#include "pngpriv.h"
typedef png_libpng_version_1_6_20 Your_png_h_is_not_version_1_6_20;
#ifdef PNG_READ_SUPPORTED
void PNGAPI
png_set_sig_bytes(png_structrp png_ptr, int num_bytes)
{
unsigned int nb = (unsigned int)num_bytes;
png_debug(1, "in png_set_sig_bytes");
if (png_ptr == NULL)
return;
if (num_bytes < 0)
nb = 0;
if (nb > 8)
png_error(png_ptr, "Too many bytes for PNG signature");
png_ptr->sig_bytes = (png_byte)nb;
}
int PNGAPI
png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
if (num_to_check > 8)
num_to_check = 8;
else if (num_to_check < 1)
return (-1);
if (start > 7)
return (-1);
if (start + num_to_check > 8)
num_to_check = 8 - start;
return ((int)(memcmp(&sig[start], &png_signature[start], num_to_check)));
}
#endif
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
PNG_FUNCTION(voidpf ,
png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED)
{
png_alloc_size_t num_bytes = size;
if (png_ptr == NULL)
return NULL;
if (items >= (~(png_alloc_size_t)0)/size)
{
png_warning (png_voidcast(png_structrp, png_ptr),
"Potential overflow in png_zalloc()");
return NULL;
}
num_bytes *= items;
return png_malloc_warn(png_voidcast(png_structrp, png_ptr), num_bytes);
}
void
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_free(png_voidcast(png_const_structrp,png_ptr), ptr);
}
void
png_reset_crc(png_structrp png_ptr)
{
png_ptr->crc = (png_uint_32)crc32(0, Z_NULL, 0);
}
void
png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
{
int need_crc = 1;
if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0)
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
need_crc = 0;
}
else
{
if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0)
need_crc = 0;
}
if (need_crc != 0 && length > 0)
{
uLong crc = png_ptr->crc;
do
{
uInt safe_length = (uInt)length;
#ifndef __COVERITY__
if (safe_length == 0)
safe_length = (uInt)-1;
#endif
crc = crc32(crc, ptr, safe_length);
ptr += safe_length;
length -= safe_length;
}
while (length > 0);
png_ptr->crc = (png_uint_32)crc;
}
}
int
png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
{
if (user_png_ver != NULL)
{
int i = -1;
int found_dots = 0;
do
{
i++;
if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i])
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
if (user_png_ver[i] == '.')
found_dots++;
} while (found_dots < 2 && user_png_ver[i] != 0 &&
PNG_LIBPNG_VER_STRING[i] != 0);
}
else
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
if ((png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) != 0)
{
#ifdef PNG_WARNINGS_SUPPORTED
size_t pos = 0;
char m[128];
pos = png_safecat(m, (sizeof m), pos,
"Application built with libpng-");
pos = png_safecat(m, (sizeof m), pos, user_png_ver);
pos = png_safecat(m, (sizeof m), pos, " but running with ");
pos = png_safecat(m, (sizeof m), pos, PNG_LIBPNG_VER_STRING);
PNG_UNUSED(pos)
png_warning(png_ptr, m);
#endif
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
png_ptr->flags = 0;
#endif
return 0;
}
return 1;
}
PNG_FUNCTION(png_structp ,
png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
{
png_struct create_struct;
# ifdef PNG_SETJMP_SUPPORTED
jmp_buf create_jmp_buf;
# endif
memset(&create_struct, 0, (sizeof create_struct));
# ifdef PNG_USER_LIMITS_SUPPORTED
create_struct.user_width_max = PNG_USER_WIDTH_MAX;
create_struct.user_height_max = PNG_USER_HEIGHT_MAX;
# ifdef PNG_USER_CHUNK_CACHE_MAX
create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
# endif
# ifdef PNG_USER_CHUNK_MALLOC_MAX
create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
# endif
# endif
# ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(&create_struct, mem_ptr, malloc_fn, free_fn);
# else
PNG_UNUSED(mem_ptr)
PNG_UNUSED(malloc_fn)
PNG_UNUSED(free_fn)
# endif
png_set_error_fn(&create_struct, error_ptr, error_fn, warn_fn);
# ifdef PNG_SETJMP_SUPPORTED
if (!setjmp(create_jmp_buf))
# endif
{
# ifdef PNG_SETJMP_SUPPORTED
create_struct.jmp_buf_ptr = &create_jmp_buf;
create_struct.jmp_buf_size = 0;
create_struct.longjmp_fn = longjmp;
# endif
if (png_user_version_check(&create_struct, user_png_ver) != 0)
{
png_structrp png_ptr = png_voidcast(png_structrp,
png_malloc_warn(&create_struct, (sizeof *png_ptr)));
if (png_ptr != NULL)
{
create_struct.zstream.zalloc = png_zalloc;
create_struct.zstream.zfree = png_zfree;
create_struct.zstream.opaque = png_ptr;
# ifdef PNG_SETJMP_SUPPORTED
create_struct.jmp_buf_ptr = NULL;
create_struct.jmp_buf_size = 0;
create_struct.longjmp_fn = 0;
# endif
*png_ptr = create_struct;
return png_ptr;
}
}
}
return NULL;
}
PNG_FUNCTION(png_infop,PNGAPI
png_create_info_struct,(png_const_structrp png_ptr),PNG_ALLOCATED)
{
png_inforp info_ptr;
png_debug(1, "in png_create_info_struct");
if (png_ptr == NULL)
return NULL;
info_ptr = png_voidcast(png_inforp, png_malloc_base(png_ptr,
(sizeof *info_ptr)));
if (info_ptr != NULL)
memset(info_ptr, 0, (sizeof *info_ptr));
return info_ptr;
}
void PNGAPI
png_destroy_info_struct(png_const_structrp png_ptr, png_infopp info_ptr_ptr)
{
png_inforp info_ptr = NULL;
png_debug(1, "in png_destroy_info_struct");
if (png_ptr == NULL)
return;
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
if (info_ptr != NULL)
{
*info_ptr_ptr = NULL;
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
memset(info_ptr, 0, (sizeof *info_ptr));
png_free(png_ptr, info_ptr);
}
}
PNG_FUNCTION(void,PNGAPI
png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size),
PNG_DEPRECATED)
{
png_inforp info_ptr = *ptr_ptr;
png_debug(1, "in png_info_init_3");
if (info_ptr == NULL)
return;
if ((sizeof (png_info)) > png_info_struct_size)
{
*ptr_ptr = NULL;
free(info_ptr);
info_ptr = png_voidcast(png_inforp, png_malloc_base(NULL,
(sizeof *info_ptr)));
if (info_ptr == NULL)
return;
*ptr_ptr = info_ptr;
}
memset(info_ptr, 0, (sizeof *info_ptr));
}
void PNGAPI
png_data_freer(png_const_structrp png_ptr, png_inforp info_ptr,
int freer, png_uint_32 mask)
{
png_debug(1, "in png_data_freer");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (freer == PNG_DESTROY_WILL_FREE_DATA)
info_ptr->free_me |= mask;
else if (freer == PNG_USER_WILL_FREE_DATA)
info_ptr->free_me &= ~mask;
else
png_error(png_ptr, "Unknown freer parameter in png_data_freer");
}
void PNGAPI
png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask,
int num)
{
png_debug(1, "in png_free_data");
if (png_ptr == NULL || info_ptr == NULL)
return;
#ifdef PNG_TEXT_SUPPORTED
if (info_ptr->text != 0 &&
((mask & PNG_FREE_TEXT) & info_ptr->free_me) != 0)
{
if (num != -1)
{
png_free(png_ptr, info_ptr->text[num].key);
info_ptr->text[num].key = NULL;
}
else
{
int i;
for (i = 0; i < info_ptr->num_text; i++)
png_free(png_ptr, info_ptr->text[i].key);
png_free(png_ptr, info_ptr->text);
info_ptr->text = NULL;
info_ptr->num_text = 0;
}
}
#endif
#ifdef PNG_tRNS_SUPPORTED
if (((mask & PNG_FREE_TRNS) & info_ptr->free_me) != 0)
{
info_ptr->valid &= ~PNG_INFO_tRNS;
png_free(png_ptr, info_ptr->trans_alpha);
info_ptr->trans_alpha = NULL;
info_ptr->num_trans = 0;
}
#endif
#ifdef PNG_sCAL_SUPPORTED
if (((mask & PNG_FREE_SCAL) & info_ptr->free_me) != 0)
{
png_free(png_ptr, info_ptr->scal_s_width);
png_free(png_ptr, info_ptr->scal_s_height);
info_ptr->scal_s_width = NULL;
info_ptr->scal_s_height = NULL;
info_ptr->valid &= ~PNG_INFO_sCAL;
}
#endif
#ifdef PNG_pCAL_SUPPORTED
if (((mask & PNG_FREE_PCAL) & info_ptr->free_me) != 0)
{
png_free(png_ptr, info_ptr->pcal_purpose);
png_free(png_ptr, info_ptr->pcal_units);
info_ptr->pcal_purpose = NULL;
info_ptr->pcal_units = NULL;
if (info_ptr->pcal_params != NULL)
{
int i;
for (i = 0; i < info_ptr->pcal_nparams; i++)
png_free(png_ptr, info_ptr->pcal_params[i]);
png_free(png_ptr, info_ptr->pcal_params);
info_ptr->pcal_params = NULL;
}
info_ptr->valid &= ~PNG_INFO_pCAL;
}
#endif
#ifdef PNG_iCCP_SUPPORTED
if (((mask & PNG_FREE_ICCP) & info_ptr->free_me) != 0)
{
png_free(png_ptr, info_ptr->iccp_name);
png_free(png_ptr, info_ptr->iccp_profile);
info_ptr->iccp_name = NULL;
info_ptr->iccp_profile = NULL;
info_ptr->valid &= ~PNG_INFO_iCCP;
}
#endif
#ifdef PNG_sPLT_SUPPORTED
if (info_ptr->splt_palettes != 0 &&
((mask & PNG_FREE_SPLT) & info_ptr->free_me) != 0)
{
if (num != -1)
{
png_free(png_ptr, info_ptr->splt_palettes[num].name);
png_free(png_ptr, info_ptr->splt_palettes[num].entries);
info_ptr->splt_palettes[num].name = NULL;
info_ptr->splt_palettes[num].entries = NULL;
}
else
{
int i;
for (i = 0; i < info_ptr->splt_palettes_num; i++)
{
