Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/ringbuffer.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
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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 /* Sliding window over the input data. */
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9 #ifndef BROTLI_ENC_RINGBUFFER_H_
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10 #define BROTLI_ENC_RINGBUFFER_H_
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12 #include <string.h> /* memcpy */
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14 #include <brotli/types.h>
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16 #include "../common/platform.h"
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17 #include "memory.h"
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18 #include "quality.h"
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20 #if defined(__cplusplus) || defined(c_plusplus)
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21 extern "C" {
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22 #endif
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24 /* A RingBuffer(window_bits, tail_bits) contains `1 << window_bits' bytes of
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25 data in a circular manner: writing a byte writes it to:
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26 `position() % (1 << window_bits)'.
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27 For convenience, the RingBuffer array contains another copy of the
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28 first `1 << tail_bits' bytes:
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29 buffer_[i] == buffer_[i + (1 << window_bits)], if i < (1 << tail_bits),
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30 and another copy of the last two bytes:
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31 buffer_[-1] == buffer_[(1 << window_bits) - 1] and
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32 buffer_[-2] == buffer_[(1 << window_bits) - 2]. */
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33 typedef struct RingBuffer {
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34 /* Size of the ring-buffer is (1 << window_bits) + tail_size_. */
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35 const uint32_t size_;
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36 const uint32_t mask_;
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37 const uint32_t tail_size_;
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38 const uint32_t total_size_;
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40 uint32_t cur_size_;
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41 /* Position to write in the ring buffer. */
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42 uint32_t pos_;
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43 /* The actual ring buffer containing the copy of the last two bytes, the data,
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44 and the copy of the beginning as a tail. */
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45 uint8_t* data_;
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46 /* The start of the ring-buffer. */
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47 uint8_t* buffer_;
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48 } RingBuffer;
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49
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50 static BROTLI_INLINE void RingBufferInit(RingBuffer* rb) {
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51 rb->cur_size_ = 0;
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52 rb->pos_ = 0;
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53 rb->data_ = 0;
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54 rb->buffer_ = 0;
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55 }
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57 static BROTLI_INLINE void RingBufferSetup(
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58 const BrotliEncoderParams* params, RingBuffer* rb) {
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59 int window_bits = ComputeRbBits(params);
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60 int tail_bits = params->lgblock;
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61 *(uint32_t*)&rb->size_ = 1u << window_bits;
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62 *(uint32_t*)&rb->mask_ = (1u << window_bits) - 1;
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63 *(uint32_t*)&rb->tail_size_ = 1u << tail_bits;
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64 *(uint32_t*)&rb->total_size_ = rb->size_ + rb->tail_size_;
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65 }
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66
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67 static BROTLI_INLINE void RingBufferFree(MemoryManager* m, RingBuffer* rb) {
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68 BROTLI_FREE(m, rb->data_);
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69 }
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71 /* Allocates or re-allocates data_ to the given length + plus some slack
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72 region before and after. Fills the slack regions with zeros. */
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73 static BROTLI_INLINE void RingBufferInitBuffer(
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74 MemoryManager* m, const uint32_t buflen, RingBuffer* rb) {
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75 static const size_t kSlackForEightByteHashingEverywhere = 7;
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76 uint8_t* new_data = BROTLI_ALLOC(
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77 m, uint8_t, 2 + buflen + kSlackForEightByteHashingEverywhere);
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78 size_t i;
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79 if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(new_data)) return;
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80 if (rb->data_) {
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81 memcpy(new_data, rb->data_,
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82 2 + rb->cur_size_ + kSlackForEightByteHashingEverywhere);
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83 BROTLI_FREE(m, rb->data_);
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84 }
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85 rb->data_ = new_data;
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86 rb->cur_size_ = buflen;
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87 rb->buffer_ = rb->data_ + 2;
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88 rb->buffer_[-2] = rb->buffer_[-1] = 0;
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89 for (i = 0; i < kSlackForEightByteHashingEverywhere; ++i) {
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90 rb->buffer_[rb->cur_size_ + i] = 0;
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91 }
