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engines/tony/mpal/memory.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/algorithm.h"
+#include "common/textconsole.h"
+#include "tony/mpal/memory.h"
+
+namespace Tony {
+
+namespace MPAL {
+
+/****************************************************************************\
+*       MemoryManager methods
+\****************************************************************************/
+
+/**
+ * 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) - sizeof(byte[1]) + 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
+ */
+void *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