| 1 |
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| 2 |
/* pngmem.c - stub functions for memory allocation
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| 3 |
*
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| 4 |
* Last changed in libpng 1.2.30 [August 15, 2008]
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| 5 |
* For conditions of distribution and use, see copyright notice in png.h
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| 6 |
* Copyright (c) 1998-2008 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This file provides a location for all memory allocation. Users who
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| 11 |
* need special memory handling are expected to supply replacement
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| 12 |
* functions for png_malloc() and png_free(), and to use
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| 13 |
* png_create_read_struct_2() and png_create_write_struct_2() to
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| 14 |
* identify the replacement functions.
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| 15 |
*/
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#define PNG_INTERNAL
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#include "png.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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/* Borland DOS special memory handler */
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| 22 |
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
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| 23 |
/* if you change this, be sure to change the one in png.h also */
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| 25 |
/* Allocate memory for a png_struct. The malloc and memset can be replaced
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| 26 |
by a single call to calloc() if this is thought to improve performance. */
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| 27 |
png_voidp /* PRIVATE */
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png_create_struct(int type)
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| 29 |
{
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| 30 |
#ifdef PNG_USER_MEM_SUPPORTED
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return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
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| 32 |
}
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| 34 |
/* Alternate version of png_create_struct, for use with user-defined malloc. */
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png_voidp /* PRIVATE */
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png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
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| 37 |
{
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| 38 |
#endif /* PNG_USER_MEM_SUPPORTED */
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png_size_t size;
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png_voidp struct_ptr;
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| 41 |
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| 42 |
if (type == PNG_STRUCT_INFO)
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| 43 |
size = png_sizeof(png_info);
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| 44 |
else if (type == PNG_STRUCT_PNG)
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size = png_sizeof(png_struct);
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else
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return (png_get_copyright(NULL));
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#ifdef PNG_USER_MEM_SUPPORTED
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| 50 |
if (malloc_fn != NULL)
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| 51 |
{
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png_struct dummy_struct;
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png_structp png_ptr = &dummy_struct;
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png_ptr->mem_ptr=mem_ptr;
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struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
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}
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else
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#endif /* PNG_USER_MEM_SUPPORTED */
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struct_ptr = (png_voidp)farmalloc(size);
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| 60 |
if (struct_ptr != NULL)
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png_memset(struct_ptr, 0, size);
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return (struct_ptr);
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}
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/* Free memory allocated by a png_create_struct() call */
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void /* PRIVATE */
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png_destroy_struct(png_voidp struct_ptr)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
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}
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/* Free memory allocated by a png_create_struct() call */
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void /* PRIVATE */
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png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
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png_voidp mem_ptr)
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{
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#endif
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if (struct_ptr != NULL)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
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| 82 |
if (free_fn != NULL)
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{
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png_struct dummy_struct;
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png_structp png_ptr = &dummy_struct;
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png_ptr->mem_ptr=mem_ptr;
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(*(free_fn))(png_ptr, struct_ptr);
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return;
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}
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#endif /* PNG_USER_MEM_SUPPORTED */
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farfree (struct_ptr);
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}
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}
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/* Allocate memory. For reasonable files, size should never exceed
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* 64K. However, zlib may allocate more then 64K if you don't tell
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* it not to. See zconf.h and png.h for more information. zlib does
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* need to allocate exactly 64K, so whatever you call here must
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* have the ability to do that.
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*
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* Borland seems to have a problem in DOS mode for exactly 64K.
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* It gives you a segment with an offset of 8 (perhaps to store its
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* memory stuff). zlib doesn't like this at all, so we have to
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* detect and deal with it. This code should not be needed in
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* Windows or OS/2 modes, and only in 16 bit mode. This code has
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* been updated by Alexander Lehmann for version 0.89 to waste less
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* memory.
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*
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* Note that we can't use png_size_t for the "size" declaration,
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* since on some systems a png_size_t is a 16-bit quantity, and as a
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* result, we would be truncating potentially larger memory requests
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* (which should cause a fatal error) and introducing major problems.