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92 }
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93
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94 static BROTLI_INLINE void RingBufferWriteTail(
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95 const uint8_t* bytes, size_t n, RingBuffer* rb) {
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96 const size_t masked_pos = rb->pos_ & rb->mask_;
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97 if (BROTLI_PREDICT_FALSE(masked_pos < rb->tail_size_)) {
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98 /* Just fill the tail buffer with the beginning data. */
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99 const size_t p = rb->size_ + masked_pos;
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100 memcpy(&rb->buffer_[p], bytes,
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101 BROTLI_MIN(size_t, n, rb->tail_size_ - masked_pos));
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102 }
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103 }
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104
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105 /* Push bytes into the ring buffer. */
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106 static BROTLI_INLINE void RingBufferWrite(
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107 MemoryManager* m, const uint8_t* bytes, size_t n, RingBuffer* rb) {
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108 if (rb->pos_ == 0 && n < rb->tail_size_) {
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109 /* Special case for the first write: to process the first block, we don't
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110 need to allocate the whole ring-buffer and we don't need the tail
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111 either. However, we do this memory usage optimization only if the
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112 first write is less than the tail size, which is also the input block
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113 size, otherwise it is likely that other blocks will follow and we
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114 will need to reallocate to the full size anyway. */
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115 rb->pos_ = (uint32_t)n;
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116 RingBufferInitBuffer(m, rb->pos_, rb);
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117 if (BROTLI_IS_OOM(m)) return;
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118 memcpy(rb->buffer_, bytes, n);
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119 return;
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120 }
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121 if (rb->cur_size_ < rb->total_size_) {
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122 /* Lazily allocate the full buffer. */
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123 RingBufferInitBuffer(m, rb->total_size_, rb);
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124 if (BROTLI_IS_OOM(m)) return;
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125 /* Initialize the last two bytes to zero, so that we don't have to worry
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126 later when we copy the last two bytes to the first two positions. */
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127 rb->buffer_[rb->size_ - 2] = 0;
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128 rb->buffer_[rb->size_ - 1] = 0;
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129 /* Initialize tail; might be touched by "best_len++" optimization when
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130 ring buffer is "full". */
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131 rb->buffer_[rb->size_] = 241;
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132 }
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133 {
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134 const size_t masked_pos = rb->pos_ & rb->mask_;
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135 /* The length of the writes is limited so that we do not need to worry
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136 about a write */
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137 RingBufferWriteTail(bytes, n, rb);
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138 if (BROTLI_PREDICT_TRUE(masked_pos + n <= rb->size_)) {
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139 /* A single write fits. */
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140 memcpy(&rb->buffer_[masked_pos], bytes, n);
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141 } else {
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142 /* Split into two writes.
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143 Copy into the end of the buffer, including the tail buffer. */
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144 memcpy(&rb->buffer_[masked_pos], bytes,
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145 BROTLI_MIN(size_t, n, rb->total_size_ - masked_pos));
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146 /* Copy into the beginning of the buffer */
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147 memcpy(&rb->buffer_[0], bytes + (rb->size_ - masked_pos),
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148 n - (rb->size_ - masked_pos));
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149 }
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150 }
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151 {
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152 BROTLI_BOOL not_first_lap = (rb->pos_ & (1u << 31)) != 0;
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153 uint32_t rb_pos_mask = (1u << 31) - 1;
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154 rb->buffer_[-2] = rb->buffer_[rb->size_ - 2];
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155 rb->buffer_[-1] = rb->buffer_[rb->size_ - 1];
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156 rb->pos_ = (rb->pos_ & rb_pos_mask) + (uint32_t)(n & rb_pos_mask);
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157 if (not_first_lap) {
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158 /* Wrap, but preserve not-a-first-lap feature. */
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159 rb->pos_ |= 1u << 31;
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160 }
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161 }
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162 }
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163
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164 #if defined(__cplusplus) || defined(c_plusplus)
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165 } /* extern "C" */
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166 #endif
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167
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168 #endif /* BROTLI_ENC_RINGBUFFER_H_ */