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libpng/pngset.c
John Bowler 4a6c6df6c7 [libpng16] Allow fine grain control of unknown chunk APIs. This change allows 
png_set_keep_unknown_chunks() to be turned off if not required and causes
both read and write to behave appropriately (on read this is only possible
if the user callback is used to handle unknown chunks).  The change
also removes the support for storing unknown chunks in the info_struct
if the only unknown handling enabled is via the callback, allowing libpng
to be configured with callback reading and none of the unnecessary code.
2012-08-16 16:12:13 -05:00

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/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.6.0 [(PENDING RELEASE)]
* Copyright (c) 1998-2012 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.)
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* 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 for writing into the file. This abstracts the
* info struct and allows us to change the structure in the future.
*/
#include "pngpriv.h"
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#ifdef PNG_bKGD_SUPPORTED
void PNGAPI
png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_color_16p background)
{
png_debug1(1, "in %s storage function", "bKGD");
if (png_ptr == NULL || info_ptr == NULL || background == NULL)
return;
info_ptr->background = *background;
info_ptr->valid |= PNG_INFO_bKGD;
}
#endif
#ifdef PNG_cHRM_SUPPORTED
void PNGFAPI
png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
png_fixed_point blue_x, png_fixed_point blue_y)
{
png_xy xy;
png_debug1(1, "in %s storage function", "cHRM fixed");
if (png_ptr == NULL || info_ptr == NULL)
return;
xy.redx = red_x;
xy.redy = red_y;
xy.greenx = green_x;
xy.greeny = green_y;
xy.bluex = blue_x;
xy.bluey = blue_y;
xy.whitex = white_x;
xy.whitey = white_y;
if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
2/* override with app values*/))
info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
png_colorspace_sync_info(png_ptr, info_ptr);
}
void PNGFAPI
png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
png_fixed_point int_red_X, png_fixed_point int_red_Y,
png_fixed_point int_red_Z, png_fixed_point int_green_X,
png_fixed_point int_green_Y, png_fixed_point int_green_Z,
png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
png_fixed_point int_blue_Z)
{
png_XYZ XYZ;
png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
if (png_ptr == NULL || info_ptr == NULL)
return;
XYZ.redX = int_red_X;
XYZ.redY = int_red_Y;
XYZ.redZ = int_red_Z;
XYZ.greenX = int_green_X;
XYZ.greenY = int_green_Y;
XYZ.greenZ = int_green_Z;
XYZ.blueX = int_blue_X;
XYZ.blueY = int_blue_Y;
XYZ.blueZ = int_blue_Z;
if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2))
info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
png_colorspace_sync_info(png_ptr, info_ptr);
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
double white_x, double white_y, double red_x, double red_y,
double green_x, double green_y, double blue_x, double blue_y)
{
png_set_cHRM_fixed(png_ptr, info_ptr,
png_fixed(png_ptr, white_x, "cHRM White X"),
png_fixed(png_ptr, white_y, "cHRM White Y"),
png_fixed(png_ptr, red_x, "cHRM Red X"),
png_fixed(png_ptr, red_y, "cHRM Red Y"),
png_fixed(png_ptr, green_x, "cHRM Green X"),
png_fixed(png_ptr, green_y, "cHRM Green Y"),
png_fixed(png_ptr, blue_x, "cHRM Blue X"),
png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
}
void PNGAPI
png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
double blue_X, double blue_Y, double blue_Z)
{
png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
png_fixed(png_ptr, red_X, "cHRM Red X"),
png_fixed(png_ptr, red_Y, "cHRM Red Y"),
png_fixed(png_ptr, red_Z, "cHRM Red Z"),
png_fixed(png_ptr, green_X, "cHRM Red X"),
png_fixed(png_ptr, green_Y, "cHRM Red Y"),
png_fixed(png_ptr, green_Z, "cHRM Red Z"),
png_fixed(png_ptr, blue_X, "cHRM Red X"),
png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
}
# endif /* PNG_FLOATING_POINT_SUPPORTED */
#endif /* PNG_cHRM_SUPPORTED */
#ifdef PNG_gAMA_SUPPORTED
void PNGFAPI
png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
png_fixed_point file_gamma)
{
png_debug1(1, "in %s storage function", "gAMA");
if (png_ptr == NULL || info_ptr == NULL)
return;
/* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
* occur. Since the fixed point representation is assymetrical it is
* possible for 1/gamma to overflow the limit of 21474 and this means the
* gamma value must be at least 5/100000 and hence at most 20000.0. For
* safety the limits here are a little narrower. The values are 0.00016 to
* 6250.0, which are truly ridiculous gamma values (and will produce
* displays that are all black or all white.)
