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Dpkg::Compression - simple database of available compression methods
| Use Case | Command | Description |
|---|---|---|
| Get supported compression methods | compression_get_list() | Returns alphabetically sorted list |
| Check if compression is supported | compression_is_supported($comp) | Returns boolean |
| Get compression property | compression_get_property($comp, $property) | Returns file_ext, default_level, comp_prog, decomp_prog |
| Guess compression from filename | compression_guess_from_filename($filename) | Returns method based on extension |
| Get file extension regex | compression_get_file_extension_regex() | Returns regex for compressed extensions |
| Get default compression | compression_get_default() | Returns "xz" unless changed |
| Set default compression | compression_set_default($comp) | Errors if unsupported |
| Get default compression level | compression_get_default_level() | Returns compressor-specific default |
| Set default compression level | compression_set_default_level($level) | Undef resets to default |
| Validate compression level | compression_is_valid_level($level) | Checks if level is 1-9, "fast", or "best" |
This modules provides a few public functions and a public regex to interact with the set of supported compression methods.
compression_get_list() — Returns a list of supported compression methods (sorted alphabetically).compression_is_supported($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.compression_get_file_extension_regex() — Returns a regex that matches a file extension of a file compressed with one of the supported compression methods.compression_get_default() — Return the default compression method. It is "xz" unless compression_set_default has been used to change it.compression_set_default($comp) — Change the default compression method. Errors out if the given compression method is not supported.compression_get_default_level() — Return the default compression level used when compressing data. It's "9" for "gzip" and "bzip2", "6" for "xz" and "lzma", unless compression_set_default_level has been used to change it.compression_set_default_level($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 $level is a valid compression level (it must be either a number between 1 and 9 or "fast" or "best")$default_compression, $default_compression_level and $compression_re_file_ext.compression_get_file_extension_regex()$default_compression, $default_compression_level and $compression_re_file_ext1.21.1 2025-09-09 Dpkg::Compression(3perl)
Generated by phpman v4.10.0-7-g98e9fd5 Author: Che Dong Under GNU General Public License
2026-09-09 11:36 @2600:1f28:365:80b0:60b0:dfa5:fbc9:9f8f
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