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libpng/png.c

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1995-07-20 07:43:20 +00:00
1998-01-01 13:13:13 +00:00
/* png.c - location for general purpose libpng functions
*
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* Last changed in libpng 1.2.41 [October 18, 2009]
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (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
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*/
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#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include "png.h"
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/* Generate a compiler error if there is an old png.h in the search path. */
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typedef version_1_2_41beta06 Your_png_h_is_not_version_1_2_41beta06;
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/* Version information for C files. This had better match the version
* string defined in png.h.
*/
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#ifdef PNG_USE_GLOBAL_ARRAYS
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/* png_libpng_ver was changed to a function in version 1.0.5c */
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PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
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#ifdef PNG_READ_SUPPORTED
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/* png_sig was changed to a function in version 1.0.5c */
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/* Place to hold the signature string for a PNG file. */
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PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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#endif /* PNG_READ_SUPPORTED */
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/* 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;
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PNG_iCCP;
PNG_iTXt;
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PNG_oFFs;
PNG_pCAL;
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PNG_sCAL;
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PNG_pHYs;
PNG_sBIT;
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PNG_sPLT;
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PNG_sRGB;
PNG_tEXt;
PNG_tIME;
PNG_tRNS;
PNG_zTXt;
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#ifdef PNG_READ_SUPPORTED
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/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
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/* Start of interlace block */
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PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
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/* Offset to next interlace block */
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PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
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/* Start of interlace block in the y direction */
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PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
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/* Offset to next interlace block in the y direction */
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PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
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/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
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PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
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*/
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/* Mask to determine which pixels are valid in a pass */
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PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
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/* Mask to determine which pixels to overwrite while displaying */
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PNG_CONST int FARDATA png_pass_dsp_mask[]
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= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
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#endif /* PNG_READ_SUPPORTED */
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#endif /* PNG_USE_GLOBAL_ARRAYS */
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/* 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.
*/
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#ifdef PNG_READ_SUPPORTED
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void PNGAPI
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png_set_sig_bytes(png_structp png_ptr, int num_bytes)
{
png_debug(1, "in png_set_sig_bytes");
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if (png_ptr == NULL)
return;
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if (num_bytes > 8)
png_error(png_ptr, "Too many bytes for PNG signature.");
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png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
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}
/* 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).
*/
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int PNGAPI
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png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
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{
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png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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if (num_to_check > 8)
num_to_check = 8;
else if (num_to_check < 1)
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return (-1);
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if (start > 7)
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return (-1);
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if (start + num_to_check > 8)
num_to_check = 8 - start;
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return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
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}
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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/* (Obsolete) function to check signature bytes. It does not allow one
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* to check a partial signature. This function might be removed in the
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* future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG.
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*/
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int PNGAPI
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png_check_sig(png_bytep sig, int num)
{
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return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
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}
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#endif
#endif /* PNG_READ_SUPPORTED */
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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/* Function to allocate memory for zlib and clear it to 0. */
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#ifdef PNG_1_0_X
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voidpf PNGAPI
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#else
voidpf /* PRIVATE */
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#endif
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png_zalloc(voidpf png_ptr, uInt items, uInt size)
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{
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png_voidp ptr;
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png_structp p=(png_structp)png_ptr;
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png_uint_32 save_flags=p->flags;
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png_uint_32 num_bytes;
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if (png_ptr == NULL)
return (NULL);
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if (items > PNG_UINT_32_MAX/size)
{
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png_warning (p, "Potential overflow in png_zalloc()");
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return (NULL);
}
num_bytes = (png_uint_32)items * size;
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p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
p->flags=save_flags;
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#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
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if (ptr == NULL)
return ((voidpf)ptr);
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if (num_bytes > (png_uint_32)0x8000L)
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{
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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);
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}
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#endif
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return ((voidpf)ptr);
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}
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/* Function to free memory for zlib */
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#ifdef PNG_1_0_X
void PNGAPI
#else
void /* PRIVATE */
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#endif
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png_zfree(voidpf png_ptr, voidpf ptr)
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{
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png_free((png_structp)png_ptr, (png_voidp)ptr);
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}
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/* Reset the CRC variable to 32 bits of 1's. Care must be taken
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* in case CRC is > 32 bits to leave the top bits 0.
