usr.sbin/pkg_install/sign/gzip.h

   1 /*-
   2  * Copyright (c) 1999 Marc Espie.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. All advertising materials mentioning features or use of this software
  13  *    must display the following acknowledgement:
  14  *      This product includes software developed by Marc Espie for the OpenBSD
  15  * Project.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
  21  * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * $OpenBSD: gzip.h,v 1.2 1999/10/04 21:46:28 espie Exp $
  30  * $FreeBSD: src/usr.sbin/pkg_install/sign/gzip.h,v 1.2 2001/05/17 10:12:45 sobomax Exp $
  31  * $DragonFly: src/usr.sbin/pkg_install/sign/gzip.h,v 1.4 2004/07/30 06:46:14 dillon Exp $
  32  */
  33
  34 #define GZIP_MAGIC0     '\037'
  35 #define GZIP_MAGIC1     '\213'
  36 /* flags values */
  37 #define CONTINUATION    0x02
  38 #define EXTRA_FIELD     0x04
  39
  40 /*
  41  * Meaningful fields in a gzip header, see gzip proper for details.
  42  * This structure should not be fiddled with outside of gzip_read_header
  43  * and gzip_write_header
  44  */
  45 struct mygzip_header {
  46         char method;
  47         char flags;
  48         char stamp[6];
  49         char part[2];
  50                 /* remaining extra, after know signs have been read */
  51         unsigned int  remaining;
  52 };
  53
  54 #define TAGSIZE 8
  55 #define TAGCHECK 6
  56
  57 typedef unsigned char SIGNTAG[8];
  58
  59 /* stack of signatures */
  60 struct signature {
  61         SIGNTAG tag;
  62         int  type;
  63         int  length;
  64         char *data;
  65         struct signature *next;
  66 };
  67
  68 /* returns from gzip_read_header */
  69 #define GZIP_UNSIGNED           0       /* gzip file, no signature */
  70 #define GZIP_SIGNED             1       /* gzip file, signature parsed ok */
  71 #define GZIP_NOT_GZIP           2       /* not a proper gzip file */
  72 #define GZIP_NOT_PGPSIGNED      3       /* gzip file, unknown extension */
  73 extern int gzip_read_header (FILE *f, /*@out@*/struct mygzip_header *h, \
  74         /*@null@*/struct signature **sign);
  75 /* gzip_write_header returns 1 for success */
  76 extern int gzip_write_header (FILE *f, const struct mygzip_header *h, \
  77         /*@null@*/struct signature *sign);
  78 /*
  79  * Writing header to memory. Returns size needed, or 0 if buffer too small
  80  * buffer must be at least 14 characters
  81  */
  82 extern int gzip_copy_header (const struct mygzip_header *h, \
  83         /*@null@*/struct signature *sign, \
  84         void (*add)(void *, const char *, size_t), void *data);
  85
  86 extern void free_signature (/*@null@*/struct signature *sign);
  87 extern void sign_fill_tag (struct signature *sign);
  88 #define KNOWN_TAGS 4
  89 #define TAG_PGP 0
  90 #define TAG_SHA1 1
  91 #define TAG_X509 2
  92 #define TAG_OLD 3
  93 #define TAG_ANY -1
  94 #define pgptag (known_tags[TAG_PGP])
  95 #define sha1tag (known_tags[TAG_SHA1])
  96 #define x509tag (known_tags[TAG_X509])
  97 extern SIGNTAG known_tags[KNOWN_TAGS];