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Glenn Randers-Pehrson 1998-01-30 21:45:12 -06:00
parent c4a2ae6cac
commit 46f61e2398
25 changed files with 856 additions and 187 deletions
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13
CHANGES
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@ -200,3 +200,16 @@ version 0.98 [January, 1998]
PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent) added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
changed srgb_intent from png_byte to int to avoid compiler bugs changed srgb_intent from png_byte to int to avoid compiler bugs
version 0.99 [January, 1998]
free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
fixed a longstanding "packswap" bug in pngtrans.c
fixed some inconsistencies in pngconf.h that prevented compiling with
PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
changed recommendation about file_gamma for PC images to .50 from .51 in
example.c and libpng.txt, and changed file_gamma for sRGB images to .45
added a number of functions to access information from the png structure
png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
added TARGET_MACOS similar to zlib-1.0.8
define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
added type casting to all png_malloc() function calls

6
README
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@ -1,4 +1,4 @@
[NOTE: this is still beta version 0.97d; the text below has already [NOTE: this is still beta version 0.99; the text below has already
been updated in anticipation of the imminent 1.0 release.] been updated in anticipation of the imminent 1.0 release.]
@ -99,11 +99,11 @@ fix. Please mention "libpng" somewhere in the subject line. Thanks.
This release was created and will be supported by myself (of course This release was created and will be supported by myself (of course
based in a large way on Guy's and Andreas' earlier work), and the PNG group. based in a large way on Guy's and Andreas' earlier work), and the PNG group.
adilger@enel.ucalgary.ca randeg@alumni.rpi.edu
png-implement@dworkin.wustl.edu png-implement@dworkin.wustl.edu
You can't reach Guy, the original libpng author, at the addresses You can't reach Guy, the original libpng author, at the addresses
given in previous versions of this document. He will read mail given in previous versions of this document. He and Andreas will read mail
addressed to the png-implement list, however. addressed to the png-implement list, however.
Please do not send general questions about PNG. Send them to Please do not send general questions about PNG. Send them to

2
TODO
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@ -5,7 +5,7 @@ improved dithering
multi-lingual error and warning message support multi-lingual error and warning message support
sPLT chunk handling sPLT chunk handling
cHRM transformation cHRM transformation
complete sRGB transformation (presently it simply uses gamma=0.51) complete sRGB transformation (presently it simply uses gamma=0.45)
man pages for function calls man pages for function calls
high-level API for reading images high-level API for reading images
final bug fixes final bug fixes

10
example.c
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@ -204,7 +204,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
/* If we don't have another value */ /* If we don't have another value */
else else
{ {
screen_gamma = 2.2; /* A good guess for a PC monitors in a brightly screen_gamma = 2.2; /* A good guess for a PC monitors in a dimly
lit room */ lit room */
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */ screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */
} }
@ -223,7 +223,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma) if (png_get_gAMA(png_ptr, info_ptr, &image_gamma)
png_set_gamma(png_ptr, screen_gamma, image_gamma); png_set_gamma(png_ptr, screen_gamma, image_gamma);
else else
png_set_gamma(png_ptr, screen_gamma, 0.51); png_set_gamma(png_ptr, screen_gamma, 0.50);
/* Dither RGB files down to 8 bit palette or reduce palettes /* Dither RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen. * to the number of colors available on your screen.
@ -255,7 +255,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
} }
/* invert monocrome files to have 0 as white and 1 as black */ /* invert monocrome files to have 0 as white and 1 as black */
png_set_invert(png_ptr); png_set_invert_mono(png_ptr);
/* If you want to shift the pixel values from the range [0,255] or /* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the * [0,65535] to the original [0,7] or [0,31], or whatever range the
@ -549,7 +549,7 @@ void write_png(char *file_name, ... other image information ...)
PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
/* set the palette if there is one. REQUIRED for indexed-color images */ /* set the palette if there is one. REQUIRED for indexed-color images */
palette = png_malloc(png_ptr, 256 * sizeof (png_color)); palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
... set palette colors ... ... set palette colors ...
png_set_PLTE(png_ptr, info_ptr, palette, 256); png_set_PLTE(png_ptr, info_ptr, palette, 256);
@ -600,7 +600,7 @@ void write_png(char *file_name, ... other image information ...)
*/ */
/* invert monocrome pixels */ /* invert monocrome pixels */
png_set_invert(png_ptr); png_set_invert_mono(png_ptr);
/* Shift the pixels up to a legal bit depth and fill in /* Shift the pixels up to a legal bit depth and fill in
* as appropriate to correctly scale the image. * as appropriate to correctly scale the image.

