Update brotli to v1.0.0-snapshot.

third_party/brotli/enc/brotli_bit_stream.cc

Index: third_party/brotli/enc/brotli_bit_stream.cc
diff --git a/third_party/brotli/enc/brotli_bit_stream.cc b/third_party/brotli/enc/brotli_bit_stream.cc
deleted file mode 100644
index 43f12107af9935e31d1b2c2703b76d260aea40d8..0000000000000000000000000000000000000000
--- a/third_party/brotli/enc/brotli_bit_stream.cc
+++ /dev/null
@@ -1,1181 +0,0 @@
-/* Copyright 2014 Google Inc. All Rights Reserved.
-
-   Distributed under MIT license.
-   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
-*/
-
-// Brotli bit stream functions to support the low level format. There are no
-// compression algorithms here, just the right ordering of bits to match the
-// specs.
-
-#include "./brotli_bit_stream.h"
-
-#include <algorithm>
-#include <cstdlib>  /* free, malloc */
-#include <cstring>
-#include <limits>
-#include <vector>
-
-#include "./bit_cost.h"
-#include "./context.h"
-#include "./entropy_encode.h"
-#include "./entropy_encode_static.h"
-#include "./fast_log.h"
-#include "./prefix.h"
-#include "./write_bits.h"
-
-namespace brotli {
-
-namespace {
-
-static const size_t kMaxHuffmanTreeSize = 2 * kNumCommandPrefixes + 1;
-// Context map alphabet has 256 context id symbols plus max 16 rle symbols.
-static const size_t kContextMapAlphabetSize = 256 + 16;
-// Block type alphabet has 256 block id symbols plus 2 special symbols.
-static const size_t kBlockTypeAlphabetSize = 256 + 2;
-
-// nibblesbits represents the 2 bits to encode MNIBBLES (0-3)
-// REQUIRES: length > 0
-// REQUIRES: length <= (1 << 24)
-void EncodeMlen(size_t length, uint64_t* bits,
-                size_t* numbits, uint64_t* nibblesbits) {
-  assert(length > 0);
-  assert(length <= (1 << 24));
-  length--;  // MLEN - 1 is encoded
-  size_t lg = length == 0 ? 1 : Log2FloorNonZero(
-      static_cast<uint32_t>(length)) + 1;
-  assert(lg <= 24);
-  size_t mnibbles = (lg < 16 ? 16 : (lg + 3)) / 4;
-  *nibblesbits = mnibbles - 4;
-  *numbits = mnibbles * 4;
-  *bits = length;
-}
-
-static inline void StoreCommandExtra(
-    const Command& cmd, size_t* storage_ix, uint8_t* storage) {
-  uint32_t copylen_code = cmd.copy_len_code();
-  uint16_t inscode = GetInsertLengthCode(cmd.insert_len_);
-  uint16_t copycode = GetCopyLengthCode(copylen_code);
-  uint32_t insnumextra = GetInsertExtra(inscode);
-  uint64_t insextraval = cmd.insert_len_ - GetInsertBase(inscode);
-  uint64_t copyextraval = copylen_code - GetCopyBase(copycode);
-  uint64_t bits = (copyextraval << insnumextra) | insextraval;
-  WriteBits(insnumextra + GetCopyExtra(copycode), bits, storage_ix, storage);
-}
-
-}  // namespace
-
-void StoreVarLenUint8(size_t n, size_t* storage_ix, uint8_t* storage) {
-  if (n == 0) {
-    WriteBits(1, 0, storage_ix, storage);
-  } else {
-    WriteBits(1, 1, storage_ix, storage);
-    size_t nbits = Log2FloorNonZero(n);
-    WriteBits(3, nbits, storage_ix, storage);
-    WriteBits(nbits, n - (1 << nbits), storage_ix, storage);
-  }
-}
-
-void StoreCompressedMetaBlockHeader(bool final_block,
-                                    size_t length,
-                                    size_t* storage_ix,
-                                    uint8_t* storage) {
-  // Write ISLAST bit.
-  WriteBits(1, final_block, storage_ix, storage);
-  // Write ISEMPTY bit.
-  if (final_block) {
-    WriteBits(1, 0, storage_ix, storage);
-  }
-
-  uint64_t lenbits;
-  size_t nlenbits;
-  uint64_t nibblesbits;
-  EncodeMlen(length, &lenbits, &nlenbits, &nibblesbits);
-  WriteBits(2, nibblesbits, storage_ix, storage);
-  WriteBits(nlenbits, lenbits, storage_ix, storage);
-
-  if (!final_block) {
-    // Write ISUNCOMPRESSED bit.
-    WriteBits(1, 0, storage_ix, storage);
-  }
-}
-
-void StoreUncompressedMetaBlockHeader(size_t length,
-                                      size_t* storage_ix,
-                                      uint8_t* storage) {
-  // Write ISLAST bit. Uncompressed block cannot be the last one, so set to 0.
-  WriteBits(1, 0, storage_ix, storage);
-  uint64_t lenbits;
-  size_t nlenbits;
-  uint64_t nibblesbits;
-  EncodeMlen(length, &lenbits, &nlenbits, &nibblesbits);
-  WriteBits(2, nibblesbits, storage_ix, storage);
-  WriteBits(nlenbits, lenbits, storage_ix, storage);
-  // Write ISUNCOMPRESSED bit.
-  WriteBits(1, 1, storage_ix, storage);
-}
-
-void StoreHuffmanTreeOfHuffmanTreeToBitMask(
-    const int num_codes,
-    const uint8_t *code_length_bitdepth,
-    size_t *storage_ix,
-    uint8_t *storage) {
-  static const uint8_t kStorageOrder[kCodeLengthCodes] = {
-    1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15
-  };
-  // The bit lengths of the Huffman code over the code length alphabet
-  // are compressed with the following static Huffman code:
-  //   Symbol   Code
-  //   ------   ----
-  //   0          00
-  //   1        1110
-  //   2         110
-  //   3          01
-  //   4          10
-  //   5        1111
-  static const uint8_t kHuffmanBitLengthHuffmanCodeSymbols[6] = {
-     0, 7, 3, 2, 1, 15
-  };
-  static const uint8_t kHuffmanBitLengthHuffmanCodeBitLengths[6] = {
-    2, 4, 3, 2, 2, 4
-  };
-
-  // Throw away trailing zeros:
-  size_t codes_to_store = kCodeLengthCodes;
-  if (num_codes > 1) {
-    for (; codes_to_store > 0; --codes_to_store) {
-      if (code_length_bitdepth[kStorageOrder[codes_to_store - 1]] != 0) {
-        break;
-      }
-    }
-  }
-  size_t skip_some = 0;  // skips none.
