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Dpkg::Compression

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

Raphaël Hertzog <hertzog@debian.org>.