122
libpng.txt
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@ -1,14 +1,14 @@
libpng.txt - a description on how to use and modify libpng libpng.txt - a description on how to use and modify libpng
libpng version 0.98 libpng version 0.99
Updated and distributed by Glenn Randers-Pehrson <randeg@alumni.rpi.edu> Updated and distributed by Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
Copyright (c) 1998, Glenn Randers-Pehrson Copyright (c) 1998, Glenn Randers-Pehrson
January 16, 1998 January 30, 1998
based on: based on:
libpng 1.0 beta 6 version 0.96 libpng 1.0 beta 6 version 0.96
Updated and distributed by Andreas Dilger <adilger@enel.ucalgary.ca>, Updated and distributed by Andreas Dilger
Copyright (c) 1996, 1997 Andreas Dilger Copyright (c) 1996, 1997 Andreas Dilger
May 28, 1997 May 28, 1997
@ -239,9 +239,11 @@ Functions are used to get the information from the info_ptr:
PNG_COLOR_MASK_COLOR PNG_COLOR_MASK_COLOR
PNG_COLOR_MASK_ALPHA PNG_COLOR_MASK_ALPHA
interlace_type - PNG_INTERLACE_TYPE_NONE or PNG_INTERLACE_TYPE_ADAM7
compression_type - (must be PNG_COMPRESSION_TYPE_BASE for PNG 1.0)
filter_type - (must be PNG_FILTER_TYPE_BASE for PNG 1.0) filter_type - (must be PNG_FILTER_TYPE_BASE for PNG 1.0)
compression_type - (must be PNG_COMPRESSION_TYPE_BASE for PNG 1.0)
interlace_type - (PNG_INTERLACE_TYPE_NONE or PNG_INTERLACE_TYPE_ADAM7)
Any or all of interlace_type, compression_type, of filter_type can be
NULL if you are not interested in their values.
channels = png_get_channels(png_ptr, info_ptr); channels = png_get_channels(png_ptr, info_ptr);
channels - number of channels of info for the color type channels - number of channels of info for the color type
@ -258,6 +260,17 @@ Functions are used to get the information from the info_ptr:
libpng, the remaining 4 bytes would be in signature[4] libpng, the remaining 4 bytes would be in signature[4]
through signature[7] (see png_set_sig_bytes())). through signature[7] (see png_set_sig_bytes())).
Information from each if the IHDR fields can be retrieve separately as well:
width = png_get_image_width(png_ptr, info_ptr);
height = png_get_image_height(png_ptr, info_ptr);
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
filter_type = png_get_filter_type(png_ptr, info_ptr);
compression_type = png_get_compression_type(png_ptr, info_ptr);
interlace_type = png_get_interlace_type(png_ptr, info_ptr);
These are also important, but their validity depends on whether the chunk These are also important, but their validity depends on whether the chunk
has been read. The png_get_valid(png_ptr, info_ptr, PNG_INFO_<chunk>) and has been read. The png_get_valid(png_ptr, info_ptr, PNG_INFO_<chunk>) and
png_get_<chunk>(png_ptr, info_ptr, ...) functions return non-zero if the png_get_<chunk>(png_ptr, info_ptr, ...) functions return non-zero if the
@ -316,6 +329,15 @@ into the info_ptr is returned for any complex types.
res_y - pixels/unit physical resolution in x direction res_y - pixels/unit physical resolution in x direction
unit_type - PNG_RESOLUTION_UNKOWN, PNG_RESOLUTION_METER unit_type - PNG_RESOLUTION_UNKOWN, PNG_RESOLUTION_METER
The data from the pHYs chunk can be retrieved in several convenient
forms:
res_x_and_y = png_get_pixels_per_meter(png_ptr, info_ptr)
aspect_ratio = png_get_pixel_aspect_ratio(png_ptr, info_ptr)
(Each of these returns 0 [signifying "unknown"] if the data is not
present or if res_x is 0; res_x_and_y is 0 if res_x != res_y)
For more information, see the png_info definition in png.h and the For more information, see the png_info definition in png.h and the
PNG specification for chunk contents. Be careful with trusting PNG specification for chunk contents. Be careful with trusting
rowbytes, as some of the transformations could increase the space rowbytes, as some of the transformations could increase the space
@ -392,8 +414,21 @@ PNG can have files with 16 bits per channel. If you only can handle
if (bit_depth == 16) if (bit_depth == 16)
png_set_strip_16(png_ptr); png_set_strip_16(png_ptr);
The png_set_background() function tells libpng to composite images
with alpha or simple transparency against the supplied background
color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
you may use this color, or supply another color more suitable for
the current display (e.g., the background color from a web page). You
need to tell libpng whether the color is in the gamma space of the
display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
know why anyone would use this, but it's here).
If, for some reason, you don't need the alpha channel on an image, If, for some reason, you don't need the alpha channel on an image,
and you want to remove it rather than combining it with the background: and you want to remove it rather than combining it with the background
(but the image author certainly had in mind that you *would* combine
it with the background, so that's what you should probably do):
if (color_type & PNG_COLOR_MASK_ALPHA) if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr); png_set_strip_alpha(png_ptr);
@ -449,17 +484,6 @@ RGB. This code will do that conversion:
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr); png_set_gray_to_rgb(png_ptr);
The png_set_background() function tells libpng to composite images
with alpha or simple transparency against the supplied background
color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
you may use this color, or supply another color more suitable for
the current display (e.g., the background color from a web page). You
need to tell libpng whether the color is in the gamma space of the
display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
know why anyone would use this, but it's here).
If you have a grayscale and you are using png_set_expand() to change to If you have a grayscale and you are using png_set_expand() to change to
a higher bit-depth you must indicate if the supplied background gray a higher bit-depth you must indicate if the supplied background gray
is supplied in the original file bit depth (need_expand = 1) or in the is supplied in the original file bit depth (need_expand = 1) or in the
@ -507,15 +531,16 @@ is needed (viewing_gamma=1.0).
/* If we don't have another value */ /* If we don't have another value */
else else
{ {
screen_gamma = 2.2; /* A good guess for a PC monitor in a bright office */ screen_gamma = 2.5; /* A good guess for a PC monitor in a bright office */
screen_gamma = 1.956; /* A good guess for a PC monitor in a dim room */ screen_gamma = 2.2; /* A good guess for a PC monitor in a dim room */
screen_gamma = 2.0; /* A good guess for a PC monitor in a dark room */
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */ screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */
} }
The png_set_gamma() function handles gamma transformations of the data. The png_set_gamma() function handles gamma transformations of the data.
Pass both the file gamma and the current screen_gamma. If the file does Pass both the file gamma and the current screen_gamma. If the file does
not have a gamma value, you can pass one anyway if you have an idea what not have a gamma value, you can pass one anyway if you have an idea what
it is (usually 0.51 is a good guess for GIF images on PCs). Note it is (usually 0.50 is a good guess for GIF images on PCs). Note
that file gammas are inverted from screen gammas. See the discussions that file gammas are inverted from screen gammas. See the discussions
on gamma in the PNG specification for an excellent description of what on gamma in the PNG specification for an excellent description of what
gamma is, and why all applications should support it. It is strongly gamma is, and why all applications should support it. It is strongly
@ -524,7 +549,7 @@ recommended that PNG viewers support gamma correction.
if (png_get_gAMA(png_ptr, info_ptr, &gamma)) if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, screen_gamma, gamma); png_set_gamma(png_ptr, screen_gamma, gamma);
else else
png_set_gamma(png_ptr, screen_gamma, 0.51); png_set_gamma(png_ptr, screen_gamma, 0.50);
If you need to reduce an RGB file to a paletted file, or if a paletted If you need to reduce an RGB file to a paletted file, or if a paletted
file has more entries then will fit on your screen, png_set_dither() file has more entries then will fit on your screen, png_set_dither()
@ -579,7 +604,8 @@ need to change the order the pixels are packed into bytes, you can use:
png_set_packswap(png_ptr); png_set_packswap(png_ptr);
The last thing to handle is interlacing; this is covered in detail below, The last thing to handle is interlacing; this is covered in detail below,
but you must call the function here. but you must call the function here if you want libpng to handle expansion
of the interlaced image.
number_of_passes = png_set_interlace_handling(png_ptr); number_of_passes = png_set_interlace_handling(png_ptr);
@ -587,7 +613,7 @@ After setting the transformations, libpng can update your png_info
structure to reflect any transformations you've requested with this structure to reflect any transformations you've requested with this
call. This is most useful to update the info structure's rowbytes call. This is most useful to update the info structure's rowbytes
field so you can use it to allocate your image memory. This function field so you can use it to allocate your image memory. This function
will also update your palette with the correct display gamma and will also update your palette with the correct screen_gamma and
background if these have been given with the calls above. background if these have been given with the calls above.
png_read_update_info(png_ptr, info_ptr); png_read_update_info(png_ptr, info_ptr);
@ -970,7 +996,7 @@ contain, see the PNG specification.
Some of the more important parts of the png_info are: Some of the more important parts of the png_info are:
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, color_type, png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, color_type,
interlace_type, interlace_type, compression_type, filter_type)
width - holds the width of the image in pixels (up to 2^31). width - holds the width of the image in pixels (up to 2^31).
height - holds the height of the image in pixels (up to 2^31). height - holds the height of the image in pixels (up to 2^31).
bit_depth - holds the bit depth of one of the image channels. bit_depth - holds the bit depth of one of the image channels.
@ -987,11 +1013,9 @@ Some of the more important parts of the png_info are:
PNG_COLOR_MASK_COLOR PNG_COLOR_MASK_COLOR
PNG_COLOR_MASK_ALPHA PNG_COLOR_MASK_ALPHA
interlace_type - PNG_INTERLACE_TYPE_NONE or PNG_INTER_LACE_TYPE_ADAM7 interlace_type - PNG_INTERLACE_TYPE_NONE or PNG_INTERLACE_TYPE_ADAM7
compression_type - (must be PNG_COMPRESSION_TYPE_DEFAULT for PNG 1.0) compression_type - (must be PNG_COMPRESSION_TYPE_DEFAULT for PNG 1.0)
filter_type - (must be PNG_FILTER_TYPE_DEFAULT for PNG 1.0) filter_type - (must be PNG_FILTER_TYPE_DEFAULT for PNG 1.0)
Any or all of interlace_type, compression_type, of filter_type can be
NULL if you are not interested in their values.
png_set_PLTE(png_ptr, info_ptr, palette, num_palette); png_set_PLTE(png_ptr, info_ptr, palette, num_palette);
palette - the palette for the file (array of png_color) palette - the palette for the file (array of png_color)
@ -1005,6 +1029,12 @@ Some of the more important parts of the png_info are:
The presence of the sRGB chunk means that the pixel The presence of the sRGB chunk means that the pixel
data is in the sRGB color space. This chunk also data is in the sRGB color space. This chunk also
implies specific values of gAMA and cHRM. implies specific values of gAMA and cHRM.
Rendering intent is the CSS-1 property that has been
defined by the International Color Consortium
(http://www.color.org). It can be one of
PNG_SRGB_INTENT_SATURATION, PNG_SRGB_INTENT_PERCEPTUAL,
PNG_SRGB_INTENT_ABSOLUTE, or PNG_SRGB_INTENT_RELATIVE.
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, srgb_intent); png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, srgb_intent);
srgb_intent - the rendering intent (PNG_INFO_sRGB) srgb_intent - the rendering intent (PNG_INFO_sRGB)
@ -1222,7 +1252,7 @@ PNG files describe monochrome as black being zero and white being
one. This code would be used if the pixels are supplied with this reversed one. This code would be used if the pixels are supplied with this reversed
(black being one and white being zero): (black being one and white being zero):
png_set_invert(png_ptr); png_set_invert_mono(png_ptr);
It is possible to have libpng flush any pending output, either manually, It is possible to have libpng flush any pending output, either manually,
or automatically after a certain number of lines have been written. To or automatically after a certain number of lines have been written. To
@ -1308,8 +1338,8 @@ and only update the rows that are actually used.
After you are finished writing the image, you should finish writing After you are finished writing the image, you should finish writing
the file. If you are interested in writing comments or time, you should the file. If you are interested in writing comments or time, you should
pass the an appropriately filled png_info pointer. If you pass an appropriately filled png_info pointer. If you are not interested,
are not interested, you can pass NULL. you can pass NULL.
png_write_end(png_ptr, info_ptr); png_write_end(png_ptr, info_ptr);
@ -1501,14 +1531,19 @@ Controlling row filtering:
If you want to control whether libpng uses filtering or not, which If you want to control whether libpng uses filtering or not, which
filters are used, and how it goes about picking row filters, you filters are used, and how it goes about picking row filters, you
can call one of these functions. Filtering is enabled by default for can call one of these functions. The selection and configuration
RGB and grayscale images (with and without alpha), and for 8-bit of row filters can have a significant impact on the size and
paletted images, but not for paletted images with bit depths less encoding speed and a somewhat lesser impact on the decoding speed
than 8 bits/pixel. The 'method' parameter sets the main filtering of an image. Filtering is enabled by default for RGB and grayscale
method, which is currently only '0' in the PNG 1.0 specification. images (with and without alpha), and for 8-bit paletted images, but
The 'filters' parameter sets which filter(s), if any, should be not for paletted images with bit depths less than 8 bits/pixel.
used for each scanline. Possible values are PNG_ALL_FILTERS and
PNG_NO_FILTERS to turn filtering on and off, respectively. The 'method' parameter sets the main filtering method, which is
currently only '0' in the PNG 1.0 specification. The 'filters'
parameter sets which filter(s), if any, should be used for each
scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS
to turn filtering on and off, respectively.
Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB, Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
ORed together '|' to specify one or more filters to use. These ORed together '|' to specify one or more filters to use. These
@ -1560,10 +1595,15 @@ There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are libpng are compiled. All the defines end in _SUPPORTED. If you are
never going to use an ability, you can change the #define to #undef never going to use an ability, you can change the #define to #undef
before recompiling libpng and save yourself code and data space. before recompiling libpng and save yourself code and data space.
You can also turn them off en masse with a compiler directive to You can also turn them off en masse with a compiler directive that
define PNG_READ_NOT_FULLY_SUPPORTED or PNG_WRITE_NOT_FULLY_SUPPORTED, defines PNG_READ[or WRITE]_NOT_FULLY_SUPPORTED, or
PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
along with directives to turn on any of the capabilities that you do along with directives to turn on any of the capabilities that you do
want. want. The NOT_FULLY_SUPPORTED directives disable the extra
transformations but still leave the library fully capable of reading
and writing PNG files with all known public chunks [except for sPLT].
Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
produces a library that is incapable of reading or writing ancillary chunks.
All the reading and writing specific code are in separate files, so the All the reading and writing specific code are in separate files, so the
linker should only grab the files it needs. However, if you want to linker should only grab the files it needs. However, if you want to