-  if (code_length_bitdepth[kStorageOrder[0]] == 0 &&
-      code_length_bitdepth[kStorageOrder[1]] == 0) {
-    skip_some = 2;  // skips two.
-    if (code_length_bitdepth[kStorageOrder[2]] == 0) {
-      skip_some = 3;  // skips three.
-    }
-  }
-  WriteBits(2, skip_some, storage_ix, storage);
-  for (size_t i = skip_some; i < codes_to_store; ++i) {
-    size_t l = code_length_bitdepth[kStorageOrder[i]];
-    WriteBits(kHuffmanBitLengthHuffmanCodeBitLengths[l],
-              kHuffmanBitLengthHuffmanCodeSymbols[l], storage_ix, storage);
-  }
-}
-
-static void StoreHuffmanTreeToBitMask(
-    const size_t huffman_tree_size,
-    const uint8_t* huffman_tree,
-    const uint8_t* huffman_tree_extra_bits,
-    const uint8_t* code_length_bitdepth,
-    const uint16_t* code_length_bitdepth_symbols,
-    size_t * __restrict storage_ix,
-    uint8_t * __restrict storage) {
-  for (size_t i = 0; i < huffman_tree_size; ++i) {
-    size_t ix = huffman_tree[i];
-    WriteBits(code_length_bitdepth[ix], code_length_bitdepth_symbols[ix],
-              storage_ix, storage);
-    // Extra bits
-    switch (ix) {
-      case 16:
-        WriteBits(2, huffman_tree_extra_bits[i], storage_ix, storage);
-        break;
-      case 17:
-        WriteBits(3, huffman_tree_extra_bits[i], storage_ix, storage);
-        break;
-    }
-  }
-}
-
-static void StoreSimpleHuffmanTree(const uint8_t* depths,
-                                   size_t symbols[4],
-                                   size_t num_symbols,
-                                   size_t max_bits,
-                                   size_t *storage_ix, uint8_t *storage) {
-  // value of 1 indicates a simple Huffman code
-  WriteBits(2, 1, storage_ix, storage);
-  WriteBits(2, num_symbols - 1, storage_ix, storage);  // NSYM - 1
-
-  // Sort
-  for (size_t i = 0; i < num_symbols; i++) {
-    for (size_t j = i + 1; j < num_symbols; j++) {
-      if (depths[symbols[j]] < depths[symbols[i]]) {
-        std::swap(symbols[j], symbols[i]);
-      }
-    }
-  }
-
-  if (num_symbols == 2) {
-    WriteBits(max_bits, symbols[0], storage_ix, storage);
-    WriteBits(max_bits, symbols[1], storage_ix, storage);
-  } else if (num_symbols == 3) {
-    WriteBits(max_bits, symbols[0], storage_ix, storage);
-    WriteBits(max_bits, symbols[1], storage_ix, storage);
-    WriteBits(max_bits, symbols[2], storage_ix, storage);
-  } else {
-    WriteBits(max_bits, symbols[0], storage_ix, storage);
-    WriteBits(max_bits, symbols[1], storage_ix, storage);
-    WriteBits(max_bits, symbols[2], storage_ix, storage);
-    WriteBits(max_bits, symbols[3], storage_ix, storage);
-    // tree-select
-    WriteBits(1, depths[symbols[0]] == 1 ? 1 : 0, storage_ix, storage);
-  }
-}
-
-// num = alphabet size
-// depths = symbol depths
-void StoreHuffmanTree(const uint8_t* depths, size_t num,
-                      HuffmanTree* tree,
-                      size_t *storage_ix, uint8_t *storage) {
-  // Write the Huffman tree into the brotli-representation.
-  // The command alphabet is the largest, so this allocation will fit all
-  // alphabets.
-  assert(num <= kNumCommandPrefixes);
-  uint8_t huffman_tree[kNumCommandPrefixes];
-  uint8_t huffman_tree_extra_bits[kNumCommandPrefixes];
-  size_t huffman_tree_size = 0;
-  WriteHuffmanTree(depths, num, &huffman_tree_size, huffman_tree,
-                   huffman_tree_extra_bits);
-
-  // Calculate the statistics of the Huffman tree in brotli-representation.
-  uint32_t huffman_tree_histogram[kCodeLengthCodes] = { 0 };
-  for (size_t i = 0; i < huffman_tree_size; ++i) {
-    ++huffman_tree_histogram[huffman_tree[i]];
-  }
-
-  int num_codes = 0;
-  int code = 0;
-  for (int i = 0; i < kCodeLengthCodes; ++i) {
-    if (huffman_tree_histogram[i]) {
-      if (num_codes == 0) {
-        code = i;
-        num_codes = 1;
-      } else if (num_codes == 1) {
-        num_codes = 2;
-        break;
-      }
-    }
-  }
-
-  // Calculate another Huffman tree to use for compressing both the
-  // earlier Huffman tree with.
-  uint8_t code_length_bitdepth[kCodeLengthCodes] = { 0 };
-  uint16_t code_length_bitdepth_symbols[kCodeLengthCodes] = { 0 };
-  CreateHuffmanTree(&huffman_tree_histogram[0], kCodeLengthCodes,
-                    5, tree, &code_length_bitdepth[0]);
-  ConvertBitDepthsToSymbols(code_length_bitdepth, kCodeLengthCodes,
-                            &code_length_bitdepth_symbols[0]);
-
-  // Now, we have all the data, let's start storing it
-  StoreHuffmanTreeOfHuffmanTreeToBitMask(num_codes, code_length_bitdepth,
-                                         storage_ix, storage);
-
-  if (num_codes == 1) {
-    code_length_bitdepth[code] = 0;
-  }
-
-  // Store the real huffman tree now.
