mirror of
https://github.com/google/brotli.git
synced 2024-11-22 19:50:06 +00:00
96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
// 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 {
|
|
enum Mode {
|
|
MODE_TEXT = 0,
|
|
MODE_FONT = 1,
|
|
};
|
|
Mode mode;
|
|
|
|
bool enable_transforms;
|
|
|
|
BrotliParams() : mode(MODE_TEXT), enable_transforms(false) {}
|
|
};
|
|
|
|
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_
|