Imported from libpng-1.0.9beta7.tar

Imported from libpng-1.0.9rc1.tar
Imported from libpng-1.0.9beta6.tar
2025-07-10 18:04:09 +02:00 · 2009-04-06 16:05:49 -05:00 · 2009-04-06 16:05:47 -05:00 · 2009-04-06 16:05:45 -05:00 · 2009-04-06 16:05:43 -05:00 · 2009-04-06 16:05:41 -05:00
62 changed files with 859 additions and 362 deletions
--- a/19
+++ b/19
@@ -1,5 +1,5 @@

-Libpng 1.0.9beta2 - November 19, 2000
+Libpng 1.0.9beta7 - December 28, 2000

 This is a public release of libpng, intended for use in production codes.

@@ -28,6 +28,23 @@ Changes since the last public release (1.0.8):
    subdirectory and added projects/borland project subdirectory.
  Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
  Add error message in png_set_compression_buffer_size() when malloc fails.
+  Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+  Removed the png_flush() in pngwrite.c that crashes some applications
+    that don't set png_output_flush_fn.
+  Added makefile.macosx and makefile.aix to scripts directory.
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+  Added support for filter method 64 (for PNG datastreams embedded in MNG)
+  Revised png_set_filter() to accept filter method 64 when appropriate.
+  Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+    help prevent applications from using MNG features in PNG datastreams.
+  Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
+  Fixed error handling of unknown compression type in png_decompress_chunk().
+  In pngconf.h, define __cdecl when _MSC_VER is defined.
+  Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+  Revised memory management in png_set_hIST and png_handle_hIST in a backward
+    compatible manner.  PLTE and tRNS were revised similarly.
+  Revised the iCCP chunk reader to ignore trailing garbage.

 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
--- a/29
+++ b/29
@@ -379,7 +379,7 @@ version 1.0.2a [December 30, 1998]
  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
  Removed lines after Dynamic Dependencies" in makefile.aco .
  Revised makefile.dec to make a shared library (Jeremie Petit).
-  Removed trailing blanks from all files. 
+  Removed trailing blanks from all files.
 version 1.0.2a [January 6, 1999]
  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
@@ -718,7 +718,7 @@ version 1.0.6i [May 2, 2000]
    the high-level interface, and unknown chunks support (all new in 1.0.6).
    This was necessary because of old applications that allocate the structs
    directly as authors were instructed to do in libpng-0.88 and earlier,
-    instead of using png_create_*(). 
+    instead of using png_create_*().
  Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
    can be used to detect codes that directly allocate the structs, and
    code to check these modes in png_read_init() and png_write_init() and
@@ -798,7 +798,6 @@ version 1.0.7rc2 [June 28, 2000]
  Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
 version 1.0.7 [July 1, 2000]
  Revised the definition of "trans_values" in libpng.3/libpng.txt
-version 1.0.9beta2 [November 19, 2000]
 version 1.0.8beta1 [July 8, 2000]
  Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
  Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
@@ -848,6 +847,30 @@ version 1.0.9beta2 [November 19, 2000]
  Added borland project files to "projects" subdirectory.
  Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
  Add error message in png_set_compression_buffer_size() when malloc fails.
+version 1.0.9beta3 [November 23, 2000]
+  Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+  Removed the png_flush() in pngwrite.c that crashes some applications
+    that don't set png_output_flush_fn.
+  Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+version 1.0.9beta5 [December 15, 2000]
+  Added support for filter method 64 (for PNG datastreams embedded in MNG)
+version 1.0.9beta6 [December 18, 2000]
+  Revised png_set_filter() to accept filter method 64 when appropriate.
+  Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+    help prevent applications from using MNG features in PNG datastreams.
+  Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
+version 1.0.9rc1 [December 23, 2000]
+  Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
+  Fixed error handling of unknown compression type in png_decompress_chunk().
+  In pngconf.h, define __cdecl when _MSC_VER is defined.
+version 1.0.9beta7 [December 28, 2000]
+  Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+  Revised memory management in png_set_hIST and png_handle_hIST in a backward
+    compatible manner.  PLTE and tRNS were revised similarly.
+  Revised the iCCP chunk reader to ignore trailing garbage.

 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
--- a/16
+++ b/16
@@ -1,5 +1,5 @@

-Installing libpng version 1.0.9beta2 - November 19, 2000
+Installing libpng version 1.0.9beta7 - December 28, 2000

 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,7 +10,7 @@ zlib.h and zconf.h include files that correspond to the
 version of zlib that's installed.

 You can rename the directories that you downloaded (they
-might be called "libpng-1.0.9beta2" or "lpng109" and "zlib-1.1.3"
+might be called "libpng-1.0.9beta7" or "lpng109" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".

 Your directory structure should look like this:
@@ -53,29 +53,31 @@ instructions in the README* files.

 Else enter the zlib directory and follow the instructions in zlib/README,
 then come back here and choose the appropriate makefile.sys in the scripts
-directory.  
+directory.

 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 libpng.so.2.1.0.9beta2)
- makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta2,
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta7)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta7,
                       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.dec      =>  DEC Alpha UNIX makefile
 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.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
- makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta2)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta7)
 makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.9beta2)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.9beta7)
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.mips     =>  MIPS makefile
 makefile.acorn    =>  Acorn makefile
--- a/65
+++ b/65
@@ -1,65 +1,4 @@

-Known bugs and suggested enhancements in libpng-1.0.8
-
-0: November 3, 2000 -- BUG -- incorrect iCCP chunk is written
-
-   The compression_type byte in the iCCP chunk written by libpng is
-   usually incorrect.
-
-   Status: Fixed in libpng-1.0.9beta1
-
-1. October 12, 2000 -- BUG -- pngtest fails
-
-   The three WRITEFILE calls in pngtest.c are incorrect.  They must be
-   changed to read
-
-   WRITEFILE((png_FILE_p)png_ptr->io_ptr,  data, length, check);
-   WRITEFILE(io_ptr, near_data, length, check);
-   WRITEFILE(io_ptr, buf, written, err);
-
-2. August 28, 2000 -- BUG -- pnggccrd.c
-
-   The interlacing() function has still not been fully converted and
-   will not compile under gcc-2.95.2; it is currently ifdef'ed out.
-
-   STATUS: Fixed in libpng-1.0.9.  There were also bugs in pngvcrd.c
-   which have been fixed.  The replacement files are available at the
-   PNG web site (http://www.libpng.org/pub/png).
-
-3. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
-
-   Loops need to be optimized everywhere
-
-   Make them count down instead of up -- Kevin Bracey
-
-   Optimizing compilers don't need this, and making
-   the change would be error prone -- Tom Lane, Glenn R-P
-
-   Question whether i-- or --i is better.
-
-   STATUS: Under investigation, postponed until after
-   libpng-2.0.0.  About 160 loops will be turned around
-   in libpng-2.0.x betaxx, for testing.
-
-4. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
-
-   libpng-1.0.5 and earlier transform colors to gamma=1.0 space for
-   merging with background, and then back to the image's gamma.  The
-   bit_depth of the intermediate (gamma=1.0) representation is probably
-   not sufficient.  In the typical gamma=1/2.2 situation, the linear
-   pixels need about 4 more bits than the gamma-encoded ones, to avoid
-   loss of precision.  A similar situation exists with the rgb_to_gray
-   operation.
-
-   STATUS: under development.
-
-5. September 1999 -- ENHANCEMENT --
-
-   It should be possible to use libpng without floating-point arithmetic.
-
-   STATUS: Under investigation, implementation postponed until after
-   libpng-2.0.0.
-
-   Much of this was completed in libpng-1.0.6, but gamma compensation
-   is not yet done in fixed-point arithmetic.
+Known bugs in libpng-1.0.9

+None as of December 28, 2000.
--- a/4
+++ b/4
@@ -8,7 +8,7 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.0.7, July 1, 2000, through 1.0.9beta2, November 19, 2000, are
+libpng versions 1.0.7, July 1, 2000, through 1.0.9beta7, December 28, 2000, are
 Copyright (c) 2000 Glenn Randers-Pehrson
 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
@@ -99,4 +99,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 19, 2000
+December 28, 2000
--- a/12
+++ b/12
@@ -1,4 +1,4 @@
-README for libpng 1.0.9beta2 - November 19, 2000 (shared library 2.1)
+README for libpng 1.0.9beta7 - December 28, 2000 (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.
@@ -182,25 +182,27 @@ Files in this distribution:
       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 libpng.so.2.1.0.9beta2)
+                            (gcc, creates libpng.so.2.1.0.9beta7)
       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng.so.2.1.0.9beta2, uses assembler code
+                            libpng.so.2.1.0.9beta7, 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.dec     =>  DEC Alpha UNIX makefile
       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.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta2)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta7)
       makefile.sunos   =>  Sun makefile
       makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.9beta2)
+                            (gcc, creates libpng.so.2.1.0.9beta7)
       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
       makefile.mips    =>  MIPS makefile
       makefile.acorn   =>  Acorn makefile
--- a/5
+++ b/5
@@ -17,3 +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).
+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.
--- a/4
+++ b/4
@@ -1,13 +1,13 @@
   Y2K compliance in libpng:
   =========================

-      November 19, 2000
+      December 28, 2000

      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 1.0.9beta2 are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.9beta7 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
--- a/2
+++ b/2
@@ -1,5 +1,5 @@
 echo "
-  There is no \"configure\" script for Libpng-1.0.9beta2.  Instead, please
+  There is no \"configure\" script for Libpng-1.0.9beta7.  Instead, please
  copy the appropriate makefile for your system from the \"scripts\"
  directory.  Read the INSTALL file for more details.
 "
--- a/example.c
+++ b/example.c
@@ -267,7 +267,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    */
   if (color_type & PNG_COLOR_MASK_COLOR)
   {
-      png_uint_32 num_palette;
+      int num_palette;
      png_colorp palette;

      /* This reduces the image to the application supplied palette */
@@ -603,9 +603,9 @@ void write_png(char *file_name /* , ... other image information ... */)
      PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

   /* set the palette if there is one.  REQUIRED for indexed-color images */
-   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof (png_color));
   /* ... set palette colors ... */
-   png_set_PLTE(png_ptr, info_ptr, palette, 256);
+   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
   /* You must not free palette here, because png_set_PLTE only makes a link to
      the palette that you malloced.  Wait until you are about to destroy
      the png structure. */
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "November 19, 2000"
+.TH LIBPNG 3 "December 28, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta2
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta7
 .SH SYNOPSIS
 \fI\fB

@@ -747,7 +747,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.0.9beta2 - November 19, 2000
+ libpng version 1.0.9beta7 - December 28, 2000
 Updated and distributed by Glenn Randers-Pehrson
 <randeg@alum.rpi.edu>
 Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -814,7 +814,7 @@ majority of the needs of its users.

