Imported from pngcrush-1.5.3.tar

README.txt

@@ -40,13 +40,12 @@ case of any discrepancy, the copy in pngcrush.c shall prevail):
 
 This is the output of "pngcrush" and "pngcrush -help":
 
-
+ | pngcrush 1.5.3, Copyright (C) 1998, 1999, 2000 Glenn Randers-Pehrson
- | pngcrush 1.5.2, Copyright (C) 1998, 1999, 2000 Glenn Randers-Pehrson
  | This is a free, open-source program.  Permission is
  | irrevocably granted to everyone to use this version
  | of pngcrush without payment of any fee.
- | This program was built with libpng version 1.0.9beta2,
+ | This program was built with libpng version 1.0.9beta5,
- | and is running with  libpng version 1.0.9beta2 - November 19, 2000 (header)
+ | and is running with  libpng version 1.0.9beta5 - December 14, 2000 (header)
  |    Copyright (C) 1998, 1999, 2000 Glenn Randers-Pehrson,
  |    Copyright (C) 1996, 1997 Andreas Dilger,
  |    Copyright (C) 1995, Guy Eric Schalnat, Group 42 Inc.,
@@ -83,6 +82,7 @@ options:
 -replace_gamma gamma (float or fixed*100000) even if gAMA is present.
           -res dpi
          -srgb [0, 1, 2, or 3]
+         -loco ("loco crush" truecolor PNGs)
          -text b[efore_IDAT]|a[fter_IDAT] "keyword" "text"
          -trns index red green blue gray
             -v (display more detailed information)
@@ -229,6 +229,15 @@ options (Note: any option can be spelled out for clarity, e.g.,
 
                Value of 'rendering intent' for sRGB chunk.
 
+         -loco ("loco crush" truecolor PNGs)
+
+               Make the file more compressible by performing a
+               lossless reversible color transformation.
+               The resulting file is a MNG, not a PNG, and should
+               be given the ".mng" file extension.  The
+               "loco" option has no effect on grayscale or
+               indexed-color PNG files.
+
          -text b[efore_IDAT]|a[fter_IDAT] "keyword" "text"
 
                tEXt chunk to insert.  keyword < 80 chars,
@@ -285,3 +294,31 @@ options (Note: any option can be spelled out for clarity, e.g.,
                screen scrolls out of sight.
 
 
+Copyright (C) 1998, 1999, 2000 Glenn Randers-Pehrson (randeg@alum.rpi.edu)
+
+
+DISCLAIMER: The pngcrush computer program is supplied "AS IS".
+The Author disclaims all warranties, expressed or implied, including,
+without limitation, the warranties of merchantability and of fitness
+for  any purpose.  The Author assumes no liability for direct, indirect,
+incidental, special, exemplary, or consequential damages, which may
+result from the use of the computer program, even if advised of the
+possibility of such damage.  There is no warranty against interference
+with your enjoyment of the computer program or against infringement.
+There is no warranty that my efforts or the computer program will
+fulfill any of your particular purposes or needs.  This computer
+program is provided with all faults, and the entire risk of satisfactory
+quality, performance, accuracy, and effort is with the user.
+
+LICENSE: Permission is hereby irrevocably granted to everyone to use,
+copy, modify, and distribute this computer program, or portions hereof,
+purpose, without payment of any fee, subject to the following
+restrictions:
+
+1. The origin of this binary or source code must not be misrepresented.
+
+2. Altered versions must be plainly marked as such and must not be
+misrepresented as being the original binary or source.
+
+3. The Copyright notice, disclaimer, and license may not be removed
+or altered from any source, binary, or altered source distribution.

deflate.c

@@ -232,9 +232,10 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
     }
     if (strm->zfree == Z_NULL) strm->zfree = zcfree;
 
-    if (level == Z_DEFAULT_COMPRESSION) level = 6;
 #ifdef FASTEST
     level = 1;
+#else
+    if (level == Z_DEFAULT_COMPRESSION) level = 6;
 #endif
 
     if (windowBits < 0) { /* undocumented feature: suppress zlib header */

png.c

@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.9beta2 - November 19, 2000
+ * libpng version 1.0.9beta5 - December 14, 2000
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -13,14 +13,14 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_9beta2 Your_png_h_is_not_version_1_0_9beta2;
+typedef version_1_0_9beta5 Your_png_h_is_not_version_1_0_9beta5;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
 
