mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-30 13:45:27 +00:00
4056145565
--HG-- rename : modules/libimg/png/CHANGES => media/libpng/CHANGES rename : modules/libimg/png/LICENSE => media/libpng/LICENSE rename : modules/libimg/png/MOZCHANGES => media/libpng/MOZCHANGES rename : modules/libimg/png/Makefile.in => media/libpng/Makefile.in rename : modules/libimg/png/README => media/libpng/README rename : modules/libimg/png/crashtests/374810-1.html => media/libpng/crashtests/374810-1.html rename : modules/libimg/png/crashtests/crashtests.list => media/libpng/crashtests/crashtests.list rename : modules/libimg/png/libpng.txt => media/libpng/libpng.txt rename : modules/libimg/png/mozpngconf.h => media/libpng/mozpngconf.h rename : modules/libimg/png/png.c => media/libpng/png.c rename : modules/libimg/png/png.h => media/libpng/png.h rename : modules/libimg/png/pngconf.h => media/libpng/pngconf.h rename : modules/libimg/png/pngerror.c => media/libpng/pngerror.c rename : modules/libimg/png/pngget.c => media/libpng/pngget.c rename : modules/libimg/png/pngmem.c => media/libpng/pngmem.c rename : modules/libimg/png/pngpread.c => media/libpng/pngpread.c rename : modules/libimg/png/pngpriv.h => media/libpng/pngpriv.h rename : modules/libimg/png/pngread.c => media/libpng/pngread.c rename : modules/libimg/png/pngrio.c => media/libpng/pngrio.c rename : modules/libimg/png/pngrtran.c => media/libpng/pngrtran.c rename : modules/libimg/png/pngrutil.c => media/libpng/pngrutil.c rename : modules/libimg/png/pngset.c => media/libpng/pngset.c rename : modules/libimg/png/pngtrans.c => media/libpng/pngtrans.c rename : modules/libimg/png/pngwio.c => media/libpng/pngwio.c rename : modules/libimg/png/pngwrite.c => media/libpng/pngwrite.c rename : modules/libimg/png/pngwtran.c => media/libpng/pngwtran.c rename : modules/libimg/png/pngwutil.c => media/libpng/pngwutil.c
915 lines
26 KiB
C
915 lines
26 KiB
C
|
|
/* png.c - location for general purpose libpng functions
|
|
*
|
|
* Last changed in libpng 1.4.6 [March 8, 2011]
|
|
* Copyright (c) 1998-2011 Glenn Randers-Pehrson
|
|
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
|
|
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*/
|
|
|
|
#define PNG_NO_EXTERN
|
|
#define PNG_NO_PEDANTIC_WARNINGS
|
|
#include "png.h"
|
|
#include "pngpriv.h"
|
|
|
|
/* Generate a compiler error if there is an old png.h in the search path. */
|
|
typedef version_1_4_8 Your_png_h_is_not_version_1_4_8;
|
|
|
|
/* Tells libpng that we have already handled the first "num_bytes" bytes
|
|
* of the PNG file signature. If the PNG data is embedded into another
|
|
* stream we can set num_bytes = 8 so that libpng will not attempt to read
|
|
* or write any of the magic bytes before it starts on the IHDR.
|
|
*/
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
void PNGAPI
|
|
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
|
|
{
|
|
png_debug(1, "in png_set_sig_bytes");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
if (num_bytes > 8)
|
|
png_error(png_ptr, "Too many bytes for PNG signature");
|
|
|
|
png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
|
|
}
|
|
|
|
/* Checks whether the supplied bytes match the PNG signature. We allow
|
|
* checking less than the full 8-byte signature so that those apps that
|
|
* already read the first few bytes of a file to determine the file type
|
|
* can simply check the remaining bytes for extra assurance. Returns
|
|
* an integer less than, equal to, or greater than zero if sig is found,
|
|
* respectively, to be less than, to match, or be greater than the correct
|
|
* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
|
|
*/
|
|
int PNGAPI
|
|
png_sig_cmp(png_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)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
|
|
}
|
|
|
|
#endif /* PNG_READ_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
|
|
/* Function to allocate memory for zlib and clear it to 0. */
|
|
voidpf /* PRIVATE */
|
|
png_zalloc(voidpf png_ptr, uInt items, uInt size)
|
|
{
|
|
png_voidp ptr;
|
|
png_structp p=(png_structp)png_ptr;
|
|
png_uint_32 save_flags=p->flags;
|
|
png_alloc_size_t num_bytes;
|
|
|
|
if (png_ptr == NULL)
|
|
return (NULL);
|
|
if (items > PNG_UINT_32_MAX/size)
|
|
{
|
|
png_warning (p, "Potential overflow in png_zalloc()");
|
|
return (NULL);
|
|
}
|
|
num_bytes = (png_alloc_size_t)items * size;
|
|
|
|
p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
|
|
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
|
|
p->flags=save_flags;
|
|
|
|
return ((voidpf)ptr);
|
|
}
|
|
|
|
/* Function to free memory for zlib */
|
|
void /* PRIVATE */
|
|
png_zfree(voidpf png_ptr, voidpf ptr)
|
|
{
|
|
png_free((png_structp)png_ptr, (png_voidp)ptr);
|
|
}
|
|
|
|
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
|
|
* in case CRC is > 32 bits to leave the top bits 0.
