/* pngset.c - storage of image information into info struct
*
* Copyright (c) 2018-2026 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,
png_fixed(png_ptr, white_x,
"png_set_mDCV(white(x))"),
png_fixed(png_ptr, white_y,
"png_set_mDCV(white(y))"),
png_fixed(png_ptr, red_x,
"png_set_mDCV(red(x))"),
png_fixed(png_ptr, red_y,
"png_set_mDCV(red(y))"),
png_fixed(png_ptr, green_x,
"png_set_mDCV(green(x))"),
png_fixed(png_ptr, green_y,
"png_set_mDCV(green(y))"),
png_fixed(png_ptr, blue_x,
"png_set_mDCV(blue(x))"),
png_fixed(png_ptr, blue_y,
"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 ||
exif == NULL)
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)
{
png_uint_16 safe_hist[PNG_MAX_PALETTE_LENGTH];
int i;
png_debug1(
1,
"in %s storage function",
"hIST");
if (png_ptr == NULL || info_ptr == NULL || hist == 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;
}
/* Snapshot the caller's hist before freeing, in case it points to
* info_ptr->hist (getter-to-setter aliasing).
*/
memcpy(safe_hist, hist, (
unsigned int)info_ptr->num_palette *
(
sizeof (png_uint_16)));
hist = safe_hist;
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_APNG_SUPPORTED
/* for non-animated png. this may be overwritten from an acTL chunk later */
info_ptr->num_frames =
1;
#endif
}
#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_color safe_palette[PNG_MAX_PALETTE_LENGTH];
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");
}
/* Snapshot the caller's palette before freeing, in case it points to
* info_ptr->palette (getter-to-setter aliasing).
*/
if (num_palette >
0)
memcpy(safe_palette, palette, (
unsigned int)num_palette *
(
sizeof (png_color)));
palette = safe_palette;
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.
*
* Allocate independent buffers for info_ptr and png_ptr so that the
* lifetime of png_ptr->palette is decoupled from the lifetime of
* info_ptr->palette. Previously, these two pointers were aliased,
* which caused a use-after-free vulnerability if png_free_data freed
* info_ptr->palette while png_ptr->palette was still in use by the
* row transform functions (e.g. png_do_expand_palette).
*
* Both buffers are allocated with png_calloc to zero-fill, because
* the ARM NEON palette riffle reads all 256 entries unconditionally,
* regardless of num_palette.
*/
png_free(png_ptr, png_ptr->palette);
png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * (
sizeof (png_color))));
info_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * (
sizeof (png_color))));
png_ptr->num_palette = info_ptr->num_palette = (png_uint_16)num_palette;
if (num_palette >
0)
{
memcpy(info_ptr->palette, palette, (
unsigned int)num_palette *
(
sizeof (png_color)));
memcpy(png_ptr->palette, palette, (
unsigned int)num_palette *
(
sizeof (png_color)));
}
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_textp old_text = NULL;
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;
}
/* Defer freeing the old array until after the copy loop below,
* in case text_ptr aliases info_ptr->text (getter-to-setter).
*/
old_text = 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);
png_free(png_ptr, old_text);
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);
}
png_free(png_ptr, old_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)
{
/* Snapshot the caller's trans_alpha before freeing, in case it
* points to info_ptr->trans_alpha (getter-to-setter aliasing).
*/
png_byte safe_trans[PNG_MAX_PALETTE_LENGTH];
if (num_trans >
0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
memcpy(safe_trans, trans_alpha, (size_t)num_trans);
trans_alpha = safe_trans;
png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS,
0);
if (num_trans >
0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
{
/* Allocate info_ptr's copy of the transparency data.
* Initialize all entries to fully opaque (0xff), then overwrite
* the first num_trans entries with the actual values.