 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = "1.0.9beta2";
+const char png_libpng_ver[18] = "1.0.9beta5";
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -626,7 +626,7 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ((png_charp) "\n libpng version 1.0.9beta2 - November 19, 2000\n\
+   return ((png_charp) "\n libpng version 1.0.9beta5 - December 14, 2000\n\
    Copyright (c) 1998-2000 Glenn Randers-Pehrson\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
    Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
@@ -644,8 +644,8 @@ png_get_libpng_ver(png_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
    if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return((png_charp) "1.0.9beta2");
+      return((png_charp) "1.0.9beta5");
-   return((png_charp) "1.0.9beta2");
+   return((png_charp) "1.0.9beta5");
 }
 
 png_charp PNGAPI

png.h

@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.0.9beta2 - November 19, 2000
+ * libpng version 1.0.9beta5 - December 14, 2000
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -9,7 +9,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.0.9beta2 - November 19, 2000: Glenn
+ *  libpng versions 0.97, January 1998, through 1.0.9beta5 - December 14, 2000: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -58,7 +58,7 @@
  *    1.0.8beta1-4                  10008  2.1.0.8beta1-4
  *    1.0.8rc1                      10008  2.1.0.8rc1
  *    1.0.8                         10008  2.1.0.8
- *    1.0.9beta1-2                  10009  2.1.0.9
+ *    1.0.9beta1-5                  10009  2.1.0.9beta1-5
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -85,7 +85,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta2, November 19, 2000, are
+ * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta5, December 14, 2000, are
  * Copyright (c) 2000 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.0.6
  * with the following individuals added to the list of Contributing Authors
@@ -190,13 +190,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    November 19, 2000
+ *    December 14, 2000
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.0.9beta2 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.9beta5 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -252,7 +252,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.9beta2"
+#define PNG_LIBPNG_VER_STRING "1.0.9beta5"
 
 #define PNG_LIBPNG_VER_SONUM   2
 
@@ -262,8 +262,16 @@
 #define PNG_LIBPNG_VER_RELEASE 9
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
-#define PNG_LIBPNG_VER_BUILD  2
+
-#define PNG_LIBPNG_BUILD_TYPE beta /* alpha, beta, rc, stable, patched */
+#define PNG_LIBPNG_VER_BUILD  5
+
+#define PNG_LIBPNG_BUILD_ALPHA    1
+#define PNG_LIBPNG_BUILD_BETA     2
+#define PNG_LIBPNG_BUILD_RC       3
+#define PNG_LIBPNG_BUILD_STABLE   4
+#define PNG_LIBPNG_BUILD_TYPEMASK 7
+#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with STABLE only */
+#define PNG_LIBPNG_BUILD_TYPE 2
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -695,6 +703,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    /* iCCP chunk data. */
    png_charp iccp_name;     /* profile name */
    png_charp iccp_profile;  /* International Color Consortium profile data */
+                            /* Note to maintainer: should be png_bytep */
    png_uint_32 iccp_proflen;  /* ICC profile data length */
    png_byte iccp_compression; /* Always zero */
 #endif
@@ -775,6 +784,7 @@ typedef png_info FAR * FAR * png_infopp;
 
 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
 #define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
+#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
 #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
 
 /* These are for the interlacing type.  These values should NOT be changed. */
@@ -910,7 +920,9 @@ typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
 
 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
-#define PNG_ALL_MNG_FEATURES    0x01
+#define PNG_MODE_EMBEDDED_IN_MNG    0x02
+#define PNG_FLAG_MNG_FILTER_64      0x04
+#define PNG_ALL_MNG_FEATURES        0x07
 
 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
@@ -1156,12 +1168,14 @@ struct png_struct_def
    png_fixed_point int_gamma;
 #endif
 
+   png_byte filter_type;
+
 };
 
