ILLUSIONS: Add GAM archive reader for Duckman and adjust the resource reader/system

1 files changed, 101 insertions, 0 deletions

diff --git a/engines/illusions/gamarchive.cpp b/engines/illusions/gamarchive.cpp
new file mode 100644
index 0000000000..517882c501
--- /dev/null
+++ b/engines/illusions/gamarchive.cpp
@@ -0,0 +1,101 @@
+/* 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 "illusions/gamarchive.h"
+
+namespace Illusions {
+
+GamArchive::GamArchive(const char *filename)
+	: _fd(0), _groupCount(0), _groups(0) {
+	_fd = new Common::File();
+	if (!_fd->open(filename))
+		error("GamArchive::GamArchive() Could not open %s", filename);
+	loadDictionary();
+}
+
+GamArchive::~GamArchive() {
+	delete[] _groups;
+}
+
+byte *GamArchive::readResource(uint32 sceneId, uint32 resId, uint32 &dataSize) {
+	const GamFileEntry *fileEntry = getGroupFileEntry(sceneId, resId);
+	_fd->seek(fileEntry->_fileOffset);
+	dataSize = fileEntry->_fileSize;
+	byte *data = (byte*)malloc(dataSize);
+	_fd->read(data, dataSize);
+	return data;
+}
+
+void GamArchive::loadDictionary() {
+	_groupCount = _fd->readUint32LE();
+	_groups = new GamGroupEntry[_groupCount];
+	uint32 *groupOffsets = new uint32[_groupCount];
+	
+	for (uint i = 0; i < _groupCount; ++i) {
+		_groups[i]._id = _fd->readUint32LE();
+		groupOffsets[i] = _fd->readUint32LE();
+	}
+	
+	for (uint i = 0; i < _groupCount; ++i) {
+		_fd->seek(groupOffsets[i]);
+		uint32 fileCount = _fd->readUint32LE();
+		_groups[i]._fileCount = fileCount;
+		_groups[i]._files = new GamFileEntry[fileCount];
+		
+		debug("Group %08X, fileCount: %d", _groups[i]._id, _groups[i]._fileCount);
+		
+		for (uint j = 0; j < fileCount; ++j) {
+			_groups[i]._files[j]._id = _fd->readUint32LE();
+			_groups[i]._files[j]._fileOffset = _fd->readUint32LE();
+			_groups[i]._files[j]._fileSize = _fd->readUint32LE();
+			debug("  %08X, %08X, %d", _groups[i]._files[j]._id, _groups[i]._files[j]._fileOffset, _groups[i]._files[j]._fileSize);
+		}
+	}
+
+	delete[] groupOffsets;
+}
+
+const GamGroupEntry *GamArchive::getGroupEntry(uint32 sceneId) {
+	for (uint i = 0; i < _groupCount; ++i)
+		if (_groups[i]._id == sceneId)
+			return &_groups[i];
+	return 0;
+}
+
+const GamFileEntry *GamArchive::getFileEntry(const GamGroupEntry *groupEntry, uint32 resId) {
+	for (uint i = 0; i < groupEntry->_fileCount; ++i)
+		if (groupEntry->_files[i]._id == resId)
+			return &groupEntry->_files[i];
+	return 0;
+}
+
+const GamFileEntry *GamArchive::getGroupFileEntry(uint32 sceneId, uint32 resId) {
+	const GamGroupEntry *groupEntry = getGroupEntry(sceneId);
+	if (!groupEntry)
+		error("GamArchive::getFileEntry() Group %08X not found", sceneId);
+	const GamFileEntry *fileEntry = getFileEntry(groupEntry, resId);
+	if (!fileEntry)
+		error("GamArchive::getFileEntry() File %08X in group %08X not found", resId, sceneId);
+	return fileEntry;
+}
+
+} // End of namespace Illusions