Imported from libpng-1.0.6h.tar

Imported from libpng-1.0.6g.tar
Imported from libpng-1.0.6f.tar
2025-07-10 18:04:09 +02:00 · 2009-04-06 16:05:01 -05:00 · 2009-04-06 16:04:59 -05:00 · 2009-04-06 16:04:58 -05:00 · 2009-04-06 16:04:56 -05:00 · 2009-04-06 16:04:55 -05:00
78 changed files with 10719 additions and 2730 deletions
--- a/112
+++ b/112
@@ -1,85 +1,45 @@

-Libpng 1.0.5h - December 10, 1999
+Libpng 1.0.6h - April 24, 2000

 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):

-version libpng-1.0.5a October 23, 1999
-  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.
-  Created separate write_end_info_struct in pngtest.c for a more severe test.
-  Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
-version libpng-1.0.5b November 23, 1999
-  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 and added makevms.com to contrib/gregbook
-    and contrib/pngminus (Martin Zinser)
-version libpng-1.0.5c November 26, 1999
-  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 pngtypes.h.  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 (although none are used in libpng itself) when
-    PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
-  Removed some extraneous "-I" from contrib/pngminus/makefile.std
-  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
-version libpng-1.0.5d November 29, 1999
-  Add type cast (png_const_charp) two places in png.c
-  Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
-  Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
-    to applications a macro "PNG_USE_LOCAL_ARRAYS".
-  #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
-  Added PNG_EXPORT_VAR macro to accommodate making DLL's.
-version libpng-1.0.5e November 30, 1999
-  Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
-    structure; refactored the inflate/deflate support to make adding new chunks
-    with trailing compressed parts easier in the future, and added new functions
-    png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
-    png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
-  NOTE: Applications that write text chunks MUST define png_text->lang. Before
-    calling png_set_text(). It must be set to NULL if you want to write tEXt or
-    zTXt chunks.  If you want your application to be able to run with older
-    versions of libpng, use
-
-     #ifdef PNG_iTXt_SUPPORTED
-        png_text[i].lang = NULL;
-     #endif
-
-  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.
-version libpng-1.0.5f December 6, 1999
-  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 sCAL chunk support (Eric S. Raymond).
-version libpng-1.0.5g December 7, 1999
-  Fixed "png_free_spallettes" typo in png.h
-  Added code to handle new chunks in pngpread.c
-  Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
-  Added "translated_key" to png_text structure and png_write_iTXt().
-  Added code in pngwrite.c to work around a newly discovered zlib bug.
-version 1.0.5h [December 10, 1999]
-  NOTE: regarding the not for version 1.0.5e, the following must also
-    be included in your code:
-        png_text[i].translated_key = NULL;
-  Unknown chunk handling is now supported.
-  Option to eliminate all floating point support was added.  Some new
-    fixed-point functions such as png_set_gAMA_fixed() were added.
+version 1.0.6d [April 8, 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().
+version 1.0.6e [April 9, 2000]
+  Added png_data_freer() function.
+  In the code that checks for over-length tRNS chunks, added check of
+    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
+  Minor revisions of libpng.txt/libpng.3.
+  Check for existing data and free it if the free_me flag is set, in png_set_*()
+    and png_handle_*().
+  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
+    is defined.
+  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
+    and mentioned the purposes of the two macros in libpng.txt/libpng.3.
+version 1.0.6f [April 14, 2000]
+  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
+  Add checks in png_set_text() for NULL members of the input text structure.
+  Revised libpng.txt/libpng.3.
+  Removed superfluous prototype for png_set_itxt from png.h
+  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
+  Changed several png_errors about malformed ancillary chunks to png_warnings.
+version 1.0.6h [April 24, 2000]
+  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
+  Relocated paragraph about png_set_background() in libpng.3/libpng.txt
+    and other revisions (Matthias Benckmann)
+  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
+    png_ptr members to restore binary compatibility with libpng-1.0.5
+    (breaks compatibility with libpng-1.0.6).

 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
--- a/158
+++ b/158
@@ -123,6 +123,7 @@ version 0.90 [January, 1997]
     - all chunk handling routines have the same prototypes, so we will
       be able to handle all chunks via a callback mechanism
  try to fix Linux "setjmp" buffer size problems
+  removed png_large_malloc, png_large_free, and png_realloc functions.
 version 0.95 [March, 1997]
  fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
  fixed bug in PNG file signature compares when start != 0
@@ -259,6 +260,7 @@ version 0.99h [March 6, 1998, evening]
  Minor changes to previous minor changes to pngtest.c
  Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
  and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+  Added user transform capability
 version 1.00 [March 7, 1998]
  Changed several typedefs in pngrutil.c
  Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
@@ -517,7 +519,7 @@ version 1.0.5e [November 30, 1999]
    with trailing compressed parts easier in the future, and added new functions
    png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
    png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
-  NOTE: Applications that write text chunks MUST define png_text->lang and
+  NOTE: Applications that write text chunks MUST define png_text->lang
    before calling png_set_text(). It must be set to NULL if you want to
    write tEXt or zTXt chunks.  If you want your application to be able to
    run with older versions of libpng, use
@@ -544,9 +546,161 @@ version 1.0.5g [December 7, 1999]
  Added "translated_key" to png_text structure and png_write_iTXt().
  Added code in pngwrite.c to work around a newly discovered zlib bug.
 version 1.0.5h [December 10, 1999]
-  NOTE: regarding the not for version 1.0.5e, the following must also
+  NOTE: regarding the note for version 1.0.5e, the following must also
    be included in your code:
        png_text[i].translated_key = NULL;
  Unknown chunk handling is now supported.
  Option to eliminate all floating point support was added.  Some new
    fixed-point functions such as png_set_gAMA_fixed() were added.
+  Expanded tabs and removed trailing blanks in source files.
+version 1.0.5i [December 13, 1999]
+  Added some type casts to silence compiler warnings.
+  Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
+  Removed leading blanks from a #define in pngvcrd.c
+  Added some parameters to the new png_set_keep_unknown_chunks() function.
+  Added a test for up->location != 0 in the first instance of writing
+    unknown chunks in pngwrite.c
+  Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
+    prevent recursion.
+  Added png_free_hIST() function.
+  Various patches to fix bugs in the sCAL and integer cHRM processing,
+    and to add some convenience macros for use with sCAL.
+version 1.0.5j [December 21, 1999]
+  Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
+    around buggy compilers.
+  Added new type "png_fixed_point" for integers that hold float*100000 values
+  Restored backward compatibility of tEXt/zTXt chunk processing:
+    Restored the first four members of png_text to the same order as v.1.0.5d.
+    Added members "lang_key" and "itxt_length" to png_text struct.  Set
+    text_length=0 when "text" contains iTXt data.  Use the "compression"
+    member to distinguish among tEXt/zTXt/iTXt types.  Added
+    PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
+    The "Note" above, about backward incompatibility of libpng-1.0.5e, no
+    longer applies.
+  Fixed png_read|write_iTXt() to read|write parameters in the right order,
+    and to write the iTXt chunk after IDAT if it appears in the end_ptr.
+  Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
+  Reversed the order of trying to write floating-point and fixed-point gAMA.
+version 1.0.5k [December 27, 1999]
+  Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
+  Added png_handle_as_unknown() function (Glenn)
+  Added png_free_chunk_list() function and chunk_list and num_chunk_list members
+    of png_ptr.
+  Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
+  Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
+    about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
+  Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
+  Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
+  Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
+version 1.0.5l [January 1, 2000]
+  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).
+version 1.0.5m [January 7, 2000]
+  Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
+version 1.0.5n [January 9, 2000]
+  Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
+    own memory for info_ptr->palette.  This makes it safe for the calling
+    application to free its copy of the palette any time after it calls
+    png_set_PLTE().
+version 1.0.5o [January 20, 2000]
+  Cosmetic changes only (removed some trailing blanks and TABs)
+version 1.0.5p [January 31, 2000]
+  Renamed pngdll.mak to makefile.bd32
+  Cosmetic changes in pngtest.c
+version 1.0.5q [February 5, 2000]
+  Relocated the makefile.solaris warning about PATH problems.
+  Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
+  Revised makefile.gcmmx
+  Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
+version 1.0.5r [February 7, 2000]
+  Removed superfluous prototype for png_get_itxt from png.h
+  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.
+version 1.0.5s [February 18, 2000]
+  Added "png_jmp_env()" macro 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 a bug in png_read_png() that caused it to fail to expand some images
+    that it should have expanded.
+  Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
+    in pngget.c
+  Changed the allocation of palette, history, and trans arrays back to
+    the version 1.0.5 method (linking instead of copying) which restores
+    backward compatibility with version 1.0.5.  Added some remarks about
+    that in example.c.  Added "free_me" member to info_ptr and png_ptr
+    and added png_free_data() function.
+  Updated makefile.linux and makefile.gccmmx to make directories conditionally.
+  Made cosmetic changes to pngasmrd.h
+  Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
+  Modified png_read_png() to allocate info_ptr->row_pointers only if it
+    hasn't already been allocated.
+version 1.0.5t [March 4, 2000]
+  Changed png_jmp_env() migration aiding macro to png_jmpbuf().
+  Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
+  Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
+    PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
+  Files in contrib/gregbook were revised to use png_jmpbuf() and to select
+    a 24-bit visual if one is available, and to allow abbreviated options.
+  Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
+  Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
+version 1.0.5u [March 5, 2000]
+  Simplified the code that detects old png.h in png.c and pngtest.c
+  Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
+  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)
+version 1.0.5v [March 11, 2000]
+  Added some parentheses to the png_jmpbuf macro definition.
+  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().
+  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 20, 2000]
+  Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
+  Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6d [April 7, 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().
+version 1.0.6e [April 9, 2000]
+  Added png_data_freer() function.
+  In the code that checks for over-length tRNS chunks, added check of
+    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
+  Minor revisions of libpng.txt/libpng.3.
+  Check for existing data and free it if the free_me flag is set, in png_set_*()
+    and png_handle_*().
+  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
+    is defined.
+  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
+    and mentioned the purposes of the two macros in libpng.txt/libpng.3.
+version 1.0.6f [April 14, 2000]
+  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
+  Add checks in png_set_text() for NULL members of the input text structure.
+  Revised libpng.txt/libpng.3.
+  Removed superfluous prototype for png_set_itxt from png.h
+  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
+  Changed several png_errors about malformed ancillary chunks to png_warnings.
+version 1.0.6g [April 24, 2000]
+  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
+  Relocated paragraph about png_set_background() in libpng.3/libpng.txt
+    and other revisions (Matthias Benckmann)
+  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
+    png_ptr members to restore binary compatibility with libpng-1.0.5
+    (breaks compatibility with libpng-1.0.6).
+version 1.0.6h [April 24, 2000]
+  Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
+    libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
+
+Send comments/corrections/commendations to
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
+
+Glenn R-P
--- a/40
+++ b/40
@@ -1,5 +1,5 @@

-Installing libpng version 1.0.5h - December 10, 1999
+Installing libpng version 1.0.6h - April 24, 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-1.0.5h" or "lpng103" and "zlib-1.1.3"
+might be called "libpng-1.0.6h" 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:
@@ -36,23 +36,32 @@ Your directory structure should look like this:
          contrib
          etc.

-First 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.
+If the line endings in the files look funny, you may wish to get the other
+distribution of libpng.  It is available in both tar.gz (UNIX style line
+endings) and zip (DOS style line endings) formats.
+
+First 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.  
 The files that are presently available in the scripts directory
 include

- descrip.mms       =>  VMS makefile for MMS or MMK
- makefile.std      =>  Generic UNIX makefile
+ makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6h)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6h,
+                       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.dec      =>  DEC Alpha UNIX makefile
 makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
- makefile.sgi      =>  Silicon Graphics IRIX makefile
+ 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.2.1.0.6h)
 makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.5h)
- makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5h)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.6h)
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.mips     =>  MIPS makefile
 makefile.acorn    =>  Acorn makefile
@@ -61,20 +70,21 @@ include
                       (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
 makefile.atari    =>  Atari makefile
 makefile.beos     =>  BEOS makefile for X86
- makefile.borland  =>  Borland makefile
- build.bat         =>  MS-DOS batch file for Borland compiler
+ makefile.bor      =>  Borland makefile (uses bcc)
+ makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
+ makefile.bd32     =>  To make a png32bd.dll with Borland C++ 4.5
+ makefile.tc3      =>  Turbo C 3.0 makefile
 makefile.dj2      =>  DJGPP 2 makefile
 makefile.msc      =>  Microsoft C makefile
 makefile.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses
-                       assembler code)
+                       assembler code tuned for Intel MMX platform)
 makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does
                       not use assembler code)
- makefile.turboc3  =>  Turbo C 3.0 makefile
 makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
 pngos2.def        =>  OS/2 module definition file used by makefile.os2
 makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
 makevms.com       =>  VMS build script
- pngdll.mak        =>  To make a png32bd.dll with Borland C++ 4.5
+ descrip.mms       =>  VMS makefile for MMS or MMK
 pngdef.pas        =>  Defines for a png32bd.dll with Borland C++ 4.5
 SCOPTIONS.ppc     =>  Used with smakefile.ppc

--- a/91
+++ b/91
@@ -1,8 +1,61 @@

-Known bugs and suggested enhancements in libpng-1.0.5
+Known bugs and suggested enhancements in libpng-1.0.6

+1. April 23, 2000 -- BUG -- binary incompatibility

-1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
+   Libpng-1.0.6 introduced binary incompatibility for applications that
+   make direct access to the info_ptr and png_ptr, due to the insertion
+   of the free_me member ahead of some previously existing members.
+
+   STATUS:  Fixed in libpng-1.0.6g
+
+2. April 15, 2000 -- BUG -- pnggccrd.c
+
+   If PNG_NO_GLOBAL_ARRAYS is defined, pnggccrd.c will not compile.
+
+   STATUS: Fixed in libpng-1.0.6g
+
+3. April 1, 2000 -- BUG
+
+   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-1.0.6d.  The PNG_FREE_TEXT flag
+   bit in info_ptr->free_me is now checked to make sure libpng is responsible
+   for freeing the memory.
+
+4. 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-1.0.6d.
+
+5. 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-1.0.6d.
+
+6. 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-1.0.6d.  The strcpy()
+   function is used instead.
+
+7. 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 and libpng-1.0.6d by adding a
+   data_length parameter to the png_decompress_chunk() function.
+
+8. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey

   Loops need to be optimized everywhere

@@ -17,7 +70,7 @@ Known bugs and suggested enhancements in libpng-1.0.5
   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
+9. 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
@@ -29,39 +82,15 @@ Known bugs and suggested enhancements in libpng-1.0.5

   STATUS: under development.

-3. September 1999 -- ENHANCEMENT --
+10. September 1999 -- ENHANCEMENT --

   It should be possible to use libpng without floating-point aritmetic.

   STATUS: Under investigation, implementation postponed until after
-   libpng-1.0.5.  The application interface will change because replacements
+   libpng-1.0.6.  The application interface will change because replacements
   for the png_set_gAMA(), png_set_cHRM(), and corresponding png_get_()
   functions will be needed.

-4. October 1999 -- BUG
+   Much of this was completed in libpng-1.0.6, but gamma compensation
+   is not yet done in fixed-point arithmetic.

-   pngvcrd.c is failing for interlaced PNGs that have empty passes.
-
-   STATUS: A check for "width != 0" is required in several places.
-   Fixed in libpng-1.0.5a/1.1.0
-
-5. October 1999 -- BUG
-
-   Under MSVC++6.0 with debugging enabled, heap corruption was detected
-   while destroying the png_write_ptr.
-
-   STATUS:  This was fixed by modifying png_set_text (in pngset.c) to
-   refrain from writing into the user's text_ptr.  With this fix, however,
-   pngwrite.c, while destroying the info_ptr, was failing to free the
-   text->key strings.  Fix for the latter problem is to duplicate code
-   from png.c.
-
-   Fixed in libpng-1.0.5a/1.1.0
-
-6. December 1999 -- new BUG
-
-   The png_text structure was modified in libpng-1.0.5e in a manner that
-   is not backward compatible (the lang member was added, and the
-   translated_key member was added to libpng-1.0.5g)
-
-   STATUS: Will be fixed before the next public release.
--- a/8
+++ b/8
@@ -4,8 +4,8 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 (libpng versions 0.5, May 1995, through 0.89c, May 1996)
 Copyright (c) 1996, 1997 Andreas Dilger
 (libpng versions 0.90, December 1996, through 0.96, May 1997)
-Copyright (c) 1998, 1999 Glenn Randers-Pehrson
-(libpng versions 0.97, January 1998, through 1.0.5h, December 10, 1999)
+Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+(libpng versions 0.97, January 1998, through 1.0.6h, April 24, 2000)

 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:
@@ -63,9 +63,9 @@ boxes and the like:
 Also, the PNG logo (in PNG format, of course) is supplied in the
 file "pngnow.png".

-Libpng is OSI Certified Open Source Software.  OSI Certified is a
+Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
 certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-December 10, 1999
+April 24, 2000
--- a/44
+++ b/44
@@ -1,8 +1,12 @@
-README for libpng 1.0.5h - December 10, 1999 (shared library 2.1)
+README for libpng 1.0.6h - April 24, 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.

+Libpng comes in two distribution formats.  Get libpng-*.tar.gz if you
+want UNIX-style line endings in the text files, or lpng*.zip if you want
+DOS-style line endings.
+
 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
 extensive use and testing since mid-1995.  By late 1997 it had
@@ -125,22 +129,26 @@ gladly listen.  Even if your suggestion is not used for version

 Files in this distribution:

+      ANNOUNCE      =>  Announcement of this version, with recent changes
      CHANGES       =>  Description of changes between libpng versions
+      KNOWNBUG      =>  List of known bugs and deficiencies
+      LICENSE       =>  License to use and redistribute libpng
      README        =>  This file
      TODO          =>  Things not implemented in the current library
-      build.bat     =>  MS-DOS batch file for Borland compiler
-      descrip.mms   =>  VMS project file
+      Y2KINFO       =>  Statement of Y2K compliance
      example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng
+      libpng.3      =>  manual page for libpng (includes libpng.txt)
      libpng.txt    =>  Description of libpng and its functions
      libpngpf.3    =>  manual page for libpng's private functions
      png.5         =>  manual page for the PNG format
      png.c         =>  Basic interface functions common to library
      png.h         =>  Library function and interface declarations
      pngconf.h     =>  System specific library configuration
+      pngasmrd.h    =>  Header file for assembler-coded functions
      pngerror.c    =>  Error/warning message I/O functions
      pngget.c      =>  Functions for retrieving info from struct
      pngmem.c      =>  Memory handling functions
+      pngnow.png    =>  PNG logo
      pngpread.c    =>  Progressive reading functions
      pngread.c     =>  Read data/helper high-level functions
      pngrio.c      =>  Lowest-level data read I/O functions
@@ -162,18 +170,25 @@ Files in this distribution:
       pngsuite     =>  Test images
      scripts       =>  Directory containing scripts for building libpng:
       descrip.mms      =>  VMS makefile for MMS or MMK
-       makefile.std     =>  Generic UNIX makefile
+       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
+       makefile.linux   =>  Linux/ELF makefile
+                            (gcc, creates libpng.so.2.1.0.6h)
+       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                            libpng.so.2.1.0.6h, 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.dec     =>  DEC Alpha UNIX makefile
       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
-       makefile.sgi     =>  Silicon Graphics IRIX makefile
+       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.2.1.0.6h)
       makefile.sunos   =>  Sun makefile
       makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.5h)
-       makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng.so.2.1.0.5h)
+                            (gcc, creates libpng.so.2.1.0.6h)
       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
       makefile.mips    =>  MIPS makefile
       makefile.acorn   =>  Acorn makefile
@@ -183,20 +198,21 @@ Files in this distribution:
                            scripts/SCOPTIONS.ppc)
       makefile.atari   =>  Atari makefile
       makefile.beos    =>  BEOS makefile for X86
-       makefile.borland =>  Borland makefile
-       build.bat        =>  MS-DOS batch file for Borland compiler
+       makefile.bor     =>  Borland makefile (uses bcc)
+       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
+       makefile.bd32    =>  To make a png32bd.dll with Borland C++ 4.5
+       makefile.tc3     =>  Turbo C 3.0 makefile
       makefile.dj2     =>  DJGPP 2 makefile
       makefile.msc     =>  Microsoft C makefile
       makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
-                            later (uses assembler code)
+                            later (uses assembler code tuned for Intel MMX
+                            platform)
       makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
                            later (does not use assembler code)
-       makefile.turboc3 =>  Turbo C 3.0 makefile
       makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
       pngos2.def       =>  OS/2 module definition file used by makefile.os2
       makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
       makevms.com      =>  VMS build script
-       pngdll.mak       =>  To make a png32bd.dll with Borland C++ 4.5
       pngdef.pas       =>  Defines for a png32bd.dll with Borland C++ 4.5
       SCOPTIONS.ppc    =>  Used with smakefile.ppc

--- a/7
+++ b/7
@@ -1,13 +1,11 @@
 TODO - list of things to do for libpng:

 Final bug fixes.
-Fix problem with C++ and EXTERN "C".
+Finish work on the no-floating-point version (including gamma compensation)
 Better C++ wrapper/full C++ implementation?
-Keep up with public chunks.
+Fix problem with C++ and EXTERN "C".
 cHRM transformation.
-Support for application-defined chunk handlers.
 Improve setjmp/longjmp usage or remove it in favor of returning error codes.
-High-level API for reading images.
 Add "grayscale->palette" transformation and "palette->grayscale" detection.
 Improved dithering.
 Multi-lingual error and warning message support.
@@ -19,4 +17,3 @@ Better filter selection
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
 Improve API by hiding the info_ptr.
-Make a no-floating-point version.
--- a/30
+++ b/30
@@ -1,29 +1,29 @@
   Y2K compliance in libpng:
   =========================
-      
-      December 10, 1999
-      
+
+      April 24, 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 1.0.5h are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.6h are Y2K compliant.  It is my belief that earlier
      versions were also Y2K compliant.
-      
+
      Libpng only has three year fields.  One is a 2-byte unsigned integer
      that will hold years up to 65535.  The other two hold the date in text
      format, and will hold years up to 9999.
-      
+
      The integer is
          "png_uint_16 year" in png_time_struct.
-      
+
      The strings are
          "png_charp time_buffer" in png_struct and
          "near_time_buffer", which is a local character string in png.c.
-      
+
      There are seven time-related functions:

-          png_convert_to_rfc_1123() in png.c 
+          png_convert_to_rfc_1123() in png.c
            (formerly png_convert_to_rfc_1152() in error)
          png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
          png_convert_from_time_t() in pngwrite.c
@@ -31,8 +31,8 @@
          png_handle_tIME() in pngrutil.c, called in pngread.c
          png_set_tIME() in pngset.c
          png_write_tIME() in pngwutil.c, called in pngwrite.c
-      
-      All appear to handle dates properly in a Y2K environment.  The 
+
+      All appear to handle dates properly in a Y2K environment.  The
      png_convert_from_time_t() function calls gmtime() to convert from system
      clock time, which returns (year - 1900), which we properly convert to
      the full 4-digit year.  There is a possibility that applications using
@@ -42,14 +42,14 @@
      but this is not under our control.  The libpng documentation has always
      stated that it works with 4-digit years, and the APIs have been
      documented as such.
-      
+
      The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
      integer to hold the year, and can hold years as large as 65535.

      zlib, upon which libpng depends, is also Y2K compliant.  It contains
      no date-related code.
-      
-      
+
+
         Glenn Randers-Pehrson
         libpng maintainer
         PNG Development Group
--- a/6
+++ b/6
@@ -0,0 +1,6 @@
+echo "
+  There is no \"configure\" script for Libpng-1.0.6h.  Instead, please
+  copy the appropriate makefile for your system from the \"scripts\"
+  directory.  Read the INSTALL file for more details.
+"
+
--- a/contrib/gregbook/LICENSE
+++ b/contrib/gregbook/LICENSE
@@ -0,0 +1,26 @@
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+  ---------------------------------------------------------------------------
--- a/contrib/gregbook/Makefile.unx
+++ b/contrib/gregbook/Makefile.unx
@@ -1,6 +1,6 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  16 February 1999
+# Last modified:  28 February 2000
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
@@ -9,11 +9,12 @@
 #
 # Invoke this makefile from a shell prompt in the usual way; for example:
 #
-#	make -f makefile.unx
+#	make -f Makefile.unx
 #
 # This makefile assumes libpng and zlib have already been built or downloaded
 # and are both installed in /usr/local/{include,lib} (as indicated by the
-# PNGPATH and ZPATH macros below).  Edit as appropriate.
+# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIB, ZINC and ZLIB lines.
 #
 # This makefile builds statically linked executables (against libpng and zlib,
 # that is), but that can be changed by uncommenting the appropriate PNGLIB and
@@ -22,30 +23,38 @@

 # macros --------------------------------------------------------------------

-PNGPATH = /usr/local
-PNGINC = -I$(PNGPATH)/include
-#PNGLIB = -L$(PNGPATH)/lib -lpng
-PNGLIB = $(PNGPATH)/lib/libpng.a
+PNGINC = -I/usr/local/include
+#PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
+PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+# or:
+#PNGINC = -I../..
+#PNGLIB = -L../.. -lpng
+#PNGLIB = ../../libpng.a

-ZPATH = /usr/local
-ZINC = -I$(ZPATH)/include
-#ZLIB = -L$(ZPATH)/lib -lz
-ZLIB = $(ZPATH)/lib/libz.a
+ZINC = -I/usr/local/include
+#ZLIB = -L/usr/local/lib -lz		# dynamically linked against zlib
+ZLIB = /usr/local/lib/libz.a		# statically linked against zlib
+#ZINC = -I../zlib
+#ZLIB = -L../zlib -lz
+#ZLIB = ../../../zlib/libz.a

-#XPATH = /usr/X11
-XPATH = /usr/X11R6
-XINC = -I$(XPATH)/include
-XLIB = -L$(XPATH)/lib -lX11
+#XINC = -I/usr/include/X11		# old-style, stock X distributions
+#XLIB = -L/usr/lib/X11 -lX11
+#XINC = -I/usr/openwin/include/X11	# Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
+XLIB = -L/usr/X11R6/lib -lX11

 INCS = $(PNGINC) $(ZINC) $(XINC)
 RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
-WLIBS = $(PNGLIB) $(ZLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)

 CC = gcc
 LD = gcc
 RM = rm -f
 CFLAGS = -O -Wall $(INCS)
-# [note that -Wall is a gcc-specific compilation flag ("all warnings on")]
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+# [-ansi, -pedantic and -W can also be used]
 LDFLAGS =
 O = .o
 E =
--- a/contrib/gregbook/Makefile.w32
+++ b/contrib/gregbook/Makefile.w32
@@ -10,14 +10,14 @@
 # Invoke this makefile from a DOS prompt window via:
 #
 #	%devstudio%\vc\bin\vcvars32.bat
-#	nmake -nologo -f makefile.w32
+#	nmake -nologo -f Makefile.w32
 #
 # where %devstudio% is the installation directory for MSVC / DevStudio.  If
 # you get "environment out of space" errors, create a desktop shortcut with
 # "c:\windows\command.com /e:4096" as the program command line and set the
 # working directory to this directory.  Then double-click to open the new
 # DOS-prompt window with a bigger environment and retry the commands above.
-#
+# 
 # This makefile assumes libpng and zlib have already been built or downloaded
 # and are in subdirectories at the same level as the current subdirectory
 # (as indicated by the PNGPATH and ZPATH macros below).  Edit as appropriate.
@@ -32,12 +32,12 @@

 # macros --------------------------------------------------------------------

-PNGPATH = ../libpng
+PNGPATH = ../..
 PNGINC = -I$(PNGPATH)
 #PNGLIB = $(PNGPATH)/pngdll.lib
 PNGLIB = $(PNGPATH)/libpng.lib

-ZPATH = ../zlib
+ZPATH = ../../../zlib
 ZINC = -I$(ZPATH)
 #ZLIB = $(ZPATH)/zlibdll.lib
 ZLIB = $(ZPATH)/zlibstat.lib
--- a/contrib/gregbook/README
+++ b/contrib/gregbook/README
@@ -1,52 +1,183 @@
-PNG: The Definitive Guide: Source Code
+                     ===========================
+                      PNG: The Definitive Guide
+                     ===========================

-Chapters 13, 14 and 15 of PNG: The Definitive Guide discuss three
+                             Source Code
+
+Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
 cross-platform demo programs that show how to use the libpng reference
-library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is a
-very simple example that that shows how a standard file-viewer might use
-libpng, while the second is designed to process streaming data and shows how
-a web browser might be written. wpng is a simple command-line program that
-reads binary PPM files (the ``raw'' RGB subset of NetPBM) and converts them
-to PNG.
+library:  rpng, rpng2 and wpng.  rpng and rpng2 are viewers; the first is
+a very simple example that that shows how a standard file-viewer might use
+libpng, while the second is designed to process streaming data and shows
+how a web browser might be written.  wpng is a simple command-line program
+that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
+of PBMPLUS/NetPBM) and converts them to PNG.

-The source code for all three demo programs currently compiles only under
-Unix and 32-bit Windows. It has been tested with gcc 2.7.2.3 under Linux and
-Solaris and with Microsoft Visual C++ 5.0 under Windows 95. Brief
-instructions for compiling the programs are included at the top of the
-makefiles; makefile.unx is the Unix version, and makefile.w32 is (you
-guessed it!) the version for 32-bit Windows. libpng and zlib are required.
+The source code for all three demo programs currently compiles under
+Unix, OpenVMS, and 32-bit Windows.  (Special thanks to Martin Zinser,
+zinser@decus.de, for making the necessary changes for OpenVMS and for
+providing an appropriate build script.)  Build instructions can be
+found below.

----------------------------------------------------------------------------
+Files:

-License
+   README             this file
+   README.w32         additional Windows-specific information
+   LICENSE            terms of distribution and reuse (BSD-like)

-The source code to the demo programs may be used and distributed freely
-(even if you didn't buy the book--but feel free to do so at any time),
-subject to the terms of the following BSD-like license:
+   Makefile.unx       Unix makefile
+   Makefile.w32       Windows (MSVC) makefile
+   makevms.com        OpenVMS build script

-     Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
+   rpng-win.c         Windows front end for the basic viewer
+   rpng-x.c           X Window System (Unix, OpenVMS) front end
+   readpng.c          generic back end for the basic viewer
+   readpng.h          header file for the basic viewer

-     This software is provided "as is," without warranty of any kind,
-     express or implied. In no event shall the author or contributors
-     be held liable for any damages arising in any way from the use of
-     this software.
+   rpng2-win.c        Windows front end for the progressive viewer
+   rpng2-x.c          X front end for the progressive viewer
+   readpng2.c         generic back end for the progressive viewer
+   readpng2.h         header file for the progressive viewer

-     Permission is granted to anyone to use this software for any
-     purpose, including commercial applications, and to alter it and
-     redistribute it freely, subject to the following restrictions:
+   wpng.c             generic (text) front end for the converter
+   writepng.c         generic back end for the converter
+   writepng.h         header file for the converter

-       1. Redistributions of source code must retain the above
-          copyright notice, disclaimer, and this list of conditions.
-       2. Redistributions in binary form must reproduce the above
-          copyright notice, disclaimer, and this list of conditions in
-          the documentation and/or other materials provided with the
-          distribution.
-       3. All advertising materials mentioning features or use of this
-          software must display the following acknowledgment:
+   toucan.png         transparent PNG for testing (by Stefan Schneider)

-               This product includes software developed by Greg Roelofs
-               and contributors for the book, "PNG: The Definitive
-               Guide," published by O'Reilly and Associates.
+Note that the programs are designed to be functional, but their primary
+purpose is to demonstrate how to use libpng to add PNG support to other
+programs.  As such, their user interfaces are crude and definitely not
+intended for everyday use.