 Libpng uses zlib for its compression and decompression of PNG files.
 Further information about zlib, and the latest version of zlib, can
-be found at the zlib home page, <ftp://ftp.freesoftware.com/pub/infozip/zlib/>.
+be found at the zlib home page, <http://www.info-zip.org/pub/infozip/zlib/>.
 The zlib compression utility is a general purpose utility that is
 useful for more than PNG files, and can be used without libpng.
 See the documentation delivered with zlib for more details.
@@ -1118,7 +1118,7 @@ row_pointers prior to calling png_read_png() with
   row_pointers = png_malloc(png_ptr, height*sizeof(png_bytep));
   for (int i=0; i<height, i++)
      row_pointers[i]=png_malloc(png_ptr, width*pixel_size);
-   png_set_rows(png_ptr, info_ptr, &row_pointers); 
+   png_set_rows(png_ptr, info_ptr, &row_pointers);

 Alternatively you could allocate your image in one big block and define
 row_pointers[i] to point into the proper places in your block.
@@ -1147,7 +1147,7 @@ in until png_read_end() has read the chunk data following the image.

    png_get_IHDR(png_ptr, info_ptr, &width, &height,
       &bit_depth, &color_type, &interlace_type,
-       &compression_type, &filter_type);
+       &compression_type, &filter_method);

    width          - holds the width of the image
                     in pixels (up to 2^31).
@@ -1175,15 +1175,18 @@ in until png_read_end() has read the chunk data following the image.
                     PNG_COLOR_MASK_COLOR
                     PNG_COLOR_MASK_ALPHA

-    filter_type    - (must be PNG_FILTER_TYPE_BASE
-                     for PNG 1.0)
+    filter_method  - (must be PNG_FILTER_TYPE_BASE
+                     for PNG 1.0, and can also be
+                     PNG_INTRAPIXEL_DIFFERENCING if
+                     the PNG datastream is embedded in
+                     a MNG-1.0 datastream)
    compression_type - (must be PNG_COMPRESSION_TYPE_BASE
                     for PNG 1.0)
    interlace_type - (PNG_INTERLACE_NONE or
                     PNG_INTERLACE_ADAM7)
    Any or all of interlace_type, compression_type, of
-                     filter_type can be NULL if you are not
-                     interested in their values.
+                     filter_method can be NULL if you are
+                     not interested in their values.

    channels = png_get_channels(png_ptr, info_ptr);
    channels       - number of channels of info for the
@@ -1213,7 +1216,7 @@ in until png_read_end() has read the chunk data following the image.
                         info_ptr);
    color_type       = png_get_color_type(png_ptr,
                         info_ptr);
-    filter_type      = png_get_filter_type(png_ptr,
+    filter_method    = png_get_filter_type(png_ptr,
                         info_ptr);
    compression_type = png_get_compression_type(png_ptr,
                         info_ptr);
@@ -1311,7 +1314,7 @@ into the info_ptr is returned for any complex types.
                         (empty string for unknown).
    num_text       - number of comments (same as num_comments;
                     you can put NULL here to avoid the duplication)
-    Note while png_set_text() will accept text, language, and 
+    Note while png_set_text() will accept text, language, and
    translated keywords that can be NULL pointers, the structure
    returned by png_get_text will always contain regular
    zero-terminated C strings.  They might be empty strings but
@@ -1706,7 +1709,7 @@ histogram, it may not do as good a job.
      if (png_get_valid(png_ptr, info_ptr,
         PNG_INFO_PLTE))
      {
-         png_color_16p histogram;
+         png_uint_16p histogram;

         png_get_hIST(png_ptr, info_ptr,
            &histogram);
@@ -1994,7 +1997,7 @@ application instead of by libpng, you can use
    png_set_invalid(png_ptr, info_ptr, mask);
    mask - identifies the chunks to be made invalid,
           containing the logical OR of one or
-           more of 
+           more of
             PNG_INFO_gAMA, PNG_INFO_sBIT,
             PNG_INFO_cHRM, PNG_INFO_PLTE,
             PNG_INFO_tRNS, PNG_INFO_bKGD,
@@ -2286,10 +2289,11 @@ maximum possible compression at the expense of slower writing.  If you
 have no special needs in this area, let the library do what it wants by
 not calling this function at all, as it has been tuned to deliver a good
 speed/compression ratio. The second parameter to png_set_filter() is
-the filter method, for which the only valid value is '0' (as of the
-July 1999 PNG specification, version 1.2).  The third parameter is a
-flag that indicates which filter type(s) are to be tested for each
-scanline.  See the PNG specification for details on the specific filter
+the filter method, for which the only valid values are 0 (as of the
+July 1999 PNG specification, version 1.2) or 64 (if you are writing
+a PNG datastream that is to be embedded in a MNG datastream).  The third
+parameter is a flag that indicates which filter type(s) are to be tested
+for each scanline.  See the PNG specification for details on the specific filter
 types.


@@ -2310,6 +2314,9 @@ it should start out with all of the filters (to ensure that the previous
 row of pixels will be stored in case it's needed later), and then add
 and remove them after the start of compression.

+If you are writing a PNG datastream that is to be embedded in a MNG
+datastream, the second parameter can be either 0 or 64.
+
 The png_set_compression_*() functions interface to the zlib compression
 library, and should mostly be ignored unless you really know what you are
 doing.  The only generally useful call is png_set_compression_level()
@@ -2348,7 +2355,7 @@ Some of the more important parts of the png_info are:

    png_set_IHDR(png_ptr, info_ptr, width, height,
       bit_depth, color_type, interlace_type,
-       compression_type, filter_type)
+       compression_type, filter_method)
    width          - holds the width of the image
                     in pixels (up to 2^31).
    height         - holds the height of the image
@@ -2380,7 +2387,11 @@ Some of the more important parts of the png_info are:
                     PNG_INTERLACE_ADAM7
    compression_type - (must be
                     PNG_COMPRESSION_TYPE_DEFAULT)
-    filter_type    - (must be PNG_FILTER_TYPE_DEFAULT)
+    filter_method  - (must be PNG_FILTER_TYPE_DEFAULT
+                     or, if you are writing a PNG to
+                     be embedded in a MNG datastream,
+                     can also be
+                     PNG_INTRAPIXEL_DIFFERENCING)

    png_set_PLTE(png_ptr, info_ptr, palette,
       num_palette);
@@ -3217,6 +3228,10 @@ structures appropriately for all of the filter types.

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
       filters);
+              The second parameter can also be PNG_INTRAPIXEL_DIFFERENCING
+              if you are writing a PNG to be embedded in a MNG
+              datastream.  This parameter must be the same as the
+              value of filter_method used in png_set_IHDR().

 It is also possible to influence how libpng chooses from among the
 available filters.  This is done in two ways - by telling it how
@@ -3328,7 +3343,32 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
 having level = 0 will be printed.  There aren't any such statements in
 this version of libpng, but if you insert some they will be printed.

-.SH VI.  Changes to Libpng from version 0.88
+.SH VI.  MNG support
+
+The MNG specification (available at http://www.libpng.org/pub/mng) allows
+certain extensions to PNG for PNG images that are embedded in MNG datastreams.
+Libpng can support some of these extensions.  To enable them, use the
+png_permit_mng_features() function:
+
+   feature_set = png_permit_mng_features(png_ptr, mask)
+   mask is a png_uint_32 containing the logical OR of the
+        features you want to enable.  These include
+        PNG_FLAG_MNG_EMPTY_PLTE
+        PNG_FLAG_MNG_FILTER_64
+        PNG_ALL_MNG_FEATURES
+   feature_set is a png_32_uint that is the logical AND of
+      your mask with the set of MNG features that is
+      supported by the version of libpng that you are using.
+
+It is an error to use this function when reading or writing a standalone
+PNG file with the PNG 8-byte signature.  The PNG datastream must be wrapped
+in a MNG datastream.  As a minimum, it must have the MNG 8-byte signature
+and the MHDR and MEND chunks.  Libpng does not provide support for these
+or any other MNG chunks; your application must provide its own support for
+them.  You may wish to consider using libmng (available at
+http://www.libmng.com) instead.
+
+.SH VII.  Changes to Libpng from version 0.88

 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -3377,15 +3417,15 @@ application:

   png_uint_32 application_vn = PNG_LIBPNG_VER;

-.SH VII. Y2K Compliance in libpng
+.SH VIII. Y2K Compliance in libpng

-November 19, 2000
+December 28, 2000

 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 1.0.9beta2 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.9beta7 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
@@ -3526,7 +3566,7 @@ possible without all of you.

 Thanks to Frank J. T. Wojcik for helping with the documentation.

-Libpng version 1.0.9beta2 - November 19, 2000:
+Libpng version 1.0.9beta7 - December 28, 2000:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).

@@ -3543,7 +3583,7 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.0.7, July 1, 2000, through  1.0.9beta2, November 19, 2000, are
+libpng versions 1.0.7, July 1, 2000, through  1.0.9beta7, December 28, 2000, are
 Copyright (c) 2000 Glenn Randers-Pehrson, 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
@@ -3634,7 +3674,7 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 19, 2000
+December 28, 2000

 .\" end of man page

--- a/libpng.txt
+++ b/libpng.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.0.9beta2 - November 19, 2000
+ libpng version 1.0.9beta7 - December 28, 2000
 Updated and distributed by Glenn Randers-Pehrson
 <randeg@alum.rpi.edu>
 Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -67,7 +67,7 @@ majority of the needs of its users.