 /* This prevents a compiler error in png_get_copyright() in png.c if png.c
-and png.h are both at * version 1.0.9beta2
+and png.h are both at * version 1.0.9beta5
  */
-typedef png_structp version_1_0_9beta2;
+typedef png_structp version_1_0_9beta5;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -2013,12 +2027,14 @@ extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_charpp name, int *compression_type,
    png_charpp profile, png_uint_32 *proflen));
+   /* Note to maintainer: profile should be png_bytepp */
 #endif
 
 #if defined(PNG_iCCP_SUPPORTED)
 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_charp name, int compression_type,
    png_charp profile, png_uint_32 proflen));
+   /* Note to maintainer: profile should be png_bytep */
 #endif
 
 #if defined(PNG_READ_sPLT_SUPPORTED)
@@ -2200,7 +2216,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #endif
 
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.0.9beta2 - November 19, 2000 (header)\n"
+   " libpng version 1.0.9beta5 - December 14, 2000 (header)\n"
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2584,6 +2600,7 @@ PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
    png_charp name, int compression_type,
    png_charp profile, int proflen));
+   /* Note to maintainer: profile should be png_bytep */
 #endif
 
 #if defined(PNG_WRITE_sPLT_SUPPORTED)
@@ -2986,6 +3003,13 @@ PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
 
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row));
+PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
+   png_bytep row));
+#endif
+
 #endif /* PNG_INTERNAL */
 
 #ifdef __cplusplus

pngasmrd.h

@@ -1,6 +1,6 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
  *

pngconf.h

@@ -1,6 +1,6 @@
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngcrush.c

@@ -23,7 +23,7 @@
  *
  */
 
-#define PNGCRUSH_VERSION "1.5.2"
+#define PNGCRUSH_VERSION "1.5.3"
 
 /*
 */
@@ -64,6 +64,13 @@
  */
 
 /* Change log:
+ *
+ * Version 1.5.3 (built with libpng-1.0.9beta5)
+ *
+ *   Added "-loco" option (writes MNG files with filter_method 64)
+ *
+ *   "-dir" and "-ext" options are no longer mutually exclusive, e.g.:
+ *   pngcrush -loco -dir Crushed -ext .mng *.png
  *
  * Version 1.5.2 (built with libpng-1.0.9beta1)
  *
@@ -77,6 +84,11 @@
  *
  *   Added missing "png_ptr" argument to png_error() call
  *
+ *   Added "-loco" option, to enable the LOCO color transformation
+ *   (R->R-G, G, B->B-G) while writing a MNG with filter_method 64. Undo
+ *   the transformation and write the regular PNG filter_method (0) if the
+ *   MNG filter_method 64 is detected.
+ *
  *   Revised the "-help" output slightly and improved the "-version" output.
  *
  *   The "-already[_crushed]" option is now ignored if the "-force" option
@@ -298,6 +310,11 @@
  */
 
 /* To do:
+ *
+ *   Add a "pcRu" ancillary chunk that keeps track of the best method,
+ *   methods already tried, and whether "loco crushing" was effective.
+ *
+ *   Try both transformed and untransformed colors when "-loco" is used.
  *
  *   Check for unused alpha channel and ok-to-reduce-depth.
  *   Take care that sBIT and bKGD data aren't lost when reducing images
@@ -362,6 +379,10 @@ main()
 
 #else
 
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+# define PNGCRUSH_LOCO
+#endif
+
 #if defined(__DJGPP__)
 #  if ((__DJGPP__ == 2) && (__DJGPP_MINOR__ == 0))
 #    include <libc/dosio.h>      /* for _USE_LFN, djgpp 2.0 only */
@@ -396,6 +417,7 @@ main()
 #define DEFAULT_MODE   0
 #define DIRECTORY_MODE 1
 #define EXTENSION_MODE 2
+#define DIREX_MODE 3
 #define FOPEN(file, how) fopen(file, how)
 #define FCLOSE(file) {fclose(file); file=NULL;--number_of_open_files;};
 #define P1 if(verbose > 1)printf
@@ -499,9 +521,6 @@ char text_keyword[800];
 char text_lang[800];
 char text_lang_key[800];
 #endif
-#if (PNG_LIBPNG_VER < 10009)
-#undef PNG_iCCP_SUPPORTED
-#endif
 #ifdef PNG_iCCP_SUPPORTED
 int iccp_length = 0;
 char *iccp_text;
@@ -606,6 +625,11 @@ static png_infop end_info_ptr;
 static png_infop write_end_info_ptr;
 static FILE *fpin, *fpout;
 png_uint_32 measure_idats(FILE *fpin);
+#ifdef PNGCRUSH_LOCO
+static int do_loco=0;
+#endif
+static int input_format=0;  /* 0: PNG  1: MNG */
+static int output_format=0;
 static int do_color_count;
 static int reduction_ok=0;
 #ifdef PNGCRUSH_COUNT_COLORS
@@ -621,11 +645,7 @@ static int filter_type, zlib_level;
 static png_bytep png_row_filters=NULL;
 static TIME_T t_start, t_stop, t_decode, t_encode, t_misc;
 