*/
if (file_gamma < 16 || file_gamma > 625000000)
png_app_error(png_ptr, "Out of range gamma value ignored");
else
{
if (png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma,
2/* overrided with app value */))
info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_gAMA;
png_colorspace_sync_info(png_ptr, info_ptr);
}
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
{
png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
"png_set_gAMA"));
}
# endif
#endif
#ifdef PNG_hIST_SUPPORTED
void PNGAPI
png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_uint_16p hist)
{
int i;
png_debug1(1, "in %s storage function", "hIST");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->num_palette == 0 || info_ptr->num_palette
> PNG_MAX_PALETTE_LENGTH)
{
png_warning(png_ptr,
"Invalid palette size, hIST allocation skipped");
return;
}
png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
* version 1.2.1
*/
info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
if (info_ptr->hist == NULL)
{
png_warning(png_ptr, "Insufficient memory for hIST chunk data");
return;
}
info_ptr->free_me |= PNG_FREE_HIST;
for (i = 0; i < info_ptr->num_palette; i++)
info_ptr->hist[i] = hist[i];
info_ptr->valid |= PNG_INFO_hIST;
}
#endif
void PNGAPI
png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
png_uint_32 width, png_uint_32 height, int bit_depth,
int color_type, int interlace_type, int compression_type,
int filter_type)
{
png_debug1(1, "in %s storage function", "IHDR");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->width = width;
info_ptr->height = height;
info_ptr->bit_depth = (png_byte)bit_depth;
info_ptr->color_type = (png_byte)color_type;
info_ptr->compression_type = (png_byte)compression_type;
info_ptr->filter_type = (png_byte)filter_type;
info_ptr->interlace_type = (png_byte)interlace_type;
png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
info_ptr->compression_type, info_ptr->filter_type);
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
info_ptr->channels = 1;
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
info_ptr->channels = 3;
else
info_ptr->channels = 1;
if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
info_ptr->channels++;
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
/* Check for potential overflow */
if (width >
(PNG_UINT_32_MAX >> 3) /* 8-byte RRGGBBAA pixels */
- 48 /* bigrowbuf hack */
- 1 /* filter byte */
- 7*8 /* rounding of width to multiple of 8 pixels */
- 8) /* extra max_pixel_depth pad */
info_ptr->rowbytes = 0;
else
info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
}
#ifdef PNG_oFFs_SUPPORTED
void PNGAPI
png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
png_int_32 offset_x, png_int_32 offset_y, int unit_type)
{
png_debug1(1, "in %s storage function", "oFFs");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->x_offset = offset_x;
info_ptr->y_offset = offset_y;
info_ptr->offset_unit_type = (png_byte)unit_type;
info_ptr->valid |= PNG_INFO_oFFs;
}
#endif
#ifdef PNG_pCAL_SUPPORTED
void PNGAPI
png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
int nparams, png_const_charp units, png_charpp params)
{
png_size_t length;
int i;
png_debug1(1, "in %s storage function", "pCAL");
if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
|| (nparams > 0 && params == NULL))
return;
length = strlen(purpose) + 1;
png_debug1(3, "allocating purpose for info (%lu bytes)",
(unsigned long)length);
/* TODO: validate format of calibration name and unit name */
/* Check that the type matches the specification. */
if (type < 0 || type > 3)
png_error(png_ptr, "Invalid pCAL equation type");
if (nparams < 0 || nparams > 255)
png_error(png_ptr, "Invalid pCAL parameter count");
/* Validate params[nparams] */
for (i=0; i<nparams; ++i)
if (params[i] == NULL ||
!png_check_fp_string(params[i], strlen(params[i])))
png_error(png_ptr, "Invalid format for pCAL parameter");
info_ptr->pcal_purpose = png_voidcast(png_charp,
png_malloc_warn(png_ptr, length));
if (info_ptr->pcal_purpose == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL purpose");
return;
}
memcpy(info_ptr->pcal_purpose, purpose, length);
png_debug(3, "storing X0, X1, type, and nparams in info");
info_ptr->pcal_X0 = X0;
info_ptr->pcal_X1 = X1;
info_ptr->pcal_type = (png_byte)type;
info_ptr->pcal_nparams = (png_byte)nparams;
length = strlen(units) + 1;
png_debug1(3, "allocating units for info (%lu bytes)",
(unsigned long)length);
info_ptr->pcal_units = png_voidcast(png_charp,
png_malloc_warn(png_ptr, length));
if (info_ptr->pcal_units == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL units");
return;
}
memcpy(info_ptr->pcal_units, units, length);
info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
(png_size_t)((nparams + 1) * (sizeof (png_charp)))));
if (info_ptr->pcal_params == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL params");
return;
}
memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
for (i = 0; i < nparams; i++)
{
length = strlen(params[i]) + 1;
png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
(unsigned long)length);
info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
if (info_ptr->pcal_params[i] == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL parameter");
return;
}
memcpy(info_ptr->pcal_params[i], params[i], length);
}
info_ptr->valid |= PNG_INFO_pCAL;
info_ptr->free_me |= PNG_FREE_PCAL;
}
#endif
#ifdef PNG_sCAL_SUPPORTED
void PNGAPI
png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
int unit, png_const_charp swidth, png_const_charp sheight)
{
png_size_t lengthw = 0, lengthh = 0;
png_debug1(1, "in %s storage function", "sCAL");
if (png_ptr == NULL || info_ptr == NULL)
return;
/* Double check the unit (should never get here with an invalid
* unit unless this is an API call.)
