Initial commit

engines/illusions/gamestate.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 "illusions/gamestate.h"
+
+namespace Illusions {
+
+GameState::GameState()
+	: _writeBufferSize(0), _writeBuffer(nullptr), _readStream(nullptr) {
+}
+
+GameState::~GameState() {
+	free(_writeBuffer);
+}
+
+bool GameState::readState(uint32 &sceneId, uint32 &threadId) {
+	sceneId = _readStream->readUint32LE();
+	threadId = _readStream->readUint32LE();
+	return readStateInternal(_readStream);
+}
+
+void GameState::writeState(uint32 sceneId, uint32 threadId) {
+	Common::WriteStream *writeStream = newWriteStream();
+	writeStream->writeUint32LE(sceneId);
+	writeStream->writeUint32LE(threadId);
+	writeStateInternal(writeStream);
+	delete writeStream;
+}
+
+void GameState::read(Common::ReadStream *in) {
+	uint32 size = in->readUint32LE();
+	_readStream = in->readStream(size);
+}
+
+void GameState::write(Common::WriteStream *out) {
+	out->writeUint32LE(_writeBufferSize);
+	out->write(_writeBuffer, _writeBufferSize);
+}
+
+void GameState::deleteReadStream() {
+	delete _readStream;
+	_readStream = nullptr;
+}
+
+Common::WriteStream *GameState::newWriteStream() {
+	if (_writeBufferSize == 0 || !_writeBuffer) {
+		_writeBufferSize = calcWriteBufferSize();
+		_writeBuffer = (byte*)malloc(_writeBufferSize);
+	}
+	return new Common::MemoryWriteStream(_writeBuffer, _writeBufferSize);
+}
+
+uint32 GameState::calcWriteBufferSize() {
+	return calcWriteBufferSizeInternal() + 4 + 4;
+}
+
+} // End of namespace Illusions