1 a0d146ed 2005-07-12 devnull typedef struct Whack		Whack;
 2 a0d146ed 2005-07-12 devnull typedef struct Unwhack		Unwhack;
 3 a0d146ed 2005-07-12 devnull 
 4 a0d146ed 2005-07-12 devnull enum
 5 a0d146ed 2005-07-12 devnull {
 6 a0d146ed 2005-07-12 devnull 	WhackStats	= 8,
 7 a0d146ed 2005-07-12 devnull 	WhackErrLen	= 64,		/* max length of error message from thwack or unthwack */
 8 a0d146ed 2005-07-12 devnull 	WhackMaxOff	= 16*1024,	/* max allowed offset */
 9 a0d146ed 2005-07-12 devnull 
10 a0d146ed 2005-07-12 devnull 	HashLog		= 14,
11 a0d146ed 2005-07-12 devnull 	HashSize	= 1<<HashLog,
12 a0d146ed 2005-07-12 devnull 	HashMask	= HashSize - 1,
13 a0d146ed 2005-07-12 devnull 
14 a0d146ed 2005-07-12 devnull 	MinMatch	= 3,		/* shortest match possible */
15 a0d146ed 2005-07-12 devnull 
16 a0d146ed 2005-07-12 devnull 	MinDecode	= 8,		/* minimum bits to decode a match or lit; >= 8 */
17 a0d146ed 2005-07-12 devnull 
18 a0d146ed 2005-07-12 devnull 	MaxSeqMask	= 8,		/* number of bits in coding block mask */
19 a0d146ed 2005-07-12 devnull 	MaxSeqStart	= 256		/* max offset of initial coding block */
20 a0d146ed 2005-07-12 devnull };
21 a0d146ed 2005-07-12 devnull 
22 a0d146ed 2005-07-12 devnull struct Whack
23 a0d146ed 2005-07-12 devnull {
24 a0d146ed 2005-07-12 devnull 	ushort		begin;			/* time of first byte in hash */
25 a0d146ed 2005-07-12 devnull 	ushort		hash[HashSize];
26 a0d146ed 2005-07-12 devnull 	ushort		next[WhackMaxOff];
27 a0d146ed 2005-07-12 devnull 	uchar		*data;
28 a0d146ed 2005-07-12 devnull };
29 a0d146ed 2005-07-12 devnull 
30 a0d146ed 2005-07-12 devnull struct Unwhack
31 a0d146ed 2005-07-12 devnull {
32 a0d146ed 2005-07-12 devnull 	char		err[WhackErrLen];
33 a0d146ed 2005-07-12 devnull };
34 a0d146ed 2005-07-12 devnull 
35 a0d146ed 2005-07-12 devnull void	whackinit(Whack*, int level);
36 a0d146ed 2005-07-12 devnull void	unwhackinit(Unwhack*);
37 a0d146ed 2005-07-12 devnull int	whack(Whack*, uchar *dst, uchar *src, int nsrc, ulong stats[WhackStats]);
38 a0d146ed 2005-07-12 devnull int	unwhack(Unwhack*, uchar *dst, int ndst, uchar *src, int nsrc);
39 a0d146ed 2005-07-12 devnull 
40 a0d146ed 2005-07-12 devnull int	whackblock(uchar *dst, uchar *src, int ssize);