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360 lines
9.3 KiB
360 lines
9.3 KiB
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/* pngmem.c - stub functions for memory allocation |
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* |
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* libpng 1.0.1 |
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* For conditions of distribution and use, see copyright notice in png.h |
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
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* Copyright (c) 1996, 1997 Andreas Dilger |
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* Copyright (c) 1998, Glenn Randers-Pehrson |
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* March 9, 1998 |
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* |
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* This file provides a location for all memory allocation. Users which |
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* need special memory handling are expected to modify the code in this file |
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* to meet their needs. See the instructions at each function. |
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*/ |
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#define PNG_INTERNAL |
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#include "png.h" |
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/* The following "hides" PNG_MALLOC and PNG_FREE thus allowing the pngtest |
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application to put a wrapper on top of them. */ |
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#ifdef PNGTEST_MEMORY_DEBUG |
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#define PNG_MALLOC png_debug_malloc |
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#define PNG_FREE png_debug_free |
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#else |
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#define PNG_MALLOC png_malloc |
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#define PNG_FREE png_free |
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#endif |
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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 |
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png_create_struct(int type) |
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{ |
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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 = sizeof(png_info); |
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else if (type == PNG_STRUCT_PNG) |
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size = sizeof(png_struct); |
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else |
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return ((png_voidp)NULL); |
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if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
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{ |
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png_memset(struct_ptr, 0, size); |
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} |
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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 |
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png_destroy_struct(png_voidp struct_ptr) |
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{ |
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if (struct_ptr != NULL) |
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{ |
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farfree (struct_ptr); |
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struct_ptr = NULL; |
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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 it's |
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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 |
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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 ((png_voidp)NULL); |
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#ifdef PNG_MAX_MALLOC_64K |
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if (size > (png_uint_32)65536L) |
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png_error(png_ptr, "Cannot Allocate > 64K"); |
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#endif |
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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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num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); |
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if (num_blocks < 1) |
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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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png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */ |
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} |
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if ((png_size_t)table & 0xfff0) |
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{ |
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png_error(png_ptr, "Farmalloc didn't return normalized pointer"); |
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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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sizeof (png_bytep)); |
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if (png_ptr->offset_table_ptr == NULL) |
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{ |
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png_error(png_ptr, "Out Of memory."); |
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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 += 16L; |
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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 += (png_uint_32)65536L; |
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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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if (png_ptr->offset_table_count >= png_ptr->offset_table_number) |
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png_error(png_ptr, "Out of Memory."); |
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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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if (ret == NULL) |
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{ |
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png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */ |
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} |
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return (ret); |
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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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void |
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PNG_FREE(png_structp png_ptr, png_voidp ptr) |
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{ |
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if (png_ptr == NULL || ptr == NULL) |
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return; |
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if (png_ptr->offset_table != NULL) |
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{ |
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int i; |
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for (i = 0; i < png_ptr->offset_table_count; i++) |
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{ |
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if (ptr == png_ptr->offset_table_ptr[i]) |
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{ |
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ptr = NULL; |
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png_ptr->offset_table_count_free++; |
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break; |
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} |
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} |
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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); |
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farfree(png_ptr->offset_table_ptr); |
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png_ptr->offset_table = NULL; |
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png_ptr->offset_table_ptr = NULL; |
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} |
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} |
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if (ptr != NULL) |
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{ |
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farfree(ptr); |
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ptr = NULL; |
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} |
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} |
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#else /* Not the Borland DOS special memory handler */ |
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/* Allocate memory for a png_struct or a png_info. The malloc and |
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memset can be replaced by a single call to calloc() if this is thought |
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to improve performance noticably.*/ |
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png_voidp |
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png_create_struct(int type) |
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{ |
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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 = sizeof(png_info); |
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else if (type == PNG_STRUCT_PNG) |
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size = sizeof(png_struct); |
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else |
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return ((png_voidp)NULL); |
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#if defined(__TURBOC__) && !defined(__FLAT__) |
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if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
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#else |
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# if defined(_MSC_VER) && defined(MAXSEG_64K) |
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if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL) |
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# else |
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if ((struct_ptr = (png_voidp)malloc(size)) != NULL) |
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# endif |
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#endif |
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{ |
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png_memset(struct_ptr, 0, size); |
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} |
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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 |
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png_destroy_struct(png_voidp struct_ptr) |
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{ |
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if (struct_ptr != NULL) |
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{ |
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#if defined(__TURBOC__) && !defined(__FLAT__) |
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farfree(struct_ptr); |
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#else |
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# if defined(_MSC_VER) && defined(MAXSEG_64K) |
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hfree(struct_ptr); |
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# else |
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free(struct_ptr); |
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# endif |
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#endif |
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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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png_voidp |
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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 ((png_voidp)NULL); |
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#ifdef PNG_MAX_MALLOC_64K |
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if (size > (png_uint_32)65536L) |
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png_error(png_ptr, "Cannot Allocate > 64K"); |
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#endif |
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#if defined(__TURBOC__) && !defined(__FLAT__) |
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ret = farmalloc(size); |
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#else |
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# if defined(_MSC_VER) && defined(MAXSEG_64K) |
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ret = halloc(size, 1); |
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# else |
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ret = malloc((size_t)size); |
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# endif |
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#endif |
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if (ret == NULL) |
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{ |
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png_error(png_ptr, "Out of Memory"); |
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} |
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return (ret); |
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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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void |
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PNG_FREE(png_structp png_ptr, png_voidp ptr) |
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{ |
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if (png_ptr == NULL || ptr == NULL) |
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return; |
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#if defined(__TURBOC__) && !defined(__FLAT__) |
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farfree(ptr); |
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#else |
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# if defined(_MSC_VER) && defined(MAXSEG_64K) |
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hfree(ptr); |
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# else |
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free(ptr); |
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# endif |
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#endif |
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} |
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#endif /* Not Borland DOS special memory handler */ |
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png_voidp |
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png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2, |
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png_uint_32 length) |
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{ |
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png_size_t size; |
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size = (png_size_t)length; |
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if ((png_uint_32)size != length) |
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png_error(png_ptr,"Overflow in png_memcpy_check."); |
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return(png_memcpy (s1, s2, size)); |
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} |
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png_voidp |
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png_memset_check (png_structp png_ptr, png_voidp s1, int value, |
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png_uint_32 length) |
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{ |
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png_size_t size; |
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size = (png_size_t)length; |
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if ((png_uint_32)size != length) |
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png_error(png_ptr,"Overflow in png_memset_check."); |
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return (png_memset (s1, value, size)); |
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}
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