|
|
*/
|
|
void /* PRIVATE */
|
|
png_reset_crc(png_structp png_ptr)
|
|
{
|
|
png_ptr->crc = crc32(0, Z_NULL, 0);
|
|
}
|
|
|
|
/* Calculate the CRC over a section of data. We can only pass as
|
|
* much data to this routine as the largest single buffer size. We
|
|
* also check that this data will actually be used before going to the
|
|
* trouble of calculating it.
|
|
*/
|
|
void /* PRIVATE */
|
|
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
|
|
{
|
|
int need_crc = 1;
|
|
|
|
if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
|
|
{
|
|
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
|
|
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
|
|
need_crc = 0;
|
|
}
|
|
else /* critical */
|
|
{
|
|
if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
|
|
need_crc = 0;
|
|
}
|
|
|
|
if (need_crc)
|
|
png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
|
|
}
|
|
|
|
/* Allocate the memory for an info_struct for the application. We don't
|
|
* really need the png_ptr, but it could potentially be useful in the
|
|
* future. This should be used in favour of malloc(png_sizeof(png_info))
|
|
* and png_info_init() so that applications that want to use a shared
|
|
* libpng don't have to be recompiled if png_info changes size.
|
|
*/
|
|
png_infop PNGAPI
|
|
png_create_info_struct(png_structp png_ptr)
|
|
{
|
|
png_infop info_ptr;
|
|
|
|
png_debug(1, "in png_create_info_struct");
|
|
|
|
if (png_ptr == NULL)
|
|
return (NULL);
|
|
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
|
|
png_ptr->malloc_fn, png_ptr->mem_ptr);
|
|
#else
|
|
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
|
|
#endif
|
|
if (info_ptr != NULL)
|
|
png_info_init_3(&info_ptr, png_sizeof(png_info));
|
|
|
|
return (info_ptr);
|
|
}
|
|
|
|
/* This function frees the memory associated with a single info struct.
|
|
* Normally, one would use either png_destroy_read_struct() or
|
|
* png_destroy_write_struct() to free an info struct, but this may be
|
|
* useful for some applications.
|
|
*/
|
|
void PNGAPI
|
|
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
|
|
{
|
|
png_infop 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)
|
|
{
|
|
png_info_destroy(png_ptr, info_ptr);
|
|
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
|
|
png_ptr->mem_ptr);
|
|
#else
|
|
png_destroy_struct((png_voidp)info_ptr);
|
|
#endif
|
|
*info_ptr_ptr = NULL;
|
|
}
|
|
}
|
|
|
|
/* Initialize the info structure. This is now an internal function (0.89)
|
|
* and applications using it are urged to use png_create_info_struct()
|
|
* instead.
