--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/brotli/c/enc/encode.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,2004 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Implementation of Brotli compressor. */
+
+#include <brotli/encode.h>
+#include <brotli/shared_dictionary.h>
+#include <brotli/types.h>
+
+#include <stdlib.h>  /* free, malloc */
+#include <string.h>  /* memcpy, memset */
+
+#include "../common/constants.h"
+#include "../common/context.h"
+#include "../common/platform.h"
+#include "../common/version.h"
+#include "backward_references.h"
+#include "backward_references_hq.h"
+#include "bit_cost.h"
+#include "brotli_bit_stream.h"
+#include "compress_fragment.h"
+#include "compress_fragment_two_pass.h"
+#include "dictionary_hash.h"
+#include "encoder_dict.h"
+#include "entropy_encode.h"
+#include "fast_log.h"
+#include "hash.h"
+#include "histogram.h"
+#include "memory.h"
+#include "metablock.h"
+#include "prefix.h"
+#include "state.h"
+#include "quality.h"
+#include "ringbuffer.h"
+#include "utf8_util.h"
+#include "write_bits.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#define COPY_ARRAY(dst, src) memcpy(dst, src, sizeof(src));
+
+static size_t InputBlockSize(BrotliEncoderState* s) {
+  return (size_t)1 << s->params.lgblock;
+}
+
+static uint64_t UnprocessedInputSize(BrotliEncoderState* s) {
+  return s->input_pos_ - s->last_processed_pos_;
+}
+
+static size_t RemainingInputBlockSize(BrotliEncoderState* s) {
+  const uint64_t delta = UnprocessedInputSize(s);
+  size_t block_size = InputBlockSize(s);
+  if (delta >= block_size) return 0;
+  return block_size - (size_t)delta;
+}
+
+BROTLI_BOOL BrotliEncoderSetParameter(
+    BrotliEncoderState* state, BrotliEncoderParameter p, uint32_t value) {
+  /* Changing parameters on the fly is not implemented yet. */
+  if (state->is_initialized_) return BROTLI_FALSE;
+  /* TODO(eustas): Validate/clamp parameters here. */
+  switch (p) {
+    case BROTLI_PARAM_MODE:
+      state->params.mode = (BrotliEncoderMode)value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_QUALITY:
+      state->params.quality = (int)value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_LGWIN:
+      state->params.lgwin = (int)value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_LGBLOCK:
+      state->params.lgblock = (int)value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING:
+      if ((value != 0) && (value != 1)) return BROTLI_FALSE;
+      state->params.disable_literal_context_modeling = TO_BROTLI_BOOL(!!value);
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_SIZE_HINT:
+      state->params.size_hint = value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_LARGE_WINDOW:
+      state->params.large_window = TO_BROTLI_BOOL(!!value);
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_NPOSTFIX:
+      state->params.dist.distance_postfix_bits = value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_NDIRECT:
+      state->params.dist.num_direct_distance_codes = value;
+      return BROTLI_TRUE;
+
+    case BROTLI_PARAM_STREAM_OFFSET:
+      if (value > (1u << 30)) return BROTLI_FALSE;
+      state->params.stream_offset = value;
+      return BROTLI_TRUE;
+
+    default: return BROTLI_FALSE;
+  }
+}
+
+/* Wraps 64-bit input position to 32-bit ring-buffer position preserving
+   "not-a-first-lap" feature. */
+static uint32_t WrapPosition(uint64_t position) {
+  uint32_t result = (uint32_t)position;
+  uint64_t gb = position >> 30;
+  if (gb > 2) {
+    /* Wrap every 2GiB; The first 3GB are continuous. */
+    result = (result & ((1u << 30) - 1)) | ((uint32_t)((gb - 1) & 1) + 1) << 30;
+  }
+  return result;
+}
+
+static uint8_t* GetBrotliStorage(BrotliEncoderState* s, size_t size) {
+  MemoryManager* m = &s->memory_manager_;
+  if (s->storage_size_ < size) {
+    BROTLI_FREE(m, s->storage_);
+    s->storage_ = BROTLI_ALLOC(m, uint8_t, size);
+    if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(s->storage_)) return NULL;
+    s->storage_size_ = size;
+  }
+  return s->storage_;
+}
+
+static size_t HashTableSize(size_t max_table_size, size_t input_size) {
+  size_t htsize = 256;
+  while (htsize < max_table_size && htsize < input_size) {
+    htsize <<= 1;
+  }
+  return htsize;
+}
+
+static int* GetHashTable(BrotliEncoderState* s, int quality,
+                         size_t input_size, size_t* table_size) {
+  /* Use smaller hash table when input.size() is smaller, since we
+     fill the table, incurring O(hash table size) overhead for
+     compression, and if the input is short, we won't need that
+     many hash table entries anyway. */
+  MemoryManager* m = &s->memory_manager_;
+  const size_t max_table_size = MaxHashTableSize(quality);
+  size_t htsize = HashTableSize(max_table_size, input_size);
+  int* table;
+  BROTLI_DCHECK(max_table_size >= 256);
+  if (quality == FAST_ONE_PASS_COMPRESSION_QUALITY) {
+    /* Only odd shifts are supported by fast-one-pass. */
+    if ((htsize & 0xAAAAA) == 0) {
+      htsize <<= 1;
+    }
+  }
+
+  if (htsize <= sizeof(s->small_table_) / sizeof(s->small_table_[0])) {
+    table = s->small_table_;
+  } else {
+    if (htsize > s->large_table_size_) {
+      s->large_table_size_ = htsize;
+      BROTLI_FREE(m, s->large_table_);
+      s->large_table_ = BROTLI_ALLOC(m, int, htsize);
+      if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(s->large_table_)) return 0;
+    }
+    table = s->large_table_;
+  }
+
+  *table_size = htsize;
+  memset(table, 0, htsize * sizeof(*table));
+  return table;
+}
+
+static void EncodeWindowBits(int lgwin, BROTLI_BOOL large_window,
+    uint16_t* last_bytes, uint8_t* last_bytes_bits) {
+  if (large_window) {
+    *last_bytes = (uint16_t)(((lgwin & 0x3F) << 8) | 0x11);
+    *last_bytes_bits = 14;
+  } else {
+    if (lgwin == 16) {
+      *last_bytes = 0;
+      *last_bytes_bits = 1;
+    } else if (lgwin == 17) {
+      *last_bytes = 1;
+      *last_bytes_bits = 7;
+    } else if (lgwin > 17) {
+      *last_bytes = (uint16_t)(((lgwin - 17) << 1) | 0x01);
+      *last_bytes_bits = 4;
+    } else {
+      *last_bytes = (uint16_t)(((lgwin - 8) << 4) | 0x01);
+      *last_bytes_bits = 7;
+    }
+  }
+}
+
+/* TODO(eustas): move to compress_fragment.c? */
+/* Initializes the command and distance prefix codes for the first block. */
+static void InitCommandPrefixCodes(BrotliOnePassArena* s) {
+  static const uint8_t kDefaultCommandDepths[128] = {
+    0, 4, 4, 5, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8,
+    0, 0, 0, 4, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7,
+    7, 7, 10, 10, 10, 10, 10, 10, 0, 4, 4, 5, 5, 5, 6, 6,
+    7, 8, 8, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+    5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4,
+    4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 8, 10,
+    12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+  };
+  static const uint16_t kDefaultCommandBits[128] = {
+    0,   0,   8,   9,   3,  35,   7,   71,
+    39, 103,  23,  47, 175, 111, 239,   31,
+    0,   0,   0,   4,  12,   2,  10,    6,
+    13,  29,  11,  43,  27,  59,  87,   55,
+    15,  79, 319, 831, 191, 703, 447,  959,
+    0,  14,   1,  25,   5,  21,  19,   51,
+    119, 159,  95, 223, 479, 991,  63,  575,
+    127, 639, 383, 895, 255, 767, 511, 1023,
+    14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    27, 59, 7, 39, 23, 55, 30, 1, 17, 9, 25, 5, 0, 8, 4, 12,
+    2, 10, 6, 21, 13, 29, 3, 19, 11, 15, 47, 31, 95, 63, 127, 255,
+    767, 2815, 1791, 3839, 511, 2559, 1535, 3583, 1023, 3071, 2047, 4095,
+  };
+  static const uint8_t kDefaultCommandCode[] = {
+    0xff, 0x77, 0xd5, 0xbf, 0xe7, 0xde, 0xea, 0x9e, 0x51, 0x5d, 0xde, 0xc6,
+    0x70, 0x57, 0xbc, 0x58, 0x58, 0x58, 0xd8, 0xd8, 0x58, 0xd5, 0xcb, 0x8c,
+    0xea, 0xe0, 0xc3, 0x87, 0x1f, 0x83, 0xc1, 0x60, 0x1c, 0x67, 0xb2, 0xaa,
+    0x06, 0x83, 0xc1, 0x60, 0x30, 0x18, 0xcc, 0xa1, 0xce, 0x88, 0x54, 0x94,
+    0x46, 0xe1, 0xb0, 0xd0, 0x4e, 0xb2, 0xf7, 0x04, 0x00,
+  };
+  static const size_t kDefaultCommandCodeNumBits = 448;
+  COPY_ARRAY(s->cmd_depth, kDefaultCommandDepths);
+  COPY_ARRAY(s->cmd_bits, kDefaultCommandBits);
+
+  /* Initialize the pre-compressed form of the command and distance prefix
+     codes. */
+  COPY_ARRAY(s->cmd_code, kDefaultCommandCode);
+  s->cmd_code_numbits = kDefaultCommandCodeNumBits;
+}
+
+/* Decide about the context map based on the ability of the prediction
+   ability of the previous byte UTF8-prefix on the next byte. The
+   prediction ability is calculated as Shannon entropy. Here we need
+   Shannon entropy instead of 'BitsEntropy' since the prefix will be
+   encoded with the remaining 6 bits of the following byte, and
+   BitsEntropy will assume that symbol to be stored alone using Huffman
+   coding. */
+static void ChooseContextMap(int quality,
+                             uint32_t* bigram_histo,
+                             size_t* num_literal_contexts,
+                             const uint32_t** literal_context_map) {
+  static const uint32_t kStaticContextMapContinuation[64] = {
+    1, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  };
+  static const uint32_t kStaticContextMapSimpleUTF8[64] = {
+    0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  };
+
+  uint32_t monogram_histo[3] = { 0 };
+  uint32_t two_prefix_histo[6] = { 0 };
+  size_t total;
+  size_t i;
+  size_t sink;
+  double entropy[4];
+  for (i = 0; i < 9; ++i) {
+    monogram_histo[i % 3] += bigram_histo[i];
+    two_prefix_histo[i % 6] += bigram_histo[i];
+  }
+  entropy[1] = ShannonEntropy(monogram_histo, 3, &sink);
+  entropy[2] = (ShannonEntropy(two_prefix_histo, 3, &sink) +
+                ShannonEntropy(two_prefix_histo + 3, 3, &sink));
+  entropy[3] = 0;
+  for (i = 0; i < 3; ++i) {
+    entropy[3] += ShannonEntropy(bigram_histo + 3 * i, 3, &sink);
+  }
+
+  total = monogram_histo[0] + monogram_histo[1] + monogram_histo[2];
+  BROTLI_DCHECK(total != 0);
+  entropy[0] = 1.0 / (double)total;
+  entropy[1] *= entropy[0];
+  entropy[2] *= entropy[0];