 Libpng uses zlib for its compression and decompression of PNG files.
 Further information about zlib, and the latest version of zlib, can
-be found at the zlib home page, <ftp://ftp.freesoftware.com/pub/infozip/zlib/>.
+be found at the zlib home page, <http://www.info-zip.org/pub/infozip/zlib/>.
 The zlib compression utility is a general purpose utility that is
 useful for more than PNG files, and can be used without libpng.
 See the documentation delivered with zlib for more details.
@@ -371,7 +371,7 @@ row_pointers prior to calling png_read_png() with
   row_pointers = png_malloc(png_ptr, height*sizeof(png_bytep));
   for (int i=0; i<height, i++)
      row_pointers[i]=png_malloc(png_ptr, width*pixel_size);
-   png_set_rows(png_ptr, info_ptr, &row_pointers); 
+   png_set_rows(png_ptr, info_ptr, &row_pointers);

 Alternatively you could allocate your image in one big block and define
 row_pointers[i] to point into the proper places in your block.
@@ -400,7 +400,7 @@ in until png_read_end() has read the chunk data following the image.

    png_get_IHDR(png_ptr, info_ptr, &width, &height,
       &bit_depth, &color_type, &interlace_type,
-       &compression_type, &filter_type);
+       &compression_type, &filter_method);

    width          - holds the width of the image
                     in pixels (up to 2^31).
@@ -428,15 +428,18 @@ in until png_read_end() has read the chunk data following the image.
                     PNG_COLOR_MASK_COLOR
                     PNG_COLOR_MASK_ALPHA

-    filter_type    - (must be PNG_FILTER_TYPE_BASE
-                     for PNG 1.0)
+    filter_method  - (must be PNG_FILTER_TYPE_BASE
+                     for PNG 1.0, and can also be
+                     PNG_INTRAPIXEL_DIFFERENCING if
+                     the PNG datastream is embedded in
+                     a MNG-1.0 datastream)
    compression_type - (must be PNG_COMPRESSION_TYPE_BASE
                     for PNG 1.0)
    interlace_type - (PNG_INTERLACE_NONE or
                     PNG_INTERLACE_ADAM7)
    Any or all of interlace_type, compression_type, of
-                     filter_type can be NULL if you are not
-                     interested in their values.
+                     filter_method can be NULL if you are
+                     not interested in their values.

    channels = png_get_channels(png_ptr, info_ptr);
    channels       - number of channels of info for the
@@ -466,7 +469,7 @@ in until png_read_end() has read the chunk data following the image.
                         info_ptr);
    color_type       = png_get_color_type(png_ptr,
                         info_ptr);
-    filter_type      = png_get_filter_type(png_ptr,
+    filter_method    = png_get_filter_type(png_ptr,
                         info_ptr);
    compression_type = png_get_compression_type(png_ptr,
                         info_ptr);
@@ -564,7 +567,7 @@ into the info_ptr is returned for any complex types.
                         (empty string for unknown).
    num_text       - number of comments (same as num_comments;
                     you can put NULL here to avoid the duplication)
-    Note while png_set_text() will accept text, language, and 
+    Note while png_set_text() will accept text, language, and
    translated keywords that can be NULL pointers, the structure
    returned by png_get_text will always contain regular
    zero-terminated C strings.  They might be empty strings but
@@ -959,7 +962,7 @@ histogram, it may not do as good a job.
      if (png_get_valid(png_ptr, info_ptr,
         PNG_INFO_PLTE))
      {
-         png_color_16p histogram;
+         png_uint_16p histogram;

         png_get_hIST(png_ptr, info_ptr,
            &histogram);
@@ -1247,7 +1250,7 @@ application instead of by libpng, you can use
    png_set_invalid(png_ptr, info_ptr, mask);
    mask - identifies the chunks to be made invalid,
           containing the logical OR of one or
-           more of 
+           more of
             PNG_INFO_gAMA, PNG_INFO_sBIT,
             PNG_INFO_cHRM, PNG_INFO_PLTE,
             PNG_INFO_tRNS, PNG_INFO_bKGD,
@@ -1539,10 +1542,11 @@ maximum possible compression at the expense of slower writing.  If you
 have no special needs in this area, let the library do what it wants by
 not calling this function at all, as it has been tuned to deliver a good
 speed/compression ratio. The second parameter to png_set_filter() is
-the filter method, for which the only valid value is '0' (as of the
-July 1999 PNG specification, version 1.2).  The third parameter is a
-flag that indicates which filter type(s) are to be tested for each
-scanline.  See the PNG specification for details on the specific filter
+the filter method, for which the only valid values are 0 (as of the
+July 1999 PNG specification, version 1.2) or 64 (if you are writing
+a PNG datastream that is to be embedded in a MNG datastream).  The third
+parameter is a flag that indicates which filter type(s) are to be tested
+for each scanline.  See the PNG specification for details on the specific filter
 types.


@@ -1563,6 +1567,9 @@ it should start out with all of the filters (to ensure that the previous
 row of pixels will be stored in case it's needed later), and then add
 and remove them after the start of compression.

+If you are writing a PNG datastream that is to be embedded in a MNG
+datastream, the second parameter can be either 0 or 64.
+
 The png_set_compression_*() functions interface to the zlib compression
 library, and should mostly be ignored unless you really know what you are
 doing.  The only generally useful call is png_set_compression_level()
@@ -1601,7 +1608,7 @@ Some of the more important parts of the png_info are:

    png_set_IHDR(png_ptr, info_ptr, width, height,
       bit_depth, color_type, interlace_type,
-       compression_type, filter_type)
+       compression_type, filter_method)
    width          - holds the width of the image
                     in pixels (up to 2^31).
    height         - holds the height of the image
@@ -1633,7 +1640,11 @@ Some of the more important parts of the png_info are:
                     PNG_INTERLACE_ADAM7
    compression_type - (must be
                     PNG_COMPRESSION_TYPE_DEFAULT)
-    filter_type    - (must be PNG_FILTER_TYPE_DEFAULT)
+    filter_method  - (must be PNG_FILTER_TYPE_DEFAULT
+                     or, if you are writing a PNG to
+                     be embedded in a MNG datastream,
+                     can also be
+                     PNG_INTRAPIXEL_DIFFERENCING)

    png_set_PLTE(png_ptr, info_ptr, palette,
       num_palette);
@@ -2470,6 +2481,10 @@ structures appropriately for all of the filter types.

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
       filters);
+              The second parameter can also be PNG_INTRAPIXEL_DIFFERENCING
+              if you are writing a PNG to be embedded in a MNG
+              datastream.  This parameter must be the same as the
+              value of filter_method used in png_set_IHDR().

 It is also possible to influence how libpng chooses from among the
 available filters.  This is done in two ways - by telling it how
@@ -2581,7 +2596,32 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
 having level = 0 will be printed.  There aren't any such statements in
 this version of libpng, but if you insert some they will be printed.

-VI.  Changes to Libpng from version 0.88
+VI.  MNG support
+
+The MNG specification (available at http://www.libpng.org/pub/mng) allows
+certain extensions to PNG for PNG images that are embedded in MNG datastreams.
+Libpng can support some of these extensions.  To enable them, use the
+png_permit_mng_features() function:
+
+   feature_set = png_permit_mng_features(png_ptr, mask)
+   mask is a png_uint_32 containing the logical OR of the
+        features you want to enable.  These include
+        PNG_FLAG_MNG_EMPTY_PLTE
+        PNG_FLAG_MNG_FILTER_64
+        PNG_ALL_MNG_FEATURES
+   feature_set is a png_32_uint that is the logical AND of
+      your mask with the set of MNG features that is
+      supported by the version of libpng that you are using.
+
+It is an error to use this function when reading or writing a standalone
+PNG file with the PNG 8-byte signature.  The PNG datastream must be wrapped
+in a MNG datastream.  As a minimum, it must have the MNG 8-byte signature
+and the MHDR and MEND chunks.  Libpng does not provide support for these
+or any other MNG chunks; your application must provide its own support for
+them.  You may wish to consider using libmng (available at
+http://www.libmng.com) instead.
+
+VII.  Changes to Libpng from version 0.88

 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -2630,15 +2670,15 @@ application:

   png_uint_32 application_vn = PNG_LIBPNG_VER;

-VII. Y2K Compliance in libpng
+VIII. Y2K Compliance in libpng

-November 19, 2000
+December 28, 2000

 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 1.0.9beta2 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.9beta7 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
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "November 19, 2000"
+.TH LIBPNGPF 3 "December 28, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta2
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta7
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "November 19, 2000"
+.TH PNG 5 "December 28, 2000"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
--- a/png.c
+++ b/png.c
@@ -1,7 +1,7 @@

 /* png.c - location for general purpose libpng functions
 *
- * libpng version 1.0.9beta2 - November 19, 2000
+ * libpng version 1.0.9beta7 - December 28, 2000
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -13,14 +13,14 @@
 #include "png.h"

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_9beta2 Your_png_h_is_not_version_1_0_9beta2;
+typedef version_1_0_9beta7 Your_png_h_is_not_version_1_0_9beta7;

 /* Version information for C files.  This had better match the version
 * string defined in png.h.  */

 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = "1.0.9beta2";
+const char png_libpng_ver[18] = "1.0.9beta7";

 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -526,7 +526,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
   png_debug(1, "in png_info_destroy\n");

   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-    
+
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
   if (png_ptr->num_chunk_list)
   {
@@ -626,7 +626,7 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
   if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ((png_charp) "\n libpng version 1.0.9beta2 - November 19, 2000\n\
+   return ((png_charp) "\n libpng version 1.0.9beta7 - December 28, 2000\n\
   Copyright (c) 1998-2000 Glenn Randers-Pehrson\n\
   Copyright (c) 1996, 1997 Andreas Dilger\n\
   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
@@ -644,8 +644,8 @@ png_get_libpng_ver(png_structp png_ptr)
 {
   /* Version of *.c files used when building libpng */
   if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return((png_charp) "1.0.9beta2");
-   return((png_charp) "1.0.9beta2");
+      return((png_charp) "1.0.9beta7");
+   return((png_charp) "1.0.9beta7");
 }

 png_charp PNGAPI
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@

 /* png.h - header file for PNG reference library
 *
- * libpng version 1.0.9beta2 - November 19, 2000
+ * libpng version 1.0.9beta7 - December 28, 2000
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -9,7 +9,7 @@
 * Authors and maintainers:
 *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
 *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.0.9beta2 - November 19, 2000: Glenn
+ *  libpng versions 0.97, January 1998, through 1.0.9beta7 - December 28, 2000: Glenn
 *  See also "Contributing Authors", below.
 *
 * Note about libpng version numbers:
@@ -58,7 +58,9 @@
 *    1.0.8beta1-4                  10008  2.1.0.8beta1-4
 *    1.0.8rc1                      10008  2.1.0.8rc1
 *    1.0.8                         10008  2.1.0.8
- *    1.0.9beta1-2                  10009  2.1.0.9
+ *    1.0.9beta1-6                  10009  2.1.0.9beta1-6
+ *    1.0.9rc1                      10009  2.1.0.9rc1
+ *    1.0.9beta7                    10009  2.1.0.9beta7
 *
 *    Henceforth the source version will match the shared-library major
 *    and minor numbers; the shared-library major version number will be
@@ -85,7 +87,7 @@
 * If you modify libpng you may insert additional notices immediately following
 * this sentence.
 *
- * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta2, November 19, 2000, are
+ * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta7, December 28, 2000, are
 * Copyright (c) 2000 Glenn Randers-Pehrson, 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
@@ -190,13 +192,13 @@
 * Y2K compliance in libpng:
 * =========================
 *
- *    November 19, 2000
+ *    December 28, 2000
 *
 *    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 1.0.9beta2 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.9beta7 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
@@ -252,7 +254,7 @@
 */

 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.9beta2"
+#define PNG_LIBPNG_VER_STRING "1.0.9beta7"

 #define PNG_LIBPNG_VER_SONUM   2

@@ -262,8 +264,16 @@
 #define PNG_LIBPNG_VER_RELEASE 9
 /* This should match the numeric part of the final component of
 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
-#define PNG_LIBPNG_VER_BUILD  2
-#define PNG_LIBPNG_BUILD_TYPE beta /* alpha, beta, rc, stable, patched */
+
+#define PNG_LIBPNG_VER_BUILD  7
+
+#define PNG_LIBPNG_BUILD_ALPHA    1
+#define PNG_LIBPNG_BUILD_BETA     2
+#define PNG_LIBPNG_BUILD_RC       3
+#define PNG_LIBPNG_BUILD_STABLE   4
+#define PNG_LIBPNG_BUILD_TYPEMASK 7
+#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with STABLE only */
+#define PNG_LIBPNG_BUILD_TYPE 2