|
|
*/
|
|
|
|
void PNGAPI
|
|
png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
|
|
{
|
|
png_infop info_ptr = *ptr_ptr;
|
|
|
|
png_debug(1, "in png_info_init_3");
|
|
|
|
if (info_ptr == NULL)
|
|
return;
|
|
|
|
if (png_sizeof(png_info) > png_info_struct_size)
|
|
{
|
|
png_destroy_struct(info_ptr);
|
|
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
|
|
*ptr_ptr = info_ptr;
|
|
}
|
|
|
|
/* Set everything to 0 */
|
|
png_memset(info_ptr, 0, png_sizeof(png_info));
|
|
}
|
|
|
|
void PNGAPI
|
|
png_data_freer(png_structp png_ptr, png_infop 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_warning(png_ptr,
|
|
"Unknown freer parameter in png_data_freer");
|
|
}
|
|
|
|
void PNGAPI
|
|
png_free_data(png_structp png_ptr, png_infop 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
|
|
/* Free text item num or (if num == -1) all text items */
|
|
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
|
|
{
|
|
if (num != -1)
|
|
{
|
|
if (info_ptr->text && info_ptr->text[num].key)
|
|
{
|
|
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_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
|
|
png_free(png_ptr, info_ptr->text);
|
|
info_ptr->text = NULL;
|
|
info_ptr->num_text=0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_tRNS_SUPPORTED
|
|
/* Free any tRNS entry */
|
|
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
|
|
{
|
|
png_free(png_ptr, info_ptr->trans_alpha);
|
|
info_ptr->trans_alpha = NULL;
|
|
info_ptr->valid &= ~PNG_INFO_tRNS;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_sCAL_SUPPORTED
|
|
/* Free any sCAL entry */
|
|
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
|
|
{
|
|
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
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;
|
|
#endif
|
|
info_ptr->valid &= ~PNG_INFO_sCAL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_pCAL_SUPPORTED
|
|
/* Free any pCAL entry */
|
|
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
|
|
{
|
|
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 < (int)info_ptr->pcal_nparams; i++)
|
|
{
|
|
png_free(png_ptr, info_ptr->pcal_params[i]);
|
|
info_ptr->pcal_params[i] = NULL;
|
|
}
|
|
png_free(png_ptr, info_ptr->pcal_params);
|
|
info_ptr->pcal_params = NULL;
|
|
}
|
|
info_ptr->valid &= ~PNG_INFO_pCAL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_iCCP_SUPPORTED
|
|
/* Free any iCCP entry */
|
|
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
|
|
{
|
|
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
|
|
/* Free a given sPLT entry, or (if num == -1) all sPLT entries */
|
|
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
|
|
{
|
|
if (num != -1)
|
|
{
|
|
if (info_ptr->splt_palettes)
|
|
{
|
|
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
|
|
{
|
|
if (info_ptr->splt_palettes_num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
|
|
|
|
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_UNKNOWN_CHUNKS_SUPPORTED
|
|
if (png_ptr->unknown_chunk.data)
|
|
{
|
|
png_free(png_ptr, png_ptr->unknown_chunk.data);
|
|
png_ptr->unknown_chunk.data = NULL;
|
|
}
|
|
|
|
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
|
|
{
|
|
if (num != -1)
|
|
{
|
|
if (info_ptr->unknown_chunks)
|
|
{
|
|
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
|
|
info_ptr->unknown_chunks[num].data = NULL;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
|
|
if (info_ptr->unknown_chunks_num)
|
|
{
|
|
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
|
|
|
|
png_free(png_ptr, info_ptr->unknown_chunks);
|
|
info_ptr->unknown_chunks = NULL;
|
|
info_ptr->unknown_chunks_num = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_hIST_SUPPORTED
|
|
/* Free any hIST entry */
|
|
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
|
|
{
|
|
png_free(png_ptr, info_ptr->hist);
|
|
info_ptr->hist = NULL;
|
|
info_ptr->valid &= ~PNG_INFO_hIST;
|
|
}
|
|
#endif
|
|
|
|
/* Free any PLTE entry that was internally allocated */
|
|
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
|
|
{
|
|
png_zfree(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
|
|
/* Free any image bits attached to the info structure */
|
|
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
|
|
{
|
|
if (info_ptr->row_pointers)
|
|
{
|
|
int row;
|
|
for (row = 0; row < (int)info_ptr->height; row++)
|
|
{
|
|
png_free(png_ptr, info_ptr->row_pointers[row]);
|
|
info_ptr->row_pointers[row] = NULL;
|
|
}
|
|
png_free(png_ptr, info_ptr->row_pointers);
|
|
info_ptr->row_pointers = NULL;
|
|
}
|
|
info_ptr->valid &= ~PNG_INFO_IDAT;
|
|
}
|
|
#endif
|
|
|
|
if (num == -1)
|
|
info_ptr->free_me &= ~mask;
|
|
else
|
|
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
|
|
}
|
|
|
|
/* This is an internal routine to free any memory that the info struct is
|
|
* pointing to before re-using it or freeing the struct itself. Recall
|
|
* that png_free() checks for NULL pointers for us.
