1 /*-
2 * Copyright (c) 2003-2011 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 #include "archive.h"
29 #include "archive_private.h"
30
31 int
archive_read_support_format_all(struct archive * a)32 archive_read_support_format_all(struct archive *a)
33 {
34 archive_check_magic(a, ARCHIVE_READ_MAGIC,
35 ARCHIVE_STATE_NEW, "archive_read_support_format_all");
36
37 /* TODO: It would be nice to compute the ordering
38 * here automatically so that people who enable just
39 * a few formats can still get the benefits. That
40 * may just require the format registration to include
41 * a "maximum read-ahead" value (anything that uses seek
42 * would be essentially infinite read-ahead). The core
43 * bid management can then sort the bidders before calling
44 * them.
45 *
46 * If you implement the above, please return the list below
47 * to alphabetic order.
48 */
49
50 /*
51 * These bidders are all pretty cheap; they just examine a
52 * small initial part of the archive. If one of these bids
53 * high, we can maybe avoid running any of the more expensive
54 * bidders below.
55 */
56 archive_read_support_format_ar(a);
57 archive_read_support_format_cpio(a);
58 archive_read_support_format_empty(a);
59 archive_read_support_format_lha(a);
60 archive_read_support_format_mtree(a);
61 archive_read_support_format_tar(a);
62 archive_read_support_format_xar(a);
63 archive_read_support_format_warc(a);
64
65 /*
66 * Install expensive bidders last. By doing them last, we
67 * increase the chance that a high bid from someone else will
68 * make it unnecessary for these to do anything at all.
69 */
70 /* These have potentially large look-ahead. */
71 archive_read_support_format_7zip(a);
72 archive_read_support_format_cab(a);
73 archive_read_support_format_rar(a);
74 archive_read_support_format_rar5(a);
75 archive_read_support_format_iso9660(a);
76 /* Seek is really bad, since it forces the read-ahead
77 * logic to discard buffered data. */
78 archive_read_support_format_zip(a);
79
80 /* Note: We always return ARCHIVE_OK here, even if some of the
81 * above return ARCHIVE_WARN. The intent here is to enable
82 * "as much as possible." Clients who need specific
83 * compression should enable those individually so they can
84 * verify the level of support. */
85 /* Clear any warning messages set by the above functions. */
86 archive_clear_error(a);
87 return (ARCHIVE_OK);
88 }
89