mirror of
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c66e4e3e4f
This commit is for the encoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Block split point selection utilities.
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#ifndef BROTLI_ENC_BLOCK_SPLITTER_H_
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#define BROTLI_ENC_BLOCK_SPLITTER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <vector>
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#include <utility>
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#include "./command.h"
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namespace brotli {
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struct BlockSplit {
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int num_types_;
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std::vector<uint8_t> types_;
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std::vector<uint8_t> type_codes_;
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std::vector<int> lengths_;
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};
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struct BlockSplitIterator {
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explicit BlockSplitIterator(const BlockSplit& split)
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: split_(split), idx_(0), type_(0), length_(0) {
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if (!split.lengths_.empty()) {
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length_ = split.lengths_[0];
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}
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}
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void Next() {
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if (length_ == 0) {
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++idx_;
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type_ = split_.types_[idx_];
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length_ = split_.lengths_[idx_];
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}
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--length_;
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}
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const BlockSplit& split_;
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int idx_;
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int type_;
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int length_;
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};
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void CopyLiteralsToByteArray(const std::vector<Command>& cmds,
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const uint8_t* data,
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std::vector<uint8_t>* literals);
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void SplitBlock(const std::vector<Command>& cmds,
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const uint8_t* data,
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BlockSplit* literal_split,
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BlockSplit* insert_and_copy_split,
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BlockSplit* dist_split);
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void SplitBlockByTotalLength(const std::vector<Command>& all_commands,
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int input_size,
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int target_length,
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std::vector<std::vector<Command> >* blocks);
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} // namespace brotli
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#endif // BROTLI_ENC_BLOCK_SPLITTER_H_
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