libpng-0.88, with the following individuals added to the list of
+with the following individuals added to the list of Contributing Authors:
 Contributing Authors:
   John Bowler
   Kevin Bracey
@@ -55,7 +48,7 @@ Contributing Authors:
   Tom Tanner
 libpng versions 0.5, May 1995, through 0.88, January 1996, are
-Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:
@@ -78,13 +71,13 @@ Permission is hereby granted to use, copy, modify, and distribute this
 source code, or portions hereof, for any purpose, without fee, subject
 to the following restrictions:
-  1. The origin of this source code must not be misrepresented.
+1. The origin of this source code must not be misrepresented.
-  2. Altered versions must be plainly marked as such and must not
+2. Altered versions must be plainly marked as such and must not
-     be misrepresented as being the original source.
+   be misrepresented as being the original source.
-  3. This Copyright notice may not be removed or altered from any
+3. This Copyright notice may not be removed or altered from any
-     source or altered source distribution.
+   source or altered source distribution.
 The Contributing Authors and Group 42, Inc. specifically permit, without
 fee, and encourage the use of this source code as a component to
@@ -92,20 +85,18 @@ supporting the PNG file format in commercial products.  If you use this
 source code in a product, acknowledgment is not required but would be
 appreciated.
 END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
 A "png_get_copyright" function is available, for convenient use in "about"
 boxes and the like:
-   printf("%s", png_get_copyright(NULL));
+   printf("%s",png_get_copyright(NULL));
 Also, the PNG logo (in PNG format, of course) is supplied in the
 files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
-Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is
+Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
-a certification mark of the Open Source Initiative. OSI has not addressed
+certification mark of the Open Source Initiative.
 the additional disclaimers inserted at version 1.0.7.
 Glenn Randers-Pehrson
-glennrp at users.sourceforge.net
+randeg@alum.rpi.edu
-December 17, 2015
+April 15, 2002
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,270 +0,0 @@
 # Makefile.am:
 #   Source file for Makefile.in (and hence Makefile)
 #
 PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
 # libpng does not follow GNU file name conventions
 # "color-tests" requires automake 1.11.1 or later.  Enable it if you like,
 # to get red "FAIL" and green "PASS" notations during tests.
 # AUTOMAKE_OPTIONS = foreign color-tests
 AUTOMAKE_OPTIONS = foreign
 # test programs - run on make check, make distcheck
 TESTS_ENVIRONMENT= srcdir=$(srcdir)
 check_PROGRAMS= pngtest
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 TESTS = test-pngtest.sh
 # Only do the following if the contrib directory is present.
 check_PROGRAMS+= pngvalid
 pngvalid_SOURCES = contrib/libtests/pngvalid.c
 pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 TESTS += test-pngvalid-simple.sh test-pngvalid-full.sh
 # man pages
 dist_man_MANS= libpng.3 libpngpf.3 png.5
 # generate the -config scripts if required
 binconfigs= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
 EXTRA_SCRIPTS= libpng-config libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
 bin_SCRIPTS= @binconfigs@
 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES=libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
 	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
 	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
 	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
 if PNG_ARM_NEON
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
 	arm/filter_neon.S
 endif
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined -export-dynamic \
 	-version-number @PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0
 if HAVE_LD_VERSION_SCRIPT
 #   Versioned symbols and restricted exports
 if HAVE_SOLARIS_LD
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,-M -Wl,libpng.vers
 else
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,--version-script=libpng.vers
 endif
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.vers
 else
 #   Only restricted exports when possible
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -export-symbols libpng.sym
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
 endif
 #distribute headers in /usr/include/libpng/*
 pkgincludedir= $(includedir)/$(PNGLIB_BASENAME)
 pkginclude_HEADERS= png.h pngconf.h
 nodist_pkginclude_HEADERS= pnglibconf.h
 # pkg-config stuff, note that libpng.pc is always required in order
 # to get the correct library
 pkgconfigdir = @pkgconfigdir@
 pkgconfig_DATA = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc
 #extra source distribution files.
 EXTRA_DIST= \
 	ANNOUNCE CHANGES INSTALL LICENSE README TODO \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
 	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) \
 	CMakeLists.txt example.c libpng-manual.txt
 SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk
 CLEANFILES= dfn.c dfn?.out *.out.? scripts/*.out.? pngout.png \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
 	check.new pnglibconf.h symbols.new pngtest-log.txt \
 	pnglibconf.c pnglibconf.out pnglibconf.pre \
 	$(SCRIPT_CLEANFILES)
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing
 # DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
 # other operating systems (NeXT?) the C preprocessor selected by configure
 # checks input tokens for validity - effectively it performs part of the ANSI-C
 # parsing - and therefore fails with the .df files.  configure.ac has special
 # checks for this and sets DFNCPP appropriately.
 DFNCPP = @DFNCPP@
 SUFFIXES = .chk .out
 $(PNGLIB_BASENAME).pc: libpng.pc
 	cp libpng.pc $@
 $(PNGLIB_BASENAME)-config: libpng-config
 	cp libpng-config $@
 scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
 scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt
 libpng.sym: scripts/sym.out
 	rm -f $@
 	cp $? $@
 libpng.vers: scripts/vers.out
 	rm -f $@
 	cp $? $@
 pnglibconf.h: pnglibconf.out
 	rm -f $@
 	cp $? $@
 $(srcdir)/scripts/pnglibconf.h.prebuilt:
 	@echo "Attempting to build $@" >&2
 	@echo "This is a machine generated file, but if you want to make" >&2
 	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1
 # The following is necessary to ensure that the local pnglibconf.h is used, not
 # an installed one (this can happen immediately after on a clean system if
 # 'make test' is the first thing the user does.)
 contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h
 # We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
 # be built with PNG_USE_READ_MACROS; this prevents the read macros from
 # interfering with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
 		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
 		-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE
 .c.out:
 	rm -f $@ $*.tf[12]
 	test -d scripts || mkdir scripts || test -d scripts
 	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES)\
 	    $(CPPFLAGS) $(SYMBOL_CFLAGS) $< > $*.tf1
 	$(AWK) -f "${srcdir}/scripts/dfn.awk" out="$*.tf2" $*.tf1 1>&2
 	rm -f $*.tf1
 	mv $*.tf2 $@
 # The .c file for pnglibconf.h is machine generated
 pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA)
 	rm -f $@ pnglibconf.pre $@.?
 	$(AWK) -f ${srcdir}/scripts/options.awk out="pnglibconf.pre"\
 	    version=search ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
 	    ${srcdir}/pngusr.dfa $(DFA_XTRA) 1>&2
 	$(AWK) -f ${srcdir}/scripts/options.awk out="$@.1" pnglibconf.pre 1>&2
 	mv $@.1 $@
 # Symbol checks (.def and .out files should match)
 scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
 .out.chk:
 	rm -f $@ symbols.new
 	$(AWK) -f ${srcdir}/scripts/checksym.awk ${srcdir}/scripts/${*F}.def\
 	    $< >&2
 	mv symbols.new $@
 # used on demand to regenerate the standard header, CPPFLAGS should
 # be empty - no non-standard defines
 scripts/pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ dfn?.out
 	test -z "$(CPPFLAGS)"
 	echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
 	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out logunsupported=1\
 		version=search ${srcdir}/pngconf.h -\
 		${srcdir}/scripts/pnglibconf.dfa 1>&2
 	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@
 $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
 	pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h
 test: check-am
 # Extra checks
 check: scripts/symbols.chk
 # Don't distribute the generated script files
 dist-hook:
 	cd '$(top_distdir)'; rm -f $(SCRIPT_CLEANFILES)
 # Make links between installed files with release-specific names and the generic
 # file names.  If this install rule is run the generic names will be deleted and
 # recreated - this has obvious issues for systems with multiple installations.
 install-header-links:
 	@set -ex; cd '$(DESTDIR)$(includedir)'; for f in $(HEADERS); do \
 	   rm -f "$$f"; $(LN_S) "$(PNGLIB_BASENAME)/$$f" "$$f"; done
 uninstall-header-links:
 	cd '$(DESTDIR)$(includedir)'; rm -f $(HEADERS)
 install-libpng-pc:
 	@set -ex; cd '$(DESTDIR)$(pkgconfigdir)'; rm -f libpng.pc; \
 	   $(LN_S) '$(PNGLIB_BASENAME).pc' libpng.pc
 uninstall-libpng-pc:
 	rm -f '$(DESTDIR)$(pkgconfigdir)/libpng.pc'
 # EXT_LIST is a list of the possibly library directory extensions, this exists
 # because we can't find a good way of discovering the file extensions that are
 # actually installed on a given system, so instead we check for every extension
 # we have seen.
 EXT_LIST = a dll.a so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ la sl dylib
 install-library-links:
 	@set -x; cd '$(DESTDIR)$(libdir)';\
 	for ext in $(EXT_LIST); do\
 	   rm -f "libpng.$$ext";\
           if test -f "$(PNGLIB_BASENAME).$$ext"; then\
              $(LN_S) "$(PNGLIB_BASENAME).$$ext" "libpng.$$ext" || exit 1;\
           fi;\
 	done
 uninstall-library-links:
 	@set -x; cd '$(DESTDIR)$(libdir)'; for ext in $(EXT_LIST); do\
 	   rm -f "libpng.$$ext"; done
 install-libpng-config:
 	@set -ex; cd '$(DESTDIR)$(bindir)'; rm -f libpng-config; \
 	   $(LN_S) '$(PNGLIB_BASENAME)-config' libpng-config
 uninstall-libpng-config:
 	rm -f '$(DESTDIR)$(bindir)/libpng-config'
 if DO_INSTALL_LINKS
 # If --enable-unversioned-links is specified the header and lib file links
 # will be automatically made on a 'make install':
 install-data-hook: install-header-links
 uninstall-hook: uninstall-header-links
 install-exec-hook: install-library-links
 uninstall-hook: uninstall-library-links
 endif
 if DO_INSTALL_LIBPNG_PC
 # Likewise, --install-pc causes libpng.pc to be constructed:
 install-data-hook: install-libpng-pc
 uninstall-hook: uninstall-libpng-pc
 endif
 if DO_INSTALL_LIBPNG_CONFIG
 # And --install-config:
 install-exec-hook: install-libpng-config
 uninstall-hook: uninstall-libpng-config
 endif
 # The following addition ensures that 'make all' always builds the test programs
 # too.  It used to, but some change either in libpng or configure stopped this
 # working.
 all-am: $(check_PROGRAMS)
--- a/Makefile.in
+++ b/Makefile.in
--- a/194
+++ b/194
@@ -1,11 +1,11 @@
-README for libpng version 1.5.26 - December 17, 2015 (shared library 15.0)
+README for libpng 1.0.13 - April 15, 2002 (shared library 2.1)
 See the note about version numbers near the top of png.h
 See INSTALL for instructions on how to install libpng.
-Libpng comes in several distribution formats.  Get libpng-*.tar.gz or
+Libpng comes in two distribution formats.  Get libpng-*.tar.gz if you
-libpng-*.tar.xz or if you want UNIX-style line endings in the text files,
+want UNIX-style line endings in the text files, or lpng*.zip if you want
-or lpng*.7z or lpng*.zip if you want DOS-style line endings.
+DOS-style line endings.
 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
@@ -23,25 +23,18 @@ earlier versions if you are using a shared library.  The type of the
 png_uint_32, which will affect shared-library applications that use
 this function.
-To avoid problems with changes to the internals of the png info_struct,
+To avoid problems with changes to the internals of png_info_struct,
 new APIs have been made available in 0.95 to avoid direct application
 access to info_ptr.  These functions are the png_set_<chunk> and
 png_get_<chunk> functions.  These functions should be used when
 accessing/storing the info_struct data, rather than manipulating it
 directly, to avoid such problems in the future.
-It is important to note that the APIs did not make current programs
+It is important to note that the APIs do not make current programs
 that access the info struct directly incompatible with the new
-library, through libpng-1.2.x.  In libpng-1.4.x, which was meant to
+library.  However, it is strongly suggested that new programs use
-be a transitional release, members of the png_struct and the
+the new APIs (as shown in example.c and pngtest.c), and older programs
-info_struct can still be accessed, but the compiler will issue a
+be converted to the new format, to facilitate upgrades in the future.
 warning about deprecated usage.  Since libpng-1.5.0, direct access
 to these structs is not allowed, and the definitions of the structs
 reside in private pngstruct.h and pnginfo.h header files that are not
 accessible to applications.  It is strongly suggested that new
 programs use the new APIs (as shown in example.c and pngtest.c), and
 older programs be converted to the new format, to facilitate upgrades
 in the future.
 ****
 Additions since 0.90 include the ability to compile libpng as a
@@ -61,11 +54,11 @@ to set different actions based on whether the CRC error occurred in a
 critical or an ancillary chunk.
 The changes made to the library, and bugs fixed are based on discussions
-on the PNG-implement mailing list and not on material submitted
+on the PNG implementation mailing list <png-implement@ccrc.wustl.edu>
-privately to Guy, Andreas, or Glenn.  They will forward any good
+and not on material submitted privately to Guy, Andreas, or Glenn.  They will
-suggestions to the list.
+forward any good suggestions to the list.
-For a detailed description on using libpng, read libpng-manual.txt.  For
+For a detailed description on using libpng, read libpng.txt.  For
 examples of libpng in a program, see example.c and pngtest.c.  For usage
 information and restrictions (what little they are) on libpng, see
 png.h.  For a description on using zlib (the compression library used by
@@ -84,21 +77,18 @@ compression library that is useful for more things than just PNG files.
 You can use zlib as a drop-in replacement for fread() and fwrite() if
 you are so inclined.
-zlib should be available at the same place that libpng is, or at zlib.net.
+zlib should be available at the same place that libpng is.
 If not, it should be at ftp.uu.net in /graphics/png
 Eventually, it will be at ftp.uu.net in /pub/archiving/zip/zlib
 You may also want a copy of the PNG specification.  It is available
-as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
+as an RFC and a W3C Recommendation.  Failing
-these at http://www.libpng.org/pub/png/documents/
+these resources you can try ftp.uu.net in the /graphics/png directory.
-This code is currently being archived at libpng.sf.net in the
+This code is currently being archived at ftp.uu.net in the
-[DOWNLOAD] area, and at ftp://ftp.simplesystems.org.  If you can't find it
+/graphics/png directory, and on CompuServe, Lib 20 (PNG SUPPORT)
-in any of those places, e-mail me, and I'll help you find it.
+at GO GRAPHSUP.  If you can't find it in any of those places,
-
+e-mail me, and I'll help you find it.
 I am not a lawyer, but I believe that the Export Control Classification
 Number (ECCN) for libpng is EAR99, which means not subject to export
 controls or International Traffic in Arms Regulations (ITAR) because it
 is open source, publicly available software, that does not contain any
 encryption software.  See the EAR, paragraphs 734.3(b)(3) and 734.7(b).
 If you have any code changes, requests, problems, etc., please e-mail
 them to me.  Also, I'd appreciate any make files or project files,
@@ -112,32 +102,30 @@ Finally, if you get any warning messages when compiling libpng
 fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
 This release was created and will be supported by myself (of course
-based in a large way on Guy's and Andreas' earlier work), and the PNG
+based in a large way on Guy's and Andreas' earlier work), and the PNG group.
 development group.
-Send comments/corrections/commendations to png-mng-implement at
+randeg@alum.rpi.edu
-lists.sourceforge.net (subscription required; visit
+png-implement@ccrc.wustl.edu
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 to subscribe) or to glennrp at users.sourceforge.net
 You can't reach Guy, the original libpng author, at the addresses
-given in previous versions of this document.  He and Andreas will
+given in previous versions of this document.  He and Andreas will read mail
-read mail addressed to the png-implement list, however.
+addressed to the png-implement list, however.
 Please do not send general questions about PNG.  Send them to
-png-mng-misc at lists.sf.net (subscription required; visit
+the address in the specification (png-group@w3.org).  At the same
-https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
+time, please do not send libpng questions to that address, send them to me
-subscribe).  If you have a question about something
+or to png-implement@ccrc.wustl.edu.  I'll
 get them in the end anyway.  If you have a question about something
 in the PNG specification that is related to using libpng, send it
 to me.  Send me any questions that start with "I was using libpng,
 and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for twenty years now, and it is official and
+been discussing PNG for three years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
-gladly listen.  Even if your suggestion is not used immediately,
+gladly listen.  Even if your suggestion is not used for version
-it may be used later.
+1.0, it may be used later.
 Files in this distribution:
@@ -149,17 +137,14 @@ Files in this distribution:
      TODO          =>  Things not implemented in the current library
      Y2KINFO       =>  Statement of Y2K compliance
      example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng (includes libpng-manual.txt)
+      libpng.3      =>  manual page for libpng (includes libpng.txt)
-      libpng-manual.txt  =>  Description of libpng and its functions
+      libpng.txt    =>  Description of libpng and its functions
      libpngpf.3    =>  manual page for libpng's private functions
      png.5         =>  manual page for the PNG format
      png.c         =>  Basic interface functions common to library
-      png.h         =>  Library function and interface declarations (public)
+      png.h         =>  Library function and interface declarations
-      pngpriv.h     =>  Library function and interface declarations (private)
+      pngconf.h     =>  System specific library configuration
-      pngconf.h     =>  System specific library configuration (public)
+      pngasmrd.h    =>  Header file for assembler-coded functions
      pngstruct.h   =>  png_struct declaration (private)
      pnginfo.h     =>  png_info struct declaration (private)
      pngdebug.h    =>  debugging macros (private)
      pngerror.c    =>  Error/warning message I/O functions
      pngget.c      =>  Functions for retrieving info from struct
      pngmem.c      =>  Memory handling functions
@@ -178,36 +163,95 @@ Files in this distribution:
      pngwrite.c    =>  High-level write functions
      pngwtran.c    =>  Write data transformations
      pngwutil.c    =>  Write utility functions
      arm           =>  Contains optimized code for the ARM platform
      contrib       =>  Contributions
       gregbook         =>  source code for PNG reading and writing, from
                            Greg Roelofs' "PNG: The Definitive Guide",
                            O'Reilly, 1999
-       libtests         =>  Test programs
+       msvctest     =>  Builds and runs pngtest using a MSVC workspace
-       pngminim         =>  Minimal decoder, encoder, and progressive decoder
+       pngminus     =>  Simple pnm2png and png2pnm programs
-                            programs demonstrating use of pngusr.dfa
+       pngsuite     =>  Test images
-       pngminus         =>  Simple pnm2png and png2pnm programs
+       visupng      =>  Contains a MSVC workspace for VisualPng
-       pngsuite         =>  Test images
+      projects      =>  Contains project files and workspaces for building DLL
-       visupng          =>  Contains a MSVC workspace for VisualPng
+       beos             =>  Contains a Beos workspace for building libpng
-      projects      =>  Contains project files and workspaces for
+       borland          =>  Contains a Borland workspace for building libpng
-                        building a DLL
+                            and zlib
-       owatcom          =>  Contains a WATCOM project for building libpng
+       msvc             =>  Contains a Microsoft Visual C++ (MSVC) workspace
-       visualc71        =>  Contains a Microsoft Visual C++ (MSVC)
+                            for building libpng and zlib
-                            workspace for building libpng and zlib
+       netware.txt      =>  Contains instructions for downloading a set of
-       vstudio          =>  Contains a Microsoft Visual C++ (MSVC)
+                            project files for building libpng and zlib on
-                            workspace for building libpng and zlib
+                            Netware.
       wince.txt        =>  Contains instructions for downloading a Microsoft
                            Visual C++ (Windows CD Toolkit) workspace for
                            building libpng and zlib on WindowsCE
      scripts       =>  Directory containing scripts for building libpng:
-                            (see scripts/README.txt for the list of scripts)
+       descrip.mms      =>  VMS makefile for MMS or MMK
       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
       makefile.linux   =>  Linux/ELF makefile
                            (gcc, creates libpng10.so.0.1.0.13)
       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
                            libpng10.so.0.1.0.13, uses assembler code
                            tuned for Intel MMX platform)
       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
       makefile.knr     =>  Archaic UNIX Makefile that converts files with
                            ansi2knr (Requires ansi2knr.c from
                            ftp://ftp.cs.wisc.edu/ghost)
       makefile.aix     =>  AIX makefile
       makefile.cygwin  =>  Cygwin/gcc makefile
       makefile.darwin  =>  Darwin makefile
       makefile.dec     =>  DEC Alpha UNIX makefile
       makefile.hpgcc   =>  HPUX makefile using gcc
       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
       makefile.intel   =>  Intel C/C++ version 4.0 and later
       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
       makefile.macosx  =>  MACOS X Makefile
       makefile.netbsd  =>  NetBSD/cc makefile, uses PNGGCCRD
       makefile.openbsd =>  OpenBSD makefile
       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng10.so.0.1.0.13)
       makefile.sunos   =>  Sun makefile
       makefile.solaris =>  Solaris 2.X makefile
                            (gcc, creates libpng10.so.0.1.0.13)
       makefile.so9     =>  Solaris 9 makefile
                            (gcc, creates libpng10.so.0.1.0.13)
       makefile.32sunu  =>  Sun Ultra 32-bit makefile
       makefile.64sunu  =>  Sun Ultra 64-bit makefile
       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
       makefile.mips    =>  MIPS makefile
       makefile.acorn   =>  Acorn makefile
       makefile.amiga   =>  Amiga makefile
       smakefile.ppc    =>  AMIGA smakefile for SAS C V6.58/7.00 PPC
                            compiler (Requires SCOPTIONS, copied from
                            scripts/SCOPTIONS.ppc)
       makefile.atari   =>  Atari makefile
       makefile.beos    =>  BEOS makefile for X86
       makefile.bor     =>  Borland makefile (uses bcc)
       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
       makefile.bd32    =>  To make a png32bd.dll with Borland C++ 4.5
       makefile.tc3     =>  Turbo C 3.0 makefile
       makefile.dj2     =>  DJGPP 2 makefile
       makefile.msc     =>  Microsoft C makefile
       makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
                            later (uses assembler code tuned for Intel MMX
                            platform)
       makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
                            later (does not use assembler code)
       makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
       pngos2.def       =>  OS/2 module definition file used by makefile.os2
       makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
       makevms.com      =>  VMS build script
       pngdef.pas       =>  Defines for a png32bd.dll with Borland C++ 4.5
       SCOPTIONS.ppc    =>  Used with smakefile.ppc
 Good luck, and happy coding.