-#if (PNG_LIBPNG_VER >= 10000)
-static png_uint_32 max_idat_size = 524288;
-#else
 static png_uint_32 max_idat_size = PNG_ZBUF_SIZE;
-#endif
 static png_uint_32 crushed_idat_size = 0x3ffffffL;
 static int already_crushed = 0;
 int ia;
@@ -1152,6 +1172,9 @@ main(int argc, char *argv[])
    else if(!strncmp(argv[i],"-d",2))
       {
          BUMP_I;
+         if(pngcrush_mode==EXTENSION_MODE)
+            pngcrush_mode=DIREX_MODE;
+         else
             pngcrush_mode=DIRECTORY_MODE;
          directory_name= argv[names++];
       }
@@ -1160,6 +1183,9 @@ main(int argc, char *argv[])
    else if(!strncmp(argv[i],"-e",2))
       {
          BUMP_I;
+         if(pngcrush_mode==DIRECTORY_MODE)
+            pngcrush_mode=DIREX_MODE;
+         else
             pngcrush_mode=EXTENSION_MODE;
          extension= argv[names++];
       }
@@ -1204,6 +1230,10 @@ main(int argc, char *argv[])
             brute_force_filter++;
          }
       }
+#ifdef PNGCRUSH_LOCO
+   else if(!strncmp(argv[i],"-loco",5))
+        do_loco=1;
+#endif
    else if(!strncmp(argv[i],"-l",2))
       {
          int lev, strat, filt;
@@ -1281,9 +1311,9 @@ main(int argc, char *argv[])
          help++;
          verbose++;
       }
+#ifdef PNG_iCCP_SUPPORTED
    else if(!strncmp(argv[i],"-iccp",5))
       {
-#ifdef PNG_iCCP_SUPPORTED
          FILE *iccp_fn;
          if(iccp_length)
             free(iccp_text);
@@ -1299,8 +1329,7 @@ main(int argc, char *argv[])
          else
          {
             int ic;
-            iccp_text=malloc(iccp_length+1);
+            iccp_text=malloc(iccp_length);
-            iccp_text[iccp_length]=(char)0x00;
             for (ic=0; ic<iccp_length; ic++)
             {
                   png_size_t num_in;
@@ -1310,17 +1339,16 @@ main(int argc, char *argv[])
                   iccp_text[ic]=buffer[0];
             }
          }
-#else
-         names+=3;
-         i+=3;
-         fprintf(STDERR, "libpng-1.0.9 or later is required to support iCCP.\n");
-#endif
       }
+#endif
    else if(!strncmp(argv[i],"-max",4))
       {
          names++;
          BUMP_I;
          max_idat_size = (png_uint_32)atoi(argv[i]);
+#if 0
+         if (max_idat_size > PNG_ZBUF_SIZE) max_idat_size=PNG_ZBUF_SIZE;
+#endif
       }
    else if(!strncmp(argv[i],"-m",2))
       {
@@ -1987,6 +2015,25 @@ main(int argc, char *argv[])
      if(verbose > 1)
      fprintf(STDERR,
        "\n               Value of 'rendering intent' for sRGB chunk.\n\n");
+#ifdef PNGCRUSH_LOCO
+     fprintf(STDERR,
+       "         -loco (\"loco crush\" truecolor PNGs)\n");
+     if(verbose > 1)
+     {
+     fprintf(STDERR,
+       "\n               Make the file more compressible by performing a\n");
+     fprintf(STDERR,
+       "               lossless reversible color transformation.\n");
+     fprintf(STDERR,
+       "               The resulting file is a MNG, not a PNG, and should\n");
+     fprintf(STDERR,
+       "               be given the \".mng\" file extension.  The\n");
+     fprintf(STDERR,
+       "               \"loco\" option has no effect on grayscale or\n");
+     fprintf(STDERR,
+       "               indexed-color PNG files.\n\n");
+     }
+#endif
      fprintf(STDERR,
        "         -text b[efore_IDAT]|a[fter_IDAT] \"keyword\" \"text\"\n");
      if(verbose > 1)
@@ -2159,38 +2206,7 @@ main(int argc, char *argv[])
          exit(0);
       }
 
