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engines/made/redreader.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 MADE_REDREADER_H
+#define MADE_REDREADER_H
+
+#include "common/scummsys.h"
+
+namespace Common {
+class SeekableReadStream;
+class File;
+}
+
+namespace Made {
+
+class RedReader {
+public:
+	Common::SeekableReadStream *load(const char *redFilename, const char *filename);
+	static Common::SeekableReadStream *loadFromRed(const char *redFilename, const char *filename);
+private:
+	struct FileEntry {
+		uint32 compSize, origSize;
+	};
+	bool seekFile(Common::File &fd, FileEntry &fileEntry, const char *filename);
+};
+
+const uint BITBUFSIZ = 16;
+const uint DICBIT = 13;
+const uint DICSIZ = 1 << DICBIT;
+const uint MATCHBIT = 8;
+const uint MAXMATCH = 256;
+const uint THRESHOLD = 3;
+const uint NC = 255 + MAXMATCH + 2 - THRESHOLD;
+const uint CBIT = 9;
+const uint CODE_BIT = 16;
+const uint NP = DICBIT + 1;
+const int NT = CODE_BIT + 3;
+const uint PBIT = 4;
+const uint TBIT = 5;
+const uint NPT = NT;
+
+class LzhDecompressor {
+public:
+	LzhDecompressor();
+	~LzhDecompressor();
+	int decompress(Common::SeekableReadStream &source, byte *dest, uint32 compSize, uint32 origSize);
+private:
+	Common::SeekableReadStream *_source;
+	uint32 _compSize, _blockPos;
+
+	uint16 _bitbuf;
+	uint _subbitbuf;
+	int _bitcount;
+	uint16 _left[2 * NC - 1], _right[2 * NC - 1];
+	byte _c_len[NC], _pt_len[NPT];
+	uint _blocksize;
+	uint16 _c_table[4096], _pt_table[256];
+	int tree_n, heapsize;
+	short heap[NC + 1];
+	uint16 *freq, *sortptr, len_cnt[17];
+	byte *len_table;
+
+	int decode_i, decode_j;
+	int count_len_depth;
+
+	byte readByte();
+
+	void fillbuf(int count);
+	uint getbits(int count);
+	void init_getbits();
+	void decode_start();
+	void decode(uint count, byte text[]);
+	void huf_decode_start();
+	unsigned int decode_c();
+	unsigned int decode_p();
+	void read_pt_len(int nn, int nbit, int i_special);
+	void read_c_len();
+	void count_len(int i);
+	void make_len(int root);
+	void downheap(int i);
+	void make_code(int n, byte len[], uint16 code[]);
+	void make_table(uint nchar, byte bitlen[], uint tablebits, uint16 table[]);
+	int make_tree(int nparm, uint16 freqparm[], byte lenparm[], uint16 codeparm[]);
+
+};
+
+} // End of namespace Made
+
+#endif /* MADE_H */