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*/
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png_voidp PNGAPI
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png_malloc(png_structp png_ptr, png_uint_32 size)
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{
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png_voidp ret;
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if (png_ptr == NULL || size == 0)
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return (NULL);
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#ifdef PNG_USER_MEM_SUPPORTED
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if (png_ptr->malloc_fn != NULL)
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ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
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else
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ret = (png_malloc_default(png_ptr, size));
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if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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png_error(png_ptr, "Out of memory!");
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return (ret);
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}
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png_voidp PNGAPI
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png_malloc_default(png_structp png_ptr, png_uint_32 size)
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{
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png_voidp ret;
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#endif /* PNG_USER_MEM_SUPPORTED */
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if (png_ptr == NULL || size == 0)
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return (NULL);
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#ifdef PNG_MAX_MALLOC_64K
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if (size > (png_uint_32)65536L)
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{
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png_warning(png_ptr, "Cannot Allocate > 64K");
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ret = NULL;
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}
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else
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#endif
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if (size != (size_t)size)
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ret = NULL;
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else if (size == (png_uint_32)65536L)
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{
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if (png_ptr->offset_table == NULL)
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{
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/* try to see if we need to do any of this fancy stuff */
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ret = farmalloc(size);
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if (ret == NULL || ((png_size_t)ret & 0xffff))
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{
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int num_blocks;
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png_uint_32 total_size;
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png_bytep table;
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int i;
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png_byte huge * hptr;
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if (ret != NULL)
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{
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farfree(ret);
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ret = NULL;
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}
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if (png_ptr->zlib_window_bits > 14)
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num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
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else
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num_blocks = 1;
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if (png_ptr->zlib_mem_level >= 7)
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num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
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else
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num_blocks++;
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total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
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table = farmalloc(total_size);
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if (table == NULL)
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{
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#ifndef PNG_USER_MEM_SUPPORTED
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
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else
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png_warning(png_ptr, "Out Of Memory.");
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#endif
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return (NULL);
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}
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if ((png_size_t)table & 0xfff0)
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{
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#ifndef PNG_USER_MEM_SUPPORTED
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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png_error(png_ptr,
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"Farmalloc didn't return normalized pointer");
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else
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png_warning(png_ptr,
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"Farmalloc didn't return normalized pointer");
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#endif
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return (NULL);
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}
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png_ptr->offset_table = table;