*/
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void /* PRIVATE */
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png_reset_crc(png_structp png_ptr)
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{
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png_ptr->crc = crc32(0, Z_NULL, 0);
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}
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/* Calculate the CRC over a section of data. We can only pass as
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* 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.
*/
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void /* PRIVATE */
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png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
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{
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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)
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png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
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}
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/* Allocate the memory for an info_struct for the application. We don't
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* really need the png_ptr, but it could potentially be useful in the
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* future. This should be used in favour of malloc(png_sizeof(png_info))
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* 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.
*/
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png_infop PNGAPI
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png_create_info_struct(png_structp png_ptr)
{
png_infop info_ptr;
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png_debug(1, "in png_create_info_struct");
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if (png_ptr == NULL)
return (NULL);
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#ifdef PNG_USER_MEM_SUPPORTED
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info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn, png_ptr->mem_ptr);
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#else
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info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
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#endif
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if (info_ptr != NULL)
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png_info_init_3(&info_ptr, png_sizeof(png_info));
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return (info_ptr);
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}
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/* This function frees the memory associated with a single info struct.
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* 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.
*/
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void PNGAPI
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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");
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if (png_ptr == NULL)
return;
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if (info_ptr_ptr != NULL)
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info_ptr = *info_ptr_ptr;
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if (info_ptr != NULL)
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{
png_info_destroy(png_ptr, info_ptr);
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
png_ptr->mem_ptr);
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#else
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png_destroy_struct((png_voidp)info_ptr);
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#endif
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*info_ptr_ptr = NULL;
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}
}
/* Initialize the info structure. This is now an internal function (0.89)
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* and applications using it are urged to use png_create_info_struct()
* instead.
*/
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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#undef png_info_init
void PNGAPI
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png_info_init(png_infop info_ptr)
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{
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/* We only come here via pre-1.0.12-compiled applications */
png_info_init_3(&info_ptr, 0);
}
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#endif
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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");
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if (info_ptr == NULL)
return;
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if (png_sizeof(png_info) > png_info_struct_size)
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{
png_destroy_struct(info_ptr);
info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
*ptr_ptr = info_ptr;
}
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/* Set everything to 0 */
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png_memset(info_ptr, 0, png_sizeof(png_info));
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}
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#ifdef PNG_FREE_ME_SUPPORTED
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void PNGAPI
