Imported from libpng-1.0.3.tar

ANNOUNCE

@@ -1,18 +1,19 @@
 
-Libpng 1.0.2a - December 29, 1998
+Libpng 1.0.3 - January 14, 1999
 
-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.
+This is a public release of libpng, intended for use in production codes.
 
-Changes since the last public release:
+Changes since the previous public release (1.0.2):
 
-libpng-1.0.2a:
+libpng-1.0.3:
 
   Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
   Fixed a bug in png_do_filler() that made it fail to write filler bytes in
     the left-most pixel of each row (Kevin Bracey).
   Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
     in pngtest.c (Duncan Simpson).
+  Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
+    even when no tIME chunk was present in the source file.
   Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
   Fixed a problem in png_read_push_finish_row(), which would not skip some
     passes that it should skip, for images that are less than 3 pixels high.
@@ -31,8 +32,22 @@ libpng-1.0.2a:
   Removed lines after Dynamic Dependencies" in makefile.aco .
   Revised makefile.dec to make a shared library (Jeremie Petit).
   Removed trailing blanks from all files. 
+  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
+  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
+  Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
+  Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
+    which is obsolete.
+  Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
+  Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.
 
 Send comments/corrections/commendations to
 png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
 
 Glenn R-P
+
+Send comments/corrections/commendations to
+png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
+
+Glenn Randers-Pehrson
+libpng maintainer
+PNG Development Group

CHANGES

@@ -352,12 +352,14 @@ version 1.0.1e [June 6, 1998]
   Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
 version 1.0.2 [June 14, 1998]
   Fixed two bugs in makefile.bor .
-version 1.0.2a [December 29, 1998]
+version 1.0.2a [December 30, 1998]
   Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
   Fixed a bug in png_do_filler() that made it fail to write filler bytes in
     the left-most pixel of each row (Kevin Bracey).
   Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
     in pngtest.c (Duncan Simpson).
+  Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
+    even when no tIME chunk was present in the source file.
   Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
   Fixed a problem in png_read_push_finish_row(), which would not skip some
     passes that it should skip, for images that are less than 3 pixels high.
@@ -376,3 +378,12 @@ version 1.0.2a [December 29, 1998]
   Removed lines after Dynamic Dependencies" in makefile.aco .
   Revised makefile.dec to make a shared library (Jeremie Petit).
   Removed trailing blanks from all files. 
+version 1.0.2a [January 6, 1999]
+  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
+  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
+  Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
+  Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
+    which is obsolete.
+version 1.0.3 [January 14, 1999]
+  Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
+  Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.

INSTALL

@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.2a - December 29, 1998
+Installing libpng version 1.0.3 - January 14, 1999
 
 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-1.0.2a" or "lpng103" and "zlib-1.1.3"
+might be called "libpng-1.0.3" or "lpng103" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -42,6 +42,7 @@ include
       makefile.std  =>  Generic UNIX makefile
       makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
       makefile.dec  =>  DEC Alpha UNIX makefile
+      makefile.hux  =>  HPUX (10.20 and 11.00) makefile
       makefile.sgi  =>  Silicon Graphics IRIX makefile
       makefile.sun  =>  Sun makefile
       makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)

KNOWNBUG

@@ -1,5 +1,5 @@
 
-Known bugs and suggested enhancements in libpng-1.0.2
+Known bugs and suggested enhancements in libpng-1.0.3
 
 
 1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
@@ -14,33 +14,10 @@ Known bugs and suggested enhancements in libpng-1.0.2
    Question whether i-- or --i is better.
 
    STATUS: Under investigation, postponed until after
-   libpng-1.0.2.  About 160 loops will be turned around
+   libpng-1.0.3.  About 160 loops will be turned around
    in libpng-1.0.Nn, for testing.
 
