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Annotation of coherent/g/usr/bin/gzip/lzw.h, revision 1.1

1.1     ! root        1: /* lzw.h -- define the lzw functions.
        !             2:  * Copyright (C) 1992-1993 Jean-loup Gailly.
        !             3:  * This is free software; you can redistribute it and/or modify it under the
        !             4:  * terms of the GNU General Public License, see the file COPYING.
        !             5:  */
        !             6: 
        !             7: #if !defined(OF) && defined(lint)
        !             8: #  include "gzip.h"
        !             9: #endif
        !            10: 
        !            11: #ifndef BITS
        !            12: #  define BITS 16
        !            13: #endif
        !            14: #define INIT_BITS 9              /* Initial number of bits per code */
        !            15: 
        !            16: #define        LZW_MAGIC  "\037\235"   /* Magic header for lzw files, 1F 9D */
        !            17: 
        !            18: #define BIT_MASK    0x1f /* Mask for 'number of compresssion bits' */
        !            19: /* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
        !            20:  * It's a pity that old uncompress does not check bit 0x20. That makes
        !            21:  * extension of the format actually undesirable because old compress
        !            22:  * would just crash on the new format instead of giving a meaningful
        !            23:  * error message. It does check the number of bits, but it's more
        !            24:  * helpful to say "unsupported format, get a new version" than
        !            25:  * "can only handle 16 bits".
        !            26:  */
        !            27: 
        !            28: #define BLOCK_MODE  0x80
        !            29: /* Block compresssion: if table is full and compression rate is dropping,
        !            30:  * clear the dictionary.
        !            31:  */
        !            32: 
        !            33: #define LZW_RESERVED 0x60 /* reserved bits */
        !            34: 
        !            35: #define        CLEAR  256       /* flush the dictionary */
        !            36: #define FIRST  (CLEAR+1) /* first free entry */
        !            37: 
        !            38: extern int maxbits;      /* max bits per code for LZW */
        !            39: extern int block_mode;   /* block compress mode -C compatible with 2.0 */
        !            40: 
        !            41: extern void lzw    OF((int in, int out));
        !            42: extern void unlzw  OF((int in, int out));

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