Imported from libpng-1.0.6a.tar

ANNOUNCE

 
-Libpng 1.0.6 - March 21, 2000
+Libpng 1.0.6a - April 2, 2000
 
-This is a public release of libpng, intended for use in production codes.
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.
 
-Changes since the last public release (1.0.5):
+Changes since the last public release (1.0.6):
 
-  Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
-  Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
-  Further optimization and bugfix of pngvcrd.c
-  Revised pngset.c so that it does not allocate or free memory in the user's
-    text_ptr structure.  Instead, it makes its own copy.
-  Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
-  Created separate write_end_info_struct in pngtest.c for a more severe test.
-  Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
-    PNG_FLAG_WROTE_tIME from flags to mode.
-  Added png_write_info_before_PLTE() function.
-  Fixed some typecasting in contrib/gregbook/*.c
-  Updated scripts/makevms.com (Martin Zinser)
-  Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
-  Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
-    accomodate making DLL's: Moved usr_png_ver from global variable to function
-    png_get_header_ver() in png.c.  Moved png_sig to png_sig_bytes in png.c and
-    eliminated use of png_sig in pngwutil.c.  Moved the various png_CHNK arrays
-    into local arrays.  Eliminated use of global png_pass arrays.  Declared the
-    png_CHNK and png_pass arrays to be "const".  Made the global arrays
-    available to applications when PNG_NO_GLOBAL_ARRAYS is not defined or
-    when PNG_USE_GLOBAL_ARRAYS is defined.  Made available to applications a
-    macro "PNG_USE_LOCAL_ARRAYS".
-  Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
-  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
-  Added PNG_EXPORT_VAR macro to accommodate making DLL's.
-  Refactored the inflate/deflate support to make adding new chunks with
-    trailing compressed parts easier in the future (Eric S. Raymond).
-  Added iCCP, iTXt, sCAL, and sPLT support; added "lang", "lang_key", and
-    itxt_length" members to the png_text structure (Eric S. Raymond, Glenn R-P)
-  Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
-    offsets (Eric S. Raymond).
-  Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
-    PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
-    macros, leaving the separate macros also available.
-  Removed comments on #endifs at the end of many short, non-nested #if-blocks.
-  Changed makefile.solaris to issue a warning about potential problems when
-    the ucb "ld" is in the path ahead of the ccs "ld".
-  Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
-  Added code in pngwrite.c to work around a newly discovered zlib bug.
-  Unknown chunk handling is now supported (Eric S. Raymond).
-  Option to eliminate all floating point support was added.  Some new
-    fixed-point functions such as png_set_gAMA_fixed() were added.
-  Added new type "png_fixed_point" for integers that hold float*100000 values
-  Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
-  Added png_handle_as_unknown()
-  Added chunk_list and num_chunk_list members of png_ptr.
-  Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
-  Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
-    for setting a callback function to handle unknown chunks and for
-    retrieving the associated user pointer (Glenn).
-  Added png_free_data() function.
-  Added high-level functions png_read_png() and png_write_png() (ESR).
-  Renamed pngdll.mak to makefile.bd32
-  Cosmetic changes in pngtest.c
-  Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
-  Revised makefile.gcmmx
-  Fixed a bug in pngrtran.c that improperly expanded the background color.
-  Return *num_text=0 from png_get_text() when appropriate, and fix documentation
-    of png_get_text() in libpng.txt/libpng.3.
-  Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() and
-    "png_jmpbuf()" macros to pngconf.h, to help people migrate to the new error
-    handler that's planned for the next libpng release, and changed example.c,
-    pngtest.c, and contrib programs to use this macro.
-  Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
-  Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
-    in pngget.c
-  Updated makefile.linux and makefile.gccmmx to make directories conditionally.
-  Increased precision of rgb_to_gray calculations from 8 to 15 bits and
-    added png_set_rgb_to_gray_fixed() function.
-  Added makefile.bc32 (32-bit Borland C++, C mode)
-  Updated references to the zlib home page, which has moved to freesoftware.com.
-  Corrected bugs in documentation regarding png_read_row() and png_write_row().
-  Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
-    revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
-  Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6a [April 2, 2000]
+  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
+  Added data_length parameter to png_decompress_chunk() function
+  Revised documentation to remove reference to abandoned png_free_chnk functions
+  Fixed an error in png_rgb_to_gray_fixed()
+  Revised example.c, usage of png_destroy_write_struct().
+  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
+  Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
+  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

CHANGES

@@ -657,6 +657,20 @@ version 1.0.5v [March 11, 2000]
   Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
   Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
     revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
-version 1.0.6 [March 21, 2000]
+version 1.0.6 [March 20, 2000]
   Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
   Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6a [April 2, 2000]
+  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
+  Added data_length parameter to png_decompress_chunk() function
+  Revised documentation to remove reference to abandoned png_free_chnk functions
+  Fixed an error in png_rgb_to_gray_fixed()
+  Revised example.c, usage of png_destroy_write_struct().
+  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
+  Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
+  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
+
+Send comments/corrections/commendations to
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
+
+Glenn R-P