+  entropy[3] *= entropy[0];
+
+  if (quality < MIN_QUALITY_FOR_HQ_CONTEXT_MODELING) {
+    /* 3 context models is a bit slower, don't use it at lower qualities. */
+    entropy[3] = entropy[1] * 10;
+  }
+  /* If expected savings by symbol are less than 0.2 bits, skip the
+     context modeling -- in exchange for faster decoding speed. */
+  if (entropy[1] - entropy[2] < 0.2 &&
+      entropy[1] - entropy[3] < 0.2) {
+    *num_literal_contexts = 1;
+  } else if (entropy[2] - entropy[3] < 0.02) {
+    *num_literal_contexts = 2;
+    *literal_context_map = kStaticContextMapSimpleUTF8;
+  } else {
+    *num_literal_contexts = 3;
+    *literal_context_map = kStaticContextMapContinuation;
+  }
+}
+
+/* Decide if we want to use a more complex static context map containing 13
+   context values, based on the entropy reduction of histograms over the
+   first 5 bits of literals. */
+static BROTLI_BOOL ShouldUseComplexStaticContextMap(const uint8_t* input,
+    size_t start_pos, size_t length, size_t mask, int quality, size_t size_hint,
+    size_t* num_literal_contexts, const uint32_t** literal_context_map,
+    uint32_t* arena) {
+  static const uint32_t kStaticContextMapComplexUTF8[64] = {
+    11, 11, 12, 12, /* 0 special */
+    0, 0, 0, 0, /* 4 lf */
+    1, 1, 9, 9, /* 8 space */
+    2, 2, 2, 2, /* !, first after space/lf and after something else. */
+    1, 1, 1, 1, /* " */
+    8, 3, 3, 3, /* % */
+    1, 1, 1, 1, /* ({[ */
+    2, 2, 2, 2, /* }]) */
+    8, 4, 4, 4, /* :; */
+    8, 7, 4, 4, /* . */
+    8, 0, 0, 0, /* > */
+    3, 3, 3, 3, /* [0..9] */
+    5, 5, 10, 5, /* [A-Z] */
+    5, 5, 10, 5,
+    6, 6, 6, 6, /* [a-z] */
+    6, 6, 6, 6,
+  };
+  BROTLI_UNUSED(quality);
+  /* Try the more complex static context map only for long data. */
+  if (size_hint < (1 << 20)) {
+    return BROTLI_FALSE;
+  } else {
+    const size_t end_pos = start_pos + length;
+    /* To make entropy calculations faster, we collect histograms
+       over the 5 most significant bits of literals. One histogram
+       without context and 13 additional histograms for each context value. */
+    uint32_t* BROTLI_RESTRICT const combined_histo = arena;
+    uint32_t* BROTLI_RESTRICT const context_histo = arena + 32;
+    uint32_t total = 0;
+    double entropy[3];
+    size_t sink;
+    size_t i;
+    ContextLut utf8_lut = BROTLI_CONTEXT_LUT(CONTEXT_UTF8);
+    memset(arena, 0, sizeof(arena[0]) * 32 * (BROTLI_MAX_STATIC_CONTEXTS + 1));
+    for (; start_pos + 64 <= end_pos; start_pos += 4096) {
+      const size_t stride_end_pos = start_pos + 64;
+      uint8_t prev2 = input[start_pos & mask];
+      uint8_t prev1 = input[(start_pos + 1) & mask];
+      size_t pos;
+      /* To make the analysis of the data faster we only examine 64 byte long
+         strides at every 4kB intervals. */
+      for (pos = start_pos + 2; pos < stride_end_pos; ++pos) {
+        const uint8_t literal = input[pos & mask];
+        const uint8_t context = (uint8_t)kStaticContextMapComplexUTF8[
+            BROTLI_CONTEXT(prev1, prev2, utf8_lut)];
+        ++total;
+        ++combined_histo[literal >> 3];
+        ++context_histo[(context << 5) + (literal >> 3)];
+        prev2 = prev1;
+        prev1 = literal;
+      }
+    }
+    entropy[1] = ShannonEntropy(combined_histo, 32, &sink);
+    entropy[2] = 0;
+    for (i = 0; i < BROTLI_MAX_STATIC_CONTEXTS; ++i) {
+      entropy[2] += ShannonEntropy(context_histo + (i << 5), 32, &sink);
+    }
+    entropy[0] = 1.0 / (double)total;
+    entropy[1] *= entropy[0];
+    entropy[2] *= entropy[0];
+    /* The triggering heuristics below were tuned by compressing the individual
+       files of the silesia corpus. If we skip this kind of context modeling
+       for not very well compressible input (i.e. entropy using context modeling
+       is 60% of maximal entropy) or if expected savings by symbol are less
+       than 0.2 bits, then in every case when it triggers, the final compression
+       ratio is improved. Note however that this heuristics might be too strict
+       for some cases and could be tuned further. */
+    if (entropy[2] > 3.0 || entropy[1] - entropy[2] < 0.2) {
+      return BROTLI_FALSE;
+    } else {
+      *num_literal_contexts = BROTLI_MAX_STATIC_CONTEXTS;
+      *literal_context_map = kStaticContextMapComplexUTF8;
+      return BROTLI_TRUE;
+    }
+  }
+}
+
+static void DecideOverLiteralContextModeling(const uint8_t* input,
+    size_t start_pos, size_t length, size_t mask, int quality, size_t size_hint,
+    size_t* num_literal_contexts, const uint32_t** literal_context_map,
+    uint32_t* arena) {
+  if (quality < MIN_QUALITY_FOR_CONTEXT_MODELING || length < 64) {
+    return;
+  } else if (ShouldUseComplexStaticContextMap(
+      input, start_pos, length, mask, quality, size_hint,
+      num_literal_contexts, literal_context_map, arena)) {
+    /* Context map was already set, nothing else to do. */
+  } else {
+    /* Gather bi-gram data of the UTF8 byte prefixes. To make the analysis of
+       UTF8 data faster we only examine 64 byte long strides at every 4kB
+       intervals. */
+    const size_t end_pos = start_pos + length;
+    uint32_t* BROTLI_RESTRICT const bigram_prefix_histo = arena;
+    memset(bigram_prefix_histo, 0, sizeof(arena[0]) * 9);
+    for (; start_pos + 64 <= end_pos; start_pos += 4096) {
+      static const int lut[4] = { 0, 0, 1, 2 };
+      const size_t stride_end_pos = start_pos + 64;
+      int prev = lut[input[start_pos & mask] >> 6] * 3;
+      size_t pos;
+      for (pos = start_pos + 1; pos < stride_end_pos; ++pos) {
+        const uint8_t literal = input[pos & mask];
+        ++bigram_prefix_histo[prev + lut[literal >> 6]];
+        prev = lut[literal >> 6] * 3;
+      }
+    }
+    ChooseContextMap(quality, &bigram_prefix_histo[0], num_literal_contexts,
+                     literal_context_map);
+  }
+}
+
+static BROTLI_BOOL ShouldCompress(
+    const uint8_t* data, const size_t mask, const uint64_t last_flush_pos,
+    const size_t bytes, const size_t num_literals, const size_t num_commands) {
+  /* TODO(eustas): find more precise minimal block overhead. */
+  if (bytes <= 2) return BROTLI_FALSE;
+  if (num_commands < (bytes >> 8) + 2) {
+    if ((double)num_literals > 0.99 * (double)bytes) {
+      uint32_t literal_histo[256] = { 0 };
+      static const uint32_t kSampleRate = 13;
+      static const double kInvSampleRate = 1.0 / 13.0;
+      static const double kMinEntropy = 7.92;
+      const double bit_cost_threshold =
+          (double)bytes * kMinEntropy * kInvSampleRate;
+      size_t t = (bytes + kSampleRate - 1) / kSampleRate;
+      uint32_t pos = (uint32_t)last_flush_pos;
+      size_t i;
+      for (i = 0; i < t; i++) {
+        ++literal_histo[data[pos & mask]];
+        pos += kSampleRate;
+      }
+      if (BitsEntropy(literal_histo, 256) > bit_cost_threshold) {
+        return BROTLI_FALSE;
+      }
+    }
+  }
+  return BROTLI_TRUE;
+}
+
+/* Chooses the literal context mode for a metablock */
+static ContextType ChooseContextMode(const BrotliEncoderParams* params,
+    const uint8_t* data, const size_t pos, const size_t mask,
+    const size_t length) {
+  /* We only do the computation for the option of something else than
+     CONTEXT_UTF8 for the highest qualities */
+  if (params->quality >= MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING &&
+      !BrotliIsMostlyUTF8(data, pos, mask, length, kMinUTF8Ratio)) {
+    return CONTEXT_SIGNED;
+  }
+  return CONTEXT_UTF8;
+}
+
+static void WriteMetaBlockInternal(MemoryManager* m,
+                                   const uint8_t* data,
+                                   const size_t mask,
+                                   const uint64_t last_flush_pos,
+                                   const size_t bytes,
+                                   const BROTLI_BOOL is_last,
+                                   ContextType literal_context_mode,
+                                   const BrotliEncoderParams* params,
+                                   const uint8_t prev_byte,
+                                   const uint8_t prev_byte2,
+                                   const size_t num_literals,
+                                   const size_t num_commands,
+                                   Command* commands,
+                                   const int* saved_dist_cache,
+                                   int* dist_cache,
+                                   size_t* storage_ix,
+                                   uint8_t* storage) {
+  const uint32_t wrapped_last_flush_pos = WrapPosition(last_flush_pos);
+  uint16_t last_bytes;
+  uint8_t last_bytes_bits;
+  ContextLut literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode);
+  BrotliEncoderParams block_params = *params;
+
+  if (bytes == 0) {
+    /* Write the ISLAST and ISEMPTY bits. */
+    BrotliWriteBits(2, 3, storage_ix, storage);
+    *storage_ix = (*storage_ix + 7u) & ~7u;
+    return;
+  }
+
+  if (!ShouldCompress(data, mask, last_flush_pos, bytes,
+                      num_literals, num_commands)) {
+    /* Restore the distance cache, as its last update by
+       CreateBackwardReferences is now unused. */
+    memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0]));
+    BrotliStoreUncompressedMetaBlock(is_last, data,
+                                     wrapped_last_flush_pos, mask, bytes,
+                                     storage_ix, storage);
+    return;
+  }
+
+  BROTLI_DCHECK(*storage_ix <= 14);
+  last_bytes = (uint16_t)((storage[1] << 8) | storage[0]);
+  last_bytes_bits = (uint8_t)(*storage_ix);
+  if (params->quality <= MAX_QUALITY_FOR_STATIC_ENTROPY_CODES) {
+    BrotliStoreMetaBlockFast(m, data, wrapped_last_flush_pos,
+                             bytes, mask, is_last, params,
+                             commands, num_commands,
+                             storage_ix, storage);
+    if (BROTLI_IS_OOM(m)) return;
+  } else if (params->quality < MIN_QUALITY_FOR_BLOCK_SPLIT) {
+    BrotliStoreMetaBlockTrivial(m, data, wrapped_last_flush_pos,
