124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/algorithm.h"
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#include "common/textconsole.h"
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#include "tony/mpal/memory.h"
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namespace Tony {
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namespace MPAL {
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/****************************************************************************\
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* MemoryManager methods
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\****************************************************************************/
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/**
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* Allocates a new memory block
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* @return Returns a MemoryItem instance for the new block
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*/
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MpalHandle MemoryManager::allocate(uint32 size, uint flags) {
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MemoryItem *newItem = (MemoryItem *)malloc(sizeof(MemoryItem) + size);
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newItem->_id = BLOCK_ID;
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newItem->_size = size;
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newItem->_lockCount = 0;
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// If requested, clear the allocated data block
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if ((flags & GMEM_ZEROINIT) != 0) {
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byte *dataP = newItem->_data;
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Common::fill(dataP, dataP + size, 0);
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}
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return (MpalHandle)newItem;
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}
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/**
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* Allocates a new memory block and returns its data pointer
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* @return Data pointer to allocated block
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*/
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void *MemoryManager::alloc(uint32 size, uint flags) {
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MemoryItem *item = (MemoryItem *)allocate(size, flags);
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++item->_lockCount;
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return &item->_data[0];
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}
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#define OFFSETOF(type, field) ((size_t) &(((type *) 0)->field))
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/**
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* Returns a reference to the MemoryItem for a gien byte pointer
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* @param block Byte pointer
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*/
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MemoryItem *MemoryManager::getItem(MpalHandle handle) {
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MemoryItem *rec = (MemoryItem *)((byte *)handle - OFFSETOF(MemoryItem, _data));
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assert(rec->_id == BLOCK_ID);
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return rec;
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}
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/**
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* Returns a size of a memory block given its pointer
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*/
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uint32 MemoryManager::getSize(MpalHandle handle) {
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MemoryItem *item = (MemoryItem *)handle;
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assert(item->_id == BLOCK_ID);
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return item->_size;
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}
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/**
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* Erases a given item
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*/
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void MemoryManager::freeBlock(MpalHandle handle) {
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MemoryItem *item = (MemoryItem *)handle;
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assert(item->_id == BLOCK_ID);
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free(item);
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}
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/**
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* Erases a given item
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*/
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void MemoryManager::destroyItem(MpalHandle handle) {
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MemoryItem *item = getItem(handle);
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assert(item->_id == BLOCK_ID);
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free(item);
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}
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/**
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* Locks an item for access
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*/
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byte *MemoryManager::lockItem(MpalHandle handle) {
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MemoryItem *item = (MemoryItem *)handle;
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assert(item->_id == BLOCK_ID);
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++item->_lockCount;
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return &item->_data[0];
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}
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/**
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* Unlocks a locked item
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*/
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void MemoryManager::unlockItem(MpalHandle handle) {
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MemoryItem *item = (MemoryItem *)handle;
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assert(item->_id == BLOCK_ID);
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assert(item->_lockCount > 0);
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--item->_lockCount;
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}
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} // end of namespace MPAL
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} // end of namespace Tony
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