*/
if (unit != 1 && unit != 2)
png_error(png_ptr, "Invalid sCAL unit");
if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
png_error(png_ptr, "Invalid sCAL width");
if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
png_error(png_ptr, "Invalid sCAL height");
info_ptr->scal_unit = (png_byte)unit;
++lengthw;
png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
info_ptr->scal_s_width = png_voidcast(png_charp,
png_malloc_warn(png_ptr, lengthw));
if (info_ptr->scal_s_width == NULL)
{
png_warning(png_ptr, "Memory allocation failed while processing sCAL");
return;
}
memcpy(info_ptr->scal_s_width, swidth, lengthw);
++lengthh;
png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
info_ptr->scal_s_height = png_voidcast(png_charp,
png_malloc_warn(png_ptr, lengthh));
if (info_ptr->scal_s_height == NULL)
{
png_free (png_ptr, info_ptr->scal_s_width);
info_ptr->scal_s_width = NULL;
png_warning(png_ptr, "Memory allocation failed while processing sCAL");
return;
}
memcpy(info_ptr->scal_s_height, sheight, lengthh);
info_ptr->valid |= PNG_INFO_sCAL;
info_ptr->free_me |= PNG_FREE_SCAL;
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
double width, double height)
{
png_debug1(1, "in %s storage function", "sCAL");
/* Check the arguments. */
if (width <= 0)
png_warning(png_ptr, "Invalid sCAL width ignored");
else if (height <= 0)
png_warning(png_ptr, "Invalid sCAL height ignored");
else
{
/* Convert 'width' and 'height' to ASCII. */
char swidth[PNG_sCAL_MAX_DIGITS+1];
char sheight[PNG_sCAL_MAX_DIGITS+1];
png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
PNG_sCAL_PRECISION);
png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
PNG_sCAL_PRECISION);
png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
}
}
# endif
# ifdef PNG_FIXED_POINT_SUPPORTED
void PNGAPI
png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
png_fixed_point width, png_fixed_point height)
{
png_debug1(1, "in %s storage function", "sCAL");
/* Check the arguments. */
if (width <= 0)
png_warning(png_ptr, "Invalid sCAL width ignored");
else if (height <= 0)
png_warning(png_ptr, "Invalid sCAL height ignored");
else
{
/* Convert 'width' and 'height' to ASCII. */
char swidth[PNG_sCAL_MAX_DIGITS+1];
char sheight[PNG_sCAL_MAX_DIGITS+1];
png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
}
}
# endif
#endif
#ifdef PNG_pHYs_SUPPORTED
void PNGAPI
png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
png_uint_32 res_x, png_uint_32 res_y, int unit_type)
{
png_debug1(1, "in %s storage function", "pHYs");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->x_pixels_per_unit = res_x;
info_ptr->y_pixels_per_unit = res_y;
info_ptr->phys_unit_type = (png_byte)unit_type;
info_ptr->valid |= PNG_INFO_pHYs;
}
#endif
void PNGAPI
png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_const_colorp palette, int num_palette)
{
png_debug1(1, "in %s storage function", "PLTE");
if (png_ptr == NULL || info_ptr == NULL || palette == NULL)
return;
if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
png_error(png_ptr, "Invalid palette length");
else
{
png_warning(png_ptr, "Invalid palette length");
return;
}
}
/* It may not actually be necessary to set png_ptr->palette here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
*
* 1.6.0: the above statement appears to be incorrect; something has to set
* the palette inside png_struct on read.
*/
png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
/* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
* of num_palette entries, in case of an invalid PNG file that has
* too-large sample values.