+                                bytes, mask, is_last, params,
+                                commands, num_commands,
+                                storage_ix, storage);
+    if (BROTLI_IS_OOM(m)) return;
+  } else {
+    MetaBlockSplit mb;
+    InitMetaBlockSplit(&mb);
+    if (params->quality < MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING) {
+      size_t num_literal_contexts = 1;
+      const uint32_t* literal_context_map = NULL;
+      if (!params->disable_literal_context_modeling) {
+        /* TODO(eustas): pull to higher level and reuse. */
+        uint32_t* arena =
+            BROTLI_ALLOC(m, uint32_t, 32 * (BROTLI_MAX_STATIC_CONTEXTS + 1));
+        if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(arena)) return;
+        DecideOverLiteralContextModeling(
+            data, wrapped_last_flush_pos, bytes, mask, params->quality,
+            params->size_hint, &num_literal_contexts,
+            &literal_context_map, arena);
+        BROTLI_FREE(m, arena);
+      }
+      BrotliBuildMetaBlockGreedy(m, data, wrapped_last_flush_pos, mask,
+          prev_byte, prev_byte2, literal_context_lut, num_literal_contexts,
+          literal_context_map, commands, num_commands, &mb);
+      if (BROTLI_IS_OOM(m)) return;
+    } else {
+      BrotliBuildMetaBlock(m, data, wrapped_last_flush_pos, mask, &block_params,
+                           prev_byte, prev_byte2,
+                           commands, num_commands,
+                           literal_context_mode,
+                           &mb);
+      if (BROTLI_IS_OOM(m)) return;
+    }
+    if (params->quality >= MIN_QUALITY_FOR_OPTIMIZE_HISTOGRAMS) {
+      /* The number of distance symbols effectively used for distance
+         histograms. It might be less than distance alphabet size
+         for "Large Window Brotli" (32-bit). */
+      BrotliOptimizeHistograms(block_params.dist.alphabet_size_limit, &mb);
+    }
+    BrotliStoreMetaBlock(m, data, wrapped_last_flush_pos, bytes, mask,
+                         prev_byte, prev_byte2,
+                         is_last,
+                         &block_params,
+                         literal_context_mode,
+                         commands, num_commands,
+                         &mb,
+                         storage_ix, storage);
+    if (BROTLI_IS_OOM(m)) return;
+    DestroyMetaBlockSplit(m, &mb);
+  }
+  if (bytes + 4 < (*storage_ix >> 3)) {
+    /* Restore the distance cache and last byte. */
+    memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0]));
+    storage[0] = (uint8_t)last_bytes;
+    storage[1] = (uint8_t)(last_bytes >> 8);
+    *storage_ix = last_bytes_bits;
+    BrotliStoreUncompressedMetaBlock(is_last, data,
+                                     wrapped_last_flush_pos, mask,
+                                     bytes, storage_ix, storage);
+  }
+}
+
+static void ChooseDistanceParams(BrotliEncoderParams* params) {
+  uint32_t distance_postfix_bits = 0;
+  uint32_t num_direct_distance_codes = 0;
+
+  if (params->quality >= MIN_QUALITY_FOR_NONZERO_DISTANCE_PARAMS) {
+    uint32_t ndirect_msb;
+    if (params->mode == BROTLI_MODE_FONT) {
+      distance_postfix_bits = 1;
+      num_direct_distance_codes = 12;
+    } else {
+      distance_postfix_bits = params->dist.distance_postfix_bits;
+      num_direct_distance_codes = params->dist.num_direct_distance_codes;
+    }
+    ndirect_msb = (num_direct_distance_codes >> distance_postfix_bits) & 0x0F;
+    if (distance_postfix_bits > BROTLI_MAX_NPOSTFIX ||
+        num_direct_distance_codes > BROTLI_MAX_NDIRECT ||
+        (ndirect_msb << distance_postfix_bits) != num_direct_distance_codes) {
+      distance_postfix_bits = 0;
+      num_direct_distance_codes = 0;
+    }
+  }
+
+  BrotliInitDistanceParams(&params->dist, distance_postfix_bits,
+                           num_direct_distance_codes, params->large_window);
+}
+
+static BROTLI_BOOL EnsureInitialized(BrotliEncoderState* s) {
+  MemoryManager* m = &s->memory_manager_;
+  if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+  if (s->is_initialized_) return BROTLI_TRUE;
+
+  s->last_bytes_bits_ = 0;
+  s->last_bytes_ = 0;
+  s->flint_ = BROTLI_FLINT_DONE;
+  s->remaining_metadata_bytes_ = BROTLI_UINT32_MAX;
+
+  SanitizeParams(&s->params);
+  s->params.lgblock = ComputeLgBlock(&s->params);
+  ChooseDistanceParams(&s->params);
+
+  if (s->params.stream_offset != 0) {
+    s->flint_ = BROTLI_FLINT_NEEDS_2_BYTES;
+    /* Poison the distance cache. -16 +- 3 is still less than zero (invalid). */
+    s->dist_cache_[0] = -16;
+    s->dist_cache_[1] = -16;
+    s->dist_cache_[2] = -16;
+    s->dist_cache_[3] = -16;
+    memcpy(s->saved_dist_cache_, s->dist_cache_, sizeof(s->saved_dist_cache_));
+  }
+
+  RingBufferSetup(&s->params, &s->ringbuffer_);
+
+  /* Initialize last byte with stream header. */
+  {
+    int lgwin = s->params.lgwin;
+    if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY ||
+        s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
+      lgwin = BROTLI_MAX(int, lgwin, 18);
+    }
+    if (s->params.stream_offset == 0) {
+      EncodeWindowBits(lgwin, s->params.large_window,
+                       &s->last_bytes_, &s->last_bytes_bits_);
+    } else {
+      /* Bigger values have the same effect, but could cause overflows. */
+      s->params.stream_offset = BROTLI_MIN(size_t,
+          s->params.stream_offset, BROTLI_MAX_BACKWARD_LIMIT(lgwin));
+    }
+  }
+
+  if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) {
+    s->one_pass_arena_ = BROTLI_ALLOC(m, BrotliOnePassArena, 1);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    InitCommandPrefixCodes(s->one_pass_arena_);
+  } else if (s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
+    s->two_pass_arena_ = BROTLI_ALLOC(m, BrotliTwoPassArena, 1);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+  }
+
+  s->is_initialized_ = BROTLI_TRUE;
+  return BROTLI_TRUE;
+}
+
+static void BrotliEncoderInitParams(BrotliEncoderParams* params) {
+  params->mode = BROTLI_DEFAULT_MODE;
+  params->large_window = BROTLI_FALSE;
+  params->quality = BROTLI_DEFAULT_QUALITY;
+  params->lgwin = BROTLI_DEFAULT_WINDOW;
+  params->lgblock = 0;
+  params->stream_offset = 0;
+  params->size_hint = 0;
+  params->disable_literal_context_modeling = BROTLI_FALSE;
+  BrotliInitSharedEncoderDictionary(&params->dictionary);
+  params->dist.distance_postfix_bits = 0;
+  params->dist.num_direct_distance_codes = 0;
+  params->dist.alphabet_size_max =
+      BROTLI_DISTANCE_ALPHABET_SIZE(0, 0, BROTLI_MAX_DISTANCE_BITS);
+  params->dist.alphabet_size_limit = params->dist.alphabet_size_max;
+  params->dist.max_distance = BROTLI_MAX_DISTANCE;
+}
+
+static void BrotliEncoderCleanupParams(MemoryManager* m,
+    BrotliEncoderParams* params) {
+  BrotliCleanupSharedEncoderDictionary(m, &params->dictionary);
+}
+
+#ifdef BROTLI_REPORTING
+/* When BROTLI_REPORTING is defined extra reporting module have to be linked. */
+void BrotliEncoderOnStart(const BrotliEncoderState* s);
+void BrotliEncoderOnFinish(const BrotliEncoderState* s);
+#define BROTLI_ENCODER_ON_START(s) BrotliEncoderOnStart(s);
+#define BROTLI_ENCODER_ON_FINISH(s) BrotliEncoderOnFinish(s);
+#else
+#if !defined(BROTLI_ENCODER_ON_START)
+#define BROTLI_ENCODER_ON_START(s) (void)(s);
+#endif
+#if !defined(BROTLI_ENCODER_ON_FINISH)
+#define BROTLI_ENCODER_ON_FINISH(s) (void)(s);
+#endif
+#endif
+
+static void BrotliEncoderInitState(BrotliEncoderState* s) {
+  BROTLI_ENCODER_ON_START(s);
+  BrotliEncoderInitParams(&s->params);
+  s->input_pos_ = 0;
+  s->num_commands_ = 0;
+  s->num_literals_ = 0;
+  s->last_insert_len_ = 0;
+  s->last_flush_pos_ = 0;
+  s->last_processed_pos_ = 0;
+  s->prev_byte_ = 0;
+  s->prev_byte2_ = 0;
+  s->storage_size_ = 0;
+  s->storage_ = 0;
+  HasherInit(&s->hasher_);
+  s->large_table_ = NULL;
+  s->large_table_size_ = 0;
+  s->one_pass_arena_ = NULL;
+  s->two_pass_arena_ = NULL;
+  s->command_buf_ = NULL;
+  s->literal_buf_ = NULL;
+  s->total_in_ = 0;
+  s->next_out_ = NULL;
+  s->available_out_ = 0;
+  s->total_out_ = 0;
+  s->stream_state_ = BROTLI_STREAM_PROCESSING;
+  s->is_last_block_emitted_ = BROTLI_FALSE;
+  s->is_initialized_ = BROTLI_FALSE;
+
+  RingBufferInit(&s->ringbuffer_);
+
+  s->commands_ = 0;
+  s->cmd_alloc_size_ = 0;
+
+  /* Initialize distance cache. */
+  s->dist_cache_[0] = 4;
+  s->dist_cache_[1] = 11;
+  s->dist_cache_[2] = 15;
+  s->dist_cache_[3] = 16;
+  /* Save the state of the distance cache in case we need to restore it for
+     emitting an uncompressed block. */
+  memcpy(s->saved_dist_cache_, s->dist_cache_, sizeof(s->saved_dist_cache_));
+}
+
+BrotliEncoderState* BrotliEncoderCreateInstance(
+    brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) {
+  BrotliEncoderState* state = (BrotliEncoderState*)BrotliBootstrapAlloc(
+      sizeof(BrotliEncoderState), alloc_func, free_func, opaque);
+  if (state == NULL) {
+    /* BROTLI_DUMP(); */
+    return 0;
+  }
+  BrotliInitMemoryManager(
+      &state->memory_manager_, alloc_func, free_func, opaque);
+  BrotliEncoderInitState(state);
+  return state;
+}
+
+static void BrotliEncoderCleanupState(BrotliEncoderState* s) {
+  MemoryManager* m = &s->memory_manager_;
+
+  BROTLI_ENCODER_ON_FINISH(s);
+
+  if (BROTLI_IS_OOM(m)) {
+    BrotliWipeOutMemoryManager(m);
+    return;
+  }
+
+  BROTLI_FREE(m, s->storage_);
+  BROTLI_FREE(m, s->commands_);
+  RingBufferFree(m, &s->ringbuffer_);
+  DestroyHasher(m, &s->hasher_);
+  BROTLI_FREE(m, s->large_table_);
+  BROTLI_FREE(m, s->one_pass_arena_);
+  BROTLI_FREE(m, s->two_pass_arena_);
+  BROTLI_FREE(m, s->command_buf_);
+  BROTLI_FREE(m, s->literal_buf_);
+  BrotliEncoderCleanupParams(m, &s->params);
+}
+
+/* Deinitializes and frees BrotliEncoderState instance. */
+void BrotliEncoderDestroyInstance(BrotliEncoderState* state) {
+  if (!state) {
+    return;
+  } else {
+    BrotliEncoderCleanupState(state);
+    BrotliBootstrapFree(state, &state->memory_manager_);
+  }
+}
+
+/*
+   Copies the given input data to the internal ring buffer of the compressor.
