1 /*
2 * alloc.c
3 * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
5 *
6 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
7 * See http://libmpeg2.sourceforge.net/ for updates.
8 *
9 * mpeg2dec is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * mpeg2dec is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <stdlib.h>
25 #include <inttypes.h>
26
27 #include "mpeg2.h"
28
29 static void * (* malloc_hook) (unsigned size, mpeg2_alloc_t reason) = NULL;
30 static int (* free_hook) (void * buf) = NULL;
31
mpeg2_malloc(unsigned size,mpeg2_alloc_t reason)32 void * mpeg2_malloc (unsigned size, mpeg2_alloc_t reason)
33 {
34 char * buf;
35
36 if (malloc_hook) {
37 buf = (char *) malloc_hook (size, reason);
38 if (buf)
39 return buf;
40 }
41
42 if (size) {
43 buf = (char *) malloc (size + 63 + sizeof (void **));
44 if (buf) {
45 char * align_buf;
46
47 align_buf = buf + 63 + sizeof (void **);
48 align_buf -= (long)align_buf & 63;
49 *(((void **)align_buf) - 1) = buf;
50 return align_buf;
51 }
52 }
53 return NULL;
54 }
55
mpeg2_free(void * buf)56 void mpeg2_free (void * buf)
57 {
58 if (free_hook && free_hook (buf))
59 return;
60
61 if (buf)
62 free (*(((void **)buf) - 1));
63 }
64
mpeg2_malloc_hooks(void * alloc_func (unsigned,mpeg2_alloc_t),int free_func (void *))65 void mpeg2_malloc_hooks (void * alloc_func (unsigned, mpeg2_alloc_t),
66 int free_func (void *))
67 {
68 malloc_hook = alloc_func;
69 free_hook = free_func;
70 }
71