diff --git a/CHANGES b/CHANGES
index 9ccbaf5..cffbe93 100644
--- a/CHANGES
+++ b/CHANGES
@@ -214,5 +214,14 @@
    define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
    added type casting to all png_malloc() function calls
 version 0.99a [January 31, 1998]
-   added type casts and parentheses to all returns that return a value.(Tim W.)
-
+   Added type casts and parentheses to all returns that return a value.(Tim W.)
+version 0.99b [February 4, 1998]
+   Added type cast png_uint_32 on malloc function calls where needed.
+   Changed type of num_hist from png_uint_32 to int (same as num_palette).
+   Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
+   Renamed makefile.elf to makefile.lnx.
+version 0.99c [February 7, 1998]
+   More type casting.  Removed erroneous overflow test in pngmem.c.
+   Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
+   Added UNIX manual pages libpng.3, initially created by R. P. C. Rodgers,
+      U.S. National Library of Medicine (rodgers@nlm.nih.gov), and png.5.
diff --git a/README b/README
index bf0c9dd..223cc56 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-[NOTE:  this is still beta version 0.99a; the text below has already
+[NOTE:  this is still beta version 0.99c; the text below has already
  been updated in anticipation of the imminent 1.0 release.]
 
 
diff --git a/libpng.3 b/libpng.3
new file mode 100644
index 0000000..34bbda8
--- /dev/null
+++ b/libpng.3
@@ -0,0 +1,102 @@
+.TH PNG 5 "February 7, 1998"
+.SH NAME
+libpng \- Portable Network Graphics (PNG) format
+.SH SYNOPSIS
+[see
+.I png.h
+for full description]
+.SH DESCRIPTION
+The
+.I libpng
+library supports encoding, decoding, and various manipulations of
+the Portable Network Graphics (PNG) format image files.  It uses the
+.IR zlib(3)
+compression library.
+.SH "SEE ALSO"
+.IR libpng :
+.IP
+ftp://ftp.uu.net/graphics/png
+http://www.cdrom.com/pub/png
+.LP
+.IR zlib :
+.IP
+(generally) at the same location as
+.I libpng
+or at
+.br
+ftp://ftp.uu.net/pub/archiving/zip/zlib
+.br
+http://www.cdrom.com/pub/infozip/zlib
+.LP
+PNG specification:
+RFC 2083
+.IP
+(generally) at the same location as
+.I libpng
+or at
+.br
+ftp://ds.internic.net/rfc/rfc2083.txt
+.br
+or (as a W3C Recommendation) at
+.br
+http://www.w3.org/TR/REC-png.html
+.SH AUTHORS
+This man page: R. P. C. Rodgers and Glenn Randers-Pehrson
+.LP
+Libpng version 0.99c (February 7, 1998):
+Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
+Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
+.LP
+Supported by the PNG development group
+.br
+(png-implement@dworkin.wustl.edu).
+.LP
+
+.SH COPYRIGHT NOTICE
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+.br
+Copyright (c) 1996, 1997 Andreas Dilger
+.br
+Copyright (c) 1998 Glenn Randers-Pehrson
+.br
+
+.LP
+The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+and Group 42, Inc. disclaim all warranties, expressed or implied,
+including, without limitation, the warranties of merchantability and of
+fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+assume no liability for direct, indirect, incidental, special, exemplary,
+or consequential damages, which may result from the use of the PNG
+Reference Library, even if advised of the possibility of such damage.
+.LP
+Permission is hereby granted to use, copy, modify, and distribute this
+source code, or portions hereof, for any purpose, without fee, subject
+to the following restrictions:
+.br
+
+1. The origin of this source code must not be misrepresented.
+.br
+
+2. Altered versions must be plainly marked as such and must not be
+misrepresented as being the original source.
+.br
+
+3. This Copyright notice may not be removed or altered from any source or
+altered source distribution.
+.br
+
+.LP
+The Contributing Authors and Group 42, Inc. specifically permit, without
+fee, and encourage the use of this source code as a component to
+supporting the PNG file format in commercial products.  If you use this
+source code in a product, acknowledgment is not required but would be
+appreciated.
+
+.LP
+The
+.IR zlib (3)
+library, version 1.0.8,
+is copyright (C) 1995-1998 by Jean-loup Gailly and Mark Adler.
+.LP
+.\" end of man page
+
diff --git a/libpng.txt b/libpng.txt
index 39b6e34..93bd4ea 100644
--- a/libpng.txt
+++ b/libpng.txt
@@ -1,9 +1,9 @@
 libpng.txt - a description on how to use and modify libpng
 
-   libpng version 0.99a
+   libpng version 0.99c
    Updated and distributed by Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
    Copyright (c) 1998, Glenn Randers-Pehrson
-   January 31, 1998
+   February 7, 1998
 
       based on:
 
@@ -35,7 +35,7 @@
 of reducing the amount of time and effort it takes to support the PNG
 file format in application programs.  The PNG specification is available
 as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/pub/WWW/TR/REC.png.html>. Some
+W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
 additional chunks are described in the special-purpose public chunks
 documents at <ftp://ftp.uu.net/graphics/png/documents/>.  Other information
 about PNG can be found at the PNG home page, <http://www.cdrom.com/pub/png/>.
diff --git a/makefile.elf b/makefile.lnx
similarity index 100%
rename from makefile.elf
rename to makefile.lnx
diff --git a/makefile.msc b/makefile.msc
index c4ac7db..742de4e 100644
--- a/makefile.msc
+++ b/makefile.msc
@@ -5,7 +5,7 @@
 
 # ------------- Microsoft C 5.1 and later -------------
 MODEL=-AL
-CFLAGS=-Oait -Gs -nologo -W2 $(MODEL) -I..\zlib
+CFLAGS=-Oait -Gs -nologo -W3 $(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
diff --git a/png.5 b/png.5
new file mode 100644
index 0000000..c006411
--- /dev/null
+++ b/png.5
@@ -0,0 +1,44 @@
+.TH PNG 5 "February 7, 1998"
+.SH NAME
+png \- Portable Network Graphics (PNG) format
+.SH DESCRIPTION
+PNG (Portable Network Graphics) is an extensible file format for the
+lossless, portable, well-compressed storage of raster images. PNG provides
+a patent-free replacement for GIF and can also replace many
+common uses of TIFF. Indexed-color, grayscale, and truecolor images are
+supported, plus an optional alpha channel. Sample depths range from
+1 to 16 bits. 
+.br
+
+PNG is designed to work well in online viewing applications, such as the
+World Wide Web, so it is fully streamable with a progressive display
+option. PNG is robust, providing both full file integrity checking and
+fast, simple detection of common transmission errors. Also, PNG can store
+gamma and chromaticity data for improved color matching on heterogeneous
+platforms. 
+
+.SH "SEE ALSO"
+.IR libpng(3), zlib(3), deflate(5), and zlib(5)
+.LP
+PNG specification:
+RFC 2083
+.IP
+.br
+ftp://ds.internic.net/rfc/rfc2083.txt
+.br
+or (as a W3C Recommendation) at
+.br
+http://www.w3.org/TR/REC-png.html
+.SH AUTHORS
+This man page: Glenn Randers-Pehrson
+.LP
+Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
+Thomas Boutell and others (png-list@dworkin.wustl.edu).
+.LP
+
+.SH COPYRIGHT NOTICE
+The PNG specification is copyright (c) 1996 Massachussets Institute of
+Technology.  See the specification for conditions of use and distribution.
+.LP
+.\" end of man page
+
diff --git a/png.c b/png.c
index 8a6b7cf..1601e80 100644
--- a/png.c
+++ b/png.c
@@ -1,12 +1,12 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 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[6] = "0.99";
+char png_libpng_ver[5] = "0.99";
 
 /* Place to hold the signature string for a PNG file. */
 png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -268,7 +268,7 @@
    png_free(png_ptr, info_ptr->pcal_units);
    if (info_ptr->pcal_params != NULL)
    {
-      for (i = 0; i < info_ptr->pcal_nparams; i++)
+      for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
       {
          png_free(png_ptr, info_ptr->pcal_params[i]);
       }
diff --git a/png.h b/png.h
index cb7c7cc..0e6362c 100644
--- a/png.h
+++ b/png.h
@@ -1,12 +1,12 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng 0.99a beta
- * For conditions of distribution and use, see copyright notice in png.h
+ * libpng 0.99c beta
+ * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * Note about libpng version numbers:
  *
@@ -28,6 +28,8 @@
  *      0.98                      0.98      2.0.98
  *      0.99                      0.99      2.0.99
  *      0.99a                     0.99      2.0.99
+ *      0.99b                     0.99      2.0.99
+ *      0.99c                     0.99      2.0.99
  *      1.0                       1.00      2.1.0
  *
  *    Henceforth the source version will match the shared-library minor
@@ -47,12 +49,12 @@
  *
  * See libpng.txt for more information.  The PNG specification is available
  * as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
- * and as a W3C Recommendation <http://www.w3.org/pub/WWW/TR/REC.png.html>
+ * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
  *
  * Contributing Authors:
  *    John Bowler
- *    Sam Bushell
  *    Kevin Bracey
+ *    Sam Bushell
  *    Andreas Dilger
  *    Magnus Holmgren
  *    Tom Lane
@@ -70,6 +72,8 @@
  *
  * Thanks to Frank J. T. Wojcik for helping with the documentation.
  *
+ * COPYRIGHT NOTICE:
+ *
  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
  * and Group 42, Inc. disclaim all warranties, expressed or implied,
  * including, without limitation, the warranties of merchantability and of
@@ -247,7 +251,7 @@
    png_uint_32 width;       /* width of image in pixels (from IHDR) */
    png_uint_32 height;      /* height of image in pixels (from IHDR) */
    png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
-   png_size_t rowbytes;     /* bytes needed to hold an untransformed row */
+   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
    png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
    png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
    png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
@@ -481,7 +485,7 @@
 typedef struct png_row_info_struct
 {
    png_uint_32 width; /* width of row */
-   png_size_t rowbytes; /* number of bytes in row */
+   png_uint_32 rowbytes; /* number of bytes in row */
    png_byte color_type; /* color type of row */
    png_byte bit_depth; /* bit depth of row */
    png_byte channels; /* number of channels (1, 2, 3, or 4) */
@@ -544,8 +548,8 @@
    png_uint_32 height;        /* height of image in pixels */
    png_uint_32 num_rows;      /* number of rows in current pass */
    png_uint_32 usr_width;     /* width of row at start of write */
-   png_size_t rowbytes;       /* size of row in bytes */
-   png_size_t irowbytes;      /* size of current interlaced row in bytes */
+   png_uint_32 rowbytes;      /* size of row in bytes */
+   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
    png_uint_32 iwidth;        /* width of current interlaced row in pixels */
    png_uint_32 row_number;    /* current row in interlace pass */
    png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
@@ -1105,6 +1109,12 @@
 /* frees a pointer allocated by png_malloc() */
 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
 
