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diff --git a/engines/m4/compression.h b/engines/m4/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 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef M4_COMPRESSION_H
+#define M4_COMPRESSION_H
+
+#include "common/scummsys.h"
+#include "common/stream.h"
+#include "common/endian.h"
+
+#include "m4/m4.h"
+
+namespace M4 {
+
+struct MadsPackEntry {
+public:
+	uint16 hash;
+	uint32 size;
+	uint32 compressedSize;
+	byte *data;
+};
+
+class MadsPack {
+private:
+	MadsPackEntry *_items;
+	int _count;
+	int _dataOffset;
+
+	void initialise(Common::SeekableReadStream *stream);
+public:
+	static bool isCompressed(Common::SeekableReadStream *stream);
+	MadsPack(Common::SeekableReadStream *stream);
+	MadsPack(const char *resourceName, M4Engine* _vm);
+	~MadsPack();
+
+	int getCount() const { return _count; }
+	MadsPackEntry &getItem(int index) const { return _items[index]; }
+	MadsPackEntry &operator[](int index) const { return _items[index]; }
+	Common::MemoryReadStream *getItemStream(int index) {
+		return new Common::MemoryReadStream(_items[index].data, _items[index].size, false);
+	}
+	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 M4
+
+
+#endif