Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/common/context.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Copyright 2013 Google Inc. All Rights Reserved.
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 /* Lookup table to map the previous two bytes to a context id.
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9 There are four different context modeling modes defined here:
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10 CONTEXT_LSB6: context id is the least significant 6 bits of the last byte,
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11 CONTEXT_MSB6: context id is the most significant 6 bits of the last byte,
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12 CONTEXT_UTF8: second-order context model tuned for UTF8-encoded text,
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13 CONTEXT_SIGNED: second-order context model tuned for signed integers.
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15 If |p1| and |p2| are the previous two bytes, and |mode| is current context
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16 mode, we calculate the context as:
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18 context = ContextLut(mode)[p1] | ContextLut(mode)[p2 + 256].
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20 For CONTEXT_UTF8 mode, if the previous two bytes are ASCII characters
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21 (i.e. < 128), this will be equivalent to
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23 context = 4 * context1(p1) + context2(p2),
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25 where context1 is based on the previous byte in the following way:
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27 0 : non-ASCII control
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28 1 : \t, \n, \r
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29 2 : space
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30 3 : other punctuation
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31 4 : " '
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32 5 : %
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33 6 : ( < [ {
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34 7 : ) > ] }
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35 8 : , ; :
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36 9 : .
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37 10 : =
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38 11 : number
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39 12 : upper-case vowel
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40 13 : upper-case consonant
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41 14 : lower-case vowel
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42 15 : lower-case consonant
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44 and context2 is based on the second last byte:
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46 0 : control, space
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47 1 : punctuation
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48 2 : upper-case letter, number
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49 3 : lower-case letter
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51 If the last byte is ASCII, and the second last byte is not (in a valid UTF8
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52 stream it will be a continuation byte, value between 128 and 191), the
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53 context is the same as if the second last byte was an ASCII control or space.
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54
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55 If the last byte is a UTF8 lead byte (value >= 192), then the next byte will
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56 be a continuation byte and the context id is 2 or 3 depending on the LSB of
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57 the last byte and to a lesser extent on the second last byte if it is ASCII.
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59 If the last byte is a UTF8 continuation byte, the second last byte can be:
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60 - continuation byte: the next byte is probably ASCII or lead byte (assuming
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61 4-byte UTF8 characters are rare) and the context id is 0 or 1.
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62 - lead byte (192 - 207): next byte is ASCII or lead byte, context is 0 or 1
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63 - lead byte (208 - 255): next byte is continuation byte, context is 2 or 3
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64
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65 The possible value combinations of the previous two bytes, the range of
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66 context ids and the type of the next byte is summarized in the table below:
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67
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68 |--------\-----------------------------------------------------------------|
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69 | \ Last byte |
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70 | Second \---------------------------------------------------------------|
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71 | last byte \ ASCII | cont. byte | lead byte |
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72 | \ (0-127) | (128-191) | (192-) |
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73 |=============|===================|=====================|==================|
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74 | ASCII | next: ASCII/lead | not valid | next: cont. |
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75 | (0-127) | context: 4 - 63 | | context: 2 - 3 |
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76 |-------------|-------------------|---------------------|------------------|
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77 | cont. byte | next: ASCII/lead | next: ASCII/lead | next: cont. |
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78 | (128-191) | context: 4 - 63 | context: 0 - 1 | context: 2 - 3 |
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79 |-------------|-------------------|---------------------|------------------|
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80 | lead byte | not valid | next: ASCII/lead | not valid |
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81 | (192-207) | | context: 0 - 1 | |
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82 |-------------|-------------------|---------------------|------------------|
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83 | lead byte | not valid | next: cont. | not valid |
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84 | (208-) | | context: 2 - 3 | |
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85 |-------------|-------------------|---------------------|------------------|
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86 */
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87
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88 #ifndef BROTLI_COMMON_CONTEXT_H_
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89 #define BROTLI_COMMON_CONTEXT_H_
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90
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91 #include <brotli/port.h>
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92 #include <brotli/types.h>
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93
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94 typedef enum ContextType {
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95 CONTEXT_LSB6 = 0,
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96 CONTEXT_MSB6 = 1,
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97 CONTEXT_UTF8 = 2,
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98 CONTEXT_SIGNED = 3
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99 } ContextType;
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100
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101 /* "Soft-private", it is exported, but not "advertised" as API. */
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102 /* Common context lookup table for all context modes. */
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103 BROTLI_COMMON_API extern const uint8_t _kBrotliContextLookupTable[2048];
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104
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105 typedef const uint8_t* ContextLut;
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106
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107 /* typeof(MODE) == ContextType; returns ContextLut */
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108 #define BROTLI_CONTEXT_LUT(MODE) (&_kBrotliContextLookupTable[(MODE) << 9])
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109
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110 /* typeof(LUT) == ContextLut */
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111 #define BROTLI_CONTEXT(P1, P2, LUT) ((LUT)[P1] | ((LUT) + 256)[P2])
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112
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113 #endif /* BROTLI_COMMON_CONTEXT_H_ */