----------------------------------------------------------
-http://www.cdrom.com/pub/png/book/sources.html
+Please see http://www.cdrom.com/pub/png/pngbook.html for further infor-
+mation and links to the latest version of the source code, and Chapters
+13-15 of the book for detailed discussion of the three programs.
+
+Greg Roelofs
+19 March 2000
+
+
+BUILD INSTRUCTIONS
+
+ - Prerequisites:
+
+      - zlib		ftp://ftp.cdrom.com/pub/infozip/zlib/zlib.html
+      - libpng		http://www.cdrom.com/pub/png/pngcode.html
+      - pngbook		http://www.cdrom.com/pub/png/book/sources.html
+
+     The pngbook demo programs are explicitly designed to demonstrate proper
+     coding techniques for using the libpng reference library.  As a result,
+     you need to download and build both zlib (on which libpng depends) and
+     libpng.  A common build setup is to place the zlib, libpng and pngbook
+     subdirectory trees ("folders") in the same parent directory.  Then the
+     libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
+     and similarly for the pngbook build.
+
+     Note that all three packages are designed to be built from a command
+     line by default; those who wish to use a graphical or other integrated
+     development environments are on their own.
+
+
+ - Unix:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a directory and change into that directory.
+
+     Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
+     appropriately (possibly also the X* variables if necessary).
+
+     make
+
+     There is no "install" target, so copy the three executables somewhere
+     in your path or run them from the current directory.  All three will
+     print a basic usage screen when run without any command-line arguments;
+     see the book for more details.
+
+
+ - Windows:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a folder, open a "DOS shell" or "command prompt"
+     or equivalent command-line window, and cd into the folder where you
+     unpacked the source code.
+
+     For MSVC, set up the necessary environment variables by invoking
+ 
+        %devstudio%\vc\bin\vcvars32.bat
+
+     where where %devstudio% is the installation directory for MSVC /
+     DevStudio.  If you get "environment out of space" errors under 95/98,
+     create a desktop shortcut with "c:\windows\command.com /e:4096" as
+     the program command line and set the working directory to the pngbook
+     directory.  Then double-click to open the new DOS-prompt window with
+     a bigger environment and retry the commands above.
+
+     Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
+     appropriately (possibly also the "INC" and "LIB" variables if needed).
+     Note that the names of the dynamic and static libpng and zlib libraries
+     used in the makefile may change in later releases of the libraries.
+     Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
+     This makefile therefore builds statically linked executables, but if
+     the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
+     and ZLIB lines will build dynamically linked executables instead.
+
+     Do the build by typing
+
+        nmake
+
+     The result should be three executables:  rpng-win.exe, rpng2-win.exe,
+     and wpng.exe.  Copy them somewhere in your PATH or run them from the
+     current folder.  Unlike the Unix versions, the two windowed programs
+     (rpng and rpng2) do not display a usage screen when invoked without
+     command-line arguments; see README.w32 for brief help or the book for
+     details.  Note that the programs use the Unix-style "-" character to
+     specify options, instead of the more common DOS/Windows "/" character.
+
+
+ - OpenVMS:
+
+     Unpack the pngbook sources into a subdirectory and change into that
+     subdirectory.
+
+     Edit makevms.com appropriately, specifically the zpath and pngpath
+     variables.
+
+     @makevms
+
+     To run the programs, they probably first need to be set up as "foreign
+     symbols," with "disk" and "dir" set appropriately:
+
+     $ rpng == "$disk:[dir]rpng-x.exe"
+     $ rpng2 == "$disk:[dir]rpng2-x.exe"
+     $ wpng == "$disk:[dir]wpng.exe"
+
+     All three will print a basic usage screen when run without any command-
+     line arguments; see the book for more details.  Note that the options
+     style is Unix-like, i.e., preceded by "-" rather than "/".
+
+
+RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
+
+     rpng is a simple PNG viewer that can display transparent PNGs with a
+     specified background color; for example,
+
+	rpng -bgcolor #ff0000 toucan.png
+
+     would display the image with a red background.  rpng2 is a progressive
+     viewer that simulates a web browser in some respects; it can display
+     images against either a background color or a dynamically generated
+     background image.  For example:
+
+	rpng2 -bgpat 16 toucan.png
+
+     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
+     format (.pgm or .ppm) to PNG; for example,
+
+	wpng -time < toucan.ppm > toucan.png
+
+     would convert the specified PPM file (using redirection) to PNG, auto-
+     matically setting the PNG modification-time chunk.
+
+     All options can be abbreviated to the shortest unique value; for example,
+     "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.
--- a/contrib/gregbook/README.w32
+++ b/contrib/gregbook/README.w32
@@ -0,0 +1,53 @@
+See the main README file for basic instructions on compiling and running
+the programs.  See http://www.cdrom.com/pub/png/pngbook.html for further
+information and links to the source code, and Chapters 13-15 of the book
+for detailed discussion of the three programs.
+
+Since the two viewers, rpng and rpng2, are both designed to write infor-
+mation to the console (i.e., a DOS-window command line) while displaying
+the image in a graphical window--and since I haven't yet figured out how
+to do that under Windows--here are the usage screens for the two programs:
+
+
+rpng-win 1.02 of 19 March 2000:  Simple PNG Viewer for Windows
+   Compiled with libpng 1.0.5; using libpng 1.0.5.
+   Compiled with zlib 1.1.3; using zlib 1.1.3.
+
+Usage:  rpng-win [-gamma exp] [-bgcolor bg] file.png
+    exp 	transfer-function exponent (``gamma'') of the display
+		  system in floating-point format (e.g., ``2.2''); equal
+		  to the product of the lookup-table exponent (varies)
+		  and the CRT exponent (usually 2.2); must be positive
+    bg  	desired background color in 7-character hex RGB format
+		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
+		  used with transparent images
+
+Press Q, Esc or mouse button 1 after image is displayed to quit.
+
+
+rpng2-win 1.04 of 19 March 2000:  Progressive PNG Viewer for Windows
+   Compiled with libpng 1.0.5; using libpng 1.0.5.
+   Compiled with zlib 1.1.3; using zlib 1.1.3.
+
+Usage:  rpng2-win [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing] file.png
+
+    exp 	transfer-function exponent (``gamma'') of the display
+		  system in floating-point format (e.g., ``2.2''); equal
+		  to the product of the lookup-table exponent (varies)
+		  and the CRT exponent (usually 2.2); must be positive
+    bg  	desired background color in 7-character hex RGB format
+		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
+		  used with transparent images; overrides -bgpat
+    pat 	desired background pattern number (1-16); used with
+		  transparent images; overrides -bgcolor
+    -timing	enables delay for every block read, to simulate modem
+		  download of image (~36 Kbps)
+
+Press Q, Esc or mouse button 1 after image is displayed to quit.
+
+
+The usage screen for the third (non-windowed) program, wpng, can be seen
+simply by invoking it without any parameters (``wpng'').
+
+Greg Roelofs
+19 March 2000
--- a/contrib/gregbook/makevms.com
+++ b/contrib/gregbook/makevms.com
@@ -1,11 +1,22 @@
 $!------------------------------------------------------------------------------
-$! make Contrib programs of libpng under OpenVMS
+$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS
+$!
+$! Script created by Martin Zinser for libpng; modified by Greg Roelofs
+$! for standalone pngbook source distribution.
 $!
 $!
-$! Look for the compiler used
+$!    Set locations where zlib and libpng sources live.
 $!
-$ zlibsrc = "[---.zlib]"
-$ ccopt="/include=(''zlibsrc',[--])"
+$ zpath = "[-.zlib]"
+$ pngpath = "[-.libpng]"
+$!
+$! USE THESE INSTEAD if building from libpng's [.contrib.gregbook] directory:
+$! zpath = "[---.zlib]"
+$! pngpath = "[--]"
+$!
+$!    Look for the compiler used.
+$!
+$ ccopt="/include=(''zpath',''pngpath')"
 $ if f$getsyi("HW_MODEL").ge.1024
 $ then
 $  ccopt = "/prefix=all"+ccopt
@@ -29,13 +40,16 @@ $    comp  = "__decc__=1"
 $  endif
 $ endif
 $ open/write lopt lib.opt
-$ write lopt "[--]libpng.olb/lib"
-$ write lopt "''zlibsrc'libz.olb/lib"
+$ write lopt "''pngpath'libpng.olb/lib"
+$ write lopt "''zpath'libz.olb/lib"
 $ close lopt
 $ open/write xopt x11.opt
 $ write xopt "sys$library:decw$xlibshr.exe/share"
 $ close xopt
-$ write sys$output "Compiling PNG contrib programs ..."
+$!
+$!    Build 'em.
+$!
+$ write sys$output "Compiling PNG book programs ..."
 $   CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -
 	readpng.c readpng.h
 $   CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -
--- a/contrib/gregbook/readpng.c
+++ b/contrib/gregbook/readpng.c
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -32,8 +32,13 @@
 #include <stdio.h>
 #include <stdlib.h>

-#include "png.h"      /* libpng header; includes zlib.h */
-#include "readpng.h"  /* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h */
+#include "readpng.h"    /* typedefs, common macros, public prototypes */
+
+/* future versions of libpng will provide this macro: */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
+#endif


 static png_structp png_ptr = NULL;
@@ -44,7 +49,7 @@ int  bit_depth, color_type;
 uch  *image_data = NULL;


-void readpng_version_info()
+void readpng_version_info(void)
 {
    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
      PNG_LIBPNG_VER_STRING, png_libpng_ver);
@@ -55,7 +60,7 @@ void readpng_version_info()

 /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */

-int readpng_init(FILE *infile, long *pWidth, long *pHeight)
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 {
    uch sig[8];

@@ -89,7 +94,7 @@ int readpng_init(FILE *infile, long *pWidth, long *pHeight)
    /* setjmp() must be called in every function that calls a PNG-reading
     * libpng function */

-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
        return 2;
    }
@@ -130,7 +135,7 @@ int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
    /* setjmp() must be called in every function that calls a PNG-reading
     * libpng function */

-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
        return 2;
    }
@@ -184,7 +189,7 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
    /* setjmp() must be called in every function that calls a PNG-reading
     * libpng function */

-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
        return NULL;
    }
--- a/contrib/gregbook/readpng.h
+++ b/contrib/gregbook/readpng.h
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -54,7 +54,7 @@ typedef unsigned long   ulg;

 void readpng_version_info(void);

-int readpng_init(FILE *infile, long *pWidth, long *pHeight);
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);

 int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);

--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -30,10 +30,10 @@
  ---------------------------------------------------------------------------*/


-#include <stdlib.h>    /* for exit() prototype */
+#include <stdlib.h>     /* for exit() prototype */

-#include "png.h"       /* libpng header; includes zlib.h and setjmp.h */
-#include "readpng2.h"  /* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include "readpng2.h"   /* typedefs, common macros, public prototypes */


 /* local prototypes */
@@ -47,7 +47,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);



-void readpng2_version_info()
+void readpng2_version_info(void)
 {
    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
      PNG_LIBPNG_VER_STRING, png_libpng_ver);
@@ -70,7 +70,7 @@ int readpng2_check_sig(uch *sig, int num)

 int readpng2_init(mainprog_info *mainprog_ptr)
 {
-    png_structp  png_ptr; /* note:  temporary variables! */
+    png_structp  png_ptr;       /* note:  temporary variables! */
    png_infop  info_ptr;


@@ -176,7 +176,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)

    mainprog_ptr = png_get_progressive_ptr(png_ptr);

-    if (mainprog_ptr == NULL) { /* we be hosed */
+    if (mainprog_ptr == NULL) {         /* we be hosed */
        fprintf(stderr,
          "readpng2 error:  main struct not recoverable in info_callback.\n");
        fflush(stderr);
@@ -283,7 +283,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)

    png_read_update_info(png_ptr, info_ptr);

-    mainprog_ptr->rowbytes = png_get_rowbytes(png_ptr, info_ptr);
+    mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);
    mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);


@@ -323,6 +323,11 @@ static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
    mainprog_ptr = png_get_progressive_ptr(png_ptr);


+    /* save the pass number for optional use by the front end */
+
+    mainprog_ptr->pass = pass;
+
+
    /* have libpng either combine the new row data with the existing row data
     * from previous passes (if interlaced) or else just copy the new row
     * into the main program's image buffer */
@@ -408,7 +413,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
    fflush(stderr);

    mainprog_ptr = png_get_error_ptr(png_ptr);
-    if (mainprog_ptr == NULL) { /* we are completely hosed now */
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
        fprintf(stderr,
          "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");
        fflush(stderr);
--- a/contrib/gregbook/readpng2.h
+++ b/contrib/gregbook/readpng2.h
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -61,7 +61,8 @@ typedef struct _mainprog_info {
    uch *image_data;
    uch **row_pointers;
    jmp_buf jmpbuf;
-    int passes;    /* not used */
+    int passes;              /* not used */
+    int pass;
    int rowbytes;
    int channels;
    int need_bgcolor;
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -16,7 +16,16 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.00:  initial public release
+    - 1.01:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -43,7 +52,7 @@

 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "1.0 of 20 February 1999"
+#define VERSION   "1.02 of 19 March 2000"

 #include <stdio.h>
 #include <stdlib.h>
@@ -53,7 +62,7 @@

 /* #define DEBUG  :  this enables the Trace() macros */

-#include "readpng.h" /* typedefs, common macros, readpng prototypes */
+#include "readpng.h"    /* typedefs, common macros, readpng prototypes */


 /* could just include png.h, but this macro is the only thing we need
@@ -61,10 +70,10 @@
 * only happen with alpha (which could easily be avoided with
 * "ush acopy = (alpha);") */

-#define alpha_composite(composite, fg, alpha, bg) {              \
-    ush temp = ((ush)(fg)*(ush)(alpha) +                         \
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);              \
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }


@@ -78,7 +87,7 @@ LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;    /* GRR:  not (yet) used */
+static char *icon_name = PROGNAME;     /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;

@@ -104,15 +113,15 @@ static HWND global_hwnd;

 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
 {
-    char *args[1024];                /* arbitrary limit, but should suffice */
+    char *args[1024];                 /* arbitrary limit, but should suffice */
    char *p, *q, **argv = args;
    int argc = 0;
    int rc, alen, flen;
    int error = 0;
    int have_bg = FALSE;
-    double LUT_exponent;             /* just the lookup table */
-    double CRT_exponent = 2.2;       /* just the monitor */
-    double default_display_exponent; /* whole display system */
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
    MSG msg;


@@ -199,20 +208,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* Now parse the command line for options and the PNG filename. */

    while (*++argv && !error) {
-        if (!strcmp(*argv, "-gamma")) {
+        if (!strncmp(*argv, "-gamma", 2)) {
            if (!*++argv)
                ++error;
-            display_exponent = atof(*argv);
-            if (display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
            if (!*++argv)
                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
-            else
-                have_bg = TRUE;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else
+                    have_bg = TRUE;
+            }
        } else {
            if (**argv != '-') {
                filename = *argv;
@@ -255,6 +268,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            fclose(infile);
    }

+
+    /* usage screen */
+
    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        readpng_version_info();
@@ -265,7 +281,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
         "\t\t  to the product of the lookup-table exponent (varies)\n"
         "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
         "    bg  \tdesired background color in 7-character hex RGB format\n"
-         "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
+         "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
         "\t\t  used with transparent images\n"
         "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
         "\n", PROGNAME, default_display_exponent);
@@ -336,6 +352,10 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)

    /* wait for the user to tell us when to quit */

+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
@@ -371,7 +391,7 @@ static int rpng_win_create_window(HINSTANCE hInst, int showmode)
    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
                              wimage_rowbytes*image_height)))
    {
-        return 4; /* fail */
+        return 4;   /* fail */
    }

 /*---------------------------------------------------------------------------
@@ -477,7 +497,7 @@ static int rpng_win_display_image()
                g = *src++;
                b = *src++;
                *dest++ = b;
-                *dest++ = g; /* note reverse order */
+                *dest++ = g;   /* note reverse order */
                *dest++ = r;
            }
        } else /* if (image_channels == 4) */ {
@@ -582,15 +602,15 @@ LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)

        /* wait for the user to tell us when to quit */
        case WM_CHAR:
-            switch (wP) { /* only need one, so ignore repeat count */
+            switch (wP) {      /* only need one, so ignore repeat count */
                case 'q':
                case 'Q':
-                case 0x1B: /* Esc key */
+                case 0x1B:     /* Esc key */
                    PostQuitMessage(0);
            }
            return 0;

-        case WM_LBUTTONDOWN: /* another way of quitting */
+        case WM_LBUTTONDOWN:   /* another way of quitting */
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
--- a/contrib/gregbook/rpng-x.c
+++ b/contrib/gregbook/rpng-x.c
@@ -5,8 +5,8 @@
   This program decodes and displays PNG images, with gamma correction and
   optionally with a user-specified background color (in case the image has
   transparency).  It is very nearly the most basic PNG viewer possible.
-   This version is for the X Window System (tested under Unix, but may work
-   under VMS or OS/2 with a little tweaking).
+   This version is for the X Window System (tested by author under Unix and
+   by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).

   to do:
    - 8-bit support
@@ -14,7 +14,17 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -41,7 +51,7 @@

 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.11 of 19 March 2000"

 #include <stdio.h>
 #include <stdlib.h>
@@ -54,7 +64,7 @@

 /* #define DEBUG  :  this enables the Trace() macros */

-#include "readpng.h" /* typedefs, common macros, readpng prototypes */
+#include "readpng.h"   /* typedefs, common macros, readpng prototypes */


 /* could just include png.h, but this macro is the only thing we need
@@ -95,15 +105,16 @@ static uch *image_data;
 static char *displayname;
 static XImage *ximage;
 static Display *display;
-static int bitmap_order;
 static int depth;
 static Visual *visual;
-static int RPixelShift, GPixelShift, BPixelShift;
-static ulg RedMask, GreenMask, BlueMask;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
 static Window window;
 static GC gc;
 static Colormap colormap;

+static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;
 /*
@@ -123,9 +134,9 @@ int main(int argc, char **argv)
    int rc, alen, flen;
    int error = 0;
    int have_bg = FALSE;
-    double LUT_exponent;             /* just the lookup table */
-    double CRT_exponent = 2.2;       /* just the monitor */
-    double default_display_exponent; /* whole display system */
+    double LUT_exponent;               /* just the lookup table */
+    double CRT_exponent = 2.2;         /* just the monitor */
+    double default_display_exponent;   /* whole display system */
    XEvent e;
    KeySym k;

@@ -188,24 +199,29 @@ int main(int argc, char **argv)
    /* Now parse the command line for options and the PNG filename. */

    while (*++argv && !error) {
-        if (!strcmp(*argv, "-display")) {
+        if (!strncmp(*argv, "-display", 2)) {
            if (!*++argv)
                ++error;
-            displayname = *argv;
-        } else if (!strcmp(*argv, "-gamma")) {
-            if (!*++argv)
-                ++error;
-            display_exponent = atof(*argv);
-            if (display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
            else
-                have_bg = TRUE;
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error; 
+                else 
+                    have_bg = TRUE;
+            }
        } else {
            if (**argv != '-') {
                filename = *argv;
@@ -222,8 +238,7 @@ int main(int argc, char **argv)
        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
        ++error;
    } else {
-        if ((rc = readpng_init(infile, (long *)(&image_width),
-                               (long *)(&image_height))) != 0) {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
            switch (rc) {
                case 1:
                    fprintf(stderr, PROGNAME
@@ -257,21 +272,25 @@ int main(int argc, char **argv)
            fclose(infile);
    }

+
+    /* usage screen */
+
    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        readpng_version_info();
        fprintf(stderr, "\n"
-         "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
-         "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
-         "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-         "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-         "\t\t  to the product of the lookup-table exponent (varies)\n"
-         "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-         "    bg  \tdesired background color in 7-character hex RGB format\n"
-         "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
-         "\t\t  used with transparent images\n"
-         "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-         "\n", PROGNAME, default_display_exponent);
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME, default_display_exponent);
        exit(1);
    }

@@ -344,6 +363,10 @@ int main(int argc, char **argv)

    /* wait for the user to tell us when to quit */

+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+
    do
        XNextEvent(display, &e);
    while (!(e.type == ButtonPress && e.xbutton.button == Button1) &&
@@ -362,11 +385,13 @@ int main(int argc, char **argv)



-static int rpng_x_create_window()
+static int rpng_x_create_window(void)
 {
    uch *xdata;
+    int need_colormap = FALSE;
    int screen, pad;
    ulg bg_pixel = 0L;
+    ulg attrmask;
    Window root;
    XEvent e;
    XGCValues gcvalues;
@@ -378,11 +403,15 @@ static int rpng_x_create_window()
    XWMHints *wm_hints;


-    bitmap_order = BitmapBitOrder(display);
    screen = DefaultScreen(display);
    depth = DisplayPlanes(display, screen);
    root = RootWindow(display, screen);

+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+#if 0
 /* GRR:  add 8-bit support */
    if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
        fprintf(stderr,
@@ -394,27 +423,73 @@ static int rpng_x_create_window()
    XMatchVisualInfo(display, screen, depth,
      (depth == 8)? PseudoColor : TrueColor, &visual_info);
    visual = visual_info.visual;
+#else
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;

-    RedMask   = visual->red_mask;
-    GreenMask = visual->green_mask;
-    BlueMask  = visual->blue_mask;
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
+    }
+#endif
+
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;

 /* GRR:  add/check 8-bit support */
-    if (depth == 8) {
+    if (depth == 8 || need_colormap) {
        colormap = XCreateColormap(display, root, visual, AllocNone);
        if (!colormap) {
            fprintf(stderr, "XCreateColormap() failed\n");
            return 2;
        }
        have_colormap = TRUE;
-    } else if (depth == 16) {
-        RPixelShift = 15 - rpng_x_msb(RedMask); /* these are right-shifts */
-        GPixelShift = 15 - rpng_x_msb(GreenMask);
-        BPixelShift = 15 - rpng_x_msb(BlueMask);
-    } else /* if (depth > 16) */ {
-        RPixelShift = rpng_x_msb(RedMask) - 7; /* these are left-shifts */
-        GPixelShift = rpng_x_msb(GreenMask) - 7;
-        BPixelShift = rpng_x_msb(BlueMask) - 7;
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng_x_msb(GMask);
+        BShift = 15 - rpng_x_msb(BMask);
+    } else if (depth > 16) {
+#define NO_24BIT_MASKS
+#ifdef NO_24BIT_MASKS
+        RShift = rpng_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng_x_msb(GMask) - 7;
+        BShift = rpng_x_msb(BMask) - 7;
+#else
+        RShift = 7 - rpng_x_msb(RMask);     /* these are right-shifts, too */
+        GShift = 7 - rpng_x_msb(GMask);
+        BShift = 7 - rpng_x_msb(BMask);
+#endif
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng internal logic error:  negative X shift(s)!\n");
+        return 2;
    }

 /*---------------------------------------------------------------------------
@@ -423,9 +498,16 @@ static int rpng_x_create_window()

    attr.backing_store = Always;
    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }

-    window = XCreateWindow(display, root, 0, 0, image_width, image_height,
-      0, depth, InputOutput, visual, CWBackingStore | CWEventMask, &attr);
+    window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0,
+      depth, InputOutput, visual, attrmask, &attr);

    if (window == None) {
        fprintf(stderr, "XCreateWindow() failed\n");
@@ -446,8 +528,8 @@ static int rpng_x_create_window()
    if ((size_hints = XAllocSizeHints()) != NULL) {
        /* window will not be resizable */
        size_hints->flags = PMinSize | PMaxSize;
-        size_hints->min_width = size_hints->max_width = image_width;
-        size_hints->min_height = size_hints->max_height = image_height;
+        size_hints->min_width = size_hints->max_width = (int)image_width;
+        size_hints->min_height = size_hints->max_height = (int)image_height;
    }

    if ((wm_hints = XAllocWMHints()) != NULL) {
@@ -469,13 +551,13 @@ static int rpng_x_create_window()
  ---------------------------------------------------------------------------*/

    if (depth == 24 || depth == 32) {
-        bg_pixel = ((ulg)bg_red   << RPixelShift) |
-                   ((ulg)bg_green << GPixelShift) |
-                   ((ulg)bg_blue  << BPixelShift);
+        bg_pixel = ((ulg)bg_red   << RShift) |
+                   ((ulg)bg_green << GShift) |
+                   ((ulg)bg_blue  << BShift);
    } else if (depth == 16) {
-        bg_pixel = ((((ulg)bg_red   << 8) >> RPixelShift) & RedMask)   |
-                   ((((ulg)bg_green << 8) >> GPixelShift) & GreenMask) |
-                   ((((ulg)bg_blue  << 8) >> BPixelShift) & BlueMask);
+        bg_pixel = ((((ulg)bg_red   << 8) >> RShift) & RMask) |
+                   ((((ulg)bg_green << 8) >> GShift) & GMask) |
+                   ((((ulg)bg_blue  << 8) >> BShift) & BMask);
    } else /* depth == 8 */ {

        /* GRR:  add 8-bit support */
@@ -524,7 +606,7 @@ static int rpng_x_create_window()
        return 3;
    }

-    /* to avoid testing the bitmap_order every pixel (or doubling the size of
+    /* to avoid testing the byte order every pixel (or doubling the size of
     * the drawing routine with a giant if-test), we arbitrarily set the byte
     * order to MSBFirst and let Xlib worry about inverting things on little-
     * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most
@@ -541,20 +623,24 @@ static int rpng_x_create_window()



-static int rpng_x_display_image()
+static int rpng_x_display_image(void)
 {
    uch *src;
    char *dest;
    uch r, g, b, a;
-    int ximage_rowbytes = ximage->bytes_per_line;
    ulg i, row, lastrow = 0;
    ulg pixel;
+    int ximage_rowbytes = ximage->bytes_per_line;
+/*  int bpp = ximage->bits_per_pixel;  */


    Trace((stderr, "beginning display loop (image_channels == %d)\n",
      image_channels))
-    Trace((stderr, "(width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
+    Trace((stderr, "   (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
      image_width, image_rowbytes, ximage_rowbytes))
+    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))
+    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?
+      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))

    if (depth == 24 || depth == 32) {
        ulg red, green, blue;
@@ -567,14 +653,27 @@ static int rpng_x_display_image()
                    red   = *src++;
                    green = *src++;
                    blue  = *src++;
-                    pixel = (red   << RPixelShift) |
-                            (green << GPixelShift) |
-                            (blue  << BPixelShift);
+#ifdef NO_24BIT_MASKS
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
                    /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[3];
-                    *dest++ = ((uch *)&pixel)[2];
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#else
+                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;
+                    green = (GShift < 0)? green << (-GShift) : green >> GShift;
+                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;
+                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#endif
                }
            } else /* if (image_channels == 4) */ {
                for (i = image_width;  i > 0;  --i) {
@@ -598,20 +697,20 @@ static int rpng_x_display_image()
                        alpha_composite(green, g, a, bg_green);
                        alpha_composite(blue,  b, a, bg_blue);
                    }
-                    pixel = (red   << RPixelShift) |
-                            (green << GPixelShift) |
-                            (blue  << BPixelShift);
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
                    /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[3];
-                    *dest++ = ((uch *)&pixel)[2];
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                }
            }
            /* display after every 16 lines */
            if (((row+1) & 0xf) == 0) {
-                XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-                  image_width, 16);
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
                XFlush(display);
                lastrow = row + 1;
            }
@@ -631,12 +730,12 @@ static int rpng_x_display_image()
                    ++src;
                    blue  = ((ush)(*src) << 8);
                    ++src;
-                    pixel = ((red   >> RPixelShift) & RedMask)   |
-                            ((green >> GPixelShift) & GreenMask) |
-                            ((blue  >> BPixelShift) & BlueMask);
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
                    /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                }
            } else /* if (image_channels == 4) */ {
                for (i = image_width;  i > 0;  --i) {
@@ -663,18 +762,18 @@ static int rpng_x_display_image()
                        green = ((ush)g << 8);
                        blue  = ((ush)b << 8);
                    }
-                    pixel = ((red   >> RPixelShift) & RedMask)   |
-                            ((green >> GPixelShift) & GreenMask) |
-                            ((blue  >> BPixelShift) & BlueMask);
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
                    /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                }
            }
            /* display after every 16 lines */
            if (((row+1) & 0xf) == 0) {
-                XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-                  image_width, 16);
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
                XFlush(display);
                lastrow = row + 1;
            }
@@ -688,8 +787,8 @@ static int rpng_x_display_image()

    Trace((stderr, "calling final XPutImage()\n"))
    if (lastrow < image_height) {
-        XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-          image_width, image_height-lastrow);
+        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+          (int)lastrow, image_width, image_height-lastrow);
        XFlush(display);
    }

@@ -699,7 +798,7 @@ static int rpng_x_display_image()



-static void rpng_x_cleanup()
+static void rpng_x_cleanup(void)
 {
    if (image_data) {
        free(image_data);
@@ -722,6 +821,9 @@ static void rpng_x_cleanup()

    if (have_colormap)
        XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
 }


--- a/contrib/gregbook/rpng2-win.c
+++ b/contrib/gregbook/rpng2-win.c
@@ -22,10 +22,13 @@
   Changelog:
    - 1.01:  initial public release
    - 1.02:  fixed cut-and-paste error in usage screen (oops...)
+    - 1.03:  modified to allow abbreviated options
+    - 1.04:  removed bogus extra argument from usage fprintf() [Glenn R-P?];
+              fixed command-line parsing bug

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -52,14 +55,14 @@

 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "1.02 of 22 September 1999"
+#define VERSION   "1.04 of 19 March 2000"

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h>   /* for jmpbuf declaration in readpng2.h */
+#include <setjmp.h>    /* for jmpbuf declaration in readpng2.h */
 #include <time.h>
-#include <math.h>     /* only for PvdM background code */
+#include <math.h>      /* only for PvdM background code */
 #include <windows.h>

 /* all for PvdM background code: */
@@ -80,9 +83,9 @@
 #define rgb2_max   bg_bsat
 #define rgb2_min   bg_brot

-/* #define DEBUG */      /* this enables the Trace() macros */
+/* #define DEBUG */     /* this enables the Trace() macros */

-#include "readpng2.h"    /* typedefs, common macros, readpng2 prototypes */
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */


 /* could just include png.h, but this macro is the only thing we need
@@ -90,18 +93,18 @@
 * only happen with alpha (which could easily be avoided with
 * "ush acopy = (alpha);") */

-#define alpha_composite(composite, fg, alpha, bg) {              \
-    ush temp = ((ush)(fg)*(ush)(alpha) +                         \
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);              \
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }


-#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
-                        *  block size corresponds roughly to a download
-                        *  speed 10% faster than theoretical 33.6K maximum
-                        *  (assuming 8 data bits, 1 stop bit and no other
-                        *  overhead) */
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */

 /* local prototypes */
 static void       rpng2_win_init(void);
@@ -116,7 +119,7 @@ LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME; /* GRR:  not (yet) used */
+static char *icon_name = PROGNAME;    /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;

@@ -125,7 +128,7 @@ static mainprog_info rpng2_info;
 static uch inbuf[INBUFSIZE];
 static int incount;

-static int pat = 6;       /* must be less than num_bgpat */
+static int pat = 6;         /* must be less than num_bgpat */
 static int bg_image = 0;
 static int bgscale = 16;
 static ulg bg_rowbytes;
@@ -134,22 +137,22 @@ static uch *bg_data;
 static struct rgb_color {
    uch r, g, b;
 } rgb[] = {
-    {  0,   0,   0},   /*  0:  black */
-    {255, 255, 255},   /*  1:  white */
-    {173, 132,  57},   /*  2:  tan */
-    { 64, 132,   0},   /*  3:  medium green */
-    {189, 117,   1},   /*  4:  gold */
-    {253, 249,   1},   /*  5:  yellow */
-    {  0,   0, 255},   /*  6:  blue */
-    {  0,   0, 120},   /*  7:  medium blue */
-    {255,   0, 255},   /*  8:  magenta */
-    { 64,   0,  64},   /*  9:  dark magenta */
-    {255,   0,   0},   /* 10:  red */
-    { 64,   0,   0},   /* 11:  dark red */
-    {255, 127,   0},   /* 12:  orange */
-    {192,  96,   0},   /* 13:  darker orange */
-    { 24,  60,   0},   /* 14:  dark green-yellow */
-    { 85, 125, 200}    /* 15:  ice blue */
+    {  0,   0,   0},    /*  0:  black */
+    {255, 255, 255},    /*  1:  white */
+    {173, 132,  57},    /*  2:  tan */
+    { 64, 132,   0},    /*  3:  medium green */
+    {189, 117,   1},    /*  4:  gold */
+    {253, 249,   1},    /*  5:  yellow */
+    {  0,   0, 255},    /*  6:  blue */
+    {  0,   0, 120},    /*  7:  medium blue */
+    {255,   0, 255},    /*  8:  magenta */
+    { 64,   0,  64},    /*  9:  dark magenta */
+    {255,   0,   0},    /* 10:  red */
+    { 64,   0,   0},    /* 11:  dark red */
+    {255, 127,   0},    /* 12:  orange */
+    {192,  96,   0},    /* 13:  darker orange */
+    { 24,  60,   0},    /* 14:  dark green-yellow */
+    { 85, 125, 200}     /* 15:  ice blue */
 };
 /* not used for now, but should be for error-checking:
 static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
@@ -174,25 +177,25 @@ static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
 */
 static struct background_pattern {
    ush type;
-    int rgb1_max, rgb1_min;   /* or bg_freq, bg_gray */
-    int rgb2_max, rgb2_min;   /* or bg_bsat, bg_brot (both scaled by 10)*/
+    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */
+    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/
 } bg[] = {
-    {0+8,   2,0,  1,15},       /* checkered:  tan/black vs. white/ice blue */
-    {0+24,  2,0,  1,0},        /* checkered:  tan/black vs. white/black */
-    {0+8,   4,5,  0,2},        /* checkered:  gold/yellow vs. black/tan */
-    {0+8,   4,5,  0,6},        /* checkered:  gold/yellow vs. black/blue */
-    {0,     7,0,  8,9},        /* checkered:  deep blue/black vs. magenta */
-    {0+8,  13,0,  5,14},       /* checkered:  orange/black vs. yellow */
-    {0+8,  12,0, 10,11},       /* checkered:  orange/black vs. red */
-    {1,     7,0,  8,0},        /* diamonds:  deep blue/black vs. magenta */
-    {1,    12,0, 11,0},        /* diamonds:  orange vs. dark red */
-    {1,    10,0,  7,0},        /* diamonds:  red vs. medium blue */
-    {1,     4,0,  5,0},        /* diamonds:  gold vs. yellow */
-    {1,     3,0,  0,0},        /* diamonds:  medium green vs. black */
-    {2,    16, 100,  20,   0}, /* radial:  ~hard radial color-beams */
-    {2,    18, 100,  10,   2}, /* radial:  soft, curved radial color-beams */
-    {2,    16, 256, 100, 250}, /* radial:  very tight spiral */
-    {2, 10000, 256,  11,   0}  /* radial:  dipole-moire' (almost fractal) */
+    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */
+    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */
+    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */
+    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */
+    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */
+    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */
+    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */
+    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */
+    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */
+    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */
+    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */
+    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */
+    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
+    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
+    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
+    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */
 };
 static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);

@@ -212,16 +215,17 @@ static int global_showmode;

 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
 {
-    char *args[1024];   /* arbitrary limit, but should suffice */
-    char *p, *q, *bgstr = NULL, **argv = args;
+    char *args[1024];                 /* arbitrary limit, but should suffice */
+    char **argv = args;
+    char *p, *q, *bgstr = NULL;
    int argc = 0;
    int rc, alen, flen;
    int error = 0;
    int timing = FALSE;
    int have_bg = FALSE;
-    double LUT_exponent;             /* just the lookup table */
-    double CRT_exponent = 2.2;       /* just the monitor */
-    double default_display_exponent; /* whole display system */
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
    MSG msg;


@@ -316,33 +320,39 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* Now parse the command line for options and the PNG filename. */

    while (*++argv && !error) {
-        if (!strcmp(*argv, "-gamma")) {
+        if (!strncmp(*argv, "-gamma", 2)) {
            if (!*++argv)
                ++error;
-            rpng2_info.display_exponent = atof(*argv);
-            if (rpng2_info.display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
            else {
-                have_bg = TRUE;
-                bg_image = FALSE;
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
            }
-        } else if (!strcmp(*argv, "-bgpat")) {
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
            if (!*++argv)
                ++error;
-            pat = atoi(*argv) - 1;
-            if (pat < 0 || pat >= num_bgpat)
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
                ++error;
            else {
-                bg_image = TRUE;
-                have_bg = FALSE;
+                pat = atoi(*argv) - 1;
+                if (pat < 0 || pat >= num_bgpat)
+                    ++error;
+                else {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                }
            }
-        } else if (!strcmp(*argv, "-timing")) {
+        } else if (!strncmp(*argv, "-timing", 2)) {
            timing = TRUE;
        } else {
            if (**argv != '-') {
@@ -387,6 +397,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            fclose(infile);
    }

+
+    /* usage screen */
+
    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
@@ -398,14 +411,14 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images; overrides -bgpat\n"
          "    pat \tdesired background pattern number (1-%d); used with\n"
          "\t\t  transparent images; overrides -bgcolor\n"
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-          "\n", PROGNAME, " ", default_display_exponent, num_bgpat);
+          "\n", PROGNAME, default_display_exponent, num_bgpat);
        exit(1);
    }

@@ -560,7 +573,7 @@ static int rpng2_win_create_window()
    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
                              wimage_rowbytes*rpng2_info.height)))
    {
-        return 4; /* fail */
+        return 4;   /* fail */
    }

 /*---------------------------------------------------------------------------
@@ -655,7 +668,7 @@ static int rpng2_win_create_window()
        TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
        ReleaseDC(global_hwnd, hdc);

-        rpng2_win_load_bg_image(); /* resets bg_image if fails */
+        rpng2_win_load_bg_image();   /* resets bg_image if fails */
    }

    if (!bg_image) {
@@ -753,7 +766,7 @@ static int rpng2_win_load_bg_image()
                even_odd = even_odd_vert ^ even_odd_horiz;
                invert_column =
                  (even_odd_horiz && (bg[pat].type & 0x10));
-                if (even_odd == 0) {   /* gradient #1 */
+                if (even_odd == 0) {         /* gradient #1 */
                    if (invert_column) {
                        *dest++ = r1_inv;
                        *dest++ = g1_inv;
@@ -763,16 +776,16 @@ static int rpng2_win_load_bg_image()
                        *dest++ = g1;
                        *dest++ = b1;
                    }
-                } else {                /* gradient #2 */
+                } else {                     /* gradient #2 */
                    if ((invert_column && invert_gradient2) ||
                        (!invert_column && !invert_gradient2))
                    {
-                        *dest++ = r2;      /* not inverted or */
-                        *dest++ = g2;      /*  doubly inverted */
+                        *dest++ = r2;        /* not inverted or */
+                        *dest++ = g2;        /*  doubly inverted */
                        *dest++ = b2;
                    } else {
                        *dest++ = r2_inv;
-                        *dest++ = g2_inv;  /* singly inverted */
+                        *dest++ = g2_inv;    /* singly inverted */
                        *dest++ = b2_inv;
                    }
                }
@@ -908,7 +921,7 @@ static int rpng2_win_load_bg_image()
            g1 = *src++;
            b1 = *src++;
            *dest++ = b1;
-            *dest++ = g1; /* note reverse order */
+            *dest++ = g1;   /* note reverse order */
            *dest++ = r1;
        }
    }
@@ -962,7 +975,7 @@ static void rpng2_win_display_row(ulg row)
            g = *src++;
            b = *src++;
            *dest++ = b;
-            *dest++ = g; /* note reverse order */
+            *dest++ = g;   /* note reverse order */
            *dest++ = r;
        }
    } else /* if (rpng2_info.channels == 4) */ {
@@ -1028,7 +1041,9 @@ static void rpng2_win_finish_display()
     * that the image is done */

    rpng2_info.done = TRUE;
-    printf("Done.  Press Q, Esc or mouse button 1 to quit.\n");
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
 }