INSTALL

 
-Installing libpng version 1.0.6 - March 21, 2000
+Installing libpng version 1.0.6a - April 2, 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-1.0.6" or "lpng106" and "zlib-1.1.3"
+might be called "libpng-1.0.6a" or "lpng106" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -47,8 +47,8 @@ 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.2.1.0.6)
- makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6,
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6a)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6a,
                        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
@@ -56,11 +56,12 @@ include
                        ftp://ftp.cs.wisc.edu/ghost)
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
- makefile.ibmvac3  =>  IBM VisualAge/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
- makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.6)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.6a)
  makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.6)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.6a)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.mips     =>  MIPS makefile
  makefile.acorn    =>  Acorn makefile

KNOWNBUG

 
 Known bugs and suggested enhancements in libpng-1.0.6
 
+1. April 1, 2000 -- BUG
 
-1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
+   Under some circumstances old applications that make direct access to
+   the info_ptr->text and its members might free the same memory that
+   is also free'ed by libpng during the png_destroy_struct process.
+
+   Fixed in libpng-1.0.6-patch-c and libpng-1.0.6a.  The PNG_FREE_TEXT flag
+   bit in info_ptr->free_me is now checked to make sure libpng is responsible
+   for freeing the memory.
+
+2. April 1, 2000 -- BUG
+
+   The non-ISO-C "strdup()" function is used in png.c
+
+   STATUS: The function has been simplified and no longer uses strdup()
+   in libpng-1.0.6-patch-c and libpng-1.0.6a.
+
+3. March 24, 2000 -- BUG
+
+   The png_set_rgb_to_gray_fixed() function is setting incorrect weighting
+   factors.
+
+   STATUS: Fixed in libpng-1.0.6-patch-b and libpng-1.0.6a.
+
+4. March 22, 2000 -- BUG
+
+   There are some printf() and fprintf() statements active in pngwutil.c
+   when PNG_NO_STDIO and PNG_sCAL_SUPPORTED are both defined.
+
+   STATUS: Fixed in libpng-1.0.6-patch-a and libpng-1.0.6a.  The strcpy()
+   function is used instead.
+
+5. March 22, 2000 -- BUG
+
+   The length of the iCCP chunk data is calculated incorrectly; because
+   it can contain zeroes, strlen() doesn't work.
+
+   STATUS: Fixed in libpng-1.0.6-patch-a by adding a data_length parameter
+   to the png_decompress_chunk() function.
+
+6. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
 
    Loops need to be optimized everywhere
 
@@ -17,7 +56,7 @@ Known bugs and suggested enhancements in libpng-1.0.6
    libpng-1.1.0.  About 160 loops will be turned around
    in libpng-1.1.Nn, for testing.
 
-2. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
+7. 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
@@ -29,7 +68,7 @@ Known bugs and suggested enhancements in libpng-1.0.6
 
    STATUS: under development.
 
-3. September 1999 -- ENHANCEMENT --
+8. September 1999 -- ENHANCEMENT --
 
    It should be possible to use libpng without floating-point aritmetic.
 
@@ -38,6 +77,6 @@ Known bugs and suggested enhancements in libpng-1.0.6
    for the png_set_gAMA(), png_set_cHRM(), and corresponding png_get_()
    functions will be needed.
 
-   Much of this was completed in libpng-1.0.5h, but gamma compensation
+   Much of this was completed in libpng-1.0.6, but gamma compensation
    is not yet done in fixed-point arithmetic.
 

LICENSE

@@ -5,7 +5,7 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 Copyright (c) 1996, 1997 Andreas Dilger
 (libpng versions 0.90, December 1996, through 0.96, May 1997)
 Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
-(libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
+(libpng versions 0.97, January 1998, through 1.0.6a, April 2, 2000)
 
 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:
@@ -68,4 +68,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-March 21, 2000
+April 2, 2000

README

-README for libpng 1.0.6 - March 21, 2000 (shared library 2.1)
+README for libpng 1.0.6a - April 2, 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.
@@ -172,9 +172,9 @@ 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.2.1.0.6)
+                            (gcc, creates libpng.so.2.1.0.6a)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng.so.2.1.0.6, uses assembler code
+                            libpng.so.2.1.0.6a, 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
@@ -182,12 +182,13 @@ Files in this distribution:
                             ftp://ftp.cs.wisc.edu/ghost)
        makefile.dec     =>  DEC Alpha UNIX makefile
        makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
-       makefile.ibmvac3 =>  IBM VisualAge/C++ ver 3.x for Win32, OS/2 (static)
+       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
+       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.6)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.6a)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.6)
+                            (gcc, creates libpng.so.2.1.0.6a)
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
        makefile.mips    =>  MIPS makefile
        makefile.acorn   =>  Acorn makefile