 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
 * We must not include leading zeros.
@@ -496,20 +506,20 @@ typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 * The following members may have allocated storage attached that should be
 * cleaned up before the structure is discarded: palette, trans, text,
 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
- * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these are
- * automatically freed when the info structure is deallocated, if they were
+ * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
+ * are automatically freed when the info structure is deallocated, if they were
 * allocated internally by libpng.  This behavior can be changed by means
 * of the png_data_freer() function.
 *
- * More allocation details: all the chunk-reading functions that change these
- * members go through the corresponding png_set_* functions.  A function to
- * clear these members is available: see png_free_data().   Some of the
- * png_set_* functions do not depend on being able to point info structure
- * members to any of the storage they are passed (they make their own copies),
- * EXCEPT that the png_set_text functions use the same storage passed to them
- * in the text_ptr or itxt_ptr structure argument, and the png_set_tRNS,
- * png_set_PLTE, png_set_hIST, png_set_iCCP, png_set_rows, png_set_sPLT,
- * and png_set_unknowns do not make their own copies.
+ * More allocation details: all the chunk-reading functions that
+ * change these members go through the corresponding png_set_*
+ * functions.  A function to clear these members is available: see
+ * png_free_data().  The png_set_* functions do not depend on being
+ * able to point info structure members to any of the storage they are
+ * passed (they make their own copies), EXCEPT that the png_set_text
+ * functions use the same storage passed to them in the text_ptr or
+ * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
+ * functions do not make their own copies.
 */
 typedef struct png_info_struct
 {
@@ -695,6 +705,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
   /* iCCP chunk data. */
   png_charp iccp_name;     /* profile name */
   png_charp iccp_profile;  /* International Color Consortium profile data */
+                            /* Note to maintainer: should be png_bytep */
   png_uint_32 iccp_proflen;  /* ICC profile data length */
   png_byte iccp_compression; /* Always zero */
 #endif
@@ -775,6 +786,7 @@ typedef png_info FAR * FAR * png_infopp;

 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
 #define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
+#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
 #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE

 /* These are for the interlacing type.  These values should NOT be changed. */
@@ -815,6 +827,8 @@ typedef png_info FAR * FAR * png_infopp;
 /* This is for text chunks */
 #define PNG_KEYWORD_MAX_LENGTH     79

+/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
+#define PNG_MAX_PALETTE_LENGTH	   256

 /* These determine if an ancillary chunk's data has been successfully read
 * from the PNG header, or if the application has filled in the corresponding
@@ -909,8 +923,9 @@ typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
 #define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */

 /* Flags for MNG supported features */
-#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
-#define PNG_ALL_MNG_FEATURES    0x01
+#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
+#define PNG_FLAG_MNG_FILTER_64      0x04
+#define PNG_ALL_MNG_FEATURES        0x05

 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
@@ -1156,12 +1171,14 @@ struct png_struct_def
   png_fixed_point int_gamma;
 #endif

+   png_byte filter_type;
+
 };

 /* This prevents a compiler error in png_get_copyright() in png.c if png.c
-and png.h are both at * version 1.0.9beta2
+and png.h are both at * version 1.0.9beta7
 */
-typedef png_structp version_1_0_9beta2;
+typedef png_structp version_1_0_9beta7;

 typedef png_struct FAR * FAR * png_structpp;

@@ -2013,12 +2030,14 @@ extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_charpp name, int *compression_type,
   png_charpp profile, png_uint_32 *proflen));
+   /* Note to maintainer: profile should be png_bytepp */
 #endif

 #if defined(PNG_iCCP_SUPPORTED)
 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_charp name, int compression_type,
   png_charp profile, png_uint_32 proflen));
+   /* Note to maintainer: profile should be png_bytep */
 #endif

 #if defined(PNG_READ_sPLT_SUPPORTED)
@@ -2200,7 +2219,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #endif

 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.0.9beta2 - November 19, 2000 (header)\n"
+   " libpng version 1.0.9beta7 - December 28, 2000 (header)\n"

 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2266,6 +2285,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #define PNG_WROTE_tIME             0x200
 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
 #define PNG_BACKGROUND_IS_GRAY     0x800
+#define PNG_HAVE_PNG_SIGNATURE    0x1000

 /* flags for the transformations the PNG library does on the image data */
 #define PNG_BGR                0x0001
@@ -2427,7 +2447,7 @@ PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */

 /* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - DEPRECATED).
+ * (old interface - DEPRECATED - use png_create_read_struct instead).
 */
 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
 #define png_read_init(png_ptr) png_read_init_2(png_ptr, \
@@ -2437,7 +2457,7 @@ extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
    png_info_size));

 /* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - DEPRECATED).
+ * (old interface - DEPRECATED - use png_create_write_struct instead).
 */
 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
 #define png_write_init(png_ptr) png_write_init_2(png_ptr, \
@@ -2584,6 +2604,7 @@ PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
   png_charp name, int compression_type,
   png_charp profile, int proflen));
+   /* Note to maintainer: profile should be png_bytep */
 #endif

 #if defined(PNG_WRITE_sPLT_SUPPORTED)
@@ -2986,6 +3007,13 @@ PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,

 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */

+#ifdef PNG_MNG_FEATURES_SUPPORTED
+PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row));
+PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row));
+#endif
+
 #endif /* PNG_INTERNAL */

 #ifdef __cplusplus
--- a/pngasmrd.h
+++ b/pngasmrd.h
@@ -1,6 +1,6 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
 *
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,6 +1,6 @@
 /* pngconf.h - machine configurable file for libpng
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -33,7 +33,7 @@
 #define PNG_ZBUF_SIZE 8192
 #endif

-#ifndef PNG_NO_FLOATING_POINT_SUPPORTED 
+#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
 #define PNG_FLOATING_POINT_SUPPORTED
 #endif

@@ -53,7 +53,7 @@
 * 'Normal' png-on-win32 defines/defaults:
 *   PNG_BUILD_DLL -- building dll
 *   PNG_USE_DLL   -- building an application, linking to dll
- *   (no define)   -- building static library, or building an 
+ *   (no define)   -- building static library, or building an
 *                    application and linking to the static lib
 * 'Cygwin' defines/defaults:
 *   PNG_BUILD_DLL -- building the dll
@@ -491,9 +491,12 @@
 #endif
 #endif

+/* Disable if you don't need to support PNGs that are embedded in MNG
+   datastreams */
 #ifndef PNG_NO_MNG_FEATURES
-#define PNG_MNG_FEATURES_SUPPORTED  /* Useful for MNG applications */
+#define PNG_MNG_FEATURES_SUPPORTED
 #endif
+
 /* Deprecated, will be removed */
 #ifndef PNG_NO_READ_EMPTY_PLTE
 #define PNG_READ_EMPTY_PLTE_SUPPORTED
@@ -1015,11 +1018,11 @@ typedef z_stream FAR *  png_zstreamp;
 * It is equivalent to Microsoft predefined macro _DLL which is
 * automatically defined when you compile using the share
 * version of the CRT (C Run-Time library)
- * 
- * The cygwin mods make this behavior a little different: 
+ *
+ * The cygwin mods make this behavior a little different:
 * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
 * Define PNG_STATIC if you are building a static library for use with cygwin,
- *   -or- if you are building an application that you want to link to the 
+ *   -or- if you are building an application that you want to link to the
 *   static library.
 * PNG_USE_DLL is defined by default (no user action needed) unless one of
 *   the other flags is defined.
@@ -1051,7 +1054,7 @@ typedef z_stream FAR *  png_zstreamp;
 #    define PNG_USE_LOCAL_ARRAYS
 #  endif
 #endif
-    
+
 /* Do not use global arrays (helps with building DLL's)
 * They are no longer used in libpng itself, since version 1.0.5c,
 * but might be required for some pre-1.0.5c applications.
@@ -1071,8 +1074,8 @@ typedef z_stream FAR *  png_zstreamp;
 #  ifndef PNG_NO_MODULEDEF
 #    define PNG_NO_MODULEDEF
 #  endif
-#endif 
- 
+#endif
+
 #if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
 #  define PNG_IMPEXP
 #endif
@@ -1082,7 +1085,7 @@ typedef z_stream FAR *  png_zstreamp;
       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) \
 	  ) && !defined(__CYGWIN__))

-#  ifdef __GNUC__
+#  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
 #    define PNGAPI __cdecl
 #  else
 #    define PNGAPI _cdecl
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -99,7 +99,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
 void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
   png_format_buffer(png_ptr, msg, message);
   png_error(png_ptr, msg);
 }
--- a/pnggccrd.c
+++ b/pnggccrd.c
@@ -6,7 +6,7 @@
 *     and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
 *     for Intel's performance analysis of the MMX vs. non-MMX code.
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * Copyright (c) 1998, Intel Corporation
@@ -198,7 +198,7 @@
 *     correctly (but 48-bit RGB just fine)
 *
 * 20000916:
- *  - fixed bug in png_read_filter_row_mmx_avg(), bpp == 2 case; three errors:  
+ *  - fixed bug in png_read_filter_row_mmx_avg(), bpp == 2 case; three errors:
 *     - "_ShiftBpp.use = 24;"      should have been   "_ShiftBpp.use = 16;"
 *     - "_ShiftRem.use = 40;"      should have been   "_ShiftRem.use = 48;"
 *     - "psllq _ShiftRem, %%mm2"   should have been   "psrlq _ShiftRem, %%mm2"
@@ -240,22 +240,22 @@ static const int FARDATA png_pass_width[7] = {8, 4, 4, 2, 2, 1, 1};
 #  define _unmask         unmask
 #  define _const4         const4
 #  define _const6         const6
-#  define _mask8_0        mask8_0  
-#  define _mask16_1       mask16_1 
-#  define _mask16_0       mask16_0 
-#  define _mask24_2       mask24_2 
-#  define _mask24_1       mask24_1 
-#  define _mask24_0       mask24_0 
-#  define _mask32_3       mask32_3 
-#  define _mask32_2       mask32_2 
-#  define _mask32_1       mask32_1 
-#  define _mask32_0       mask32_0 
-#  define _mask48_5       mask48_5 
-#  define _mask48_4       mask48_4 
-#  define _mask48_3       mask48_3 
-#  define _mask48_2       mask48_2 
-#  define _mask48_1       mask48_1 
-#  define _mask48_0       mask48_0 
+#  define _mask8_0        mask8_0
+#  define _mask16_1       mask16_1
+#  define _mask16_0       mask16_0
+#  define _mask24_2       mask24_2
+#  define _mask24_1       mask24_1
+#  define _mask24_0       mask24_0
+#  define _mask32_3       mask32_3
+#  define _mask32_2       mask32_2
+#  define _mask32_1       mask32_1
+#  define _mask32_0       mask32_0
+#  define _mask48_5       mask48_5
+#  define _mask48_4       mask48_4
+#  define _mask48_3       mask48_3
+#  define _mask48_2       mask48_2
+#  define _mask48_1       mask48_1
+#  define _mask48_0       mask48_0
 #  define _FullLength     FullLength
 #  define _MMXLength      MMXLength
 #  define _dif            dif
@@ -642,7 +642,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
-               } 
+               }
            } /* end of else */

            break;
@@ -774,7 +774,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
-               } 
+               }
            } /* end of else */

            break;
@@ -921,7 +921,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
-               } 
+               }
            } /* end of else */

            break;
@@ -1246,7 +1246,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
-               } 
+               }
            } /* end of else */

            break;
@@ -1273,7 +1273,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
               png_memcpy(dstptr, srcptr, rep_bytes);
               srcptr += stride;
               dstptr += stride;
-            } 
+            }
            break;
         }       // end 64 bpp