png_free(png_ptr, info_ptr->splt_palettes[i].name);
png_free(png_ptr, info_ptr->splt_palettes[i].entries);
}
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes = NULL;
info_ptr->splt_palettes_num = 0;
info_ptr->valid &= ~PNG_INFO_sPLT;
}
}
#endif
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
if (info_ptr->unknown_chunks != 0 &&
((mask & PNG_FREE_UNKN) & info_ptr->free_me) != 0)
{
if (num != -1)
{
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
info_ptr->unknown_chunks[num].data = NULL;
}
else
{
int i;
for (i = 0; i < info_ptr->unknown_chunks_num; i++)
png_free(png_ptr, info_ptr->unknown_chunks[i].data);
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks = NULL;
info_ptr->unknown_chunks_num = 0;
}
}
#endif
#ifdef PNG_hIST_SUPPORTED
if (((mask & PNG_FREE_HIST) & info_ptr->free_me) != 0)
{
png_free(png_ptr, info_ptr->hist);
info_ptr->hist = NULL;
info_ptr->valid &= ~PNG_INFO_hIST;
}
#endif
if (((mask & PNG_FREE_PLTE) & info_ptr->free_me) != 0)
{
png_free(png_ptr, info_ptr->palette);
info_ptr->palette = NULL;
info_ptr->valid &= ~PNG_INFO_PLTE;
info_ptr->num_palette = 0;
}
#ifdef PNG_INFO_IMAGE_SUPPORTED
if (((mask & PNG_FREE_ROWS) & info_ptr->free_me) != 0)
{
if (info_ptr->row_pointers != 0)
{
png_uint_32 row;
for (row = 0; row < info_ptr->height; row++)
png_free(png_ptr, info_ptr->row_pointers[row]);
png_free(png_ptr, info_ptr->row_pointers);
info_ptr->row_pointers = NULL;
}
info_ptr->valid &= ~PNG_INFO_IDAT;
}
#endif
if (num != -1)
mask &= ~PNG_FREE_MUL;
info_ptr->free_me &= ~mask;
}
#endif
png_voidp PNGAPI
png_get_io_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return (NULL);
return (png_ptr->io_ptr);
}
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
# ifdef PNG_STDIO_SUPPORTED
void PNGAPI
png_init_io(png_structrp png_ptr, png_FILE_p fp)
{
png_debug(1, "in png_init_io");
if (png_ptr == NULL)
return;
png_ptr->io_ptr = (png_voidp)fp;
}
# endif
# ifdef PNG_SAVE_INT_32_SUPPORTED
void PNGAPI
png_save_int_32(png_bytep buf, png_int_32 i)
{
png_save_uint_32(buf, i);
}
# endif
# ifdef PNG_TIME_RFC1123_SUPPORTED
int PNGAPI
png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
{
static PNG_CONST char short_months[12][4] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if (out == NULL)
return 0;
if (ptime->year > 9999 ||
ptime->month == 0 || ptime->month > 12 ||
ptime->day == 0 || ptime->day > 31 ||
ptime->hour > 23 || ptime->minute > 59 ||
ptime->second > 60)
return 0;
{
size_t pos = 0;
char number_buf[5];
# define APPEND_STRING(string) pos = png_safecat(out, 29, pos, (string))
# define APPEND_NUMBER(format, value)\
APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value)))
# define APPEND(ch) if (pos < 28) out[pos++] = (ch)
APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day);
APPEND(' ');
APPEND_STRING(short_months[(ptime->month - 1)]);
APPEND(' ');
APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year);
APPEND(' ');
APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour);
APPEND(':');
APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute);
APPEND(':');
APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second);
APPEND_STRING(" +0000");
PNG_UNUSED (pos)
# undef APPEND
# undef APPEND_NUMBER
# undef APPEND_STRING
}
return 1;
}
# if PNG_LIBPNG_VER < 10700
png_const_charp PNGAPI
png_convert_to_rfc1123(png_structrp png_ptr, png_const_timep ptime)
{
if (png_ptr != NULL)
{
if (png_convert_to_rfc1123_buffer(png_ptr->time_buffer, ptime) == 0)
png_warning(png_ptr, "Ignoring invalid time value");
else
return png_ptr->time_buffer;
}
return NULL;
}
# endif
# endif
#endif
png_const_charp PNGAPI
png_get_copyright(png_const_structrp png_ptr)
{
PNG_UNUSED(png_ptr)
#ifdef PNG_STRING_COPYRIGHT
return PNG_STRING_COPYRIGHT
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.20 - December 3, 2015" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2015 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.6.20 - December 3, 2015\
Copyright (c) 1998-2015 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
# endif
#endif
}
png_const_charp PNGAPI
png_get_libpng_ver(png_const_structrp png_ptr)
{
return png_get_header_ver(png_ptr);
}
png_const_charp PNGAPI
png_get_header_ver(png_const_structrp png_ptr)
{
PNG_UNUSED(png_ptr)
return PNG_LIBPNG_VER_STRING;
}
png_const_charp PNGAPI
png_get_header_version(png_const_structrp png_ptr)
{
PNG_UNUSED(png_ptr)
#ifdef __STDC__
return PNG_HEADER_VERSION_STRING
# ifndef PNG_READ_SUPPORTED
" (NO READ SUPPORT)"
# endif
PNG_STRING_NEWLINE;
#else
return PNG_HEADER_VERSION_STRING;
#endif
}
#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
void PNGAPI
png_build_grayscale_palette(int bit_depth, png_colorp palette)
{
int num_palette;
int color_inc;
int i;
int v;
png_debug(1, "in png_do_build_grayscale_palette");
if (palette == NULL)
return;
switch (bit_depth)
{
case 1:
num_palette = 2;
color_inc = 0xff;
break;
case 2:
num_palette = 4;
color_inc = 0x55;
break;
case 4:
num_palette = 16;
color_inc = 0x11;
break;
case 8:
num_palette = 256;
color_inc = 1;
break;
default:
num_palette = 0;
color_inc = 0;
break;
}
for (i = 0, v = 0; i < num_palette; i++, v += color_inc)
{
palette[i].red = (png_byte)(v & 0xff);
palette[i].green = (png_byte)(v & 0xff);
palette[i].blue = (png_byte)(v & 0xff);
}
}
#endif
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
int PNGAPI
png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name)
{
png_const_bytep p, p_end;
if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list == 0)
return PNG_HANDLE_CHUNK_AS_DEFAULT;
p_end = png_ptr->chunk_list;
p = p_end + png_ptr->num_chunk_list*5;
do
{
p -= 5;
if (memcmp(chunk_name, p, 4) == 0)
return p[4];
}
while (p > p_end);
return PNG_HANDLE_CHUNK_AS_DEFAULT;
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
int
png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name)
{
png_byte chunk_string[5];
PNG_CSTRING_FROM_CHUNK(chunk_string, chunk_name);
return png_handle_as_unknown(png_ptr, chunk_string);
}
#endif
#endif
#ifdef PNG_READ_SUPPORTED
int PNGAPI
png_reset_zstream(png_structrp png_ptr)
{
if (png_ptr == NULL)
return Z_STREAM_ERROR;
return (inflateReset(&png_ptr->zstream));
}
#endif
png_uint_32 PNGAPI
png_access_version_number(void)
{
return((png_uint_32)PNG_LIBPNG_VER);
}
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
void
png_zstream_error(png_structrp png_ptr, int ret)
{
if (png_ptr->zstream.msg == NULL) switch (ret)
{
default:
case Z_OK:
png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return code");
break;
case Z_STREAM_END:
png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected end of LZ stream");
break;
case Z_NEED_DICT:
png_ptr->zstream.msg = PNGZ_MSG_CAST("missing LZ dictionary");
break;
case Z_ERRNO:
png_ptr->zstream.msg = PNGZ_MSG_CAST("zlib IO error");
break;
case Z_STREAM_ERROR:
png_ptr->zstream.msg = PNGZ_MSG_CAST("bad parameters to zlib");
break;
case Z_DATA_ERROR:
png_ptr->zstream.msg = PNGZ_MSG_CAST("damaged LZ stream");
break;
case Z_MEM_ERROR:
png_ptr->zstream.msg = PNGZ_MSG_CAST("insufficient memory");
break;
case Z_BUF_ERROR:
png_ptr->zstream.msg = PNGZ_MSG_CAST("truncated");
break;
case Z_VERSION_ERROR:
png_ptr->zstream.msg = PNGZ_MSG_CAST("unsupported zlib version");
break;
case PNG_UNEXPECTED_ZLIB_RETURN:
png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return");
break;
}
}
#ifdef PNG_GAMMA_SUPPORTED
static int
png_colorspace_check_gamma(png_const_structrp png_ptr,
png_colorspacerp colorspace, png_fixed_point gAMA, int from)
{
png_fixed_point gtest;
if ((colorspace->flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
(png_muldiv(>est, colorspace->gamma, PNG_FP_1, gAMA) == 0 ||
png_gamma_significant(gtest) != 0))
{
if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0 || from == 2)
{
png_chunk_report(png_ptr, "gamma value does not match sRGB",
PNG_CHUNK_ERROR);
return from == 2;
}
else
{
png_chunk_report(png_ptr, "gamma value does not match libpng estimate",
PNG_CHUNK_WARNING);
return from == 1;
}
}
return 1;
}
void
png_colorspace_set_gamma(png_const_structrp png_ptr,
png_colorspacerp colorspace, png_fixed_point gAMA)
{
png_const_charp errmsg;
if (gAMA < 16 || gAMA > 625000000)
errmsg = "gamma value out of range";
# ifdef PNG_READ_gAMA_SUPPORTED
else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
(colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0)
errmsg = "duplicate";
