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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (png_ptr == NULL || size == 0) |
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return (NULL); |
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|
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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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|
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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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|
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if (png_ptr == NULL || size == 0) |
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return (NULL); |
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|
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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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|
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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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|
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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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|
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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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|
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total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; |
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|
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table = farmalloc(total_size); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
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|
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if (png_ptr->offset_table_count >= png_ptr->offset_table_number) |
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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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|
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ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; |
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} |
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else |
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ret = farmalloc(size); |
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|
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#ifndef PNG_USER_MEM_SUPPORTED |
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if (ret == NULL) |
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{ |
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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."); /* Note "o" and "m" */ |
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} |
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#endif |
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|
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return (ret); |
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} |
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|
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/* Free a pointer allocated by png_malloc(). In the default |
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* configuration, png_ptr is not used, but is passed in case it |
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* is needed. If ptr is NULL, return without taking any action. |
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*/ |
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void PNGAPI |
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png_free(png_structp png_ptr, png_voidp ptr) |
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{ |
282 |
if (png_ptr == NULL || ptr == NULL) |
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return; |
284 |
|
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#ifdef PNG_USER_MEM_SUPPORTED |
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if (png_ptr->free_fn != NULL) |
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{ |
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(*(png_ptr->free_fn))(png_ptr, ptr); |
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return; |
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} |
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else |
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png_free_default(png_ptr, ptr); |
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} |
294 |
|
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void PNGAPI |
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png_free_default(png_structp png_ptr, png_voidp ptr) |
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{ |
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#endif /* PNG_USER_MEM_SUPPORTED */ |
299 |
|
300 |
if (png_ptr == NULL || ptr == NULL) |
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return; |
302 |
|
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if (png_ptr->offset_table != NULL) |
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{ |
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int i; |
306 |
|
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for (i = 0; i < png_ptr->offset_table_count; i++) |
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{ |
309 |
if (ptr == png_ptr->offset_table_ptr[i]) |
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{ |
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ptr = NULL; |
312 |
png_ptr->offset_table_count_free++; |
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break; |
314 |
} |
315 |
} |
316 |
if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) |
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{ |
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farfree(png_ptr->offset_table); |
319 |
farfree(png_ptr->offset_table_ptr); |
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png_ptr->offset_table = NULL; |
321 |
png_ptr->offset_table_ptr = NULL; |
322 |
} |
323 |
} |
324 |
|
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if (ptr != NULL) |
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{ |
327 |
farfree(ptr); |
328 |
} |
329 |
} |
330 |
|
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#else /* Not the Borland DOS special memory handler */ |
332 |
|
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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 |
to improve performance noticably. */ |
336 |
png_voidp /* PRIVATE */ |
337 |
png_create_struct(int type) |
338 |
{ |
339 |
#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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} |
342 |
|
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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 |
to improve performance noticably. */ |
346 |
png_voidp /* PRIVATE */ |
347 |
png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr) |
348 |
{ |
349 |
#endif /* PNG_USER_MEM_SUPPORTED */ |
350 |
png_size_t size; |
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png_voidp struct_ptr; |
352 |
|
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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); |
357 |
else |
358 |
return (NULL); |
359 |
|
360 |
#ifdef PNG_USER_MEM_SUPPORTED |
361 |
if (malloc_fn != NULL) |
362 |
{ |
363 |
png_struct dummy_struct; |
364 |
png_structp png_ptr = &dummy_struct; |
365 |
png_ptr->mem_ptr=mem_ptr; |
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struct_ptr = (*(malloc_fn))(png_ptr, size); |
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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 */ |