/* pngmem.c - stub functions for memory allocation
*
- * libpng 1.2.5rc3 - September 18, 2002
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.2 [May 6, 2010]
+ * Copyright (c) 1998-2010 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
* 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
* identify the replacement functions.
*/
-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#include "pngpriv.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 */
+/* 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_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+ return (png_create_struct_2(type, NULL, NULL));
}
/* Alternate version of png_create_struct, for use with user-defined malloc. */
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
- return (png_get_copyright());
+ return (png_get_copyright(NULL));
#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
+ if (malloc_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
}
else
#endif /* PNG_USER_MEM_SUPPORTED */
- struct_ptr = (png_voidp)farmalloc(size));
+ struct_ptr = (png_voidp)farmalloc(size);
if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
return (struct_ptr);
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);
+ png_destroy_struct_2(struct_ptr, NULL, NULL);
}
/* Free memory allocated by a png_create_struct() call */
if (struct_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
- if(free_fn != NULL)
+ if (free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
* result, we would be truncating potentially larger memory requests
* (which should cause a fatal error) and introducing major problems.
*/
+png_voidp PNGAPI
+png_calloc(png_structp png_ptr, png_alloc_size_t size)
+{
+ png_voidp ret;
+
+ ret = (png_malloc(png_ptr, size));
+ if (ret != NULL)
+ png_memset(ret,0,(png_size_t)size);
+ return (ret);
+}
png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_uint_32 size)
+png_malloc(png_structp png_ptr, png_alloc_size_t size)
{
png_voidp ret;
return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
- if(png_ptr->malloc_fn != NULL)
- {
- ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
- if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of memory!");
- return (ret);
- }
+ if (png_ptr->malloc_fn != NULL)
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
else
- return png_malloc_default(png_ptr, size);
+ 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);
}
png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
+png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
{
png_voidp ret;
#endif /* PNG_USER_MEM_SUPPORTED */
+ if (png_ptr == NULL || size == 0)
+ return (NULL);
+
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
- png_error(png_ptr, "Cannot Allocate > 64K");
+ {
+ png_warning(png_ptr, "Cannot Allocate > 64K");
+ ret = NULL;
+ }
+ else
#endif
- if (size == (png_uint_32)65536L)
+ if (size != (size_t)size)
+ ret = NULL;
+ else 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 */
+ /* Try to see if we need to do any of this fancy stuff */
ret = farmalloc(size);
if (ret == NULL || ((png_size_t)ret & 0xffff))
{
ret = NULL;
}
- if(png_ptr->zlib_window_bits > 14)
+ if (png_ptr->zlib_window_bits > 14)
num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
else
num_blocks = 1;
if (table == NULL)
{
- if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+#ifndef PNG_USER_MEM_SUPPORTED
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
else
- png_warning(png_ptr, "Out Of Memory.");
+ png_warning(png_ptr, "Out Of Memory");
+#endif
return (NULL);
}
if ((png_size_t)table & 0xfff0)
{
- if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+#ifndef PNG_USER_MEM_SUPPORTED
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr,
"Farmalloc didn't return normalized pointer");
else
png_warning(png_ptr,
"Farmalloc didn't return normalized pointer");
+#endif
return (NULL);
}
png_ptr->offset_table = table;
png_ptr->offset_table_ptr = farmalloc(num_blocks *
- sizeof (png_bytep));
+ png_sizeof(png_bytep));
if (png_ptr->offset_table_ptr == NULL)
{
- if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
+#ifndef PNG_USER_MEM_SUPPORTED
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
else
- png_warning(png_ptr, "Out Of memory.");
+ png_warning(png_ptr, "Out Of memory");
+#endif
return (NULL);
}
if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
{
- if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+#ifndef PNG_USER_MEM_SUPPORTED
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
else
- png_warning(png_ptr, "Out of Memory.");
+ png_warning(png_ptr, "Out of Memory");
+#endif
return (NULL);
}
else
ret = farmalloc(size);
+#ifndef PNG_USER_MEM_SUPPORTED
if (ret == NULL)
{
- if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
else
- png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
+ png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
}
+#endif
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. */