+extern PNG_EXPORT(void,png_buffered_memcpy) PNGARG((png_structp png_ptr,
+   png_voidp s1, png_voidp s2, png_uint_32 size));
+
+extern PNG_EXPORT(void,png_buffered_memset) PNGARG((png_structp png_ptr,
+   png_voidp s1, int value, png_uint_32 size));
+
 #ifdef PNGTEST_MEMORY_DEBUG
 /* debugging versions of png_malloc() and png_free() */
 extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
@@ -1434,10 +1444,10 @@
 #define PNG_GAMMA              0x2000
 #define PNG_GRAY_TO_RGB        0x4000
 #define PNG_FILLER             0x8000
-#define PNG_PACKSWAP          0x10000
-#define PNG_SWAP_ALPHA        0x20000
-#define PNG_STRIP_ALPHA       0x40000
-#define PNG_INVERT_ALPHA      0x80000
+#define PNG_PACKSWAP          0x10000L
+#define PNG_SWAP_ALPHA        0x20000L
+#define PNG_STRIP_ALPHA       0x40000L
+#define PNG_INVERT_ALPHA      0x80000L
 
 /* flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001
@@ -1483,7 +1493,7 @@
    abs((int)((c1).blue) - (int)((c2).blue)))
 
 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#ifndef PNG_NO_EXTERN
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* place to hold the signature string for a PNG file. */
 extern png_byte FARDATA png_sig[8];
 
@@ -1677,7 +1687,7 @@
 
 #if defined(PNG_WRITE_hIST_SUPPORTED)
 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
-   png_uint_32 num_hist));
+   int num_hist));
 #endif
 
 #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
diff --git a/pngconf.h b/pngconf.h
index f14f0e1..1829d61 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,12 +1,12 @@
 
-/* pngconf.c - machine configurable file for libpng
+/* pngconf.h - machine configurable file for libpng
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 /* Any machine specific code is near the front of this file, so if you
diff --git a/pngerror.c b/pngerror.c
index 15edb72..14e9a9e 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,12 +1,12 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * This file provides a location for all error handling.  Users which
  * need special error handling are expected to write replacement functions
@@ -81,7 +81,7 @@
    }
 
    if (message == NULL)
-      buffer[iout++] = 0;
+      buffer[iout] = 0;
    else {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
diff --git a/pngget.c b/pngget.c
index d241327..3e0eebf 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1,12 +1,12 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -126,14 +126,14 @@
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit == 0)
-         return (0.0);
+         return ((float)0.0);
       else
          return ((float)info_ptr->y_pixels_per_unit
             /(float)info_ptr->x_pixels_per_unit);
    }
    else
 #endif
-      return (0.0);
+      return ((float)0.0);
 }
 
 png_uint_32
@@ -209,7 +209,7 @@
    if (info_ptr != NULL)
       return(info_ptr->channels);
    else
-      return(0);
+      return (0);
 }
 
 png_bytep
@@ -218,7 +218,7 @@
    if (info_ptr != NULL)
       return(info_ptr->signature);
    else
-      return(NULL);
+      return (NULL);
 }
 
 #if defined(PNG_READ_bKGD_SUPPORTED)
@@ -322,6 +322,10 @@
    if (info_ptr != NULL && width != NULL && height != NULL &&
       bit_depth != NULL && color_type != NULL)
    {
+      png_uint_32 rowbytes;
+      int pixel_depth, channels;
+      png_uint_32 rowbytes_per_pixel;
+
       png_debug1(1, "in %s retrieval function\n", "IHDR");
       *width = info_ptr->width;
       *height = info_ptr->height;
@@ -333,6 +337,24 @@
          *filter_type = info_ptr->filter_type;
       if (interlace_type != NULL)
          *interlace_type = info_ptr->interlace_type;
+
+      /* check for potential overflow of rowbytes */
+      if (*color_type == PNG_COLOR_TYPE_PALETTE)
+         channels = 1;
+      else if (*color_type & PNG_COLOR_MASK_COLOR)
+         channels = 3;
+      else
+         channels = 1;
+      if (*color_type & PNG_COLOR_MASK_ALPHA)
+         channels++;
+      pixel_depth = *bit_depth * channels;
+      rowbytes_per_pixel = (pixel_depth + 7) >> 3;
+      rowbytes = *width * rowbytes_per_pixel;
+      if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+      {
+         png_warning(png_ptr,
+            "Width too large for libpng to process image data.");
+      }
       return (1);
    }
    return (0);
diff --git a/pngmem.c b/pngmem.c
index cbc83c5..004288f 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,11 +1,11 @@
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * This file provides a location for all memory allocation.  Users which
  * need special memory handling are expected to modify the code in this file
@@ -261,14 +261,11 @@
    {
 #if defined(__TURBOC__) && !defined(__FLAT__)
       farfree(struct_ptr);
-      struct_ptr = NULL;
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
       hfree(struct_ptr);
-      struct_ptr = NULL;
 # else
       free(struct_ptr);
-      struct_ptr = NULL;
 # endif
 #endif
    }
@@ -285,21 +282,27 @@
 PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ret;
+   png_size_t length;
+
    if (png_ptr == NULL || size == 0)
       return ((png_voidp)NULL);
 
 #ifdef PNG_MAX_MALLOC_64K
-   if (size > (png_uint_32)65536L)
+   if (png_size > (png_uint_32)65536L)
       png_error(png_ptr, "Cannot Allocate > 64K");
 #endif
 
+   length = (png_size_t)size;
+   if ((png_uint_32)length != size)
+      png_error(png_ptr, "Cannot Allocate > size_t");
+
 #if defined(__TURBOC__) && !defined(__FLAT__)
-   ret = farmalloc((png_size_t)size);
+   ret = farmalloc(length);
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
-   ret = halloc(size, 1);
+   ret = halloc(length, 1);
 # else
-   ret = malloc(size);
+   ret = malloc(length);
 # endif
 #endif
 
@@ -322,17 +325,43 @@
 
 #if defined(__TURBOC__) && !defined(__FLAT__)
    farfree(ptr);
-   ptr = NULL;
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
    hfree(ptr);
-   ptr = NULL;
 # else
    free(ptr);
-   ptr = NULL;
 # endif
 #endif
 }
 
 #endif /* Not Borland DOS special memory handler */
 
+void
+png_buffered_memcpy (png_structp png_ptr, png_voidp s1, png_voidp s2,
+   png_uint_32 length)
+{
+   png_size_t size;
+   png_uint_32 i;
+   for (i=0; i<length; i+=65530)
+   {
+      size = (png_size_t)(length - i);
+      if (size > (png_size_t)65530L)
+         size=(png_size_t)65530L;
+      png_memcpy (s1, s2, size);
+   }
+}
+
+void
+png_buffered_memset (png_structp png_ptr, png_voidp s1, int value,
+   png_uint_32 length)
+{
+   png_size_t size;
+   png_uint_32 i;
+   for (i=0; i<length; i+=65530)
+   {
+      size = length - i;
+      if (size > 65530)
+         size=65530;
+      png_memset (s1, value, size);
+   }
+}
diff --git a/pngpread.c b/pngpread.c
index 647ad10..89d9226 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,12 +1,12 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -466,7 +466,8 @@
 
       new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
       old_buffer = png_ptr->save_buffer;
-      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, new_max);
+      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, 
+         (png_uint_32)new_max);
       png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
       png_free(png_ptr, old_buffer);
       png_ptr->save_buffer_max = new_max;
@@ -527,7 +528,12 @@
       png_size_t save_size;
 
       if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
-         save_size = png_ptr->idat_size;
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+         /* check for overflow */
+         if((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
       else
          save_size = png_ptr->save_buffer_size;
 
@@ -544,7 +550,12 @@
       png_size_t save_size;
 
       if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
-         save_size = png_ptr->idat_size;
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+         /* check for overflow */
+         if((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
       else
          save_size = png_ptr->current_buffer_size;
 
@@ -619,6 +630,7 @@
    png_ptr->row_info.channels = png_ptr->channels;
    png_ptr->row_info.bit_depth = png_ptr->bit_depth;
    png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
+   
    png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
@@ -626,7 +638,8 @@
       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
       (int)(png_ptr->row_buf[0]));
 
-   png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
+   png_buffered_memcpy(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
@@ -761,7 +774,8 @@
    if (png_ptr->interlaced)
    {
       png_ptr->row_number = 0;
-      png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+      png_buffered_memset(png_ptr, png_ptr->prev_row, 0,
+         (png_size_t)png_ptr->rowbytes + 1);
       do
       {
          png_ptr->pass++;
@@ -771,8 +785,7 @@
             png_pass_inc[png_ptr->pass] - 1 -
             png_pass_start[png_ptr->pass]) /
             png_pass_inc[png_ptr->pass];
-         png_ptr->irowbytes = ((png_ptr->iwidth *
-            png_ptr->pixel_depth + 7) >> 3) + 1;
+         png_ptr->irowbytes = ((png_ptr->pixel_depth + 7) >> 3) + 1;
          if (!(png_ptr->transformations & PNG_INTERLACE))
          {
             png_ptr->num_rows = (png_ptr->height +
@@ -806,11 +819,12 @@
    }
 #endif
 
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr, length+1);
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr, 
+         (png_uint_32)(length+1));
    png_ptr->current_text[length] = '\0';
    png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = length;
-   png_ptr->current_text_left = length;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
    png_ptr->process_mode = PNG_READ_tEXt_MODE;
 }
 