-      if(pngcrush_mode == EXTENSION_MODE)
+      if(pngcrush_mode == DIRECTORY_MODE || pngcrush_mode == DIREX_MODE)
-      {
-          ip=in_string;
-          in_string[0]='\0';
-          str_return = strcat(in_string,inname);
-          ip = in_string;
-          op = dot = out_string;
-          while(*ip != '\0')
-          {
-             *op++ = *ip++;
-#ifdef __riscos
-             if(*ip == '/')dot=op;
-#else
-             if(*ip == '.')dot=op;
-#endif
-          }
-          *op = '\0';
-
-          if(dot != out_string)
-             *dot = '\0';
-
-          in_extension[0]='\0';
-          if(dot != out_string)
-          {
-             str_return = strcat(in_extension,++dot);
-          }
-
-          str_return = strcat(out_string,extension);
-          outname=out_string;
-      }
-
-      if(pngcrush_mode == DIRECTORY_MODE)
       {
 #ifdef __riscos
           if(fileexists(directory_name) & 2)
@@ -2231,6 +2247,40 @@ main(int argc, char *argv[])
           outname=out_string;
       }
 
+      if(pngcrush_mode == EXTENSION_MODE || pngcrush_mode == DIREX_MODE)
+      {
+          ip=in_string;
+          in_string[0]='\0';
+          if(pngcrush_mode == EXTENSION_MODE)
+             str_return = strcat(in_string,inname);
+          else
+             str_return = strcat(in_string,outname);
+          ip = in_string;
+          op = dot = out_string;
+          while(*ip != '\0')
+          {
+             *op++ = *ip++;
+#ifdef __riscos
+             if(*ip == '/')dot=op;
+#else
+             if(*ip == '.')dot=op;
+#endif
+          }
+          *op = '\0';
+
+          if(dot != out_string)
+             *dot = '\0';
+
+          in_extension[0]='\0';
+          if(dot != out_string)
+          {
+             str_return = strcat(in_extension,++dot);
+          }
+
+          str_return = strcat(out_string,extension);
+          outname=out_string;
+      }
+
 
       if(nosave < 2)
       {
@@ -2478,7 +2528,7 @@ main(int argc, char *argv[])
          struct stat stat_in, stat_out;
          if ((stat(inname, &stat_in) == 0) &&
              (stat(outname, &stat_out) == 0) &&
-#ifdef _MSC_VER /* maybe others? */
+#if defined(_MSC_VER) || defined(__MINGW32__) /* maybe others? */
             /* MSVC++6.0 will erroneously return 0 for both files, so we
                simply check the size instead.  It is possible that we will
                erroneously reject the attempt when inputsize and outputsize
@@ -2729,11 +2779,25 @@ main(int argc, char *argv[])
 
       png_debug(0, "Reading info struct\n");
    {
+#if defined(PNGCRUSH_LOCO)
+      png_byte mng_signature[8] = {138, 77, 78, 71, 13, 10, 26, 10};
+#endif
       png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
 
       png_read_data(read_ptr, png_signature, 8);
       png_set_sig_bytes(read_ptr, 8);
 