@@ -2095,7 +2095,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
                           : "=c" (dummy_value_c),        // output regs (dummy)
                             "=S" (dummy_value_S),
                             "=D" (dummy_value_D)
- 
+
                           : "1" (sptr),      // esi      // input regs
                             "2" (dp),        // edi
                             "0" (width_mmx)  // ecx
@@ -2153,7 +2153,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
                           : "=c" (dummy_value_c),        // output regs (dummy)
                             "=S" (dummy_value_S),
                             "=D" (dummy_value_D)
- 
+
                           : "1" (sptr),      // esi      // input regs
                             "2" (dp),        // edi
                             "0" (width_mmx)  // ecx
--- a/pngget.c
+++ b/pngget.c
@@ -1,7 +1,7 @@

 /* pngget.c - retrieval of values from info struct
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@

 /* pngpread.c - read a png file in push mode
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngread.c
+++ b/pngread.c
@@ -1,7 +1,7 @@

 /* pngread.c - read a PNG file
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -103,7 +103,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
        removed from version 2.0.0 and beyond because the previous test
        would have already rejected it. */

-     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' && 
+     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' &&
         user_png_ver[0] == '1' && user_png_ver[5] == '\0')
     {
        png_error(png_ptr,
@@ -246,6 +246,8 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
         else
            png_error(png_ptr, "PNG file corrupted by ASCII conversion");
      }
+      if (num_checked < 3)
+         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
   }

   for(;;)
@@ -646,6 +648,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)

   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
      png_ptr->rowbytes + 1);
+   
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif

   if (png_ptr->transformations)
      png_do_read_transformations(png_ptr);
@@ -701,7 +712,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 * not called png_set_interlace_handling(), the display_row buffer will
 * be ignored, so pass NULL to it.
 *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta2
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta7
 */

 void PNGAPI
@@ -750,7 +761,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
 * only call this function once.  If you desire to have an image for
 * each pass of a interlaced image, use png_read_rows() instead.
 *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta2
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta7
 */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,7 +1,7 @@

 /* pngrio.c - functions for data input
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@

 /* pngrtran.c - transforms the data in a row for PNG readers
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -4053,3 +4053,63 @@ png_build_gamma_table(png_structp png_ptr)
 /* To do: install integer version of png_build_gamma_table here */
 #endif

+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(65536+s0+s1)&0xffff;
+            png_uint_32 blue=(65536+s2+s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@

 /* pngrutil.c - utilities to read a PNG file
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -174,7 +174,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
   png_charp text = NULL;
   png_size_t text_size;

-   if (comp_type == PNG_TEXT_COMPRESSION_zTXt)
+   if (comp_type == PNG_COMPRESSION_TYPE_BASE)
   {
      int ret = Z_OK;
      png_ptr->zstream.next_in = (png_bytep)(chunkdata + prefix_size);
@@ -275,7 +275,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
      chunkdata = text;
      *newlength=text_size;
   }
-   else /* if (comp_type != PNG_TEXT_COMPRESSION_zTXt) */
+   else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
   {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
      char umsg[50];
@@ -286,10 +286,8 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
      png_warning(png_ptr, "Unknown zTXt compression type");
 #endif

-      /* Copy what we can of the error message into the text chunk */
-      text_size = (png_size_t)(chunklength - (text - chunkdata));
-      text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
-      png_memcpy(text, msg, text_size);
+      *(chunkdata + prefix_size) = 0x00;
+      *newlength=prefix_size;
   }

   return chunkdata;
@@ -353,8 +351,33 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
      png_error(png_ptr, "Unknown compression method in IHDR");

-   if (filter_type != PNG_FILTER_TYPE_BASE)
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+   if(filter_type != PNG_FILTER_TYPE_BASE)
+   {
+     if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+        (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+        ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+        (color_type == PNG_COLOR_TYPE_RGB || 
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+        png_error(png_ptr, "Unknown filter method in IHDR");
+     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
+        png_warning(png_ptr, "Invalid filter method in IHDR");
+   }
+#else
+   if(filter_type != PNG_FILTER_TYPE_BASE)
      png_error(png_ptr, "Unknown filter method in IHDR");
+#endif

   /* set internal variables */
   png_ptr->width = width;
@@ -362,6 +385,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   png_ptr->bit_depth = (png_byte)bit_depth;
   png_ptr->interlaced = (png_byte)interlace_type;
   png_ptr->color_type = (png_byte)color_type;
+   png_ptr->filter_type = (png_byte)filter_type;

   /* find number of channels */
   switch (png_ptr->color_type)
@@ -397,7 +421,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   png_colorp palette;
+   png_color palette[PNG_MAX_PALETTE_LENGTH];
   int num, i;
 #ifndef PNG_NO_POINTER_INDEXING
   png_colorp pal_ptr;
@@ -426,7 +450,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   }
 #endif

-   if (length > 768 || length % 3)
+   if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
   {
      if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
      {
@@ -442,8 +466,6 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)

   num = (int)length / 3;

-   palette = (png_colorp)png_zalloc(png_ptr, (uInt)num, sizeof (png_color));
-
 #ifndef PNG_NO_POINTER_INDEXING
   for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
   {
@@ -493,7 +515,6 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
         else
         {
            png_chunk_warning(png_ptr, "CRC error");
-            png_zfree(png_ptr, palette);
            return;
         }
      }
@@ -504,15 +525,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
      }
   }
 #endif
-   png_ptr->palette = palette;
-   png_ptr->num_palette = (png_uint_16)num;

-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
-   png_ptr->free_me |= PNG_FREE_PLTE;
-#else
-   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
-#endif
   png_set_PLTE(png_ptr, info_ptr, palette, num);

 #if defined(PNG_READ_tRNS_SUPPORTED)
@@ -1065,7 +1078,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   }

   png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type,
-                chunkdata + prefix_length, data_length-prefix_length);
+                chunkdata + prefix_length, profile_length);
   png_free(png_ptr, chunkdata);
 }
 #endif /* PNG_READ_iCCP_SUPPORTED */
@@ -1202,6 +1215,8 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
+   png_byte	readbuf[PNG_MAX_PALETTE_LENGTH];
+
   png_debug(1, "in png_handle_tRNS\n");

   if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -1239,8 +1254,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
         return;
      }

-      png_ptr->trans = (png_bytep)png_malloc(png_ptr, length);
-      png_crc_read(png_ptr, png_ptr->trans, (png_size_t)length);
+      png_crc_read(png_ptr, readbuf, (png_size_t)length);
      png_ptr->num_trans = (png_uint_16)length;
   }
   else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
@@ -1285,15 +1299,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   if (png_crc_finish(png_ptr, 0))
      return;

-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      png_ptr->free_me |= PNG_FREE_TRNS;
-#else
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      png_ptr->flags |= PNG_FLAG_FREE_TRNS;
-#endif
-   png_set_tRNS(png_ptr, info_ptr, png_ptr->trans, png_ptr->num_trans,
+   png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
      &(png_ptr->trans_values));
 }
 #endif
@@ -1392,6 +1398,7 @@ void /* PRIVATE */
 png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
   int num, i;
+   png_uint_16	readbuf[PNG_MAX_PALETTE_LENGTH];

   png_debug(1, "in png_handle_hIST\n");

@@ -1416,34 +1423,26 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
      return;
   }

-   if (length != (png_uint_32)(2 * png_ptr->num_palette))
+   num = (int)length / 2 ;
+   if (num != png_ptr->num_palette)
   {
      png_warning(png_ptr, "Incorrect hIST chunk length");
      png_crc_finish(png_ptr, length);
      return;
   }

-   num = (int)length / 2 ;
-   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
-      (png_uint_32)(num * sizeof (png_uint_16)));
   for (i = 0; i < num; i++)
   {
      png_byte buf[2];

      png_crc_read(png_ptr, buf, 2);
-      png_ptr->hist[i] = png_get_uint_16(buf);
+      readbuf[i] = png_get_uint_16(buf);
   }

   if (png_crc_finish(png_ptr, 0))
      return;

-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
-   png_ptr->free_me |= PNG_FREE_HIST;
-#else
-   png_ptr->flags |= PNG_FLAG_FREE_HIST;
-#endif
-   png_set_hIST(png_ptr, info_ptr, png_ptr->hist);
+   png_set_hIST(png_ptr, info_ptr, readbuf);
 }
 #endif

@@ -1922,6 +1921,11 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   else
   {
       comp_type = *(++text);
+       if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
+       {
+          png_warning(png_ptr, "Unknown compression type in zTXt chunk");
+          comp_type = PNG_TEXT_COMPRESSION_zTXt;
+       }
       text++;        /* skip the compression_method byte */
   }
   prefix_len = text - chunkdata;
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@

 /* pngset.c - storage of image information into info struct
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -133,12 +133,31 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
 void PNGAPI
 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 {
+   int	i;
+
   png_debug1(1, "in %s storage function\n", "hIST");
   if (png_ptr == NULL || info_ptr == NULL)
      return;
+   if (info_ptr->num_palette == 0)
+       png_warning(png_ptr,
+		   "Palette size 0, hIST allocation skipped.");

-   info_ptr->hist = hist;
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+#endif
+   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
+      (png_uint_32)(info_ptr->num_palette * sizeof (png_uint_16)));
+
+   for (i = 0; i < info_ptr->num_palette; i++)
+       png_ptr->hist[i] = hist[i];
+   info_ptr->hist = png_ptr->hist;
   info_ptr->valid |= PNG_INFO_hIST;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_HIST;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_HIST;
+#endif
 }
 #endif

@@ -320,9 +339,26 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   info_ptr->palette = palette;
+   /*
+    * It may not actually be necessary to set png_ptr->palette here;
+    * we do it for backward compatibility with the way the png_handle_tRNS
+    * function used to do the allocation.
+    */
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
+#endif
+   png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
+      sizeof (png_color));
+   memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
+   info_ptr->palette = png_ptr->palette;
+   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PLTE;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
+#endif