*/
info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
memset(info_ptr->trans_alpha,
0xff, PNG_MAX_PALETTE_LENGTH);
memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
info_ptr->free_me |= PNG_FREE_TRNS;
info_ptr->valid |= PNG_INFO_tRNS;
/* Allocate an independent copy for png_struct, so that the
* lifetime of png_ptr->trans_alpha is decoupled from the
* lifetime of info_ptr->trans_alpha. Previously these two
* pointers were aliased, which caused a use-after-free if
* png_free_data freed info_ptr->trans_alpha while
* png_ptr->trans_alpha was still in use by the row transform
* functions (e.g. png_do_expand_palette).
*/
png_free(png_ptr, png_ptr->trans_alpha);
png_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
memset(png_ptr->trans_alpha,
0xff, PNG_MAX_PALETTE_LENGTH);
memcpy(png_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
}
else
{
png_free(png_ptr, png_ptr->trans_alpha);
png_ptr->trans_alpha = NULL;
}
}
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;
}
info_ptr->num_trans = (png_uint_16)num_trans;
if (num_trans !=
0)
{
info_ptr->free_me |= PNG_FREE_TRNS;
info_ptr->valid |= PNG_INFO_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;
png_sPLT_tp old_spalettes;
png_debug1(
1,
"in %s storage function",
"sPLT");
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;
}
/* Defer freeing the old array until after the copy loop below,
* in case entries aliases info_ptr->splt_palettes (getter-to-setter).
*/
old_spalettes = info_ptr->splt_palettes;
info_ptr->splt_palettes = np;
info_ptr->free_me |= PNG_FREE_SPLT;
np += info_ptr->splt_palettes_num;
do
{
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 event 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);
np->name = NULL;
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,
(
unsigned int)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;
++entries;
}
while (--nentries);
png_free(png_ptr, old_spalettes);
if (nentries >
0)
png_chunk_report(png_ptr,
"sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
}
#endif /* sPLT */
#ifdef PNG_APNG_SUPPORTED
png_uint_32 PNGAPI
png_set_acTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 num_frames, png_uint_32 num_plays)
{
png_debug1(
1,
"in %s storage function",
"acTL");
if (png_ptr == NULL || info_ptr == NULL)
{
png_warning(png_ptr,
"Call to png_set_acTL() with NULL png_ptr "
"or info_ptr ignored");
return (
0);
}
if (num_frames ==
0)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_frames zero");
return (
0);
}
if (num_frames > PNG_UINT_31_MAX)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_frames > 2^31-1");
return (
0);
}
if (num_plays > PNG_UINT_31_MAX)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_plays > 2^31-1");
return (
0);
}
info_ptr->num_frames = num_frames;
info_ptr->num_plays = num_plays;
info_ptr->valid |= PNG_INFO_acTL;
return (
1);
}
/* delay_num and delay_den can hold any 16-bit values including zero */
png_uint_32 PNGAPI
png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op)
{
png_debug1(
1,
"in %s storage function",
"fcTL");
if (png_ptr == NULL || info_ptr == NULL)
{
png_warning(png_ptr,
"Call to png_set_fcTL() with NULL png_ptr or info_ptr "
"ignored");
return (
0);
}
png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
delay_num, delay_den, dispose_op, blend_op);
if (blend_op == PNG_BLEND_OP_OVER)
{
if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ==
0 &&
png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ==
0)
{
png_warning(png_ptr,
"PNG_BLEND_OP_OVER is meaningless "
"and wasteful for opaque images, ignored");
blend_op = PNG_BLEND_OP_SOURCE;
}
}
info_ptr->next_frame_width = width;
info_ptr->next_frame_height = height;
info_ptr->next_frame_x_offset = x_offset;
info_ptr->next_frame_y_offset = y_offset;
info_ptr->next_frame_delay_num = delay_num;
info_ptr->next_frame_delay_den = delay_den;
info_ptr->next_frame_dispose_op = dispose_op;