*/
png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
info_ptr->palette = png_ptr->palette;
info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
info_ptr->free_me |= PNG_FREE_PLTE;
info_ptr->valid |= PNG_INFO_PLTE;
}
#ifdef PNG_sBIT_SUPPORTED
void PNGAPI
png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_color_8p sig_bit)
{
png_debug1(1, "in %s storage function", "sBIT");
if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
return;
info_ptr->sig_bit = *sig_bit;
info_ptr->valid |= PNG_INFO_sBIT;
}
#endif
#ifdef PNG_sRGB_SUPPORTED
void PNGAPI
png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
{
png_debug1(1, "in %s storage function", "sRGB");
if (png_ptr == NULL || info_ptr == NULL)
return;
(void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent,
2/* app value overrides*/);
png_colorspace_sync_info(png_ptr, info_ptr);
}
void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
int srgb_intent)
{
png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent,
2/* app value overrides*/))
{
/* And cause the gAMA and cHRM to be written too */
info_ptr->colorspace.flags |=
PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
}
png_colorspace_sync_info(png_ptr, info_ptr);
}
#endif /* sRGB */
#ifdef PNG_iCCP_SUPPORTED
void PNGAPI
png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_charp name, int compression_type,
png_const_bytep profile, png_uint_32 proflen)
{
png_charp new_iccp_name;
png_bytep new_iccp_profile;
png_size_t length;
png_debug1(1, "in %s storage function", "iCCP");
if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
return;
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
png_app_error(png_ptr, "Invalid iCCP compression method");
/* Set the colorspace first because this validates the profile; do not
* override previously set app cHRM or gAMA here (because likely as not the
* application knows better than libpng what the correct values are.)
*/
{
int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
proflen, profile, 0/* do *not* override the app cHRM or gAMA */);
png_colorspace_sync_info(png_ptr, info_ptr);
/* Don't do any of the copying if the profile was bad, or inconsistent. */
if (!result)
return;
/* But do write the gAMA and cHRM chunks from the profile. */
info_ptr->colorspace.flags |=
PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
}
length = strlen(name)+1;
new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
if (new_iccp_name == NULL)
{
png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
return;
}
memcpy(new_iccp_name, name, length);
new_iccp_profile = png_voidcast(png_bytep,
png_malloc_warn(png_ptr, proflen));
if (new_iccp_profile == NULL)
{
png_free(png_ptr, new_iccp_name);
png_benign_error(png_ptr,
"Insufficient memory to process iCCP profile");
return;
}
memcpy(new_iccp_profile, profile, proflen);
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
info_ptr->iccp_proflen = proflen;
info_ptr->iccp_name = new_iccp_name;
info_ptr->iccp_profile = new_iccp_profile;
info_ptr->free_me |= PNG_FREE_ICCP;
info_ptr->valid |= PNG_INFO_iCCP;
}
#endif
#ifdef PNG_TEXT_SUPPORTED
void PNGAPI
png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_textp text_ptr, int num_text)
{
int ret;
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
if (ret)
png_error(png_ptr, "Insufficient memory to store text");
}
int /* PRIVATE */
png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_textp text_ptr, int num_text)
{
int i;
png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
(unsigned long)png_ptr->chunk_name);
if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
return(0);
/* Make sure we have enough space in the "text" array in info_struct
* to hold all of the incoming text_ptr objects.
