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+/* 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) ((unsigned long) &(((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