This repository has been archived on 2023-11-11. You can view files and clone it, but cannot push or open issues or pull requests.
libpng/pngmem.c

599 lines
16 KiB
C
Raw Normal View History

1998-03-07 12:06:55 +00:00
1995-11-28 17:22:13 +00:00
/* pngmem.c - stub functions for memory allocation
1998-01-01 13:13:13 +00:00
*
2006-03-07 13:09:22 +00:00
* Last changed in libpng 1.2.9 March 7, 2006
1998-01-01 13:13:13 +00:00
* For conditions of distribution and use, see copyright notice in png.h
2006-02-21 04:09:05 +00:00
* Copyright (c) 1998-2006 Glenn Randers-Pehrson
2000-06-04 19:29:29 +00:00
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
1998-01-01 13:13:13 +00:00
*
1998-04-21 20:03:57 +00:00
* This file provides a location for all memory allocation. Users who
1998-06-14 19:43:31 +00:00
* 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.
1998-01-01 13:13:13 +00:00
*/
1995-07-20 07:43:20 +00:00
#define PNG_INTERNAL
#include "png.h"
2006-02-21 04:09:05 +00:00
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
1996-01-16 07:51:56 +00:00
/* 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 */
1996-06-05 20:50:50 +00:00
/* Allocate memory for a png_struct. The malloc and memset can be replaced
1997-01-17 07:34:35 +00:00
by a single call to calloc() if this is thought to improve performance. */
2000-05-06 19:09:57 +00:00
png_voidp /* PRIVATE */
1997-01-17 07:34:35 +00:00
png_create_struct(int type)
1996-06-05 20:50:50 +00:00
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-10-27 12:35:13 +00:00
return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
1998-06-06 20:31:35 +00:00
}
/* Alternate version of png_create_struct, for use with user-defined malloc. */
2000-05-06 19:09:57 +00:00
png_voidp /* PRIVATE */
2001-05-18 09:54:50 +00:00
png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
1998-06-06 20:31:35 +00:00
{
#endif /* PNG_USER_MEM_SUPPORTED */
1997-01-17 07:34:35 +00:00
png_size_t size;
1996-06-05 20:50:50 +00:00
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
2004-07-28 13:20:44 +00:00
size = png_sizeof(png_info);
1996-06-05 20:50:50 +00:00
else if (type == PNG_STRUCT_PNG)
2004-07-28 13:20:44 +00:00
size = png_sizeof(png_struct);
1996-06-05 20:50:50 +00:00
else
2004-07-18 03:45:44 +00:00
return (png_get_copyright(NULL));
1996-06-05 20:50:50 +00:00
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
2001-10-27 12:35:13 +00:00
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
png_ptr->mem_ptr=mem_ptr;
2001-11-07 13:10:08 +00:00
struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
1998-06-06 20:31:35 +00:00
}
2001-10-27 12:35:13 +00:00
else
1998-06-06 20:31:35 +00:00
#endif /* PNG_USER_MEM_SUPPORTED */
2004-07-18 03:45:44 +00:00
struct_ptr = (png_voidp)farmalloc(size);
2001-10-27 12:35:13 +00:00
if (struct_ptr != NULL)
1996-06-05 20:50:50 +00:00
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
/* Free memory allocated by a png_create_struct() call */
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
1996-06-05 20:50:50 +00:00
png_destroy_struct(png_voidp struct_ptr)
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-10-27 12:35:13 +00:00
png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
1998-06-06 20:31:35 +00:00
}
/* Free memory allocated by a png_create_struct() call */
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
2001-05-18 09:54:50 +00:00
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
png_voidp mem_ptr)
1998-06-06 20:31:35 +00:00
{
#endif
1997-05-16 07:46:07 +00:00
if (struct_ptr != NULL)
1998-01-31 03:45:12 +00:00
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if(free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
2001-05-18 09:54:50 +00:00
png_ptr->mem_ptr=mem_ptr;
1998-06-06 20:31:35 +00:00
(*(free_fn))(png_ptr, struct_ptr);
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
1996-06-05 20:50:50 +00:00
farfree (struct_ptr);
1998-01-31 03:45:12 +00:00
}
1996-06-05 20:50:50 +00:00
}
1995-07-20 07:43:20 +00:00
/* Allocate memory. For reasonable files, size should never exceed
1997-05-16 07:46:07 +00:00
* 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.