Y2KINFO

    Y2K compliance in libpng:
    =========================
 
-      March 21, 2000
+      April 2, 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 1.0.6 are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.6a 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

configure

 echo "
-  There is no \"configure\" script for Libpng-1.0.6.  Instead, please
+  There is no \"configure\" script for Libpng-1.0.6a.  Instead, please
   copy the appropriate makefile for your system from the \"scripts\"
   directory.  Read the INSTALL file for more details.
 "

example.c

@@ -54,7 +54,7 @@ int check_if_png(char *file_name, FILE **fp)
    char buf[PNG_BYTES_TO_CHECK];
 
    /* Open the prospective PNG file. */
-   if ((*fp = fopen(file_name, "rb")) != NULL);
+   if ((*fp = fopen(file_name, "rb")) == NULL)
       return 0;
 
    /* Read in some of the signature bytes */
@@ -565,7 +565,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    {
       /* If we get here, we had a problem reading the file */
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
+      png_destroy_write_struct(&png_ptr,  (png_infopp)info_ptr);
       return;
    }
 
@@ -761,7 +761,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    png_free(png_ptr, trans);
 
    /* clean up after the write, and free any memory allocated */
-   png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+   png_destroy_write_struct(&png_ptr, (png_infopp)info_ptr);
 
    /* close the file */
    fclose(fp);

libpng.3

-.TH LIBPNG 3 "March 21, 2000"
+.TH LIBPNG 3 "April 2, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6a
 .SH SYNOPSIS
 \fI\fB
 
@@ -713,7 +713,7 @@ 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 1.0.6 - March 21, 2000
+ libpng version 1.0.6a - April 2, 2000
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alum.rpi.edu>
  Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -1834,8 +1834,9 @@ point to libpng-allocated storage with the following functions:
                    (-1 for all items)
 
 These functions may be safely called when the relevant storage has
-already been freed, or has not yet been allocated, and will in that
-case do nothing.  The "n" parameter is ignored if only one item
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng,  and will in those
+cases do nothing.  The "n" parameter is ignored if only one item
 of the selected data type, such as PLTE, is allowed.  If "n" is not
 -1, and multiple items are allowed for the data type identified in
 the mask, such as text or splt, only the n'th item is freed.
@@ -2509,7 +2510,7 @@ make sure to only enable a transformation if it will be valid for the
 data.  For example, don't swap red and blue on grayscale data.
 
 PNG files store RGB pixels packed into 3 or 6 bytes.  This code tells
-the library to trip input data that has 4 or 8 bytes per pixel down
+the library to strip input data that has 4 or 8 bytes per pixel down
 to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
 bytes per pixel).
 
@@ -2712,30 +2713,24 @@ When you are done, you can free all memory used by libpng like this:
 It is also possible to individually free the info_ptr members that
 point to libpng-allocated storage with the following functions:
 
-    png_free_text(png_ptr, info_ptr, num)
-    num          - number of text item to be freed (-1 for all items)
-
-    png_free_hIST(png_ptr, info_ptr)
-
-    png_free_iCCP(png_ptr, info_ptr)
-
-    png_free_pCAL(png_ptr, info_ptr)
-
-    png_free_sCAL(png_ptr, info_ptr)
-
-    png_free_sPLT(png_ptr, info_ptr, num)
-    num          - number of suggested-paletted entry to be freed
-                   (-1 for all suggested palettes)
-
-    png_free_pixels(png_ptr, info_ptr)
-
-    png_free_unknown_chunk(png_ptr, info_ptr, num)
-    num          - number of unknown chunk entry to be freed
-                   (-1 for all suggested palettes)
+    png_free_data(png_ptr, info_ptr, mask, n)
+    mask         - identifies data to be freed, a mask
+                   made up by the OR one or more of
+                   PNG_FREE_PLTE, PNG_FREE_TRNS,
+                   PNG_FREE_HIST, PNG_FREE_ICCP,
+                   PNG_FREE_SPLT, PNG_FREE_ROWS,
+                   PNG_FREE_PCAL, PNG_FREE_SCAL,
+                   PNG_FREE_TEXT, PNG_FREE_UNKN,
+                   or simply PNG_FREE_ALL
+    n            - sequence number of item to be freed
+                   (-1 for all items)
 
 These functions may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, and will in that
-case do nothing.
+case do nothing.  The "n" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed.  If "n" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or splt, only the n'th item is freed.
 
