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?? ..
?? .libs
?? backward_references.c(6.13 KB)
?? backward_references.h(1.18 KB)
?? backward_references.lo(303 B)
?? backward_references_hq.c(35.88 KB)
?? backward_references_hq.h(3.68 KB)
?? backward_references_hq.lo(309 B)
?? backward_references_inc.h(7.99 KB)
?? bit_cost.c(1.39 KB)
?? bit_cost.h(896 B)
?? bit_cost.lo(281 B)
?? bit_cost_inc.h(4.02 KB)
?? block_encoder_inc.h(1.11 KB)
?? block_splitter.c(7.16 KB)
?? block_splitter.h(1.59 KB)
?? block_splitter.lo(293 B)
?? block_splitter_inc.h(18.44 KB)
?? brotli_bit_stream.c(49.72 KB)
?? brotli_bit_stream.h(3.26 KB)
?? brotli_bit_stream.lo(299 B)
?? cluster.c(1.42 KB)
?? cluster.h(997 B)
?? cluster.lo(279 B)
?? cluster_inc.h(11.55 KB)
?? command.c(1 KB)
?? command.h(6.77 KB)
?? command.lo(279 B)
?? compound_dictionary.c(6.5 KB)
?? compound_dictionary.h(2.38 KB)
?? compound_dictionary.lo(303 B)
?? compress_fragment.c(32.1 KB)
?? compress_fragment.h(3.49 KB)
?? compress_fragment.lo(299 B)
?? compress_fragment_two_pass.c(26.18 KB)
?? compress_fragment_two_pass.h(2.79 KB)
?? compress_fragment_two_pass.lo(317 B)
?? dictionary_hash.c(7.75 KB)
?? dictionary_hash.h(1.5 KB)
?? dictionary_hash.lo(295 B)
?? dictionary_hash_inc.h(143.28 KB)
?? encode.c(76.58 KB)
?? encode.lo(277 B)
?? encoder_dict.c(22.83 KB)
?? encoder_dict.h(4.9 KB)
?? encoder_dict.lo(289 B)
?? entropy_encode.c(14.23 KB)
?? entropy_encode.h(3.96 KB)
?? entropy_encode.lo(293 B)
?? entropy_encode_static.h(32.37 KB)
?? fast_log.c(5.9 KB)
?? fast_log.h(1.61 KB)
?? fast_log.lo(281 B)
?? find_match_length.h(2.12 KB)
?? hash.h(23.73 KB)
?? hash_base.h(1.34 KB)
?? hash_composite_inc.h(4.98 KB)
?? hash_forgetful_chain_inc.h(11.05 KB)
?? hash_longest_match64_inc.h(10.41 KB)
?? hash_longest_match64_simd_inc.h(11.56 KB)
?? hash_longest_match_inc.h(10.34 KB)
?? hash_longest_match_quickly_inc.h(9.26 KB)
?? hash_longest_match_simd_inc.h(11.48 KB)
?? hash_rolling_inc.h(7.06 KB)
?? hash_to_binary_tree_inc.h(12.77 KB)
?? histogram.c(3.18 KB)
?? histogram.h(1.77 KB)
?? histogram.lo(283 B)
?? histogram_inc.h(1.37 KB)
?? literal_cost.c(5.74 KB)
?? literal_cost.h(889 B)
?? literal_cost.lo(289 B)
?? matching_tag_mask.h(2.29 KB)
?? memory.c(5.39 KB)
?? memory.h(4.2 KB)
?? memory.lo(277 B)
?? metablock.c(26.07 KB)
?? metablock.h(3.93 KB)
?? metablock.lo(283 B)
?? metablock_inc.h(7.46 KB)
?? params.h(1.14 KB)
?? prefix.h(1.9 KB)
?? quality.h(7.68 KB)
?? ringbuffer.h(5.83 KB)
?? state.h(3.01 KB)
?? static_dict.c(20.39 KB)
?? static_dict.h(1.19 KB)
?? static_dict.lo(287 B)
?? static_dict_lut.c(7.25 KB)
?? static_dict_lut.h(1.55 KB)
?? static_dict_lut.lo(295 B)
?? static_dict_lut_inc.h(457.82 KB)
?? static_init.c(1.74 KB)
?? static_init.h(840 B)
?? static_init.lo(287 B)
?? utf8_util.c(2.22 KB)
?? utf8_util.h(878 B)
?? utf8_util.lo(283 B)
?? write_bits.h(2.77 KB)

Editing: bit_cost_inc.h

/* NOLINT(build/header_guard) */
/* Copyright 2013 Google Inc. All Rights Reserved.

