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.
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, $property)
- Returns the requested property of the compression method. Returns undef if
either the property or the compression method doesn't exist. Valid
properties currently include "file_ext" for the file extension,
"default_level" for the default compression level,
"comp_prog" for the name of the compression program and
"decomp_prog" for the name of the decompression program.
- compression_guess_from_filename($filename)
- Returns the compression method that is likely used on the indicated
filename based on its file extension.
- my $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.
- 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 $level = compression_get_default_level()
- Return the default compression level used when compressing data. It's
"9" for "gzip" and "bzip2", "6"
for "xz" and "lzma", unless
"compression_set_default_level" has been used to change it.
- compression_set_default_level($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¶
New function:
compression_get_file_extension_regex()
Deprecated variables: $default_compression, $default_compression_level and
$compression_re_file_ext
Version 1.01¶
Default compression level is not global any more, it is per compressor type.
Version 1.00¶
Mark the module as public.
AUTHOR¶
Raphaël Hertzog <hertzog@debian.org>.