+   No processing of the data occurs at this time and this function can be
+   called multiple times before calling WriteBrotliData() to process the
+   accumulated input. At most input_block_size() bytes of input data can be
+   copied to the ring buffer, otherwise the next WriteBrotliData() will fail.
+ */
+static void CopyInputToRingBuffer(BrotliEncoderState* s,
+                                  const size_t input_size,
+                                  const uint8_t* input_buffer) {
+  RingBuffer* ringbuffer_ = &s->ringbuffer_;
+  MemoryManager* m = &s->memory_manager_;
+  RingBufferWrite(m, input_buffer, input_size, ringbuffer_);
+  if (BROTLI_IS_OOM(m)) return;
+  s->input_pos_ += input_size;
+
+  /* TL;DR: If needed, initialize 7 more bytes in the ring buffer to make the
+     hashing not depend on uninitialized data. This makes compression
+     deterministic and it prevents uninitialized memory warnings in Valgrind.
+     Even without erasing, the output would be valid (but nondeterministic).
+
+     Background information: The compressor stores short (at most 8 bytes)
+     substrings of the input already read in a hash table, and detects
+     repetitions by looking up such substrings in the hash table. If it
+     can find a substring, it checks whether the substring is really there
+     in the ring buffer (or it's just a hash collision). Should the hash
+     table become corrupt, this check makes sure that the output is
+     still valid, albeit the compression ratio would be bad.
+
+     The compressor populates the hash table from the ring buffer as it's
+     reading new bytes from the input. However, at the last few indexes of
+     the ring buffer, there are not enough bytes to build full-length
+     substrings from. Since the hash table always contains full-length
+     substrings, we overwrite with zeros here to make sure that those
+     substrings will contain zeros at the end instead of uninitialized
+     data.
+
+     Please note that erasing is not necessary (because the
+     memory region is already initialized since he ring buffer
+     has a `tail' that holds a copy of the beginning,) so we
+     skip erasing if we have already gone around at least once in
+     the ring buffer.
+
+     Only clear during the first round of ring-buffer writes. On
+     subsequent rounds data in the ring-buffer would be affected. */
+  if (ringbuffer_->pos_ <= ringbuffer_->mask_) {
+    /* This is the first time when the ring buffer is being written.
+       We clear 7 bytes just after the bytes that have been copied from
+       the input buffer.
+
+       The ring-buffer has a "tail" that holds a copy of the beginning,
+       but only once the ring buffer has been fully written once, i.e.,
+       pos <= mask. For the first time, we need to write values
+       in this tail (where index may be larger than mask), so that
+       we have exactly defined behavior and don't read uninitialized
+       memory. Due to performance reasons, hashing reads data using a
+       LOAD64, which can go 7 bytes beyond the bytes written in the
+       ring-buffer. */
+    memset(ringbuffer_->buffer_ + ringbuffer_->pos_, 0, 7);
+  }
+}
+
+/* Marks all input as processed.
+   Returns true if position wrapping occurs. */
+static BROTLI_BOOL UpdateLastProcessedPos(BrotliEncoderState* s) {
+  uint32_t wrapped_last_processed_pos = WrapPosition(s->last_processed_pos_);
+  uint32_t wrapped_input_pos = WrapPosition(s->input_pos_);
+  s->last_processed_pos_ = s->input_pos_;
+  return TO_BROTLI_BOOL(wrapped_input_pos < wrapped_last_processed_pos);
+}
+
+static void ExtendLastCommand(BrotliEncoderState* s, uint32_t* bytes,
+                              uint32_t* wrapped_last_processed_pos) {
+  Command* last_command = &s->commands_[s->num_commands_ - 1];
+  const uint8_t* data = s->ringbuffer_.buffer_;
+  const uint32_t mask = s->ringbuffer_.mask_;
+  uint64_t max_backward_distance =
+      (((uint64_t)1) << s->params.lgwin) - BROTLI_WINDOW_GAP;
+  uint64_t last_copy_len = last_command->copy_len_ & 0x1FFFFFF;
+  uint64_t last_processed_pos = s->last_processed_pos_ - last_copy_len;
+  uint64_t max_distance = last_processed_pos < max_backward_distance ?
+      last_processed_pos : max_backward_distance;
+  uint64_t cmd_dist = (uint64_t)s->dist_cache_[0];
+  uint32_t distance_code = CommandRestoreDistanceCode(last_command,
+                                                      &s->params.dist);
+  const CompoundDictionary* dict = &s->params.dictionary.compound;
+  size_t compound_dictionary_size = dict->total_size;
+  if (distance_code < BROTLI_NUM_DISTANCE_SHORT_CODES ||
+      distance_code - (BROTLI_NUM_DISTANCE_SHORT_CODES - 1) == cmd_dist) {
+    if (cmd_dist <= max_distance) {
+      while (*bytes != 0 && data[*wrapped_last_processed_pos & mask] ==
+             data[(*wrapped_last_processed_pos - cmd_dist) & mask]) {
+        last_command->copy_len_++;
+        (*bytes)--;
+        (*wrapped_last_processed_pos)++;
+      }
+    } else {
+      if ((cmd_dist - max_distance - 1) < compound_dictionary_size &&
+          last_copy_len < cmd_dist - max_distance) {
+        size_t address =
+            compound_dictionary_size - (size_t)(cmd_dist - max_distance) +
+            (size_t)last_copy_len;
+        size_t br_index = 0;
+        size_t br_offset;
+        const uint8_t* chunk;
+        size_t chunk_length;
+        while (address >= dict->chunk_offsets[br_index + 1]) br_index++;
+        br_offset = address - dict->chunk_offsets[br_index];
+        chunk = dict->chunk_source[br_index];
+        chunk_length =
+            dict->chunk_offsets[br_index + 1] - dict->chunk_offsets[br_index];
+        while (*bytes != 0 && data[*wrapped_last_processed_pos & mask] ==
+               chunk[br_offset]) {
+          last_command->copy_len_++;
+          (*bytes)--;
+          (*wrapped_last_processed_pos)++;
+          if (++br_offset == chunk_length) {
+            br_index++;
+            br_offset = 0;
+            if (br_index != dict->num_chunks) {
+              chunk = dict->chunk_source[br_index];
+              chunk_length = dict->chunk_offsets[br_index + 1] -
+                  dict->chunk_offsets[br_index];
+            } else {
+              break;
+            }
+          }
+        }
+      }
+    }
+    /* The copy length is at most the metablock size, and thus expressible. */
+    GetLengthCode(last_command->insert_len_,
+                  (size_t)((int)(last_command->copy_len_ & 0x1FFFFFF) +
+                           (int)(last_command->copy_len_ >> 25)),
+                  TO_BROTLI_BOOL((last_command->dist_prefix_ & 0x3FF) == 0),
+                  &last_command->cmd_prefix_);
+  }
+}
+
+/*
+   Processes the accumulated input data and sets |*out_size| to the length of
+   the new output meta-block, or to zero if no new output meta-block has been
+   created (in this case the processed input data is buffered internally).
+   If |*out_size| is positive, |*output| points to the start of the output
+   data. If |is_last| or |force_flush| is BROTLI_TRUE, an output meta-block is
+   always created. However, until |is_last| is BROTLI_TRUE encoder may retain up
+   to 7 bits of the last byte of output. Byte-alignment could be enforced by
+   emitting an empty meta-data block.
+   Returns BROTLI_FALSE if the size of the input data is larger than
+   input_block_size().