-Glenn Randers-Pehrson (current maintainer, since 1998)
+-Glenn Randers-Pehrson
- Internet: glennrp at users.sourceforge.net
+ Internet: randeg@alum.rpi.edu
-Andreas Eric Dilger (former maintainer, 1996-1997)
+-Andreas Eric Dilger
- Internet: adilger at enel.ucalgary.ca
+ Internet: adilger@enel.ucalgary.ca
 Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
+-Guy Eric Schalnat
 (formerly of Group 42, Inc)
- Internet: gschal at infinet.com
+ Internet: gschal@infinet.com
--- a/14
+++ b/14
@@ -1,12 +1,12 @@
 /*
 TODO - list of things to do for libpng:
 Final bug fixes.
 Improve API by hiding the png_struct and png_info structs.
 Finish work on the no-floating-point version (including gamma compensation)
 Better C++ wrapper/full C++ implementation?
 Fix problem with C++ and EXTERN "C".
 cHRM transformation.
-Remove setjmp/longjmp usage in favor of returning error codes.
+Improve setjmp/longjmp usage or remove it in favor of returning error codes.
 Palette creation.
 Add "grayscale->palette" transformation and "palette->grayscale" detection.
 Improved dithering.
 Multi-lingual error and warning message support.
@@ -17,12 +17,8 @@ Better filter selection
   (counting huffman bits/precompression?  filter inertia?  filter costs?).
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
-Avoid building gamma tables whenever possible.
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
 Build gamma tables using fixed point (and do away with floating point entirely).
 Use greater precision when changing to linear gamma for compositing against
  background and doing rgb-to-gray transformation.
 Investigate pre-incremented loop counters and other loop constructions.
 Add interpolated method of handling interlacing.
 Switch to the simpler zlib (zlib/libpng) license if legally possible.
 Extend pngvalid.c to validate more of the libpng transformations.
 */
--- a/55
+++ b/55
@@ -0,0 +1,55 @@
   Y2K compliance in libpng:
   =========================
      April 15, 2002
      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 1.0.13 are Y2K compliant.  It is my belief that earlier
      versions were also Y2K compliant.
      Libpng only has three year fields.  One is a 2-byte unsigned integer
      that will hold years up to 65535.  The other two hold the date in text
      format, and will hold years up to 9999.
      The integer is
          "png_uint_16 year" in png_time_struct.
      The strings are
          "png_charp time_buffer" in png_struct and
          "near_time_buffer", which is a local character string in png.c.
      There are seven time-related functions:
          png_convert_to_rfc_1123() in png.c
            (formerly png_convert_to_rfc_1152() in error)
          png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
          png_convert_from_time_t() in pngwrite.c
          png_get_tIME() in pngget.c
          png_handle_tIME() in pngrutil.c, called in pngread.c
          png_set_tIME() in pngset.c
          png_write_tIME() in pngwutil.c, called in pngwrite.c
      All appear to handle dates properly in a Y2K environment.  The
      png_convert_from_time_t() function calls gmtime() to convert from system
      clock time, which returns (year - 1900), which we properly convert to
      the full 4-digit year.  There is a possibility that applications using
      libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
      function, or that they are incorrectly passing only a 2-digit year
      instead of "year - 1900" into the png_convert_from_struct_tm() function,
      but this is not under our control.  The libpng documentation has always
      stated that it works with 4-digit years, and the APIs have been
      documented as such.
      The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
      integer to hold the year, and can hold years as large as 65535.
      zlib, upon which libpng depends, is also Y2K compliant.  It contains
      no date-related code.
         Glenn Randers-Pehrson
         libpng maintainer
         PNG Development Group
--- a/aclocal.m4
+++ b/aclocal.m4
--- a/arm/arm_init.c
+++ b/arm/arm_init.c
@@ -1,232 +0,0 @@
 /* arm_init.c - NEON optimised filter functions
 *
 * Copyright (c) 2013 Glenn Randers-Pehrson
 * Written by Mans Rullgard, 2011.
 * Last changed in libpng 1.6.8 [December 19, 2013]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 */
 /* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
 * called.
 */
 #define _POSIX_SOURCE 1
 #include "../pngpriv.h"
 #ifdef PNG_READ_SUPPORTED
 #if PNG_ARM_NEON_OPT > 0
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
 #include <signal.h> /* for sig_atomic_t */
 #ifdef __ANDROID__
 /* Linux provides access to information about CPU capabilites via
 * /proc/self/auxv, however Android blocks this while still claiming to be
 * Linux.  The Andoid NDK, however, provides appropriate support.
 *
 * Documentation: http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html
 */
 #include <cpu-features.h>
 static int
 png_have_neon(png_structp png_ptr)
 {
   /* This is a whole lot easier than the mess below, however it is probably
    * 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 &&
      (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
 }
 #elif defined(__linux__)
 /* The generic __linux__ implementation requires reading /proc/self/auxv and
 * looking at each element for one that records NEON capabilities.
 */
 #include <unistd.h> /* for POSIX 1003.1 */
 #include <errno.h>  /* for EINTR */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <elf.h>
 #include <asm/hwcap.h>
 /* A read call may be interrupted, in which case it returns -1 and sets errno to
 * EINTR if nothing was done, otherwise (if something was done) a partial read
 * may result.
 */
 static size_t
 safe_read(png_structp png_ptr, int fd, void *buffer_in, size_t nbytes)
 {
   size_t ntotal = 0;
   char *buffer = png_voidcast(char*, buffer_in);
   while (nbytes > 0)
   {
      unsigned int nread;
      int iread;
      /* Passing nread > INT_MAX to read is implementation defined in POSIX
       * 1003.1, therefore despite the unsigned argument portable code must
       * limit the value to INT_MAX!
       */
      if (nbytes > INT_MAX)
         nread = INT_MAX;
      else
         nread = (unsigned int)/*SAFE*/nbytes;
      iread = read(fd, buffer, nread);
      if (iread == -1)
      {
         /* This is the devil in the details, a read can terminate early with 0
          * bytes read because of EINTR, yet it still returns -1 otherwise end
          * of file cannot be distinguished.
          */
         if (errno != EINTR)
         {
            png_warning(png_ptr, "/proc read failed");
            return 0; /* I.e., a permanent failure */
         }
      }
      else if (iread < 0)
      {
         /* Not a valid 'read' result: */
         png_warning(png_ptr, "OS /proc read bug");
         return 0;
      }
      else if (iread > 0)
      {
         /* Continue reading until a permanent failure, or EOF */
         buffer += iread;
         nbytes -= (unsigned int)/*SAFE*/iread;
         ntotal += (unsigned int)/*SAFE*/iread;
      }
      else
         return ntotal;
   }
   return ntotal; /* nbytes == 0 */
 }
 static int
 png_have_neon(png_structp png_ptr)
 {
   int fd = open("/proc/self/auxv", O_RDONLY);
   Elf32_auxv_t aux;
   /* Failsafe: failure to open means no NEON */
   if (fd == -1)
   {
      png_warning(png_ptr, "/proc/self/auxv open failed");
      return 0;
   }
   while (safe_read(png_ptr, fd, &aux, sizeof aux) == sizeof aux)
   {
      if (aux.a_type == AT_HWCAP && (aux.a_un.a_val & HWCAP_NEON) != 0)
      {
         close(fd);
         return 1;
      }
   }
   close(fd);
   return 0;
 }
 #else
   /* We don't know how to do a run-time check on this system */
 #  error "no support for run-time ARM NEON checks"
 #endif /* OS checks */
 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
 #ifndef PNG_ALIGNED_MEMORY_SUPPORTED
 #  error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
 #endif
 void
 png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
 {
   /* The switch statement is compiled in for ARM_NEON_API, the call to
    * png_have_neon is compiled in for ARM_NEON_CHECK.  If both are defined
    * the check is only performed if the API has not set the NEON option on
    * or off explicitly.  In this case the check controls what happens.
    *
    * If the CHECK is not compiled in and the option is UNSET the behavior prior
    * to 1.6.7 was to use the NEON code - this was a bug caused by having the
    * wrong order of the 'ON' and 'default' cases.  UNSET now defaults to OFF,
    * as documented in png.h
    */
 #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 */
            if (no_neon < 0)
               no_neon = !png_have_neon(pp);
            if (no_neon)
               return;
         }
 #ifdef PNG_ARM_NEON_API_SUPPORTED
         break;
 #endif
 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
 #ifdef PNG_ARM_NEON_API_SUPPORTED
      default: /* OFF or INVALID */
         return;
      case PNG_OPTION_ON:
         /* Option turned on */
         break;
   }
 #endif
   /* IMPORTANT: any new external functions used here must be declared using
    * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
    * 'prefix' option to configure works:
    *
    *    ./configure --with-libpng-prefix=foobar_
    *
    * Verify you have got this right by running the above command, doing a build
    * and examining pngprefix.h; it must contain a #define for every external
    * function you add.  (Notice that this happens automatically for the
    * initialization function.)
    */
   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
   if (bpp == 3)
   {
      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
         png_read_filter_row_paeth3_neon;
   }
   else if (bpp == 4)
   {
      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
          png_read_filter_row_paeth4_neon;
   }
 }
 #endif /* PNG_ARM_NEON_OPT > 0 */
 #endif /* PNG_READ_SUPPORTED */
--- a/arm/filter_neon.S
+++ b/arm/filter_neon.S
@@ -1,235 +0,0 @@
 /* filter_neon.S - NEON optimised filter functions
 *
 * Copyright (c) 2013 Glenn Randers-Pehrson
 * Written by Mans Rullgard, 2011.
 * Last changed in libpng 1.5.17 [June 27, 2013]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 */
 /* This is required to get the symbol renames, which are #defines, and also
 * includes the definition (or not) of PNG_ARM_NEON_OPT.
 */
 #define PNG_VERSION_INFO_ONLY
 #include "../pngpriv.h"
 #if defined(__linux__) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
 #endif
 #if PNG_ARM_NEON_OPT > 0
 #ifdef __ELF__
 #   define ELF
 #else
 #   define ELF @
 #endif
        .arch armv7-a
        .fpu  neon
 .macro  func    name, export=0
    .macro endfunc
 ELF     .size   \name, . - \name
        .endfunc
        .purgem endfunc
    .endm
        .text
    .if \export
        .global \name
    .endif
 ELF     .type   \name, STT_FUNC
        .func   \name
 \name:
 .endm
 func    png_read_filter_row_sub4_neon, export=1
        ldr             r3,  [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
 1:
        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
        vadd.u8         d0,  d3,  d4
        vadd.u8         d1,  d0,  d5
        vadd.u8         d2,  d1,  d6
        vadd.u8         d3,  d2,  d7
        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
        subs            r3,  r3,  #16
        bgt             1b
        bx              lr
 endfunc
 func    png_read_filter_row_sub3_neon, export=1
        ldr             r3,  [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
        mov             r0,  r1
        mov             r2,  #3
        mov             r12, #12
        vld1.8          {q11},    [r0], r12
 1:
        vext.8          d5,  d22, d23, #3
        vadd.u8         d0,  d3,  d22
        vext.8          d6,  d22, d23, #6
        vadd.u8         d1,  d0,  d5
        vext.8          d7,  d23, d23, #1
        vld1.8          {q11},    [r0], r12
        vst1.32         {d0[0]},  [r1,:32], r2
        vadd.u8         d2,  d1,  d6
        vst1.32         {d1[0]},  [r1], r2
        vadd.u8         d3,  d2,  d7
        vst1.32         {d2[0]},  [r1], r2
        vst1.32         {d3[0]},  [r1], r2
        subs            r3,  r3,  #12
        bgt             1b
        bx              lr
 endfunc
 func    png_read_filter_row_up_neon, export=1
        ldr             r3,  [r0, #4]           @ rowbytes
 1:
        vld1.8          {q0}, [r1,:128]
        vld1.8          {q1}, [r2,:128]!
        vadd.u8         q0,  q0,  q1
        vst1.8          {q0}, [r1,:128]!
        subs            r3,  r3,  #16
        bgt             1b
        bx              lr
 endfunc
 func    png_read_filter_row_avg4_neon, export=1
        ldr             r12, [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
 1:
        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
        vhadd.u8        d0,  d3,  d16
        vadd.u8         d0,  d0,  d4
        vhadd.u8        d1,  d0,  d17
        vadd.u8         d1,  d1,  d5
        vhadd.u8        d2,  d1,  d18
        vadd.u8         d2,  d2,  d6
        vhadd.u8        d3,  d2,  d19
        vadd.u8         d3,  d3,  d7
        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
        subs            r12, r12, #16
        bgt             1b
        bx              lr
 endfunc
 func    png_read_filter_row_avg3_neon, export=1
        push            {r4,lr}
        ldr             r12, [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
        mov             r0,  r1
        mov             r4,  #3
        mov             lr,  #12
        vld1.8          {q11},    [r0], lr
 1:
        vld1.8          {q10},    [r2], lr
        vext.8          d5,  d22, d23, #3
        vhadd.u8        d0,  d3,  d20
        vext.8          d17, d20, d21, #3
        vadd.u8         d0,  d0,  d22
        vext.8          d6,  d22, d23, #6
        vhadd.u8        d1,  d0,  d17
        vext.8          d18, d20, d21, #6
        vadd.u8         d1,  d1,  d5
        vext.8          d7,  d23, d23, #1
        vld1.8          {q11},    [r0], lr
        vst1.32         {d0[0]},  [r1,:32], r4
        vhadd.u8        d2,  d1,  d18
        vst1.32         {d1[0]},  [r1], r4
        vext.8          d19, d21, d21, #1
        vadd.u8         d2,  d2,  d6
        vhadd.u8        d3,  d2,  d19
        vst1.32         {d2[0]},  [r1], r4
        vadd.u8         d3,  d3,  d7
        vst1.32         {d3[0]},  [r1], r4
        subs            r12, r12, #12
        bgt             1b
        pop             {r4,pc}
 endfunc
 .macro  paeth           rx,  ra,  rb,  rc
        vaddl.u8        q12, \ra, \rb           @ a + b
        vaddl.u8        q15, \rc, \rc           @ 2*c
        vabdl.u8        q13, \rb, \rc           @ pa
        vabdl.u8        q14, \ra, \rc           @ pb
        vabd.u16        q15, q12, q15           @ pc
        vcle.u16        q12, q13, q14           @ pa <= pb
        vcle.u16        q13, q13, q15           @ pa <= pc
        vcle.u16        q14, q14, q15           @ pb <= pc
        vand            q12, q12, q13           @ pa <= pb && pa <= pc
        vmovn.u16       d28, q14
        vmovn.u16       \rx, q12
        vbsl            d28, \rb, \rc
        vbsl            \rx, \ra, d28
 .endm
 func    png_read_filter_row_paeth4_neon, export=1
        ldr             r12, [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
        vmov.i8         d20, #0
 1:
        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
        paeth           d0,  d3,  d16, d20
        vadd.u8         d0,  d0,  d4
        paeth           d1,  d0,  d17, d16
        vadd.u8         d1,  d1,  d5
        paeth           d2,  d1,  d18, d17
        vadd.u8         d2,  d2,  d6
        paeth           d3,  d2,  d19, d18
        vmov            d20, d19
        vadd.u8         d3,  d3,  d7
        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
        subs            r12, r12, #16
        bgt             1b
        bx              lr
 endfunc
 func    png_read_filter_row_paeth3_neon, export=1
        push            {r4,lr}
        ldr             r12, [r0, #4]           @ rowbytes
        vmov.i8         d3,  #0
        vmov.i8         d4,  #0
        mov             r0,  r1
        mov             r4,  #3
        mov             lr,  #12
        vld1.8          {q11},    [r0], lr
 1:
        vld1.8          {q10},    [r2], lr
        paeth           d0,  d3,  d20, d4
        vext.8          d5,  d22, d23, #3
        vadd.u8         d0,  d0,  d22
        vext.8          d17, d20, d21, #3
        paeth           d1,  d0,  d17, d20
        vst1.32         {d0[0]},  [r1,:32], r4
        vext.8          d6,  d22, d23, #6
        vadd.u8         d1,  d1,  d5
        vext.8          d18, d20, d21, #6
        paeth           d2,  d1,  d18, d17
        vext.8          d7,  d23, d23, #1
        vld1.8          {q11},    [r0], lr
        vst1.32         {d1[0]},  [r1], r4
        vadd.u8         d2,  d2,  d6
        vext.8          d19, d21, d21, #1
        paeth           d3,  d2,  d19, d18
        vst1.32         {d2[0]},  [r1], r4
        vmov            d4,  d19
        vadd.u8         d3,  d3,  d7
        vst1.32         {d3[0]},  [r1], r4
        subs            r12, r12, #12
        bgt             1b
        pop             {r4,pc}
 endfunc
 #endif /* PNG_ARM_NEON_OPT > 0 */
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,34 +0,0 @@
 #! /bin/sh
 # a quick hack script to generate necessary files from 
 # auto* tools.
 #
 # WARNING: if you run this you will change the versions
 # of the tools which are used and, maybe, required!
 # You can define your own replacements in your environment.
 # $AUTOCONF,  $AUTOMAKE, $AUTOHEADER, $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
 touch Makefile.am configure.ac
 {
   LT=${LIBTOOLIZE-libtoolize}
   echo "running $LT" >&2
   $LT --force --copy --automake
 } && {
   AL=${ACLOCAL-aclocal}
   echo "running $AL" >&2
   $AL
 } && {
   AH=${AUTOHEADER-autoheader}
   echo "running $AH [ignore the warnings]" >&2
   $AH
 } && {
   AM=${AUTOMAKE-automake}
   echo "running $AM" >&2
   $AM --force-missing --foreign -a -c
 } && {
   AC=${AUTOCONF-autoconf}
   echo "running $AC" >&2
   $AC
 } &&
   echo "autogen complete" >&2 ||
   echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
--- a/347
+++ b/347
@@ -1,347 +0,0 @@
 #! /bin/sh
 # Wrapper for compilers which do not understand '-c -o'.
 scriptversion=2012-10-14.11; # UTC
 # Copyright (C) 1999-2014 Free Software Foundation, Inc.
 # Written by Tom Tromey <tromey@cygnus.com>.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2, or (at your option)
 # any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
 # configuration script generated by Autoconf, you may include it under
 # the same distribution terms that you use for the rest of that program.
 # This file is maintained in Automake, please report
 # bugs to <bug-automake@gnu.org> or send patches to
 # <automake-patches@gnu.org>.
 nl='
 '
 # We need space, tab and new line, in precisely that order.  Quoting is
 # there to prevent tools from complaining about whitespace usage.
 IFS=" ""	$nl"
 file_conv=
 # func_file_conv build_file lazy
 # Convert a $build file to $host form and store it in $file
 # Currently only supports Windows hosts. If the determined conversion
 # type is listed in (the comma separated) LAZY, no conversion will
 # take place.
 func_file_conv ()
 {
  file=$1
  case $file in
    / | /[!/]*) # absolute file, and not a UNC file
      if test -z "$file_conv"; then
 	# lazily determine how to convert abs files
 	case `uname -s` in
 	  MINGW*)
 	    file_conv=mingw
 	    ;;
 	  CYGWIN*)
 	    file_conv=cygwin
 	    ;;
 	  *)
 	    file_conv=wine
 	    ;;
 	esac
      fi
      case $file_conv/,$2, in
 	*,$file_conv,*)
 	  ;;
 	mingw/*)
 	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
 	  ;;
 	cygwin/*)
 	  file=`cygpath -m "$file" || echo "$file"`
 	  ;;
 	wine/*)
 	  file=`winepath -w "$file" || echo "$file"`
 	  ;;
      esac
      ;;
  esac
 }
 # func_cl_dashL linkdir
 # Make cl look for libraries in LINKDIR
 func_cl_dashL ()
 {
  func_file_conv "$1"
  if test -z "$lib_path"; then
    lib_path=$file
  else
    lib_path="$lib_path;$file"
  fi
  linker_opts="$linker_opts -LIBPATH:$file"
 }
 # func_cl_dashl library
 # Do a library search-path lookup for cl
 func_cl_dashl ()
 {
  lib=$1
  found=no
  save_IFS=$IFS
  IFS=';'
