Mercurial > hgrepos > Python2 > PyMuPDF
annotate mupdf-source/thirdparty/brotli/c/tools/brotli.md @ 46:7ee69f120f19 default tip
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
| author | Franz Glasner <fzglas.hg@dom66.de> |
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| date | Sat, 11 Oct 2025 17:17:30 +0200 |
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1 # NAME |
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2 |
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3 brotli(1) -- brotli, brcat, unbrotli - compress or decompress files |
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4 |
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5 # SYNOPSIS |
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6 |
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7 `brotli` [*OPTION|FILE*]... |
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8 |
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9 `brcat` is equivalent to `brotli --decompress --concatenated --stdout` |
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10 |
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11 `unbrotli` is equivalent to `brotli --decompress` |
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12 |
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13 # DESCRIPTION |
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14 |
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15 `brotli` is a generic-purpose lossless compression algorithm that compresses |
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16 data using a combination of a modern variant of the **LZ77** algorithm, Huffman |
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17 coding and 2-nd order context modeling, with a compression ratio comparable to |
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18 the best currently available general-purpose compression methods. It is similar |
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19 in speed with deflate but offers more dense compression. |
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20 |
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21 `brotli` command line syntax similar to `gzip (1)` and `zstd (1)`. |
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22 Unlike `gzip (1)`, source files are preserved by default. It is possible to |
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23 remove them after processing by using the `--rm` _option_. |
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24 |
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25 Arguments that look like "`--name`" or "`--name=value`" are _options_. Every |
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26 _option_ has a short form "`-x`" or "`-x value`". Multiple short form _options_ |
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27 could be coalesced: |
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28 |
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29 * "`--decompress --stdout --suffix=.b`" works the same as |
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30 * "`-d -s -S .b`" and |
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31 * "`-dsS .b`" |
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32 |
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33 `brotli` has 3 operation modes: |
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34 |
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35 * default mode is compression; |
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36 * `--decompress` option activates decompression mode; |
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37 * `--test` option switches to integrity test mode; this option is equivalent to |
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38 "`--decompress --stdout`" except that the decompressed data is discarded |
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39 instead of being written to standard output. |
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40 |
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41 Every non-option argument is a _file_ entry. If no _files_ are given or _file_ |
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42 is "`-`", `brotli` reads from standard input. All arguments after "`--`" are |
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43 _file_ entries. |
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44 |
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45 Unless `--stdout` or `--output` is specified, _files_ are written to a new file |
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46 whose name is derived from the source _file_ name: |
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47 |
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48 * when compressing, a suffix is appended to the source filename to |
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49 get the target filename |
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50 * when decompressing, a suffix is removed from the source filename to |
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51 get the target filename |
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52 |
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53 Default suffix is `.br`, but it could be specified with `--suffix` option. |
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54 |
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55 Conflicting or duplicate _options_ are not allowed. |
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56 |
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57 # OPTIONS |
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58 |
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59 * `-#`: |
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60 compression level (0-9); bigger values cause denser, but slower compression |
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61 * `-c`, `--stdout`: |
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62 write on standard output |
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63 * `-d`, `--decompress`: |
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64 decompress mode |
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65 * `-f`, `--force`: |
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66 force output file overwrite |
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67 * `-h`, `--help`: |
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68 display this help and exit |
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69 * `-j`, `--rm`: |
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70 remove source file(s); `gzip (1)`-like behaviour |
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71 * `-k`, `--keep`: |
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72 keep source file(s); `zstd (1)`-like behaviour |
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73 * `-n`, `--no-copy-stat`: |
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74 do not copy source file(s) attributes |
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75 * `-o FILE`, `--output=FILE` |
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76 output file; valid only if there is a single input entry |
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77 * `-q NUM`, `--quality=NUM`: |
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78 compression level (0-11); bigger values cause denser, but slower compression |
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79 * `-t`, `--test`: |
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80 test file integrity mode |
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81 * `-v`, `--verbose`: |
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82 increase output verbosity |
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83 * `-w NUM`, `--lgwin=NUM`: |
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84 set LZ77 window size (0, 10-24) (default: 24); window size is |
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85 `(pow(2, NUM) - 16)`; 0 lets compressor decide over the optimal value; |
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86 bigger windows size improve density; decoder might require up to window size |
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87 memory to operate |
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88 * `-C B64`, `--comment=B64`: |
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89 set comment; argument is base64-decoded first; |
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90 when decoding: check stream comment; |
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91 when encoding: embed comment (fingerprint) |
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92 * `-D FILE`, `--dictionary=FILE`: |
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93 use FILE as raw (LZ77) dictionary; same dictionary MUST be used both for |
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94 compression and decompression |
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95 * `-K`, `--concatenated`: |
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96 when decoding, allow concatenated brotli streams as input |
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97 * `-S SUF`, `--suffix=SUF`: |
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98 output file suffix (default: `.br`) |
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99 * `-V`, `--version`: |
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100 display version and exit |
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101 * `-Z`, `--best`: |
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102 use best compression level (default); same as "`-q 11`" |
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103 |
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104 # SEE ALSO |
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105 |
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106 `brotli` file format is defined in |
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107 [RFC 7932](https://www.ietf.org/rfc/rfc7932.txt). |
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108 |
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109 `brotli` is open-sourced under the |
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110 [MIT License](https://opensource.org/licenses/MIT). |
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111 |
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112 Mailing list: https://groups.google.com/forum/#!forum/brotli |
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113 |
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114 # BUGS |
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115 |
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116 Report bugs at: https://github.com/google/brotli/issues |
