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Linux 2.6 - man page for dpkg::compression (linux section 3)

Dpkg::Compression(3)						   libdpkg-perl 					      Dpkg::Compression(3)

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 method. 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
Raphael Hertzog <hertzog@debian.org>. 1.16.0.3 2012-04-17 Dpkg::Compression(3)