1998-05-21 14:27:50 +00:00
* It gives you a segment with an offset of 8 (perhaps to store its
1997-05-16 07:46:07 +00:00
* 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.
*/
2002-05-25 16:12:10 +00:00
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1998-06-06 20:31:35 +00:00
png_malloc(png_structp png_ptr, png_uint_32 size)
1995-07-20 07:43:20 +00:00
{
1996-01-26 07:38:47 +00:00
png_voidp ret;
2002-05-25 16:12:10 +00:00
1997-05-16 07:46:07 +00:00
if (png_ptr == NULL || size == 0)
2001-10-27 12:35:13 +00:00
return (NULL);
1995-07-20 07:43:20 +00:00
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
2001-11-24 20:53:31 +00:00
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
1998-06-06 20:31:35 +00:00
else
2004-07-28 13:20:44 +00:00
ret = (png_malloc_default(png_ptr, size));
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of memory!");
return (ret);
1998-06-06 20:31:35 +00:00
}
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1998-06-06 20:31:35 +00:00
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
1998-12-29 17:47:59 +00:00
#endif /* PNG_USER_MEM_SUPPORTED */
1998-06-06 20:31:35 +00:00
1995-07-20 07:43:20 +00:00
#ifdef PNG_MAX_MALLOC_64K
1996-01-26 07:38:47 +00:00
if (size > (png_uint_32)65536L)
2004-07-28 13:20:44 +00:00
{
png_warning(png_ptr, "Cannot Allocate > 64K");
ret = NULL;
}
else
1996-01-16 07:51:56 +00:00
#endif
2004-07-28 13:20:44 +00:00
if (size != (size_t)size)
ret = NULL;
else if (size == (png_uint_32)65536L)
1996-01-26 07:38:47 +00:00
{
1997-05-16 07:46:07 +00:00
if (png_ptr->offset_table == NULL)
1996-01-26 07:38:47 +00:00
{
/* try to see if we need to do any of this fancy stuff */
ret = farmalloc(size);
1997-05-16 07:46:07 +00:00
if (ret == NULL || ((png_size_t)ret & 0xffff))
1996-01-26 07:38:47 +00:00
{
int num_blocks;
png_uint_32 total_size;
png_bytep table;
int i;
1996-01-16 07:51:56 +00:00
png_byte huge * hptr;
1997-05-16 07:46:07 +00:00
if (ret != NULL)
1998-01-31 03:45:12 +00:00
{
1996-01-26 07:38:47 +00:00
farfree(ret);
1998-01-31 03:45:12 +00:00
ret = NULL;
}
1996-01-26 07:38:47 +00:00
1999-09-17 17:27:26 +00:00
if(png_ptr->zlib_window_bits > 14)
num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
else
1996-01-26 07:38:47 +00:00
num_blocks = 1;
if (png_ptr->zlib_mem_level >= 7)
num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
else
num_blocks++;
1996-06-05 20:50:50 +00:00
total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
1996-01-26 07:38:47 +00:00
table = farmalloc(total_size);
1997-05-16 07:46:07 +00:00
if (table == NULL)
1996-01-26 07:38:47 +00:00
{
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2004-07-18 03:45:44 +00:00
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
2002-02-22 05:14:23 +00:00
png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
else
png_warning(png_ptr, "Out Of Memory.");
2004-07-28 13:20:44 +00:00
#endif
2002-02-22 05:14:23 +00:00
return (NULL);
1996-01-26 07:38:47 +00:00
}
1997-05-16 07:46:07 +00:00
if ((png_size_t)table & 0xfff0)
1996-01-26 07:38:47 +00:00
{
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2004-07-18 03:45:44 +00:00
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
2002-02-22 05:14:23 +00:00
png_error(png_ptr,
"Farmalloc didn't return normalized pointer");
else
png_warning(png_ptr,
"Farmalloc didn't return normalized pointer");
2004-07-28 13:20:44 +00:00
#endif
2002-02-22 05:14:23 +00:00