-2. June 15, 1998 -- BUG -- Evan Light
-
-   Under some conditions, 16-bit grayscale images aren't properly
-   expanded to rgb, because png_read_start_row() returns too small a
-   value of max_pixel_depth when png_set_filler() has also been called.
-
-   STATUS: Fixed in libpng-1.0.2a
-
-3. June 16, 1998 -- BUG -- Matt McConnell
-
-   When reading interlaced images with a progressive reader, in some
-   cases (interlaced images less than 3 pixels high) some passes are
-   not skipped that should be.
-
-   STATUS: Fixed in libpng-1.0.2a
-
-4. July 3, 1998 -- ENHANCEMENT -- Glenn R-P
-
-   Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
-
-   STATUS: Done in libpng-1.0.2a, awaiting comment on resulting test
-   images.
-
-5. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
+2. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
 
    libpng-1.0.2 and earlier transform colors to gamma=1.0 space for
    merging with background, and then back to the image's gamma.  The
@@ -52,35 +29,4 @@ Known bugs and suggested enhancements in libpng-1.0.2
 
    STATUS: under development.
 
-6. August 20, 1998 -- BUG -- Kevin Bracey
-
-   When using the filler transformation, the filler isn't written
-   into the leftmost pixel of each row.
-
-   Also, the filler operation isn't being done right when writing
-   files.  Some code that was removed from png_set_filler() in
-   libpng 1.0.1a shouldn't have been removed.
-
-   STATUS: Fixed in libpng-1.0.2a
-
-7. August 23, 1998 -- BUG -- Duncan Simpson
-
-   "static pngcharp tIME_string" should be changed to
-   "static char tIME_string[30]" in pngtest.c
-
-   STATUS: Fixed in libpng-1.0.2a
-
-8. August 24, 1998 -- BUG -- John Cromer
-
-   Order of byte-swap and shift operations seems to be incorrect in
-   png_do_write_transformations()
-
-   STATUS: Under investigation.
-
-9. September 11, 1998 -- ENHANCEMENT -- L. Peter Deutsch
-
-   The PNG_NO_STDIO macro should be split into PNG_NO_STDIO
-   and PNG_NO_CONSOLE_STDIO.
-
-   STATUS: Done in libpng-1.0.2a
 

README

@@ -1,4 +1,4 @@
-README for libpng 1.0.2a - December 29, 1998 (shared library 2.1)
+README for libpng 1.0.3 - January 14, 1999 (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.
@@ -159,6 +159,7 @@ Files in this distribution:
         makefile.std  =>  Generic UNIX makefile
         makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
         makefile.dec  =>  DEC Alpha UNIX makefile
+        makefile.hux  =>  HPUX (10.20 and 11.00) makefile
         makefile.sgi  =>  Silicon Graphics IRIX makefile
         makefile.sun  =>  Sun makefile
         makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)

Y2KINFO

@@ -0,0 +1,52 @@
+   Y2K compliance in libpng:
+   =========================
+      
+      January 13, 1999
+      
+      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 0.81 and
+      upward are Y2K compliant.  It is my belief that earlier versions were
+      also Y2K compliant.
+      
+      Libpng only has three year fields.  One is a 2-byte unsigned integer
+      that will hold years up to 65535.  The other two hold the date in text
+      format, and will hold years up to 9999.
+      
+      The integer is
+          "png_uint_16 year" in png_time_struct.
+      
+      The strings are
+          "png_charp time_buffer" in png_struct and
+          "near_time_buffer", which is a local character string in png.c.
+      
+      There are seven time-related functions:
+
+          png_convert_to_rfc_1123() in png.c 
+            (formerly png_convert_to_rfc_1152() in error)
+          png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+          png_convert_from_time_t() in pngwrite.c
+          png_get_tIME() in pngget.c
+          png_handle_tIME() in pngrutil.c, called in pngread.c
+          png_set_tIME() in pngset.c
+          png_write_tIME() in pngwutil.c, called in pngwrite.c
+      
+      All appear to handle dates properly in a Y2K environment.  The 
+      png_convert_from_time_t() function calls gmtime() to convert from system
+      clock time, which returns (year - 1900), which we properly convert to
+      the full 4-digit year.  There is a possibility that applications using
+      libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+      function, or incorrectly passing only a 2-digit year instead of
+      "year - 1900" into the png_convert_from_struct_tm() function, but this
+      is not under our control.  The libpng documentation has always stated
+      that it works with 4-digit years, and the APIs have been documented as
+      such.
+      
+      The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+      integer to hold the year, and can hold years as large as 65535.
+      
+      
+         Glenn Randers-Pehrson
+         libpng maintainer
+         PNG Development Group

example.c

@@ -15,8 +15,11 @@
 
 #include "png.h"
 