# endif
else if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
return;
else
{
if (png_colorspace_check_gamma(png_ptr, colorspace, gAMA,
1) != 0)
{
colorspace->gamma = gAMA;
colorspace->flags |=
(PNG_COLORSPACE_HAVE_GAMMA | PNG_COLORSPACE_FROM_gAMA);
}
return;
}
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_chunk_report(png_ptr, errmsg, PNG_CHUNK_WRITE_ERROR);
}
void
png_colorspace_sync_info(png_const_structrp png_ptr, png_inforp info_ptr)
{
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
{
info_ptr->valid &= ~(PNG_INFO_gAMA|PNG_INFO_cHRM|PNG_INFO_sRGB|
PNG_INFO_iCCP);
# ifdef PNG_COLORSPACE_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1);
# else
PNG_UNUSED(png_ptr)
# endif
}
else
{
# ifdef PNG_COLORSPACE_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) != 0)
info_ptr->valid |= PNG_INFO_sRGB;
else
info_ptr->valid &= ~PNG_INFO_sRGB;
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
info_ptr->valid |= PNG_INFO_cHRM;
else
info_ptr->valid &= ~PNG_INFO_cHRM;
# endif
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0)
info_ptr->valid |= PNG_INFO_gAMA;
else
info_ptr->valid &= ~PNG_INFO_gAMA;
}
}
#ifdef PNG_READ_SUPPORTED
void
png_colorspace_sync(png_const_structrp png_ptr, png_inforp info_ptr)
{
if (info_ptr == NULL)
return;
info_ptr->colorspace = png_ptr->colorspace;
png_colorspace_sync_info(png_ptr, info_ptr);
}
#endif
#endif
#ifdef PNG_COLORSPACE_SUPPORTED
static int
png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ)
{
png_int_32 d, dwhite, whiteX, whiteY;
d = XYZ->red_X + XYZ->red_Y + XYZ->red_Z;
if (png_muldiv(&xy->redx, XYZ->red_X, PNG_FP_1, d) == 0)
return 1;
if (png_muldiv(&xy->redy, XYZ->red_Y, PNG_FP_1, d) == 0)
return 1;
dwhite = d;
whiteX = XYZ->red_X;
whiteY = XYZ->red_Y;
d = XYZ->green_X + XYZ->green_Y + XYZ->green_Z;
if (png_muldiv(&xy->greenx, XYZ->green_X, PNG_FP_1, d) == 0)
return 1;
if (png_muldiv(&xy->greeny, XYZ->green_Y, PNG_FP_1, d) == 0)
return 1;
dwhite += d;
whiteX += XYZ->green_X;
whiteY += XYZ->green_Y;
d = XYZ->blue_X + XYZ->blue_Y + XYZ->blue_Z;
if (png_muldiv(&xy->bluex, XYZ->blue_X, PNG_FP_1, d) == 0)
return 1;
if (png_muldiv(&xy->bluey, XYZ->blue_Y, PNG_FP_1, d) == 0)
return 1;
dwhite += d;
whiteX += XYZ->blue_X;
whiteY += XYZ->blue_Y;
if (png_muldiv(&xy->whitex, whiteX, PNG_FP_1, dwhite) == 0)
return 1;
if (png_muldiv(&xy->whitey, whiteY, PNG_FP_1, dwhite) == 0)
return 1;
return 0;
}
static int
png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
{
png_fixed_point red_inverse, green_inverse, blue_scale;
png_fixed_point left, right, denominator;
if (xy->redx < 0 || xy->redx > PNG_FP_1) return 1;
if (xy->redy < 0 || xy->redy > PNG_FP_1-xy->redx) return 1;
if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1;
if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1;
if (xy->bluex < 0 || xy->bluex > PNG_FP_1) return 1;
if (xy->bluey < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1;
if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1;
if (xy->whitey < 5 || xy->whitey > PNG_FP_1-xy->whitex) return 1;
if (png_muldiv(&left, xy->greenx-xy->bluex, xy->redy - xy->bluey, 7) == 0)
return 2;
if (png_muldiv(&right, xy->greeny-xy->bluey, xy->redx - xy->bluex, 7) == 0)
return 2;
denominator = left - right;
if (png_muldiv(&left, xy->greenx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
return 2;
if (png_muldiv(&right, xy->greeny-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
return 2;
if (png_muldiv(&red_inverse, xy->whitey, denominator, left-right) == 0 ||
red_inverse <= xy->whitey )
return 1;
if (png_muldiv(&left, xy->redy-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
return 2;
if (png_muldiv(&right, xy->redx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
return 2;
if (png_muldiv(&green_inverse, xy->whitey, denominator, left-right) == 0 ||
green_inverse <= xy->whitey)
return 1;
blue_scale = png_reciprocal(xy->whitey) - png_reciprocal(red_inverse) -
png_reciprocal(green_inverse);
if (blue_scale <= 0)
return 1;
if (png_muldiv(&XYZ->red_X, xy->redx, PNG_FP_1, red_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->red_Y, xy->redy, PNG_FP_1, red_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->red_Z, PNG_FP_1 - xy->redx - xy->redy, PNG_FP_1,
red_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->green_X, xy->greenx, PNG_FP_1, green_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->green_Y, xy->greeny, PNG_FP_1, green_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->green_Z, PNG_FP_1 - xy->greenx - xy->greeny, PNG_FP_1,
green_inverse) == 0)
return 1;
if (png_muldiv(&XYZ->blue_X, xy->bluex, blue_scale, PNG_FP_1) == 0)
return 1;
if (png_muldiv(&XYZ->blue_Y, xy->bluey, blue_scale, PNG_FP_1) == 0)
return 1;
if (png_muldiv(&XYZ->blue_Z, PNG_FP_1 - xy->bluex - xy->bluey, blue_scale,
PNG_FP_1) == 0)
return 1;
return 0;
}
static int
png_XYZ_normalize(png_XYZ *XYZ)
{
png_int_32 Y;
if (XYZ->red_Y < 0 || XYZ->green_Y < 0 || XYZ->blue_Y < 0 ||
XYZ->red_X < 0 || XYZ->green_X < 0 || XYZ->blue_X < 0 ||
XYZ->red_Z < 0 || XYZ->green_Z < 0 || XYZ->blue_Z < 0)
return 1;
Y = XYZ->red_Y;
if (0x7fffffff - Y < XYZ->green_X)
return 1;
Y += XYZ->green_Y;
if (0x7fffffff - Y < XYZ->blue_X)
return 1;
Y += XYZ->blue_Y;
if (Y != PNG_FP_1)
{
if (png_muldiv(&XYZ->red_X, XYZ->red_X, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->red_Y, XYZ->red_Y, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->red_Z, XYZ->red_Z, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->green_X, XYZ->green_X, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->green_Y, XYZ->green_Y, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->green_Z, XYZ->green_Z, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->blue_X, XYZ->blue_X, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->blue_Y, XYZ->blue_Y, PNG_FP_1, Y) == 0)
return 1;
if (png_muldiv(&XYZ->blue_Z, XYZ->blue_Z, PNG_FP_1, Y) == 0)
return 1;
}
return 0;
}
static int
png_colorspace_endpoints_match(const png_xy *xy1, const png_xy *xy2, int delta)
{
if (PNG_OUT_OF_RANGE(xy1->whitex, xy2->whitex,delta) ||
PNG_OUT_OF_RANGE(xy1->whitey, xy2->whitey,delta) ||
PNG_OUT_OF_RANGE(xy1->redx, xy2->redx, delta) ||
PNG_OUT_OF_RANGE(xy1->redy, xy2->redy, delta) ||
PNG_OUT_OF_RANGE(xy1->greenx, xy2->greenx,delta) ||
PNG_OUT_OF_RANGE(xy1->greeny, xy2->greeny,delta) ||
PNG_OUT_OF_RANGE(xy1->bluex, xy2->bluex, delta) ||
PNG_OUT_OF_RANGE(xy1->bluey, xy2->bluey, delta))
return 0;
return 1;
}
static int
png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy)
{
int result;
png_xy xy_test;
result = png_XYZ_from_xy(XYZ, xy);
if (result != 0)
return result;
result = png_xy_from_XYZ(&xy_test, XYZ);
if (result != 0)
return result;
if (png_colorspace_endpoints_match(xy, &xy_test,
5) != 0)
return 0;
return 1;
}
static int
png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ)
{
int result;
png_XYZ XYZtemp;
result = png_XYZ_normalize(XYZ);
if (result != 0)
return result;
result = png_xy_from_XYZ(xy, XYZ);
if (result != 0)
return result;
XYZtemp = *XYZ;
return png_colorspace_check_xy(&XYZtemp, xy);
}
static const png_xy sRGB_xy =
{
64000, 33000,
30000, 60000,
15000, 6000,
31270, 32900
};
static int
png_colorspace_set_xy_and_XYZ(png_const_structrp png_ptr,
png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ,
int preferred)
{
if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
return 0;
if (preferred < 2 &&
(colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
if (png_colorspace_endpoints_match(xy, &colorspace->end_points_xy,
100) == 0)
{
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_benign_error(png_ptr, "inconsistent chromaticities");
return 0;
}
if (preferred == 0)
return 1;
}
colorspace->end_points_xy = *xy;
colorspace->end_points_XYZ = *XYZ;
colorspace->flags |= PNG_COLORSPACE_HAVE_ENDPOINTS;
if (png_colorspace_endpoints_match(xy, &sRGB_xy, 1000) != 0)
colorspace->flags |= PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB;
else
colorspace->flags &= PNG_COLORSPACE_CANCEL(
PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB);
return 2;
}
int
png_colorspace_set_chromaticities(png_const_structrp png_ptr,
png_colorspacerp colorspace, const png_xy *xy, int preferred)
{
png_XYZ XYZ;
switch (png_colorspace_check_xy(&XYZ, xy))
{
case 0:
return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, xy, &XYZ,
preferred);
case 1:
