mirror of
https://github.com/libretro/scummvm.git
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126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003-2004 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "sword1/memman.h"
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#include "common/util.h"
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namespace Sword1 {
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MemMan::MemMan(void) {
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_alloced = 0;
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_memListFree = _memListFreeEnd = NULL;
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}
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MemMan::~MemMan(void) {
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}
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void MemMan::alloc(MemHandle *bsMem, uint32 pSize, uint16 pCond) {
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_alloced += pSize;
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bsMem->data = (void*)malloc(pSize);
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if (!bsMem->data)
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error("MemMan::alloc(): Can't alloc %d bytes of memory.", pSize);
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bsMem->cond = pCond;
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bsMem->size = pSize;
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if (pCond == MEM_CAN_FREE) {
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warning("%d Bytes alloced as FREEABLE.", pSize); // why should one want to alloc mem if it can be freed?
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addToFreeList(bsMem);
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} else if (bsMem->next || bsMem->prev) // it's in our _freeAble list, remove it from there
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removeFromFreeList(bsMem);
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checkMemoryUsage();
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}
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void MemMan::freeNow(MemHandle *bsMem) {
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if (bsMem->cond != MEM_FREED) {
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_alloced -= bsMem->size;
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removeFromFreeList(bsMem);
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free(bsMem->data);
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bsMem->cond = MEM_FREED;
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}
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}
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void MemMan::setCondition(MemHandle *bsMem, uint16 pCond) {
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if ((pCond == MEM_FREED) || (pCond > MEM_DONT_FREE))
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error("MemMan::setCondition: program tried to set illegal memory condition");
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if (bsMem->cond != pCond) {
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bsMem->cond = pCond;
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if (pCond == MEM_DONT_FREE)
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removeFromFreeList(bsMem);
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else if (pCond == MEM_CAN_FREE)
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addToFreeList(bsMem);
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}
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}
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void MemMan::flush(void) {
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while (_memListFree) {
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free(_memListFreeEnd->data);
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_memListFreeEnd->data = NULL;
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_memListFreeEnd->cond = MEM_FREED;
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_alloced -= _memListFreeEnd->size;
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removeFromFreeList(_memListFreeEnd);
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}
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if (_alloced)
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warning("MemMan::flush: Something's wrong: still %d bytes alloced", _alloced);
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}
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void MemMan::checkMemoryUsage(void) {
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while ((_alloced > MAX_ALLOC) && _memListFree) {
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free(_memListFreeEnd->data);
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_memListFreeEnd->data = NULL;
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_memListFreeEnd->cond = MEM_FREED;
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_alloced -= _memListFreeEnd->size;
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removeFromFreeList(_memListFreeEnd);
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}
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}
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void MemMan::addToFreeList(MemHandle *bsMem) {
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if (bsMem->next || bsMem->prev) {
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warning("addToFreeList: mem block is already in freeList");
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return;
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}
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bsMem->prev = NULL;
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bsMem->next = _memListFree;
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if (bsMem->next)
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bsMem->next->prev = bsMem;
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_memListFree = bsMem;
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if (!_memListFreeEnd)
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_memListFreeEnd = _memListFree;
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}
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void MemMan::removeFromFreeList(MemHandle *bsMem) {
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if (_memListFree == bsMem)
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_memListFree = bsMem->next;
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if (_memListFreeEnd == bsMem)
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_memListFreeEnd = bsMem->prev;
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if (bsMem->next)
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bsMem->next->prev = bsMem->prev;
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if (bsMem->prev)
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bsMem->prev->next = bsMem->next;
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bsMem->next = bsMem->prev = NULL;
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}
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void MemMan::initHandle(MemHandle *bsMem) {
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memset(bsMem, 0, sizeof(MemHandle));
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}
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} // End of namespace Sword1
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