-/* Check to see if a file is a PNG file using png_sig_cmp().  Returns
- * non-zero if the image is a PNG, and 0 if it isn't a PNG.
+/* 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.
+ *
+ * The function check_if_png() shown here, but not used, returns nonzero (true)
+ * if the file can be opened and is a PNG, 0 (false) otherwise.
  *
  * If this call is successful, and you are going to keep the file open,
  * you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
@@ -41,12 +44,14 @@ int check_if_png(char *file_name, FILE **fp)
    if ((*fp = fopen(file_name, "rb")) != NULL);
       return 0;
 
-   /* Read in the signature bytes */
+   /* Read in some of the signature bytes */
    if (fread(buf, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK)
       return 0;
 
-   /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature. */
-   return(png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
+   /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
+      Return nonzero (true) if they match */
+
+   return(!png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
 }
 
 /* Read a PNG file.  You may want to return an error code if the read

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "December 29, 1998"
+.TH LIBPNG 3 "January 14, 1999"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2a - December 29, 1998
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
 .SH SYNOPSIS
 
 #include <png.h>
@@ -423,10 +423,10 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.2a - December 29, 1998
+ libpng version 1.0.3 - January 14, 1999
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
- Copyright (c) 1998, Glenn Randers-Pehrson
+ Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  For conditions of distribution and use, see copyright
  notice in png.h.
 
@@ -552,7 +552,7 @@ Customizing libpng.
         return;
     }
     fread(header, 1, number, fp);
-    is_png = png_check_sig(header, 0, number);
+    is_png = !png_sig_cmp(header, 0, number);
     if (!is_png)
     {
         return;
@@ -2437,6 +2437,58 @@ png_set_error_fn(), which is essentially the same function, but with a
 new name to force compilation errors with applications that try to use
 the old method.
 
+.SH VII. Y2K Compliance in libpng
+
+January 13, 1999
+
+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 0.81 and
+upward are Y2K compliant.  It is my belief that earlier versions were
+also Y2K compliant.
+
+Libpng only has three year fields.  One is a 2-byte unsigned integer that
+will hold years up to 65535.  The other two hold the date in text
+format, and will hold years up to 9999.
+
+The integer is
+    "png_uint_16 year" in png_time_struct.
+
+The strings are
+    "png_charp time_buffer" in png_struct and
+    "near_time_buffer", which is a local character string in png.c.
+
+There are seven time-related functions:
+
+    png_convert_to_rfc_1123() in png.c 
+      (formerly png_convert_to_rfc_1152() in error)
+    png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+    png_convert_from_time_t() in pngwrite.c
+    png_get_tIME() in pngget.c
+    png_handle_tIME() in pngrutil.c, called in pngread.c
+    png_set_tIME() in pngset.c
+    png_write_tIME() in pngwutil.c, called in pngwrite.c
+
+All appear to handle dates properly in a Y2K environment.  The 
+png_convert_from_time_t() function calls gmtime() to convert from system
+clock time, which returns (year - 1900), which we properly convert to
+the full 4-digit year.  There is a possibility that applications using
+libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+function, or incorrectly passing only a 2-digit year instead of
+"year - 1900" into the png_convert_from_struct_tm() function, but this
+is not under our control.  The libpng documentation has always stated
+that it works with 4-digit years, and the APIs have been documented as
+such.
+
+The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+integer to hold the year, and can hold years as large as 65535.
+
+
+   Glenn Randers-Pehrson
+   libpng maintainer
+   PNG Development Group
+
 .SH NOTE
 
 Note about libpng version numbers:
@@ -2522,7 +2574,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
   
-Libpng version 1.0.2a - December 29, 1998:
+Libpng version 1.0.3 - January 14, 1999:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
 
@@ -2532,6 +2584,10 @@ Supported by the PNG development group
 
 .SH COPYRIGHT NOTICE:
 
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+Copyright (c) 1996, 1997 Andreas Dilger
+Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+
 The PNG Reference Library (libpng) is supplied "AS IS".  The Contributing
 Authors and Group 42, Inc. disclaim all warranties, expressed or implied,
 including, without limitation, the warranties of merchantability and of

libpng.txt

@@ -1,9 +1,9 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.2a - December 29, 1998
+ libpng version 1.0.3 - January 14, 1999
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
- Copyright (c) 1998, Glenn Randers-Pehrson
+ Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  For conditions of distribution and use, see copyright
  notice in png.h.
 