*/
if (info_ptr->num_text + num_text > info_ptr->max_text)
{
int old_max_text = info_ptr->max_text;
int old_num_text = info_ptr->num_text;
if (info_ptr->text != NULL)
{
png_textp old_text;
info_ptr->max_text = info_ptr->num_text + num_text + 8;
old_text = info_ptr->text;
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_size_t)(info_ptr->max_text * (sizeof (png_text))));
if (info_ptr->text == NULL)
{
/* Restore to previous condition */
info_ptr->max_text = old_max_text;
info_ptr->text = old_text;
return(1);
}
memcpy(info_ptr->text, old_text, (png_size_t)(old_max_text *
(sizeof (png_text))));
png_free(png_ptr, old_text);
}
else
{
info_ptr->max_text = num_text + 8;
info_ptr->num_text = 0;
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_size_t)(info_ptr->max_text * (sizeof (png_text))));
if (info_ptr->text == NULL)
{
/* Restore to previous condition */
info_ptr->num_text = old_num_text;
info_ptr->max_text = old_max_text;
return(1);
}
info_ptr->free_me |= PNG_FREE_TEXT;
}
png_debug1(3, "allocated %d entries for info_ptr->text",
info_ptr->max_text);
}
for (i = 0; i < num_text; i++)
{
png_size_t text_length, key_len;
png_size_t lang_len, lang_key_len;
png_textp textp = &(info_ptr->text[info_ptr->num_text]);
if (text_ptr[i].key == NULL)
continue;
if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
{
png_warning(png_ptr, "text compression mode is out of range");
continue;
}
key_len = strlen(text_ptr[i].key);
if (text_ptr[i].compression <= 0)
{
lang_len = 0;
lang_key_len = 0;
}
else
# ifdef PNG_iTXt_SUPPORTED
{
/* Set iTXt data */
if (text_ptr[i].lang != NULL)
lang_len = strlen(text_ptr[i].lang);
else
lang_len = 0;
if (text_ptr[i].lang_key != NULL)
lang_key_len = strlen(text_ptr[i].lang_key);
else
lang_key_len = 0;
}
# else /* PNG_iTXt_SUPPORTED */
{
png_warning(png_ptr, "iTXt chunk not supported");
continue;
}
# endif
if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
{
text_length = 0;
# ifdef PNG_iTXt_SUPPORTED
if (text_ptr[i].compression > 0)
textp->compression = PNG_ITXT_COMPRESSION_NONE;
else
# endif
textp->compression = PNG_TEXT_COMPRESSION_NONE;
}
else
{
text_length = strlen(text_ptr[i].text);
textp->compression = text_ptr[i].compression;
}
textp->key = (png_charp)png_malloc_warn(png_ptr,
(png_size_t)
(key_len + text_length + lang_len + lang_key_len + 4));
if (textp->key == NULL)
return(1);
png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
(unsigned long)(png_uint_32)
(key_len + lang_len + lang_key_len + text_length + 4),
textp->key);
memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
*(textp->key + key_len) = '\0';
if (text_ptr[i].compression > 0)
{
textp->lang = textp->key + key_len + 1;
memcpy(textp->lang, text_ptr[i].lang, lang_len);
*(textp->lang + lang_len) = '\0';
textp->lang_key = textp->lang + lang_len + 1;
memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
*(textp->lang_key + lang_key_len) = '\0';
textp->text = textp->lang_key + lang_key_len + 1;
}
else
{
textp->lang=NULL;
textp->lang_key=NULL;
textp->text = textp->key + key_len + 1;
}
if (text_length)
memcpy(textp->text, text_ptr[i].text,
(png_size_t)(text_length));
*(textp->text + text_length) = '\0';
# ifdef PNG_iTXt_SUPPORTED
if (textp->compression > 0)
{
textp->text_length = 0;
textp->itxt_length = text_length;
}
else
# endif
{
textp->text_length = text_length;
textp->itxt_length = 0;
}
info_ptr->num_text++;
png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
}
return(0);
}
#endif
#ifdef PNG_tIME_SUPPORTED
void PNGAPI
png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
png_const_timep mod_time)
{
png_debug1(1, "in %s storage function", "tIME");
if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
(png_ptr->mode & PNG_WROTE_tIME))
return;
if (mod_time->month == 0 || mod_time->month > 12 ||
mod_time->day == 0 || mod_time->day > 31 ||
mod_time->hour > 23 || mod_time->minute > 59 ||
mod_time->second > 60)
{
png_warning(png_ptr, "Ignoring invalid time value");
return;
}
info_ptr->mod_time = *mod_time;
info_ptr->valid |= PNG_INFO_tIME;
}
#endif
#ifdef PNG_tRNS_SUPPORTED
void PNGAPI
png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
{
png_debug1(1, "in %s storage function", "tRNS");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (trans_alpha != NULL)
{
/* It may not actually be necessary to set png_ptr->trans_alpha here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
*
* 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
* relies on png_set_tRNS storing the information in png_struct
* (otherwise it won't be there for the code in pngrtran.c).
*/
png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
}
if (trans_color != NULL)
{
int sample_max = (1 << info_ptr->bit_depth);
if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
trans_color->gray > sample_max) ||
(info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
(trans_color->red > sample_max ||
trans_color->green > sample_max ||
trans_color->blue > sample_max)))
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
info_ptr->trans_color = *trans_color;
if (num_trans == 0)
num_trans = 1;
}
info_ptr->num_trans = (png_uint_16)num_trans;
if (num_trans != 0)
{
info_ptr->valid |= PNG_INFO_tRNS;
info_ptr->free_me |= PNG_FREE_TRNS;
}
}
#endif
#ifdef PNG_sPLT_SUPPORTED
void PNGAPI
png_set_sPLT(png_const_structrp png_ptr,
png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
/*
* entries - array of png_sPLT_t structures
* to be added to the list of palettes
* in the info structure.
*
* nentries - number of palette structures to be
* added.
*/
{
png_sPLT_tp np;
int i;
if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 ||
entries == NULL)
return;
np = png_voidcast(png_sPLT_tp, png_malloc_warn(png_ptr,
(info_ptr->splt_palettes_num + nentries) * (sizeof (png_sPLT_t))));
if (np == NULL)
{
png_warning(png_ptr, "No memory for sPLT palettes");
return;
}
memcpy(np, info_ptr->splt_palettes,
info_ptr->splt_palettes_num * (sizeof (png_sPLT_t)));
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes=NULL;
/* TODO: fix this, it apparently leaves NULL entries in the event of OOM
* below.
*/
for (i = 0; i < nentries; i++)
{
png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
png_const_sPLT_tp from = entries + i;
png_size_t length;
/* In event of error below the name and entries fields must be set to
* NULL, otherwise libpng will crash later on while trying to free the
* uninitialized pointers.
*/
memset(to, 0, (sizeof *to));
if (from->name == NULL || from->entries == NULL)
continue;
length = strlen(from->name) + 1;
to->name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
if (to->name == NULL)
{
png_warning(png_ptr,
"Out of memory while processing sPLT chunk");
continue;
}
memcpy(to->name, from->name, length);
to->entries = png_voidcast(png_sPLT_entryp, png_malloc_warn(png_ptr,
from->nentries * (sizeof (png_sPLT_entry))));
if (to->entries == NULL)
{
png_warning(png_ptr, "Out of memory while processing sPLT chunk");
png_free(png_ptr, to->name);
to->name = NULL;
continue;
}
memcpy(to->entries, from->entries,
from->nentries * (sizeof (png_sPLT_entry)));
to->nentries = from->nentries;
to->depth = from->depth;
}
info_ptr->splt_palettes = np;
info_ptr->splt_palettes_num += nentries;
info_ptr->valid |= PNG_INFO_sPLT;
info_ptr->free_me |= PNG_FREE_SPLT;
}
#endif /* PNG_sPLT_SUPPORTED */
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
static png_byte
check_location(png_const_structrp png_ptr, unsigned int location)
{
location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
/* New in 1.6.0; copy the location and check it. This is an API
* change, previously the app had to use the
* png_set_unknown_chunk_location API below for each chunk.
*/
if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))
{
/* Write struct, so unknown chunks come from the app */
png_app_warning(png_ptr,
"png_set_unknown_chunks now expects a valid location");
/* Use the old behavior */
location = png_ptr->mode &
(PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
}
if (location == 0)
png_error(png_ptr, "invalid location in png_set_unknown_chunks");
/* Now reduce the location to the top-most set bit by removing each least
* significant bit in turn.
*/
while (location != (location & -location))
location &= (png_byte)~(location & -location);
/* The cast is safe because 'location' is a bit mask and only the low four
* bits are significant.
*/
return (png_byte)location;
}
void PNGAPI
png_set_unknown_chunks(png_const_structrp png_ptr,
png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
{
png_unknown_chunkp np;
if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0)
return;
/* Check for the failure cases where support has been disabled at compile
* time. This code is hardly ever compiled - it's here because
* STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
* code) but may be meaningless if the read or write handling of unknown
* chunks is not compiled in.
*/
# if !(defined PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
(defined PNG_READ_SUPPORTED)
if (png_ptr->mode & PNG_IS_READ_STRUCT)
{
png_app_error(png_ptr, "no unknown chunk support on read");
return;
}
# endif
# if !(defined PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
(defined PNG_WRITE_SUPPORTED)
if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
{
png_app_error(png_ptr, "no unknown chunk support on write");
return;
}
# endif
/* Prior to 1.6.0 this code used png_malloc_warn, however this meant that
* unknown critical chunks could be lost with just a warning resulting in
* undefined behavior. Changing to png_malloc fixes this by producing a
* png_error. The (png_size_t) cast was also removed as it hides a potential
* overflow.
*
* TODO: fix the potential overflow in the multiply
*/
np = png_voidcast(png_unknown_chunkp, png_malloc(png_ptr,
(info_ptr->unknown_chunks_num + (unsigned int)num_unknowns) *
(sizeof (png_unknown_chunk))));
memcpy(np, info_ptr->unknown_chunks,
info_ptr->unknown_chunks_num * (sizeof (png_unknown_chunk)));
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks = np; /* safe because it is initialized */
info_ptr->free_me |= PNG_FREE_UNKN;
np += info_ptr->unknown_chunks_num;
/* Increment unknown_chunks_num each time round the loop to protect the
* just-allocated chunk data.
