700 lines
19 KiB
C
700 lines
19 KiB
C
|
|
/* png.c - location for general purpose libpng functions
|
|
*
|
|
* libpng version 1.0.9beta3 - November 23, 2000
|
|
* Copyright (c) 1998, 1999, 2000 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.)
|
|
*
|
|
*/
|
|
|
|
#define PNG_INTERNAL
|
|
#define PNG_NO_EXTERN
|
|
#include "png.h"
|
|
|
|
/* Generate a compiler error if there is an old png.h in the search path. */
|
|
typedef version_1_0_9beta3 Your_png_h_is_not_version_1_0_9beta3;
|
|
|
|
/* Version information for C files. This had better match the version
|
|
* string defined in png.h. */
|
|
|
|
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
/* png_libpng_ver was changed to a function in version 1.0.5c */
|
|
const char png_libpng_ver[18] = "1.0.9beta3";
|
|
|
|
/* png_sig was changed to a function in version 1.0.5c */
|
|
/* Place to hold the signature string for a PNG file. */
|
|
const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
|
|
|
|
/* Invoke global declarations for constant strings for known chunk types */
|
|
PNG_IHDR;
|
|
PNG_IDAT;
|
|
PNG_IEND;
|
|
PNG_PLTE;
|
|
PNG_bKGD;
|
|
PNG_cHRM;
|
|
PNG_gAMA;
|
|
PNG_hIST;
|
|
PNG_iCCP;
|
|
PNG_iTXt;
|
|
PNG_oFFs;
|
|
PNG_pCAL;
|
|
PNG_sCAL;
|
|
PNG_pHYs;
|
|
PNG_sBIT;
|
|
PNG_sPLT;
|
|
PNG_sRGB;
|
|
PNG_tEXt;
|
|
PNG_tIME;
|
|
PNG_tRNS;
|
|
PNG_zTXt;
|
|
|
|
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
|
|
|
|
/* start of interlace block */
|
|
const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
|
|
|
|
/* offset to next interlace block */
|
|
const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
|
|
|
|
/* start of interlace block in the y direction */
|
|
const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
|
|
|
|
/* offset to next interlace block in the y direction */
|
|
const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
|
|
|
|
/* width of interlace block (used in assembler routines only) */
|
|
#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
|
|
const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
|
|
#endif
|
|
|
|
/* Height of interlace block. This is not currently used - if you need
|
|
* it, uncomment it here and in png.h
|
|
const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
|
|
*/
|
|
|
|
/* Mask to determine which pixels are valid in a pass */
|
|
const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
|
|
|
|
/* Mask to determine which pixels to overwrite while displaying */
|
|
const int FARDATA png_pass_dsp_mask[]
|
|
= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
|
|
|
|
#endif
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
void PNGAPI
|
|
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
|
|
{
|
|
png_debug(1, "in png_set_sig_bytes\n");
|
|
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 (0);
|
|
|
|
if (start > 7)
|
|
return (0);
|
|
|
|
if (start + num_to_check > 8)
|
|
num_to_check = 8 - start;
|
|
|
|
return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
|
|
}
|
|
|
|
/* (Obsolete) function to check signature bytes. It does not allow one
|
|
* to check a partial signature. This function might be removed in the
|
|
* future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
|
|
*/
|
|
int PNGAPI
|
|
png_check_sig(png_bytep sig, int num)
|
|
{
|
|
return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
|
|
}
|
|
|
|
/* Function to allocate memory for zlib and clear it to 0. */
|
|
voidpf PNGAPI
|
|
png_zalloc(voidpf png_ptr, uInt items, uInt size)
|
|
{
|
|
png_uint_32 num_bytes = (png_uint_32)items * size;
|
|
png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
|
|
|
|
#ifndef PNG_NO_ZALLOC_ZERO
|
|
if (num_bytes > (png_uint_32)0x8000L)
|
|
{
|
|
png_memset(ptr, 0, (png_size_t)0x8000L);
|
|
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
|
|
(png_size_t)(num_bytes - (png_uint_32)0x8000L));
|
|
}
|
|
else
|
|
{
|
|
png_memset(ptr, 0, (png_size_t)num_bytes);
|
|
}
|
|
#endif
|
|
return ((voidpf)ptr);
|
|
}
|
|
|
|
/* function to free memory for zlib */
|
|
void PNGAPI
|
|
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(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\n");
|
|
if(png_ptr == NULL) return (NULL);
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
|
|
png_ptr->malloc_fn)) != NULL)
|
|
#else
|
|
if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
|
|
#endif
|
|
{
|
|
png_info_init(info_ptr);
|
|
}
|
|
|
|
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\n");
|
|
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);
|
|
#else
|
|
png_destroy_struct((png_voidp)info_ptr);
|
|
#endif
|
|
*info_ptr_ptr = (png_infop)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(png_infop info_ptr)
|
|
{
|
|
png_debug(1, "in png_info_init\n");
|
|
/* set everything to 0 */
|
|
png_memset(info_ptr, 0, sizeof (png_info));
|
|
}
|
|
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
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\n");
|
|
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.");
|
|
}
|
|
#endif
|
|
|
|
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\n");
|
|
if (png_ptr == NULL || info_ptr == NULL)
|
|
return;
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED)
|
|