+ */
+static BROTLI_BOOL EncodeData(
+    BrotliEncoderState* s, const BROTLI_BOOL is_last,
+    const BROTLI_BOOL force_flush, size_t* out_size, uint8_t** output) {
+  const uint64_t delta = UnprocessedInputSize(s);
+  uint32_t bytes = (uint32_t)delta;
+  uint32_t wrapped_last_processed_pos = WrapPosition(s->last_processed_pos_);
+  uint8_t* data;
+  uint32_t mask;
+  MemoryManager* m = &s->memory_manager_;
+  ContextType literal_context_mode;
+  ContextLut literal_context_lut;
+  BROTLI_BOOL fast_compress =
+      s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY ||
+      s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY;
+
+  data = s->ringbuffer_.buffer_;
+  mask = s->ringbuffer_.mask_;
+
+  if (delta == 0) {  /* No new input; still might want to flush or finish. */
+    if (!data) {  /* No input has been processed so far. */
+      if (is_last) {  /* Emit complete finalized stream. */
+        BROTLI_DCHECK(s->last_bytes_bits_ <= 14);
+        s->last_bytes_ |= (uint16_t)(3u << s->last_bytes_bits_);
+        s->last_bytes_bits_ = (uint8_t)(s->last_bytes_bits_ + 2u);
+        s->tiny_buf_.u8[0] = (uint8_t)s->last_bytes_;
+        s->tiny_buf_.u8[1] = (uint8_t)(s->last_bytes_ >> 8);
+        *output = s->tiny_buf_.u8;
+        *out_size = (s->last_bytes_bits_ + 7u) >> 3u;
+        return BROTLI_TRUE;
+      } else {  /* No data, not last -> no-op. */
+        *out_size = 0;
+        return BROTLI_TRUE;
+      }
+    } else {
+      /* Fast compress performs flush every block -> flush is no-op. */
+      if (!is_last && (!force_flush || fast_compress)) {  /* Another no-op. */
+        *out_size = 0;
+        return BROTLI_TRUE;
+      }
+    }
+  }
+  BROTLI_DCHECK(data);
+
+  if (s->params.quality > s->params.dictionary.max_quality) return BROTLI_FALSE;
+  /* Adding more blocks after "last" block is forbidden. */
+  if (s->is_last_block_emitted_) return BROTLI_FALSE;
+  if (is_last) s->is_last_block_emitted_ = BROTLI_TRUE;
+
+  if (delta > InputBlockSize(s)) {
+    return BROTLI_FALSE;
+  }
+  if (s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY &&
+      !s->command_buf_) {
+    s->command_buf_ =
+        BROTLI_ALLOC(m, uint32_t, kCompressFragmentTwoPassBlockSize);
+    s->literal_buf_ =
+        BROTLI_ALLOC(m, uint8_t, kCompressFragmentTwoPassBlockSize);
+    if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(s->command_buf_) ||
+        BROTLI_IS_NULL(s->literal_buf_)) {
+      return BROTLI_FALSE;
+    }
+  }
+
+  if (fast_compress) {
+    uint8_t* storage;
+    size_t storage_ix = s->last_bytes_bits_;
+    size_t table_size;
+    int* table;
+
+    storage = GetBrotliStorage(s, 2 * bytes + 503);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    storage[0] = (uint8_t)s->last_bytes_;
+    storage[1] = (uint8_t)(s->last_bytes_ >> 8);
+    table = GetHashTable(s, s->params.quality, bytes, &table_size);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) {
+      BrotliCompressFragmentFast(
+          s->one_pass_arena_, &data[wrapped_last_processed_pos & mask],
+          bytes, is_last,
+          table, table_size,
+          &storage_ix, storage);
+      if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    } else {
+      BrotliCompressFragmentTwoPass(
+          s->two_pass_arena_, &data[wrapped_last_processed_pos & mask],
+          bytes, is_last,
+          s->command_buf_, s->literal_buf_,
+          table, table_size,
+          &storage_ix, storage);
+      if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    }
+    s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]);
+    s->last_bytes_bits_ = storage_ix & 7u;
+    UpdateLastProcessedPos(s);
+    *output = &storage[0];
+    *out_size = storage_ix >> 3;
+    return BROTLI_TRUE;
+  }
+
+  {
+    /* Theoretical max number of commands is 1 per 2 bytes. */
+    size_t newsize = s->num_commands_ + bytes / 2 + 1;
+    if (newsize > s->cmd_alloc_size_) {
+      Command* new_commands;
+      /* Reserve a bit more memory to allow merging with a next block
+         without reallocation: that would impact speed. */
+      newsize += (bytes / 4) + 16;
+      s->cmd_alloc_size_ = newsize;
+      new_commands = BROTLI_ALLOC(m, Command, newsize);
+      if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(new_commands)) return BROTLI_FALSE;
+      if (s->commands_) {
+        memcpy(new_commands, s->commands_, sizeof(Command) * s->num_commands_);
+        BROTLI_FREE(m, s->commands_);
+      }
+      s->commands_ = new_commands;
+    }
+  }
+
+  InitOrStitchToPreviousBlock(m, &s->hasher_, data, mask, &s->params,
+      wrapped_last_processed_pos, bytes, is_last);
+
+  literal_context_mode = ChooseContextMode(
+      &s->params, data, WrapPosition(s->last_flush_pos_),
+      mask, (size_t)(s->input_pos_ - s->last_flush_pos_));
+  literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode);
+
+  if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+
+  if (s->num_commands_ && s->last_insert_len_ == 0) {
+    ExtendLastCommand(s, &bytes, &wrapped_last_processed_pos);
+  }
+
+  if (s->params.quality == ZOPFLIFICATION_QUALITY) {
+    BROTLI_DCHECK(s->params.hasher.type == 10);
+    BrotliCreateZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos,
+        data, mask, literal_context_lut, &s->params,
+        &s->hasher_, s->dist_cache_,
+        &s->last_insert_len_, &s->commands_[s->num_commands_],
+        &s->num_commands_, &s->num_literals_);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+  } else if (s->params.quality == HQ_ZOPFLIFICATION_QUALITY) {
+    BROTLI_DCHECK(s->params.hasher.type == 10);
+    BrotliCreateHqZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos,
+        data, mask, literal_context_lut, &s->params,
+        &s->hasher_, s->dist_cache_,
+        &s->last_insert_len_, &s->commands_[s->num_commands_],
+        &s->num_commands_, &s->num_literals_);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+  } else {
+    BrotliCreateBackwardReferences(bytes, wrapped_last_processed_pos,
+        data, mask, literal_context_lut, &s->params,
+        &s->hasher_, s->dist_cache_,
+        &s->last_insert_len_, &s->commands_[s->num_commands_],
+        &s->num_commands_, &s->num_literals_);
+  }
+
+  {
+    const size_t max_length = MaxMetablockSize(&s->params);
+    const size_t max_literals = max_length / 8;
+    const size_t max_commands = max_length / 8;
+    const size_t processed_bytes = (size_t)(s->input_pos_ - s->last_flush_pos_);
+    /* If maximal possible additional block doesn't fit metablock, flush now. */
+    /* TODO(eustas): Postpone decision until next block arrives? */
+    const BROTLI_BOOL next_input_fits_metablock = TO_BROTLI_BOOL(
+        processed_bytes + InputBlockSize(s) <= max_length);
+    /* If block splitting is not used, then flush as soon as there is some
+       amount of commands / literals produced. */
+    const BROTLI_BOOL should_flush = TO_BROTLI_BOOL(
+        s->params.quality < MIN_QUALITY_FOR_BLOCK_SPLIT &&
+        s->num_literals_ + s->num_commands_ >= MAX_NUM_DELAYED_SYMBOLS);
+    if (!is_last && !force_flush && !should_flush &&
+        next_input_fits_metablock &&
+        s->num_literals_ < max_literals &&
+        s->num_commands_ < max_commands) {
+      /* Merge with next input block. Everything will happen later. */
+      if (UpdateLastProcessedPos(s)) {
+        HasherReset(&s->hasher_);
+      }
+      *out_size = 0;
+      return BROTLI_TRUE;
+    }
+  }
+
+  /* Create the last insert-only command. */
+  if (s->last_insert_len_ > 0) {
+    InitInsertCommand(&s->commands_[s->num_commands_++], s->last_insert_len_);
+    s->num_literals_ += s->last_insert_len_;
+    s->last_insert_len_ = 0;
+  }
+
+  if (!is_last && s->input_pos_ == s->last_flush_pos_) {
+    /* We have no new input data and we don't have to finish the stream, so
+       nothing to do. */
+    *out_size = 0;
+    return BROTLI_TRUE;
+  }
+  BROTLI_DCHECK(s->input_pos_ >= s->last_flush_pos_);
+  BROTLI_DCHECK(s->input_pos_ > s->last_flush_pos_ || is_last);
+  BROTLI_DCHECK(s->input_pos_ - s->last_flush_pos_ <= 1u << 24);
+  {
+    const uint32_t metablock_size =
+        (uint32_t)(s->input_pos_ - s->last_flush_pos_);
+    uint8_t* storage = GetBrotliStorage(s, 2 * metablock_size + 503);
+    size_t storage_ix = s->last_bytes_bits_;
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    storage[0] = (uint8_t)s->last_bytes_;
+    storage[1] = (uint8_t)(s->last_bytes_ >> 8);
+    WriteMetaBlockInternal(
+        m, data, mask, s->last_flush_pos_, metablock_size, is_last,
+        literal_context_mode, &s->params, s->prev_byte_, s->prev_byte2_,
+        s->num_literals_, s->num_commands_, s->commands_, s->saved_dist_cache_,
+        s->dist_cache_, &storage_ix, storage);
+    if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+    s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]);
+    s->last_bytes_bits_ = storage_ix & 7u;
+    s->last_flush_pos_ = s->input_pos_;
+    if (UpdateLastProcessedPos(s)) {
+      HasherReset(&s->hasher_);
+    }
+    if (s->last_flush_pos_ > 0) {
+      s->prev_byte_ = data[((uint32_t)s->last_flush_pos_ - 1) & mask];
+    }
+    if (s->last_flush_pos_ > 1) {
+      s->prev_byte2_ = data[(uint32_t)(s->last_flush_pos_ - 2) & mask];
+    }
+    s->num_commands_ = 0;
+    s->num_literals_ = 0;
+    /* Save the state of the distance cache in case we need to restore it for
+       emitting an uncompressed block. */
+    memcpy(s->saved_dist_cache_, s->dist_cache_, sizeof(s->saved_dist_cache_));
+    *output = &storage[0];
+    *out_size = storage_ix >> 3;
+    return BROTLI_TRUE;
+  }
+}
+
+/* Dumps remaining output bits and metadata header to |header|.
+   Returns number of produced bytes.
+   REQUIRED: |header| should be 8-byte aligned and at least 16 bytes long.
+   REQUIRED: |block_size| <= (1 << 24). */
+static size_t WriteMetadataHeader(
+    BrotliEncoderState* s, const size_t block_size, uint8_t* header) {
+  size_t storage_ix;
+  storage_ix = s->last_bytes_bits_;
+  header[0] = (uint8_t)s->last_bytes_;
+  header[1] = (uint8_t)(s->last_bytes_ >> 8);
+  s->last_bytes_ = 0;
+  s->last_bytes_bits_ = 0;
+
+  BrotliWriteBits(1, 0, &storage_ix, header);
+  BrotliWriteBits(2, 3, &storage_ix, header);
+  BrotliWriteBits(1, 0, &storage_ix, header);
+  if (block_size == 0) {
+    BrotliWriteBits(2, 0, &storage_ix, header);
+  } else {
+    uint32_t nbits = (block_size == 1) ? 1 :
+        (Log2FloorNonZero((uint32_t)block_size - 1) + 1);
+    uint32_t nbytes = (nbits + 7) / 8;
+    BrotliWriteBits(2, nbytes, &storage_ix, header);
+    BrotliWriteBits(8 * nbytes, block_size - 1, &storage_ix, header);
+  }
+  return (storage_ix + 7u) >> 3;
+}
+
+size_t BrotliEncoderMaxCompressedSize(size_t input_size) {
+  /* [window bits / empty metadata] + N * [uncompressed] + [last empty] */
+  size_t num_large_blocks = input_size >> 14;
+  size_t overhead = 2 + (4 * num_large_blocks) + 3 + 1;
+  size_t result = input_size + overhead;
+  if (input_size == 0) return 2;
+  return (result < input_size) ? 0 : result;
+}
+
+/* Wraps data to uncompressed brotli stream with minimal window size.
+   |output| should point at region with at least BrotliEncoderMaxCompressedSize
+   addressable bytes.