@@ -1084,15 +1099,15 @@ LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)

        /* wait for the user to tell us when to quit */
        case WM_CHAR:
-            switch (wP) { /* only need one, so ignore repeat count */
+            switch (wP) {       /* only need one, so ignore repeat count */
                case 'q':
                case 'Q':
-                case 0x1B: /* Esc key */
+                case 0x1B:      /* Esc key */
                    PostQuitMessage(0);
            }
            return 0;

-        case WM_LBUTTONDOWN: /* another way of quitting */
+        case WM_LBUTTONDOWN:    /* another way of quitting */
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
--- a/contrib/gregbook/rpng2-x.c
+++ b/contrib/gregbook/rpng2-x.c
@@ -6,9 +6,11 @@
   a web browser (though the front end is only set up to read from files).
   It supports gamma correction, user-specified background colors, and user-
   specified background patterns (for transparent images).  This version is
-   for the X Window System (tested under Unix, but may work under VMS or OS/2
-   with a little tweaking).  Thanks to Adam Costello and Pieter S. van der
-   Meulen for the "diamond" and "radial waves" patterns, respectively.
+   for the X Window System (tested by the author under Unix and by Martin
+   Zinser under OpenVMS; may work under OS/2 with a little tweaking).
+
+   Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"
+   and "radial waves" patterns, respectively.

   to do:
    - 8-bit support
@@ -17,7 +19,16 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed char/uchar mismatch
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added -usleep option for demos; fixed command-line parsing bug
+    - 1.12:  added -pause option for demos and testing
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -44,21 +55,21 @@

 #define PROGNAME  "rpng2-x"
 #define LONGNAME  "Progressive PNG Viewer for X"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.12 of 19 March 2000"

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
+#include <setjmp.h>       /* for jmpbuf declaration in readpng2.h */
 #include <time.h>
-#include <math.h>   /* only for PvdM background code */
+#include <math.h>         /* only for PvdM background code */
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>
-#include <X11/keysym.h> /* defines XK_* macros */
+#include <X11/keysym.h>   /* defines XK_* macros */

 #ifdef VMS
-#include <unistd.h>
+#  include <unistd.h>
 #endif

 /* all for PvdM background code: */
@@ -79,9 +90,9 @@
 #define rgb2_max   bg_bsat
 #define rgb2_min   bg_brot

-/* #define DEBUG */ /* this enables the Trace() macros */
+/* #define DEBUG */     /* this enables the Trace() macros */

-#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */


 /* could just include png.h, but this macro is the only thing we need
@@ -89,18 +100,18 @@
 * only happen with alpha (which could easily be avoided with
 * "ush acopy = (alpha);") */

-#define alpha_composite(composite, fg, alpha, bg) {              \
-    ush temp = ((ush)(fg)*(ush)(alpha) +                         \
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);              \
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }


-#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
-                        *  block size corresponds roughly to a download
-                        *  speed 10% faster than theoretical 33.6K maximum
-                        *  (assuming 8 data bits, 1 stop bit and no other
-                        *  overhead) */
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */

 /* local prototypes */
 static void rpng2_x_init(void);
@@ -123,12 +134,16 @@ static mainprog_info rpng2_info;
 static uch inbuf[INBUFSIZE];
 static int incount;

-static int pat = 6;  /* must be less than num_bgpat */
+static int pat = 6;        /* must be less than num_bgpat */
 static int bg_image = 0;
 static int bgscale = 16;
 static ulg bg_rowbytes;
 static uch *bg_data;

+int pause_after_pass = FALSE;
+int demo_timing = FALSE;
+ulg usleep_duration = 0L;
+
 static struct rgb_color {
    uch r, g, b;
 } rgb[] = {
@@ -201,12 +216,14 @@ static XImage *ximage;
 static Display *display;
 static int depth;
 static Visual *visual;
-static int RPixelShift, GPixelShift, BPixelShift;
-static ulg RedMask, GreenMask, BlueMask;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
 static Window window;
 static GC gc;
 static Colormap colormap;

+static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;

@@ -294,37 +311,53 @@ int main(int argc, char **argv)
    /* Now parse the command line for options and the PNG filename. */

    while (*++argv && !error) {
-        if (!strcmp(*argv, "-display")) {
+        if (!strncmp(*argv, "-display", 2)) {
            if (!*++argv)
                ++error;
-            displayname = *argv;
-        } else if (!strcmp(*argv, "-gamma")) {
+            else
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
            if (!*++argv)
                ++error;
-            rpng2_info.display_exponent = atof(*argv);
-            if (rpng2_info.display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
            else {
-                have_bg = TRUE;
-                bg_image = FALSE;
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
            }
-        } else if (!strcmp(*argv, "-bgpat")) {
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
            if (!*++argv)
                ++error;
-            pat = atoi(*argv) - 1;
-            if (pat < 0 || pat >= num_bgpat)
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
                ++error;
            else {
-                bg_image = TRUE;
-                have_bg = FALSE;
+                pat = atoi(*argv) - 1;
+                if (pat < 0 || pat >= num_bgpat)
+                    ++error;
+                else {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                }
            }
-        } else if (!strcmp(*argv, "-timing")) {
+        } else if (!strncmp(*argv, "-usleep", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                usleep_duration = (ulg)atol(*argv);
+                demo_timing = TRUE;
+            }
+        } else if (!strncmp(*argv, "-pause", 2)) {
+            pause_after_pass = TRUE;
+        } else if (!strncmp(*argv, "-timing", 2)) {
            timing = TRUE;
        } else {
            if (**argv != '-') {
@@ -377,25 +410,32 @@ int main(int argc, char **argv)
            fclose(infile);
    }

+
+    /* usage screen */
+
    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
        fprintf(stderr, "\n"
          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"
-          "        %*s [-timing] file.png\n\n"
+          "        %*s [-usleep dur | -timing] [-pause] file.png\n\n"
          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images; overrides -bgpat\n"
          "    pat \tdesired background pattern number (1-%d); used with\n"
          "\t\t  transparent images; overrides -bgcolor\n"
+          "    dur \tduration in microseconds to wait after displaying each\n"
+          "\t\t  row (for demo purposes)\n"
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+          "    -pause\tpauses after displaying each pass until key pressed\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
          "\n", PROGNAME, strlen(PROGNAME), " ", default_display_exponent,
          num_bgpat);
        exit(1);
@@ -489,7 +529,7 @@ int main(int argc, char **argv)
 * in turn is called by libpng after all of the pre-IDAT chunks have been
 * read and processed--i.e., we now have enough info to finish initializing */

-static void rpng2_x_init()
+static void rpng2_x_init(void)
 {
    ulg i;
    ulg rowbytes = rpng2_info.rowbytes;
@@ -531,12 +571,14 @@ static void rpng2_x_init()



-static int rpng2_x_create_window()
+static int rpng2_x_create_window(void)
 {
    ulg bg_red   = rpng2_info.bg_red;
    ulg bg_green = rpng2_info.bg_green;
    ulg bg_blue  = rpng2_info.bg_blue;
    ulg bg_pixel = 0L;
+    ulg attrmask;
+    int need_colormap = FALSE;
    int screen, pad;
    uch *xdata;
    Window root;
@@ -556,39 +598,70 @@ static int rpng2_x_create_window()
    depth = DisplayPlanes(display, screen);
    root = RootWindow(display, screen);

-/* GRR:  add 8-bit support */
-    if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
-        fprintf(stderr,
-          "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n",
-          depth);
-        return 2;
+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;
+
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
    }

-    XMatchVisualInfo(display, screen, depth,
-      (depth == 8)? PseudoColor : TrueColor, &visual_info);
-    visual = visual_info.visual;
-
-    RedMask   = visual->red_mask;
-    GreenMask = visual->green_mask;
-    BlueMask  = visual->blue_mask;
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;

 /* GRR:  add/check 8-bit support */
-    if (depth == 8) {
+    if (depth == 8 || need_colormap) {
        colormap = XCreateColormap(display, root, visual, AllocNone);
        if (!colormap) {
            fprintf(stderr, "XCreateColormap() failed\n");
            return 2;
        }
        have_colormap = TRUE;
-        bg_image = FALSE; /* gradient just wastes palette entries */
-    } else if (depth == 16) {
-        RPixelShift = 15 - rpng2_x_msb(RedMask);   /* these are right-shifts */
-        GPixelShift = 15 - rpng2_x_msb(GreenMask);
-        BPixelShift = 15 - rpng2_x_msb(BlueMask);
-    } else /* if (depth > 16) */ {
-        RPixelShift = rpng2_x_msb(RedMask) - 7;    /* these are left-shifts */
-        GPixelShift = rpng2_x_msb(GreenMask) - 7;
-        BPixelShift = rpng2_x_msb(BlueMask) - 7;
+        if (depth == 8)
+            bg_image = FALSE;   /* gradient just wastes palette entries */
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng2_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng2_x_msb(GMask);
+        BShift = 15 - rpng2_x_msb(BMask);
+    } else if (depth > 16) {
+        RShift = rpng2_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng2_x_msb(GMask) - 7;
+        BShift = rpng2_x_msb(BMask) - 7;
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng2 internal logic error:  negative X shift(s)!\n");
+        return 2;
    }

 /*---------------------------------------------------------------------------
@@ -597,10 +670,16 @@ static int rpng2_x_create_window()

    attr.backing_store = Always;
    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }

    window = XCreateWindow(display, root, 0, 0, rpng2_info.width,
-      rpng2_info.height, 0, depth, InputOutput, visual,
-      CWBackingStore | CWEventMask, &attr);
+      rpng2_info.height, 0, depth, InputOutput, visual, attrmask, &attr);

    if (window == None) {
        fprintf(stderr, "XCreateWindow() failed\n");
@@ -621,8 +700,9 @@ static int rpng2_x_create_window()
    if ((size_hints = XAllocSizeHints()) != NULL) {
        /* window will not be resizable */
        size_hints->flags = PMinSize | PMaxSize;
-        size_hints->min_width = size_hints->max_width = rpng2_info.width;
-        size_hints->min_height = size_hints->max_height = rpng2_info.height;
+        size_hints->min_width = size_hints->max_width = (int)rpng2_info.width;
+        size_hints->min_height = size_hints->max_height =
+          (int)rpng2_info.height;
    }

    if ((wm_hints = XAllocWMHints()) != NULL) {
@@ -668,7 +748,7 @@ static int rpng2_x_create_window()
        return 3;
    }

-    /* to avoid testing the bitmap order every pixel (or doubling the size of
+    /* to avoid testing the byte order every pixel (or doubling the size of
     * the drawing routine with a giant if-test), we arbitrarily set the byte
     * order to MSBFirst and let Xlib worry about inverting things on little-
     * endian machines (e.g., Linux/x86, old VAXen, etc.)--this is not the
@@ -684,17 +764,17 @@ static int rpng2_x_create_window()
  ---------------------------------------------------------------------------*/

    if (bg_image)
-        rpng2_x_load_bg_image(); /* resets bg_image if fails */
+        rpng2_x_load_bg_image();    /* resets bg_image if fails */

    if (!bg_image) {
        if (depth == 24 || depth == 32) {
-            bg_pixel = (bg_red   << RPixelShift) |
-                       (bg_green << GPixelShift) |
-                       (bg_blue  << BPixelShift);
+            bg_pixel = (bg_red   << RShift) |
+                       (bg_green << GShift) |
+                       (bg_blue  << BShift);
        } else if (depth == 16) {
-            bg_pixel = (((bg_red   << 8) >> RPixelShift) & RedMask)   |
-                       (((bg_green << 8) >> GPixelShift) & GreenMask) |
-                       (((bg_blue  << 8) >> BPixelShift) & BlueMask);
+            bg_pixel = (((bg_red   << 8) >> RShift) & RMask) |
+                       (((bg_green << 8) >> GShift) & GMask) |
+                       (((bg_blue  << 8) >> BShift) & BMask);
        } else /* depth == 8 */ {

            /* GRR:  add 8-bit support */
@@ -723,7 +803,7 @@ static int rpng2_x_create_window()



-static int rpng2_x_load_bg_image()
+static int rpng2_x_load_bg_image(void)
 {
    uch *src;
    char *dest;
@@ -772,8 +852,8 @@ static int rpng2_x_load_bg_image()
        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;

        for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
-            even_odd_vert = (row / bgscale) & 1;
+            yidx = (int)(row % bgscale);
+            even_odd_vert = (int)((row / bgscale) & 1);

            r1 = r1_min + (r1_diff * yidx) / yidx_max;
            g1 = g1_min + (g1_diff * yidx) / yidx_max;
@@ -789,13 +869,13 @@ static int rpng2_x_load_bg_image()
            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;

-            dest = (char *)(bg_data + row*bg_rowbytes);
+            dest = (char *)bg_data + row*bg_rowbytes;
            for (i = 0;  i < rpng2_info.width;  ++i) {
-                even_odd_horiz = (i / bgscale) & 1;
+                even_odd_horiz = (int)((i / bgscale) & 1);
                even_odd = even_odd_vert ^ even_odd_horiz;
                invert_column =
                  (even_odd_horiz && (bg[pat].type & 0x10));
-                if (even_odd == 0) { /* gradient #1 */
+                if (even_odd == 0) {        /* gradient #1 */
                    if (invert_column) {
                        *dest++ = r1_inv;
                        *dest++ = g1_inv;
@@ -805,16 +885,16 @@ static int rpng2_x_load_bg_image()
                        *dest++ = g1;
                        *dest++ = b1;
                    }
-                } else {              /* gradient #2 */
+                } else {                    /* gradient #2 */
                    if ((invert_column && invert_gradient2) ||
                        (!invert_column && !invert_gradient2))
                    {
-                        *dest++ = r2;      /* not inverted or */
-                        *dest++ = g2;      /*  doubly inverted */
+                        *dest++ = r2;       /* not inverted or */
+                        *dest++ = g2;       /*  doubly inverted */
                        *dest++ = b2;
                    } else {
                        *dest++ = r2_inv;
-                        *dest++ = g2_inv;  /* singly inverted */
+                        *dest++ = g2_inv;   /* singly inverted */
                        *dest++ = b2_inv;
                    }
                }
@@ -839,12 +919,12 @@ static int rpng2_x_load_bg_image()
        b2 = rgb[bg[pat].rgb2_max].b;

        for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
+            yidx = (int)(row % bgscale);
            if (yidx > hmax)
                yidx = bgscale-1 - yidx;
-            dest = (char *)(bg_data + row*bg_rowbytes);
+            dest = (char *)bg_data + row*bg_rowbytes;
            for (i = 0;  i < rpng2_info.width;  ++i) {
-                xidx = i % bgscale;
+                xidx = (int)(i % bgscale);
                if (xidx > hmax)
                    xidx = bgscale-1 - xidx;
                k = xidx + yidx;
@@ -871,8 +951,8 @@ static int rpng2_x_load_bg_image()
          PROGNAME);
        fflush(stderr);

-        hh = rpng2_info.height / 2;
-        hw = rpng2_info.width / 2;
+        hh = (int)(rpng2_info.height / 2);
+        hw = (int)(rpng2_info.width / 2);

        /* variables for radial waves:
         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
@@ -891,10 +971,10 @@ static int rpng2_x_load_bg_image()
        maxDist = (double)((hw*hw) + (hh*hh));

        for (row = 0;  row < rpng2_info.height;  ++row) {
-            y = row - hh;
-            dest = (char *)(bg_data + row*bg_rowbytes);
+            y = (int)(row - hh);
+            dest = (char *)bg_data + row*bg_rowbytes;
            for (i = 0;  i < rpng2_info.width;  ++i) {
-                x = i - hw;
+                x = (int)(i - hw);
                angle = (x == 0)? PI_2 : atan((double)y / (double)x);
                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
                gray = MIN(1.0, gray);
@@ -951,14 +1031,15 @@ static int rpng2_x_load_bg_image()
                red   = *src++;
                green = *src++;
                blue  = *src++;
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
                /* recall that we set ximage->byte_order = MSBFirst above */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        }

@@ -969,18 +1050,15 @@ static int rpng2_x_load_bg_image()
            src = bg_data + row*bg_rowbytes;
            dest = ximage->data + row*ximage_rowbytes;
            for (i = rpng2_info.width;  i > 0;  --i) {
-                red   = ((ush)(*src) << 8);
-                ++src;
-                green = ((ush)(*src) << 8);
-                ++src;
-                blue  = ((ush)(*src) << 8);
-                ++src;
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
+                red   = ((ush)(*src) << 8);  ++src;
+                green = ((ush)(*src) << 8);  ++src;
+                blue  = ((ush)(*src) << 8);  ++src;
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
                /* recall that we set ximage->byte_order = MSBFirst above */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        }

@@ -1011,7 +1089,7 @@ static void rpng2_x_display_row(ulg row)
    uch r, g, b, a;
    int ximage_rowbytes = ximage->bytes_per_line;
    ulg i, pixel;
-    static int rows=0;
+    static int rows=0, prevpass=(-1);
    static ulg firstrow;

 /*---------------------------------------------------------------------------
@@ -1022,8 +1100,28 @@ static void rpng2_x_display_row(ulg row)

    Trace((stderr, "beginning rpng2_x_display_row()\n"))

+    if (rpng2_info.pass != prevpass) {
+        if (pause_after_pass && rpng2_info.pass > 0) {
+            XEvent e;
+            KeySym k;
+
+            fprintf(stderr,
+              "%s:  end of pass %d of 7; click in image window to continue\n",
+              PROGNAME, prevpass + 1);
+            do
+                XNextEvent(display, &e);
+            while (!(e.type == ButtonPress && e.xbutton.button == Button1)
+                   && !(e.type == KeyPress &&
+                   ((k = XLookupKeysym(&e.xkey, 0)) == XK_q
+                    || k == XK_Escape) )) ;
+        }
+        fprintf(stderr, "%s:  pass %d of 7\r", PROGNAME, rpng2_info.pass + 1);
+        fflush(stderr);
+        prevpass = rpng2_info.pass;
+    }
+
    if (rows == 0)
-        firstrow = row;   /* first row not yet displayed */
+        firstrow = row;   /* first row that is not yet displayed */

    ++rows;   /* count of rows received but not yet displayed */

@@ -1046,14 +1144,15 @@ static void rpng2_x_display_row(ulg row)
                red   = *src++;
                green = *src++;
                blue  = *src++;
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        } else /* if (rpng2_info.channels == 4) */ {
            for (i = rpng2_info.width;  i > 0;  --i) {
@@ -1082,14 +1181,15 @@ static void rpng2_x_display_row(ulg row)
                    alpha_composite(green, g, a, bg_green);
                    alpha_composite(blue,  b, a, bg_blue);
                }
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        }

@@ -1108,12 +1208,12 @@ static void rpng2_x_display_row(ulg row)
                ++src;
                blue  = ((ush)(*src) << 8);
                ++src;
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        } else /* if (rpng2_info.channels == 4) */ {
            for (i = rpng2_info.width;  i > 0;  --i) {
@@ -1145,12 +1245,12 @@ static void rpng2_x_display_row(ulg row)
                    green = ((ush)g << 8);
                    blue  = ((ush)b << 8);
                }
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
            }
        }

@@ -1162,13 +1262,23 @@ static void rpng2_x_display_row(ulg row)


 /*---------------------------------------------------------------------------
-    Display after every 16 rows or when on last row.  (Region may include
-    previously displayed lines due to interlacing--i.e., not contiguous.)
+    Display after every 16 rows or when on one of last two rows.  (Region
+    may include previously displayed lines due to interlacing--i.e., not
+    contiguous.  Also, second-to-last row is final one in interlaced images
+    with odd number of rows.)  For demos, flush (and delay) after every 16th
+    row so "sparse" passes don't go twice as fast.
  ---------------------------------------------------------------------------*/

-    if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {
-        XPutImage(display, window, gc, ximage, 0, firstrow, 0, firstrow,
-          rpng2_info.width, row - firstrow + 1);
+    if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
+        XFlush(display);
+        rows = 0;
+        usleep(usleep_duration);
+    } else
+    if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
        XFlush(display);
        rows = 0;
    }
@@ -1179,7 +1289,7 @@ static void rpng2_x_display_row(ulg row)



-static void rpng2_x_finish_display()
+static void rpng2_x_finish_display(void)
 {
    Trace((stderr, "beginning rpng2_x_finish_display()\n"))

@@ -1188,14 +1298,16 @@ static void rpng2_x_finish_display()
     * the image is done */

    rpng2_info.done = TRUE;
-    printf("Done.  Press Q, Esc or mouse button 1 to quit.\n");
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
 }





-static void rpng2_x_cleanup()
+static void rpng2_x_cleanup(void)
 {
    if (bg_image && bg_data) {
        free(bg_data);
@@ -1228,6 +1340,9 @@ static void rpng2_x_cleanup()

    if (have_colormap)
        XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
 }


--- a/contrib/gregbook/toucan.png
+++ b/contrib/gregbook/toucan.png
--- a/contrib/gregbook/wpng.c
+++ b/contrib/gregbook/wpng.c
@@ -19,7 +19,15 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options
+    - 1.03:  removed extraneous character from usage screen; fixed bug in
+              command-line parsing
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -45,7 +53,7 @@
  ---------------------------------------------------------------------------*/

 #define PROGNAME  "wpng"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.03 of 19 March 2000"
 #define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"

 #if defined(__MSDOS__) || defined(__OS2__)
@@ -57,27 +65,27 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h>  /* for jmpbuf declaration in writepng.h */
+#include <setjmp.h>     /* for jmpbuf declaration in writepng.h */
 #include <time.h>

 #ifdef DOS_OS2_W32
-#  include <io.h>    /* for isatty(), setmode() prototypes */
-#  include <fcntl.h> /* O_BINARY for fdopen() without text translation */
+#  include <io.h>       /* for isatty(), setmode() prototypes */
+#  include <fcntl.h>    /* O_BINARY for fdopen() without text translation */
 #  ifdef __EMX__
 #    ifndef getch
-#      define getch() _read_kbd(0, 1, 0) /* need getche() */
+#      define getch() _read_kbd(0, 1, 0)    /* need getche() */
 #    endif
 #  else /* !__EMX__ */
 #    ifdef __GO32__
 #      include <pc.h>
-#      define getch() getkey() /* GRR:  need getche() */
+#      define getch() getkey()  /* GRR:  need getche() */
 #    else
-#      include <conio.h> /* for getche() console input */
+#      include <conio.h>        /* for getche() console input */
 #    endif
 #  endif /* ?__EMX__ */
 #  define FGETS(buf,len,stream)  dos_kbd_gets(buf,len)
 #else
-#  include <unistd.h>  /* for isatty() prototype */
+#  include <unistd.h>           /* for isatty() prototype */
 #  define FGETS fgets
 #endif

@@ -87,7 +95,7 @@
   text that includes control characters discouraged by the PNG spec; text
   that includes an escape character (27) must be re-entered regardless */

-#include "writepng.h" /* typedefs, common macros, writepng prototypes */
+#include "writepng.h"   /* typedefs, common macros, writepng prototypes */



@@ -112,7 +120,7 @@ int main(int argc, char **argv)
    FILE *keybd;
 #endif
 #ifdef sgi
-    FILE *tmpfile; /* or we could just use keybd, since no overlap */
+    FILE *tmpfile;      /* or we could just use keybd, since no overlap */
    char tmpline[80];
 #endif
    char *inname = NULL, outname[256];
@@ -204,36 +212,40 @@ int main(int argc, char **argv)
    /* Now parse the command line for options and the PNM filename. */

    while (*++argv && !error) {
-        if (!strcmp(*argv, "-interlaced")) {
+        if (!strncmp(*argv, "-i", 2)) {
            wpng_info.interlaced = TRUE;
-        } else if (!strcmp(*argv, "-time")) {
+        } else if (!strncmp(*argv, "-time", 3)) {
            wpng_info.modtime = time(NULL);
            wpng_info.have_time = TRUE;
-        } else if (!strcmp(*argv, "-text")) {
+        } else if (!strncmp(*argv, "-text", 3)) {
            text = TRUE;
-        } else if (!strcmp(*argv, "-gamma")) {
+        } else if (!strncmp(*argv, "-gamma", 2)) {
            if (!*++argv)
                ++error;
-            wpng_info.gamma = atof(*argv);
-            if (wpng_info.gamma <= 0.0)
-                ++error;
-            else if (wpng_info.gamma > 1.01)
-                fprintf(stderr, PROGNAME
-                  " warning:  file gammas are usually less than 1.0\n");
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
            else {
-                unsigned r, g, b;  /* this approach quiets compiler warnings */
+                wpng_info.gamma = atof(*argv);
+                if (wpng_info.gamma <= 0.0)
+                    ++error;
+                else if (wpng_info.gamma > 1.01)
+                    fprintf(stderr, PROGNAME
+                      " warning:  file gammas are usually less than 1.0\n");
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    unsigned r, g, b;  /* this way quiets compiler warnings */

-                sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
-                wpng_info.bg_red   = (uch)r;
-                wpng_info.bg_green = (uch)g;
-                wpng_info.bg_blue  = (uch)b;
-                wpng_info.have_bg = TRUE;
+                    sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+                    wpng_info.bg_red   = (uch)r;
+                    wpng_info.bg_green = (uch)g;
+                    wpng_info.bg_blue  = (uch)b;
+                    wpng_info.have_bg = TRUE;
+                }
            }
        } else {
            if (**argv != '-') {
@@ -362,7 +374,7 @@ int main(int argc, char **argv)
         "\t\t  (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
         "\t\t  first varies, second is usually 2.2, all are positive)\n"
         "    bg  \tdesired background color for alpha-channel images, in\n"
-         "\t\t  7-character hex RGB format (e.g., ``#ff7f00'' for orange:\n"
+         "\t\t  7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
         "\t\t  same as HTML colors)\n"
         "    -text\tprompt interactively for text info (tEXt chunks)\n"
         "    -time\tinclude a tIME chunk (last modification time)\n"
@@ -419,7 +431,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_TITLE;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_TITLE;
                        valid = FALSE;
                    }
@@ -449,7 +461,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_AUTHOR;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_AUTHOR;
                        valid = FALSE;
                    }
@@ -489,7 +501,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_DESC;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_DESC;
                        valid = FALSE;
                    }
@@ -519,7 +531,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_COPY;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_COPY;
                        valid = FALSE;
                    }
@@ -549,7 +561,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_EMAIL;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_EMAIL;
                        valid = FALSE;
                    }
@@ -579,7 +591,7 @@ int main(int argc, char **argv)
                    wpng_info.have_text &= ~TEXT_URL;
                    valid = FALSE;
 #else
-                    if (p[result] == 27) { /* escape character */
+                    if (p[result] == 27) {    /* escape character */
                        wpng_info.have_text &= ~TEXT_URL;
                        valid = FALSE;
                    }
@@ -755,7 +767,7 @@ static int wpng_isvalid_latin1(uch *p, int len)



-static void wpng_cleanup()
+static void wpng_cleanup(void)
 {
    if (wpng_info.outfile) {
        fclose(wpng_info.outfile);
@@ -791,11 +803,11 @@ static char *dos_kbd_gets(char *buf, int len)
        buf[count++] = ch = getche();
    } while (ch != '\r' && count < len-1);

-    buf[count--] = '\0';     /* terminate string */
-    if (buf[count] == '\r')  /* Enter key makes CR, so change to newline */
+    buf[count--] = '\0';        /* terminate string */
+    if (buf[count] == '\r')     /* Enter key makes CR, so change to newline */
        buf[count] = '\n';

-    fprintf(stderr, "\n");   /* Enter key does *not* cause a newline */
+    fprintf(stderr, "\n");      /* Enter key does *not* cause a newline */
    fflush(stderr);

    return buf;
--- a/contrib/gregbook/writepng.c
+++ b/contrib/gregbook/writepng.c
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -30,10 +30,10 @@
  ---------------------------------------------------------------------------*/


-#include <stdlib.h>   /* for exit() prototype */
+#include <stdlib.h>     /* for exit() prototype */

-#include "png.h"      /* libpng header; includes zlib.h and setjmp.h */
-#include "writepng.h" /* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include "writepng.h"   /* typedefs, common macros, public prototypes */


 /* local prototype */
@@ -42,7 +42,7 @@ static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);



-void writepng_version_info()
+void writepng_version_info(void)
 {
  fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
    PNG_LIBPNG_VER_STRING, png_libpng_ver);
--- a/contrib/gregbook/writepng.h
+++ b/contrib/gregbook/writepng.h
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
--- a/contrib/pngminus/png2pnm.c
+++ b/contrib/pngminus/png2pnm.c
@@ -42,6 +42,11 @@

 #include "png.h"

+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* function prototypes */

 int  main (int argc, char *argv[]);
@@ -223,7 +228,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
    return FALSE;   /* out of memory */
  }

-  if (setjmp (png_ptr->jmpbuf))
+  if (setjmp (png_jmpbuf(png_ptr)))
  {
    png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
    return FALSE;
--- a/contrib/pngminus/pnm2png.c
+++ b/contrib/pngminus/pnm2png.c
@@ -40,6 +40,11 @@

 #include "png.h"

+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* function prototypes */

 int  main (int argc, char *argv[]);
@@ -77,7 +82,8 @@ int main(int argc, char *argv[])
          if ((fp_al = fopen (argv[argi], "rb")) == NULL)
          {
            fprintf (stderr, "PNM2PNG\n");
-            fprintf (stderr, "Error:  alpha-channel file %s does not exist\n", argv[argi]);
+            fprintf (stderr, "Error:  alpha-channel file %s does not exist\n",
+               argv[argi]);
            exit (1);
          }
          break;
@@ -385,7 +391,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
  }

  /* setjmp() must be called in every function that calls a PNG-reading libpng function */
-  if (setjmp (png_ptr->jmpbuf))
+  if (setjmp (png_jmpbuf(png_ptr)))
  {
    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
    return FALSE;
@@ -511,8 +517,8 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
    for (i = 0; i < depth; i++)
      mask = (mask << 1) | 0x01;

-  get_token (pnm_file, token);
-  sscanf (token, "%lu", &ret_value);
+  get_token (pnm_file, (char *) token);
+  sscanf ((const char *) token, "%lu", &ret_value);

  ret_value &= mask;

--- a/example.c
+++ b/example.c
@@ -6,17 +6,28 @@
 /* This is an example of how to use libpng to read and write PNG files.
 * The file libpng.txt is much more verbose then this.  If you have not
 * read it, do so first.  This was designed to be a starting point of an
- * implementation.  This is not officially part of libpng, and therefore
- * does not require a copyright notice.
+ * implementation.  This is not officially part of libpng, is hereby placed
+ * in the public domain, and therefore does not require a copyright notice.
 *
 * This file does not currently compile, because it is missing certain
 * parts, like allocating memory to hold an image.  You will have to
 * supply these parts to get it to compile.  For an example of a minimal
- * working PNG reader/writer, see pngtest.c, included in this distribution.
+ * working PNG reader/writer, see pngtest.c, included in this distribution;
+ * see also the programs in the contrib directory.
 */

 #include "png.h"

+ /* The png_jmpbuf() macro, used in error handling, became available in
+  * libpng version 1.0.6.  If you want to be able to run your code with older
+  * versions of libpng, you must define the macro yourself (but only if it
+  * is not already defined by libpng!).
+  */
+
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* Check to see if a file is a PNG file using png_sig_cmp().  png_sig_cmp()
 * returns zero if the image is a PNG and nonzero if it isn't a PNG.
 *
@@ -43,7 +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 */
@@ -111,7 +122,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    * the normal method of doing things with libpng).  REQUIRED unless you
    * set up your own error handlers in the png_create_read_struct() earlier.
    */
-   if (setjmp(png_ptr->jmpbuf))
+
+   if (setjmp(png_jmpbuf(png_ptr)))
   {
      /* Free all of the memory associated with the png_ptr and info_ptr */
      png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
@@ -136,6 +148,19 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
   /* If we have already read some of the signature */
   png_set_sig_bytes(png_ptr, sig_read);

+#ifdef hilevel
+   /*
+    * If you have enough memory to read in the entire image at once,
+    * and you need to specify only transforms that can be controlled
+    * with one of the PNG_TRANSFORM_* bits (this presently excludes
+    * dithering, filling, setting background, and doing gamma
+    * adjustment), then you can read the entire image (including
+    * pixels) into the info structure with this call:
+    */
+   png_read_png(png_ptr, info_ptr, png_transforms, NULL);
+#else
+   /* OK, you're doing it the hard way, with the lower-level functions */
+
   /* The call to png_read_info() gives us all of the information from the
    * PNG file before the first IDAT (image data chunk).  REQUIRED
    */
@@ -218,7 +243,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
      screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
   }

-   /* Tell libpng to handle the gamma conversion for you.  The second call
+   /* Tell libpng to handle the gamma conversion for you.  The final call
    * is a good guess for PC generated images, but it should be configurable
    * by the user at run time by the user.  It is strongly suggested that
    * your application support gamma correction.
@@ -227,7 +252,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
   int intent;

   if (png_get_sRGB(png_ptr, info_ptr, &intent))
-      png_set_sRGB(png_ptr, info_ptr, intent);
+      png_set_gamma(png_ptr, screen_gamma, 0.45455);
   else
   {
      double image_gamma;
@@ -275,7 +300,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    */
   if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
   {
-      png_color8p sig_bit;
+      png_color_8p sig_bit;

      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
      png_set_shift(png_ptr, sig_bit);
@@ -350,6 +375,9 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */

   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
   png_read_end(png_ptr, info_ptr);
+#endif hilevel
+
+   /* At this point you have read the entire image */

   /* clean up after the read, and free any memory allocated - REQUIRED */
   png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
@@ -389,7 +417,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
      return ERROR;
   }

-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
   {
      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
      return ERROR;
@@ -417,7 +445,7 @@ int
 process_data(png_structp *png_ptr, png_infop *info_ptr,
   png_bytep buffer, png_uint_32 length)
 {
-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
   {
      /* Free the png_ptr and info_ptr memory on error */
      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
@@ -499,6 +527,7 @@ void write_png(char *file_name /* , ... other image information ... */)
   FILE *fp;
   png_structp png_ptr;
   png_infop info_ptr;
+   png_colorp palette;

   /* open the file */
   fp = fopen(file_name, "wb");
@@ -530,13 +559,13 @@ void write_png(char *file_name /* , ... other image information ... */)
   }

   /* Set error handling.  REQUIRED if you aren't supplying your own
-    * error hadnling functions in the png_create_write_struct() call.
+    * error handling functions in the png_create_write_struct() call.
    */
-   if (setjmp(png_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(png_ptr)))
   {
      /* 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;
   }

@@ -552,6 +581,15 @@ void write_png(char *file_name /* , ... other image information ... */)
   /* where user_io_ptr is a structure you want available to the callbacks */
 #endif no_streams /* only use one initialization method */

+#ifdef hilevel
+   /* This is the easy way.  Use it if you already have all the
+    * image info living info in the structure.  You could "|" many
+    * PNG_TRANSFORM flags into the png_transforms integer here.
+    */
+   png_write_png(png_ptr, info_ptr, png_transforms, NULL);
+#else
+   /* This is the hard way */
+
   /* Set the image information here.  Width and height are up to 2^31,
    * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
    * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
@@ -567,6 +605,9 @@ void write_png(char *file_name /* , ... other image information ... */)
   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
   /* ... set palette colors ... */
   png_set_PLTE(png_ptr, info_ptr, palette, 256);
+   /* 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. */

   /* optional significant bit chunk */
   /* if we are dealing with a grayscale image then */
@@ -603,7 +644,7 @@ void write_png(char *file_name /* , ... other image information ... */)
   png_set_text(png_ptr, info_ptr, text_ptr, 3);