 If you allocated data such as a palette that you passed in to libpng with
 png_set_*, you must not free it until just before the call to
@@ -3113,13 +3108,13 @@ the old method.
 
 .SH VII. Y2K Compliance in libpng
 
-March 21, 2000
+April 2, 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 1.0.6 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.6a 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
@@ -3176,21 +3171,35 @@ on the library has not always been consistent and straightforward.
 The following table summarizes matters since version 0.89c, which was
 the first widely used release:
 
-   source     png.h   png.h   shared-lib
-   version    string    int   version
-   -------    ------  ------  ----------
-   0.89c      0.89        89  1.0.89
-   0.90       0.90        90  0.90  [should be 2.0.90]
-   0.95       0.95        95  0.95  [should be 2.0.95]
-   0.96       0.96        96  0.96  [should be 2.0.96]
-   0.97b      1.00.97     97  1.0.1 [should be 2.0.97]
-   0.97c      0.97        97  2.0.97
-   0.98       0.98        98  2.0.98
-   0.99       0.99        98  2.0.99
-   0.99a-m    0.99        99  2.0.99
-   1.00       1.00       100  2.1.0 [int should be 10000]
-   1.0.0      1.0.0      100  2.1.0 [int should be 10000]
-   1.0.1      1.0.1    10001  2.1.0
+   source                   png.h    png.h   shared-lib
+   version                  string     int   version
+   -------                  ------   -----  ----------
+   0.89c ("1.0 beta 3")     0.89        89  1.0.89
+   0.90  ("1.0 beta 4")     0.90        90  0.90  [should have been 2.0.90]
+   0.95  ("1.0 beta 5")     0.95        95  0.95  [should have been 2.0.95]
+   0.96  ("1.0 beta 6")     0.96        96  0.96  [should have been 2.0.96]
+   0.97b ("1.00.97 beta 7") 1.00.97     97  1.0.1 [should have been 2.0.97]
+   0.97c                    0.97        97  2.0.97
+   0.98                     0.98        98  2.0.98
+   0.99                     0.99        98  2.0.99
+   0.99a-m                  0.99        99  2.0.99
+   1.00                     1.00       100  2.1.0 [100 should be 10000]
+   1.0.0                    1.0.0      100  2.1.0 [100 should be 10000]
+   1.0.1                    1.0.1    10001  2.1.0
+   1.0.1a-e                 1.0.1a-e 10002  2.1.0.1a-e
+   1.0.2                    1.0.2    10002  2.1.0.2
+   1.0.2a-b                 1.0.2a-b 10003  2.1.0.2a-b
+   1.0.3                    1.0.3    10003  2.1.0.3
+   1.0.3a-d                 1.0.3a-d 10004  2.1.0.3a-d
+   1.0.4                    1.0.4    10004  2.1.0.4
+   1.0.4a-f                 1.0.4a-f 10005  2.1.0.4a-f
+   1.0.5                    1.0.5    10005  2.1.0.5
+   1.0.5a-d                 1.0.5a-d 10006  2.1.0.5a-d
+   1.0.5e-r                 1.0.5e-r 10100  2.1.0.5e-r (not compatible)
+   1.0.5s-v                 1.0.5s-v 10006  2.1.0.5s-v (compatible)
+   1.0.6                    1.0.6    10006  2.1.0.6
+   1.0.6a                   1.0.6a   10007  2.1.0.6a
+   1.3.0                    1.3.0    10300  3.1.3.0
 
 Henceforth the source version will match the shared-library
 minor and patch numbers; the shared-library major version number will be
@@ -3245,7 +3254,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.0.6 - March 21, 2000:
+Libpng version 1.0.6a - April 2, 2000:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
 
@@ -3256,11 +3265,11 @@ Supported by the PNG development group
 .SH COPYRIGHT NOTICE:
 
 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
-(libpng versions 0.5, May 1995, through 0.89c, May 1996)
+(libpng versions 0.5, May 1995, through 0.88, January 1996)
 Copyright (c) 1996, 1997 Andreas Dilger
-(libpng versions 0.90, December 1996, through 0.96, May 1997)
+(libpng versions 0.89c, May 1996, through 0.96, May 1997)
 Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
-(libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
+(libpng versions 0.97, January 1998, through 1.0.6a, April 2, 2000)
 
 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:

libpng.txt

 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.6 - March 21, 2000
+ libpng version 1.0.6a - April 2, 2000
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alum.rpi.edu>
  Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -1121,8 +1121,9 @@ point to libpng-allocated storage with the following functions:
                    (-1 for all items)
 
 These functions may be safely called when the relevant storage has
-already been freed, or has not yet been allocated, and will in that
-case do nothing.  The "n" parameter is ignored if only one item
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng,  and will in those
+cases do nothing.  The "n" parameter is ignored if only one item
 of the selected data type, such as PLTE, is allowed.  If "n" is not
 -1, and multiple items are allowed for the data type identified in
 the mask, such as text or splt, only the n'th item is freed.
@@ -1796,7 +1797,7 @@ make sure to only enable a transformation if it will be valid for the
 data.  For example, don't swap red and blue on grayscale data.
 