-  StoreHuffmanTreeToBitMask(huffman_tree_size,
-                            huffman_tree,
-                            huffman_tree_extra_bits,
-                            &code_length_bitdepth[0],
-                            code_length_bitdepth_symbols,
-                            storage_ix, storage);
-}
-
-void BuildAndStoreHuffmanTree(const uint32_t *histogram,
-                              const size_t length,
-                              HuffmanTree* tree,
-                              uint8_t* depth,
-                              uint16_t* bits,
-                              size_t* storage_ix,
-                              uint8_t* storage) {
-  size_t count = 0;
-  size_t s4[4] = { 0 };
-  for (size_t i = 0; i < length; i++) {
-    if (histogram[i]) {
-      if (count < 4) {
-        s4[count] = i;
-      } else if (count > 4) {
-        break;
-      }
-      count++;
-    }
-  }
-
-  size_t max_bits_counter = length - 1;
-  size_t max_bits = 0;
-  while (max_bits_counter) {
-    max_bits_counter >>= 1;
-    ++max_bits;
-  }
-
-  if (count <= 1) {
-    WriteBits(4, 1, storage_ix, storage);
-    WriteBits(max_bits, s4[0], storage_ix, storage);
-    return;
-  }
-
-  CreateHuffmanTree(histogram, length, 15, tree, depth);
-  ConvertBitDepthsToSymbols(depth, length, bits);
-
-  if (count <= 4) {
-    StoreSimpleHuffmanTree(depth, s4, count, max_bits, storage_ix, storage);
-  } else {
-    StoreHuffmanTree(depth, length, tree, storage_ix, storage);
-  }
-}
-
-static inline bool SortHuffmanTree(const HuffmanTree& v0,
-                                   const HuffmanTree& v1) {
-  return v0.total_count_ < v1.total_count_;
-}
-
-void BuildAndStoreHuffmanTreeFast(const uint32_t *histogram,
-                                  const size_t histogram_total,
-                                  const size_t max_bits,
-                                  uint8_t* depth,
-                                  uint16_t* bits,
-                                  size_t* storage_ix,
-                                  uint8_t* storage) {
-  size_t count = 0;
-  size_t symbols[4] = { 0 };
-  size_t length = 0;
-  size_t total = histogram_total;
-  while (total != 0) {
-    if (histogram[length]) {
-      if (count < 4) {
-        symbols[count] = length;
-      }
-      ++count;
-      total -= histogram[length];
-    }
-    ++length;
-  }
-
-  if (count <= 1) {
-    WriteBits(4, 1, storage_ix, storage);
-    WriteBits(max_bits, symbols[0], storage_ix, storage);
-    return;
-  }
-
-  const size_t max_tree_size = 2 * length + 1;
-  HuffmanTree* const tree =
-      static_cast<HuffmanTree*>(malloc(max_tree_size * sizeof(HuffmanTree)));
-  for (uint32_t count_limit = 1; ; count_limit *= 2) {
-    HuffmanTree* node = tree;
-    for (size_t i = length; i != 0;) {
-      --i;
-      if (histogram[i]) {
-        if (PREDICT_TRUE(histogram[i] >= count_limit)) {
-          *node = HuffmanTree(histogram[i], -1, static_cast<int16_t>(i));
-        } else {
-          *node = HuffmanTree(count_limit, -1, static_cast<int16_t>(i));
-        }
-        ++node;
-      }
-    }
-    const int n = static_cast<int>(node - tree);
-    std::sort(tree, node, SortHuffmanTree);
-    // The nodes are:
-    // [0, n): the sorted leaf nodes that we start with.
-    // [n]: we add a sentinel here.
-    // [n + 1, 2n): new parent nodes are added here, starting from
-    //              (n+1). These are naturally in ascending order.
-    // [2n]: we add a sentinel at the end as well.
-    // There will be (2n+1) elements at the end.
-    const HuffmanTree sentinel(std::numeric_limits<int>::max(), -1, -1);
-    *node++ = sentinel;
-    *node++ = sentinel;
-
-    int i = 0;      // Points to the next leaf node.
-    int j = n + 1;  // Points to the next non-leaf node.
-    for (int k = n - 1; k > 0; --k) {
-      int left, right;
-      if (tree[i].total_count_ <= tree[j].total_count_) {
-        left = i;
-        ++i;
-      } else {
-        left = j;
-        ++j;
-      }
-      if (tree[i].total_count_ <= tree[j].total_count_) {
-        right = i;
-        ++i;
-      } else {
-        right = j;
-        ++j;
-      }
-      // The sentinel node becomes the parent node.
-      node[-1].total_count_ =
-          tree[left].total_count_ + tree[right].total_count_;
-      node[-1].index_left_ = static_cast<int16_t>(left);
-      node[-1].index_right_or_value_ = static_cast<int16_t>(right);
-      // Add back the last sentinel node.
-      *node++ = sentinel;
-    }
-    SetDepth(tree[2 * n - 1], &tree[0], depth, 0);
-    // We need to pack the Huffman tree in 14 bits.
-    // If this was not successful, add fake entities to the lowest values
-    // and retry.
-    if (PREDICT_TRUE(*std::max_element(&depth[0], &depth[length]) <= 14)) {
-      break;
-    }
-  }
-  free(tree);
-  ConvertBitDepthsToSymbols(depth, length, bits);
-  if (count <= 4) {
-    // value of 1 indicates a simple Huffman code
-    WriteBits(2, 1, storage_ix, storage);
-    WriteBits(2, count - 1, storage_ix, storage);  // NSYM - 1
-
-    // Sort
-    for (size_t i = 0; i < count; i++) {
-      for (size_t j = i + 1; j < count; j++) {
-        if (depth[symbols[j]] < depth[symbols[i]]) {
-          std::swap(symbols[j], symbols[i]);
-        }
-      }
-    }
-
-    if (count == 2) {
-      WriteBits(max_bits, symbols[0], storage_ix, storage);
-      WriteBits(max_bits, symbols[1], storage_ix, storage);
-    } else if (count == 3) {
-      WriteBits(max_bits, symbols[0], storage_ix, storage);
-      WriteBits(max_bits, symbols[1], storage_ix, storage);
-      WriteBits(max_bits, symbols[2], storage_ix, storage);
-    } else {
-      WriteBits(max_bits, symbols[0], storage_ix, storage);
-      WriteBits(max_bits, symbols[1], storage_ix, storage);
-      WriteBits(max_bits, symbols[2], storage_ix, storage);
-      WriteBits(max_bits, symbols[3], storage_ix, storage);
-      // tree-select
-      WriteBits(1, depth[symbols[0]] == 1 ? 1 : 0, storage_ix, storage);
-    }
-  } else {
-    // Complex Huffman Tree
-    StoreStaticCodeLengthCode(storage_ix, storage);
-
-    // Actual rle coding.