2
makefile.elf
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@ -22,7 +22,7 @@ RANLIB=ranlib
#RANLIB=echo #RANLIB=echo
PNGMAJ = 2 PNGMAJ = 2
PNGMIN = 0.98 PNGMIN = 0.99
PNGVER = $(PNGMAJ).$(PNGMIN) PNGVER = $(PNGMAJ).$(PNGMIN)
# where make install puts libpng.a, libpng.so*, and png.h # where make install puts libpng.a, libpng.so*, and png.h

80
makefile.min Normal file
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@ -0,0 +1,80 @@
# makefile for libpng
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h
# Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include
ZLIBLIB=../zlib
ZLIBINC=../zlib
CC=cc
# CFLAGS=-I$(ZLIBINC) -O -fullwarn \
# -DPNG_NO_EASY_ACCESS
CFLAGS=-I$(ZLIBINC) -O -fullwarn \
-DPNG_READ_NOT_FULLY_SUPPORTED -DPNG_WRITE_NOT_FULLY_SUPPORTED
#CFLAGS=-I$(ZLIBINC) -O -fullwarn -DPNGTEST_MEMORY_DEBUG \
# -DPNG_READ_NOT_FULLY_SUPPORTED -DPNG_WRITE_NOT_FULLY_SUPPORTED \
# -DPNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED \
# -DPNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED \
# -DPNG_NO_STDIO
LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
RANLIB=echo
#RANLIB=ranlib
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o
all: libpng.a pngtest
libpng.a: $(OBJS)
ar rc $@ $(OBJS)
$(RANLIB) $@
pngtest: pngtest.o libpng.a
$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
test: pngtest
./pngtest
install: libpng.a
-@mkdir $(prefix)/include
-@mkdir $(prefix)/lib
cp png.h $(prefix)/include
cp pngconf.h $(prefix)/include
chmod 644 $(prefix)/include/png.h
chmod 644 $(prefix)/include/pngconf.h
cp libpng.a $(prefix)/lib
chmod 644 $(prefix)/lib/libpng.a
clean:
rm -f *.o libpng.a pngtest pngout.png
# DO NOT DELETE THIS LINE -- make depend depends on it.
png.o: png.h pngconf.h
pngerror.o: png.h pngconf.h
pngrio.o: png.h pngconf.h
pngwio.o: png.h pngconf.h
pngmem.o: png.h pngconf.h
pngset.o: png.h pngconf.h
pngget.o: png.h pngconf.h
pngread.o: png.h pngconf.h
pngrtran.o: png.h pngconf.h
pngrutil.o: png.h pngconf.h
pngtest.o: png.h pngconf.h
pngtrans.o: png.h pngconf.h
pngwrite.o: png.h pngconf.h
pngwtran.o: png.h pngconf.h
pngwutil.o: png.h pngconf.h
pngpread.o: png.h pngconf.h

10
png.c
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@ -1,12 +1,12 @@
/* png.c - location for general purpose libpng functions /* png.c - location for general purpose libpng functions
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -16,9 +16,9 @@
/* Version information for C files. This had better match the version /* Version information for C files. This had better match the version
* string defined in png.h. * string defined in png.h.
*/ */
char png_libpng_ver[] = "0.98"; char png_libpng_ver[5] = "0.99";
/* Place to hold the signiture string for a PNG file. */ /* Place to hold the signature string for a PNG file. */
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
/* Constant strings for known chunk types. If you need to add a chunk, /* Constant strings for known chunk types. If you need to add a chunk,
@ -132,7 +132,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
png_uint_32 num_bytes; png_uint_32 num_bytes;
num_bytes = (png_uint_32)items * size; num_bytes = (png_uint_32)items * size;
ptr = png_malloc((png_structp)png_ptr, num_bytes); ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
if (num_bytes > (png_uint_32)0x8000) if (num_bytes > (png_uint_32)0x8000)
{ {
png_memset(ptr, 0, (png_size_t)0x8000L); png_memset(ptr, 0, (png_size_t)0x8000L);