return (NULL);
1996-01-26 07:38:47 +00:00
}
1996-06-05 20:50:50 +00:00
png_ptr->offset_table = table;
1997-05-16 07:46:07 +00:00
png_ptr->offset_table_ptr = farmalloc(num_blocks *
2004-07-28 13:20:44 +00:00
png_sizeof (png_bytep));
1996-01-26 07:38:47 +00:00
1997-05-16 07:46:07 +00:00
if (png_ptr->offset_table_ptr == NULL)
1996-01-26 07:38:47 +00:00
{
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2004-07-18 03:45:44 +00:00
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
2002-02-22 05:14:23 +00:00
png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
else
png_warning(png_ptr, "Out Of memory.");
2004-07-28 13:20:44 +00:00
#endif
2002-02-22 05:14:23 +00:00
return (NULL);
1996-01-26 07:38:47 +00:00
}
hptr = (png_byte huge *)table;
1997-05-16 07:46:07 +00:00
if ((png_size_t)hptr & 0xf)
1996-01-26 07:38:47 +00:00
{
1996-06-05 20:50:50 +00:00
hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
1999-09-17 17:27:26 +00:00
hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
1996-01-26 07:38:47 +00:00
}
for (i = 0; i < num_blocks; i++)
{
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
1999-09-17 17:27:26 +00:00
hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
1996-01-26 07:38:47 +00:00
}
png_ptr->offset_table_number = num_blocks;
png_ptr->offset_table_count = 0;
png_ptr->offset_table_count_free = 0;
}
1996-06-05 20:50:50 +00:00
}
1996-01-26 07:38:47 +00:00
1996-06-05 20:50:50 +00:00
if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
2002-02-22 05:14:23 +00:00
{
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2004-07-18 03:45:44 +00:00
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
2002-02-22 05:14:23 +00:00
png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
else
png_warning(png_ptr, "Out of Memory.");
2004-07-28 13:20:44 +00:00
#endif
2002-02-22 05:14:23 +00:00
return (NULL);
}
1996-01-16 07:51:56 +00:00
1996-06-05 20:50:50 +00:00
ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
1996-01-26 07:38:47 +00:00
}
else
ret = farmalloc(size);
1996-01-16 07:51:56 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
1996-01-26 07:38:47 +00:00
if (ret == NULL)
{
2004-07-18 03:45:44 +00:00
if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
2002-02-22 05:14:23 +00:00
png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
else
png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
1996-01-26 07:38:47 +00:00
}
2004-07-28 13:20:44 +00:00
#endif
1996-01-16 07:51:56 +00:00
1998-02-01 02:07:59 +00:00
return (ret);
1996-01-16 07:51:56 +00:00
}
1998-06-06 20:31:35 +00:00
/* free a pointer allocated by png_malloc(). In the default
1997-01-17 07:34:35 +00:00
configuration, png_ptr is not used, but is passed in case it
is needed. If ptr is NULL, return without taking any action. */
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-06-06 20:31:35 +00:00
png_free(png_structp png_ptr, png_voidp ptr)
1996-01-16 07:51:56 +00:00
{
1997-05-16 07:46:07 +00:00
if (png_ptr == NULL || ptr == NULL)
1996-01-26 07:38:47 +00:00
return;
1998-06-06 20:31:35 +00:00
#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);
}
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-06-06 20:31:35 +00:00
png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
1998-12-29 17:47:59 +00:00
1997-05-16 07:46:07 +00:00
if (png_ptr->offset_table != NULL)
1996-01-26 07:38:47 +00:00
{
1997-05-16 07:46:07 +00:00
