/* pngset.c - storage of image information into info struct | |
* | |
* Last changed in libpng 1.6.3 [July 18, 2013] | |
* Copyright (c) 1998-2013 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.red_X = int_red_X; | |
XYZ.red_Y = int_red_Y; | |
XYZ.red_Z = int_red_Z; | |
XYZ.green_X = int_green_X; | |
XYZ.green_Y = int_green_Y; | |
XYZ.green_Z = int_green_Z; | |
XYZ.blue_X = int_blue_X; | |
XYZ.blue_Y = int_blue_Y; | |
XYZ.blue_Z = 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; | |
png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); | |
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); | |
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) | |
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; | |
} | |
} | |
if ((num_palette > 0 && palette == NULL) || | |
(num_palette == 0 | |
# ifdef PNG_MNG_FEATURES_SUPPORTED | |
&& (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 | |
# endif | |
)) | |
{ | |
png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR); | |
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)))); | |
if (num_palette > 0) | |
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); | |
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)) | |
{ | |
/* This causes 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.) Pass | |
* the info_ptr color_type field to png_colorspace_set_ICC because in the | |
* write case it has not yet been stored in png_ptr. | |
*/ | |
{ | |
int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, | |
proflen, profile, info_ptr->color_type); | |
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 || text_ptr == NULL) | |
return(0); | |
/* Make sure we have enough space in the "text" array in info_struct | |
* to hold all of the incoming text_ptr objects. This compare can't overflow | |
* because max_text >= num_text (anyway, subtract of two positive integers | |
* can't overflow in any case.) | |
*/ | |
if (num_text > info_ptr->max_text - info_ptr->num_text) | |
{ | |
int old_num_text = info_ptr->num_text; | |
int max_text; | |
png_textp new_text = NULL; | |
/* Calculate an appropriate max_text, checking for overflow. */ | |
max_text = old_num_text; | |
if (num_text <= INT_MAX - max_text) | |
{ | |
max_text += num_text; | |
/* Round up to a multiple of 8 */ | |
if (max_text < INT_MAX-8) | |
max_text = (max_text + 8) & ~0x7; | |
else | |
max_text = INT_MAX; | |
/* Now allocate a new array and copy the old members in, this does all | |
* the overflow checks. | |
*/ | |
new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, | |
info_ptr->text, old_num_text, max_text-old_num_text, | |
sizeof *new_text)); | |
} | |
if (new_text == NULL) | |
{ | |
png_chunk_report(png_ptr, "too many text chunks", | |
PNG_CHUNK_WRITE_ERROR); | |
return 1; | |
} | |
png_free(png_ptr, info_ptr->text); | |
info_ptr->text = new_text; | |
info_ptr->free_me |= PNG_FREE_TEXT; | |
info_ptr->max_text = max_text; | |
/* num_text is adjusted below as the entries are copied in */ | |
png_debug1(3, "allocated %d entries for info_ptr->text", max_text); | |
} | |
for (i = 0; i < num_text; i++) | |
{ | |
size_t text_length, key_len; | |
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_chunk_report(png_ptr, "text compression mode is out of range", | |
PNG_CHUNK_WRITE_ERROR); | |
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_chunk_report(png_ptr, "iTXt chunk not supported", | |
PNG_CHUNK_WRITE_ERROR); | |
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_voidcast(png_charp,png_malloc_base(png_ptr, | |
key_len + text_length + lang_len + lang_key_len + 4)); | |
if (textp->key == NULL) | |
{ | |
png_chunk_report(png_ptr, "text chunk: out of memory", | |
PNG_CHUNK_WRITE_ERROR); | |
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, 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, 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; | |
if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) | |
return; | |
/* Use the internal realloc function, which checks for all the possible | |
* overflows. Notice that the parameters are (int) and (size_t) | |
*/ | |
np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, | |
info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, | |
sizeof *np)); | |
if (np == NULL) | |
{ | |
/* Out of memory or too many chunks */ | |
png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); | |
return; | |
} | |
png_free(png_ptr, info_ptr->splt_palettes); | |
info_ptr->splt_palettes = np; | |
info_ptr->free_me |= PNG_FREE_SPLT; | |
np += info_ptr->splt_palettes_num; | |
do | |
{ | |
png_size_t length; | |
/* Skip invalid input entries */ | |
if (entries->name == NULL || entries->entries == NULL) | |
{ | |