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_benign_error(png_ptr, "invalid chromaticities");
break;
default:
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_error(png_ptr, "internal error checking chromaticities");
}
return 0;
}
int
png_colorspace_set_endpoints(png_const_structrp png_ptr,
png_colorspacerp colorspace, const png_XYZ *XYZ_in, int preferred)
{
png_XYZ XYZ = *XYZ_in;
png_xy xy;
switch (png_colorspace_check_XYZ(&xy, &XYZ))
{
case 0:
return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, &xy, &XYZ,
preferred);
case 1:
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_benign_error(png_ptr, "invalid end points");
break;
default:
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_error(png_ptr, "internal error checking chromaticities");
}
return 0;
}
#if defined(PNG_sRGB_SUPPORTED) || defined(PNG_iCCP_SUPPORTED)
static char
png_icc_tag_char(png_uint_32 byte)
{
byte &= 0xff;
if (byte >= 32 && byte <= 126)
return (char)byte;
else
return '?';
}
static void
png_icc_tag_name(char *name, png_uint_32 tag)
{
name[0] = '\'';
name[1] = png_icc_tag_char(tag >> 24);
name[2] = png_icc_tag_char(tag >> 16);
name[3] = png_icc_tag_char(tag >> 8);
name[4] = png_icc_tag_char(tag );
name[5] = '\'';
}
static int
is_ICC_signature_char(png_alloc_size_t it)
{
return it == 32 || (it >= 48 && it <= 57) || (it >= 65 && it <= 90) ||
(it >= 97 && it <= 122);
}
static int
is_ICC_signature(png_alloc_size_t it)
{
return is_ICC_signature_char(it >> 24) &&
is_ICC_signature_char((it >> 16) & 0xff) &&
is_ICC_signature_char((it >> 8) & 0xff) &&
is_ICC_signature_char(it & 0xff);
}
static int
png_icc_profile_error(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_alloc_size_t value, png_const_charp reason)
{
size_t pos;
char message[196];
if (colorspace != NULL)
colorspace->flags |= PNG_COLORSPACE_INVALID;
pos = png_safecat(message, (sizeof message), 0, "profile '");
pos = png_safecat(message, pos+79, pos, name);
pos = png_safecat(message, (sizeof message), pos, "': ");
if (is_ICC_signature(value) != 0)
{
png_icc_tag_name(message+pos, (png_uint_32)value);
pos += 6;
message[pos++] = ':';
message[pos++] = ' ';
}
# ifdef PNG_WARNINGS_SUPPORTED
else
{
char number[PNG_NUMBER_BUFFER_SIZE];
pos = png_safecat(message, (sizeof message), pos,
png_format_number(number, number+(sizeof number),
PNG_NUMBER_FORMAT_x, value));
pos = png_safecat(message, (sizeof message), pos, "h: ");
}
# endif
pos = png_safecat(message, (sizeof message), pos, reason);
PNG_UNUSED(pos)
png_chunk_report(png_ptr, message,
(colorspace != NULL) ? PNG_CHUNK_ERROR : PNG_CHUNK_WRITE_ERROR);
return 0;
}
#endif
#ifdef PNG_sRGB_SUPPORTED
int
png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace,
int intent)
{
static const png_XYZ sRGB_XYZ =
{
41239, 21264, 1933,
35758, 71517, 11919,
18048, 7219, 95053
};
if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
return 0;
if (intent < 0 || intent >= PNG_sRGB_INTENT_LAST)
return png_icc_profile_error(png_ptr, colorspace, "sRGB",
(unsigned)intent, "invalid sRGB rendering intent");
if ((colorspace->flags & PNG_COLORSPACE_HAVE_INTENT) != 0 &&
colorspace->rendering_intent != intent)
return png_icc_profile_error(png_ptr, colorspace, "sRGB",
(unsigned)intent, "inconsistent rendering intents");
if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0)
{
png_benign_error(png_ptr, "duplicate sRGB information ignored");
return 0;
}
if ((colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0 &&
!png_colorspace_endpoints_match(&sRGB_xy, &colorspace->end_points_xy,
100))
png_chunk_report(png_ptr, "cHRM chunk does not match sRGB",
PNG_CHUNK_ERROR);
(void)png_colorspace_check_gamma(png_ptr, colorspace, PNG_GAMMA_sRGB_INVERSE,
2);
colorspace->rendering_intent = (png_uint_16)intent;
colorspace->flags |= PNG_COLORSPACE_HAVE_INTENT;
colorspace->end_points_xy = sRGB_xy;
colorspace->end_points_XYZ = sRGB_XYZ;
colorspace->flags |=
(PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB);
colorspace->gamma = PNG_GAMMA_sRGB_INVERSE;
colorspace->flags |= PNG_COLORSPACE_HAVE_GAMMA;
colorspace->flags |=
(PNG_COLORSPACE_MATCHES_sRGB|PNG_COLORSPACE_FROM_sRGB);
return 1;
}
#endif
#ifdef PNG_iCCP_SUPPORTED
static const png_byte D50_nCIEXYZ[12] =
{ 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d };
int
png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_uint_32 profile_length)
{
if (profile_length < 132)
return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
"too short");
return 1;
}
int
png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_uint_32 profile_length,
png_const_bytep profile, int color_type)
{
png_uint_32 temp;
temp = png_get_uint_32(profile);
if (temp != profile_length)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"length does not match profile");
temp = (png_uint_32) (*(profile+8));
if (temp > 3 && (profile_length & 3))
return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
"invalid length");
temp = png_get_uint_32(profile+128);
if (temp > 357913930 ||
profile_length < 132+12*temp)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"tag count too large");
temp = png_get_uint_32(profile+64);
if (temp >= 0xffff)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"invalid rendering intent");
if (temp >= PNG_sRGB_INTENT_LAST)
(void)png_icc_profile_error(png_ptr, NULL, name, temp,
"intent outside defined range");
temp = png_get_uint_32(profile+36);
if (temp != 0x61637370)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"invalid signature");
if (memcmp(profile+68, D50_nCIEXYZ, 12) != 0)
(void)png_icc_profile_error(png_ptr, NULL, name, 0,
"PCS illuminant is not D50");
temp = png_get_uint_32(profile+16);
switch (temp)
{
case 0x52474220:
if ((color_type & PNG_COLOR_MASK_COLOR) == 0)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"RGB color space not permitted on grayscale PNG");
break;
case 0x47524159:
if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"Gray color space not permitted on RGB PNG");
break;
default:
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"invalid ICC profile color space");
}
temp = png_get_uint_32(profile+12);
switch (temp)
{
case 0x73636e72:
case 0x6d6e7472:
case 0x70727472:
case 0x73706163:
break;
case 0x61627374:
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"invalid embedded Abstract ICC profile");
case 0x6c696e6b:
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"unexpected DeviceLink ICC profile class");
case 0x6e6d636c:
(void)png_icc_profile_error(png_ptr, NULL, name, temp,
"unexpected NamedColor ICC profile class");
break;
default:
(void)png_icc_profile_error(png_ptr, NULL, name, temp,
"unrecognized ICC profile class");
break;
}
temp = png_get_uint_32(profile+20);
switch (temp)
{
case 0x58595a20:
case 0x4c616220:
break;
default:
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"unexpected ICC PCS encoding");
}
return 1;
}
int
png_icc_check_tag_table(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_uint_32 profile_length,
png_const_bytep profile )
{
png_uint_32 tag_count = png_get_uint_32(profile+128);
png_uint_32 itag;
png_const_bytep tag = profile+132;
for (itag=0; itag < tag_count; ++itag, tag += 12)
{
png_uint_32 tag_id = png_get_uint_32(tag+0);
png_uint_32 tag_start = png_get_uint_32(tag+4);
png_uint_32 tag_length = png_get_uint_32(tag+8);
if ((tag_start & 3) != 0)
{
(void)png_icc_profile_error(png_ptr, NULL, name, tag_id,
"ICC profile tag start not a multiple of 4");
}
if (tag_start > profile_length || tag_length > profile_length - tag_start)
return png_icc_profile_error(png_ptr, colorspace, name, tag_id,
"ICC profile tag outside profile");
}
return 1;
}
#ifdef PNG_sRGB_SUPPORTED
#if PNG_sRGB_PROFILE_CHECKS >= 0
static const struct
{
png_uint_32 adler, crc, length;
png_uint_32 md5[4];
png_byte have_md5;
png_byte is_broken;
png_uint_16 intent;
# define PNG_MD5(a,b,c,d) { a, b, c, d }, (a!=0)||(b!=0)||(c!=0)||(d!=0)
# define PNG_ICC_CHECKSUM(adler, crc, md5, intent, broke, date, length, fname)\
{ adler, crc, length, md5, broke, intent },
} png_sRGB_checks[] =
{
PNG_ICC_CHECKSUM(0x0a3fd9f6, 0x3b8772b9,
PNG_MD5(0x29f83dde, 0xaff255ae, 0x7842fae4, 0xca83390d), 0, 0,
"2009/03/27 21:36:31", 3048, "sRGB_IEC61966-2-1_black_scaled.icc")
PNG_ICC_CHECKSUM(0x4909e5e1, 0x427ebb21,
PNG_MD5(0xc95bd637, 0xe95d8a3b, 0x0df38f99, 0xc1320389), 1, 0,
"2009/03/27 21:37:45", 3052, "sRGB_IEC61966-2-1_no_black_scaling.icc")
PNG_ICC_CHECKSUM(0xfd2144a1, 0x306fd8ae,