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png_data_freer(png_structp png_ptr, png_infop info_ptr,
int freer, png_uint_32 mask)
{
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png_debug(1, "in png_data_freer");
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if (png_ptr == NULL || info_ptr == NULL)
return;
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if (freer == PNG_DESTROY_WILL_FREE_DATA)
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info_ptr->free_me |= mask;
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else if (freer == PNG_USER_WILL_FREE_DATA)
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info_ptr->free_me &= ~mask;
else
png_warning(png_ptr,
"Unknown freer parameter in png_data_freer.");
}
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#endif
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void PNGAPI
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png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
int num)
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{
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png_debug(1, "in png_free_data");
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if (png_ptr == NULL || info_ptr == NULL)
return;
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#ifdef PNG_TEXT_SUPPORTED
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/* Free text item num or (if num == -1) all text items */
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#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
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#else
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if (mask & PNG_FREE_TEXT)
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#endif
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{
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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;
}
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}
#endif
#ifdef PNG_tRNS_SUPPORTED
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/* Free any tRNS entry */
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#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
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#else
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if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
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#endif
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{
png_free(png_ptr, info_ptr->trans);
info_ptr->trans = NULL;
info_ptr->valid &= ~PNG_INFO_tRNS;
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#ifndef PNG_FREE_ME_SUPPORTED
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png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
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#endif
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}
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#endif
#ifdef PNG_sCAL_SUPPORTED
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/* Free any sCAL entry */
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#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
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#else
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if (mask & PNG_FREE_SCAL)
2000-05-12 11:19:53 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
2000-02-05 05:40:16 +00:00
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
2009-05-20 17:43:52 +00:00
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;
1999-12-10 15:43:02 +00:00
#endif
2009-05-20 17:43:52 +00:00
info_ptr->valid &= ~PNG_INFO_sCAL;
}
1999-12-10 15:43:02 +00:00
#endif
#ifdef PNG_pCAL_SUPPORTED
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/* Free any pCAL entry */
2000-05-12 11:19:53 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
2009-05-20 17:43:52 +00:00
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
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#else
2009-05-20 17:43:52 +00:00
if (mask & PNG_FREE_PCAL)
2000-05-12 11:19:53 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
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;
}
1999-12-10 15:43:02 +00:00
#endif
#ifdef PNG_iCCP_SUPPORTED
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/* Free any iCCP entry */
2000-05-12 11:19:53 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
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#else
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if (mask & PNG_FREE_ICCP)
2000-05-12 11:19:53 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
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;
}
1999-12-10 15:43:02 +00:00
#endif
#ifdef PNG_sPLT_SUPPORTED
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/* Free a given sPLT entry, or (if num == -1) all sPLT entries */
2000-05-12 11:19:53 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
2009-05-20 17:43:52 +00:00
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
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#else
2009-05-20 17:43:52 +00:00
if (mask & PNG_FREE_SPLT)
2000-05-12 11:19:53 +00:00
#endif
1999-12-10 15:43:02 +00:00
{
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if (num != -1)
2000-05-17 22:39:34 +00:00
{
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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;
2000-05-17 22:39:34 +00:00
}
1999-12-10 15:43:02 +00:00
}
#endif
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
