TONY: Added resource update manager

1 files changed, 114 insertions, 0 deletions

diff --git a/engines/tony/utils.cpp b/engines/tony/utils.cpp
new file mode 100644
index 0000000000..1368111a05
--- /dev/null
+++ b/engines/tony/utils.cpp
@@ -0,0 +1,114 @@
+/* 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 "tony/utils.h"
+#include "mpal/lzo.h"
+
+namespace Tony {
+
+/****************************************************************************\
+*       Resource Update
+\****************************************************************************/
+
+RMResUpdate::RMResUpdate() {
+	_infos = NULL;
+}
+
+RMResUpdate::~RMResUpdate() {
+	if (_infos) {
+		delete[] _infos;
+		_infos = NULL;
+	}
+
+	if (_hFile.isOpen())
+		_hFile.close();
+}
+
+void RMResUpdate::Init(const Common::String &fileName) {
+	// Open the resource update file
+	if (!_hFile.open(fileName))
+		// It doesn't exist, so exit immediately
+		return;
+
+	uint8 version;
+	uint32 i;
+
+	version = _hFile.readByte();
+	_numUpd = _hFile.readUint32LE();
+
+	_infos = new ResUpdInfo[_numUpd];
+
+	// Load the index of the resources in the file
+	for (i=0; i<_numUpd; ++i) {
+		ResUpdInfo &info = _infos[i];
+
+		info.dwRes = _hFile.readUint32LE();
+		info.offset = _hFile.readUint32LE();
+		info.size = _hFile.readUint32LE();
+		info.cmpSize = _hFile.readUint32LE();
+	}
+}
+
+const byte *RMResUpdate::QueryResource(uint32 dwRes) {
+	// If there isn't an update file, return NULL
+	if (!_hFile.isOpen())
+		return NULL;
+
+	uint32 i;
+	for (i=0; i < _numUpd; ++i)
+		if (_infos[i].dwRes == dwRes)
+			// Found the index
+			break;
+
+	if (i==_numUpd)
+		// Couldn't find a matching resource, so return NULL
+		return NULL;
+
+	const ResUpdInfo &info = _infos[i];
+	byte *cmpBuf = new byte[info.cmpSize];
+	uint32 dwRead;
+
+	// Move to the correct offset and read in the compressed data
+	_hFile.seek(info.offset);
+	dwRead = _hFile.read(cmpBuf, info.cmpSize);
+
+	if (info.cmpSize > dwRead) {
+		// Error occurred reading data, so return NULL
+		delete[] cmpBuf;
+		return NULL;
+	}
+
+	// Allocate space for the output resource
+	byte *lpDestBuf = new byte[info.size];
+	uint32 dwSize;
+
+	// Decompress the data
+	MPAL::lzo1x_decompress(cmpBuf, info.cmpSize, lpDestBuf, &dwSize);
+
+	// Delete buffer for compressed data
+	delete [] cmpBuf;
+
+	// Return the resource
+	return lpDestBuf;
+}
+
+} // End of namespace Tony