+   Returns the length of stream. */
+static size_t MakeUncompressedStream(
+    const uint8_t* input, size_t input_size, uint8_t* output) {
+  size_t size = input_size;
+  size_t result = 0;
+  size_t offset = 0;
+  if (input_size == 0) {
+    output[0] = 6;
+    return 1;
+  }
+  output[result++] = 0x21;  /* window bits = 10, is_last = false */
+  output[result++] = 0x03;  /* empty metadata, padding */
+  while (size > 0) {
+    uint32_t nibbles = 0;
+    uint32_t chunk_size;
+    uint32_t bits;
+    chunk_size = (size > (1u << 24)) ? (1u << 24) : (uint32_t)size;
+    if (chunk_size > (1u << 16)) nibbles = (chunk_size > (1u << 20)) ? 2 : 1;
+    bits =
+        (nibbles << 1) | ((chunk_size - 1) << 3) | (1u << (19 + 4 * nibbles));
+    output[result++] = (uint8_t)bits;
+    output[result++] = (uint8_t)(bits >> 8);
+    output[result++] = (uint8_t)(bits >> 16);
+    if (nibbles == 2) output[result++] = (uint8_t)(bits >> 24);
+    memcpy(&output[result], &input[offset], chunk_size);
+    result += chunk_size;
+    offset += chunk_size;
+    size -= chunk_size;
+  }
+  output[result++] = 3;
+  return result;
+}
+
+BROTLI_BOOL BrotliEncoderCompress(
+    int quality, int lgwin, BrotliEncoderMode mode, size_t input_size,
+    const uint8_t input_buffer[BROTLI_ARRAY_PARAM(input_size)],
+    size_t* encoded_size,
+    uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(*encoded_size)]) {
+  BrotliEncoderState* s;
+  size_t out_size = *encoded_size;
+  const uint8_t* input_start = input_buffer;
+  uint8_t* output_start = encoded_buffer;
+  size_t max_out_size = BrotliEncoderMaxCompressedSize(input_size);
+  if (out_size == 0) {
+    /* Output buffer needs at least one byte. */
+    return BROTLI_FALSE;
+  }
+  if (input_size == 0) {
+    /* Handle the special case of empty input. */
+    *encoded_size = 1;
+    *encoded_buffer = 6;
+    return BROTLI_TRUE;
+  }
+
+  s = BrotliEncoderCreateInstance(0, 0, 0);
+  if (!s) {
+    return BROTLI_FALSE;
+  } else {
+    size_t available_in = input_size;
+    const uint8_t* next_in = input_buffer;
+    size_t available_out = *encoded_size;
+    uint8_t* next_out = encoded_buffer;
+    size_t total_out = 0;
+    BROTLI_BOOL result = BROTLI_FALSE;
+    /* TODO(eustas): check that parameters are sane. */
+    BrotliEncoderSetParameter(s, BROTLI_PARAM_QUALITY, (uint32_t)quality);
+    BrotliEncoderSetParameter(s, BROTLI_PARAM_LGWIN, (uint32_t)lgwin);
+    BrotliEncoderSetParameter(s, BROTLI_PARAM_MODE, (uint32_t)mode);
+    BrotliEncoderSetParameter(s, BROTLI_PARAM_SIZE_HINT, (uint32_t)input_size);
+    if (lgwin > BROTLI_MAX_WINDOW_BITS) {
+      BrotliEncoderSetParameter(s, BROTLI_PARAM_LARGE_WINDOW, BROTLI_TRUE);
+    }
+    result = BrotliEncoderCompressStream(s, BROTLI_OPERATION_FINISH,
+        &available_in, &next_in, &available_out, &next_out, &total_out);
+    if (!BrotliEncoderIsFinished(s)) result = 0;
+    *encoded_size = total_out;
+    BrotliEncoderDestroyInstance(s);
+    if (!result || (max_out_size && *encoded_size > max_out_size)) {
+      goto fallback;
+    }
+    return BROTLI_TRUE;
+  }
+fallback:
+  *encoded_size = 0;
+  if (!max_out_size) return BROTLI_FALSE;
+  if (out_size >= max_out_size) {
+    *encoded_size =
+        MakeUncompressedStream(input_start, input_size, output_start);
+    return BROTLI_TRUE;
+  }
+  return BROTLI_FALSE;
+}
+
+static void InjectBytePaddingBlock(BrotliEncoderState* s) {
+  uint32_t seal = s->last_bytes_;
+  size_t seal_bits = s->last_bytes_bits_;
+  uint8_t* destination;
+  s->last_bytes_ = 0;
+  s->last_bytes_bits_ = 0;
+  /* is_last = 0, data_nibbles = 11, reserved = 0, meta_nibbles = 00 */
+  seal |= 0x6u << seal_bits;
+  seal_bits += 6;
+  /* If we have already created storage, then append to it.
+     Storage is valid until next block is being compressed. */
+  if (s->next_out_) {
+    destination = s->next_out_ + s->available_out_;
+  } else {
+    destination = s->tiny_buf_.u8;
+    s->next_out_ = destination;
+  }
+  destination[0] = (uint8_t)seal;
+  if (seal_bits > 8) destination[1] = (uint8_t)(seal >> 8);
+  if (seal_bits > 16) destination[2] = (uint8_t)(seal >> 16);
+  s->available_out_ += (seal_bits + 7) >> 3;
+}
+
+/* Fills the |total_out|, if it is not NULL. */
+static void SetTotalOut(BrotliEncoderState* s, size_t* total_out) {
+  if (total_out) {
+    /* Saturating conversion uint64_t -> size_t */
+    size_t result = (size_t)-1;
+    if (s->total_out_ < result) {
+      result = (size_t)s->total_out_;
+    }
+    *total_out = result;
+  }
+}
+
+/* Injects padding bits or pushes compressed data to output.
+   Returns false if nothing is done. */
+static BROTLI_BOOL InjectFlushOrPushOutput(BrotliEncoderState* s,
+    size_t* available_out, uint8_t** next_out, size_t* total_out) {
+  if (s->stream_state_ == BROTLI_STREAM_FLUSH_REQUESTED &&
+      s->last_bytes_bits_ != 0) {
+    InjectBytePaddingBlock(s);
+    return BROTLI_TRUE;
+  }
+
+  if (s->available_out_ != 0 && *available_out != 0) {
+    size_t copy_output_size =
+        BROTLI_MIN(size_t, s->available_out_, *available_out);
+    memcpy(*next_out, s->next_out_, copy_output_size);
+    *next_out += copy_output_size;
+    *available_out -= copy_output_size;
+    s->next_out_ += copy_output_size;
+    s->available_out_ -= copy_output_size;
+    s->total_out_ += copy_output_size;
+    SetTotalOut(s, total_out);
+    return BROTLI_TRUE;
+  }
+
+  return BROTLI_FALSE;
+}
+
+static void CheckFlushComplete(BrotliEncoderState* s) {
+  if (s->stream_state_ == BROTLI_STREAM_FLUSH_REQUESTED &&
+      s->available_out_ == 0) {
+    s->stream_state_ = BROTLI_STREAM_PROCESSING;
+    s->next_out_ = 0;
+  }
+}
+
+static BROTLI_BOOL BrotliEncoderCompressStreamFast(
+    BrotliEncoderState* s, BrotliEncoderOperation op, size_t* available_in,
+    const uint8_t** next_in, size_t* available_out, uint8_t** next_out,
+    size_t* total_out) {
+  const size_t block_size_limit = (size_t)1 << s->params.lgwin;
+  const size_t buf_size = BROTLI_MIN(size_t, kCompressFragmentTwoPassBlockSize,
+      BROTLI_MIN(size_t, *available_in, block_size_limit));
+  uint32_t* tmp_command_buf = NULL;
+  uint32_t* command_buf = NULL;
+  uint8_t* tmp_literal_buf = NULL;
+  uint8_t* literal_buf = NULL;
+  MemoryManager* m = &s->memory_manager_;
+  if (s->params.quality != FAST_ONE_PASS_COMPRESSION_QUALITY &&
+      s->params.quality != FAST_TWO_PASS_COMPRESSION_QUALITY) {
+    return BROTLI_FALSE;
+  }
+  if (s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
+    if (!s->command_buf_ && buf_size == kCompressFragmentTwoPassBlockSize) {
+      s->command_buf_ =
+          BROTLI_ALLOC(m, uint32_t, kCompressFragmentTwoPassBlockSize);
+      s->literal_buf_ =
+          BROTLI_ALLOC(m, uint8_t, kCompressFragmentTwoPassBlockSize);
+      if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(s->command_buf_) ||
+          BROTLI_IS_NULL(s->literal_buf_)) {
+        return BROTLI_FALSE;
+      }
+    }
+    if (s->command_buf_) {
+      command_buf = s->command_buf_;
+      literal_buf = s->literal_buf_;
+    } else {
+      tmp_command_buf = BROTLI_ALLOC(m, uint32_t, buf_size);
+      tmp_literal_buf = BROTLI_ALLOC(m, uint8_t, buf_size);
+      if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(tmp_command_buf) ||
+          BROTLI_IS_NULL(tmp_literal_buf)) {
+        return BROTLI_FALSE;
+      }
+      command_buf = tmp_command_buf;
+      literal_buf = tmp_literal_buf;
+    }
+  }
+
+  while (BROTLI_TRUE) {
+    if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) {
+      continue;
+    }
+
+    /* Compress block only when internal output buffer is empty, stream is not
+       finished, there is no pending flush request, and there is either
+       additional input or pending operation. */
+    if (s->available_out_ == 0 &&
+        s->stream_state_ == BROTLI_STREAM_PROCESSING &&
+        (*available_in != 0 || op != BROTLI_OPERATION_PROCESS)) {
+      size_t block_size = BROTLI_MIN(size_t, block_size_limit, *available_in);
+      BROTLI_BOOL is_last =
+          (*available_in == block_size) && (op == BROTLI_OPERATION_FINISH);
+      BROTLI_BOOL force_flush =
+          (*available_in == block_size) && (op == BROTLI_OPERATION_FLUSH);
+      size_t max_out_size = 2 * block_size + 503;
+      BROTLI_BOOL inplace = BROTLI_TRUE;
+      uint8_t* storage = NULL;
+      size_t storage_ix = s->last_bytes_bits_;
+      size_t table_size;
+      int* table;
+
+      if (force_flush && block_size == 0) {
+        s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED;
+        continue;
+      }
+      if (max_out_size <= *available_out) {
+        storage = *next_out;
+      } else {
+        inplace = BROTLI_FALSE;
+        storage = GetBrotliStorage(s, max_out_size);
+        if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+      }
+      storage[0] = (uint8_t)s->last_bytes_;
+      storage[1] = (uint8_t)(s->last_bytes_ >> 8);
+      table = GetHashTable(s, s->params.quality, block_size, &table_size);
+      if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+
+      if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) {
+        BrotliCompressFragmentFast(s->one_pass_arena_, *next_in, block_size,
+            is_last, table, table_size, &storage_ix, storage);
+        if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+      } else {
+        BrotliCompressFragmentTwoPass(s->two_pass_arena_, *next_in, block_size,
+            is_last, command_buf, literal_buf, table, table_size,
+            &storage_ix, storage);
+        if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+      }
+      if (block_size != 0) {
+        *next_in += block_size;
+        *available_in -= block_size;
+        s->total_in_ += block_size;
+      }
+      if (inplace) {
+        size_t out_bytes = storage_ix >> 3;
+        BROTLI_DCHECK(out_bytes <= *available_out);
+        BROTLI_DCHECK((storage_ix & 7) == 0 || out_bytes < *available_out);
+        *next_out += out_bytes;
+        *available_out -= out_bytes;
+        s->total_out_ += out_bytes;
+        SetTotalOut(s, total_out);
+      } else {
+        size_t out_bytes = storage_ix >> 3;
+        s->next_out_ = storage;
+        s->available_out_ = out_bytes;
+      }
+      s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]);
+      s->last_bytes_bits_ = storage_ix & 7u;
+
+      if (force_flush) s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED;
+      if (is_last) s->stream_state_ = BROTLI_STREAM_FINISHED;
+      continue;
+    }
+    break;
+  }
+  BROTLI_FREE(m, tmp_command_buf);
+  BROTLI_FREE(m, tmp_literal_buf);
+  CheckFlushComplete(s);
+  return BROTLI_TRUE;
+}
+
+static BROTLI_BOOL ProcessMetadata(
+    BrotliEncoderState* s, size_t* available_in, const uint8_t** next_in,
+    size_t* available_out, uint8_t** next_out, size_t* total_out) {
+  if (*available_in > (1u << 24)) return BROTLI_FALSE;
+  /* Switch to metadata block workflow, if required. */
+  if (s->stream_state_ == BROTLI_STREAM_PROCESSING) {
+    s->remaining_metadata_bytes_ = (uint32_t)*available_in;
+    s->stream_state_ = BROTLI_STREAM_METADATA_HEAD;
+  }
+  if (s->stream_state_ != BROTLI_STREAM_METADATA_HEAD &&
+      s->stream_state_ != BROTLI_STREAM_METADATA_BODY) {
+    return BROTLI_FALSE;
+  }
+
+  while (BROTLI_TRUE) {
+    if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) {
+      continue;
+    }
+    if (s->available_out_ != 0) break;
+
+    if (s->input_pos_ != s->last_flush_pos_) {
+      BROTLI_BOOL result = EncodeData(s, BROTLI_FALSE, BROTLI_TRUE,
+          &s->available_out_, &s->next_out_);
+      if (!result) return BROTLI_FALSE;
+      continue;
+    }
+
+    if (s->stream_state_ == BROTLI_STREAM_METADATA_HEAD) {
+      s->next_out_ = s->tiny_buf_.u8;
+      s->available_out_ =
+          WriteMetadataHeader(s, s->remaining_metadata_bytes_, s->next_out_);
+      s->stream_state_ = BROTLI_STREAM_METADATA_BODY;
+      continue;
+    } else {
+      /* Exit workflow only when there is no more input and no more output.
