Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/hash_longest_match64_inc.h @ 17:dd9cdb856310

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* NOLINT(build/header_guard) */
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2 /* Copyright 2010 Google Inc. All Rights Reserved.
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4 Distributed under MIT license.
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5 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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6 */
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8 /* template parameters: FN */
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10 /* A (forgetful) hash table to the data seen by the compressor, to
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11 help create backward references to previous data.
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13 This is a hash map of fixed size (bucket_size_) to a ring buffer of
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14 fixed size (block_size_). The ring buffer contains the last block_size_
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15 index positions of the given hash key in the compressed data. */
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17 #define HashLongestMatch HASHER()
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19 static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 8; }
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20 static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 8; }
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22 /* HashBytes is the function that chooses the bucket to place the address in. */
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23 static BROTLI_INLINE size_t FN(HashBytes)(const uint8_t* BROTLI_RESTRICT data,
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24 uint64_t hash_mul) {
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25 const uint64_t h = BROTLI_UNALIGNED_LOAD64LE(data) * hash_mul;
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26 /* The higher bits contain more mixture from the multiplication,
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27 so we take our results from there. */
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28 return (size_t)(h >> (64 - 15));
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29 }
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31 typedef struct HashLongestMatch {
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32 /* Number of hash buckets. */
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33 size_t bucket_size_;
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34 /* Only block_size_ newest backward references are kept,
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35 and the older are forgotten. */
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36 size_t block_size_;
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37 /* Hash multiplier tuned to match length. */
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38 uint64_t hash_mul_;
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39 /* Mask for accessing entries in a block (in a ring-buffer manner). */
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40 uint32_t block_mask_;
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42 int block_bits_;
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43 int num_last_distances_to_check_;
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45 /* Shortcuts. */
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46 HasherCommon* common_;
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48 /* --- Dynamic size members --- */
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50 /* Number of entries in a particular bucket. */
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51 uint16_t* num_; /* uint16_t[bucket_size]; */
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53 /* Buckets containing block_size_ of backward references. */
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54 uint32_t* buckets_; /* uint32_t[bucket_size * block_size]; */
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55 } HashLongestMatch;
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57 static void FN(Initialize)(
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58 HasherCommon* common, HashLongestMatch* BROTLI_RESTRICT self,
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59 const BrotliEncoderParams* params) {
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60 self->common_ = common;
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62 BROTLI_UNUSED(params);
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63 self->hash_mul_ = kHashMul64 << (64 - 5 * 8);
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64 BROTLI_DCHECK(common->params.bucket_bits == 15);
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65 self->bucket_size_ = (size_t)1 << common->params.bucket_bits;
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66 self->block_bits_ = common->params.block_bits;
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67 self->block_size_ = (size_t)1 << common->params.block_bits;
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68 self->block_mask_ = (uint32_t)(self->block_size_ - 1);
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69 self->num_last_distances_to_check_ =
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70 common->params.num_last_distances_to_check;
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71 self->num_ = (uint16_t*)common->extra[0];
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72 self->buckets_ = (uint32_t*)common->extra[1];
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73 }
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74
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75 static void FN(Prepare)(
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76 HashLongestMatch* BROTLI_RESTRICT self, BROTLI_BOOL one_shot,
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77 size_t input_size, const uint8_t* BROTLI_RESTRICT data) {
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78 uint16_t* BROTLI_RESTRICT num = self->num_;
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79 /* Partial preparation is 100 times slower (per socket). */
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80 size_t partial_prepare_threshold = self->bucket_size_ >> 6;
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81 if (one_shot && input_size <= partial_prepare_threshold) {
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82 size_t i;
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83 for (i = 0; i < input_size; ++i) {
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84 const size_t key = FN(HashBytes)(&data[i], self->hash_mul_);
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85 num[key] = 0;
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86 }
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87 } else {
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88 memset(num, 0, self->bucket_size_ * sizeof(num[0]));
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89 }
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90 }
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91
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92 static BROTLI_INLINE void FN(HashMemAllocInBytes)(
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93 const BrotliEncoderParams* params, BROTLI_BOOL one_shot,
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94 size_t input_size, size_t* alloc_size) {
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95 size_t bucket_size = (size_t)1 << params->hasher.bucket_bits;
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96 size_t block_size = (size_t)1 << params->hasher.block_bits;
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97 BROTLI_UNUSED(one_shot);
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parents:
diff changeset
98 BROTLI_UNUSED(input_size);
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parents:
diff changeset
99 alloc_size[0] = sizeof(uint16_t) * bucket_size;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 alloc_size[1] = sizeof(uint32_t) * bucket_size * block_size;
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parents:
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101 }
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parents:
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102
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parents:
diff changeset
103 /* Look at 4 bytes at &data[ix & mask].