  for dir in $lib_path $LIB
  do
    IFS=$save_IFS
    if $shared && test -f "$dir/$lib.dll.lib"; then
      found=yes
      lib=$dir/$lib.dll.lib
      break
    fi
    if test -f "$dir/$lib.lib"; then
      found=yes
      lib=$dir/$lib.lib
      break
    fi
    if test -f "$dir/lib$lib.a"; then
      found=yes
      lib=$dir/lib$lib.a
      break
    fi
  done
  IFS=$save_IFS
  if test "$found" != yes; then
    lib=$lib.lib
  fi
 }
 # func_cl_wrapper cl arg...
 # Adjust compile command to suit cl
 func_cl_wrapper ()
 {
  # Assume a capable shell
  lib_path=
  shared=:
  linker_opts=
  for arg
  do
    if test -n "$eat"; then
      eat=
    else
      case $1 in
 	-o)
 	  # configure might choose to run compile as 'compile cc -o foo foo.c'.
 	  eat=1
 	  case $2 in
 	    *.o | *.[oO][bB][jJ])
 	      func_file_conv "$2"
 	      set x "$@" -Fo"$file"
 	      shift
 	      ;;
 	    *)
 	      func_file_conv "$2"
 	      set x "$@" -Fe"$file"
 	      shift
 	      ;;
 	  esac
 	  ;;
 	-I)
 	  eat=1
 	  func_file_conv "$2" mingw
 	  set x "$@" -I"$file"
 	  shift
 	  ;;
 	-I*)
 	  func_file_conv "${1#-I}" mingw
 	  set x "$@" -I"$file"
 	  shift
 	  ;;
 	-l)
 	  eat=1
 	  func_cl_dashl "$2"
 	  set x "$@" "$lib"
 	  shift
 	  ;;
 	-l*)
 	  func_cl_dashl "${1#-l}"
 	  set x "$@" "$lib"
 	  shift
 	  ;;
 	-L)
 	  eat=1
 	  func_cl_dashL "$2"
 	  ;;
 	-L*)
 	  func_cl_dashL "${1#-L}"
 	  ;;
 	-static)
 	  shared=false
 	  ;;
 	-Wl,*)
 	  arg=${1#-Wl,}
 	  save_ifs="$IFS"; IFS=','
 	  for flag in $arg; do
 	    IFS="$save_ifs"
 	    linker_opts="$linker_opts $flag"
 	  done
 	  IFS="$save_ifs"
 	  ;;
 	-Xlinker)
 	  eat=1
 	  linker_opts="$linker_opts $2"
 	  ;;
 	-*)
 	  set x "$@" "$1"
 	  shift
 	  ;;
 	*.cc | *.CC | *.cxx | *.CXX | *.[cC]++)
 	  func_file_conv "$1"
 	  set x "$@" -Tp"$file"
 	  shift
 	  ;;
 	*.c | *.cpp | *.CPP | *.lib | *.LIB | *.Lib | *.OBJ | *.obj | *.[oO])
 	  func_file_conv "$1" mingw
 	  set x "$@" "$file"
 	  shift
 	  ;;
 	*)
 	  set x "$@" "$1"
 	  shift
 	  ;;
      esac
    fi
    shift
  done
  if test -n "$linker_opts"; then
    linker_opts="-link$linker_opts"
  fi
  exec "$@" $linker_opts
  exit 1
 }
 eat=
 case $1 in
  '')
     echo "$0: No command.  Try '$0 --help' for more information." 1>&2
     exit 1;
     ;;
  -h | --h*)
    cat <<\EOF
 Usage: compile [--help] [--version] PROGRAM [ARGS]
 Wrapper for compilers which do not understand '-c -o'.
 Remove '-o dest.o' from ARGS, run PROGRAM with the remaining
 arguments, and rename the output as expected.
 If you are trying to build a whole package this is not the
 right script to run: please start by reading the file 'INSTALL'.
 Report bugs to <bug-automake@gnu.org>.
 EOF
    exit $?
    ;;
  -v | --v*)
    echo "compile $scriptversion"
    exit $?
    ;;
  cl | *[/\\]cl | cl.exe | *[/\\]cl.exe )
    func_cl_wrapper "$@"      # Doesn't return...
    ;;
 esac
 ofile=
 cfile=
 for arg
 do
  if test -n "$eat"; then
    eat=
  else
    case $1 in
      -o)
 	# configure might choose to run compile as 'compile cc -o foo foo.c'.
 	# So we strip '-o arg' only if arg is an object.
 	eat=1
 	case $2 in
 	  *.o | *.obj)
 	    ofile=$2
 	    ;;
 	  *)
 	    set x "$@" -o "$2"
 	    shift
 	    ;;
 	esac
 	;;
      *.c)
 	cfile=$1
 	set x "$@" "$1"
 	shift
 	;;
      *)
 	set x "$@" "$1"
 	shift
 	;;
    esac
  fi
  shift
 done
 if test -z "$ofile" || test -z "$cfile"; then
  # If no '-o' option was seen then we might have been invoked from a
  # pattern rule where we don't need one.  That is ok -- this is a
  # normal compilation that the losing compiler can handle.  If no
  # '.c' file was seen then we are probably linking.  That is also
  # ok.
  exec "$@"
 fi
 # Name of file we expect compiler to create.
 cofile=`echo "$cfile" | sed 's|^.*[\\/]||; s|^[a-zA-Z]:||; s/\.c$/.o/'`
 # Create the lock directory.
 # Note: use '[/\\:.-]' here to ensure that we don't use the same name
 # that we are using for the .o file.  Also, base the name on the expected
 # object file name, since that is what matters with a parallel build.
 lockdir=`echo "$cofile" | sed -e 's|[/\\:.-]|_|g'`.d
 while true; do
  if mkdir "$lockdir" >/dev/null 2>&1; then
    break
  fi
  sleep 1
 done
 # FIXME: race condition here if user kills between mkdir and trap.
 trap "rmdir '$lockdir'; exit 1" 1 2 15
 # Run the compile.
 "$@"
 ret=$?
 if test -f "$cofile"; then
  test "$cofile" = "$ofile" || mv "$cofile" "$ofile"
 elif test -f "${cofile}bj"; then
  test "${cofile}bj" = "$ofile" || mv "${cofile}bj" "$ofile"
 fi
 rmdir "$lockdir"
 exit $ret
 # Local Variables:
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC"
 # time-stamp-end: "; # UTC"
 # End:
--- a/config.guess
+++ b/config.guess
--- a/config.h.in
+++ b/config.h.in
@@ -1,111 +0,0 @@
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 /* Define to 1 if you have the `feenableexcept' function. */
 #undef HAVE_FEENABLEEXCEPT
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 /* Define to 1 if you have the `z' library (-lz). */
 #undef HAVE_LIBZ
 /* Define to 1 if you have the <malloc.h> header file. */
 #undef HAVE_MALLOC_H
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 /* Define to 1 if you have the `memset' function. */
 #undef HAVE_MEMSET
 /* Define to 1 if you have the `pow' function. */
 #undef HAVE_POW
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H
 /* Define to 1 if you have the <sys/types.h> header file. */
 #undef HAVE_SYS_TYPES_H
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #undef LT_OBJDIR
 /* Name of package */
 #undef PACKAGE
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 /* Define to the full name of this package. */
 #undef PACKAGE_NAME
 /* Define to the full name and version of this package. */
 #undef PACKAGE_STRING
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 /* Define to the home page for this package. */
 #undef PACKAGE_URL
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 /* Turn on ARM Neon optimizations at run-time */
 #undef PNG_ARM_NEON_API_SUPPORTED
 /* Check for ARM Neon support at run-time */
 #undef PNG_ARM_NEON_CHECK_SUPPORTED
 /* Enable ARM Neon optimizations */
 #undef PNG_ARM_NEON_OPT
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 /* Define to 1 if your <sys/time.h> declares `struct tm'. */
 #undef TM_IN_SYS_TIME
 /* Version number of package */
 #undef VERSION
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 /* Define to the equivalent of the C99 'restrict' keyword, or to
   nothing if this is not supported.  Do not define if restrict is
   supported directly.  */
 #undef restrict
 /* Work around a bug in Sun C++: it does not support _Restrict or
   __restrict__, even though the corresponding Sun C compiler ends up with
   "#define restrict _Restrict" or "#define restrict __restrict__" in the
   previous line.  Perhaps some future version of Sun C++ will work with
   restrict; if so, hopefully it defines __RESTRICT like Sun C does.  */
 #if defined __SUNPRO_CC && !defined __RESTRICT
 # define _Restrict
 # define __restrict__
 #endif
 /* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t
--- a/config.sub
+++ b/config.sub
--- a/15887
+++ b/15887
--- a/configure.ac
+++ b/configure.ac
@@ -1,264 +0,0 @@
 # configure.ac
 dnl Process this file with autoconf to produce a configure script.
 dnl
 dnl Minor upgrades (compatible ABI): increment the package version
 dnl (third field in two places below) and set the PNGLIB_RELEASE
 dnl variable.
 dnl
 dnl Major upgrades (incompatible ABI): increment the package major
 dnl version (second field, or first if desired), set the minor
 dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
 dnl Makefile.am to upgrade the package name.
 dnl This is here to prevent earlier autoconf from being used, it
 dnl should not be necessary to regenerate configure if the time
 dnl stamps are correct
 AC_PREREQ(2.59)
 dnl Version number stuff here:
 AC_INIT([libpng], [1.5.26], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE([1.13 serial-tests subdir-objects])
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 PNGLIB_VERSION=1.5.26
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
 PNGLIB_RELEASE=26
 dnl End of version number stuff
 AC_CONFIG_SRCDIR([pngget.c])
 AC_CONFIG_HEADERS([config.h])
 # Checks for programs.
 AC_LANG([C])
 AC_PROG_CC
 AM_PROG_AS
 AC_PROG_LD
 AC_PROG_CPP
 AC_PROG_SED
 AC_PROG_AWK
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 LT_INIT([win32-dll])
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_STRUCT_TM
 AC_C_RESTRICT
 # This is a remnant of the old cc -E validation, where it may have been
 # necessary to use a different preprocessor for .dfn files
 DFNCPP="$CPP"
 AC_SUBST(DFNCPP)
 # Checks for library functions.
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc]))
 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )
 AC_ARG_WITH(zlib-prefix,
   AC_HELP_STRING([--with-zlib-prefix],
                  [prefix that may have been used in installed zlib]),
                  [ZPREFIX=${withval}],
                  [ZPREFIX='z_'])
 AC_CHECK_LIB(z, zlibVersion, ,
    AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, ,
                 AC_ERROR([zlib not installed])))
 # The following is for pngvalid, to ensure it catches FP errors even on
 # platforms that don't enable FP exceptions, the function appears in the math
 # library (typically), it's not an error if it is not found.
 AC_CHECK_LIB([m], [feenableexcept])
 AC_CHECK_FUNCS([feenableexcept])
 LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
 LIBPNG_DEFINES=$LIBPNG_DEFINES
 AC_SUBST(LIBPNG_DEFINES)
 AC_MSG_CHECKING([if using Solaris linker])
 SLD=`$LD --version 2>&1 | grep Solaris`
 if test "$SLD"; then
    have_solaris_ld=yes
    AC_MSG_RESULT(yes)
 else
    have_solaris_ld=no
    AC_MSG_RESULT(no)
 fi
 AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
 AC_MSG_CHECKING([if libraries can be versioned])
 # Special case for PE/COFF platforms: ld reports
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
 *cygwin* | *mingw32* | *interix* )
    have_ld_version_script=no
    AC_MSG_RESULT(no)
 ;;
 * )
 if test "$have_solaris_ld" = "yes"; then
    GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
 else
    GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
 fi
 if test "$GLD"; then
    have_ld_version_script=yes
    AC_MSG_RESULT(yes)
 else
    have_ld_version_script=no
    AC_MSG_RESULT(no)
    AC_MSG_WARN(*** You have not enabled versioned symbols.)
 fi
 ;;
 esac
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
 if test "$have_ld_version_script" = "yes"; then
    AC_MSG_CHECKING([for symbol prefix])
    SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
                  | ${DFNCPP-${CC-gcc} -E} - 2>&1 \
                  | ${EGREP-grep} "^PREFIX=" \
                  | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
    AC_SUBST(SYMBOL_PREFIX)
    AC_MSG_RESULT($SYMBOL_PREFIX)
 fi
 # Substitutions for .in files
 AC_SUBST(PNGLIB_VERSION)
 AC_SUBST(PNGLIB_MAJOR)
 AC_SUBST(PNGLIB_MINOR)
 AC_SUBST(PNGLIB_RELEASE)
 # Additional arguments (and substitutions)
 # Allow the pkg-config directory to be set
 AC_ARG_WITH(pkgconfigdir,
 	AC_HELP_STRING([--with-pkgconfigdir],
 	[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
 	[pkgconfigdir=${withval}],
 	[pkgconfigdir='${libdir}/pkgconfig'])
 AC_SUBST([pkgconfigdir])
 AC_MSG_NOTICE([pkgconfig directory is ${pkgconfigdir}])
 # Make the *-config binary config scripts optional
 AC_ARG_WITH(binconfigs,
 	AC_HELP_STRING([--with-binconfigs],
 		[Generate shell libpng-config scripts as well as pkg-config data]
 		[@<:@default=yes@:>@]),
 	[if test "${withval}" = no; then
 		binconfigs=
 		AC_MSG_NOTICE([libpng-config scripts will not be built])
 	else
 		binconfigs='${binconfigs}'
 	fi],
 	[binconfigs='${binconfigs}'])
 AC_SUBST([binconfigs])
 # Control over what links are made for installed files.  Versioned files are
 # always installed, when the following options are turned on corresponding
 # unversioned links are also created (normally as symbolic links):
 AC_ARG_ENABLE([unversioned-links],
   AS_HELP_STRING([[[--enable-unversioned-links]]],
      [Installed libpng header files are placed in a versioned subdirectory]
      [and installed libpng library (including DLL) files are versioned.]
      [If this option is enabled unversioned links will be created pointing to]
      [the corresponding installed files.  If you use libpng.pc or]
      [libpng-config for all builds you do not need these links, but if you]
      [compile programs directly they will typically #include <png.h> and]
      [link with -lpng; in that case you need the links.]
      [The links can be installed manually using 'make install-header-links']
      [and 'make install-library-links' and can be removed using the]
      [corresponding uninstall- targets.  If you do enable this option every]
      [libpng 'make install' will recreate the links to point to the just]
      [installed version of libpng.  The default is to create the links;]
      [use --disable-unversioned-links to change this]))
 # The AM_CONDITIONAL test is written so that the default is enabled;
 # --disable-unversioned-links must be given to turn the option off.
 AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
 AC_ARG_ENABLE([unversioned-libpng-pc],
   AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]],
      [Install the configuration file 'libpng.pc' as a link to the versioned]
      [version.  This is done by default - use --disable-unversioned-libpng-pc]
      [to change this.]))
 AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
   [test "$enable_unversioned_libpng_pc" != "no"])
 AC_ARG_ENABLE([unversioned-libpng-config],
   AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
      [Install the configuration file 'libpng-config' as a link to the]
      [versioned version.  This is done by default - use]
      [--disable-unversioned-libpng-config to change this.]))
 AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
   [test "$enable_unversioned_libpng_config" != "no"])
 # HOST SPECIFIC OPTIONS
 # =====================
 #
 # ARM
 # ===
 #
 # ARM NEON (SIMD) support.
 AC_ARG_ENABLE([arm-neon],
   AS_HELP_STRING([[[--enable-arm-neon]]],
      [Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
      [no/off: disable the optimizations; check: use internal checking code]
      [(deprecated and poorly supported); api: disable by default, enable by]
      [a call to png_set_option; yes/on: turn on unconditionally.]
      [If not specified: determined by the compiler.]),
   [case "$enableval" in
      no|off)
         # disable the default enabling on __ARM_NEON__ systems:
         AC_DEFINE([PNG_ARM_NEON_OPT], [0],
                   [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_OPT], [2],
                   [Enable ARM Neon optimizations])
         AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if]
            [you want the optimizations unconditionally pass -mfpu=neon]
            [to the compiler.]);;
      *)
         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])
 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
 # Config files, substituting as above
 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
 AC_CONFIG_FILES([libpng-config:libpng-config.in],
 		[chmod +x libpng-config])
 AC_OUTPUT
--- a/contrib/README.txt
+++ b/contrib/README.txt
@@ -1,4 +0,0 @@
 This "contrib" directory contains contributions which are not necessarily under
 the libpng license, although all are open source.  They are not part of
 libpng proper and are not used for building the library.
--- a/contrib/gregbook/COPYING
+++ b/contrib/gregbook/COPYING
@@ -1,340 +0,0 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991
 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
                            Preamble
  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
 License is intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
 the GNU Library General Public License instead.)  You can apply it to
 your programs, too.
  When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 this service if you wish), that you receive source code or can get it
 if you want it, that you can change the software or use pieces of it
 in new free programs; and that you know you can do these things.
  To protect your rights, we need to make restrictions that forbid
 anyone to deny you these rights or to ask you to surrender the rights.
 These restrictions translate to certain responsibilities for you if you
 distribute copies of the software, or if you modify it.
  For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must give the recipients all the rights that
 you have.  You must make sure that they, too, receive or can get the
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  We protect your rights with two steps: (1) copyright the software, and
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 that everyone understands that there is no warranty for this free
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  Finally, any free program is threatened constantly by software
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 patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.
                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  0. This License applies to any program or other work which contains
 a notice placed by the copyright holder saying it may be distributed
 under the terms of this General Public License.  The "Program", below,
 refers to any such program or work, and a "work based on the Program"
 means either the Program or any derivative work under copyright law:
 that is to say, a work containing the Program or a portion of it,
 either verbatim or with modifications and/or translated into another
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 Activities other than copying, distribution and modification are not
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 running the Program is not restricted, and the output from the Program
 is covered only if its contents constitute a work based on the
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 Whether that is true depends on what the Program does.
  1. You may copy and distribute verbatim copies of the Program's
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 You may charge a fee for the physical act of transferring a copy, and
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 These requirements apply to the modified work as a whole.  If
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 make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
                            NO WARRANTY
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 REPAIR OR CORRECTION.
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
                     END OF TERMS AND CONDITIONS
            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Also add information on how to contact you by electronic and paper mail.
 If the program is interactive, make it output a short notice like this
 when it starts in an interactive mode:
    Gnomovision version 69, Copyright (C) year  name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, the commands you use may
 be called something other than `show w' and `show c'; they could even be
 mouse-clicks or menu items--whatever suits your program.
 You should also get your employer (if you work as a programmer) or your
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  Here is a sample; alter the names:
  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.
  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice
 This General Public License does not permit incorporating your program into
 proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
 library.  If this is what you want to do, use the GNU Library General
 Public License instead of this License.