152
png.h
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@ -1,12 +1,12 @@
/* png.h - header file for PNG reference library /* png.h - header file for PNG reference library
* *
* libpng 0.98 beta * libpng 0.99 beta
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998 Glenn Randers-Pehrson * Copyright (c) 1998 Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* Note about libpng version numbers: * Note about libpng version numbers:
* *
@ -119,30 +119,30 @@ extern "C" {
*/ */
/* Version information for png.h - this should match the version in png.c */ /* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "0.98" #define PNG_LIBPNG_VER_STRING "0.99"
/* careful here. At one time, I wanted to use 082, but that would be octal. /* careful here. At one time, I wanted to use 082, but that would be octal.
* Version 1.0 will be 100 here, etc. * Version 1.0 will be 100 here, etc.
*/ */
#define PNG_LIBPNG_VER 98 #define PNG_LIBPNG_VER 99
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ /* 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)
/* Version information for C files, stored in png.c. This had better match /* Version information for C files, stored in png.c. This had better match
* the version above. * the version above.
*/ */
extern char png_libpng_ver[]; extern char png_libpng_ver[5];
/* Structures to facilitate easy interlacing. See png.c for more details */ /* Structures to facilitate easy interlacing. See png.c for more details */
extern int FARDATA png_pass_start[]; extern int FARDATA png_pass_start[7];
extern int FARDATA png_pass_inc[]; extern int FARDATA png_pass_inc[7];
extern int FARDATA png_pass_ystart[]; extern int FARDATA png_pass_ystart[7];
extern int FARDATA png_pass_yinc[]; extern int FARDATA png_pass_yinc[7];
extern int FARDATA png_pass_mask[]; extern int FARDATA png_pass_mask[7];
extern int FARDATA png_pass_dsp_mask[]; extern int FARDATA png_pass_dsp_mask[7];
/* These aren't currently used. If you need them, see png.c for more details /* These aren't currently used. If you need them, see png.c for more details
extern int FARDATA png_pass_width[]; extern int FARDATA png_pass_width[7];
extern int FARDATA png_pass_height[]; extern int FARDATA png_pass_height[7];
*/ */
#endif /* PNG_NO_EXTERN */ #endif /* PNG_NO_EXTERN */
@ -268,7 +268,8 @@ typedef struct png_info_struct
* and initialize the appropriate fields below. * and initialize the appropriate fields below.
*/ */
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \
defined(PNG_READ_GAMMA_SUPPORTED)
/* The gAMA chunk describes the gamma characteristics of the system /* The gAMA chunk describes the gamma characteristics of the system
* on which the image was created, normally in the range [1.0, 2.5]. * on which the image was created, normally in the range [1.0, 2.5].
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero. * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
@ -323,7 +324,8 @@ typedef struct png_info_struct
png_bytep trans; /* transparent values for paletted image */ png_bytep trans; /* transparent values for paletted image */
png_color_16 trans_values; /* transparent color for non-palette image */ png_color_16 trans_values; /* transparent color for non-palette image */
#endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \
defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The bKGD chunk gives the suggested image background color if the /* The bKGD chunk gives the suggested image background color if the
* display program does not have its own background color and the image * display program does not have its own background color and the image
* is needs to composited onto a background before display. The colors * is needs to composited onto a background before display. The colors
@ -444,6 +446,15 @@ typedef png_info FAR * FAR * png_infopp;
#define PNG_RESOLUTION_METER 1 /* pixels/meter */ #define PNG_RESOLUTION_METER 1 /* pixels/meter */
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
/* These are for the sRGB chunk. These values should NOT be changed. */
#define PNG_sRGB_INTENT_SATURATION 0
#define PNG_sRGB_INTENT_PERCEPTUAL 1
#define PNG_sRGB_INTENT_ABSOLUTE 2
#define PNG_sRGB_INTENT_RELATIVE 3
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
/* These determine if an ancillary chunk's data has been successfully read /* These determine if an ancillary chunk's data has been successfully read
* from the PNG header, or if the application has filled in the corresponding * from the PNG header, or if the application has filled in the corresponding
* data in the info_struct to be written into the output file. The values * data in the info_struct to be written into the output file. The values
@ -636,8 +647,10 @@ struct png_struct_def
#if defined(PNG_READ_DITHER_SUPPORTED) #if defined(PNG_READ_DITHER_SUPPORTED)
png_bytep palette_lookup; /* lookup table for dithering */ png_bytep palette_lookup; /* lookup table for dithering */
png_bytep dither_index; /* index translation for palette files */ png_bytep dither_index; /* index translation for palette files */
png_uint_16p hist; /* histogram */
#endif /* PNG_READ_DITHER_SUPPORTED */ #endif /* PNG_READ_DITHER_SUPPORTED */
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED)
png_uint_16p hist; /* histogram */
#endif
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_byte heuristic_method; /* heuristic for row filter selection */ png_byte heuristic_method; /* heuristic for row filter selection */
png_byte num_prev_filters; /* number of weights for previous rows */ png_byte num_prev_filters; /* number of weights for previous rows */
@ -1091,6 +1104,13 @@ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
/* frees a pointer allocated by png_malloc() */ /* 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_free) PNGARG((png_structp png_ptr, png_voidp ptr));
#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,
png_uint_32 size));
extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
#endif
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */ #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
extern void *far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,int check)); extern void *far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,int check));
#endif /* USE_FAR_KEYWORD */ #endif /* USE_FAR_KEYWORD */
@ -1123,18 +1143,67 @@ extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
* to avoid problems with future changes in the size and internal layout of * to avoid problems with future changes in the size and internal layout of
* png_info_struct. * png_info_struct.
*/ */
/* Returns "flag" if chunk data is valid in info_ptr */ /* Returns "flag" if chunk data is valid in info_ptr. */
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 flag)); png_infop info_ptr, png_uint_32 flag));
/* Returns number of bytes needed to hold a transformed row */ /* Returns number of bytes needed to hold a transformed row. */
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
png_infop info_ptr)); png_infop info_ptr));
/* Returns number of color channels in image */ /* Returns number of color channels in image. */
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
png_infop info_ptr)); png_infop info_ptr));
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* Returns image width in pixels. */
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image height in pixels. */
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image bit_depth. */
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image color_type. */
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image filter_type. */
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image interlace_type. */
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image compression_type. */
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
#endif /* PNG_EASY_ACCESS_SUPPORTED */
/* Returns pointer to signature string read from PNG header */ /* Returns pointer to signature string read from PNG header */
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
png_infop info_ptr)); png_infop info_ptr));
@ -1294,6 +1363,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
* libpng yet, but more support will be added as needed. * libpng yet, but more support will be added as needed.
*/ */
#if (PNG_DEBUG > 0) #if (PNG_DEBUG > 0)
#ifdef PNG_NO_STDIO
#include <stdio.h>
#endif
#ifndef PNG_DEBUG_FILE #ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr #define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */ #endif /* PNG_DEBUG_FILE */
@ -1411,31 +1483,31 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#ifndef PNG_NO_EXTERN #ifndef PNG_NO_EXTERN
/* place to hold the signiture string for a PNG file. */ /* place to hold the signature string for a PNG file. */
extern png_byte FARDATA png_sig[]; extern png_byte FARDATA png_sig[8];
/* Constant strings for known chunk types. If you need to add a chunk, /* Constant strings for known chunk types. If you need to add a chunk,
* add a string holding the name here. See png.c for more details. We * add a string holding the name here. See png.c for more details. We
* can't selectively include these, since we still check for chunk in the * can't selectively include these, since we still check for chunk in the
* wrong locations with these labels. * wrong locations with these labels.
*/ */
extern png_byte FARDATA png_IHDR[]; extern png_byte FARDATA png_IHDR[5];
extern png_byte FARDATA png_IDAT[]; extern png_byte FARDATA png_IDAT[5];
extern png_byte FARDATA png_IEND[]; extern png_byte FARDATA png_IEND[5];
extern png_byte FARDATA png_PLTE[]; extern png_byte FARDATA png_PLTE[5];
extern png_byte FARDATA png_bKGD[]; extern png_byte FARDATA png_bKGD[5];
extern png_byte FARDATA png_cHRM[]; extern png_byte FARDATA png_cHRM[5];
extern png_byte FARDATA png_gAMA[]; extern png_byte FARDATA png_gAMA[5];
extern png_byte FARDATA png_hIST[]; extern png_byte FARDATA png_hIST[5];
extern png_byte FARDATA png_oFFs[]; extern png_byte FARDATA png_oFFs[5];
extern png_byte FARDATA png_pCAL[]; extern png_byte FARDATA png_pCAL[5];
extern png_byte FARDATA png_pHYs[]; extern png_byte FARDATA png_pHYs[5];
extern png_byte FARDATA png_sBIT[]; extern png_byte FARDATA png_sBIT[5];
extern png_byte FARDATA png_sRGB[]; extern png_byte FARDATA png_sRGB[5];
extern png_byte FARDATA png_tEXt[]; extern png_byte FARDATA png_tEXt[5];
extern png_byte FARDATA png_tIME[]; extern png_byte FARDATA png_tIME[5];
extern png_byte FARDATA png_tRNS[]; extern png_byte FARDATA png_tRNS[5];
extern png_byte FARDATA png_zTXt[]; extern png_byte FARDATA png_zTXt[5];
#endif /* PNG_NO_EXTERN */ #endif /* PNG_NO_EXTERN */
@ -1550,7 +1622,7 @@ PNG_EXTERN void png_write_chunk_data PNGARG((png_structp png_ptr,
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
PNG_EXTERN void png_write_chunk_end PNGARG((png_structp png_ptr)); PNG_EXTERN void png_write_chunk_end PNGARG((png_structp png_ptr));
/* simple function to write the signiture */ /* simple function to write the signature */
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
/* write various chunks */ /* write various chunks */