*/
for (; --num_unknowns >= 0;
++np, ++unknowns, ++(info_ptr->unknown_chunks_num))
{
memcpy(np->name, unknowns->name, (sizeof unknowns->name));
np->name[(sizeof np->name)-1] = '\0';
np->size = unknowns->size;
np->location = check_location(png_ptr, unknowns->location);
if (unknowns->size == 0)
np->data = NULL;
else
{
/* png_error is safe here because the list is stored in png_ptr */
np->data = png_voidcast(png_bytep,
png_malloc(png_ptr, unknowns->size));
memcpy(np->data, unknowns->data, unknowns->size);
}
}
}
void PNGAPI
png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
int chunk, int location)
{
/* This API is pretty pointless in 1.6.0 because the location can be set
* before the call to png_set_unknown_chunks.
*
* TODO: add a png_app_warning in 1.7
*/
if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
(unsigned int)chunk < info_ptr->unknown_chunks_num)
{
if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
{
png_app_error(png_ptr, "invalid unknown chunk location");
/* Fake out the pre 1.6.0 behavior: */
if ((location & PNG_HAVE_IDAT)) /* undocumented! */
location = PNG_AFTER_IDAT;
else
location = PNG_HAVE_IHDR; /* also undocumented */
}
info_ptr->unknown_chunks[chunk].location =
check_location(png_ptr, (png_byte)location);
}
}
#endif
#ifdef PNG_MNG_FEATURES_SUPPORTED
png_uint_32 PNGAPI
png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
{
png_debug(1, "in png_permit_mng_features");
if (png_ptr == NULL)
return 0;
png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
return png_ptr->mng_features_permitted;
}
#endif
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
static unsigned int
add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
{
unsigned int i;
/* Utility function: update the 'keep' state of a chunk if it is already in
* the list, otherwise add it to the list.
*/
for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)
{
list[4] = (png_byte)keep;
return count;
}
if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
{
++count;
memcpy(list, add, 4);
list[4] = (png_byte)keep;
}
return count;
}
void PNGAPI
png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
png_const_bytep chunk_list, int num_chunksIn)
{
png_bytep new_list;
unsigned int num_chunks, old_num_chunks;
if (png_ptr == NULL)
return;
if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
{
png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
return;
}
if (num_chunksIn <= 0)
{
png_ptr->unknown_default = keep;
/* '0' means just set the flags, so stop here */
if (num_chunksIn == 0)
return;
}
if (num_chunksIn < 0)
{
/* Ignore all unknown chunks and all chunks recognized by
* libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
*/
static PNG_CONST png_byte chunks_to_ignore[] = {
98, 75, 71, 68, '\0', /* bKGD */
99, 72, 82, 77, '\0', /* cHRM */
103, 65, 77, 65, '\0', /* gAMA */
104, 73, 83, 84, '\0', /* hIST */
105, 67, 67, 80, '\0', /* iCCP */
105, 84, 88, 116, '\0', /* iTXt */
111, 70, 70, 115, '\0', /* oFFs */
112, 67, 65, 76, '\0', /* pCAL */
112, 72, 89, 115, '\0', /* pHYs */
115, 66, 73, 84, '\0', /* sBIT */
115, 67, 65, 76, '\0', /* sCAL */
115, 80, 76, 84, '\0', /* sPLT */
115, 84, 69, 82, '\0', /* sTER */
115, 82, 71, 66, '\0', /* sRGB */
116, 69, 88, 116, '\0', /* tEXt */
116, 73, 77, 69, '\0', /* tIME */
122, 84, 88, 116, '\0' /* zTXt */
};
chunk_list = chunks_to_ignore;
num_chunks = (sizeof chunks_to_ignore)/5;
}
else /* num_chunksIn > 0 */
{
if (chunk_list == NULL)
{
/* Prior to 1.6.0 this was silently ignored, now it is an app_error
* which can be switched off.
*/
png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
return;
}
num_chunks = num_chunksIn;
}
old_num_chunks = png_ptr->num_chunk_list;
if (png_ptr->chunk_list == NULL)
old_num_chunks = 0;
/* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
*/
if (num_chunks + old_num_chunks > UINT_MAX/5)
{
png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
return;
}
/* If these chunks are being reset to the default then no more memory is
* required because add_one_chunk above doesn't extend the list if the 'keep'
* parameter is the default.