-    uint8_t previous_value = 8;
-    for (size_t i = 0; i < length;) {
-      const uint8_t value = depth[i];
-      size_t reps = 1;
-      for (size_t k = i + 1; k < length && depth[k] == value; ++k) {
-        ++reps;
-      }
-      i += reps;
-      if (value == 0) {
-        WriteBits(kZeroRepsDepth[reps], kZeroRepsBits[reps],
-                  storage_ix, storage);
-      } else {
-        if (previous_value != value) {
-          WriteBits(kCodeLengthDepth[value], kCodeLengthBits[value],
-                    storage_ix, storage);
-          --reps;
-        }
-        if (reps < 3) {
-          while (reps != 0) {
-            reps--;
-            WriteBits(kCodeLengthDepth[value], kCodeLengthBits[value],
-                      storage_ix, storage);
-          }
-        } else {
-          reps -= 3;
-          WriteBits(kNonZeroRepsDepth[reps], kNonZeroRepsBits[reps],
-                    storage_ix, storage);
-        }
-        previous_value = value;
-      }
-    }
-  }
-}
-
-static size_t IndexOf(const uint8_t* v, size_t v_size, uint8_t value) {
-  size_t i = 0;
-  for (; i < v_size; ++i) {
-    if (v[i] == value) return i;
-  }
-  return i;
-}
-
-static void MoveToFront(uint8_t* v, size_t index) {
-  uint8_t value = v[index];
-  for (size_t i = index; i != 0; --i) {
-    v[i] = v[i - 1];
-  }
-  v[0] = value;
-}
-
-static void MoveToFrontTransform(const uint32_t* __restrict v_in,
-                                 const size_t v_size,
-                                 uint32_t* v_out) {
-  if (v_size == 0) {
-    return;
-  }
-  uint32_t max_value = *std::max_element(v_in, v_in + v_size);
-  assert(max_value < 256u);
-  uint8_t mtf[256];
-  size_t mtf_size = max_value + 1;
-  for (uint32_t i = 0; i <= max_value; ++i) {
-    mtf[i] = static_cast<uint8_t>(i);
-  }
-  for (size_t i = 0; i < v_size; ++i) {
-    size_t index = IndexOf(mtf, mtf_size, static_cast<uint8_t>(v_in[i]));
-    assert(index < mtf_size);
-    v_out[i] = static_cast<uint32_t>(index);
-    MoveToFront(mtf, index);
-  }
-}
-
-// Finds runs of zeros in v[0..in_size) and replaces them with a prefix code of
-// the run length plus extra bits (lower 9 bits is the prefix code and the rest
-// are the extra bits). Non-zero values in v[] are shifted by
-// *max_length_prefix. Will not create prefix codes bigger than the initial
-// value of *max_run_length_prefix. The prefix code of run length L is simply
-// Log2Floor(L) and the number of extra bits is the same as the prefix code.
-static void RunLengthCodeZeros(const size_t in_size,
-                               uint32_t* __restrict v,
-                               size_t* __restrict out_size,
-                               uint32_t* __restrict max_run_length_prefix) {
-  uint32_t max_reps = 0;
-  for (size_t i = 0; i < in_size;) {
-    for (; i < in_size && v[i] != 0; ++i) ;
-    uint32_t reps = 0;
-    for (; i < in_size && v[i] == 0; ++i) {
-      ++reps;
-    }
-    max_reps = std::max(reps, max_reps);
-  }
-  uint32_t max_prefix = max_reps > 0 ? Log2FloorNonZero(max_reps) : 0;
-  max_prefix = std::min(max_prefix, *max_run_length_prefix);
-  *max_run_length_prefix = max_prefix;
-  *out_size = 0;
-  for (size_t i = 0; i < in_size;) {
-    assert(*out_size <= i);
-    if (v[i] != 0) {
-      v[*out_size] = v[i] + *max_run_length_prefix;
-      ++i;
-      ++(*out_size);
-    } else {
-      uint32_t reps = 1;
-      for (size_t k = i + 1; k < in_size && v[k] == 0; ++k) {
-        ++reps;
-      }
-      i += reps;
-      while (reps != 0) {
-        if (reps < (2u << max_prefix)) {
-          uint32_t run_length_prefix = Log2FloorNonZero(reps);
-          const uint32_t extra_bits = reps - (1u << run_length_prefix);
-          v[*out_size] = run_length_prefix + (extra_bits << 9);
-          ++(*out_size);
-          break;
-        } else {
-          const uint32_t extra_bits = (1u << max_prefix) - 1u;
-          v[*out_size] = max_prefix + (extra_bits << 9);
-          reps -= (2u << max_prefix) - 1u;
-          ++(*out_size);
-        }
-      }
-    }
-  }
-}
-
-void EncodeContextMap(const std::vector<uint32_t>& context_map,
-                      size_t num_clusters,
-                      HuffmanTree* tree,
-                      size_t* storage_ix, uint8_t* storage) {
-  StoreVarLenUint8(num_clusters - 1, storage_ix, storage);
-
-  if (num_clusters == 1) {
-    return;
-  }
-
-  uint32_t* rle_symbols = new uint32_t[context_map.size()];
-  MoveToFrontTransform(&context_map[0], context_map.size(), rle_symbols);
-  uint32_t max_run_length_prefix = 6;
-  size_t num_rle_symbols = 0;
-  RunLengthCodeZeros(context_map.size(), rle_symbols,
-                     &num_rle_symbols, &max_run_length_prefix);
-  uint32_t histogram[kContextMapAlphabetSize];
-  memset(histogram, 0, sizeof(histogram));
-  static const int kSymbolBits = 9;
-  static const uint32_t kSymbolMask = (1u << kSymbolBits) - 1u;
-  for (size_t i = 0; i < num_rle_symbols; ++i) {
-    ++histogram[rle_symbols[i] & kSymbolMask];
-  }
-  bool use_rle = max_run_length_prefix > 0;
-  WriteBits(1, use_rle, storage_ix, storage);
-  if (use_rle) {
-    WriteBits(4, max_run_length_prefix - 1, storage_ix, storage);
-  }
-  uint8_t depths[kContextMapAlphabetSize];
-  uint16_t bits[kContextMapAlphabetSize];
-  memset(depths, 0, sizeof(depths));
-  memset(bits, 0, sizeof(bits));
-  BuildAndStoreHuffmanTree(histogram, num_clusters + max_run_length_prefix,
-                           tree, depths, bits, storage_ix, storage);
-  for (size_t i = 0; i < num_rle_symbols; ++i) {
-    const uint32_t rle_symbol = rle_symbols[i] & kSymbolMask;
-    const uint32_t extra_bits_val = rle_symbols[i] >> kSymbolBits;
