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

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.

           This function is deprecated, please switch to one of the new
           specialized getters instead.

       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.

       $ext = compression_get_file_extension($comp)
           Return the file extension for the compressor $comp.

       $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 global default compression level used when compressing
           data if it has been set, otherwise the default level for the
           default compressor.

           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 global default compression level. Passing undef as the
           level will reset it to the global default compressor specific
           default, otherwise errors out if the level is not valid (see
           "compression_is_valid_level").

       $level = compression_get_level($comp)
           Return the compression level used when compressing data with a
           specific compressor. The value returned is the specific compression
           level if it has been set, otherwise the global default compression
           level if it has been set, falling back to the specific default
           compression level.

       compression_set_level($comp, $level)
           Change the compression level for a specific compressor. Passing
           undef as the level will reset it to the specific default compressor
           level, 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")

       $threads = compression_get_threads()
           Return the number of threads to use for compression and
           decompression.

       compression_set_threads($threads)
           Change the threads to use for compression and decompression.
           Passing "undef" or 0 requests to use automatic mode, based on the
           current CPU cores on the system.

       @exec = compression_get_cmdline_compress($comp)
           Returns a list ready to be passed to "exec", its first element is
           the program name for compression and the following elements are
           parameters for the program.

           When executed the program will act as a filter between its standard
           input and its standard output.

       @exec = compression_get_cmdline_decompress($comp)
           Returns a list ready to be passed to "exec", its first element is
           the program name for decompression and the following elements are
           parameters for the program.

           When executed the program will act as a filter between its standard
           input and its standard output.

CHANGES
   Version 2.01 (dpkg 1.21.14)
       New functions: compression_get_file_extension(),
       compression_get_level(), compression_set_level(),
       compression_get_cmdline_compress(),
       compression_get_cmdline_decompress(), compression_get_threads() and
       compression_set_threads().

       Deprecated functions: compression_get_property().

   Version 2.00 (dpkg 1.20.0)
       Hide variables: $default_compression, $default_compression_level and
       $compression_re_file_ext.

   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.

1.21.22                           2023-05-11          Dpkg::Compression(3perl)

Czas wygenerowania: 0.00030 sek.

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