/*
 * default memory allocator for libavutil
 * Copyright (c) 2002 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * default memory allocator for libavutil
 */

#include "config.h"

#include <limits.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#if HAVE_MALLOC_H
#include <malloc.h>
#endif

#include "mem.h"

/* here we can use OS-dependent allocation functions */
#undef free
#undef malloc
#undef realloc

#ifdef MALLOC_PREFIX

#define malloc         AV_JOIN(MALLOC_PREFIX, malloc)
#define memalign       AV_JOIN(MALLOC_PREFIX, memalign)
#define posix_memalign AV_JOIN(MALLOC_PREFIX, posix_memalign)
#define realloc        AV_JOIN(MALLOC_PREFIX, realloc)
#define free           AV_JOIN(MALLOC_PREFIX, free)

void *malloc(size_t size);
void *memalign(size_t align, size_t size);
int   posix_memalign(void **ptr, size_t align, size_t size);
void *realloc(void *ptr, size_t size);
void  free(void *ptr);

#endif /* MALLOC_PREFIX */


/* You can redefine av_malloc and av_free in your project to use your
   memory allocator. You do not need to suppress this file because the
   linker will do it automatically. */

void *av_malloc(unsigned int size)
{
    void *ptr = NULL;
    /* let's disallow possible ambiguous cases */
    if(size > (INT_MAX-16) )
        return NULL;

//FIXME: when no aligned mallocs vector code should be disabled.
#if HAVE_POSIX_MEMALIGN
    if (posix_memalign(&ptr,16,size))
        ptr = NULL;
#elif HAVE_MEMALIGN
    ptr = memalign(16,size);
#else
    ptr = malloc(size);
#endif
    return ptr;
}

void *av_realloc(void *ptr, unsigned int size)
{
    /* let's disallow possible ambiguous cases */
    if(size > (INT_MAX-16) )
        return NULL;

    return realloc(ptr, size);

}

void av_free(void *ptr)
{
    /* XXX: this test should not be needed on most libcs */
    if (ptr)
        free(ptr);

}

void av_freep(void *arg)
{
    void **ptr= (void**)arg;
    av_free(*ptr);
    *ptr = NULL;
}

void *av_mallocz(unsigned int size)
{
    void *ptr = av_malloc(size);
    if (ptr)
        memset(ptr, 0, size);
    return ptr;
}

char *av_strdup(const char *s)
{
    char *ptr= NULL;
    if(s){
        int len = strlen(s) + 1;
        ptr = av_malloc(len);
        if (ptr)
            memcpy(ptr, s, len);
    }
    return ptr;
}