Mercurial > hgrepos > Python2 > PyMuPDF
annotate mupdf-source/thirdparty/brotli/c/enc/histogram.c @ 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 |
| parents | b50eed0cc0ef |
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| rev | line source |
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1 /* Copyright 2013 Google Inc. All Rights Reserved. |
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2 |
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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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6 |
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7 /* Build per-context histograms of literals, commands and distance codes. */ |
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8 |
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9 #include "histogram.h" |
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10 |
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11 #include "../common/context.h" |
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12 #include "block_splitter.h" |
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13 #include "command.h" |
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14 |
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15 #if defined(__cplusplus) || defined(c_plusplus) |
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16 extern "C" { |
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17 #endif |
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18 |
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19 typedef struct BlockSplitIterator { |
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20 const BlockSplit* split_; /* Not owned. */ |
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21 size_t idx_; |
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22 size_t type_; |
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23 size_t length_; |
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24 } BlockSplitIterator; |
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25 |
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26 static void InitBlockSplitIterator(BlockSplitIterator* self, |
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27 const BlockSplit* split) { |
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28 self->split_ = split; |
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29 self->idx_ = 0; |
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30 self->type_ = 0; |
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31 self->length_ = split->lengths ? split->lengths[0] : 0; |
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32 } |
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33 |
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34 static void BlockSplitIteratorNext(BlockSplitIterator* self) { |
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35 if (self->length_ == 0) { |
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36 ++self->idx_; |
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37 self->type_ = self->split_->types[self->idx_]; |
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38 self->length_ = self->split_->lengths[self->idx_]; |
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39 } |
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40 --self->length_; |
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41 } |
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42 |
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43 void BrotliBuildHistogramsWithContext( |
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44 const Command* cmds, const size_t num_commands, |
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45 const BlockSplit* literal_split, const BlockSplit* insert_and_copy_split, |
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46 const BlockSplit* dist_split, const uint8_t* ringbuffer, size_t start_pos, |
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47 size_t mask, uint8_t prev_byte, uint8_t prev_byte2, |
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48 const ContextType* context_modes, HistogramLiteral* literal_histograms, |
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49 HistogramCommand* insert_and_copy_histograms, |
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50 HistogramDistance* copy_dist_histograms) { |
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51 size_t pos = start_pos; |
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52 BlockSplitIterator literal_it; |
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53 BlockSplitIterator insert_and_copy_it; |
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54 BlockSplitIterator dist_it; |
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55 size_t i; |
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56 |
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57 InitBlockSplitIterator(&literal_it, literal_split); |
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58 InitBlockSplitIterator(&insert_and_copy_it, insert_and_copy_split); |
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59 InitBlockSplitIterator(&dist_it, dist_split); |
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60 for (i = 0; i < num_commands; ++i) { |
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61 const Command* cmd = &cmds[i]; |
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62 size_t j; |
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63 BlockSplitIteratorNext(&insert_and_copy_it); |
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64 HistogramAddCommand(&insert_and_copy_histograms[insert_and_copy_it.type_], |
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65 cmd->cmd_prefix_); |
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66 /* TODO(eustas): unwrap iterator blocks. */ |
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67 for (j = cmd->insert_len_; j != 0; --j) { |
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68 size_t context; |
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69 BlockSplitIteratorNext(&literal_it); |
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70 context = literal_it.type_; |
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71 if (context_modes) { |
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72 ContextLut lut = BROTLI_CONTEXT_LUT(context_modes[context]); |
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73 context = (context << BROTLI_LITERAL_CONTEXT_BITS) + |
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74 BROTLI_CONTEXT(prev_byte, prev_byte2, lut); |
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75 } |
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76 HistogramAddLiteral(&literal_histograms[context], |
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77 ringbuffer[pos & mask]); |
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78 prev_byte2 = prev_byte; |
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79 prev_byte = ringbuffer[pos & mask]; |
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80 ++pos; |
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81 } |
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82 pos += CommandCopyLen(cmd); |
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83 if (CommandCopyLen(cmd)) { |
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84 prev_byte2 = ringbuffer[(pos - 2) & mask]; |
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85 prev_byte = ringbuffer[(pos - 1) & mask]; |
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86 if (cmd->cmd_prefix_ >= 128) { |
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87 size_t context; |
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88 BlockSplitIteratorNext(&dist_it); |
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89 context = (dist_it.type_ << BROTLI_DISTANCE_CONTEXT_BITS) + |
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90 CommandDistanceContext(cmd); |
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91 HistogramAddDistance(©_dist_histograms[context], |
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92 cmd->dist_prefix_ & 0x3FF); |
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93 } |
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94 } |
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95 } |
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96 } |
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97 |
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98 #if defined(__cplusplus) || defined(c_plusplus) |
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99 } /* extern "C" */ |
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100 #endif |