+#if defined(PNGCRUSH_LOCO)
+      if (!(int)(png_memcmp(mng_signature, png_signature, 8)))
+      {
+         png_byte buffer[40];
+         /* Skip the MHDR */
+         png_permit_mng_features (read_ptr, PNG_FLAG_MNG_FILTER_64);
+         png_read_data(read_ptr, buffer, 40);
+         input_format=1;
+      }
+      else 
+#endif
       if (png_sig_cmp(png_signature, 0, 8))
       {
          if (png_sig_cmp(png_signature, 0, 4))
@@ -2906,6 +2970,22 @@ main(int argc, char *argv[])
             if(verbose > 1)
                 fprintf(STDERR, "   Setting IHDR\n");
 
+#if defined(PNGCRUSH_LOCO)
+            output_format=0;
+            if(do_loco)
+            {
+                if(output_color_type == 2 || output_color_type == 6)
+                {
+                   output_format=1;
+                   filter_method = 64;
+                   png_permit_mng_features (write_ptr, PNG_FLAG_MNG_FILTER_64);
+                }
+            }
+            else
+                filter_method=0;
+            if(input_format != output_format)
+                things_have_changed = 1;
+#endif
             png_set_IHDR(write_ptr, write_info_ptr, width, height,
               output_bit_depth, output_color_type, output_interlace_method,
               compression_method, filter_method);
@@ -3561,6 +3641,39 @@ main(int argc, char *argv[])
       }
 #endif
 
+#ifdef PNGCRUSH_LOCO
+      if(do_loco)
+      {
+      png_byte buffer[30];
+      const png_byte png_MHDR[5] = { 77,  72,  68,  82, '\0'};
+      png_byte mng_signature[8] = {138, 77, 78, 71, 13, 10, 26, 10};
+      /* write the MNG 8 byte signature */
+      if(outname[strlen(outname)-3] == 'p')
+         png_warning(read_ptr, "  Writing a MNG file with a .png extension");
+      png_write_data(write_ptr, &mng_signature[0], (png_size_t)8);
+      png_set_sig_bytes(write_ptr, 8);
+
+      /* Write a MHDR chunk */
+
+      buffer[0]=(png_byte)((width>>24) & 0xff);
+      buffer[1]=(png_byte)((width>>16) & 0xff);
+      buffer[2]=(png_byte)((width>> 8) & 0xff);
+      buffer[3]=(png_byte)((width    ) & 0xff);
+      buffer[4]=(png_byte)((height>>24) & 0xff);
+      buffer[5]=(png_byte)((height>>16) & 0xff);
+      buffer[6]=(png_byte)((height>> 8) & 0xff);
+      buffer[7]=(png_byte)((height    ) & 0xff);
+      for (i=8; i<27; i++)
+         buffer[i]=0x00;
+      buffer[15]=1; /* frame count */
+      buffer[19]=2; /* layer count */
+      if(output_color_type == 6)
+        buffer[27]=0x09; /* simplicity profile: MNG-VLC with transparency */
+      else
+        buffer[27]=0x01; /* simplicity profile: MNG-VLC */
+      png_write_chunk(write_ptr, (png_bytep)png_MHDR, buffer, (png_size_t)28);
+      }
+#endif
       P2("writing info structure.\n");
       png_crush_pause();
       png_debug(0, "\nWriting info struct\n");
@@ -3888,6 +4001,14 @@ main(int argc, char *argv[])
       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
       if(nosave == 0)
       {
+#ifdef PNGCRUSH_LOCO
+         if(do_loco)
+         {
+            const png_byte png_MEND[5] = { 77,  69,  78,  68, '\0'};
+            /* write the MNG MEND chunk */
+            png_write_chunk(write_ptr, (png_bytep)png_MEND, NULL, (png_size_t)0);
+         }
+#endif
          png_destroy_info_struct(write_ptr, &write_end_info_ptr);
          png_destroy_write_struct(&write_ptr, &write_info_ptr);
       }
@@ -4076,10 +4197,23 @@ png_measure_idat(png_structp png_ptr)
 
    {
       png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+#if defined(PNGCRUSH_LOCO)
+      png_byte mng_signature[8] = {138, 77, 78, 71, 13, 10, 26, 10};
+#endif
 
       png_read_data(png_ptr, png_signature, 8);
       png_set_sig_bytes(png_ptr, 8);
 
