mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
512 lines
13 KiB
C
512 lines
13 KiB
C
|
|
/* pngmem.c - stub functions for memory allocation
|
|
*
|
|
* libpng 1.0.2 - June 14, 1998
|
|
* For conditions of distribution and use, see copyright notice in png.h
|
|
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
|
* Copyright (c) 1996, 1997 Andreas Dilger
|
|
* Copyright (c) 1998, Glenn Randers-Pehrson
|
|
*
|
|
* 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
|
|
png_create_struct(int type)
|
|
{
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
return (png_create_struct_2(type, NULL));
|
|
}
|
|
|
|
/* Alternate version of png_create_struct, for use with user-defined malloc. */
|
|
png_voidp
|
|
png_create_struct_2(int type, png_malloc_ptr malloc_fn)
|
|
{
|
|
#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 ((struct_ptr = (*(malloc_fn))(NULL, size)) != 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
|
|
png_destroy_struct(png_voidp struct_ptr)
|
|
{
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
|
|
}
|
|
|
|
/* Free memory allocated by a png_create_struct() call */
|
|
void
|
|
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
|
|
{
|
|
#endif
|
|
if (struct_ptr != NULL)
|
|
{
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
if(free_fn != NULL)
|
|
{
|
|
png_struct dummy_struct;
|
|
png_structp png_ptr = &dummy_struct;
|
|
(*(free_fn))(png_ptr, struct_ptr);
|
|
struct_ptr = NULL;
|
|
return;
|
|
}
|
|
#endif /* PNG_USER_MEM_SUPPORTED */
|
|
farfree (struct_ptr);
|
|
struct_ptr = NULL;
|
|
}
|
|
}
|
|
|
|
/* 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
|
|
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)
|
|
return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
|
|
else
|
|
return png_malloc_default(png_ptr, size);
|
|
}
|
|
|
|
png_voidp
|
|
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;
|
|
}
|
|
|
|
num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
|
|
if (num_blocks < 1)
|
|
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 += 16L;
|
|
}
|
|
for (i = 0; i < num_blocks; i++)
|
|
{
|
|
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
|
|
hptr += (png_uint_32)65536L;
|
|
}
|
|
|
|
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
|
|
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);
|
|
ptr = NULL;
|
|
return;
|
|
}
|
|
else png_free_default(png_ptr, ptr);
|
|
}
|
|
|
|
void
|
|
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);
|
|
ptr = NULL;
|
|
}
|
|
}
|
|
|
|
#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
|
|
png_create_struct(int type)
|
|
{
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
return (png_create_struct_2(type, 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
|
|
png_create_struct_2(int type, png_malloc_ptr malloc_fn)
|
|
{
|
|
#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 ((struct_ptr = (*(malloc_fn))(NULL, size)) != 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
|
|
png_destroy_struct(png_voidp struct_ptr)
|
|
{
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
|
|
}
|
|
|
|
/* Free memory allocated by a png_create_struct() call */
|
|
void
|
|
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
|
|
{
|
|
#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;
|
|
(*(free_fn))(png_ptr, struct_ptr);
|
|
struct_ptr = NULL;
|
|
return;
|
|
}
|
|
#endif /* PNG_USER_MEM_SUPPORTED */
|
|
#if defined(__TURBOC__) && !defined(__FLAT__)
|
|
farfree(struct_ptr);
|
|
struct_ptr = NULL;
|
|
#else
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
|
hfree(struct_ptr);
|
|
struct_ptr = NULL;
|
|
# else
|
|
free(struct_ptr);
|
|
struct_ptr = NULL;
|
|
# 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
|
|
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)
|
|
return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
|
|
else
|
|
return (png_malloc_default(png_ptr, size));
|
|
}
|
|
png_voidp
|
|
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
|
|
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);
|
|
ptr = NULL;
|
|
return;
|
|
}
|
|
else png_free_default(png_ptr, ptr);
|
|
}
|
|
void
|
|
png_free_default(png_structp png_ptr, png_voidp ptr)
|
|
{
|
|
#endif /* PNG_USER_MEM_SUPPORTED */
|
|
|
|
#if defined(__TURBOC__) && !defined(__FLAT__)
|
|
farfree(ptr);
|
|
ptr = NULL;
|
|
#else
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
|
hfree(ptr);
|
|
ptr = NULL;
|
|
# else
|
|
free(ptr);
|
|
ptr = NULL;
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
#endif /* Not Borland DOS special memory handler */
|
|
|
|
png_voidp
|
|
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
|
|
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
|
|
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
|
|
png_get_mem_ptr(png_structp png_ptr)
|
|
{
|
|
return ((png_voidp)png_ptr->mem_ptr);
|
|
}
|
|
#endif /* PNG_USER_MEM_SUPPORTED */
|