+++ /dev/null
-
-/* pngmem.c - stub functions for memory allocation
- *
- * libpng 1.2.0 - September 1, 2001
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This file provides a location for all memory allocation. Users who
- * need special memory handling are expected to supply replacement
- * functions for png_malloc() and png_free(), and to use
- * png_create_read_struct_2() and png_create_write_struct_2() to
- * identify the replacement functions.
- */
-
-#define PNG_INTERNAL
-#include "png.h"
-
-/* Borland DOS special memory handler */
-#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* if you change this, be sure to change the one in png.h also */
-
-/* Allocate memory for a png_struct. The malloc and memset can be replaced
- by a single call to calloc() if this is thought to improve performance. */
-png_voidp /* PRIVATE */
-png_create_struct(int type)
-{
-#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL, NULL));
-}
-
-/* Alternate version of png_create_struct, for use with user-defined malloc. */
-png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
-{
-#endif /* PNG_USER_MEM_SUPPORTED */
- png_size_t size;
- png_voidp struct_ptr;
-
- if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
- else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
- else
- return ((png_voidp)NULL);
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
- {
- if (mem_ptr != NULL)
- {
- png_struct dummy_struct;
- png_structp png_ptr = &dummy_struct;
- png_ptr->mem_ptr=mem_ptr;
- struct_ptr = (*(malloc_fn))(png_ptr, size);
- }
- else
- struct_ptr = (*(malloc_fn))(NULL, size);
- if (struct_ptr != NULL)
- png_memset(struct_ptr, 0, size);
- return (struct_ptr);
- }
-#endif /* PNG_USER_MEM_SUPPORTED */
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
- {
- png_memset(struct_ptr, 0, size);
- }
- return (struct_ptr);
-}
-
-
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct(png_voidp struct_ptr)
-{
-#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL, (png_voidp)NULL);
-}
-
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
- png_voidp mem_ptr)
-{
-#endif
- if (struct_ptr != NULL)
- {
-#ifdef PNG_USER_MEM_SUPPORTED
- if(free_fn != NULL)
- {
- png_struct dummy_struct;
- png_structp png_ptr = &dummy_struct;
- png_ptr->mem_ptr=mem_ptr;
- (*(free_fn))(png_ptr, struct_ptr);
- return;
- }
-#endif /* PNG_USER_MEM_SUPPORTED */
- farfree (struct_ptr);
- }
-}
-
-/* Allocate memory. For reasonable files, size should never exceed
- * 64K. However, zlib may allocate more then 64K if you don't tell
- * it not to. See zconf.h and png.h for more information. zlib does
- * need to allocate exactly 64K, so whatever you call here must
- * have the ability to do that.
- *
- * Borland seems to have a problem in DOS mode for exactly 64K.
- * It gives you a segment with an offset of 8 (perhaps to store its
- * memory stuff). zlib doesn't like this at all, so we have to
- * detect and deal with it. This code should not be needed in
- * Windows or OS/2 modes, and only in 16 bit mode. This code has
- * been updated by Alexander Lehmann for version 0.89 to waste less
- * memory.
- *
- * Note that we can't use png_size_t for the "size" declaration,
- * since on some systems a png_size_t is a 16-bit quantity, and as a
- * result, we would be truncating potentially larger memory requests
- * (which should cause a fatal error) and introducing major problems.