73
pngconf.h
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@ -1,12 +1,12 @@
/* pngconf.c - machine configurable file for libpng /* pngconf.c - machine configurable file for libpng
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
/* Any machine specific code is near the front of this file, so if you /* Any machine specific code is near the front of this file, so if you
@ -27,7 +27,7 @@
* where it becomes significant, if you are concerned with memory * where it becomes significant, if you are concerned with memory
* usage. Note that zlib allocates at least 32Kb also. For readers, * usage. Note that zlib allocates at least 32Kb also. For readers,
* this describes the size of the buffer available to read the data in. * this describes the size of the buffer available to read the data in.
* Unless this gets smaller then the size of a row (compressed), * Unless this gets smaller than the size of a row (compressed),
* it should not make much difference how big this is. * it should not make much difference how big this is.
*/ */
@ -55,8 +55,6 @@
* #define PNG_NO_STDIO * #define PNG_NO_STDIO
*/ */
/* We still need stdio.h for FILE even when PNG_NO_STDIO is defined.
*/
#ifndef PNG_NO_STDIO #ifndef PNG_NO_STDIO
#include <stdio.h> #include <stdio.h>
#endif #endif
@ -88,10 +86,12 @@
* just __MWERKS__ is not good enough, because the Codewarrior is now used * just __MWERKS__ is not good enough, because the Codewarrior is now used
* on non-Mac platforms. * on non-Mac platforms.
*/ */
#ifndef MACOS
#if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ #if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
defined(THINK_C) || defined(__SC__) defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
#define MACOS #define MACOS
#endif #endif
#endif
/* enough people need this for various reasons to include it here */ /* enough people need this for various reasons to include it here */
#if !defined(MACOS) && !defined(RISCOS) #if !defined(MACOS) && !defined(RISCOS)
@ -157,6 +157,11 @@ __dont__ include it again
#include <math.h> #include <math.h>
#endif #endif
/* Codewarrior on NT has linking problems without this. */
#if defined(__MWERKS__) && defined(WIN32)
#define PNG_ALWAYS_EXTERN
#endif
/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not /* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
* stdlib.h like it should (I think). Or perhaps this is a C++ * stdlib.h like it should (I think). Or perhaps this is a C++
* "feature"? * "feature"?
@ -234,7 +239,8 @@ __dont__ include it again
/* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user /* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user
to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line, to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line,
then pick and choose which ones to define without having to edit then pick and choose which ones to define without having to edit
this file */ this file.
*/
#ifndef PNG_READ_NOT_FULLY_SUPPORTED #ifndef PNG_READ_NOT_FULLY_SUPPORTED
#define PNG_READ_FULLY_SUPPORTED #define PNG_READ_FULLY_SUPPORTED
@ -245,7 +251,6 @@ __dont__ include it again
#ifdef PNG_READ_FULLY_SUPPORTED #ifdef PNG_READ_FULLY_SUPPORTED
#define PNG_PROGRESSIVE_READ_SUPPORTED #define PNG_PROGRESSIVE_READ_SUPPORTED
#define PNG_READ_OPT_PLTE_SUPPORTED
#define PNG_READ_EXPAND_SUPPORTED #define PNG_READ_EXPAND_SUPPORTED
#define PNG_READ_SHIFT_SUPPORTED #define PNG_READ_SHIFT_SUPPORTED
#define PNG_READ_PACK_SUPPORTED #define PNG_READ_PACK_SUPPORTED
@ -264,10 +269,10 @@ __dont__ include it again
#define PNG_READ_STRIP_ALPHA_SUPPORTED #define PNG_READ_STRIP_ALPHA_SUPPORTED
#define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel */ #define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel */
#endif /* PNG_READ_FULLY_SUPPORTED */ #endif /* PNG_READ_FULLY_SUPPORTED */
#define PNG_READ_INTERLACING_SUPPORTED
#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
#ifdef PNG_WRITE_FULLY_SUPPORTED #ifdef PNG_WRITE_FULLY_SUPPORTED
#define PNG_WRITE_INTERLACING_SUPPORTED
#define PNG_WRITE_SHIFT_SUPPORTED #define PNG_WRITE_SHIFT_SUPPORTED
#define PNG_WRITE_PACK_SUPPORTED #define PNG_WRITE_PACK_SUPPORTED
#define PNG_WRITE_BGR_SUPPORTED #define PNG_WRITE_BGR_SUPPORTED
@ -281,10 +286,34 @@ __dont__ include it again
#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif /* PNG_WRITE_FULLY_SUPPORTED */ #endif /* PNG_WRITE_FULLY_SUPPORTED */
#define PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant */
/* encoders, but can cause trouble
if left undefined */
#if !defined(PNG_NO_STDIO) #if !defined(PNG_NO_STDIO)
#define PNG_TIME_RFC1123_SUPPORTED #define PNG_TIME_RFC1123_SUPPORTED
#endif #endif
/* This adds extra functions in pngget.c for accessing data from the
* info pointer (added in version 0.99)
* png_get_image_width()
* png_get_image_height()
* png_get_bit_depth()
* png_get_color_type()
* png_get_compression_type()
* png_get_filter_type()
* png_get_interlace_type()
* png_get_pixel_aspect_ratio()
* png_get_pixels_per_meter()
* png_get_x_offset_pixels()
* png_get_y_offset_pixels()
* png_get_x_offset_microns()
* png_get_y_offset_microns()
*/
#if !defined(PNG_NO_EASY_ACCESS)
#define PNG_EASY_ACCESS_SUPPORTED
#endif
/* These are currently experimental features, define them if you want */ /* These are currently experimental features, define them if you want */
/* very little testing */ /* very little testing */
@ -307,11 +336,17 @@ __dont__ include it again
/* Any chunks you are not interested in, you can undef here. The /* Any chunks you are not interested in, you can undef here. The
* ones that allocate memory may be expecially important (hIST, * ones that allocate memory may be expecially important (hIST,
* tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info * tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info
* a bit smaller. OPT_PLTE only disables the optional palette in RGB * a bit smaller.
* and RGBA images.
*/ */
#ifdef PNG_READ_FULLY_SUPPORTED #ifndef PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED
#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#endif
#ifndef PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED
#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#endif
#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#define PNG_READ_bKGD_SUPPORTED #define PNG_READ_bKGD_SUPPORTED
#define PNG_READ_cHRM_SUPPORTED #define PNG_READ_cHRM_SUPPORTED
#define PNG_READ_gAMA_SUPPORTED #define PNG_READ_gAMA_SUPPORTED
@ -325,9 +360,11 @@ __dont__ include it again
#define PNG_READ_tIME_SUPPORTED #define PNG_READ_tIME_SUPPORTED
#define PNG_READ_tRNS_SUPPORTED #define PNG_READ_tRNS_SUPPORTED
#define PNG_READ_zTXt_SUPPORTED #define PNG_READ_zTXt_SUPPORTED
#endif /* PNG_READ_FULLY_SUPPORTED */ #define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
/* PLTE chunk in RGB and RGBA images */
#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
#ifdef PNG_WRITE_FULLY_SUPPORTED #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#define PNG_WRITE_bKGD_SUPPORTED #define PNG_WRITE_bKGD_SUPPORTED
#define PNG_WRITE_cHRM_SUPPORTED #define PNG_WRITE_cHRM_SUPPORTED
#define PNG_WRITE_gAMA_SUPPORTED #define PNG_WRITE_gAMA_SUPPORTED
@ -341,7 +378,7 @@ __dont__ include it again
#define PNG_WRITE_tIME_SUPPORTED #define PNG_WRITE_tIME_SUPPORTED
#define PNG_WRITE_tRNS_SUPPORTED #define PNG_WRITE_tRNS_SUPPORTED
#define PNG_WRITE_zTXt_SUPPORTED #define PNG_WRITE_zTXt_SUPPORTED
#endif /* PNG_WRITE_FULLY_SUPPORTED */ #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
/* need the time information for reading tIME chunks */ /* need the time information for reading tIME chunks */
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
@ -467,7 +504,7 @@ typedef z_stream FAR * png_zstreamp;
/* allow for compilation as dll with BORLAND C++ 5.0 */ /* allow for compilation as dll with BORLAND C++ 5.0 */
#if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__) #if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
# define PNG_EXPORT(t,s) t _export s # define PNG_EXPORT(type,symbol) type _export symbol
#endif #endif
/* allow for compilation as shared lib under BeOS */ /* allow for compilation as shared lib under BeOS */
@ -476,7 +513,7 @@ typedef z_stream FAR * png_zstreamp;
#endif #endif
#ifndef PNG_EXPORT #ifndef PNG_EXPORT
#define PNG_EXPORT(t,s) t s #define PNG_EXPORT(type,symbol) type symbol
#endif #endif

4
pngerror.c
View File

@ -1,12 +1,12 @@
/* pngerror.c - stub functions for i/o and memory allocation /* pngerror.c - stub functions for i/o and memory allocation
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file provides a location for all error handling. Users which * This file provides a location for all error handling. Users which
* need special error handling are expected to write replacement functions * need special error handling are expected to write replacement functions

177
pngget.c
View File

@ -1,12 +1,12 @@
/* pngget.c - retrieval of values from info struct /* pngget.c - retrieval of values from info struct
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -30,6 +30,179 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
return(0); return(0);
} }
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* easy access to info, added in libpng-0.99 */
png_uint_32
png_get_image_width(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->width;
}
return (0);
}
png_uint_32
png_get_image_height(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->height;
}
return (0);
}
png_byte
png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->bit_depth;
}
return (0);
}
png_byte
png_get_color_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->color_type;
}
return (0);
}
png_byte
png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->filter_type;
}
return (0);
}
png_byte
png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->interlace_type;
}
return (0);
}
png_byte
png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr != NULL)
{
return info_ptr->compression_type;
}
return (0);
}
png_uint_32
png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->x_pixels_per_unit);
}
else
#endif
return (0);
}
float
png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
if (info_ptr->x_pixels_per_unit == 0)
return NULL;
else
return (float)info_ptr->y_pixels_per_unit
/(float)info_ptr->x_pixels_per_unit;
}
else
#endif
return (0);
}
png_uint_32
png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->x_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->y_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->x_offset);
}
else
#endif
return (0);
}
png_uint_32
png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->y_offset);
}
else
#endif
return (0);
}
/* png_get_channels really belongs in here, too, but it's been around longer */
#endif
png_byte png_byte
png_get_channels(png_structp png_ptr, png_infop info_ptr) png_get_channels(png_structp png_ptr, png_infop info_ptr)
{ {

30
pngmem.c
View File

@ -1,11 +1,11 @@
/* pngmem.c - stub functions for memory allocation /* pngmem.c - stub functions for memory allocation
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file provides a location for all memory allocation. Users which * This file provides a location for all memory allocation. Users which
* need special memory handling are expected to modify the code in this file * need special memory handling are expected to modify the code in this file
@ -58,7 +58,10 @@ void
png_destroy_struct(png_voidp struct_ptr) png_destroy_struct(png_voidp struct_ptr)
{ {
if (struct_ptr != NULL) if (struct_ptr != NULL)
{
farfree (struct_ptr); farfree (struct_ptr);
struct_ptr = NULL;
}
} }
/* Allocate memory. For reasonable files, size should never exceed /* Allocate memory. For reasonable files, size should never exceed
@ -107,8 +110,10 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
png_byte huge * hptr; png_byte huge * hptr;
if (ret != NULL) if (ret != NULL)
{
farfree(ret); farfree(ret);
ret = NULL; ret = NULL;
}
num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
if (num_blocks < 1) if (num_blocks < 1)
@ -124,7 +129,7 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
if (table == NULL) if (table == NULL)
{ {
png_error(png_ptr, "Out of Memory"); png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
} }
if ((png_size_t)table & 0xfff0) if ((png_size_t)table & 0xfff0)
@ -138,7 +143,7 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
if (png_ptr->offset_table_ptr == NULL) if (png_ptr->offset_table_ptr == NULL)
{ {
png_error(png_ptr, "Out of memory"); png_error(png_ptr, "Out Of memory.");
} }
hptr = (png_byte huge *)table; hptr = (png_byte huge *)table;
@ -160,7 +165,7 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
} }
if (png_ptr->offset_table_count >= png_ptr->offset_table_number) if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
png_error(png_ptr, "Out of Memory"); png_error(png_ptr, "Out of Memory.");
ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
} }
@ -169,7 +174,7 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
if (ret == NULL) if (ret == NULL)
{ {
png_error(png_ptr, "Out of Memory"); png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
} }
return ret; return ret;
@ -207,7 +212,10 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
} }
if (ptr != NULL) if (ptr != NULL)
{
farfree(ptr); farfree(ptr);
ptr = NULL;
}
} }
#else /* Not the Borland DOS special memory handler */ #else /* Not the Borland DOS special memory handler */
@ -250,15 +258,20 @@ void
png_destroy_struct(png_voidp struct_ptr) png_destroy_struct(png_voidp struct_ptr)
{ {
if (struct_ptr != NULL) if (struct_ptr != NULL)
{
#if defined(__TURBOC__) && !defined(__FLAT__) #if defined(__TURBOC__) && !defined(__FLAT__)
farfree(struct_ptr); farfree(struct_ptr);
struct_ptr = NULL;
#else #else
# if defined(_MSC_VER) && defined(MAXSEG_64K) # if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(struct_ptr); hfree(struct_ptr);
struct_ptr = NULL;
# else # else
free(struct_ptr); free(struct_ptr);
struct_ptr = NULL;
# endif # endif
#endif #endif
}
} }
@ -309,11 +322,14 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
#if defined(__TURBOC__) && !defined(__FLAT__) #if defined(__TURBOC__) && !defined(__FLAT__)
farfree(ptr); farfree(ptr);
ptr = NULL;
#else #else
# if defined(_MSC_VER) && defined(MAXSEG_64K) # if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(ptr); hfree(ptr);
ptr = NULL;
# else # else
free(ptr); free(ptr);
ptr = NULL;
# endif # endif
#endif #endif
} }