info_ptr->next_frame_blend_op = blend_op;
info_ptr->valid |= PNG_INFO_fcTL;
return (
1);
}
void /* PRIVATE */
png_ensure_fcTL_is_valid(png_structp png_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op)
{
if (width ==
0 || width > PNG_UINT_31_MAX)
png_error(png_ptr,
"invalid width in fcTL (0 or > 2^31-1)");
if (height ==
0 || height > PNG_UINT_31_MAX)
png_error(png_ptr,
"invalid height in fcTL (0 or > 2^31-1)");
if (x_offset > PNG_UINT_31_MAX)
png_error(png_ptr,
"invalid x_offset in fcTL (> 2^31-1)");
if (y_offset > PNG_UINT_31_MAX)
png_error(png_ptr,
"invalid y_offset in fcTL (> 2^31-1)");
if (width + x_offset > png_ptr->first_frame_width ||
height + y_offset > png_ptr->first_frame_height)
png_error(png_ptr,
"dimensions of a frame are greater than "
"the ones in IHDR");
if (dispose_op != PNG_DISPOSE_OP_NONE &&
dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
dispose_op != PNG_DISPOSE_OP_PREVIOUS)
png_error(png_ptr,
"invalid dispose_op in fcTL");
if (blend_op != PNG_BLEND_OP_SOURCE &&
blend_op != PNG_BLEND_OP_OVER)
png_error(png_ptr,
"invalid blend_op in fcTL");
PNG_UNUSED(delay_num)
PNG_UNUSED(delay_den)
}
png_uint_32 PNGAPI
png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
png_byte is_hidden)
{
png_debug(
1,
"in png_first_frame_is_hidden()");
if (png_ptr == NULL)
return 0;
if (is_hidden !=
0)
png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
else
png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
PNG_UNUSED(info_ptr)
return 1;
}
#endif /* APNG */
#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) ==
0)
{
/* 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;
png_unknown_chunkp old_unknowns;
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) !=
0)
{
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) ==
0)
{
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;
}
/* Defer freeing the old array until after the copy loop below,
* in case unknowns aliases info_ptr->unknown_chunks (getter-to-setter).
*/
old_unknowns = 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);
}
png_free(png_ptr, old_unknowns);
}
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 (((
unsigned int)location & PNG_HAVE_IDAT) !=
0)
/* undocumented! */
location = PNG_AFTER_IDAT;
else
location = PNG_HAVE_IHDR;
/* also undocumented */
}
info_ptr->unknown_chunks[chunk].location =
check_location(png_ptr, location);
}
}
#endif /* STORE_UNKNOWN_CHUNKS */
#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 const png_byte chunks_to_ignore[] = {
98,
75,
71,
68,
'\0',
/* bKGD */
99,
72,
82,
77,
'\0',
/* cHRM */
99,
73,
67,
80,
'\0',
/* cICP */
99,
76,
76,
73,
'\0',
/* cLLI */
101,
88,
73,
102,
'\0',
/* eXIf */
103,
65,
77,
65,
'\0',
/* gAMA */
104,
73,
83,
84,
'\0',
/* hIST */
105,
67,
67,
80,
'\0',
/* iCCP */
105,
84,
88,
116,
'\0',
/* iTXt */
109,
68,
67,
86,
'\0',
/* mDCV */
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 = (
unsigned int)
/*SAFE*/(sizeof chunks_to_ignore)/5U;
}
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 = (
unsigned int)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 !=
0)
{
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_debug(
1,
"in png_set_rows");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->row_pointers != NULL &&
(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 != NULL)
info_ptr->valid |= PNG_INFO_IDAT;
}
#endif
void PNGAPI
png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
{
png_debug(
1,
"in png_set_compression_buffer_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) !=
0)
{
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) ==
0)
{
if (png_ptr->zowner !=
0)
{
png_warning(png_ptr,
"Compression buffer size cannot be changed because it is in use");
return;
}
#ifndef __COVERITY__
/* Some compilers complain that this is always false. However, it
* can be true when integer overflow happens.