@@ -129,7 +129,7 @@ Customizing libpng.
         return;
     }
     fread(header, 1, number, fp);
-    is_png = png_check_sig(header, 0, number);
+    is_png = !png_sig_cmp(header, 0, number);
     if (!is_png)
     {
         return;
@@ -2013,3 +2013,55 @@ to set the error callbacks AFTER png_read_init(), or to change them with
 png_set_error_fn(), which is essentially the same function, but with a
 new name to force compilation errors with applications that try to use
 the old method.
+
+VII. Y2K Compliance in libpng
+
+January 13, 1999
+
+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 0.81 and
+upward are Y2K compliant.  It is my belief that earlier versions were
+also Y2K compliant.
+
+Libpng only has three year fields.  One is a 2-byte unsigned integer that
+will hold years up to 65535.  The other two hold the date in text
+format, and will hold years up to 9999.
+
+The integer is
+    "png_uint_16 year" in png_time_struct.
+
+The strings are
+    "png_charp time_buffer" in png_struct and
+    "near_time_buffer", which is a local character string in png.c.
+
+There are seven time-related functions:
+
+    png_convert_to_rfc_1123() in png.c 
+      (formerly png_convert_to_rfc_1152() in error)
+    png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+    png_convert_from_time_t() in pngwrite.c
+    png_get_tIME() in pngget.c
+    png_handle_tIME() in pngrutil.c, called in pngread.c
+    png_set_tIME() in pngset.c
+    png_write_tIME() in pngwutil.c, called in pngwrite.c
+
+All appear to handle dates properly in a Y2K environment.  The 
+png_convert_from_time_t() function calls gmtime() to convert from system
+clock time, which returns (year - 1900), which we properly convert to
+the full 4-digit year.  There is a possibility that applications using
+libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+function, or incorrectly passing only a 2-digit year instead of
+"year - 1900" into the png_convert_from_struct_tm() function, but this
+is not under our control.  The libpng documentation has always stated
+that it works with 4-digit years, and the APIs have been documented as
+such.
+
+The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+integer to hold the year, and can hold years as large as 65535.
+
+
+   Glenn Randers-Pehrson
+   libpng maintainer
+   PNG Development Group

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "December 29, 1998"
+.TH LIBPNGPF 3 "January 14, 1999"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2a - December 29, 1998
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
 (private functions)
 .SH SYNOPSIS
 #include <png.h>

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "December 29, 1998"
+.TH PNG 5 "January 14, 1999"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -1,10 +1,10 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.2a - December 29, 1998
+ * libpng version 1.0.3 - January 14, 1999
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  * 
  */
 
@@ -16,7 +16,7 @@
  * string defined in png.h.
  */
 
-char png_libpng_ver[12] = "1.0.2a";
+char png_libpng_ver[12] = "1.0.3";
 
 /* Place to hold the signature string for a PNG file. */
 png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -115,8 +115,8 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
 }
 
 /* (Obsolete) function to check signature bytes.  It does not allow one
- * to check a partial signature.  This function will be removed in the
- * future - use png_sig_cmp().
+ * to check a partial signature.  This function might be removed in the
+ * future - use png_sig_cmp().  Returns true (nonzero) if the file is a PNG.
  */
 int
 png_check_sig(png_bytep sig, int num)
@@ -350,9 +350,10 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 png_charp
 png_get_copyright(png_structp png_ptr)
 {
-   return("\n libpng version 1.0.2a - December 29, 1998\n\
+   if(png_ptr == NULL)
+     /* silence compiler warning about unused png_ptr */ ;
+   return("\n libpng version 1.0.3 - January 14, 1999\n\
    Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
-   Copyright (c) 1998, Glenn Randers-Pehrson\n");
+   Copyright (c) 1998, 1999, Glenn Randers-Pehrson\n");
 }
-