 PNG files store RGB pixels packed into 3 or 6 bytes.  This code tells
-the library to trip input data that has 4 or 8 bytes per pixel down
+the library to strip input data that has 4 or 8 bytes per pixel down
 to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
 bytes per pixel).
 
@@ -1999,30 +2000,24 @@ When you are done, you can free all memory used by libpng like this:
 It is also possible to individually free the info_ptr members that
 point to libpng-allocated storage with the following functions:
 
-    png_free_text(png_ptr, info_ptr, num)
-    num          - number of text item to be freed (-1 for all items)
-
-    png_free_hIST(png_ptr, info_ptr)
-
-    png_free_iCCP(png_ptr, info_ptr)
-
-    png_free_pCAL(png_ptr, info_ptr)
-
-    png_free_sCAL(png_ptr, info_ptr)
-
-    png_free_sPLT(png_ptr, info_ptr, num)
-    num          - number of suggested-paletted entry to be freed
-                   (-1 for all suggested palettes)
-
-    png_free_pixels(png_ptr, info_ptr)
-
-    png_free_unknown_chunk(png_ptr, info_ptr, num)
-    num          - number of unknown chunk entry to be freed
-                   (-1 for all suggested palettes)
+    png_free_data(png_ptr, info_ptr, mask, n)
+    mask         - identifies data to be freed, a mask
+                   made up by the OR one or more of
+                   PNG_FREE_PLTE, PNG_FREE_TRNS,
+                   PNG_FREE_HIST, PNG_FREE_ICCP,
+                   PNG_FREE_SPLT, PNG_FREE_ROWS,
+                   PNG_FREE_PCAL, PNG_FREE_SCAL,
+                   PNG_FREE_TEXT, PNG_FREE_UNKN,
+                   or simply PNG_FREE_ALL
+    n            - sequence number of item to be freed
+                   (-1 for all items)
 
 These functions may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, and will in that
-case do nothing.
+case do nothing.  The "n" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed.  If "n" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or splt, only the n'th item is freed.
 
 If you allocated data such as a palette that you passed in to libpng with
 png_set_*, you must not free it until just before the call to
@@ -2400,13 +2395,13 @@ the old method.
 
 VII. Y2K Compliance in libpng
 
-March 21, 2000
+April 2, 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 1.0.6 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.6a 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

libpngpf.3

-.TH LIBPNGPF 3 March 21, 2000
+.TH LIBPNGPF 3 April 2, 2000
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6a
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -55,6 +55,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6
 
 \fI\fB
 
+\fBpng_charp png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
 
 \fI\fB

png.5

-.TH PNG 5 "March 21, 2000"
+.TH PNG 5 "April 2, 2000"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.6 - March 21, 2000
+ * libpng version 1.0.6a - April 2, 2000
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -14,14 +14,14 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_6 Your_png_h_is_not_version_1_0_6;
+typedef version_1_0_6a Your_png_h_is_not_version_1_0_6a;
 
 /* 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 */
-char png_libpng_ver[12] = "1.0.6";
+char png_libpng_ver[12] = "1.0.6a";
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -269,7 +269,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num
 
 #if defined(PNG_TEXT_SUPPORTED)
 /* free text item num or (if num == -1) all text items */
-if (mask & PNG_FREE_TEXT)
+if (mask & PNG_FREE_TEXT & info_ptr->free_me & PNG_FREE_TEXT)
 {
    if (num != -1)
    {
@@ -535,17 +535,16 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 png_bytep
 png_sig_bytes(png_structp png_ptr)
 {
-   const png_byte png_sig_numbers[9] = {137, 80, 78, 71, 13, 10, 26, 10, 0};
-   if (png_ptr == NULL) /* silence compiler warning */
-     return ((png_bytep) strdup((png_const_charp)png_sig_numbers));
-   return ((png_bytep) strdup((png_const_charp)png_sig_numbers));
+   if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
+     return ("\212\120\116\107\015\012\032\012");
+   return ("");
 }
 
 png_charp
 png_get_copyright(png_structp png_ptr)
 {
    if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ("\n libpng version 1.0.6 - March 21, 2000\n\
+   return ("\n libpng version 1.0.6a - April 2, 2000\n\
    Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
    Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson\n");
@@ -563,8 +562,8 @@ 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("1.0.6");
-   return("1.0.6");
+      return("1.0.6a");
+   return("1.0.6a");
 }
 
