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/* gzip.h -- common declarations for all gzip modules
* Copyright (C) 1992-1993 Jean-loup Gailly.
* 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.
*/
#ifndef GZIP_H
#define GZIP_H
#include "string.h"
#define memzero(s, n) memset ((s), 0, (n))
/* Return codes from gzip */
#define OK 0
#define ERROR 1
#define WARNING 2
/* Compression methods (see algorithm.doc) */
#define STORED 0
#define COMPRESSED 1
#define PACKED 2
/*
* methods 3 to 7 reserved
*/
#define DEFLATED 8
extern unsigned long bytes_out; /* # of uncompressed bytes */
extern int method; /* compression method */
#define INBUFSIZ 0x20000 /* input buffer size */
#define WSIZE 0x8000 /* window size--must be a power of two, and */
/* at least 32K for zip's deflate method */
unsigned char *inbuf; /* input buffer */
unsigned char *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 */
#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
#define PKZIP_MAGIC "PK\003\004" /* Magic header for pkzip files */
#define PACK_MAGIC "\037\036" /* Magic header for packed files */
/* gzip flag byte */
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
#define COMMENT 0x10 /* bit 4 set: file comment present */
#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
#define RESERVED 0xC0 /* bit 6,7: reserved */
/* internal file attribute */
#define UNKNOWN (-1)
#define BINARY 0
#define ASCII 1
#define MIN_MATCH 3
#define MAX_MATCH 258
/* The minimum and maximum match lengths */
#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
/* Minimum amount of lookahead, except at the end of the input file.
* See deflate.c for comments about the MIN_MATCH+1.
*/
#define MAX_DIST (WSIZE-MIN_LOOKAHEAD)
/* In order to simplify the code, particularly on 16 bit machines, match
* distances are limited to MAX_DIST instead of WSIZE.
*/
#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
#define put_char(c) {window[outcnt++]=(unsigned char)(c); if (outcnt==WSIZE)\
flush_window();}
/* Macros for getting two-byte and four-byte header values */
#define SH(p) ((unsigned short)(unsigned char)((p)[0]) | ((unsigned short)(unsigned char)((p)[1]) << 8))
#define LG(p) ((unsigned long)(SH(p)) | ((unsigned long)(SH((p)+2)) << 16))
/* in unzip.c */
extern void unzip (int in, int out);
/* in misc.c: */
extern unsigned long updcrc (unsigned char *s, unsigned n);
extern void clear_bufs (void);
extern int fill_inbuf (void);
extern void flush_window (void);
extern void unzip_error (char *m);
/* in inflate.c */
extern int inflate (void);
#endif /* GZIP_H */
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