2009-05-20 17:43:52 +00:00
if (png_ptr->unknown_chunk.data)
{
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
}
2008-07-25 13:38:43 +00:00
2000-05-12 11:19:53 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
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#else
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if (mask & PNG_FREE_UNKN)
2000-05-12 11:19:53 +00:00
#endif
1999-12-10 15:43:02 +00:00
{
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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;
2000-02-05 05:40:16 +00:00
2009-05-20 17:43:52 +00:00
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);
1999-12-10 15:43:02 +00:00
2009-05-20 17:43:52 +00:00
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks = NULL;
info_ptr->unknown_chunks_num = 0;
}
}
2000-02-05 05:40:16 +00:00
}
#endif
#ifdef PNG_hIST_SUPPORTED
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/* Free any hIST entry */
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#ifdef PNG_FREE_ME_SUPPORTED
2009-05-20 17:43:52 +00:00
if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
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#else
2009-05-20 17:43:52 +00:00
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
2000-05-01 14:31:54 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
png_free(png_ptr, info_ptr->hist);
info_ptr->hist = NULL;
info_ptr->valid &= ~PNG_INFO_hIST;
2002-03-07 04:08:00 +00:00
#ifndef PNG_FREE_ME_SUPPORTED
2009-05-20 17:43:52 +00:00
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
2002-03-07 04:08:00 +00:00
#endif
2009-05-20 17:43:52 +00:00
}
2000-02-05 05:40:16 +00:00
#endif
2009-05-20 17:43:52 +00:00
/* Free any PLTE entry that was internally allocated */
2000-05-01 14:31:54 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
2000-05-01 14:31:54 +00:00
#else
2009-05-20 17:43:52 +00:00
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
2000-05-01 14:31:54 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
png_zfree(png_ptr, info_ptr->palette);
info_ptr->palette = NULL;
info_ptr->valid &= ~PNG_INFO_PLTE;
2002-03-07 04:08:00 +00:00
#ifndef PNG_FREE_ME_SUPPORTED
2009-05-20 17:43:52 +00:00
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
2002-03-07 04:08:00 +00:00
#endif
2009-05-20 17:43:52 +00:00
info_ptr->num_palette = 0;
}
2000-02-05 05:40:16 +00:00
#ifdef PNG_INFO_IMAGE_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Free any image bits attached to the info structure */
2000-05-01 14:31:54 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
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if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
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#else
2009-05-20 17:43:52 +00:00
if (mask & PNG_FREE_ROWS)
2000-05-01 14:31:54 +00:00
#endif
2009-05-20 17:43:52 +00:00
{
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;
}
1999-12-10 15:43:02 +00:00
#endif
2000-05-17 22:39:34 +00:00
2000-05-01 14:31:54 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
2008-07-10 14:10:58 +00:00
if (num == -1)
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info_ptr->free_me &= ~mask;
2000-05-16 11:17:36 +00:00
else
2009-05-20 17:43:52 +00:00
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
2000-05-01 14:31:54 +00:00
#endif
2000-02-18 19:48:52 +00:00
}
1999-12-10 15:43:02 +00:00
1997-01-17 07:34:35 +00:00
/* This is an internal routine to free any memory that the info struct is
1997-05-16 07:46:07 +00:00
* pointing to before re-using it or freeing the struct itself. Recall
* that png_free() checks for NULL pointers for us.
*/
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
1997-01-17 07:34:35 +00:00
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_info_destroy");
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png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
2000-11-23 17:51:42 +00:00
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
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if (png_ptr->num_chunk_list)
{
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png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list=NULL;
png_ptr->num_chunk_list = 0;
2000-02-18 19:48:52 +00:00
}
1997-01-17 07:34:35 +00:00
#endif
2000-02-18 19:48:52 +00:00
2004-07-28 13:20:44 +00:00
png_info_init_3(&info_ptr, png_sizeof(png_info));
1995-09-26 10:22:39 +00:00
}
2006-02-21 04:09:05 +00:00
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
1995-07-20 07:43:20 +00:00
1996-06-05 20:50:50 +00:00
/* This function returns a pointer to the io_ptr associated with the user
1998-01-01 13:13:13 +00:00
* functions. The application should free any memory associated with this
* pointer before png_write_destroy() or png_read_destroy() are called.
*/
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1996-06-05 20:50:50 +00:00
png_get_io_ptr(png_structp png_ptr)
{
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if (png_ptr == NULL)
return (NULL);
1998-02-01 02:07:59 +00:00
return (png_ptr->io_ptr);
1996-06-05 20:50:50 +00:00
}
1997-05-16 07:46:07 +00:00
2006-02-21 04:09:05 +00:00
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#ifndef PNG_NO_STDIO
1997-05-16 07:46:07 +00:00
/* Initialize the default input/output functions for the PNG file. If you
1998-01-01 13:13:13 +00:00
* use your own read or write routines, you can call either png_set_read_fn()
2000-04-10 00:06:13 +00:00
* 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.
