diff --git a/ANNOUNCE b/ANNOUNCE
index 5f7effb..490a275 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,14 +1,14 @@
 
-Libpng 1.0.1b May 2, 1998
+Libpng 1.0.1c May 9, 1998
 
 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:
 
-libpng-1.0.1a:
+version 1.0.1a [April 21, 1998]
   Optimized Paeth calculations by replacing abs() function calls with intrinsics
-  plus other loop optimizations. Improves avg decoding speed by about 20 percent.
+  plus other loop optimizations. Improves avg decoding speed by about 20%.
   Commented out i386istic "align" compiler flags in makefile.lnx.
   Reduced the default warning level in some makefiles, to make them consistent.
   Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
@@ -20,7 +20,8 @@
   Moved a misplaced pngrutil code block that truncates tRNS if it has more
     than num_palette entries -- test was done before num_palette was defined.
   Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
-libpng-1.0.1b:
+  Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
+version 1.0.1b [May 2, 1998]
   Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
   Relocated the png_composite macros from pngrtran.c to png.h (Greg).
   Added makefile.sco (contributed by Mike Hopkirk).
@@ -29,6 +30,18 @@
   More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
   More work on loop optimization which may help when compiled with C++ compilers.
   Added warnings when people try to use transforms they've defined out.
+  Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
+  Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
+version 1.0.1c [May 9, 1998]
+  Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
+    filler bytes should have been 0xff instead of 0xf.
+  Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
+  Moved PNG_WRIGHT_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
+    out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
+  Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
+    for consistency, in pngconf.h
+  Added individual "ifndef PNG_NO_CAPABILITY" for the capabilities in pngconf.h
+    to make it easier to remove unwanted capabilities via the compile line
 
 Send comments/corrections/commendations to
 png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
diff --git a/CHANGES b/CHANGES
index 42a901d..3d72a09 100644
--- a/CHANGES
+++ b/CHANGES
@@ -310,3 +310,15 @@
   More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
   More work on loop optimization which may help when compiled with C++ compilers.
   Added warnings when people try to use transforms they've defined out.
+  Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
+  Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
+version 1.0.1c [May 9, 1998]
+  Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
+    filler bytes should have been 0xff instead of 0xf.
+  Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
+  Moved PNG_WRIGHT_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
+    out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
+  Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
+    for consistency, in pngconf.h
+  Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
+    to remove unwanted capabilities via the compile line
diff --git a/KNOWNBUG b/KNOWNBUG
index 64ab68d..1933fde 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -20,7 +20,8 @@
 
    pngrtran.c:  if-test for channels/FILLER may be incorrect
 
-   STATUS: Under investigation
+   STATUS: Under investigation.  Appears to be working correctly
+   in libpng-1.0.1c.
 
 4. March 15, 1998 -- BUG -- Kevin Bracey
 
@@ -52,11 +53,12 @@
                   png_uint_32 i;
                   for(i=0; i < s->a*s->b; i++)
               with
-                  png_uint_32 i, count;
+                  png_uint_32 i, istop;
                   istop = s->a*s->b;
                   for(i=0; i<istop; i++)
 
       STATUS: Mostly done in libpng-1.0.1a, done for all important loops.
+              More done in libpng-1.0.1b.
 
    c. Replace abs() with intrinsic ternary operations in Paeth
       filtering -- Glenn R-P
@@ -92,7 +94,7 @@
    be made possible at run time, via calls to new png_set_malloc_fn()
    and png_set_free_fn() functions.
 
-   STATUS: Will do in libpng-1.0.1b
+   STATUS: Under consideration
 
 9. April 11, 1998 -- BUG -- incorrect truncation of tRNS data in
    illegal PNG file where tRNS precedes PLTE -- Larry Reeve
@@ -131,3 +133,26 @@
    that a warning be issued in such cases.
 
    STATUS: Done in libpng-1.0.1b
+
+14. May 2, 1998 -- BUG -- incorrect mask for filler bytes
+
+   In pngrtran.c, png_do_filler(), the masks for hi_filler and low_filler
+   should be 0xff instead of 0xf
+
+   STATUS: Fixed in libpng-1.0.1c
+
+15. May 3, 1998 -- BUG -- buffer overflow in png_do_read_filler()
+
+   In pngrutil.c, max_pixel_depth needs to be set to 32 when using
+   png_do_read_filler with palette images.
+
+   STATUS: Fixed in libpng-1.0.1c (see also items 1 and 3 above).
+
+16. May 3, 1998 -- BUG -- type definitions wrong on error functions -- Tom Lane
+
+   In png_create_xxx_struct(), the error functions should have typedef
+   png_voidp instead of (void *).  Needs to be corrected in the functions,
+   the prototypes in png.h, the example.c file, and libpng.txt and libpng.3
+
+   
+   STATUS: Fixed in libpng-1.0.1c
diff --git a/TODO b/TODO
index 21f963a..36f2a78 100644
--- a/TODO
+++ b/TODO
@@ -1,7 +1,9 @@
 TODO - list of things to do for libpng
 