- */
-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_uint_32 size)
-{
-#ifndef PNG_USER_MEM_SUPPORTED
- png_voidp ret;
-#endif
- if (png_ptr == NULL || size == 0)
- return ((png_voidp)NULL);
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if(png_ptr->malloc_fn != NULL)
- {
- ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
- if (ret == NULL)
- png_error(png_ptr, "Out of memory!");
- return (ret);
- }
- else
- return png_malloc_default(png_ptr, size);
-}
-
-png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
-{
- png_voidp ret;
-#endif /* PNG_USER_MEM_SUPPORTED */
-
-#ifdef PNG_MAX_MALLOC_64K
- if (size > (png_uint_32)65536L)
- png_error(png_ptr, "Cannot Allocate > 64K");
-#endif
-
- if (size == (png_uint_32)65536L)
- {
- if (png_ptr->offset_table == NULL)
- {
- /* try to see if we need to do any of this fancy stuff */
- ret = farmalloc(size);
- if (ret == NULL || ((png_size_t)ret & 0xffff))
- {
- int num_blocks;
- png_uint_32 total_size;
- png_bytep table;
- int i;
- png_byte huge * hptr;
-
- if (ret != NULL)
- {
- farfree(ret);
- ret = NULL;
- }
-
- if(png_ptr->zlib_window_bits > 14)
- num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
- else
- num_blocks = 1;
- if (png_ptr->zlib_mem_level >= 7)
- num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
- else
- num_blocks++;
-
- total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
-
- table = farmalloc(total_size);
-
- if (table == NULL)
- {
- png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
- }
-
- if ((png_size_t)table & 0xfff0)
- {
- png_error(png_ptr, "Farmalloc didn't return normalized pointer");
- }
-
- png_ptr->offset_table = table;
- png_ptr->offset_table_ptr = farmalloc(num_blocks *
- sizeof (png_bytep));
-
- if (png_ptr->offset_table_ptr == NULL)
- {
- png_error(png_ptr, "Out Of memory.");
- }
-
- hptr = (png_byte huge *)table;
- if ((png_size_t)hptr & 0xf)
- {
- hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
- hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
- }
- for (i = 0; i < num_blocks; i++)
- {
- png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
- hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
- }
-
- png_ptr->offset_table_number = num_blocks;
- png_ptr->offset_table_count = 0;
- png_ptr->offset_table_count_free = 0;
- }
- }
-
- if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
- png_error(png_ptr, "Out of Memory.");
-
- ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
- }
- else
- ret = farmalloc(size);
-
- if (ret == NULL)
- {
- png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
- }
-
- return (ret);
-}
-
-/* free a pointer allocated by png_malloc(). In the default
- configuration, png_ptr is not used, but is passed in case it
- is needed. If ptr is NULL, return without taking any action. */
-void PNGAPI
-png_free(png_structp png_ptr, png_voidp ptr)
-{
- if (png_ptr == NULL || ptr == NULL)
- return;
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if (png_ptr->free_fn != NULL)
- {
- (*(png_ptr->free_fn))(png_ptr, ptr);
- return;
- }
- else png_free_default(png_ptr, ptr);
-}
-
-void PNGAPI
-png_free_default(png_structp png_ptr, png_voidp ptr)
-{
-#endif /* PNG_USER_MEM_SUPPORTED */
-
- if (png_ptr->offset_table != NULL)
- {
- int i;
-
- for (i = 0; i < png_ptr->offset_table_count; i++)
- {
- if (ptr == png_ptr->offset_table_ptr[i])
- {
- ptr = NULL;
- png_ptr->offset_table_count_free++;
- break;
- }
- }
- if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
- {
- farfree(png_ptr->offset_table);
- farfree(png_ptr->offset_table_ptr);
- png_ptr->offset_table = NULL;
- png_ptr->offset_table_ptr = NULL;
- }
- }
-
- if (ptr != NULL)
- {
- farfree(ptr);
- }
-}
-
-#else /* Not the Borland DOS special memory handler */
-
-/* Allocate memory for a png_struct or a png_info. The malloc and
- memset can be replaced by a single call to calloc() if this is thought
- to improve performance noticably.*/
-png_voidp /* PRIVATE */
-png_create_struct(int type)
-{
-#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL, NULL));
-}
-
-/* Allocate memory for a png_struct or a png_info. The malloc and
- memset can be replaced by a single call to calloc() if this is thought
- to improve performance noticably.*/
-png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
-{
-#endif /* PNG_USER_MEM_SUPPORTED */
- png_size_t size;
- png_voidp struct_ptr;
-
- if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
- else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
- else
- return ((png_voidp)NULL);
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
- {
- if (mem_ptr != NULL)
- {
- png_struct dummy_struct;
- png_structp png_ptr = &dummy_struct;
- png_ptr->mem_ptr=mem_ptr;
- struct_ptr = (*(malloc_fn))(png_ptr, size);
- }
- else
