171 lines
5.5 KiB
C
171 lines
5.5 KiB
C
/* gzip.h -- common declarations for all gzip modules
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* Copyright (C) 1992-1993 Jean-loup Gailly.
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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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#if defined(__STDC__) || defined(PROTO)
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# define OF(args) args
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#else
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# define OF(args) ()
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#endif
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#ifdef __STDC__
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typedef void *voidp;
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#else
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typedef char *voidp;
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#endif
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/* I don't like nested includes, but the string and io functions are used
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* too often
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*/
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#include <stdio.h>
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#if !defined(NO_STRING_H) || defined(STDC_HEADERS)
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# include <string.h>
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# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
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# include <memory.h>
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# endif
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# define memzero(s, n) memset ((voidp)(s), 0, (n))
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#else
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# include <strings.h>
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# define strchr index
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# define strrchr rindex
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# define memcpy(d, s, n) bcopy((s), (d), (n))
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# define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
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# define memzero(s, n) bzero((s), (n))
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#endif
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#ifndef RETSIGTYPE
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# define RETSIGTYPE void
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#endif
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#define local static
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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/* Return codes from gzip */
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#define OK 0
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#define ERROR 1
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#define WARNING 2
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/* Compression methods (see algorithm.doc) */
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#define STORED 0
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#define COMPRESSED 1
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#define PACKED 2
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#define LZHED 3
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/* methods 4 to 7 reserved */
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#define DEFLATED 8
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#define MAX_METHODS 9
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#define INBUF_EXTRA 64 /* required by unlzw() */
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#define DIST_BUFSIZE 0x2000
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extern uch *inbuf; /* input buffer */
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extern uch *outbuf; /* output buffer */
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extern ush *d_buf; /* buffer for distances, see trees.c */
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extern uch *tab_suffix; /* suffix table (unlzw) */
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extern ush *tab_prefix; /* prefix code (see unlzw.c) */
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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 unsigned outbufsiz; /* size of output buffer */
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extern long bytes_in; /* number of input bytes */
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extern long bytes_out; /* number of output bytes */
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extern long header_bytes;/* number of bytes in gzip header */
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#define isize bytes_in
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/* for compatibility with old zip sources (to be cleaned) */
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typedef int file_t; /* Do not use stdio */
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#define NO_FILE (-1) /* in memory compression */
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#define PACK_MAGIC "\037\036" /* Magic header for packed files */
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#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
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#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
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#define LZH_MAGIC "\037\240" /* Magic header for SCO LZH Compress files*/
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#define PKZIP_MAGIC "\120\113\003\004" /* Magic header for pkzip files */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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/* internal file attribute */
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#define UNKNOWN 0xffff
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#define BINARY 0
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#define ASCII 1
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# define WSIZE 4096 /* window size--must be a power of two */
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extern int decrypt; /* flag to turn on decryption */
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extern int exit_code; /* program exit code */
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extern int verbose; /* be verbose (-v) */
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extern int quiet; /* be quiet (-q) */
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extern int level; /* compression level */
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extern int test; /* check .z file integrity */
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extern int to_stdout; /* output to stdout (-c) */
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extern int save_orig_name; /* set if original name must be saved */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
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#define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
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/* put_byte is used for the compressed output, put_ubyte for the
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* uncompressed output. However unlzw() uses window for its
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* suffix table instead of its output buffer, so it does not use put_ubyte
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* (to be cleaned up).
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*/
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#define put_ubyte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==outbufsiz)\
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flush_outbuf();}
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#define seekable() 0 /* force sequential output */
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#define translate_eol 0 /* no option -a yet */
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#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
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/* Macros for getting two-byte and four-byte header values */
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#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
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#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
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/* Diagnostic functions */
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#ifdef DEBUG
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# define Assert(cond,msg) {if(!(cond)) error(msg);}
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# define Trace(x) fprintf x
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# define Tracev(x) {if (verbose) fprintf x ;}
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# define Tracevv(x) {if (verbose>1) fprintf x ;}
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# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
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# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
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#else
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# define Assert(cond,msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c,x)
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# define Tracecv(c,x)
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#endif
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#define WARN(msg) {if (!quiet) fprintf msg ; \
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if (exit_code == OK) exit_code = WARNING;}
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/* in unpack.c */
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extern int unpack OF((int in, int out));
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/* in unlzh.c */
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extern int unlzh OF((int in, int out));
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/* in inflate.c */
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extern int inflate OF((void));
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extern int fill_inbuf OF((int eof_ok));
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extern void flush_outbuf OF((void));
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extern void write_buf OF((int fd, voidp buf, unsigned cnt));
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extern void error OF((char *m));
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