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
104 Compute a hash from these, and store the value of ix at that position. */
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parents:
diff changeset
105 static BROTLI_INLINE void FN(Store)(
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
106 HashLongestMatch* BROTLI_RESTRICT self, const uint8_t* BROTLI_RESTRICT data,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 const size_t mask, const size_t ix) {
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
108 uint16_t* BROTLI_RESTRICT num = self->num_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 uint32_t* BROTLI_RESTRICT buckets = self->buckets_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 const size_t key = FN(HashBytes)(&data[ix & mask], self->hash_mul_);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 const size_t minor_ix = num[key] & self->block_mask_;
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
112 const size_t offset = minor_ix + (key << self->block_bits_);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 ++num[key];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 buckets[offset] = (uint32_t)ix;
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115 }
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116
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parents:
diff changeset
117 static BROTLI_INLINE void FN(StoreRange)(HashLongestMatch* BROTLI_RESTRICT self,
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parents:
diff changeset
118 const uint8_t* BROTLI_RESTRICT data, const size_t mask,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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119 const size_t ix_start, const size_t ix_end) {
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120 size_t i;
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parents:
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121 for (i = ix_start; i < ix_end; ++i) {
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122 FN(Store)(self, data, mask, i);
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parents:
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123 }
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124 }
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125
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 static BROTLI_INLINE void FN(StitchToPreviousBlock)(
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diff changeset
127 HashLongestMatch* BROTLI_RESTRICT self,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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128 size_t num_bytes, size_t position, const uint8_t* ringbuffer,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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129 size_t ringbuffer_mask) {
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parents:
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130 if (num_bytes >= FN(HashTypeLength)() - 1 && position >= 3) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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131 /* Prepare the hashes for three last bytes of the last write.
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132 These could not be calculated before, since they require knowledge
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parents:
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133 of both the previous and the current block. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 FN(Store)(self, ringbuffer, ringbuffer_mask, position - 3);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 FN(Store)(self, ringbuffer, ringbuffer_mask, position - 2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 FN(Store)(self, ringbuffer, ringbuffer_mask, position - 1);
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Franz Glasner <fzglas.hg@dom66.de>
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137 }
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138 }
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139
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 static BROTLI_INLINE void FN(PrepareDistanceCache)(
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
141 HashLongestMatch* BROTLI_RESTRICT self,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 int* BROTLI_RESTRICT distance_cache) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 PrepareDistanceCache(distance_cache, self->num_last_distances_to_check_);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 }
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parents:
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145
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parents:
diff changeset
146 /* Find a longest backward match of &data[cur_ix] up to the length of
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 max_length and stores the position cur_ix in the hash table.
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148
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149 REQUIRES: FN(PrepareDistanceCache) must be invoked for current distance cache
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parents:
diff changeset
150 values; if this method is invoked repeatedly with the same distance
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parents:
diff changeset
151 cache values, it is enough to invoke FN(PrepareDistanceCache) once.
