Artifact 3b0fe0be3dd0a1e58f03069b7e674a76dd626e8b

• File LzhDecoder2.h
  • 2011-02-23 13:30:53 - part of checkin [5128eecc9f] on branch trunk - Copied from private svn repository. (user: kinaba) [annotate]

#ifndef AFX_LZHDECODER2_H__31F8AA04_3F84_11D4_8D96_8AB5A6462337__INCLUDED_
#define AFX_LZHDECODER2_H__31F8AA04_3F84_11D4_8D96_8AB5A6462337__INCLUDED_

#define MAXMATCH	256
#define THRESHOLD	3

#define NT      (16+3)
#define TBIT 	5
#define CBIT	9
#define NC 	    (255+MAXMATCH+2-THRESHOLD)
#define NPT 	0x80

#define N_CHAR      (256+60-THRESHOLD+1)
#define TREESIZE_C  (N_CHAR*2)
#define TREESIZE_P  (128*2)
#define TREESIZE    (TREESIZE_C+TREESIZE_P)
#define ROOT_C      0
#define ROOT_P      TREESIZE_C

enum lzh_method{ LH0,LH4,LH5,LH6,LH7,UNKNOWN };

class CLzhDecoder2  
{
public:
	void Decode( lzh_method mhd,FILE* infile,DWORD insize,
								FILE* outfile,DWORD outsize );

private:
	void Unstore();
	WORD Decode_C(lzh_method mhd)
	{switch( mhd ){
		case LH4:
		case LH5:
		case LH6:
		case LH7:return decode_c_st1();
	}return 0;};
	WORD Decode_P(lzh_method mhd)
	{switch( mhd ){
		case LH4:
		case LH5:
		case LH6:
		case LH7:return decode_p_st1();
	}return 0;};

private:
	// 全般的に
	FILE *in,*out;
	DWORD cmpsize,orisize;

	DWORD loc;

	// lh4-lh7
	void make_table(WORD nchar,BYTE* bitlen,WORD tablebits,WORD* table);
	void read_pt_len(short nn,short nbit,short i_special);
	void read_c_len();
	WORD decode_c_st1();
	WORD decode_p_st1();

	WORD left[ 2*NC-1 ], right[ 2*NC-1 ];
	BYTE c_len[NC], pt_len[NPT];
	WORD c_table[4096],pt_table[256];

	WORD blocksize;
	int  pbit;
	int  np;

	// bit単位のread&write
	void init_getbits();
	void fillbuf(BYTE n);
	WORD getbits(BYTE n);
	WORD bitbuf;BYTE subbitbuf,bitcount;
};

#endif