 png_charp

png.h

 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.0.6 - March 21, 2000
+ * libpng version 1.0.6a - April 2, 2000
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  *
  * Authors and maintainers:
- *  libpng versions 0.71, May 1995, through 0.89c, May 1996: Guy Schalnat
- *  libpng versions 0.90, December 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.0.6 - March 21, 2000: Glenn
+ *  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 1.0.6a - April 2, 2000: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -45,8 +45,9 @@
  *    1.0.5                    1.0.5    10005  2.1.0.5
  *    1.0.5a-d                 1.0.5a-d 10006  2.1.0.5a-d
  *    1.0.5e-r                 1.0.5e-r 10100  2.1.0.5e-r (not compatible)
- *    1.0.5s-v                 1.0.5s-v 10006  2.1.0.5s-w (compatible)
+ *    1.0.5s-v                 1.0.5s-v 10006  2.1.0.5s-v (compatible)
  *    1.0.6                    1.0.6    10006  2.1.0.6
+ *    1.0.6a                   1.0.6a   10007  2.1.0.6a
  *    1.3.0                    1.3.0    10300  3.1.3.0
  *
  *    Henceforth the source version will match the shared-library minor
@@ -64,14 +65,16 @@
  */
 
 /*
- * COPYRIGHT NOTICE:
+ * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+ *
+ * If you modify libpng you may insert additional notices after this sentence.
  *
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * (libpng versions 0.5, May 1995, through 0.89c, May 1996)
+ * (libpng versions 0.5, May 1995, through 0.88, January 1996)
  * Copyright (c) 1996, 1997 Andreas Dilger
- * (libpng versions 0.90, December 1996, through 0.96, May 1997)
+ * (libpng versions 0.89c, June 1996, through 0.96, May 1997)
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
- * (libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
+ * (libpng versions 0.97, January 1998, through 1.0.6a, April 2, 2000)
  *
  * For the purposes of this copyright and license, "Contributing Authors"
  * is defined as the following set of individuals:
@@ -146,13 +149,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    March 21, 2000
+ *    April 2, 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 1.0.6 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.6a 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
@@ -230,14 +233,14 @@ extern "C" {
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.6"
+#define PNG_LIBPNG_VER_STRING "1.0.6a"
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=bugfix */
-#define PNG_LIBPNG_VER    10006  /* 1.0.6 */
+#define PNG_LIBPNG_VER    10007  /* 1.0.7 */
 
 /* Note to maintainer: update this number in scripts/pngdef.pas as well */
 
@@ -651,13 +654,12 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    double scal_pixel_width;    /* width of one pixel */
    double scal_pixel_height;   /* height of one pixel */
-#else
+#endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
    png_charp scal_s_width;     /* string containing height */
    png_charp scal_s_height;    /* string containing width */
 #endif
 #endif
-#endif
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
    /* storage for unknown chunks that the library doesn't recognize. */
@@ -1056,9 +1058,9 @@ struct png_struct_def
 };
 
 /* This prevents a compiler error in png_get_copyright() in png.c if png.c
-and png.h are both at * version 1.0.6
+and png.h are both at * version 1.0.6a
  */
-typedef png_structp version_1_0_6;
+typedef png_structp version_1_0_6a;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -2031,7 +2033,7 @@ extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)
 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
 
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.0.6 - March 21, 2000 (header)\n"
+   " libpng version 1.0.6a - April 2, 2000 (header)\n"
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2304,7 +2306,7 @@ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
     defined(PNG_READ_iCCP_SUPPORTED) || defined(PNG_READ_sPLT_SUPPORTED)
 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
    int comp_type, png_charp chunkdata, png_size_t chunklength,
-   png_size_t prefix_size));
+   png_size_t prefix_length, png_size_t *data_length));
 #endif
 
 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
@@ -2468,7 +2470,7 @@ PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
 #endif
 
 #if defined(PNG_WRITE_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
    int unit, double width, double height));
 #else

pngasmrd.h

 /* pngasmrd.h - assembler version of utilities to read a PNG file
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
  *

pngconf.h

 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngerror.c

 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

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 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, Intel Corporation
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson

pngget.c

 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngmem.c

 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngpread.c

 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngread.c

 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -641,7 +641,7 @@ 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 1.0.6.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6a.
  */
 
 void
@@ -690,7 +690,7 @@ 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 1.0.6.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6a.
  */
 void
 png_read_image(png_structp png_ptr, png_bytepp image)

pngrio.c

 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngrtran.c

 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -622,7 +622,7 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
 #endif
    {
       png_uint_16 red_int, green_int;
-      if(red > 0 && green > 0)
+      if(red < 0 || green < 0)
       {
          red_int   =  6968; /* .212671 * 32768 + .5 */
          green_int = 23434; /* .715160 * 32768 + .5 */