   /* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
-   /* note that if sRGB is present the cHRM chunk must be ignored
+   /* note that if sRGB is present the gAMA and cHRM chunks must be ignored
    * on read and must be written in accordance with the sRGB profile */

   /* Write the file header information.  REQUIRED */
@@ -615,6 +656,9 @@ void write_png(char *file_name /* , ... other image information ... */)
    *   png_write_info_before_PLTE(write_ptr, write_info_ptr);
    *   write_my_chunk();
    *   png_write_info(png_ptr, info_ptr);
+    *
+    * However, given the level of known- and unknown-chunk support in 1.1.0
+    * and up, this should no longer be necessary.
    */

   /* Once we write out the header, the compression type on the text
@@ -666,10 +710,10 @@ void write_png(char *file_name /* , ... other image information ... */)
    * use the first method if you aren't handling interlacing yourself.
    */
   png_uint_32 k, height, width;
-   png_byte image[height][width];
+   png_byte image[height][width*bytes_per_pixel];
   png_bytep row_pointers[height];
   for (k = 0; k < height; k++)
-     row_pointers[k] = image + k*width;
+     row_pointers[k] = image + k*width*bytes_per_pixel;

   /* One of the following output methods is REQUIRED */
 #ifdef entire /* write out the entire image data in one call */
@@ -695,17 +739,29 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif no_entire /* use only one output method */

   /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.
+    * as well.  Shouldn't be necessary in 1.1.0 and up as all the public
+    * chunks are supported and you can use png_set_unknown_chunks() to
+    * register unknown chunks into the info structure to be written out.
    */

   /* It is REQUIRED to call this to finish writing the rest of the file */
   png_write_end(png_ptr, info_ptr);
+#endif hilevel

-   /* if you malloced the palette, free it here */
-   free(info_ptr->palette);
+   /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
+      as recommended in versions 1.0.5m and earlier of this example; if
+      libpng mallocs info_ptr->palette, libpng will free it).  If you
+      allocated it with malloc() instead of png_malloc(), use free() instead
+      of png_free(). */
+   png_free(png_ptr, palette);
+
+   /* Similarly, if you png_malloced any data that you passed in with
+      png_set_something(), such as a hist or trans array, free it here,
+      when you can be sure that libpng is through with it. */
+   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);
--- a/libpng.3
+++ b/libpng.3
--- a/libpng.txt
+++ b/libpng.txt
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 December 10, 1999
+.TH LIBPNGPF 3 "April 24, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6h
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -55,6 +55,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h

 \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
@@ -187,6 +191,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h

 \fI\fB

+\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP

 \fI\fB
@@ -505,9 +513,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h

 \fI\fB

-\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, \fIpng_spalette_p
-
-\fI\fBpalette\fP\fB);\fP
+\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP

 \fI\fB

--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "December 10, 1999"
+.TH PNG 5 "April 24, 2000"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -20,10 +20,12 @@ platforms.
 .SH "SEE ALSO"
 .IR libpng(3), zlib(3), deflate(5), and zlib(5)
 .LP
-PNG 1.1 specification, January 1999:
+PNG 1.2 specification, July 1999:
 .IP
 .br
-http://www.cdrom.com/pub/png
+http://www.cdrom.com/pub/png (moving to http://www.libpng.org)
+.br
+or ftp://ftp.uu.net/graphics/png/documents
 .LP
 PNG 1.0 specification, October 1996:
 .IP
--- a/png.c
+++ b/png.c
@@ -1,24 +1,27 @@

 /* png.c - location for general purpose libpng functions
 *
- * libpng version 1.0.5h - December 10, 1999
+ * libpng version 1.0.6h - April 24, 2000
 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 */

 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
+#include <assert.h>
 #include "png.h"

+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_0_6h Your_png_h_is_not_version_1_0_6h;
+
 /* Version information for C files.  This had better match the version
- * string defined in png.h.
- */
+ * 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] = "1.0.5h";
+char png_libpng_ver[12] = "1.0.6h";

 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -61,10 +64,10 @@ int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 /* offset to next interlace block in the y direction */
 int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};

-/* Width of interlace block.  This is not currently used - if you need
- * it, uncomment it here and in png.h
+/* width of interlace block (used in assembler routines only) */
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
 int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-*/
+#endif

 /* Height of interlace block.  This is not currently used - if you need
 * it, uncomment it here and in png.h
@@ -258,56 +261,82 @@ png_info_init(png_infop info_ptr)
   png_memset(info_ptr, 0, sizeof (png_info));
 }

+void
+png_data_freer(png_structp png_ptr, png_infop info_ptr,
+   int freer, png_uint_32 mask)
+{
+   png_debug(1, "in png_data_freer\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   if(freer == PNG_DESTROY_WILL_FREE_DATA)
+      info_ptr->free_me |= mask;
+   else if(freer == PNG_USER_WILL_FREE_DATA)
+      info_ptr->free_me &= ~mask;
+   else
+      png_warning(png_ptr,
+         "Unknown freer parameter in png_data_freer.");
+}
+
+void
+png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
+{
+   png_debug(1, "in png_free_data\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
 #if defined(PNG_TEXT_SUPPORTED)
 /* free text item num or (if num == -1) all text items */
-void
-png_free_text(png_structp png_ptr, png_infop info_ptr, int num)
+if (mask & info_ptr->free_me & PNG_FREE_TEXT)
 {
-    if (num != -1)
-    {
-    if (info_ptr->text[num].key)
-    {
-        png_free(png_ptr, info_ptr->text[num].key);
-        info_ptr->text[num].key = NULL;
-    }
-    if (info_ptr->text[num].lang)
-    {
-        png_free(png_ptr, info_ptr->text[num].lang);
-        info_ptr->text[num].lang = NULL;
-    }
-    }
-    else if (info_ptr->text != NULL)
-    {
-    int i;
-    for (i = 0; i < info_ptr->num_text; i++)
-        png_free_text(png_ptr, info_ptr, i);
-    png_free(png_ptr, info_ptr->text);
-    info_ptr->text = NULL;
-    }
+   if (num != -1)
+   {
+     if (info_ptr->text[num].key)
+     {
+         png_free(png_ptr, info_ptr->text[num].key);
+         info_ptr->text[num].key = NULL;
+     }
+   }
+   else if (info_ptr->text != NULL)
+   {
+     int i;
+     for (i = 0; i < info_ptr->num_text; i++)
+         png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+     png_free(png_ptr, info_ptr->text);
+     info_ptr->text = NULL;
+     info_ptr->num_text=0;
+   }
+}
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED)
+/* free any tRNS entry */
+if (mask & PNG_FREE_TRNS)
+{
+   if (info_ptr->valid & PNG_INFO_tRNS)
+   {
+       if (info_ptr->free_me & PNG_FREE_TRNS)
+         png_free(png_ptr, info_ptr->trans);
+       info_ptr->valid &= ~PNG_INFO_tRNS;
+   }
 }
 #endif

 #if defined(PNG_sCAL_SUPPORTED)
 /* free any sCAL entry */
-void
-png_free_sCAL(png_structp png_ptr, png_infop info_ptr)
 {
   if (info_ptr->valid & PNG_INFO_sCAL)
   {
-       png_free(png_ptr, info_ptr->scal_unit);
-#ifdef PNG_FIXED_POINT_SUPPORTED
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
       png_free(png_ptr, info_ptr->scal_s_width);
       png_free(png_ptr, info_ptr->scal_s_height);
 #endif
-       info_ptr->valid &= ~PNG_INFO_sCAL;
+          info_ptr->valid &= ~PNG_INFO_sCAL;
   }
 }
 #endif

 #if defined(PNG_pCAL_SUPPORTED)
 /* free any pCAL entry */
-void
-png_free_pCAL(png_structp png_ptr, png_infop info_ptr)
 {
   if (info_ptr->valid & PNG_INFO_pCAL)
   {
@@ -317,9 +346,9 @@ png_free_pCAL(png_structp png_ptr, png_infop info_ptr)
       {
           int i;
           for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-           {
-               png_free(png_ptr, info_ptr->pcal_params[i]);
-           }
+             {
+             png_free(png_ptr, info_ptr->pcal_params[i]);
+             }
           png_free(png_ptr, info_ptr->pcal_params);
       }
       info_ptr->valid &= ~PNG_INFO_pCAL;
@@ -328,14 +357,16 @@ png_free_pCAL(png_structp png_ptr, png_infop info_ptr)
 #endif

 #if defined(PNG_iCCP_SUPPORTED)
-/* free any pCAL entry */
-void
-png_free_iCCP(png_structp png_ptr, png_infop info_ptr)
+/* free any iCCP entry */
+if (mask & PNG_FREE_ICCP)
 {
   if (info_ptr->valid & PNG_INFO_iCCP)
   {
-       png_free(png_ptr, info_ptr->iccp_name);
-       png_free(png_ptr, info_ptr->iccp_profile);
+       if (info_ptr->free_me & PNG_FREE_ICCP)
+       {
+         png_free(png_ptr, info_ptr->iccp_name);
+         png_free(png_ptr, info_ptr->iccp_profile);
+       }
       info_ptr->valid &= ~PNG_INFO_iCCP;
   }
 }
@@ -343,30 +374,31 @@ png_free_iCCP(png_structp png_ptr, png_infop info_ptr)

 #if defined(PNG_sPLT_SUPPORTED)
 /* free a given sPLT entry, or (if num == -1) all sPLT entries */
-void
-png_free_spalette(png_structp png_ptr, png_infop info_ptr, int num)
+if (mask & PNG_FREE_SPLT)
 {
   if (num != -1)
   {
       png_free(png_ptr, info_ptr->splt_palettes[num].name);
       png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+       info_ptr->valid &= ~PNG_INFO_sPLT;
   }
   else
   {
-       png_uint_32 i;
+       if(info_ptr->splt_palettes_num)
+       {
+         int i;
+         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+            png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);

-       for (i = 0; i < info_ptr->splt_palettes_num; i++)
-          png_free_spalette(png_ptr, info_ptr, num);
-
-       png_free(png_ptr, info_ptr->splt_palettes);
-       info_ptr->splt_palettes_num = 0;
+         png_free(png_ptr, info_ptr->splt_palettes);
+         info_ptr->splt_palettes_num = 0;
+       }
   }
 }
 #endif

 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-void
-png_free_unknown_chunk(png_structp png_ptr, png_infop info_ptr, int num)
+if (mask & PNG_FREE_UNKN)
 {
   if (num != -1)
   {
@@ -375,17 +407,63 @@ png_free_unknown_chunk(png_structp png_ptr, png_infop info_ptr, int num)
   }
   else
   {
-       png_uint_32 i;
+       int i;

-       for (i = 0; i < info_ptr->unknown_chunks_num; i++)
-          png_free_unknown_chunk(png_ptr, info_ptr, num);
+       if(info_ptr->unknown_chunks_num)
+       {
+         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);

-       png_free(png_ptr, info_ptr->unknown_chunks);
-       info_ptr->unknown_chunks_num = 0;
+         png_free(png_ptr, info_ptr->unknown_chunks);
+         info_ptr->unknown_chunks_num = 0;
+       }
   }
 }
 #endif

+#if defined(PNG_hIST_SUPPORTED)
+/* free any hIST entry */
+if (mask & PNG_FREE_HIST)
+{
+   if (info_ptr->valid & PNG_INFO_hIST)
+   {
+       if (info_ptr->free_me & PNG_FREE_HIST)
+         png_free(png_ptr, info_ptr->hist);
+       info_ptr->valid &= ~PNG_INFO_hIST;
+   }
+}
+#endif
+
+/* free any PLTE entry that was internally allocated */
+if (mask & PNG_FREE_PLTE)
+{
+   if (info_ptr->valid & PNG_INFO_PLTE)
+   {
+       if (info_ptr->free_me & PNG_FREE_PLTE)
+          png_zfree(png_ptr, info_ptr->palette);
+       info_ptr->valid &= ~(PNG_INFO_PLTE);
+       info_ptr->num_palette = 0;
+   }
+}
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* free any image bits attached to the info structure */
+if (mask & PNG_FREE_ROWS)
+{
+   if (info_ptr->free_me & PNG_FREE_ROWS)
+   {
+       int row;
+
+       for (row = 0; row < (int)info_ptr->height; row++)
+          png_free(png_ptr, info_ptr->row_pointers[row]);
+       png_free(png_ptr, info_ptr->row_pointers);
+   }
+}
+#endif
+   if(num == -1)
+     info_ptr->free_me &= ~mask;
+}
+
 /* This is an internal routine to free any memory that the info struct is
 * pointing to before re-using it or freeing the struct itself.  Recall
 * that png_free() checks for NULL pointers for us.
@@ -394,24 +472,17 @@ void
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
   png_debug(1, "in png_info_destroy\n");
-#if defined(PNG_READ_TEXT_SUPPORTED)
-   png_free_text(png_ptr, info_ptr, -1);
-#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-   png_free_sCAL(png_ptr, info_ptr);
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-   png_free_pCAL(png_ptr, info_ptr);
-#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-   png_free_iCCP(png_ptr, info_ptr);
-#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
-   png_free_spalette(png_ptr, info_ptr, -1);
-#endif
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+    
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   png_free_unknown_chunk(png_ptr, info_ptr, -1);
+   if (png_ptr->num_chunk_list)
+   {
+       png_free(png_ptr, png_ptr->chunk_list);
+       png_ptr->num_chunk_list=0;
+   }
 #endif
+
   png_info_init(info_ptr);
 }

@@ -428,7 +499,9 @@ png_get_io_ptr(png_structp png_ptr)
 #if !defined(PNG_NO_STDIO)
 /* Initialize the default input/output functions for the PNG file.  If you
 * use your own read or write routines, you can call either png_set_read_fn()
- * or png_set_write_fn() instead of png_init_io().
+ * or png_set_write_fn() instead of png_init_io().  If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
 */
 void
 png_init_io(png_structp png_ptr, FILE *fp)
@@ -475,24 +548,23 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 }
 #endif /* PNG_TIME_RFC1123_SUPPORTED */

+#if 0
 /* Signature string for a PNG file. */
 png_bytep
-png_sig_bytes(png_structp png_ptr)
+png_sig_bytes(void)
 {
-   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));
+   return ((png_bytep)"\211\120\116\107\015\012\032\012");
 }
+#endif

 png_charp
 png_get_copyright(png_structp png_ptr)
 {
   if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ("\n libpng version 1.0.5h - December 10, 1999\n\
+   return ("\n libpng version 1.0.6h - April 24, 2000\n\
   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
   Copyright (c) 1996, 1997 Andreas Dilger\n\
-   Copyright (c) 1998, 1999 Glenn Randers-Pehrson\n");
+   Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson\n");
   return ("");
 }

@@ -507,8 +579,8 @@ 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("1.0.5h");
-   return("1.0.5h");
+      return("1.0.6h");
+   return("1.0.6h");
 }

 png_charp
@@ -529,11 +601,26 @@ png_get_header_version(png_structp png_ptr)
   return(PNG_HEADER_VERSION_STRING);
 }

-/* Generate a compiler error if there is an old png.h in the search path. */
-void
-png_check_version
-   (version_1_0_5h png_h_is_not_version_1_0_5h)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+int
+png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 {
-   if(png_h_is_not_version_1_0_5h == NULL)
-     return;
+   /* check chunk_name and return "keep" value if it's on the list, else 0 */
+   int i;
+   png_bytep p;
+   if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+      return 0;
+   p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
+   for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+      if (!png_memcmp(chunk_name, p, 4))
+        return ((int)*(p+4));
+   return 0;
+}
+#endif
+
+/* This function, added to libpng-1.0.6g, is untested. */
+int
+png_reset_zstream(png_structp png_ptr)
+{
+   return (inflateReset(&png_ptr->zstream));
 }
--- a/png.h
+++ b/png.h
--- a/png_ptr.h
+++ b/png_ptr.h
@@ -0,0 +1,221 @@
+struct png_struct_def
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf jmpbuf;            /* used in png_error */
+#endif
+   png_error_ptr error_fn;    /* function for printing errors and aborting */
+   png_error_ptr warning_fn;  /* function for printing warnings */
+   png_voidp error_ptr;       /* user supplied struct for error functions */
+   png_rw_ptr write_data_fn;  /* function for writing output data */
+   png_rw_ptr read_data_fn;   /* function for reading input data */
+   png_voidp io_ptr;          /* ptr to application struct for I/O functions*/
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+   png_user_transform_ptr read_user_transform_fn; /* user read transform */
+#endif
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   png_user_transform_ptr write_user_transform_fn; /* user write transform */
+#endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   png_voidp user_transform_ptr; /* user supplied struct for user transform */
+   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
+   png_byte user_transform_channels; /* channels in user transformed pixels */
+#endif
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+   png_voidp user_chunk_ptr;
+   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
+#endif
+
+   png_uint_32 mode;          /* tells us where we are in the PNG file */
+   png_uint_32 flags;         /* flags indicating various things to libpng */
+   png_uint_32 transformations; /* which transformations to perform */
+
+   z_stream zstream;          /* pointer to decompression structure (below) */
+   png_bytep zbuf;            /* buffer for zlib */
+   png_size_t zbuf_size;      /* size of zbuf */
+   int zlib_level;            /* holds zlib compression level */
+   int zlib_method;           /* holds zlib compression method */
+   int zlib_window_bits;      /* holds zlib compression window bits */
+   int zlib_mem_level;        /* holds zlib compression memory level */
+   int zlib_strategy;         /* holds zlib compression strategy */
+
+   png_uint_32 width;         /* width of image in pixels */
+   png_uint_32 height;        /* height of image in pixels */
+   png_uint_32 num_rows;      /* number of rows in current pass */
+   png_uint_32 usr_width;     /* width of row at start of write */
+   png_uint_32 rowbytes;      /* size of row in bytes */
+   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
+   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
+   png_uint_32 row_number;    /* current row in interlace pass */
+   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
+   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
+   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
+   png_bytep up_row;          /* buffer to save "up" row when filtering */
+   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
+   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
+   png_row_info row_info;     /* used for transformation routines */
+
+   png_uint_32 idat_size;     /* current IDAT size for read */
+   png_uint_32 crc;           /* current chunk CRC value */
+   png_colorp palette;        /* palette from the input file */
+   png_uint_16 num_palette;   /* number of color entries in palette */
+   png_uint_16 num_trans;     /* number of transparency values */
+   png_byte chunk_name[5];    /* null-terminated name of current chunk */
+   png_byte compression;      /* file compression type (always 0) */
+   png_byte filter;           /* file filter type (always 0) */
+   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
+   png_byte pass;             /* current interlace pass (0 - 6) */
+   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
+   png_byte color_type;       /* color type of file */
+   png_byte bit_depth;        /* bit depth of file */
+   png_byte usr_bit_depth;    /* bit depth of users row */
+   png_byte pixel_depth;      /* number of bits per pixel */
+   png_byte channels;         /* number of channels in file */
+   png_byte usr_channels;     /* channels at start of write */
+   png_byte sig_bytes;        /* magic bytes read/written from start of file */
+
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+   png_uint_16 filler;           /* filler bytes for pixel expansion */
+#endif
+
+#if defined(PNG_READ_bKGD_SUPPORTED)
+   png_byte background_gamma_type;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float background_gamma;
+#endif
+   png_color_16 background;   /* background color in screen gamma space */
+#  if defined(PNG_READ_GAMMA_SUPPORTED)
+     png_color_16 background_1; /* background normalized to gamma 1.0 */
+#  endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */
+#endif /* PNG_READ_bKGD_SUPPORTED */
+
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+   png_flush_ptr output_flush_fn;/* Function for flushing output */
+   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
+   png_uint_32 flush_rows;    /* number of rows written since last flush */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float gamma;          /* file gamma value */
+   float screen_gamma;   /* screen gamma value (display_exponent) */
+#endif
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
+   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
+   png_bytep gamma_to_1;      /* converts from file to 1.0 */
+   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
+   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
+   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED)
+   png_color_8 sig_bit;       /* significant bits in each available channel */
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
+   png_color_8 shift;         /* shift for significant bit tranformation */
+#endif
+
+#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
+ || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep trans;           /* transparency values for paletted files */
+   png_color_16 trans_values; /* transparency values for non-paletted files */
+#endif
+
+   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
+   png_write_status_ptr write_row_fn; /* called after each row is encoded */
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+   png_progressive_info_ptr info_fn; /* called after header data fully read */
+   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
+   png_progressive_end_ptr end_fn;   /* called after image is complete */
+   png_bytep save_buffer_ptr;        /* current location in save_buffer */
+   png_bytep save_buffer;            /* buffer for previously read data */
+   png_bytep current_buffer_ptr;     /* current location in current_buffer */
+   png_bytep current_buffer;         /* buffer for recently used data */
+   png_uint_32 push_length;          /* size of current input chunk */
+   png_uint_32 skip_length;          /* bytes to skip in input data */
+   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
+   png_size_t save_buffer_max;       /* total size of save_buffer */
+   png_size_t buffer_size;           /* total amount of available input data */
+   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
+   int process_mode;                 /* what push library is currently doing */
+   int cur_palette;                  /* current push library palette index */
+
+#  if defined(PNG_READ_TEXT_SUPPORTED)
+     png_size_t current_text_size;   /* current size of text input data */
+     png_size_t current_text_left;   /* how much text left to read in input */
+     png_charp current_text;         /* current text chunk buffer */
+     png_charp current_text_ptr;     /* current location in current_text */
+#  endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_TEXT_SUPPORTED */
+
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* for the Borland special 64K segment handler */
+   png_bytepp offset_table_ptr;
+   png_bytep offset_table;
+   png_uint_16 offset_table_number;
+   png_uint_16 offset_table_count;
+   png_uint_16 offset_table_count_free;
+#endif
+
+#if defined(PNG_READ_DITHER_SUPPORTED)
+   png_bytep palette_lookup;         /* lookup table for dithering */
+   png_bytep dither_index;           /* index translation for palette files */
+#endif
+
+#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED)
+   png_uint_16p hist;                /* histogram */
+#endif
+
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+   png_byte heuristic_method;        /* heuristic for row filter selection */
+   png_byte num_prev_filters;        /* number of weights for previous rows */
+   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
+   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
+   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
+   png_uint_16p filter_costs;        /* relative filter calculation cost */
+   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
+#endif
+
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+   png_charp time_buffer;            /* String to hold RFC 1123 time text */
+#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_voidp mem_ptr;                /* user supplied struct for mem functions */
+   png_malloc_ptr malloc_fn;         /* function for allocating memory */
+   png_free_ptr free_fn;             /* function for freeing memory */
+#endif
+
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+   png_byte rgb_to_gray_status;
+   png_uint_16 rgb_to_gray_red_coeff;
+   png_uint_16 rgb_to_gray_green_coeff;
+   png_uint_16 rgb_to_gray_blue_coeff;
+#endif
+
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+   png_byte empty_plte_permitted;
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+   int num_chunk_list;
+   png_bytep chunk_list;
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_fixed_point int_gamma;
+#endif
+
+   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
+};
--- a/pngasmrd.h
+++ b/pngasmrd.h
@@ -1,32 +1,35 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 2000
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
 *
 */

 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED

 /* Set this in the makefile for VC++ on Pentium, not in pngconf.h */
-#ifdef PNG_USE_PNGVCRD
 /* Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
 * MMX will be detected at run time and used if present.
 */
-#define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+#ifdef PNG_USE_PNGVCRD
+#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
+#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
+#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
 #endif

-/* Set this in the makefile for gcc on Pentium, not in pngconf.h */
-#ifdef PNG_USE_PNGGCCRD
-/* Platform must be Pentium.  Makefile must assemble and load pnggccrd.c
- * (not available in libpng 1.0.5h).
+/* Set this in the makefile for gcc/as on Pentium, not in pngconf.h */
+/* Platform must be Pentium.  Makefile must assemble and load pnggccrd.c .
 * MMX will be detected at run time and used if present.
 */
-#define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+#ifdef PNG_USE_PNGGCCRD
+#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
+#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
+#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
 #endif
+/*
+    GRR notes:
+      - see pnggccrd.c for info about what is currently enabled
+ */

 #endif
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,11 +1,11 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 /* Any machine specific code is near the front of this file, so if you
@@ -111,29 +111,35 @@
 #include <sys/types.h>
 #endif

+#ifndef PNG_SETJMP_NOT_SUPPORTED
+#  define PNG_SETJMP_SUPPORTED
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
 /* This is an attempt to force a single setjmp behaviour on Linux.  If
 * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
 */
-#ifdef __linux__
-#ifdef _BSD_SOURCE
-#define _PNG_SAVE_BSD_SOURCE
-#undef _BSD_SOURCE
-#endif
-#ifdef _SETJMP_H
-__png.h__ already includes setjmp.h
-__dont__ include it again
-#endif
+#  ifdef __linux__
+#    ifdef _BSD_SOURCE
+#      define _PNG_SAVE_BSD_SOURCE
+#      undef _BSD_SOURCE
+#    endif
+#    ifdef _SETJMP_H
+      __png.h__ already includes setjmp.h
+      __dont__ include it again
+#    endif
 #endif /* __linux__ */

 /* include setjmp.h for error handling */
 #include <setjmp.h>

-#ifdef __linux__
-#ifdef _PNG_SAVE_BSD_SOURCE
-#define _BSD_SOURCE
-#undef _PNG_SAVE_BSD_SOURCE
-#endif
-#endif /* __linux__ */
+#  ifdef __linux__
+#    ifdef _PNG_SAVE_BSD_SOURCE
+#      define _BSD_SOURCE
+#      undef _PNG_SAVE_BSD_SOURCE
+#    endif
+#  endif /* __linux__ */
+#endif /* PNG_SETJMP_SUPPORTED */

 #ifdef BSD
 #include <strings.h>
@@ -158,6 +164,7 @@ __dont__ include it again
 * them inside an appropriate ifdef/endif pair for portability.
 */

+#if !defined(PNG_NO_FLOATING_POINT_SUPPORTED)
 #if defined(MACOS)
 /* We need to check that <math.h> hasn't already been included earlier
 * as it seems it doesn't agree with <fp.h>, yet we should really use
@@ -169,6 +176,7 @@ __dont__ include it again
 #else
 #include <math.h>
 #endif
+#endif

 /* Codewarrior on NT has linking problems without this. */
 #if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
@@ -247,7 +255,7 @@ __dont__ include it again
 * things to happen if the library and/or application ever change.
 */

-/* Any transformations you will not be using can be undef'ed here */
+/* Any features you will not be using can be undef'ed here */

 /* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
   to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
@@ -259,7 +267,13 @@ __dont__ include it again
   1.0.1c, for consistency)
 */

+#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
+#define PNG_FLOATING_POINT_SUPPORTED
+#endif

+#ifndef PNG_NO_FIXED_POINT_SUPPORTED
+#define PNG_FIXED_POINT_SUPPORTED
+#endif

 #if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
    !defined(PNG_NO_READ_TRANSFORMS)
@@ -379,7 +393,8 @@ __dont__ include it again
                                            encoders, but can cause trouble
                                            if left undefined */

-#ifndef PNG_NO_WRITE_WEIGHTED_FILTER
+#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
+     defined(PNG_FLOATING_POINT_SUPPORTED)
 #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
 #endif

@@ -415,26 +430,24 @@ __dont__ include it again
 #define PNG_EASY_ACCESS_SUPPORTED
 #endif

-#ifndef PNG_NO_ASSEMBLER_CODE
+#if defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD) && \
+  !defined(PNG_NO_ASSEMBLER_CODE)
 #define PNG_ASSEMBLER_CODE_SUPPORTED
 #endif

-#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
-#define PNG_FLOATING_POINT_SUPPORTED
-#endif
-
-#ifndef PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_FIXED_POINT_SUPPORTED
-#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.
 */
 #ifdef PNG_NO_GLOBAL_ARRAYS
-#define PNG_USE_LOCAL_ARRAYS
+#  define PNG_USE_LOCAL_ARRAYS
 #else
-#define PNG_USE_GLOBAL_ARRAYS
+#  if defined(__GNUC__) && defined(WIN32)
+#    define PNG_NO_GLOBAL_ARRAYS
+#    define PNG_USE_LOCAL_ARRAYS
+#  else
+#    define PNG_USE_GLOBAL_ARRAYS
+#  endif
 #endif

 /* These are currently experimental features, define them if you want */
@@ -473,209 +486,246 @@ __dont__ include it again
 #endif

 #ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+
+#ifdef PNG_NO_READ_TEXT
+#  define PNG_NO_READ_iTXt
+#  define PNG_NO_READ_tEXt
+#  define PNG_NO_READ_zTXt
+#endif
 #ifndef PNG_NO_READ_bKGD
-#define PNG_READ_bKGD_SUPPORTED
-#define PNG_bKGD_SUPPORTED
+#  define PNG_READ_bKGD_SUPPORTED
+#  define PNG_bKGD_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_cHRM
-#define PNG_READ_cHRM_SUPPORTED
-#define PNG_cHRM_SUPPORTED
+#  define PNG_READ_cHRM_SUPPORTED
+#  define PNG_cHRM_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_gAMA
-#define PNG_READ_gAMA_SUPPORTED
-#define PNG_gAMA_SUPPORTED
+#  define PNG_READ_gAMA_SUPPORTED
+#  define PNG_gAMA_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_hIST
-#define PNG_READ_hIST_SUPPORTED
-#define PNG_hIST_SUPPORTED
+#  define PNG_READ_hIST_SUPPORTED
+#  define PNG_hIST_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_iCCP
-#define PNG_READ_iCCP_SUPPORTED
-#define PNG_iCCP_SUPPORTED
+#  define PNG_READ_iCCP_SUPPORTED
+#  define PNG_iCCP_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_iTXt
-#define PNG_READ_iTXt_SUPPORTED
-#define PNG_iTXt_SUPPORTED
+#  define PNG_READ_iTXt_SUPPORTED
+#  define PNG_iTXt_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_oFFs
-#define PNG_READ_oFFs_SUPPORTED
-#define PNG_oFFs_SUPPORTED
+#  define PNG_READ_oFFs_SUPPORTED
+#  define PNG_oFFs_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_pCAL
-#define PNG_READ_pCAL_SUPPORTED
-#define PNG_pCAL_SUPPORTED
+#  define PNG_READ_pCAL_SUPPORTED
+#  define PNG_pCAL_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_sCAL
-#define PNG_READ_sCAL_SUPPORTED
-#define PNG_sCAL_SUPPORTED
+#  define PNG_READ_sCAL_SUPPORTED
+#  define PNG_sCAL_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_pHYs
-#define PNG_READ_pHYs_SUPPORTED
-#define PNG_pHYs_SUPPORTED
+#  define PNG_READ_pHYs_SUPPORTED
+#  define PNG_pHYs_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_sBIT
-#define PNG_READ_sBIT_SUPPORTED
-#define PNG_sBIT_SUPPORTED
+#  define PNG_READ_sBIT_SUPPORTED
+#  define PNG_sBIT_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_sPLT
-#define PNG_READ_sPLT_SUPPORTED
-#define PNG_sPLT_SUPPORTED
+#  define PNG_READ_sPLT_SUPPORTED
+#  define PNG_sPLT_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_sRGB
-#define PNG_READ_sRGB_SUPPORTED
-#define PNG_sRGB_SUPPORTED
+#  define PNG_READ_sRGB_SUPPORTED
+#  define PNG_sRGB_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_tEXt
-#define PNG_READ_tEXt_SUPPORTED
-#define PNG_tEXt_SUPPORTED
+#  define PNG_READ_tEXt_SUPPORTED
+#  define PNG_tEXt_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_tIME
-#define PNG_READ_tIME_SUPPORTED
-#define PNG_tIME_SUPPORTED
+#  define PNG_READ_tIME_SUPPORTED
+#  define PNG_tIME_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_tRNS
-#define PNG_READ_tRNS_SUPPORTED
-#define PNG_tRNS_SUPPORTED
+#  define PNG_READ_tRNS_SUPPORTED
+#  define PNG_tRNS_SUPPORTED
 #endif
 #ifndef PNG_NO_READ_zTXt
-#define PNG_READ_zTXt_SUPPORTED
-#define PNG_zTXt_SUPPORTED
+#  define PNG_READ_zTXt_SUPPORTED
+#  define PNG_zTXt_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_USER_CHUNKS
+#  define PNG_READ_USER_CHUNKS_SUPPORTED
+#  define PNG_USER_CHUNKS_SUPPORTED
+#  ifdef PNG_NO_READ_UNKNOWN_CHUNKS
+#    undef PNG_NO_READ_UNKNOWN_CHUNKS
+#  endif
+#  ifdef PNG_NO_HANDLE_AS_UNKNOWN
+#    undef PNG_NO_HANDLE_AS_UNKNOWN
+#  endif
 #endif
 #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
-#define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+#  define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_READ_OPT_PLTE
-#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
-#endif                              /* PLTE chunk in RGB and RGBA images */
+#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif                      /* optional PLTE chunk in RGB and RGBA images */
 #if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
  defined(PNG_READ_zTXt_SUPPORTED)
-#define PNG_READ_TEXT_SUPPORTED
-#define PNG_TEXT_SUPPORTED
+#  define PNG_READ_TEXT_SUPPORTED
+#  define PNG_TEXT_SUPPORTED
 #endif
 #endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */

