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william |
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/* pngmem.c - stub functions for memory allocation |
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* |
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* Last changed in libpng 1.2.37 [June 4, 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) |
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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 code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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* |
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* This file provides a location for all memory allocation. Users who |
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* need special memory handling are expected to supply replacement |
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* functions for png_malloc() and png_free(), and to use |
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* png_create_read_struct_2() and png_create_write_struct_2() to |
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* identify the replacement functions. |
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*/ |
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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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#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
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/* If you change this, be sure to change the one in png.h also */ |
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/* Allocate memory for a png_struct. The malloc and memset can be replaced |
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by a single call to calloc() if this is thought to improve performance. */ |
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png_voidp /* PRIVATE */ |
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png_create_struct(int type) |
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{ |
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#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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} |
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/* 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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{ |
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#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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if (type == PNG_STRUCT_INFO) |
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size = png_sizeof(png_info); |
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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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if (malloc_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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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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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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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; |
| 174 |
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} |
| 175 |
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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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| 200 |
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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 |
| 210 |
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return (NULL); |
| 211 |
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} |
| 212 |
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| 213 |
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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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| 217 |
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if (png_ptr->offset_table_ptr == NULL) |
| 218 |
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{ |
| 219 |
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#ifndef PNG_USER_MEM_SUPPORTED |
| 220 |
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 221 |
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png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */ |
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else |
| 223 |
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png_warning(png_ptr, "Out Of memory."); |
| 224 |
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#endif |
| 225 |
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return (NULL); |
| 226 |
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} |
| 227 |
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| 228 |
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hptr = (png_byte huge *)table; |
| 229 |
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if ((png_size_t)hptr & 0xf) |
| 230 |
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{ |
| 231 |
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hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); |