- struct_ptr = (*(malloc_fn))(NULL, size);
- if (struct_ptr != NULL)
- png_memset(struct_ptr, 0, size);
- return (struct_ptr);
- }
-#endif /* PNG_USER_MEM_SUPPORTED */
-
-#if defined(__TURBOC__) && !defined(__FLAT__)
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
-#else
-# if defined(_MSC_VER) && defined(MAXSEG_64K)
- if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL)
-# else
- if ((struct_ptr = (png_voidp)malloc(size)) != NULL)
-# endif
-#endif
- {
- png_memset(struct_ptr, 0, size);
- }
-
- return (struct_ptr);
-}
-
-
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct(png_voidp struct_ptr)
-{
-#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL, (png_voidp)NULL);
-}
-
-/* Free memory allocated by a png_create_struct() call */
-void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
- png_voidp mem_ptr)
-{
-#endif /* PNG_USER_MEM_SUPPORTED */
- if (struct_ptr != NULL)
- {
-#ifdef PNG_USER_MEM_SUPPORTED
- if(free_fn != NULL)
- {
- png_struct dummy_struct;
- png_structp png_ptr = &dummy_struct;
- png_ptr->mem_ptr=mem_ptr;
- (*(free_fn))(png_ptr, struct_ptr);
- return;
- }
-#endif /* PNG_USER_MEM_SUPPORTED */
-#if defined(__TURBOC__) && !defined(__FLAT__)
- farfree(struct_ptr);
-#else
-# if defined(_MSC_VER) && defined(MAXSEG_64K)
- hfree(struct_ptr);
-# else
- free(struct_ptr);
-# endif
-#endif
- }
-}
-
-
-/* Allocate memory. For reasonable files, size should never exceed
- 64K. However, zlib may allocate more then 64K if you don't tell
- it not to. See zconf.h and png.h for more information. zlib does
- need to allocate exactly 64K, so whatever you call here must
- have the ability to do that. */
-
-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_uint_32 size)
-{
- png_voidp ret;
- if (png_ptr == NULL || size == 0)
- return ((png_voidp)NULL);
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if(png_ptr->malloc_fn != NULL)
- {
- ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
- if (ret == NULL)
- png_error(png_ptr, "Out of Memory!");
- return (ret);
- }
- else
- return (png_malloc_default(png_ptr, size));
-}
-png_voidp /* PRIVATE */
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
-{
- png_voidp ret;
-#endif /* PNG_USER_MEM_SUPPORTED */
-
-#ifdef PNG_MAX_MALLOC_64K
- if (size > (png_uint_32)65536L)
- png_error(png_ptr, "Cannot Allocate > 64K");
-#endif
-
-#if defined(__TURBOC__) && !defined(__FLAT__)
- ret = farmalloc(size);
-#else
-# if defined(_MSC_VER) && defined(MAXSEG_64K)
- ret = halloc(size, 1);
-# else
- ret = malloc((size_t)size);
-# endif
-#endif
-
- if (ret == NULL)
- png_error(png_ptr, "Out of Memory");
-
- return (ret);
-}
-
-/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
- without taking any action. */
-void PNGAPI
-png_free(png_structp png_ptr, png_voidp ptr)
-{
- if (png_ptr == NULL || ptr == NULL)
- return;
-
-#ifdef PNG_USER_MEM_SUPPORTED
- if (png_ptr->free_fn != NULL)
- {
- (*(png_ptr->free_fn))(png_ptr, ptr);
- return;
- }
- else png_free_default(png_ptr, ptr);
-}
-void /* PRIVATE */
-png_free_default(png_structp png_ptr, png_voidp ptr)
-{
- if (png_ptr == NULL || ptr == NULL)
- return;
-
-#endif /* PNG_USER_MEM_SUPPORTED */
-
-#if defined(__TURBOC__) && !defined(__FLAT__)
- farfree(ptr);
-#else
-# if defined(_MSC_VER) && defined(MAXSEG_64K)
- hfree(ptr);
-# else
- free(ptr);
-# endif
-#endif
-}
-
-#endif /* Not Borland DOS special memory handler */
-
-png_voidp /* PRIVATE */
-png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
- png_uint_32 length)
-{
- png_size_t size;
-
- size = (png_size_t)length;
- if ((png_uint_32)size != length)
- png_error(png_ptr,"Overflow in png_memcpy_check.");
-
- return(png_memcpy (s1, s2, size));
-}
-
-png_voidp /* PRIVATE */
-png_memset_check (png_structp png_ptr, png_voidp s1, int value,
- png_uint_32 length)
-{
- png_size_t size;
-
- size = (png_size_t)length;
- if ((png_uint_32)size != length)
- png_error(png_ptr,"Overflow in png_memset_check.");
-
- return (png_memset (s1, value, size));
-
-}
-
-#ifdef PNG_USER_MEM_SUPPORTED
-/* This function is called when the application wants to use another method
- * of allocating and freeing memory.
- */
-void PNGAPI
-png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
- malloc_fn, png_free_ptr free_fn)
-{
- png_ptr->mem_ptr = mem_ptr;
- png_ptr->malloc_fn = malloc_fn;
- png_ptr->free_fn = free_fn;
-}
-
-/* This function returns a pointer to the mem_ptr associated with the user
- * functions. The application should free any memory associated with this
- * pointer before png_write_destroy and png_read_destroy are called.
- */
-png_voidp PNGAPI
-png_get_mem_ptr(png_structp png_ptr)
-{
- return ((png_voidp)png_ptr->mem_ptr);
-}
-#endif /* PNG_USER_MEM_SUPPORTED */
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