 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
-#ifndef PNG_NO_WRITE_bKGD
-#define PNG_WRITE_bKGD_SUPPORTED
-#ifndef PNG_bKGD_SUPPORTED
-#  define PNG_bKGD_SUPPORTED
+#ifdef PNG_NO_WRITE_TEXT
+#  define PNG_NO_WRITE_iTXt
+#  define PNG_NO_WRITE_tEXt
+#  define PNG_NO_WRITE_zTXt
 #endif
+#ifndef PNG_NO_WRITE_bKGD
+#  define PNG_WRITE_bKGD_SUPPORTED
+#  ifndef PNG_bKGD_SUPPORTED
+#    define PNG_bKGD_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_cHRM
-#define PNG_WRITE_cHRM_SUPPORTED
-#ifndef PNG_cHRM_SUPPORTED
-#  define PNG_cHRM_SUPPORTED
-#endif
+#  define PNG_WRITE_cHRM_SUPPORTED
+#  ifndef PNG_cHRM_SUPPORTED
+#    define PNG_cHRM_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_gAMA
-#define PNG_WRITE_gAMA_SUPPORTED
-#ifndef PNG_gAMA_SUPPORTED
-#  define PNG_gAMA_SUPPORTED
-#endif
+#  define PNG_WRITE_gAMA_SUPPORTED
+#  ifndef PNG_gAMA_SUPPORTED
+#    define PNG_gAMA_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_hIST
-#define PNG_WRITE_hIST_SUPPORTED
-#ifndef PNG_hIST_SUPPORTED
-#  define PNG_hIST_SUPPORTED
-#endif
+#  define PNG_WRITE_hIST_SUPPORTED
+#  ifndef PNG_hIST_SUPPORTED
+#    define PNG_hIST_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_iCCP
-#define PNG_WRITE_iCCP_SUPPORTED
-#ifndef PNG_iCCP_SUPPORTED
-#  define PNG_iCCP_SUPPORTED
-#endif
+#  define PNG_WRITE_iCCP_SUPPORTED
+#  ifndef PNG_iCCP_SUPPORTED
+#    define PNG_iCCP_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_iTXt
-#define PNG_WRITE_iTXt_SUPPORTED
-#ifndef PNG_iTXt_SUPPORTED
-#  define PNG_iTXt_SUPPORTED
-#endif
+#  define PNG_WRITE_iTXt_SUPPORTED
+#  ifndef PNG_iTXt_SUPPORTED
+#    define PNG_iTXt_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_oFFs
-#define PNG_WRITE_oFFs_SUPPORTED
-#ifndef PNG_oFFs_SUPPORTED
-#  define PNG_oFFs_SUPPORTED
-#endif
+#  define PNG_WRITE_oFFs_SUPPORTED
+#  ifndef PNG_oFFs_SUPPORTED
+#    define PNG_oFFs_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_pCAL
-#define PNG_WRITE_pCAL_SUPPORTED
-#ifndef PNG_pCAL_SUPPORTED
-#  define PNG_pCAL_SUPPORTED
-#endif
+#  define PNG_WRITE_pCAL_SUPPORTED
+#  ifndef PNG_pCAL_SUPPORTED
+#    define PNG_pCAL_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_sCAL
-#define PNG_WRITE_sCAL_SUPPORTED
-#ifndef PNG_sCAL_SUPPORTED
-#  define PNG_sCAL_SUPPORTED
-#endif
+#  define PNG_WRITE_sCAL_SUPPORTED
+#  ifndef PNG_sCAL_SUPPORTED
+#    define PNG_sCAL_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_pHYs
-#define PNG_WRITE_pHYs_SUPPORTED
-#ifndef PNG_pHYs_SUPPORTED
-#  define PNG_pHYs_SUPPORTED
-#endif
+#  define PNG_WRITE_pHYs_SUPPORTED
+#  ifndef PNG_pHYs_SUPPORTED
+#    define PNG_pHYs_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_sBIT
-#define PNG_WRITE_sBIT_SUPPORTED
-#ifndef PNG_sBIT_SUPPORTED
-#  define PNG_sBIT_SUPPORTED
-#endif
+#  define PNG_WRITE_sBIT_SUPPORTED
+#  ifndef PNG_sBIT_SUPPORTED
+#    define PNG_sBIT_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_sPLT
-#define PNG_WRITE_sPLT_SUPPORTED
-#ifndef PNG_sPLT_SUPPORTED
-#  define PNG_sPLT_SUPPORTED
-#endif
+#  define PNG_WRITE_sPLT_SUPPORTED
+#  ifndef PNG_sPLT_SUPPORTED
+#    define PNG_sPLT_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_sRGB
-#define PNG_WRITE_sRGB_SUPPORTED
-#ifndef PNG_sRGB_SUPPORTED
-#  define PNG_sRGB_SUPPORTED
-#endif
+#  define PNG_WRITE_sRGB_SUPPORTED
+#  ifndef PNG_sRGB_SUPPORTED
+#    define PNG_sRGB_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_tEXt
-#define PNG_WRITE_tEXt_SUPPORTED
-#ifndef PNG_tEXt_SUPPORTED
-#  define PNG_tEXt_SUPPORTED
-#endif
+#  define PNG_WRITE_tEXt_SUPPORTED
+#  ifndef PNG_tEXt_SUPPORTED
+#    define PNG_tEXt_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_tIME
-#define PNG_WRITE_tIME_SUPPORTED
-#ifndef PNG_tIME_SUPPORTED
-#  define PNG_tIME_SUPPORTED
-#endif
+#  define PNG_WRITE_tIME_SUPPORTED
+#  ifndef PNG_tIME_SUPPORTED
+#    define PNG_tIME_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_tRNS
-#define PNG_WRITE_tRNS_SUPPORTED
-#ifndef PNG_tRNS_SUPPORTED
-#  define PNG_tRNS_SUPPORTED
-#endif
+#  define PNG_WRITE_tRNS_SUPPORTED
+#  ifndef PNG_tRNS_SUPPORTED
+#    define PNG_tRNS_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_zTXt
-#define PNG_WRITE_zTXt_SUPPORTED
-#ifndef PNG_zTXt_SUPPORTED
-#  define PNG_zTXt_SUPPORTED
-#endif
+#  define PNG_WRITE_zTXt_SUPPORTED
+#  ifndef PNG_zTXt_SUPPORTED
+#    define PNG_zTXt_SUPPORTED
+#  endif
 #endif
 #ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
-#define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
-#  define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#endif
+#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  endif
+#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#     endif
+#  endif
 #endif
 #if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
  defined(PNG_WRITE_zTXt_SUPPORTED)
-#define PNG_WRITE_TEXT_SUPPORTED
-#ifndef PNG_TEXT_SUPPORTED
-#  define PNG_TEXT_SUPPORTED
-#endif
+#  define PNG_WRITE_TEXT_SUPPORTED
+#  ifndef PNG_TEXT_SUPPORTED
+#    define PNG_TEXT_SUPPORTED
+#  endif
 #endif
 #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */

+/* Turn this off to disable png_read_png() and
+ * png_write_png() and leave the row_pointers member
+ * out of the info structure.
+ */
+#ifndef PNG_NO_INFO_IMAGE
+#  define PNG_INFO_IMAGE_SUPPORTED
+#endif
+
 /* need the time information for reading tIME chunks */
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-#include <time.h>
+#if defined(PNG_tIME_SUPPORTED)
+#  include <time.h>
 #endif

 /* Some typedefs to get us started.  These should be safe on most of the
@@ -758,6 +808,10 @@ typedef size_t png_size_t;
 #define FARDATA
 #endif

+/* Typedef for floating-point numbers that are converted
+   to fixed-point with a multiple of 100,000, e.g., int_gamma */
+typedef png_int_32 png_fixed_point;
+
 /* Add typedefs for pointers */
 typedef void            FAR * png_voidp;
 typedef png_byte        FAR * png_bytep;
@@ -767,6 +821,7 @@ typedef png_uint_16     FAR * png_uint_16p;
 typedef png_int_16      FAR * png_int_16p;
 typedef PNG_CONST char  FAR * png_const_charp;
 typedef char            FAR * png_charp;
+typedef png_fixed_point FAR * png_fixed_point_p;
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 typedef double          FAR * png_doublep;
 #endif
@@ -779,6 +834,7 @@ typedef png_uint_16     FAR * FAR * png_uint_16pp;
 typedef png_int_16      FAR * FAR * png_int_16pp;
 typedef PNG_CONST char  FAR * FAR * png_const_charpp;
 typedef char            FAR * FAR * png_charpp;
+typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 typedef double          FAR * FAR * png_doublepp;
 #endif
@@ -796,8 +852,13 @@ typedef z_stream FAR *  png_zstreamp;


 #ifndef PNG_EXPORT
-   /* allow for compilation as dll under MS Windows */
-#  ifdef __WIN32DLL__
+   /* GRR 20000206:  based on zconf.h and MSVC 5.0 docs */
+#  if defined(_MSC_VER) && defined(_DLL)
+#    define PNG_EXPORT(type,symbol)        type __declspec(dllexport) symbol
+#  endif
+
+   /* allow for compilation as a DLL under MS Windows */
+#  ifdef __WIN32DLL__	/* Borland? */
 #    define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol
 #  endif

@@ -806,7 +867,7 @@ typedef z_stream FAR *  png_zstreamp;
 #    define PNG_EXPORT(type,symbol) type __attribute__((dllexport)) symbol
 #  endif

-   /* allow for compilation as dll with Borland C++ 5.0 */
+   /* allow for compilation as a DLL with Borland C++ 5.0 */
 #  if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
 #    define PNG_EXPORT(type,symbol) type _export symbol
 #  endif
@@ -826,6 +887,9 @@ typedef z_stream FAR *  png_zstreamp;
 #endif

 #ifndef PNG_EXPORT_VAR
+#  if defined(_MSC_VER) && defined(_DLL)	/* GRR 20000206 */
+#    define PNG_EXPORT_VAR(type) extern type __declspec(dllexport)
+#  endif
 #  ifdef PNG_DECL_DLLEXP
 #    define PNG_EXPORT_VAR(type) extern __declspec(dllexport) type
 #  endif
@@ -848,6 +912,17 @@ typedef z_stream FAR *  png_zstreamp;
 * that are passed far data must be model independent.
 */

+#ifndef PNG_ABORT
+#   define PNG_ABORT() abort()
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+#   define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#else
+#   define png_jmpbuf(png_ptr) \
+    (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
+#endif
+
 #if defined(USE_FAR_KEYWORD)  /* memory model independent fns */
 /* use this to make far-to-near assignments */
 #   define CHECK   1
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,11 +1,11 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file provides a location for all error handling.  Users who
 * need special error handling are expected to write replacement functions
@@ -67,21 +67,26 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
 {
   int iout = 0, iin = 0;

-   while (iin < 4) {
+   while (iin < 4)
+   {
      int c = png_ptr->chunk_name[iin++];
-      if (isnonalpha(c)) {
+      if (isnonalpha(c))
+      {
         buffer[iout++] = '[';
         buffer[iout++] = png_digit[(c & 0xf0) >> 4];
-         buffer[iout++] = png_digit[c & 0xf];
+         buffer[iout++] = png_digit[c & 0x0f];
         buffer[iout++] = ']';
-      } else {
+      }
+      else
+      {
         buffer[iout++] = (png_byte)c;
      }
   }

   if (message == NULL)
      buffer[iout] = 0;
-   else {
+   else
+   {
      buffer[iout++] = ':';
      buffer[iout++] = ' ';
      png_memcpy(buffer+iout, message, 64);
@@ -117,14 +122,20 @@ png_default_error(png_structp png_ptr, png_const_charp message)
   fprintf(stderr, "libpng error: %s\n", message);
 #endif

-#ifdef USE_FAR_KEYWORD
+#ifdef PNG_SETJMP_SUPPORTED
+#  ifdef USE_FAR_KEYWORD
   {
      jmp_buf jmpbuf;
      png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
      longjmp(jmpbuf, 1);
   }
-#else
+#  else
   longjmp(png_ptr->jmpbuf, 1);
+# endif
+#else
+   if (png_ptr == NULL)
+     /* make compiler happy */ ;
+   PNG_ABORT();
 #endif
 }

--- a/pnggccrd.c
+++ b/pnggccrd.c
--- a/pngget.c
+++ b/pngget.c
@@ -1,11 +1,11 @@

 /* pngget.c - retrieval of values from info struct
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 #define PNG_INTERNAL
@@ -29,6 +29,17 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
      return(0);
 }

+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+png_bytepp
+png_get_rows(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->row_pointers);
+   else
+      return(0);
+}
+#endif
+
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* easy access to info, added in libpng-0.99 */
 png_uint_32
@@ -239,35 +250,35 @@ png_uint_32
 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
   return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5);
 }

 png_uint_32
 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
   return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5);
 }

 png_uint_32
 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
   return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5);
 }

 float
 png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
   return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937);
 }

 float
 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
   return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937)
 }

 #if defined(PNG_READ_pHYs_SUPPORTED)
@@ -277,7 +288,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
 {
   png_uint_32 retval = 0;

-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
   {
      png_debug1(1, "in %s retrieval function\n", "pHYs");
      if (res_x != NULL)
@@ -296,15 +307,15 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
         retval |= PNG_INFO_pHYs;
         if(unit_type == 1)
         {
-            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
-            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
+            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
+            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
         }
      }
   }
   return (retval);
 }
 #endif /* PNG_READ_pHYs_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS $$ PNG_FLOATING_POINT_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */

 /* png_get_channels really belongs in here, too, but it's been around longer */

@@ -378,9 +389,9 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32
 png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 *white_x, png_uint_32 *white_y, png_uint_32 *red_x,
-   png_uint_32 *red_y, png_uint_32 *green_x, png_uint_32 *green_y,
-   png_uint_32 *blue_x, png_uint_32 *blue_y)
+   png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
+   png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
+   png_fixed_point *blue_x, png_fixed_point *blue_y)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
   {
@@ -423,10 +434,9 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
   return (0);
 }
 #endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32
 png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
-    png_uint_32 *int_file_gamma)
+    png_fixed_point *int_file_gamma)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
      && int_file_gamma != NULL)
@@ -438,7 +448,6 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
   return (0);
 }
 #endif
-#endif

 #if defined(PNG_READ_sRGB_SUPPORTED)
 png_uint_32
@@ -459,7 +468,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 png_uint_32
 png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
             png_charpp name, int *compression_type,
-             png_charpp profile, png_int_32 *proflen)
+             png_charpp profile, png_uint_32 *proflen)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
      && name != NULL && profile != NULL && proflen != NULL)
@@ -477,10 +486,10 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
 }
 #endif

-#if defined(PNG_READ_sPLT_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
+#if defined(PNG_READ_sPLT_SUPPORTED)
 png_uint_32
-png_get_spalettes(png_structp png_ptr, png_infop info_ptr,
-             png_spalette_pp spalettes)
+png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+             png_sPLT_tpp spalettes)
 {
   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
     *spalettes = info_ptr->splt_palettes;
@@ -573,8 +582,8 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
   png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
   png_charp *units, png_charpp *params)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
-      purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
+      && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
      nparams != NULL && units != NULL && params != NULL)
   {
      png_debug1(1, "in %s retrieval function\n", "pCAL");
@@ -595,9 +604,10 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32
 png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
-             png_charpp unit, double *width, double *height)
+             int *unit, double *width, double *height)
 {
-    if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sCAL)
+    if (png_ptr != NULL && info_ptr != NULL &&
+       (info_ptr->valid & PNG_INFO_sCAL))
    {
        *unit = info_ptr->scal_unit;
        *width = info_ptr->scal_pixel_width;
@@ -606,12 +616,14 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
    }
    return(0);
 }
-#endif
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32
 png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
-             png_charpp unit, png_charpp width, png_charpp height)
+             int *unit, png_charpp width, png_charpp height)
 {
-    if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sCAL)
+    if (png_ptr != NULL && info_ptr != NULL &&
+       (info_ptr->valid & PNG_INFO_sCAL))
    {
        *unit = info_ptr->scal_unit;
        *width = info_ptr->scal_s_width;
@@ -621,6 +633,8 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
    return(0);
 }
 #endif
+#endif
+#endif

 #if defined(PNG_READ_pHYs_SUPPORTED)
 png_uint_32
@@ -629,7 +643,8 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 {
   png_uint_32 retval = 0;

-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL &&
+      (info_ptr->valid & PNG_INFO_pHYs))
   {
      png_debug1(1, "in %s retrieval function\n", "pHYs");
      if (res_x != NULL)
@@ -656,8 +671,8 @@ png_uint_32
 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
   int *num_palette)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
-       palette != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
+       && palette != NULL)
   {
      png_debug1(1, "in %s retrieval function\n", "PLTE");
      *palette = info_ptr->palette;
@@ -672,8 +687,8 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
 png_uint_32
 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
-       sig_bit != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
+      && sig_bit != NULL)
   {
      png_debug1(1, "in %s retrieval function\n", "sBIT");
      *sig_bit = &(info_ptr->sig_bit);
@@ -699,6 +714,8 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
         *num_text = info_ptr->num_text;
      return ((png_uint_32)info_ptr->num_text);
   }
+   if (num_text != NULL)
+     *num_text = 0;
   return(0);
 }
 #endif
@@ -707,8 +724,8 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
 png_uint_32
 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
-       mod_time != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
+       && mod_time != NULL)
   {
      png_debug1(1, "in %s retrieval function\n", "tIME");
      *mod_time = &(info_ptr->mod_time);
@@ -724,7 +741,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
   png_bytep *trans, int *num_trans, png_color_16p *trans_values)
 {
   png_uint_32 retval = 0;
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
   {
      png_debug1(1, "in %s retrieval function\n", "tRNS");
      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
@@ -775,3 +792,18 @@ png_get_rgb_to_gray_status (png_structp png_ptr)
   return png_ptr->rgb_to_gray_status;
 }
 #endif
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+png_voidp
+png_get_user_chunk_ptr(png_structp png_ptr)
+{
+   return (png_ptr->user_chunk_ptr);
+}
+#endif
+
+
+png_uint_32
+png_get_compression_buffer_size(png_structp png_ptr)
+{
+   return(png_ptr->zbuf_size);
+}
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,11 +1,11 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file provides a location for all memory allocation.  Users who
 * need special memory handling are expected to supply replacement
--- a/pngnow.png
+++ b/pngnow.png
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,11 +1,11 @@

 /* pngpread.c - read a png file in push mode
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 #define PNG_INTERNAL
@@ -151,27 +151,30 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_hIST_SUPPORTED)
      PNG_hIST;
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      PNG_iTXt;
+#endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
      PNG_oFFs;
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
      PNG_pCAL;
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_sCAL;
-#endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
      PNG_pHYs;
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
      PNG_sBIT;
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      PNG_sCAL;
+#endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
      PNG_sRGB;
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_iCCP;
-#endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
      PNG_sPLT;
 #endif
@@ -447,7 +450,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
   }
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+   else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
   {
      png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
   }
@@ -949,7 +952,7 @@ png_read_push_finish_row(png_structp png_ptr)
 void
 png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place tEXt");
         /* to quiet some compiler warnings */
@@ -1023,6 +1026,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
      text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
      text_ptr->lang = (char *)NULL;
      text_ptr->key = key;
+      text_ptr->lang_key = (char *)NULL;
      text_ptr->text = text;

      png_set_text(png_ptr, info_ptr, text_ptr, 1);
@@ -1036,7 +1040,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
 void
 png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place zTXt");
         /* to quiet some compiler warnings */
@@ -1201,8 +1205,9 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
      text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
-      text_ptr->lang = (char *)NULL;
      text_ptr->key = key;
+      text_ptr->lang = (char *)NULL;
+      text_ptr->lang_key = (char *)NULL;
      text_ptr->text = text;

      png_set_text(png_ptr, info_ptr, text_ptr, 1);
@@ -1216,7 +1221,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
 void
 png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place iTXt");
         /* to quiet some compiler warnings */
@@ -1246,6 +1251,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
 void
 png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
 {
+
   if (png_ptr->buffer_size && png_ptr->current_text_left)
   {
      png_size_t text_size;
@@ -1261,9 +1267,11 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
   if (!(png_ptr->current_text_left))
   {
      png_textp text_ptr;
-      png_charp text;
-      png_charp lang;
      png_charp key;
+      int comp_flag;
+      png_charp lang;
+      png_charp lang_key;
+      png_charp text;

      if (png_ptr->buffer_size < 4)
      {
@@ -1278,26 +1286,36 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
         return;
 #endif

-      lang = png_ptr->current_text;
+      key = png_ptr->current_text;
      png_ptr->current_text = 0;

-      for (key = lang; *key; key++)
+      for (lang = key; *lang; lang++)
         /* empty loop */ ;

-      if (key != lang + png_ptr->current_text_size)
-         key++;
+      if (lang != key + png_ptr->current_text_size)
+         lang++;

-      for (text = key; *text; text++)
+      comp_flag = *lang++;
+      lang++;     /* skip comp_type, always zero */
+
+      for (lang_key = lang; *lang_key; lang_key++)
+         /* empty loop */ ;
+      lang_key++;        /* skip NUL separator */
+
+      for (text = lang_key; *text; text++)
         /* empty loop */ ;

      if (text != key + png_ptr->current_text_size)
         text++;

      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
-      text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
-      text_ptr->lang = lang;
+      text_ptr->compression = comp_flag + 2;
      text_ptr->key = key;
+      text_ptr->lang = lang;
+      text_ptr->lang_key = lang_key;
      text_ptr->text = text;
+      text_ptr->text_length = 0;
+      text_ptr->itxt_length = png_strlen(text);

      png_set_text(png_ptr, info_ptr, text_ptr, 1);

@@ -1307,25 +1325,70 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
 #endif

 /* This function is called when we haven't found a handler for this
- * chunk.  In the future we will have code here that can handle
- * user-defined callback functions for unknown chunks before they are
- * ignored or cause an error.  If there isn't a problem with the
- * chunk itself (ie a bad chunk name or a critical chunk), the chunk
- * is (currently) silently ignored.
+ * chunk.  If there isn't a problem with the chunk itself (ie a bad chunk
+ * name or a critical chunk), the chunk is (currently) silently ignored.
 */
 void
 png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
+   png_uint_32 skip=0;
   png_check_chunk_name(png_ptr, png_ptr->chunk_name);

   if (!(png_ptr->chunk_name[0] & 0x20))
   {
-      png_chunk_error(png_ptr, "unknown critical chunk");
-      /* to quiet some compiler warnings */
-      if(info_ptr == NULL) return;
+      if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+           HANDLE_CHUNK_ALWAYS
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+           && png_ptr->read_user_chunk_fn == (png_user_chunk_ptr)NULL
+#endif
+         )
+         png_chunk_error(png_ptr, "unknown critical chunk");
+
+      /* to quiet compiler warnings about unused info_ptr */
+      if (info_ptr == NULL)
+         return;
   }

-   png_push_crc_skip(png_ptr, length);
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+   if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+   {
+       png_unknown_chunk chunk;
+
+#ifdef PNG_MAX_MALLOC_64K
+       if (length > (png_uint_32)65535L)
+       {
+           png_warning(png_ptr, "unknown chunk too large to fit in memory");
+           skip = length - (png_uint_32)65535L;
+           length = (png_uint_32)65535L;
+       }
+#endif
+
+       strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+       chunk.data = (png_bytep)png_malloc(png_ptr, length);
+       png_crc_read(png_ptr, chunk.data, length);
+       chunk.size = length;
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+       if(png_ptr->read_user_chunk_fn != (png_user_chunk_ptr)NULL)
+       {
+          /* callback to user unknown chunk handler */
+          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+          {
+             if (!(png_ptr->chunk_name[0] & 0x20))
+                if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+                     HANDLE_CHUNK_ALWAYS)
+                   png_chunk_error(png_ptr, "unknown critical chunk");
+          }
+             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+       }
+       else
+#endif
+          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+       png_free(png_ptr, chunk.data);
+   }
+   else
+#endif
+      skip=length;
+   png_push_crc_skip(png_ptr, skip);
 }

 void
--- a/pngread.c
+++ b/pngread.c
@@ -1,11 +1,11 @@

 /* pngread.c - read a PNG file
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file contains routines that an application calls directly to
 * read a PNG file or stream.
@@ -34,9 +34,13 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif /* PNG_USER_MEM_SUPPORTED */

   png_structp png_ptr;
+
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
   jmp_buf jmpbuf;
 #endif
+#endif
+
   png_debug(1, "in png_create_read_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
   if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
@@ -47,6 +51,8 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   {
      return (png_structp)NULL;
   }
+
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
   if (setjmp(jmpbuf))
 #else
@@ -60,6 +66,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #ifdef USE_FAR_KEYWORD
   png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
 #endif
+#endif

 #ifdef PNG_USER_MEM_SUPPORTED
   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
@@ -110,17 +117,24 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 void
 png_read_init(png_structp png_ptr)
 {
+#ifdef PNG_SETJMP_SUPPORTED
   jmp_buf tmp_jmp;  /* to save current jump buffer */
+#endif

   png_debug(1, "in png_read_init\n");
+
+#ifdef PNG_SETJMP_SUPPORTED
   /* save jump buffer and error functions */
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif

   /* reset all variables to 0 */
   png_memset(png_ptr, 0, sizeof (png_struct));

+#ifdef PNG_SETJMP_SUPPORTED
   /* restore jump buffer */
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif

   /* initialize zbuf - compression buffer */
   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@@ -214,7 +228,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_sBIT_SUPPORTED)
      PNG_sBIT;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_READ_sCAL_SUPPORTED)
      PNG_sCAL;
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
@@ -253,10 +267,29 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       */
      if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
         png_handle_IHDR(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
-         png_handle_PLTE(png_ptr, info_ptr, length);
      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
         png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      {
+         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+            png_ptr->mode |= PNG_HAVE_IDAT;
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+         else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         {
+            if (!(png_ptr->mode & PNG_HAVE_IHDR))
+               png_error(png_ptr, "Missing IHDR before IDAT");
+            else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+                     !(png_ptr->mode & PNG_HAVE_PLTE))
+               png_error(png_ptr, "Missing PLTE before IDAT");
+            break;
+         }
+      }
+#endif
+      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+         png_handle_PLTE(png_ptr, info_ptr, length);
      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
      {
         if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -421,7 +454,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
      switch (png_ptr->pass)
      {
         case 0:
-            if (png_ptr->row_number & 7)
+            if (png_ptr->row_number & 0x07)
            {
               if (dsp_row != NULL)
                  png_combine_row(png_ptr, dsp_row,
@@ -431,7 +464,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
            }
            break;
         case 1:
-            if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
            {
               if (dsp_row != NULL)
                  png_combine_row(png_ptr, dsp_row,
@@ -441,7 +474,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
            }
            break;
         case 2:
-            if ((png_ptr->row_number & 7) != 4)
+            if ((png_ptr->row_number & 0x07) != 4)
            {
               if (dsp_row != NULL && (png_ptr->row_number & 4))
                  png_combine_row(png_ptr, dsp_row,
@@ -546,6 +579,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
   png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
      (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);

+   if(png_ptr->row_buf[0])
   png_read_filter_row(png_ptr, &(png_ptr->row_info),
      png_ptr->row_buf + 1, png_ptr->prev_row + 1,
      (int)(png_ptr->row_buf[0]));
@@ -607,7 +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 1.0.5h.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6h.
 */

 void
@@ -656,7 +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 1.0.5h.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6h.
 */
 void
 png_read_image(png_structp png_ptr, png_bytepp image)
@@ -743,7 +777,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_sBIT_SUPPORTED)
      PNG_sBIT;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_READ_sCAL_SUPPORTED)
      PNG_sCAL;
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
@@ -776,6 +810,23 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)

      if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
         png_handle_IHDR(png_ptr, info_ptr, length);
+      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+         png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      {
+         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         {
+            if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+               png_error(png_ptr, "Too many IDAT's found");
+         }
+         else
+            png_ptr->mode |= PNG_AFTER_IDAT;
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+      }
+#endif
      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
      {
         /* Zero length IDATs are legal after the last IDAT has been
@@ -783,13 +834,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
          */
         if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
            png_error(png_ptr, "Too many IDAT's found");
-         else
-            png_crc_finish(png_ptr, 0);
+         png_crc_finish(png_ptr, length);
      }
      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
         png_handle_PLTE(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
-         png_handle_IEND(png_ptr, info_ptr, length);
 #if defined(PNG_READ_bKGD_SUPPORTED)
      else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
         png_handle_bKGD(png_ptr, info_ptr, length);
@@ -894,7 +942,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   if (info_ptr != NULL)
   {
 #if defined(PNG_TEXT_SUPPORTED)
-      png_free(png_ptr, info_ptr->text);
+      png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
 #endif

 #ifdef PNG_USER_MEM_SUPPORTED
@@ -908,7 +956,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   if (end_info_ptr != NULL)
   {
 #if defined(PNG_READ_TEXT_SUPPORTED)
-      png_free(png_ptr, end_info_ptr->text);
+      png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
 #endif
 #ifdef PNG_USER_MEM_SUPPORTED
      png_destroy_struct_2((png_voidp)end_info_ptr, free_fn);
@@ -933,7 +981,9 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 void
 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
 {
+#ifdef PNG_SETJMP_SUPPORTED
   jmp_buf tmp_jmp;
+#endif
   png_error_ptr error_fn;
   png_error_ptr warning_fn;
   png_voidp error_ptr;
@@ -963,16 +1013,19 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   png_free(png_ptr, png_ptr->gamma_from_1);
   png_free(png_ptr, png_ptr->gamma_to_1);
 #endif
-   if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
+   if (png_ptr->free_me & PNG_FREE_PLTE)
      png_zfree(png_ptr, png_ptr->palette);
+   png_ptr->free_me &= ~PNG_FREE_PLTE;
 #if defined(PNG_tRNS_SUPPORTED) || \
    defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
+   if (png_ptr->free_me & PNG_FREE_TRNS)
      png_free(png_ptr, png_ptr->trans);
+   png_ptr->free_me &= ~PNG_FREE_TRNS;
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-   if (png_ptr->flags & PNG_FLAG_FREE_HIST)
+   if (png_ptr->free_me & PNG_FREE_HIST)
      png_free(png_ptr, png_ptr->hist);
+   png_ptr->free_me &= ~PNG_FREE_HIST;
 #endif
 #if defined(PNG_READ_GAMMA_SUPPORTED)
   if (png_ptr->gamma_16_table != NULL)
@@ -1020,7 +1073,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   /* Save the important info out of the png_struct, in case it is
    * being used again.
    */
+#ifdef PNG_SETJMP_SUPPORTED
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif

   error_fn = png_ptr->error_fn;
   warning_fn = png_ptr->warning_fn;
@@ -1038,7 +1093,10 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   png_ptr->free_fn = free_fn;
 #endif

+#ifdef PNG_SETJMP_SUPPORTED
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
+
 }

 void
@@ -1046,3 +1104,138 @@ png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 {
   png_ptr->read_row_fn = read_row_fn;
 }
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void png_read_png(png_structp png_ptr, png_infop info_ptr,
+                           int transforms,
+                           voidp params)
+{
+   int row;
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
+   /* invert the alpha channel from opacity to transparency */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+   /* The call to png_read_info() gives us all of the information from the
+    * PNG file before the first IDAT (image data chunk).
+    */
+   png_read_info(png_ptr, info_ptr);
+
+   /* -------------- image transformations start here ------------------- */
+
+#if defined(PNG_READ_16_TO_8_SUPPORTED)
+   /* tell libpng to strip 16 bit/color files down to 8 bits/color */
+   if (transforms & PNG_TRANSFORM_STRIP_16)
+       png_set_strip_16(png_ptr);
+#endif
+
+#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+   /* Strip alpha bytes from the input data without combining with the
+    * background (not recommended).
+    */
+   if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
+       png_set_strip_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
+   /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
+    * byte into separate bytes (useful for paletted and grayscale images).
+    */
+   if (transforms & PNG_TRANSFORM_PACKING)
+       png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+   /* Change the order of packed pixels to least significant bit first
+    * (not useful if you are using png_set_packing). */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+       png_set_packswap(png_ptr);
+#endif
+
+#if defined(PNG_READ_EXPAND_SUPPORTED)
+   /* Expand paletted colors into true RGB triplets
+    * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
+    * Expand paletted or RGB images with transparency to full alpha
+    * channels so the data will be available as RGBA quartets.
+    */
+   if (transforms & PNG_TRANSFORM_EXPAND)
+       if ((png_ptr->bit_depth < 8) ||
+           (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+           (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+         png_set_expand(png_ptr);
+#endif
+
+   /* We don't handle background color or gamma transformation or dithering. */
+
+#if defined(PNG_READ_INVERT_SUPPORTED)
+   /* invert monochrome files to have 0 as white and 1 as black */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+       png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED)
+   /* If you want to shift the pixel values from the range [0,255] or
+    * [0,65535] to the original [0,7] or [0,31], or whatever range the
+    * colors were originally in:
+    */
+   if ((transforms & PNG_TRANSFORM_SHIFT)
+       && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
+   {
+      png_color_8p sig_bit;
+
+      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
+      png_set_shift(png_ptr, sig_bit);
+   }
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED)
+   /* flip the RGB pixels to BGR (or RGBA to BGRA) */
+   if (transforms & PNG_TRANSFORM_BGR)
+       png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
+   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+       png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED)
+   /* swap bytes of 16 bit files to least significant byte first */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+       png_set_swap(png_ptr);
+#endif
+
+   /* We don't handle adding filler bytes */
+
+   /* Optional call to gamma correct and add the background to the palette
+    * and update info structure.  REQUIRED if you are expecting libpng to
+    * update the palette for you (ie you selected such a transform above).
+    */
+   png_read_update_info(png_ptr, info_ptr);
+
+   /* -------------- image transformations end here ------------------- */
+
+   if(info_ptr->row_pointers == NULL)
+   {
+      info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
+                                         info_ptr->height * sizeof(png_bytep));
+      info_ptr->free_me |= PNG_FREE_ROWS;
+   }
+   for (row = 0; row < (int)info_ptr->height; row++)
+       info_ptr->row_pointers[row] = png_malloc(png_ptr,
+                                      png_get_rowbytes(png_ptr, info_ptr));
+
+   png_read_image(png_ptr, info_ptr->row_pointers);
+   info_ptr->valid |= PNG_INFO_IDAT;
+
+   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   png_read_end(png_ptr, info_ptr);
+
+   if(transforms == 0 || params == (voidp)NULL)
+      /* quiet compiler warnings */ return;
+
+}
+#endif
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,11 +1,11 @@

 /* pngrio.c - functions for data input
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file provides a location for all input.  Users who need
 * special handling are expected to write a function that has the same
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,11 +1,11 @@

 /* pngrtran.c - transforms the data in a row for PNG readers
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file contains functions optionally called by an application
 * in order to tell libpng how to handle data when reading a PNG.
@@ -367,7 +367,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
                     {
                        int j, next_j;

-                        if (num_new_palette & 1)
+                        if (num_new_palette & 0x01)
                        {
                           j = p->left;
                           next_j = p->right;
@@ -582,14 +582,25 @@ png_set_gray_to_rgb(png_structp png_ptr)
 }
 #endif

-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) && \
-    defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#if defined(PNG_FLOATING_POINT_SUPPORTED)
 /* Convert a RGB image to a grayscale of the same width.  This allows us,
 * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
 */
+
 void
 png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
-  double green)
+   double green)
+{
+      int red_fixed = (int)((float)red*100000.0 + 0.5);
+      int green_fixed = (int)((float)green*100000.0 + 0.5);
+      png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
+}
+#endif
+
+void
+png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
+   png_fixed_point red, png_fixed_point green)
 {
   png_debug(1, "in png_set_rgb_to_gray\n");
   switch(error_action)
@@ -610,22 +621,26 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
   }
 #endif
   {
-      png_byte red_byte = (png_byte)((float)red*255.0 + 0.5);
-      png_byte green_byte = (png_byte)((float)green*255.0 + 0.5);
-      if(red < 0.0 || green < 0.0)
+      png_uint_16 red_int, green_int;
+      if(red < 0 || green < 0)
      {
-         red_byte = 54;
-         green_byte = 183;
+         red_int   =  6968; /* .212671 * 32768 + .5 */
+         green_int = 23434; /* .715160 * 32768 + .5 */
      }
-      else if(red_byte + green_byte > 255)
+      else if(red + green < 100000L)
+      {
+        red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
+        green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
+      }
+      else
      {
         png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
-         red_byte = 54;
-         green_byte = 183;
+         red_int   =  6968;
+         green_int = 23434;
      }
-      png_ptr->rgb_to_gray_red_coeff   = red_byte;
-      png_ptr->rgb_to_gray_green_coeff = green_byte;
-      png_ptr->rgb_to_gray_blue_coeff  = (png_byte)(255-red_byte-green_byte);
+      png_ptr->rgb_to_gray_red_coeff   = red_int;
+      png_ptr->rgb_to_gray_green_coeff = green_int;
+      png_ptr->rgb_to_gray_blue_coeff  = (png_uint_16)(32768-red_int-green_int);
   }
 }
 #endif
@@ -658,7 +673,8 @@ png_init_read_transformations(png_structp png_ptr)
 #endif

 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
-   if (png_ptr->transformations & PNG_BACKGROUND_EXPAND)
+   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+       (png_ptr->transformations & PNG_EXPAND))
   {
      if (!(color_type & PNG_COLOR_MASK_COLOR))  /* i.e., GRAY or GRAY_ALPHA */
      {
@@ -897,8 +913,8 @@ png_init_read_transformations(png_structp png_ptr)
 #endif
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
   /* No GAMMA transformation */
-   if (png_ptr->transformations & PNG_BACKGROUND &&
-       color_type == PNG_COLOR_TYPE_PALETTE)
+   if ((png_ptr->transformations & PNG_BACKGROUND) &&
+       (color_type == PNG_COLOR_TYPE_PALETTE))
   {
      int i;
      int istop = (int)png_ptr->num_trans;
@@ -931,7 +947,7 @@ png_init_read_transformations(png_structp png_ptr)

 #if defined(PNG_READ_SHIFT_SUPPORTED)
   if ((png_ptr->transformations & PNG_SHIFT) &&
-      color_type == PNG_COLOR_TYPE_PALETTE)
+      (color_type == PNG_COLOR_TYPE_PALETTE))
   {
      png_uint_16 i;
      png_uint_16 istop = png_ptr->num_palette;
@@ -1009,7 +1025,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 #endif

 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-   if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16)
+   if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
      info_ptr->bit_depth = 8;
 #endif

