1 /*-
2 * Copyright (c) 2003-2007 Tim Kientzle
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "archive_platform.h"
27
28 __FBSDID("$FreeBSD$");
29
30
31 #ifdef HAVE_ERRNO_H
32 #include <errno.h>
33 #endif
34 #ifdef HAVE_STDLIB_H
35 #include <stdlib.h>
36 #endif
37 #ifdef HAVE_STRING_H
38 #include <string.h>
39 #endif
40 #ifdef HAVE_UNISTD_H
41 #include <unistd.h>
42 #endif
43
44 #include "archive.h"
45 #include "archive_private.h"
46 #include "archive_read_private.h"
47
48 #define LRZIP_HEADER_MAGIC "LRZI"
49 #define LRZIP_HEADER_MAGIC_LEN 4
50
51 static int lrzip_bidder_bid(struct archive_read_filter_bidder *,
52 struct archive_read_filter *);
53 static int lrzip_bidder_init(struct archive_read_filter *);
54
55
56 static int
lrzip_reader_free(struct archive_read_filter_bidder * self)57 lrzip_reader_free(struct archive_read_filter_bidder *self)
58 {
59 (void)self; /* UNUSED */
60 return (ARCHIVE_OK);
61 }
62
63 int
archive_read_support_filter_lrzip(struct archive * _a)64 archive_read_support_filter_lrzip(struct archive *_a)
65 {
66 struct archive_read *a = (struct archive_read *)_a;
67 struct archive_read_filter_bidder *reader;
68
69 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
70 ARCHIVE_STATE_NEW, "archive_read_support_filter_lrzip");
71
72 if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK)
73 return (ARCHIVE_FATAL);
74
75 reader->data = NULL;
76 reader->name = "lrzip";
77 reader->bid = lrzip_bidder_bid;
78 reader->init = lrzip_bidder_init;
79 reader->options = NULL;
80 reader->free = lrzip_reader_free;
81 /* This filter always uses an external program. */
82 archive_set_error(_a, ARCHIVE_ERRNO_MISC,
83 "Using external lrzip program for lrzip decompression");
84 return (ARCHIVE_WARN);
85 }
86
87 /*
88 * Bidder just verifies the header and returns the number of verified bits.
89 */
90 static int
lrzip_bidder_bid(struct archive_read_filter_bidder * self,struct archive_read_filter * filter)91 lrzip_bidder_bid(struct archive_read_filter_bidder *self,
92 struct archive_read_filter *filter)
93 {
94 const unsigned char *p;
95 ssize_t avail, len;
96 int i;
97
98 (void)self; /* UNUSED */
99 /* Start by looking at the first six bytes of the header, which
100 * is all fixed layout. */
101 len = 6;
102 p = __archive_read_filter_ahead(filter, len, &avail);
103 if (p == NULL || avail == 0)
104 return (0);
105
106 if (memcmp(p, LRZIP_HEADER_MAGIC, LRZIP_HEADER_MAGIC_LEN))
107 return (0);
108
109 /* current major version is always 0, verify this */
110 if (p[LRZIP_HEADER_MAGIC_LEN])
111 return 0;
112 /* support only v0.6+ lrzip for sanity */
113 i = p[LRZIP_HEADER_MAGIC_LEN + 1];
114 if ((i < 6) || (i > 10))
115 return 0;
116
117 return (int)len;
118 }
119
120 static int
lrzip_bidder_init(struct archive_read_filter * self)121 lrzip_bidder_init(struct archive_read_filter *self)
122 {
123 int r;
124
125 r = __archive_read_program(self, "lrzip -d -q");
126 /* Note: We set the format here even if __archive_read_program()
127 * above fails. We do, after all, know what the format is
128 * even if we weren't able to read it. */
129 self->code = ARCHIVE_FILTER_LRZIP;
130 self->name = "lrzip";
131 return (r);
132 }
133