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/* $OpenBSD: gzip.h,v 1.5 2003/06/04 04:29:03 deraadt Exp $ */
/*-
* Copyright (c) 1999 Marc Espie.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define GZIP_MAGIC0 '\037'
#define GZIP_MAGIC1 '\213'
/* flags values */
#define CONTINUATION 0x02
#define EXTRA_FIELD 0x04
/* meaningful fields in a gzip header, see gzip proper for details.
This structure should not be fiddled with outside of gzip_read_header
and gzip_write_header
*/
struct mygzip_header {
char method;
char flags;
char stamp[6];
char part[2];
/* remaining extra, after know signs have been read */
unsigned int remaining;
};
#define TAGSIZE 8
#define TAGCHECK 6
typedef unsigned char SIGNTAG[8];
/* stack of signatures */
struct signature {
SIGNTAG tag;
int type;
int length;
char *data;
struct signature *next;
};
/* returns from gzip_read_header */
#define GZIP_UNSIGNED 0 /* gzip file, no signature */
#define GZIP_SIGNED 1 /* gzip file, signature parsed ok */
#define GZIP_NOT_GZIP 2 /* not a proper gzip file */
#define GZIP_NOT_PGPSIGNED 3 /* gzip file, unknown extension */
extern int gzip_read_header(FILE *f, /*@out@*/struct mygzip_header *h, \
/*@null@*/struct signature **sign);
/* gzip_write_header returns 1 for success */
extern int gzip_write_header(FILE *f, const struct mygzip_header *h, \
/*@null@*/struct signature *sign);
/* writing header to memory. Returns size needed, or 0 if buffer too small
buffer must be at least 14 characters */
extern int gzip_copy_header(const struct mygzip_header *h, \
/*@null@*/struct signature *sign, \
void (*add)(void *, const char *, size_t), void *data);
extern void free_signature(/*@null@*/struct signature *sign);
extern void sign_fill_tag(struct signature *sign);
#define KNOWN_TAGS 3
#define TAG_PGP 0
#define TAG_SHA1 1
#define TAG_OLD 2
#define TAG_ANY -1
#define pgptag (known_tags[TAG_PGP])
#define sha1tag (known_tags[TAG_SHA1])
extern SIGNTAG known_tags[KNOWN_TAGS];
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