@@ -1026,7 +1042,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 #endif

 #if defined(PNG_READ_PACK_SUPPORTED)
-   if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8)
+   if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
      info_ptr->bit_depth = 8;
 #endif

@@ -1057,9 +1073,9 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)

 #if defined(PNG_READ_FILLER_SUPPORTED)
   /* STRIP_ALPHA and FILLER allowed:  MASK_ALPHA bit stripped above */
-   if (png_ptr->transformations & PNG_FILLER &&
-       (info_ptr->color_type == PNG_COLOR_TYPE_RGB ||
-        info_ptr->color_type == PNG_COLOR_TYPE_GRAY))
+   if ((png_ptr->transformations & PNG_FILLER) &&
+       ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
+       (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
      info_ptr->channels++;
 #endif

@@ -1177,7 +1193,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
   /* if gray -> RGB, do so now only if background is non-gray; else do later
    * for performance reasons */
-   if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
       !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
      png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
@@ -1251,8 +1267,8 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:

 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
   /* if gray -> RGB, do so now only if we did not do so above */
-   if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
-       png_ptr->mode & PNG_BACKGROUND_IS_GRAY)
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+       (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
      png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif

@@ -1330,10 +1346,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
         {
            png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = 7 - (int)((row_width + 7) & 7);
+            png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
            for (i = 0; i < row_width; i++)
            {
-               *dp = (png_byte)((*sp >> shift) & 0x1);
+               *dp = (png_byte)((*sp >> shift) & 0x01);
               if (shift == 7)
               {
                  shift = 0;
@@ -1351,10 +1367,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)

            png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+            png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
            for (i = 0; i < row_width; i++)
            {
-               *dp = (png_byte)((*sp >> shift) & 0x3);
+               *dp = (png_byte)((*sp >> shift) & 0x03);
               if (shift == 6)
               {
                  shift = 0;
@@ -1371,10 +1387,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
         {
            png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+            png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
            for (i = 0; i < row_width; i++)
            {
-               *dp = (png_byte)((*sp >> shift) & 0xf);
+               *dp = (png_byte)((*sp >> shift) & 0x0f);
               if (shift == 4)
               {
                  shift = 0;
@@ -1674,9 +1690,15 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
            for (i = 0; i < row_width; i++)
            {
               *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=3;
+               dp=sp;
            }
         }
         /* This inverts the alpha channel in RRGGBBAA */
@@ -1690,12 +1712,18 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
            {
               *(--dp) = (png_byte)(255 - *(--sp));
               *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=6;
+               dp=sp;
            }
         }
      }
@@ -1725,8 +1753,12 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
            {
               *(--dp) = (png_byte)(255 - *(--sp));
               *(--dp) = (png_byte)(255 - *(--sp));
+/*
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
+*/
+               sp-=2;
+               dp=sp;
            }
         }
      }
@@ -2004,11 +2036,11 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
 *
 *  We approximate this with
 *
- *     Y = 0.211 * R    + 0.715 * G    + 0.074 * B
+ *     Y = 0.21268 * R    + 0.7151 * G    + 0.07217 * B
 *
 *  which can be expressed with integers as
 *
- *     Y = (54 * R + 183 * G + 19 * B)/256
+ *     Y = (6969 * R + 23434 * G + 2365 * B)/32768
 *
 *  The calculation is to be done in a linear colorspace.
 *
@@ -2030,9 +2062,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
 #endif
      (row_info->color_type & PNG_COLOR_MASK_COLOR))
   {
-      png_byte rc = png_ptr->rgb_to_gray_red_coeff;
-      png_byte gc = png_ptr->rgb_to_gray_green_coeff;
-      png_byte bc = png_ptr->rgb_to_gray_blue_coeff;
+      png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
+      png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
+      png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;

      if (row_info->color_type == PNG_COLOR_TYPE_RGB)
      {
@@ -2053,7 +2085,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                  {
                     rgb_error |= 1;
                     *(dp++) = png_ptr->gamma_from_1[
-                       (rc*red+gc*green+bc*blue)>>8];
+                       (rc*red+gc*green+bc*blue)>>15];
                  }
                  else
                     *(dp++) = *(sp-1);
@@ -2072,7 +2104,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                  if(red != green || red != blue)
                  {
                     rgb_error |= 1;
-                     *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>8);
+                     *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15);
                  }
                  else
                     *(dp++) = *(sp-1);
@@ -2107,7 +2139,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
                                  png_ptr->gamma_shift][blue>>8];
                     png_uint_16 gray16  = (png_uint_16)((rc*red_1 + gc*green_1
-                                  + bc*blue_1)>>8);
+                                  + bc*blue_1)>>15);
                     w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
                         png_ptr->gamma_shift][gray16 >> 8];
                     rgb_error |= 1;
@@ -2132,7 +2164,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)

                  if(red != green || red != blue)
                     rgb_error |= 1;
-                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
                  *(dp++) = (png_byte)((gray16>>8) & 0xff);
                  *(dp++) = (png_byte)(gray16 & 0xff);
               }
@@ -2156,7 +2188,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                  if(red != green || red != blue)
                     rgb_error |= 1;
                  *(dp++) =  png_ptr->gamma_from_1
-                             [(rc*red + gc*green + bc*blue)>>8];
+                             [(rc*red + gc*green + bc*blue)>>15];
                  *(dp++) = *(sp++);  /* alpha */
               }
            }
@@ -2204,7 +2236,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
                                  png_ptr->gamma_shift][blue>>8];
                     png_uint_16 gray16  = (png_uint_16)((rc * red_1
-                                  + gc * green_1 + bc * blue_1)>>8);
+                                  + gc * green_1 + bc * blue_1)>>15);
                     w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
                         png_ptr->gamma_shift][gray16 >> 8];
                     rgb_error |= 1;
@@ -2229,7 +2261,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                  blue  = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
                  if(red != green || red != blue)
                     rgb_error |= 1;
-                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
                  *(dp++) = (png_byte)((gray16>>8) & 0xff);
                  *(dp++) = (png_byte)(gray16 & 0xff);
                  *(dp++) = *(sp++);  /* alpha */
@@ -2518,7 +2550,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                  shift = 7;
                  for (i = 0; i < row_width; i++)
                  {
-                     if ((png_uint_16)((*sp >> shift) & 0x1)
+                     if ((png_uint_16)((*sp >> shift) & 0x01)
                        == trans_values->gray)
                     {
                        *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
@@ -2543,7 +2575,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                     shift = 6;
                     for (i = 0; i < row_width; i++)
                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x3)
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
                            == trans_values->gray)
                        {
                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@@ -2551,9 +2583,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                        }
                        else
                        {
-                           png_byte p = (png_byte)((*sp >> shift) & 0x3);
+                           png_byte p = (png_byte)((*sp >> shift) & 0x03);
                           png_byte g = (png_byte)((gamma_table [p | (p << 2) |
-                               (p << 4) | (p << 6)] >> 6) & 0x3);
+                               (p << 4) | (p << 6)] >> 6) & 0x03);
                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
                           *sp |= (png_byte)(g << shift);
                        }
@@ -2573,7 +2605,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                     shift = 6;
                     for (i = 0; i < row_width; i++)
                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x3)
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
                            == trans_values->gray)
                        {
                           *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@@ -2599,7 +2631,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                     shift = 4;
                     for (i = 0; i < row_width; i++)
                     {
-                        if ((png_uint_16)((*sp >> shift) & 0xf)
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
                            == trans_values->gray)
                        {
                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@@ -2607,9 +2639,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                        }
                        else
                        {
-                           png_byte p = (png_byte)((*sp >> shift) & 0xf);
+                           png_byte p = (png_byte)((*sp >> shift) & 0x0f);
                           png_byte g = (png_byte)((gamma_table[p |
-                             (p << 4)] >> 4) & 0xf);
+                             (p << 4)] >> 4) & 0x0f);
                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
                           *sp |= (png_byte)(g << shift);
                        }
@@ -2629,7 +2661,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                     shift = 4;
                     for (i = 0; i < row_width; i++)
                     {
-                        if ((png_uint_16)((*sp >> shift) & 0xf)
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
                            == trans_values->gray)
                        {
                           *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@@ -3362,10 +3394,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
            {
               sp = row + (png_size_t)((row_width - 1) >> 3);
               dp = row + (png_size_t)row_width - 1;
-               shift = 7 - (int)((row_width + 7) & 7);
+               shift = 7 - (int)((row_width + 7) & 0x07);
               for (i = 0; i < row_width; i++)
               {
-                  if ((*sp >> shift) & 0x1)
+                  if ((*sp >> shift) & 0x01)
                     *dp = 1;
                  else
                     *dp = 0;
@@ -3385,10 +3417,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
            {
               sp = row + (png_size_t)((row_width - 1) >> 2);
               dp = row + (png_size_t)row_width - 1;
-               shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+               shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
               for (i = 0; i < row_width; i++)
               {
-                  value = (*sp >> shift) & 0x3;
+                  value = (*sp >> shift) & 0x03;
                  *dp = (png_byte)value;
                  if (shift == 6)
                  {
@@ -3406,10 +3438,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
            {
               sp = row + (png_size_t)((row_width - 1) >> 1);
               dp = row + (png_size_t)row_width - 1;
-               shift = (int)((row_width & 1) << 2);
+               shift = (int)((row_width & 0x01) << 2);
               for (i = 0; i < row_width; i++)
               {
-                  value = (*sp >> shift) & 0xf;
+                  value = (*sp >> shift) & 0x0f;
                  *dp = (png_byte)value;
                  if (shift == 4)
                  {
@@ -3508,10 +3540,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                  gray = (png_uint_16)(gray*0xff);
                  sp = row + (png_size_t)((row_width - 1) >> 3);
                  dp = row + (png_size_t)row_width - 1;
-                  shift = 7 - (int)((row_width + 7) & 7);
+                  shift = 7 - (int)((row_width + 7) & 0x07);
                  for (i = 0; i < row_width; i++)
                  {
-                     if ((*sp >> shift) & 0x1)
+                     if ((*sp >> shift) & 0x01)
                        *dp = 0xff;
                     else
                        *dp = 0;
@@ -3532,10 +3564,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                  gray = (png_uint_16)(gray*0x55);
                  sp = row + (png_size_t)((row_width - 1) >> 2);
                  dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+                  shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
                  for (i = 0; i < row_width; i++)
                  {
-                     value = (*sp >> shift) & 0x3;
+                     value = (*sp >> shift) & 0x03;
                     *dp = (png_byte)(value | (value << 2) | (value << 4) |
                        (value << 6));
                     if (shift == 6)
@@ -3555,10 +3587,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                  gray = (png_uint_16)(gray*0x11);
                  sp = row + (png_size_t)((row_width - 1) >> 1);
                  dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+                  shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
                  for (i = 0; i < row_width; i++)
                  {
-                     value = (*sp >> shift) & 0xf;
+                     value = (*sp >> shift) & 0x0f;
                     *dp = (png_byte)(value | (value << 4));
                     if (shift == 4)
                     {
@@ -3809,7 +3841,7 @@ png_build_gamma_table(png_structp png_ptr)

 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
    defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
+      if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
      {

         g = 1.0 / (png_ptr->gamma);
--- a/pngrutil.c
+++ b/pngrutil.c
--- a/pngset.c
+++ b/pngset.c
@@ -1,11 +1,11 @@

 /* pngset.c - storage of image information into info struct
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * The functions here are used during reads to store data from the file
 * into the info struct, and during writes to store application data
@@ -48,15 +48,25 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
   info_ptr->y_green = (float)green_y;
   info_ptr->x_blue  = (float)blue_x;
   info_ptr->y_blue  = (float)blue_y;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
+   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
+   info_ptr->int_x_red   = (png_fixed_point)(red_x*100000.+0.5);
+   info_ptr->int_y_red   = (png_fixed_point)(red_y*100000.+0.5);
+   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
+   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
+   info_ptr->int_x_blue  = (png_fixed_point)(blue_x*100000.+0.5);
+   info_ptr->int_y_blue  = (png_fixed_point)(blue_y*100000.+0.5);
+#endif
   info_ptr->valid |= PNG_INFO_cHRM;
 }
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
 void
 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 white_x, png_uint_32 white_y, png_uint_32 red_x,
-   png_uint_32 red_y, png_uint_32 green_x, png_uint_32 green_y,
-   png_uint_32 blue_x, png_uint_32 blue_y)
+   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+   png_fixed_point blue_x, png_fixed_point blue_y)
 {
   png_debug1(1, "in %s storage function\n", "cHRM");
   if (png_ptr == NULL || info_ptr == NULL)
@@ -70,6 +80,16 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
   info_ptr->int_y_green = green_y;
   info_ptr->int_x_blue  = blue_x;
   info_ptr->int_y_blue  = blue_y;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   info_ptr->x_white = (float)(white_x/100000.);
+   info_ptr->y_white = (float)(white_y/100000.);
+   info_ptr->x_red   = (float)(red_x/100000.);
+   info_ptr->y_red   = (float)(red_y/100000.);
+   info_ptr->x_green = (float)(green_x/100000.);
+   info_ptr->y_green = (float)(green_y/100000.);
+   info_ptr->x_blue  = (float)(blue_x/100000.);
+   info_ptr->y_blue  = (float)(blue_y/100000.);
+#endif
   info_ptr->valid |= PNG_INFO_cHRM;
 }
 #endif
@@ -92,21 +112,20 @@ png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 }
 #endif
 #endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
 void
-png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_uint_32 int_gamma)
+png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
+   int_gamma)
 {
   png_debug1(1, "in %s storage function\n", "gAMA");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

 #ifdef PNG_FLOATING_POINT_SUPPORTED
-   info_ptr->gamma = (float)int_gamma/100000.;
+   info_ptr->gamma = (float)(int_gamma/100000.);
 #endif
   info_ptr->int_gamma = int_gamma;
   info_ptr->valid |= PNG_INFO_gAMA;
 }
-#endif

 #if defined(PNG_hIST_SUPPORTED)
 void
@@ -226,27 +245,23 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 void
 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
-             png_charp unit, double width, double height)
+             int unit, double width, double height)
 {
-   png_uint_32 length;
-
   png_debug1(1, "in %s storage function\n", "sCAL");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   length = png_strlen(unit) + 1;
-   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
-   info_ptr->scal_unit = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->scal_unit, unit, (png_size_t)length);
+   info_ptr->scal_unit = (png_byte)unit;
   info_ptr->scal_pixel_width = width;
   info_ptr->scal_pixel_height = height;

   info_ptr->valid |= PNG_INFO_sCAL;
 }
-#endif
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
 void
 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
-             png_charp unit, png_charp swidth, png_charp sheight)
+             int unit, png_charp swidth, png_charp sheight)
 {
   png_uint_32 length;

@@ -254,10 +269,7 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   length = png_strlen(unit) + 1;
-   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
-   info_ptr->scal_unit = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->scal_unit, unit, (png_size_t)length);
+   info_ptr->scal_unit = (png_byte)unit;

   length = png_strlen(swidth) + 1;
   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
@@ -272,6 +284,8 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
   info_ptr->valid |= PNG_INFO_sCAL;
 }
 #endif
+#endif
+#endif

 #if defined(PNG_pHYs_SUPPORTED)
 void
@@ -293,11 +307,13 @@ void
 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
   png_colorp palette, int num_palette)
 {
+
   png_debug1(1, "in %s storage function\n", "PLTE");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->palette = palette;
+
   info_ptr->num_palette = (png_uint_16)num_palette;
   info_ptr->valid |= PNG_INFO_PLTE;
 }
@@ -337,7 +353,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
   float file_gamma;
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   png_uint_32 int_file_gamma;
+   png_fixed_point int_file_gamma;
 #endif
 #endif
 #if defined(PNG_cHRM_SUPPORTED)
@@ -345,7 +361,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   png_uint_32 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
      int_green_y, int_blue_x, int_blue_y;
 #endif
 #endif
@@ -403,20 +419,29 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 void
 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
             png_charp name, int compression_type,
-             png_charp profile, int proflen)
+             png_charp profile, png_uint_32 proflen)
 {
+   png_charp new_iccp_name;
+   png_charp new_iccp_profile;
+
   png_debug1(1, "in %s storage function\n", "iCCP");
   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
      return;

-   info_ptr->iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
-   strcpy(info_ptr->iccp_name, name);
-   info_ptr->iccp_profile = png_malloc(png_ptr, proflen);
-   memcpy(info_ptr->iccp_profile, profile, proflen);
-   info_ptr->iccp_proflen = (png_uint_32)proflen;
+   new_iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
+   strcpy(new_iccp_name, name);
+   new_iccp_profile = png_malloc(png_ptr, proflen);
+   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
+
+   info_ptr->iccp_proflen = proflen;
+   info_ptr->iccp_name = new_iccp_name;
+   info_ptr->iccp_profile = new_iccp_profile;
   /* Compression is always zero but is here so the API and info structure
-    * does not have to change * if we introduce multiple compression types */
+    * does not have to change if we introduce multiple compression types */
   info_ptr->iccp_compression = (png_byte)compression_type;
+   info_ptr->free_me |= PNG_FREE_ICCP;
   info_ptr->valid |= PNG_INFO_iCCP;
 }
 #endif
@@ -466,56 +491,90 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

   for (i = 0; i < num_text; i++)
   {
+      png_size_t text_length,key_len,lang_len,lang_key_len;
      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
-      png_charp key,text;

      if (text_ptr[i].key == (png_charp)NULL)
          continue;

-#ifdef PNG_iTXt_SUPPORTED
-      textp->lang = text_ptr[i].lang;
-      textp->translated_key = text_ptr[i].translated_key;
-#else
-      textp->lang = NULL;
-      textp->translated_key = NULL;
-#endif
+      key_len = png_strlen(text_ptr[i].key);

-      if (text_ptr[i].text[0] == '\0')
+      if(text_ptr[i].compression > 0)
      {
-         textp->text_length = 0;
-         textp->compression = PNG_TEXT_COMPRESSION_NONE;
+        /* set iTXt data */
+        if (text_ptr[i].key != (png_charp)NULL)
+          lang_len = png_strlen(text_ptr[i].lang);
+        else
+          lang_len = 0;
+        if (text_ptr[i].lang_key != (png_charp)NULL)
+          lang_key_len = png_strlen(text_ptr[i].lang_key);
+        else
+          lang_key_len = 0;
      }
      else
      {
-         textp->text_length = png_strlen(text_ptr[i].text);
+        lang_len = 0;
+        lang_key_len = 0;
+      }
+
+      if (text_ptr[i].text == (png_charp)NULL || text_ptr[i].text[0] == '\0')
+      {
+         text_length = 0;
+         if(text_ptr[i].compression > 0)
+            textp->compression = PNG_ITXT_COMPRESSION_NONE;
+         else
+            textp->compression = PNG_TEXT_COMPRESSION_NONE;
+      }
+      else
+      {
+         text_length = png_strlen(text_ptr[i].text);
         textp->compression = text_ptr[i].compression;
      }
-      key=text_ptr[i].key;
-      for (text = key; *text++;)
-        /* empty loop to find the byte after the zero byte after the
-           end of key */ ;

      textp->key = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(text+textp->text_length - key)+1);
-      /* Caution: the calling program, not libpng, is responsible for
-         freeing this, if libpng wasn't the caller. */
+         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4));
      png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
-         text+textp->text_length-key+1, textp->key);
+         key_len + lang_len + lang_key_len + text_length + 4, textp->key);

      png_memcpy(textp->key, text_ptr[i].key,
-         (png_size_t)(text - key));  /* includes the zero-byte separator */
-
-      textp->text = textp->key + (text-key);
-      if(textp->text_length)
+         (png_size_t)(key_len));
+      *(textp->key+key_len) = '\0';
+      if (text_ptr[i].compression > 0)
      {
-         png_memcpy(textp->text, text_ptr[i].text,
-            (png_size_t)(textp->text_length));
-         *(textp->text+textp->text_length) = '\0';
+         textp->lang=textp->key + key_len + 1;
+         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+         *(textp->lang+lang_len) = '\0';
+         textp->lang_key=textp->lang + lang_len + 1;
+         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+         *(textp->lang_key+lang_key_len) = '\0';
+         textp->text=textp->lang_key + lang_key_len + 1;
      }
      else
-         textp->text--;
+      {
+         textp->lang=(png_charp)NULL;
+         textp->lang_key=(png_charp)NULL;
+         textp->text=textp->key + key_len + 1;
+      }
+
+      if(text_length)
+         png_memcpy(textp->text, text_ptr[i].text,
+            (png_size_t)(text_length));
+      *(textp->text+text_length) = '\0';
+
+      if(textp->compression > 0)
+      {
+         textp->text_length = 0;
+         textp->itxt_length = text_length;
+      }
+      else
+      {
+         textp->text_length = text_length;
+         textp->itxt_length = 0;
+      }
+
      info_ptr->text[info_ptr->num_text]= *textp;
      info_ptr->num_text++;
+      info_ptr->free_me |= PNG_FREE_TEXT;
      png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
   }
 }
@@ -545,9 +604,7 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
      return;

   if (trans != NULL)
-   {
      info_ptr->trans = trans;
-   }

   if (trans_values != NULL)
   {
@@ -563,73 +620,91 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,

 #if defined(PNG_sPLT_SUPPORTED)
 void
-png_set_spalettes(png_structp png_ptr,
-             png_infop info_ptr, png_spalette_p entries, int nentries)
+png_set_sPLT(png_structp png_ptr,
+             png_infop info_ptr, png_sPLT_tp entries, int nentries)
 {
-    png_spalette_p        np;
+    png_sPLT_tp np;
    int i;

-    np = (png_spalette_p)png_malloc(png_ptr,
-        (info_ptr->splt_palettes_num + nentries) * sizeof(png_spalette));
+    np = (png_sPLT_tp)png_malloc(png_ptr,
+        (info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));

-    memcpy(np, info_ptr->splt_palettes,
-           info_ptr->splt_palettes_num * sizeof(png_spalette));
+    png_memcpy(np, info_ptr->splt_palettes,
+           info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
    png_free(png_ptr, info_ptr->splt_palettes);

    for (i = 0; i < nentries; i++)
    {
-        png_spalette_p to = np + info_ptr->splt_palettes_num + i;
-        png_spalette_p from = entries + i;
+        png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
+        png_sPLT_tp from = entries + i;

        to->name = (png_charp)png_malloc(png_ptr,
                                        png_strlen(from->name) + 1);
        png_strcpy(to->name, from->name);
-        to->entries = (png_spalette_entryp)png_malloc(png_ptr,
-                                 from->nentries * sizeof(png_spalette));
-        memcpy(to->entries, from->entries,
-               from->nentries * sizeof(png_spalette));
+        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
+                                 from->nentries * sizeof(png_sPLT_t));
+        png_memcpy(to->entries, from->entries,
+               from->nentries * sizeof(png_sPLT_t));
+        to->nentries = from->nentries;
+        to->depth = from->depth;
    }

    info_ptr->splt_palettes = np;
    info_ptr->splt_palettes_num += nentries;
+    info_ptr->valid |= PNG_INFO_sPLT;
+    info_ptr->free_me |= PNG_FREE_SPLT;
 }
 #endif /* PNG_sPLT_SUPPORTED */

 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
 void
 png_set_unknown_chunks(png_structp png_ptr,
-   png_infop info_ptr, png_unknown_chunkp unknowns, int nunknowns)
+   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
 {
    png_unknown_chunkp np;
    int i;

-    np = (png_unknown_chunkp)png_malloc(png_ptr,
-        (info_ptr->unknown_chunks_num + nunknowns) * sizeof(png_unknown_chunk));
+    if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+        return;

-    memcpy(np, info_ptr->unknown_chunks,
+    np = (png_unknown_chunkp)png_malloc(png_ptr,
+        (info_ptr->unknown_chunks_num + num_unknowns) *
+        sizeof(png_unknown_chunk));
+
+    png_memcpy(np, info_ptr->unknown_chunks,
           info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
    png_free(png_ptr, info_ptr->unknown_chunks);

-    for (i = 0; i < nunknowns; i++)
+    for (i = 0; i < num_unknowns; i++)
    {
        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
        png_unknown_chunkp from = unknowns + i;

-        png_strcpy(to->name, from->name);
+        png_strcpy((png_charp)to->name, (png_charp)from->name);
        to->data = (png_bytep)png_malloc(png_ptr, from->size);
-        memcpy(to->data, from->data, from->size);
+        png_memcpy(to->data, from->data, from->size);
        to->size = from->size;

        /* note our location in the read or write sequence */
-        to->location = png_ptr->mode;
+        to->location = (png_byte)(png_ptr->mode & 0xff);
    }

    info_ptr->unknown_chunks = np;
-    info_ptr->unknown_chunks_num += nunknowns;
+    info_ptr->unknown_chunks_num += num_unknowns;
+    info_ptr->free_me |= PNG_FREE_UNKN;
+}
+void
+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 < 
+         (int)info_ptr->unknown_chunks_num)
+      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
 #endif

-#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED)
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
 void
 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
 {
@@ -640,9 +715,79 @@ png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
 }
 #endif

+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+void
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
+   chunk_list, int num_chunks)
+{
+    png_bytep new_list, p;
+    int i, old_num_chunks;
+    if (num_chunks == 0)
+    {
+      if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
+        png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+      else
+        png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+      if(keep == HANDLE_CHUNK_ALWAYS)
+        png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      else
+        png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      return;
+    }
+    if (chunk_list == NULL)
+      return;
+    old_num_chunks=png_ptr->num_chunk_list;
+    new_list=png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
+    if(png_ptr->chunk_list != (png_bytep)NULL)
+    {
+       png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
+       png_free(png_ptr, png_ptr->chunk_list);
+    }
+    png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
+    for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
+       *p=(png_byte)keep;
+    png_ptr->num_chunk_list=old_num_chunks+num_chunks;
+    png_ptr->chunk_list=new_list;
+    png_ptr->free_me |= PNG_FREE_LIST;
+}
+#endif
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+void
+png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+   png_user_chunk_ptr read_user_chunk_fn)
+{
+   png_debug(1, "in png_set_read_user_chunk_fn\n");
+   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
+   png_ptr->user_chunk_ptr = user_chunk_ptr;
+}
+#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void
+png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+{
+   png_debug1(1, "in %s storage function\n", "rows");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if(info_ptr->row_pointers != row_pointers)
+   {
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+      info_ptr->row_pointers = row_pointers;
+   }
+}
+#endif


-
-
-
-
+void
+png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
+{
+    if(png_ptr->zbuf)
+       png_free(png_ptr, png_ptr->zbuf);
+    png_ptr->zbuf_size = (png_size_t)size;
+    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+    png_ptr->zstream.next_out = png_ptr->zbuf;
+    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+}
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,11 +1,11 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This program reads in a PNG image, writes it out again, and then
 * compares the two files.  If the files are identical, this shows that
@@ -15,11 +15,11 @@
 *
 * The program will report "FAIL" in certain legitimate cases:
 * 1) when the compression level or filter selection method is changed.
- * 2) when the chunk size is not 8K.
+ * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
 * 3) unknown ancillary chunks exist in the input file.
 * 4) others not listed here...
 * In these cases, it is best to check with another tool such as "pngcheck"
- * to see what the differences between the two images are.
+ * to see what the differences between the two files are.
 *
 * If a filename is given on the command-line, then this file is used
 * for the input, rather than the default "pngtest.png".  This allows
@@ -29,6 +29,7 @@

 #include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>

 /* Makes pngtest verbose so we can find problems (needs to be before png.h) */
 #ifndef PNG_DEBUG
@@ -50,6 +51,11 @@ static float t_start, t_stop, t_decode, t_encode, t_misc;

 #include "png.h"

+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
+#endif
+
 #ifdef PNGTEST_TIMING
 static float t_start, t_stop, t_decode, t_encode, t_misc;
 #if !defined(PNG_tIME_SUPPORTED)
@@ -151,7 +157,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
       {
          if(row_info->bit_depth == 1)
          {
-             if(((*dp << pos++ )& 0x80) == 0) zero_samples++;
+             if(((*dp << pos++ ) & 0x80) == 0) zero_samples++;
             if(pos == 8)
             {
                pos = 0;
@@ -160,7 +166,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
          }
          if(row_info->bit_depth == 2)
          {
-             if(((*dp << (pos+=2))& 0xc0) == 0) zero_samples++;
+             if(((*dp << (pos+=2)) & 0xc0) == 0) zero_samples++;
             if(pos == 8)
             {
                pos = 0;
@@ -169,7 +175,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
          }
          if(row_info->bit_depth == 4)
          {
-             if(((*dp << (pos+=4))& 0xf0) == 0) zero_samples++;
+             if(((*dp << (pos+=4)) & 0xf0) == 0) zero_samples++;
             if(pos == 8)
             {
                pos = 0;
@@ -409,7 +415,8 @@ png_default_error(png_structp png_ptr, png_const_charp message)

   This piece of code can be compiled to validate max 64K allocations
   by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
-typedef struct memory_information {
+typedef struct memory_information
+{
   png_uint_32                    size;
   png_voidp                 pointer;
   struct memory_information FAR *next;
@@ -426,7 +433,8 @@ extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
   png_voidp ptr));

 png_voidp
-png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
+png_debug_malloc(png_structp png_ptr, png_uint_32 size)
+{

   /* png_malloc has already tested for NULL; png_create_struct calls
      png_debug_malloc directly, with png_ptr == NULL which is OK */
@@ -451,6 +459,7 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
      if(verbose)
         printf("png_malloc %d bytes at %x\n",size,pinfo->pointer);
 #endif
+      assert(pinfo->size != 12345);
      return (png_voidp)(pinfo->pointer);
   }
 }
@@ -461,7 +470,8 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
 {
   if (png_ptr == NULL)
      fprintf(STDERR, "NULL pointer to png_debug_free.\n");
-   if (ptr == 0) {
+   if (ptr == 0)
+   {
 #if 0 /* This happens all the time. */
      fprintf(STDERR, "WARNING: freeing NULL pointer\n");
 #endif
@@ -471,9 +481,11 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
   /* Unlink the element from the list. */
   {
      memory_infop FAR *ppinfo = &pinformation;
-      for (;;) {
+      for (;;)
+      {
         memory_infop pinfo = *ppinfo;
-         if (pinfo->pointer == ptr) {
+         if (pinfo->pointer == ptr)
+         {
            *ppinfo = pinfo->next;
            current_allocation -= pinfo->size;
            if (current_allocation < 0)
@@ -484,7 +496,8 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
            png_free_default(png_ptr, pinfo);
            break;
         }
-         if (pinfo->next == NULL) {
+         if (pinfo->next == NULL)
+         {
            fprintf(STDERR, "Pointer %x not found\n", ptr);
            break;
         }
@@ -514,8 +527,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   png_uint_32 width, height;
   int num_pass, pass;
   int bit_depth, color_type;
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
   jmp_buf jmpbuf;
+#endif
 #endif

   char inbuf[256], outbuf[256];
@@ -568,11 +583,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_USER_MEM_SUPPORTED
 #endif

+#ifdef PNG_SETJMP_SUPPORTED
   png_debug(0, "Setting jmpbuf for read struct\n");
 #ifdef USE_FAR_KEYWORD
   if (setjmp(jmpbuf))
 #else
-   if (setjmp(read_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(read_ptr)))
 #endif
   {
      fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
@@ -584,14 +600,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      return (1);
   }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(read_ptr),jmpbuf,sizeof(jmp_buf));
 #endif

   png_debug(0, "Setting jmpbuf for write struct\n");
 #ifdef USE_FAR_KEYWORD
   if (setjmp(jmpbuf))
 #else
-   if (setjmp(write_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(write_ptr)))
 #endif
   {
      fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
@@ -603,7 +619,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      return (1);
   }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(write_ptr),jmpbuf,sizeof(jmp_buf));
+#endif
 #endif

   png_debug(0, "Initializing input and output streams\n");
@@ -643,6 +660,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   png_set_write_user_transform_fn(write_ptr, count_zero_samples);
 #endif

+#define HANDLE_CHUNK_IF_SAFE      2
+#define HANDLE_CHUNK_ALWAYS       3
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+   png_set_keep_unknown_chunks(read_ptr, HANDLE_CHUNK_ALWAYS, NULL, 0);
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   png_set_keep_unknown_chunks(write_ptr, HANDLE_CHUNK_IF_SAFE, NULL, 0);
+#endif
+
   png_debug(0, "Reading info struct\n");
   png_read_info(read_ptr, read_info_ptr);

@@ -663,7 +689,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   }
 #if defined(PNG_cHRM_SUPPORTED)
   {
-      png_uint_32 white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
+      png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
         blue_y;

      if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
@@ -676,7 +702,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 #if defined(PNG_gAMA_SUPPORTED)
   {
-      png_uint_32 gamma;
+      png_fixed_point gamma;

      if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
      {
@@ -688,7 +714,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   {
      png_charp name;
      png_charp profile;
-      png_int_32 proflen;
+      png_uint_32 proflen;
      int compression_type;

      if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
@@ -740,7 +766,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 #if defined(PNG_oFFs_SUPPORTED)
   {
-      long offset_x, offset_y;
+      png_int_32 offset_x, offset_y;
      int unit_type;

      if (png_get_oFFs(read_ptr, read_info_ptr,&offset_x,&offset_y,&unit_type))
@@ -788,7 +814,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #if defined(PNG_sCAL_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
   {
-      png_charp unit;
+      int unit;
      double width, height;

      if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &width, &height))
@@ -797,9 +823,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      }
   }
 #else
-#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
   {
-      png_charp unit, width, height;
+      int unit;
+      png_charp width, height;

      if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &width, &height))
      {
@@ -807,6 +834,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      }
   }
 #endif
+#endif
+#endif
 #if defined(PNG_TEXT_SUPPORTED)
   {
      png_textp text_ptr;
@@ -850,6 +879,25 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      }
   }
 #endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   {
+      png_unknown_chunkp unknowns;
+      int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
+         &unknowns);
+      if (num_unknowns)
+      {
+         png_size_t i;
+         png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
+           num_unknowns);
+         /* copy the locations from the read_info_ptr.  The automatically
+            generated locations in write_info_ptr are wrong because we
+            haven't written anything yet */
+         for (i = 0; i < (png_size_t)num_unknowns; i++)
+           png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
+             unknowns[i].location);
+      }
+   }
+#endif

   png_debug(0, "\nWriting info struct\n");

@@ -906,7 +954,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      }
   }

+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+   png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
+#endif
+
   png_debug(0, "Reading and writing end_info data\n");
+
   png_read_end(read_ptr, end_info_ptr);
 #if defined(PNG_TEXT_SUPPORTED)
   {
@@ -936,6 +992,26 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
      }
   }
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   {
+      png_unknown_chunkp unknowns;
+      int num_unknowns;
+      num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
+         &unknowns);
+      if (num_unknowns)
+      {
+         png_size_t i;
+         png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
+           num_unknowns);
+         /* copy the locations from the read_info_ptr.  The automatically
+            generated locations in write_end_info_ptr are wrong because we
+            haven't written the end_info yet */
+         for (i = 0; i < (png_size_t)num_unknowns; i++)
+           png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
+             unknowns[i].location);
+      }
+   }
 #endif
   png_write_end(write_ptr, write_end_info_ptr);