| 232 |
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hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */ |
| 233 |
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} |
| 234 |
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for (i = 0; i < num_blocks; i++) |
| 235 |
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{ |
| 236 |
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png_ptr->offset_table_ptr[i] = (png_bytep)hptr; |
| 237 |
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hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */ |
| 238 |
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} |
| 239 |
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| 240 |
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png_ptr->offset_table_number = num_blocks; |
| 241 |
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png_ptr->offset_table_count = 0; |
| 242 |
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png_ptr->offset_table_count_free = 0; |
| 243 |
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} |
| 244 |
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} |
| 245 |
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| 246 |
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if (png_ptr->offset_table_count >= png_ptr->offset_table_number) |
| 247 |
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{ |
| 248 |
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#ifndef PNG_USER_MEM_SUPPORTED |
| 249 |
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 250 |
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png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */ |
| 251 |
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else |
| 252 |
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png_warning(png_ptr, "Out of Memory."); |
| 253 |
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#endif |
| 254 |
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return (NULL); |
| 255 |
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} |
| 256 |
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| 257 |
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ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; |
| 258 |
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} |
| 259 |
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else |
| 260 |
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ret = farmalloc(size); |
| 261 |
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| 262 |
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#ifndef PNG_USER_MEM_SUPPORTED |
| 263 |
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if (ret == NULL) |
| 264 |
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{ |
| 265 |
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if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 266 |
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png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */ |
| 267 |
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else |
| 268 |
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png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */ |
| 269 |
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} |
| 270 |
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#endif |
| 271 |
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| 272 |
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return (ret); |
| 273 |
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} |
| 274 |
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| 275 |
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/* Free a pointer allocated by png_malloc(). In the default |
| 276 |
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* configuration, png_ptr is not used, but is passed in case it |
| 277 |
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* is needed. If ptr is NULL, return without taking any action. |
| 278 |
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*/ |
| 279 |
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void PNGAPI |
| 280 |
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png_free(png_structp png_ptr, png_voidp ptr) |
| 281 |
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{ |
| 282 |
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if (png_ptr == NULL || ptr == NULL) |
| 283 |
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return; |
| 284 |
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| 285 |
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#ifdef PNG_USER_MEM_SUPPORTED |
| 286 |
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if (png_ptr->free_fn != NULL) |
| 287 |
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{ |
| 288 |
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(*(png_ptr->free_fn))(png_ptr, ptr); |
| 289 |
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return; |
| 290 |
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} |
| 291 |
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else |
| 292 |