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parents:
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152
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parents:
diff changeset
153 Does not look for matches longer than max_length.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 Does not look for matches further away than max_backward.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 Writes the best match into |out|.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 |out|->score is updated only if a better match is found. */
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
157 static BROTLI_INLINE void FN(FindLongestMatch)(
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
158 HashLongestMatch* BROTLI_RESTRICT self,
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
159 const BrotliEncoderDictionary* dictionary,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask,
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
161 const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix,
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
162 const size_t max_length, const size_t max_backward,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
163 const size_t dictionary_distance, const size_t max_distance,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 HasherSearchResult* BROTLI_RESTRICT out) {
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
165 uint16_t* BROTLI_RESTRICT num = self->num_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 uint32_t* BROTLI_RESTRICT buckets = self->buckets_;
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
167 const size_t cur_ix_masked = cur_ix & ring_buffer_mask;
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parents:
diff changeset
168 /* Don't accept a short copy from far away. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 score_t min_score = out->score;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 score_t best_score = out->score;
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
171 size_t best_len = out->len;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 size_t i;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 /* Precalculate the hash key and prefetch the bucket. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 const size_t key = FN(HashBytes)(&data[cur_ix_masked], self->hash_mul_);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 uint32_t* BROTLI_RESTRICT bucket = &buckets[key << self->block_bits_];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 PREFETCH_L1(bucket);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 if (self->block_bits_ > 4) PREFETCH_L1(bucket + 16);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 out->len = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 out->len_code_delta = 0;
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parents:
diff changeset
180
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 BROTLI_DCHECK(cur_ix_masked + max_length <= ring_buffer_mask);
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diff changeset
182
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 /* Try last distance first. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 for (i = 0; i < (size_t)self->num_last_distances_to_check_; ++i) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 const size_t backward = (size_t)distance_cache[i];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 size_t prev_ix = (size_t)(cur_ix - backward);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 if (prev_ix >= cur_ix) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 continue;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 if (BROTLI_PREDICT_FALSE(backward > max_backward)) {
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
191 continue;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 }
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
193 prev_ix &= ring_buffer_mask;
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
194
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
195 if (cur_ix_masked + best_len > ring_buffer_mask) {
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
196 break;
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
197 }
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
198 if (prev_ix + best_len > ring_buffer_mask ||
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
199 data[cur_ix_masked + best_len] != data[prev_ix + best_len]) {
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
200 continue;
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
201 }
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
202 {
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
203 const size_t len = FindMatchLengthWithLimit(&data[prev_ix],
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
204 &data[cur_ix_masked],
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
205 max_length);
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
206 if (len >= 3 || (len == 2 && i < 2)) {
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
207 /* Comparing for >= 2 does not change the semantics, but just saves for
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
208 a few unnecessary binary logarithms in backward reference score,
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
209 since we are not interested in such short matches. */
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
210 score_t score = BackwardReferenceScoreUsingLastDistance(len);
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
211 if (best_score < score) {
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
212 if (i != 0) score -= BackwardReferencePenaltyUsingLastDistance(i);
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
213 if (best_score < score) {
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
214 best_score = score;
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
215 best_len = len;
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
216 out->len = best_len;
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
217 out->distance = backward;
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
218 out->score = best_score;
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
219 }
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
220 }
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
221 }
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
222 }
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
223 }
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
224 /* we require matches of len >4, so increase best_len to 3, so we can compare
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
225 * 4 bytes all the time. */
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
226 if (best_len < 3) {
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
227 best_len = 3;
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
228 }
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
229 {
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
230 const size_t down =
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
231 (num[key] > self->block_size_) ?
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
232 (num[key] - self->block_size_) : 0u;
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
233 const uint32_t first4 = BrotliUnalignedRead32(data + cur_ix_masked);
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
234 const size_t max_length_m4 = max_length - 4;
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
235 i = num[key];
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
236 for (; i > down;) {
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
237 size_t prev_ix = bucket[--i & self->block_mask_];
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
238 uint32_t current4;
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
239 const size_t backward = cur_ix - prev_ix;
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
240 if (BROTLI_PREDICT_FALSE(backward > max_backward)) {
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
241 break;
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
242 }
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
243 prev_ix &= ring_buffer_mask;
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
244 if (cur_ix_masked + best_len > ring_buffer_mask) {
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
245 break;
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
246 }
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
247 if (prev_ix + best_len > ring_buffer_mask ||
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
248 /* compare 4 bytes ending at best_len + 1 */
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
249 BrotliUnalignedRead32(&data[cur_ix_masked + best_len - 3]) !=
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
250 BrotliUnalignedRead32(&data[prev_ix + best_len - 3])) {
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
251 continue;
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
252 }
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
253 current4 = BrotliUnalignedRead32(data + prev_ix);
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
254 if (first4 != current4) continue;
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
255 {
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
256 const size_t len = FindMatchLengthWithLimit(&data[prev_ix + 4],
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
257 &data[cur_ix_masked + 4],
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
258 max_length_m4) + 4;
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
259 const score_t score = BackwardReferenceScore(len, backward);
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
260 if (best_score < score) {
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
261 best_score = score;
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
262 best_len = len;
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
263 out->len = best_len;
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
264 out->distance = backward;
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
265 out->score = best_score;
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
266 }
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
267 }
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
268 }
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
269 bucket[num[key] & self->block_mask_] = (uint32_t)cur_ix;
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
270 ++num[key];
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
271 }
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
272 if (min_score == out->score) {
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
273 SearchInStaticDictionary(dictionary,
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
274 self->common_, &data[cur_ix_masked], max_length, dictionary_distance,
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
275 max_distance, out, BROTLI_FALSE);
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
276 }
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
277 }
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
278
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
279 #undef HashLongestMatch