/* pngmem.c - stub functions for memory allocation
*
- * libpng 1.0.3 - January 14, 1999
- * 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, 1999 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
* 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_voidp
+png_voidp /* PRIVATE */
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL));
+ return (png_create_struct_2(type, NULL, 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)
+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);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
- return ((png_voidp)NULL);
+ return (png_get_copyright(NULL));
#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
+ if (malloc_fn != NULL)
{
- if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
- png_memset(struct_ptr, 0, size);
- return (struct_ptr);
+ png_struct dummy_struct;
+ png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
+ struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
}
+ else
#endif /* PNG_USER_MEM_SUPPORTED */
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
- {
+ struct_ptr = (png_voidp)farmalloc(size);
+ if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
- }
return (struct_ptr);
}
-
/* Free memory allocated by a png_create_struct() call */
-void
+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_destroy_struct_2(struct_ptr, NULL, NULL);
}
/* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+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)
+ 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);
- struct_ptr = NULL;
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
farfree (struct_ptr);
- struct_ptr = NULL;
}
}
* 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)
+png_voidp PNGAPI
+png_calloc(png_structp png_ptr, png_alloc_size_t size)
{
-#ifndef PNG_USER_MEM_SUPPORTED
png_voidp ret;
-#endif
+
+ 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;
+
if (png_ptr == NULL || size == 0)
- return ((png_voidp)NULL);
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
- if(png_ptr->malloc_fn != NULL)
- return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+ 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
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
+png_voidp PNGAPI
+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;
}
- num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
- if (num_blocks < 1)
+ 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));
if (table == NULL)
{
- 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");
+#endif
+ return (NULL);
}
if ((png_size_t)table & 0xfff0)
{
- png_error(png_ptr, "Farmalloc didn't return normalized pointer");
+#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)
{
- png_error(png_ptr, "Out Of memory.");
+#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");
+#endif
+ return (NULL);
}
hptr = (png_byte huge *)table;
if ((png_size_t)hptr & 0xf)
{
hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
- hptr += 16L;
+ 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 += (png_uint_32)65536L;
+ hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
}
png_ptr->offset_table_number = num_blocks;
}
if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
- png_error(png_ptr, "Out of Memory.");
+ {
+#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");
+#endif
+ return (NULL);
+ }
ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
}
else
ret = farmalloc(size);
+#ifndef PNG_USER_MEM_SUPPORTED
if (ret == NULL)
{
- 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" */
}
+#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. */
-void
+/* 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)
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
- ptr = NULL;
return;
}
- else png_free_default(png_ptr, ptr);
+ else
+ png_free_default(png_ptr, ptr);
}
-void
+void PNGAPI
png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
+ if (png_ptr == NULL || ptr == NULL)
+ return;
+
if (png_ptr->offset_table != NULL)
{
int i;
if (ptr != NULL)
{
farfree(ptr);
- ptr = 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
+ to improve performance noticably. */
+png_voidp /* PRIVATE */
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL));
+ 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
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+ 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);
+ size = png_sizeof(png_info);
else if (type == PNG_STRUCT_PNG)
- size = sizeof(png_struct);
+ size = png_sizeof(png_struct);
else
- return ((png_voidp)NULL);
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
- if(malloc_fn != NULL)
+ if (malloc_fn != NULL)
{
- if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
+ png_struct dummy_struct;
+ png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
+ struct_ptr = (*(malloc_fn))(png_ptr, 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)
+ 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);
}
/* Free memory allocated by a png_create_struct() call */
-void
+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_destroy_struct_2(struct_ptr, NULL, NULL);
}
/* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+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)
+ 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);
- 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. */
+ * 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)
+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_alloc_size_t 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));
+ if (png_ptr == NULL || size == 0)
+ return (NULL);
+
+ 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
-png_malloc_default(png_structp png_ptr, png_uint_32 size)
+
+png_voidp PNGAPI
+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");
+ {
+#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
- if (ret == NULL)
- {
+#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. */
-void
+ * without taking any action.
+ */
+void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
- ptr = NULL;
return;
}
- else png_free_default(png_ptr, ptr);
+ else
+ png_free_default(png_ptr, ptr);
}
-void
+void PNGAPI
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);
- 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)
+/* This function was added at libpng version 1.2.3. The png_malloc_warn()
+ * 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_alloc_size_t size)
{
- 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 ptr;
+ 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);
}
-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
+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;
+ 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
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
-png_voidp
+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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