-    WriteBits(depths[rle_symbol], bits[rle_symbol], storage_ix, storage);
-    if (rle_symbol > 0 && rle_symbol <= max_run_length_prefix) {
-      WriteBits(rle_symbol, extra_bits_val, storage_ix, storage);
-    }
-  }
-  WriteBits(1, 1, storage_ix, storage);  // use move-to-front
-  delete[] rle_symbols;
-}
-
-void StoreBlockSwitch(const BlockSplitCode& code,
-                      const size_t block_ix,
-                      size_t* storage_ix,
-                      uint8_t* storage) {
-  if (block_ix > 0) {
-    size_t typecode = code.type_code[block_ix];
-    WriteBits(code.type_depths[typecode], code.type_bits[typecode],
-              storage_ix, storage);
-  }
-  size_t lencode = code.length_prefix[block_ix];
-  WriteBits(code.length_depths[lencode], code.length_bits[lencode],
-            storage_ix, storage);
-  WriteBits(code.length_nextra[block_ix], code.length_extra[block_ix],
-            storage_ix, storage);
-}
-
-static void BuildAndStoreBlockSplitCode(const std::vector<uint8_t>& types,
-                                        const std::vector<uint32_t>& lengths,
-                                        const size_t num_types,
-                                        HuffmanTree* tree,
-                                        BlockSplitCode* code,
-                                        size_t* storage_ix,
-                                        uint8_t* storage) {
-  const size_t num_blocks = types.size();
-  uint32_t type_histo[kBlockTypeAlphabetSize];
-  uint32_t length_histo[kNumBlockLenPrefixes];
-  memset(type_histo, 0, (num_types + 2) * sizeof(type_histo[0]));
-  memset(length_histo, 0, sizeof(length_histo));
-  size_t last_type = 1;
-  size_t second_last_type = 0;
-  code->type_code.resize(num_blocks);
-  code->length_prefix.resize(num_blocks);
-  code->length_nextra.resize(num_blocks);
-  code->length_extra.resize(num_blocks);
-  code->type_depths.resize(num_types + 2);
-  code->type_bits.resize(num_types + 2);
-  memset(code->length_depths, 0, sizeof(code->length_depths));
-  memset(code->length_bits, 0, sizeof(code->length_bits));
-  for (size_t i = 0; i < num_blocks; ++i) {
-    size_t type = types[i];
-    size_t type_code = (type == last_type + 1 ? 1 :
-                     type == second_last_type ? 0 :
-                     type + 2);
-    second_last_type = last_type;
-    last_type = type;
-    code->type_code[i] = static_cast<uint32_t>(type_code);
-    if (i != 0) ++type_histo[type_code];
-    GetBlockLengthPrefixCode(lengths[i],
-                             &code->length_prefix[i],
-                             &code->length_nextra[i],
-                             &code->length_extra[i]);
-    ++length_histo[code->length_prefix[i]];
-  }
-  StoreVarLenUint8(num_types - 1, storage_ix, storage);
-  if (num_types > 1) {
-    BuildAndStoreHuffmanTree(&type_histo[0], num_types + 2, tree,
-                             &code->type_depths[0], &code->type_bits[0],
-                             storage_ix, storage);
-    BuildAndStoreHuffmanTree(&length_histo[0], kNumBlockLenPrefixes, tree,
-                             &code->length_depths[0], &code->length_bits[0],
-                             storage_ix, storage);
-    StoreBlockSwitch(*code, 0, storage_ix, storage);
-  }
-}
-
-void StoreTrivialContextMap(size_t num_types,
-                            size_t context_bits,
-                            HuffmanTree* tree,
-                            size_t* storage_ix,
-                            uint8_t* storage) {
-  StoreVarLenUint8(num_types - 1, storage_ix, storage);
-  if (num_types > 1) {
-    size_t repeat_code = context_bits - 1u;
-    size_t repeat_bits = (1u << repeat_code) - 1u;
-    size_t alphabet_size = num_types + repeat_code;
-    uint32_t histogram[kContextMapAlphabetSize];
-    uint8_t depths[kContextMapAlphabetSize];
-    uint16_t bits[kContextMapAlphabetSize];
-    memset(histogram, 0, alphabet_size * sizeof(histogram[0]));
-    memset(depths, 0, alphabet_size * sizeof(depths[0]));
-    memset(bits, 0, alphabet_size * sizeof(bits[0]));
-    // Write RLEMAX.
-    WriteBits(1, 1, storage_ix, storage);
-    WriteBits(4, repeat_code - 1, storage_ix, storage);
-    histogram[repeat_code] = static_cast<uint32_t>(num_types);
-    histogram[0] = 1;
-    for (size_t i = context_bits; i < alphabet_size; ++i) {
-      histogram[i] = 1;
-    }
-    BuildAndStoreHuffmanTree(&histogram[0], alphabet_size, tree,
-                             &depths[0], &bits[0],
-                             storage_ix, storage);
-    for (size_t i = 0; i < num_types; ++i) {
-      size_t code = (i == 0 ? 0 : i + context_bits - 1);
-      WriteBits(depths[code], bits[code], storage_ix, storage);
-      WriteBits(depths[repeat_code], bits[repeat_code], storage_ix, storage);
-      WriteBits(repeat_code, repeat_bits, storage_ix, storage);
-    }
-    // Write IMTF (inverse-move-to-front) bit.
-    WriteBits(1, 1, storage_ix, storage);
-  }
-}
-
-// Manages the encoding of one block category (literal, command or distance).
-class BlockEncoder {
- public:
-  BlockEncoder(size_t alphabet_size,
-               size_t num_block_types,
-               const std::vector<uint8_t>& block_types,
-               const std::vector<uint32_t>& block_lengths)
-      : alphabet_size_(alphabet_size),
-        num_block_types_(num_block_types),
-        block_types_(block_types),
-        block_lengths_(block_lengths),
-        block_ix_(0),
-        block_len_(block_lengths.empty() ? 0 : block_lengths[0]),
-        entropy_ix_(0) {}
-
-  // Creates entropy codes of block lengths and block types and stores them
-  // to the bit stream.
