Update brotli to v1.0.0-snapshot.

third_party/brotli/enc/metablock.h

 /* 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.
+/* Algorithms for distributing the literals and commands of a metablock between
+   block types and contexts. */
 
 #ifndef BROTLI_ENC_METABLOCK_H_
 #define BROTLI_ENC_METABLOCK_H_
 
-#include <vector>
+#include <brotli/types.h>
+#include "./block_splitter.h"
+#include "./command.h"
+#include "./context.h"
+#include "./histogram.h"
+#include "./memory.h"
+#include "./port.h"
+#include "./quality.h"
 
-#include "./command.h"
-#include "./histogram.h"
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
 
-namespace brotli {
-
-struct BlockSplit {
-  BlockSplit(void) : num_types(0) {}
-
-  size_t num_types;
-  std::vector<uint8_t> types;
-  std::vector<uint32_t> lengths;
-};
-
-struct MetaBlockSplit {
+typedef struct MetaBlockSplit {
   BlockSplit literal_split;
   BlockSplit command_split;
   BlockSplit distance_split;
-  std::vector<uint32_t> literal_context_map;
-  std::vector<uint32_t> distance_context_map;
-  std::vector<HistogramLiteral> literal_histograms;
-  std::vector<HistogramCommand> command_histograms;
-  std::vector<HistogramDistance> distance_histograms;
-};
+  uint32_t* literal_context_map;
+  size_t literal_context_map_size;
+  uint32_t* distance_context_map;
+  size_t distance_context_map_size;
+  HistogramLiteral* literal_histograms;
+  size_t literal_histograms_size;
+  HistogramCommand* command_histograms;
+  size_t command_histograms_size;
+  HistogramDistance* distance_histograms;
+  size_t distance_histograms_size;
+} MetaBlockSplit;
 
-// Uses the slow shortest-path block splitter and does context clustering.
-void BuildMetaBlock(const uint8_t* ringbuffer,
-                    const size_t pos,
-                    const size_t mask,
-                    uint8_t prev_byte,
-                    uint8_t prev_byte2,
-                    const Command* cmds,
-                    size_t num_commands,
-                    ContextType literal_context_mode,
-                    MetaBlockSplit* mb);
+static BROTLI_INLINE void InitMetaBlockSplit(MetaBlockSplit* mb) {
+  BrotliInitBlockSplit(&mb->literal_split);
+  BrotliInitBlockSplit(&mb->command_split);
+  BrotliInitBlockSplit(&mb->distance_split);
+  mb->literal_context_map = 0;
+  mb->literal_context_map_size = 0;
+  mb->distance_context_map = 0;
+  mb->distance_context_map_size = 0;
+  mb->literal_histograms = 0;
+  mb->literal_histograms_size = 0;
+  mb->command_histograms = 0;
+  mb->command_histograms_size = 0;
+  mb->distance_histograms = 0;
+  mb->distance_histograms_size = 0;
+}
 
-// Uses a fast greedy block splitter that tries to merge current block with the
-// last or the second last block and does not do any context modeling.
-void BuildMetaBlockGreedy(const uint8_t* ringbuffer,
-                          size_t pos,
-                          size_t mask,
-                          const Command *commands,
-                          size_t n_commands,
-                          MetaBlockSplit* mb);
+static BROTLI_INLINE void DestroyMetaBlockSplit(
+    MemoryManager* m, MetaBlockSplit* mb) {
+  BrotliDestroyBlockSplit(m, &mb->literal_split);
+  BrotliDestroyBlockSplit(m, &mb->command_split);
+  BrotliDestroyBlockSplit(m, &mb->distance_split);
+  BROTLI_FREE(m, mb->literal_context_map);
+  BROTLI_FREE(m, mb->distance_context_map);
+  BROTLI_FREE(m, mb->literal_histograms);
+  BROTLI_FREE(m, mb->command_histograms);
+  BROTLI_FREE(m, mb->distance_histograms);
+}
 
-// Uses a fast greedy block splitter that tries to merge current block with the
-// last or the second last block and uses a static context clustering which
-// is the same for all block types.
-void BuildMetaBlockGreedyWithContexts(const uint8_t* ringbuffer,
-                                      size_t pos,
-                                      size_t mask,
-                                      uint8_t prev_byte,
-                                      uint8_t prev_byte2,
-                                      ContextType literal_context_mode,
-                                      size_t num_contexts,
-                                      const uint32_t* static_context_map,
-                                      const Command *commands,
-                                      size_t n_commands,
-                                      MetaBlockSplit* mb);
+/* Uses the slow shortest-path block splitter and does context clustering. */
+BROTLI_INTERNAL void BrotliBuildMetaBlock(MemoryManager* m,
+                                          const uint8_t* ringbuffer,
+                                          const size_t pos,
+                                          const size_t mask,
+                                          const BrotliEncoderParams* params,
+                                          uint8_t prev_byte,
+                                          uint8_t prev_byte2,
+                                          const Command* cmds,
+                                          size_t num_commands,
+                                          ContextType literal_context_mode,
+                                          MetaBlockSplit* mb);
 
-void OptimizeHistograms(size_t num_direct_distance_codes,
-                        size_t distance_postfix_bits,
-                        MetaBlockSplit* mb);
+/* Uses a fast greedy block splitter that tries to merge current block with the
+   last or the second last block and does not do any context modeling. */
+BROTLI_INTERNAL void BrotliBuildMetaBlockGreedy(MemoryManager* m,
+                                                const uint8_t* ringbuffer,
+                                                size_t pos,
+                                                size_t mask,
+                                                const Command* commands,
+                                                size_t n_commands,
+                                                MetaBlockSplit* mb);
 
-}  // namespace brotli
+/* Uses a fast greedy block splitter that tries to merge current block with the
+   last or the second last block and uses a static context clustering which
+   is the same for all block types. */
+BROTLI_INTERNAL void BrotliBuildMetaBlockGreedyWithContexts(
+    MemoryManager* m, const uint8_t* ringbuffer, size_t pos, size_t mask,
+    uint8_t prev_byte, uint8_t prev_byte2, ContextType literal_context_mode,
+    size_t num_contexts, const uint32_t* static_context_map,
+    const Command* commands, size_t n_commands, MetaBlockSplit* mb);
 
-#endif  // BROTLI_ENC_METABLOCK_H_
+BROTLI_INTERNAL void BrotliOptimizeHistograms(size_t num_direct_distance_codes,
+                                              size_t distance_postfix_bits,
+                                              MetaBlockSplit* mb);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif
+
+#endif  /* BROTLI_ENC_METABLOCK_H_ */