 fix problem with C++ and EXTERN "C"
+add capability to set user malloc/free functions at run time
 add "grayscale->palette" transformation and "palette->grayscale" detection
+color to gray transformation
 improved dithering
 multi-lingual error and warning message support
 sPLT chunk handling
diff --git a/example.c b/example.c
index bc86aed..a656c13 100644
--- a/example.c
+++ b/example.c
@@ -83,7 +83,7 @@
     * was compiled with a compatible version of the library.  REQUIRED
     */
    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-      (void *)user_error_ptr, user_error_fn, user_warning_fn);
+      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (png_ptr == NULL)
    {
@@ -362,7 +362,7 @@
     * linked libraries.
     */
    *png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-       (void *)user_error_ptr, user_error_fn, user_warning_fn);
+       png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (*png_ptr == NULL)
    {
@@ -498,7 +498,7 @@
     * in case we are using dynamically linked libraries.  REQUIRED.
     */
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
-      (void *)user_error_ptr, user_error_fn, user_warning_fn);
+      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (png_ptr == NULL)
    {
diff --git a/libpng.3 b/libpng.3
index eecbdaf..bd71d52 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "May 2, 1998"
+.TH LIBPNG 3 "May 9, 1998"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library
 .SH SYNOPSIS
@@ -396,7 +396,7 @@
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.1b May 2, 1998
+ libpng version 1.0.1c May 9, 1998
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
  Copyright (c) 1998, Glenn Randers-Pehrson
@@ -539,7 +539,7 @@
 on Changes to Libpng below regarding the old initialization functions.
 
     png_structp png_ptr = png_create_read_struct
-       (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+       (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
         return;
@@ -974,21 +974,19 @@
           png_set_gray_to_rgb(png_ptr);
 
 If you have a grayscale and you are using png_set_expand() to change to
-a higher bit-depth you must indicate if the supplied background gray
-is supplied in the original file bit depth (need_expand = 1) or in the
-expanded bit depth (need_expand = 0).  Similarly, if you are reading
-a paletted image, you must indicate if you have supplied the background
-as a palette index that needs to be expanded (need_expand = 1).  You can
-also specify an RGB triplet that isn't in the palette when setting your
-background for a paletted image.
+a higher bit-depth, you must either supply the background color as a gray
+value at the original file bit-depth (need_expand = 1) or else supply the
+background color as an RGB triplet at the final, expanded bit depth
+(need_expand = 0).  Similarly, if you are reading a paletted image, you
+must either supply the background color as a palette index (need_expand = 1)
+or as an RGB triplet that may or may not be in the palette (need_expand = 0).
 
     png_color_16 my_background;
     png_color_16p image_background;
 
-    if (png_get_bKGD(png_ptr, info_ptr,
-        &image_background))
-        png_set_background(png_ptr, image_background),
-        PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
+    if (png_get_bKGD(png_ptr, info_ptr, &image_background))
+        png_set_background(png_ptr, image_background,
+          PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
     else
         png_set_background(png_ptr, &my_background,
           PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
@@ -1271,7 +1269,7 @@
  initialize_png_reader()
  {
     png_ptr = png_create_read_struct
-        (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+        (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
          user_error_fn, user_warning_fn);
     if (!png_ptr)
         return -1;
@@ -1443,7 +1441,7 @@
 "read_ptr" and "write_ptr".  Look at pngtest.c, for example.
 
     png_structp png_ptr = png_create_write_struct
-       (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+       (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
        return;
@@ -2223,19 +2221,23 @@
 