+#if defined(PNGCRUSH_LOCO)
+      if (!(int)(png_memcmp(mng_signature, png_signature, 8)))
+      {
+         png_byte buffer[40];
+         /* skip the MHDR */
+         png_read_data(read_ptr, buffer, 40);
+         input_format=1;
+      }
+      else 
+#endif
       if (png_sig_cmp(png_signature, 0, 8))
       {
          if (png_sig_cmp(png_signature, 0, 4))
@@ -4280,11 +4414,25 @@ count_colors(FILE *fpin)
 #endif
 
    {
+#if defined(PNGCRUSH_LOCO)
+      png_byte mng_signature[8] = {138, 77, 78, 71, 13, 10, 26, 10};
+#endif
       png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
 
       png_read_data(read_ptr, png_signature, 8);
       png_set_sig_bytes(read_ptr, 8);
 
+#if defined(PNGCRUSH_LOCO)
+      if (!(int)(png_memcmp(mng_signature, png_signature, 8)))
+      {
+         png_byte buffer[40];
+         /* skip the MHDR */
+         png_read_data(read_ptr, buffer, 40);
+         png_permit_mng_features (read_ptr, PNG_FLAG_MNG_FILTER_64);
+         input_format=1;
+      }
+      else
+#endif
       if (png_sig_cmp(png_signature, 0, 8))
       {
          if (png_sig_cmp(png_signature, 0, 4))
@@ -4454,7 +4602,6 @@ count_colors(FILE *fpin)
                         reduce_to_gray=0;
                    if(it_is_opaque && (*(rp+3)) != 255)
                       it_is_opaque=0;
-
                    if (result > 1)
                       continue;
 #ifdef USE_HASHCODE
@@ -4672,7 +4819,6 @@ count_colors(FILE *fpin)
    }
    P2 ("Finished checking alphas, result=%d\n",result);
    }
-
    ret=result;
    return (ret);
 }

pngcrush.h

@@ -26,7 +26,7 @@
 #  define PNG_USER_MEM_SUPPORTED
 #endif
 
-#define MNG_EXTENSIONS_SUPPORTED /* extra filter types */
+#define PNG_MNG_FEATURES_SUPPORTED /* extra filter types */
 
 #ifndef PNG_NO_LEGACY_SUPPORTED
 #  define PNG_NO_LEGACY_SUPPORTED

pngerror.c

@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -99,7 +99,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
 void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_error(png_ptr, msg);
 }

pnggccrd.c

@@ -6,7 +6,7 @@
  *     and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
  *     for Intel's performance analysis of the MMX vs. non-MMX code.
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation

pngget.c

@@ -1,7 +1,7 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngmem.c

@@ -1,7 +1,7 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngpread.c

@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngread.c

@@ -1,7 +1,7 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -647,6 +647,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
       png_ptr->rowbytes + 1);
    
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
 
@@ -701,7 +710,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
  * not called png_set_interlace_handling(), the display_row buffer will
  * be ignored, so pass NULL to it.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta2
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta5
  */
 
 void PNGAPI
@@ -750,7 +759,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
  * only call this function once.  If you desire to have an image for
  * each pass of a interlaced image, use png_read_rows() instead.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta2
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta5
  */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)

pngrio.c

@@ -1,7 +1,7 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngrtran.c

@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 15, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -4053,3 +4053,63 @@ png_build_gamma_table(png_structp png_ptr)
 /* To do: install integer version of png_build_gamma_table here */
 #endif
 
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(65536+s0+s1)&0xffff;
+            png_uint_32 blue=(65536+s2+s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */

pngrutil.c

@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -353,7 +353,14 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (compression_type != PNG_COMPRESSION_TYPE_BASE)
       png_error(png_ptr, "Unknown compression method in IHDR");
 
-   if (filter_type != PNG_FILTER_TYPE_BASE)
+   if(
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+      !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+      (color_type == PNG_COLOR_TYPE_RGB || 
+       color_type == PNG_COLOR_TYPE_RGB_ALPHA)) &&
+#endif
+      filter_type != PNG_FILTER_TYPE_BASE)
       png_error(png_ptr, "Unknown filter method in IHDR");
 
