/* pngmem.c - stub functions for memory allocation
*
- * Last changed in libpng 1.6.8 [December 19, 2013]
- * Copyright (c) 1998-2013 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.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * 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
}
/* Allocate memory. For reasonable files, size should never exceed
- * 64K. However, zlib may allocate more then 64K if you don't tell
+ * 64K. However, zlib may allocate more than 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_FUNCTION(png_voidp /* PRIVATE */,
png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED)
+ PNG_ALLOCATED)
{
/* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS
* allocators have also been removed in 1.6.0, so any 16-bit system now has
PNG_UNUSED(png_ptr)
#endif
+ /* Some compilers complain that this is always true. However, it
+ * can be false when integer overflow happens.
+ */
if (size > 0 && size <= PNG_SIZE_MAX
# ifdef PNG_MAX_MALLOC_64K
&& size <= 65536U
*/
static png_voidp
png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
- size_t element_size)
+ size_t element_size)
{
- png_alloc_size_t req = nelements; /* known to be > 0 */
+ png_alloc_size_t req = (png_alloc_size_t)nelements; /* known to be > 0 */
if (req <= PNG_SIZE_MAX/element_size)
return png_malloc_base(png_ptr, req * element_size);
PNG_FUNCTION(png_voidp /* PRIVATE */,
png_malloc_array,(png_const_structrp png_ptr, int nelements,
- size_t element_size),PNG_ALLOCATED)
+ size_t element_size),PNG_ALLOCATED)
{
if (nelements <= 0 || element_size == 0)
png_error(png_ptr, "internal error: array alloc");
PNG_FUNCTION(png_voidp /* PRIVATE */,
png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array,
- int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
+ int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
{
/* These are internal errors: */
if (add_elements <= 0 || element_size == 0 || old_elements < 0 ||
if (add_elements <= INT_MAX - old_elements)
{
png_voidp new_array = png_malloc_array_checked(png_ptr,
- old_elements+add_elements, element_size);
+ old_elements+add_elements, element_size);
if (new_array != NULL)
{
memcpy(new_array, old_array, element_size*(unsigned)old_elements);
memset((char*)new_array + element_size*(unsigned)old_elements, 0,
- element_size*(unsigned)add_elements);
+ element_size*(unsigned)add_elements);
return new_array;
}
#ifdef PNG_USER_MEM_SUPPORTED
PNG_FUNCTION(png_voidp,PNGAPI
png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED PNG_DEPRECATED)
+ PNG_ALLOCATED PNG_DEPRECATED)
{
png_voidp ret;
return ret;
}
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* USER_MEM */
/* 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_FUNCTION(png_voidp,PNGAPI
png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED)
+ PNG_ALLOCATED)
{
if (png_ptr != NULL)
{
{
if (png_ptr == NULL || ptr == NULL)
return;
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* USER_MEM */
free(ptr);
}
return png_ptr->mem_ptr;
}
-#endif /* PNG_USER_MEM_SUPPORTED */
-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
+#endif /* USER_MEM */
+#endif /* READ || WRITE */