/* free text item num or (if num == -1) all text items */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_TEXT)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED)
|
|
/* free any tRNS entry */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
|
|
#else
|
|
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
|
|
#endif
|
|
{
|
|
png_free(png_ptr, info_ptr->trans);
|
|
info_ptr->valid &= ~PNG_INFO_tRNS;
|
|
info_ptr->trans = NULL;
|
|
}
|
|
#endif
|
|
|
|
#if defined(PNG_sCAL_SUPPORTED)
|
|
/* free any sCAL entry */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_SCAL)
|
|
#endif
|
|
{
|
|
#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
|
|
|
|
#if defined(PNG_pCAL_SUPPORTED)
|
|
/* free any pCAL entry */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_PCAL)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#if defined(PNG_iCCP_SUPPORTED)
|
|
/* free any iCCP entry */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_ICCP)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#if defined(PNG_sPLT_SUPPORTED)
|
|
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_SPLT)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_UNKN)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#if defined(PNG_hIST_SUPPORTED)
|
|
/* free any hIST entry */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
|
|
#else
|
|
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
|
|
#endif
|
|
{
|
|
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 */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
|
|
#else
|
|
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
|
|
#endif
|
|
{
|
|
png_zfree(png_ptr, info_ptr->palette);
|
|
info_ptr->palette = NULL;
|
|
info_ptr->valid &= ~PNG_INFO_PLTE;
|
|
info_ptr->num_palette = 0;
|
|
}
|
|
|
|
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
/* free any image bits attached to the info structure */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
|
|
#else
|
|
if (mask & PNG_FREE_ROWS)
|
|
#endif
|
|
{
|
|
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
|
|
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
if(num == -1)
|
|
info_ptr->free_me &= ~mask;
|
|
else
|
|
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
|
|
#endif
|
|
}
|
|
|
|
/* 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\n");
|
|
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_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(info_ptr);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
return (png_ptr->io_ptr);
|
|
}
|
|
|
|
#if !defined(PNG_NO_STDIO)
|
|
/* 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\n");
|
|
png_ptr->io_ptr = (png_voidp)fp;
|
|
}
|
|
#endif
|
|
|
|
#if defined(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->time_buffer == NULL)
|
|
{
|
|
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
|
|
sizeof(char)));
|
|
}
|
|
|
|
#if defined(_WIN32_WCE)
|
|
{
|
|
wchar_t time_buf[29];
|
|
wsprintf(time_buf, TEXT("%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);
|
|
WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
|
|
NULL, NULL);
|
|
}
|
|
#else
|
|
#ifdef USE_FAR_KEYWORD
|
|
{
|
|
char near_time_buf[29];
|
|
sprintf(near_time_buf, "%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*sizeof(char));
|
|
}
|
|
#else
|
|
sprintf(png_ptr->time_buffer, "%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
|
|
#endif /* _WIN32_WCE */
|
|
return ((png_charp)png_ptr->time_buffer);
|
|
}
|
|
#endif /* PNG_TIME_RFC1123_SUPPORTED */
|
|
|
|
#if 0
|
|
/* Signature string for a PNG file. */
|
|
png_bytep PNGAPI
|
|
png_sig_bytes(void)
|
|
{
|
|
return ((png_bytep)"\211\120\116\107\015\012\032\012");
|
|
}
|
|
#endif
|
|
|
|
png_charp PNGAPI
|
|
png_get_copyright(png_structp png_ptr)
|
|
{
|
|
if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */
|
|
return ((png_charp) "\n libpng version 1.0.9beta3 - November 23, 2000\n\
|
|
Copyright (c) 1998-2000 Glenn Randers-Pehrson\n\
|
|
Copyright (c) 1996, 1997 Andreas Dilger\n\
|
|
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
|
|
return ((png_charp) "");
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
png_charp PNGAPI
|
|
png_get_libpng_ver(png_structp png_ptr)
|
|
{
|
|
/* Version of *.c files used when building libpng */
|
|
if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
|
|
return((png_charp) "1.0.9beta3");
|
|
return((png_charp) "1.0.9beta3");
|
|
}
|
|
|
|
png_charp PNGAPI
|
|
png_get_header_ver(png_structp png_ptr)
|
|
{
|
|
/* Version of *.h files used when building libpng */
|
|
if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
|
|
return((png_charp) PNG_LIBPNG_VER_STRING);
|
|
return((png_charp) PNG_LIBPNG_VER_STRING);
|
|
}
|
|
|
|
png_charp PNGAPI
|
|
png_get_header_version(png_structp png_ptr)
|
|
{
|
|
/* Returns longer string containing both version and date */
|
|
if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
|
|
return((png_charp) PNG_HEADER_VERSION_STRING);
|
|
return((png_charp) PNG_HEADER_VERSION_STRING);
|
|
}
|
|
|
|
#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
|
|
|
|
/* This function, added to libpng-1.0.6g, is untested. */
|
|
int PNGAPI
|
|
png_reset_zstream(png_structp png_ptr)
|
|
{
|
|
return (inflateReset(&png_ptr->zstream));
|
|
}
|
|
|
|
/* 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) 10009L);
|
|
}
|