@@ -982,16 +1058,17 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)

      if (num_in != num_out)
      {
-         fprintf(STDERR, "Files %s and %s are of a different size\n",
+         fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                 inname, outname);
         if(wrote_question == 0)
         {
            fprintf(STDERR,
-              "   Was %s written with the same chunk size (8k),",inname);
+         "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
+              inname,PNG_ZBUF_SIZE);
            fprintf(STDERR,
-              " filtering\n   heuristic (libpng default), compression");
+              "\n   filtering heuristic (libpng default), compression");
            fprintf(STDERR,
-              " level (zlib default)\n   and zlib version (%s)?\n\n",
+              " level (zlib default),\n   and zlib version (%s)?\n\n",
              ZLIB_VERSION);
            wrote_question=1;
         }
@@ -1009,11 +1086,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
         if(wrote_question == 0)
         {
            fprintf(STDERR,
-              "   Was %s written with the same chunk size (8k),",inname);
+         "   Was %s written with the same maximum IDAT chunk size (%d bytes),",
+                 inname,PNG_ZBUF_SIZE);
            fprintf(STDERR,
-              " filtering\n   heuristic (libpng default), compression");
+              "\n   filtering heuristic (libpng default), compression");
            fprintf(STDERR,
-              " level (zlib default)\n   and zlib version (%s)?\n\n",
+              " level (zlib default),\n   and zlib version (%s)?\n\n",
              ZLIB_VERSION);
            wrote_question=1;
         }
@@ -1154,15 +1232,17 @@ main(int argc, char *argv[])
         if (allocation_now != current_allocation)
            fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation-allocation_now);
-         if (current_allocation != 0) {
+         if (current_allocation != 0)
+         {
            memory_infop pinfo = pinformation;

            fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
               current_allocation);
-            while (pinfo != NULL) {
+            while (pinfo != NULL)
+            {
               fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
               pinfo = pinfo->next;
-               }
+            }
         }
 #endif
      }
@@ -1176,7 +1256,8 @@ main(int argc, char *argv[])
   else
   {
      int i;
-      for (i=0; i<3; ++i) {
+      for (i=0; i<3; ++i)
+      {
         int kerror;
 #ifdef PNG_USER_MEM_SUPPORTED
         int allocation_now = current_allocation;
@@ -1219,13 +1300,16 @@ main(int argc, char *argv[])
         if (allocation_now != current_allocation)
             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation-allocation_now);
-         if (current_allocation != 0) {
+         if (current_allocation != 0)
+         {
             memory_infop pinfo = pinformation;

             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                current_allocation);
-             while (pinfo != NULL) {
-                fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+             while (pinfo != NULL)
+             {
+                fprintf(STDERR," %d bytes at %x\n",
+                   pinfo->size, pinfo->pointer);
                pinfo = pinfo->next;
             }
          }
@@ -1261,9 +1345,4 @@ main(int argc, char *argv[])
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-void
-png_check_pngtest_version
-   (version_1_0_5h png_h_is_not_version_1_0_5h)
-{
-   if(png_h_is_not_version_1_0_5h == NULL) return;
-}
+typedef version_1_0_6h your_png_h_is_not_version_1_0_6h;
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,11 +1,11 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 #define PNG_INTERNAL
--- a/pngtypes.h
+++ b/pngtypes.h
@@ -1,34 +0,0 @@
-/* pngtypes.h - array of chunk-types for libpng
- *
- * libpng 1.0.5h - December 10, 1999
- * 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- */
-
-/* Constant strings for known chunk types.  If you need to add a chunk,
- * define the string in png.h and invoke it here.
- */
-
-PNG_IHDR;
-PNG_IDAT;
-PNG_IEND;
-PNG_PLTE;
-PNG_bKGD;
-PNG_cHRM;
-PNG_gAMA;
-PNG_hIST;
-PNG_iCCP;
-PNG_iTXt;
-PNG_oFFs;
-PNG_pCAL;
-PNG_pHYs;
-PNG_sBIT;
-PNG_sPLT;
-PNG_sRGB;
-PNG_tEXt;
-PNG_tIME;
-PNG_tRNS;
-PNG_zTXt;
-
--- a/pngvcrd.c
+++ b/pngvcrd.c
@@ -2,10 +2,10 @@
 *
 * For Intel x86 CPU and Microsoft Visual C++ compiler
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 2000
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998, Intel Corporation
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * Contributed by Nirav Chhatrapati, Intel Corporation, 1998
 * Interface to libpng contributed by Gilles Vollant, 1999
@@ -33,6 +33,9 @@ static int mmxsupport()
 {
  int mmx_supported_local = 0;
  _asm {
+    push ebx          //CPUID will trash these
+    push ecx
+    push edx
    pushfd            //Save Eflag to stack
    pop eax           //Get Eflag from stack into eax
    mov ecx, eax      //Make another copy of Eflag in ecx
@@ -70,7 +73,9 @@ static int mmxsupport()

 NOT_SUPPORTED:
    mov  eax, mmx_supported_local  //move return value to eax
-
+    pop edx          //CPUID trashed these
+    pop ecx
+    pop ebx
  }

  //mmx_supported_local=0; // test code for force don't support MMX
@@ -3653,7 +3658,7 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 #ifdef PNG_DEBUG
   char filnm[6];
 #endif
-   #define UseMMX 1
+#define UseMMX 1

   if (mmx_supported == 2)
       mmx_supported = mmxsupport();
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,11 +1,11 @@

 /* pngwio.c - functions for data output
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 *
 * This file provides a location for all output.  Users who need
 * special handling are expected to write functions that have the same
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,11 +1,11 @@

 /* pngwrite.c - general routines to write a PNG file
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 /* get internal access to png.h */
@@ -24,9 +24,6 @@
 void
 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-   int i;
-#endif
   png_debug(1, "in png_write_info_before_PLTE\n");
   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
   {
@@ -45,11 +42,11 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_gAMA_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_gAMA)
   {
-#ifdef PNG_FIXED_POINT_SUPPORTED
-      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
-#else
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
      png_write_gAMA(png_ptr, info_ptr->gamma);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
 #  endif
 #endif
   }
@@ -63,11 +60,6 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_TEXT_COMPRESSION_NONE,
                     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-   if (info_ptr->valid & PNG_INFO_sPLT)
-     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
-       png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
-#endif
 #if defined(PNG_WRITE_sBIT_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_sBIT)
      png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
@@ -75,19 +67,19 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_cHRM_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_cHRM)
   {
-#ifdef PNG_FIXED_POINT_SUPPORTED
-      png_write_cHRM_fixed(png_ptr,
-         info_ptr->int_x_white, info_ptr->int_y_white,
-         info_ptr->int_x_red, info_ptr->int_y_red,
-         info_ptr->int_x_green, info_ptr->int_y_green,
-         info_ptr->int_x_blue, info_ptr->int_y_blue);
-#else
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
      png_write_cHRM(png_ptr,
         info_ptr->x_white, info_ptr->y_white,
         info_ptr->x_red, info_ptr->y_red,
         info_ptr->x_green, info_ptr->y_green,
         info_ptr->x_blue, info_ptr->y_blue);
+#else
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_cHRM_fixed(png_ptr,
+         info_ptr->int_x_white, info_ptr->int_y_white,
+         info_ptr->int_x_red, info_ptr->int_y_red,
+         info_ptr->int_x_green, info_ptr->int_y_green,
+         info_ptr->int_x_blue, info_ptr->int_y_blue);
 #  endif
 #endif
   }
@@ -102,8 +94,16 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
       for (up = info_ptr->unknown_chunks;
            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
            up++)
-         if (!(up->location & PNG_HAVE_PLTE))
+       {
+         int keep=png_handle_as_unknown(png_ptr, up->name);
+         if (keep != HANDLE_CHUNK_NEVER &&
+            up->location && (!(up->location & PNG_HAVE_PLTE)) &&
+            ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
   }
 #endif
      png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
@@ -113,7 +113,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 void
 png_write_info(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_WRITE_TEXT_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
   int i;
 #endif

@@ -132,7 +132,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
      {
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
         /* invert the alpha channel (in tRNS) */
-         if (png_ptr->transformations & PNG_INVERT_ALPHA &&
+         if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
            info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
         {
            int j;
@@ -165,8 +165,18 @@ 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)
-      png_write_sCAL_s(png_ptr, info_ptr->scal_unit,
+#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
 #if defined(PNG_WRITE_pHYs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_pHYs)
@@ -180,6 +190,11 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
      png_ptr->mode |= PNG_WROTE_tIME;
   }
 #endif
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_sPLT)
+     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+       png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif
 #if defined(PNG_WRITE_TEXT_SUPPORTED)
   /* Check to see if we need to write text chunks */
   for (i = 0; i < info_ptr->num_text; i++)
@@ -187,15 +202,15 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
      png_debug2(2, "Writing header text chunk %d, type %d\n", i,
         info_ptr->text[i].compression);
      /* an internationalized chunk? */
-      if (info_ptr->text[i].lang)
+      if (info_ptr->text[i].compression > 0)
      {
 #if defined(PNG_WRITE_iTXt_SUPPORTED)
          /* write international chunk */
          png_write_iTXt(png_ptr,
                         info_ptr->text[i].compression,
-                         info_ptr->text[i].lang,
                         info_ptr->text[i].key,
-                         info_ptr->text[i].translated_key,
+                         info_ptr->text[i].lang,
+                         info_ptr->text[i].lang_key,
                         info_ptr->text[i].text);
 #else
          png_warning(png_ptr, "Unable to write international text\n");
@@ -204,12 +219,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
      }
      /* If we want a compressed text chunk */
-      else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
      {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
         /* write compressed chunk */
         png_write_zTXt(png_ptr, info_ptr->text[i].key,
-            info_ptr->text[i].text, info_ptr->text[i].text_length,
+            info_ptr->text[i].text, 0,
            info_ptr->text[i].compression);
 #else
         png_warning(png_ptr, "Unable to write compressed text\n");
@@ -223,7 +238,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
         /* write uncompressed chunk */
         png_write_tEXt(png_ptr, info_ptr->text[i].key,
                         info_ptr->text[i].text,
-                         info_ptr->text[i].text_length);
+                         0);
 #else
         png_warning(png_ptr, "Unable to write uncompressed text\n");
 #endif
@@ -242,8 +257,17 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       for (up = info_ptr->unknown_chunks;
            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
            up++)
-         if ((up->location& PNG_HAVE_PLTE) && !(up->location& PNG_HAVE_IDAT))
-       png_write_chunk(png_ptr, up->name, up->data, up->size);
+       {
+         int keep=png_handle_as_unknown(png_ptr, up->name);
+         if (keep != HANDLE_CHUNK_NEVER &&
+            up->location && (up->location & PNG_HAVE_PLTE) &&
+            !(up->location & PNG_HAVE_IDAT) &&
+            ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
   }
 #endif
 }
@@ -268,7 +292,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 #endif
 #if defined(PNG_WRITE_tIME_SUPPORTED)
      /* check to see if user has supplied a time chunk */
-      if (info_ptr->valid & PNG_INFO_tIME &&
+      if ((info_ptr->valid & PNG_INFO_tIME) &&
         !(png_ptr->mode & PNG_WROTE_tIME))
         png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif
@@ -278,12 +302,29 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
      {
         png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
            info_ptr->text[i].compression);
-         if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+         /* an internationalized chunk? */
+         if (info_ptr->text[i].compression > 0)
+         {
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+             /* write international chunk */
+             png_write_iTXt(png_ptr,
+                         info_ptr->text[i].compression,
+                         info_ptr->text[i].key,
+                         info_ptr->text[i].lang,
+                         info_ptr->text[i].lang_key,
+                         info_ptr->text[i].text);
+#else
+             png_warning(png_ptr, "Unable to write international text\n");
+#endif
+             /* Mark this chunk as written */
+             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+         }
+         else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
         {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
            /* write compressed chunk */
            png_write_zTXt(png_ptr, info_ptr->text[i].key,
-               info_ptr->text[i].text, info_ptr->text[i].text_length,
+               info_ptr->text[i].text, 0,
               info_ptr->text[i].compression);
 #else
            png_warning(png_ptr, "Unable to write compressed text\n");
@@ -296,7 +337,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
            /* write uncompressed chunk */
            png_write_tEXt(png_ptr, info_ptr->text[i].key,
-               info_ptr->text[i].text, info_ptr->text[i].text_length);
+               info_ptr->text[i].text, 0);
 #else
            png_warning(png_ptr, "Unable to write uncompressed text\n");
 #endif
@@ -316,8 +357,16 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
       for (up = info_ptr->unknown_chunks;
            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
            up++)
-         if (up->location & PNG_HAVE_IDAT)
+       {
+         int keep=png_handle_as_unknown(png_ptr, up->name);
+         if (keep != HANDLE_CHUNK_NEVER &&
+            up->location && (up->location & PNG_AFTER_IDAT) &&
+            ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
   }
 #endif
   }
@@ -370,8 +419,10 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
   png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
   jmp_buf jmpbuf;
+#endif
 #endif
   png_debug(1, "in png_create_write_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
@@ -383,6 +434,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   {
      return ((png_structp)NULL);
   }
+
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
   if (setjmp(jmpbuf))
 #else
@@ -396,6 +449,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #ifdef USE_FAR_KEYWORD
   png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
 #endif
+#endif
+
 #ifdef PNG_USER_MEM_SUPPORTED
   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
 #endif /* PNG_USER_MEM_SUPPORTED */
@@ -432,17 +487,23 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 void
 png_write_init(png_structp png_ptr)
 {
+#ifdef PNG_SETJMP_SUPPORTED
   jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif

   png_debug(1, "in png_write_init\n");
+#ifdef PNG_SETJMP_SUPPORTED
   /* save jump buffer and error functions */
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif

   /* reset all variables to 0 */
   png_memset(png_ptr, 0, sizeof (png_struct));

+#ifdef PNG_SETJMP_SUPPORTED
   /* restore jump buffer */
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif

   /* initialize zbuf - compression buffer */
   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@@ -554,49 +615,49 @@ png_write_row(png_structp png_ptr, png_bytep row)
      switch (png_ptr->pass)
      {
         case 0:
-            if (png_ptr->row_number & 7)
+            if (png_ptr->row_number & 0x07)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 1:
-            if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 2:
-            if ((png_ptr->row_number & 7) != 4)
+            if ((png_ptr->row_number & 0x07) != 4)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 3:
-            if ((png_ptr->row_number & 3) || png_ptr->width < 3)
+            if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 4:
-            if ((png_ptr->row_number & 3) != 2)
+            if ((png_ptr->row_number & 0x03) != 2)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 5:
-            if ((png_ptr->row_number & 1) || png_ptr->width < 2)
+            if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
            {
               png_write_finish_row(png_ptr);
               return;
            }
            break;
         case 6:
-            if (!(png_ptr->row_number & 1))
+            if (!(png_ptr->row_number & 0x01))
            {
               png_write_finish_row(png_ptr);
               return;
@@ -741,24 +802,13 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)

   if (info_ptr != NULL)
   {
-#if defined(PNG_WRITE_TEXT_SUPPORTED)
-      png_free_text(png_ptr, info_ptr, -1);
-#endif
-#if defined(PNG_WRITE_sCAL_SUPPORTED)
-      png_free_sCAL(png_ptr, info_ptr);
-#endif
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
-      png_free_pCAL(png_ptr, info_ptr);
-#endif
-#if defined(PNG_WRITE_iCCP_SUPPORTED)
-      png_free_iCCP(png_ptr, info_ptr);
-#endif
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-      png_free_spalette(png_ptr, info_ptr, -1);
-#endif
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-      png_free_unknown_chunk(png_ptr, info_ptr, -1);
-#endif
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+      if (png_ptr->num_chunk_list)
+      {
+         png_free(png_ptr, png_ptr->chunk_list);
+         png_ptr->num_chunk_list=0;
+      }

 #ifdef PNG_USER_MEM_SUPPORTED
      png_destroy_struct_2((png_voidp)info_ptr, free_fn);
@@ -785,7 +835,9 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 void
 png_write_destroy(png_structp png_ptr)
 {
+#ifdef PNG_SETJMP_SUPPORTED
   jmp_buf tmp_jmp; /* save jump buffer */
+#endif
   png_error_ptr error_fn;
   png_error_ptr warning_fn;
   png_voidp error_ptr;
@@ -818,8 +870,10 @@ png_write_destroy(png_structp png_ptr)
   png_free(png_ptr, png_ptr->inv_filter_costs);
 #endif

+#ifdef PNG_SETJMP_SUPPORTED
   /* reset structure */
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif

   error_fn = png_ptr->error_fn;
   warning_fn = png_ptr->warning_fn;
@@ -837,7 +891,9 @@ png_write_destroy(png_structp png_ptr)
   png_ptr->free_fn = free_fn;
 #endif

+#ifdef PNG_SETJMP_SUPPORTED
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
 }

 /* Allow the application to select one or more row filters to use. */
@@ -872,14 +928,14 @@ png_set_filter(png_structp png_ptr, int method, int filters)
       */
      if (png_ptr->row_buf != NULL)
      {
-         if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
+         if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
         {
            png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
              (png_ptr->rowbytes + 1));
            png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
         }

-         if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL)
+         if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
         {
            if (png_ptr->prev_row == NULL)
            {
@@ -894,7 +950,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
            }
         }

-         if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL)
+         if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
         {
            if (png_ptr->prev_row == NULL)
            {
@@ -909,7 +965,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
            }
         }

-         if (png_ptr->do_filter & PNG_FILTER_PAETH &&
+         if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
             png_ptr->paeth_row == NULL)
         {
            if (png_ptr->prev_row == NULL)
@@ -1127,3 +1183,87 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
   png_ptr->write_user_transform_fn = write_user_transform_fn;
 }
 #endif
+
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void png_write_png(png_structp png_ptr, png_infop info_ptr,
+                           int transforms,
+                           voidp params)
+{
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+   /* invert the alpha channel from opacity to transparency */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+   /* Write the file header information. */
+   png_write_info(png_ptr, info_ptr);
+
+   /* ------ these transformations don't touch the info structure ------- */
+
+#if defined(PNG_WRITE_INVERT_SUPPORTED)
+   /* invert monochrome pixels */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+       png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+   /* Shift the pixels up to a legal bit depth and fill in
+    * as appropriate to correctly scale the image.
+    */
+   if ((transforms & PNG_TRANSFORM_SHIFT)
+               && (info_ptr->valid & PNG_INFO_sBIT))
+       png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+
+#if defined(PNG_WRITE_PACK_SUPPORTED)
+   /* pack pixels into bytes */
+   if (transforms & PNG_TRANSFORM_PACKING)
+       png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+   /* swap location of alpha bytes from ARGB to RGBA */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+       png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_FILLER_SUPPORTED)
+   /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
+    * RGB (4 channels -> 3 channels). The second parameter is not used.
+    */
+   if (transforms & PNG_TRANSFORM_STRIP_FILLER)
+       png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#endif
+
+#if defined(PNG_WRITE_BGR_SUPPORTED)
+   /* flip BGR pixels to RGB */
+   if (transforms & PNG_TRANSFORM_BGR)
+       png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+   /* swap bytes of 16-bit files to most significant byte first */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+       png_set_swap(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+   /* swap bits of 1, 2, 4 bit packed pixel formats */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+       png_set_packswap(png_ptr);
+#endif
+
+   /* ----------------------- end of transformations ------------------- */
+
+   /* write the bits */
+   if (info_ptr->valid & PNG_INFO_IDAT)
+       png_write_image(png_ptr, info_ptr->row_pointers);
+
+   /* It is REQUIRED to call this to finish writing the rest of the file */
+   png_write_end(png_ptr, info_ptr);
+
+   if(transforms == 0 || params == (voidp)NULL)
+      /* quiet compiler warnings */ return;
+}
+#endif
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,11 +1,11 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 #define PNG_INTERNAL
@@ -140,7 +140,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
            {
               png_byte value;

-               value = (png_byte)(*sp & 0x3);
+               value = (png_byte)(*sp & 0x03);
               v |= (value << shift);
               if (shift == 0)
               {
@@ -172,7 +172,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
            {
               png_byte value;

-               value = (png_byte)(*sp & 0xf);
+               value = (png_byte)(*sp & 0x0f);
               v |= (value << shift);

               if (shift == 0)
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,11 +1,11 @@

 /* pngwutil.c - utilities to write a PNG file
 *
- * libpng 1.0.5h - December 10, 1999
+ * libpng 1.0.6h - April 24, 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
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
 */

 #define PNG_INTERNAL
@@ -133,7 +133,7 @@ png_write_sig(png_structp png_ptr)
      (png_size_t)8 - png_ptr->sig_bytes);
 }

-#if defined(PNG_WRITE_TEXT_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
 /*
 * This pair of functions encapsulates the operation of (a) compressing a
 * text string, and (b) issuing it later as a series of chunk data writes.
@@ -179,7 +179,6 @@ png_text_compress(png_structp png_ptr,
 #else
      png_warning(png_ptr, "Unknown compression type");
 #endif
-      compression = PNG_TEXT_COMPRESSION_zTXt;
   }

   /* We can't write the chunk until we find out how much data we have,
@@ -334,7 +333,8 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
   /* write saved output buffers, if any */
   for (i = 0; i < comp->num_output_ptr; i++)
   {
-      png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],png_ptr->zbuf_size);
+      png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
+         png_ptr->zbuf_size);
      png_free(png_ptr, comp->output_ptr[i]);
   }
   if (comp->max_output_ptr != 0)
@@ -577,15 +577,15 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
   png_byte buf[4];

   png_debug(1, "in png_write_gAMA\n");
-   /* file_gamma is saved in 1/1000000ths */
+   /* file_gamma is saved in 1/100,000ths */
   igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
   png_save_uint_32(buf, igamma);
   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
 }
 #endif
-void
 #ifdef PNG_FIXED_POINT_SUPPORTED
-png_write_gAMA_fixed(png_structp png_ptr, png_uint_32 file_gamma)
+void
+png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_gAMA;
@@ -593,7 +593,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_uint_32 file_gamma)
   png_byte buf[4];

   png_debug(1, "in png_write_gAMA\n");
-   /* file_gamma is saved in 1/1000000ths */
+   /* file_gamma is saved in 1/100,000ths */
   png_save_uint_32(buf, file_gamma);
   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
 }
@@ -641,7 +641,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
   }

   if (compression_type)
-      /* ignore */ ;
+      png_warning(png_ptr, "Unknown compression type in iCCP chunk");

   if (profile == NULL || *profile == '\0')
      profile_len = 0;
@@ -666,7 +666,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
 #if defined(PNG_WRITE_sPLT_SUPPORTED)
 /* write a sPLT chunk */
 void
-png_write_sPLT(png_structp png_ptr, png_spalette_p spalette)
+png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_sPLT;
@@ -676,10 +676,11 @@ png_write_sPLT(png_structp png_ptr, png_spalette_p spalette)
   png_byte entrybuf[10];
   int entry_size = (spalette->depth == 8 ? 6 : 10);
   int palette_size = entry_size * spalette->nentries;
-   png_spalette_entryp ep;
+   png_sPLT_entryp ep;

   png_debug(1, "in png_write_sPLT\n");
-   if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr, spalette->name, &new_name))==0)
+   if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr,
+      spalette->name, &new_name))==0)
   {
      png_warning(png_ptr, "Empty keyword in sPLT chunk");
      return;
@@ -687,8 +688,9 @@ png_write_sPLT(png_structp png_ptr, png_spalette_p spalette)

   /* make sure we include the NULL after the name */
   png_write_chunk_start(png_ptr, (png_bytep) png_sPLT,
-          (png_uint_32)(name_len + 1 + palette_size));
+          (png_uint_32)(name_len + 2 + palette_size));
   png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
+   png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);

   /* loop through each palette entry, writing appropriately */
   for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
@@ -784,15 +786,18 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_cHRM;
 #endif
-   png_uint_32 itemp;
   png_byte buf[32];
+   png_uint_32 itemp;

   png_debug(1, "in png_write_cHRM\n");
-   /* each value is saved in 1/1000000ths */
+   /* each value is saved in 1/100,000ths */
   if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
       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);
@@ -838,22 +843,24 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
 void
-png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,
-   png_uint_32 white_y, png_uint_32 red_x, png_uint_32 red_y,
-   png_uint_32 green_x, png_uint_32 green_y, png_uint_32 blue_x,
-   png_uint_32 blue_y)
+png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
+   png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
+   png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
+   png_fixed_point blue_y)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_cHRM;
 #endif
-   png_uint_32 itemp;
   png_byte buf[32];

   png_debug(1, "in png_write_cHRM\n");
-   /* each value is saved int 1/1000000ths */
+   /* each value is saved in 1/100,000ths */
   if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
   {
-      png_warning(png_ptr, "Invalid cHRM white point specified");
+      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);
@@ -861,7 +868,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,

   if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
   {
-      png_warning(png_ptr, "Invalid cHRM red point specified");
+      png_warning(png_ptr, "Invalid cHRM fixed red point specified");
      return;
   }
   png_save_uint_32(buf + 8, red_x);
@@ -869,7 +876,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,

   if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
   {
-      png_warning(png_ptr, "Invalid cHRM green point specified");
+      png_warning(png_ptr, "Invalid fixed cHRM green point specified");
      return;
   }
   png_save_uint_32(buf + 16, green_x);
@@ -877,7 +884,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,

   if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
   {
-      png_warning(png_ptr, "Invalid cHRM blue point specified");
+      png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
      return;
   }
   png_save_uint_32(buf + 24, blue_x);
@@ -1108,7 +1115,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
   {
      png_free(png_ptr, *new_key);
      *new_key=NULL;
-      png_chunk_warning(png_ptr, "zero length keyword");
+      png_chunk_warning(png_ptr, "Zero length keyword");
   }

   if (key_len > 79)
@@ -1143,6 +1150,8 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,

   if (text == NULL || *text == '\0')
      text_len = 0;
+   else
+      text_len = png_strlen(text);

   /* make sure we include the 0 after the key */
   png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
@@ -1190,6 +1199,8 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
      return;
   }

+   text_len = png_strlen(text);
+
   png_free(png_ptr, new_key);

   /* compute the compressed data; do it now for the length */
@@ -1215,57 +1226,48 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
 /* write an iTXt chunk */
 void
 png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
-    png_charp lang, png_charp translated_key, png_charp text)
+    png_charp lang, png_charp lang_key, png_charp text)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_iTXt;
 #endif
-   png_size_t lang_len, key_len, translated_key_len, text_len;
+   png_size_t lang_len, key_len, lang_key_len, text_len;
   png_charp new_lang, new_key;
   png_byte cbuf[2];
   compression_state comp;

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

-   translated_key_len = png_strlen(translated_key);
-   text_len = png_strlen(text);
-
+   if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
+   {
+      png_warning(png_ptr, "Empty keyword in iTXt chunk");
+      return;
+   }
   if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
      &new_lang))==0)
   {
      png_warning(png_ptr, "Empty language field in iTXt chunk");
      return;
   }
-   if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
-   {
-      png_warning(png_ptr, "Empty keyword in iTXt chunk");
-      return;
-   }
+   lang_key_len = png_strlen(lang_key);
+   text_len = png_strlen(text);

   if (text == NULL || *text == '\0')
      text_len = 0;

   /* compute the compressed data; do it now for the length */
-   text_len = png_text_compress(png_ptr, text, text_len, compression, &comp);
+   text_len = png_text_compress(png_ptr, text, text_len, compression-2, &comp);

   /* make sure we include the compression flag, the compression byte,
-    * and the NULs after the key, lang, and translated_key parts */
-   png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
-          (png_uint_32)(2 + lang_len+1 + key_len+1 + translated_key_len +
-          text_len));
+    * and the NULs after the key, lang, and lang_key parts */

-   /* set the compression bits */
-   if (compression == PNG_TEXT_COMPRESSION_NONE)
-   {
-       cbuf[0] = 0;
-       cbuf[1] = 0;
-   }
-   else /* compression == PNG_TEXT_COMPRESSION_zTXt */
-   {
-       cbuf[0] = 1;
-       cbuf[1] = 0;
-   }
-   png_write_chunk_data(png_ptr, cbuf, 2);
+   png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+          (png_uint_32)(
+        5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+        + key_len
+        + lang_len
+        + lang_key_len
+        + text_len));

   /*
    * We leave it to the application to meet PNG-1.0 requirements on the
@@ -1274,9 +1276,19 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
    * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
    */
   png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
+
+   /* set the compression flag */
+   if (compression == PNG_ITXT_COMPRESSION_NONE || \
+       compression == PNG_TEXT_COMPRESSION_NONE)
+       cbuf[0] = 0;
+   else /* compression == PNG_ITXT_COMPRESSION_zTXt */
+       cbuf[0] = 1;
+   /* set the compression method */
+   cbuf[1] = 0;
+   png_write_chunk_data(png_ptr, cbuf, 2);
+
   png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
-   png_write_chunk_data(png_ptr, (png_bytep)translated_key,
-       translated_key_len);
+   png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
   png_write_chunk_data(png_ptr, '\0', 1);

   png_write_compressed_data_out(png_ptr, &comp);
@@ -1373,9 +1385,9 @@ 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, png_charp unit, double width,double height)
+png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_sCAL;
@@ -1387,19 +1399,20 @@ png_write_sCAL(png_structp png_ptr, png_charp unit, double width,double height)

   sprintf(wbuf, "%12.12e", width);
   sprintf(hbuf, "%12.12e", height);
-   total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+   total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);

   png_debug1(3, "sCAL total length = %d\n", total_len);
   png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
-   png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1);
+   png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
   png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
   png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));

   png_write_chunk_end(png_ptr);
 }
-#endif
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
 void
-png_write_sCAL_s(png_structp png_ptr, png_charp unit, png_charp width,
+png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
   png_charp height)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
@@ -1408,21 +1421,23 @@ png_write_sCAL_s(png_structp png_ptr, png_charp 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);
-   total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+   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);
   png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
-   png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1);
+   png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
   png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
   png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));

   png_write_chunk_end(png_ptr);
 }
 #endif
+#endif
+#endif

 #if defined(PNG_WRITE_pHYs_SUPPORTED)
 /* write the pHYs chunk */
@@ -1730,7 +1745,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
               i += png_pass_inc[pass])
            {
               sp = row + (png_size_t)(i >> 3);
-               value = (int)(*sp >> (7 - (int)(i & 7))) & 0x1;
+               value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
               d |= (value << shift);

               if (shift == 0)
@@ -1764,7 +1779,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
               i += png_pass_inc[pass])
            {
               sp = row + (png_size_t)(i >> 2);
-               value = (*sp >> ((3 - (int)(i & 3)) << 1)) & 0x3;
+               value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
               d |= (value << shift);

               if (shift == 0)
@@ -1797,7 +1812,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
               i += png_pass_inc[pass])
            {
               sp = row + (png_size_t)(i >> 1);
-               value = (*sp >> ((1 - (int)(i & 1)) << 2)) & 0xf;
+               value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
               d |= (value << shift);

               if (shift == 0)
@@ -1904,7 +1919,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
   /* We don't need to test the 'no filter' case if this is the only filter
    * that has been chosen, as it doesn't actually do anything to the data.
    */
-   if (filter_to_do & PNG_FILTER_NONE &&
+   if ((filter_to_do & PNG_FILTER_NONE) &&
       filter_to_do != PNG_FILTER_NONE)
   {
      png_bytep rp;
--- a/scripts/build.bat
+++ b/scripts/build.bat
@@ -1,2 +0,0 @@
-make -fmakefile.bor -B -DMODEL=m %1 %2 %3 libpng >buildm.out
-make -fmakefile.bor -B -DMODEL=l %1 %2 %3 libpng >buildl.out
--- a/scripts/libpng.icc
+++ b/scripts/libpng.icc
@@ -0,0 +1,43 @@
+// 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"
+   }
+}
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -0,0 +1,151 @@
+# Makefile for libpng
+# 32-bit Borland C++ (Note: All modules are compiled in C mode)
+# To build the library, do:
+#       "make -fmakefile.bc32"
+#
+# ---------- 32-bit Borland C++ ----------
+
+### Absolutely necessary for this makefile to work
+.AUTODEPEND
+
+## Where zlib.h, zconf.h and zlib.lib are
+ZLIB_DIR=..\zlib
+
+
+## Compiler, linker and lib stuff
+CC=bcc32
+LD=bcc32
+LIB=tlib
+
+#TARGET_CPU=6
+# 3 = 386, 4 = 486, 5 = Pentium etc.
+!ifndef TARGET_CPU
+TARGET_CPU=5
+!endif
+
+# Use this if you don't want Borland's fancy exception handling
+NOEHLIB=noeh32.lib
+
+!ifdef DEBUG
+CDEBUG=-v
+LDEBUG=-v
+!else
+CDEBUG=
+LDEBUG=
+!endif
+
+# STACKOFLOW=1
+!ifdef STACKOFLOW
+CDEBUG=$(CDEBUG) -N
+LDEBUG=$(LDEBUG) -N
+!endif
+
+# -X- turn on dependency generation in the object file
+# -w  set all warnings on
+# -O2 optimize for speed
+# -Z  global optimization
+CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(CDEBUG)
+
+# -M  generate map file
+LDFLAGS=-M -L$(ZLIB_DIR) $(LDEBUG)
+
+
+## Variables
+OBJS = \
+	png.obj \
+	pngerror.obj \
+	pngget.obj \
+	pngmem.obj \
+	pngpread.obj \
+	pngread.obj \
+	pngrio.obj \
+	pngrtran.obj \
+	pngrutil.obj \
+	pngset.obj \
+	pngtrans.obj \
+	pngwio.obj \
+	pngwrite.obj \
+	pngwtran.obj \
+	pngwutil.obj
+
+LIBOBJS = \
+	+png.obj \
+	+pngerror.obj \
+	+pngget.obj \
+	+pngmem.obj \
+	+pngpread.obj \
+	+pngread.obj \
+	+pngrio.obj \
+	+pngrtran.obj \
+	+pngrutil.obj \
+	+pngset.obj \
+	+pngtrans.obj \
+	+pngwio.obj \
+	+pngwrite.obj \
+	+pngwtran.obj \
+	+pngwutil.obj
+
+LIBNAME=libpng.lib
+
+
+## Implicit rules
+# Braces let make "batch" calls to the compiler,
+# 2 calls instead of 12; space is important.
+.c.obj:
+	$(CC) $(CFLAGS) -c {$*.c }
+
+.c.exe:
+	$(CC) $(CFLAGS) $(LDFLAGS) $*.c $(LIBNAME) zlib.lib $(NOEHLIB)
+
+.obj.exe:
+	$(LD) $(LDFLAGS) $*.obj $(LIBNAME) zlib.lib $(NOEHLIB)
+
+
+## Major targets
+all: libpng pngtest
+
+libpng: $(LIBNAME)
+
+pngtest: pngtest.exe
+
+test: pngtest.exe
+	pngtest
+
+
+## Minor Targets
+
+png.obj: png.c
+pngerror.obj: pngerror.c
+pngget.obj: pngget.c
+pngmem.obj: pngmem.c
+pngpread.obj: pngpread.c
+pngread.obj: pngread.c
+pngrio.obj: pngrio.c
+pngrtran.obj: pngrtran.c
+pngrutil.obj: pngrutil.c
+pngset.obj: pngset.c
+pngtrans.obj: pngtrans.c
+pngwio.obj: pngwio.c
+pngwrite.obj: pngwrite.c
+pngwtran.obj: pngwtran.c
+pngwutil.obj: pngwutil.c
+
+
+$(LIBNAME): $(OBJS)
+	-del $(LIBNAME)
+	$(LIB) $(LIBNAME) @&&|
+$(LIBOBJS), libpng
+|
+
+
+# Clean up anything else you want
+clean:
+	-del *.obj
+	-del *.exe
+	-del *.lib
+	-del *.lst
+	-del *.map
+	-del *.tds
+
+
+# End of makefile for libpng
--- a/scripts/makefile.bd32
+++ b/scripts/makefile.bd32
@@ -1,5 +1,5 @@
 # Makefile for png32bd.dll
-# ------------- Borland C++ 4.5 -------------
+# ------------- 32-bit Borland C++ -------------

 # This makefile expects to find zlib.h and zlib32bd.lib in the
 # $(ZLIBDIR) directory.
@@ -12,42 +12,65 @@
 # compress and uncompress functions, nor any of the gz... functions,
 # since libpng does not call them.