+         Otherwise client may continue producing empty metadata blocks. */
+      if (s->remaining_metadata_bytes_ == 0) {
+        s->remaining_metadata_bytes_ = BROTLI_UINT32_MAX;
+        s->stream_state_ = BROTLI_STREAM_PROCESSING;
+        break;
+      }
+      if (*available_out) {
+        /* Directly copy input to output. */
+        uint32_t copy = (uint32_t)BROTLI_MIN(
+            size_t, s->remaining_metadata_bytes_, *available_out);
+        memcpy(*next_out, *next_in, copy);
+        *next_in += copy;
+        *available_in -= copy;
+        s->total_in_ += copy;  /* not actually data input, though */
+        s->remaining_metadata_bytes_ -= copy;
+        *next_out += copy;
+        *available_out -= copy;
+      } else {
+        /* This guarantees progress in "TakeOutput" workflow. */
+        uint32_t copy = BROTLI_MIN(uint32_t, s->remaining_metadata_bytes_, 16);
+        s->next_out_ = s->tiny_buf_.u8;
+        memcpy(s->next_out_, *next_in, copy);
+        *next_in += copy;
+        *available_in -= copy;
+        s->total_in_ += copy;  /* not actually data input, though */
+        s->remaining_metadata_bytes_ -= copy;
+        s->available_out_ = copy;
+      }
+      continue;
+    }
+  }
+
+  return BROTLI_TRUE;
+}
+
+static void UpdateSizeHint(BrotliEncoderState* s, size_t available_in) {
+  if (s->params.size_hint == 0) {
+    uint64_t delta = UnprocessedInputSize(s);
+    uint64_t tail = available_in;
+    uint32_t limit = 1u << 30;
+    uint32_t total;
+    if ((delta >= limit) || (tail >= limit) || ((delta + tail) >= limit)) {
+      total = limit;
+    } else {
+      total = (uint32_t)(delta + tail);
+    }
+    s->params.size_hint = total;
+  }
+}
+
+BROTLI_BOOL BrotliEncoderCompressStream(
+    BrotliEncoderState* s, BrotliEncoderOperation op, size_t* available_in,
+    const uint8_t** next_in, size_t* available_out, uint8_t** next_out,
+    size_t* total_out) {
+  if (!EnsureInitialized(s)) return BROTLI_FALSE;
+
+  /* Unfinished metadata block; check requirements. */
+  if (s->remaining_metadata_bytes_ != BROTLI_UINT32_MAX) {
+    if (*available_in != s->remaining_metadata_bytes_) return BROTLI_FALSE;
+    if (op != BROTLI_OPERATION_EMIT_METADATA) return BROTLI_FALSE;
+  }
+
+  if (op == BROTLI_OPERATION_EMIT_METADATA) {
+    UpdateSizeHint(s, 0);  /* First data metablock might be emitted here. */
+    return ProcessMetadata(
+        s, available_in, next_in, available_out, next_out, total_out);
+  }
+
+  if (s->stream_state_ == BROTLI_STREAM_METADATA_HEAD ||
+      s->stream_state_ == BROTLI_STREAM_METADATA_BODY) {
+    return BROTLI_FALSE;
+  }
+
+  if (s->stream_state_ != BROTLI_STREAM_PROCESSING && *available_in != 0) {
+    return BROTLI_FALSE;
+  }
+  if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY ||
+      s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
+    return BrotliEncoderCompressStreamFast(s, op, available_in, next_in,
+        available_out, next_out, total_out);
+  }
+  while (BROTLI_TRUE) {
+    size_t remaining_block_size = RemainingInputBlockSize(s);
+    /* Shorten input to flint size. */
+    if (s->flint_ >= 0 && remaining_block_size > (size_t)s->flint_) {
+      remaining_block_size = (size_t)s->flint_;
+    }
+
+    if (remaining_block_size != 0 && *available_in != 0) {
+      size_t copy_input_size =
+          BROTLI_MIN(size_t, remaining_block_size, *available_in);
+      CopyInputToRingBuffer(s, copy_input_size, *next_in);
+      *next_in += copy_input_size;
+      *available_in -= copy_input_size;
+      s->total_in_ += copy_input_size;
+      if (s->flint_ > 0) s->flint_ = (int8_t)(s->flint_ - (int)copy_input_size);
+      continue;
+    }
+
+    if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) {
+      /* Exit the "emit flint" workflow. */
+      if (s->flint_ == BROTLI_FLINT_WAITING_FOR_FLUSHING) {
+        CheckFlushComplete(s);
+        if (s->stream_state_ == BROTLI_STREAM_PROCESSING) {
+          s->flint_ = BROTLI_FLINT_DONE;
+        }
+      }
+      continue;
+    }
+
+    /* Compress data only when internal output buffer is empty, stream is not
+       finished and there is no pending flush request. */
+    if (s->available_out_ == 0 &&
+        s->stream_state_ == BROTLI_STREAM_PROCESSING) {
+      if (remaining_block_size == 0 || op != BROTLI_OPERATION_PROCESS) {
+        BROTLI_BOOL is_last = TO_BROTLI_BOOL(
+            (*available_in == 0) && op == BROTLI_OPERATION_FINISH);
+        BROTLI_BOOL force_flush = TO_BROTLI_BOOL(
+            (*available_in == 0) && op == BROTLI_OPERATION_FLUSH);
+        BROTLI_BOOL result;
+        /* Force emitting (uncompressed) piece containing flint. */
+        if (!is_last && s->flint_ == 0) {
+          s->flint_ = BROTLI_FLINT_WAITING_FOR_FLUSHING;
+          force_flush = BROTLI_TRUE;
+        }
+        UpdateSizeHint(s, *available_in);
+        result = EncodeData(s, is_last, force_flush,
+            &s->available_out_, &s->next_out_);
+        if (!result) return BROTLI_FALSE;
+        if (force_flush) s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED;
+        if (is_last) s->stream_state_ = BROTLI_STREAM_FINISHED;
+        continue;
+      }
+    }
+    break;
+  }
+  CheckFlushComplete(s);
+  return BROTLI_TRUE;
+}
+
+BROTLI_BOOL BrotliEncoderIsFinished(BrotliEncoderState* s) {
+  return TO_BROTLI_BOOL(s->stream_state_ == BROTLI_STREAM_FINISHED &&
+      !BrotliEncoderHasMoreOutput(s));
+}
+
+BROTLI_BOOL BrotliEncoderHasMoreOutput(BrotliEncoderState* s) {
+  return TO_BROTLI_BOOL(s->available_out_ != 0);
+}
+
+const uint8_t* BrotliEncoderTakeOutput(BrotliEncoderState* s, size_t* size) {
+  size_t consumed_size = s->available_out_;
+  uint8_t* result = s->next_out_;
+  if (*size) {
+    consumed_size = BROTLI_MIN(size_t, *size, s->available_out_);
+  }
+  if (consumed_size) {
+    s->next_out_ += consumed_size;
+    s->available_out_ -= consumed_size;
+    s->total_out_ += consumed_size;
+    CheckFlushComplete(s);
+    *size = consumed_size;
+  } else {
+    *size = 0;
+    result = 0;
+  }
+  return result;
+}
+
+uint32_t BrotliEncoderVersion(void) {
+  return BROTLI_VERSION;
+}
+
+BrotliEncoderPreparedDictionary* BrotliEncoderPrepareDictionary(
+    BrotliSharedDictionaryType type, size_t size,
+    const uint8_t data[BROTLI_ARRAY_PARAM(size)], int quality,
+    brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) {
+  ManagedDictionary* managed_dictionary = NULL;
+  BROTLI_BOOL type_is_known = BROTLI_FALSE;
+  type_is_known |= (type == BROTLI_SHARED_DICTIONARY_RAW);
+#if defined(BROTLI_EXPERIMENTAL)
+  type_is_known |= (type == BROTLI_SHARED_DICTIONARY_SERIALIZED);
+#endif  /* BROTLI_EXPERIMENTAL */
+  if (!type_is_known) {
+    return NULL;
+  }
+  managed_dictionary =
+      BrotliCreateManagedDictionary(alloc_func, free_func, opaque);
+  if (managed_dictionary == NULL) {
+    return NULL;
+  }
+  if (type == BROTLI_SHARED_DICTIONARY_RAW) {
+    managed_dictionary->dictionary = (uint32_t*)CreatePreparedDictionary(
+        &managed_dictionary->memory_manager_, data, size);
+  }
+#if defined(BROTLI_EXPERIMENTAL)
+  if (type == BROTLI_SHARED_DICTIONARY_SERIALIZED) {
+    SharedEncoderDictionary* dict = (SharedEncoderDictionary*)BrotliAllocate(
+        &managed_dictionary->memory_manager_, sizeof(SharedEncoderDictionary));
+    managed_dictionary->dictionary = (uint32_t*)dict;
+    if (dict != NULL) {
+      BROTLI_BOOL ok = BrotliInitCustomSharedEncoderDictionary(
+          &managed_dictionary->memory_manager_, data, size, quality, dict);
+      if (!ok) {
+        BrotliFree(&managed_dictionary->memory_manager_, dict);
+        managed_dictionary->dictionary = NULL;
+      }
+    }
+  }
+#else  /* BROTLI_EXPERIMENTAL */
+  (void)quality;
+#endif  /* BROTLI_EXPERIMENTAL */
+  if (managed_dictionary->dictionary == NULL) {
+    BrotliDestroyManagedDictionary(managed_dictionary);
+    return NULL;
+  }
+  return (BrotliEncoderPreparedDictionary*)managed_dictionary;
+}
+
+void BrotliEncoderDestroyPreparedDictionary(
+    BrotliEncoderPreparedDictionary* dictionary) {
+  ManagedDictionary* dict = (ManagedDictionary*)dictionary;
+  if (!dictionary) return;
+  /* First field of dictionary structs. */
+  /* Only managed dictionaries are eligible for destruction by this method. */
+  if (dict->magic != kManagedDictionaryMagic) {
+    return;
+  }
+  if (dict->dictionary == NULL) {
+    /* This should never ever happen. */
+  } else if (*dict->dictionary == kLeanPreparedDictionaryMagic) {
+    DestroyPreparedDictionary(
+        &dict->memory_manager_, (PreparedDictionary*)dict->dictionary);
+  } else if (*dict->dictionary == kSharedDictionaryMagic) {
+    BrotliCleanupSharedEncoderDictionary(&dict->memory_manager_,
+        (SharedEncoderDictionary*)dict->dictionary);
+    BrotliFree(&dict->memory_manager_, dict->dictionary);
+  } else {
+    /* There is also kPreparedDictionaryMagic, but such instances should be
+     * constructed and destroyed by different means. */
+  }
+  dict->dictionary = NULL;
+  BrotliDestroyManagedDictionary(dict);
+}
+
+BROTLI_BOOL BrotliEncoderAttachPreparedDictionary(BrotliEncoderState* state,
+    const BrotliEncoderPreparedDictionary* dictionary) {
+  /* First field of dictionary structs */
+  const BrotliEncoderPreparedDictionary* dict = dictionary;
+  uint32_t magic = *((const uint32_t*)dict);
+  SharedEncoderDictionary* current = NULL;
