phpman > perldoc > Dpkg::Compression(3perl)

NAME
    Dpkg::Compression - simple database of available compression methods

DESCRIPTION
    This modules provides a few public functions and a public regex to interact with the set of
    supported compression methods.

FUNCTIONS
    @list = compression_get_list()
        Returns a list of supported compression methods (sorted alphabetically).

    compression_is_supported($comp)
        Returns a boolean indicating whether the give compression method is known and supported.

    compression_get_property($comp, $property)
        Returns the requested property of the compression method. Returns undef if either the
        property or the compression method doesn't exist. Valid properties currently include
        "file_ext" for the file extension, "default_level" for the default compression level,
        "comp_prog" for the name of the compression program and "decomp_prog" for the name of the
        decompression program.

    compression_guess_from_filename($filename)
        Returns the compression method that is likely used on the indicated filename based on its
        file extension.

    $regex = compression_get_file_extension_regex()
        Returns a regex that matches a file extension of a file compressed with one of the supported
        compression methods.

    $comp = compression_get_default()
        Return the default compression method. It is "xz" unless "compression_set_default" has been
        used to change it.

    compression_set_default($comp)
        Change the default compression method. Errors out if the given compression method is not
        supported.

    $level = compression_get_default_level()
        Return the default compression level used when compressing data. It's "9" for "gzip" and
        "bzip2", "6" for "xz" and "lzma", unless "compression_set_default_level" has been used to
        change it.

    compression_set_default_level($level)
        Change the default compression level. Passing undef as the level will reset it to the
        compressor specific default, otherwise errors out if the level is not valid (see
        "compression_is_valid_level").

    compression_is_valid_level($level)
        Returns a boolean indicating whether $level is a valid compression level (it must be either
        a number between 1 and 9 or "fast" or "best")

CHANGES
  Version 2.00 (dpkg 1.20.0)
    Hide variables: $default_compression, $default_compression_level and $compression_re_file_ext.

  Version 1.02 (dpkg 1.17.2)
    New function: compression_get_file_extension_regex()

    Deprecated variables: $default_compression, $default_compression_level and
    $compression_re_file_ext

  Version 1.01 (dpkg 1.16.1)
    Default compression level is not global any more, it is per compressor type.

  Version 1.00 (dpkg 1.15.6)
    Mark the module as public.