pngrutil.c

 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -143,7 +143,7 @@ png_crc_error(png_structp png_ptr)
  */
 png_charp png_decompress_chunk(png_structp png_ptr, int comp_type,
                               png_charp chunkdata, png_size_t chunklength,
-                              png_size_t prefix_size)
+                              png_size_t prefix_size, png_size_t *newlength)
 {
    static char msg[] = "Error decoding compressed text";
    png_charp text = NULL;
@@ -227,6 +227,7 @@ png_charp png_decompress_chunk(png_structp png_ptr, int comp_type,
 
       png_free(png_ptr, chunkdata);
       chunkdata = text;
+      *newlength=text_size;
    }
    else /* if (comp_type >= PNG_TEXT_COMPRESSION_LAST) */
    {
@@ -889,7 +890,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_byte compression_type;
    png_charp profile;
    png_uint_32 skip = 0;
-   png_size_t slength, prefix_length;
+   png_size_t slength, prefix_length, data_length;
 
    png_debug(1, "in png_handle_iCCP\n");
 
@@ -951,10 +952,10 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    prefix_length = profile - chunkdata;
    chunkdata = png_decompress_chunk(png_ptr, compression_type, chunkdata,
-                                    slength, prefix_length);
+                                    slength, prefix_length, &data_length);
 
    png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type,
-                chunkdata + prefix_length, png_strlen(chunkdata + prefix_length));
+                chunkdata + prefix_length, data_length);
    png_free(png_ptr, chunkdata);
 }
 #endif /* PNG_READ_iCCP_SUPPORTED */
@@ -1722,7 +1723,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_charp chunkdata;
    png_charp text;
    int comp_type;
-   png_size_t slength, prefix_len;
+   png_size_t slength, prefix_len, data_len;
 
    png_debug(1, "in png_handle_zTXt\n");
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -1770,7 +1771,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    prefix_len = text - chunkdata;
 
    chunkdata = (png_charp)png_decompress_chunk(png_ptr, comp_type, chunkdata,
-                                    (png_size_t)length, prefix_len);
+                                    (png_size_t)length, prefix_len, &data_len);
 
    text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
    text_ptr->compression = comp_type;
@@ -1778,7 +1779,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    text_ptr->key = chunkdata;
    text_ptr->lang_key = NULL;
    text_ptr->text = chunkdata + prefix_len;
-   text_ptr->text_length = png_strlen(text);
+   text_ptr->text_length = data_len;
    text_ptr->itxt_length = 0;
 
    png_set_text(png_ptr, info_ptr, text_ptr, 1);
@@ -1798,7 +1799,7 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_charp key, lang, text, lang_key;
    int comp_flag;
    int comp_type = 0;
-   png_size_t slength, prefix_len;
+   png_size_t slength, prefix_len, data_len;
 
    png_debug(1, "in png_handle_iTXt\n");
 
@@ -1862,7 +1863,9 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    key=chunkdata;
    if (comp_flag)
        chunkdata = png_decompress_chunk(png_ptr, comp_type, chunkdata,
-          (size_t)length, prefix_len);
+          (size_t)length, prefix_len, &data_len);
+   else
+       data_len=png_strlen(chunkdata + prefix_len);
    text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
    text_ptr->compression = (int)comp_flag + 1;
    text_ptr->lang_key = chunkdata+(lang_key-key);
@@ -1870,7 +1873,7 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    text_ptr->key = chunkdata;
    text_ptr->text = chunkdata + prefix_len;
    text_ptr->text_length = 0;
-   text_ptr->itxt_length = png_strlen(text_ptr->text);
+   text_ptr->itxt_length = data_len;
 
    png_set_text(png_ptr, info_ptr, text_ptr, 1);
 

pngset.c

 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngtest.c

 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -1344,4 +1344,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_6 your_png_h_is_not_version_1_0_6;
+typedef version_1_0_6a your_png_h_is_not_version_1_0_6a;

pngtrans.c

 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngvcrd.c

@@ -2,7 +2,7 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, Intel Corporation
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson

pngwio.c

 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngwrite.c

 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -165,13 +165,16 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 #endif
 #if defined(PNG_WRITE_sCAL_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sCAL)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
       png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
 #else
 #ifdef PNG_FIXED_POINT_SUPPORTED
       png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_s_width, info_ptr->scal_s_height);
+#else
+      png_warning(png_ptr,
+          "png_write_sCAL not supported; sCAL chunk not written.\n");
 #endif
 #endif
 #endif