+  if (magic == kManagedDictionaryMagic) {
+    /* Unwrap managed dictionary. */
+    ManagedDictionary* managed_dictionary = (ManagedDictionary*)dict;
+    magic = *managed_dictionary->dictionary;
+    dict = (BrotliEncoderPreparedDictionary*)managed_dictionary->dictionary;
+  }
+  current = &state->params.dictionary;
+  if (magic == kPreparedDictionaryMagic ||
+      magic == kLeanPreparedDictionaryMagic) {
+    const PreparedDictionary* prepared = (const PreparedDictionary*)dict;
+    if (!AttachPreparedDictionary(&current->compound, prepared)) {
+      return BROTLI_FALSE;
+    }
+  } else if (magic == kSharedDictionaryMagic) {
+    const SharedEncoderDictionary* attached =
+        (const SharedEncoderDictionary*)dict;
+    BROTLI_BOOL was_default = !current->contextual.context_based &&
+        current->contextual.num_dictionaries == 1 &&
+        current->contextual.dict[0]->hash_table_words ==
+        kStaticDictionaryHashWords &&
+        current->contextual.dict[0]->hash_table_lengths ==
+        kStaticDictionaryHashLengths;
+    BROTLI_BOOL new_default = !attached->contextual.context_based &&
+        attached->contextual.num_dictionaries == 1 &&
+        attached->contextual.dict[0]->hash_table_words ==
+        kStaticDictionaryHashWords &&
+        attached->contextual.dict[0]->hash_table_lengths ==
+        kStaticDictionaryHashLengths;
+    size_t i;
+    if (state->is_initialized_) return BROTLI_FALSE;
+    current->max_quality =
+        BROTLI_MIN(int, current->max_quality, attached->max_quality);
+    for (i = 0; i < attached->compound.num_chunks; i++) {
+      if (!AttachPreparedDictionary(&current->compound,
+          attached->compound.chunks[i])) {
+        return BROTLI_FALSE;
+      }
+    }
+    if (!new_default) {
+      if (!was_default) return BROTLI_FALSE;
+      /* Copy by value, but then set num_instances_ to 0 because their memory
+      is managed by attached, not by current */
+      current->contextual = attached->contextual;
+      current->contextual.num_instances_ = 0;
+    }
+  } else {
+    return BROTLI_FALSE;
+  }
+  return BROTLI_TRUE;
+}
+
+size_t BrotliEncoderEstimatePeakMemoryUsage(int quality, int lgwin,
+                                            size_t input_size) {
+  BrotliEncoderParams params;
+  size_t memory_manager_slots = BROTLI_ENCODER_MEMORY_MANAGER_SLOTS;
+  size_t memory_manager_size = memory_manager_slots * sizeof(void*);
+  BrotliEncoderInitParams(&params);
+  params.quality = quality;
+  params.lgwin = lgwin;
+  params.size_hint = input_size;
+  params.large_window = lgwin > BROTLI_MAX_WINDOW_BITS;
+  SanitizeParams(&params);
+  params.lgblock = ComputeLgBlock(&params);
+  ChooseHasher(&params, &params.hasher);
+  if (params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY ||
+      params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
+    size_t state_size = sizeof(BrotliEncoderState);
+    size_t block_size = BROTLI_MIN(size_t, input_size, ((size_t)1ul << params.lgwin));
+    size_t hash_table_size =
+        HashTableSize(MaxHashTableSize(params.quality), block_size);
+    size_t hash_size =
+        (hash_table_size < (1u << 10)) ? 0 : sizeof(int) * hash_table_size;
+    size_t cmdbuf_size = params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY ?
+        5 * BROTLI_MIN(size_t, block_size, 1ul << 17) : 0;
+    if (params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) {
+      state_size += sizeof(BrotliOnePassArena);
+    } else {
+      state_size += sizeof(BrotliTwoPassArena);
+    }
+    return hash_size + cmdbuf_size + state_size;
+  } else {
+    size_t short_ringbuffer_size = (size_t)1 << params.lgblock;
+    int ringbuffer_bits = ComputeRbBits(&params);
+    size_t ringbuffer_size = input_size < short_ringbuffer_size ?
+        input_size : ((size_t)1u << ringbuffer_bits) + short_ringbuffer_size;
+    size_t hash_size[4] = {0};
+    size_t metablock_size =
+        BROTLI_MIN(size_t, input_size, MaxMetablockSize(&params));
+    size_t inputblock_size =
+        BROTLI_MIN(size_t, input_size, (size_t)1 << params.lgblock);
+    size_t cmdbuf_size = metablock_size * 2 + inputblock_size * 6;
+    size_t outbuf_size = metablock_size * 2 + 503;
+    size_t histogram_size = 0;
+    HasherSize(&params, BROTLI_TRUE, input_size, hash_size);
+    if (params.quality < MIN_QUALITY_FOR_BLOCK_SPLIT) {
+      cmdbuf_size = BROTLI_MIN(size_t, cmdbuf_size,
+          MAX_NUM_DELAYED_SYMBOLS * sizeof(Command) + inputblock_size * 12);
+    }
+    if (params.quality >= MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING) {
+      /* Only a very rough estimation, based on enwik8. */
+      histogram_size = 200 << 20;
+    } else if (params.quality >= MIN_QUALITY_FOR_BLOCK_SPLIT) {
+      size_t literal_histograms =
+          BROTLI_MIN(size_t, metablock_size / 6144, 256);
+      size_t command_histograms =
+          BROTLI_MIN(size_t, metablock_size / 6144, 256);
+      size_t distance_histograms =
+          BROTLI_MIN(size_t, metablock_size / 6144, 256);
+      histogram_size = literal_histograms * sizeof(HistogramLiteral) +
+                       command_histograms * sizeof(HistogramCommand) +
+                       distance_histograms * sizeof(HistogramDistance);
+    }
+    return (memory_manager_size + ringbuffer_size +
+            hash_size[0] + hash_size[1] + hash_size[2] + hash_size[3] +
+            cmdbuf_size +
+            outbuf_size +
+            histogram_size);
+  }
+}
+size_t BrotliEncoderGetPreparedDictionarySize(
+    const BrotliEncoderPreparedDictionary* prepared_dictionary) {
+  /* First field of dictionary structs */
+  const BrotliEncoderPreparedDictionary* prepared = prepared_dictionary;
+  uint32_t magic = *((const uint32_t*)prepared);
+  size_t overhead = 0;
+  if (magic == kManagedDictionaryMagic) {
+    const ManagedDictionary* managed = (const ManagedDictionary*)prepared;
+    overhead = sizeof(ManagedDictionary);
+    magic = *managed->dictionary;
+    prepared = (const BrotliEncoderPreparedDictionary*)managed->dictionary;
+  }
+
+  if (magic == kPreparedDictionaryMagic) {
+    const PreparedDictionary* dictionary =
+        (const PreparedDictionary*)prepared;
+    /* Keep in sync with step 3 of CreatePreparedDictionary */
+    return sizeof(PreparedDictionary) + dictionary->source_size +
+        (sizeof(uint32_t) << dictionary->slot_bits) +
+        (sizeof(uint16_t) << dictionary->bucket_bits) +
+        (sizeof(uint32_t) * dictionary->num_items) + overhead;
+  } else if (magic == kLeanPreparedDictionaryMagic) {
+    const PreparedDictionary* dictionary =
+        (const PreparedDictionary*)prepared;
+    /* Keep in sync with step 3 of CreatePreparedDictionary */
+    return sizeof(PreparedDictionary) + sizeof(uint8_t*) +
+        (sizeof(uint32_t) << dictionary->slot_bits) +
+        (sizeof(uint16_t) << dictionary->bucket_bits) +
+        (sizeof(uint32_t) * dictionary->num_items) + overhead;
+  } else if (magic == kSharedDictionaryMagic) {
+    const SharedEncoderDictionary* dictionary =
+        (const SharedEncoderDictionary*)prepared;
+    const CompoundDictionary* compound = &dictionary->compound;
+    const ContextualEncoderDictionary* contextual = &dictionary->contextual;
+    size_t result = sizeof(*dictionary);
+    size_t i;
+    size_t num_instances;
+    const BrotliEncoderDictionary* instances;
+    for (i = 0; i < compound->num_prepared_instances_; i++) {
+      size_t size = BrotliEncoderGetPreparedDictionarySize(
+          (const BrotliEncoderPreparedDictionary*)
+          compound->prepared_instances_[i]);
+      if (!size) return 0;  /* error */
+      result += size;
+    }
+    if (contextual->context_based) {
+      num_instances = contextual->num_instances_;
+      instances = contextual->instances_;
+      result += sizeof(*instances) * num_instances;
+    } else {
+      num_instances = 1;
+      instances = &contextual->instance_;
+    }
+    for (i = 0; i < num_instances; i++) {
+      const BrotliEncoderDictionary* dict = &instances[i];
+      result += dict->trie.pool_capacity * sizeof(BrotliTrieNode);
+      if (dict->hash_table_data_words_) {
+        result += sizeof(kStaticDictionaryHashWords);
+      }
+      if (dict->hash_table_data_lengths_) {
+        result += sizeof(kStaticDictionaryHashLengths);
+      }
+      if (dict->buckets_data_) {
+        result += sizeof(*dict->buckets_data_) * dict->buckets_alloc_size_;
+      }
+      if (dict->dict_words_data_) {
+        result += sizeof(*dict->dict_words) * dict->dict_words_alloc_size_;
+      }
+      if (dict->words_instance_) {
+        result += sizeof(*dict->words_instance_);
+        /* data_size not added here: it is never allocated by the
+           SharedEncoderDictionary, instead it always points to the file
+           already loaded in memory. So if the caller wants to include
+           this memory as well, add the size of the loaded dictionary
+           file to this. */
+      }
+    }
+    return result + overhead;
+  }
+  return 0;  /* error */
+}
+
+#if defined(BROTLI_TEST)
+size_t MakeUncompressedStreamForTest(const uint8_t*, size_t, uint8_t*);
+size_t MakeUncompressedStreamForTest(
+    const uint8_t* input, size_t input_size, uint8_t* output) {
+  return MakeUncompressedStream(input, input_size, output);
+}
+#endif
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif