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[libpng17] Use "if (value != 0)" instead of "if (value)" consistently.

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This commit is contained in:
Glenn Randers-Pehrson 2014-03-08 13:25:55 -06:00
parent 88e7d62fbc
commit 4e61b58980
20 changed files with 159 additions and 149 deletions
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5
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.7.0beta34 - February 27, 2014
Libpng 1.7.0beta34 - March 8, 2014
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -565,9 +565,10 @@ Version 1.7.0beta33 [February 27, 2014]
Fixed typos in the manual and in scripts/pnglibconf.dfa (CFLAGS -> CPPFLAGS
and PNG_USR_CONFIG -> PNG_USER_CONFIG).
Version 1.7.0beta34 [February 27, 2014]
Version 1.7.0beta34 [March 8, 2014]
Treat CRC error handling with png_set_crc_action(), instead of with
png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
Use "if (value != 0)" instead of "if (value)" consistently.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

3
CHANGES
View File

@ -4854,9 +4854,10 @@ Version 1.7.0beta33 [February 27, 2014]
Fixed typos in the manual and in scripts/pnglibconf.dfa (CFLAGS -> CPPFLAGS
and PNG_USR_CONFIG -> PNG_USER_CONFIG).
Version 1.7.0beta34 [February 27, 2014]
Version 1.7.0beta34 [March 8, 2014]
Treat CRC error handling with png_set_crc_action(), instead of with
png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
Use "if (value != 0)" instead of "if (value)" consistently.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

2
example.c
View File

@ -970,7 +970,7 @@ void write_png(char *file_name /* , ... other image information ... */)
png_set_packswap(png_ptr);
/* Turn on interlace handling if you are not using png_write_image() */
if (interlacing)
if (interlacing != 0)
number_passes = png_set_interlace_handling(png_ptr);
else

24
libpng-manual.txt
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@ -1,6 +1,6 @@
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.7.0beta34 - February 27, 2014
libpng version 1.7.0beta34 - March 8, 2014
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.7.0beta34 - February 27, 2014
libpng versions 0.97, January 1998, through 1.7.0beta34 - March 8, 2014
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@ -277,8 +277,8 @@ pngusr.dfa in these directories.
C. Configuration using PNG_USER_CONFIG
If -DPNG_USER_CONFIG is added to the CPPFLAGS when pnglibconf.h is built the file
pngusr.h will automatically be included before the options in
If -DPNG_USER_CONFIG is added to the CPPFLAGS when pnglibconf.h is built,
the file pngusr.h will automatically be included before the options in
scripts/pnglibconf.dfa are processed. Your pngusr.h file should contain only
macro definitions turning features on or off or setting settings.
@ -428,7 +428,7 @@ an end_info structure.
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
errors will result in a call to PNG_ABORT which defaults to abort().
You can #define PNG_ABORT to a function or other C code that does something
more useful than abort(), as long as your function does not
@ -1160,7 +1160,7 @@ where row_pointers is an array of pointers to the pixel data for each row:
If you know your image size and pixel size ahead of time, you can allocate
row_pointers prior to calling png_read_png() with
if (height > PNG_UINT_32_MAX/(sizeof (png_byte))
if (height > PNG_UINT_32_MAX/(sizeof (png_byte)))
png_error (png_ptr,
"Image is too tall to process in memory");
@ -2741,8 +2741,7 @@ you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT which defaults to abort().
You can #define PNG_ABORT to a function or other C code that does something
more useful than abort(), as long as your function does not
return.
more useful than abort(), as long as your function does not return.
Checking for invalid palette index on write was added at libpng
1.5.10. If a pixel contains an invalid (out-of-range) index libpng issues
@ -5173,7 +5172,6 @@ The following API are now DEPRECATED:
png_info_init_3()
png_convert_to_rfc1123() which has been replaced
with png_convert_to_rfc1123_buffer()
png_data_freer()
png_malloc_default()
png_free_default()
png_reset_zstream()
@ -5382,6 +5380,9 @@ exported functions are marked with PNGAPI:
body;
}
The return type and decorations are placed on a separate line
ahead of the function name, as illustrated above.
The prototypes for all exported functions appear in png.h,
above the comment that says
@ -5438,6 +5439,9 @@ with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
We prefer to use underscores in variable names rather than camelCase, except
for a few type names that we inherit from zlib.h.
We prefer "if (something != 0)" and "if (something == 0)"
over "if (something)" and if "(!something)", respectively.
We do not use the TAB character for indentation in the C sources.
Lines do not exceed 80 characters.
@ -5446,7 +5450,7 @@ Other rules can be inferred by inspecting the libpng source.
XVII. Y2K Compliance in libpng
February 27, 2014
March 8, 2014
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.

32
libpng.3
View File

@ -1,4 +1,4 @@
.TH LIBPNG 3 "February 27, 2014"
.TH LIBPNG 3 "March 8, 2014"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta34
.SH SYNOPSIS
@ -494,7 +494,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.7.0beta34 - February 27, 2014
libpng version 1.7.0beta34 - March 8, 2014
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@ -505,7 +505,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.7.0beta34 - February 27, 2014
libpng versions 0.97, January 1998, through 1.7.0beta34 - March 8, 2014
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@ -771,8 +771,8 @@ pngusr.dfa in these directories.
C. Configuration using PNG_USER_CONFIG
If \-DPNG_USER_CONFIG is added to the CPPFLAGS when pnglibconf.h is built the file
pngusr.h will automatically be included before the options in
If \-DPNG_USER_CONFIG is added to the CPPFLAGS when pnglibconf.h is built,
the file pngusr.h will automatically be included before the options in
scripts/pnglibconf.dfa are processed. Your pngusr.h file should contain only
macro definitions turning features on or off or setting settings.
@ -922,7 +922,7 @@ an end_info structure.
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
errors will result in a call to PNG_ABORT which defaults to abort().
You can #define PNG_ABORT to a function or other C code that does something
more useful than abort(), as long as your function does not
@ -1654,7 +1654,7 @@ where row_pointers is an array of pointers to the pixel data for each row:
If you know your image size and pixel size ahead of time, you can allocate
row_pointers prior to calling png_read_png() with
if (height > PNG_UINT_32_MAX/(sizeof (png_byte))
if (height > PNG_UINT_32_MAX/(sizeof (png_byte)))
png_error (png_ptr,
"Image is too tall to process in memory");
@ -3235,8 +3235,7 @@ you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT which defaults to abort().
You can #define PNG_ABORT to a function or other C code that does something
more useful than abort(), as long as your function does not
return.
more useful than abort(), as long as your function does not return.
Checking for invalid palette index on write was added at libpng
1.5.10. If a pixel contains an invalid (out-of-range) index libpng issues
@ -5668,7 +5667,6 @@ The following API are now DEPRECATED:
png_info_init_3()
png_convert_to_rfc1123() which has been replaced
with png_convert_to_rfc1123_buffer()
png_data_freer()
png_malloc_default()
png_free_default()
png_reset_zstream()
@ -5877,6 +5875,9 @@ exported functions are marked with PNGAPI:
body;
}
The return type and decorations are placed on a separate line
ahead of the function name, as illustrated above.
The prototypes for all exported functions appear in png.h,
above the comment that says
@ -5933,6 +5934,9 @@ with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
We prefer to use underscores in variable names rather than camelCase, except
for a few type names that we inherit from zlib.h.
We prefer "if (something != 0)" and "if (something == 0)"
over "if (something)" and if "(!something)", respectively.
We do not use the TAB character for indentation in the C sources.
Lines do not exceed 80 characters.
@ -5941,7 +5945,7 @@ Other rules can be inferred by inspecting the libpng source.
.SH XVII. Y2K Compliance in libpng
February 27, 2014
March 8, 2014
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
@ -6211,7 +6215,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.7.0beta34 - February 27, 2014:
Libpng version 1.7.0beta34 - March 8, 2014:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@ -6234,7 +6238,7 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.7.0beta34, February 27, 2014, are
libpng versions 1.2.6, August 15, 2004, through 1.7.0beta34, March 8, 2014, are
Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@ -6333,7 +6337,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
February 27, 2014
March 8, 2014
.\" end of man page

24
png.c
View File

@ -165,7 +165,7 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
int
png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
{
if (user_png_ver)
if (user_png_ver != NULL)
{
int i = 0;
@ -696,13 +696,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.7.0beta34 - February 27, 2014" PNG_STRING_NEWLINE \
"libpng version 1.7.0beta34 - March 8, 2014" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2014 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.7.0beta34 - February 27, 2014\
return "libpng version 1.7.0beta34 - March 8, 2014\
Copyright (c) 1998-2014 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@ -1466,10 +1466,10 @@ png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy)
/* As a side-effect this routine also returns the XYZ endpoints. */
result = png_XYZ_from_xy(XYZ, xy);
if (result) return result;
if (result != 0) return result;
result = png_xy_from_XYZ(&xy_test, XYZ);
if (result) return result;
if (result != 0) return result;
if (png_colorspace_endpoints_match(xy, &xy_test,
5/*actually, the math is pretty accurate*/))
@ -1489,10 +1489,10 @@ png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ)
png_XYZ XYZtemp;
result = png_XYZ_normalize(XYZ);
if (result) return result;
if (result != 0) return result;
result = png_xy_from_XYZ(xy, XYZ);
if (result) return result;
if (result != 0) return result;
XYZtemp = *XYZ;
return png_colorspace_check_xy(&XYZtemp, xy);
@ -1533,7 +1533,7 @@ png_colorspace_set_xy_and_XYZ(png_const_structrp png_ptr,
}
/* Only overwrite with preferred values */
if (!preferred)
if (preferred == 0)
return 1; /* ok, but no change */
}
@ -2644,7 +2644,7 @@ png_pow10(int power)
}
while (power > 0);
if (recip) d = 1/d;
if (recip != 0) d = 1/d;
}
/* else power is 0 and d is 1 */
@ -3175,7 +3175,7 @@ png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
if (s00 >= (D >> 1))
++result;
if (negative)
if (negative != 0)
result = -result;
/* Check for overflow. */
@ -3877,7 +3877,7 @@ png_build_gamma_table(png_structrp png_ptr, png_fixed_point gamma_val,
*/
data.adjust = output > PNG_GAMMA_TABLE_8;
if (use_shift)
if (use_shift != 0)
{
/* The multiplier does the shift: */
data.mult = 1U << (8-input_depth);
@ -3901,7 +3901,7 @@ png_build_gamma_table(png_structrp png_ptr, png_fixed_point gamma_val,
*/
data.adjust = output == PNG_GAMMA_TABLE_8;
if (use_shift)
if (use_shift != 0)
{
data.mult = 1U << (16-input_depth);
data.add = 0;

6
pngerror.c
View File

@ -195,7 +195,7 @@ png_format_number(png_const_charp start, png_charp end, int format,
* drop the decimal point. If the number is a true zero handle that
* here.
*/
if (output)
if (output != 0)
*--end = '.';
else if (number == 0) /* and !output */
*--end = '0';
@ -949,7 +949,7 @@ png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)
saved_error_buf = image->opaque->error_buf;
result = setjmp(safe_jmpbuf) == 0;
if (result)
if (result != 0)
{
image->opaque->error_buf = safe_jmpbuf;
@ -959,7 +959,7 @@ png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)
image->opaque->error_buf = saved_error_buf;
/* And do the cleanup prior to any failure return. */
if (!result)
if (result == 0)
png_image_free(image);
return result;

4
pngget.c
View File

@ -1,8 +1,8 @@
/* pngget.c - retrieval of values from info struct
*
* Last changed in libpng 1.6.1 [March 28, 2013]
* Copyright (c) 1998-2013 Glenn Randers-Pehrson
* Last changed in libpng 1.7.0 [(PENDING RELEASE)]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*

2
pngpread.c
View File

@ -49,7 +49,7 @@ png_process_data_pause(png_structrp png_ptr, int save)
/* It's easiest for the caller if we do the save, then the caller doesn't
* have to supply the same data again:
*/
if (save)
if (save != 0)
png_push_save_buffer(png_ptr);
else
{

28
pngread.c
View File

@ -1788,7 +1788,7 @@ png_create_colormap_entry(png_image_read_control *display,
/* This is set if the color isn't gray but the output is. */
if (encoding == P_LINEAR)
{
if (convert_to_Y)
if (convert_to_Y != 0)
{
/* NOTE: these values are copied from png_do_rgb_to_gray */
png_uint_32 y = (png_uint_32)6968 * red + (png_uint_32)23434 * green +
@ -3586,7 +3586,7 @@ png_image_read_background(png_voidp argument)
component = 0;
outrow[swap_alpha] = (png_uint_16)component;
if (preserve_alpha)
if (preserve_alpha != 0)
outrow[1 ^ swap_alpha] = alpha;
inrow += 2; /* components and alpha channel */
@ -3679,7 +3679,7 @@ png_image_read_direct(png_voidp argument)
png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, input_gamma_default);
}
if (linear)
if (linear != 0)
{
/* If there *is* an alpha channel in the input it must be multiplied
* out; use PNG_ALPHA_STANDARD, otherwise just use PNG_ALPHA_PNG.
@ -3705,7 +3705,7 @@ png_image_read_direct(png_voidp argument)
*
* TODO: fix libpng and remove this.
*/
if (do_local_background)
if (do_local_background != 0)
{
png_fixed_point gtest;
@ -3753,11 +3753,11 @@ png_image_read_direct(png_voidp argument)
*
* TODO: fix libpng and remove this.
*/
if (do_local_background)
if (do_local_background != 0)
do_local_background = 2/*required*/;
/* 16-bit output: just remove the channel */
else if (linear) /* compose on black (well, pre-multiply) */
else if (linear != 0) /* compose on black (well, pre-multiply) */
png_set_strip_alpha(png_ptr);
/* 8-bit output: do an appropriate compose */
@ -3804,7 +3804,7 @@ png_image_read_direct(png_voidp argument)
png_uint_32 filler; /* opaque filler */
int where;
if (linear)
if (linear != 0)
filler = 65535;
else
@ -3877,7 +3877,7 @@ png_image_read_direct(png_voidp argument)
/* If the *output* is 16-bit then we need to check for a byte-swap on this
* architecture.
*/
if (linear)
if (linear != 0)
{
PNG_CONST png_uint_16 le = 0x0001;
@ -3886,7 +3886,7 @@ png_image_read_direct(png_voidp argument)
}
/* If change is not now 0 some transformation is missing - error out. */
if (change)
if (change != 0)
png_error(png_ptr, "png_read_image: unsupported transformation");
}
@ -3898,7 +3898,7 @@ png_image_read_direct(png_voidp argument)
*
* TODO: remove the do_local_background fixup below.
*/
if (!do_local_compose && do_local_background != 2)
if (do_local_compose == 0 && do_local_background != 2)
passes = png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
@ -3912,7 +3912,7 @@ png_image_read_direct(png_voidp argument)
if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
{
/* do_local_compose removes this channel below. */
if (!do_local_compose)
if (do_local_compose == 0)
{
/* do_local_background does the same if required. */
if (do_local_background != 2 ||
@ -3921,7 +3921,7 @@ png_image_read_direct(png_voidp argument)
}
}
else if (do_local_compose) /* internal error */
else if (do_local_compose != 0) /* internal error */
png_error(png_ptr, "png_image_read: alpha channel lost");
if (info_ptr->bit_depth == 16)
@ -3964,7 +3964,7 @@ png_image_read_direct(png_voidp argument)
png_voidp first_row = display->buffer;
ptrdiff_t row_bytes = display->row_stride;
if (linear)
if (linear != 0)
row_bytes *= 2;
/* The following expression is designed to work correctly whether it gives
@ -3981,7 +3981,7 @@ png_image_read_direct(png_voidp argument)
display->row_bytes = row_bytes;
}
if (do_local_compose)
if (do_local_compose != 0)
{
int result;
png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));

2
pngrio.c
View File

@ -1,7 +1,7 @@
/* pngrio.c - functions for data input
*
* Last changed in libpng 1.6.9 [(PENDING RELEASE)]
* Last changed in libpng 1.6.9 [February 6, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