PNG_MD5(0xfc663378, 0x37e2886b, 0xfd72e983, 0x8228f1b8), 0, 0,
"2009/08/10 17:28:01", 60988, "sRGB_v4_ICC_preference_displayclass.icc")
PNG_ICC_CHECKSUM(0x209c35d2, 0xbbef7812,
PNG_MD5(0x34562abf, 0x994ccd06, 0x6d2c5721, 0xd0d68c5d), 0, 0,
"2007/07/25 00:05:37", 60960, "sRGB_v4_ICC_preference.icc")
PNG_ICC_CHECKSUM(0xa054d762, 0x5d5129ce,
PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 0,
"2004/07/21 18:57:42", 3024, "sRGB_IEC61966-2-1_noBPC.icc")
PNG_ICC_CHECKSUM(0xf784f3fb, 0x182ea552,
PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 0, 1,
"1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 perceptual")
PNG_ICC_CHECKSUM(0x0398f3fc, 0xf29e526d,
PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 1,
"1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 media-relative")
};
static int
png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
png_const_bytep profile, uLong adler)
{
png_uint_32 length = 0;
png_uint_32 intent = 0x10000;
#if PNG_sRGB_PROFILE_CHECKS > 1
uLong crc = 0;
#endif
unsigned int i;
#ifdef PNG_SET_OPTION_SUPPORTED
if (((png_ptr->options >> PNG_SKIP_sRGB_CHECK_PROFILE) & 3) ==
PNG_OPTION_ON)
return 0;
#endif
for (i=0; i < (sizeof png_sRGB_checks) / (sizeof png_sRGB_checks[0]); ++i)
{
if (png_get_uint_32(profile+84) == png_sRGB_checks[i].md5[0] &&
png_get_uint_32(profile+88) == png_sRGB_checks[i].md5[1] &&
png_get_uint_32(profile+92) == png_sRGB_checks[i].md5[2] &&
png_get_uint_32(profile+96) == png_sRGB_checks[i].md5[3])
{
# if PNG_sRGB_PROFILE_CHECKS == 0
if (png_sRGB_checks[i].have_md5 != 0)
return 1+png_sRGB_checks[i].is_broken;
# endif
if (length == 0)
{
length = png_get_uint_32(profile);
intent = png_get_uint_32(profile+64);
}
if (length == (png_uint_32) png_sRGB_checks[i].length &&
intent == (png_uint_32) png_sRGB_checks[i].intent)
{
if (adler == 0)
{
adler = adler32(0, NULL, 0);
adler = adler32(adler, profile, length);
}
if (adler == png_sRGB_checks[i].adler)
{
# if PNG_sRGB_PROFILE_CHECKS > 1
if (crc == 0)
{
crc = crc32(0, NULL, 0);
crc = crc32(crc, profile, length);
}
if (crc == png_sRGB_checks[i].crc)
# endif
{
if (png_sRGB_checks[i].is_broken != 0)
{
png_chunk_report(png_ptr, "known incorrect sRGB profile",
PNG_CHUNK_ERROR);
}
else if (png_sRGB_checks[i].have_md5 == 0)
{
png_chunk_report(png_ptr,
"out-of-date sRGB profile with no signature",
PNG_CHUNK_WARNING);
}
return 1+png_sRGB_checks[i].is_broken;
}
}
# if PNG_sRGB_PROFILE_CHECKS > 0
png_chunk_report(png_ptr,
"Not recognizing known sRGB profile that has been edited",
PNG_CHUNK_WARNING);
break;
# endif
}
}
}
return 0;
}
#endif
void
png_icc_set_sRGB(png_const_structrp png_ptr,
png_colorspacerp colorspace, png_const_bytep profile, uLong adler)
{
#if PNG_sRGB_PROFILE_CHECKS >= 0
if (png_compare_ICC_profile_with_sRGB(png_ptr, profile, adler) != 0)
#endif
(void)png_colorspace_set_sRGB(png_ptr, colorspace,
(int)png_get_uint_32(profile+64));
}
#endif
int
png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_uint_32 profile_length, png_const_bytep profile,
int color_type)
{
if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
return 0;
if (png_icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
png_icc_check_header(png_ptr, colorspace, name, profile_length, profile,
color_type) != 0 &&
png_icc_check_tag_table(png_ptr, colorspace, name, profile_length,
profile) != 0)
{
# ifdef PNG_sRGB_SUPPORTED
png_icc_set_sRGB(png_ptr, colorspace, profile, 0);
# endif
return 1;
}
return 0;
}
#endif
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
void
png_colorspace_set_rgb_coefficients(png_structrp png_ptr)
{
if (png_ptr->rgb_to_gray_coefficients_set == 0 &&
(png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
png_fixed_point r = png_ptr->colorspace.end_points_XYZ.red_Y;
png_fixed_point g = png_ptr->colorspace.end_points_XYZ.green_Y;
png_fixed_point b = png_ptr->colorspace.end_points_XYZ.blue_Y;
png_fixed_point total = r+g+b;
if (total > 0 &&
r >= 0 && png_muldiv(&r, r, 32768, total) && r >= 0 && r <= 32768 &&
g >= 0 && png_muldiv(&g, g, 32768, total) && g >= 0 && g <= 32768 &&
b >= 0 && png_muldiv(&b, b, 32768, total) && b >= 0 && b <= 32768 &&
r+g+b <= 32769)
{
int add = 0;
if (r+g+b > 32768)
add = -1;
else if (r+g+b < 32768)
add = 1;
if (add != 0)
{
if (g >= r && g >= b)
g += add;
else if (r >= g && r >= b)
r += add;
else
b += add;
}
if (r+g+b != 32768)
png_error(png_ptr,
"internal error handling cHRM coefficients");
else
{
png_ptr->rgb_to_gray_red_coeff = (png_uint_16)r;
png_ptr->rgb_to_gray_green_coeff = (png_uint_16)g;
}
}
else
png_error(png_ptr, "internal error handling cHRM->XYZ");
}
}
#endif
#endif
#ifdef __GNUC__
static int
png_gt(size_t a, size_t b)
{
return a > b;
}
#else
# define png_gt(a,b) ((a) > (b))
#endif
void
png_check_IHDR(png_const_structrp png_ptr,
png_uint_32 width, png_uint_32 height, int bit_depth,
int color_type, int interlace_type, int compression_type,
int filter_type)
{
int error = 0;
if (width == 0)
{
png_warning(png_ptr, "Image width is zero in IHDR");
error = 1;
}
if (width > PNG_UINT_31_MAX)
{
png_warning(png_ptr, "Invalid image width in IHDR");
error = 1;
}
if (png_gt(((width + 7) & (~7)),
((PNG_SIZE_MAX
- 48
- 1)
/ 8)
- 1))
{
png_warning(png_ptr, "Image width is too large for this architecture");
error = 1;
}
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (width > png_ptr->user_width_max)
#else
if (width > PNG_USER_WIDTH_MAX)
#endif
{
png_warning(png_ptr, "Image width exceeds user limit in IHDR");
error = 1;
}
if (height == 0)
{
png_warning(png_ptr, "Image height is zero in IHDR");
error = 1;
}
if (height > PNG_UINT_31_MAX)
{
png_warning(png_ptr, "Invalid image height in IHDR");
error = 1;
}
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (height > png_ptr->user_height_max)
#else
if (height > PNG_USER_HEIGHT_MAX)
#endif
{
png_warning(png_ptr, "Image height exceeds user limit in IHDR");
error = 1;
}
if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
bit_depth != 8 && bit_depth != 16)
{
png_warning(png_ptr, "Invalid bit depth in IHDR");
error = 1;
}
if (color_type < 0 || color_type == 1 ||
color_type == 5 || color_type > 6)
{
png_warning(png_ptr, "Invalid color type in IHDR");
error = 1;
}
if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
((color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
{
png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
error = 1;
}
if (interlace_type >= PNG_INTERLACE_LAST)
{
png_warning(png_ptr, "Unknown interlace method in IHDR");
error = 1;
}
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
{
png_warning(png_ptr, "Unknown compression method in IHDR");
error = 1;
}
#ifdef PNG_MNG_FEATURES_SUPPORTED
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 &&
png_ptr->mng_features_permitted != 0)
png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
if (filter_type != PNG_FILTER_TYPE_BASE)
{
if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
(filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
(color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
{
png_warning(png_ptr, "Unknown filter method in IHDR");
error = 1;
}
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0)
{
png_warning(png_ptr, "Invalid filter method in IHDR");
error = 1;
}
}
#else
if (filter_type != PNG_FILTER_TYPE_BASE)
{
png_warning(png_ptr, "Unknown filter method in IHDR");
error = 1;
}
#endif
if (error == 1)
png_error(png_ptr, "Invalid IHDR data");
}
#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
#define png_fp_add(state, flags) ((state) |= (flags))
#define png_fp_set(state, value) ((state) = (value) | ((state) & PNG_FP_STICKY))
int
png_check_fp_number(png_const_charp string, png_size_t size, int *statep,
png_size_tp whereami)
{
int state = *statep;
png_size_t i = *whereami;
while (i < size)
{
int type;
switch (string[i])
{
case 43: type = PNG_FP_SAW_SIGN; break;
case 45: type = PNG_FP_SAW_SIGN + PNG_FP_NEGATIVE; break;
case 46: type = PNG_FP_SAW_DOT; break;
case 48: type = PNG_FP_SAW_DIGIT; break;
case 49: case 50: case 51: case 52:
case 53: case 54: case 55: case 56:
case 57: type = PNG_FP_SAW_DIGIT + PNG_FP_NONZERO; break;
case 69:
case 101: type = PNG_FP_SAW_E; break;
default: goto PNG_FP_End;
}
switch ((state & PNG_FP_STATE) + (type & PNG_FP_SAW_ANY))
{
case PNG_FP_INTEGER + PNG_FP_SAW_SIGN:
if ((state & PNG_FP_SAW_ANY) != 0)
goto PNG_FP_End;
png_fp_add(state, type);
break;
case PNG_FP_INTEGER + PNG_FP_SAW_DOT:
if ((state & PNG_FP_SAW_DOT) != 0)
goto PNG_FP_End;
else if ((state & PNG_FP_SAW_DIGIT) != 0)
png_fp_add(state, type);
else
png_fp_set(state, PNG_FP_FRACTION | type);
break;
case PNG_FP_INTEGER + PNG_FP_SAW_DIGIT:
if ((state & PNG_FP_SAW_DOT) != 0)
png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT);
png_fp_add(state, type | PNG_FP_WAS_VALID);
break;
case PNG_FP_INTEGER + PNG_FP_SAW_E:
if ((state & PNG_FP_SAW_DIGIT) == 0)
goto PNG_FP_End;
png_fp_set(state, PNG_FP_EXPONENT);
break;
case PNG_FP_FRACTION + PNG_FP_SAW_DIGIT:
png_fp_add(state, type | PNG_FP_WAS_VALID);
break;
case PNG_FP_FRACTION + PNG_FP_SAW_E:
if ((state & PNG_FP_SAW_DIGIT) == 0)
goto PNG_FP_End;
png_fp_set(state, PNG_FP_EXPONENT);
break;
case PNG_FP_EXPONENT + PNG_FP_SAW_SIGN:
if ((state & PNG_FP_SAW_ANY) != 0)
goto PNG_FP_End;
png_fp_add(state, PNG_FP_SAW_SIGN);
break;
case PNG_FP_EXPONENT + PNG_FP_SAW_DIGIT:
png_fp_add(state, PNG_FP_SAW_DIGIT | PNG_FP_WAS_VALID);
break;
default: goto PNG_FP_End;
}
++i;
}
PNG_FP_End:
*statep = state;
*whereami = i;
return (state & PNG_FP_SAW_DIGIT) != 0;
}
int
png_check_fp_string(png_const_charp string, png_size_t size)
{
int state=0;
png_size_t char_index=0;
if (png_check_fp_number(string, size, &state, &char_index) != 0 &&
(char_index == size || string[char_index] == 0))
return state ;
return 0;
}
#endif
#ifdef PNG_sCAL_SUPPORTED
# ifdef PNG_FLOATING_POINT_SUPPORTED
static double
png_pow10(int power)
{
int recip = 0;
double d = 1;
if (power < 0)
{
if (power < DBL_MIN_10_EXP) return 0;
recip = 1, power = -power;
}
if (power > 0)
{
double mult = 10;
do
{
if (power & 1) d *= mult;
mult *= mult;
power >>= 1;
}
while (power > 0);
if (recip != 0) d = 1/d;
}
return d;
}
void
png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
double fp, unsigned int precision)
{
if (precision < 1)
precision = DBL_DIG;
if (precision > DBL_DIG+1)
precision = DBL_DIG+1;
if (size >= precision+5)
{
if (fp < 0)
{
fp = -fp;
*ascii++ = 45;
--size;
}
if (fp >= DBL_MIN && fp <= DBL_MAX)
{
int exp_b10;
double base;
(void)frexp(fp, &exp_b10);
exp_b10 = (exp_b10 * 77) >> 8;
base = png_pow10(exp_b10);
while (base < DBL_MIN || base < fp)
{
double test = png_pow10(exp_b10+1);
if (test <= DBL_MAX)
++exp_b10, base = test;
else
break;
}
fp /= base;
while (fp >= 1) fp /= 10, ++exp_b10;
{
unsigned int czero, clead, cdigits;
char exponent[10];
if (exp_b10 < 0 && exp_b10 > -3)
{
czero = -exp_b10;
exp_b10 = 0;
}
else
czero = 0;
clead = czero;
cdigits = 0;
do
{
double d;
fp *= 10;
if (cdigits+czero+1 < precision+clead)
fp = modf(fp, &d);
else
{
d = floor(fp + .5);
if (d > 9)
{
if (czero > 0)
{
--czero, d = 1;
if (cdigits == 0) --clead;
}
else
{
while (cdigits > 0 && d > 9)
{
int ch = *--ascii;
if (exp_b10 != (-1))
++exp_b10;
else if (ch == 46)
{
ch = *--ascii, ++size;
exp_b10 = 1;
}
--cdigits;
d = ch - 47;
}
if (d > 9)
{
if (exp_b10 == (-1))
{
int ch = *--ascii;
if (ch == 46)
++size, exp_b10 = 1;
}
else
++exp_b10;
d = 1;
}
}
}
fp = 0;
}
if (d == 0)
{
++czero;
if (cdigits == 0) ++clead;
}
else
{
cdigits += czero - clead;
clead = 0;
while (czero > 0)
{
if (exp_b10 != (-1))
{
if (exp_b10 == 0) *ascii++ = 46, --size;
--exp_b10;
}
*ascii++ = 48, --czero;
}
if (exp_b10 != (-1))
{
if (exp_b10 == 0)
*ascii++ = 46, --size;
--exp_b10;
}
*ascii++ = (char)(48 + (int)d), ++cdigits;
}
}
while (cdigits+czero < precision+clead && fp > DBL_MIN);
if (exp_b10 >= (-1) && exp_b10 <= 2)
{
while (--exp_b10 >= 0) *ascii++ = 48;
*ascii = 0;
return;
}
size -= cdigits;
*ascii++ = 69, --size;
{
unsigned int uexp_b10;
if (exp_b10 < 0)
{
*ascii++ = 45, --size;
uexp_b10 = -exp_b10;
}
else
uexp_b10 = exp_b10;
cdigits = 0;
while (uexp_b10 > 0)
{
exponent[cdigits++] = (char)(48 + uexp_b10 % 10);
uexp_b10 /= 10;
}
}
if (size > cdigits)
{
while (cdigits > 0) *ascii++ = exponent[--cdigits];
*ascii = 0;
return;
}
}
}
else if (!(fp >= DBL_MIN))
{
*ascii++ = 48;
*ascii = 0;
return;
}
else
{
*ascii++ = 105;
*ascii++ = 110;
*ascii++ = 102;
*ascii = 0;
return;
}
}
png_error(png_ptr, "ASCII conversion buffer too small");
}
# endif
# ifdef PNG_FIXED_POINT_SUPPORTED
void
png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
png_size_t size, png_fixed_point fp)
{
if (size > 12)
{
png_uint_32 num;
if (fp < 0)
*ascii++ = 45, num = -fp;
else
num = fp;
if (num <= 0x80000000)
{
unsigned int ndigits = 0, first = 16 ;
char digits[10];
while (num)
{
unsigned int tmp = num/10;
num -= tmp*10;
digits[ndigits++] = (char)(48 + num);
if (first == 16 && num > 0)
first = ndigits;
num = tmp;
}
if (ndigits > 0)
{
while (ndigits > 5) *ascii++ = digits[--ndigits];
if (first <= 5)
{
unsigned int i;
*ascii++ = 46;
i = 5;
while (ndigits < i) *ascii++ = 48, --i;
while (ndigits >= first) *ascii++ = digits[--ndigits];
}
}
else
*ascii++ = 48;
*ascii = 0;
return;
}
}
png_error(png_ptr, "ASCII conversion buffer too small");
}
# endif
#endif
#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
!defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
(defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
(defined(PNG_sCAL_SUPPORTED) && \
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
png_fixed_point
png_fixed(png_const_structrp png_ptr, double fp, png_const_charp text)
{
double r = floor(100000 * fp + .5);
if (r > 2147483647. || r < -2147483648.)
png_fixed_error(png_ptr, text);
# ifndef PNG_ERROR_TEXT_SUPPORTED
PNG_UNUSED(text)
# endif
return (png_fixed_point)r;
}
#endif
#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_COLORSPACE_SUPPORTED) ||\
defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
int
png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
png_int_32 divisor)
{
if (divisor != 0)
{
if (a == 0 || times == 0)
{
*res = 0;
return 1;
}
else
{
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = a;
r *= times;
r /= divisor;
r = floor(r+.5);
if (r <= 2147483647. && r >= -2147483648.)
{
*res = (png_fixed_point)r;
return 1;
}
#else
int negative = 0;
png_uint_32 A, T, D;
png_uint_32 s16, s32, s00;
if (a < 0)
negative = 1, A = -a;
else
A = a;
if (times < 0)
negative = !negative, T = -times;
else
T = times;
if (divisor < 0)
negative = !negative, D = -divisor;
else
D = divisor;
s16 = (A >> 16) * (T & 0xffff) +
(A & 0xffff) * (T >> 16);
s32 = (A >> 16) * (T >> 16) + (s16 >> 16);
s00 = (A & 0xffff) * (T & 0xffff);
s16 = (s16 & 0xffff) << 16;
s00 += s16;
if (s00 < s16)
++s32;
if (s32 < D)
{
int bitshift = 32;
png_fixed_point result = 0;
while (--bitshift >= 0)
{
png_uint_32 d32, d00;
if (bitshift > 0)
d32 = D >> (32-bitshift), d00 = D << bitshift;
else
d32 = 0, d00 = D;
if (s32 > d32)
{
if (s00 < d00) --s32;
s32 -= d32, s00 -= d00, result += 1<<bitshift;
}
else
if (s32 == d32 && s00 >= d00)
s32 = 0, s00 -= d00, result += 1<<bitshift;
}
if (s00 >= (D >> 1))
++result;
if (negative != 0)
result = -result;
if ((negative != 0 && result <= 0) ||
(negative == 0 && result >= 0))
{
*res = result;
return 1;
}
}
#endif
}
}
return 0;
}
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
png_fixed_point
png_muldiv_warn(png_const_structrp png_ptr, png_fixed_point a, png_int_32 times,
png_int_32 divisor)
{
png_fixed_point result;
if (png_muldiv(&result, a, times, divisor) != 0)
return result;
png_warning(png_ptr, "fixed point overflow ignored");
return 0;
}
#endif
#ifdef PNG_GAMMA_SUPPORTED
png_fixed_point
png_reciprocal(png_fixed_point a)
{
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = floor(1E10/a+.5);
if (r <= 2147483647. && r >= -2147483648.)
return (png_fixed_point)r;
#else
png_fixed_point res;
if (png_muldiv(&res, 100000, 100000, a) != 0)
return res;
#endif
return 0;
}
int
png_gamma_significant(png_fixed_point gamma_val)
{
return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED ||
gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED;
}
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
#ifdef PNG_16BIT_SUPPORTED
static png_fixed_point
png_product2(png_fixed_point a, png_fixed_point b)
{
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = a * 1E-5;
r *= b;
r = floor(r+.5);
if (r <= 2147483647. && r >= -2147483648.)
return (png_fixed_point)r;
#else
png_fixed_point res;
if (png_muldiv(&res, a, b, 100000) != 0)
return res;
#endif
return 0;
}
#endif
png_fixed_point
png_reciprocal2(png_fixed_point a, png_fixed_point b)
{
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
if (a != 0 && b != 0)
{
double r = 1E15/a;
r /= b;
r = floor(r+.5);
if (r <= 2147483647. && r >= -2147483648.)
