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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 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/>.
+ *
+ */
+
+#include "common/ptr.h"
+#include "common/file.h"
+#include "common/debug.h"
+
+#include "common/formats/disk_image.h"
+
+#ifndef ADL_DISK_H
+#define ADL_DISK_H
+
+namespace Common {
+class SeekableReadStream;
+class String;
+}
+
+namespace Adl {
+
+// On the Apple II, sector headers contain a disk volume number. This number
+// is used by ADL multi-disk games. The PC port has the disk volume number
+// as the first data byte of every sector that contains game data. We need
+// to skip this number as we read in the data. Additionally, the data is now
+// prefixed with an uint16 containing the data size.
+class DataBlock_PC : public Common::DataBlock {
+public:
+	DataBlock_PC(Common::DiskImage *disk, byte track, byte sector, uint16 offset = 0) :
+			_disk(disk),
+			_track(track),
+			_sector(sector),
+			_offset(offset) { }
+
+	~DataBlock_PC() override { }
+
+	Common::SeekableReadStream *createReadStream() const override;
+
+private:
+	void read(Common::SeekableReadStream &stream, byte *const dataPtr, const uint32 size) const;
+
+	Common::DiskImage *_disk;
+	byte _track, _sector;
+	uint16 _offset;
+};
+
+} // End of namespace Adl
+
+#endif