 There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
-never going to use an ability, you can change the #define to #undef
-before recompiling libpng and save yourself code and data space.
-You can also turn a number of them off en masse with a compiler directive
-that defines PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED, or
-PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
+never going to use a capability, you can change the #define to #undef
+before recompiling libpng and save yourself code and data space, or
+you can turn off individual capabilities with defines that begin with
+PNG_NO_.
+
+You can also turn all of the transforms and ancillary chunk capabilities
+off en masse with  compiler directives that define
+PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
+or all four,
 along with directives to turn on any of the capabilities that you do
-want.  The PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED directives disable
+want.  The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable
 the extra transformations but still leave the library fully capable of reading
 and writing PNG files with all known public chunks [except for sPLT].
-Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
+Use of the PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive
 produces a library that is incapable of reading or writing ancillary chunks.
 If you are not using the progressive reading capability, you can
-turn that off with PNG_PROGRESSIVE_READ_NOT_SUPPORTED (don't confuse
+turn that off with PNG_NO_PROGRESSIVE_READ (don't confuse
 this with the INTERLACING capability, which you'll still have).
 
 All the reading and writing specific code are in separate files, so the
@@ -2372,7 +2374,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
   
-Libpng version 1.0.1b May 2, 1998:
+Libpng version 1.0.1c May 9, 1998:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
 
diff --git a/libpng.txt b/libpng.txt
index 02ac83c..295421d 100644
--- a/libpng.txt
+++ b/libpng.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.1b May 2, 1998
+ libpng version 1.0.1c May 9, 1998
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
  Copyright (c) 1998, Glenn Randers-Pehrson
@@ -143,7 +143,7 @@
 on Changes to Libpng below regarding the old initialization functions.
 
     png_structp png_ptr = png_create_read_struct
-       (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+       (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
         return;
@@ -578,21 +578,19 @@
           png_set_gray_to_rgb(png_ptr);
 
 If you have a grayscale and you are using png_set_expand() to change to
-a higher bit-depth you must indicate if the supplied background gray
-is supplied in the original file bit depth (need_expand = 1) or in the
-expanded bit depth (need_expand = 0).  Similarly, if you are reading
-a paletted image, you must indicate if you have supplied the background
-as a palette index that needs to be expanded (need_expand = 1).  You can
-also specify an RGB triplet that isn't in the palette when setting your
-background for a paletted image.
+a higher bit-depth, you must either supply the background color as a gray
+value at the original file bit-depth (need_expand = 1) or else supply the
+background color as an RGB triplet at the final, expanded bit depth
+(need_expand = 0).  Similarly, if you are reading a paletted image, you
+must either supply the background color as a palette index (need_expand = 1)
+or as an RGB triplet that may or may not be in the palette (need_expand = 0).
 
     png_color_16 my_background;
     png_color_16p image_background;
 
-    if (png_get_bKGD(png_ptr, info_ptr,
-        &image_background))
-        png_set_background(png_ptr, image_background),
-        PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
+    if (png_get_bKGD(png_ptr, info_ptr, &image_background))
+        png_set_background(png_ptr, image_background,
+          PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
     else
         png_set_background(png_ptr, &my_background,
           PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
@@ -875,7 +873,7 @@
  initialize_png_reader()
  {
     png_ptr = png_create_read_struct
-        (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+        (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
          user_error_fn, user_warning_fn);
     if (!png_ptr)
         return -1;
@@ -1047,7 +1045,7 @@
 "read_ptr" and "write_ptr".  Look at pngtest.c, for example.
 
     png_structp png_ptr = png_create_write_struct
-       (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
+       (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
        return;
@@ -1827,19 +1825,23 @@
 
 There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
-never going to use an ability, you can change the #define to #undef
-before recompiling libpng and save yourself code and data space.
-You can also turn a number of them off en masse with a compiler directive
-that defines PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED, or
-PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
+never going to use a capability, you can change the #define to #undef
+before recompiling libpng and save yourself code and data space, or
+you can turn off individual capabilities with defines that begin with
+PNG_NO_.
+
+You can also turn all of the transforms and ancillary chunk capabilities
+off en masse with  compiler directives that define
+PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
+or all four,
 along with directives to turn on any of the capabilities that you do
-want.  The PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED directives disable
+want.  The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable
 the extra transformations but still leave the library fully capable of reading
 and writing PNG files with all known public chunks [except for sPLT].
-Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
+Use of the PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive
 produces a library that is incapable of reading or writing ancillary chunks.
 If you are not using the progressive reading capability, you can
-turn that off with PNG_PROGRESSIVE_READ_NOT_SUPPORTED (don't confuse
+turn that off with PNG_NO_PROGRESSIVE_READ (don't confuse
 this with the INTERLACING capability, which you'll still have).
 