+/* 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)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
return;
}
- else png_free_default(png_ptr, ptr);
+ else
+ png_free_default(png_ptr, ptr);
}
void PNGAPI
{
#endif /* PNG_USER_MEM_SUPPORTED */
+ if (png_ptr == NULL || ptr == NULL)
+ return;
+
if (png_ptr->offset_table != NULL)
{
int i;
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+ return (png_create_struct_2(type, NULL, NULL));
}
/* Allocate memory for a png_struct or a png_info. The malloc and
png_voidp struct_ptr;
if (type == PNG_STRUCT_INFO)
- size = sizeof(png_info);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
+ if (malloc_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
+ struct_ptr = (png_voidp)farmalloc(size);
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
- if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL)
+ struct_ptr = (png_voidp)halloc(size, 1);
# else
- if ((struct_ptr = (png_voidp)malloc(size)) != NULL)
+ struct_ptr = (png_voidp)malloc(size);
# endif
#endif
- {
+ if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
- }
return (struct_ptr);
}
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);
+ png_destroy_struct_2(struct_ptr, NULL, NULL);
}
/* Free memory allocated by a png_create_struct() call */
if (struct_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
- if(free_fn != NULL)
+ if (free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
}
/* 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. */
+ * 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_calloc(png_structp png_ptr, png_alloc_size_t size)
{
png_voidp ret;
+ ret = (png_malloc(png_ptr, size));
+ if (ret != NULL)
+ png_memset(ret,0,(png_size_t)size);
+ return (ret);
+}
+
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_alloc_size_t size)
+{
+ png_voidp ret;
+
+#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr == NULL || size == 0)
return (NULL);
-#ifdef PNG_USER_MEM_SUPPORTED
- if(png_ptr->malloc_fn != NULL)
- {
- ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
- if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
- png_error(png_ptr, "Out of Memory!");
- return (ret);
- }
+ if (png_ptr->malloc_fn != NULL)
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
else
- return (png_malloc_default(png_ptr, size));
+ 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);
}
png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
+png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
{
png_voidp ret;
#endif /* PNG_USER_MEM_SUPPORTED */
+ if (png_ptr == NULL || size == 0)
+ return (NULL);
+
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
{
- if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+#ifndef PNG_USER_MEM_SUPPORTED
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Cannot Allocate > 64K");
else
+#endif
return NULL;
}
#endif
+ /* Check for overflow */
#if defined(__TURBOC__) && !defined(__FLAT__)
- ret = farmalloc(size);
+ if (size != (unsigned long)size)
+ ret = NULL;
+ else
+ ret = farmalloc(size);
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
- ret = halloc(size, 1);
+ if (size != (unsigned long)size)
+ ret = NULL;
+ else
+ ret = halloc(size, 1);
# else
- ret = malloc((size_t)size);
+ if (size != (size_t)size)
+ ret = NULL;
+ else
+ ret = malloc((size_t)size);
# endif
#endif
+#ifndef PNG_USER_MEM_SUPPORTED
if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of Memory");
+#endif
return (ret);
}
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
- without taking any action. */
+ * without taking any action.
+ */
void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
return;
}
- else png_free_default(png_ptr, ptr);
+ else
+ png_free_default(png_ptr, ptr);
}
void PNGAPI
png_free_default(png_structp png_ptr, png_voidp ptr)
#endif /* Not Borland DOS special memory handler */
-#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()
- * function will issue a png_warning and return NULL instead of issuing a
- * png_error, if it fails to allocate the requested memory.
+ * 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.
*/
png_voidp PNGAPI
-png_malloc_warn(png_structp png_ptr, png_uint_32 size)
+png_malloc_warn(png_structp png_ptr, png_alloc_size_t size)
{
png_voidp ptr;
- png_uint_32 save_flags=png_ptr->flags;
+ png_uint_32 save_flags;
+ if (png_ptr == NULL)
+ return (NULL);
+ 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);
}
-#endif
-
-png_voidp PNGAPI
-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 PNGAPI
-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
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;
+ if (png_ptr != NULL)
+ {
+ 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
png_voidp PNGAPI
png_get_mem_ptr(png_structp png_ptr)
{
+ if (png_ptr == NULL)
+ return (NULL);
return ((png_voidp)png_ptr->mem_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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