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pngset.c
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/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.6.26 [(PENDING RELEASE)]
* Copyright (c) 1998-2016 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*/) != 0)
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) != 0)
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 Green X"),
png_fixed(png_ptr, green_Y, "cHRM Green Y"),
png_fixed(png_ptr, green_Z, "cHRM Green Z"),
png_fixed(png_ptr, blue_X, "cHRM Blue X"),
png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
}
# endif /* FLOATING_POINT */
#endif /* cHRM */
#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) != 0)
info_ptr->channels = 3;
else
info_ptr->channels = 1;
if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
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_chunk_report(png_ptr, "Invalid pCAL equation type",
PNG_CHUNK_WRITE_ERROR);
return;
}
if (nparams < 0 || nparams > 255)
{
png_chunk_report(png_ptr, "Invalid pCAL parameter count",
PNG_CHUNK_WRITE_ERROR);
return;
}
/* Validate params[nparams] */
for (i=0; i<nparams; ++i)
{
if (params[i] == NULL ||
!png_check_fp_string(params[i], strlen(params[i])))
{
png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
PNG_CHUNK_WRITE_ERROR);
return;
}
}
info_ptr->pcal_purpose = png_voidcast(png_charp,
png_malloc_warn(png_ptr, length));
if (info_ptr->pcal_purpose == NULL)
{
png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
PNG_CHUNK_WRITE_ERROR);
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_uint_32 max_palette_length;
png_debug1(1, "in %s storage function", "PLTE");
if (png_ptr == NULL || info_ptr == NULL)
return;
max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
(1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
if (num_palette < 0 || num_palette > (int) 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_error(png_ptr, "Invalid palette");
}
/* 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 or incorrect
* call to png_set_PLTE() with 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) != 0)
{
/* 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 == 0)
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 != 0)
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 ? 0xabadca11U :
(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 /* iTXt */
{
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 != 0)
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) != 0)
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);
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
{
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
}
png_ptr->trans_alpha = info_ptr->trans_alpha;
}
if (trans_color != NULL)
{
#ifdef PNG_WARNINGS_SUPPORTED
if (info_ptr->bit_depth < 16)
{
int sample_max = (1 << info_ptr->bit_depth) - 1;
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");
}
#endif
info_ptr->trans_color = *trans_color;
if (num_trans == 0)
num_trans = 1;
}