return (png_fixed_point)r;
}
#else
png_fixed_point res = png_product2(a, b);
if (res != 0)
return png_reciprocal(res);
#endif
return 0;
}
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
#ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED
static const png_uint_32
png_8bit_l2[128] =
{
4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U,
3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U,
3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U,
3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U,
3205874930U, 3165243125U, 3124876025U, 3084770202U, 3044922296U, 3005329011U,
2965987113U, 2926893432U, 2888044853U, 2849438323U, 2811070844U, 2772939474U,
2735041326U, 2697373562U, 2659933400U, 2622718104U, 2585724991U, 2548951424U,
2512394810U, 2476052606U, 2439922311U, 2404001468U, 2368287663U, 2332778523U,
2297471715U, 2262364947U, 2227455964U, 2192742551U, 2158222529U, 2123893754U,
2089754119U, 2055801552U, 2022034013U, 1988449497U, 1955046031U, 1921821672U,
1888774511U, 1855902668U, 1823204291U, 1790677560U, 1758320682U, 1726131893U,
1694109454U, 1662251657U, 1630556815U, 1599023271U, 1567649391U, 1536433567U,
1505374214U, 1474469770U, 1443718700U, 1413119487U, 1382670639U, 1352370686U,
1322218179U, 1292211689U, 1262349810U, 1232631153U, 1203054352U, 1173618059U,
1144320946U, 1115161701U, 1086139034U, 1057251672U, 1028498358U, 999877854U,
971388940U, 943030410U, 914801076U, 886699767U, 858725327U, 830876614U,
803152505U, 775551890U, 748073672U, 720716771U, 693480120U, 666362667U,
639363374U, 612481215U, 585715177U, 559064263U, 532527486U, 506103872U,
479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U,
324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U,
172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U,
24347096U, 0U
#if 0
65166, 64430, 63700, 62976, 62257, 61543, 60835, 60132, 59434, 58741, 58054,
57371, 56693, 56020, 55352, 54689, 54030, 53375, 52726, 52080, 51439, 50803,
50170, 49542, 48918, 48298, 47682, 47070, 46462, 45858, 45257, 44661, 44068,
43479, 42894, 42312, 41733, 41159, 40587, 40020, 39455, 38894, 38336, 37782,
37230, 36682, 36137, 35595, 35057, 34521, 33988, 33459, 32932, 32408, 31887,
31369, 30854, 30341, 29832, 29325, 28820, 28319, 27820, 27324, 26830, 26339,
25850, 25364, 24880, 24399, 23920, 23444, 22970, 22499, 22029, 21562, 21098,
20636, 20175, 19718, 19262, 18808, 18357, 17908, 17461, 17016, 16573, 16132,
15694, 15257, 14822, 14390, 13959, 13530, 13103, 12678, 12255, 11834, 11415,
10997, 10582, 10168, 9756, 9346, 8937, 8531, 8126, 7723, 7321, 6921, 6523,
6127, 5732, 5339, 4947, 4557, 4169, 3782, 3397, 3014, 2632, 2251, 1872, 1495,
1119, 744, 372
#endif
};
static png_int_32
png_log8bit(unsigned int x)
{
unsigned int lg2 = 0;
if ((x &= 0xff) == 0)
return -1;
if ((x & 0xf0) == 0)
lg2 = 4, x <<= 4;
if ((x & 0xc0) == 0)
lg2 += 2, x <<= 2;
if ((x & 0x80) == 0)
lg2 += 1, x <<= 1;
return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16));
}
#ifdef PNG_16BIT_SUPPORTED
static png_int_32
png_log16bit(png_uint_32 x)
{
unsigned int lg2 = 0;
if ((x &= 0xffff) == 0)
return -1;
if ((x & 0xff00) == 0)
lg2 = 8, x <<= 8;
if ((x & 0xf000) == 0)
lg2 += 4, x <<= 4;
if ((x & 0xc000) == 0)
lg2 += 2, x <<= 2;
if ((x & 0x8000) == 0)
lg2 += 1, x <<= 1;
lg2 <<= 28;
lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4;
x = ((x << 16) + (x >> 9)) / (x >> 8);
x -= 1U << 24;
if (x <= 65536U)
lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12);
else
lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12);
return (png_int_32)((lg2 + 2048) >> 12);
}
#endif
static const png_uint_32
png_32bit_exp[16] =
{
4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U,
3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U,
2553802834U, 2445529972U, 2341847524U, 2242560872U
};
#if 0
for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"}
11 44937.64284865548751208448
10 45180.98734845585101160448
9 45303.31936980687359311872
8 45364.65110595323018870784
7 45395.35850361789624614912
6 45410.72259715102037508096
5 45418.40724413220722311168
4 45422.25021786898173001728
3 45424.17186732298419044352
2 45425.13273269940811464704
1 45425.61317555035558641664
0 45425.85339951654943850496
#endif
static png_uint_32
png_exp(png_fixed_point x)
{
if (x > 0 && x <= 0xfffff)
{
png_uint_32 e = png_32bit_exp[(x >> 12) & 0x0f];
if (x & 0x800)
e -= (((e >> 16) * 44938U) + 16U) >> 5;
if (x & 0x400)
e -= (((e >> 16) * 45181U) + 32U) >> 6;
if (x & 0x200)
e -= (((e >> 16) * 45303U) + 64U) >> 7;
if (x & 0x100)
e -= (((e >> 16) * 45365U) + 128U) >> 8;
if (x & 0x080)
e -= (((e >> 16) * 45395U) + 256U) >> 9;
if (x & 0x040)
e -= (((e >> 16) * 45410U) + 512U) >> 10;
e -= (((e >> 16) * 355U * (x & 0x3fU)) + 256U) >> 9;
e >>= x >> 16;
return e;
}
if (x <= 0)
return png_32bit_exp[0];
return 0;
}
static png_byte
png_exp8bit(png_fixed_point lg2)
{
png_uint_32 x = png_exp(lg2);
x -= x >> 8;
return (png_byte)(((x + 0x7fffffU) >> 24) & 0xff);
}
#ifdef PNG_16BIT_SUPPORTED
static png_uint_16
png_exp16bit(png_fixed_point lg2)
{
png_uint_32 x = png_exp(lg2);
x -= x >> 16;
return (png_uint_16)((x + 32767U) >> 16);
}
#endif
#endif
png_byte
png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val)
{
if (value > 0 && value < 255)
{
# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = floor(255*pow((int)value/255.,gamma_val*.00001)+.5);
return (png_byte)r;
# else
png_int_32 lg2 = png_log8bit(value);
png_fixed_point res;
if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1) != 0)
return png_exp8bit(res);
value = 0;
# endif
}
return (png_byte)(value & 0xff);
}
#ifdef PNG_16BIT_SUPPORTED
png_uint_16
png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val)
{
if (value > 0 && value < 65535)
{
# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = floor(65535*pow((png_int_32)value/65535.,
gamma_val*.00001)+.5);
return (png_uint_16)r;
# else
png_int_32 lg2 = png_log16bit(value);
png_fixed_point res;
if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1) != 0)
return png_exp16bit(res);
value = 0;
# endif
}
return (png_uint_16)value;
}
#endif
png_uint_16
png_gamma_correct(png_structrp png_ptr, unsigned int value,
png_fixed_point gamma_val)
{
if (png_ptr->bit_depth == 8)
return png_gamma_8bit_correct(value, gamma_val);
#ifdef PNG_16BIT_SUPPORTED
else
return png_gamma_16bit_correct(value, gamma_val);
#else
return 0;
#endif
}
#ifdef PNG_16BIT_SUPPORTED
static void
png_build_16bit_table(png_structrp png_ptr, png_uint_16pp *ptable,
PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
{
PNG_CONST unsigned int num = 1U << (8U - shift);
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
PNG_CONST double fmax = 1./(((png_int_32)1 << (16U - shift))-1);
#endif
PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
PNG_CONST unsigned int max_by_2 = 1U << (15U-shift);
unsigned int i;
png_uint_16pp table = *ptable =
(png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p)));
for (i = 0; i < num; i++)
{
png_uint_16p sub_table = table[i] =
(png_uint_16p)png_malloc(png_ptr, 256 * (sizeof (png_uint_16)));
if (png_gamma_significant(gamma_val) != 0)
{
unsigned int j;
for (j = 0; j < 256; j++)
{
png_uint_32 ig = (j << (8-shift)) + i;
# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double d = floor(65535.*pow(ig*fmax, gamma_val*.00001)+.5);
sub_table[j] = (png_uint_16)d;
# else
if (shift != 0)
ig = (ig * 65535U + max_by_2)/max;
sub_table[j] = png_gamma_16bit_correct(ig, gamma_val);
# endif
}
}
else
{
unsigned int j;
for (j = 0; j < 256; j++)
{
png_uint_32 ig = (j << (8-shift)) + i;
if (shift != 0)
ig = (ig * 65535U + max_by_2)/max;
sub_table[j] = (png_uint_16)ig;
}
}
}
}
static void
png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable,
PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
{
PNG_CONST unsigned int num = 1U << (8U - shift);
PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
unsigned int i;
png_uint_32 last;
png_uint_16pp table = *ptable =
(png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p)));
for (i = 0; i < num; i++)
table[i] = (png_uint_16p)png_malloc(png_ptr,
256 * (sizeof (png_uint_16)));
last = 0;
for (i = 0; i < 255; ++i)
{
png_uint_16 out = (png_uint_16)(i * 257U);
png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val);
bound = (bound * max + 32768U)/65535U + 1U;
while (last < bound)
{
table[last & (0xffU >> shift)][last >> (8U - shift)] = out;
last++;
}
}
while (last < (num << 8))
{
table[last & (0xff >> shift)][last >> (8U - shift)] = 65535U;
last++;
}
}
#endif
static void
png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable,
PNG_CONST png_fixed_point gamma_val)
{
unsigned int i;
png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256);
if (png_gamma_significant(gamma_val) != 0)
for (i=0; i<256; i++)
table[i] = png_gamma_8bit_correct(i, gamma_val);
else
for (i=0; i<256; ++i)
table[i] = (png_byte)(i & 0xff);
}
void
png_destroy_gamma_table(png_structrp png_ptr)
{
png_free(png_ptr, png_ptr->gamma_table);
png_ptr->gamma_table = NULL;
#ifdef PNG_16BIT_SUPPORTED
if (png_ptr->gamma_16_table != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_table[i]);
}
png_free(png_ptr, png_ptr->gamma_16_table);
png_ptr->gamma_16_table = NULL;
}
#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_free(png_ptr, png_ptr->gamma_from_1);
png_ptr->gamma_from_1 = NULL;
png_free(png_ptr, png_ptr->gamma_to_1);
png_ptr->gamma_to_1 = NULL;
#ifdef PNG_16BIT_SUPPORTED
if (png_ptr->gamma_16_from_1 != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
}
png_free(png_ptr, png_ptr->gamma_16_from_1);
png_ptr->gamma_16_from_1 = NULL;
}
if (png_ptr->gamma_16_to_1 != NULL)
{
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
}