 All the reading and writing specific code are in separate files, so the
diff --git a/libpngpf.3 b/libpngpf.3
index 9c69fb5..f1fa296 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "May 2, 1998"
+.TH LIBPNGPF 3 "May 9, 1998"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library
 (private functions)
diff --git a/png.5 b/png.5
index 60d392c..0ef57d3 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "May 2, 1998"
+.TH PNG 5 "May 9, 1998"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index d76aee2..73f96ea 100644
--- a/png.c
+++ b/png.c
@@ -1,12 +1,12 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -16,7 +16,7 @@
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
  */
-char png_libpng_ver[12] = "1.0.1b";
+char png_libpng_ver[12] = "1.0.1c";
 
 /* Place to hold the signature string for a PNG file. */
 png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
diff --git a/png.h b/png.h
index 3f509b5..35c4c37 100644
--- a/png.h
+++ b/png.h
@@ -1,12 +1,12 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * For conditions of distribution and use, see the COPYRIGHT NOTICE below.
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998 Glenn Randers-Pehrson
- * May 2, 1998
+ * May 9, 1998
  *
  * Note about libpng version numbers:
  *
@@ -31,8 +31,9 @@
  *      1.00                      1.00      100  2.1.0 [int should be 10000]
  *      1.0.0                     1.0.0     100  2.1.0 [int should be 10000]
  *      1.0.1                     1.0.1   10001  2.1.0
- *      1.0.1a                    1.0.1a  10002  2.1.0
- *      1.0.1b                    1.0.1b  10002  2.1.0
+ *      1.0.1a                    1.0.1a  10002  2.1.0.1a
+ *      1.0.1b                    1.0.1b  10002  2.1.0.1b
+ *      1.0.1c                    1.0.1c  10002  2.1.0.1c
  *
  *    Henceforth the source version will match the shared-library minor
  *    and patch numbers; the shared-library major version number will be
@@ -119,7 +120,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.1b"
+#define PNG_LIBPNG_VER_STRING "1.0.1c"
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -711,12 +712,12 @@
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
 extern PNG_EXPORT(png_structp,png_create_read_struct)
-   PNGARG((png_const_charp user_png_ver, voidp error_ptr,
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn));
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory */
 extern PNG_EXPORT(png_structp,png_create_write_struct)
-   PNGARG((png_const_charp user_png_ver, voidp error_ptr,
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn));
 
 /* Write a PNG chunk - size, type, (optional) data, CRC. */
diff --git a/pngconf.h b/pngconf.h
index 74f3937..08b2404 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,12 +1,12 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 /* Any machine specific code is near the front of this file, so if you
@@ -237,72 +237,139 @@
 /* Any transformations 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" on the compile line,
-   then pick and choose which ones to define without having to edit
-   this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED if you
-   only want to have a png-compliant reader/writer but don't need
+   to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
+   on the compile line, then pick and choose which ones to define without
+   having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
+   if you only want to have a png-compliant reader/writer but don't need
    any of the extra transformations.  This saves about 80 kbytes in a
-   typical installation of the library.
+   typical installation of the library. (PNG_NO_* form added in version
+   1.0.1c, for consistency)
  */
 
 
-#ifndef PNG_READ_TRANSFORMS_NOT_SUPPORTED
+#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_READ_TRANSFORMS)
 #define PNG_READ_TRANSFORMS_SUPPORTED
 #endif
-#ifndef PNG_WRITE_TRANSFORMS_NOT_SUPPORTED
+#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_TRANSFORMS)
 #define PNG_WRITE_TRANSFORMS_SUPPORTED
 #endif
 
