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Manual Reference Pages  -  DPKG::COMPRESSION (3)

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NAME

Dpkg::Compression - simple database of available compression methods

CONTENTS

DESCRIPTION

This modules provides a few public funcions 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.

AUTHOR

RaphaŽl Hertzog <hertzog@debian.org>.
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1.18.4 DPKG::COMPRESSION (3) 2016-04-03

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