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Imported from libpng-0.99c.tar

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This commit is contained in:
Glenn Randers-Pehrson 1998-02-07 10:20:57 -06:00
parent b212002101
commit 0f881d62b3
26 changed files with 1197 additions and 239 deletions
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13
CHANGES
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@ -214,5 +214,14 @@ version 0.99 [January 30, 1998]
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.

2
README
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@ -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.]

102
libpng.3 Normal file
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@ -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

6
libpng.txt
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@ -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 @@ Libpng was written as a companion to the PNG specification, as a way
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/>.

0
makefile.elf → makefile.lnx
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2
makefile.msc
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@ -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

44
png.5 Normal file
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@ -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

8
png.c
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@ -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_info_destroy(png_structp png_ptr, png_infop info_ptr)
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]);
}

40
png.h
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@ -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 @@ typedef struct png_info_struct
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 png_info FAR * FAR * png_infopp;
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 @@ struct png_struct_def
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 @@ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
/* 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 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#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 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
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 @@ PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
#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)

6
pngconf.h
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@ -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

6
pngerror.c
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@ -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 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
}
if (message == NULL)
buffer[iout++] = 0;
buffer[iout] = 0;
else {
buffer[iout++] = ':';
buffer[iout++] = ' ';

34
pngget.c
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@ -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_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
{
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 @@ png_get_channels(png_structp png_ptr, png_infop info_ptr)
if (info_ptr != NULL)
return(info_ptr->channels);
else
return(0);
return (0);
}
png_bytep
@ -218,7 +218,7 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)
if (info_ptr != NULL)
return(info_ptr->signature);
else
return(NULL);
return (NULL);
}
#if defined(PNG_READ_bKGD_SUPPORTED)
@ -322,6 +322,10 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
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 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
*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);

53
pngmem.c
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@ -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 @@ png_destroy_struct(png_voidp struct_ptr)
{
#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_voidp
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 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
#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);
}
}

57
pngpread.c
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@ -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 @@ png_push_save_buffer(png_structp png_ptr)
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_push_read_IDAT(png_structp png_ptr)
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_push_read_IDAT(png_structp png_ptr)
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_push_process_row(png_structp png_ptr)
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_push_process_row(png_structp png_ptr)
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 @@ png_read_push_finish_row(png_structp png_ptr)
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_read_push_finish_row(png_structp png_ptr)
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 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
}
#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 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
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 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
}
#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 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
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 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
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_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
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;

21
pngread.c
View File

@ -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 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
/* 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 @@ png_read_init(png_structp png_ptr)
/* 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_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
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);

6
pngrio.c
View File

@ -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 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
}
while (remaining != 0);
}
if (check != length)
if ((png_uint_32)check != (png_uint_32)length)
{
png_error(png_ptr, "read Error");
}

112
pngrtran.c
View File

@ -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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
/* 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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
/* 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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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_set_dither(png_structp png_ptr, png_colorp palette,
{
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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 @@ png_init_read_transformations(png_structp png_ptr)
/* 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 @@ png_init_read_transformations(png_structp png_ptr)
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 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
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_read_transformations(png_structp png_ptr)
{
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 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
}
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 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
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_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
{
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 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
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 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
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 @@ png_do_chop(png_row_infop row_info, png_bytep row)
}
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 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
*(--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 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
}
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 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
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 @@ png_do_background(png_row_infop row_info, png_bytep row,
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 @@ png_do_background(png_row_infop row_info, png_bytep row,
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 @@ png_do_background(png_row_infop row_info, png_bytep row,
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 @@ png_do_background(png_row_infop row_info, png_bytep row,
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 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
}
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 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
}
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 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
}
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 @@ png_do_expand(png_row_infop row_info, png_bytep row,
}
row_info->bit_depth = 8;
row_info->pixel_depth = 8;
row_info->rowbytes = (png_size_t)