-  void BuildAndStoreBlockSwitchEntropyCodes(HuffmanTree* tree,
-                                            size_t* storage_ix,
-                                            uint8_t* storage) {
-    BuildAndStoreBlockSplitCode(
-        block_types_, block_lengths_, num_block_types_,
-        tree, &block_split_code_, storage_ix, storage);
-  }
-
-  // Creates entropy codes for all block types and stores them to the bit
-  // stream.
-  template<int kSize>
-  void BuildAndStoreEntropyCodes(
-      const std::vector<Histogram<kSize> >& histograms,
-      HuffmanTree* tree,
-      size_t* storage_ix, uint8_t* storage) {
-    depths_.resize(histograms.size() * alphabet_size_);
-    bits_.resize(histograms.size() * alphabet_size_);
-    for (size_t i = 0; i < histograms.size(); ++i) {
-      size_t ix = i * alphabet_size_;
-      BuildAndStoreHuffmanTree(&histograms[i].data_[0], alphabet_size_,
-                               tree,
-                               &depths_[ix], &bits_[ix],
-                               storage_ix, storage);
-    }
-  }
-
-  // Stores the next symbol with the entropy code of the current block type.
-  // Updates the block type and block length at block boundaries.
-  void StoreSymbol(size_t symbol, size_t* storage_ix, uint8_t* storage) {
-    if (block_len_ == 0) {
-      ++block_ix_;
-      block_len_ = block_lengths_[block_ix_];
-      entropy_ix_ = block_types_[block_ix_] * alphabet_size_;
-      StoreBlockSwitch(block_split_code_, block_ix_, storage_ix, storage);
-    }
-    --block_len_;
-    size_t ix = entropy_ix_ + symbol;
-    WriteBits(depths_[ix], bits_[ix], storage_ix, storage);
-  }
-
-  // Stores the next symbol with the entropy code of the current block type and
-  // context value.
-  // Updates the block type and block length at block boundaries.
-  template<int kContextBits>
-  void StoreSymbolWithContext(size_t symbol, size_t context,
-                              const std::vector<uint32_t>& context_map,
-                              size_t* storage_ix, uint8_t* storage) {
-    if (block_len_ == 0) {
-      ++block_ix_;
-      block_len_ = block_lengths_[block_ix_];
-      size_t block_type = block_types_[block_ix_];
-      entropy_ix_ = block_type << kContextBits;
-      StoreBlockSwitch(block_split_code_, block_ix_, storage_ix, storage);
-    }
-    --block_len_;
-    size_t histo_ix = context_map[entropy_ix_ + context];
-    size_t ix = histo_ix * alphabet_size_ + symbol;
-    WriteBits(depths_[ix], bits_[ix], storage_ix, storage);
-  }
-
- private:
-  const size_t alphabet_size_;
-  const size_t num_block_types_;
-  const std::vector<uint8_t>& block_types_;
-  const std::vector<uint32_t>& block_lengths_;
-  BlockSplitCode block_split_code_;
-  size_t block_ix_;
-  size_t block_len_;
-  size_t entropy_ix_;
-  std::vector<uint8_t> depths_;
-  std::vector<uint16_t> bits_;
-};
-
-static void JumpToByteBoundary(size_t* storage_ix, uint8_t* storage) {
-  *storage_ix = (*storage_ix + 7u) & ~7u;
-  storage[*storage_ix >> 3] = 0;
-}
-
-void StoreMetaBlock(const uint8_t* input,
-                    size_t start_pos,
-                    size_t length,
-                    size_t mask,
-                    uint8_t prev_byte,
-                    uint8_t prev_byte2,
-                    bool is_last,
-                    uint32_t num_direct_distance_codes,
-                    uint32_t distance_postfix_bits,
-                    ContextType literal_context_mode,
-                    const brotli::Command *commands,
-                    size_t n_commands,
-                    const MetaBlockSplit& mb,
-                    size_t *storage_ix,
-                    uint8_t *storage) {
-  StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage);
-
-  size_t num_distance_codes =
-      kNumDistanceShortCodes + num_direct_distance_codes +
-      (48u << distance_postfix_bits);
-
-  HuffmanTree* tree = static_cast<HuffmanTree*>(
-      malloc(kMaxHuffmanTreeSize * sizeof(HuffmanTree)));
-  BlockEncoder literal_enc(256,
-                           mb.literal_split.num_types,
-                           mb.literal_split.types,
-                           mb.literal_split.lengths);
-  BlockEncoder command_enc(kNumCommandPrefixes,
-                           mb.command_split.num_types,
-                           mb.command_split.types,
-                           mb.command_split.lengths);
-  BlockEncoder distance_enc(num_distance_codes,
-                            mb.distance_split.num_types,
-                            mb.distance_split.types,
-                            mb.distance_split.lengths);
-
-  literal_enc.BuildAndStoreBlockSwitchEntropyCodes(tree, storage_ix, storage);
-  command_enc.BuildAndStoreBlockSwitchEntropyCodes(tree, storage_ix, storage);
-  distance_enc.BuildAndStoreBlockSwitchEntropyCodes(tree, storage_ix, storage);
-
-  WriteBits(2, distance_postfix_bits, storage_ix, storage);
-  WriteBits(4, num_direct_distance_codes >> distance_postfix_bits,
-            storage_ix, storage);
-  for (size_t i = 0; i < mb.literal_split.num_types; ++i) {
-    WriteBits(2, literal_context_mode, storage_ix, storage);
-  }
-
-  size_t num_literal_histograms = mb.literal_histograms.size();
-  if (mb.literal_context_map.empty()) {
-    StoreTrivialContextMap(num_literal_histograms, kLiteralContextBits, tree,
-                           storage_ix, storage);
-  } else {
-    EncodeContextMap(mb.literal_context_map, num_literal_histograms, tree,
-                     storage_ix, storage);
-  }
-
-  size_t num_dist_histograms = mb.distance_histograms.size();
-  if (mb.distance_context_map.empty()) {
-    StoreTrivialContextMap(num_dist_histograms, kDistanceContextBits, tree,
-                           storage_ix, storage);
-  } else {
-    EncodeContextMap(mb.distance_context_map, num_dist_histograms, tree,
-                     storage_ix, storage);
-  }
-
-  literal_enc.BuildAndStoreEntropyCodes(mb.literal_histograms, tree,