int i;
1996-01-26 07:38:47 +00:00
1997-05-16 07:46:07 +00:00
for (i = 0; i < png_ptr->offset_table_count; i++)
{
if (ptr == png_ptr->offset_table_ptr[i])
1996-01-26 07:38:47 +00:00
{
1997-05-16 07:46:07 +00:00
ptr = NULL;
png_ptr->offset_table_count_free++;
break;
1996-01-16 07:51:56 +00:00
}
1996-01-26 07:38:47 +00:00
}
1997-05-16 07:46:07 +00:00
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;
}
1996-01-26 07:38:47 +00:00
}
1997-05-16 07:46:07 +00:00
if (ptr != NULL)
1998-01-31 03:45:12 +00:00
{
1997-05-16 07:46:07 +00:00
farfree(ptr);
1998-01-31 03:45:12 +00:00
}
1996-01-16 07:51:56 +00:00
}
#else /* Not the Borland DOS special memory handler */
1996-06-05 20:50:50 +00:00
/* Allocate memory for a png_struct or a png_info. The malloc and
1997-01-17 07:34:35 +00:00
memset can be replaced by a single call to calloc() if this is thought
2002-06-20 11:54:34 +00:00
to improve performance noticably. */
2000-05-06 19:09:57 +00:00
png_voidp /* PRIVATE */
1997-01-17 07:34:35 +00:00
png_create_struct(int type)
1996-06-05 20:50:50 +00:00
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-10-27 12:35:13 +00:00
return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
1998-06-06 20:31:35 +00:00
}
/* 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
2002-06-20 11:54:34 +00:00
to improve performance noticably. */
2000-05-06 19:09:57 +00:00
png_voidp /* PRIVATE */
2001-05-18 09:54:50 +00:00
png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
1998-06-06 20:31:35 +00:00
{
#endif /* PNG_USER_MEM_SUPPORTED */
1997-05-16 07:46:07 +00:00
png_size_t size;
1996-06-05 20:50:50 +00:00
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
2004-07-28 13:20:44 +00:00
size = png_sizeof(png_info);
1996-06-05 20:50:50 +00:00
else if (type == PNG_STRUCT_PNG)
2004-07-28 13:20:44 +00:00
size = png_sizeof(png_struct);
1996-06-05 20:50:50 +00:00
else
2001-10-27 12:35:13 +00:00
return (NULL);
1996-06-05 20:50:50 +00:00
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
2001-11-07 13:10:08 +00:00
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
png_ptr->mem_ptr=mem_ptr;
2001-11-24 20:53:31 +00:00
struct_ptr = (*(malloc_fn))(png_ptr, size);
2001-05-18 09:54:50 +00:00
if (struct_ptr != NULL)
1998-06-06 20:31:35 +00:00
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
1996-06-05 20:50:50 +00:00
#if defined(__TURBOC__) && !defined(__FLAT__)
2004-07-28 13:20:44 +00:00
struct_ptr = (png_voidp)farmalloc(size);
1996-06-05 20:50:50 +00:00
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
2004-07-28 13:20:44 +00:00
struct_ptr = (png_voidp)halloc(size,1);
1996-06-05 20:50:50 +00:00
# else
2004-07-28 13:20:44 +00:00
struct_ptr = (png_voidp)malloc(size);
1996-06-05 20:50:50 +00:00
# endif
#endif
2004-07-28 13:20:44 +00:00
if (struct_ptr != NULL)
1996-06-05 20:50:50 +00:00
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
/* Free memory allocated by a png_create_struct() call */
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
1996-06-05 20:50:50 +00:00
png_destroy_struct(png_voidp struct_ptr)
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-10-27 12:35:13 +00:00
png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
1998-06-06 20:31:35 +00:00
}
/* Free memory allocated by a png_create_struct() call */
2000-05-06 19:09:57 +00:00
void /* PRIVATE */
2001-05-18 09:54:50 +00:00
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