--- a/contrib/gregbook/LICENSE
+++ b/contrib/gregbook/LICENSE
@@ -1,19 +1,12 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -30,21 +23,4 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------
--- a/contrib/gregbook/Makefile.mingw32
+++ b/contrib/gregbook/Makefile.mingw32
@@ -1,131 +0,0 @@
 # Sample makefile for rpng-win / rpng2-win / wpng using mingw32-gcc and make.
 # Greg Roelofs
 # Last modified:  2 June 2007
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
 #	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
 #	generally for sale anymore, but it's the thought that counts,
 #	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
 #
 # Invoke this makefile from a DOS-prompt window via:
 #
 #	make -f Makefile.mingw32
 #
 # This makefile assumes libpng and zlib have already been built or downloaded
 # and are in subdirectories at the same level as the current subdirectory
 # (as indicated by the PNGDIR and ZDIR macros below).  It makes no assumptions
 # at all about the mingw32 installation tree (W32DIR).  Edit as appropriate.
 #
 # Note that the names of the dynamic and static libpng and zlib libraries
 # used below may change in later releases of the libraries.  This makefile
 # builds both statically and dynamically linked executables by default.
 # (You need only one set, but for testing it can be handy to have both.)
 # macros --------------------------------------------------------------------
 #PNGDIR = ../..#		for libpng-x.y.z/contrib/gregbook builds
 PNGDIR = ../libpng-win32
 PNGINC = -I$(PNGDIR)
 PNGLIBd = $(PNGDIR)/libpng.dll.a	# dynamically linked
 PNGLIBs = $(PNGDIR)/libpng.a		# statically linked, local libpng
 #ZDIR = ../../../zlib-win32#	for libpng-x.y.z/contrib/gregbook builds
 ZDIR = ../zlib-win32
 ZINC = -I$(ZDIR)
 ZLIBd = $(ZDIR)/libzdll.a
 ZLIBs = $(ZDIR)/libz.a
 # change this to be the path where mingw32 installs its stuff:
 W32DIR =
 #W32DIR = /usr/local/cross-tools/i386-mingw32msvc
 W32INC = -I$(W32DIR)/include
 W32LIB = $(W32DIR)/lib/libuser32.a $(W32DIR)/lib/libgdi32.a
 CC = gcc
 #CC = i386-mingw32msvc-gcc #	e.g., Linux -> Win32 cross-compilation
 LD = $(CC)
 RM = rm -f
 CPPFLAGS = $(INCS)
 CFLAGS = -O -Wall $(MINGW_CCFLAGS)
 # [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
 # [-ansi, -pedantic and -W can also be used]
 LDFLAGS = $(MINGW_LDFLAGS)
 O = .o
 E = .exe
 INCS = $(PNGINC) $(ZINC) $(W32INC)
 RLIBSd = $(PNGLIBd) $(ZLIBd) $(W32LIB) -lm
 RLIBSs = $(PNGLIBs) $(ZLIBs) $(W32LIB) -lm
 WLIBSd = $(PNGLIBd) $(ZLIBd)
 WLIBSs = $(PNGLIBs) $(ZLIBs)
 RPNG   = rpng-win
 RPNG2  = rpng2-win
 WPNG   = wpng
 ROBJSd  = $(RPNG)$(O) readpng.pic$(O)
 ROBJS2d = $(RPNG2)$(O) readpng2.pic$(O)
 WOBJSd  = $(WPNG)$(O) writepng.pic$(O)
 RPNGs  = $(RPNG)-static
 RPNG2s = $(RPNG2)-static
 WPNGs  = $(WPNG)-static
 ROBJSs  = $(RPNG)$(O) readpng$(O)
 ROBJS2s = $(RPNG2)$(O) readpng2$(O)
 WOBJSs  = $(WPNG)$(O) writepng$(O)
 STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
 DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
 # implicit make rules -------------------------------------------------------
 .c$(O):
 	$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
 %.pic$(O): %.c
 	$(CC) -c $(CPPFLAGS) $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<
 # dependencies --------------------------------------------------------------
 all:  $(EXES)
 $(RPNGs)$(E): $(ROBJSs)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJSs) $(RLIBSs)
 $(RPNG)$(E): $(ROBJSd)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJSd) $(RLIBSd)
 $(RPNG2s)$(E): $(ROBJS2s)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJS2s) $(RLIBSs)
 $(RPNG2)$(E): $(ROBJS2d)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJS2d) $(RLIBSd)
 $(WPNGs)$(E): $(WOBJSs)
 	$(LD) $(LDFLAGS) -o $@ $(WOBJSs) $(WLIBSs)
 $(WPNG)$(E): $(WOBJSd)
 	$(LD) $(LDFLAGS) -o $@ $(WOBJSd) $(WLIBSd)
 $(RPNG)$(O):	$(RPNG).c readpng.h
 $(RPNG2)$(O):	$(RPNG2).c readpng2.h
 $(WPNG)$(O):	$(WPNG).c writepng.h
 readpng$(O) readpng.pic$(O):	readpng.c readpng.h
 readpng2$(O) readpng2.pic$(O):	readpng2.c readpng2.h
 writepng$(O) writepng.pic$(O):	writepng.c writepng.h
 # maintenance ---------------------------------------------------------------
 clean:
 	$(RM) $(EXES)
 	$(RM) $(ROBJSs) $(ROBJS2s) $(WOBJSs)
 	$(RM) $(ROBJSd) $(ROBJS2d) $(WOBJSd)
--- a/contrib/gregbook/Makefile.sgi
+++ b/contrib/gregbook/Makefile.sgi
@@ -23,9 +23,9 @@
 # macros --------------------------------------------------------------------
-PNGINC = -I/usr/local/include/libpng15
+PNGINC = -I/usr/local/include/libpng10
-PNGLIB = -L/usr/local/lib -lpng15	  # dynamically linked against libpng
+PNGLIB = -L/usr/local/lib -lpng10	  # dynamically linked against libpng
-#PNGLIB = /usr/local/lib/libpng15.a # statically linked against libpng
+#PNGLIB = /usr/local/lib/libpng10.a # statically linked against libpng
 # or:
 #PNGINC = -I../..
 #PNGLIB = -L../.. -lpng
@@ -52,11 +52,8 @@ WLIBS = $(PNGLIB) $(ZLIB)
 CC = cc
 LD = cc
 RM = rm -f
-# ABI must be the same as that used to build libpng.
+CFLAGS = -O -fullwarn $(INCS)
-ABI =
+LDFLAGS =
 CPPFLAGS =
 CFLAGS = $(ABI) -O -fullwarn $(INCS)
 LDFLAGS = $(ABI)
 O = .o
 E =
@@ -74,7 +71,7 @@ EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 # implicit make rules -------------------------------------------------------
 .c$(O):
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 # dependencies --------------------------------------------------------------
--- a/contrib/gregbook/Makefile.unx
+++ b/contrib/gregbook/Makefile.unx
@@ -1,122 +1,93 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  2 June 2007
+# Last modified:  7 March 2002
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
-#	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#	Associates, 1999).  Go buy a copy, eh?  Buy some for friends
-#	generally for sale anymore, but it's the thought that counts,
+#	and family, too.  (Not that this is a blatant plug or anything.)
 #	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
 #
 # Invoke this makefile from a shell prompt in the usual way; for example:
 #
 #	make -f Makefile.unx
 #
 # This makefile assumes libpng and zlib have already been built or downloaded
-# and are installed in /usr/local/{include,lib} or as otherwise indicated by
+# and are both installed in /usr/local/{include,lib} (as indicated by the
-# the PNG* and Z* macros below.  Edit as appropriate--choose only ONE each of
+# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
-# the PNGINC, PNGLIBd, PNGLIBs, ZINC, ZLIBd and ZLIBs lines.
+# the PNGINC, PNGLIB, ZINC and ZLIB lines.
 #
-# This makefile builds both dynamically and statically linked executables
+# This makefile builds statically linked executables (against libpng and zlib,
-# (against libpng and zlib, that is), but that can be changed by modifying
+# that is), but that can be changed by uncommenting the appropriate PNGLIB and
-# the "EXES =" line.  (You need only one set, but for testing it can be handy
+# ZLIB lines.
 # to have both.)
 # macros --------------------------------------------------------------------
-#PNGDIR = /usr/local/lib
+PNGINC = -I/usr/local/include/libpng10
-#PNGINC = -I/usr/local/include/libpng15
+#PNGLIB = -L/usr/local/lib -lpng10 # dynamically linked against libpng
-#PNGLIBd = -L$(PNGDIR) -lpng15 # dynamically linked, installed libpng
+PNGLIB = /usr/local/lib/libpng10.a # statically linked against libpng
 #PNGLIBs = $(PNGDIR)/libpng15.a # statically linked, installed libpng
 # or:
-PNGDIR = ../..#	this one is for libpng-x.y.z/contrib/gregbook builds
+#PNGINC = -I../libpng
-#PNGDIR = ../libpng
+#PNGLIB = -L../libpng -lpng
-PNGINC = -I$(PNGDIR)
+#PNGLIB = ../libpng/libpng.a
 PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng15	# dynamically linked
 PNGLIBs = $(PNGDIR)/libpng.a		# statically linked, local libpng
 ZDIR = /usr/local/lib
 #ZDIR = /usr/lib64
 ZINC = -I/usr/local/include
-ZLIBd = -L$(ZDIR) -lz			# dynamically linked against zlib
+#ZLIB = -L/usr/local/lib -lz		# dynamically linked against zlib
-ZLIBs = $(ZDIR)/libz.a			# statically linked against zlib
+ZLIB = /usr/local/lib/libz.a		# statically linked against zlib
-# or:
+#ZINC = -I../zlib
-#ZDIR = ../zlib
+#ZLIB = -L../zlib -lz
-#ZINC = -I$(ZDIR)
+#ZLIB = ../zlib/libz.a
 #ZLIBd = -Wl,-rpath,$(ZDIR) -L$(ZDIR) -lz  # -rpath allows in-place testing
 #ZLIBs = $(ZDIR)/libz.a
 #XINC = -I/usr/include			# old-style, stock X distributions
-#XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
+#XLIB = -L/usr/lib/X11 -lX11
 #XINC = -I/usr/openwin/include		# Sun workstations (OpenWindows)
 #XLIB = -L/usr/openwin/lib -lX11
-XINC = -I/usr/X11R6/include		# new X distributions (X.org, etc.)
+XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
 XLIB = -L/usr/X11R6/lib -lX11
 #XLIB = -L/usr/X11R6/lib64 -lX11	# e.g., Red Hat on AMD64
 INCS = $(PNGINC) $(ZINC) $(XINC)
-RLIBSd = $(PNGLIBd) $(ZLIBd) $(XLIB) -lm
+RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
-RLIBSs = $(PNGLIBs) $(ZLIBs) $(XLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)
 WLIBSd = $(PNGLIBd) $(ZLIBd) -lm
 WLIBSs = $(PNGLIBs) $(ZLIBs)
 CC = gcc
 LD = gcc
 RM = rm -f
-CPPFLAGS = $(INCS) -DFEATURE_LOOP
+CFLAGS = -O -Wall $(INCS)
 CFLAGS = -O -Wall
 # [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
 # [-ansi, -pedantic and -W can also be used]
 LDFLAGS =
 O = .o
 E =
-RPNG   = rpng-x
+RPNG  = rpng-x
-RPNG2  = rpng2-x
+RPNG2 = rpng2-x
-WPNG   = wpng
+WPNG  = wpng
 RPNGs  = $(RPNG)-static
 RPNG2s = $(RPNG2)-static
 WPNGs  = $(WPNG)-static
 ROBJS  = $(RPNG)$(O) readpng$(O)
 ROBJS2 = $(RPNG2)$(O) readpng2$(O)
 WOBJS  = $(WPNG)$(O) writepng$(O)
-STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
+EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
 # implicit make rules -------------------------------------------------------
 .c$(O):
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 # dependencies --------------------------------------------------------------
 all:  $(EXES)
 $(RPNGs)$(E): $(ROBJS)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSs)
 $(RPNG)$(E): $(ROBJS)
-	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSd)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
 $(RPNG2s)$(E): $(ROBJS2)
 	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSs)
 $(RPNG2)$(E): $(ROBJS2)
-	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSd)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
 $(WPNGs)$(E): $(WOBJS)
 	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSs)
 $(WPNG)$(E): $(WOBJS)
-	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSd)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
 $(RPNG)$(O):	$(RPNG).c readpng.h
 $(RPNG2)$(O):	$(RPNG2).c readpng2.h
--- a/contrib/gregbook/Makefile.w32
+++ b/contrib/gregbook/Makefile.w32
@@ -1,12 +1,11 @@
 # Sample makefile for rpng-win / rpng2-win / wpng using MSVC and NMAKE.
 # Greg Roelofs
-# Last modified:  2 June 2007
+# Last modified:  16 February 1999
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
-#	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#	Associates, 1999).  Go buy a copy, eh?  Buy some for friends
-#	generally for sale anymore, but it's the thought that counts,
+#	and family, too.  (Not that this is a blatant plug or anything.)
 #	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
 #
 # Invoke this makefile from a DOS prompt window via:
 #
@@ -53,9 +52,8 @@ WLIBS = $(PNGLIB) $(ZLIB)
 CC = cl
 LD = link
 RM = del
-CPPFLAGS = $(INCS)
+CFLAGS = -nologo -O -W3 $(INCS) $(cvars)
-CFLAGS = -nologo -O -W3 $(cvars)
+# [note that -Wall is an MSVC-specific compilation flag ("all warnings on")]
 # [note that -W3 is an MSVC-specific compilation flag ("all warnings on")]
 # [see %devstudio%\vc\include\win32.mak for cvars macro definition]
 O = .obj
 E = .exe
@@ -77,7 +75,7 @@ EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 # implicit make rules -------------------------------------------------------
 .c$(O):
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $<
 # dependencies --------------------------------------------------------------
--- a/contrib/gregbook/README
+++ b/contrib/gregbook/README
@@ -22,8 +22,7 @@ below.
 Files:
   README             this file
-   LICENSE            terms of distribution and reuse (BSD-like or GNU GPL)
+   LICENSE            terms of distribution and reuse (BSD-like)
   COPYING            GNU General Public License (GPL)
   Makefile.unx       Unix makefile
   Makefile.w32       Windows (MSVC) makefile
@@ -55,17 +54,17 @@ mation and links to the latest version of the source code, and Chapters
 13-15 of the book for detailed discussion of the three programs.
 Greg Roelofs
-http://pobox.com/~newt/greg_contact.html
+newt@pobox.com
-16 March 2008
+30 June 2001
 BUILD INSTRUCTIONS
 - Prerequisites (in order of compilation):
-      - zlib            http://zlib.net/
+      - zlib		http://www.gzip.org/zlib/
-      - libpng          http://www.libpng.org/pub/png/libpng.html
+      - libpng		http://www.libpng.org/pub/png/libpng.html
-      - pngbook         http://www.libpng.org/pub/png/book/sources.html
+      - pngbook		http://www.libpng.org/pub/png/book/sources.html
     The pngbook demo programs are explicitly designed to demonstrate proper
     coding techniques for using the libpng reference library.  As a result,
@@ -151,9 +150,9 @@ BUILD INSTRUCTIONS
     To run the programs, they probably first need to be set up as "foreign
     symbols," with "disk" and "dir" set appropriately:
-     $ rpng  == "$disk:[dir]rpng-x.exe"
+     $ rpng == "$disk:[dir]rpng-x.exe"
     $ rpng2 == "$disk:[dir]rpng2-x.exe"
-     $ wpng  == "$disk:[dir]wpng.exe"
+     $ wpng == "$disk:[dir]wpng.exe"
     All three will print a basic usage screen when run without any command-
     line arguments; see the book for more details.  Note that the options
@@ -165,19 +164,19 @@ RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
     rpng is a simple PNG viewer that can display transparent PNGs with a
     specified background color; for example,
-        rpng -bgcolor \#ff0000 toucan.png
+	rpng -bgcolor #ff0000 toucan.png
     would display the image with a red background.  rpng2 is a progressive
     viewer that simulates a web browser in some respects; it can display
     images against either a background color or a dynamically generated
     background image.  For example:
-        rpng2 -bgpat 16 toucan.png
+	rpng2 -bgpat 16 toucan.png
     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
     format (.pgm or .ppm) to PNG; for example,
-        wpng -time < toucan-notrans.ppm > toucan-notrans.png
+	wpng -time < toucan.ppm > toucan.png
     would convert the specified PPM file (using redirection) to PNG, auto-
     matically setting the PNG modification-time chunk.
--- a/contrib/gregbook/readpng.c
+++ b/contrib/gregbook/readpng.c
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,30 +27,12 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #include <stdio.h>
 #include <stdlib.h>
 #include <zlib.h>
-#include "png.h"        /* libpng header */
+#include "png.h"        /* libpng header; includes zlib.h */
 #include "readpng.h"    /* typedefs, common macros, public prototypes */
 /* future versions of libpng will provide this macro: */
@@ -94,7 +69,7 @@ int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
     * have used slightly more general png_sig_cmp() function instead */
    fread(sig, 1, 8, infile);
-    if (png_sig_cmp(sig, 0, 8))
+    if (!png_check_sig(sig, 8))
        return 1;   /* bad signature */
@@ -215,10 +190,6 @@ 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;
    }
@@ -234,14 +205,8 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
        png_set_expand(png_ptr);
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
        png_set_expand(png_ptr);
 #ifdef PNG_READ_16_TO_8_SUPPORTED
    if (bit_depth == 16)
 #  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
        png_set_scale_16(png_ptr);
 #  else
        png_set_strip_16(png_ptr);
 #  endif
 #endif
    if (color_type == PNG_COLOR_TYPE_GRAY ||
        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
        png_set_gray_to_rgb(png_ptr);
@@ -274,8 +239,7 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
        return NULL;
    }
-    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n",
+    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
        *pChannels, rowbytes, height));
    /* set the individual row_pointers to point at the correct offsets */
--- a/contrib/gregbook/readpng.h
+++ b/contrib/gregbook/readpng.h
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,23 +27,6 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #ifndef TRUE
--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,31 +27,12 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #include <stdlib.h>     /* for exit() prototype */
 #include <setjmp.h>
-#include <zlib.h>
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
 #include "png.h"        /* libpng header from the local directory */
 #include "readpng2.h"   /* typedefs, common macros, public prototypes */
@@ -75,10 +49,79 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
 void readpng2_version_info(void)
 {
-    fprintf(stderr, "   Compiled with libpng %s; using libpng %s\n",
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
-      PNG_LIBPNG_VER_STRING, png_libpng_ver);
+    (defined(__i386__) || defined(_M_IX86)) && \
    defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
    /*
     * WARNING:  This preprocessor approach means that the following code
     *           cannot be used with a libpng DLL older than 1.2.0--the
     *           compiled-in symbols for the new functions will not exist.
     *           (Could use dlopen() and dlsym() on Unix and corresponding
     *           calls for Windows, but not portable...)
     */
    {
        int mmxsupport = png_mmx_support();
        if (mmxsupport < 0)
            fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
              "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
        else {
            int compilerID;
            png_uint_32 mmx_mask = png_get_mmx_flagmask(
              PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
-    fprintf(stderr, "   and with zlib %s; using zlib %s.\n",
+            fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
              "with MMX support\n   (%s version).", PNG_LIBPNG_VER_STRING,
              png_libpng_ver, compilerID == 1? "MSVC++" :
              (compilerID == 2? "GNU C" : "unknown"));
            fprintf(stderr, "  Processor %s MMX instructions.\n",
              mmxsupport? "supports" : "does not support");
            if (mmxsupport > 0) {
                int num_optims = 0;
                fprintf(stderr,
                  "      Potential MMX optimizations supported by libpng:\n");
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)
                    ++num_optims;
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_UP)
                    ++num_optims;
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)
                    ++num_optims;
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)
                    ++num_optims;
                if (num_optims)
                    fprintf(stderr,
                      "         decoding %s row filters (reading)\n",
                      (num_optims == 4)? "all non-trivial" : "some");
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW) {
                    fprintf(stderr, "         combining rows (reading)\n");
                    ++num_optims;
                }
                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_INTERLACE) {
                    fprintf(stderr,
                      "         expanding interlacing (reading)\n");
                    ++num_optims;
                }
                mmx_mask &= ~( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
                             | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
                             | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
                             | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
                             | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
                             | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
                if (mmx_mask) {
                    fprintf(stderr, "         other (unknown)\n");
                    ++num_optims;
                }
                if (num_optims == 0)
                    fprintf(stderr, "         (none)\n");
            }
        }
    }
 #else
    fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
      "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
 #endif
    fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
      ZLIB_VERSION, zlib_version);
 }
@@ -87,7 +130,7 @@ void readpng2_version_info(void)
 int readpng2_check_sig(uch *sig, int num)
 {
-    return !png_sig_cmp(sig, 0, num);
+    return png_check_sig(sig, num);
 }
@@ -131,38 +174,6 @@ int readpng2_init(mainprog_info *mainprog_ptr)
    }
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    /* prepare the reader to ignore all recognized chunks whose data won't be
     * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
     * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
    {
        /* These byte strings were copied from png.h.  If a future libpng
         * version recognizes more chunks, add them to this list.  If a
         * future version of readpng2.c recognizes more chunks, delete them
         * from this list. */
        static /* const */ png_byte chunks_to_ignore[] = {
             99,  72,  82,  77, '\0',  /* cHRM */
            104,  73,  83,  84, '\0',  /* hIST */
            105,  67,  67,  80, '\0',  /* iCCP */
            105,  84,  88, 116, '\0',  /* iTXt */
            111,  70,  70, 115, '\0',  /* oFFs */
            112,  67,  65,  76, '\0',  /* pCAL */
            112,  72,  89, 115, '\0',  /* pHYs */
            115,  66,  73,  84, '\0',  /* sBIT */
            115,  67,  65,  76, '\0',  /* sCAL */
            115,  80,  76,  84, '\0',  /* sPLT */
            115,  84,  69,  82, '\0',  /* sTER */
            116,  69,  88, 116, '\0',  /* tEXt */
            116,  73,  77,  69, '\0',  /* tIME */
            122,  84,  88, 116, '\0'   /* zTXt */
        };
        png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,
          chunks_to_ignore, sizeof(chunks_to_ignore)/5);
    }
 #endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */
    /* instead of doing png_init_io() here, now we set up our callback
     * functions for progressive decoding */
@@ -170,6 +181,96 @@ int readpng2_init(mainprog_info *mainprog_ptr)
      readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
    /*
     * may as well enable or disable MMX routines here, if supported;
     *
     * to enable all:  mask = png_get_mmx_flagmask (
     *                   PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
     *                 flags = png_get_asm_flags (png_ptr);
     *                 flags |= mask;
     *                 png_set_asm_flags (png_ptr, flags);
     *
     * to disable all:  mask = png_get_mmx_flagmask (
     *                   PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
     *                  flags = png_get_asm_flags (png_ptr);
     *                  flags &= ~mask;
     *                  png_set_asm_flags (png_ptr, flags);
     */
 #if (defined(__i386__) || defined(_M_IX86)) && \
    defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
    /*
     * WARNING:  This preprocessor approach means that the following code
     *           cannot be used with a libpng DLL older than 1.2.0--the
     *           compiled-in symbols for the new functions will not exist.
     *           (Could use dlopen() and dlsym() on Unix and corresponding
     *           calls for Windows, but not portable...)
