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>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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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 /* Build per-context histograms of literals, commands and distance codes. */
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9 #include "histogram.h"
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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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15 #if defined(__cplusplus) || defined(c_plusplus)
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16 extern "C" {
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17 #endif
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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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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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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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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(&copy_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" */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 #endif