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pngset.c
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/* pngset.c - storage of image information into info struct
*
* Copyright (c) 2018-2025 Cosmin Truta
* Copyright (c) 1998-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* 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_debug1(1, "in %s storage function", "cHRM fixed");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->cHRM.redx = red_x;
info_ptr->cHRM.redy = red_y;
info_ptr->cHRM.greenx = green_x;
info_ptr->cHRM.greeny = green_y;
info_ptr->cHRM.bluex = blue_x;
info_ptr->cHRM.bluey = blue_y;
info_ptr->cHRM.whitex = white_x;
info_ptr->cHRM.whitey = white_y;
info_ptr->valid |= PNG_INFO_cHRM;
}
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_xy xy;
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_xy_from_XYZ(&xy, &XYZ) == 0)
{
info_ptr->cHRM = xy;
info_ptr->valid |= PNG_INFO_cHRM;
}
else
png_app_error(png_ptr, "invalid cHRM XYZ");
}
# 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_cICP_SUPPORTED
void PNGAPI
png_set_cICP(png_const_structrp png_ptr, png_inforp info_ptr,
png_byte colour_primaries, png_byte transfer_function,
png_byte matrix_coefficients, png_byte video_full_range_flag)
{
png_debug1(1, "in %s storage function", "cICP");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->cicp_colour_primaries = colour_primaries;
info_ptr->cicp_transfer_function = transfer_function;
info_ptr->cicp_matrix_coefficients = matrix_coefficients;
info_ptr->cicp_video_full_range_flag = video_full_range_flag;
if (info_ptr->cicp_matrix_coefficients != 0)
{
png_warning(png_ptr, "Invalid cICP matrix coefficients");
return;
}
info_ptr->valid |= PNG_INFO_cICP;
}
#endif /* cICP */
#ifdef PNG_cLLI_SUPPORTED
void PNGFAPI
png_set_cLLI_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
/* The values below are in cd/m2 (nits) and are scaled by 10,000; not
* 100,000 as in the case of png_fixed_point.
*/
png_uint_32 maxCLL, png_uint_32 maxFALL)
{
png_debug1(1, "in %s storage function", "cLLI");
if (png_ptr == NULL || info_ptr == NULL)
return;
/* Check the light level range: */
if (maxCLL > 0x7FFFFFFFU || maxFALL > 0x7FFFFFFFU)
{
/* The limit is 200kcd/m2; somewhat bright but not inconceivable because
* human vision is said to run up to 100Mcd/m2. The sun is about 2Gcd/m2.
*
* The reference sRGB monitor is 80cd/m2 and the limit of PQ encoding is
* 2kcd/m2.
*/
png_chunk_report(png_ptr, "cLLI light level exceeds PNG limit",
PNG_CHUNK_WRITE_ERROR);
return;
}
info_ptr->maxCLL = maxCLL;
info_ptr->maxFALL = maxFALL;
info_ptr->valid |= PNG_INFO_cLLI;
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_cLLI(png_const_structrp png_ptr, png_inforp info_ptr,
double maxCLL, double maxFALL)
{
png_set_cLLI_fixed(png_ptr, info_ptr,
png_fixed_ITU(png_ptr, maxCLL, "png_set_cLLI(maxCLL)"),
png_fixed_ITU(png_ptr, maxFALL, "png_set_cLLI(maxFALL)"));
}
# endif /* FLOATING_POINT */
#endif /* cLLI */
#ifdef PNG_mDCV_SUPPORTED
static png_uint_16
png_ITU_fixed_16(int *error, png_fixed_point v)
{
/* Return a safe uint16_t value scaled according to the ITU H273 rules for
* 16-bit display chromaticities. Functions like the corresponding
* png_fixed() internal function with regard to errors: it's an error on
* write, a chunk_benign_error on read: See the definition of
* png_chunk_report in pngpriv.h.
*/
v /= 2; /* rounds to 0 in C: avoids insignificant arithmetic errors */
if (v > 65535 || v < 0)
{
*error = 1;
return 0;
}
return (png_uint_16)/*SAFE*/v;
}
void PNGAPI
png_set_mDCV_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_uint_32 maxDL,
png_uint_32 minDL)
{
png_uint_16 rx, ry, gx, gy, bx, by, wx, wy;
int error;
png_debug1(1, "in %s storage function", "mDCV");
if (png_ptr == NULL || info_ptr == NULL)
return;
/* Check the input values to ensure they are in the expected range: */
error = 0;
rx = png_ITU_fixed_16(&error, red_x);
ry = png_ITU_fixed_16(&error, red_y);
gx = png_ITU_fixed_16(&error, green_x);
gy = png_ITU_fixed_16(&error, green_y);
bx = png_ITU_fixed_16(&error, blue_x);
by = png_ITU_fixed_16(&error, blue_y);
wx = png_ITU_fixed_16(&error, white_x);
wy = png_ITU_fixed_16(&error, white_y);
if (error)
{
png_chunk_report(png_ptr,
"mDCV chromaticities outside representable range",
PNG_CHUNK_WRITE_ERROR);
return;
}
/* Check the light level range: */
if (maxDL > 0x7FFFFFFFU || minDL > 0x7FFFFFFFU)
{
/* The limit is 200kcd/m2; somewhat bright but not inconceivable because
* human vision is said to run up to 100Mcd/m2. The sun is about 2Gcd/m2.
