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      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
     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