*/
if (keep)
{
new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
5 * (num_chunks + old_num_chunks)));
if (old_num_chunks > 0)
memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
}
else if (old_num_chunks > 0)
new_list = png_ptr->chunk_list;
else
new_list = NULL;
/* Add the new chunks together with each one's handling code. If the chunk
* already exists the code is updated, otherwise the chunk is added to the
* end. (In libpng 1.6.0 order no longer matters because this code enforces
* the earlier convention that the last setting is the one that is used.)
*/
if (new_list != NULL)
{
png_const_bytep inlist;
png_bytep outlist;
unsigned int i;
for (i=0; i<num_chunks; ++i)
old_num_chunks = add_one_chunk(new_list, old_num_chunks,
chunk_list+5*i, keep);
/* Now remove any spurious 'default' entries. */
num_chunks = 0;
for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
if (inlist[4])
{
if (outlist != inlist)
memcpy(outlist, inlist, 5);
outlist += 5;
++num_chunks;
}
/* This means the application has removed all the specialized handling. */
if (num_chunks == 0)
{
if (png_ptr->chunk_list != new_list)
png_free(png_ptr, new_list);
new_list = NULL;
}
}
else
num_chunks = 0;
png_ptr->num_chunk_list = num_chunks;
if (png_ptr->chunk_list != new_list)
{
if (png_ptr->chunk_list != NULL)
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list = new_list;
}
}
#endif
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
void PNGAPI
png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
png_user_chunk_ptr read_user_chunk_fn)
{
png_debug(1, "in png_set_read_user_chunk_fn");
if (png_ptr == NULL)
return;
png_ptr->read_user_chunk_fn = read_user_chunk_fn;
png_ptr->user_chunk_ptr = user_chunk_ptr;
}
#endif
#ifdef PNG_INFO_IMAGE_SUPPORTED
void PNGAPI
png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
png_bytepp row_pointers)
{
png_debug1(1, "in %s storage function", "rows");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
info_ptr->row_pointers = row_pointers;
if (row_pointers)
info_ptr->valid |= PNG_INFO_IDAT;
}
#endif
void PNGAPI
png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
{
if (png_ptr == NULL)
return;
if (size == 0 || size > PNG_UINT_31_MAX)
png_error(png_ptr, "invalid compression buffer size");
# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
if (png_ptr->mode & PNG_IS_READ_STRUCT)
{
png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
return;
}
# endif
# ifdef PNG_WRITE_SUPPORTED
if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
{
if (png_ptr->zowner != 0)
{
png_warning(png_ptr,
"Compression buffer size cannot be changed because it is in use");
return;
}
if (size > ZLIB_IO_MAX)
{
png_warning(png_ptr,
"Compression buffer size limited to system maximum");
size = ZLIB_IO_MAX; /* must fit */
}
else if (size < 6)
{
/* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
* if this is permitted.
*/
png_warning(png_ptr,
"Compression buffer size cannot be reduced below 6");
return;
}
if (png_ptr->zbuffer_size != size)
{
png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
png_ptr->zbuffer_size = (uInt)size;
}
}
# endif
}
void PNGAPI
png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
{
if (png_ptr && info_ptr)
info_ptr->valid &= ~mask;
}
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* This function was added to libpng 1.2.6 */
void PNGAPI
png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
png_uint_32 user_height_max)
{
/* Images with dimensions larger than these limits will be
* rejected by png_set_IHDR(). To accept any PNG datastream
* regardless of dimensions, set both limits to 0x7ffffffL.
*/
if (png_ptr == NULL)
return;
png_ptr->user_width_max = user_width_max;
png_ptr->user_height_max = user_height_max;
}
/* This function was added to libpng 1.4.0 */
void PNGAPI
png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
{
if (png_ptr)
png_ptr->user_chunk_cache_max = user_chunk_cache_max;
}
/* This function was added to libpng 1.4.1 */
void PNGAPI
png_set_chunk_malloc_max (png_structrp png_ptr,
png_alloc_size_t user_chunk_malloc_max)
{
if (png_ptr)
png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
}
#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_set_benign_errors(png_structrp png_ptr, int allowed)
{
png_debug(1, "in png_set_benign_errors");
/* If allowed is 1, png_benign_error() is treated as a warning.
*
* If allowed is 0, png_benign_error() is treated as an error (which
* is the default behavior if png_set_benign_errors() is not called).
*/
if (allowed)
png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
else
png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
}
#endif /* PNG_BENIGN_ERRORS_SUPPORTED */
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
/* Do not report invalid palette index; added at libng-1.5.10 */
void PNGAPI
png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
{
png_debug(1, "in png_set_check_for_invalid_index");
if (allowed > 0)
png_ptr->num_palette_max = 0;
else
png_ptr->num_palette_max = -1;
}
#endif
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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