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41 lines
966 B
C
41 lines
966 B
C
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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);
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