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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program 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.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* Efficient memory allocation for lots of similar small chunks.
*/
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "BLI_memarena.h"
#include "BLI_linklist.h"
struct MemArena {
unsigned char *curbuf;
int bufsize, cursize;
LinkNode *bufs;
};
MemArena *BLI_memarena_new(int bufsize) {
MemArena *ma= MEM_callocN(sizeof(*ma), "memarena");
ma->bufsize= bufsize;
return ma;
}
void BLI_memarena_free(MemArena *ma) {
BLI_linklist_free(ma->bufs, MEM_freeN);
MEM_freeN(ma);
}
/* amt must be power of two */
#define PADUP(num, amt) ((num+(amt-1))&~(amt-1))
void *BLI_memarena_alloc(MemArena *ma, int size) {
void *ptr;
/* ensure proper alignment by rounding
* size up to multiple of 8 */
size= PADUP(size, 8);
if (size>=ma->cursize) {
ma->cursize= (size>ma->bufsize)?size:ma->bufsize;
ma->curbuf= MEM_mallocN(ma->cursize, "ma->curbuf");
BLI_linklist_prepend(&ma->bufs, ma->curbuf);
}
ptr= ma->curbuf;
ma->curbuf+= size;
ma->cursize-= size;
return ptr;
}
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