70
pngrtran.c
View File

@ -146,7 +146,7 @@ png_set_background_fixed(png_structrp png_ptr,
png_ptr->background_gamma = background_gamma;
png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
if (need_expand)
if (need_expand != 0)
png_ptr->flags |= PNG_FLAG_BACKGROUND_EXPAND;
else
@ -230,7 +230,7 @@ translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
# else
PNG_UNUSED(png_ptr)
# endif
if (is_screen)
if (is_screen != 0)
output_gamma = PNG_GAMMA_sRGB;
else
output_gamma = PNG_GAMMA_sRGB_INVERSE;
@ -239,7 +239,7 @@ translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
else if (output_gamma == PNG_GAMMA_MAC_18 ||
output_gamma == PNG_FP_1 / PNG_GAMMA_MAC_18)
{
if (is_screen)
if (is_screen != 0)
output_gamma = PNG_GAMMA_MAC_OLD;
else
output_gamma = PNG_GAMMA_MAC_INVERSE;
@ -361,7 +361,7 @@ png_set_alpha_mode_fixed(png_structrp png_ptr, int mode,
/* Finally, if pre-multiplying, set the background fields to achieve the
* desired result.
*/
if (compose)
if (compose != 0)
{
/* And obtain alpha pre-multiplication by composing on black: */
memset(&png_ptr->background, 0, (sizeof png_ptr->background));
@ -418,7 +418,7 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
png_ptr->transformations |= PNG_QUANTIZE;
if (!full_quantize)
if (full_quantize == 0)
{
int i;
@ -473,12 +473,12 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
}
}
if (done)
if (done != 0)
break;
}
/* Swap the palette around, and set up a table, if necessary */
if (full_quantize)
if (full_quantize != 0)
{
int j = num_palette;
@ -661,7 +661,7 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
num_new_palette--;
palette[png_ptr->index_to_palette[j]]
= palette[num_new_palette];
if (!full_quantize)
if (full_quantize == 0)
{
int k;
@ -729,7 +729,7 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
}
png_ptr->num_palette = (png_uint_16)num_palette;
if (full_quantize)
if (full_quantize != 0)
{
int i;
png_bytep distance;
@ -1181,7 +1181,7 @@ png_init_background_transformations(png_structrp png_ptr)
* does not necessarily match the output the application gets, fix that and
* the color type here:
*/
if (!expand)
if (expand == 0)
{
/* The background bit_depth and color_type need correcting */
if ((transform & PNG_EXPAND) != 0)
@ -1372,7 +1372,7 @@ png_init_palette_transformations(png_structrp png_ptr)
}
/* If no alpha we can optimize. */
if (!input_has_alpha)
if (input_has_alpha == 0)
{
/* Any alpha means background and associative alpha processing is
* required, however if the alpha is 0 or 1 throughout OPTIMIZE_ALPHA
@ -1381,7 +1381,7 @@ png_init_palette_transformations(png_structrp png_ptr)
png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
if (!input_has_transparency)
if (input_has_transparency == 0)
png_ptr->transformations &= ~PNG_COMPOSE;
}
}
@ -1397,7 +1397,7 @@ png_init_rgb_transformations(png_structrp png_ptr)
int input_has_transparency = png_ptr->num_trans > 0;
/* If no alpha we can optimize. */
if (!input_has_alpha)
if (input_has_alpha == 0)
{
/* Any alpha means background and associative alpha processing is
* required, however if the alpha is 0 or 1 throughout OPTIMIZE_ALPHA
@ -1408,7 +1408,7 @@ png_init_rgb_transformations(png_structrp png_ptr)
png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
# endif
if (!input_has_transparency)
if (input_has_transparency == 0)
png_ptr->transformations &= ~PNG_COMPOSE;
}
}
@ -1479,7 +1479,7 @@ png_init_read_transformations(png_structrp png_ptr)
* the code immediately below if the transform can be handled outside the
* row loop.
*/
if (gamma_correction)
if (gamma_correction != 0)
png_ptr->transformations |= PNG_GAMMA;
else
@ -2015,7 +2015,7 @@ defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
png_ptr->info_rowbytes = info_ptr->rowbytes;
#ifndef PNG_READ_EXPAND_SUPPORTED
if (png_ptr)
if (png_ptr != NULL)
return;
#endif
}
@ -2174,7 +2174,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row,
have_shift = 1;
}
if (!have_shift)
if (have_shift == 0)
return;
}
@ -2936,7 +2936,7 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
*(dp++) = (png_byte)red;
}
if (have_alpha)
if (have_alpha != 0)
*(dp++) = *(sp++);
}
}
@ -2962,7 +2962,7 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
else
*(dp++) = red;
if (have_alpha)
if (have_alpha != 0)
*(dp++) = *(sp++);
}
}
@ -3012,7 +3012,7 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
*(dp++) = (png_byte)((w>>8) & 0xff);
*(dp++) = (png_byte)(w & 0xff);
if (have_alpha)
if (have_alpha != 0)
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@ -3045,7 +3045,7 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
*(dp++) = (png_byte)((gray16>>8) & 0xff);
*(dp++) = (png_byte)(gray16 & 0xff);
if (have_alpha)
if (have_alpha != 0)
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@ -3111,7 +3111,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
*sp = (png_byte)(tmp & 0xff);
}
if (!bit_shift)
if (bit_shift == 0)
{
bit_shift = 7;
sp++;
@ -3150,7 +3150,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
*sp = (png_byte)(tmp & 0xff);
}
if (!bit_shift)
if (bit_shift == 0)
{
bit_shift = 6;
sp++;
@ -3176,7 +3176,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
*sp = (png_byte)(tmp & 0xff);
}
if (!bit_shift)
if (bit_shift == 0)
{
bit_shift = 6;
sp++;
@ -3216,7 +3216,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
*sp = (png_byte)(tmp & 0xff);
}
if (!bit_shift)
if (bit_shift == 0)
{
bit_shift = 4;
sp++;
@ -3242,7 +3242,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
*sp = (png_byte)(tmp & 0xff);
}
if (!bit_shift)
if (bit_shift == 0)
{
bit_shift = 4;
sp++;
@ -3491,7 +3491,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
png_composite_16(w, v, 257*a,
png_ptr->background_1.gray);
if (!optimize)
if (optimize == 0)
w = gamma_from_1[(w+add)>>shift];
else /* alpha pixels linear and approximate */
@ -3553,7 +3553,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
g = gamma_16_to_1[((sp[0]<<8)+sp[1]+add) >> shift];
png_composite_16(v, g, a, png_ptr->background_1.gray);
if (!optimize)
if (optimize == 0)
w = gamma_16_from_1[(v+add) >> shift];
else
@ -3631,7 +3631,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
png_composite_16(w, v, alpha,
png_ptr->background_1.red);
if (!optimize)
if (optimize == 0)
w = gamma_from_1[(w+add)>>shift];
else
@ -3643,7 +3643,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
png_composite_16(w, v, alpha,
png_ptr->background_1.green);
if (!optimize)
if (optimize == 0)
w = gamma_from_1[(w+add)>>shift];
else
@ -3655,7 +3655,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
png_composite_16(w, v, alpha,
png_ptr->background_1.blue);
if (!optimize)
if (optimize == 0)
w = gamma_from_1[(w+add)>>shift];
else
@ -3743,7 +3743,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
v = gamma_16_to_1[((sp[0]<<8)+sp[1]+add) >> shift];
png_composite_16(w, v, a, png_ptr->background_1.red);
if (!optimize)
if (optimize == 0)
w = gamma_16_from_1[(w+add) >> shift];
*sp = (png_byte)((w >> 8) & 0xff);
@ -3752,7 +3752,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
v = gamma_16_to_1[((sp[2]<<8)+sp[3]+add) >> shift];
png_composite_16(w, v, a, png_ptr->background_1.green);
if (!optimize)
if (optimize == 0)
w = gamma_16_from_1[(w+add) >> shift];
*(sp + 2) = (png_byte)((w >> 8) & 0xff);
@ -3761,7 +3761,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
v = gamma_16_to_1[((sp[4]<<8)+sp[5]+add) >> shift];
png_composite_16(w, v, a, png_ptr->background_1.blue);
if (!optimize)
if (optimize == 0)
w = gamma_16_from_1[(w+add) >> shift];
*(sp + 4) = (png_byte)((w >> 8) & 0xff);
@ -4658,7 +4658,7 @@ png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info)
png_do_rgb_to_gray(png_ptr, row_info,
png_ptr->row_buf + 1);
if (rgb_error)
if (rgb_error != 0)
{
png_ptr->rgb_to_gray_status=1;
if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==