pngwtran.c

 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger

pngwutil.c

 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 1.0.6 - March 21, 2000
+ * libpng 1.0.6a - April 2, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
@@ -795,7 +795,9 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
        white_x + white_y > 1.0)
    {
       png_warning(png_ptr, "Invalid cHRM white point specified");
+#if !defined(PNG_NO_STDIO)
       printf("white_x=%f, white_y=%f\n",white_x, white_y);
+#endif
       return;
    }
    itemp = (png_uint_32)(white_x * 100000.0 + 0.5);
@@ -856,7 +858,9 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
    {
       png_warning(png_ptr, "Invalid fixed cHRM white point specified");
+#if !defined(PNG_NO_STDIO)
       printf("white_x=%ld, white_y=%ld\n",white_x, white_y);
+#endif
       return;
    }
    png_save_uint_32(buf, white_x);
@@ -1381,7 +1385,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
 
 #if defined(PNG_WRITE_sCAL_SUPPORTED)
 /* write the sCAL chunk */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
 void
 png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
 {
@@ -1417,10 +1421,10 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
    png_size_t total_len;
    char wbuf[32], hbuf[32];
 
-   png_debug(1, "in png_write_sCAL\n");
+   png_debug(1, "in png_write_sCAL_s\n");
 
-   sprintf(wbuf, "%s", width);
-   sprintf(hbuf, "%s", height);
+   strcpy(wbuf,(const char *)width);
+   strcpy(hbuf,(const char *)height);
    total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
 
    png_debug1(3, "sCAL total length = %d\n", total_len);

scripts/libpng.icc

+// Project file for libpng (static)
+// IBM VisualAge/C++ version 4.0 or later
+// Copyright (C) 2000 Cosmin Truta
+// Notes:
+//   All modules are compiled in C mode
+//   Tested with IBM VAC++ 4.0 under Win32
+//   Expected to work with IBM VAC++ 4.0 or later under OS/2 and Win32
+//   Can be easily adapted for IBM VAC++ 4.0 or later under AIX
+// For conditions of distribution and use, see copyright notice in png.h
+
+option incl(searchpath, "../zlib"), opt(level, "2"),
+ link(libsearchpath, "../zlib")
+{
+   target type(lib) "libpng.lib"
+   {
+      source type(c) "png.c"
+      source type(c) "pngerror.c"
+      source type(c) "pngget.c"
+      source type(c) "pngmem.c"
+      source type(c) "pngpread.c"
+      source type(c) "pngread.c"
+      source type(c) "pngrio.c"
+      source type(c) "pngrtran.c"
+      source type(c) "pngrutil.c"
+      source type(c) "pngset.c"
+      source type(c) "pngtrans.c"
+      source type(c) "pngwio.c"
+      source type(c) "pngwrite.c"
+      source type(c) "pngwtran.c"
+      source type(c) "pngwutil.c"
+   }
+}
+
+option incl(searchpath, "../zlib"), opt(level, "2"),
+ link(libsearchpath, "../zlib")
+{
+   target type(exe) "pngtest.exe"
+   {
+      source type(c) "pngtest.c"
+      source type(lib) "libpng.lib"
+      source type(lib) "zlib.lib"
+   }
+}

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 = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h

scripts/makefile.dec

@@ -14,7 +14,7 @@ ZLIBINC=../zlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 CC=cc

scripts/makefile.gcmmx

@@ -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 = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/makefile.ibmvac3 → scripts/makefile.ibmc

-# Makefile for libpng
-# IBM VisualAge/C++ version 3.x for Win32 and OS/2 (static)
+# Makefile for libpng (static)
+# IBM C version 3.x for Win32 and OS/2
 # Copyright (C) 2000 Cosmin Truta
 # Notes:
 #   Derived from makefile.std
 #   All modules are compiled in C mode
-#   Tested with VAC++ 3.6.5 under Win32, expected to work under OS/2 too
+#   Tested with IBM C 3.6.5 under Win32, expected to work under OS/2 too
 #   Can be easily adapted for IBM VisualAge/C++ for AIX
 # For conditions of distribution and use, see copyright notice in png.h
 

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 = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/makefile.sco

@@ -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 = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

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=1.0.6
-LIBS=libpng.so.1.0.6
+VER=1.0.6a
+LIBS=libpng.so.1.0.6a
 SHAREDLIB=libpng.so
 libdir=$(prefix)/lib32
 

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 = 1.0.6
+PNGMIN = 1.0.6a
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/pngdef.pas

@@ -3,8 +3,8 @@ unit pngdef;
 interface
 
 const
-  PNG_LIBPNG_VER_STRING = '1.0.6';
-  PNG_LIBPNG_VER        =  10006;
+  PNG_LIBPNG_VER_STRING = '1.0.6a';
+  PNG_LIBPNG_VER        =  10007;
 
 type
   png_uint_32 = Cardinal;