*/
if (size > ZLIB_IO_MAX)
{
png_warning(png_ptr,
"Compression buffer size limited to system maximum");
size = ZLIB_IO_MAX;
/* must fit */
}
#endif
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 != NULL && info_ptr != NULL)
info_ptr->valid &= (
unsigned int)(~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)
{
png_debug(
1,
"in png_set_user_limits");
/* 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 0x7fffffff.
*/
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)
{
png_debug(
1,
"in png_set_chunk_cache_max");
if (png_ptr != NULL)
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)
{
png_debug(
1,
"in png_set_chunk_malloc_max");
/* pngstruct::user_chunk_malloc_max is initialized to a non-zero value in
* png.c. This API supports '0' for unlimited, make sure the correct
* (unlimited) value is set here to avoid a need to check for 0 everywhere
* the parameter is used.
*/
if (png_ptr != NULL)
{
if (user_chunk_malloc_max ==
0U)
/* unlimited */
{
# ifdef PNG_MAX_MALLOC_64K
png_ptr->user_chunk_malloc_max =
65536U;
# else
png_ptr->user_chunk_malloc_max = PNG_SIZE_MAX;
# endif
}
else
png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
}
}
#endif /* ?SET_USER_LIMITS */
#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 !=
0)
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 /* BENIGN_ERRORS */
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
/* Whether to report invalid palette index; added at libpng-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 zeros
* (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
#if defined(PNG_TEXT_SUPPORTED) ||
defined(PNG_pCAL_SUPPORTED) || \
defined(PNG_iCCP_SUPPORTED) ||
defined(PNG_sPLT_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
* and if invalid, correct the keyword rather than discarding the entire
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
* length, forbids leading or trailing whitespace, multiple internal spaces,
* and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
*
* The 'new_key' buffer must be 80 characters in size (for the keyword plus a
* trailing '\0'). If this routine returns 0 then there was no keyword, or a
* valid one could not be generated, and the caller must png_error.
*/
png_uint_32
/* PRIVATE */
png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
{
#ifdef PNG_WARNINGS_SUPPORTED
png_const_charp orig_key = key;
#endif
png_uint_32 key_len =
0;
int bad_character =
0;
int space =
1;
png_debug(
1,
"in png_check_keyword");
if (key == NULL)
{
*new_key =
0;
return 0;
}
while (*key && key_len <
79)
{
png_byte ch = (png_byte)*key++;
if ((ch >
32 && ch <=
126) || (ch >=
161 /*&& ch <= 255*/))
{
*new_key++ = ch; ++key_len; space =
0;
}
else if (space ==
0)
{
/* A space or an invalid character when one wasn't seen immediately
* before; output just a space.
*/
*new_key++ =
32; ++key_len; space =
1;
/* If the character was not a space then it is invalid. */
if (ch !=
32)
bad_character = ch;
}
else if (bad_character ==
0)
bad_character = ch;
/* just skip it, record the first error */
}
if (key_len >
0 && space !=
0)
/* trailing space */
{
--key_len; --new_key;
if (bad_character ==
0)
bad_character =
32;
}
/* Terminate the keyword */
*new_key =
0;
if (key_len ==
0)
return 0;
#ifdef PNG_WARNINGS_SUPPORTED
/* Try to only output one warning per keyword: */
if (*key !=
0)
/* keyword too long */
png_warning(png_ptr,
"keyword truncated");
else if (bad_character !=
0)
{
PNG_WARNING_PARAMETERS(p)
png_warning_parameter(p,
1, orig_key);
png_warning_parameter_signed(p,
2, PNG_NUMBER_FORMAT_02x, bad_character);
png_formatted_warning(png_ptr, p,
"keyword \"@
1\
": bad character '0x@2'");
}
#else /* !WARNINGS */
PNG_UNUSED(png_ptr)
#endif /* !WARNINGS */
return key_len;
}
#endif /* TEXT || pCAL || iCCP || sPLT */
#endif /* READ || WRITE */
