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dependencies/libarchive-3.4.2/doc/wiki/ManPageArchiveReadFormat3.wiki
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dependencies/libarchive-3.4.2/doc/wiki/ManPageArchiveReadFormat3.wiki
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ARCHIVE_READ_FORMAT(3) manual page
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== NAME ==
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'''archive_read_support_format_7zip''',
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'''archive_read_support_format_all''',
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'''archive_read_support_format_ar''',
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'''archive_read_support_format_by_code''',
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'''archive_read_support_format_cab''',
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'''archive_read_support_format_cpio''',
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'''archive_read_support_format_empty''',
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'''archive_read_support_format_iso9660''',
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'''archive_read_support_format_lha''',
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'''archive_read_support_format_mtree''',
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'''archive_read_support_format_rar''',
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'''archive_read_support_format_raw''',
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'''archive_read_support_format_tar''',
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'''archive_read_support_format_xar''',
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'''archive_read_support_format_zip'''
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- functions for reading streaming archives
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== LIBRARY ==
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Streaming Archive Library (libarchive, -larchive)
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== SYNOPSIS ==
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'''<nowiki>#include <archive.h></nowiki>'''
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<br>
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''int''
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<br>
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'''archive_read_support_format_7zip'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_all'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_ar'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_by_code'''(''struct archive *'', ''int'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_cab'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_cpio'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_empty'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_iso9660'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_lha'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_mtree'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_rar'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_raw'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_tar'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_xar'''(''struct archive *'');
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<br>
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''int''
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<br>
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'''archive_read_support_format_zip'''(''struct archive *'');
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== DESCRIPTION ==
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<dl>
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<dt>
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'''archive_read_support_format_7zip'''(),
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'''archive_read_support_format_ar'''(),
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'''archive_read_support_format_cab'''(),
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'''archive_read_support_format_cpio'''(),
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'''archive_read_support_format_iso9660'''(),
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'''archive_read_support_format_lha'''(),
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'''archive_read_support_format_mtree'''(),
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'''archive_read_support_format_rar'''(),
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'''archive_read_support_format_raw'''(),
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'''archive_read_support_format_tar'''(),
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'''archive_read_support_format_xar'''(),
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'''archive_read_support_format_zip'''()
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</dt> <dd>
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Enables support---including auto-detection code---for the
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specified archive format.
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For example,
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'''archive_read_support_format_tar'''()
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enables support for a variety of standard tar formats, old-style tar,
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ustar, pax interchange format, and many common variants.
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</dd><dt>'''archive_read_support_format_all'''()</dt><dd>
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Enables support for all available formats except the
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"raw"
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format (see below).
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</dd><dt>'''archive_read_support_format_by_code'''()</dt><dd>
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Enables a single format specified by the format code.
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This can be useful when reading a single archive twice;
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use
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'''archive_format'''()
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after reading the first time and pass the resulting code
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to this function to selectively enable only the necessary
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format support.
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Note: In statically-linked executables, this will cause
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your program to include support for every format.
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If executable size is a concern, you may wish to avoid
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using this function.
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</dd><dt>'''archive_read_support_format_empty'''()</dt><dd>
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Enables support for treating empty files as empty archives.
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Because empty files are valid for several different formats,
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it is not possible to accurately determine a format for
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an empty file based purely on contents.
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So empty files are treated by libarchive as a distinct
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format.
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</dd><dt>'''archive_read_support_format_raw'''()</dt><dd>
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The
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"raw"
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format handler allows libarchive to be used to read arbitrary data.
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It treats any data stream as an archive with a single entry.
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The pathname of this entry is
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"data ;"
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all other entry fields are unset.
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This is not enabled by
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'''archive_read_support_format_all'''()
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in order to avoid erroneous handling of damaged archives.
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</dd></dl>
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== RETURN VALUES ==
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These functions return
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'''ARCHIVE_OK'''
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on success, or
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'''ARCHIVE_FATAL'''.
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== ERRORS ==
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Detailed error codes and textual descriptions are available from the
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'''archive_errno'''()
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and
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'''archive_error_string'''()
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functions.
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== SEE ALSO ==
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[[ManPageBsdtar1]],
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[[ManPagerchiveeadata3]],
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[[ManPagerchiveeadilter3]],
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[[ManPagerchiveeadetptions3]],
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[[ManPagerchivetil3]],
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[[ManPageibarchive3]],
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[[ManPageTar5]]
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== BUGS ==
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Many traditional archiver programs treat
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empty files as valid empty archives.
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For example, many implementations of
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[[ManPageBsdtar1]]
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allow you to append entries to an empty file.
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Of course, it is impossible to determine the format of an empty file
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by inspecting the contents, so this library treats empty files as
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having a special
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"empty"
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format.
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Using the
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"raw"
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handler together with any other handler will often work
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but can produce surprising results.
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