1998-01-01 13:13:13 +00:00
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
2000-07-08 18:19:41 +00:00
png_init_io(png_structp png_ptr, png_FILE_p fp)
1996-06-05 20:50:50 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_init_io");
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
png_ptr->io_ptr = (png_voidp)fp;
}
1997-05-16 07:46:07 +00:00
#endif
1998-06-06 20:31:35 +00:00
#ifdef PNG_TIME_RFC1123_SUPPORTED
1998-06-06 20:31:35 +00:00
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
2000-05-06 19:09:57 +00:00
png_charp PNGAPI
1998-06-06 20:31:35 +00:00
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{
static PNG_CONST char short_months[12][4] =
1998-12-29 17:47:59 +00:00
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
1998-06-06 20:31:35 +00:00
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return (NULL);
1998-06-06 20:31:35 +00:00
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
2004-07-28 13:20:44 +00:00
png_sizeof(char)));
1998-06-06 20:31:35 +00:00
}
#ifdef _WIN32_WCE
2001-04-20 15:32:10 +00:00
{
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);
}
2000-07-08 18:19:41 +00:00
#else
1998-06-06 20:31:35 +00:00
#ifdef USE_FAR_KEYWORD
2001-04-20 15:32:10 +00:00
{
char near_time_buf[29];
2008-07-06 11:05:04 +00:00
png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
2001-04-20 15:32:10 +00:00
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,
2004-07-28 13:20:44 +00:00
29*png_sizeof(char));
2001-04-20 15:32:10 +00:00
}
1998-06-06 20:31:35 +00:00
#else
2008-07-06 11:05:04 +00:00
png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
2001-04-15 01:15:41 +00:00
ptime->day % 32, short_months[(ptime->month - 1) % 12],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
1998-06-06 20:31:35 +00:00
#endif
2000-07-08 18:19:41 +00:00
#endif /* _WIN32_WCE */
1998-06-06 20:31:35 +00:00
return ((png_charp)png_ptr->time_buffer);
}
#endif /* PNG_TIME_RFC1123_SUPPORTED */
1998-12-29 17:47:59 +00:00
2006-02-21 04:09:05 +00:00
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
1999-11-27 16:22:33 +00:00
2000-05-06 19:09:57 +00:00
png_charp PNGAPI
1998-12-29 17:47:59 +00:00
png_get_copyright(png_structp png_ptr)
{
2009-05-20 17:43:52 +00:00
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
2009-10-18 00:18:43 +00:00
return ((png_charp) "\n libpng version 1.2.41beta06 - October 18, 2009\n\
2009-05-20 17:43:52 +00:00
Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
2002-03-26 00:49:08 +00:00
Copyright (c) 1996-1997 Andreas Dilger\n\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
1998-12-29 17:47:59 +00:00
}
1999-10-01 19:22:25 +00:00
1999-11-27 16:22:33 +00:00
/* The following return the library version as a short string in the
2004-07-18 03:45:44 +00:00
* 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.
1999-11-27 16:22:33 +00:00
*/
2000-05-06 19:09:57 +00:00
png_charp PNGAPI
1999-11-27 16:22:33 +00:00
png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
2009-05-20 17:43:52 +00:00
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
2007-05-19 05:36:49 +00:00
return ((png_charp) PNG_LIBPNG_VER_STRING);
1999-11-27 16:22:33 +00:00
}
2000-05-06 19:09:57 +00:00
png_charp PNGAPI
1999-11-27 16:22:33 +00:00
png_get_header_ver(png_structp png_ptr)
{
/* Version of *.h files used when building libpng */
2009-05-20 17:43:52 +00:00
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
2007-05-19 05:36:49 +00:00
return ((png_charp) PNG_LIBPNG_VER_STRING);
1999-11-27 16:22:33 +00:00
}
2000-05-06 19:09:57 +00:00
png_charp PNGAPI
1999-11-27 16:22:33 +00:00
png_get_header_version(png_structp png_ptr)
{
/* Returns longer string containing both version and date */
2009-05-20 17:43:52 +00:00
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
2007-07-03 21:28:18 +00:00
return ((png_charp) PNG_HEADER_VERSION_STRING
2007-09-08 03:23:17 +00:00
#ifndef PNG_READ_SUPPORTED
2007-09-02 23:31:01 +00:00
" (NO READ SUPPORT)"
2007-07-03 21:28:18 +00:00
#endif
2007-09-02 23:31:01 +00:00
"\n");
1999-11-27 16:22:33 +00:00
}
2006-02-21 04:09:05 +00:00
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
2000-02-05 05:40:16 +00:00
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2002-03-07 04:08:00 +00:00
int PNGAPI
2000-02-05 05:40:16 +00:00
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
{
2009-05-20 17:43:52 +00:00
/* Check chunk_name and return "keep" value if it's on the list, else 0 */
2000-02-05 05:40:16 +00:00
int i;
png_bytep p;
2008-07-10 14:10:58 +00:00