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png_free_default(png_ptr, ptr); |
| 293 |
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} |
| 294 |
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|
| 295 |
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void PNGAPI |
| 296 |
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png_free_default(png_structp png_ptr, png_voidp ptr) |
| 297 |
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{ |
| 298 |
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#endif /* PNG_USER_MEM_SUPPORTED */ |
| 299 |
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|
| 300 |
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if (png_ptr == NULL || ptr == NULL) |
| 301 |
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return; |
| 302 |
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|
| 303 |
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if (png_ptr->offset_table != NULL) |
| 304 |
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{ |
| 305 |
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int i; |
| 306 |
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|
| 307 |
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for (i = 0; i < png_ptr->offset_table_count; i++) |
| 308 |
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{ |
| 309 |
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if (ptr == png_ptr->offset_table_ptr[i]) |
| 310 |
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{ |
| 311 |
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ptr = NULL; |
| 312 |
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png_ptr->offset_table_count_free++; |
| 313 |
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break; |
| 314 |
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} |
| 315 |
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} |
| 316 |
|
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if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) |
| 317 |
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{ |
| 318 |
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farfree(png_ptr->offset_table); |
| 319 |
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farfree(png_ptr->offset_table_ptr); |
| 320 |
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png_ptr->offset_table = NULL; |
| 321 |
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png_ptr->offset_table_ptr = NULL; |
| 322 |
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} |
| 323 |
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} |
| 324 |
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|
| 325 |
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if (ptr != NULL) |
| 326 |
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{ |
| 327 |
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farfree(ptr); |
| 328 |
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} |
| 329 |
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} |
| 330 |
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|
| 331 |
|
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#else /* Not the Borland DOS special memory handler */ |
| 332 |
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|
| 333 |
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/* Allocate memory for a png_struct or a png_info. The malloc and |
| 334 |
|
|
memset can be replaced by a single call to calloc() if this is thought |
| 335 |
|
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to improve performance noticably. */ |
| 336 |
|
|
png_voidp /* PRIVATE */ |
| 337 |
|
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png_create_struct(int type) |
| 338 |
|
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{ |
| 339 |
|
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#ifdef PNG_USER_MEM_SUPPORTED |
| 340 |
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return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL)); |
| 341 |
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} |
| 342 |
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|
| 343 |
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/* Allocate memory for a png_struct or a png_info. The malloc and |
| 344 |
|
|
memset can be replaced by a single call to calloc() if this is thought |
| 345 |
|
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to improve performance noticably. */ |
| 346 |
|
|
png_voidp /* PRIVATE */ |
| 347 |
|
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png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr) |
| 348 |
|
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{ |
| 349 |
|
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#endif /* PNG_USER_MEM_SUPPORTED */ |
| 350 |
|
|
png_size_t size; |
| 351 |
|
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png_voidp struct_ptr; |
| 352 |
|
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|
| 353 |
|
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if (type == PNG_STRUCT_INFO) |
| 354 |
|
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size = png_sizeof(png_info); |
| 355 |
|