png.h

@@ -1,13 +1,65 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.0.2a - December 29, 1998
+ * libpng version 1.0.3 - January 14, 1999
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
+ * Y2K compliance in libpng:
+ * =========================
+ *    
+ *    January 13, 1999
+ *    
+ *    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 0.81 and
+ *    upward 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.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
+ *        png_get_tIME() in pngget.c
+ *        png_handle_tIME() in pngrutil.c, called in pngread.c
+ *        png_set_tIME() in pngset.c
+ *        png_write_tIME() in pngwutil.c, called in pngwrite.c
+ *    
+ *    All handle dates properly in a Y2K environment.  The 
+ *    png_convert_from_time_t() function calls gmtime() to convert from system
+ *    clock time, which returns (year - 1900), which we properly convert to
+ *    the full 4-digit year.  There is a possibility that applications using
+ *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+ *    function, or incorrectly passing only a 2-digit year instead of
+ *    "year - 1900" into the png_convert_from_struct_tm() function, but this
+ *    is not under our control.  The libpng documentation has always stated
+ *    that it works with 4-digit years, and the APIs have been documented as
+ *    such.
+ *    
+ *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
+ *    integer to hold the year, and can hold years as large as 65535.
+ *    
+ *    
+ *       Glenn Randers-Pehrson
+ *       libpng maintainer
+ *       PNG Development Group
+ * 
  * Note about libpng version numbers:
- *
+ * 
  *    Due to various miscommunications, unforeseen code incompatibilities
  *    and occasional factors outside the authors' control, version numbering
  *    on the library has not always been consistent and straightforward.
@@ -31,7 +83,7 @@
  *    1.0.1                     1.0.1    10001  2.1.0
  *    1.0.1a-e                  1.0.1a-e 10002  2.1.0.1a-e
  *    1.0.2                     1.0.2    10002  2.1.0.2
- *    1.0.2a                    1.0.2a   10003  2.1.0.2a
+ *    1.0.2a-c                  1.0.2a   10003  2.1.0.2a-c
  *    1.0.3                     1.0.3    10003  2.1.0.3
  *
  *    Henceforth the source version will match the shared-library minor
@@ -93,6 +145,7 @@
  * appreciated.
  */
 
+
 #ifndef _PNG_H
 #define _PNG_H
 
@@ -119,7 +172,7 @@ extern "C" {
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.2a"
+#define PNG_LIBPNG_VER_STRING "1.0.3"
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -1490,12 +1543,16 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
 #endif
 
 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
-#ifdef PNG_NO_EXTERN
 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
+
+#ifdef PNG_NO_EXTERN
+/* this only gets included in png.c */
 png_charp
 png_get_header_version(png_structp png_ptr)
 {
-   return("\n libpng version 1.0.2a - December 29, 1998 (header)\n");
+   if(png_ptr == NULL)
+     /* silence compiler warning about unused png_ptr */ ;
+   return("\n libpng version 1.0.3 - January 14, 1999 (header)\n");
 }
 #endif
 
@@ -2160,16 +2217,11 @@ PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
 
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
-#endif
- 
-
 #endif /* PNG_INTERNAL */
 
 #ifdef __cplusplus
 }
 #endif
 
-#ifdef PNG_NO_EXTERN
-
 /* do not put anything past this line */
 #endif /* _PNG_H */

pngconf.h

@@ -1,11 +1,11 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 /* Any machine specific code is near the front of this file, so if you

pngerror.c

@@ -1,11 +1,11 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
  * This file provides a location for all error handling.  Users who
  * need special error handling are expected to write replacement functions
@@ -136,12 +136,11 @@ png_default_error(png_structp png_ptr, png_const_charp message)
 static void
 png_default_warning(png_structp png_ptr, png_const_charp message)
 {
-   if (png_ptr == NULL)
-      return;
-
 #ifndef PNG_NO_CONSOLE_IO
    fprintf(stderr, "libpng warning: %s\n", message);
 #endif
+   if (png_ptr == NULL)
+      return;
 }
 