6
pngpread.c
View File

@ -1,12 +1,12 @@
/* pngpread.c - read a png file in push mode /* pngpread.c - read a png file in push mode
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -992,7 +992,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
png_charp tmp; png_charp tmp;
tmp = text; tmp = text;
text = png_malloc(png_ptr, text_size + text = (png_charp)png_malloc(png_ptr, text_size +
png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1); png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1);
png_memcpy(text, tmp, text_size); png_memcpy(text, tmp, text_size);
png_free(png_ptr, tmp); png_free(png_ptr, tmp);

12
pngread.c
View File

@ -1,12 +1,12 @@
/* pngread.c - read a PNG file /* pngread.c - read a PNG file
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file contains routines that an application calls directly to * This file contains routines that an application calls directly to
* read a PNG file or stream. * read a PNG file or stream.
@ -58,7 +58,7 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
/* initialize zbuf - compression buffer */ /* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE; png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size); png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_ptr->zstream.zalloc = png_zalloc; png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree; png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr; png_ptr->zstream.opaque = (voidpf)png_ptr;
@ -100,7 +100,7 @@ png_read_init(png_structp png_ptr)
/* initialize zbuf - compression buffer */ /* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE; png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size); png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_ptr->zstream.zalloc = png_zalloc; png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree; png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr; png_ptr->zstream.opaque = (voidpf)png_ptr;
@ -665,7 +665,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
if (end_info_ptr != NULL) if (end_info_ptr != NULL)
{ {
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
png_free(png_ptr, info_ptr->text); png_free(png_ptr, end_info_ptr->text);
#endif #endif
png_destroy_struct((png_voidp)end_info_ptr); png_destroy_struct((png_voidp)end_info_ptr);
*end_info_ptr_ptr = (png_infop)NULL; *end_info_ptr_ptr = (png_infop)NULL;
@ -710,7 +710,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
png_free(png_ptr, png_ptr->gamma_to_1); png_free(png_ptr, png_ptr->gamma_to_1);
#endif #endif
if (png_ptr->flags & PNG_FLAG_FREE_PALETTE) if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
png_free(png_ptr, png_ptr->palette); png_zfree(png_ptr, png_ptr->palette);
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_bKGD_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_bKGD_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_FREE_TRANS) if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
png_free(png_ptr, png_ptr->trans); png_free(png_ptr, png_ptr->trans);

4
pngrio.c
View File

@ -1,12 +1,12 @@
/* pngrio.c - functions for data input /* pngrio.c - functions for data input
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file provides a location for all input. Users which need * This file provides a location for all input. Users which need
* special handling are expected to write a function which has the same * special handling are expected to write a function which has the same

6
pngrtran.c
View File

@ -1,12 +1,12 @@
/* pngrtran.c - transforms the data in a row for PNG readers /* pngrtran.c - transforms the data in a row for PNG readers
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file contains functions optionally called by an application * This file contains functions optionally called by an application
* in order to tell libpng how to handle data when reading a PNG. * in order to tell libpng how to handle data when reading a PNG.
@ -372,7 +372,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
{ {
png_dsortp t; png_dsortp t;
t = png_malloc(png_ptr, sizeof (png_dsort)); t = (png_dsortp)png_malloc(png_ptr, sizeof (png_dsort));
t->next = hash[d]; t->next = hash[d];
t->left = (png_byte)i; t->left = (png_byte)i;
t->right = (png_byte)j; t->right = (png_byte)j;

21
pngrutil.c
View File

@ -1,12 +1,12 @@
/* pngrutil.c - utilities to read a PNG file /* pngrutil.c - utilities to read a PNG file
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file contains routines which are only called from within * This file contains routines which are only called from within
* libpng itself during the course of reading an image. * libpng itself during the course of reading an image.
@ -298,10 +298,13 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
whatever the normal CRC configuration tells us. However, if we whatever the normal CRC configuration tells us. However, if we
have an RGB image, the PLTE can be considered ancillary, so have an RGB image, the PLTE can be considered ancillary, so
we will act as though it is. */ we will act as though it is. */
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{ {
png_crc_finish(png_ptr, 0); png_crc_finish(png_ptr, 0);
} }
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */
{ {
/* If we don't want to use the data from an ancillary chunk, /* If we don't want to use the data from an ancillary chunk,
@ -328,7 +331,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_chunk_warning(png_ptr, "CRC error"); png_chunk_warning(png_ptr, "CRC error");
} }
} }
#endif
png_ptr->palette = palette; png_ptr->palette = palette;
png_ptr->num_palette = (png_uint_16)num; png_ptr->num_palette = (png_uint_16)num;
png_set_PLTE(png_ptr, info_ptr, palette, num); png_set_PLTE(png_ptr, info_ptr, palette, num);
@ -404,7 +407,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#if defined(PNG_READ_sRGB_SUPPORTED) #if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB) if (info_ptr->valid & PNG_INFO_sRGB)
if(igamma != (png_uint_32)51000L) if(igamma != (png_uint_32)45000L)
{ {
png_warning(png_ptr, png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present"); "Ignoring incorrect gAMA value when sRGB is also present");
@ -416,7 +419,9 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif /* PNG_READ_sRGB_SUPPORTED */ #endif /* PNG_READ_sRGB_SUPPORTED */
file_gamma = (float)igamma / (float)100000.0; file_gamma = (float)igamma / (float)100000.0;
#ifdef PNG_READ_GAMMA_SUPPORTED
png_ptr->gamma = file_gamma; png_ptr->gamma = file_gamma;
#endif
png_set_gAMA(png_ptr, info_ptr, file_gamma); png_set_gAMA(png_ptr, info_ptr, file_gamma);
} }
#endif #endif
@ -663,15 +668,15 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
intent = buf[0]; intent = buf[0];
/* check for bad intent */ /* check for bad intent */
if (intent > 3) if (intent >= PNG_sRGB_INTENT_LAST)
{ {
png_warning(png_ptr, "Unknown sRGB intent"); png_warning(png_ptr, "Unknown sRGB intent");
return; return;
} }
#ifdef PNG_READ_gAMA_SUPPORTED #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
if ((info_ptr->valid & PNG_INFO_gAMA)) if ((info_ptr->valid & PNG_INFO_gAMA))
if((png_uint_32)(png_ptr->gamma*(float)100000.+.5) != (png_uint_32)51000L) if((png_uint_32)(png_ptr->gamma*(float)100000.+.5) != (png_uint_32)45000L)
{ {
png_warning(png_ptr, png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present"); "Ignoring incorrect gAMA value when sRGB is also present");
@ -1329,7 +1334,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_charp tmp; png_charp tmp;
tmp = text; tmp = text;
text = png_malloc(png_ptr, text_size + text = (png_charp)png_malloc(png_ptr, text_size +
png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1); png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1);
png_memcpy(text, tmp, text_size); png_memcpy(text, tmp, text_size);
png_free(png_ptr, tmp); png_free(png_ptr, tmp);

6
pngset.c
View File

@ -1,12 +1,12 @@
/* pngset.c - storage of image information into info struct /* pngset.c - storage of image information into info struct
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* The functions here are used during reads to store data from the file * The functions here are used during reads to store data from the file
* into the info struct, and during writes to store application data * into the info struct, and during writes to store application data
@ -239,7 +239,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
png_set_sRGB(png_ptr, info_ptr, intent); png_set_sRGB(png_ptr, info_ptr, intent);
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
file_gamma = (float).51; file_gamma = (float).45;
png_set_gAMA(png_ptr, info_ptr, file_gamma); png_set_gAMA(png_ptr, info_ptr, file_gamma);
#endif #endif

