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revision 1.6, Wed Jun 12 20:38:41 2002 UTC revision 1.9, Thu Sep 5 21:32:30 2002 UTC
# Line 1  Line 1 
1    /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *  - Aligned memory allocator -
5     *
6     *  Copyright(C) 2002 Michael Militzer
7     *               2002 Edouard Gomez
8     *
9     *  This program is an implementation of a part of one or more MPEG-4
10     *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
11     *  to use this software module in hardware or software products are
12     *  advised that its use may infringe existing patents or copyrights, and
13     *  any such use would be at such party's own risk.  The original
14     *  developer of this software module and his/her company, and subsequent
15     *  editors and their companies, will have no liability for use of this
16     *  software or modifications or derivatives thereof.
17     *
18     *  This program is free software ; you can redistribute it and/or modify
19     *  it under the terms of the GNU General Public License as published by
20     *  the Free Software Foundation ; either version 2 of the License, or
21     *  (at your option) any later version.
22     *
23     *  This program is distributed in the hope that it will be useful,
24     *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
25     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26     *  GNU General Public License for more details.
27     *
28     *  You should have received a copy of the GNU General Public License
29     *  along with this program ; if not, write to the Free Software
30     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
31     *
32     * $Id$
33     *
34     ****************************************************************************/
35    
36  #include <stdlib.h>  #include <stdlib.h>
37  #include <stdio.h>  #include <stdio.h>
38  #include "mem_align.h"  #include "mem_align.h"
39    
40    /*****************************************************************************
41     * xvid_malloc
42     *
43     * This function allocates 'size' bytes (usable by the user) on the heap and
44     * takes care of the requested 'alignment'.
45     * In order to align the allocated memory block, the xvid_malloc allocates
46     * 'size' bytes + 'alignment' bytes. So try to keep alignment very small
47     * when allocating small pieces of memory.
48     *
49     * NB : a block allocated by xvid_malloc _must_ be freed with xvid_free
50     *      (the libc free will return an error)
51     *
52     * Returned value : - NULL on error
53     *                  - Pointer to the allocated aligned block
54     *
55     ****************************************************************************/
56    
57  void *  void *
58  xvid_malloc(size_t size,  xvid_malloc(size_t size,
59                          uint8_t alignment)                          uint8_t alignment)
# Line 33  Line 85 
85    
86                          /* Align the tmp pointer */                          /* Align the tmp pointer */
87                          mem_ptr =                          mem_ptr =
88                                  (uint8_t *) ((uint32_t) (tmp + alignment - 1) &                                  (uint8_t *) ((ptr_t) (tmp + alignment - 1) &
89                                                           (~(uint32_t) (alignment - 1)));                                                           (~(ptr_t) (alignment - 1)));
90    
91                          /*                          /*
92                           * Special case where malloc have already satisfied the alignment                           * Special case where malloc have already satisfied the alignment
# Line 62  Line 114 
114    
115  }  }
116    
117    /*****************************************************************************
118     * xvid_free
119     *
120     * Free a previously 'xvid_malloc' allocated block. Does not free NULL
121     * references.
122     *
123     * Returned value : None.
124     *
125     ****************************************************************************/
126    
127  void  void
128  xvid_free(void *mem_ptr)  xvid_free(void *mem_ptr)
129  {  {

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