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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "vp8_mem.h"
void *vpx_memalign(size_t align, size_t size)
{
void *addr = malloc(size + align - 1 + ADDRESS_STORAGE_SIZE);
void *x = NULL;
if (addr)
{
x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, (int)align);
// save the actual malloc address
((size_t *)x)[-1] = (size_t)addr;
}
return x;
}
void *vpx_malloc(size_t size)
{
return vpx_memalign(DEFAULT_ALIGNMENT, size);
}
void *vpx_calloc(size_t num, size_t size)
{
void *x = vpx_memalign(DEFAULT_ALIGNMENT, num * size);
if (x)
memset(x, 0, num * size);
return x;
}
/**
* \note The realloc() function changes the size of the object pointed to by
* ptr to the size specified by size, and returns a pointer to the
* possibly moved block. The contents are unchanged up to the lesser
* of the new and old sizes. If ptr is null, realloc() behaves like
* malloc() for the specified size. If size is zero (0) and ptr is
* not a null pointer, the object pointed to is freed.
*/
void *vpx_realloc(void *memblk, size_t size)
{
void *addr, *new_addr = NULL;
int align = DEFAULT_ALIGNMENT;
if (!memblk)
new_addr = vpx_malloc(size);
else if (!size)
vpx_free(memblk);
else
{
addr = (void *)(((size_t *)memblk)[-1]);
memblk = NULL;
new_addr = realloc(addr, size + align + ADDRESS_STORAGE_SIZE);
if (new_addr)
{
addr = new_addr;
new_addr = (void *)(((size_t)((unsigned char *)new_addr + ADDRESS_STORAGE_SIZE) + (align - 1)) & (size_t) - align);
// save the actual malloc address
((size_t *)new_addr)[-1] = (size_t)addr;
}
}
return new_addr;
}
void vpx_free(void *memblk)
{
if (memblk)
{
void *addr = (void *)(((size_t *)memblk)[-1]);
free(addr);
}
}
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