12
pngrutil.c
View File

@ -248,7 +248,7 @@ png_crc_error(png_structrp png_ptr)
/* The chunk CRC must be serialized in a single I/O call. */
png_read_data(png_ptr, crc_bytes, 4);
if (need_crc)
if (need_crc != 0)
{
crc = png_get_uint_32(crc_bytes);
return ((int)(crc != png_ptr->crc));
@ -294,7 +294,7 @@ png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn)
else if (warn < 2) /* else silent */
{
if (warn)
if (warn != 0)
png_chunk_warning(png_ptr, "insufficient memory to read chunk");
else
@ -620,7 +620,7 @@ png_decompress_chunk(png_structrp png_ptr,
{
if (new_size == *newlength)
{
if (terminate)
if (terminate != 0)
text[prefix_size + *newlength] = 0;
if (prefix_size > 0)
@ -1543,7 +1543,7 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
errmsg = "too many profiles";
/* Failure: the reason is in 'errmsg' */
if (!finished)
if (finished == 0)
png_crc_finish(png_ptr, length);
png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
@ -2660,7 +2660,7 @@ png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
buffer[uncompressed_length+prefix_length] = 0;
if (compressed)
if (compressed != 0)
text.compression = PNG_ITXT_COMPRESSION_NONE;
else
@ -3237,7 +3237,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
}
/* Work out the bytes to copy. */
if (display)
if (display != 0)
{
/* When doing the 'block' algorithm the pixel in the pass gets
* replicated to adjacent pixels. This is why the even (0,2,4,6)

12
pngset.c
View File

@ -638,7 +638,7 @@ png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
png_colorspace_sync_info(png_ptr, info_ptr);
/* Don't do any of the copying if the profile was bad, or inconsistent. */
if (!result)
if (result == 0)
return;
/* But do write the gAMA and cHRM chunks from the profile. */
@ -687,7 +687,7 @@ png_set_text(png_structrp png_ptr, png_inforp info_ptr,
int ret;
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
if (ret)
if (ret != 0)
png_error(png_ptr, "Insufficient memory to store text");
}
@ -857,7 +857,7 @@ png_set_text_2(png_structrp png_ptr, png_inforp info_ptr,
textp->text = textp->key + key_len + 1;
}
if (text_length)
if (text_length != 0)
memcpy(textp->text, text_ptr[i].text, text_length);
*(textp->text + text_length) = '\0';
@ -1397,7 +1397,7 @@ png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
* required because add_one_chunk above doesn't extend the list if the 'keep'
* parameter is the default.
*/
if (keep)
if (keep != 0)
{
new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
5 * (num_chunks + old_num_chunks)));
@ -1493,7 +1493,7 @@ png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
info_ptr->row_pointers = row_pointers;
if (row_pointers)
if (row_pointers != NULL)
info_ptr->valid |= PNG_INFO_IDAT;
}
#endif
@ -1607,7 +1607,7 @@ png_set_benign_errors(png_structrp png_ptr, int allowed)
* is the default behavior if png_set_benign_errors() is not called).
*/
if (allowed)
if (allowed != 0)
png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;