 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
+#ifndef PNG_NO_READ_EXPAND
 #define PNG_READ_EXPAND_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SHIFT
 #define PNG_READ_SHIFT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_PACK
 #define PNG_READ_PACK_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_BGR
 #define PNG_READ_BGR_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SWAP
 #define PNG_READ_SWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_PACKSWAP
 #define PNG_READ_PACKSWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_INVERT
 #define PNG_READ_INVERT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_DITHER
 #define PNG_READ_DITHER_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_BACKGROUND
 #define PNG_READ_BACKGROUND_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_16_TO_8
 #define PNG_READ_16_TO_8_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_FILLER
 #define PNG_READ_FILLER_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_GAMMA
 #define PNG_READ_GAMMA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_GRAY_TO_RGB
 #define PNG_READ_GRAY_TO_RGB_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SWAP_ALPHA
 #define PNG_READ_SWAP_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_INVERT_ALPHA
 #define PNG_READ_INVERT_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_STRIP_ALPHA
 #define PNG_READ_STRIP_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_USER_TRANSFORM
 #define PNG_READ_USER_TRANSFORM_SUPPORTED
+#endif
 /* the following aren't implemented yet
 #define PNG_READ_RGB_TO_GRAY_SUPPORTED
  */
 #endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
-#ifndef PNG_PROGRESSIVE_READ_NOT_SUPPORTED   /* if you don't do progressive   */
+#if !defined(PNG_NO_PROGRESSIVE_READ) && \
+ !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive   */
 #define PNG_PROGRESSIVE_READ_SUPPORTED       /* reading.  This is not talking */
 #endif                               /* about interlacing capability!  You'll */
               /* still have interlacing unless you change the following line: */
 #define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
+
+#ifndef PNG_NO_READ_COMPOSITED_NODIV
 #define PNG_READ_COMPOSITE_NODIV_SUPPORTED    /* well tested on Intel and SGI */
+#endif
 
 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
+#ifndef PNG_NO_WRITE_SHIFT
 #define PNG_WRITE_SHIFT_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_PACK
 #define PNG_WRITE_PACK_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_BGR
 #define PNG_WRITE_BGR_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_SWAP
 #define PNG_WRITE_SWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_PACKSWAP
 #define PNG_WRITE_PACKSWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_INVERT
 #define PNG_WRITE_INVERT_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_FILLER
 #define PNG_WRITE_FILLER_SUPPORTED  /* This is the same as WRITE_STRIP_ALPHA */
-#define PNG_WRITE_FLUSH_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_SWAP_ALPHA
 #define PNG_WRITE_SWAP_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_INVERT_ALPHA
 #define PNG_WRITE_INVERT_ALPHA_SUPPORTED
-#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_USER_TRANSFORM
 #define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#endif
 #endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
 
 #define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
                                             encoders, but can cause trouble
                                             if left undefined */
 
-#if !defined(PNG_NO_STDIO)
+#ifndef PNG_NO_WRITE_WEIGHTED_FILTER
+#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#endif
+
+#ifndef PNG_NO_WRITE_FLUSH
+#define PNG_WRITE_FLUSH_SUPPORTED
+#endif
+
+#ifndef PNG_NO_STDIO
 #define PNG_TIME_RFC1123_SUPPORTED
 #endif
 
@@ -322,7 +389,7 @@
  * png_get_x_offset_microns()
  * png_get_y_offset_microns()
  */
-#if !defined(PNG_NO_EASY_ACCESS)
+#ifndef PNG_NO_EASY_ACCESS
 #define PNG_EASY_ACCESS_SUPPORTED
 #endif
 
@@ -351,45 +418,100 @@
  * a bit smaller.
  */
 
-#ifndef PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED
+#if !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
 #define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
 #endif
-#ifndef PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED
+#if !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
 #define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 #endif
 
 #ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+#ifndef PNG_NO_PNG_READ_bKGD
 #define PNG_READ_bKGD_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_cHRM
 #define PNG_READ_cHRM_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_gAMA
 #define PNG_READ_gAMA_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_hIST
 #define PNG_READ_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_oFFs
 #define PNG_READ_oFFs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_pCAL
 #define PNG_READ_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_pHYs
 #define PNG_READ_pHYs_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sBIT
 #define PNG_READ_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_sRGB
 #define PNG_READ_sRGB_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tEXt
 #define PNG_READ_tEXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tIME
 #define PNG_READ_tIME_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tRNS
 #define PNG_READ_tRNS_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_zTXt
 #define PNG_READ_zTXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_OPT_PLTE
 #define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
-                                    /* PLTE chunk in RGB and RGBA images */
+#endif                              /* PLTE chunk in RGB and RGBA images */
 #endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
 
