mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-01 12:53:27 +01:00
108 lines
3.5 KiB
Markdown
Executable File
108 lines
3.5 KiB
Markdown
Executable File
brotli(1) -- brotli, unbrotli - compress or decompress files
|
|
================================================================
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
`brotli` [*OPTION|FILE*]...
|
|
|
|
`unbrotli` is equivalent to `brotli --decompress`
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
`brotli` is a generic-purpose lossless compression algorithm that compresses
|
|
data using a combination of a modern variant of the **LZ77** algorithm, Huffman
|
|
coding and 2-nd order context modeling, with a compression ratio comparable to
|
|
the best currently available general-purpose compression methods. It is similar
|
|
in speed with deflate but offers more dense compression.
|
|
|
|
`brotli` command line syntax similar to `gzip (1)` and `zstd (1)`.
|
|
Unlike `gzip (1)`, source files are preserved by default. It is possible to
|
|
remove them after processing by using the `--rm` _option_.
|
|
|
|
Arguments that look like "`--name`" or "`--name=value`" are _options_. Every
|
|
_option_ has a short form "`-x`" or "`-x value`". Multiple short form _options_
|
|
could be coalesced:
|
|
|
|
* "`--decompress --stdout --suffix=.b`" works the same as
|
|
* "`-d -s -S .b`" and
|
|
* "`-dsS .b`"
|
|
|
|
`brotli` has 3 operation modes:
|
|
|
|
* default mode is compression;
|
|
* `--decompress` option activates decompression mode;
|
|
* `--test` option switches to integrity test mode; this option is equivalent to
|
|
"`--decompress --stdout`" except that the decompressed data is discarded
|
|
instead of being written to standard output.
|
|
|
|
Every non-option argument is a _file_ entry. If no _files_ are given or _file_
|
|
is "`-`", `brotli` reads from standard input. All arguments after "`--`" are
|
|
_file_ entries.
|
|
|
|
Unless `--stdout` or `--output` is specified, _files_ are written to a new file
|
|
whose name is derived from the source _file_ name:
|
|
|
|
* when compressing, a suffix is appended to the source filename to
|
|
get the target filename
|
|
* when decompressing, a suffix is removed from the source filename to
|
|
get the target filename
|
|
|
|
Default suffix is `.br`, but it could be specified with `--suffix` option.
|
|
|
|
Conflicting or duplicate _options_ are not allowed.
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
* `-#`:
|
|
compression level (0-9); bigger values cause denser, but slower compression
|
|
* `-c`, `--stdout`:
|
|
write on standard output
|
|
* `-d`, `--decompress`:
|
|
decompress mode
|
|
* `-f`, `--force`:
|
|
force output file overwrite
|
|
* `-h`, `--help`:
|
|
display this help and exit
|
|
* `-j`, `--rm`:
|
|
remove source file(s); `gzip (1)`-like behaviour
|
|
* `-k`, `--keep`:
|
|
keep source file(s); `zstd (1)`-like behaviour
|
|
* `-n`, `--no-copy-stat`:
|
|
do not copy source file(s) attributes
|
|
* `-o FILE`, `--output=FILE`
|
|
output file; valid only if there is a single input entry
|
|
* `-q NUM`, `--quality=NUM`:
|
|
compression level (0-11); bigger values cause denser, but slower compression
|
|
* `-t`, `--test`:
|
|
test file integrity mode
|
|
* `-v`, `--verbose`:
|
|
increase output verbosity
|
|
* `-w NUM`, `--lgwin=NUM`:
|
|
set LZ77 window size (0, 10-24) (default: 22); window size is
|
|
`(2**NUM - 16)`; 0 lets compressor decide over the optimal value; bigger
|
|
windows size improve density; decoder might require up to window size
|
|
memory to operate
|
|
* `-S SUF`, `--suffix=SUF`:
|
|
output file suffix (default: `.br`)
|
|
* `-V`, `--version`:
|
|
display version and exit
|
|
* `-Z`, `--best`:
|
|
use best compression level (default); same as "`-q 11`"
|
|
|
|
SEE ALSO
|
|
--------
|
|
|
|
`brotli` file format is defined in
|
|
[RFC 7932](https://www.ietf.org/rfc/rfc7932.txt).
|
|
|
|
`brotli` is open-sourced under the
|
|
[MIT License](https://opensource.org/licenses/MIT).
|
|
|
|
Mailing list: https://groups.google.com/forum/#!forum/brotli
|
|
|
|
BUGS
|
|
----
|
|
Report bugs at: https://github.com/google/brotli/issues
|