-ZLIBDIR=..\zlib112
+.AUTODEPEND
+
+ZLIBDIR=..\zlib
 ZLIB=zlib32bd.lib
 PNGDLL=png32bd.dll
+PNGLIB=png32bd.lib

-CFLAGS= -ps -O2 -C -K -N- -k- -d -3 -r- -w-par -w-aus -WDE -I$(ZLIBDIR)
-CC=f:\bc45\bin\bcc32
-LINKFLAGS= -Tpd -aa -c
-LINK=f:\bc45\bin\tlink32
-LIBDIR=f:\bc45\lib
-IMPLIB=f:\bc45\bin\implib
+CC=bcc32
+CFLAGS= -ps -O2 -N- -k- -d -r- -w-par -w-aus -I$(ZLIBDIR) \
+  -DPNG_NO_GLOBAL_ARRAYS #-DPNG_DEBUG=5
+#LINK=tlink32
+#LINK=ilink32
+LINK=bcc32
+#LINKFLAGS= -Tpd -aa -c
+LINKFLAGS= -WDE
+IMPLIB=implib
+
+# Use this if you don't want Borland's fancy exception handling
+NOEHLIB=noeh32.lib

-.autodepend
 .c.obj:
-        $(CC) -c $(CFLAGS) $<
- 
-OBJ1=png.obj pngerror.obj pngget.obj pngmem.obj pngpread.obj 
-OBJ2=pngread.obj pngrio.obj pngrtran.obj pngrutil.obj pngset.obj 
+	$(CC) -c $(CFLAGS) $<
+
+.c.exe:
+	$(CC) $(CFLAGS) $< $(PNGLIB) $(NOEHLIB)
+
+
+OBJ1=png.obj pngerror.obj pngget.obj pngmem.obj pngpread.obj
+OBJ2=pngread.obj pngrio.obj pngrtran.obj pngrutil.obj pngset.obj
 OBJ3=pngtrans.obj pngwio.obj pngwrite.obj pngwtran.obj pngwutil.obj

 all: $(PNGDLL)

+test: pngtest.exe
+	pngtest
+
+
 $(PNGDLL): $(OBJ1) $(OBJ2) $(OBJ3) $(ZLIBDIR)\$(ZLIB)
-        $(LINK) @&&|
-$(LINKFLAGS) $(LIBDIR)\c0d32 +
-$(OBJ1) +
-$(OBJ2) +
+	$(LINK) @&&|
+$(LINKFLAGS)
+-e$(PNGDLL)
+$(OBJ1)
+$(OBJ2)
 $(OBJ3)
-$@
-x
-$(ZLIBDIR)\$(ZLIB) $(LIBDIR)\import32 $(LIBDIR)\cw32
-|,&&|
-LIBRARY $(@B)
-EXETYPE WINDOWS
-CODE PRELOAD MOVEABLE DISCARDABLE
-DATA PRELOAD MOVEABLE MULTIPLE
+$(ZLIBDIR)\$(ZLIB)
+$(NOEHLIB)
 |
-        $(IMPLIB) -c $(@R).lib $@
+	$(IMPLIB) -c $(@R).lib $@
+
+
+# Clean up anything else you want
+clean:
+	-del *.obj
+	-del *.dll
+	-del *.exe
+	-del *.lib
+	-del *.lst
+	-del *.map
+	-del *.tds
+

 # End of makefile for png32bd.dll
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -1,9 +1,14 @@
 # makefile for libpng on BeOS x86 ELF with gcc
 # modified from makefile.linux by Sander Stoks
 # Copyright (C) 1996, 1997 Andreas Dilger
-# Copyright (C) 1999 Greg Roelofs
+# Copyright (C) 1999, 2000 Greg Roelofs
 # For conditions of distribution and use, see copyright notice in png.h

+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
+# have to change it.
+PNGMAJ = 10
+PNGMIN = 6h
+PNGVER = $(PNGMAJ).$(PNGMIN)
 CC=gcc

 # Where the zlib library and include files are located
@@ -28,11 +33,6 @@ LDFLAGS=-L. -Wl,-soname=libpng.so.$(PNGMAJ) -L$(ZLIBLIB) -lz -lm
 RANLIB=ranlib
 #RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
-# have to change it.
-PNGMAJ = 2
-PNGMIN = 1.0.5h
-PNGVER = $(PNGMAJ).$(PNGMIN)

 # where make install puts libpng.a, libpng.so*, and png.h
 prefix=/usr/local
--- a/scripts/makefile.borland
+++ b/scripts/makefile.borland
@@ -1,39 +1,38 @@
 # Makefile for libpng
-# Borland C++ 4.5 (Note: All modules are compiled in C mode)
-# Will work with C++ 4.02 also
-# To build the library, do: 
-#       "make -fmakefile.borland -DMODEL=m"
-# or:   "make -fmakefile.borland -DMODEL=l"
+# 16-bit Borland C++ (Note: All modules are compiled in C mode)
+# To build the library, do:
+#       "make -fmakefile.bor -DMODEL=c"
+# or:   "make -fmakefile.bor -DMODEL=l"
 #
-# ------------- Borland C++ 4.5 -------------
+# ------------ Borland C++ ------------

 ### Absolutely necessary for this makefile to work
 .AUTODEPEND

-## Useful user options
+## Where zlib.h, zconf.h and zlib_MODEL.lib are
+ZLIB_DIR=..\zlib

-# Usually defined in builtins.mak or the environment
-# Currently unused.
-!ifndef BCROOT
-BCROOT=N:\BC45
-!endif

-# Where zlib.h and zconf.h and zlib.lib are
-ZLIB_PATH=..\zlib
+## Compiler, linker and lib stuff
+CC=bcc
+LD=bcc
+LIB=tlib

 !ifndef MODEL
 MODEL=l
 !endif

+MODEL_ARG=-m$(MODEL)
+
 #TARGET_CPU=3
 # 2 = 286, 3 = 386, etc.
 !ifndef TARGET_CPU
 TARGET_CPU=2
 !endif

-
-# Use this if you don't want Borland's fancy exception handling.
-NOEHLIB=noeh$(MODEL).lib
+# Use this if you don't want Borland's fancy exception handling
+# (for Borland C++ 4.0 or later)
+#NOEHLIB=noeh$(MODEL).lib

 !ifdef DEBUG
 CDEBUG=-v
@@ -49,59 +48,50 @@ CDEBUG=$(CDEBUG) -N
 LDEBUG=$(LDEBUG) -N
 !endif

-
-## Compiler, linker, and lib stuff
-CC=bcc
-LD=bcc
-LIB=tlib
-
-MODELARG=-m$(MODEL)
-
-# -X- turns on dependency generation in the object file
-# -w  sets all warnings on
+# -X- turn on dependency generation in the object file
+# -w  set all warnings on
 # -O2 optimize for speed
 # -Z  global optimization
-CFLAGS=-O2 -Z -X- -w -I$(ZLIB_PATH) -$(TARGET_CPU) $(MODELARG) $(CDEBUG)
+CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)

 # -M  generate map file
-LDFLAGS=-M $(LDEBUG)
+LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)

-O=obj

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

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

 LIBNAME=libpng$(MODEL).lib

@@ -113,10 +103,12 @@ LIBNAME=libpng$(MODEL).lib
 	$(CC) $(CFLAGS) -c {$*.c }

 .c.exe:
-	$(CC) $(CFLAGS) $(LDFLAGS) $*.c
+	$(CC) $(CFLAGS) $(LDFLAGS) $*.c $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)


 ## Major targets
+all: libpng pngtest
+
 libpng: $(LIBNAME)

 pngtest: pngtest$(MODEL).exe
@@ -128,17 +120,17 @@ test: pngtest$(MODEL).exe
 ## Minor Targets

 png.obj: png.c
-pngset.obj: pngset.c
+pngerror.obj: pngerror.c
 pngget.obj: pngget.c
-pngread.obj: pngread.c
+pngmem.obj: pngmem.c
 pngpread.obj: pngpread.c
+pngread.obj: pngread.c
+pngrio.obj: pngrio.c
 pngrtran.obj: pngrtran.c
 pngrutil.obj: pngrutil.c
-pngerror.obj: pngerror.c
-pngmem.obj: pngmem.c
-pngrio.obj: pngrio.c
-pngwio.obj: pngwio.c
+pngset.obj: pngset.c
 pngtrans.obj: pngtrans.c
+pngwio.obj: pngwio.c
 pngwrite.obj: pngwrite.c
 pngwtran.obj: pngwtran.c
 pngwutil.obj: pngwutil.c
@@ -155,14 +147,16 @@ pngtest$(MODEL).obj: pngtest.c
 	$(CC) $(CFLAGS) -opngtest$(MODEL) -c pngtest.c

 pngtest$(MODEL).exe: pngtest$(MODEL).obj
-	$(CC) $(MODELARG) $(LDFLAGS) -L$(ZLIB_PATH) pngtest$(MODEL).obj $(LIBNAME) zlib$(MODEL).lib $(NOEHLIB)
+	$(LD) $(LDFLAGS) pngtest$(MODEL).obj $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)


 # Clean up anything else you want
 clean:
 	-del *.obj
+	-del *.exe
 	-del *.lib
 	-del *.lst
+	-del *.map


 # End of makefile for libpng
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -11,10 +11,10 @@ prefix=/usr/local
 ZLIBLIB=../zlib
 ZLIBINC=../zlib

-# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
 # have to change it.
-PNGMAJ = 2
-PNGMIN = 1.0.5h
+PNGMAJ = 10
+PNGMIN = 6h
 PNGVER = $(PNGMAJ).$(PNGMIN)

 CC=cc
--- a/scripts/makefile.gcc
+++ b/scripts/makefile.gcc
@@ -0,0 +1,66 @@
+# makefile for libpng using gcc (generic, static library)
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# Copyright (C) 2000 Cosmin Truta
+# 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 = $(CC)
+AR = ar rcs
+RANLIB = ranlib
+RM = rm -f
+
+CDEBUG = -g -DPNG_DEBUG=5
+LDDEBUG =
+CRELEASE = -O2
+LDRELEASE = -s
+CFLAGS = -I$(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)
+
+clean:
+	$(RM) *$(O) libpng$(A) pngtest$(E) 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.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -0,0 +1,126 @@
+# makefile for libpng on Linux ELF with gcc using MMX assembler code
+# Copyright (C) 1996, 1997 Andreas Dilger
+# Copyright (C) 1998-2000 Greg Roelofs
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=gcc
+
+# where "make install" puts libpng.a, libpng.so*, png.h and pngconf.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
+
+ALIGN=
+# for i386:
+#ALIGN=-malign-loops=2 -malign-functions=2
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+	-Wmissing-declarations -Wtraditional -Wcast-align \
+	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+
+# 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  # $(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
+
+RANLIB=ranlib
+#RANLIB=echo
+
+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
+# have to change it.
+PNGMAJ = 10
+PNGMIN = 6h
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+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 pnggccrd.o
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c
+
+all: libpng.a libpng.so pngtest
+
+pnggccrd.o:	png.h pngconf.h pngasmrd.h
+	@echo ""
+	@echo '    You can ignore the single "control reaches end of non-void function"'
+	@echo '    warning and multiple "<variable> defined but not used" warnings:'
+	@echo ""
+	$(CC) -c $(CFLAGS) -o $@ $*.c
+
+pnggccrd.pic.o:	png.h pngconf.h pngasmrd.h
+	@echo ""
+	@echo '    You can ignore the single "control reaches end of non-void function"'
+	@echo '    warning and multiple "<variable> defined but not used" warnings:'
+	@echo ""
+	$(CC) -c $(CFLAGS) -fPIC -o $@ pnggccrd.c
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.so: libpng.so.$(PNGMAJ)
+	ln -sf libpng.so.$(PNGMAJ) libpng.so
+
+libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
+	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+
+libpng.so.$(PNGVER): $(OBJSDLL)
+	$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
+	 $(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc
+
+pngtest: pngtest.o libpng.so
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a libpng.so.$(PNGVER)
+	-@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 $(INCPATH)/pngconf.h
+	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
+	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
+	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
+	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
+	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.ibmc
+++ b/scripts/makefile.ibmc
@@ -0,0 +1,71 @@
+# Makefile for libpng (static)
+# IBM C version 3.x for Win32 and OS/2
+# Copyright (C) 2000 Cosmin Truta
+# Notes:
+#   Derived from makefile.std
+#   All modules are compiled in C mode
+#   Tested with IBM C 3.6.5 under Win32, expected to work under OS/2 too
+#   Can be easily adapted for IBM VisualAge/C++ for AIX
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Location of the zlib library and include files
+ZLIBINC = ../zlib
+ZLIBLIB = ../zlib
+
+# Compiler, linker, lib and other tools
+CC = icc
+LD = ilink
+AR = ilib
+RM = del
+
+CFLAGS = -I$(ZLIBINC) -O2 -W3
+LDFLAGS =
+
+# File extensions
+O=.obj
+A=.lib
+E=.exe
+
+# 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$(O)
+
+LIBS = libpng$(A) $(ZLIBLIB)/zlib$(A)
+
+# Targets
+all: libpng$(A) pngtest$(E)
+
+libpng$(A): $(OBJS)
+	$(AR) -out:$@ $(OBJS)
+
+test: pngtest$(E)
+	pngtest$(E)
+
+pngtest: pngtest$(E)
+
+pngtest$(E): pngtest$(O) libpng$(A)
+	$(LD) $(LDFLAGS) pngtest$(O) $(LIBS)
+
+clean:
+	$(RM) *$(O)
+	$(RM) libpng$(A)
+	$(RM) pngtest$(E)
+	$(RM) pngout.png
+
+png$(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.linux
+++ b/scripts/makefile.linux
@@ -1,6 +1,6 @@
 # makefile for libpng on Linux ELF with gcc
 # Copyright (C) 1996, 1997 Andreas Dilger
-# Copyright (C) 1998, 1999 Greg Roelofs
+# Copyright (C) 1998-2000, Greg Roelofs
 # For conditions of distribution and use, see copyright notice in png.h

 CC=gcc
@@ -31,10 +31,10 @@ LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
 RANLIB=ranlib
 #RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
 # have to change it.
-PNGMAJ = 2
-PNGMIN = 1.0.5h
+PNGMAJ = 10
+PNGMIN = 6h
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
@@ -74,7 +74,8 @@ test: pngtest
 	./pngtest

 install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH) $(LIBPATH)
+	-@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 $(INCPATH)/pngconf.h
 	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -4,8 +4,8 @@
 # Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib

 # -------- Microsoft C 5.1 and later, does not use assembler code -----
-MODEL=-AL
-CFLAGS=-Oait -Gs -nologo -W3 $(MODEL) -I..\zlib
+MODEL=L
+CFLAGS=-Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -2,7 +2,7 @@
 # Contributed by Mike Hopkirk (hops@sco.com) modified from Makefile.lnx
 #   force ELF build dynamic linking, SONAME setting in lib and RPATH in app
 # Copyright (C) 1996, 1997 Andreas Dilger
-# Copyright (C) 1998 Greg Roelofs
+# Copyright (C) 1998, 2000 Greg Roelofs
 # For conditions of distribution and use, see copyright notice in png.h

 CC=cc
@@ -22,10 +22,10 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=ranlib
 RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
 # have to change it.
-PNGMAJ = 2
-PNGMIN = 1.0.5h
+PNGMAJ = 10
+PNGMIN = 6h
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -0,0 +1,90 @@
+# makefile for libpng, SGI IRIX with gcc
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# For conditions of distribution and use, see copyright notice in png.h
+
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+
+# Where the zlib library and include files are located
+ZLIBLIB=/usr/local/lib32
+ZLIBINC=/usr/local/include
+#ZLIBLIB=../zlib
+#ZLIBINC=../zlib
+
+CC=gcc
+
+WARNMORE=
+CFLAGS=-I$(ZLIBINC) -O2 $(WARNMORE) -fPIC -mabi=n32 # -g -DPNG_DEBUG=5
+# zlib must also be compiled with n32
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
+LDSHARED=gcc -shared
+
+VER=1.0.6h
+LIBS=libpng.so.1.0.6h
+SHAREDLIB=libpng.so
+libdir=$(prefix)/lib32
+
+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 $(SHAREDLIB).$(VER) pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@  $(OBJS)
+	$(RANLIB) $@
+
+$(SHAREDLIB).$(VER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
+
+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
+	cp $(SHAREDLIB).$(VER) $(libdir); chmod 755 $(SHAREDLIB).$(VER)
+	cd $(libdir); if test -f $(SHAREDLIB).$(VER); then \
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1; \
+	ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
+	ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).1; \
+	(ldconfig || true)  >/dev/null 2>&1; \
+	fi
+
+clean:
+	rm -f *.o libpng.a pngtest pngout.png
+
+# 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.solaris
+++ b/scripts/makefile.solaris
@@ -1,22 +1,11 @@
 # makefile for libpng on Solaris 2.x with gcc
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1996, 1997 Andreas Dilger
-# Copyright (C) 1998 Greg Roelofs
+# Copyright (C) 1998, 2000 Greg Roelofs
 # For conditions of distribution and use, see copyright notice in png.h

 CC=gcc

-case "`type ld`" in *ucb*) echo "
-# WARNING:
-# The commands "CC" and "LD" must NOT refer to /usr/ucb/cc and
-# /usr/ucb/ld.  If they do, you need to adjust your PATH environment
-# variable to put /usr/ccs/bin ahead of /usr/ucb.  The environment
-# variable LD_LIBRARY_PATH should not be set at all.  If it is,
-# things are likely to break because of the libucb dependency that
-# is created.
-" ;;
-esac
-
 # Where make install puts libpng.a, libpng.so*, and png.h
 prefix=/usr/local

@@ -39,10 +28,10 @@ LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=ranlib
 RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 10.  You should not
 # have to change it.
-PNGMAJ = 2
-PNGMIN = 1.0.5h
+PNGMAJ = 10
+PNGMIN = 6h
 PNGVER = $(PNGMAJ).$(PNGMIN)

 INCPATH=$(prefix)/include
@@ -72,6 +61,18 @@ libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
 	ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)

 libpng.so.$(PNGVER): $(OBJSDLL)
+	@case "`type ld`" in *ucb*) \
+	echo; \
+	echo '## WARNING:'; \
+	echo '## The commands "CC" and "LD" must NOT refer to /usr/ucb/cc'; \
+	echo '## and /usr/ucb/ld.  If they do, you need to adjust your PATH'; \
+	echo '## environment variable to put /usr/ccs/bin ahead of /usr/ucb.'; \
+	echo '## The environment variable LD_LIBRARY_PATH should not be set'; \
+	echo '## at all.  If it is, things are likely to break because of'; \
+	echo '## the libucb dependency that is created.'; \
+	echo; \
+	;; \
+	esac
 	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
 	 -o libpng.so.$(PNGVER) $(OBJSDLL) -lz

--- a/scripts/makefile.turboc3
+++ b/scripts/makefile.turboc3
@@ -1,15 +1,17 @@
 # Makefile for libpng
-# TurboC++ 3.0 (Note: All modules are compiled in C mode)
+# TurboC/C++ (Note: All modules are compiled in C mode)

-# To use, do "make -fmakefile.turboc3"
+# To use, do "make -fmakefile.tc3"

-# ------------- Turbo C++ 3.0 -------------
-MODEL=-ml
-CFLAGS=-O2 -Z $(MODEL) -I..\zlib
+# ------ Turbo C 3.00 (can be modified to work with earlier versions)------
+
+MODEL=l
+CFLAGS=-O2 -Z -m$(MODEL) -I..\zlib
+#CFLAGS=-D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
 CC=tcc
 LD=tcc
 LIB=tlib
-LDFLAGS=$(MODEL) -L..\zlib
+LDFLAGS=-m$(MODEL) -L..\zlib
 O=.obj
 E=.exe

@@ -21,7 +23,12 @@ OBJSL1 = +png$(O) +pngset$(O) +pngget$(O) +pngrutil$(O) +pngtrans$(O)
 OBJSL2 = +pngwutil$(O) +pngmem$(O) +pngpread$(O) +pngread$(O) +pngerror$(O)
 OBJSL3 = +pngwrite$(O) +pngrtran$(O) +pngwtran$(O) +pngrio$(O) +pngwio$(O)

-all: libpng.lib pngtest.exe
+all: libpng$(MODEL).lib pngtest$(E)
+
+pngtest: pngtest$(E)
+
+test: pngtest$(E)
+	pngtest$(E)

 png$(O): png.h pngconf.h
 		  $(CC) -c $(CFLAGS) $*.c
@@ -71,12 +78,12 @@ pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c

-libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
-	$(LIB) libpng +$(OBJSL1)
-	$(LIB) libpng +$(OBJSL2)
-	$(LIB) libpng +$(OBJSL3)
+libpng$(MODEL).lib: $(OBJS1) $(OBJS2) $(OBJS3)
+	$(LIB) libpng$(MODEL) +$(OBJSL1)
+	$(LIB) libpng$(MODEL) +$(OBJSL2)
+	$(LIB) libpng$(MODEL) +$(OBJSL3)

-pngtest$(E): pngtest$(O) libpng.lib
-	$(CC) $(LDFLAGS) pngtest.obj libpng.lib zlib.lib
+pngtest$(E): pngtest$(O) libpng$(MODEL).lib
+	$(LD) $(LDFLAGS) pngtest.obj libpng$(MODEL).lib zlib_$(MODEL).lib

 # End of makefile for libpng
--- a/scripts/makefile.vcawin32
+++ b/scripts/makefile.vcawin32
@@ -11,7 +11,6 @@

 # If you don't want to use assembler code, use makefile.vcwin32 instead.

-MODEL=- 
 CFLAGS=-DPNG_USE_PNGVCRD -Ox -GA3s -nologo -W3 -I..\zlib

 CC=cl
@@ -81,6 +80,7 @@ pngwutil$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)

 libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
+	echo something to del > libpng.lib
 	del libpng.lib
 	lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

--- a/scripts/makefile.vcwin32
+++ b/scripts/makefile.vcwin32
@@ -7,7 +7,6 @@
 # ---------- Microsoft Visual C++ 4.0 and later, no assembler code------
 # If you want to use assembler code, use makefile.vcawin32 instead.

-MODEL=- 
 CFLAGS= -Ox -GA3s -nologo -W3 -I..\zlib

 CC=cl
@@ -74,6 +73,7 @@ pngwutil$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)

 libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
+	echo something to del > libpng.lib
 	del libpng.lib
 	lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

--- a/scripts/pngdef.pas
+++ b/scripts/pngdef.pas
@@ -3,8 +3,8 @@ unit pngdef;
 interface

 const
-  PNG_LIBPNG_VER_STRING = '1.0.5h';
-  PNG_LIBPNG_VER        =  10006;
+  PNG_LIBPNG_VER_STRING = '1.0.6h';
+  PNG_LIBPNG_VER        =  10007;

 type
  png_uint_32 = Cardinal;
@@ -56,6 +56,9 @@ type
  png_write_status_ptr = procedure(png_ptr: Pointer;
                           row_number: png_uint_32; pass: int);
             stdcall;
+  png_user_chunk_ptr = procedure(png_ptr: Pointer;
+                             data: png_unknown_chunkp);
+             stdcall;
  png_user_transform_ptr = procedure(png_ptr: Pointer;
                             row_info: Pointer; data: png_bytep);
             stdcall;
@@ -360,6 +363,9 @@ function png_get_rgb_to_gray_status(png_ptr: png_structp);
 function png_get_rowbytes(png_ptr: png_structp; info_ptr: png_infop):
             png_uint_32;
             stdcall;
+function png_get_rows(png_ptr: png_structp; info_ptr: png_infop):
+             png_bytepp;
+             stdcall;
 function png_get_sBIT(png_ptr: png_structp; info_ptr: png_infop;
             var sig_bits: png_color_8p): png_uint_32;
             stdcall;
@@ -380,6 +386,9 @@ function png_get_text(png_ptr: png_structp; info_ptr: png_infop;
             var text_ptr: png_textp; var num_text: int):
             png_uint_32;
             stdcall;
+function png_get_user_chunk_ptr(png_ptr: png_structp):
+             png_voidp;
+             stdcall;
 function png_get_valid(png_ptr: png_structp; info_ptr: png_infop;
             flag: png_uint_32): png_uint_32;
             stdcall;
@@ -441,6 +450,10 @@ procedure png_set_cHRM(png_ptr: png_structp; info_ptr: png_infop;
             white_x, white_y, red_x, red_y, green_x, green_y,
             blue_x, blue_y: double);
             stdcall;
+procedure png_set_cHRM_fixed(png_ptr: png_structp; info_ptr: png_infop;
+             white_x, white_y, red_x, red_y, green_x, green_y,
+             blue_x, blue_y: png_fixed_point);
+             stdcall;
 procedure png_set_compression_level(png_ptr: png_structp; level: int);
             stdcall;
 procedure png_set_compression_mem_level(png_ptr: png_structp;
@@ -480,6 +493,9 @@ procedure png_set_flush(png_ptr: png_structp; nrows: int);
 procedure png_set_gAMA(png_ptr: png_structp; info_ptr: png_infop;
             file_gamma: double);
             stdcall;
+procedure png_set_gAMA_fixed(png_ptr: png_structp; info_ptr: png_infop;
+             file_gamma: png_fixed_point);
+             stdcall;
 procedure png_set_gamma(png_ptr: png_structp; screen_gamma,
             default_file_gamma: double);
             stdcall;
@@ -525,10 +541,20 @@ procedure png_set_read_fn(png_ptr: png_structp;
 procedure png_set_read_status_fn(png_ptr: png_structp;
             read_row_fn: png_read_status_ptr);
             stdcall;
+procedure png_set_read_user_chunk_fn(png_ptr: png_structp;
+             read_user_chunk_fn: png_user_chunk_ptr);
+             stdcall;
 procedure png_set_read_user_transform_fn(png_ptr: png_structp;
             read_user_transform_fn: png_user_transform_ptr);
             stdcall;
-procedure png_set_rgb_to_gray(png_ptr: png_structp; int: error_action);
+procedure png_set_rgb_to_gray(png_ptr: png_structp; int: error_action;
+             red_weight, green_weight: double);
+             stdcall;
+procedure png_set_rgb_to_gray_fixed(png_ptr: png_structp; int: error_action;
+             red_weight, green_weight: png_fixed_point);
+             stdcall;
+procedure png_set_rows(png_ptr: png_structp; info_ptr: png_infop;
+             row_pointers: png_bytepp);
             stdcall;
 procedure png_set_sBIT(png_ptr: png_structp; info_ptr: png_infop;
             sig_bits: png_color_8p);
@@ -608,24 +634,18 @@ procedure png_get_iCCP(png_ptr: png_structp; info_ptr: png_infop;
             name: png_charpp; compression_type: int *; profile: png_charpp;
             proflen: png_int_32): png_bytep;
             stdcall;
-procedure png_get_spalettes(png_ptr: png_structp;
+procedure png_get_sPLT(png_ptr: png_structp;
             info_ptr: png_infop;  entries: png_spalette_pp): png_uint_32;
             stdcall;
-procedure png_free_pCAL(png_ptr: png_structp; info_ptr: png_infop);
-             stdcall;
 procedure png_set_iCCP(png_ptr: png_structp; info_ptr: png_infop;
             name: png_charp; compression_type: int; profile: png_charp;
             proflen: int);
             stdcall;
-procedure png_free_iCCP(png_ptr: png_structp; info_ptr: png_infop);
+procedure png_free_data(png_ptr: png_structp; info_ptr: png_infop; num: int);
             stdcall;
-procedure png_free_text(png_ptr: png_structp; info_ptr: png_infop);
-             stdcall;
-procedure png_set_spalettes(png_ptr: png_structp; info_ptr: png_infop;
+procedure png_set_sPLT(png_ptr: png_structp; info_ptr: png_infop;
             entries: png_spalette_p; nentries: int);
             stdcall;
-procedure png_free_sPLT(png_ptr: png_structp; info_ptr: png_infop);
-             stdcall;

 implementation

@@ -667,12 +687,14 @@ function png_get_pixel_aspect_ratio; external pngDLL;
 function png_get_pixels_per_meter; external pngDLL;
 function png_get_progressive_ptr; external pngDLL;
 function png_get_rowbytes; external pngDLL;
+function png_get_rows; external pngDLL;
 function png_get_sBIT; external pngDLL;
 function png_get_sRGB; external pngDLL;
 function png_get_signature; external pngDLL;
 function png_get_tIME; external pngDLL;
 function png_get_tRNS; external pngDLL;
 function png_get_text; external pngDLL;
+function png_get_user_chunk_ptr; external pngDLL;
 function png_get_valid; external pngDLL;
 function png_get_x_offset_microns; external pngDLL;
 function png_get_x_offset_pixels; external pngDLL;
@@ -694,6 +716,7 @@ procedure png_set_bKGD; external pngDLL;
 procedure png_set_background; external pngDLL;
 procedure png_set_bgr; external pngDLL;
 procedure png_set_cHRM; external pngDLL;
+procedure png_set_cHRM_fixed; external pngDLL;
 procedure png_set_compression_level; external pngDLL;
 procedure png_set_compression_mem_level; external pngDLL;
 procedure png_set_compression_method; external pngDLL;
@@ -708,6 +731,7 @@ procedure png_set_filter; external pngDLL;
 procedure png_set_filter_heuristics; external pngDLL;
 procedure png_set_flush; external pngDLL;
 procedure png_set_gAMA; external pngDLL;
+procedure png_set_gAMA_fixed; external pngDLL;
 procedure png_set_gamma; external pngDLL;
 procedure png_set_gray_to_rgb; external pngDLL;
 procedure png_set_hIST; external pngDLL;
@@ -723,6 +747,9 @@ procedure png_set_progressive_read_fn; external pngDLL;
 procedure png_set_read_fn; external pngDLL;
 procedure png_set_read_status_fn; external pngDLL;
 procedure png_set_read_user_transform_fn; external pngDLL;
+procedure png_set_rgb_to_gray; external pngDLL;
+procedure png_set_rgb_to_gray_fixed; external pngDLL;
+procedure png_set_rows; external pngDLL;
 procedure png_set_sBIT; external pngDLL;
 procedure png_set_sRGB; external pngDLL;
 procedure png_set_sRGB_gAMA_and_cHRM; external pngDLL;
@@ -735,6 +762,7 @@ procedure png_set_swap_alpha; external pngDLL;
 procedure png_set_tIME; external pngDLL;
 procedure png_set_tRNS; external pngDLL;
 procedure png_set_text; external pngDLL;
+procedure png_set_user_chunk_fn; external pngDLL;
 procedure png_set_write_fn; external pngDLL;
 procedure png_set_write_status_fn; external pngDLL;
 procedure png_set_write_user_transform_fn; external pngDLL;
@@ -752,12 +780,9 @@ procedure png_write_info_before_PLTE; external pngDLL;
 procedure png_write_row; external pngDLL;
 procedure png_write_rows; external pngDLL;
 procedure png_get_iCCP; external pngDLL;
-procedure png_get_spalettes; external pngDLL;
-procedure png_free_pCAL; external pngDLL;
+procedure png_get_sPLT; external pngDLL;
 procedure png_set_iCCP; external pngDLL;
-procedure png_free_iCCP; external pngDLL;
-procedure png_free_text; external pngDLL;
-procedure png_set_spalettes; external pngDLL;
-procedure png_free_sPLT; external pngDLL;
+procedure png_set_sPLT; external pngDLL;
+procedure png_free_data; external pngDLL;

 end.
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -31,6 +31,8 @@ EXPORTS
  png_set_bgr
  png_set_gray_to_rgb
  png_set_rgb_to_gray
+  png_set_rgb_to_gray_fixed
+  png_set_rows
  png_build_grayscale_palette
  png_set_strip_alpha
  png_set_swap_alpha
@@ -47,6 +49,7 @@ EXPORTS
  png_set_dither
  png_set_gamma
  png_set_flush
+  png_set_user_chunk_fn
  png_write_flush
  png_start_read_image
  png_read_update_info
@@ -79,6 +82,7 @@ EXPORTS
  png_get_header_ver
  png_get_header_version
  png_get_libpng_ver
+  png_get_user_chunk_ptr
 ; png_get_mem_fn
 ; png_set_mem_fn
  png_set_write_fn
@@ -118,6 +122,7 @@ EXPORTS
  png_get_pixels_per_meter
  png_get_pixel_aspect_ratio
  png_get_rgb_to_gray_status
+  png_get_rows
  png_get_x_offset_pixels
  png_get_y_offset_pixels
  png_get_x_offset_microns
@@ -127,8 +132,10 @@ EXPORTS
  png_set_bKGD
  png_get_cHRM
  png_set_cHRM
+  png_set_cHRM_fixed
  png_get_gAMA
  png_set_gAMA
+  png_set_gAMA_fixed
  png_get_hIST
  png_set_hIST
  png_get_IHDR
@@ -177,20 +184,24 @@ EXPORTS
  png_write_PLTE
  png_write_IDAT
  png_write_IEND
-  png_write_gAMA
-  png_write_sBIT
-  png_write_cHRM
-  png_write_sRGB
-  png_write_tRNS
  png_write_bKGD
+  png_write_cHRM
+  png_write_gAMA
  png_write_hIST
-  png_check_keyword
-  png_write_tEXt
-  png_write_zTXt
+  png_write_iCCP
+  png_write_iTXt
  png_write_oFFs
  png_write_pCAL
  png_write_pHYs
+  png_write_sBIT
+  png_write_sCAL
+  png_write_sPLT
+  png_write_sRGB
+  png_check_keyword
+  png_write_tEXt
  png_write_tIME
+  png_write_tRNS
+  png_write_zTXt
  png_write_finish_row
  png_write_start_row
  png_build_gamma_table
@@ -229,18 +240,22 @@ EXPORTS
  png_handle_IHDR
  png_handle_PLTE
  png_handle_IEND
-  png_handle_gAMA
-  png_handle_sBIT
-  png_handle_cHRM
-  png_handle_sRGB
-  png_handle_tRNS
  png_handle_bKGD
+  png_handle_cHRM
+  png_handle_gAMA
  png_handle_hIST
+  png_handle_iCCP
+  png_handle_iTXt
  png_handle_oFFs
  png_handle_pCAL
  png_handle_pHYs
-  png_handle_tIME
+  png_handle_sBIT
+  png_handle_sCAL
+  png_handle_sPLT
+  png_handle_sRGB
  png_handle_tEXt
+  png_handle_tIME
+  png_handle_tRNS
  png_handle_zTXt
  png_handle_unknown
  png_check_chunk_name
@@ -281,14 +296,10 @@ EXPORTS
 ; png_pass_height
  png_get_iCCP 
  png_get_sCAL
-  png_get_spalettes 
-  png_free_pCAL 
+  png_get_sPLT 
  png_set_iCCP 
-  png_free_iCCP 
-  png_free_text 
-  png_free_sCAL
-  png_set_spalettes 
-  png_free_sPLT 
+  png_set_sPLT 
+  png_free_data

  png_IHDR
  png_IDAT
Author	SHA1	Message	Date
Glenn Randers-Pehrson	326320e5a9	Imported from libpng-1.0.6h.tar	2009-04-06 16:05:01 -05:00
Glenn Randers-Pehrson	228bd390ac	Imported from libpng-1.0.6g.tar	2009-04-06 16:04:59 -05:00
Glenn Randers-Pehrson	4accabb590	Imported from libpng-1.0.6f.tar	2009-04-06 16:04:58 -05:00
Glenn Randers-Pehrson	38e6e77419	Imported from libpng-1.0.6e.tar	2009-04-06 16:04:56 -05:00
Glenn Randers-Pehrson	81fdf8aca1	Imported from libpng-1.0.6d.tar	2009-04-06 16:04:55 -05:00
Glenn Randers-Pehrson	68ea243ca3	Imported from libpng-1.0.6a.tar	2009-04-06 16:04:53 -05:00
Glenn Randers-Pehrson	520a764cd7	Imported from libpng-1.0.6.tar	2009-04-06 16:04:52 -05:00
Glenn Randers-Pehrson	a77ef625a6	Imported from libpng-1.0.5s.tar	2009-04-06 16:04:50 -05:00
Glenn Randers-Pehrson	61c32d9e66	Imported from libpng-1.0.5q.tar	2009-04-06 16:04:49 -05:00