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diff --git a/engines/adl/disk.h b/engines/adl/disk.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.
+ *
+ */
+
+#include "common/ptr.h"
+#include "common/file.h"
+#include "common/debug.h"
+
+#ifndef ADL_DISK_H
+#define ADL_DISK_H
+
+namespace Common {
+class SeekableReadStream;
+class String;
+}
+
+namespace Adl {
+
+class DataBlock {
+public:
+	virtual ~DataBlock() { }
+
+	virtual Common::SeekableReadStream *createReadStream() const = 0;
+};
+
+typedef Common::SharedPtr<DataBlock> DataBlockPtr;
+typedef Common::ScopedPtr<Common::SeekableReadStream> StreamPtr;
+
+class Files {
+public:
+	virtual ~Files() { }
+
+	virtual const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const = 0;
+	virtual Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const = 0;
+
+protected:
+	class DataBlock : public Adl::DataBlock {
+	public:
+		DataBlock(const Files *files, const Common::String &filename, uint offset) :
+				_files(files),
+				_filename(filename),
+				_offset(offset) { }
+
+		Common::SeekableReadStream *createReadStream() const {
+			return _files->createReadStream(_filename, _offset);
+		}
+
+	private:
+		const Common::String _filename;
+		uint _offset;
+		const Files *_files;
+	};
+};
+
+class DiskImage {
+public:
+	DiskImage() :
+			_tracks(0),
+			_sectorsPerTrack(0),
+			_bytesPerSector(0) {
+		_f = new Common::File();
+	}
+
+	virtual ~DiskImage() {
+		delete _f;
+	}
+
+	virtual bool open(const Common::String &filename) = 0;
+	virtual const DataBlockPtr getDataBlock(uint track, uint sector, uint offset = 0, uint size = 0) const = 0;
+	virtual Common::SeekableReadStream *createReadStream(uint track, uint sector, uint offset = 0, uint size = 0) const = 0;
+
+protected:
+	class DataBlock : public Adl::DataBlock {
+	public:
+		DataBlock(const DiskImage *disk, uint track, uint sector, uint offset, uint size) :
+				_track(track),
+				_sector(sector),
+				_offset(offset),
+				_size(size),
+				_disk(disk) { }
+
+		Common::SeekableReadStream *createReadStream() const {
+			return _disk->createReadStream(_track, _sector, _offset, _size);
+		}
+
+	private:
+		uint _track, _sector, _offset, _size;
+		const DiskImage *_disk;
+	};
+
+	Common::File *_f;
+	uint _tracks, _sectorsPerTrack, _bytesPerSector;
+};
+
+// Data in plain files
+class Files_Plain : public Files {
+public:
+	const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const;
+	Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const;
+};
+
+// .DSK disk image - 35 tracks, 16 sectors per track, 256 bytes per sector
+class DiskImage_DSK : public DiskImage {
+public:
+	bool open(const Common::String &filename);
+	const DataBlockPtr getDataBlock(uint track, uint sector, uint offset = 0, uint size = 0) const;
+	Common::SeekableReadStream *createReadStream(uint track, uint sector, uint offset = 0, uint size = 0) const;
+};
+
+// .NIB disk image
+class DiskImage_NIB : public DiskImage {
+public:
+	DiskImage_NIB() : _memStream(nullptr) { }
+	virtual ~DiskImage_NIB() {
+		delete _memStream;
+	}
+
+	bool open(const Common::String &filename);
+	const DataBlockPtr getDataBlock(uint track, uint sector, uint offset = 0, uint size = 0) const;
+	Common::SeekableReadStream *createReadStream(uint track, uint sector, uint offset = 0, uint size = 0) const;
+
+private:
+	Common::SeekableReadStream *_memStream;
+};
+
+// Data in files contained in Apple DOS 3.3 disk image
+class Files_DOS33 : public Files {
+public:
+	Files_DOS33();
+	~Files_DOS33();
+
+	bool open(const Common::String &filename);
+	const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const;
+	Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const;
+
+private:
+	enum FileType {
+		kFileTypeText = 0,
+		kFileTypeAppleSoft = 2,
+		kFileTypeBinary = 4 
+	};
+
+	enum {
+		kSectorSize = 256,
+		kFilenameLen = 30
+	};
+
+	struct TrackSector {
+		byte track;
+		byte sector;
+	};
+
+	struct TOCEntry {
+		byte type;
+		uint16 totalSectors;
+		Common::Array<TrackSector> sectors;
+	};
+
+	void readVTOC();
+	void readSectorList(TrackSector start, Common::Array<TrackSector> &list);
+	Common::SeekableReadStream *createReadStreamText(const TOCEntry &entry) const;
+	Common::SeekableReadStream *createReadStreamBinary(const TOCEntry &entry) const;
+
+	DiskImage *_disk;
+	Common::HashMap<Common::String, TOCEntry> _toc;
+};
+
+} // End of namespace Adl
+
+#endif