40
pngtest.c
View File

@ -1,7 +1,7 @@
/* pngtest.c - a simple test program to test libpng
*
* Last changed in libpng 1.6.9 [(PENDING RELEASE)]
* Last changed in libpng 1.6.11 [(PENDING RELEASE)]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -359,7 +359,7 @@ pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
default:
err = 1; /* uninitialized */
}
if (err)
if (err != 0)
png_error(png_ptr, "Bad I/O state or buffer size");
}
#endif
@ -540,7 +540,7 @@ PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
/* Make sure the caller isn't assuming zeroed memory. */
memset(pinfo->pointer, 0xdd, pinfo->size);
if (verbose)
if (verbose != 0)
printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
pinfo->pointer);
@ -580,7 +580,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
/* We must free the list element too, but first kill
the memory that is to be freed. */
memset(ptr, 0x55, pinfo->size);
if (pinfo)
if (pinfo != NULL)
free(pinfo);
pinfo = NULL;
break;
@ -597,10 +597,10 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
}
/* Finally free the data. */
if (verbose)
if (verbose != 0)
printf("Freeing %p\n", ptr);
if (ptr)
if (ptr != NULL)
free(ptr);
ptr = NULL;
}
@ -667,8 +667,8 @@ set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
return 1; /* handled */
}
static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr,
png_unknown_chunkp chunk)
static int PNGCBAPI
read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk)
{
struct user_chunk_data *my_user_chunk_data =
(struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
@ -734,7 +734,7 @@ write_sTER_chunk(png_structp write_ptr)
{
png_byte sTER[5] = {115, 84, 69, 82, '\0'};
if (verbose)
if (verbose != 0)
fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
@ -747,7 +747,7 @@ write_vpAg_chunk(png_structp write_ptr)
png_byte vpag_chunk_data[9];
if (verbose)
if (verbose != 0)
fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
(unsigned long)user_chunk_data.vpAg_width,
(unsigned long)user_chunk_data.vpAg_height,
@ -938,7 +938,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif
#endif
if (strict)
if (strict != 0)
{
/* Treat png_benign_error() as errors on read */
png_set_benign_errors(read_ptr, 0);
@ -954,7 +954,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
*/
}
else if (relaxed)
else if (relaxed != 0)
{
/* Allow application (pngtest) errors and warnings to pass */
png_set_benign_errors(read_ptr, 1);
@ -1254,7 +1254,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
pngtest_check_text_support(read_ptr, text_ptr, num_text);
if (verbose)
if (verbose != 0)
{
int i;
@ -1320,7 +1320,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
&unknowns);
if (num_unknowns)
if (num_unknowns != 0)
{
png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
num_unknowns);
@ -1436,7 +1436,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
pngtest_check_text_support(read_ptr, text_ptr, num_text);
if (verbose)
if (verbose != 0)
{
int i;
@ -1480,7 +1480,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
&unknowns);
if (num_unknowns)
if (num_unknowns != 0)
{
png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
num_unknowns);
@ -1521,7 +1521,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif
#ifdef PNG_EASY_ACCESS_SUPPORTED
if (verbose)
if (verbose != 0)
{
png_uint_32 iwidth, iheight;
iwidth = png_get_image_width(write_ptr, write_info_ptr);
@ -1599,7 +1599,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
#ifdef PNG_WRITE_SUPPORTED /* else nothing was written */
if (interlace_preserved) /* else the files will be changed */
if (interlace_preserved != 0) /* else the files will be changed */
{
for (;;)
{
@ -1638,7 +1638,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
return (0);
}
if (!num_in)
if (num_in == 0)
break;
if (memcmp(inbuf, outbuf, num_in))
@ -1795,7 +1795,7 @@ main(int argc, char *argv[])
exit(1);
}
if (multiple)
if (multiple != 0)
{
int i;
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG

10
pngtrans.c
View File

@ -1,7 +1,7 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Last changed in libpng 1.6.9 [(PENDING RELEASE)]
* Last changed in libpng 1.6.11 [(PENDING RELEASE)]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -503,7 +503,7 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
{
if (row_info->bit_depth == 8)
{
if (at_start) /* Skip initial filler */
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channel and, for sp, the filler */
sp += 2, ++dp;
@ -517,7 +517,7 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
else if (row_info->bit_depth == 16)
{
if (at_start) /* Skip initial filler */
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channel and, for sp, the filler */
sp += 4, dp += 2;
@ -543,7 +543,7 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
{
if (row_info->bit_depth == 8)
{
if (at_start) /* Skip initial filler */
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channels and, for sp, the filler */
sp += 4, dp += 3;
@ -557,7 +557,7 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
else if (row_info->bit_depth == 16)
{
if (at_start) /* Skip initial filler */
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channels and, for sp, the filler */
sp += 8, dp += 6;

2
pngwio.c
View File

@ -1,7 +1,7 @@
/* pngwio.c - functions for data output
*
* Last changed in libpng 1.6.9 [(PENDING RELEASE)]
* Last changed in libpng 1.6.9 [February 6, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

12
pngwrite.c
View File

@ -832,7 +832,7 @@ png_write_row(png_structrp png_ptr, png_const_bytep row)
{
png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
/* This should always get caught above, but still ... */
if (!(row_info.width))
if (row_info.width == 0)
{
png_write_finish_row(png_ptr);
return;
@ -2163,7 +2163,7 @@ png_image_write_main(png_voidp argument)
* write an interlaced image.
*/
if (write_16bit)
if (write_16bit != 0)
{
/* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */
png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR);
@ -2195,7 +2195,7 @@ png_image_write_main(png_voidp argument)
*
* First check for a little endian system if writing 16 bit files.
*/
if (write_16bit)
if (write_16bit != 0)
{
PNG_CONST png_uint_16 le = 0x0001;
@ -2236,7 +2236,7 @@ png_image_write_main(png_voidp argument)
png_const_bytep row = png_voidcast(png_const_bytep, display->buffer);
ptrdiff_t row_bytes = display->row_stride;
if (linear)
if (linear != 0)
row_bytes *= (sizeof (png_uint_16));
if (row_bytes < 0)
@ -2269,7 +2269,7 @@ png_image_write_main(png_voidp argument)
int result;
display->local_row = row;
if (write_16bit)
if (write_16bit != 0)
result = png_safe_execute(image, png_write_image_16bit, display);
else
result = png_safe_execute(image, png_write_image_8bit, display);
@ -2278,7 +2278,7 @@ png_image_write_main(png_voidp argument)
png_free(png_ptr, row);
/* Skip the 'write_end' on error: */
if (!result)
if (result == 0)
return 0;
}

2
pngwtran.c
View File

@ -1,7 +1,7 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
* Last changed in libpng 1.6.9 [(PENDING RELEASE)]
* Last changed in libpng 1.6.9 [February 6, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

16
pngwutil.c
View File

@ -699,7 +699,7 @@ png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
*new_key++ = ch, ++key_len, space = 0;
else if (!space)
else if (space == 0)
{
/* A space or an invalid character when one wasn't seen immediately
* before; output just a space.
@ -711,14 +711,14 @@ png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
bad_character = ch;
}
else if (!bad_character)
else if (bad_character == 0)
bad_character = ch; /* just skip it, record the first error */
}
if (key_len > 0 && space) /* trailing space */
{
--key_len, --new_key;
if (!bad_character)
if (bad_character == 0)
bad_character = 32;
}
@ -732,7 +732,7 @@ png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
if (*key) /* keyword too long */
png_warning(png_ptr, "keyword truncated");
else if (bad_character)
else if (bad_character != 0)
{
PNG_WARNING_PARAMETERS(p)
@ -898,7 +898,7 @@ png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height,
/* Write the chunk */
png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
if (!(png_ptr->do_filter))
if ((png_ptr->do_filter) == PNG_NO_FILTERS)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
png_ptr->bit_depth < 8)
@ -1612,7 +1612,7 @@ png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text,
*/
png_write_chunk_data(png_ptr, new_key, key_len + 1);
if (text_len)
if (text_len != 0)
png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len);
png_write_chunk_end(png_ptr);
@ -1738,7 +1738,7 @@ png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key,
png_text_compress_init(&comp, (png_const_bytep)text, strlen(text));
if (compression)
if (compression != 0)
{
if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg);
@ -1761,7 +1761,7 @@ png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key,
png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len);
if (compression)
if (compression != 0)
png_write_compressed_data_out(png_ptr, &comp);
else