whack.h (966B)
1 typedef struct Whack Whack; 2 typedef struct Unwhack Unwhack; 3 4 enum 5 { 6 WhackStats = 8, 7 WhackErrLen = 64, /* max length of error message from thwack or unthwack */ 8 WhackMaxOff = 16*1024, /* max allowed offset */ 9 10 HashLog = 14, 11 HashSize = 1<<HashLog, 12 HashMask = HashSize - 1, 13 14 MinMatch = 3, /* shortest match possible */ 15 16 MinDecode = 8, /* minimum bits to decode a match or lit; >= 8 */ 17 18 MaxSeqMask = 8, /* number of bits in coding block mask */ 19 MaxSeqStart = 256 /* max offset of initial coding block */ 20 }; 21 22 struct Whack 23 { 24 ushort begin; /* time of first byte in hash */ 25 ushort hash[HashSize]; 26 ushort next[WhackMaxOff]; 27 uchar *data; 28 }; 29 30 struct Unwhack 31 { 32 char err[WhackErrLen]; 33 }; 34 35 void whackinit(Whack*, int level); 36 void unwhackinit(Unwhack*); 37 int whack(Whack*, uchar *dst, uchar *src, int nsrc, ulong stats[WhackStats]); 38 int unwhack(Unwhack*, uchar *dst, int ndst, uchar *src, int nsrc); 39 40 int whackblock(uchar *dst, uchar *src, int ssize);