/* png_handle_sPLT doesn't do this, so this is an app error */ | |
png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); | |
/* Just skip the invalid entry */ | |
continue; | |
} | |
np->depth = entries->depth; | |
/* In the even of out-of-memory just return - there's no point keeping on | |
* trying to add sPLT chunks. | |
*/ | |
length = strlen(entries->name) + 1; | |
np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); | |
if (np->name == NULL) | |
break; | |
memcpy(np->name, entries->name, length); | |
/* IMPORTANT: we have memory now that won't get freed if something else | |
* goes wrong, this code must free it. png_malloc_array produces no | |
* warnings, use a png_chunk_report (below) if there is an error. | |
*/ | |
np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, | |
entries->nentries, sizeof (png_sPLT_entry))); | |
if (np->entries == NULL) | |
{ | |
png_free(png_ptr, np->name); | |
break; | |
} | |
np->nentries = entries->nentries; | |
/* This multiply can't overflow because png_malloc_array has already | |
* checked it when doing the allocation. | |
*/ | |
memcpy(np->entries, entries->entries, | |
entries->nentries * sizeof (png_sPLT_entry)); | |
/* Note that 'continue' skips the advance of the out pointer and out | |
* count, so an invalid entry is not added. | |
*/ | |
info_ptr->valid |= PNG_INFO_sPLT; | |
++(info_ptr->splt_palettes_num); | |
++np; | |
} | |
while (++entries, --nentries); | |
if (nentries > 0) | |
png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); | |
} | |
#endif /* PNG_sPLT_SUPPORTED */ | |
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
static png_byte | |
check_location(png_const_structrp png_ptr, 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_byte)(png_ptr->mode & | |
(PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); | |
} | |
/* This need not be an internal error - if the app calls | |
* png_set_unknown_chunks on a read pointer it must get the location right. | |
*/ | |
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 &= ~(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 || | |
unknowns == NULL) | |
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. Now png_chunk_report is used to provide behavior | |
* appropriate to read or write. | |
*/ | |
np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, | |
info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, | |
sizeof *np)); | |
if (np == NULL) | |
{ | |
png_chunk_report(png_ptr, "too many unknown chunks", | |
PNG_CHUNK_WRITE_ERROR); | |
return; | |
} | |
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; --num_unknowns, ++unknowns) | |
{ | |
memcpy(np->name, unknowns->name, (sizeof np->name)); | |
np->name[(sizeof np->name)-1] = '\0'; | |
np->location = check_location(png_ptr, unknowns->location); | |
if (unknowns->size == 0) | |
{ | |
np->data = NULL; | |
np->size = 0; | |
} | |
else | |
{ | |
np->data = png_voidcast(png_bytep, | |
png_malloc_base(png_ptr, unknowns->size)); | |
if (np->data == NULL) | |
{ | |
png_chunk_report(png_ptr, "unknown chunk: out of memory", | |
PNG_CHUNK_WRITE_ERROR); | |
/* But just skip storing the unknown chunk */ | |
continue; | |
} | |
memcpy(np->data, unknowns->data, unknowns->size); | |
np->size = unknowns->size; | |
} | |
/* These increments are skipped on out-of-memory for the data - the | |
* unknown chunk entry gets overwritten if the png_chunk_report returns. | |
* This is correct in the read case (the chunk is just dropped.) | |
*/ | |
++np; | |
++(info_ptr->unknown_chunks_num); | |
} | |
} | |
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 && | |
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, 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_chunks_in) | |
{ | |
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_chunks_in <= 0) | |
{ | |
png_ptr->unknown_default = keep; | |
/* '0' means just set the flags, so stop here */ | |
if (num_chunks_in == 0) | |
return; | |
} | |
if (num_chunks_in < 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_chunks_in > 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_chunks_in; | |
} | |
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 | |
/* Whether to report invalid palette index; added at libng-1.5.10. | |
* It is possible for an indexed (color-type==3) PNG file to contain | |
* pixels with invalid (out-of-range) indexes if the PLTE chunk has | |
* fewer entries than the image's bit-depth would allow. We recover | |
* from this gracefully by filling any incomplete palette with zeroes | |
* (opaque black). By default, when this occurs libpng will issue | |
* a benign error. This API can be used to override that behavior. | |
*/ | |
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 */ |