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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.
*
* $URL$
* $Id$
*
*/
#ifndef COMMON_UNARJ_H
#define COMMON_UNARJ_H
#include "common/file.h"
#include "common/hash-str.h"
namespace Common {
#define ARJ_UCHAR_MAX 255
#define ARJ_CHAR_BIT 8
#define ARJ_COMMENT_MAX 2048
#define ARJ_FILENAME_MAX 512
#define ARJ_CODE_BIT 16
#define ARJ_THRESHOLD 3
#define ARJ_DICSIZ 26624
#define ARJ_FDICSIZ ARJ_DICSIZ
#define ARJ_MAXDICBIT 16
#define ARJ_MAXMATCH 256
#define ARJ_NC (ARJ_UCHAR_MAX + ARJ_MAXMATCH + 2 - ARJ_THRESHOLD)
#define ARJ_NP (ARJ_MAXDICBIT + 1)
#define ARJ_NT (ARJ_CODE_BIT + 3)
#if ARJ_NT > ARJ_NP
#define ARJ_NPT ARJ_NT
#else
#define ARJ_NPT ARJ_NP
#endif
#define ARJ_CTABLESIZE 4096
#define ARJ_PTABLESIZE 256
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[ARJ_FILENAME_MAX];
char comment[ARJ_COMMENT_MAX];
uint32 headerCrc;
};
typedef HashMap<String, int, IgnoreCase_Hash, IgnoreCase_EqualTo> ArjFilesMap;
class ArjFile : public SeekableReadStream, public NonCopyable {
public:
ArjFile();
~ArjFile();
void enableFallback(bool val) { _fallBack = val; }
void registerArchive(const String &filename);
bool open(const Common::String &filename);
void close();
uint32 read(void *dataPtr, uint32 dataSize);
bool eos() const;
int32 pos() const;
int32 size() const;
bool seek(int32 offset, int whence = SEEK_SET);
bool isOpen() { return _isOpen; }
private:
bool _fallBack;
File _currArchive;
Array<ArjHeader *> _headers;
ArjFilesMap _fileMap;
StringMap _archMap;
ReadStream *_stream;
byte *_uncompressedData;
byte *_compressedData;
MemoryWriteStream *_outstream;
MemoryReadStream *_compressed;
SeekableReadStream *_uncompressed;
bool _isOpen;
int32 findHeader(void);
ArjHeader *readHeader();
void decode();
void decode_f();
uint16 _bitbuf;
uint16 _bytebuf;
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 _ntext[ARJ_FDICSIZ];
int16 _getlen;
int16 _getbuf;
uint16 _left[2 * ARJ_NC - 1];
uint16 _right[2 * ARJ_NC - 1];
byte _c_len[ARJ_NC];
byte _pt_len[ARJ_NPT];
uint16 _c_table[ARJ_CTABLESIZE];
uint16 _pt_table[ARJ_PTABLESIZE];
uint16 _blocksize;
};
} // End of namespace Common
#endif
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