-                                        storage_ix, storage);
-  command_enc.BuildAndStoreEntropyCodes(mb.command_histograms, tree,
-                                        storage_ix, storage);
-  distance_enc.BuildAndStoreEntropyCodes(mb.distance_histograms, tree,
-                                         storage_ix, storage);
-  free(tree);
-
-  size_t pos = start_pos;
-  for (size_t i = 0; i < n_commands; ++i) {
-    const Command cmd = commands[i];
-    size_t cmd_code = cmd.cmd_prefix_;
-    command_enc.StoreSymbol(cmd_code, storage_ix, storage);
-    StoreCommandExtra(cmd, storage_ix, storage);
-    if (mb.literal_context_map.empty()) {
-      for (size_t j = cmd.insert_len_; j != 0; --j) {
-        literal_enc.StoreSymbol(input[pos & mask], storage_ix, storage);
-        ++pos;
-      }
-    } else {
-      for (size_t j = cmd.insert_len_; j != 0; --j) {
-        size_t context = Context(prev_byte, prev_byte2, literal_context_mode);
-        uint8_t literal = input[pos & mask];
-        literal_enc.StoreSymbolWithContext<kLiteralContextBits>(
-            literal, context, mb.literal_context_map, storage_ix, storage);
-        prev_byte2 = prev_byte;
-        prev_byte = literal;
-        ++pos;
-      }
-    }
-    pos += cmd.copy_len();
-    if (cmd.copy_len()) {
-      prev_byte2 = input[(pos - 2) & mask];
-      prev_byte = input[(pos - 1) & mask];
-      if (cmd.cmd_prefix_ >= 128) {
-        size_t dist_code = cmd.dist_prefix_;
-        uint32_t distnumextra = cmd.dist_extra_ >> 24;
-        uint64_t distextra = cmd.dist_extra_ & 0xffffff;
-        if (mb.distance_context_map.empty()) {
-          distance_enc.StoreSymbol(dist_code, storage_ix, storage);
-        } else {
-          size_t context = cmd.DistanceContext();
-          distance_enc.StoreSymbolWithContext<kDistanceContextBits>(
-              dist_code, context, mb.distance_context_map, storage_ix, storage);
-        }
-        brotli::WriteBits(distnumextra, distextra, storage_ix, storage);
-      }
-    }
-  }
-  if (is_last) {
-    JumpToByteBoundary(storage_ix, storage);
-  }
-}
-
-static void BuildHistograms(const uint8_t* input,
-                            size_t start_pos,
-                            size_t mask,
-                            const brotli::Command *commands,
-                            size_t n_commands,
-                            HistogramLiteral* lit_histo,
-                            HistogramCommand* cmd_histo,
-                            HistogramDistance* dist_histo) {
-  size_t pos = start_pos;
-  for (size_t i = 0; i < n_commands; ++i) {
-    const Command cmd = commands[i];
-    cmd_histo->Add(cmd.cmd_prefix_);
-    for (size_t j = cmd.insert_len_; j != 0; --j) {
-      lit_histo->Add(input[pos & mask]);
-      ++pos;
-    }
-    pos += cmd.copy_len();
-    if (cmd.copy_len() && cmd.cmd_prefix_ >= 128) {
-      dist_histo->Add(cmd.dist_prefix_);
-    }
-  }
-}
-
-static void StoreDataWithHuffmanCodes(const uint8_t* input,
-                                      size_t start_pos,
-                                      size_t mask,
-                                      const brotli::Command *commands,
-                                      size_t n_commands,
-                                      const uint8_t* lit_depth,
-                                      const uint16_t* lit_bits,
-                                      const uint8_t* cmd_depth,
-                                      const uint16_t* cmd_bits,
-                                      const uint8_t* dist_depth,
-                                      const uint16_t* dist_bits,
-                                      size_t* storage_ix,
-                                      uint8_t* storage) {
-  size_t pos = start_pos;
-  for (size_t i = 0; i < n_commands; ++i) {
-    const Command cmd = commands[i];
-    const size_t cmd_code = cmd.cmd_prefix_;
-    WriteBits(cmd_depth[cmd_code], cmd_bits[cmd_code], storage_ix, storage);
-    StoreCommandExtra(cmd, storage_ix, storage);
-    for (size_t j = cmd.insert_len_; j != 0; --j) {
-      const uint8_t literal = input[pos & mask];
-      WriteBits(lit_depth[literal], lit_bits[literal], storage_ix, storage);
-      ++pos;
-    }
-    pos += cmd.copy_len();
-    if (cmd.copy_len() && cmd.cmd_prefix_ >= 128) {
-      const size_t dist_code = cmd.dist_prefix_;
-      const uint32_t distnumextra = cmd.dist_extra_ >> 24;
-      const uint32_t distextra = cmd.dist_extra_ & 0xffffff;
-      WriteBits(dist_depth[dist_code], dist_bits[dist_code],
-                storage_ix, storage);
-      WriteBits(distnumextra, distextra, storage_ix, storage);
-    }
-  }
-}
-
-void StoreMetaBlockTrivial(const uint8_t* input,
-                           size_t start_pos,
-                           size_t length,
-                           size_t mask,
-                           bool is_last,
-                           const brotli::Command *commands,
-                           size_t n_commands,
-                           size_t *storage_ix,
-                           uint8_t *storage) {
-  StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage);
-
-  HistogramLiteral lit_histo;
-  HistogramCommand cmd_histo;
-  HistogramDistance dist_histo;
-
-  BuildHistograms(input, start_pos, mask, commands, n_commands,
-                  &lit_histo, &cmd_histo, &dist_histo);
-
-  WriteBits(13, 0, storage_ix, storage);
-
-  std::vector<uint8_t> lit_depth(256);
-  std::vector<uint16_t> lit_bits(256);
-  std::vector<uint8_t> cmd_depth(kNumCommandPrefixes);
-  std::vector<uint16_t> cmd_bits(kNumCommandPrefixes);
-  std::vector<uint8_t> dist_depth(64);
-  std::vector<uint16_t> dist_bits(64);
-
-  HuffmanTree* tree = static_cast<HuffmanTree*>(
-      malloc(kMaxHuffmanTreeSize * sizeof(HuffmanTree)));
-  BuildAndStoreHuffmanTree(&lit_histo.data_[0], 256, tree,
-                           &lit_depth[0], &lit_bits[0],
-                           storage_ix, storage);