|
|
*/
|
|
void /* PRIVATE */
|
|
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
|
|
{
|
|
png_debug(1, "in png_info_destroy");
|
|
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
|
|
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
if (png_ptr->num_chunk_list)
|
|
{
|
|
png_free(png_ptr, png_ptr->chunk_list);
|
|
png_ptr->chunk_list = NULL;
|
|
png_ptr->num_chunk_list = 0;
|
|
}
|
|
#endif
|
|
|
|
png_info_init_3(&info_ptr, png_sizeof(png_info));
|
|
}
|
|
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
|
|
|
|
/* This function returns a pointer to the io_ptr associated with the user
|
|
* functions. The application should free any memory associated with this
|
|
* pointer before png_write_destroy() or png_read_destroy() are called.
|
|
*/
|
|
png_voidp PNGAPI
|
|
png_get_io_ptr(png_structp 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
|
|
/* Initialize the default input/output functions for the PNG file. If you
|
|
* use your own read or write routines, you can call either png_set_read_fn()
|
|
* or png_set_write_fn() instead of png_init_io(). If you have defined
|
|
* PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
|
|
* necessarily available.
|
|
*/
|
|
void PNGAPI
|
|
png_init_io(png_structp 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_TIME_RFC1123_SUPPORTED
|
|
/* Convert the supplied time into an RFC 1123 string suitable for use in
|
|
* a "Creation Time" or other text-based time string.
|
|
*/
|
|
png_charp PNGAPI
|
|
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
|
|
{
|
|
static PNG_CONST char short_months[12][4] =
|
|
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
|
|
|
|
if (png_ptr == NULL)
|
|
return (NULL);
|
|
if (png_ptr->time_buffer == NULL)
|
|
{
|
|
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
|
|
png_sizeof(char)));
|
|
}
|
|
|
|
#ifdef USE_FAR_KEYWORD
|
|
{
|
|
char near_time_buf[29];
|
|
png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
|
|
ptime->day % 32, short_months[(ptime->month - 1) % 12],
|
|
ptime->year, ptime->hour % 24, ptime->minute % 60,
|
|
ptime->second % 61);
|
|
png_memcpy(png_ptr->time_buffer, near_time_buf,
|
|
29*png_sizeof(char));
|
|
}
|
|
#else
|
|
png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
|
|
ptime->day % 32, short_months[(ptime->month - 1) % 12],
|
|
ptime->year, ptime->hour % 24, ptime->minute % 60,
|
|
ptime->second % 61);
|
|
#endif
|
|
return ((png_charp)png_ptr->time_buffer);
|
|
}
|
|
#endif /* PNG_TIME_RFC1123_SUPPORTED */
|
|
|
|
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
|
|
|
|
png_charp PNGAPI
|
|
png_get_copyright(png_const_structp png_ptr)
|
|
{
|
|
PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */
|
|
#ifdef PNG_STRING_COPYRIGHT
|
|
return PNG_STRING_COPYRIGHT
|
|
#else
|
|
#ifdef __STDC__
|
|
return ((png_charp) PNG_STRING_NEWLINE \
|
|
"libpng version 1.4.8 - July 7, 2011" PNG_STRING_NEWLINE \
|
|
"Copyright (c) 1998-2010 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 ((png_charp) "libpng version 1.4.8 - July 7, 2011\
|
|
Copyright (c) 1998-2010 Glenn Randers-Pehrson\
|
|
Copyright (c) 1996-1997 Andreas Dilger\
|
|
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
/* The following return the library version as a short string in the
|
|
* format 1.0.0 through 99.99.99zz. To get the version of *.h files
|
|
* used with your application, print out PNG_LIBPNG_VER_STRING, which
|
|
* is defined in png.h.
|
|
* Note: now there is no difference between png_get_libpng_ver() and
|
|
* png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
|
|
* it is guaranteed that png.c uses the correct version of png.h.
