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NAME

       Dpkg::Compression - simple database of available compression methods

DESCRIPTION

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

EXPORTED VARIABLES

       $compression_re_file_ext
           A regex that matches a file extension of a file compressed with one
           of the supported compression methods.

EXPORTED FUNCTIONS

       my @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, "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.

       my $comp = compression_get_default()
           Return the default compression method. It's "gzip" unless
           "compression_set_default" has been used to change it.

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

       my $level = compression_get_default_level()
           Return the default compression level used when compressing data.
           It's "9" unless "compression_set_default_level" has been used to
           change it.

       compression_set_default_level($level)
           Change the default compression level. Errors out if the level is
           not valid (see "compression_is_valid_level").  either a number
           between 1 and 9 or "fast" or "best".

       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")

AUTHOR

       Raphal Hertzog <hertzog@debian.org>.