240
pngtest.c
View File

@ -1,12 +1,12 @@
/* pngtest.c - a simple test program to test libpng /* pngtest.c - a simple test program to test libpng
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This program reads in a PNG image, writes it out again, and then * 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 * compares the two files. If the files are identical, this shows that
@ -37,6 +37,11 @@
#include "png.h" #include "png.h"
#ifdef PNGTEST_MEMORY_DEBUG
#include <unistd.h>
void *sbrk (ssize_t incr);
#endif
int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname); int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname);
#ifdef __TURBOC__ #ifdef __TURBOC__
@ -47,6 +52,8 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname);
/* #define STDERR stderr */ /* #define STDERR stderr */
#define STDERR stdout /* for DOS */ #define STDERR stdout /* for DOS */
static int verbose = 0;
#if defined(PNG_NO_STDIO) #if defined(PNG_NO_STDIO)
/* START of code to validate stdio-free compilation */ /* START of code to validate stdio-free compilation */
/* These copies of the default read/write functions come from pngrio.c and */ /* These copies of the default read/write functions come from pngrio.c and */
@ -57,6 +64,8 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname);
than changing the library. */ than changing the library. */
#ifndef USE_FAR_KEYWORD #ifndef USE_FAR_KEYWORD
static void static void
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
static void
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{ {
png_size_t check; png_size_t check;
@ -81,6 +90,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
#define NEAR_BUF_SIZE 1024 #define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b) #define MIN(a,b) (a <= b ? a : b)
static void
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
static void static void
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{ {
@ -124,6 +135,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
#if defined(PNG_WRITE_FLUSH_SUPPORTED) #if defined(PNG_WRITE_FLUSH_SUPPORTED)
static void static void
png_default_flush(png_structp png_ptr);
static void
png_default_flush(png_structp png_ptr) png_default_flush(png_structp png_ptr)
{ {
FILE *io_ptr; FILE *io_ptr;
@ -139,6 +152,8 @@ png_default_flush(png_structp png_ptr)
than changing the library. */ than changing the library. */
#ifndef USE_FAR_KEYWORD #ifndef USE_FAR_KEYWORD
static void static void
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
static void
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{ {
png_uint_32 check; png_uint_32 check;
@ -158,6 +173,8 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
#define NEAR_BUF_SIZE 1024 #define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b) #define MIN(a,b) (a <= b ? a : b)
static void
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
static void static void
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{ {
@ -229,6 +246,107 @@ png_default_error(png_structp png_ptr, png_const_charp message)
#endif /* PNG_NO_STDIO */ #endif /* PNG_NO_STDIO */
/* END of code to validate stdio-free compilation */ /* END of code to validate stdio-free compilation */
/* START of code to validate memory allocation and deallocation */
#ifdef PNGTEST_MEMORY_DEBUG
/* Borland DOS special memory handler */
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
ERROR - memory debugging is not supported on this platform
#else
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
it not to. See zconf.h and png.h for more information. zlib does
need to allocate exactly 64K, so whatever you call here must
have the ability to do that.
This piece of code can be compiled to validate max 64K allocations
by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
typedef struct memory_information {
png_uint_32 size;
png_voidp pointer;
struct memory_information FAR *next;
} memory_information;
typedef memory_information FAR *memory_infop;
static memory_infop pinformation = NULL;
static int current_allocation = 0;
static int maximum_allocation = 0;
extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
png_voidp
png_malloc(png_structp png_ptr, png_uint_32 size) {
if (png_ptr == NULL) {
fprintf(STDERR, "NULL pointer to memory allocator\n");
return NULL;
}
if (size == 0)
return NULL;
/* This calls the library allocator twice, once to get the requested
buffer and once to get a new free list entry. */
{
memory_infop pinfo = png_debug_malloc(png_ptr, sizeof *pinfo);
pinfo->size = size;
current_allocation += size;
if (current_allocation > maximum_allocation)
maximum_allocation = current_allocation;
pinfo->pointer = png_debug_malloc(png_ptr, size);
pinfo->next = pinformation;
pinformation = pinfo;
/* Make sure the caller isn't assuming zeroed memory. */
png_memset(pinfo->pointer, 0xdd, pinfo->size);
return pinfo->pointer;
}
}
/* Free a pointer. It is removed from the list at the same time. */
void
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to memory allocator\n");
if (ptr == 0) {
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
#endif
return;
}
/* Unlink the element from the list. */
{
memory_infop FAR *ppinfo = &pinformation;
for (;;) {
memory_infop pinfo = *ppinfo;
if (pinfo->pointer == ptr) {
*ppinfo = pinfo->next;
current_allocation -= pinfo->size;
if (current_allocation < 0)
fprintf(STDERR, "Duplicate free of memory\n");
/* We must free the list element too, but first kill
the memory which is to be freed. */
memset(ptr, 0x55, pinfo->size);
png_debug_free(png_ptr, pinfo);
break;
}
if (pinfo->next == NULL) {
fprintf(STDERR, "Pointer %x not found\n", ptr);
break;
}
ppinfo = &pinfo->next;
}
}
/* Finally free the data. */
png_debug_free(png_ptr, ptr);
}
#endif /* Not Borland DOS special memory handler */
#endif
/* END of code to test memory allocation/deallocation */
/* Test one file */ /* Test one file */
int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
{ {
@ -338,7 +456,11 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
&color_type, &interlace_type, &compression_type, &filter_type)) &color_type, &interlace_type, &compression_type, &filter_type))
{ {
png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth, png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
color_type, interlace_type, compression_type, filter_type); color_type, interlace_type, compression_type, filter_type);
#else
color_type, PNG_INTERLACE_NONE, compression_type, filter_type);
#endif
} }
} }
#if defined(PNG_READ_bKGD_SUPPORTED) && defined(PNG_WRITE_bKGD_SUPPORTED) #if defined(PNG_READ_bKGD_SUPPORTED) && defined(PNG_WRITE_bKGD_SUPPORTED)
@ -518,6 +640,17 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_read_end(read_ptr, end_info_ptr); png_read_end(read_ptr, end_info_ptr);
png_write_end(write_ptr, end_info_ptr); png_write_end(write_ptr, end_info_ptr);
#ifdef PNG_EASY_ACCESS_SUPPORTED
if(verbose)
{
png_uint_32 iwidth, iheight;
iwidth = png_get_image_width(write_ptr, write_info_ptr);
iheight = png_get_image_height(write_ptr, write_info_ptr);
fprintf(STDERR, "Image width = %lu, height = %lu\n",
iwidth, iheight);
}
#endif
png_debug(0, "Destroying data structs\n"); png_debug(0, "Destroying data structs\n");
png_free(read_ptr, row_buf); png_free(read_ptr, row_buf);
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr); png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
@ -590,6 +723,19 @@ main(int argc, char *argv[])
int ierror = 0; int ierror = 0;
fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING); fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION);
/* Do some consistency checking on the memory allocation settings, I'm
not sure this matters, but it is nice to know, the first of these
tests should be impossible because of the way the macros are set
in pngconf.h */
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
#endif
/* I think the following can happen. */
#if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
#endif
if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING)) if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
{ {
@ -602,16 +748,27 @@ main(int argc, char *argv[])
if (argc > 1) if (argc > 1)
{ {
if (strcmp(argv[1], "-m") == 0) if (strcmp(argv[1], "-m") == 0)
multiple = 1; multiple = 1;
else else if (strcmp(argv[1], "-mv") == 0 ||
inname = argv[1]; strcmp(argv[1], "-vm") == 0 )
{
multiple = 1;
verbose = 1;
}
else if (strcmp(argv[1], "-v") == 0)
{
verbose = 1;
inname = argv[2];
}
else
inname = argv[1];
} }
if (!multiple && argc == 3) if (!multiple && argc == 3+verbose)
outname = argv[2]; outname = argv[2+verbose];
if ((!multiple && argc > 3) || (multiple && argc < 2)) if ((!multiple && argc > 3+verbose) || (multiple && argc < 2))
{ {
fprintf(STDERR, fprintf(STDERR,
"usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n", "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
@ -626,31 +783,84 @@ main(int argc, char *argv[])
if (multiple) if (multiple)
{ {
int i; int i;
#ifdef PNGTEST_MEMORY_DEBUG
int allocation_now = current_allocation;
#endif
for (i=2; i<argc; ++i) for (i=2; i<argc; ++i)
{ {
int kerror; int kerror;
fprintf(STDERR, "Testing %s:",argv[i]); fprintf(STDERR, "Testing %s:",argv[i]);
kerror = test_one_file(argv[i], outname); kerror = test_one_file(argv[i], outname);
if (kerror == 0) fprintf(STDERR, " PASS\n"); if (kerror == 0)
fprintf(STDERR, " PASS\n");
else { else {
fprintf(STDERR, " FAIL\n"); fprintf(STDERR, " FAIL\n");
ierror += kerror; ierror += kerror;
} }
#ifdef PNGTEST_MEMORY_DEBUG
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
if (current_allocation != 0) {
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL) {
fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
pinfo = pinfo->next;
}
} }
#endif
}
#ifdef PNGTEST_MEMORY_DEBUG
fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
maximum_allocation);
#endif
} }
else else
{ {
int i; int i;
for (i=0; i<3; ++i) { for (i=0; i<3; ++i) {
int kerror; int kerror;
fprintf(STDERR, "Testing %s:",inname); #ifdef PNGTEST_MEMORY_DEBUG
int allocation_now = current_allocation;
#endif
if (i == 0 || verbose == 1 || ierror != 0)
fprintf(STDERR, "Testing %s:",inname);
kerror = test_one_file(inname, outname); kerror = test_one_file(inname, outname);
if (kerror == 0) fprintf(STDERR, " PASS\n"); if(kerror == 0)
else { {
if(verbose == 1 || i == 2) fprintf(STDERR, " PASS\n");
}
else
{
if(verbose == 0 && i != 2)
fprintf(STDERR, "Testing %s:",inname);
fprintf(STDERR, " FAIL\n"); fprintf(STDERR, " FAIL\n");
ierror += kerror; ierror += kerror;
} }
#ifdef PNGTEST_MEMORY_DEBUG
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
if (current_allocation != 0) {
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL) {
fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
pinfo = pinfo->next;
}
}
fprintf(STDERR, "sbrk(0)=%d\n",sbrk(0));
#endif
} }
#ifdef PNGTEST_MEMORY_DEBUG
fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
maximum_allocation);
#endif
} }
if (ierror == 0) if (ierror == 0)

