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engines/grim/update/packfile.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 PACKFILE_H
+#define PACKFILE_H
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Grim {
+
+class PackFile : public Common::SeekableReadStream {
+public:
+	PackFile(Common::SeekableReadStream *data);
+	~PackFile();
+
+	bool err() const;
+	void clearErr();
+	uint32 read(void *dataPtr, uint32 dataSize);
+	bool eos() const;
+	int64 pos() const;
+	int64 size() const;
+	bool seek(int64 offset, int whence = SEEK_SET);
+
+private:
+	Common::SeekableReadStream *_orgStream;
+	int32 _offset, _size;
+
+	uint16 *_codeTable;
+	const uint32 _kCodeTableSize;
+
+	void createCodeTable(uint32 key);
+	void decode(uint8 *data, uint32 size, uint32 start_point);
+
+	static const uint32 _knownOffsets[5];
+};
+
+} // end of namespace Grim
+
+#endif