     */
    {
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
        png_uint_32 mmx_disable_mask = 0;
        png_uint_32 asm_flags, mmx_mask;
        int compilerID;
        if (mainprog_ptr->nommxfilters)
            mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
                                | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
                                | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
                                | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
        if (mainprog_ptr->nommxcombine)
            mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_COMBINE_ROW;
        if (mainprog_ptr->nommxinterlace)
            mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_INTERLACE;
        asm_flags = png_get_asm_flags(png_ptr);
        png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
        /* Now query libpng's asm settings, just for yuks.  Note that this
         * differs from the querying of its *potential* MMX capabilities
         * in readpng2_version_info(); this is true runtime verification. */
        asm_flags = png_get_asm_flags(png_ptr);
        mmx_mask = png_get_mmx_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE,
          &compilerID);
        if (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED)
            fprintf(stderr,
              "  MMX support (%s version) is compiled into libpng\n",
              compilerID == 1? "MSVC++" :
              (compilerID == 2? "GNU C" : "unknown"));
        else
            fprintf(stderr, "  MMX support is not compiled into libpng\n");
        fprintf(stderr, "  MMX instructions are %ssupported by CPU\n",
          (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU)? "" : "not ");
        fprintf(stderr, "  MMX read support for combining rows is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)? "en" : "dis");
        fprintf(stderr,
          "  MMX read support for expanding interlacing is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)? "en" : "dis");
        fprintf(stderr, "  MMX read support for \"sub\" filter is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "en" : "dis");
        fprintf(stderr, "  MMX read support for \"up\" filter is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP)? "en" : "dis");
        fprintf(stderr, "  MMX read support for \"avg\" filter is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)? "en" : "dis");
        fprintf(stderr, "  MMX read support for \"Paeth\" filter is %sabled\n",
          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "en" : "dis");
        asm_flags &= (mmx_mask & ~( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
                                  | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
                                  | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
                                  | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
                                  | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
                                  | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ));
        if (asm_flags)
            fprintf(stderr,
              "  additional MMX support is also enabled (0x%02lx)\n",
              asm_flags);
 #else  /* !PNG_ASSEMBLER_CODE_SUPPORTED */
        fprintf(stderr, "  MMX querying is disabled in libpng.\n");
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
    }
 #endif
    /* make sure we save our pointers for use in readpng2_decode_data() */
    mainprog_ptr->png_ptr = png_ptr;
@@ -217,12 +318,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
 {
    mainprog_info  *mainprog_ptr;
    int  color_type, bit_depth;
    png_uint_32 width, height;
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    double  gamma;
 #else
    png_fixed_point gamma;
 #endif
    /* setjmp() doesn't make sense here, because we'd either have to exit(),
@@ -257,10 +353,8 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
    /* this is just like in the non-progressive case */
-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
+    png_get_IHDR(png_ptr, info_ptr, &mainprog_ptr->width,
-       NULL, NULL, NULL);
+      &mainprog_ptr->height, &bit_depth, &color_type, NULL, NULL, NULL);
    mainprog_ptr->width = (ulg)width;
    mainprog_ptr->height = (ulg)height;
    /* since we know we've read all of the PNG file's "header" (i.e., up
@@ -311,14 +405,8 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
        png_set_expand(png_ptr);
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
        png_set_expand(png_ptr);
 #ifdef PNG_READ_16_TO_8_SUPPORTED
    if (bit_depth == 16)
 #  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
        png_set_scale_16(png_ptr);
 #  else
        png_set_strip_16(png_ptr);
 #  endif
 #endif
    if (color_type == PNG_COLOR_TYPE_GRAY ||
        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
        png_set_gray_to_rgb(png_ptr);
@@ -339,19 +427,11 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
     * "gamma" value for the entire display system, i.e., the product of
     * LUT_exponent and CRT_exponent. */
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
    else
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
-#else
+
    if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
        png_set_gamma_fixed(png_ptr,
            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
    else
        png_set_gamma_fixed(png_ptr,
            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
 #endif
    /* we'll let libpng expand interlaced images, too */
@@ -500,12 +580,5 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
        exit(99);
    }
    /* Now we have our data structure we can use the information in it
     * to return control to our own higher level code (all the points
     * where 'setjmp' is called in this file.)  This will work with other
     * error handling mechanisms as well - libpng always calls png_error
     * when it can proceed no further, thus, so long as the error handler
     * is intercepted, application code can do its own error recovery.
     */
    longjmp(mainprog_ptr->jmpbuf, 1);
 }
--- a/contrib/gregbook/readpng2.h
+++ b/contrib/gregbook/readpng2.h
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,23 +27,6 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #ifndef TRUE
@@ -69,12 +45,6 @@
 #  define Trace(x)  ;
 #endif
 enum rpng2_states {
    kPreInit = 0,
    kWindowInit,
    kDone
 };
 typedef unsigned char   uch;
 typedef unsigned short  ush;
 typedef unsigned long   ulg;
@@ -96,7 +66,12 @@ typedef struct _mainprog_info {
    int rowbytes;
    int channels;
    int need_bgcolor;
-    int state;
+#if (defined(__i386__) || defined(_M_IX86))
    int nommxfilters;
    int nommxcombine;
    int nommxinterlace;
 #endif
    int done;
    uch bg_red;
    uch bg_green;
    uch bg_blue;
--- a/contrib/gregbook/readppm.c
+++ b/contrib/gregbook/readppm.c
@@ -1,179 +0,0 @@
 /*---------------------------------------------------------------------------
   rpng - simple PNG display program                              readppm.c
  ---------------------------------------------------------------------------
   This is a special-purpose replacement for readpng.c that allows binary
   PPM files to be used in place of PNG images.
  ---------------------------------------------------------------------------
      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
      1. Redistributions of source code must retain the above copyright
         notice, disclaimer, and this list of conditions.
      2. Redistributions in binary form must reproduce the above copyright
         notice, disclaimer, and this list of conditions in the documenta-
         tion and/or other materials provided with the distribution.
      3. All advertising materials mentioning features or use of this
         software must display the following acknowledgment:
            This product includes software developed by Greg Roelofs
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #include <stdio.h>
 #include <stdlib.h>
 #include "readpng.h"    /* typedefs, common macros, public prototypes */
 ulg  width, height;
 int  bit_depth, color_type, channels;
 uch  *image_data = NULL;
 FILE *saved_infile;
 void readpng_version_info()
 {
    fprintf(stderr, "   Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");
 }
 /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
 int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 {
    static uch ppmline[256];
    int maxval;
    saved_infile = infile;
    fgets(ppmline, 256, infile);
    if (ppmline[0] != 'P' || ppmline[1] != '6') {
        fprintf(stderr, "ERROR:  not a PPM file\n");
        return 1;
    }
    /* possible color types:  P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */
    if (ppmline[1] == '6') {
        color_type = 2;
        channels = 3;
    } else if (ppmline[1] == '8') {
        color_type = 6;
        channels = 4;
    } else /* if (ppmline[1] == '5') */ {
        color_type = 0;
        channels = 1;
    }
    do {
        fgets(ppmline, 256, infile);
    } while (ppmline[0] == '#');
    sscanf(ppmline, "%lu %lu", &width, &height);
    do {
        fgets(ppmline, 256, infile);
    } while (ppmline[0] == '#');
    sscanf(ppmline, "%d", &maxval);
    if (maxval != 255) {
        fprintf(stderr, "ERROR:  maxval = %d\n", maxval);
        return 2;
    }
    bit_depth = 8;
    *pWidth = width;
    *pHeight = height;
    return 0;
 }
 /* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
 * scales values to 8-bit if necessary */
 int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
 {
    return 1;
 }
 /* display_exponent == LUT_exponent * CRT_exponent */
 uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
 {
    ulg  rowbytes;
    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
     * transparency chunks to full alpha channel; strip 16-bit-per-sample
     * images to 8 bits per sample; and convert grayscale to RGB[A] */
    /* GRR WARNING:  grayscale needs to be expanded and channels reset! */
    *pRowbytes = rowbytes = channels*width;
    *pChannels = channels;
    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
        return NULL;
    }
    Trace((stderr, "readpng_get_image:  rowbytes = %ld, height = %ld\n", rowbytes, height));
    /* now we can go ahead and just read the whole image */
    fread(image_data, 1L, rowbytes*height, saved_infile);
    return image_data;
 }
 void readpng_cleanup(int free_image_data)
 {
    if (free_image_data && image_data) {
        free(image_data);
        image_data = NULL;
    }
 }
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -22,25 +22,16 @@
    - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed
              command-line parsing bug
    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -57,61 +48,18 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "2.01 of 16 March 2008"
+#define VERSION   "1.20 of 28 May 2001"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <windows.h>
 #ifdef __CYGWIN__
 /* getch replacement. Turns out, we don't really need this,
 * but leave it here if we ever enable any of the uses of
 * _getch in the main code
 */
 #include <unistd.h>
 #include <termio.h>
 #include <sys/ioctl.h>
 int repl_getch( void )
 {
  char ch;
  int fd = fileno(stdin);
  struct termio old_tty, new_tty;
  ioctl(fd, TCGETA, &old_tty);
  new_tty = old_tty;
  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
  ioctl(fd, TCSETA, &new_tty);
  fread(&ch, 1, sizeof(ch), stdin);
  ioctl(fd, TCSETA, &old_tty);
  return ch;
 }
 #define _getch repl_getch
 #else
 #include <conio.h>      /* only for _getch() */
 #endif
 /* #define DEBUG  :  this enables the Trace() macros */
@@ -137,9 +85,10 @@ static void       rpng_win_cleanup(void);
 LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
-static char titlebar[1024];
+static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
 static char *icon_name = PROGNAME;     /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
@@ -179,7 +128,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    filename = (char *)NULL;
-#ifndef __CYGWIN__
+
    /* First reenable console output, which normally goes to the bit bucket
     * for windowed apps.  Closing the console window will terminate the
     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
@@ -188,7 +137,6 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
 #endif
    /* Next set the default value for our display-system exponent, i.e.,
@@ -299,43 +247,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        }
    }
-    if (!filename)
+    if (!filename) {
        ++error;
-
+    } else if (!(infile = fopen(filename, "rb"))) {
    /* print usage screen if any errors up to this point */
    if (error) {
 #ifndef __CYGWIN__
        int ch;
 #endif
        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
 #ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen.\n"
 #endif
          "\n", PROGNAME, default_display_exponent);
 #ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
 #endif
        exit(1);
    }
    if (!(infile = fopen(filename, "rb"))) {
        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
        ++error;
    } else {
@@ -348,7 +262,8 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
                    break;
                case 2:
                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n",
                      filename);
                    break;
                case 4:
                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -365,25 +280,34 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    }
-    if (error) {
+    /* usage screen */
 #ifndef __CYGWIN__
        int ch;
 #endif
-        fprintf(stderr, PROGNAME ":  aborting.\n");
+    if (error) {
-#ifndef __CYGWIN__
+        int ch;
        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
          "Press Q or Esc to quit this usage screen.\n"
          "\n", PROGNAME, default_display_exponent);
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
-#endif
+        exit(1);
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
 #ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
 #endif
    }
@@ -401,14 +325,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     * check for one in the PNG file--if not, the initialized values of 0
     * (black) will be used */
-    if (have_bg) {
+    if (have_bg)
-        unsigned r, g, b;   /* this approach quiets compiler warnings */
+        sscanf(bgstr+1, "%2x%2x%2x", &bg_red, &bg_green, &bg_blue);
-
+    else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
        bg_red   = (uch)r;
        bg_green = (uch)g;
        bg_blue  = (uch)b;
    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
        readpng_cleanup(TRUE);
        fprintf(stderr, PROGNAME
          ":  libpng error while checking for background color\n");
@@ -456,12 +375,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* wait for the user to tell us when to quit */
    printf(
-#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
 #else
      "Done.  Press mouse button 1 (within image window) to quit.\n"
 #endif
    );
    fflush(stdout);
    while (GetMessage(&msg, NULL, 0, 0)) {
--- a/contrib/gregbook/rpng-x.c
+++ b/contrib/gregbook/rpng-x.c
@@ -9,7 +9,7 @@
   by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).
   to do:
-    - 8-bit (colormapped) X support
+    - 8-bit support
    - use %.1023s to simplify truncation of title-bar string?
  ---------------------------------------------------------------------------
@@ -21,28 +21,18 @@
    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
    - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed
              command-line parsing bug
-    - 1.12:  fixed some small X memory leaks (thanks to Fran<EFBFBD>ois Petitjean)
+    - 1.12:  fixed small X memory leak (thanks to Francois Petitjean)
-    - 1.13:  fixed XFreeGC() crash bug (thanks to Patrick Welche)
+    - 1.13:  fixed XFreeGC() crash bug
    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -59,30 +49,11 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "2.01 of 16 March 2008"
+#define VERSION   "1.13 of 16 August 2001"
 #define RESNAME   "rpng"        /* our X resource application name */
 #define RESCLASS  "Rpng"        /* our X resource class name */
 #include <stdio.h>
 #include <stdlib.h>
@@ -120,8 +91,6 @@ static int  rpng_x_msb(ulg u32val);
 static char titlebar[1024], *window_name = titlebar;
 static char *appname = LONGNAME;
 static char *icon_name = PROGNAME;
 static char *res_name = RESNAME;
 static char *res_class = RESCLASS;
 static char *filename;
 static FILE *infile;
@@ -266,33 +235,9 @@ int main(int argc, char **argv)
        }
    }
-    if (!filename)
+    if (!filename) {
        ++error;
-
+    } else if (!(infile = fopen(filename, "rb"))) {
    /* print usage screen if any errors up to this point */
    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        readpng_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
          "is displayed) to quit.\n"
          "\n", PROGNAME, default_display_exponent);
        exit(1);
    }
    if (!(infile = fopen(filename, "rb"))) {
        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
        ++error;
    } else {
@@ -305,7 +250,8 @@ int main(int argc, char **argv)
                    break;
                case 2:
                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n",
                      filename);
                    break;
                case 4:
                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -330,9 +276,25 @@ int main(int argc, char **argv)
    }
    /* usage screen */
    if (error) {
-        fprintf(stderr, PROGNAME ":  aborting.\n");
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
-        exit(2);
+        readpng_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
          "is displayed) to quit.\n"
          "\n", PROGNAME, default_display_exponent);
        exit(1);
    }
@@ -437,12 +399,11 @@ static int rpng_x_create_window(void)
    XEvent e;
    XGCValues gcvalues;
    XSetWindowAttributes attr;
    XSizeHints *size_hints;
    XTextProperty windowName, *pWindowName = &windowName;
    XTextProperty iconName, *pIconName = &iconName;
    XVisualInfo visual_info;
    XSizeHints *size_hints;
    XWMHints *wm_hints;
    XClassHint *class_hints;
    screen = DefaultScreen(display);
@@ -565,7 +526,7 @@ static int rpng_x_create_window(void)
    if (!XStringListToTextProperty(&icon_name, 1, pIconName))
        pIconName = NULL;
-    /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */
+    /* OK if either hints allocation fails; XSetWMProperties() allows NULLs */
    if ((size_hints = XAllocSizeHints()) != NULL) {
        /* window will not be resizable */
@@ -581,13 +542,8 @@ static int rpng_x_create_window(void)
        wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;
    }
    if ((class_hints = XAllocClassHint()) != NULL) {
        class_hints->res_name = res_name;
        class_hints->res_class = res_class;
    }
    XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
-      size_hints, wm_hints, class_hints);
+      size_hints, wm_hints, NULL);
    /* various properties and hints no longer needed; free memory */
    if (pWindowName)
@@ -598,8 +554,6 @@ static int rpng_x_create_window(void)
        XFree(size_hints);
    if (wm_hints)
       XFree(wm_hints);
    if (class_hints)
       XFree(class_hints);
    XMapWindow(display, window);
--- a/contrib/gregbook/rpng2-win.c
+++ b/contrib/gregbook/rpng2-win.c
@@ -10,7 +10,7 @@
   tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der
   Meulen for the "diamond" and "radial waves" patterns, respectively.
-   to do (someday, maybe):
+   to do:
    - handle quoted command-line args (especially filenames with spaces)
    - finish resizable checkerboard-gradient (sizes 4-128?)
    - use %.1023s to simplify truncation of title-bar string?
@@ -27,29 +27,16 @@
    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
    - 1.21:  made minor tweak to usage screen to fit within 25-line console
    - 1.22:  added AMD64/EM64T support (__x86_64__)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed 64-bit typo in readpng2.c
    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
              unexpected-EOF and file-read-error cases
    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -66,28 +53,11 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "2.02 of 16 March 2008"
+#define VERSION   "1.21 of 29 June 2001"
 #include <stdio.h>
 #include <stdlib.h>
@@ -96,33 +66,7 @@
 #include <time.h>
 #include <math.h>      /* only for PvdM background code */
 #include <windows.h>
 #ifdef __CYGWIN__
 /* getch replacement. Turns out, we don't really need this,
 * but leave it here if we ever enable any of the uses of
 * _getch in the main code
 */
 #include <unistd.h>
 #include <termio.h>
 #include <sys/ioctl.h>
 int repl_getch( void )
 {
  char ch;
  int fd = fileno(stdin);
  struct termio old_tty, new_tty;
  ioctl(fd, TCGETA, &old_tty);
  new_tty = old_tty;
  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
  ioctl(fd, TCSETA, &new_tty);
  fread(&ch, 1, sizeof(ch), stdin);
  ioctl(fd, TCSETA, &old_tty);
  return ch;
 }
 #define _getch repl_getch
 #else
 #include <conio.h>     /* only for _getch() */
 #endif
 /* all for PvdM background code: */
 #ifndef PI
@@ -175,9 +119,10 @@ static void       rpng2_win_cleanup(void);
 LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
-static char titlebar[1024];
+static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
 static char *icon_name = PROGNAME;    /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
@@ -296,7 +241,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    filename = (char *)NULL;
    memset(&rpng2_info, 0, sizeof(mainprog_info));
-#ifndef __CYGWIN__
+
    /* Next reenable console output, which normally goes to the bit bucket
     * for windowed apps.  Closing the console window will terminate the
     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
@@ -305,7 +250,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
-#endif
+
    /* Set the default value for our display-system exponent, i.e., the
     * product of the CRT exponent and the exponent corresponding to
@@ -422,6 +367,18 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            }
        } else if (!strncmp(*argv, "-timing", 2)) {
            timing = TRUE;
 #if (defined(__i386__) || defined(_M_IX86))
        } else if (!strncmp(*argv, "-nommxfilters", 7)) {
            rpng2_info.nommxfilters = TRUE;
        } else if (!strncmp(*argv, "-nommxcombine", 7)) {
            rpng2_info.nommxcombine = TRUE;
        } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
            rpng2_info.nommxinterlace = TRUE;
        } else if (!strcmp(*argv, "-nommx")) {
            rpng2_info.nommxfilters = TRUE;
            rpng2_info.nommxcombine = TRUE;
            rpng2_info.nommxinterlace = TRUE;
 #endif
        } else {
            if (**argv != '-') {
                filename = *argv;
@@ -432,56 +389,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        }
    }
-    if (!filename)
+    if (!filename) {
        ++error;
-
+    } else if (!(infile = fopen(filename, "rb"))) {
    /* print usage screen if any errors up to this point */
    if (error) {
 #ifndef __CYGWIN__
        int ch;
 #endif
        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
          "        %*s file.png\n\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images; overrides -bgpat option\n"
          "    pat \tdesired background pattern number (1-%d); used with\n"
          "\t\t  transparent images; overrides -bgcolor option\n"
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
 #ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen. ",
 #else
          ,
 #endif
          PROGNAME,
 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
    !(defined(__CYGWIN__) || defined(__MINGW32__))
          (int)strlen(PROGNAME), " ",
 #endif
          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
        fflush(stderr);
 #ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
 #endif
        exit(1);
    }
    if (!(infile = fopen(filename, "rb"))) {
        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
        ++error;
    } else {
@@ -495,7 +405,8 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            switch (rc) {
                case 2:
                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n",
                      filename);
                    break;
                case 4:
                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -512,25 +423,51 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    }
-    if (error) {
+    /* usage screen */
 #ifndef __CYGWIN__
        int ch;
 #endif
-        fprintf(stderr, PROGNAME ":  aborting.\n");
+    if (error) {
-#ifndef __CYGWIN__
+        int ch;
        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
 #if (defined(__i386__) || defined(_M_IX86))
          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
 #endif
          "        %*s file.png\n\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images; overrides -bgpat option\n"
          "    pat \tdesired background pattern number (1-%d); used with\n"
          "\t\t  transparent images; overrides -bgcolor option\n"
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
 #if (defined(__i386__) || defined(_M_IX86))
          "    -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
          "\t\t  combining rows, and expanding interlacing, respectively\n"
 #endif
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
          "Press Q or Esc to quit this usage screen. ",
          PROGNAME,
 #if (defined(__i386__) || defined(_M_IX86))
          strlen(PROGNAME), " ",
 #endif
          strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
        fflush(stderr);
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
-#endif
+        exit(1);
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
 #ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
 #endif
        fflush(stderr);
    }
@@ -557,7 +494,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    } else
        rpng2_info.need_bgcolor = TRUE;
-    rpng2_info.state = kPreInit;
+    rpng2_info.done = FALSE;
    rpng2_info.mainprog_init = rpng2_win_init;
    rpng2_info.mainprog_display_row = rpng2_win_display_row;
    rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
@@ -577,27 +514,10 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
            ++error;
        Trace((stderr, "done with readpng2_decode_data()\n"))
-
+        if (error || feof(infile) || rpng2_info.done)
        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
            if (rpng2_info.state == kDone) {
                Trace((stderr, "done decoding PNG image\n"))
            } else if (ferror(infile)) {
                fprintf(stderr, PROGNAME
                  ":  error while reading PNG image file\n");
                exit(3);
            } else if (feof(infile)) {
                fprintf(stderr, PROGNAME ":  end of file reached "
                  "(unexpectedly) while reading PNG image file\n");
                exit(3);
            } else /* if (error) */ {
                /* will print error message below */
            }
            break;
        }
        if (timing)
            Sleep(1000L);
        incount = fread(inbuf, 1, INBUFSIZE, infile);
    }
@@ -644,7 +564,7 @@ static void rpng2_win_init()
    ulg rowbytes = rpng2_info.rowbytes;
    Trace((stderr, "beginning rpng2_win_init()\n"))
-    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
+    Trace((stderr, "  rowbytes = %ld\n", rpng2_info.rowbytes))
    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
    Trace((stderr, "  height = %ld\n", rpng2_info.height))
@@ -674,8 +594,6 @@ static void rpng2_win_init()
        readpng2_cleanup(&rpng2_info);
        return;
    }
    rpng2_info.state = kWindowInit;
 }
@@ -1171,14 +1089,9 @@ static void rpng2_win_finish_display()
     * we have nothing to do here except set a flag and let the user know
     * that the image is done */
-    rpng2_info.state = kDone;
+    rpng2_info.done = TRUE;
    printf(
-#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
 #else
      "Done.  Press mouse button 1 (within image window) to quit.\n"
 #endif
    );
    fflush(stdout);
 }
--- a/contrib/gregbook/rpng2-x.c
+++ b/contrib/gregbook/rpng2-x.c
--- a/contrib/gregbook/toucan.png
+++ b/contrib/gregbook/toucan.png
--- a/contrib/gregbook/wpng.c
+++ b/contrib/gregbook/wpng.c
@@ -5,10 +5,8 @@
   This program converts certain NetPBM binary files (grayscale and RGB,
   maxval = 255) to PNG.  Non-interlaced PNGs are written progressively;
   interlaced PNGs are read and written in one memory-intensive blast.