@@ -857,7 +871,7 @@
       if (text != key + png_ptr->current_text_size)
          text++;
 
-      text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
       text_ptr->key = key;
       text_ptr->text = text;
@@ -889,11 +903,12 @@
    }
 #endif
 
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr, length+1);
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+       (png_uint_32)(length+1));
    png_ptr->current_text[length] = '\0';
    png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = length;
-   png_ptr->current_text_left = length;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
    png_ptr->process_mode = PNG_READ_zTXt_MODE;
 }
 
@@ -978,8 +993,8 @@
             if (text == NULL)
             {
                text = (png_charp)png_malloc(png_ptr,
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out +
-                     key_size + 1);
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
+                     key_size + 1));
                png_memcpy(text + key_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
                png_memcpy(text, key, key_size);
@@ -993,7 +1008,8 @@
 
                tmp = text;
                text = (png_charp)png_malloc(png_ptr, text_size +
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1);
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+                   + 1));
                png_memcpy(text, tmp, text_size);
                png_free(png_ptr, tmp);
                png_memcpy(text + text_size, png_ptr->zbuf,
@@ -1029,9 +1045,8 @@
       png_free(png_ptr, key);
       key = text;
       text += key_size;
-      text_size -= key_size;
 
-      text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
       text_ptr->key = key;
       text_ptr->text = text;
diff --git a/pngread.c b/pngread.c
index 9d83fb7..d1d95c3 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,12 +1,12 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 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, png_voidp error_ptr,
+png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
    png_structp png_ptr;
@@ -58,7 +58,8 @@
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
    png_ptr->zstream.zalloc = png_zalloc;
    png_ptr->zstream.zfree = png_zfree;
    png_ptr->zstream.opaque = (voidpf)png_ptr;
@@ -100,7 +101,8 @@
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
    png_ptr->zstream.zalloc = png_zalloc;
    png_ptr->zstream.zfree = png_zfree;
    png_ptr->zstream.opaque = (voidpf)png_ptr;
@@ -407,14 +409,17 @@
    png_ptr->row_info.channels = png_ptr->channels;
    png_ptr->row_info.bit_depth = png_ptr->bit_depth;
    png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
-   png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
-      (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+   {
+      png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
+         (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+   }
 
    png_read_filter_row(png_ptr, &(png_ptr->row_info),
       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
       (int)(png_ptr->row_buf[0]));
 
-   png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
+   png_buffered_memcpy(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
diff --git a/pngrio.c b/pngrio.c
index 7926b9e..3f950bf 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,12 +1,12 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * This file provides a location for all input.  Users which need
  * special handling are expected to write a function which has the same
@@ -99,7 +99,7 @@
       }
       while (remaining != 0);
    }
-   if (check != length)
+   if ((png_uint_32)check != (png_uint_32)length)
    {
       png_error(png_ptr, "read Error");
    }
diff --git a/pngrtran.c b/pngrtran.c
index 77098af..092e6f8 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,12 +1,12 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * This file contains functions optionally called by an application 
  * in order to tell libpng how to handle data when reading a PNG.
@@ -184,7 +184,7 @@
       int i;
 
       png_ptr->dither_index = (png_bytep)png_malloc(png_ptr,
-         num_palette * sizeof (png_byte));
+         (png_uint_32)(num_palette * sizeof (png_byte)));
       for (i = 0; i < num_palette; i++)
          png_ptr->dither_index[i] = (png_byte)i;
    }
@@ -200,7 +200,8 @@
          png_bytep sort;
 
          /* initialize an array to sort colors */
-         sort = (png_bytep)png_malloc(png_ptr, num_palette * sizeof (png_byte));
+         sort = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette
+            * sizeof (png_byte)));
 
          /* initialize the sort array */
          for (i = 0; i < num_palette; i++)
@@ -243,11 +244,11 @@
                move the others */
             for (i = 0, j = num_palette; i < maximum_colors; i++)
             {
-               if (sort[i] >= maximum_colors)
+               if ((int)sort[i] >= maximum_colors)
                {
                   do
                      j--;
-                  while (sort[j] >= maximum_colors);
+                  while ((int)sort[j] >= maximum_colors);
                   palette[i] = palette[j];
                }
             }
@@ -261,13 +262,13 @@
             for (i = 0, j = num_palette; i < maximum_colors; i++)
             {
                /* only move the colors we need to */
-               if (sort[i] >= maximum_colors)
+               if ((int)sort[i] >= maximum_colors)
                {
                   png_color tmp_color;
 
                   do
                      j--;
-                  while (sort[j] >= maximum_colors);
+                  while ((int)sort[j] >= maximum_colors);
 
                   tmp_color = palette[j];
                   palette[j] = palette[i];
@@ -281,7 +282,7 @@
             /* find closest color for those colors we are not using */
             for (i = 0; i < num_palette; i++)
             {
-               if (png_ptr->dither_index[i] >= maximum_colors)
+               if ((int)png_ptr->dither_index[i] >= maximum_colors)
                {
                   int min_d, k, min_k, d_index;
 
@@ -328,9 +329,9 @@
 
          /* initialize palette index arrays */
          index_to_palette = (png_bytep)png_malloc(png_ptr,
-            num_palette * sizeof (png_byte));
+            (png_uint_32)(num_palette * sizeof (png_byte)));
          palette_to_index = (png_bytep)png_malloc(png_ptr,
-            num_palette * sizeof (png_byte));
+            (png_uint_32)(num_palette * sizeof (png_byte)));
 
          /* initialize the sort array */
          for (i = 0; i < num_palette; i++)
@@ -339,7 +340,8 @@
             palette_to_index[i] = (png_byte)i;
          }
 
-         hash = (png_dsortpp)png_malloc(png_ptr, 769 * sizeof (png_dsortp));
+         hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 * 
+            sizeof (png_dsortp)));
          for (i = 0; i < 769; i++)
             hash[i] = NULL;
 /*         png_memset(hash, 0, 769 * sizeof (png_dsortp)); */
@@ -372,7 +374,8 @@
                   {
                      png_dsortp t;
 
-                     t = (png_dsortp)png_malloc(png_ptr, sizeof (png_dsort));
+                     t = (png_dsortp)png_malloc(png_ptr, (png_uint_32)(sizeof
+                         (png_dsort)));
                      t->next = hash[d];
                      t->left = (png_byte)i;
                      t->right = (png_byte)j;
@@ -389,8 +392,8 @@
 
                   for (p = hash[i]; p; p = p->next)
                   {
-                     if (index_to_palette[p->left] < num_new_palette &&
-                        index_to_palette[p->right] < num_new_palette)
+                     if ((int)index_to_palette[p->left] < num_new_palette &&
+                        (int)index_to_palette[p->right] < num_new_palette)
                      {
                         int j, next_j;
 
@@ -417,7 +420,7 @@
                                  index_to_palette[j])
                                  png_ptr->dither_index[k] =
                                     index_to_palette[next_j];
-                              if (png_ptr->dither_index[k] ==
+                              if ((int)png_ptr->dither_index[k] ==
                                  num_new_palette)
                                  png_ptr->dither_index[k] =
                                     index_to_palette[j];
@@ -488,11 +491,12 @@
       num_entries = ((png_size_t)1 << total_bits);
 
       png_ptr->palette_lookup = (png_bytep )png_malloc(png_ptr,
-         num_entries * sizeof (png_byte));
+         (png_uint_32)(num_entries * sizeof (png_byte)));
 
       png_memset(png_ptr->palette_lookup, 0, num_entries * sizeof (png_byte));
 
-      distance = (png_bytep)png_malloc(png_ptr, num_entries * sizeof(png_byte));
+      distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries *
+         sizeof(png_byte)));
 
       png_memset(distance, 0xff, num_entries * sizeof(png_byte));
 
@@ -527,7 +531,7 @@
                   dmax = ((dm > db) ? dm : db);
                   d = dmax + dt + db;
 
-                  if (d < distance[d_index])
+                  if (d < (int)distance[d_index])
                   {
                      distance[d_index] = (png_byte)d;
                      png_ptr->palette_lookup[d_index] = (png_byte)i;
@@ -656,7 +660,7 @@
            /* invert the alpha channel (in tRNS) unless the pixels are 
               going to be expanded, in which case leave it for later */
               int i;
-              for (i=0; i<png_ptr->num_trans; i++)
+              for (i=0; i<(int)png_ptr->num_trans; i++)
                  png_ptr->trans[i] = 255 - png_ptr->trans[i];
            }
         }
@@ -852,7 +856,7 @@
       back.green = (png_byte)png_ptr->background.green;
       back.blue  = (png_byte)png_ptr->background.blue;
 
-      for (i = 0; i < png_ptr->num_trans; i++)
+      for (i = 0; i < (int)png_ptr->num_trans; i++)
       {
          if (png_ptr->trans[i] == 0)
          {
@@ -995,8 +999,7 @@
    info_ptr->pixel_depth = (png_byte)(info_ptr->channels *
       info_ptr->bit_depth);
 
-   info_ptr->rowbytes = 
-      (png_size_t)((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
+   info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
 }
 
 /* Transform the row.  The order of transformations is significant,
@@ -1085,6 +1088,8 @@
    {
       png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1,
          png_ptr->palette_lookup, png_ptr->dither_index);
+      if(png_ptr->row_info.rowbytes == (png_uint_32)0)
+         png_error(png_ptr, "png_do_dither returned rowbytes=0");
    }
 #endif
 
