--- pngcheck-2.3.0.CHANGELOG	2007-07-07 23:23:54.000000000 -0700
+++ CHANGELOG	2010-05-04 09:02:29.000000000 -0700
@@ -218,3 +218,7 @@
  *               method; fixed non-verbose-mode IDAT/PLTE message
  * 20070707 GRR: released version 2.3.0
  *               ----------------------
+ * 20070709 GRR: tweaked color definitions slightly to work better on terminals
+ *               with white/light backgrounds
+ * 20070712 GRR: added Makefile.mingw32
+ * 20100504 GRR: fixed DHDR (pre-MNG-1.0) bug identified by Winfried <szukw000@arcor.de>



--- /dev/null	2016-01-07 23:56:34.494165774 -0800
+++ Makefile.mingw32	2007-07-12 19:10:26.000000000 -0700
@@ -0,0 +1,71 @@
+# Sample makefile for pngcheck using mingw32-gcc (native or cross) and make.
+# Greg Roelofs
+# Last modified:  12 July 2007
+#
+# Invoke this makefile from a DOS-prompt window via:
+#
+#	make -f Makefile.mingw32
+#
+# This makefile assumes zlib has already been built or downloaded and is in
+# a subdirectory at the same level as the current subdirectory (as indicated
+# by the ZPATH macro below).  Edit as appropriate.
+#
+# Note that the names of the dynamic and static zlib libraries used below may
+# change in later releases of the library.  This makefile builds statically
+# linked executables, but that can be changed by uncommenting the appropriate
+# ZLIB line.
+
+
+# macros --------------------------------------------------------------------
+
+#ZPATH = ../zlib
+ZPATH = ../zlib-win32
+ZINC = -I$(ZPATH)
+#ZLIB = $(ZPATH)/libzdll.a #	link dynamically against DLL
+ZLIB = $(ZPATH)/libz.a #	link statically
+
+INCS = $(ZINC)
+LIBS = $(ZLIB)
+
+#CC = gcc
+CC = i386-mingw32msvc-gcc #	e.g., Linux -> Win32 cross-compilation
+LD = $(CC)
+RM = rm -f
+CFLAGS = -O -Wall $(INCS) $(MINGW_CCFLAGS) -DUSE_ZLIB
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+LDFLAGS = $(MINGW_LDFLAGS)
+O = .o
+E = .exe
+
+PROG  = pngcheck
+PROG2 = pngsplit
+PROG3 = png-fix-IDAT-windowsize
+
+EXES  = $(PROG)$(E) $(PROG2)$(E) $(PROG3)$(E)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+	$(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(PROG)$(E): $(PROG).c
+	$(CC) $(CFLAGS) -o $@ $(PROG).c $(LIBS)
+
+# both of these require zlib, too (for crc32() function)
+$(PROG2)$(E): gpl/$(PROG2).c
+	$(CC) $(CFLAGS) -o $@ gpl/$(PROG2).c $(LIBS)
+
+$(PROG3)$(E): gpl/$(PROG3).c
+	$(CC) $(CFLAGS) -o $@ gpl/$(PROG3).c $(LIBS)
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+	$(RM) $(EXES)



--- pngcheck-2.3.0.c	2007-07-07 23:23:31.000000000 -0700
+++ pngcheck-2.4.0-beta.c	2013-04-06 20:30:35.000000000 -0700
@@ -69,7 +69,7 @@
  *   - fix tEXt chunk:  small buffers or lots of text => truncation
  *       (see pngcheck-1.99.4-test.c.dif)
  *   - fix iCCP, sPLT chunks:  small buffers or large chunks => truncation?
- *   - update existing MNG support to version 1.0 (already done?)
+ *   - update existing MNG support to version 1.0 (DHDR bug just fixed 2010!)
  *   - add JNG restrictions to bKGD
  *   - allow top-level ancillary PNGs in MNG (i.e., subsequent ones may be NULL)
  *   * add MNG profile report based on actual chunks found
@@ -212,19 +212,19 @@
 
 /* GRR 20070704:  borrowed from GRR from/mailx hack */
 #define COLOR_NORMAL        "\033[0m"
-#define COLOR_RED_BOLD      "\033[01;31m"
+#define COLOR_RED_BOLD      "\033[40;31;1m"
 #define COLOR_RED           "\033[40;31m"
-#define COLOR_GREEN_BOLD    "\033[01;32m"
+#define COLOR_GREEN_BOLD    "\033[40;32;1m"
 #define COLOR_GREEN         "\033[40;32m"
-#define COLOR_YELLOW_BOLD   "\033[01;33m"
+#define COLOR_YELLOW_BOLD   "\033[40;33;1m"
 #define COLOR_YELLOW        "\033[40;33m"	/* chunk names */
-#define COLOR_BLUE_BOLD     "\033[01;34m"
+#define COLOR_BLUE_BOLD     "\033[40;34;1m"
 #define COLOR_BLUE          "\033[40;34m"
-#define COLOR_MAGENTA_BOLD  "\033[01;35m"
+#define COLOR_MAGENTA_BOLD  "\033[40;35;1m"
 #define COLOR_MAGENTA       "\033[40;35m"
-#define COLOR_CYAN_BOLD     "\033[01;36m"
+#define COLOR_CYAN_BOLD     "\033[40;36;1m"
 #define COLOR_CYAN          "\033[40;36m"
-#define COLOR_WHITE_BOLD    "\033[01;37m"	/* filenames, filter seps */
+#define COLOR_WHITE_BOLD    "\033[40;37;1m"	/* filenames, filter seps */
 #define COLOR_WHITE         "\033[40;37m"
 
 #define isASCIIalpha(x)     (ascii_alpha_table[x] & 0x1)
@@ -3261,7 +3373,7 @@
           (dtype < sizeof(delta_type)/sizeof(char *))?
           delta_type[dtype] : inv);
         if (sz > 4) {
-          if (dtype == 5) {
+          if (dtype == 7) {
             printf("%s  invalid %slength for delta type %d\n",
               verbose? ":":fname, verbose? "":"DHDR ", dtype);
             set_err(kMinorError);
@@ -3269,7 +3381,7 @@
             printf("    block width = %lu, block height = %lu\n", LG(buffer+4),
               LG(buffer+8));
             if (sz > 12) {
-              if (dtype == 0 || dtype == 5) {
+              if (dtype == 0) {
                 printf("%s  invalid %slength for delta type %d\n",
                   verbose? ":":fname, verbose? "":"DHDR ", dtype);
                 set_err(kMinorError);