 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+#ifndef PNG_NO_PNG_WRITE_bKGD
 #define PNG_WRITE_bKGD_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_cHRM
 #define PNG_WRITE_cHRM_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_gAMA
 #define PNG_WRITE_gAMA_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_hIST
 #define PNG_WRITE_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_oFFs
 #define PNG_WRITE_oFFs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_pCAL
 #define PNG_WRITE_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_pHYs
 #define PNG_WRITE_pHYs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_sBIT
 #define PNG_WRITE_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_sRGB
 #define PNG_WRITE_sRGB_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tEXt
 #define PNG_WRITE_tEXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tIME
 #define PNG_WRITE_tIME_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tRNS
 #define PNG_WRITE_tRNS_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_zTXt
 #define PNG_WRITE_zTXt_SUPPORTED
+#endif
 #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 
 /* need the time information for reading tIME chunks */
diff --git a/pngerror.c b/pngerror.c
index 0e80124..f5d90cf 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,12 +1,12 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file provides a location for all error handling.  Users which
  * need special error handling are expected to write replacement functions
diff --git a/pngget.c b/pngget.c
index dd7b5c4..6891b51 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1,12 +1,12 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
diff --git a/pngmem.c b/pngmem.c
index bc8fb4b..2b3d271 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,12 +1,12 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to modify the code in this file
diff --git a/pngpread.c b/pngpread.c
index 87c4b01..e3f0d7a 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,12 +1,12 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
diff --git a/pngread.c b/pngread.c
index 402c382..f2ece96 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,12 +1,12 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -17,7 +17,7 @@
 
 /* Create a PNG structure for reading, and allocate any memory needed. */
 png_structp
-png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr,
+png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
    png_structp png_ptr;
@@ -82,7 +82,7 @@
 }
 
 /* Initialize PNG structure for reading, and allocate any memory needed.
-   This interface is depreciated in favour of the png_create_read_struct(),
+   This interface is deprecated in favour of the png_create_read_struct(),
    and it will eventually disappear. */
 void
 png_read_init(png_structp png_ptr)
diff --git a/pngrio.c b/pngrio.c
index 5d723d0..df84ca7 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,12 +1,12 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file provides a location for all input.  Users which need
  * special handling are expected to write a function which has the same
diff --git a/pngrtran.c b/pngrtran.c
index 157ba2b..6449ba8 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,12 +1,12 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file contains functions optionally called by an application 
  * in order to tell libpng how to handle data when reading a PNG.
@@ -576,13 +576,16 @@
 void
 png_init_read_transformations(png_structp png_ptr)
 {
-   int color_type = png_ptr->color_type;
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+   if(png_ptr == NULL) return;
+#endif
 
    png_debug(1, "in png_init_read_transformations\n");
 
 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
    if (png_ptr->transformations & PNG_BACKGROUND_EXPAND)
    {
+      int color_type = png_ptr->color_type;
       if (!(color_type & PNG_COLOR_MASK_COLOR))  /* i.e., GRAY or GRAY_ALPHA */
       {
          /* expand background chunk. */
@@ -1322,10 +1325,10 @@
             png_uint_32 i;
             png_uint_32 istop = row_info->rowbytes;
 
-            for (bp = row, i = 0; i < istop; i++, bp++)
+            for (bp = row, i = 0; i < istop; i++)
             {
                *bp >>= 1;
-               *bp &= 0x55;
+               *bp++ &= 0x55;
             }
             break;
          }
@@ -1337,43 +1340,37 @@
             png_byte mask = (png_byte)(((int)0xf0 >> shift[0]) & (int)0xf0) |
                (png_byte)((int)0xf >> shift[0]);
 
-            for (bp = row, i = 0; i < istop; i++, bp++)
+            for (bp = row, i = 0; i < istop; i++)
             {
                *bp >>= shift[0];
-               *bp &= mask;
+               *bp++ &= mask;
             }
             break;
          }
          case 8:
          {
-            png_bytep bp;
+            png_bytep bp = row;
             png_uint_32 i;
-            int cstop=(int)row_info->channels;
+            png_uint_32 istop = row_width * channels;
 
-            for (bp = row, i = 0; i < row_width; i++)
+            for (i = 0; i < istop; i++)
             {
-               for (c = 0; c < cstop; c++, bp++)
-               {
-                  *bp >>= shift[c];
-               }
+               *bp++ >>= shift[i%channels];
             }
             break;
          }
          case 16:
          {
-            png_bytep bp;
-            png_size_t i;
-            int cstop=(int)row_info->channels;
+            png_bytep bp = row;
+            png_uint_32 i;
+            png_uint_32 istop = channels * row_width;
 
-            for (bp = row, i = 0; i < row_width; i++)
+            for (i = 0; i < istop; i++)
             {
-               for (c = 0; c < cstop; c++, bp += 2)
-               {
-                  value = (png_uint_16)((*bp << 8) + *(bp + 1));
-                  value >>= shift[c];
-                  *bp = (png_byte)(value >> 8);
-                  *(bp + 1) = (png_byte)(value & 0xff);
-               }
+               value = (png_uint_16)((*bp << 8) + *(bp + 1));
+               value >>= shift[i%channels];
+               *bp++ = (png_byte)(value >> 8);
+               *bp++ = (png_byte)(value & 0xff);
             }
             break;
          }
@@ -1620,8 +1617,8 @@
    png_uint_32 i;
    png_uint_32 row_width = row_info->width;
 