9
pngtrans.c
View File

@ -1,12 +1,12 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers) /* pngtrans.c - transforms the data in a row (used by both readers and writers)
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -68,7 +68,8 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
} }
#endif #endif
#if defined(PNG_READ_INTERLACING_SUPPORTED) || defined(PNG_WRITE_INTERLACING_SUPPORTED) #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
int int
png_set_interlace_handling(png_structp png_ptr) png_set_interlace_handling(png_structp png_ptr)
{ {
@ -299,7 +300,7 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
png_debug(1, "in png_do_packswap\n"); png_debug(1, "in png_do_packswap\n");
if ( if (
#if defined(PNG_USELESS_TESTS_SUPPORTED) #if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL row != NULL && row_info != NULL &&
#endif #endif
row_info->bit_depth < 8) row_info->bit_depth < 8)
{ {

4
pngwio.c
View File

@ -1,12 +1,12 @@
/* pngwio.c - functions for data output /* pngwio.c - functions for data output
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
* *
* This file provides a location for all output. Users which need * This file provides a location for all output. Users which need
* special handling are expected to write functions which have the same * special handling are expected to write functions which have the same

27
pngwrite.c
View File

@ -1,12 +1,12 @@
/* pngwrite.c - general routines to write a PNG file /* pngwrite.c - general routines to write a PNG file
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
/* get internal access to png.h */ /* get internal access to png.h */
@ -34,7 +34,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
/* write IHDR information. */ /* write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
info_ptr->filter_type, info_ptr->interlace_type); info_ptr->filter_type,
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
info_ptr->interlace_type);
#else
0);
#endif
/* the rest of these check to see if the valid field has the appropriate /* the rest of these check to see if the valid field has the appropriate
flag set, and if it does, writes the chunk. */ flag set, and if it does, writes the chunk. */
#if defined(PNG_WRITE_gAMA_SUPPORTED) #if defined(PNG_WRITE_gAMA_SUPPORTED)
@ -71,9 +76,9 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
if (png_ptr->transformations & PNG_INVERT_ALPHA && if (png_ptr->transformations & PNG_INVERT_ALPHA &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{ {
int i; int j;
for (i=0; i<info_ptr->num_trans; i++) for (j=0; j<info_ptr->num_trans; j++)
info_ptr->trans[i] = 255 - info_ptr->trans[i]; info_ptr->trans[j] = 255 - info_ptr->trans[j];
} }
#endif #endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values), png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
@ -315,7 +320,7 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
/* initialize zbuf - compression buffer */ /* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE; png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size); png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_set_write_fn(png_ptr, NULL, NULL, NULL); png_set_write_fn(png_ptr, NULL, NULL, NULL);
@ -346,7 +351,7 @@ png_write_init(png_structp png_ptr)
/* initialize zbuf - compression buffer */ /* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE; png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size); png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_set_write_fn(png_ptr, NULL, NULL, NULL); png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@ -386,9 +391,13 @@ png_write_image(png_structp png_ptr, png_bytepp image)
png_bytepp rp; /* points to current row */ png_bytepp rp; /* points to current row */
png_debug(1, "in png_write_image\n"); png_debug(1, "in png_write_image\n");
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* intialize interlace handling. If image is not interlaced, /* intialize interlace handling. If image is not interlaced,
this will set pass to 1 */ this will set pass to 1 */
num_pass = png_set_interlace_handling(png_ptr); num_pass = png_set_interlace_handling(png_ptr);
#else
num_pass = 1;
#endif
/* loop through passes */ /* loop through passes */
for (pass = 0; pass < num_pass; pass++) for (pass = 0; pass < num_pass; pass++)
{ {
@ -749,7 +758,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
} }
else else
{ {
png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr, 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; png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
} }

8
pngwtran.c
View File

@ -1,12 +1,12 @@
/* pngwtran.c - transforms the data in a row for PNG writers /* pngwtran.c - transforms the data in a row for PNG writers
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -24,6 +24,10 @@ png_do_write_transformations(png_structp png_ptr)
png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
png_ptr->flags); png_ptr->flags);
#endif #endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED) #if defined(PNG_WRITE_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK) if (png_ptr->transformations & PNG_PACK)
png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,

19
pngwutil.c
View File

@ -1,12 +1,12 @@
/* pngwutil.c - utilities to write a PNG file /* pngwutil.c - utilities to write a PNG file
* *
* libpng 0.98 * libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998 * January 30, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -200,12 +200,16 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
filter_type = PNG_FILTER_TYPE_BASE; filter_type = PNG_FILTER_TYPE_BASE;
} }
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
if (interlace_type != PNG_INTERLACE_NONE && if (interlace_type != PNG_INTERLACE_NONE &&
interlace_type != PNG_INTERLACE_ADAM7) interlace_type != PNG_INTERLACE_ADAM7)
{ {
png_warning(png_ptr, "Invalid interlace type specified"); png_warning(png_ptr, "Invalid interlace type specified");
interlace_type = PNG_INTERLACE_ADAM7; interlace_type = PNG_INTERLACE_ADAM7;
} }
#else
interlace_type=PNG_INTERLACE_NONE;
#endif
/* save off the relevent information */ /* save off the relevent information */
png_ptr->bit_depth = (png_byte)bit_depth; png_ptr->bit_depth = (png_byte)bit_depth;
@ -351,7 +355,7 @@ png_write_sRGB(png_structp png_ptr, int srgb_intent)
png_byte buf[1]; png_byte buf[1];
png_debug(1, "in png_write_sRGB\n"); png_debug(1, "in png_write_sRGB\n");
if(srgb_intent > 3) if(srgb_intent >= PNG_sRGB_INTENT_LAST)
png_warning(png_ptr, png_warning(png_ptr,
"Invalid sRGB rendering intent specified"); "Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent; buf[0]=(png_byte)srgb_intent;
@ -821,7 +825,8 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
} }
/* save the data */ /* save the data */
output_ptr[num_output_ptr] = png_malloc(png_ptr, png_ptr->zbuf_size); output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
png_ptr->zbuf_size);
png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf, png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size); png_ptr->zbuf_size);
num_output_ptr++; num_output_ptr++;
@ -874,7 +879,7 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
} }
/* save off the data */ /* save off the data */
output_ptr[num_output_ptr] = png_malloc(png_ptr, output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
png_ptr->zbuf_size); png_ptr->zbuf_size);
png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf, png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size); png_ptr->zbuf_size);
@ -1098,6 +1103,7 @@ png_write_start_row(png_structp png_ptr)
} }
} }
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* if interlaced, we need to set up width and height of pass */ /* if interlaced, we need to set up width and height of pass */
if (png_ptr->interlaced) if (png_ptr->interlaced)
{ {
@ -1115,6 +1121,7 @@ png_write_start_row(png_structp png_ptr)
} }
} }
else else
#endif
{ {
png_ptr->num_rows = png_ptr->height; png_ptr->num_rows = png_ptr->height;
png_ptr->usr_width = png_ptr->width; png_ptr->usr_width = png_ptr->width;
@ -1137,6 +1144,7 @@ png_write_finish_row(png_structp png_ptr)
if (png_ptr->row_number < png_ptr->num_rows) if (png_ptr->row_number < png_ptr->num_rows)
return; return;
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* if interlaced, go to next pass */ /* if interlaced, go to next pass */
if (png_ptr->interlaced) if (png_ptr->interlaced)
{ {
@ -1178,6 +1186,7 @@ png_write_finish_row(png_structp png_ptr)
return; return;
} }
} }
#endif
/* if we get here, we've just written the last row, so we need /* if we get here, we've just written the last row, so we need
to flush the compressor */ to flush the compressor */