@@ -1227,7 +1232,7 @@
       }
       row_info->bit_depth = 8;
       row_info->pixel_depth = (png_byte)(8 * row_info->channels);
-      row_info->rowbytes = (png_size_t)row_info->width * row_info->channels;
+      row_info->rowbytes = row_info->width * row_info->channels;
    }
 }
 #endif
@@ -1286,7 +1291,7 @@
          case 2:
          {
             png_bytep bp;
-            png_size_t i;
+            png_uint_32 i;
 
             for (bp = row, i = 0; i < row_info->rowbytes; i++, bp++)
             {
@@ -1299,7 +1304,7 @@
          {
             png_bytep bp;
             png_byte mask;
-            png_size_t i;
+            png_uint_32 i;
 
             mask = (png_byte)(((int)0xf0 >> shift[0]) & (int)0xf0) |
                (png_byte)((int)0xf >> shift[0]);
@@ -1313,11 +1318,11 @@
          case 8:
          {
             png_bytep bp;
-            png_size_t i;
+            png_uint_32 i;
 
             for (bp = row, i = 0; i < row_info->width; i++)
             {
-               for (c = 0; c < row_info->channels; c++, bp++)
+               for (c = 0; c < (int)row_info->channels; c++, bp++)
                {
                   *bp >>= shift[c];
                }
@@ -1331,7 +1336,7 @@
 
             for (bp = row, i = 0; i < row_info->width; i++)
             {
-               for (c = 0; c < row_info->channels; c++, bp += 2)
+               for (c = 0; c < (int)row_info->channels; c++, bp += 2)
                {
                   value = (png_uint_16)((*bp << 8) + *(bp + 1));
                   value >>= shift[c];
@@ -1395,7 +1400,7 @@
       }
       row_info->bit_depth = 8;
       row_info->pixel_depth = (png_byte)(8 * row_info->channels);
-      row_info->rowbytes = (png_size_t)row_info->width * row_info->channels;
+      row_info->rowbytes = row_info->width * row_info->channels;
    }
 }
 #endif
@@ -1604,7 +1609,7 @@
          *(--dp) = (png_byte)filler;
          row_info->channels = 4;
          row_info->pixel_depth = 32;
-         row_info->rowbytes = (png_size_t)row_info->width * 4;
+         row_info->rowbytes = row_info->width * 4;
       }
       /* This changes the data from RGB to XRGB */
       else
@@ -1621,7 +1626,7 @@
          }
          row_info->channels = 4;
          row_info->pixel_depth = 32;
-         row_info->rowbytes = (png_size_t)row_info->width * 4;
+         row_info->rowbytes = row_info->width * 4;
       }
    }
 }
@@ -1715,7 +1720,7 @@
       row_info->color_type |= PNG_COLOR_MASK_COLOR;
       row_info->pixel_depth = (png_byte)(row_info->channels *
          row_info->bit_depth);
-      row_info->rowbytes = (png_size_t)((row_info->width *
+      row_info->rowbytes = ((row_info->width *
          row_info->pixel_depth + 7) >> 3);
    }
 }
@@ -1993,7 +1998,8 @@
                   shift = 7;
                   for (i = 0; i < row_info->width; i++)
                   {
-                     if (((*sp >> shift) & 0x1) == trans_values->gray)
+                     if ((png_uint_16)((*sp >> shift) & 0x1)
+                        == trans_values->gray)
                      {
                         *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
                         *sp |= (png_byte)(background->gray << shift);
@@ -2014,7 +2020,8 @@
                   shift = 6;
                   for (i = 0; i < row_info->width; i++)
                   {
-                     if (((*sp >> shift) & 0x3) == trans_values->gray)
+                     if ((png_uint_16)((*sp >> shift) & 0x3)
+                         == trans_values->gray)
                      {
                         *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
                         *sp |= (png_byte)(background->gray << shift);
@@ -2035,7 +2042,8 @@
                   shift = 4;
                   for (i = 0; i < row_info->width; i++)
                   {
-                     if (((*sp >> shift) & 0xf) == trans_values->gray)
+                     if ((png_uint_16)((*sp >> shift) & 0xf)
+                         == trans_values->gray)
                      {
                         *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
                         *sp |= (png_byte)(background->gray << shift);
@@ -2543,7 +2551,7 @@
          row_info->channels--;
          row_info->pixel_depth = (png_byte)(row_info->channels *
             row_info->bit_depth);
-         row_info->rowbytes = (png_size_t)((row_info->width *
+         row_info->rowbytes = ((row_info->width *
             row_info->pixel_depth + 7) >> 3);
       }
    }
@@ -2824,7 +2832,7 @@
          }
          row_info->bit_depth = 8;
          row_info->pixel_depth = 8;
-         row_info->rowbytes = (png_size_t)row_info->width;
+         row_info->rowbytes = row_info->width;
       }
       switch (row_info->bit_depth)
       {
@@ -2848,7 +2856,7 @@
                }
                row_info->bit_depth = 8;
                row_info->pixel_depth = 32;
-               row_info->rowbytes = (png_size_t)row_info->width * 4;
+               row_info->rowbytes = row_info->width * 4;
                row_info->color_type = 6;
                row_info->channels = 4;
             }
@@ -2866,7 +2874,7 @@
                }
                row_info->bit_depth = 8;
                row_info->pixel_depth = 24;
-               row_info->rowbytes = (png_size_t)row_info->width * 3;
+               row_info->rowbytes = row_info->width * 3;
                row_info->color_type = 2;
                row_info->channels = 3;
             }
@@ -2972,7 +2980,7 @@
             }
             row_info->bit_depth = 8;
             row_info->pixel_depth = 8;
-            row_info->rowbytes = (png_size_t)row_info->width;
+            row_info->rowbytes = row_info->width;
          }
 
          if (trans_value != NULL)
@@ -3015,7 +3023,7 @@
             row_info->channels = 2;
             row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
             row_info->rowbytes =
-               (png_size_t)((row_info->width * row_info->pixel_depth) >> 3);
+               ((row_info->width * row_info->pixel_depth) >> 3);
          }
       }
       else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value)
@@ -3070,7 +3078,7 @@
          row_info->channels = 4;
          row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
          row_info->rowbytes =
-            (png_size_t)((row_info->width * row_info->pixel_depth) >> 3);
+            ((row_info->width * row_info->pixel_depth) >> 3);
       }
    }
 }
@@ -3123,7 +3131,7 @@
          row_info->channels = 1;
          row_info->pixel_depth = row_info->bit_depth;
          row_info->rowbytes =
-            ((row_info->width * row_info->pixel_depth + 7) >> 3);
+             ((row_info->width * row_info->pixel_depth + 7) >> 3);
       }
       else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
          palette_lookup != NULL && row_info->bit_depth == 8)
@@ -3153,7 +3161,7 @@
          row_info->channels = 1;
          row_info->pixel_depth = row_info->bit_depth;
          row_info->rowbytes =
-            (png_size_t)((row_info->width * row_info->pixel_depth + 7) >> 3);
+            ((row_info->width * row_info->pixel_depth + 7) >> 3);
       }
       else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
          dither_lookup && row_info->bit_depth == 8)
@@ -3267,7 +3275,7 @@
       g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
 
       png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
-         num * sizeof (png_uint_16p));
+         (png_uint_32)(num * sizeof (png_uint_16p)));
 
       if ((png_ptr->transformations & PNG_16_TO_8) &&
          !(png_ptr->transformations & PNG_BACKGROUND))
@@ -3278,7 +3286,7 @@
          for (i = 0; i < num; i++)
          {
             png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
-               256 * sizeof (png_uint_16));
+               (png_uint_32)(256 * sizeof (png_uint_16)));
          }
 
          g = 1.0 / g;
@@ -3308,7 +3316,7 @@
          for (i = 0; i < num; i++)
          {
             png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
-               256 * sizeof (png_uint_16));
+               (png_uint_32)(256 * sizeof (png_uint_16)));
 
             ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
             for (j = 0; j < 256; j++)
@@ -3326,12 +3334,12 @@
          g = 1.0 / (png_ptr->gamma);
 
          png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
-            num * sizeof (png_uint_16p ));
+            (png_uint_32)(num * sizeof (png_uint_16p )));
 
          for (i = 0; i < num; i++)
          {
             png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
-               256 * sizeof (png_uint_16));
+               (png_uint_32)(256 * sizeof (png_uint_16)));
 
             ig = (((png_uint_32)i *
                (png_uint_32)png_gamma_shift[shift]) >> 4);
@@ -3345,12 +3353,12 @@
          g = 1.0 / (png_ptr->screen_gamma);
 
          png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
-            num * sizeof (png_uint_16p));
+            (png_uint_32)(num * sizeof (png_uint_16p)));
 
          for (i = 0; i < num; i++)
          {
             png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
-               256 * sizeof (png_uint_16));
+               (png_uint_32)(256 * sizeof (png_uint_16)));
 
             ig = (((png_uint_32)i *
                (png_uint_32)png_gamma_shift[shift]) >> 4);
diff --git a/pngrutil.c b/pngrutil.c
index bd6944a..16e7aab 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,12 +1,12 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 0.99a
+ * libpng 0.99
  * 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
- * January 31, 1998
+ * February 7, 1998
  *
  * This file contains routines which are only called from within
  * libpng itself during the course of reading an image.
@@ -226,7 +226,7 @@
 
    /* set up other useful info */
    png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
-      png_ptr->channels);
+   png_ptr->channels);
    png_ptr->rowbytes = ((png_ptr->width *
       (png_uint_32)png_ptr->pixel_depth + 7) >> 3);
    png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth);
@@ -909,7 +909,7 @@
 
    num = (int)length / 2;
    png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
-      num * sizeof (png_uint_16));
+      (png_uint_32)(num * sizeof (png_uint_16)));
    png_ptr->flags |= PNG_FLAG_FREE_HIST;
    for (i = 0; i < num; i++)
    {
@@ -1097,10 +1097,11 @@
    for (buf = units; *buf != '\0'; buf++);
 
    png_debug(3, "Allocating pCAL parameters array\n");
-   params = (png_charpp)png_malloc(png_ptr, nparams*sizeof(png_charp)) ;
+   params = (png_charpp)png_malloc(png_ptr, (png_uint_32)(nparams
+      *sizeof(png_charp))) ;
 
    /* Get pointers to the start of each parameter string. */
-   for (i = 0; i < nparams; i++)
+   for (i = 0; i < (int)nparams; i++)
    {
       buf++; /* Skip the null string terminator from previous parameter. */
 
@@ -1213,7 +1214,7 @@
    if (text != key + (png_size_t)length)
       text++;
 