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png_ptr->offset_table_ptr = farmalloc(num_blocks *
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png_sizeof(png_bytep));
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if (png_ptr->offset_table_ptr == NULL)
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{
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#ifndef PNG_USER_MEM_SUPPORTED
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
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else
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png_warning(png_ptr, "Out Of memory.");
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#endif
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return (NULL);
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}
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hptr = (png_byte huge *)table;
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if ((png_size_t)hptr & 0xf)
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{
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hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
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hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
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}
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for (i = 0; i < num_blocks; i++)
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{
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png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
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hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
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}
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png_ptr->offset_table_number = num_blocks;
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png_ptr->offset_table_count = 0;
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png_ptr->offset_table_count_free = 0;
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}
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}
|
| 242 |
|
| 243 |
if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
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{
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| 245 |
#ifndef PNG_USER_MEM_SUPPORTED
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| 246 |
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
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else
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png_warning(png_ptr, "Out of Memory.");
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#endif
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| 251 |
return (NULL);
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| 252 |
}
|
| 253 |
|
| 254 |
ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
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}
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| 256 |
else
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ret = farmalloc(size);
|
| 258 |
|
| 259 |
#ifndef PNG_USER_MEM_SUPPORTED
|
| 260 |
if (ret == NULL)
|
| 261 |
{
|
| 262 |
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
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| 263 |
png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
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| 264 |
else
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| 265 |
png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
|
| 266 |
}
|
| 267 |
#endif
|
| 268 |
|
| 269 |
return (ret);
|
| 270 |
}
|
| 271 |
|
| 272 |
/* free a pointer allocated by png_malloc(). In the default
|
| 273 |
configuration, png_ptr is not used, but is passed in case it
|
| 274 |
is needed. If ptr is NULL, return without taking any action. */
|
| 275 |
|
| 276 |
void PNGAPI
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| 277 |
png_free(png_structp png_ptr, png_voidp ptr)
|
| 278 |
{
|
| 279 |
if (png_ptr == NULL || ptr == NULL)
|
| 280 |
return;
|
| 281 |
|
| 282 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 283 |
if (png_ptr->free_fn != NULL)
|
| 284 |
{
|
| 285 |
(*(png_ptr->free_fn))(png_ptr, ptr);
|
| 286 |
return;
|
| 287 |
}
|
| 288 |
else png_free_default(png_ptr, ptr);
|
| 289 |
}
|
| 290 |
|
| 291 |
void PNGAPI
|
| 292 |
png_free_default(png_structp png_ptr, png_voidp ptr)
|
| 293 |
{
|
| 294 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 295 |
|
| 296 |
if (png_ptr == NULL || ptr == NULL) return;
|
| 297 |
|
| 298 |
if (png_ptr->offset_table != NULL)
|
| 299 |
{
|
| 300 |
int i;
|
| 301 |
|
| 302 |
for (i = 0; i < png_ptr->offset_table_count; i++)
|
| 303 |
{
|
| 304 |
if (ptr == png_ptr->offset_table_ptr[i])
|
| 305 |
{
|
| 306 |
ptr = NULL;
|
| 307 |
png_ptr->offset_table_count_free++;
|
| 308 |
break;
|
| 309 |
}
|
| 310 |
}
|
| 311 |
if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
|
| 312 |
{
|
| 313 |
farfree(png_ptr->offset_table);
|
| 314 |
farfree(png_ptr->offset_table_ptr);
|
| 315 |
png_ptr->offset_table = NULL;
|
| 316 |
png_ptr->offset_table_ptr = NULL;
|
| 317 |
}
|
| 318 |
}
|
| 319 |
|
| 320 |
if (ptr != NULL)
|
| 321 |
{
|
| 322 |
farfree(ptr);
|
| 323 |
}
|
| 324 |
}
|
| 325 |
|
| 326 |
#else /* Not the Borland DOS special memory handler */
|
| 327 |
|
| 328 |
/* Allocate memory for a png_struct or a png_info. The malloc and
|
| 329 |
memset can be replaced by a single call to calloc() if this is thought
|
| 330 |
to improve performance noticably. */
|
| 331 |
png_voidp /* PRIVATE */
|
| 332 |
png_create_struct(int type)
|
| 333 |
{
|
| 334 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 335 |
return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
|
| 336 |
}
|
| 337 |
|
| 338 |
/* Allocate memory for a png_struct or a png_info. The malloc and
|
| 339 |
memset can be replaced by a single call to calloc() if this is thought
|
| 340 |
to improve performance noticably. */
|
| 341 |
png_voidp /* PRIVATE */
|
| 342 |
png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
|
| 343 |
{
|
| 344 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 345 |
png_size_t size;
|
| 346 |
png_voidp struct_ptr;
|
| 347 |
|
| 348 |
if (type == PNG_STRUCT_INFO)
|
| 349 |