if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
2000-02-05 05:40:16 +00:00
return 0;
2008-07-10 14:10:58 +00:00
p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
2000-02-05 05:40:16 +00:00
if (!png_memcmp(chunk_name, p, 4))
2008-07-10 14:10:58 +00:00
return ((int)*(p + 4));
2000-02-05 05:40:16 +00:00
return 0;
}
#endif
2000-04-24 04:14:02 +00:00
/* This function, added to libpng-1.0.6g, is untested. */
2000-05-06 19:09:57 +00:00
int PNGAPI
2000-04-24 04:14:02 +00:00
png_reset_zstream(png_structp png_ptr)
{
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return Z_STREAM_ERROR;
2000-04-24 04:14:02 +00:00
return (inflateReset(&png_ptr->zstream));
}
2006-02-21 04:09:05 +00:00
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
2000-05-12 11:19:53 +00:00
2000-11-10 18:26:19 +00:00
/* This function was added to libpng-1.0.7 */
2000-05-12 11:19:53 +00:00
png_uint_32 PNGAPI
png_access_version_number(void)
{
/* Version of *.c files used when building libpng */
2004-07-18 03:45:44 +00:00
return((png_uint_32) PNG_LIBPNG_VER);
2001-05-06 10:34:26 +00:00
}
2006-12-07 04:06:25 +00:00
#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
#ifndef PNG_1_0_X
2009-05-20 17:43:52 +00:00
/* This function was added to libpng 1.2.0 */
2001-01-12 21:13:06 +00:00
int PNGAPI
png_mmx_support(void)
{
2009-05-20 17:43:52 +00:00
/* Obsolete, to be removed from libpng-1.4.0 */
2001-01-12 21:13:06 +00:00
return -1;
}
2007-05-28 13:45:13 +00:00
#endif /* PNG_1_0_X */
#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
2004-07-28 13:20:44 +00:00
2006-02-21 04:09:05 +00:00
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
2004-07-28 13:20:44 +00:00
#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)
{
2009-05-20 17:43:52 +00:00
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);
2004-07-28 13:20:44 +00:00
}
#endif /* PNG_SIZE_T */
2008-11-27 12:44:23 +00:00
/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
#ifdef PNG_cHRM_SUPPORTED
#ifndef PNG_NO_CHECK_cHRM
2009-03-21 13:10:28 +00:00
2008-11-27 12:44:23 +00:00
/*
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* 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.
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*/
void /* PRIVATE */
png_64bit_product (long v1, long v2, unsigned long *hi_product,
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unsigned long *lo_product)
{
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int a, b, c, d;
long lo, hi, x, y;
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a = (v1 >> 16) & 0xffff;
b = v1 & 0xffff;
c = (v2 >> 16) & 0xffff;
d = v2 & 0xffff;
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lo = b * d; /* BD */
x = a * d + c * b; /* AD + CB */
y = ((lo >> 16) & 0xffff) + x;
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lo = (lo & 0xffff) | ((y & 0xffff) << 16);
hi = (y >> 16) & 0xffff;
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hi += a * c; /* AC */
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*hi_product = (unsigned long)hi;
*lo_product = (unsigned long)lo;
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}
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int /* PRIVATE */
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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");
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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_NO_CHECK_cHRM */
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#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)
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#else
if (width > PNG_USER_WIDTH_MAX)
#endif
{
png_warning(png_ptr, "Image width exceeds user limit in IHDR");
error = 1;
}
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#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)
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#endif
{
png_warning(png_ptr, "Image height exceeds user limit in IHDR");
error = 1;
}
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if (width > PNG_UINT_31_MAX)
{
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png_warning(png_ptr, "Invalid image width in IHDR");
error = 1;
}
if ( height > PNG_UINT_31_MAX)
{
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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)
{
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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");
}
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#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */