/* $Id$
 * alloc.c
 * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
 *
 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
 * See http://libmpeg2.sourceforge.net/ for updates.
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpeg2dec 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stddef.h>
#include <inttypes.h>

#include "mpeg2.h"

static void * (* malloc_hook) (unsigned size, mpeg2_alloc_t reason) = NULL;
static int (* free_hook) (void * buf) = NULL;

void * mpeg2_malloc( unsigned size, mpeg2_alloc_t reason )
{
    char *buf = NULL;

    if (malloc_hook)
    {
        buf = (char *) malloc_hook (size, reason);
        if (buf)
            return buf;
    }

    if (size)
    {
        buf = (char *) malloc (size + 63 + sizeof (void **));
        if (buf)
        {
            char * align_buf = NULL;

            align_buf = buf + 63 + sizeof (void **);
            align_buf -= (long)align_buf & 63;
            *(((void **)align_buf) - 1) = buf;
            return align_buf;
        }
    }
    return NULL;
}

void mpeg2_free( void * buf )
{
    if (free_hook && free_hook (buf))
        return;

    if (buf)
        free (*(((void **)buf) - 1));
}

void mpeg2_malloc_hooks( void * malloc (unsigned, mpeg2_alloc_t),
                         int free (void *) )
{
    malloc_hook = malloc;
    free_hook = free;
}
