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Diffstat (limited to 'engines/tony/mpal/memory.cpp')
-rw-r--r-- | engines/tony/mpal/memory.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/engines/tony/mpal/memory.cpp b/engines/tony/mpal/memory.cpp new file mode 100644 index 0000000000..78b036e657 --- /dev/null +++ b/engines/tony/mpal/memory.cpp @@ -0,0 +1,129 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * + */ + +#include "common/algorithm.h" +#include "common/textconsole.h" +#include "tony/mpal/memory.h" + +namespace Tony { + +namespace MPAL { + +/****************************************************************************\ +* MemoryManager methods +\****************************************************************************/ + +const uint32 BLOCK_ID = 0x12345678; + +/** + * Allocates a new memory block + * @return Returns a MemoryItem instance for the new block + */ +MpalHandle MemoryManager::allocate(uint32 size, uint flags) { + MemoryItem *newItem = (MemoryItem *)malloc(sizeof(MemoryItem) + size); + newItem->_id = BLOCK_ID; + newItem->_size = size; + newItem->_lockCount = 0; + + // If requested, clear the allocated data block + if ((flags & GMEM_ZEROINIT) != 0) { + byte *dataP = newItem->_data; + Common::fill(dataP, dataP + size, 0); + } + + return (MpalHandle)newItem; +} + +/** + * Allocates a new memory block and returns its data pointer + * @return Data pointer to allocated block + */ +void *MemoryManager::alloc(uint32 size, uint flags) { + MemoryItem *item = (MemoryItem *)allocate(size, flags); + ++item->_lockCount; + return &item->_data[0]; +} + +#define OFFSETOF(type, field) ((size_t) &(((type *) 0)->field)) + +/** + * Returns a reference to the MemoryItem for a gien byte pointer + * @param block Byte pointer + */ +MemoryItem *MemoryManager::getItem(MpalHandle handle) { + MemoryItem *rec = (MemoryItem *)((byte *)handle - OFFSETOF(MemoryItem, _data)); + assert(rec->_id == BLOCK_ID); + return rec; +} + +/** + * Returns a size of a memory block given its pointer + */ +uint32 MemoryManager::getSize(MpalHandle handle) { + MemoryItem *item = (MemoryItem *)handle; + assert(item->_id == BLOCK_ID); + return item->_size; +} + +/** + * Erases a given item + */ +void MemoryManager::freeBlock(MpalHandle handle) { + MemoryItem *item = (MemoryItem *)handle; + assert(item->_id == BLOCK_ID); + free(item); +} + +/** + * Erases a given item + */ +void MemoryManager::destroyItem(MpalHandle handle) { + MemoryItem *item = getItem(handle); + assert(item->_id == BLOCK_ID); + free(item); +} + +/** + * Locks an item for access + */ +byte *MemoryManager::lockItem(MpalHandle handle) { + MemoryItem *item = (MemoryItem *)handle; + assert(item->_id == BLOCK_ID); + ++item->_lockCount; + return &item->_data[0]; +} + +/** + * Unlocks a locked item + */ +void MemoryManager::unlockItem(MpalHandle handle) { + MemoryItem *item = (MemoryItem *)handle; + assert(item->_id == BLOCK_ID); + assert(item->_lockCount > 0); + --item->_lockCount; +} + + +} // end of namespace MPAL + +} // end of namespace Tony |