-  BuildAndStoreHuffmanTree(&cmd_histo.data_[0], kNumCommandPrefixes, tree,
-                           &cmd_depth[0], &cmd_bits[0],
-                           storage_ix, storage);
-  BuildAndStoreHuffmanTree(&dist_histo.data_[0], 64, tree,
-                           &dist_depth[0], &dist_bits[0],
-                           storage_ix, storage);
-  free(tree);
-  StoreDataWithHuffmanCodes(input, start_pos, mask, commands,
-                            n_commands, &lit_depth[0], &lit_bits[0],
-                            &cmd_depth[0], &cmd_bits[0],
-                            &dist_depth[0], &dist_bits[0],
-                            storage_ix, storage);
-  if (is_last) {
-    JumpToByteBoundary(storage_ix, storage);
-  }
-}
-
-void StoreMetaBlockFast(const uint8_t* input,
-                        size_t start_pos,
-                        size_t length,
-                        size_t mask,
-                        bool is_last,
-                        const brotli::Command *commands,
-                        size_t n_commands,
-                        size_t *storage_ix,
-                        uint8_t *storage) {
-  StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage);
-
-  WriteBits(13, 0, storage_ix, storage);
-
-  if (n_commands <= 128) {
-    uint32_t histogram[256] = { 0 };
-    size_t pos = start_pos;
-    size_t num_literals = 0;
-    for (size_t i = 0; i < n_commands; ++i) {
-      const Command cmd = commands[i];
-      for (size_t j = cmd.insert_len_; j != 0; --j) {
-        ++histogram[input[pos & mask]];
-        ++pos;
-      }
-      num_literals += cmd.insert_len_;
-      pos += cmd.copy_len();
-    }
-    uint8_t lit_depth[256] = { 0 };
-    uint16_t lit_bits[256] = { 0 };
-    BuildAndStoreHuffmanTreeFast(histogram, num_literals,
-                                 /* max_bits = */ 8,
-                                 lit_depth, lit_bits,
-                                 storage_ix, storage);
-    StoreStaticCommandHuffmanTree(storage_ix, storage);
-    StoreStaticDistanceHuffmanTree(storage_ix, storage);
-    StoreDataWithHuffmanCodes(input, start_pos, mask, commands,
-                              n_commands, &lit_depth[0], &lit_bits[0],
-                              kStaticCommandCodeDepth,
-                              kStaticCommandCodeBits,
-                              kStaticDistanceCodeDepth,
-                              kStaticDistanceCodeBits,
-                              storage_ix, storage);
-  } else {
-    HistogramLiteral lit_histo;
-    HistogramCommand cmd_histo;
-    HistogramDistance dist_histo;
-    BuildHistograms(input, start_pos, mask, commands, n_commands,
-                    &lit_histo, &cmd_histo, &dist_histo);
-    std::vector<uint8_t> lit_depth(256);
-    std::vector<uint16_t> lit_bits(256);
-    std::vector<uint8_t> cmd_depth(kNumCommandPrefixes);
-    std::vector<uint16_t> cmd_bits(kNumCommandPrefixes);
-    std::vector<uint8_t> dist_depth(64);
-    std::vector<uint16_t> dist_bits(64);
-    BuildAndStoreHuffmanTreeFast(&lit_histo.data_[0], lit_histo.total_count_,
-                                 /* max_bits = */ 8,
-                                 &lit_depth[0], &lit_bits[0],
-                                 storage_ix, storage);
-    BuildAndStoreHuffmanTreeFast(&cmd_histo.data_[0], cmd_histo.total_count_,
-                                 /* max_bits = */ 10,
-                                 &cmd_depth[0], &cmd_bits[0],
-                                 storage_ix, storage);
-    BuildAndStoreHuffmanTreeFast(&dist_histo.data_[0], dist_histo.total_count_,
-                                 /* max_bits = */ 6,
-                                 &dist_depth[0], &dist_bits[0],
-                                 storage_ix, storage);
-    StoreDataWithHuffmanCodes(input, start_pos, mask, commands,
-                              n_commands, &lit_depth[0], &lit_bits[0],
-                              &cmd_depth[0], &cmd_bits[0],
-                              &dist_depth[0], &dist_bits[0],
-                              storage_ix, storage);
-  }
-
-  if (is_last) {
-    JumpToByteBoundary(storage_ix, storage);
-  }
-}
-
-// This is for storing uncompressed blocks (simple raw storage of
-// bytes-as-bytes).
-void StoreUncompressedMetaBlock(bool final_block,
-                                const uint8_t * __restrict input,
-                                size_t position, size_t mask,
-                                size_t len,
-                                size_t * __restrict storage_ix,
-                                uint8_t * __restrict storage) {
-  StoreUncompressedMetaBlockHeader(len, storage_ix, storage);
-  JumpToByteBoundary(storage_ix, storage);
-
-  size_t masked_pos = position & mask;
-  if (masked_pos + len > mask + 1) {
-    size_t len1 = mask + 1 - masked_pos;
-    memcpy(&storage[*storage_ix >> 3], &input[masked_pos], len1);
-    *storage_ix += len1 << 3;
-    len -= len1;
-    masked_pos = 0;
-  }
-  memcpy(&storage[*storage_ix >> 3], &input[masked_pos], len);
-  *storage_ix += len << 3;
-
-  // We need to clear the next 4 bytes to continue to be
-  // compatible with WriteBits.
-  brotli::WriteBitsPrepareStorage(*storage_ix, storage);
-
-  // Since the uncompressed block itself may not be the final block, add an
-  // empty one after this.
-  if (final_block) {
-    brotli::WriteBits(1, 1, storage_ix, storage);  // islast
-    brotli::WriteBits(1, 1, storage_ix, storage);  // isempty
-    JumpToByteBoundary(storage_ix, storage);
-  }
-}
-
-void StoreSyncMetaBlock(size_t * __restrict storage_ix,
-                        uint8_t * __restrict storage) {
-  // Empty metadata meta-block bit pattern:
-  //   1 bit:  is_last (0)
-  //   2 bits: num nibbles (3)
-  //   1 bit:  reserved (0)
-  //   2 bits: metadata length bytes (0)
-  WriteBits(6, 6, storage_ix, storage);
-  JumpToByteBoundary(storage_ix, storage);
-}
-
-}  // namespace brotli