// Copyright 2015 Google Inc. All Rights Reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // // 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 #include "./command.h" #include "./histogram.h" namespace brotli { struct BlockSplit { BlockSplit() : num_types(0) {} int num_types; std::vector types; std::vector lengths; }; struct MetaBlockSplit { BlockSplit literal_split; BlockSplit command_split; BlockSplit distance_split; std::vector literal_context_map; std::vector distance_context_map; std::vector literal_histograms; std::vector command_histograms; std::vector distance_histograms; }; 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, int literal_context_mode, bool enable_context_modleing, MetaBlockSplit* mb); void BuildMetaBlockGreedy(const uint8_t* ringbuffer, size_t pos, size_t mask, const Command *commands, size_t n_commands, MetaBlockSplit* mb); void OptimizeHistograms(int num_direct_distance_codes, int distance_postfix_bits, MetaBlockSplit* mb); } // namespace brotli #endif // BROTLI_ENC_METABLOCK_H_