-   text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+   text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
    text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
    text_ptr->key = key;
    text_ptr->text = text;
@@ -1303,14 +1304,14 @@
             if (text ==  NULL)
             {
                text_size = key_size + sizeof(msg) + 1;
-               text = (png_charp)png_malloc(png_ptr, text_size);
+               text = (png_charp)png_malloc(png_ptr, (png_uint_32)text_size);
                png_memcpy(text, key, key_size);
             }
 
             text[text_size - 1] = '\0';
 
             /* Copy what we can of the error message into the text chunk */
-            text_size = length - (text - key) - 1;
+            text_size = (png_size_t)length - (text - key) - 1;
             text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
             png_memcpy(text + key_size, msg, text_size + 1);
             break;
@@ -1320,8 +1321,8 @@
             if (text == NULL)
             {
                text = (png_charp)png_malloc(png_ptr,
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out +
-                     key_size + 1);
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+                     + key_size + 1));
                png_memcpy(text + key_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
                png_memcpy(text, key, key_size);
@@ -1334,8 +1335,8 @@
                png_charp tmp;
 
                tmp = text;
-               text = (png_charp)png_malloc(png_ptr, text_size +
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1);
+               text = (png_charp)png_malloc(png_ptr, (png_uint_32)(text_size +
+                  png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
                png_memcpy(text, tmp, text_size);
                png_free(png_ptr, tmp);
                png_memcpy(text + text_size, png_ptr->zbuf,
@@ -1361,7 +1362,6 @@
       png_free(png_ptr, key);
       key = text;
       text += key_size;
-      text_size -= key_size;
    }
    else /* if (comp_type >= PNG_TEXT_COMPRESSION_LAST) */
    {
@@ -1381,7 +1381,7 @@
       png_memcpy(text, msg, text_size + 1);
    }
 
-   text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+   text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
    text_ptr->compression = comp_type;
    text_ptr->key = key;
    text_ptr->text = text;
@@ -1879,6 +1879,7 @@
    png_debug(1, "in png_read_filter_row\n");
    png_debug2(2,"row = %d, filter = %d\n", png_ptr->row_number, filter);
 
+
    switch (filter)
    {
       case PNG_FILTER_VALUE_NONE:
@@ -1992,7 +1993,7 @@
    if (png_ptr->interlaced)
    {
       png_ptr->row_number = 0;
-      png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+      png_buffered_memset(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
       do
       {
          png_ptr->pass++;
@@ -2002,8 +2003,9 @@
             png_pass_inc[png_ptr->pass] - 1 -
             png_pass_start[png_ptr->pass]) /
             png_pass_inc[png_ptr->pass];
-         png_ptr->irowbytes = ((png_ptr->iwidth *
-            png_ptr->pixel_depth + 7) >> 3) + 1;
+            png_ptr->irowbytes = ((png_ptr->iwidth *
+               (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
+
          if (!(png_ptr->transformations & PNG_INTERLACE))
          {
             png_ptr->num_rows = (png_ptr->height +
@@ -2104,8 +2106,12 @@
          png_pass_inc[png_ptr->pass] - 1 -
          png_pass_start[png_ptr->pass]) /
          png_pass_inc[png_ptr->pass];
-      png_ptr->irowbytes = ((png_ptr->iwidth *
-         png_ptr->pixel_depth + 7) >> 3) + 1;
+
+         rowbytes = ((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_error(png_ptr, "Rowbytes overflow in png_read_start_row");
    }
    else
    {
@@ -2194,9 +2200,10 @@
    if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1);
+   png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
+      png_ptr->rowbytes + 1));
 
-   png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+   png_buffered_memset(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
 
    png_debug1(3, "width = %d,\n", png_ptr->width);
    png_debug1(3, "height = %d,\n", png_ptr->height);
diff --git a/pngset.c b/pngset.c
index 502013e..d6db45b 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,12 +1,12 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 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
@@ -84,6 +84,7 @@
    int color_type, int interlace_type, int compression_type,
    int filter_type)
 {
+   int rowbytes_per_pixel;
    png_debug1(1, "in %s storage function\n", "IHDR");
    if (info_ptr == NULL)
       return;
@@ -104,7 +105,16 @@
    if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
       info_ptr->channels++;
    info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
-   info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
+
+   /* check for overflow */
+   rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
+   info_ptr->rowbytes = info_ptr->width * rowbytes_per_pixel;
+   if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+   {
+      png_warning(png_ptr,
+         "Width too large to process image data; rowbytes will overflow.");
+      info_ptr->rowbytes = (png_size_t)0;
+   }
 }
 
 #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
@@ -129,8 +139,8 @@
    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
    png_charp units, png_charpp params)
 {
-   png_size_t length;
-   int i;
+   png_uint_32 length;
+   png_uint_32 i;
 
    png_debug1(1, "in %s storage function\n", "pCAL");
    if (info_ptr == NULL)
@@ -139,7 +149,7 @@
    length = png_strlen(purpose) + 1;
    png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
    info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_purpose, purpose, length);
+   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 
    png_debug(3, "storing X0, X1, type, and nparams in info\n");
    info_ptr->pcal_X0 = X0;
@@ -150,10 +160,10 @@
    length = png_strlen(units) + 1;
    png_debug1(3, "allocating units for info (%d bytes)\n", length);
    info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_units, units, length);
+   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 
    info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
-      (nparams + 1) * sizeof(png_charp));
+      (png_uint_32)((nparams + 1) * sizeof(png_charp)));
    info_ptr->pcal_params[nparams] = NULL;
 
    for (i = 0; i < nparams; i++)
@@ -161,7 +171,7 @@
       length = png_strlen(params[i]) + 1;
       png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
       info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
-      png_memcpy(info_ptr->pcal_params[i], params[i], length);
+      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
 
    info_ptr->valid |= PNG_INFO_pCAL;
@@ -289,7 +299,8 @@
          old_text = info_ptr->text;
          info_ptr->text = (png_textp)png_malloc(png_ptr,
             info_ptr->max_text * sizeof (png_text));
-         png_memcpy(info_ptr->text, old_text, old_max * sizeof(png_text));
+         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
+            sizeof(png_text)));
          png_free(png_ptr, old_text);
       }
       else
@@ -297,7 +308,7 @@
          info_ptr->max_text = num_text + 8;
          info_ptr->num_text = 0;
          info_ptr->text = (png_textp)png_malloc(png_ptr,
-            info_ptr->max_text * sizeof (png_text));
+            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
       }
       png_debug1(3, "allocated %d entries for info_ptr->text\n",
          info_ptr->max_text);
diff --git a/pngtest.c b/pngtest.c
index 5c12f1f..f57f78c 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,12 +1,12 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 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
@@ -284,7 +284,7 @@
       return (NULL);
    }
    if (size == 0)
-      return (NULL);
+      return (png_voidp)(NULL);
 
    /* This calls the library allocator twice, once to get the requested
       buffer and once to get a new free list entry. */
@@ -299,7 +299,7 @@
       pinformation = pinfo;
       /* Make sure the caller isn't assuming zeroed memory. */
       png_memset(pinfo->pointer, 0xdd, pinfo->size);
-      return ((png_voidp)pinfo->pointer);
+      return (png_voidp)(pinfo->pointer);
    }
 }
 
@@ -612,6 +612,7 @@
    png_debug(0, "\nWriting info struct\n");
    png_write_info(write_ptr, write_info_ptr);
 
+   png_debug(0, "\nAllocating row buffer \n");
    row_buf = (png_bytep)png_malloc(read_ptr, 
       png_get_rowbytes(read_ptr, read_info_ptr));
    if (row_buf == NULL)
@@ -623,12 +624,14 @@
       fclose(fpout);
       return (1);
    }
+   png_debug(0, "Writing row data\n");
 
    num_pass = png_set_interlace_handling(read_ptr);
    png_set_interlace_handling(write_ptr);
 
    for (pass = 0; pass < num_pass; pass++)
    {
+      png_debug1(0, "Writing row data for pass %d\n",pass);
       for (y = 0; y < height; y++)
       {
          png_read_rows(read_ptr, (png_bytepp)&row_buf, (png_bytepp)NULL, 1);
@@ -867,5 +870,5 @@
       fprintf(STDERR, "libpng passes test\n");
    else
       fprintf(STDERR, "libpng FAILS test\n");
-   return ((int)(ierror != 0));
+   return (int)(ierror != 0);
 }
diff --git a/pngtrans.c b/pngtrans.c
index 28177d2..fb993db 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 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 #define PNG_INTERNAL
diff --git a/pngwio.c b/pngwio.c
index 2358a02..ec7f76f 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,12 +1,12 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 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 d56cc42..39754d4 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,12 +1,12 @@
    
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 /* get internal access to png.h */
@@ -77,7 +77,7 @@
             info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
          {
             int j;
-            for (j=0; j<info_ptr->num_trans; j++)
+            for (j=0; j<(int)info_ptr->num_trans; j++)
                info_ptr->trans[j] = 255 - info_ptr->trans[j];
          }
 #endif
@@ -230,7 +230,8 @@
 
    if (png_ptr->time_buffer == NULL)
    {
-      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, 29*sizeof(char));
+      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
+         sizeof(char)));
    }
 
 #ifdef USE_FAR_KEYWORD
@@ -320,7 +321,8 @@
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+      (png_uint_32)png_ptr->zbuf_size);
 
    png_set_write_fn(png_ptr, NULL, NULL, NULL);
 
@@ -351,7 +353,8 @@
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+      (png_uint_32)png_ptr->zbuf_size);
    png_set_write_fn(png_ptr, NULL, NULL, NULL);
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -487,6 +490,7 @@
    png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
    png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
       png_ptr->row_info.channels);
+
    png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
@@ -498,7 +502,8 @@
    png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
 
    /* Copy user's row into buffer, leaving room for filter byte. */
-   png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
+   png_buffered_memcpy(png_ptr, png_ptr->row_buf + 1, row,
+      png_ptr->row_info.rowbytes);
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* handle interlacing */
@@ -611,7 +616,7 @@
       if (info_ptr->pcal_params != NULL)
       {
          int i;
-         for (i = 0; i < info_ptr->pcal_nparams; i++)
+         for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
          {
             png_free(png_ptr, info_ptr->pcal_params[i]);
          }
@@ -714,7 +719,7 @@
          if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
-               png_ptr->rowbytes + 1);
+              (png_ptr->rowbytes + 1));
             png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
          }
 