   Thanks to Jean-loup Gailly for providing the necessary trick to read
-   interactive text from the keyboard while stdin is redirected.  Thanks
+   interactive text from the keyboard while stdin is redirected.
   to Cosmin Truta for Cygwin fixes.
   NOTE:  includes provisional support for PNM type "8" (portable alphamap)
          images, presumed to be a 32-bit interleaved RGBA format; no pro-
@@ -26,32 +24,16 @@
    - 1.02:  modified to allow abbreviated options
    - 1.03:  removed extraneous character from usage screen; fixed bug in
              command-line parsing
    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix
              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
    - 2.00:  dual-licensed (added GNU GPL)
        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line
         dose not work!  In order to do something useful I needed to redirect
         both input and output, with cygwin and with bcc32 as well.  Under
         Linux, the same wpng appears to work fine.  I don't know what is
         the problem."]
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -68,35 +50,16 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #define PROGNAME  "wpng"
-#define VERSION   "2.00 of 2 June 2007"
+#define VERSION   "1.03 of 19 March 2000"
 #define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"
 #if defined(__MSDOS__) || defined(__OS2__)
 #  define DOS_OS2_W32
-#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#elif defined(_WIN32) || defined(__WIN32__)
-#  ifndef __GNUC__   /* treat Win32 native ports of gcc as Unix environments */
+#  define DOS_OS2_W32
 #    define DOS_OS2_W32
 #  endif
 #endif
 #include <stdio.h>
--- a/contrib/gregbook/writepng.c
+++ b/contrib/gregbook/writepng.c
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,30 +27,12 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #include <stdlib.h>     /* for exit() prototype */
 #include <zlib.h>
-#include "png.h"        /* libpng header, includes setjmp.h */
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
 #include "writepng.h"   /* typedefs, common macros, public prototypes */
@@ -105,8 +80,7 @@ int writepng_init(mainprog_info *mainprog_ptr)
    /* setjmp() must be called in every function that calls a PNG-writing
     * libpng function, unless an alternate error handler was installed--
     * but compatible error handlers must either use longjmp() themselves
-     * (as in this program) or some other method to return control to
+     * (as in this program) or exit immediately, so here we go: */
     * application code, so here we go: */
    if (setjmp(mainprog_ptr->jmpbuf)) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
@@ -390,12 +364,5 @@ static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
        exit(99);
    }
    /* Now we have our data structure we can use the information in it
     * to return control to our own higher level code (all the points
     * where 'setjmp' is called in this file.)  This will work with other
     * error handling mechanisms as well - libpng always calls png_error
     * when it can proceed no further, thus, so long as the error handler
     * is intercepted, application code can do its own error recovery.
     */
    longjmp(mainprog_ptr->jmpbuf, 1);
 }
--- a/contrib/gregbook/writepng.h
+++ b/contrib/gregbook/writepng.h
@@ -4,20 +4,13 @@
  ---------------------------------------------------------------------------
-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.
      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):
      LICENSE 1 ("BSD-like with advertising clause"):
      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:
@@ -34,23 +27,6 @@
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.
      LICENSE 2 (GNU GPL v2 or later):
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ---------------------------------------------------------------------------*/
 #ifndef TRUE
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
--- a/contrib/msvctest/README.txt
+++ b/contrib/msvctest/README.txt
@@ -0,0 +1,22 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for
 msvctest
 Assumes that libpng DLLs and LIBs are in ..\..\projects\msvc\win32\libpng
 Assumes that zlib DLLs and LIBs are in ..\..\projects\msvc\win32\zlib
 To build:
 1) On the main menu Select "Build|Set Active configuration".
   Choose the configuration that corresponds to the library you want to test.
   This library must have been built using the libpng MS project located in
   the "mscv" subdirectory.
 2) Select "Build|Clean"
 3) Select "Build|Rebuild All"
 4) The test results should appear in the "Build" pane of the Output Window.
 Simon-Pierre Cadieux
 Methodex Computer Systems Inc.
--- a/contrib/msvctest/msvctest.dsp
+++ b/contrib/msvctest/msvctest.dsp
@@ -0,0 +1,247 @@
 # Microsoft Developer Studio Project File - Name="msvctest" - Package Owner=<4>
 # Microsoft Developer Studio Generated Build File, Format Version 6.00
 # ** DO NOT EDIT **
 # TARGTYPE "Win32 (x86) Console Application" 0x0103
 CFG=msvctest - Win32 Debug DLL
 !MESSAGE This is not a valid makefile. To build this project using NMAKE,
 !MESSAGE use the Export Makefile command and run
 !MESSAGE 
 !MESSAGE NMAKE /f "msvctest.mak".
 !MESSAGE 
 !MESSAGE You can specify a configuration when running NMAKE
 !MESSAGE by defining the macro CFG on the command line. For example:
 !MESSAGE 
 !MESSAGE NMAKE /f "msvctest.mak" CFG="msvctest - Win32 Debug DLL"
 !MESSAGE 
 !MESSAGE Possible choices for configuration are:
 !MESSAGE 
 !MESSAGE "msvctest - Win32 DLL" (based on "Win32 (x86) Console Application")
 !MESSAGE "msvctest - Win32 Debug DLL" (based on "Win32 (x86) Console Application")
 !MESSAGE "msvctest - Win32 ASM DLL" (based on "Win32 (x86) Console Application")
 !MESSAGE "msvctest - Win32 Debug ASM DLL" (based on "Win32 (x86) Console Application")
 !MESSAGE "msvctest - Win32 LIB" (based on "Win32 (x86) Console Application")
 !MESSAGE "msvctest - Win32 Debug LIB" (based on "Win32 (x86) Console Application")
 !MESSAGE 
 # Begin Project
 # PROP AllowPerConfigDependencies 0
 # PROP Scc_ProjName ""
 # PROP Scc_LocalPath ""
 CPP=cl.exe
 RSC=rc.exe
 !IF  "$(CFG)" == "msvctest - Win32 DLL"
 # PROP BASE Use_MFC 0
 # PROP BASE Use_Debug_Libraries 0
 # PROP BASE Output_Dir "dll"
 # PROP BASE Intermediate_Dir "dll"
 # PROP BASE Target_Dir ""
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 0
 # PROP Output_Dir "dll"
 # PROP Intermediate_Dir "dll"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
 # ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
 # ADD BASE RSC /l 0x409 /d "NDEBUG"
 # ADD RSC /l 0x409 /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /machine:I386
 # ADD LINK32 ..\..\projects\msvc\win32\libpng\dll\libpng10.lib /nologo /subsystem:console /machine:I386
 # Begin Special Build Tool
 OutDir=.\dll
 SOURCE="$(InputPath)"
 PostBuild_Desc=[Run Test]
 PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll;..\..\projects\msvc\win32\zlib\dll;	$(outdir)\msvctest.exe ..\..\pngtest.png
 # End Special Build Tool
 !ELSEIF  "$(CFG)" == "msvctest - Win32 Debug DLL"
 # PROP BASE Use_MFC 0
 # PROP BASE Use_Debug_Libraries 1
 # PROP BASE Output_Dir "dll_dbg"
 # PROP BASE Intermediate_Dir "dll_dbg"
 # PROP BASE Target_Dir ""
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "dll_dbg"
 # PROP Intermediate_Dir "dll_dbg"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
 # ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
 # ADD BASE RSC /l 0x409 /d "_DEBUG"
 # ADD RSC /l 0x409 /d "_DEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 # ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbg\libpng10d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 # Begin Special Build Tool
 OutDir=.\dll_dbg
 SOURCE="$(InputPath)"
 PostBuild_Desc=[Run Test]
 PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbg;..\..\projects\msvc\win32\zlib\dll_dbg;	$(outdir)\msvctest.exe ..\..\pngtest.png
 # End Special Build Tool
 !ELSEIF  "$(CFG)" == "msvctest - Win32 ASM DLL"
 # PROP BASE Use_MFC 0
 # PROP BASE Use_Debug_Libraries 0
 # PROP BASE Output_Dir "dll_asm"
 # PROP BASE Intermediate_Dir "dll_asm"
 # PROP BASE Target_Dir ""
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 0
 # PROP Output_Dir "dll_asm"
 # PROP Intermediate_Dir "dll_asm"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
 # ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
 # ADD BASE RSC /l 0x409 /d "NDEBUG"
 # ADD RSC /l 0x409 /d "NDEBUG"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /machine:I386
 # ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_asm\libpng10a.lib /nologo /subsystem:console /machine:I386
 # Begin Special Build Tool
 OutDir=.\dll_asm
 SOURCE="$(InputPath)"
 PostBuild_Desc=[Run Test]
 PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_asm;..\..\projects\msvc\win32\zlib\dll_asm;	$(outdir)\msvctest.exe ..\..\pngtest.png
 # End Special Build Tool
 !ELSEIF  "$(CFG)" == "msvctest - Win32 Debug ASM DLL"
 # PROP BASE Use_MFC 0
 # PROP BASE Use_Debug_Libraries 1
 # PROP BASE Output_Dir "dll_dbga"
 # PROP BASE Intermediate_Dir "dll_dbga"
 # PROP BASE Target_Dir ""
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "dll_dbga"
 # PROP Intermediate_Dir "dll_dbga"
 # PROP Ignore_Export_Lib 0
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 # ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
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 # ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
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 OutDir=.\lib_dbg
 SOURCE="$(InputPath)"
 PostBuild_Desc=[Run Test]
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 # Begin Target
 # Name "msvctest - Win32 DLL"
 # Name "msvctest - Win32 Debug DLL"
 # Name "msvctest - Win32 ASM DLL"
 # Name "msvctest - Win32 Debug ASM DLL"
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 # Begin Group "Source Files"
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 # Begin Source File
 SOURCE=..\..\pngtest.c
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 SOURCE=.\README.txt
 # PROP Exclude_From_Build 1
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--- a/contrib/msvctest/msvctest.dsw
+++ b/contrib/msvctest/msvctest.dsw
@@ -0,0 +1,29 @@
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 # WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
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--- a/contrib/pngminim/README
+++ b/contrib/pngminim/README
@@ -1,4 +0,0 @@
 This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
 to build minimal decoder, encoder, and progressive reader applications.
 See the individual README and pngusr.dfa files for more explanation.
--- a/contrib/pngminim/decoder/README
+++ b/contrib/pngminim/decoder/README
@@ -1,10 +0,0 @@
 This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
 The makefile builds a minimal read-only decoder with embedded libpng
 and zlib.
 Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
 on the make command line.
 If you prefer to use the shared libraries, go to contrib/pngminus
 and build the png2pnm application there.
--- a/contrib/pngminim/decoder/makefile
+++ b/contrib/pngminim/decoder/makefile
@@ -1,151 +0,0 @@
 # Makefile for PngMinus (pngm2pnm)
 # Linux / Unix
 #CC=cc
 CC=gcc
 LD=$(CC)
 # If awk fails try
 # make AWK=nawk
 # If cpp fails try
 # make CPP=/lib/cpp
 RM=rm -f
 COPY=cp
 CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
 CFLAGS=-O1 -Wall
 C=.c
 O=.o
 L=.a
 E=
 # Where to find the source code:
 PNGSRC =../../..
 ZLIBSRC=$(PNGSRC)/../zlib
 PROGSRC=$(PNGSRC)/contrib/pngminus
 # Zlib (minimal inflate requirements - crc32 is used by libpng)
 # zutil can be eliminated if you provide your own zcalloc and zcfree
 ZSRCS  = adler32$(C) crc32$(C) \
 	 inffast$(C) inflate$(C) inftrees$(C) \
 	 zutil$(C)
 # Standard headers
 ZH     = zlib.h crc32.h inffast.h inffixed.h \
 	 inflate.h inftrees.h zutil.h
 # Machine generated headers
 ZCONF  = zconf.h
 # Headers callers use
 ZINC   = zlib.h $(ZCONF)
 # Headers the Zlib source uses
 ZHDRS  = $(ZH) $(ZCONF)
 ZOBJS  = adler32$(O) crc32$(O) \
 	 inffast$(O) inflate$(O) inftrees$(O) \
 	 zutil$(O)
 # libpng
 PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
 	pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
 	pngset$(C) pngtrans$(C)
 # Standard headers
 PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
 # Machine generated headers
 PNGCONF=pnglibconf.h
 # Headers callers use
 PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
 # Headers the PNG library uses
 PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
 PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
 	pngset$(O) pngtrans$(O)
 PROGSRCS= pngm2pnm$(C)
 PROGHDRS=
 PROGDOCS=
 PROGOBJS= pngm2pnm$(O)
 OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 # implicit make rules -------------------------------------------------------
 # note: dependencies do not work on implicit rule lines
 .c$(O):
 	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
 # dependencies
 all: pngm2pnm$(E)
 pngm2pnm$(E): $(OBJS)
 	$(LD) -o pngm2pnm$(E) $(OBJS)
 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
 # 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)\
 	$(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."\
 	    DFA_XTRA="pngusr.dfa" $@
 clean:
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
 	    srcdir=$(PNGSRC) clean
 	$(RM) pngm2pnm$(O)
 	$(RM) pngm2pnm$(E)
 	$(RM) $(OBJS)
 # distclean also removes the copied source and headers
 distclean: clean
 	$(RM) -r scripts # historical reasons
 	$(RM) $(PNGSRCS) $(PNGH)
 	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
 	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
 # Header file dependencies:
 $(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
 $(PNGOBJS): $(PNGHDRS) $(ZINC)
 $(ZOBJS): $(ZHDRS)
 # Gather the source code from the respective directories
 $(PNGSRCS) $(PNGH): $(PNGSRC)/$@
 	$(RM) $@
 	$(COPY) $(PNGSRC)/$@ $@
 # No dependency on the ZLIBSRC target so that it only needs
 # to be specified once.
 $(ZSRCS) $(ZH):
 	$(RM) $@
 	$(COPY) $(ZLIBSRC)/$@ $@
 # The unconfigured zconf.h varies in name according to the
 # zlib release
 $(ZCONF):
 	$(RM) $@
 	@for f in zconf.h.in zconf.in.h zconf.h; do\
 	    test -r $(ZLIBSRC)/$$f &&\
 	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
 	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
 	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
 pngm2pnm.c: $(PROGSRC)/png2pnm.c
 	$(RM) $@
 	$(COPY) $(PROGSRC)/png2pnm.c $@
 # End of makefile for pngm2pnm
--- a/contrib/pngminim/decoder/pngusr.dfa
+++ b/contrib/pngminim/decoder/pngusr.dfa
@@ -1,39 +0,0 @@
 # pngminim/decoder/pngusr.dfa
 #
 # Copyright (c) 2010-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h
 # First all the build options off:
 everything = off
 # All that is required is some read code. This example switches
 # on the sequential read code (see ../preader for a progressive
 # read example).
 option SEQUENTIAL_READ on
 # You must choose fixed or floating point arithmetic:
 # option FLOATING_POINT on
 option FIXED_POINT on
 # You must chose the internal fixed point implementation or to
 # use the system floating point.  The latter is considerably
 # smaller (by about 1kbyte on an x86 system):
 # option FLOATING_ARITHMETIC on
 option FLOATING_ARITHMETIC off
 # Your program will probably need other options.  The example
 # program here, pngm2pnm, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
 option SETJMP on
 option STDIO on
 option READ_EXPAND on
 option READ_STRIP_16_TO_8 on
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -1,24 +0,0 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
 * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
 */
 #ifndef MINRDPNGCONF_H
 #define MINRDPNGCONF_H
 /* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
 #define PNG_NO_WARNINGS
 #define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 #endif /* MINRDPNGCONF_H */
--- a/contrib/pngminim/encoder/README
+++ b/contrib/pngminim/encoder/README
@@ -1,10 +0,0 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 The makefile builds a minimal write-only encoder with embedded libpng
 and zlib.
 Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
 on the make command line.
 If you prefer to use the shared libraries, go to contrib/pngminus
 and build the pnm2png application there.
--- a/contrib/pngminim/encoder/makefile
+++ b/contrib/pngminim/encoder/makefile
@@ -1,150 +0,0 @@
 # Makefile for PngMinus (pnm2pngm)
 # Linux / Unix
 #CC=cc
 CC=gcc
 LD=$(CC)
 # If awk fails try
 # make AWK=nawk
 # If cpp fails try
 # make CPP=/lib/cpp
 RM=rm -f
 COPY=cp
 CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
 CFLAGS=-O1 -Wall
 C=.c
 O=.o
 L=.a
 E=
 # Where to find the source code:
 PNGSRC =../../..
 ZLIBSRC=$(PNGSRC)/../zlib
 PROGSRC=$(PNGSRC)/contrib/pngminus
 # Zlib
 ZSRCS  = adler32$(C) compress$(C) crc32$(C) deflate$(C) \
 	 trees$(C) zutil$(C)
 # Standard headers
 #ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
 ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
 # Machine generated headers
 ZCONF  = zconf.h
 # Headers callers use
 ZINC   = zlib.h $(ZCONF)
 # Headers the Zlib source uses
 ZHDRS  = $(ZH) $(ZCONF)
 # compress is not required; it is needed to link the zlib
 # code because deflate defines an unused API function deflateBound
 # which itself calls compressBound from compress.
 ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
 	 trees$(O) zutil$(O)
 # libpng
 PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
 	pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \
 	pngwtran$(C) pngwutil$(C)
 # Standard headers
 PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
 # Machine generated headers
 PNGCONF=pnglibconf.h
 # Headers callers use
 PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
 # Headers the PNG library uses
 PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
 PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
 	pngwtran$(O) pngwutil$(O)
 PROGSRCS= pnm2pngm$(C)
 PROGHDRS=
 PROGDOCS=
 PROGOBJS= pnm2pngm$(O)
 OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 # implicit make rules -------------------------------------------------------
 .c$(O):
 	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
 # dependencies
 all: pnm2pngm$(E)
 pnm2pngm$(E): $(OBJS)
 	$(LD) -o pnm2pngm$(E) $(OBJS)
 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
 # 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)\
 	$(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."\
 	    DFA_XTRA="pngusr.dfa" $@
 clean:
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
 	    srcdir=$(PNGSRC) clean
 	$(RM) pnm2pngm$(O)
 	$(RM) pnm2pngm$(E)
 	$(RM) $(OBJS)
 # distclean also removes the copied source and headers
 distclean: clean
 	$(RM) -r scripts # historical reasons
 	$(RM) $(PNGSRCS) $(PNGH)
 	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
 	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
 # Header file dependencies:
 $(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
 $(PNGOBJS): $(PNGHDRS) $(ZINC)
 $(ZOBJS): $(ZHDRS)
 # Gather the source code from the respective directories
 $(PNGSRCS) $(PNGH): $(PNGSRC)/$@
 	$(RM) $@
 	$(COPY) $(PNGSRC)/$@ $@
 # No dependency on the ZLIBSRC target so that it only needs
 # to be specified once.
 $(ZSRCS) $(ZH):
 	$(RM) $@
 	$(COPY) $(ZLIBSRC)/$@ $@
 # The unconfigured zconf.h varies in name according to the
 # zlib release
 $(ZCONF):
 	$(RM) $@
 	@for f in zconf.h.in zconf.in.h zconf.h; do\
 	    test -r $(ZLIBSRC)/$$f &&\
 	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
 	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
 	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
 pnm2pngm.c: $(PROGSRC)/pnm2png.c
 	$(RM) $@
 	$(COPY) $(PROGSRC)/pnm2png.c $@
 # End of makefile for pnm2pngm
--- a/contrib/pngminim/encoder/pngusr.dfa
+++ b/contrib/pngminim/encoder/pngusr.dfa
@@ -1,38 +0,0 @@
 # pngminim/encoder/pngusr.dfa
 #
 # Copyright (c) 2010-2013 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
 # First all the build options off:
 everything = off
 # Switch on the write code - this makes a minimalist encoder
 option WRITE on
 # These 2 options are required if you need to read PGM (P1 or P4) PGM files.
 option WRITE_INVERT on
 option WRITE_PACK on
 # You must choose fixed or floating point arithmetic:
 # option FLOATING_POINT on
 option FIXED_POINT on
 # You must chose the internal fixed point implementation or to
 # use the system floating point.  The latter is considerably
 # smaller (by about 1kbyte on an x86 system):
 # option FLOATING_ARITHMETIC on
 option FLOATING_ARITHMETIC off
 # Your program will probably need other options.  The example
 # program here, pnm2pngm, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
 option SETJMP on
 option STDIO on
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -1,24 +0,0 @@
 /* minwrpngconf.h: headers to make a minimal png-write-only library
 *
 * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
 */
 #ifndef MINWRPNGCONF_H
 #define MINWRPNGCONF_H
 /* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
 #define PNG_NO_WARNINGS
 #define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 #endif /* MINWRPNGCONF_H */
--- a/contrib/pngminim/preader/README
+++ b/contrib/pngminim/preader/README
@@ -1,15 +0,0 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 The makefile builds a minimal read-only progressive decoder with
 embedded libpng, zlib and your system's X library.
 Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
 on the make command line.
 Edit makefile if required, to find your X library and include files,
 then
    make ZLIBSRC=directory
 If you prefer to use the shared libraries, go to contrib/gregbook
 and build the rpng2-x application there.
--- a/contrib/pngminim/preader/makefile
+++ b/contrib/pngminim/preader/makefile
@@ -1,166 +0,0 @@
 # Makefile for PngMinus (rpng2)
 # Linux / Unix
 #CC=cc
 CC=gcc
 LD=$(CC)
 # If awk fails try
 # make AWK=nawk
 # If cpp fails try
 # make CPP=/lib/cpp
 RM=rm -f
 COPY=cp
 #XINC = -I/usr/include			# old-style, stock X distributions
 #XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
 #XINC = -I/usr/openwin/include		# Sun workstations (OpenWindows)
 #XLIB = -L/usr/openwin/lib -lX11
 XINC = -I/usr/X11R6/include		# new X distributions (X.org, etc.)
 XLIB = -L/usr/X11R6/lib -lX11
 #XLIB = -L/usr/X11R6/lib64 -lX11	# e.g., Red Hat on AMD64
 #XINC = -I/usr/local/include   		# FreeBSD
 #XLIB = -L/usr/local/lib -lX11
 #LIBS = $(XLIB)
 LIBS = $(XLIB) -lm                      #platforms that need libm
 CPPFLAGS=-I. $(XINC) -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
 CFLAGS=-O1 -Wall
 C=.c
 O=.o
 L=.a
 E=
 # Where to find the source code:
 PNGSRC =../../..
 ZLIBSRC=$(PNGSRC)/../zlib
 PROGSRC=$(PNGSRC)/contrib/gregbook
 # Zlib (minimal inflate requirements - crc32 is used by libpng)
 # zutil can be eliminated if you provide your own zcalloc and zcfree
 ZSRCS  = adler32$(C) crc32$(C) \
 	 inffast$(C) inflate$(C) inftrees$(C) \
 	 zutil$(C)
 # Standard headers
 ZH     = zlib.h crc32.h inffast.h inffixed.h \
 	 inflate.h inftrees.h zutil.h
 # Machine generated headers
 ZCONF  = zconf.h
 # Headers callers use
 ZINC   = zlib.h $(ZCONF)
 # Headers the Zlib source uses
 ZHDRS  = $(ZH) $(ZCONF)
 ZOBJS  = adler32$(O) crc32$(O) \
 	 inffast$(O) inflate$(O) inftrees$(O) \
 	 zutil$(O)
 # libpng
 PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
 	pngpread$(C) pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
 	pngset$(C) pngtrans$(C)
 # Standard headers
 PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
 # Machine generated headers
 PNGCONF=pnglibconf.h
 # Headers callers use
 PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
 # Headers the PNG library uses
 PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
 PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
 	pngset$(O) pngtrans$(O)
 PROGSRCS= rpng2-x$(C) readpng2$(C)
 PROGHDRS= readpng2.h
 PROGDOCS= COPYING LICENSE
 PROGOBJS= rpng2-x$(O) readpng2$(O)
 OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 # implicit make rules -------------------------------------------------------
 .c$(O):
 	$(CC) $(CPPFLAGS) -c $(CFLAGS) $<
 # dependencies
 all: $(PROGDOCS) rpng2-x$(E)
 rpng2-x$(E): $(OBJS)
 	$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
 # The DFA_XTRA setting turns all libpng options off then
 # turns on those required for this minimal build.
 # 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)\
 	$(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."\
 	    DFA_XTRA="pngusr.dfa" $@
 clean:
 	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
 	    srcdir=$(PNGSRC) clean
 	$(RM) rpng2-x$(O)
 	$(RM) rpng2-x$(E)
 	$(RM) $(OBJS)
 # distclean also removes the copied source and headers
 distclean: clean
 	$(RM) -r scripts # historical reasons
 	$(RM) $(PNGSRCS) $(PNGH)
 	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
 	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
 # Header file dependencies:
 $(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
 $(PNGOBJS): $(PNGHDRS) $(ZINC)
 $(ZOBJS): $(ZHDRS)
 # Gather the source code from the respective directories
 $(PNGSRCS) $(PNGH): $(PNGSRC)/$@
 	$(RM) $@
 	$(COPY) $(PNGSRC)/$@ $@
 # No dependency on the ZLIBSRC target so that it only needs
 # to be specified once.
 $(ZSRCS) $(ZH):
 	$(RM) $@
 	$(COPY) $(ZLIBSRC)/$@ $@
 # The unconfigured zconf.h varies in name according to the
 # zlib release
 $(ZCONF):
 	$(RM) $@
 	@for f in zconf.h.in zconf.in.h zconf.h; do\
 	    test -r $(ZLIBSRC)/$$f &&\
 	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
 	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
 	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
 $(PROGSRCS) $(PROGHDRS) $(PROGDOCS): $(PROGSRC)/$@
 	$(RM) $@
 	$(COPY) $(PROGSRC)/$@ $@
 # End of makefile for rpng2-x
--- a/contrib/pngminim/preader/pngusr.dfa
+++ b/contrib/pngminim/preader/pngusr.dfa
@@ -1,40 +0,0 @@
 # pngminim/preader/pngusr.dfa
 #
 # Copyright (c) 2010-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h
 # First all the build options off:
 everything = off
 # Just switch on the progressive read code
 option PROGRESSIVE_READ on
 # You may choose fixed or floating point APIs:
 # option FLOATING_POINT on
 option FIXED_POINT on
 # You must chose the internal fixed point implementation or to
 # use the system floating point.  The latter is considerably
 # smaller (by about 1kbyte on an x86 system):
 option FLOATING_ARITHMETIC on
 # option FLOATING_ARITHMETIC off
 # Your program will probably need other options.  The example
 # program here, rpng2-x, requires the following.  Take a look
 # at pnglibconf.h to find out the full set of what has to be
 # enabled to make the following work.
 option SETJMP on
 option STDIO on
 option READ_bKGD on
 option READ_GAMMA on
 option READ_EXPAND on
 option READ_STRIP_16_TO_8 on
 option READ_GRAY_TO_RGB on
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -1,24 +0,0 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
 * Copyright (c) 2009, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
 */
 #ifndef MINPRDPNGCONF_H
 #define MINPRDPNGCONF_H
 /* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 /* List options to turn off features of the build that do not
 * affect the API (so are not recorded in pnglibconf.h)
 */
 #define PNG_NO_WARNINGS
 #define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 #endif /* MINPRDPNGCONF_H */
--- a/contrib/pngminus/README
+++ b/contrib/pngminus/README
@@ -20,7 +20,7 @@ Soon after the creation of PNG in 1995, the need was felt for a set of
 pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
 (Willem van Schaik) started such a project. Luckily we discovered this
 and merged the two together into pnmtopng.tar.gz, which is available
-from a/o ftp://ftp.simplesystems.org/pub/libpng/png/.
+from a/o ftp://swrinde.nde.swri.edu/pub/png/.
 These two utilities have many, many options and make use of most of the
 features of PNG, like gamma, alpha, sbit, text-chunks, etc. This makes
--- a/contrib/pngminus/makefile.std
+++ b/contrib/pngminus/makefile.std
@@ -8,9 +8,9 @@ LD=$(CC)
 RM=rm -f
 #PNGPATH = /usr/local
-#PNGINC = -I$(PNGPATH)/include/libpng15
+#PNGINC = -I$(PNGPATH)/include/libpng10
-#PNGLIB = -L$(PNGPATH)/lib -lpng15
+#PNGLIB = -L$(PNGPATH)/lib -lpng10
-#PNGLIBS = $(PNGPATH)/lib/libpng15.a
+#PNGLIBS = $(PNGPATH)/lib/libpng10.a
 PNGINC = -I../..
 PNGLIB = -L../.. -lpng
 PNGLIBS = ../../libpng.a
@@ -23,9 +23,9 @@ ZINC = -I../../../zlib
 ZLIB = -L../../../zlib -lz
 ZLIBS = ../../../zlib/libz.a
-CFLAGS=$(PNGINC) $(ZINC)
+CFLAGS=-O3 $(PNGINC) $(ZINC)
-LDLIBS=$(PNGLIB) $(ZLIB)
+LDFLAGS=$(PNGLIB) $(ZLIB)
-LDLIBSS=$(PNGLIBS) $(ZLIBS)
+LDFLAGSS=$(PNGLIBS) $(ZLIBS)
 C=.c
 O=.o
 L=.a
@@ -40,19 +40,19 @@ png2pnm$(O): png2pnm$(C)
 	$(CC) -c $(CFLAGS) png2pnm$(C)
 png2pnm$(E): png2pnm$(O)
-	$(LD) $(LDFLAGS) -o png2pnm$(E) png2pnm$(O) $(LDLIBS) -lm
+	$(LD) -o png2pnm$(E) png2pnm$(O) $(LDFLAGS) -lm
 png2pnm-static$(E): png2pnm$(O)
-	$(LD) $(LDFLAGS) -o png2pnm-static$(E) png2pnm$(O) $(LDLIBSS) -lm
+	$(LD) -o png2pnm-static$(E) png2pnm$(O) $(LDFLAGSS) -lm
 pnm2png$(O): pnm2png$(C)
 	$(CC) -c $(CFLAGS) pnm2png$(C)
 pnm2png$(E): pnm2png$(O)
-	$(LD) $(LDFLAGS) -o pnm2png$(E) pnm2png$(O) $(LDLIBS) -lm
+	$(LD) -o pnm2png$(E) pnm2png$(O) $(LDFLAGS) -lm
 pnm2png-static$(E): pnm2png$(O)
-	$(LD) $(LDFLAGS) -o pnm2png-static$(E) pnm2png$(O) $(LDLIBSS) -lm
+	$(LD) -o pnm2png-static$(E) pnm2png$(O) $(LDFLAGSS) -lm
 clean:
 	$(RM) png2pnm$(O)
--- a/contrib/pngminus/png2pnm.c
+++ b/contrib/pngminus/png2pnm.c
@@ -144,7 +144,7 @@ int main(int argc, char *argv[])
  if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE)
  {
    fprintf (stderr, "PNG2PNM\n");
-    fprintf (stderr, "Error:  unsuccessful conversion of PNG-image\n");
+    fprintf (stderr, "Error:  unsuccessful convertion of PNG-image\n");
    exit(1);
  }
@@ -188,7 +188,7 @@ void usage()
 BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha)
 {
  png_struct    *png_ptr = NULL;
-  png_info        *info_ptr = NULL;
+  png_info	*info_ptr = NULL;
  png_byte      buf[8];
  png_byte      *png_pixels = NULL;
  png_byte      **row_pointers = NULL;
@@ -211,8 +211,8 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
  if (ret != 8)
    return FALSE;
-  ret = png_sig_cmp (buf, 0, 8);
+  ret = png_check_sig (buf, 8);
-  if (ret)
+  if (!ret)
    return FALSE;
  /* create png and info structures */
@@ -381,7 +381,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
          fputc ((int) *pix_ptr++ , pnm_file);
        else
          if (bit_depth == 16){
-            dep_16 = (long) *pix_ptr++;
+	    dep_16 = (long) *pix_ptr++;
            fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
          }
          else
@@ -401,9 +401,9 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
            fputc ((int) *pix_ptr++ , alpha_file);
          else
            if (bit_depth == 16){
-              dep_16 = (long) *pix_ptr++;
+	      dep_16 = (long) *pix_ptr++;
              fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
-            }
+	    }  
            else
              fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
        }
--- a/contrib/pngminus/png2pnm.sh
+++ b/contrib/pngminus/png2pnm.sh
@@ -1,4 +1,3 @@
 #!/bin/sh
 # -- grayscale
 ./png2pnm -noraw ../pngsuite/basn0g01.png basn0g01.pgm
 ./png2pnm -noraw ../pngsuite/basn0g02.png basn0g02.pgm
--- a/contrib/pngminus/pngminus.sh
+++ b/contrib/pngminus/pngminus.sh
@@ -1,4 +1,3 @@
 #!/bin/sh
 make -f makefile.std
 sh png2pnm.sh
 sh pnm2png.sh
--- a/contrib/pngminus/pnm2png.c
+++ b/contrib/pngminus/pnm2png.c
@@ -3,7 +3,6 @@
 *  copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
 *
 *  version 1.0 - 1999.10.15 - First version.
 *  version 1.1 - 2015.07.29 - Fixed leaks (Glenn Randers-Pehrson)
 *
 *  Permission to use, copy, modify, and distribute this software and
 *  its documentation for any purpose and without fee is hereby granted,
@@ -19,7 +18,6 @@
 #include <mem.h>
 #include <fcntl.h>
 #endif
 #include <zlib.h>
 #ifndef BOOL
 #define BOOL unsigned char
@@ -51,8 +49,7 @@
 int  main (int argc, char *argv[]);
 void usage ();
-BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
+BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha);
    BOOL alpha);
 void get_token(FILE *pnm_file, char *token);
 png_uint_32 get_data (FILE *pnm_file, int depth);
 png_uint_32 get_value (FILE *pnm_file, int depth);
@@ -178,8 +175,7 @@ void usage()
  fprintf (stderr, "   or:  ... | pnm2png [options]\n");
  fprintf (stderr, "Options:\n");
  fprintf (stderr, "   -i[nterlace]   write png-file with interlacing on\n");
-  fprintf (stderr,
+  fprintf (stderr, "   -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
      "   -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
  fprintf (stderr, "   -h | -?  print this help-information\n");
 }
@@ -187,36 +183,29 @@ void usage()
 *  pnm2png
 */
-BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
+BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha)
     BOOL alpha)
 {
  png_struct    *png_ptr = NULL;
  png_info      *info_ptr = NULL;
  png_byte      *png_pixels = NULL;
  png_byte      **row_pointers = NULL;
  png_byte      *pix_ptr = NULL;
-  volatile png_uint_32   row_bytes;
+  png_uint_32   row_bytes;
  char          type_token[16];
  char          width_token[16];
  char          height_token[16];
  char          maxval_token[16];
-  volatile int    color_type=1;
+  int           color_type;
-  unsigned long   ul_width=0, ul_alpha_width=0;
+  png_uint_32   width, alpha_width;
-  unsigned long   ul_height=0, ul_alpha_height=0;
+  png_uint_32   height, alpha_height;
  unsigned long   ul_maxval=0;
  volatile png_uint_32   width=0, height=0;
  volatile png_uint_32   alpha_width=0, alpha_height=0;
  png_uint_32   maxval;
-  volatile int           bit_depth = 0;
+  int           bit_depth = 0;
-  int           channels=0;
+  int           channels;
  int           alpha_depth = 0;
-  int           alpha_present=0;
+  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;
@@ -229,36 +218,20 @@ 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'))
  {
    raw = (type_token[1] == '5');
    color_type = PNG_COLOR_TYPE_GRAY;
    get_token(pnm_file, width_token);
-    sscanf (width_token, "%lu", &ul_width);
+    sscanf (width_token, "%lu", &width);
    width = (png_uint_32) ul_width;
    get_token(pnm_file, height_token);
-    sscanf (height_token, "%lu", &ul_height);
+    sscanf (height_token, "%lu", &height);
    height = (png_uint_32) ul_height;
    get_token(pnm_file, maxval_token);
-    sscanf (maxval_token, "%lu", &ul_maxval);
+    sscanf (maxval_token, "%lu", &maxval);
    maxval = (png_uint_32) ul_maxval;
    if (maxval <= 1)
      bit_depth = 1;
    else if (maxval <= 3)
@@ -275,14 +248,11 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
    raw = (type_token[1] == '6');
    color_type = PNG_COLOR_TYPE_RGB;
    get_token(pnm_file, width_token);
-    sscanf (width_token, "%lu", &ul_width);
+    sscanf (width_token, "%lu", &width);
    width = (png_uint_32) ul_width;
    get_token(pnm_file, height_token);
-    sscanf (height_token, "%lu", &ul_height);
+    sscanf (height_token, "%lu", &height);
    height = (png_uint_32) ul_height;
    get_token(pnm_file, maxval_token);
-    sscanf (maxval_token, "%lu", &ul_maxval);
+    sscanf (maxval_token, "%lu", &maxval);
    maxval = (png_uint_32) ul_maxval;
    if (maxval <= 1)
      bit_depth = 1;
    else if (maxval <= 3)
@@ -317,18 +287,15 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
    {
      alpha_raw = (type_token[1] == '5');
      get_token(alpha_file, width_token);
-      sscanf (width_token, "%lu", &ul_alpha_width);
+      sscanf (width_token, "%lu", &alpha_width);
      alpha_width=(png_uint_32) ul_alpha_width;
      if (alpha_width != width)
        return FALSE;
      get_token(alpha_file, height_token);
-      sscanf (height_token, "%lu", &ul_alpha_height);
+      sscanf (height_token, "%lu", &alpha_height);
      alpha_height = (png_uint_32) ul_alpha_height;
      if (alpha_height != height)
        return FALSE;
      get_token(alpha_file, maxval_token);
-      sscanf (maxval_token, "%lu", &ul_maxval);
+      sscanf (maxval_token, "%lu", &maxval);
      maxval = (png_uint_32) ul_maxval;
      if (maxval <= 1)
        alpha_depth = 1;
      else if (maxval <= 3)
@@ -357,108 +324,76 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
    channels = 3;
  else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
    channels = 4;
 #if 0
  else
-    channels = 0; /* cannot happen */
+    channels = 0; /* should not happen */
 #endif
  alpha_present = (channels - 1) % 2;
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
+  /* row_bytes is the width x number of channels x (bit-depth / 8) */
-  if (packed_bitmap)
+  row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
    /* 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);
-  if ((png_pixels = (png_byte *)
+  if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
     malloc (row_bytes * height * sizeof (png_byte))) == NULL)
    return FALSE;
  /* read data from PNM file */
  pix_ptr = png_pixels;
-  for (row = 0; row < (int) height; row++)
+  for (row = 0; row < height; row++)
  {
-#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
+    for (col = 0; col < width; col++)
    if (packed_bitmap) {
      for (i = 0; i < (int) 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 < (int) 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)
+        else
-            *pix_ptr++ = get_data (pnm_file, bit_depth);
+          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);
+            tmp16 = get_value (pnm_file, bit_depth);
-            else
+            *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
-            {
+            pix_ptr++;
-              tmp16 = get_value (pnm_file, bit_depth);
+            *pix_ptr = (png_byte) (tmp16 & 0xFF);
-              *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
+            pix_ptr++;
-              pix_ptr++;
+          }
-              *pix_ptr = (png_byte) (tmp16 & 0xFF);
+      }
              pix_ptr++;
            }
        }
-        if (alpha) /* read alpha-channel from pgm file */
+      if (alpha) /* read alpha-channel from pgm file */
-        {
+      {
-          if (alpha_raw)
+        if (alpha_raw)
-            *pix_ptr++ = get_data (alpha_file, alpha_depth);
+          *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);
+            tmp16 = get_value (alpha_file, bit_depth);
-            else
+            *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
-            {
+            *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
-              tmp16 = get_value (alpha_file, bit_depth);
+          }
-              *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
+      } /* if alpha */
-              *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
+
            }
        } /* if alpha */
      } /* if packed_bitmap */
    } /* end for col */
  } /* end for row */
  /* prepare the standard PNG structures */
-  png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
+  png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
      NULL);
  if (!png_ptr)
  {
    free (png_pixels);
    png_pixels = NULL;
    return FALSE;
  }
  info_ptr = png_create_info_struct (png_ptr);
  if (!info_ptr)
  {
    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
    free (png_pixels);
    png_pixels = NULL;
    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)))
  {
-    png_destroy_write_struct (&png_ptr, &info_ptr);
+    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
    free (png_pixels);
    png_pixels = NULL;
    return FALSE;
  }
@@ -476,28 +411,25 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
  /* if needed we will allocate memory for an new array of row-pointers */
  if (row_pointers == (unsigned char**) NULL)
  {
-    if ((row_pointers = (png_byte **)
+    if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
        malloc (height * sizeof (png_bytep))) == NULL)
    {
-      png_destroy_write_struct (&png_ptr, &info_ptr);
+      png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
      free (png_pixels);
      png_pixels = NULL;
      return FALSE;
    }
  }
  /* set the individual row_pointers to point at the correct offsets */
-  for (i = 0; i < (int) height; i++)
+  for (i = 0; i < (height); i++)
    row_pointers[i] = png_pixels + i * row_bytes;
  /* write out the entire image data in one call */
  png_write_image (png_ptr, row_pointers);
-  /* write the additional chunks to the PNG file (not really needed) */
+  /* write the additional chuncks to the PNG file (not really needed) */
  png_write_end (png_ptr, info_ptr);
  /* clean up after the write, and free any memory allocated */
-  png_destroy_write_struct (&png_ptr, &info_ptr);
+  png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
  if (row_pointers != (unsigned char**) NULL)
    free (row_pointers);
@@ -514,32 +446,19 @@ 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);
+    token[i] = (unsigned char) 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;
  }
  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] != ' '));
@@ -591,7 +510,6 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
 {
  static png_uint_32 mask = 0;
  png_byte token[16];
  unsigned long ul_ret_value;
  png_uint_32 ret_value;
  int i = 0;
@@ -600,8 +518,7 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
      mask = (mask << 1) | 0x01;
  get_token (pnm_file, (char *) token);
-  sscanf ((const char *) token, "%lu", &ul_ret_value);
+  sscanf ((const char *) token, "%lu", &ret_value);
  ret_value = (png_uint_32) ul_ret_value;
  ret_value &= mask;
--- a/contrib/pngminus/pnm2png.sh
+++ b/contrib/pngminus/pnm2png.sh
@@ -1,4 +1,3 @@
 #!/bin/sh
 # -- grayscale
 ./pnm2png basn0g01.pgm basn0g01.png
 ./pnm2png basn0g02.pgm basn0g02.png
--- a/contrib/pngsuite/README
+++ b/contrib/pngsuite/README
@@ -1,61 +1,41 @@
 pngsuite
 --------
-(c) Willem van Schaik, 1999, 2011, 2012
+(c) Willem van Schaik, 1999
 Two images are by Glenn Randers-Pehrson, 2012
-Permission to use, copy, modify, and distribute these images for any
+Permission to use, copy, and distribute these images for any purpose and
-purpose and without fee is hereby granted.
