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typedef struct Whack		Whack;
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typedef struct Unwhack		Unwhack;
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enum
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{
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	WhackStats	= 8,
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	WhackErrLen	= 64,		/* max length of error message from thwack or unthwack */
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	WhackMaxOff	= 16*1024,	/* max allowed offset */
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	HashLog		= 14,
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	HashSize	= 1<<HashLog,
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	HashMask	= HashSize - 1,
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	MinMatch	= 3,		/* shortest match possible */
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	MinDecode	= 8,		/* minimum bits to decode a match or lit; >= 8 */
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	MaxSeqMask	= 8,		/* number of bits in coding block mask */
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	MaxSeqStart	= 256		/* max offset of initial coding block */
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};
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struct Whack
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{
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	ushort		begin;			/* time of first byte in hash */
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	ushort		hash[HashSize];
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	ushort		next[WhackMaxOff];
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	uchar		*data;
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};
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struct Unwhack
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{
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	char		err[WhackErrLen];
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};
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void	whackinit(Whack*, int level);
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void	unwhackinit(Unwhack*);
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int	whack(Whack*, uchar *dst, uchar *src, int nsrc, ulong stats[WhackStats]);
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int	unwhack(Unwhack*, uchar *dst, int ndst, uchar *src, int nsrc);
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int	whackblock(uchar *dst, uchar *src, int ssize);