png_voidp mem_ptr)
1998-06-06 20:31:35 +00:00
{
#endif /* PNG_USER_MEM_SUPPORTED */
1997-05-16 07:46:07 +00:00
if (struct_ptr != NULL)
1998-01-31 03:45:12 +00:00
{
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if(free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
2001-05-18 09:54:50 +00:00
png_ptr->mem_ptr=mem_ptr;
1998-06-06 20:31:35 +00:00
(*(free_fn))(png_ptr, struct_ptr);
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
1996-06-05 20:50:50 +00:00
#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
1998-01-31 03:45:12 +00:00
}
1996-06-05 20:50:50 +00:00
}
1996-01-16 07:51:56 +00:00
/* Allocate memory. For reasonable files, size should never exceed
1996-01-26 07:38:47 +00:00
64K. However, zlib may allocate more then 64K if you don't tell
1997-05-16 07:46:07 +00:00
it not to. See zconf.h and png.h for more information. zlib does
1996-01-26 07:38:47 +00:00
need to allocate exactly 64K, so whatever you call here must
have the ability to do that. */
1996-01-16 07:51:56 +00:00
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1998-06-06 20:31:35 +00:00
png_malloc(png_structp png_ptr, png_uint_32 size)
1996-01-16 07:51:56 +00:00
{
1996-01-26 07:38:47 +00:00
png_voidp ret;
2002-05-25 16:12:10 +00:00
2004-08-04 11:34:52 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
1997-05-16 07:46:07 +00:00
if (png_ptr == NULL || size == 0)
2001-10-27 12:35:13 +00:00
return (NULL);
1996-01-16 07:51:56 +00:00
1998-06-06 20:31:35 +00:00
if(png_ptr->malloc_fn != NULL)
2002-05-25 16:12:10 +00:00
ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
1998-06-06 20:31:35 +00:00
else
2004-07-28 13:20:44 +00:00
ret = (png_malloc_default(png_ptr, size));
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of Memory!");
return (ret);
1998-06-06 20:31:35 +00:00
}
2002-05-25 16:12:10 +00:00
2002-03-26 00:49:08 +00:00
png_voidp PNGAPI
1998-06-06 20:31:35 +00:00
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
#endif /* PNG_USER_MEM_SUPPORTED */
2004-08-04 11:34:52 +00:00
if (png_ptr == NULL || size == 0)
return (NULL);
1996-01-16 07:51:56 +00:00
#ifdef PNG_MAX_MALLOC_64K
1998-02-09 02:56:40 +00:00
if (size > (png_uint_32)65536L)
2002-02-22 05:14:23 +00:00
{
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2002-02-22 05:14:23 +00:00
if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Cannot Allocate > 64K");
else
2004-07-28 13:20:44 +00:00
#endif
2002-02-22 05:14:23 +00:00
return NULL;
}
1995-07-20 07:43:20 +00:00
#endif
2004-07-28 13:20:44 +00:00
/* Check for overflow */
1995-12-19 09:22:19 +00:00
#if defined(__TURBOC__) && !defined(__FLAT__)
2004-07-28 13:20:44 +00:00
if (size != (unsigned long)size)
ret = NULL;
else
1998-02-09 02:56:40 +00:00
ret = farmalloc(size);
1995-12-19 09:22:19 +00:00
#else
1996-01-16 07:51:56 +00:00
# if defined(_MSC_VER) && defined(MAXSEG_64K)
2004-07-28 13:20:44 +00:00
if (size != (unsigned long)size)
ret = NULL;
else
1998-02-09 02:56:40 +00:00
ret = halloc(size, 1);
1996-01-16 07:51:56 +00:00
# else
2004-07-28 13:20:44 +00:00
if (size != (size_t)size)
ret = NULL;
else
1998-02-28 13:00:24 +00:00
ret = malloc((size_t)size);
1996-01-16 07:51:56 +00:00
# endif
1995-07-20 07:43:20 +00:00
#endif
2004-07-28 13:20:44 +00:00
#ifndef PNG_USER_MEM_SUPPORTED
2002-02-22 05:14:23 +00:00
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
1995-12-19 09:22:19 +00:00
png_error(png_ptr, "Out of Memory");
