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