|
|
*/
|
|
png_charp PNGAPI
|
|
png_get_libpng_ver(png_const_structp png_ptr)
|
|
{
|
|
/* Version of *.c files used when building libpng */
|
|
PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */
|
|
return ((png_charp) PNG_LIBPNG_VER_STRING);
|
|
}
|
|
|
|
png_charp PNGAPI
|
|
png_get_header_ver(png_const_structp png_ptr)
|
|
{
|
|
/* Version of *.h files used when building libpng */
|
|
PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */
|
|
return ((png_charp) PNG_LIBPNG_VER_STRING);
|
|
}
|
|
|
|
png_charp PNGAPI
|
|
png_get_header_version(png_const_structp png_ptr)
|
|
{
|
|
/* Returns longer string containing both version and date */
|
|
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
|
|
#ifdef __STDC__
|
|
return ((png_charp) PNG_HEADER_VERSION_STRING
|
|
#ifndef PNG_READ_SUPPORTED
|
|
" (NO READ SUPPORT)"
|
|
#endif
|
|
PNG_STRING_NEWLINE);
|
|
#else
|
|
return ((png_charp) PNG_HEADER_VERSION_STRING);
|
|
#endif
|
|
}
|
|
|
|
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
int PNGAPI
|
|
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
|
|
{
|
|
/* Check chunk_name and return "keep" value if it's on the list, else 0 */
|
|
int i;
|
|
png_bytep p;
|
|
if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
|
|
return 0;
|
|
p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
|
|
for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
|
|
if (!png_memcmp(chunk_name, p, 4))
|
|
return ((int)*(p + 4));
|
|
return 0;
|
|
}
|
|
#endif
|
|
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
/* This function, added to libpng-1.0.6g, is untested. */
|
|
int PNGAPI
|
|
png_reset_zstream(png_structp png_ptr)
|
|
{
|
|
if (png_ptr == NULL)
|
|
return Z_STREAM_ERROR;
|
|
return (inflateReset(&png_ptr->zstream));
|
|
}
|
|
#endif /* PNG_READ_SUPPORTED */
|
|
|
|
/* This function was added to libpng-1.0.7 */
|
|
png_uint_32 PNGAPI
|
|
png_access_version_number(void)
|
|
{
|
|
/* Version of *.c files used when building libpng */
|
|
return((png_uint_32) PNG_LIBPNG_VER);
|
|
}
|
|
|
|
|
|
|
|
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
|
|
#ifdef PNG_SIZE_T
|
|
/* Added at libpng version 1.2.6 */
|
|
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
|
|
png_size_t PNGAPI
|
|
png_convert_size(size_t size)
|
|
{
|
|
if (size > (png_size_t)-1)
|
|
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
|
|
return ((png_size_t)size);
|
|
}
|
|
#endif /* PNG_SIZE_T */
|
|
|
|
/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
|
|
#ifdef PNG_cHRM_SUPPORTED
|
|
#ifdef PNG_CHECK_cHRM_SUPPORTED
|
|
|
|
/*
|
|
* Multiply two 32-bit numbers, V1 and V2, using 32-bit
|
|
* arithmetic, to produce a 64 bit result in the HI/LO words.
|
|
*
|
|
* A B
|
|
* x C D
|
|
* ------
|
|
* AD || BD
|
|
* AC || CB || 0
|
|
*
|
|
* where A and B are the high and low 16-bit words of V1,
|
|
* C and D are the 16-bit words of V2, AD is the product of
|
|
* A and D, and X || Y is (X << 16) + Y.