size = png_sizeof(png_info);
|
| 350 |
else if (type == PNG_STRUCT_PNG)
|
| 351 |
size = png_sizeof(png_struct);
|
| 352 |
else
|
| 353 |
return (NULL);
|
| 354 |
|
| 355 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 356 |
if (malloc_fn != NULL)
|
| 357 |
{
|
| 358 |
png_struct dummy_struct;
|
| 359 |
png_structp png_ptr = &dummy_struct;
|
| 360 |
png_ptr->mem_ptr=mem_ptr;
|
| 361 |
struct_ptr = (*(malloc_fn))(png_ptr, size);
|
| 362 |
if (struct_ptr != NULL)
|
| 363 |
png_memset(struct_ptr, 0, size);
|
| 364 |
return (struct_ptr);
|
| 365 |
}
|
| 366 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 367 |
|
| 368 |
#if defined(__TURBOC__) && !defined(__FLAT__)
|
| 369 |
struct_ptr = (png_voidp)farmalloc(size);
|
| 370 |
#else
|
| 371 |
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
| 372 |
struct_ptr = (png_voidp)halloc(size, 1);
|
| 373 |
# else
|
| 374 |
struct_ptr = (png_voidp)malloc(size);
|
| 375 |
# endif
|
| 376 |
#endif
|
| 377 |
if (struct_ptr != NULL)
|
| 378 |
png_memset(struct_ptr, 0, size);
|
| 379 |
|
| 380 |
return (struct_ptr);
|
| 381 |
}
|
| 382 |
|
| 383 |
|
| 384 |
/* Free memory allocated by a png_create_struct() call */
|
| 385 |
void /* PRIVATE */
|
| 386 |
png_destroy_struct(png_voidp struct_ptr)
|
| 387 |
{
|
| 388 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 389 |
png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
|
| 390 |
}
|
| 391 |
|
| 392 |
/* Free memory allocated by a png_create_struct() call */
|
| 393 |
void /* PRIVATE */
|
| 394 |
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
|
| 395 |
png_voidp mem_ptr)
|
| 396 |
{
|
| 397 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 398 |
if (struct_ptr != NULL)
|
| 399 |
{
|
| 400 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 401 |
if (free_fn != NULL)
|
| 402 |
{
|
| 403 |
png_struct dummy_struct;
|
| 404 |
png_structp png_ptr = &dummy_struct;
|
| 405 |
png_ptr->mem_ptr=mem_ptr;
|
| 406 |
(*(free_fn))(png_ptr, struct_ptr);
|
| 407 |
return;
|
| 408 |
}
|
| 409 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 410 |
#if defined(__TURBOC__) && !defined(__FLAT__)
|
| 411 |
farfree(struct_ptr);
|
| 412 |
#else
|
| 413 |
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
| 414 |
hfree(struct_ptr);
|
| 415 |
# else
|
| 416 |
free(struct_ptr);
|
| 417 |
# endif
|
| 418 |
#endif
|
| 419 |
}
|
| 420 |
}
|
| 421 |
|
| 422 |
/* Allocate memory. For reasonable files, size should never exceed
|
| 423 |
64K. However, zlib may allocate more then 64K if you don't tell
|
| 424 |
it not to. See zconf.h and png.h for more information. zlib does
|
| 425 |
need to allocate exactly 64K, so whatever you call here must
|
| 426 |
have the ability to do that. */
|
| 427 |
|
| 428 |
|
| 429 |
png_voidp PNGAPI
|
| 430 |
png_malloc(png_structp png_ptr, png_uint_32 size)
|
| 431 |
{
|
| 432 |
png_voidp ret;
|
| 433 |
|
| 434 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 435 |
if (png_ptr == NULL || size == 0)
|
| 436 |
return (NULL);
|
| 437 |
|
| 438 |
if (png_ptr->malloc_fn != NULL)
|
| 439 |
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
|
| 440 |
else
|
| 441 |
ret = (png_malloc_default(png_ptr, size));
|
| 442 |
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
|
| 443 |
png_error(png_ptr, "Out of Memory!");
|
| 444 |
return (ret);
|
| 445 |
}
|
| 446 |
|
| 447 |
png_voidp PNGAPI
|
| 448 |
png_malloc_default(png_structp png_ptr, png_uint_32 size)
|
| 449 |
{
|
| 450 |
png_voidp ret;
|
| 451 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 452 |
|
| 453 |
if (png_ptr == NULL || size == 0)
|
| 454 |
return (NULL);
|
| 455 |
|
| 456 |
#ifdef PNG_MAX_MALLOC_64K
|
| 457 |
if (size > (png_uint_32)65536L)
|
| 458 |
{
|
| 459 |
#ifndef PNG_USER_MEM_SUPPORTED
|
| 460 |
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
|
| 461 |
png_error(png_ptr, "Cannot Allocate > 64K");
|
| 462 |
else
|
| 463 |
#endif
|
| 464 |
return NULL;
|
| 465 |
}
|
| 466 |
#endif
|
| 467 |
|
| 468 |
/* Check for overflow */
|
| 469 |
#if defined(__TURBOC__) && !defined(__FLAT__)
|
| 470 |
if (size != (unsigned long)size)
|
| 471 |
ret = NULL;
|
| 472 |
else
|
| 473 |
ret = farmalloc(size);
|
| 474 |
#else
|
| 475 |
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
| 476 |
if (size != (unsigned long)size)
|
| 477 |
ret = NULL;
|
| 478 |
else
|
| 479 |
ret = halloc(size, 1);
|
| 480 |
# else
|
| 481 |
if (size != (size_t)size)
|
| 482 |
ret = NULL;
|
| 483 |
else
|
| 484 |
ret = malloc((size_t)size);
|
| 485 |
# endif
|
| 486 |
#endif
|
| 487 |
|
| 488 |
#ifndef PNG_USER_MEM_SUPPORTED
|
| 489 |
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
|
| 490 |
png_error(png_ptr, "Out of Memory");
|
| 491 |
#endif
|
| 492 |
|
| 493 |
return (ret);
|
| 494 |
}
|
| 495 |
|
| 496 |
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
|
| 497 |
without taking any action. */
|
| 498 |
void PNGAPI
|
| 499 |
png_free(png_structp png_ptr, png_voidp ptr)
|
| 500 |
{
|
| 501 |
if (png_ptr == NULL || ptr == NULL)
|
| 502 |
return;
|
| 503 |
|
| 504 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 505 |
if (png_ptr->free_fn != NULL)
|
| 506 |
{
|
| 507 |
(*(png_ptr->free_fn))(png_ptr, ptr);
|
| 508 |
return;
|
| 509 |
}
|
| 510 |
else png_free_default(png_ptr, ptr);
|
| 511 |
}
|
| 512 |
void PNGAPI
|
| 513 |
png_free_default(png_structp png_ptr, png_voidp ptr)
|
| 514 |
{
|
| 515 |
if (png_ptr == NULL || ptr == NULL)
|
| 516 |
return;
|
| 517 |
|
| 518 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 519 |
|
| 520 |
#if defined(__TURBOC__) && !defined(__FLAT__)
|
| 521 |
farfree(ptr);
|
| 522 |
#else
|
| 523 |
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
| 524 |
hfree(ptr);
|
| 525 |
# else
|
| 526 |
free(ptr);
|
| 527 |
# endif
|
| 528 |
#endif
|
| 529 |
}
|
| 530 |
|
| 531 |
#endif /* Not Borland DOS special memory handler */
|
| 532 |
|
| 533 |
#if defined(PNG_1_0_X)
|
| 534 |
# define png_malloc_warn png_malloc
|
| 535 |
#else
|
| 536 |
/* This function was added at libpng version 1.2.3. The png_malloc_warn()
|
| 537 |
* function will set up png_malloc() to issue a png_warning and return NULL
|
| 538 |
* instead of issuing a png_error, if it fails to allocate the requested
|
| 539 |
* memory.
