Unarj code based on unarj 2.62. Used by Drascula engine

svn-id: r32460

1 files changed, 179 insertions, 0 deletions

diff --git a/common/unarj.h b/common/unarj.h
new file mode 100644
index 0000000000..63c6ca582d
--- /dev/null
+++ b/common/unarj.h
@@ -0,0 +1,179 @@
+/* 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 COMMON_UNARJ_H
+#define COMMON_UNARJ_H
+
+#include "common/file.h"
+#include "common/hash-str.h"
+
+namespace Common {
+
+#define HEADER_ID     0xEA60
+#define HEADER_ID_HI    0xEA
+#define HEADER_ID_LO    0x60
+#define FIRST_HDR_SIZE    30
+#define FIRST_HDR_SIZE_V  34
+#define COMMENT_MAX     2048
+#define FNAME_MAX           512
+#define HEADERSIZE_MAX   (FIRST_HDR_SIZE + 10 + FNAME_MAX + COMMENT_MAX)
+#define CRC_MASK        0xFFFFFFFFL
+#define MAXSFX              25000L
+
+#define CODE_BIT    16
+#define CHAR_BIT  8
+#define UCHAR_MAX 255
+#define THRESHOLD	3
+#define DDICSIZ	  26624
+#define MAXDICBIT   16
+#define MATCHBIT	 8
+#define MAXMATCH   256
+#define NC		  (UCHAR_MAX + MAXMATCH + 2 - THRESHOLD)
+#define NP		  (MAXDICBIT + 1)
+#define CBIT		 9
+#define NT		  (CODE_BIT + 3)
+#define PBIT		 5
+#define TBIT		 5
+
+#if NT > NP
+#define NPT NT
+#else
+#define NPT NP
+#endif
+
+#define CTABLESIZE  4096
+#define PTABLESIZE   256
+
+#define STRTP		  9
+#define STOPP		 13
+
+#define STRTL		  0
+#define STOPL		  7
+
+struct ArjHeader {
+	int32 pos;
+	uint16 id;
+	uint16 headerSize;
+	//
+	byte firstHdrSize;
+	byte nbr;
+	byte xNbr;
+	byte hostOs;
+	byte flags;
+	byte method;
+	byte fileType;
+	byte pad;
+	uint32 timeStamp;
+	int32 compSize;
+	int32 origSize;
+	uint32 fileCRC;
+	uint16 entryPos;
+	uint16 fileMode;
+	uint16 hostData;
+	char   filename[FNAME_MAX];
+	char   comment[COMMENT_MAX];
+	uint16 extHeaderSize;
+
+	uint32 headerCrc;
+};
+
+typedef HashMap<String, int, IgnoreCase_Hash, IgnoreCase_EqualTo> ArjFilesMap;
+
+class ArjFile : public File {
+public:
+	ArjFile();
+	~ArjFile();
+
+	void registerArchive(const String &filename);
+
+	bool open(const Common::String &filename, AccessMode mode = kFileReadMode);
+	void close();
+
+	uint32 read(void *dataPtr, uint32 dataSize);
+	bool eos();
+	uint32 pos();
+	uint32 size();
+	void seek(int32 offset, int whence = SEEK_SET);
+	bool isOpen() { return _isOpen; }
+
+private:
+	File _currArchive;
+	Array<ArjHeader *> _headers;
+	ArjFilesMap _fileMap;
+	StringMap _archMap;
+	ReadStream *_stream;
+	byte *_uncompressedData;
+	MemoryWriteStream *_outstream;
+	MemoryReadStream *_uncompressed;
+
+	bool _isOpen;
+
+	int32 findHeader(void);
+	ArjHeader *readHeader();
+
+	void decode();
+	void decode_f();
+
+	uint16 _bitbuf;
+	int32 _compsize;
+	int32 _origsize;
+	byte _subbitbuf;
+	int _bitcount;
+
+	void init_getbits();
+	void fillbuf(int n);
+	uint16 getbits(int n);
+	
+
+	void make_table(int nchar, byte *bitlen, int tablebits, uint16 *table, int tablesize);
+	void read_pt_len(int nn, int nbit, int i_special);
+	void read_c_len(void);
+	uint16 decode_c(void);
+	uint16 decode_p(void);
+	void decode_start(void);
+	int16 decode_ptr(void);
+	int16 decode_len(void);
+
+private:
+	byte  _text[DDICSIZ];
+
+	int16  _getlen;
+	int16  _getbuf;
+
+	uint16 _left[2 * NC - 1];
+	uint16 _right[2 * NC - 1];
+	byte  _c_len[NC];
+	byte  _pt_len[NPT];
+
+	uint16 _c_table[CTABLESIZE];
+	uint16 _pt_table[PTABLESIZE];
+	uint16 _blocksize;
+
+
+};
+
+} // End of namespace Common
+
+#endif