png_free(png_ptr, png_ptr->gamma_16_to_1);
png_ptr->gamma_16_to_1 = NULL;
}
#endif
#endif
}
void
png_build_gamma_table(png_structrp png_ptr, int bit_depth)
{
png_debug(1, "in png_build_gamma_table");
if (png_ptr->gamma_table != NULL || png_ptr->gamma_16_table != NULL)
{
png_warning(png_ptr, "gamma table being rebuilt");
png_destroy_gamma_table(png_ptr);
}
if (bit_depth <= 8)
{
png_build_8bit_table(png_ptr, &png_ptr->gamma_table,
png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma,
png_ptr->screen_gamma) : PNG_FP_1);
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if ((png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) != 0)
{
png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1,
png_reciprocal(png_ptr->colorspace.gamma));
png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1,
png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) :
png_ptr->colorspace.gamma);
}
#endif
}
#ifdef PNG_16BIT_SUPPORTED
else
{
png_byte shift, sig_bit;
if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
sig_bit = png_ptr->sig_bit.red;
if (png_ptr->sig_bit.green > sig_bit)
sig_bit = png_ptr->sig_bit.green;
if (png_ptr->sig_bit.blue > sig_bit)
sig_bit = png_ptr->sig_bit.blue;
}
else
sig_bit = png_ptr->sig_bit.gray;
if (sig_bit > 0 && sig_bit < 16U)
shift = (png_byte)((16U - sig_bit) & 0xff);
else
shift = 0;
if ((png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) != 0)
{
if (shift < (16U - PNG_MAX_GAMMA_8))
shift = (16U - PNG_MAX_GAMMA_8);
}
if (shift > 8U)
shift = 8U;
png_ptr->gamma_shift = shift;
if ((png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) != 0)
png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift,
png_ptr->screen_gamma > 0 ? png_product2(png_ptr->colorspace.gamma,
png_ptr->screen_gamma) : PNG_FP_1);
else
png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift,
png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma,
png_ptr->screen_gamma) : PNG_FP_1);
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if ((png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) != 0)
{
png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift,
png_reciprocal(png_ptr->colorspace.gamma));
png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift,
png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) :
png_ptr->colorspace.gamma);
}
#endif
}
#endif
}
#endif
#ifdef PNG_SET_OPTION_SUPPORTED
int PNGAPI
png_set_option(png_structrp png_ptr, int option, int onoff)
{
if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT &&
(option & 1) == 0)
{
int mask = 3 << option;
int setting = (2 + (onoff != 0)) << option;
int current = png_ptr->options;
png_ptr->options = (png_byte)(((current & ~mask) | setting) & 0xff);
return (current & mask) >> option;
}
return PNG_OPTION_INVALID;
}
#endif
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
const png_uint_16 png_sRGB_table[256] =
{
0,20,40,60,80,99,119,139,
159,179,199,219,241,264,288,313,
340,367,396,427,458,491,526,562,
599,637,677,718,761,805,851,898,
947,997,1048,1101,1156,1212,1270,1330,
1391,1453,1517,1583,1651,1720,1790,1863,
1937,2013,2090,2170,2250,2333,2418,2504,
2592,2681,2773,2866,2961,3058,3157,3258,
3360,3464,3570,3678,3788,3900,4014,4129,
4247,4366,4488,4611,4736,4864,4993,5124,
5257,5392,5530,5669,5810,5953,6099,6246,
6395,6547,6700,6856,7014,7174,7335,7500,
7666,7834,8004,8177,8352,8528,8708,8889,
9072,9258,9445,9635,9828,10022,10219,10417,
10619,10822,11028,11235,11446,11658,11873,12090,
12309,12530,12754,12980,13209,13440,13673,13909,
14146,14387,14629,14874,15122,15371,15623,15878,
16135,16394,16656,16920,17187,17456,17727,18001,
18277,18556,18837,19121,19407,19696,19987,20281,
20577,20876,21177,21481,21787,22096,22407,22721,
23038,23357,23678,24002,24329,24658,24990,25325,
25662,26001,26344,26688,27036,27386,27739,28094,
28452,28813,29176,29542,29911,30282,30656,31033,
31412,31794,32179,32567,32957,33350,33745,34143,
34544,34948,35355,35764,36176,36591,37008,37429,
37852,38278,38706,39138,39572,40009,40449,40891,
41337,41785,42236,42690,43147,43606,44069,44534,
45002,45473,45947,46423,46903,47385,47871,48359,
48850,49344,49841,50341,50844,51349,51858,52369,
52884,53401,53921,54445,54971,55500,56032,56567,
57105,57646,58190,58737,59287,59840,60396,60955,
61517,62082,62650,63221,63795,64372,64952,65535
};
#endif
const png_uint_16 png_sRGB_base[512] =
{
128,1782,3383,4644,5675,6564,7357,8074,
8732,9346,9921,10463,10977,11466,11935,12384,
12816,13233,13634,14024,14402,14769,15125,15473,
15812,16142,16466,16781,17090,17393,17690,17981,
18266,18546,18822,19093,19359,19621,19879,20133,
20383,20630,20873,21113,21349,21583,21813,22041,
22265,22487,22707,22923,23138,23350,23559,23767,
23972,24175,24376,24575,24772,24967,25160,25352,
25542,25730,25916,26101,26284,26465,26645,26823,
27000,27176,27350,27523,27695,27865,28034,28201,
28368,28533,28697,28860,29021,29182,29341,29500,
29657,29813,29969,30123,30276,30429,30580,30730,
30880,31028,31176,31323,31469,31614,31758,31902,
32045,32186,32327,32468,32607,32746,32884,33021,
33158,33294,33429,33564,33697,33831,33963,34095,
34226,34357,34486,34616,34744,34873,35000,35127,
35253,35379,35504,35629,35753,35876,35999,36122,
36244,36365,36486,36606,36726,36845,36964,37083,
37201,37318,37435,37551,37668,37783,37898,38013,
38127,38241,38354,38467,38580,38692,38803,38915,
39026,39136,39246,39356,39465,39574,39682,39790,
39898,40005,40112,40219,40325,40431,40537,40642,
40747,40851,40955,41059,41163,41266,41369,41471,
41573,41675,41777,41878,41979,42079,42179,42279,
42379,42478,42577,42676,42775,42873,42971,43068,
43165,43262,43359,43456,43552,43648,43743,43839,
43934,44028,44123,44217,44311,44405,44499,44592,
44685,44778,44870,44962,45054,45146,45238,45329,
45420,45511,45601,45692,45782,45872,45961,46051,
46140,46229,46318,46406,46494,46583,46670,46758,
46846,46933,47020,47107,47193,47280,47366,47452,
47538,47623,47709,47794,47879,47964,48048,48133,
48217,48301,48385,48468,48552,48635,48718,48801,
48884,48966,49048,49131,49213,49294,49376,49458,
49539,49620,49701,49782,49862,49943,50023,50103,
50183,50263,50342,50422,50501,50580,50659,50738,
50816,50895,50973,51051,51129,51207,51285,51362,
51439,51517,51594,51671,51747,51824,51900,51977,
52053,52129,52205,52280,52356,52432,52507,52582,
52657,52732,52807,52881,52956,53030,53104,53178,
53252,53326,53400,53473,53546,53620,53693,53766,
53839,53911,53984,54056,54129,54201,54273,54345,
54417,54489,54560,54632,54703,54774,54845,54916,
54987,55058,55129,55199,55269,55340,55410,55480,
55550,55620,55689,55759,55828,55898,55967,56036,
56105,56174,56243,56311,56380,56448,56517,56585,
56653,56721,56789,56857,56924,56992,57059,57127,
57194,57261,57328,57395,57462,57529,57595,57662,
57728,57795,57861,57927,57993,58059,58125,58191,
58256,58322,58387,58453,58518,58583,58648,58713,
58778,58843,58908,58972,59037,59101,59165,59230,
59294,59358,59422,59486,59549,59613,59677,59740,
59804,59867,59930,59993,60056,60119,60182,60245,
60308,60370,60433,60495,60558,60620,60682,60744,
60806,60868,60930,60992,61054,61115,61177,61238,
61300,61361,61422,61483,61544,61605,61666,61727,
61788,61848,61909,61969,62030,62090,62150,62211,
62271,62331,62391,62450,62510,62570,62630,62689,
62749,62808,62867,62927,62986,63045,63104,63163,
63222,63281,63340,63398,63457,63515,63574,63632,
63691,63749,63807,63865,63923,63981,64039,64097,
64155,64212,64270,64328,64385,64443,64500,64557,
64614,64672,64729,64786,64843,64900,64956,65013,
65070,65126,65183,65239,65296,65352,65409,65465
};
const png_byte png_sRGB_delta[512] =
{
207,201,158,129,113,100,90,82,77,72,68,64,61,59,56,54,
52,50,49,47,46,45,43,42,41,40,39,39,38,37,36,36,
35,34,34,33,33,32,32,31,31,30,30,30,29,29,28,28,
28,27,27,27,27,26,26,26,25,25,25,25,24,24,24,24,
23,23,23,23,23,22,22,22,22,22,22,21,21,21,21,21,
21,20,20,20,20,20,20,20,20,19,19,19,19,19,19,19,
19,18,18,18,18,18,18,18,18,18,18,17,17,17,17,17,
17,17,17,17,17,17,16,16,16,16,16,16,16,16,16,16,
16,16,16,16,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,14,14,14,14,14,14,14,14,14,14,14,14,
14,14,14,14,14,14,14,13,13,13,13,13,13,13,13,13,
13,13,13,13,13,13,13,13,13,13,13,13,13,13,12,12,
12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
12,12,12,12,12,12,12,12,12,12,12,12,11,11,11,11,
11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
11,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};
#endif
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
static int
png_image_free_function(png_voidp argument)
{
png_imagep image = png_voidcast(png_imagep, argument);
png_controlp cp = image->opaque;
png_control c;
if (cp->png_ptr == NULL)
return 0;
# ifdef PNG_STDIO_SUPPORTED
if (cp->owned_file != 0)
{
FILE *fp = png_voidcast(FILE*, cp->png_ptr->io_ptr);
cp->owned_file = 0;
if (fp != NULL)
{
cp->png_ptr->io_ptr = NULL;
(void)fclose(fp);
}
}
# endif
c = *cp;
image->opaque = &c;
png_free(c.png_ptr, cp);
if (c.for_write != 0)
{
# ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
png_destroy_write_struct(&c.png_ptr, &c.info_ptr);
# else
png_error(c.png_ptr, "simplified write not supported");
# endif
}
else
{
# ifdef PNG_SIMPLIFIED_READ_SUPPORTED
png_destroy_read_struct(&c.png_ptr, &c.info_ptr, NULL);
# else
png_error(c.png_ptr, "simplified read not supported");
# endif
}
return 1;
}
void PNGAPI
png_image_free(png_imagep image)
{
if (image != NULL && image->opaque != NULL &&
image->opaque->error_buf == NULL)
{
(void)png_safe_execute(image, png_image_free_function, image);
image->opaque = NULL;
}
}
int
png_image_error(png_imagep image, png_const_charp error_message)
{
png_safecat(image->message, (sizeof image->message), 0, error_message);
image->warning_or_error |= PNG_IMAGE_ERROR;
png_image_free(image);
return 0;
}
#endif
#endif