@@ -728,7 +733,7 @@
             else
             {
                png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+                  (png_ptr->rowbytes + 1));
                png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
             }
          }
@@ -743,7 +748,7 @@
             else
             {
                png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+                  (png_ptr->rowbytes + 1));
                png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
             }
          }
@@ -759,7 +764,7 @@
             else
             {
                png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+                  (png_ptr->rowbytes + 1));
                png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
             }
          }
@@ -815,7 +820,7 @@
       if (png_ptr->prev_filters == NULL)
       {
          png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
-            sizeof(png_byte) * num_weights);
+            (png_uint_32)(sizeof(png_byte) * num_weights));
 
          /* To make sure that the weighting starts out fairly */
          for (i = 0; i < num_weights; i++)
@@ -827,10 +832,10 @@
       if (png_ptr->filter_weights == NULL)
       {
          png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
-            sizeof(png_uint_16) * num_weights);
+            (png_uint_32)(sizeof(png_uint_16) * num_weights));
 
          png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
-            sizeof(png_uint_16) * num_weights);
+            (png_uint_32)(sizeof(png_uint_16) * num_weights));
 
          for (i = 0; i < num_weights; i++)
          {
@@ -862,10 +867,10 @@
    if (png_ptr->filter_costs == NULL)
    {
       png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
-         sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST);
+         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
       png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
-         sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST);
+         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
       {
diff --git a/pngwtran.c b/pngwtran.c
index 97886ba..b66d192 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,12 +1,12 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 #define PNG_INTERNAL
diff --git a/pngwutil.c b/pngwutil.c
index 22f7797..c1ccf19 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,12 +1,12 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 0.99a
+ * libpng 0.99c
  * 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
- * January 31, 1998
+ * February 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -375,7 +375,7 @@
    /* make sure we don't depend upon the order of PNG_COLOR_8 */
    if (color_type & PNG_COLOR_MASK_COLOR)
    {
-      int maxbits;
+      png_byte maxbits;
 
       maxbits = color_type==PNG_COLOR_TYPE_PALETTE ? 8:png_ptr->usr_bit_depth;
       if (sbit->red == 0 || sbit->red > maxbits || 
@@ -486,7 +486,7 @@
    png_debug(1, "in png_write_tRNS\n");
    if (color_type == PNG_COLOR_TYPE_PALETTE)
    {
-      if (num_trans <= 0 || num_trans > png_ptr->num_palette)
+      if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
       {
          png_warning(png_ptr,"Invalid number of transparent colors specified");
          return;
@@ -551,13 +551,13 @@
 #if defined(PNG_WRITE_hIST_SUPPORTED)
 /* write the histogram */
 void
-png_write_hIST(png_structp png_ptr, png_uint_16p hist, png_uint_32 num_hist)
+png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
 {
-   png_uint_32 i;
+   int i;
    png_byte buf[3];
 
    png_debug(1, "in png_write_hIST\n");
-   if (num_hist > png_ptr->num_palette)
+   if (num_hist > (int)png_ptr->num_palette)
    {
       png_debug2(3, "num_hist = %d, num_palette = %d\n", num_hist,
          png_ptr->num_palette);
@@ -565,7 +565,7 @@
       return;
    }
 
-   png_write_chunk_start(png_ptr, png_hIST, num_hist * 2);
+   png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
    for (i = 0; i < num_hist; i++)
    {
       png_save_uint_16(buf, hist[i]);
@@ -604,7 +604,7 @@
 
    png_debug1(2, "Keyword to be checked is '%s'\n", key);
 
-   *new_key = (png_charp)png_malloc(png_ptr, key_len + 1);
+   *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 1));
 
    /* Replace non-printing characters with a blank and print a warning */
    for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
@@ -815,18 +815,18 @@
 
                old_ptr = output_ptr;
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charpp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
                png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
                png_free(png_ptr, old_ptr);
             }
             else
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charp)));
          }
 
          /* save the data */
          output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
-            png_ptr->zbuf_size);
+            (png_uint_32)png_ptr->zbuf_size);
          png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
             png_ptr->zbuf_size);
          num_output_ptr++;
@@ -869,18 +869,18 @@
                old_ptr = output_ptr;
                /* This could be optimized to realloc() */
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charpp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
                png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
                png_free(png_ptr, old_ptr);
             }
             else
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charp)));
          }
 
          /* save off the data */
          output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
-            png_ptr->zbuf_size);
+            (png_uint_32)png_ptr->zbuf_size);
          png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
             png_ptr->zbuf_size);
          num_output_ptr++;
@@ -968,7 +968,8 @@
    png_debug1(3, "pCAL units length = %d\n", units_len);
    total_len = purpose_len + units_len + 10;
 
-   params_len = (png_uint_32p)png_malloc(png_ptr, nparams*sizeof(png_uint_32));
+   params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
+      *sizeof(png_uint_32)));
 
    /* Find the length of each parameter, making sure we don't count the
       null terminator for the last parameter. */
@@ -980,7 +981,7 @@
    }
 
    png_debug1(3, "pCAL total length = %d\n", total_len);
-   png_write_chunk_start(png_ptr, png_pCAL, total_len);
+   png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len);
    png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
    png_save_int_32(buf, X0);
    png_save_int_32(buf + 4, X1);
@@ -1063,14 +1064,14 @@
                             png_ptr->usr_bit_depth + 7) >> 3) + 1);
 
    /* set up row buffer */
-   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size);
+   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
    png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
 
    /* set up filtering buffer, if using this filter */
    if (png_ptr->do_filter & PNG_FILTER_SUB)
    {
       png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
-         png_ptr->rowbytes + 1);
+         (png_ptr->rowbytes + 1));
       png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
    }
 
@@ -1078,27 +1079,27 @@
    if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
    {
      /* set up previous row buffer */
-      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, buf_size);
+      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
       png_memset(png_ptr->prev_row, 0, buf_size);
 
       if (png_ptr->do_filter & PNG_FILTER_UP)
       {
          png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+            (png_ptr->rowbytes + 1));
          png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
       }
 
       if (png_ptr->do_filter & PNG_FILTER_AVG)
       {
-         png_ptr->avg_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+         png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
+            (png_ptr->rowbytes + 1));
          png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
       }
 
       if (png_ptr->do_filter & PNG_FILTER_PAETH)
       {
          png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+            (png_ptr->rowbytes + 1));
          png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
       }
    }
@@ -1372,9 +1373,8 @@
          png_pass_inc[pass] - 1 -
          png_pass_start[pass]) /
          png_pass_inc[pass];
-      row_info->rowbytes = ((row_info->width *
-         row_info->pixel_depth + 7) >> 3);
-
+         row_info->rowbytes = ((row_info->width *
+            row_info->pixel_depth + 7) >> 3);
    }
 }
 #endif
@@ -1421,7 +1421,7 @@
    {
       png_bytep rp;
       png_uint_32 sum = 0;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
       for (i = 0, rp = row_buf + 1; i < row_info->rowbytes; i++, rp++)
@@ -1438,7 +1438,7 @@
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
 
          /* Reduce the sum if we match any of the previous rows */
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_NONE)
             {
@@ -1472,7 +1472,7 @@
    {
       png_bytep rp, dp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1486,7 +1486,7 @@
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
             {
@@ -1516,7 +1516,8 @@
 
          sum += (v < 128) ? v : 256 - v;
       }
-      for (lp = row_buf + 1; i < row_info->rowbytes; i++, rp++, lp++, dp++)
+      for (lp = row_buf + 1; i < row_info->rowbytes;
+         i++, rp++, lp++, dp++)
       {
          v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
 
@@ -1533,7 +1534,7 @@
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
             {
@@ -1568,7 +1569,7 @@
    {
       png_bytep rp, dp, pp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1578,7 +1579,7 @@
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_UP)
             {
@@ -1602,7 +1603,8 @@
 #endif
 
       for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
-           pp = prev_row + 1; i < row_info->rowbytes; i++, rp++, pp++, dp++)
+           pp = prev_row + 1; i < row_info->rowbytes;
+           i++, rp++, pp++, dp++)
       {
          v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
 
@@ -1619,7 +1621,7 @@
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_UP)
             {
@@ -1654,7 +1656,7 @@
    {
       png_bytep rp, dp, pp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1664,7 +1666,7 @@
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
          {
             if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_AVG)
             {
@@ -1747,7 +1749,7 @@
    {
       png_bytep rp, dp, pp, cp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -1781,7 +1783,7 @@
 #endif
 
       for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
-           pp = prev_row + 1; i < bpp; i++, rp++, pp++, dp++)
+           pp = prev_row + 1; (unsigned)i < bpp; i++, rp++, pp++, dp++)
       {
          v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
 
@@ -1859,9 +1861,9 @@
    /* Save the type of filter we picked this time for future calculations */
    if (png_ptr->num_prev_filters > 0)
    {
-      png_byte i;
+      int i;
 
