| // Copyright 2013 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. |
| // |
| // API for Brotli compression |
| |
| #ifndef BROTLI_ENC_ENCODE_H_ |
| #define BROTLI_ENC_ENCODE_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <string> |
| #include <vector> |
| #include "./hash.h" |
| #include "./ringbuffer.h" |
| #include "./static_dict.h" |
| |
| namespace brotli { |
| |
| struct BrotliParams { |
| BrotliParams() |
| : mode(MODE_TEXT), |
| enable_transforms(false), |
| greedy_block_split(false) {} |
| |
| enum Mode { |
| MODE_TEXT = 0, |
| MODE_FONT = 1, |
| }; |
| Mode mode; |
| |
| bool enable_transforms; |
| bool greedy_block_split; |
| }; |
| |
| class BrotliCompressor { |
| public: |
| explicit BrotliCompressor(BrotliParams params); |
| ~BrotliCompressor(); |
| |
| // Writes the stream header into the internal output buffer. |
| void WriteStreamHeader(); |
| |
| // Encodes the data in input_buffer as a meta-block and writes it to |
| // encoded_buffer (*encoded_size should be set to the size of |
| // encoded_buffer) and sets *encoded_size to the number of bytes that |
| // was written. Returns 0 if there was an error and 1 otherwise. |
| bool WriteMetaBlock(const size_t input_size, |
| const uint8_t* input_buffer, |
| const bool is_last, |
| size_t* encoded_size, |
| uint8_t* encoded_buffer); |
| |
| // Writes a zero-length meta-block with end-of-input bit set to the |
| // internal output buffer and copies the output buffer to encoded_buffer |
| // (*encoded_size should be set to the size of encoded_buffer) and sets |
| // *encoded_size to the number of bytes written. Returns false if there was |
| // an error and true otherwise. |
| bool FinishStream(size_t* encoded_size, uint8_t* encoded_buffer); |
| |
| private: |
| // Initializes the hasher with the hashes of dictionary words. |
| void StoreDictionaryWordHashes(bool enable_transforms); |
| |
| BrotliParams params_; |
| int window_bits_; |
| std::unique_ptr<Hashers> hashers_; |
| int hash_type_; |
| size_t input_pos_; |
| RingBuffer ringbuffer_; |
| std::vector<float> literal_cost_; |
| int dist_cache_[4]; |
| int storage_ix_; |
| uint8_t* storage_; |
| static StaticDictionary *static_dictionary_; |
| }; |
| |
| // Compresses the data in input_buffer into encoded_buffer, and sets |
| // *encoded_size to the compressed length. |
| // Returns 0 if there was an error and 1 otherwise. |
| int BrotliCompressBuffer(BrotliParams params, |
| size_t input_size, |
| const uint8_t* input_buffer, |
| size_t* encoded_size, |
| uint8_t* encoded_buffer); |
| |
| } // namespace brotli |
| |
| #endif // BROTLI_ENC_ENCODE_H_ |