|
| 540 |
*/
|
| 541 |
png_voidp PNGAPI
|
| 542 |
png_malloc_warn(png_structp png_ptr, png_uint_32 size)
|
| 543 |
{
|
| 544 |
png_voidp ptr;
|
| 545 |
png_uint_32 save_flags;
|
| 546 |
if (png_ptr == NULL) return (NULL);
|
| 547 |
|
| 548 |
save_flags = png_ptr->flags;
|
| 549 |
png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
|
| 550 |
ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
|
| 551 |
png_ptr->flags=save_flags;
|
| 552 |
return(ptr);
|
| 553 |
}
|
| 554 |
#endif
|
| 555 |
|
| 556 |
png_voidp PNGAPI
|
| 557 |
png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
|
| 558 |
png_uint_32 length)
|
| 559 |
{
|
| 560 |
png_size_t size;
|
| 561 |
|
| 562 |
size = (png_size_t)length;
|
| 563 |
if ((png_uint_32)size != length)
|
| 564 |
png_error(png_ptr, "Overflow in png_memcpy_check.");
|
| 565 |
|
| 566 |
return(png_memcpy (s1, s2, size));
|
| 567 |
}
|
| 568 |
|
| 569 |
png_voidp PNGAPI
|
| 570 |
png_memset_check (png_structp png_ptr, png_voidp s1, int value,
|
| 571 |
png_uint_32 length)
|
| 572 |
{
|
| 573 |
png_size_t size;
|
| 574 |
|
| 575 |
size = (png_size_t)length;
|
| 576 |
if ((png_uint_32)size != length)
|
| 577 |
png_error(png_ptr, "Overflow in png_memset_check.");
|
| 578 |
|
| 579 |
return (png_memset (s1, value, size));
|
| 580 |
|
| 581 |
}
|
| 582 |
|
| 583 |
#ifdef PNG_USER_MEM_SUPPORTED
|
| 584 |
/* This function is called when the application wants to use another method
|
| 585 |
* of allocating and freeing memory.
|
| 586 |
*/
|
| 587 |
void PNGAPI
|
| 588 |
png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
|
| 589 |
malloc_fn, png_free_ptr free_fn)
|
| 590 |
{
|
| 591 |
if (png_ptr != NULL)
|
| 592 |
{
|
| 593 |
png_ptr->mem_ptr = mem_ptr;
|
| 594 |
png_ptr->malloc_fn = malloc_fn;
|
| 595 |
png_ptr->free_fn = free_fn;
|
| 596 |
}
|
| 597 |
}
|
| 598 |
|
| 599 |
/* This function returns a pointer to the mem_ptr associated with the user
|
| 600 |
* functions. The application should free any memory associated with this
|
| 601 |
* pointer before png_write_destroy and png_read_destroy are called.
|
| 602 |
*/
|
| 603 |
png_voidp PNGAPI
|
| 604 |
png_get_mem_ptr(png_structp png_ptr)
|
| 605 |
{
|
| 606 |
if (png_ptr == NULL) return (NULL);
|
| 607 |
return ((png_voidp)png_ptr->mem_ptr);
|
| 608 |
}
|
| 609 |
#endif /* PNG_USER_MEM_SUPPORTED */
|
| 610 |
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
|
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| 
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