--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/brotli/c/enc/metablock.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,675 @@
+/* Copyright 2015 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Algorithms for distributing the literals and commands of a metablock between
+   block types and contexts. */
+
+#include "metablock.h"
+
+#include <brotli/types.h>
+
+#include "../common/constants.h"
+#include "../common/context.h"
+#include "../common/platform.h"
+#include "bit_cost.h"
+#include "block_splitter.h"
+#include "cluster.h"
+#include "entropy_encode.h"
+#include "histogram.h"
+#include "memory.h"
+#include "quality.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+void BrotliInitDistanceParams(BrotliDistanceParams* dist_params,
+    uint32_t npostfix, uint32_t ndirect, BROTLI_BOOL large_window) {
+  uint32_t alphabet_size_max;
+  uint32_t alphabet_size_limit;
+  uint32_t max_distance;
+
+  dist_params->distance_postfix_bits = npostfix;
+  dist_params->num_direct_distance_codes = ndirect;
+
+  alphabet_size_max = BROTLI_DISTANCE_ALPHABET_SIZE(
+      npostfix, ndirect, BROTLI_MAX_DISTANCE_BITS);
+  alphabet_size_limit = alphabet_size_max;
+  max_distance = ndirect + (1U << (BROTLI_MAX_DISTANCE_BITS + npostfix + 2)) -
+      (1U << (npostfix + 2));
+
+  if (large_window) {
+    BrotliDistanceCodeLimit limit = BrotliCalculateDistanceCodeLimit(
+        BROTLI_MAX_ALLOWED_DISTANCE, npostfix, ndirect);
+    alphabet_size_max = BROTLI_DISTANCE_ALPHABET_SIZE(
+        npostfix, ndirect, BROTLI_LARGE_MAX_DISTANCE_BITS);
+    alphabet_size_limit = limit.max_alphabet_size;
+    max_distance = limit.max_distance;
+  }
+
+  dist_params->alphabet_size_max = alphabet_size_max;
+  dist_params->alphabet_size_limit = alphabet_size_limit;
+  dist_params->max_distance = max_distance;
+}
+
+static void RecomputeDistancePrefixes(Command* cmds,
+                                      size_t num_commands,
+                                      const BrotliDistanceParams* orig_params,
+                                      const BrotliDistanceParams* new_params) {
+  size_t i;
+
+  if (orig_params->distance_postfix_bits == new_params->distance_postfix_bits &&
+      orig_params->num_direct_distance_codes ==
+      new_params->num_direct_distance_codes) {
+    return;
+  }
+
+  for (i = 0; i < num_commands; ++i) {
+    Command* cmd = &cmds[i];
+    if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) {
+      PrefixEncodeCopyDistance(CommandRestoreDistanceCode(cmd, orig_params),
+                               new_params->num_direct_distance_codes,
+                               new_params->distance_postfix_bits,
+                               &cmd->dist_prefix_,
+                               &cmd->dist_extra_);
+    }
+  }
+}
+
+static BROTLI_BOOL ComputeDistanceCost(const Command* cmds,
+                                       size_t num_commands,
+                                       const BrotliDistanceParams* orig_params,
+                                       const BrotliDistanceParams* new_params,
+                                       double* cost,
+                                       HistogramDistance* tmp) {
+  size_t i;
+  BROTLI_BOOL equal_params = BROTLI_FALSE;
+  uint16_t dist_prefix;
+  uint32_t dist_extra;
+  double extra_bits = 0.0;
+  HistogramClearDistance(tmp);
+
+  if (orig_params->distance_postfix_bits == new_params->distance_postfix_bits &&
+      orig_params->num_direct_distance_codes ==
+      new_params->num_direct_distance_codes) {
+    equal_params = BROTLI_TRUE;
+  }
+
+  for (i = 0; i < num_commands; i++) {
+    const Command* cmd = &cmds[i];
+    if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) {
+      if (equal_params) {
+        dist_prefix = cmd->dist_prefix_;
+      } else {
+        uint32_t distance = CommandRestoreDistanceCode(cmd, orig_params);
+        if (distance > new_params->max_distance) {
+          return BROTLI_FALSE;
+        }
+        PrefixEncodeCopyDistance(distance,
+                                 new_params->num_direct_distance_codes,
+                                 new_params->distance_postfix_bits,
+                                 &dist_prefix,
+                                 &dist_extra);
+      }
+      HistogramAddDistance(tmp, dist_prefix & 0x3FF);
+      extra_bits += dist_prefix >> 10;
+    }
+  }
+
+  *cost = BrotliPopulationCostDistance(tmp) + extra_bits;
+  return BROTLI_TRUE;
+}
+
+void BrotliBuildMetaBlock(MemoryManager* m,
+                          const uint8_t* ringbuffer,
+                          const size_t pos,
+                          const size_t mask,
+                          BrotliEncoderParams* params,
+                          uint8_t prev_byte,
+                          uint8_t prev_byte2,
+                          Command* cmds,
+                          size_t num_commands,
+                          ContextType literal_context_mode,
+                          MetaBlockSplit* mb) {
+  /* Histogram ids need to fit in one byte. */
+  static const size_t kMaxNumberOfHistograms = 256;
+  HistogramDistance* distance_histograms;
+  HistogramLiteral* literal_histograms;
+  ContextType* literal_context_modes = NULL;
+  size_t literal_histograms_size;
+  size_t distance_histograms_size;
+  size_t i;
+  size_t literal_context_multiplier = 1;
+  uint32_t npostfix;
+  uint32_t ndirect_msb = 0;
+  BROTLI_BOOL check_orig = BROTLI_TRUE;
+  double best_dist_cost = 1e99;
+  BrotliDistanceParams orig_params = params->dist;
+  BrotliDistanceParams new_params = params->dist;
+  HistogramDistance* tmp = BROTLI_ALLOC(m, HistogramDistance, 1);
+
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(tmp)) return;
+
+  for (npostfix = 0; npostfix <= BROTLI_MAX_NPOSTFIX; npostfix++) {
+    for (; ndirect_msb < 16; ndirect_msb++) {
+      uint32_t ndirect = ndirect_msb << npostfix;
+      BROTLI_BOOL skip;
+      double dist_cost;
+      BrotliInitDistanceParams(&new_params, npostfix, ndirect,
+                               params->large_window);
+      if (npostfix == orig_params.distance_postfix_bits &&
+          ndirect == orig_params.num_direct_distance_codes) {
+        check_orig = BROTLI_FALSE;
+      }
+      skip = !ComputeDistanceCost(
+          cmds, num_commands, &orig_params, &new_params, &dist_cost, tmp);
+      if (skip || (dist_cost > best_dist_cost)) {
+        break;
+      }
+      best_dist_cost = dist_cost;
+      params->dist = new_params;
+    }
+    if (ndirect_msb > 0) ndirect_msb--;
+    ndirect_msb /= 2;
+  }
+  if (check_orig) {
+    double dist_cost;
+    ComputeDistanceCost(cmds, num_commands, &orig_params, &orig_params,
+                        &dist_cost, tmp);
+    if (dist_cost < best_dist_cost) {
+      /* NB: currently unused; uncomment when more param tuning is added. */
+      /* best_dist_cost = dist_cost; */
+      params->dist = orig_params;
+    }
+  }
+  BROTLI_FREE(m, tmp);
+  RecomputeDistancePrefixes(cmds, num_commands, &orig_params, &params->dist);
+
+  BrotliSplitBlock(m, cmds, num_commands,
+                   ringbuffer, pos, mask, params,
+                   &mb->literal_split,
+                   &mb->command_split,
+                   &mb->distance_split);
+  if (BROTLI_IS_OOM(m)) return;
+
+  if (!params->disable_literal_context_modeling) {
+    literal_context_multiplier = 1 << BROTLI_LITERAL_CONTEXT_BITS;
+    literal_context_modes =
+        BROTLI_ALLOC(m, ContextType, mb->literal_split.num_types);
+    if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(literal_context_modes)) return;
+    for (i = 0; i < mb->literal_split.num_types; ++i) {
+      literal_context_modes[i] = literal_context_mode;
+    }
+  }
+
+  literal_histograms_size =
+      mb->literal_split.num_types * literal_context_multiplier;
+  literal_histograms =
+      BROTLI_ALLOC(m, HistogramLiteral, literal_histograms_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(literal_histograms)) return;
+  ClearHistogramsLiteral(literal_histograms, literal_histograms_size);
+
+  distance_histograms_size =
+      mb->distance_split.num_types << BROTLI_DISTANCE_CONTEXT_BITS;
+  distance_histograms =
+      BROTLI_ALLOC(m, HistogramDistance, distance_histograms_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(distance_histograms)) return;
+  ClearHistogramsDistance(distance_histograms, distance_histograms_size);
+
+  BROTLI_DCHECK(mb->command_histograms == 0);
+  mb->command_histograms_size = mb->command_split.num_types;
+  mb->command_histograms =
+      BROTLI_ALLOC(m, HistogramCommand, mb->command_histograms_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->command_histograms)) return;
+  ClearHistogramsCommand(mb->command_histograms, mb->command_histograms_size);
+
+  BrotliBuildHistogramsWithContext(cmds, num_commands,
+      &mb->literal_split, &mb->command_split, &mb->distance_split,
+      ringbuffer, pos, mask, prev_byte, prev_byte2, literal_context_modes,
+      literal_histograms, mb->command_histograms, distance_histograms);
+  BROTLI_FREE(m, literal_context_modes);
+
+  BROTLI_DCHECK(mb->literal_context_map == 0);
+  mb->literal_context_map_size =
+      mb->literal_split.num_types << BROTLI_LITERAL_CONTEXT_BITS;
+  mb->literal_context_map =
+      BROTLI_ALLOC(m, uint32_t, mb->literal_context_map_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->literal_context_map)) return;
+
+  BROTLI_DCHECK(mb->literal_histograms == 0);
+  mb->literal_histograms_size = mb->literal_context_map_size;
+  mb->literal_histograms =
+      BROTLI_ALLOC(m, HistogramLiteral, mb->literal_histograms_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->literal_histograms)) return;
+
+  BrotliClusterHistogramsLiteral(m, literal_histograms, literal_histograms_size,
+      kMaxNumberOfHistograms, mb->literal_histograms,
+      &mb->literal_histograms_size, mb->literal_context_map);
+  if (BROTLI_IS_OOM(m)) return;
+  BROTLI_FREE(m, literal_histograms);
+
+  if (params->disable_literal_context_modeling) {
+    /* Distribute assignment to all contexts. */
+    for (i = mb->literal_split.num_types; i != 0;) {
+      size_t j = 0;
+      i--;
+      for (; j < (1 << BROTLI_LITERAL_CONTEXT_BITS); j++) {
+        mb->literal_context_map[(i << BROTLI_LITERAL_CONTEXT_BITS) + j] =
+            mb->literal_context_map[i];
+      }
+    }
+  }
+
+  BROTLI_DCHECK(mb->distance_context_map == 0);
+  mb->distance_context_map_size =
+      mb->distance_split.num_types << BROTLI_DISTANCE_CONTEXT_BITS;
+  mb->distance_context_map =
+      BROTLI_ALLOC(m, uint32_t, mb->distance_context_map_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->distance_context_map)) return;
+
+  BROTLI_DCHECK(mb->distance_histograms == 0);
+  mb->distance_histograms_size = mb->distance_context_map_size;
+  mb->distance_histograms =
+      BROTLI_ALLOC(m, HistogramDistance, mb->distance_histograms_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->distance_histograms)) return;
+
+  BrotliClusterHistogramsDistance(m, distance_histograms,
+                                  mb->distance_context_map_size,
+                                  kMaxNumberOfHistograms,
+                                  mb->distance_histograms,
+                                  &mb->distance_histograms_size,
+                                  mb->distance_context_map);
+  if (BROTLI_IS_OOM(m)) return;
+  BROTLI_FREE(m, distance_histograms);
+}
+
+#define FN(X) X ## Literal
+#include "metablock_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+#define FN(X) X ## Command
+#include "metablock_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+#define FN(X) X ## Distance
+#include "metablock_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+/* Greedy block splitter for one block category (literal, command or distance).
+   Gathers histograms for all context buckets. */
+typedef struct ContextBlockSplitter {
+  /* Alphabet size of particular block category. */
+  size_t alphabet_size_;
+  size_t num_contexts_;
+  size_t max_block_types_;
+  /* We collect at least this many symbols for each block. */
+  size_t min_block_size_;
+  /* We merge histograms A and B if
+       entropy(A+B) < entropy(A) + entropy(B) + split_threshold_,
+     where A is the current histogram and B is the histogram of the last or the
+     second last block type. */
+  double split_threshold_;
+
+  size_t num_blocks_;
+  BlockSplit* split_;  /* not owned */
+  HistogramLiteral* histograms_;  /* not owned */
+  size_t* histograms_size_;  /* not owned */
+
+  /* The number of symbols that we want to collect before deciding on whether
+     or not to merge the block with a previous one or emit a new block. */
+  size_t target_block_size_;
+  /* The number of symbols in the current histogram. */
+  size_t block_size_;
+  /* Offset of the current histogram. */
+  size_t curr_histogram_ix_;
+  /* Offset of the histograms of the previous two block types. */
+  size_t last_histogram_ix_[2];
+  /* Entropy of the previous two block types. */
+  double last_entropy_[2 * BROTLI_MAX_STATIC_CONTEXTS];
+  /* The number of times we merged the current block with the last one. */
+  size_t merge_last_count_;
+} ContextBlockSplitter;
+
+static void InitContextBlockSplitter(
+    MemoryManager* m, ContextBlockSplitter* self, size_t alphabet_size,
+    size_t num_contexts, size_t min_block_size, double split_threshold,
+    size_t num_symbols, BlockSplit* split, HistogramLiteral** histograms,
+    size_t* histograms_size) {
+  size_t max_num_blocks = num_symbols / min_block_size + 1;
+  size_t max_num_types;
+  BROTLI_DCHECK(num_contexts <= BROTLI_MAX_STATIC_CONTEXTS);
+
+  self->alphabet_size_ = alphabet_size;
+  self->num_contexts_ = num_contexts;
+  self->max_block_types_ = BROTLI_MAX_NUMBER_OF_BLOCK_TYPES / num_contexts;
+  self->min_block_size_ = min_block_size;
+  self->split_threshold_ = split_threshold;
+  self->num_blocks_ = 0;
+  self->split_ = split;
+  self->histograms_size_ = histograms_size;
+  self->target_block_size_ = min_block_size;
+  self->block_size_ = 0;
+  self->curr_histogram_ix_ = 0;
+  self->merge_last_count_ = 0;
+
+  /* We have to allocate one more histogram than the maximum number of block
+     types for the current histogram when the meta-block is too big. */
+  max_num_types =
+      BROTLI_MIN(size_t, max_num_blocks, self->max_block_types_ + 1);
+  BROTLI_ENSURE_CAPACITY(m, uint8_t,
+      split->types, split->types_alloc_size, max_num_blocks);
+  BROTLI_ENSURE_CAPACITY(m, uint32_t,
+      split->lengths, split->lengths_alloc_size, max_num_blocks);
+  if (BROTLI_IS_OOM(m)) return;
+  split->num_blocks = max_num_blocks;
+  if (BROTLI_IS_OOM(m)) return;
+  BROTLI_DCHECK(*histograms == 0);
+  *histograms_size = max_num_types * num_contexts;
+  *histograms = BROTLI_ALLOC(m, HistogramLiteral, *histograms_size);
+  self->histograms_ = *histograms;
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(*histograms)) return;
+  /* Clear only current histogram. */
+  ClearHistogramsLiteral(&self->histograms_[0], num_contexts);
+  self->last_histogram_ix_[0] = self->last_histogram_ix_[1] = 0;
+}
+
+/* Does either of three things:
+     (1) emits the current block with a new block type;
+     (2) emits the current block with the type of the second last block;
+     (3) merges the current block with the last block. */
+static void ContextBlockSplitterFinishBlock(
+    ContextBlockSplitter* self, MemoryManager* m, BROTLI_BOOL is_final) {
+  BlockSplit* split = self->split_;
+  const size_t num_contexts = self->num_contexts_;
+  double* last_entropy = self->last_entropy_;
+  HistogramLiteral* histograms = self->histograms_;
+
+  if (self->block_size_ < self->min_block_size_) {
+    self->block_size_ = self->min_block_size_;
+  }
+  if (self->num_blocks_ == 0) {
+    size_t i;
+    /* Create first block. */
+    split->lengths[0] = (uint32_t)self->block_size_;
+    split->types[0] = 0;
+
+    for (i = 0; i < num_contexts; ++i) {
+      last_entropy[i] =
+          BitsEntropy(histograms[i].data_, self->alphabet_size_);
+      last_entropy[num_contexts + i] = last_entropy[i];
+    }
+    ++self->num_blocks_;
+    ++split->num_types;
+    self->curr_histogram_ix_ += num_contexts;
+    if (self->curr_histogram_ix_ < *self->histograms_size_) {
+      ClearHistogramsLiteral(
+          &self->histograms_[self->curr_histogram_ix_], self->num_contexts_);
+    }
+    self->block_size_ = 0;
+  } else if (self->block_size_ > 0) {
+    /* Try merging the set of histograms for the current block type with the
+       respective set of histograms for the last and second last block types.
+       Decide over the split based on the total reduction of entropy across
+       all contexts. */
+    double entropy[BROTLI_MAX_STATIC_CONTEXTS];
+    HistogramLiteral* combined_histo =
+        BROTLI_ALLOC(m, HistogramLiteral, 2 * num_contexts);
+    double combined_entropy[2 * BROTLI_MAX_STATIC_CONTEXTS];
+    double diff[2] = { 0.0 };
+    size_t i;
+    if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(combined_histo)) return;
+    for (i = 0; i < num_contexts; ++i) {
+      size_t curr_histo_ix = self->curr_histogram_ix_ + i;
+      size_t j;
+      entropy[i] = BitsEntropy(histograms[curr_histo_ix].data_,
+                               self->alphabet_size_);
+      for (j = 0; j < 2; ++j) {
+        size_t jx = j * num_contexts + i;
+        size_t last_histogram_ix = self->last_histogram_ix_[j] + i;
+        combined_histo[jx] = histograms[curr_histo_ix];
+        HistogramAddHistogramLiteral(&combined_histo[jx],
+            &histograms[last_histogram_ix]);
+        combined_entropy[jx] = BitsEntropy(
+            &combined_histo[jx].data_[0], self->alphabet_size_);
+        diff[j] += combined_entropy[jx] - entropy[i] - last_entropy[jx];
+      }
+    }
+
+    if (split->num_types < self->max_block_types_ &&
+        diff[0] > self->split_threshold_ &&
+        diff[1] > self->split_threshold_) {
+      /* Create new block. */
+      split->lengths[self->num_blocks_] = (uint32_t)self->block_size_;
+      split->types[self->num_blocks_] = (uint8_t)split->num_types;
+      self->last_histogram_ix_[1] = self->last_histogram_ix_[0];
+      self->last_histogram_ix_[0] = split->num_types * num_contexts;
+      for (i = 0; i < num_contexts; ++i) {
+        last_entropy[num_contexts + i] = last_entropy[i];
+        last_entropy[i] = entropy[i];
+      }
+      ++self->num_blocks_;
+      ++split->num_types;
+      self->curr_histogram_ix_ += num_contexts;
+      if (self->curr_histogram_ix_ < *self->histograms_size_) {
+        ClearHistogramsLiteral(
+            &self->histograms_[self->curr_histogram_ix_], self->num_contexts_);
+      }
+      self->block_size_ = 0;
+      self->merge_last_count_ = 0;
+      self->target_block_size_ = self->min_block_size_;
+    } else if (diff[1] < diff[0] - 20.0) {
+      /* Combine this block with second last block. */
+      split->lengths[self->num_blocks_] = (uint32_t)self->block_size_;
+      split->types[self->num_blocks_] = split->types[self->num_blocks_ - 2];
+      BROTLI_SWAP(size_t, self->last_histogram_ix_, 0, 1);
+      for (i = 0; i < num_contexts; ++i) {
+        histograms[self->last_histogram_ix_[0] + i] =
+            combined_histo[num_contexts + i];
+        last_entropy[num_contexts + i] = last_entropy[i];
+        last_entropy[i] = combined_entropy[num_contexts + i];
+        HistogramClearLiteral(&histograms[self->curr_histogram_ix_ + i]);
+      }
+      ++self->num_blocks_;
+      self->block_size_ = 0;
+      self->merge_last_count_ = 0;
+      self->target_block_size_ = self->min_block_size_;
+    } else {
+      /* Combine this block with last block. */
+      split->lengths[self->num_blocks_ - 1] += (uint32_t)self->block_size_;
+      for (i = 0; i < num_contexts; ++i) {
+        histograms[self->last_histogram_ix_[0] + i] = combined_histo[i];
+        last_entropy[i] = combined_entropy[i];
+        if (split->num_types == 1) {
+          last_entropy[num_contexts + i] = last_entropy[i];
+        }
+        HistogramClearLiteral(&histograms[self->curr_histogram_ix_ + i]);
+      }
+      self->block_size_ = 0;
+      if (++self->merge_last_count_ > 1) {
+        self->target_block_size_ += self->min_block_size_;
+      }
+    }
+    BROTLI_FREE(m, combined_histo);
+  }
+  if (is_final) {
+    *self->histograms_size_ = split->num_types * num_contexts;
+    split->num_blocks = self->num_blocks_;
+  }
+}
+
+/* Adds the next symbol to the current block type and context. When the
+   current block reaches the target size, decides on merging the block. */
+static void ContextBlockSplitterAddSymbol(
+    ContextBlockSplitter* self, MemoryManager* m,
+    size_t symbol, size_t context) {
+  HistogramAddLiteral(&self->histograms_[self->curr_histogram_ix_ + context],
+      symbol);
+  ++self->block_size_;
+  if (self->block_size_ == self->target_block_size_) {
+    ContextBlockSplitterFinishBlock(self, m, /* is_final = */ BROTLI_FALSE);
+    if (BROTLI_IS_OOM(m)) return;
+  }
+}
+
+static void MapStaticContexts(MemoryManager* m,
+                              size_t num_contexts,
+                              const uint32_t* static_context_map,
+                              MetaBlockSplit* mb) {
+  size_t i;
+  BROTLI_DCHECK(mb->literal_context_map == 0);
+  mb->literal_context_map_size =
+      mb->literal_split.num_types << BROTLI_LITERAL_CONTEXT_BITS;
+  mb->literal_context_map =
+      BROTLI_ALLOC(m, uint32_t, mb->literal_context_map_size);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(mb->literal_context_map)) return;
+
+  for (i = 0; i < mb->literal_split.num_types; ++i) {
+    uint32_t offset = (uint32_t)(i * num_contexts);
+    size_t j;
+    for (j = 0; j < (1u << BROTLI_LITERAL_CONTEXT_BITS); ++j) {
+      mb->literal_context_map[(i << BROTLI_LITERAL_CONTEXT_BITS) + j] =
+          offset + static_context_map[j];
+    }
+  }
+}
+
+typedef struct GreedyMetablockArena {
+  union {
+    BlockSplitterLiteral plain;
+    ContextBlockSplitter ctx;
+  } lit_blocks;
+  BlockSplitterCommand cmd_blocks;
+  BlockSplitterDistance dist_blocks;
+} GreedyMetablockArena;
+
+static BROTLI_INLINE void BrotliBuildMetaBlockGreedyInternal(
+    MemoryManager* m, GreedyMetablockArena* arena, const uint8_t* ringbuffer,
+    size_t pos, size_t mask, uint8_t prev_byte, uint8_t prev_byte2,
+    ContextLut literal_context_lut, const size_t num_contexts,
+    const uint32_t* static_context_map, const Command* commands,
+    size_t n_commands, MetaBlockSplit* mb) {
+  size_t num_literals = 0;
+  size_t i;
+  for (i = 0; i < n_commands; ++i) {
+    num_literals += commands[i].insert_len_;
+  }
+
+  if (num_contexts == 1) {
+    InitBlockSplitterLiteral(m, &arena->lit_blocks.plain, 256, 512, 400.0,
+        num_literals, &mb->literal_split, &mb->literal_histograms,
+        &mb->literal_histograms_size);
+  } else {
+    InitContextBlockSplitter(m, &arena->lit_blocks.ctx, 256, num_contexts, 512,
+        400.0, num_literals, &mb->literal_split, &mb->literal_histograms,
+        &mb->literal_histograms_size);
+  }
+  if (BROTLI_IS_OOM(m)) return;
+  InitBlockSplitterCommand(m, &arena->cmd_blocks, BROTLI_NUM_COMMAND_SYMBOLS,
+      1024, 500.0, n_commands, &mb->command_split, &mb->command_histograms,
+      &mb->command_histograms_size);
+  if (BROTLI_IS_OOM(m)) return;
+  InitBlockSplitterDistance(m, &arena->dist_blocks, 64, 512, 100.0, n_commands,
+      &mb->distance_split, &mb->distance_histograms,
+      &mb->distance_histograms_size);
+  if (BROTLI_IS_OOM(m)) return;
+
+  for (i = 0; i < n_commands; ++i) {
+    const Command cmd = commands[i];
+    size_t j;
+    BlockSplitterAddSymbolCommand(&arena->cmd_blocks, cmd.cmd_prefix_);
+    for (j = cmd.insert_len_; j != 0; --j) {
+      uint8_t literal = ringbuffer[pos & mask];
+      if (num_contexts == 1) {
+        BlockSplitterAddSymbolLiteral(&arena->lit_blocks.plain, literal);
+      } else {
+        size_t context =
+            BROTLI_CONTEXT(prev_byte, prev_byte2, literal_context_lut);
+        ContextBlockSplitterAddSymbol(&arena->lit_blocks.ctx, m, literal,
+                                      static_context_map[context]);
+        if (BROTLI_IS_OOM(m)) return;
+      }
+      prev_byte2 = prev_byte;
+      prev_byte = literal;
+      ++pos;
+    }
+    pos += CommandCopyLen(&cmd);
+    if (CommandCopyLen(&cmd)) {
+      prev_byte2 = ringbuffer[(pos - 2) & mask];
+      prev_byte = ringbuffer[(pos - 1) & mask];
+      if (cmd.cmd_prefix_ >= 128) {
+        BlockSplitterAddSymbolDistance(
+            &arena->dist_blocks, cmd.dist_prefix_ & 0x3FF);
+      }
+    }
+  }
+
+  if (num_contexts == 1) {
+    BlockSplitterFinishBlockLiteral(
+        &arena->lit_blocks.plain, /* is_final = */ BROTLI_TRUE);
+  } else {
+    ContextBlockSplitterFinishBlock(
+        &arena->lit_blocks.ctx, m, /* is_final = */ BROTLI_TRUE);
+    if (BROTLI_IS_OOM(m)) return;
+  }
+  BlockSplitterFinishBlockCommand(
+      &arena->cmd_blocks, /* is_final = */ BROTLI_TRUE);
+  BlockSplitterFinishBlockDistance(
+      &arena->dist_blocks, /* is_final = */ BROTLI_TRUE);
+
+  if (num_contexts > 1) {
+    MapStaticContexts(m, num_contexts, static_context_map, mb);
+  }
+}
+
+void BrotliBuildMetaBlockGreedy(MemoryManager* m,
+                                const uint8_t* ringbuffer,
+                                size_t pos,
+                                size_t mask,
+                                uint8_t prev_byte,
+                                uint8_t prev_byte2,
+                                ContextLut literal_context_lut,
+                                size_t num_contexts,
+                                const uint32_t* static_context_map,
+                                const Command* commands,
+                                size_t n_commands,
+                                MetaBlockSplit* mb) {
+  GreedyMetablockArena* arena = BROTLI_ALLOC(m, GreedyMetablockArena, 1);
+  if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(arena)) return;
+  if (num_contexts == 1) {
+    BrotliBuildMetaBlockGreedyInternal(m, arena, ringbuffer, pos, mask,
+        prev_byte, prev_byte2, literal_context_lut, 1, NULL, commands,
+        n_commands, mb);
+  } else {
+    BrotliBuildMetaBlockGreedyInternal(m, arena, ringbuffer, pos, mask,
+        prev_byte, prev_byte2, literal_context_lut, num_contexts,
+        static_context_map, commands, n_commands, mb);
+  }
+  BROTLI_FREE(m, arena);
+}
+
+void BrotliOptimizeHistograms(uint32_t num_distance_codes,
+                              MetaBlockSplit* mb) {
+  uint8_t good_for_rle[BROTLI_NUM_COMMAND_SYMBOLS];
+  size_t i;
+  for (i = 0; i < mb->literal_histograms_size; ++i) {
+    BrotliOptimizeHuffmanCountsForRle(256, mb->literal_histograms[i].data_,
+                                      good_for_rle);
+  }
+  for (i = 0; i < mb->command_histograms_size; ++i) {
+    BrotliOptimizeHuffmanCountsForRle(BROTLI_NUM_COMMAND_SYMBOLS,
+                                      mb->command_histograms[i].data_,
+                                      good_for_rle);
+  }
+  for (i = 0; i < mb->distance_histograms_size; ++i) {
+    BrotliOptimizeHuffmanCountsForRle(num_distance_codes,
+                                      mb->distance_histograms[i].data_,
+                                      good_for_rle);
+  }
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif