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ARCHIVE_READ_FORMAT(3) BSD Library Functions Manual
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ARCHIVE_READ_FORMAT(3)
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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 — functions for
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reading streaming archives
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LIBRARY
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Streaming Archive Library
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(libarchive, -larchive)
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SYNOPSIS
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#include
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<archive.h>
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int
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archive_read_support_format_7zip(struct archive *);
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int
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archive_read_support_format_all(struct archive *);
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int
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archive_read_support_format_ar(struct archive *);
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int
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archive_read_support_format_by_code(struct archive *,
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int);
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int
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archive_read_support_format_cab(struct archive *);
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int
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archive_read_support_format_cpio(struct archive *);
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int
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archive_read_support_format_empty(struct archive *);
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int
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archive_read_support_format_iso9660(struct archive *);
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int
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archive_read_support_format_lha(struct archive *);
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int
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archive_read_support_format_mtree(struct archive *);
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int
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archive_read_support_format_rar(struct archive *);
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int
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archive_read_support_format_raw(struct archive *);
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int
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archive_read_support_format_tar(struct archive *);
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int
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archive_read_support_format_xar(struct archive *);
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int
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archive_read_support_format_zip(struct archive *);
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DESCRIPTION
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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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Enables support---including
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auto-detection code---for the specified archive format. For
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example, archive_read_support_format_tar() enables
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support for a variety of standard tar formats, old-style
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tar, ustar, pax interchange format, and many common
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variants.
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archive_read_support_format_all()
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Enables support for all
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available formats except the ’’raw’’
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format (see below).
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archive_read_support_format_by_code()
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Enables a single format
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specified by the format code. This can be useful when
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reading a single archive twice; use archive_format()
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after reading the first time and pass the resulting code to
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this function to selectively enable only the necessary
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format support. Note: In statically-linked executables, this
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will cause your program to include support for every format.
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If executable size is a concern, you may wish to avoid using
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this function.
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archive_read_support_format_empty()
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Enables support for treating
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empty files as empty archives. Because empty files are valid
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for several different formats, it is not possible to
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accurately determine a format for an empty file based purely
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on contents. So empty files are treated by libarchive as a
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distinct format.
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archive_read_support_format_raw()
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The
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’’raw’’ format handler allows
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libarchive to be used to read arbitrary data. It treats any
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data stream as an archive with a single entry. The pathname
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of this entry is ’’data’’; all other
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entry fields are unset. This is not enabled by
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archive_read_support_format_all() in order to avoid
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erroneous handling of damaged archives.
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RETURN VALUES
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These functions return
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ARCHIVE_OK on success, or ARCHIVE_FATAL.
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ERRORS
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Detailed error codes and textual
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descriptions are available from the archive_errno()
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and archive_error_string() functions.
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SEE ALSO
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tar(1), libarchive(3),
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archive_read_data(3), archive_read_filter(3),
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archive_read_set_options(3), archive_util(3), tar(5)
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BUGS
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Many traditional archiver
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programs treat empty files as valid empty archives. For
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example, many implementations of tar(1) allow you to append
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entries to an empty file. Of course, it is impossible to
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determine the format of an empty file by inspecting the
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contents, so this library treats empty files as having a
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special ’’empty’’ format.
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Using the
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’’raw’’ handler together with any
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other handler will often work but can produce surprising
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results.
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BSD
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February 2, 2012 BSD
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