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 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.