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else if (type == PNG_STRUCT_PNG) |
| 356 |
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size = png_sizeof(png_struct); |
| 357 |
|
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else |
| 358 |
|
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return (NULL); |
| 359 |
|
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|
| 360 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 361 |
|
|
if (malloc_fn != NULL) |
| 362 |
|
|
{ |
| 363 |
|
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png_struct dummy_struct; |
| 364 |
|
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png_structp png_ptr = &dummy_struct; |
| 365 |
|
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png_ptr->mem_ptr=mem_ptr; |
| 366 |
|
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struct_ptr = (*(malloc_fn))(png_ptr, size); |
| 367 |
|
|
if (struct_ptr != NULL) |
| 368 |
|
|
png_memset(struct_ptr, 0, size); |
| 369 |
|
|
return (struct_ptr); |
| 370 |
|
|
} |
| 371 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 372 |
|
|
|
| 373 |
|
|
#if defined(__TURBOC__) && !defined(__FLAT__) |
| 374 |
|
|
struct_ptr = (png_voidp)farmalloc(size); |
| 375 |
|
|
#else |
| 376 |
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 377 |
|
|
struct_ptr = (png_voidp)halloc(size, 1); |
| 378 |
|
|
# else |
| 379 |
|
|
struct_ptr = (png_voidp)malloc(size); |
| 380 |
|
|
# endif |
| 381 |
|
|
#endif |
| 382 |
|
|
if (struct_ptr != NULL) |
| 383 |
|
|
png_memset(struct_ptr, 0, size); |
| 384 |
|
|
|
| 385 |
|
|
return (struct_ptr); |
| 386 |
|
|
} |
| 387 |
|
|
|
| 388 |
|
|
|
| 389 |
|
|
/* Free memory allocated by a png_create_struct() call */ |
| 390 |
|
|
void /* PRIVATE */ |
| 391 |
|
|
png_destroy_struct(png_voidp struct_ptr) |
| 392 |
|
|
{ |
| 393 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 394 |
|
|
png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL); |
| 395 |
|
|
} |
| 396 |
|
|
|
| 397 |
|
|
/* Free memory allocated by a png_create_struct() call */ |
| 398 |
|
|
void /* PRIVATE */ |
| 399 |
|
|
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, |
| 400 |
|
|
png_voidp mem_ptr) |
| 401 |
|
|
{ |
| 402 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 403 |
|
|
if (struct_ptr != NULL) |
| 404 |
|
|
{ |
| 405 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 406 |
|
|
if (free_fn != NULL) |
| 407 |
|
|
{ |
| 408 |
|
|
png_struct dummy_struct; |
| 409 |
|
|
png_structp png_ptr = &dummy_struct; |
| 410 |
|
|
png_ptr->mem_ptr=mem_ptr; |
| 411 |
|
|
(*(free_fn))(png_ptr, struct_ptr); |
| 412 |
|
|
return; |
| 413 |
|
|
} |
| 414 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 415 |
|
|
#if defined(__TURBOC__) && !defined(__FLAT__) |
| 416 |
|
|
farfree(struct_ptr); |
| 417 |
|
|
#else |
| 418 |
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 419 |
|
|
hfree(struct_ptr); |
| 420 |
|
|
# else |
| 421 |
|
|
free(struct_ptr); |
| 422 |
|
|
# endif |
| 423 |
|
|
#endif |
| 424 |
|
|
} |
| 425 |
|
|
} |
| 426 |
|
|
|
| 427 |
|
|
/* Allocate memory. For reasonable files, size should never exceed |
| 428 |
|
|
* 64K. However, zlib may allocate more then 64K if you don't tell |
| 429 |
|
|
* it not to. See zconf.h and png.h for more information. zlib does |
| 430 |
|
|
* need to allocate exactly 64K, so whatever you call here must |
| 431 |
|
|
* have the ability to do that. |
| 432 |
|
|
*/ |
| 433 |
|
|
|
| 434 |
|
|
|
| 435 |
|
|
png_voidp PNGAPI |
| 436 |
|
|
png_malloc(png_structp png_ptr, png_uint_32 size) |
| 437 |
|
|
{ |
| 438 |
|
|
png_voidp ret; |
| 439 |
|
|
|
| 440 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 441 |
|
|
if (png_ptr == NULL || size == 0) |
| 442 |
|
|
return (NULL); |
| 443 |
|
|
|
| 444 |
|
|
if (png_ptr->malloc_fn != NULL) |
| 445 |
|
|
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); |
| 446 |
|
|
else |
| 447 |
|
|
ret = (png_malloc_default(png_ptr, size)); |
| 448 |
|
|
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 449 |
|
|
png_error(png_ptr, "Out of Memory!"); |
| 450 |
|
|
return (ret); |
| 451 |
|
|
} |
| 452 |
|
|
|
| 453 |
|
|
png_voidp PNGAPI |
| 454 |
|
|
png_malloc_default(png_structp png_ptr, png_uint_32 size) |
| 455 |
|
|
{ |
| 456 |
|
|
png_voidp ret; |
| 457 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 458 |
|
|
|
| 459 |
|
|
if (png_ptr == NULL || size == 0) |
| 460 |
|
|
return (NULL); |
| 461 |
|
|
|
| 462 |
|
|
#ifdef PNG_MAX_MALLOC_64K |
| 463 |
|
|
if (size > (png_uint_32)65536L) |
| 464 |
|
|
{ |
| 465 |
|
|
#ifndef PNG_USER_MEM_SUPPORTED |
| 466 |
|
|
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 467 |
|
|
png_error(png_ptr, "Cannot Allocate > 64K"); |
| 468 |
|
|
else |
| 469 |
|
|
#endif |
| 470 |
|
|
return NULL; |
| 471 |
|
|
} |
| 472 |
|
|
#endif |
| 473 |
|
|
|
| 474 |
|
|
/* Check for overflow */ |
| 475 |
|
|
#if defined(__TURBOC__) && !defined(__FLAT__) |
| 476 |
|
|
if (size != (unsigned long)size) |
| 477 |
|
|
ret = NULL; |
| 478 |
|
|
else |
| 479 |
|
|
ret = farmalloc(size); |
| 480 |
|
|
#else |
| 481 |