-   info_ptr->num_palette = (png_uint_16)num_palette;
   info_ptr->valid |= PNG_INFO_PLTE;
 }

@@ -631,7 +667,23 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
      return;

   if (trans != NULL)
-      info_ptr->trans = trans;
+   {
+       /*
+	* It may not actually be necessary to set png_ptr->trans here;
+	* we do it for backward compatibility with the way the png_handle_tRNS
+	* function used to do the allocation.
+	*/
+#ifdef PNG_FREE_ME_SUPPORTED
+       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+#endif
+       png_ptr->trans = info_ptr->trans = png_malloc(png_ptr, num_trans);
+       memcpy(info_ptr->trans, trans, num_trans);
+#ifdef PNG_FREE_ME_SUPPORTED
+       info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
+   }

   if (trans_values != NULL)
   {
@@ -730,7 +782,7 @@ void PNGAPI
 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
   int chunk, int location)
 {
-   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < 
+   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
         (int)info_ptr->unknown_chunks_num)
      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,7 +1,7 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -1449,4 +1449,4 @@ main(int argc, char *argv[])
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_9beta2 your_png_h_is_not_version_1_0_9beta2;
+typedef version_1_0_9beta7 your_png_h_is_not_version_1_0_9beta7;
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,7 +1,7 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -606,3 +606,4 @@ png_get_user_transform_ptr(png_structp png_ptr)
   return (NULL);
 #endif
 }
+
--- a/pngvcrd.c
+++ b/pngvcrd.c
@@ -2,7 +2,7 @@
 *
 * For Intel x86 CPU and Microsoft Visual C++ compiler
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * Copyright (c) 1998, Intel Corporation
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,7 +1,7 @@

 /* pngwio.c - functions for data output
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,7 +1,7 @@

 /* pngwrite.c - general routines to write a PNG file
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -28,6 +28,13 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
   {
   png_write_sig(png_ptr); /* write PNG signature */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
+   {
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+      png_ptr->mng_features_permitted=0;
+   }
+#endif
   /* write IHDR information. */
   png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
      info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
@@ -57,7 +64,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #endif
 #if defined(PNG_WRITE_iCCP_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_iCCP)
-      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_TEXT_COMPRESSION_zTXt,
+      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
                     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif
 #if defined(PNG_WRITE_sBIT_SUPPORTED)
@@ -375,7 +382,11 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)

   /* write end of PNG file */
   png_write_IEND(png_ptr);
+#if 0
+/* This flush, added in libpng-1.0.8,  causes some applications to crash
+   because they do not set png_ptr->output_flush_fn */
   png_flush(png_ptr);
+#endif
 }

 #if defined(PNG_WRITE_tIME_SUPPORTED)
@@ -488,7 +499,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
        removed from version 2.0.0 and beyond because the previous test
        would have already rejected it. */

-     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' && 
+     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' &&
         user_png_ver[0] == '1' && user_png_ver[5] == '\0')
     {
        png_error(png_ptr,
@@ -769,6 +780,24 @@ png_write_row(png_structp png_ptr, png_bytep row)
   if (png_ptr->transformations)
      png_do_write_transformations(png_ptr);

+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
   /* Find a filter if necessary, filter the row and write it out. */
   png_write_find_filter(png_ptr, &(png_ptr->row_info));

@@ -964,6 +993,11 @@ void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
   png_debug(1, "in png_set_filter\n");
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (method == PNG_INTRAPIXEL_DIFFERENCING))
+         method = PNG_FILTER_TYPE_BASE;
+#endif
   if (method == PNG_FILTER_TYPE_BASE)
   {
      switch (filters & (PNG_ALL_FILTERS | 0x07))
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,7 +1,7 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -498,3 +498,64 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
   }
 }
 #endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(s0-s1)&0xffff;
+            png_uint_32 blue=(s2-s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,7 +1,7 @@

 /* pngwutil.c - utilities to write a PNG file
 *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta7 - December 28, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -131,6 +131,8 @@ png_write_sig(png_structp png_ptr)
   /* write the rest of the 8 byte signature */
   png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
      (png_size_t)8 - png_ptr->sig_bytes);
+   if(png_ptr->sig_bytes < 3)
+      png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
 }

 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
@@ -419,7 +421,24 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
      compression_type = PNG_COMPRESSION_TYPE_BASE;
   }

-   if (filter_type != PNG_FILTER_TYPE_BASE)
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if (
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+      !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+      (color_type == PNG_COLOR_TYPE_RGB || 
+       color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
+      (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
+#endif
+      filter_type != PNG_FILTER_TYPE_BASE)
   {
      png_warning(png_ptr, "Invalid filter type specified");
      filter_type = PNG_FILTER_TYPE_BASE;
@@ -440,6 +459,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
   png_ptr->bit_depth = (png_byte)bit_depth;
   png_ptr->color_type = (png_byte)color_type;
   png_ptr->interlaced = (png_byte)interlace_type;
+   png_ptr->filter_type = (png_byte)filter_type;
   png_ptr->width = width;
   png_ptr->height = height;

@@ -657,7 +677,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
      return;
   }

-   if (compression_type)
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
      png_warning(png_ptr, "Unknown compression type in iCCP chunk");

   if (profile == NULL)
@@ -665,7 +685,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,

   if (profile_len)
       profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
-          PNG_TEXT_COMPRESSION_zTXt, &comp);
+          PNG_COMPRESSION_TYPE_BASE, &comp);

   /* make sure we include the NULL after the name and the compression type */
   png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
@@ -1072,13 +1092,14 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
   png_size_t key_len;
   png_charp kp, dp;
   int kflag;
+   int kwarn=0;

   png_debug(1, "in png_check_keyword\n");
   *new_key = NULL;

   if (key == NULL || (key_len = png_strlen(key)) == 0)
   {
-      png_chunk_warning(png_ptr, "zero length keyword");
+      png_warning(png_ptr, "zero length keyword");
      return ((png_size_t)0);
   }

@@ -1095,9 +1116,9 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
         char msg[40];

         sprintf(msg, "invalid keyword character 0x%02X", *kp);
-         png_chunk_warning(png_ptr, msg);
+         png_warning(png_ptr, msg);
 #else
-         png_chunk_warning(png_ptr, "invalid character in keyword");
+         png_warning(png_ptr, "invalid character in keyword");
 #endif
         *dp = ' ';
      }
@@ -1112,7 +1133,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
   kp = *new_key + key_len - 1;
   if (*kp == ' ')
   {
-      png_chunk_warning(png_ptr, "trailing spaces removed from keyword");
+      png_warning(png_ptr, "trailing spaces removed from keyword");

      while (*kp == ' ')
      {
@@ -1125,7 +1146,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
   kp = *new_key;
   if (*kp == ' ')
   {
-      png_chunk_warning(png_ptr, "leading spaces removed from keyword");
+      png_warning(png_ptr, "leading spaces removed from keyword");

      while (*kp == ' ')
      {
@@ -1147,6 +1168,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
      else if (*kp == ' ')
      {
         key_len--;
+         kwarn=1;
      }
      else
      {
@@ -1155,17 +1177,19 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
      }
   }
   *dp = '\0';
+   if(kwarn)
+      png_warning(png_ptr, "extra interior spaces removed from keyword");

   if (key_len == 0)
   {
      png_free(png_ptr, *new_key);
      *new_key=NULL;
-      png_chunk_warning(png_ptr, "Zero length keyword");
+      png_warning(png_ptr, "Zero length keyword");
   }

   if (key_len > 79)
   {
-      png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters");
+      png_warning(png_ptr, "keyword length must be 1 - 79 characters");
      new_key[79] = '\0';
      key_len = 79;
   }
--- a/projects/msvc/README.txt
+++ b/projects/msvc/README.txt
@@ -1,5 +1,5 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for
-libpng 1.0.9beta2 (November 19, 2000) and zlib
+libpng 1.0.9beta7 (December 28, 2000) and zlib

 Copyright (C) 2000 Simon-Pierre Cadieux
 For conditions of distribution and use, see copyright notice in png.h
--- a/projects/msvc/png.rc
+++ b/projects/msvc/png.rc
@@ -50,23 +50,18 @@
 #  define VS_SPECIALBUILD 0
 #endif /* SPECIALBUILD */

-#if defined(PNG_LIBPNG_BUILD_TYPE)
-#  if (PNG_LIBPNG_BUILD_TYPE != stable)
-#    if(PNG_LIBPNG_BUILD_TYPE == patched)
-#      define VS_PATCHED VS_FF_PATCHED
-#      define VS_PRERELEASE 0
-#    else
-#      define VS_PRERELEASE VS_FF_PRERELEASE
-#      define VS_PATCHED 0
-#    endif
-#  else
-#    define VS_PRERELEASE 0
-#    define VS_PATCHED 0
-#  endif /* PNG_LIBPNG_BUILD_TYPE != stable */
+#if ((PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_TYPEMASK) != \
+      PNG_LIBPNG_BUILD_STABLE)
+#  define VS_PRERELEASE VS_FF_PRERELEASE
+#  define VS_PATCHED 0
 #else
 #  define VS_PRERELEASE 0
-#  define VS_PATCHED 0
-#endif /* PNG_LIBPNG_BUILD_TYPE */
+#  if (PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_PATCHED)
+#    define VS_PATCHED VS_FF_PATCHED
+#  else
+#    define VS_PATCHED 0
+#  endif
+#endif

 VS_VERSION_INFO VERSIONINFO 
 FILEVERSION PNG_LIBPNG_VER_MAJOR, PNG_LIBPNG_VER_MINOR, PNG_LIBPNG_VER_RELEASE, PNG_LIBPNG_VER_BUILD
--- a/projects/msvc/png32ms.def
+++ b/projects/msvc/png32ms.def
@@ -6,7 +6,7 @@ LIBRARY
 DESCRIPTION "PNG image compression library for Windows"

 EXPORTS
-;Version 1.0.9beta2
+;Version 1.0.9beta7
  png_build_grayscale_palette  @1
  png_check_sig        @2
  png_chunk_error      @3
--- a/projects/wince/READMEE.WCE
+++ b/projects/wince/READMEE.WCE
@@ -8,9 +8,9 @@ libpng for WindowsCE Rel.1.0

 Introduction
 ============
-This is libpng 1.0.9beta2 ported to WindowsCE 2.0 and 2.11.
-libpng 1.0.9beta2 is a PNG reference library.
-See README, a document of original libpng 1.0.9beta2.
+This is libpng 1.0.9beta7 ported to WindowsCE 2.0 and 2.11.
+libpng 1.0.9beta7 is a PNG reference library.
+See README, a document of original libpng 1.0.9beta7.

 zlib for WindowsCE
 ==================
@@ -23,7 +23,7 @@ This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.