*
* The reference sRGB monitor is 80cd/m2 and the limit of PQ encoding is
* 2kcd/m2.
*/
png_chunk_report(png_ptr, "mDCV display light level exceeds PNG limit",
PNG_CHUNK_WRITE_ERROR);
return;
}
/* All values are safe, the settings are accepted.
*
* IMPLEMENTATION NOTE: in practice the values can be checked and assigned
* but the result is confusing if a writing app calls png_set_mDCV more than
* once, the second time with an invalid value. This approach is more
* obviously correct at the cost of typing and a very slight machine
* overhead.
*/
info_ptr->mastering_red_x = rx;
info_ptr->mastering_red_y = ry;
info_ptr->mastering_green_x = gx;
info_ptr->mastering_green_y = gy;
info_ptr->mastering_blue_x = bx;
info_ptr->mastering_blue_y = by;
info_ptr->mastering_white_x = wx;
info_ptr->mastering_white_y = wy;
info_ptr->mastering_maxDL = maxDL;
info_ptr->mastering_minDL = minDL;
info_ptr->valid |= PNG_INFO_mDCV;
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_mDCV(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,
double maxDL, double minDL)
{
png_set_mDCV_fixed(png_ptr, info_ptr,
/* The ITU approach is to scale by 50,000, not 100,000 so just divide
* the input values by 2 and use png_fixed:
*/
png_fixed(png_ptr, white_x / 2, "png_set_mDCV(white(x))"),
png_fixed(png_ptr, white_y / 2, "png_set_mDCV(white(y))"),
png_fixed(png_ptr, red_x / 2, "png_set_mDCV(red(x))"),
png_fixed(png_ptr, red_y / 2, "png_set_mDCV(red(y))"),
png_fixed(png_ptr, green_x / 2, "png_set_mDCV(green(x))"),
png_fixed(png_ptr, green_y / 2, "png_set_mDCV(green(y))"),
png_fixed(png_ptr, blue_x / 2, "png_set_mDCV(blue(x))"),
png_fixed(png_ptr, blue_y / 2, "png_set_mDCV(blue(y))"),
png_fixed_ITU(png_ptr, maxDL, "png_set_mDCV(maxDL)"),
png_fixed_ITU(png_ptr, minDL, "png_set_mDCV(minDL)"));
}
# endif /* FLOATING_POINT */
#endif /* mDCV */
#ifdef PNG_eXIf_SUPPORTED
void PNGAPI
png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
png_bytep exif)
{
png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
PNG_UNUSED(info_ptr)
PNG_UNUSED(exif)
}
void PNGAPI
png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
png_uint_32 num_exif, png_bytep exif)
{
png_bytep new_exif;
png_debug1(1, "in %s storage function", "eXIf");
if (png_ptr == NULL || info_ptr == NULL ||
(png_ptr->mode & PNG_WROTE_eXIf) != 0)
return;
new_exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr, num_exif));
if (new_exif == NULL)
{
png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
return;
}
memcpy(new_exif, exif, (size_t)num_exif);
png_free_data(png_ptr, info_ptr, PNG_FREE_EXIF, 0);
info_ptr->num_exif = num_exif;
info_ptr->exif = new_exif;
info_ptr->free_me |= PNG_FREE_EXIF;
info_ptr->valid |= PNG_INFO_eXIf;
}
#endif /* eXIf */
#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;
info_ptr->gamma = file_gamma;
info_ptr->valid |= PNG_INFO_gAMA;
}
# 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;
}
for (i = 0; i < info_ptr->num_palette; i++)
info_ptr->hist[i] = hist[i];
info_ptr->free_me |= PNG_FREE_HIST;
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)
{
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);
info_ptr->free_me |= PNG_FREE_PCAL;
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,
(size_t)(((unsigned int)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, ((unsigned int)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;
}
#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)
{
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->free_me |= PNG_FREE_SCAL;
info_ptr->valid |= PNG_INFO_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, (unsigned int)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;
info_ptr->rendering_intent = srgb_intent;
info_ptr->valid |= PNG_INFO_sRGB;
}
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;
png_set_sRGB(png_ptr, info_ptr, srgb_intent);
# ifdef PNG_gAMA_SUPPORTED
png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
# endif /* gAMA */
# ifdef PNG_cHRM_SUPPORTED
png_set_cHRM_fixed(png_ptr, info_ptr,
/* color x y */
/* white */ 31270, 32900,
/* red */ 64000, 33000,
/* green */ 30000, 60000,
/* blue */ 15000, 6000);
# endif /* cHRM */
}
#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;
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");
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 text storage function, chunk typeid = 0x%lx",
png_ptr == NULL ? 0xabadca11UL : (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)
{