    /* set internal variables */
@@ -362,6 +369,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->bit_depth = (png_byte)bit_depth;
    png_ptr->interlaced = (png_byte)interlace_type;
    png_ptr->color_type = (png_byte)color_type;
+   png_ptr->filter_type = (png_byte)filter_type;
 
    /* find number of channels */
    switch (png_ptr->color_type)

pngset.c

@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngtrans.c

@@ -1,7 +1,7 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -606,3 +606,4 @@ png_get_user_transform_ptr(png_structp png_ptr)
    return (NULL);
 #endif
 }
+

pngvcrd.c

@@ -2,7 +2,7 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation

pngwio.c

@@ -1,7 +1,7 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngwrite.c

@@ -1,7 +1,7 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -375,7 +375,11 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 
    /* write end of PNG file */
    png_write_IEND(png_ptr);
+#if 0
+/* This flush, added in libpng-1.0.8,  causes some applications to crash
+   because they do not set png_ptr->output_flush_fn */
    png_flush(png_ptr);
+#endif
 }
 
 #if defined(PNG_WRITE_tIME_SUPPORTED)
@@ -769,6 +773,15 @@ png_write_row(png_structp png_ptr, png_bytep row)
    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
 
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
 

pngwtran.c

@@ -1,7 +1,7 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 15, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -498,3 +498,64 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
    }
 }
 #endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(s0-s1)&0xffff;
+            png_uint_32 blue=(s2-s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */

pngwutil.c

@@ -1,7 +1,7 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 1.0.9beta2 - November 19, 2000
+ * libpng 1.0.9beta5 - December 14, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -419,7 +419,12 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
       compression_type = PNG_COMPRESSION_TYPE_BASE;
    }
 
-   if (filter_type != PNG_FILTER_TYPE_BASE)
+   if (
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+      !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
+#endif
+      filter_type != PNG_FILTER_TYPE_BASE)
    {
       png_warning(png_ptr, "Invalid filter type specified");
       filter_type = PNG_FILTER_TYPE_BASE;
@@ -440,6 +445,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
    png_ptr->bit_depth = (png_byte)bit_depth;
    png_ptr->color_type = (png_byte)color_type;
    png_ptr->interlaced = (png_byte)interlace_type;
+   png_ptr->filter_type = (png_byte)filter_type;
    png_ptr->width = width;
    png_ptr->height = height;
 
@@ -1072,13 +1078,14 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    png_size_t key_len;
    png_charp kp, dp;
    int kflag;
+   int kwarn=0;
 
    png_debug(1, "in png_check_keyword\n");
    *new_key = NULL;
 
    if (key == NULL || (key_len = png_strlen(key)) == 0)
    {
-      png_chunk_warning(png_ptr, "zero length keyword");
+      png_warning(png_ptr, "zero length keyword");
       return ((png_size_t)0);
    }
 
@@ -1095,9 +1102,9 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
          char msg[40];
 
          sprintf(msg, "invalid keyword character 0x%02X", *kp);
-         png_chunk_warning(png_ptr, msg);
+         png_warning(png_ptr, msg);
 #else
-         png_chunk_warning(png_ptr, "invalid character in keyword");
+         png_warning(png_ptr, "invalid character in keyword");
 #endif
          *dp = ' ';
       }
@@ -1112,7 +1119,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key + key_len - 1;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "trailing spaces removed from keyword");
+      png_warning(png_ptr, "trailing spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1125,7 +1132,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "leading spaces removed from keyword");
+      png_warning(png_ptr, "leading spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1147,6 +1154,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       else if (*kp == ' ')
       {
          key_len--;
+         kwarn=1;
       }
       else
       {
@@ -1155,17 +1163,19 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       }
    }
    *dp = '\0';
+   if(kwarn)
+      png_warning(png_ptr, "extra interior spaces removed from keyword");
 
    if (key_len == 0)
    {
       png_free(png_ptr, *new_key);
       *new_key=NULL;
-      png_chunk_warning(png_ptr, "Zero length keyword");
+      png_warning(png_ptr, "Zero length keyword");
    }
 
    if (key_len > 79)
    {
-      png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters");
+      png_warning(png_ptr, "keyword length must be 1 - 79 characters");
       new_key[79] = '\0';
       key_len = 79;
    }