-See README and LICENSE, documents of original libpng 1.0.9beta2, for conditions
+See README and LICENSE, documents of original libpng 1.0.9beta7, for conditions
 of use and distribution.

 Files
--- a/projects/wince/READMEJ.WCE
+++ b/projects/wince/READMEJ.WCE
@@ -24,7 +24,7 @@ libpng
 <EFBFBD>ɂȂ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȃ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Q<EFBFBD>ɂ<EFBFBD><EFBFBD>Ă<EFBFBD><EFBFBD>A<EFBFBD><EFBFBD><EFBFBD>ҁA<EFBFBD>z<EFBFBD>z<EFBFBD>ҁA<EFBFBD><EFBFBD><EFBFBD>̑<EFBFBD><EFBFBD><EFBFBD><EFBFBD>p<EFBFBD>҈ȊO<EFBFBD>̐l<EFBFBD><EFBFBD><EFBFBD>A
 <EFBFBD>c<EFBFBD>̂ɐӔC<EFBFBD><EFBFBD><EFBFBD>Ƃ<EFBFBD><EFBFBD>`<60><><EFBFBD>͂Ȃ<CD82><C882><EFBFBD><EFBFBD>̂Ƃ<CC82><C682>܂<EFBFBD><DC82>B

-<EFBFBD><EFBFBD><EFBFBD>̑<EFBFBD><EFBFBD>A<EFBFBD><EFBFBD><EFBFBD>̃\<5C>t<EFBFBD>g<EFBFBD>E<EFBFBD>F<EFBFBD>A<EFBFBD>̗<EFBFBD><CC97>p<EFBFBD><70><EFBFBD><EFBFBD><EFBFBD>ɂ<C982><C282>ẮA<CD81><41><EFBFBD>łł<C582><C582><EFBFBD> libpng 1.0.9beta2<EFBFBD><EFBFBD>
+<EFBFBD><EFBFBD><EFBFBD>̑<EFBFBD><EFBFBD>A<EFBFBD><EFBFBD><EFBFBD>̃\<5C>t<EFBFBD>g<EFBFBD>E<EFBFBD>F<EFBFBD>A<EFBFBD>̗<EFBFBD><CC97>p<EFBFBD><70><EFBFBD><EFBFBD><EFBFBD>ɂ<C982><C282>ẮA<CD81><41><EFBFBD>łł<C582><C582><EFBFBD> libpng 1.0.9beta7<EFBFBD><EFBFBD>
 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̂Ƃ<EFBFBD><EFBFBD>܂<EFBFBD><EFBFBD>B<EFBFBD>ڂ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>́A<EFBFBD>t<EFBFBD><EFBFBD><EFBFBD><EFBFBD> README,LICENSE <20><><EFBFBD><EFBFBD><EFBFBD>ǂ݂<C782><DD82><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>B

 <EFBFBD><EFBFBD><EFBFBD>^<5E><><EFBFBD>e
--- a/projects/wince/png32ce.def
+++ b/projects/wince/png32ce.def
@@ -5,7 +5,7 @@
 LIBRARY lpngce

 EXPORTS
-;Version 1.0.9beta2
+;Version 1.0.9beta7
  png_build_grayscale_palette  @1
  png_check_sig        @2
  png_chunk_error      @3
--- a/scripts/makefile.acorn
+++ b/scripts/makefile.acorn
@@ -2,40 +2,40 @@


 # Toolflags:
-CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah 
+CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
 C++flags = -c -depend !Depend -IC: -throwback
 Linkflags = -aif -c++ -o $@
 ObjAsmflags = -throwback -NoCache -depend !Depend
 CMHGflags = 
-LibFileflags = -c -l -o $@ 
+LibFileflags = -c -l -o $@
 Squeezeflags = -o $@


 # Final targets:
@.libpng-lib:   @.o.png @.o.pngerror @.o.pngrio @.o.pngwio @.o.pngmem \
 	@.o.pngpread @.o.pngset @.o.pngget @.o.pngread @.o.pngrtran \
-	@.o.pngrutil @.o.pngtrans @.o.pngwrite @.o.pngwtran @.o.pngwutil 
+	@.o.pngrutil @.o.pngtrans @.o.pngwrite @.o.pngwtran @.o.pngwutil
 	LibFile $(LibFileflags) @.o.png @.o.pngerror @.o.pngrio @.o.pngrtran \
 	@.o.pngmem @.o.pngpread @.o.pngset @.o.pngget @.o.pngread @.o.pngwio \
-	@.o.pngrutil @.o.pngtrans  @.o.pngwrite @.o.pngwtran @.o.pngwutil 
+	@.o.pngrutil @.o.pngtrans  @.o.pngwrite @.o.pngwtran @.o.pngwutil
@.mm-libpng-lib:   @.mm.png @.mm.pngerror @.mm.pngrio @.mm.pngwio @.mm.pngmem \
 	@.mm.pngpread @.mm.pngset @.mm.pngget @.mm.pngread @.mm.pngrtran \
-	@.mm.pngrutil @.mm.pngtrans @.mm.pngwrite @.mm.pngwtran @.mm.pngwutil 
+	@.mm.pngrutil @.mm.pngtrans @.mm.pngwrite @.mm.pngwtran @.mm.pngwutil
 	LibFile $(LibFileflags) @.mm.png @.mm.pngerror @.mm.pngrio \
 	@.mm.pngwio @.mm.pngmem @.mm.pngpread @.mm.pngset @.mm.pngget \
 	@.mm.pngread @.mm.pngrtran @.mm.pngrutil @.mm.pngtrans @.mm.pngwrite \
-	@.mm.pngwtran @.mm.pngwutil 
+	@.mm.pngwtran @.mm.pngwutil


 # User-editable dependencies:
 # (C) Copyright 1997 Tom Tanner
-Test: @.pngtest 
+Test: @.pngtest
 	<Prefix$Dir>.pngtest
 	@remove <Prefix$Dir>.pngtest

 #It would be nice if you could stop "make" listing from here on!
-@.pngtest:   @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib 
-	Link $(Linkflags) @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib 
+@.pngtest:   @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib
+	Link $(Linkflags) @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib

 .SUFFIXES: .o .mm .c

--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -0,0 +1,84 @@
+# makefile for libpng using gcc (generic, static library)
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# Copyright (C) 2000 Cosmin Truta
+# Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Location of the zlib library and include files
+ZLIBINC = ../zlib
+ZLIBLIB = ../zlib
+
+# Compiler, linker, lib and other tools
+CC = gcc
+LD = $(CC)
+AR = ar rcs
+RANLIB = ranlib
+RM = rm -f
+
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
+PNGMAJ = 2
+PNGMIN = 1.0.9beta7
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+CDEBUG = -g -DPNG_DEBUG=5
+LDDEBUG =
+CRELEASE = -O2
+LDRELEASE = -s
+CFLAGS = -I$(ZLIBINC) -Wall $(CRELEASE)
+LDFLAGS = -L. -L$(ZLIBLIB) -lpng -lz -lm $(LDRELEASE)
+
+# File extensions
+O=.o
+A=.a
+E=
+
+# Variables
+OBJS = png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
+	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) pngset$(O) \
+	pngtrans$(O) pngwio$(O) pngwrite$(O) pngwtran$(O) pngwutil$(O)
+
+# Targets
+all: libpng$(A) pngtest$(E)
+
+libpng$(A): $(OBJS)
+	$(AR) $@ $(OBJS)
+	$(RANLIB) $@
+
+test: pngtest$(E)
+	./pngtest$(E)
+
+pngtest$(E): pngtest$(O) libpng$(A)
+	$(LD) -o $@ pngtest$(O) $(LDFLAGS)
+
+install: libpng.a
+	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
+	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
+	cp png.h pngconf.h $(INCPATH)
+	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
+	cp libpng.a $(LIBPATH)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+png$(O): png.h pngconf.h
+pngerror$(O): png.h pngconf.h
+pngget$(O): png.h pngconf.h
+pngmem$(O): png.h pngconf.h
+pngpread$(O): png.h pngconf.h
+pngread$(O): png.h pngconf.h
+pngrio$(O): png.h pngconf.h
+pngrtran$(O): png.h pngconf.h
+pngrutil$(O): png.h pngconf.h
+pngset$(O): png.h pngconf.h
+pngtest$(O): png.h pngconf.h
+pngtrans$(O): png.h pngconf.h
+pngwio$(O): png.h pngconf.h
+pngwrite$(O): png.h pngconf.h
+pngwtran$(O): png.h pngconf.h
+pngwutil$(O): png.h pngconf.h
+
--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -14,7 +14,7 @@ CC=sc
 #          So use V6.55 or set NOOPTGO!!!!!!!!!
 CFLAGS= NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
 	OPTLOOP OPTRDEP=4 OPTDEP=4 OPTCOMP=4 INCLUDEDIR=$(ZLIB) \
-	DEFINE=PNG_INTERNAL 
+	DEFINE=PNG_INTERNAL
 #linker flags
 LDFLAGS= SD ND BATCH
 #link libs
--- a/scripts/makefile.bd32
+++ b/scripts/makefile.bd32
@@ -21,7 +21,7 @@ PNGLIB=png32bd.lib

 CC=bcc32
 CFLAGS= -ps -O2 -N- -k- -d -r- -w-par -w-aus -I$(ZLIBDIR) \
-  -DPNG_NO_GLOBAL_ARRAYS #-DPNG_DEBUG=5
+	-DPNG_NO_GLOBAL_ARRAYS #-DPNG_DEBUG=5
 #LINK=tlink32
 #LINK=ilink32
 LINK=bcc32
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -31,7 +31,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # where make install puts libpng.a, libpng.so*, and png.h
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -2,7 +2,7 @@
 #   builds both dll (with import lib) and static lib versions
 #   of the library, and builds two copies of pngtest: one
 #   statically linked and one dynamically linked.
-#   
+#
 #   based on makefile for linux-elf w/mmx by:
 # Copyright (C) 1998-2000 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
@@ -33,12 +33,12 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 #CFLAGS=-DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
 #        -fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
 CFLAGS=-I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
-        -fomit-frame-pointer 
+	-fomit-frame-pointer

 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 SHAREDLIB=cygpng$(PNGMAJ).dll
@@ -108,7 +108,7 @@ $(SHAREDDEF): msvc/png32ms.def
 	cat $< | sed -e '1{G;s/^\(.*\)\(\n\)/EXPORTS/;};2,/^EXPORTS/d' > $@

 $(SHAREDLIB): $(OBJSDLL) $(SHAREDDEF)
-	$(LDSHARED) -o $@ $(LDEXTRA) $(OBJSDLL) -L. -L$(ZLIBLIB) -lz 
+	$(LDSHARED) -o $@ $(LDEXTRA) $(OBJSDLL) -L. -L$(ZLIBLIB) -lz

 pngtest$(EXE): pngtest.pic.o $(SHAREDLIB)
 	$(CC) $(CFLAGS) $< $(LDFLAGS) -o $@
@@ -132,7 +132,7 @@ test-shared: pngtest$(EXE)

 install: install-static install-shared

-install-static: $(STATLIB) install-headers install-docs install-man 
+install-static: $(STATLIB) install-headers install-docs install-man
 	-@if [ ! -d $(LIBPATH) ]; then mkdir -p $(LIBPATH); fi
 	install -m 755 $(STATLIB) $(LIBPATH)

--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -17,7 +17,7 @@ ZLIBINC=../zlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 CC=cc
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -27,7 +27,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 # for pgcc version 2.95.1, -O3 is buggy; don't use it.