-      for (i = 1; i < png_ptr->num_prev_filters; i++)
+      for (i = 1; i < (int)png_ptr->num_prev_filters; i++)
       {
          png_ptr->prev_filters[i] = png_ptr->prev_filters[i - 1];
       }
@@ -1930,4 +1932,3 @@
    }
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 }
-
diff --git a/synopsis.txt b/synopsis.txt
new file mode 100644
index 0000000..3aae42e
--- /dev/null
+++ b/synopsis.txt
@@ -0,0 +1,687 @@
+Synopsis, for man pages:
+
+void *far_to_near (png_structp png_ptr,png_voidp ptr,int
+check);
+
+png_voidp png_buffered_memcpy (png_structp png_ptr, png_voidp
+s1, png_voidp s2, png_uint_32 size);
+
+png_voidp png_buffered_memset (png_structp png_ptr, png_voidp
+s1, int value, png_uint_32 size);
+
+void png_build_gamma_table (png_structp png_ptr);
+
+void png_build_grayscale_palette (int bit_depth, png_colorp
+palette);
+
+void png_calculate_crc (png_structp png_ptr, png_bytep ptr,
+png_size_t length);
+
+void png_check_chunk_name (png_structp png_ptr, png_bytep
+chunk_name);
+
+png_size_t png_check_keyword (png_structp png_ptr, png_charp
+key, png_charpp new_key);
+
+int png_check_sig (png_bytep sig, int num);
+
+void png_chunk_error (png_structp png_ptr, png_const_charp
+error);
+
+void png_chunk_warning (png_structp png_ptr, png_const_charp
+message);
+
+void png_combine_row (png_structp png_ptr, png_bytep row, int
+mask);
+
+void png_convert_from_struct_tm (png_timep ptime, struct tm FAR
+* ttime);
+
+void png_convert_from_time_t (png_timep ptime, time_t ttime);
+
+png_charp png_convert_to_rfc1123) (png_structp png_ptr,
+png_timep ptime);
+
+void png_correct_palette (png_structp png_ptr, png_colorp
+palette, int num_palette);
+
+int png_crc_error (png_structp png_ptr);
+
+int png_crc_finish (png_structp png_ptr, png_uint_32 skip);
+
+void png_crc_read (png_structp png_ptr, png_bytep buf,
+png_size_t length);
+
+png_infop png_create_info_struct) (png_structp png_ptr);
+
+png_structp png_create_read_struct) (png_const_charp
+user_png_ver, voidp error_ptr, png_error_ptr error_fn,
+png_error_ptr warn_fn);
+
+png_voidp png_create_struct (int type);
+
+png_structp png_create_write_struct) (png_const_charp
+user_png_ver, voidp error_ptr, png_error_ptr error_fn,
+png_error_ptr warn_fn);
+
+void png_debug_free (png_structp png_ptr, png_voidp ptr);
+
+png_voidp png_debug_malloc (png_structp png_ptr, png_uint_32
+size);
+
+void png_destroy_info_struct (png_structp png_ptr, png_infopp
+info_ptr_ptr);
+
+void png_destroy_read_struct (png_structpp png_ptr_ptr,
+png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr);
+
+void png_destroy_struct (png_voidp struct_ptr);
+
+void png_destroy_write_struct (png_structpp png_ptr_ptr,
+png_infopp info_ptr_ptr);
+
+void png_do_background (png_row_infop row_info, png_bytep row,
+png_color_16p trans_values, png_color_16p background,
+png_color_16p background_1, png_bytep gamma_table, png_bytep
+gamma_from_1, png_bytep gamma_to_1, png_uint_16pp gamma_16,
+png_uint_16pp gamma_16_from_1, png_uint_16pp gamma_16_to_1, int
+gamma_shift);
+
+void png_do_bgr (png_row_infop row_info, png_bytep row);
+
+void png_do_chop (png_row_infop row_info, png_bytep row);
+
+void png_do_dither (png_row_infop row_info, png_bytep row,
+png_bytep palette_lookup, png_bytep dither_lookup);
+
+void png_do_expand (png_row_infop row_info, png_bytep row,
+png_color_16p trans_value);
+
+void png_do_expand_palette (png_row_infop row_info, png_bytep
+row, png_colorp palette, png_bytep trans, int num_trans);
+
+void png_do_gamma (png_row_infop row_info, png_bytep row,
+png_bytep gamma_table, png_uint_16pp gamma_16_table, int
+gamma_shift);
+
+void png_do_gray_to_rgb (png_row_infop row_info, png_bytep
+row);
+
+void png_do_invert (png_row_infop row_info, png_bytep row);
+
+void png_do_pack (png_row_infop row_info, png_bytep row,
+png_uint_32 bit_depth);
+
+void png_do_packswap (png_row_infop row_info, png_bytep row);
+
+void png_do_read_filler (png_row_infop row_info, png_bytep row,
+png_uint_32 filler, png_uint_32 flags);
+
+void png_do_read_interlace (png_row_infop row_info, png_bytep
+row, int pass, png_uint_32 transformations);
+
+void png_do_read_invert_alpha (png_row_infop row_info,
+png_bytep row);
+
+void png_do_read_swap_alpha (png_row_infop row_info, png_bytep
+row);
+
+void png_do_read_transformations (png_structp png_ptr);
+
+void png_do_rgb_to_gray (png_row_infop row_info, png_bytep
+row);
+
+void png_do_shift (png_row_infop row_info, png_bytep row,
+png_color_8p bit_depth);
+
+void png_do_strip_filler (png_row_infop row_info, png_bytep
+row, png_uint_32 flags);
+
+void png_do_swap (png_row_infop row_info, png_bytep row);
+
+void png_do_unpack (png_row_infop row_info, png_bytep row);
+
+void png_do_unshift (png_row_infop row_info, png_bytep row,
+png_color_8p sig_bits);
+
+void png_do_write_interlace (png_row_infop row_info, png_bytep
+row, int pass);
+
+void png_do_write_invert_alpha (png_row_infop row_info,
+png_bytep row);
+
+void png_do_write_swap_alpha (png_row_infop row_info, png_bytep
+row);
+
+void png_do_write_transformations (png_structp png_ptr);
+
+void png_error (png_structp png_ptr, png_const_charp error);
+
+void png_flush (png_structp png_ptr);
+
+void png_free (png_structp png_ptr, png_voidp ptr);
+
+png_byte png_get_bit_depth (png_structp png_ptr, png_infop
+info_ptr);
+
+png_uint_32 png_get_bKGD (png_structp png_ptr, png_infop
+info_ptr, png_color_16p *background);
+
+png_byte png_get_channels (png_structp png_ptr, png_infop
+info_ptr);
+
+png_uint_32 png_get_cHRM (png_structp png_ptr, png_infop
+info_ptr, double *white_x, double *white_y, double *red_x,
+double *red_y, double *green_x, double *green_y, double
+*blue_x, double *blue_y);
+
+png_byte png_get_color_type (png_structp png_ptr, png_infop
+info_ptr);
+
+png_byte png_get_compression_type (png_structp png_ptr,
+png_infop info_ptr);
+
+png_voidp png_get_error_ptr (png_structp png_ptr);
+
+png_byte png_get_filter_type (png_structp png_ptr, png_infop
+info_ptr);
+
+png_uint_32 png_get_gAMA (png_structp png_ptr, png_infop
+info_ptr, double *file_gamma);
+
+png_uint_32 png_get_hIST (png_structp png_ptr, png_infop
+info_ptr, png_uint_16p *hist);
+
+png_uint_32 png_get_image_height (png_structp png_ptr,
+png_infop info_ptr);
+
+png_uint_32 png_get_image_width (png_structp png_ptr, png_infop
+info_ptr);
+
+png_int_32 png_get_int_32 (png_bytep buf);
+
+png_byte png_get_interlace_type (png_structp png_ptr, png_infop
+info_ptr);
+
+png_voidp png_get_io_ptr (png_structp png_ptr);
+
+png_uint_32 png_get_IHDR (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 *width, png_uint_32 *height, int
+*bit_depth, int *color_type, int *interlace_type, int
+*compression_type, int *filter_type);
+
+png_uint_32 png_get_oFFs (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, int
+*unit_type);
+
+png_uint_32 png_get_pCAL (png_structp png_ptr, png_infop
+info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
+int *type, int *nparams, png_charp *units, png_charpp *params);
+
+png_uint_32 png_get_pHYs (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int
+*unit_type);
+
+float png_get_pixel_aspect_ratio (png_structp png_ptr,
+png_infop info_ptr);
+
+png_uint_32 png_get_pixels_per_meter (png_structp png_ptr,
+png_infop info_ptr);
+
+png_voidp png_get_progressive_ptr (png_structp png_ptr);
+
+png_uint_32 png_get_PLTE (png_structp png_ptr, png_infop
+info_ptr, png_colorp *palette, int *num_palette);
+
+png_uint_32 png_get_rowbytes (png_structp png_ptr, png_infop
+info_ptr);
+
+png_uint_32 png_get_sBIT (png_structp png_ptr, png_infop
+info_ptr, png_color_8p *sig_bit);
+
+png_bytep png_get_signature (png_structp png_ptr, png_infop
+info_ptr);
+
+png_uint_32 png_get_sRGB (png_structp png_ptr, png_infop
+info_ptr, int *intent);
+
+png_uint_32 png_get_text (png_structp png_ptr, png_infop
+info_ptr, png_textp *text_ptr, int *num_text);
+
+png_uint_32 png_get_tIME (png_structp png_ptr, png_infop
+info_ptr, png_timep *mod_time);
+
+png_uint_32 png_get_tRNS (png_structp png_ptr, png_infop
+info_ptr, png_bytep *trans, int *num_trans, png_color_16p
+*trans_values);
+
+png_uint_16 png_get_uint_16 (png_bytep buf);
+
+png_uint_32 png_get_uint_32 (png_bytep buf);
+
+png_uint_32 png_get_valid (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 flag);
+
+png_uint_32 png_get_x_offset_microns (png_structp png_ptr,
+png_infop info_ptr);
+
+png_uint_32 png_get_x_offset_pixels (png_structp png_ptr,
+png_infop info_ptr);
+
+png_uint_32 png_get_y_offset_microns (png_structp png_ptr,
+png_infop info_ptr);
+
+png_uint_32 png_get_y_offset_pixels (png_structp png_ptr,
+png_infop info_ptr);
+
+void png_handle_bKGD (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_cHRM (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_gAMA (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_hIST (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_IEND (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_IHDR (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_oFFs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_pCAL (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_pHYs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_PLTE (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_sBIT (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_sRGB (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tEXt (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tIME (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tRNS (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_unknown (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_handle_zTXt (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_info_destroy (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_info_init (png_infop info_ptr);
+
+void png_init_io (png_structp png_ptr, FILE *fp);
+
+void png_init_read_transformations (png_structp png_ptr);
+
+png_voidp png_malloc (png_structp png_ptr, png_uint_32 size);
+
+void png_process_data (png_structp png_ptr, png_infop info_ptr,
+png_bytep buffer, png_size_t buffer_size);
+
+void png_process_IDAT_data (png_structp png_ptr, png_bytep