-   png_byte hi_filler = (png_byte)((filler>>8) & 0xf);
-   png_byte low_filler = (png_byte)(filler & 0xf);
+   png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
+   png_byte low_filler = (png_byte)(filler & 0xff);
 
    png_debug(1, "in png_do_read_filler\n");
    if (
diff --git a/pngrutil.c b/pngrutil.c
index d4f0d74..428188b 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,12 +1,12 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file contains routines which are only called from within
  * libpng itself during the course of reading an image.
@@ -73,7 +73,7 @@
    png_size_t i;
    png_size_t istop = png_ptr->zbuf_size;
 
-   for (i = skip; i > istop; i -= istop)
+   for (i = (png_size_t)skip; i > istop; i -= istop)
    {
       png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
    }
@@ -2225,7 +2225,7 @@
 png_read_start_row(png_structp png_ptr)
 {
    int max_pixel_depth;
-   png_uint_32 rowbytes;
+   png_uint_32 row_bytes;
 
    png_debug(1, "in png_read_start_row\n");
    png_ptr->zstream.avail_in = 0;
@@ -2243,10 +2243,10 @@
          png_pass_start[png_ptr->pass]) /
          png_pass_inc[png_ptr->pass];
 
-         rowbytes = ((png_ptr->iwidth *
+         row_bytes = ((png_ptr->iwidth *
             (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
-         png_ptr->irowbytes = (png_size_t)rowbytes;
-         if((png_uint_32)png_ptr->irowbytes != rowbytes)
+         png_ptr->irowbytes = (png_size_t)row_bytes;
+         if((png_uint_32)png_ptr->irowbytes != row_bytes)
             png_error(png_ptr, "Rowbytes overflow in png_read_start_row");
    }
    else
@@ -2293,7 +2293,9 @@
 #if defined(PNG_READ_FILLER_SUPPORTED)
    if (png_ptr->transformations & (PNG_FILLER))
    {
-      if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
+      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         max_pixel_depth = 32;
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
       {
          if (max_pixel_depth <= 8)
             max_pixel_depth = 16;
@@ -2333,16 +2335,16 @@
 
    /* align the width on the next larger 8 pixels.  Mainly used
       for interlacing */
-   rowbytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
+   row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
    /* calculate the maximum bytes needed, adding a byte and a pixel
       for safety's sake */
-   rowbytes = ((rowbytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
+   row_bytes = ((row_bytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
       1 + ((max_pixel_depth + 7) >> 3);
 #ifdef PNG_MAX_MALLOC_64K
-   if (rowbytes > (png_uint_32)65536L)
+   if (row_bytes > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, rowbytes);
+   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, row_bytes);
 
 #ifdef PNG_MAX_MALLOC_64K
    if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
diff --git a/pngset.c b/pngset.c
index 9eb606a..d186d18 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,12 +1,12 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data
diff --git a/pngtest.c b/pngtest.c
index f267061..85ffce2 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,12 +1,12 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * 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
diff --git a/pngtrans.c b/pngtrans.c
index 294088d..85e9561 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,12 +1,12 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
diff --git a/pngwio.c b/pngwio.c
index 3a91041..a7ac6b0 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,12 +1,12 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.1b
+ * libpng 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  *
  * This file provides a location for all output.  Users which need
  * special handling are expected to write functions which have the same
diff --git a/pngwrite.c b/pngwrite.c
index 16975ed..59a2f39 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,12 +1,12 @@
    
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 /* get internal access to png.h */
@@ -281,7 +281,7 @@
 
 /* Initialize png_ptr structure, and allocate any memory needed */
 png_structp
-png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
    png_structp png_ptr;
diff --git a/pngwtran.c b/pngwtran.c
index c6a4201..fc1ba7c 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,12 +1,12 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -218,9 +218,8 @@
       row_info->color_type != PNG_COLOR_TYPE_PALETTE)
    {
       int shift_start[4], shift_dec[4];
-      int channels;
+      int channels = 0;
 
-      channels = 0;
       if (row_info->color_type & PNG_COLOR_MASK_COLOR)
       {
          shift_start[channels] = row_info->bit_depth - bit_depth->red;
@@ -281,26 +280,23 @@
       {
          png_bytep bp = row;
          png_uint_32 i;
-         png_uint_32 row_width = row_info->width;
+         png_uint_32 istop = channels * row_info->width;
 