 /* This function is called when the application wants to use another method

pngget.c

@@ -1,11 +1,11 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 #define PNG_INTERNAL

pngmem.c

@@ -1,11 +1,11 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to supply replacement

pngpread.c

@@ -1,11 +1,11 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 #define PNG_INTERNAL

pngread.c

@@ -1,11 +1,11 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -530,7 +530,7 @@ 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 1.0.2a.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
  */
 
 void
@@ -579,7 +579,7 @@ 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 1.0.2a.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
  */
 void
 png_read_image(png_structp png_ptr, png_bytepp image)

pngrio.c

@@ -1,11 +1,11 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 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

pngrtran.c

@@ -1,11 +1,11 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 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.

pngrutil.c

@@ -1,11 +1,11 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
  * This file contains routines that are only called from within
  * libpng itself during the course of reading an image.

pngset.c

@@ -1,11 +1,11 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 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

pngtest.c

@@ -1,11 +1,11 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.0.2a -December 29, 1998
+ * libpng 1.0.3 -January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 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
@@ -735,16 +735,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))
       {
          png_set_tIME(write_ptr, write_info_ptr, mod_time);
-      }
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
-      {
          /* we have to use png_strcpy instead of "=" because the string
             pointed to by png_convert_to_rfc1123() gets free'ed before
             we use it */
          png_strcpy(tIME_string,png_convert_to_rfc1123(read_ptr, mod_time));
          tIME_chunk_present++;
-      }
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
+      }
    }
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED) && defined(PNG_WRITE_tRNS_SUPPORTED)

pngtrans.c

@@ -1,11 +1,11 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 #define PNG_INTERNAL

pngwio.c

@@ -1,11 +1,11 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 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

pngwrite.c

@@ -1,11 +1,11 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 /* get internal access to png.h */

pngwtran.c

@@ -1,11 +1,11 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 #define PNG_INTERNAL

pngwutil.c

@@ -1,11 +1,11 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 1.0.2a - December 29, 1998
+ * libpng 1.0.3 - January 14, 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, Glenn Randers-Pehrson
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  */
 
 #define PNG_INTERNAL

scripts/makefile.dec

@@ -14,7 +14,7 @@ ZLIBINC=../zlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.2a
+PNGMIN = 1.0.3
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 CC=cc

scripts/makefile.hux

@@ -0,0 +1,68 @@
+===========================================================================
+# makefile for libpng, HPUX (10.20 and 11.00)
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42
+# Copyright (C) 1999 Glenn Randers-Pehrson
+# contributed by Jim Rice, Hewlett Packard
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Where the zlib library and include files are located
+ZLIBLIB=/opt/zlib/lib
+ZLIBINC=/opt/zlib/include
+
+CC=cc
+CFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
+CCFLAGS=-I$(ZLIBINC) -O -Ae +DA1.1 +DS2.0
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
+
+RANLIB=ranlib
+
+# where make install puts libpng.a and png.h
+prefix=/opt/libpng/
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+        pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+        pngwtran.o pngmem.o pngerror.o pngpread.o
+
+all: libpng.a pngtest
+
+libpng.a: $(OBJS)
+        ar rc $@  $(OBJS)
+        $(RANLIB) $@
+
+pngtest: pngtest.o libpng.a
+        $(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+        ./pngtest
+
+install: libpng.a
+        -@mkdir $(prefix)/include
+        -@mkdir $(prefix)/lib
+        cp png.h $(prefix)/include
+        cp pngconf.h $(prefix)/include
+        chmod 644 $(prefix)/include/png.h
+        chmod 644 $(prefix)/include/pngconf.h
+        cp libpng.a $(prefix)/lib
+        chmod 644 $(prefix)/lib/libpng.a
+
+clean:
+        rm -f *.o libpng.a pngtest pngout.png
+
+# 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

scripts/makefile.lnx

@@ -32,7 +32,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.2a
+PNGMIN = 1.0.3
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/makefile.s2x

@@ -31,7 +31,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.2a
+PNGMIN = 1.0.3
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/makefile.sco

@@ -25,7 +25,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.2a
+PNGMIN = 1.0.3
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include

scripts/pngdef.pas

@@ -3,7 +3,7 @@ unit pngdef;
 interface
 
 const
-  PNG_LIBPNG_VER_STRING = '1.0.2a';
+  PNG_LIBPNG_VER_STRING = '1.0.3';
   PNG_LIBPNG_VER        =  10001;
 
 type