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engines/mads/compression.h

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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/>.
+ *
+ */
+
+#ifndef MADS_COMPRESSION_H
+#define MADS_COMPRESSION_H
+
+#include "common/memstream.h"
+#include "common/stream.h"
+
+#include "mads/mads.h"
+
+namespace MADS {
+
+enum CompressionType { COMPRESS_NONE = 0, COMPRESS_FAB = 1 };
+
+struct MadsPackEntry {
+public:
+	CompressionType _type;
+	byte _priority;
+	uint32 _size;
+	uint32 _compressedSize;
+	byte *_data;
+};
+
+class MadsPack {
+private:
+	MadsPackEntry *_items;
+	int _count;
+	int _dataOffset;
+
+	void initialize(Common::SeekableReadStream *stream);
+public:
+	static bool isCompressed(Common::SeekableReadStream *stream);
+	MadsPack(Common::SeekableReadStream *stream);
+	MadsPack(const Common::Path &resourceName, MADSEngine *_vm);
+	~MadsPack();
+
+	int getCount() const { return _count; }
+	MadsPackEntry &getItem(int index) const {
+		assert(index < _count);
+		return _items[index]; }
+	MadsPackEntry &operator[](int index) const {
+		assert(index < _count);
+		return _items[index];
+	}
+	Common::MemoryReadStream *getItemStream(int index) {
+		assert(index < _count);
+		return new Common::MemoryReadStream(_items[index]._data, _items[index]._size,
+			DisposeAfterUse::NO);
+	}
+	int getDataOffset() const { return _dataOffset; }
+};
+
+class FabDecompressor {
+private:
+	int _bitsLeft;
+	uint32 _bitBuffer;
+	const byte *_srcData, *_srcP;
+	int _srcSize;
+
+	int getBit();
+public:
+	void decompress(const byte *srcData, int srcSize, byte *destData, int destSize);
+};
+
+} // End of namespace MADS
+
+#endif