+without fee is hereby granted.
-The 15 "bas*.png" images are part of the much larger PngSuite test-set of
+These 15 images are part of the much larger PngSuite test-set of 
 images, available for developers of PNG supporting software. The 
 complete set, available at http:/www.schaik.com/pngsuite/, contains 
 a variety of images to test interlacing, gamma settings, ancillary
 chunks, etc.
 The "ft*.png" images are "free/libre" replacements for the transparent
 corresponding t*.png images in the PngSuite.
 The images in this directory represent the basic PNG color-types:
 grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
 (1-8 bit) and grayscale or color images with alpha channel. You
 can use them to test the proper functioning of PNG software.
-    filename       depth type
+    filename      depth type
    ------------ ------ --------------
-    basn0g01.png   1-bit grayscale
+    basn0g01.png  1-bit grayscale
-    basn0g02.png   2-bit grayscale
+    basn0g02.png  2-bit grayscale
-    basn0g04.png   4-bit grayscale
+    basn0g04.png  4-bit grayscale
-    basn0g08.png   8-bit grayscale
+    basn0g08.png  8-bit grayscale
-    basn0g16.png  16-bit grayscale
+    basn0g16.png 16-bit grayscale
-    basn2c08.png   8-bit truecolor
+    basn2c08.png  8-bit truecolor
-    basn2c16.png  16-bit truecolor
+    basn2c16.png 16-bit truecolor
-    basn3p01.png   1-bit paletted
+    basn3p01.png  1-bit paletted
-    basn3p02.png   2-bit paletted
+    basn3p02.png  2-bit paletted
-    basn3p04.png   4-bit paletted
+    basn3p04.png  4-bit paletted
-    basn3p08.png   8-bit paletted
+    basn3p08.png  8-bit paletted
-    basn4a08.png   8-bit gray with alpha
+    basn4a08.png  8-bit gray with alpha
-    basn4a16.png  16-bit gray with alpha
+    basn4a16.png 16-bit gray with alpha
-    basn6a08.png   8-bit RGBA
+    basn6a08.png  8-bit RGBA
-    basn6a16.png  16-bit RGBA
+    basn6a16.png 16-bit RGBA
-    ftbbn0g01.png  1-bit grayscale, black bKGD
+Here is the correct result of typing "pngtest -m *.png" in
    ftbbn0g02.png  2-bit grayscale, black bKGD
    ftbbn0g04.png  4-bit grayscale, black bKGD
    ftbbn2c16.png 16-bit truecolor, black bKGD
    ftbbn3p08.png  8-bit paletted, black bKGD
    ftbgn2c16.png 16-bit truecolor, gray bKGD
    ftbgn3p08.png  8-bit paletted, gray bKGD
    ftbrn2c08.png  8-bit truecolor, red bKGD
    ftbwn0g16.png 16-bit gray, white bKGD
    ftbwn3p08.png  8-bit paletted, white bKGD
    ftbyn3p08.png  8-bit paletted, yellow bKGD
    ftp0n0g08.png  8-bit grayscale, opaque
    ftp0n2c08.png  8-bit truecolor, opaque
    ftp0n3p08.png  8-bit paletted, opaque
    ftp1n3p08.png  8-bit paletted, no bKGD
 Here is the correct result of typing "pngtest -m bas*.png" in
 this directory:
 Testing basn0g01.png: PASS (524 zero samples)
--- a/contrib/pngsuite/basn0g01.png
+++ b/contrib/pngsuite/basn0g01.png
--- a/contrib/pngsuite/basn0g02.png
+++ b/contrib/pngsuite/basn0g02.png
--- a/contrib/pngsuite/basn0g04.png
+++ b/contrib/pngsuite/basn0g04.png
--- a/contrib/pngsuite/basn0g08.png
+++ b/contrib/pngsuite/basn0g08.png
--- a/contrib/pngsuite/basn0g16.png
+++ b/contrib/pngsuite/basn0g16.png
--- a/contrib/pngsuite/basn2c08.png
+++ b/contrib/pngsuite/basn2c08.png
--- a/contrib/pngsuite/basn2c16.png
+++ b/contrib/pngsuite/basn2c16.png
--- a/contrib/pngsuite/basn3p01.png
+++ b/contrib/pngsuite/basn3p01.png
--- a/contrib/pngsuite/basn3p02.png
+++ b/contrib/pngsuite/basn3p02.png
--- a/contrib/pngsuite/basn3p04.png
+++ b/contrib/pngsuite/basn3p04.png
--- a/contrib/pngsuite/basn3p08.png
+++ b/contrib/pngsuite/basn3p08.png
--- a/contrib/pngsuite/basn4a08.png
+++ b/contrib/pngsuite/basn4a08.png
--- a/contrib/pngsuite/basn4a16.png
+++ b/contrib/pngsuite/basn4a16.png
--- a/contrib/pngsuite/basn6a08.png
+++ b/contrib/pngsuite/basn6a08.png
--- a/contrib/pngsuite/basn6a16.png
+++ b/contrib/pngsuite/basn6a16.png
--- a/contrib/pngsuite/ftbbn0g01.png
+++ b/contrib/pngsuite/ftbbn0g01.png
--- a/contrib/pngsuite/ftbbn0g02.png
+++ b/contrib/pngsuite/ftbbn0g02.png
--- a/contrib/pngsuite/ftbbn0g04.png
+++ b/contrib/pngsuite/ftbbn0g04.png
--- a/contrib/pngsuite/ftbbn2c16.png
+++ b/contrib/pngsuite/ftbbn2c16.png
--- a/contrib/pngsuite/ftbbn3p08.png
+++ b/contrib/pngsuite/ftbbn3p08.png
--- a/contrib/pngsuite/ftbgn2c16.png
+++ b/contrib/pngsuite/ftbgn2c16.png
--- a/contrib/pngsuite/ftbgn3p08.png
+++ b/contrib/pngsuite/ftbgn3p08.png
--- a/contrib/pngsuite/ftbrn2c08.png
+++ b/contrib/pngsuite/ftbrn2c08.png
--- a/contrib/pngsuite/ftbwn0g16.png
+++ b/contrib/pngsuite/ftbwn0g16.png
--- a/contrib/pngsuite/ftbwn3p08.png
+++ b/contrib/pngsuite/ftbwn3p08.png
--- a/contrib/pngsuite/ftbyn3p08.png
+++ b/contrib/pngsuite/ftbyn3p08.png
--- a/contrib/pngsuite/ftp0n0g08.png
+++ b/contrib/pngsuite/ftp0n0g08.png
--- a/contrib/pngsuite/ftp0n2c08.png
+++ b/contrib/pngsuite/ftp0n2c08.png
--- a/contrib/pngsuite/ftp0n3p08.png
+++ b/contrib/pngsuite/ftp0n3p08.png
--- a/contrib/pngsuite/ftp1n3p08.png
+++ b/contrib/pngsuite/ftp1n3p08.png
--- a/contrib/visupng/PngFile.c
+++ b/contrib/visupng/PngFile.c
@@ -1,19 +1,14 @@
-/*-------------------------------------
+//-------------------------------------
- *  PNGFILE.C -- Image File Functions
+//  PNGFILE.C -- Image File Functions
- *-------------------------------------
+//-------------------------------------
- *
+
- * Copyright 2000, Willem van Schaik.
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
- *
+// use, see the copyright/license/disclaimer notice in png.h
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 */
 #include <windows.h>
 #include <commdlg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <zlib.h>
 #include "png.h"
 #include "pngfile.h"
@@ -30,14 +25,14 @@ static png_structp png_ptr = NULL;
 static png_infop info_ptr = NULL;
-/* cexcept interface */
+// cexcept interface
 static void
 png_cexcept_error(png_structp png_ptr, png_const_charp msg)
 {
   if(png_ptr)
     ;
-#ifdef PNG_CONSOLE_IO_SUPPORTED
+#ifndef PNG_NO_CONSOLE_IO
   fprintf(stderr, "libpng error: %s\n", msg);
 #endif
   {
@@ -45,7 +40,7 @@ png_cexcept_error(png_structp png_ptr, png_const_charp msg)
   }
 }
-/* Windows open-file functions */
+// Windows open-file functions
 void PngFileInitialize (HWND hwnd)
 {
@@ -59,13 +54,13 @@ void PngFileInitialize (HWND hwnd)
    ofn.lpstrCustomFilter = NULL;
    ofn.nMaxCustFilter    = 0;
    ofn.nFilterIndex      = 0;
-    ofn.lpstrFile         = NULL;          /* Set in Open and Close functions */
+    ofn.lpstrFile         = NULL;          // Set in Open and Close functions
    ofn.nMaxFile          = MAX_PATH;
-    ofn.lpstrFileTitle    = NULL;          /* Set in Open and Close functions */
+    ofn.lpstrFileTitle    = NULL;          // Set in Open and Close functions
    ofn.nMaxFileTitle     = MAX_PATH;
    ofn.lpstrInitialDir   = NULL;
    ofn.lpstrTitle        = NULL;
-    ofn.Flags             = 0;             /* Set in Open and Close functions */
+    ofn.Flags             = 0;             // Set in Open and Close functions
    ofn.nFileOffset       = 0;
    ofn.nFileExtension    = 0;
    ofn.lpstrDefExt       = TEXT ("png");
@@ -94,7 +89,7 @@ BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
    return GetSaveFileName (&ofn);
 }
-/* PNG image handler functions */
+// PNG image handler functions
 BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor)
@@ -111,7 +106,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
    static png_byte   **ppbRowPointers = NULL;
    int                 i;
-    /* open the PNG input file */
+    // open the PNG input file
    if (!pstrFileName)
    {
@@ -125,16 +120,16 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        return FALSE;
    }
-    /* first check the eight byte PNG signature */
+    // first check the eight byte PNG signature
    fread(pbSig, 1, 8, pfFile);
-    if (png_sig_cmp(pbSig, 0, 8))
+    if (!png_check_sig(pbSig, 8))
    {
        *ppbImageData = pbImageData = NULL;
        return FALSE;
    }
-    /* create the two png(-info) structures */
+    // create the two png(-info) structures
    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
@@ -155,9 +150,9 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
    Try
    {
-        /* initialize the png structure */
+        // initialize the png structure
-#ifdef PNG_STDIO_SUPPORTED
+#if !defined(PNG_NO_STDIO)
        png_init_io(png_ptr, pfFile);
 #else
        png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data);
@@ -165,26 +160,20 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        png_set_sig_bytes(png_ptr, 8);
-        /* read all PNG info up to image data */
+        // read all PNG info up to image data
        png_read_info(png_ptr, info_ptr);
-        /* get width, height, bit-depth and color-type */
+        // get width, height, bit-depth and color-type
        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
            &iColorType, NULL, NULL, NULL);
-        /* expand images of all color-type and bit-depth to 3x8-bit RGB */
+        // expand images of all color-type and bit-depth to 3x8 bit RGB images
-        /* let the library process alpha, transparency, background, etc. */
+        // let the library process things like alpha, transparency, background
-#ifdef PNG_READ_16_TO_8_SUPPORTED
+        if (iBitDepth == 16)
-    if (iBitDepth == 16)
+            png_set_strip_16(png_ptr);
 #  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
        png_set_scale_16(png_ptr);
 #  else
        png_set_strip_16(png_ptr);
 #  endif
 #endif
        if (iColorType == PNG_COLOR_TYPE_PALETTE)
            png_set_expand(png_ptr);
        if (iBitDepth < 8)
@@ -195,7 +184,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
            iColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
            png_set_gray_to_rgb(png_ptr);
-        /* set the background color to draw transparent and alpha images over */
+        // set the background color to draw transparent and alpha images over.
        if (png_get_bKGD(png_ptr, info_ptr, &pBackground))
        {
            png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
@@ -208,28 +197,28 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
            pBkgColor = NULL;
        }
-        /* if required set gamma conversion */
+        // if required set gamma conversion
        if (png_get_gAMA(png_ptr, info_ptr, &dGamma))
            png_set_gamma(png_ptr, (double) 2.2, dGamma);
-        /* after the transformations are registered, update info_ptr data */
+        // after the transformations have been registered update info_ptr data
        png_read_update_info(png_ptr, info_ptr);
-        /* get again width, height and the new bit-depth and color-type */
+        // get again width, height and the new bit-depth and color-type
        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
            &iColorType, NULL, NULL, NULL);
-        /* row_bytes is the width x number of channels */
+        // row_bytes is the width x number of channels
        ulRowBytes = png_get_rowbytes(png_ptr, info_ptr);
        ulChannels = png_get_channels(png_ptr, info_ptr);
        *piChannels = ulChannels;
-        /* now we can allocate memory to store the image */
+        // now we can allocate memory to store the image
        if (pbImageData)
        {
@@ -243,7 +232,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        }
        *ppbImageData = pbImageData;
-        /* and allocate memory for an array of row-pointers */
+        // and allocate memory for an array of row-pointers
        if ((ppbRowPointers = (png_bytepp) malloc((*piHeight)
                            * sizeof(png_bytep))) == NULL)
@@ -251,25 +240,25 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
            png_error(png_ptr, "Visual PNG: out of memory");
        }
-        /* set the individual row-pointers to point at the correct offsets */
+        // set the individual row-pointers to point at the correct offsets
        for (i = 0; i < (*piHeight); i++)
            ppbRowPointers[i] = pbImageData + i * ulRowBytes;
-        /* now we can go ahead and just read the whole image */
+        // now we can go ahead and just read the whole image
        png_read_image(png_ptr, ppbRowPointers);
-        /* read the additional chunks in the PNG file (not really needed) */
+        // read the additional chunks in the PNG file (not really needed)
        png_read_end(png_ptr, NULL);
-        /* and we're done */
+        // and we're done
        free (ppbRowPointers);
        ppbRowPointers = NULL;
-        /* yepp, done */
+        // yepp, done
    }
    Catch (msg)
@@ -303,7 +292,7 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    static png_byte   **ppbRowPointers = NULL;
    int                 i;
-    /* open the PNG output file */
+    // open the PNG output file
    if (!pstrFileName)
        return FALSE;
@@ -311,7 +300,7 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    if (!(pfFile = fopen(pstrFileName, "wb")))
        return FALSE;
-    /* prepare the standard PNG structures */
+    // prepare the standard PNG structures
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
@@ -330,60 +319,60 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    Try
    {
-        /* initialize the png structure */
+        // initialize the png structure
-#ifdef PNG_STDIO_SUPPORTED
+#if !defined(PNG_NO_STDIO)
        png_init_io(png_ptr, pfFile);
 #else
        png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush);
 #endif
-        /* we're going to write a very simple 3x8-bit RGB image */
+        // we're going to write a very simple 3x8 bit RGB image
        png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth,
            PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
            PNG_FILTER_TYPE_BASE);
-        /* write the file header information */
+        // write the file header information
        png_write_info(png_ptr, info_ptr);
-        /* swap the BGR pixels in the DiData structure to RGB */
+        // swap the BGR pixels in the DiData structure to RGB
        png_set_bgr(png_ptr);
-        /* row_bytes is the width x number of channels */
+        // row_bytes is the width x number of channels
        ulRowBytes = iWidth * ciChannels;
-        /* we can allocate memory for an array of row-pointers */
+        // we can allocate memory for an array of row-pointers
        if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL)
            Throw "Visualpng: Out of memory";
-        /* set the individual row-pointers to point at the correct offsets */
+        // set the individual row-pointers to point at the correct offsets
        for (i = 0; i < iHeight; i++)
            ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2);
-        /* write out the entire image data in one call */
+        // write out the entire image data in one call
        png_write_image (png_ptr, ppbRowPointers);
-        /* write the additional chunks to the PNG file (not really needed) */
+        // write the additional chunks to the PNG file (not really needed)
        png_write_end(png_ptr, info_ptr);
-        /* and we're done */
+        // and we're done
        free (ppbRowPointers);
        ppbRowPointers = NULL;
-        /* clean up after the write, and free any memory allocated */
+        // clean up after the write, and free any memory allocated
        png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
-        /* yepp, done */
+        // yepp, done
    }
    Catch (msg)
@@ -403,7 +392,7 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    return TRUE;
 }
-#ifndef PNG_STDIO_SUPPORTED
+#ifdef PNG_NO_STDIO
 static void
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -445,7 +434,6 @@ png_flush(png_structp png_ptr)
 #endif
-/*-----------------
+//-----------------
- *  end of source
+//  end of source
- *-----------------
+//-----------------
 */
--- a/contrib/visupng/PngFile.h
+++ b/contrib/visupng/PngFile.h
@@ -1,12 +1,9 @@
-/*------------------------------------------*/
+//------------------------------------------
-/*  PNGFILE.H -- Header File for pngfile.c*/
+//  PNGFILE.H -- Header File for pngfile.c
-/*------------------------------------------*/
+//------------------------------------------
-/* Copyright 2000, Willem van Schaik.*/
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
-
+// use, see the copyright/license/disclaimer notice in png.h
 /* This code is released under the libpng license.*/
 /* For conditions of distribution and use, see the disclaimer*/
 /* and license in png.h*/
 #include <stdio.h>
 #include <stdlib.h>
@@ -22,7 +19,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
 BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
                   int iWidth, int iHeight, png_color BkgColor);
-#ifndef PNG_STDIO_SUPPORTED
+#if defined(PNG_NO_STDIO)
 static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
 static void png_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
 static void png_flush(png_structp png_ptr);
--- a/contrib/visupng/README.txt
+++ b/contrib/visupng/README.txt
@@ -1,11 +1,8 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for VisualPng
 ------------------------------------------------------------------------
-Copyright 2000, Willem van Schaik.
+Copyright 2000, Willem van Schaik.  For conditions of distribution and
-
+use, see the copyright/license/disclaimer notice in png.h
 This code is released under the libpng license.
 For conditions of distribution and use, see the disclaimer
 and license in png.h
 As a PNG .dll demo VisualPng is finished. More features would only hinder
 the program's objective. However, further extensions (like support for other 
--- a/Show More
+++ b/Show More