Distributed under MIT license.
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/

/* template parameters: FN */

#define HistogramType FN(Histogram)

double FN(BrotliPopulationCost)(const HistogramType* histogram) {
  static const double kOneSymbolHistogramCost = 12;
  static const double kTwoSymbolHistogramCost = 20;
  static const double kThreeSymbolHistogramCost = 28;
  static const double kFourSymbolHistogramCost = 37;
  const size_t data_size = FN(HistogramDataSize)();
  int count = 0;
  size_t s[5];
  double bits = 0.0;
  size_t i;
  if (histogram->total_count_ == 0) {
    return kOneSymbolHistogramCost;
  }
  for (i = 0; i < data_size; ++i) {
    if (histogram->data_[i] > 0) {
      s[count] = i;
      ++count;
      if (count > 4) break;
    }
  }
  if (count == 1) {
    return kOneSymbolHistogramCost;
  }
  if (count == 2) {
    return (kTwoSymbolHistogramCost + (double)histogram->total_count_);
  }
  if (count == 3) {
    const uint32_t histo0 = histogram->data_[s[0]];
    const uint32_t histo1 = histogram->data_[s[1]];
    const uint32_t histo2 = histogram->data_[s[2]];
    const uint32_t histomax =
        BROTLI_MAX(uint32_t, histo0, BROTLI_MAX(uint32_t, histo1, histo2));
    return (kThreeSymbolHistogramCost +
            2 * (histo0 + histo1 + histo2) - histomax);
  }
  if (count == 4) {
    uint32_t histo[4];
    uint32_t h23;
    uint32_t histomax;
    for (i = 0; i < 4; ++i) {
      histo[i] = histogram->data_[s[i]];
    }
    /* Sort */
    for (i = 0; i < 4; ++i) {
      size_t j;
      for (j = i + 1; j < 4; ++j) {
        if (histo[j] > histo[i]) {
          BROTLI_SWAP(uint32_t, histo, j, i);
        }
      }
    }
    h23 = histo[2] + histo[3];
    histomax = BROTLI_MAX(uint32_t, h23, histo[0]);
    return (kFourSymbolHistogramCost +
            3 * h23 + 2 * (histo[0] + histo[1]) - histomax);
  }

{
    /* In this loop we compute the entropy of the histogram and simultaneously
       build a simplified histogram of the code length codes where we use the
       zero repeat code 17, but we don't use the non-zero repeat code 16. */
    size_t max_depth = 1;
    uint32_t depth_histo[BROTLI_CODE_LENGTH_CODES] = { 0 };
    const double log2total = FastLog2(histogram->total_count_);
    for (i = 0; i < data_size;) {
      if (histogram->data_[i] > 0) {
        /* Compute -log2(P(symbol)) = -log2(count(symbol)/total_count) =
                                    = log2(total_count) - log2(count(symbol)) */
        double log2p = log2total - FastLog2(histogram->data_[i]);
        /* Approximate the bit depth by round(-log2(P(symbol))) */
        size_t depth = (size_t)(log2p + 0.5);
        bits += histogram->data_[i] * log2p;
        if (depth > 15) {
          depth = 15;
        }
        if (depth > max_depth) {
          max_depth = depth;
        }
        ++depth_histo[depth];
        ++i;
      } else {
        /* Compute the run length of zeros and add the appropriate number of 0
           and 17 code length codes to the code length code histogram. */
        uint32_t reps = 1;
        size_t k;
        for (k = i + 1; k < data_size && histogram->data_[k] == 0; ++k) {
          ++reps;
        }
        i += reps;
        if (i == data_size) {
          /* Don't add any cost for the last zero run, since these are encoded
             only implicitly. */
          break;
        }
        if (reps < 3) {
          depth_histo[0] += reps;
        } else {
          reps -= 2;
          while (reps > 0) {
            ++depth_histo[BROTLI_REPEAT_ZERO_CODE_LENGTH];
            /* Add the 3 extra bits for the 17 code length code. */
            bits += 3;
            reps >>= 3;
          }
        }
      }
    }
    /* Add the estimated encoding cost of the code length code histogram. */
    bits += (double)(18 + 2 * max_depth);
    /* Add the entropy of the code length code histogram. */
    bits += BrotliBitsEntropy(depth_histo, BROTLI_CODE_LENGTH_CODES);
  }
  return bits;
}

#undef HistogramType

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Editing: bit_cost_inc.h

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