contrib/libarchive/libarchive/archive_read_support_format_all.c

   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 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_all.c 174991 2007-12-30 04:58:22Z kientzle $");
  28
  29 #include "archive.h"
  30 #include "archive_private.h"
  31
  32 int
  33 archive_read_support_format_all(struct archive *a)
  34 {
  35         archive_check_magic(a, ARCHIVE_READ_MAGIC,
  36             ARCHIVE_STATE_NEW, "archive_read_support_format_all");
  37
  38         /* TODO: It would be nice to compute the ordering
  39          * here automatically so that people who enable just
  40          * a few formats can still get the benefits.  That
  41          * may just require the format registration to include
  42          * a "maximum read-ahead" value (anything that uses seek
  43          * would be essentially infinite read-ahead).  The core
  44          * bid management can then sort the bidders before calling
  45          * them.
  46          *
  47          * If you implement the above, please return the list below
  48          * to alphabetic order.
  49          */
  50
  51         /*
  52          * These bidders are all pretty cheap; they just examine a
  53          * small initial part of the archive.  If one of these bids
  54          * high, we can maybe avoid running any of the more expensive
  55          * bidders below.
  56          */
  57         archive_read_support_format_ar(a);
  58         archive_read_support_format_cpio(a);
  59         archive_read_support_format_empty(a);
  60         archive_read_support_format_lha(a);
  61         archive_read_support_format_mtree(a);
  62         archive_read_support_format_tar(a);
  63         archive_read_support_format_xar(a);
  64         archive_read_support_format_warc(a);
  65
  66         /*
  67          * Install expensive bidders last.  By doing them last, we
  68          * increase the chance that a high bid from someone else will
  69          * make it unnecessary for these to do anything at all.
  70          */
  71         /* These three have potentially large look-ahead. */
  72         archive_read_support_format_7zip(a);
  73         archive_read_support_format_cab(a);
  74         archive_read_support_format_rar(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 }