annotate mupdf-source/thirdparty/brotli/c/enc/backward_references_hq.h @ 17:dd9cdb856310

Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +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 /* Function to find backward reference copies. */
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9 #ifndef BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_
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10 #define BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_
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12 #include <brotli/types.h>
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14 #include "../common/constants.h"
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15 #include "../common/context.h"
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16 #include "../common/dictionary.h"
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17 #include "../common/platform.h"
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18 #include "command.h"
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19 #include "hash.h"
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20 #include "memory.h"
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21 #include "quality.h"
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23 #if defined(__cplusplus) || defined(c_plusplus)
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24 extern "C" {
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25 #endif
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27 BROTLI_INTERNAL void BrotliCreateZopfliBackwardReferences(MemoryManager* m,
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28 size_t num_bytes,
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29 size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
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30 ContextLut literal_context_lut, const BrotliEncoderParams* params,
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31 Hasher* hasher, int* dist_cache, size_t* last_insert_len,
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32 Command* commands, size_t* num_commands, size_t* num_literals);
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34 BROTLI_INTERNAL void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m,
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35 size_t num_bytes,
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36 size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
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37 ContextLut literal_context_lut, const BrotliEncoderParams* params,
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38 Hasher* hasher, int* dist_cache, size_t* last_insert_len,
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39 Command* commands, size_t* num_commands, size_t* num_literals);
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41 typedef struct ZopfliNode {
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42 /* Best length to get up to this byte (not including this byte itself)
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43 highest 7 bit is used to reconstruct the length code. */
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44 uint32_t length;
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45 /* Distance associated with the length. */
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46 uint32_t distance;
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47 /* Number of literal inserts before this copy; highest 5 bits contain
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48 distance short code + 1 (or zero if no short code). */
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49 uint32_t dcode_insert_length;
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51 /* This union holds information used by dynamic-programming. During forward
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52 pass |cost| it used to store the goal function. When node is processed its
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53 |cost| is invalidated in favor of |shortcut|. On path back-tracing pass
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54 |next| is assigned the offset to next node on the path. */
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55 union {
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56 /* Smallest cost to get to this byte from the beginning, as found so far. */
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57 float cost;
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58 /* Offset to the next node on the path. Equals to command_length() of the
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59 next node on the path. For last node equals to BROTLI_UINT32_MAX */
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60 uint32_t next;
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61 /* Node position that provides next distance for distance cache. */
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62 uint32_t shortcut;
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63 } u;
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64 } ZopfliNode;
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65
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66 BROTLI_INTERNAL void BrotliInitZopfliNodes(ZopfliNode* array, size_t length);
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67
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68 /* Computes the shortest path of commands from position to at most
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69 position + num_bytes.
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71 On return, path->size() is the number of commands found and path[i] is the
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72 length of the i-th command (copy length plus insert length).
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73 Note that the sum of the lengths of all commands can be less than num_bytes.
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74
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75 On return, the nodes[0..num_bytes] array will have the following
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76 "ZopfliNode array invariant":
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77 For each i in [1..num_bytes], if nodes[i].cost < kInfinity, then
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78 (1) nodes[i].copy_length() >= 2
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79 (2) nodes[i].command_length() <= i and
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80 (3) nodes[i - nodes[i].command_length()].cost < kInfinity */
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81 BROTLI_INTERNAL size_t BrotliZopfliComputeShortestPath(
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82 MemoryManager* m, size_t num_bytes,
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83 size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
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84 ContextLut literal_context_lut, const BrotliEncoderParams* params,
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85 const int* dist_cache, Hasher* hasher, ZopfliNode* nodes);
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86
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87 BROTLI_INTERNAL void BrotliZopfliCreateCommands(
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88 const size_t num_bytes, const size_t block_start, const ZopfliNode* nodes,
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89 int* dist_cache, size_t* last_insert_len, const BrotliEncoderParams* params,
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90 Command* commands, size_t* num_literals);
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91
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92 #if defined(__cplusplus) || defined(c_plusplus)
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93 } /* extern "C" */
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94 #endif
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95
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96 #endif /* BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_ */