 CFLAGS=-DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
-        -fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
+	-fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
 LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm

@@ -37,7 +37,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # where make install puts libpng.a and png.h
--- a/scripts/makefile.intel
+++ b/scripts/makefile.intel
@@ -42,9 +42,9 @@ LDFLAGS=/SUBSYSTEM:CONSOLE /NOLOGO

 O=.obj

-OBJS=png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O)\
-     pngmem$(O) pngpread$(O) pngread$(O) pngerror$(O) pngwrite$(O)\
-     pngrtran$(O) pngwtran$(O) pngrio$(O) pngwio$(O) pngvcrd$(O)
+OBJS=png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O) \
+pngmem$(O) pngpread$(O) pngread$(O) pngerror$(O) pngwrite$(O) \
+pngrtran$(O) pngwtran$(O) pngrio$(O) pngwio$(O) pngvcrd$(O)


 all: test
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -34,7 +34,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
--- a/scripts/makefile.macosx
+++ b/scripts/makefile.macosx
@@ -0,0 +1,72 @@
+# makefile for libpng, MACOS X
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# For conditions of distribution and use, see copyright notice in png.h
+
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+
+# Where the zlib library and include files are located
+#ZLIBLIB=/usr/local/lib
+#ZLIBINC=/usr/local/include
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+CC=cc
+CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz
+
+#RANLIB=echo
+RANLIB=ranlib
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o
+
+all: libpng.a pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@  $(OBJS)
+	$(RANLIB) $@
+
+pngtest: pngtest.o libpng.a
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a
+	-@mkdir $(prefix)/include
+	-@mkdir $(prefix)/lib
+	cp png.h $(prefix)/include
+	cp pngconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/png.h
+	chmod 644 $(prefix)/include/pngconf.h
+	cp libpng.a $(prefix)/lib
+	chmod 644 $(prefix)/lib/libpng.a
+
+clean:
+	rm -f *.o libpng.a pngtest pngout.png
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o: png.h pngconf.h
+pngerror.o: png.h pngconf.h
+pngrio.o: png.h pngconf.h
+pngwio.o: png.h pngconf.h
+pngmem.o: png.h pngconf.h
+pngset.o: png.h pngconf.h
+pngget.o: png.h pngconf.h
+pngread.o: png.h pngconf.h
+pngrtran.o: png.h pngconf.h
+pngrutil.o: png.h pngconf.h
+pngtest.o: png.h pngconf.h
+pngtrans.o: png.h pngconf.h
+pngwrite.o: png.h pngconf.h
+pngwtran.o: png.h pngconf.h
+pngwutil.o: png.h pngconf.h
+pngpread.o: png.h pngconf.h
+
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -9,7 +9,7 @@ CFLAGS=-Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
-LDFLAGS=/e/st:0x1500/noe 
+LDFLAGS=/e/st:0x1500/noe
 O=.obj

 #uncomment next to put error messages in a file
@@ -76,7 +76,7 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
 	lib libpng $(OBJS2);
 	lib libpng $(OBJS3);

-pngtest.exe: pngtest.obj libpng.lib 
+pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) pngtest.obj,,,libpng.lib ..\zlib\zlib.lib ;

 test: pngtest.exe
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -16,7 +16,7 @@ prefix=/usr/local
 ZLIBLIB=../zlib
 ZLIBINC=../zlib

-CFLAGS= -dy -belf -I$(ZLIBINC) -O3 
+CFLAGS= -dy -belf -I$(ZLIBINC) -O3
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm

 #RANLIB=ranlib
@@ -25,7 +25,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -19,8 +19,8 @@ CFLAGS=-I$(ZLIBINC) -O2 $(WARNMORE) -fPIC -mabi=n32 # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=gcc -shared

-VER=1.0.9beta2
-LIBS=libpng.so.1.0.9beta2
+VER=1.0.9beta7
+LIBS=libpng.so.1.0.9beta7
 SHAREDLIB=libpng.so
 libdir=$(prefix)/lib32

--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -31,7 +31,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta2
+PNGMIN = 1.0.9beta7
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
--- a/scripts/makefile.vcawin32
+++ b/scripts/makefile.vcawin32
@@ -84,7 +84,7 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
 	del libpng.lib
 	lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

-pngtest.exe: pngtest.obj libpng.lib 
+pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) pngtest.obj libpng.lib ..\zlib\zlib.lib /OUT:pngtest.exe /SUBSYSTEM:CONSOLE

 test: pngtest.exe
--- a/scripts/makefile.vcwin32
+++ b/scripts/makefile.vcwin32
@@ -77,7 +77,7 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
 	del libpng.lib
 	lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

-pngtest.exe: pngtest.obj libpng.lib 
+pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) pngtest.obj libpng.lib ..\zlib\zlib.lib /OUT:pngtest.exe /SUBSYSTEM:CONSOLE

 test: pngtest.exe
--- a/scripts/makevms.com
+++ b/scripts/makevms.com
@@ -14,7 +14,7 @@ $   @makevms
 $   set def [-.pngminus]
 $   @makevms
 $   set def [--]
-$   exit 
+$   exit
 $ endif
 $ Make = ""
 $ If F$Search ("Sys$System:MMS.EXE") .nes. "" Then Make = "MMS"
@@ -54,7 +54,7 @@ $ if make.eqs.""
 $  then
 $   dele pngtest.obj;*
 $   CALL MAKE png.OBJ "cc ''CCOPT' png" -
-	png.c png.h pngconf.h   
+	png.c png.h pngconf.h
 $   CALL MAKE pngpread.OBJ "cc ''CCOPT' pngpread" -
 					 pngpread.c png.h pngconf.h
 $   CALL MAKE pngset.OBJ "cc ''CCOPT' pngset" -
@@ -90,8 +90,8 @@ $   CALL MAKE libpng.OLB "lib/crea libpng.olb *.obj" *.OBJ
 $   write sys$output "Building pngtest..."
 $   CALL MAKE pngtest.OBJ "cc ''CCOPT' pngtest" -
 	pngtest.c png.h pngconf.h
-$   call make pngtest.exe - 
-	"LINK pngtest,libpng.olb/lib,''zlibsrc'libz.olb/lib" - 
+$   call make pngtest.exe -
+	"LINK pngtest,libpng.olb/lib,''zlibsrc'libz.olb/lib" -
 	pngtest.obj libpng.olb
 $   write sys$output "Testing Libpng..."
 $   run pngtest
--- a/scripts/pngdef.pas
+++ b/scripts/pngdef.pas
@@ -5,7 +5,7 @@ unit pngdef;
 interface

 const
-  PNG_LIBPNG_VER_STRING = '1.0.9beta2';
+  PNG_LIBPNG_VER_STRING = '1.0.9beta7';
  PNG_LIBPNG_VER        =  10009;

 type
@@ -209,7 +209,7 @@ const
  PNG_CRC_WARN_DISCARD = 2;  // (INVALID)           warn/discard data
  PNG_CRC_WARN_USE     = 3;  // warn/use data       warn/use data
  PNG_CRC_QUIET_USE    = 4;  // quiet/use data      quiet/use data
-  PNG_CRC_NO_CHANGE    = 5;  // use current value   use current value 
+  PNG_CRC_NO_CHANGE    = 5;  // use current value   use current value

 // Flags for png_set_filter() to say which filters to use.  The flags
 // are chosen so that they don't conflict with real filter types
@@ -241,7 +241,7 @@ const
  PNG_FILTER_HEURISTIC_DEFAULT    = 0;  // Currently "UNWEIGHTED"
  PNG_FILTER_HEURISTIC_UNWEIGHTED = 1;  // Used by libpng < 0.95
  PNG_FILTER_HEURISTIC_WEIGHTED   = 2;  // Experimental feature
-  PNG_FILTER_HEURISTIC_LAST       = 3;  // Not a valid value 
+  PNG_FILTER_HEURISTIC_LAST       = 3;  // Not a valid value

 procedure png_build_grayscale_palette(bit_depth: int; palette: png_colorp);
             stdcall;
@@ -340,7 +340,7 @@ function png_get_oFFs(png_ptr: png_structp; info_ptr: png_infop;
             var unit_type: int): png_uint_32;
             stdcall;
 function png_get_sCAL(png_ptr: png_structp; info_ptr: png_infop;
-             var unit:int; var width: png_uint_32; height: png_uint_32): 
+             var unit:int; var width: png_uint_32; height: png_uint_32):
             png_uint_32;
             stdcall
 function png_get_pCAL(png_ptr: png_structp; info_ptr: png_infop;
@@ -373,7 +373,7 @@ function png_get_sBIT(png_ptr: png_structp; info_ptr: png_infop;
             stdcall;
 function png_get_sRGB(png_ptr: png_structp; info_ptr: png_infop;
             var file_srgb_intent: int): png_uint_32;
-             stdcall; 
+             stdcall;
 function png_get_signature(png_ptr: png_structp; info_ptr: png_infop):
             png_bytep;
             stdcall;
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -297,11 +297,11 @@ EXPORTS
  png_pass_dsp_mask
 ; png_pass_width
 ; png_pass_height
-  png_get_iCCP 
+  png_get_iCCP
  png_get_sCAL
-  png_get_sPLT 
-  png_set_iCCP 
-  png_set_sPLT 
+  png_get_sPLT
+  png_set_iCCP
+  png_set_sPLT
  png_free_data

  png_IHDR
Author	SHA1	Message	Date
Glenn Randers-Pehrson	76e5fd642e	Imported from libpng-1.0.9beta7.tar	2009-04-06 16:05:49 -05:00
Glenn Randers-Pehrson	f05f8033b8	Imported from libpng-1.0.9rc1.tar	2009-04-06 16:05:47 -05:00
Glenn Randers-Pehrson	408b421265	Imported from libpng-1.0.9beta6.tar	2009-04-06 16:05:45 -05:00
Glenn Randers-Pehrson	2ad31ae31f	Imported from libpng-1.0.9beta5.tar	2009-04-06 16:05:43 -05:00
Glenn Randers-Pehrson	f6b4f45c7e	Imported from libpng-1.0.9beta4.tar	2009-04-06 16:05:41 -05:00
Glenn Randers-Pehrson	d56aca7104	Imported from libpng-1.0.9beta3.tar	2009-04-06 16:05:39 -05:00