-         for (i = 0; i < row_width; i++)
+         for (i = 0; i < istop; i++, bp++)
          {
-            int c;
 
-            for (c = 0; c < channels; c++, bp++)
+            png_uint_16 v;
+            int j;
+            int c = (int)(i%channels);
+
+            v = *bp;
+            *bp = 0;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
             {
-               png_uint_16 v;
-               int j;
-
-               v = *bp;
-               *bp = 0;
-               for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-               {
-                  if (j > 0)
-                     *bp |= (png_byte)((v << j) & 0xff);
-                  else
-                     *bp |= (png_byte)((v >> (-j)) & 0xff);
-               }
+               if (j > 0)
+                  *bp |= (png_byte)((v << j) & 0xff);
+               else
+                  *bp |= (png_byte)((v >> (-j)) & 0xff);
             }
          }
       }
@@ -308,29 +304,25 @@
       {
          png_bytep bp;
          png_uint_32 i;
-         png_uint_32 row_width = row_info->width;
+         png_uint_32 istop = channels * row_info->width;
 
-         for (bp = row, i = 0; i < row_width; i++)
+         for (bp = row, i = 0; i < istop; i++)
          {
-            int c;
+            int c = (int)(i%channels);
+            png_uint_16 value, v;
+            int j;
 
-            for (c = 0; c < channels; c++, bp += 2)
+            v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
+            value = 0;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
             {
-               png_uint_16 value, v;
-               int j;
-
-               v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
-               value = 0;
-               for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-               {
-                  if (j > 0)
-                     value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
-                  else
-                     value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
-               }
-               *bp = (png_byte)(value >> 8);
-               *(bp + 1) = (png_byte)(value & 0xff);
+               if (j > 0)
+                  value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
+               else
+                  value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
             }
+            *bp++ = (png_byte)(value >> 8);
+            *bp++ = (png_byte)(value & 0xff);
          }
       }
    }
diff --git a/pngwutil.c b/pngwutil.c
index 5355bfb..ee5e6dc 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,12 +1,12 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * 1.0.1b
+ * 1.0.1c
  * 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
- * May 2, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -1432,7 +1432,6 @@
       png_bytep rp;
       png_uint_32 sum = 0;
       png_uint_32 i;
-      int j;
       int v;
 
       for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
@@ -1445,6 +1444,7 @@
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
          png_uint_32 sumhi, sumlo;
+         int j;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
 
@@ -1484,7 +1484,6 @@
    {
       png_bytep rp, lp, dp;
       png_uint_32 i;
-      int j;
       for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
            i++, rp++, dp++)
       {
@@ -1503,7 +1502,6 @@
       png_bytep rp, dp, lp;
       png_uint_32 sum = 0, lmins = mins;
       png_uint_32 i;
-      int j;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1513,6 +1511,7 @@
        */
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1561,6 +1560,7 @@
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1615,13 +1615,13 @@
       png_bytep rp, dp, pp;
       png_uint_32 sum = 0, lmins = mins;
       png_uint_32 i;
-      int j;
       int v;
 
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1663,6 +1663,7 @@
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1720,12 +1721,12 @@
       png_bytep rp, dp, pp, lp;
       png_uint_32 sum = 0, lmins = mins;
       png_uint_32 i;
-      int j;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1774,6 +1775,7 @@
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1852,12 +1854,12 @@
       png_bytep rp, dp, pp, cp, lp;
       png_uint_32 sum = 0, lmins = mins;
       png_uint_32 i;
-      int j;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
@@ -1938,6 +1940,7 @@
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
diff --git a/scripts/makefile.lnx b/scripts/makefile.lnx
index 0ad1663..0c149e7 100644
--- a/scripts/makefile.lnx
+++ b/scripts/makefile.lnx
@@ -29,7 +29,7 @@
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.1b
+PNGMIN = 1.0.1c
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h
diff --git a/scripts/makefile.s2x b/scripts/makefile.s2x
index 2d4afc4..afa03a5 100644
--- a/scripts/makefile.s2x
+++ b/scripts/makefile.s2x
@@ -29,7 +29,7 @@
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.1b
+PNGMIN = 1.0.1c
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 635451b..36568de 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -22,7 +22,7 @@
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.1b
+PNGMIN = 1.0.1c
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h