|
|
*/
|
|
|
|
void /* PRIVATE */
|
|
png_64bit_product(long v1, long v2, unsigned long *hi_product,
|
|
unsigned long *lo_product)
|
|
{
|
|
int a, b, c, d;
|
|
long lo, hi, x, y;
|
|
|
|
a = (v1 >> 16) & 0xffff;
|
|
b = v1 & 0xffff;
|
|
c = (v2 >> 16) & 0xffff;
|
|
d = v2 & 0xffff;
|
|
|
|
lo = b * d; /* BD */
|
|
x = a * d + c * b; /* AD + CB */
|
|
y = ((lo >> 16) & 0xffff) + x;
|
|
|
|
lo = (lo & 0xffff) | ((y & 0xffff) << 16);
|
|
hi = (y >> 16) & 0xffff;
|
|
|
|
hi += a * c; /* AC */
|
|
|
|
*hi_product = (unsigned long)hi;
|
|
*lo_product = (unsigned long)lo;
|
|
}
|
|
|
|
int /* PRIVATE */
|
|
png_check_cHRM_fixed(png_structp png_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)
|
|
{
|
|
int ret = 1;
|
|
unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
|
|
|
|
png_debug(1, "in function png_check_cHRM_fixed");
|
|
|
|
if (png_ptr == NULL)
|
|
return 0;
|
|
|
|
if (white_x < 0 || white_y <= 0 ||
|
|
red_x < 0 || red_y < 0 ||
|
|
green_x < 0 || green_y < 0 ||
|
|
blue_x < 0 || blue_y < 0)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Ignoring attempt to set negative chromaticity value");
|
|
ret = 0;
|
|
}
|
|
if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
white_y > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
red_x > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
red_y > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
green_x > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
green_y > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
|
|
blue_y > (png_fixed_point) PNG_UINT_31_MAX )
|
|
{
|
|
png_warning(png_ptr,
|
|
"Ignoring attempt to set chromaticity value exceeding 21474.83");
|
|
ret = 0;
|
|
}
|
|
if (white_x > 100000L - white_y)
|
|
{
|
|
png_warning(png_ptr, "Invalid cHRM white point");
|
|
ret = 0;
|
|
}
|
|
if (red_x > 100000L - red_y)
|
|
{
|
|
png_warning(png_ptr, "Invalid cHRM red point");
|
|
ret = 0;
|
|
}
|
|
if (green_x > 100000L - green_y)
|
|
{
|
|
png_warning(png_ptr, "Invalid cHRM green point");
|
|
ret = 0;
|
|
}
|
|
if (blue_x > 100000L - blue_y)
|
|
{
|
|
png_warning(png_ptr, "Invalid cHRM blue point");
|
|
ret = 0;
|
|
}
|
|
|
|
png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
|
|
png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
|
|
|
|
if (xy_hi == yx_hi && xy_lo == yx_lo)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Ignoring attempt to set cHRM RGB triangle with zero area");
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif /* PNG_CHECK_cHRM_SUPPORTED */
|
|
#endif /* PNG_cHRM_SUPPORTED */
|
|
|
|
void /* PRIVATE */
|
|
png_check_IHDR(png_structp 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;
|
|
|
|
/* Check for width and height valid values */
|
|
if (width == 0)
|
|
{
|
|
png_warning(png_ptr, "Image width is zero in IHDR");
|
|
error = 1;
|
|
}
|
|
|
|
if (height == 0)
|
|
{
|
|
png_warning(png_ptr, "Image height is zero in IHDR");
|
|
error = 1;
|
|
}
|
|
|
|
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX)
|
|
#else
|
|
if (width > PNG_USER_WIDTH_MAX)
|
|
#endif
|
|
{
|
|
png_warning(png_ptr, "Image width exceeds user limit in IHDR");
|
|
error = 1;
|
|
}
|
|
|
|
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
if (height > png_ptr->user_height_max || height > PNG_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 (width > PNG_UINT_31_MAX)
|
|
{
|
|
png_warning(png_ptr, "Invalid image width in IHDR");
|
|
error = 1;
|
|
}
|
|
|
|
if ( height > PNG_UINT_31_MAX)
|
|
{
|
|
png_warning(png_ptr, "Invalid image height in IHDR");
|
|
error = 1;
|
|
}
|
|
|
|
if ( width > (PNG_UINT_32_MAX
|
|
>> 3) /* 8-byte RGBA pixels */
|
|
- 64 /* bigrowbuf hack */
|
|
- 1 /* filter byte */
|
|
- 7*8 /* rounding of width to multiple of 8 pixels */
|
|
- 8) /* extra max_pixel_depth pad */
|
|
png_warning(png_ptr, "Width is too large for libpng to process pixels");
|
|
|
|
/* Check other values */
|
|
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
|
|
/* Accept filter_method 64 (intrapixel differencing) only if
|
|
* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
|
|
* 2. Libpng did not read a PNG signature (this filter_method is only
|
|
* used in PNG datastreams that are embedded in MNG datastreams) and
|
|
* 3. The application called png_permit_mng_features with a mask that
|
|
* included PNG_FLAG_MNG_FILTER_64 and
|
|
* 4. The filter_method is 64 and
|
|
* 5. The color_type is RGB or RGBA
|
|
*/
|
|
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) &&
|
|
png_ptr->mng_features_permitted)
|
|
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) &&
|
|
(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)
|
|
{
|
|
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");
|
|
}
|
|
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
|