2004-07-28 13:20:44 +00:00
#endif
1995-07-20 07:43:20 +00:00
1998-02-01 02:07:59 +00:00
return (ret);
1995-07-20 07:43:20 +00:00
}
1998-06-06 20:31:35 +00:00
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
without taking any action. */
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-06-06 20:31:35 +00:00
png_free(png_structp png_ptr, png_voidp ptr)
1995-07-20 07:43:20 +00:00
{
1997-05-16 07:46:07 +00:00
if (png_ptr == NULL || ptr == NULL)
1996-01-26 07:38:47 +00:00
return;
1995-07-20 07:43:20 +00:00
1998-06-06 20:31:35 +00:00
#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);
}
2002-03-26 00:49:08 +00:00
void PNGAPI
1998-06-06 20:31:35 +00:00
png_free_default(png_structp png_ptr, png_voidp ptr)
{
1999-10-23 13:39:18 +00:00
if (png_ptr == NULL || ptr == NULL)
return;
1998-06-06 20:31:35 +00:00
#endif /* PNG_USER_MEM_SUPPORTED */
1995-12-19 09:22:19 +00:00
#if defined(__TURBOC__) && !defined(__FLAT__)
1997-05-16 07:46:07 +00:00
farfree(ptr);
1995-07-20 07:43:20 +00:00
#else
1996-01-16 07:51:56 +00:00
# if defined(_MSC_VER) && defined(MAXSEG_64K)
1997-05-16 07:46:07 +00:00
hfree(ptr);
1996-01-16 07:51:56 +00:00
# else
1997-05-16 07:46:07 +00:00
free(ptr);
1996-01-16 07:51:56 +00:00
# endif
1995-07-20 07:43:20 +00:00
#endif
}
1996-01-16 07:51:56 +00:00
#endif /* Not Borland DOS special memory handler */
1995-12-19 09:22:19 +00:00
2002-07-02 03:23:46 +00:00
#if defined(PNG_1_0_X)
# define png_malloc_warn png_malloc
#else
/* This function was added at libpng version 1.2.3. The png_malloc_warn()
2004-07-28 13:20:44 +00:00
* function will set up png_malloc() to issue a png_warning and return NULL
* instead of issuing a png_error, if it fails to allocate the requested
* memory.
2002-05-25 16:12:10 +00:00
*/
png_voidp PNGAPI
png_malloc_warn(png_structp png_ptr, png_uint_32 size)
{
png_voidp ptr;
png_uint_32 save_flags=png_ptr->flags;
png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
png_ptr->flags=save_flags;
return(ptr);
}
2002-07-02 03:23:46 +00:00
#endif
2002-05-25 16:12:10 +00:00
2002-03-26 00:49:08 +00:00
png_voidp PNGAPI
1998-02-09 02:56:40 +00:00
png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
1998-02-07 16:20:57 +00:00
png_uint_32 length)
{
png_size_t size;
1998-02-09 02:56:40 +00:00
size = (png_size_t)length;
if ((png_uint_32)size != length)
png_error(png_ptr,"Overflow in png_memcpy_check.");
1998-12-29 17:47:59 +00:00
1998-02-09 02:56:40 +00:00
return(png_memcpy (s1, s2, size));
1998-02-07 16:20:57 +00:00
}
2002-03-26 00:49:08 +00:00
png_voidp PNGAPI
1998-02-09 02:56:40 +00:00
png_memset_check (png_structp png_ptr, png_voidp s1, int value,
1998-02-07 16:20:57 +00:00
png_uint_32 length)
{
png_size_t size;
1998-02-09 02:56:40 +00:00
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));
1998-02-07 16:20:57 +00:00
}
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
/* This function is called when the application wants to use another method
* of allocating and freeing memory.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-06-06 20:31:35 +00:00
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.
*/
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1998-06-06 20:31:35 +00:00
png_get_mem_ptr(png_structp png_ptr)
{
return ((png_voidp)png_ptr->mem_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
2006-02-21 04:09:05 +00:00
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */