mirror of
https://github.com/google/brotli.git
synced 2024-11-22 03:30:07 +00:00
a8f5813b84
Documentation: - add note that brotli is a "stream" format, not an archive-like - regenerate .1 with Pandoc Build: - drop legacy "BROTLI_BUILD_PORTABLE" option - drop "BROTLI_SANITIZED" definition Code: - c: comb includes - c/enc: extract encoder state into separate header - c/enc: drop designated q10 codepath - c/enc: dealing better with flushing of empty stream - fix MSVC compilation API: - py: use library version instead of one in version.h - c: add plugable API to report consumed input / produced output - c/java: support "lean" prepared dictionaries (without copy of source)
130 lines
4.6 KiB
Groff
130 lines
4.6 KiB
Groff
.\" Automatically generated by Pandoc 2.7.3
|
|
.\"
|
|
.TH "brotli" "1" "August 14 2021" "brotli 1.0.9" "User Manual"
|
|
.hy
|
|
.SH NAME
|
|
.PP
|
|
brotli(1) -- brotli, unbrotli - compress or decompress files
|
|
.SH SYNOPSIS
|
|
.PP
|
|
\f[B]brotli\f[R] [\f[I]OPTION|FILE\f[R]]\&...
|
|
.PP
|
|
\f[B]unbrotli\f[R] is equivalent to \f[B]brotli --decompress\f[R]
|
|
.SH DESCRIPTION
|
|
.PP
|
|
\f[B]brotli\f[R] is a generic-purpose lossless compression algorithm
|
|
that compresses data using a combination of a modern variant of the
|
|
\f[B]LZ77\f[R] 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.
|
|
.PP
|
|
\f[B]brotli\f[R] command line syntax similar to \f[B]gzip (1)\f[R] and
|
|
\f[B]zstd (1)\f[R].
|
|
Unlike \f[B]gzip (1)\f[R], source files are preserved by default.
|
|
It is possible to remove them after processing by using the
|
|
\f[B]--rm\f[R] \f[I]option\f[R].
|
|
.PP
|
|
Arguments that look like \[lq]\f[B]--name\f[R]\[rq] or
|
|
\[lq]\f[B]--name=value\f[R]\[rq] are \f[I]options\f[R].
|
|
Every \f[I]option\f[R] has a short form \[lq]\f[B]-x\f[R]\[rq] or
|
|
\[lq]\f[B]-x value\f[R]\[rq].
|
|
Multiple short form \f[I]options\f[R] could be coalesced:
|
|
.IP \[bu] 2
|
|
\[lq]\f[B]--decompress --stdout --suffix=.b\f[R]\[rq] works the same as
|
|
.IP \[bu] 2
|
|
\[lq]\f[B]-d -s -S .b\f[R]\[rq] and
|
|
.IP \[bu] 2
|
|
\[lq]\f[B]-dsS .b\f[R]\[rq]
|
|
.PP
|
|
\f[B]brotli\f[R] has 3 operation modes:
|
|
.IP \[bu] 2
|
|
default mode is compression;
|
|
.IP \[bu] 2
|
|
\f[B]--decompress\f[R] option activates decompression mode;
|
|
.IP \[bu] 2
|
|
\f[B]--test\f[R] option switches to integrity test mode; this option is
|
|
equivalent to \[lq]\f[B]--decompress --stdout\f[R]\[rq] except that the
|
|
decompressed data is discarded instead of being written to standard
|
|
output.
|
|
.PP
|
|
Every non-option argument is a \f[I]file\f[R] entry.
|
|
If no \f[I]files\f[R] are given or \f[I]file\f[R] is
|
|
\[lq]\f[B]-\f[R]\[rq], \f[B]brotli\f[R] reads from standard input.
|
|
All arguments after \[lq]\f[B]--\f[R]\[rq] are \f[I]file\f[R] entries.
|
|
.PP
|
|
Unless \f[B]--stdout\f[R] or \f[B]--output\f[R] is specified,
|
|
\f[I]files\f[R] are written to a new file whose name is derived from the
|
|
source \f[I]file\f[R] name:
|
|
.IP \[bu] 2
|
|
when compressing, a suffix is appended to the source filename to get the
|
|
target filename
|
|
.IP \[bu] 2
|
|
when decompressing, a suffix is removed from the source filename to get
|
|
the target filename
|
|
.PP
|
|
Default suffix is \f[B].br\f[R], but it could be specified with
|
|
\f[B]--suffix\f[R] option.
|
|
.PP
|
|
Conflicting or duplicate \f[I]options\f[R] are not allowed.
|
|
.SH OPTIONS
|
|
.IP \[bu] 2
|
|
\f[B]-#\f[R]: compression level (0-9); bigger values cause denser, but
|
|
slower compression
|
|
.IP \[bu] 2
|
|
\f[B]-c\f[R], \f[B]--stdout\f[R]: write on standard output
|
|
.IP \[bu] 2
|
|
\f[B]-d\f[R], \f[B]--decompress\f[R]: decompress mode
|
|
.IP \[bu] 2
|
|
\f[B]-f\f[R], \f[B]--force\f[R]: force output file overwrite
|
|
.IP \[bu] 2
|
|
\f[B]-h\f[R], \f[B]--help\f[R]: display this help and exit
|
|
.IP \[bu] 2
|
|
\f[B]-j\f[R], \f[B]--rm\f[R]: remove source file(s); \f[B]gzip
|
|
(1)\f[R]-like behaviour
|
|
.IP \[bu] 2
|
|
\f[B]-k\f[R], \f[B]--keep\f[R]: keep source file(s); \f[B]zstd
|
|
(1)\f[R]-like behaviour
|
|
.IP \[bu] 2
|
|
\f[B]-n\f[R], \f[B]--no-copy-stat\f[R]: do not copy source file(s)
|
|
attributes
|
|
.IP \[bu] 2
|
|
\f[B]-o FILE\f[R], \f[B]--output=FILE\f[R] output file; valid only if
|
|
there is a single input entry
|
|
.IP \[bu] 2
|
|
\f[B]-q NUM\f[R], \f[B]--quality=NUM\f[R]: compression level (0-11);
|
|
bigger values cause denser, but slower compression
|
|
.IP \[bu] 2
|
|
\f[B]-t\f[R], \f[B]--test\f[R]: test file integrity mode
|
|
.IP \[bu] 2
|
|
\f[B]-v\f[R], \f[B]--verbose\f[R]: increase output verbosity
|
|
.IP \[bu] 2
|
|
\f[B]-w NUM\f[R], \f[B]--lgwin=NUM\f[R]: set LZ77 window size (0, 10-24)
|
|
(default: 24); window size is \f[B](pow(2, NUM) - 16)\f[R]; 0 lets
|
|
compressor decide over the optimal value; bigger windows size improve
|
|
density; decoder might require up to window size memory to operate
|
|
.IP \[bu] 2
|
|
\f[B]-D FILE\f[R], \f[B]--dictionary=FILE\f[R]: use FILE as raw (LZ77)
|
|
dictionary; same dictionary MUST be used both for compression and
|
|
decompression
|
|
.IP \[bu] 2
|
|
\f[B]-S SUF\f[R], \f[B]--suffix=SUF\f[R]: output file suffix (default:
|
|
\f[B].br\f[R])
|
|
.IP \[bu] 2
|
|
\f[B]-V\f[R], \f[B]--version\f[R]: display version and exit
|
|
.IP \[bu] 2
|
|
\f[B]-Z\f[R], \f[B]--best\f[R]: use best compression level (default);
|
|
same as \[lq]\f[B]-q 11\f[R]\[rq]
|
|
.SH SEE ALSO
|
|
.PP
|
|
\f[B]brotli\f[R] file format is defined in RFC
|
|
7932 (https://www.ietf.org/rfc/rfc7932.txt).
|
|
.PP
|
|
\f[B]brotli\f[R] is open-sourced under the MIT
|
|
License (https://opensource.org/licenses/MIT).
|
|
.PP
|
|
Mailing list: https://groups.google.com/forum/#!forum/brotli
|
|
.SH BUGS
|
|
.PP
|
|
Report bugs at: https://github.com/google/brotli/issues
|