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79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/*
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* gzip.h -- common declarations for all gzip modules
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* Copyright (C) 1992-1993 Jean-loup Gailly.
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* Adapted for FreeBSD boot unpacker by Serge Vakulenko.
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* This is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License, see the file COPYING.
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*/
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typedef unsigned char uchar;
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typedef unsigned long ulong;
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#define NULL 0
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#define STORED 0 /* Compression methods */
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#define COMPRESSED 1
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#define PACKED 2
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#define DEFLATED 8 /* methods 3 to 7 reserved */
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#define INBUFSIZ 0x8000 /* input buffer size */
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#define OUTBUFSIZ 16384 /* output buffer size */
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#define OUTBUF_EXTRA 2048 /* required by unlzw() */
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#define GZIP_MAGIC "\037\213" /* gzip files, 1F 8B */
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#define OLD_GZIP_MAGIC "\037\236" /* gzip 0.5 = freeze 1.x */
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#define PKZIP_MAGIC "PK\003\004" /* pkzip files */
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#define PACK_MAGIC "\037\036" /* packed files */
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#define LZW_MAGIC "\037\235" /* lzw files, 1F 9D */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* file probably ascii text */
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#define CONTINUATION 0x02 /* cont. of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* extra field present */
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#define ORIG_NAME 0x08 /* original file name present */
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#define COMMENT 0x10 /* file comment present */
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#define ENCRYPTED 0x20 /* file is encrypted */
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#define RESERVED 0xC0 /* reserved */
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/* window size--must be a power of two, and */
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/* at least 32K for zip's deflate method */
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#define WSIZE 0x8000
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extern int method; /* compression method */
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extern uchar *inbuf; /* input buffer */
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extern uchar *outbuf; /* output buffer */
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extern uchar *window; /* Sliding window and suffix table (unlzw) */
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extern unsigned insize; /* valid bytes in inbuf */
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extern unsigned inptr; /* index of next byte to be processed in inbuf */
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extern unsigned outcnt; /* bytes in output buffer */
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extern int pkzip; /* set for a pkzip file */
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extern int extended; /* set if extended local header */
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extern ulong crc; /* shift register contents */
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extern ulong output_ptr; /* total output bytes */
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extern void unzip (void);
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extern void check_zipfile (void);
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extern void updcrc (uchar *s, unsigned n);
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extern void clear_bufs (void);
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extern void fill_inbuf (void);
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extern void flush_window (void);
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extern void error (char *m);
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static inline uchar get_byte ()
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{
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if (inptr >= insize)
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fill_inbuf ();
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return (inbuf[inptr++]);
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}
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static inline void put_char (uchar c)
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{
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window[outcnt++] = c;
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if (outcnt == WSIZE)
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flush_window();
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}
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