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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
*
* 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.
* 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.
*
* $Header$
*
*/
#include "stdafx.h"
#include "memman.h"
#include "common/util.h"
MemMan::MemMan(void) {
_alloced = 0;
_memListFree = _memListFreeEnd = NULL;
}
MemMan::~MemMan(void) {
}
void MemMan::alloc(BsMemHandle *bsMem, uint32 pSize, uint16 pCond) {
_alloced += pSize;
bsMem->data = (void*)malloc(pSize);
if (!bsMem->data)
error("MemMan::alloc(): Can't alloc %d bytes of memory.", pSize);
bsMem->cond = pCond;
bsMem->size = pSize;
if (pCond == MEM_CAN_FREE) {
warning("%d Bytes alloced as FREEABLE.", pSize); // why should one want to alloc mem if it can be freed?
addToFreeList(bsMem);
} else if (bsMem->next || bsMem->prev) // it's in our _freeAble list, remove it from there
removeFromFreeList(bsMem);
checkMemoryUsage();
}
void MemMan::freeNow(BsMemHandle *bsMem) {
if (bsMem->cond != MEM_FREED) {
_alloced -= bsMem->size;
removeFromFreeList(bsMem);
free(bsMem->data);
bsMem->cond = MEM_FREED;
}
}
void MemMan::setCondition(BsMemHandle *bsMem, uint16 pCond) {
if ((pCond == MEM_FREED) || (pCond > MEM_DONT_FREE))
error("MemMan::setCondition: program tried to set illegal memory condition");
if (bsMem->cond != pCond) {
bsMem->cond = pCond;
if (pCond == MEM_DONT_FREE)
removeFromFreeList(bsMem);
else if (pCond == MEM_CAN_FREE)
addToFreeList(bsMem);
}
}
void MemMan::flush(void) {
while (_memListFree) {
free(_memListFreeEnd->data);
_memListFreeEnd->data = NULL;
_memListFreeEnd->cond = MEM_FREED;
_alloced -= _memListFreeEnd->size;
removeFromFreeList(_memListFreeEnd);
}
if (_alloced)
warning("MemMan::flush: Something's wrong: still %d bytes alloced", _alloced);
}
void MemMan::checkMemoryUsage(void) {
while ((_alloced > MAX_ALLOC) && _memListFree) {
free(_memListFreeEnd->data);
_memListFreeEnd->data = NULL;
_memListFreeEnd->cond = MEM_FREED;
_alloced -= _memListFreeEnd->size;
removeFromFreeList(_memListFreeEnd);
}
}
void MemMan::addToFreeList(BsMemHandle *bsMem) {
if (bsMem->next || bsMem->prev) {
warning("addToFreeList: mem block is already in freeList");
return;
}
bsMem->prev = NULL;
bsMem->next = _memListFree;
if (bsMem->next)
bsMem->next->prev = bsMem;
_memListFree = bsMem;
if (!_memListFreeEnd)
_memListFreeEnd = _memListFree;
}
void MemMan::removeFromFreeList(BsMemHandle *bsMem) {
if (_memListFree == bsMem)
_memListFree = bsMem->next;
if (_memListFreeEnd == bsMem)
_memListFreeEnd = bsMem->prev;
if (bsMem->next)
bsMem->next->prev = bsMem->prev;
if (bsMem->prev)
bsMem->prev->next = bsMem->next;
bsMem->next = bsMem->prev = NULL;
}
void MemMan::initHandle(BsMemHandle *bsMem) {
memset(bsMem, 0, sizeof(BsMemHandle));
}
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