+buffer, png_size_t buffer_length);
+
+void png_process_some_data (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_progressive_combine_row (png_structp png_ptr,
+png_bytep old_row, png_bytep new_row);
+
+void png_push_check_crc (png_structp png_ptr);
+
+void png_push_crc_finish (png_structp png_ptr);
+
+void png_push_crc_skip (png_structp png_ptr, png_uint_32
+length);
+
+void png_push_fill_buffer (png_structp png_ptr, png_bytep
+buffer, png_size_t length);
+
+void png_push_handle_tEXt (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_handle_unknown (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_handle_zTXt (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_have_end (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_have_info (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_have_row (png_structp png_ptr, png_bytep row);
+
+void png_push_process_row (png_structp png_ptr);
+
+void png_push_read_chunk (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_end (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_IDAT (png_structp png_ptr);
+
+void png_push_read_sig (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_tEXt (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_zTXt (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_restore_buffer (png_structp png_ptr, png_bytep
+buffer, png_size_t buffer_length);
+
+void png_push_save_buffer (png_structp png_ptr);
+
+void png_read_data (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_read_destroy (png_structp png_ptr, png_infop info_ptr,
+png_infop end_info_ptr);
+
+void png_read_end (png_structp png_ptr, png_infop info_ptr);
+
+void png_read_filter_row (png_structp png_ptr, png_row_infop
+row_info, png_bytep row, png_bytep prev_row, int filter);
+
+void png_read_finish_row (png_structp png_ptr);
+
+void png_read_image (png_structp png_ptr, png_bytepp image);
+
+void png_read_info (png_structp png_ptr, png_infop info_ptr);
+
+void png_read_init (png_structp png_ptr);
+
+void png_read_push_finish_row (png_structp png_ptr);
+
+void png_read_row (png_structp png_ptr, png_bytep row,
+png_bytep display_row);
+
+void png_read_rows (png_structp png_ptr, png_bytepp row,
+png_bytepp display_row, png_uint_32 num_rows);
+
+void png_read_start_row (png_structp png_ptr);
+
+void png_read_transform_info (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_read_update_info (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_reset_crc (png_structp png_ptr);
+
+void png_save_int_32 (png_bytep buf, png_int_32 i);
+
+void png_save_uint_16 (png_bytep buf, unsigned int i);
+
+void png_save_uint_32 (png_bytep buf, png_uint_32 i);
+
+void png_set_background (png_structp png_ptr, png_color_16p
+background_color, int background_gamma_code, int need_expand,
+double background_gamma);
+
+void png_set_bgr (png_structp png_ptr);
+
+void png_set_bKGD (png_structp png_ptr, png_infop info_ptr,
+png_color_16p background);
+
+void png_set_cHRM (png_structp png_ptr, png_infop info_ptr,
+double white_x, double white_y, double red_x, double red_y,
+double green_x, double green_y, double blue_x, double blue_y);
+
+void png_set_compression_level (png_structp png_ptr, int
+level);
+
+void png_set_compression_mem_level) (png_structp png_ptr, int
+mem_level);
+
+void png_set_compression_method (png_structp png_ptr, int
+method);
+
+void png_set_compression_strategy) (png_structp png_ptr, int
+strategy);
+
+void png_set_compression_window_bits) (png_structp png_ptr, int
+window_bits);
+
+void png_set_crc_action (png_structp png_ptr, int crit_action,
+int ancil_action);
+
+void png_set_dither (png_structp png_ptr, png_colorp palette,
+int num_palette, int maximum_colors, png_uint_16p histogram,
+int full_dither);
+
+void png_set_error_fn (png_structp png_ptr, png_voidp
+error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn);
+
+void png_set_expand (png_structp png_ptr);
+
+void png_set_filler (png_structp png_ptr, png_uint_32 filler,
+int flags);
+
+void png_set_filter (png_structp png_ptr, int method, int
+filters);
+
+void png_set_filter_heuristics (png_structp png_ptr, int
+heuristic_method, int num_weights, png_doublep filter_weights,
+png_doublep filter_costs);
+
+void png_set_flush (png_structp png_ptr, int nrows);
+
+void png_set_gamma (png_structp png_ptr, double screen_gamma,
+double default_file_gamma);
+
+void png_set_gAMA (png_structp png_ptr, png_infop info_ptr,
+double file_gamma);
+
+void png_set_gray_to_rgb (png_structp png_ptr);
+
+void png_set_hIST (png_structp png_ptr, png_infop info_ptr,
+png_uint_16p hist);
+
+int png_set_interlace_handling (png_structp png_ptr);
+
+void png_set_invert_alpha (png_structp png_ptr);
+
+void png_set_invert_mono (png_structp png_ptr);
+
+void png_set_IHDR (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 width, png_uint_32 height, int bit_depth, int
+color_type, int interlace_type, int compression_type, int
+filter_type);
+
+void png_set_oFFs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 offset_x, png_uint_32 offset_y, int unit_type);
+
+void png_set_packing (png_structp png_ptr);
+
+void png_set_packswap (png_structp png_ptr);
+
+void png_set_pCAL (png_structp png_ptr, png_infop info_ptr,
+png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int
+nparams, png_charp units, png_charpp params);
+
+void png_set_pHYs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 res_x, png_uint_32 res_y, int unit_type);
+
+void png_set_progressive_read_fn (png_structp png_ptr,
+png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
+png_progressive_row_ptr row_fn, png_progressive_end_ptr
+end_fn);
+
+void png_set_PLTE (png_structp png_ptr, png_infop info_ptr,
+png_colorp palette, int num_palette);
+
+void png_set_read_fn (png_structp png_ptr, png_voidp io_ptr,
+png_rw_ptr read_data_fn);
+
+void png_set_rgb_to_gray (png_structp png_ptr);
+
+void png_set_sBIT (png_structp png_ptr, png_infop info_ptr,
+png_color_8p sig_bit);
+
+void png_set_shift (png_structp png_ptr, png_color_8p
+true_bits);
+
+void png_set_sig_bytes (png_structp png_ptr, int num_bytes);
+
+void png_set_sRGB (png_structp png_ptr, png_infop info_ptr, int
+intent);
+
+void png_set_sRGB_gAMA_and_cHRM (png_structp png_ptr, png_infop
+info_ptr, int intent);
+
+void png_set_strip_16 (png_structp png_ptr);
+
+void png_set_strip_alpha (png_structp png_ptr);
+
+void png_set_swap (png_structp png_ptr);
+
+void png_set_swap_alpha (png_structp png_ptr);
+
+void png_set_text (png_structp png_ptr, png_infop info_ptr,
+png_textp text_ptr, int num_text);
+
+void png_set_tIME (png_structp png_ptr, png_infop info_ptr,
+png_timep mod_time);
+
+void png_set_tRNS (png_structp png_ptr, png_infop info_ptr,
+png_bytep trans, int num_trans, png_color_16p trans_values);
+
+void png_set_write_fn (png_structp png_ptr, png_voidp io_ptr,
+png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn);
+
+int png_sig_cmp (png_bytep sig, png_size_t start, png_size_t
+num_to_check);
+
+void png_start_read_image (png_structp png_ptr);
+
+void png_warning (png_structp png_ptr, png_const_charp
+message);
+
+void png_write_bKGD (png_structp png_ptr, png_color_16p values,
+int color_type);
+
+void png_write_chunk (png_structp png_ptr, png_bytep
+chunk_name, png_bytep data, png_size_t length);
+
+void png_write_chunk_data (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_write_chunk_end (png_structp png_ptr);
+
+void png_write_chunk_start (png_structp png_ptr, png_bytep
+chunk_name, png_uint_32 length);
+
+void png_write_cHRM (png_structp png_ptr, double white_x,
+double white_y, double red_x, double red_y, double green_x,
+double green_y, double blue_x, double blue_y);
+
+void png_write_data (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_write_destroy (png_structp png_ptr);
+
+void png_write_destroy_info (png_infop info_ptr);
+
+void png_write_end (png_structp png_ptr, png_infop info_ptr);
+
+void png_write_filtered_row (png_structp png_ptr, png_bytep
+filtered_row);
+
+void png_write_find_filter (png_structp png_ptr, png_row_infop
+row_info);
+
+void png_write_finish_row (png_structp png_ptr);
+
+void png_write_flush (png_structp png_ptr);
+
+void png_write_gAMA (png_structp png_ptr, double file_gamma);
+
+void png_write_hIST (png_structp png_ptr, png_uint_16p hist,
+int num_hist);
+
+void png_write_image (png_structp png_ptr, png_bytepp image);
+
+void png_write_info (png_structp png_ptr, png_infop info_ptr);
+
+void png_write_init (png_structp png_ptr);
+
+void png_write_IDAT (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_write_IEND (png_structp png_ptr);
+
+void png_write_IHDR (png_structp png_ptr, png_uint_32 width,
+png_uint_32 height, int bit_depth, int color_type, int
+compression_type, int filter_type, int interlace_type);
+
+void png_write_oFFs (png_structp png_ptr, png_uint_32 x_offset,
+png_uint_32 y_offset, int unit_type);
+
+void png_write_pCAL (png_structp png_ptr, png_charp purpose,
+png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp
+units, png_charpp params);
+
+void png_write_pHYs (png_structp png_ptr, png_uint_32
+x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int
+unit_type);
+
+void png_write_PLTE (png_structp png_ptr, png_colorp palette,
+png_uint_32 num_pal);
+
+void png_write_row (png_structp png_ptr, png_bytep row);
+
+void png_write_rows (png_structp png_ptr, png_bytepp row,
+png_uint_32 num_rows);
+
+void png_write_sBIT (png_structp png_ptr, png_color_8p sbit,
+int color_type);
+
+void png_write_sig (png_structp png_ptr);
+
+void png_write_sRGB (png_structp png_ptr, int intent);
+
+void png_write_start_row (png_structp png_ptr);
+
+void png_write_tEXt (png_structp png_ptr, png_charp key,
+png_charp text, png_size_t text_len);
+
+void png_write_tIME (png_structp png_ptr, png_timep mod_time);
+
+void png_write_tRNS (png_structp png_ptr, png_bytep trans,
+png_color_16p values, int number, int color_type);
+
+void png_write_zTXt (png_structp png_ptr, png_charp key,
+png_charp text, png_size_t text_len, int compression);
+
+voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size);
+
+void png_zfree (voidpf png_ptr, voidpf ptr);
+