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 482 |
|
|
if (size != (unsigned long)size) |
| 483 |
|
|
ret = NULL; |
| 484 |
|
|
else |
| 485 |
|
|
ret = halloc(size, 1); |
| 486 |
|
|
# else |
| 487 |
|
|
if (size != (size_t)size) |
| 488 |
|
|
ret = NULL; |
| 489 |
|
|
else |
| 490 |
|
|
ret = malloc((size_t)size); |
| 491 |
|
|
# endif |
| 492 |
|
|
#endif |
| 493 |
|
|
|
| 494 |
|
|
#ifndef PNG_USER_MEM_SUPPORTED |
| 495 |
|
|
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) |
| 496 |
|
|
png_error(png_ptr, "Out of Memory"); |
| 497 |
|
|
#endif |
| 498 |
|
|
|
| 499 |
|
|
return (ret); |
| 500 |
|
|
} |
| 501 |
|
|
|
| 502 |
|
|
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return |
| 503 |
|
|
* without taking any action. |
| 504 |
|
|
*/ |
| 505 |
|
|
void PNGAPI |
| 506 |
|
|
png_free(png_structp png_ptr, png_voidp ptr) |
| 507 |
|
|
{ |
| 508 |
|
|
if (png_ptr == NULL || ptr == NULL) |
| 509 |
|
|
return; |
| 510 |
|
|
|
| 511 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 512 |
|
|
if (png_ptr->free_fn != NULL) |
| 513 |
|
|
{ |
| 514 |
|
|
(*(png_ptr->free_fn))(png_ptr, ptr); |
| 515 |
|
|
return; |
| 516 |
|
|
} |
| 517 |
|
|
else |
| 518 |
|
|
png_free_default(png_ptr, ptr); |
| 519 |
|
|
} |
| 520 |
|
|
void PNGAPI |
| 521 |
|
|
png_free_default(png_structp png_ptr, png_voidp ptr) |
| 522 |
|
|
{ |
| 523 |
|
|
if (png_ptr == NULL || ptr == NULL) |
| 524 |
|
|
return; |
| 525 |
|
|
|
| 526 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 527 |
|
|
|
| 528 |
|
|
#if defined(__TURBOC__) && !defined(__FLAT__) |
| 529 |
|
|
farfree(ptr); |
| 530 |
|
|
#else |
| 531 |
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 532 |
|
|
hfree(ptr); |
| 533 |
|
|
# else |
| 534 |
|
|
free(ptr); |
| 535 |
|
|
# endif |
| 536 |
|
|
#endif |
| 537 |
|
|
} |
| 538 |
|
|
|
| 539 |
|
|
#endif /* Not Borland DOS special memory handler */ |
| 540 |
|
|
|
| 541 |
|
|
#if defined(PNG_1_0_X) |
| 542 |
|
|
# define png_malloc_warn png_malloc |
| 543 |
|
|
#else |
| 544 |
|
|
/* This function was added at libpng version 1.2.3. The png_malloc_warn() |
| 545 |
|
|
* function will set up png_malloc() to issue a png_warning and return NULL |
| 546 |
|
|
* instead of issuing a png_error, if it fails to allocate the requested |
| 547 |
|
|
* memory. |
| 548 |
|
|
*/ |
| 549 |
|
|
png_voidp PNGAPI |
| 550 |
|
|
png_malloc_warn(png_structp png_ptr, png_uint_32 size) |
| 551 |
|
|
{ |
| 552 |
|
|
png_voidp ptr; |
| 553 |
|
|
png_uint_32 save_flags; |
| 554 |
|
|
if (png_ptr == NULL) |
| 555 |
|
|
return (NULL); |
| 556 |
|
|
|
| 557 |
|
|
save_flags = png_ptr->flags; |
| 558 |
|
|
png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; |
| 559 |
|
|
ptr = (png_voidp)png_malloc((png_structp)png_ptr, size); |
| 560 |
|
|
png_ptr->flags=save_flags; |
| 561 |
|
|
return(ptr); |
| 562 |
|
|
} |
| 563 |
|
|
#endif |
| 564 |
|
|
|
| 565 |
|
|
png_voidp PNGAPI |
| 566 |
|
|
png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2, |
| 567 |
|
|
png_uint_32 length) |
| 568 |
|
|
{ |
| 569 |
|
|
png_size_t size; |
| 570 |
|
|
|
| 571 |
|
|
size = (png_size_t)length; |
| 572 |
|
|
if ((png_uint_32)size != length) |
| 573 |
|
|
png_error(png_ptr, "Overflow in png_memcpy_check."); |
| 574 |
|
|
|
| 575 |
|
|
return(png_memcpy (s1, s2, size)); |
| 576 |
|
|
} |
| 577 |
|
|
|
| 578 |
|
|
png_voidp PNGAPI |
| 579 |
|
|
png_memset_check (png_structp png_ptr, png_voidp s1, int value, |
| 580 |
|
|
png_uint_32 length) |
| 581 |
|
|
{ |
| 582 |
|
|
png_size_t size; |
| 583 |
|
|
|
| 584 |
|
|
size = (png_size_t)length; |
| 585 |
|
|
if ((png_uint_32)size != length) |
| 586 |
|
|
png_error(png_ptr, "Overflow in png_memset_check."); |
| 587 |
|
|
|
| 588 |
|
|
return (png_memset (s1, value, size)); |
| 589 |
|
|
|
| 590 |
|
|
} |
| 591 |
|
|
|
| 592 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 593 |
|
|
/* This function is called when the application wants to use another method |
| 594 |
|
|
* of allocating and freeing memory. |
| 595 |
|
|
*/ |
| 596 |
|
|
void PNGAPI |
| 597 |
|
|
png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr |
| 598 |
|
|
malloc_fn, png_free_ptr free_fn) |
| 599 |
|
|
{ |
| 600 |
|
|
if (png_ptr != NULL) |
| 601 |
|
|
{ |
| 602 |
|
|
png_ptr->mem_ptr = mem_ptr; |
| 603 |
|
|
png_ptr->malloc_fn = malloc_fn; |
| 604 |
|
|
png_ptr->free_fn = free_fn; |
| 605 |
|
|
} |
| 606 |
|
|
} |
| 607 |
|
|
|
| 608 |
|
|
/* This function returns a pointer to the mem_ptr associated with the user |
| 609 |
|
|
* functions. The application should free any memory associated with this |
| 610 |
|
|
* pointer before png_write_destroy and png_read_destroy are called. |
| 611 |
|
|
*/ |
| 612 |
|
|
png_voidp PNGAPI |
| 613 |
|
|
png_get_mem_ptr(png_structp png_ptr) |
| 614 |
|
|
{ |
| 615 |
|
|
if (png_ptr == NULL) |
| 616 |
|
|
return (NULL); |
| 617 |
|
|
return ((png_voidp)png_ptr->mem_ptr); |
| 618 |
|
|
} |
| 619 |
|
|
#endif /* PNG_USER_MEM_SUPPORTED */ |
| 620 |
|
|
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |
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| 
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