49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/* Copyright 2018 Dirk Steinke
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#ifndef HUFFMAN_ENCODER_H
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#define HUFFMAN_ENCODER_H
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#include <vector>
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#include "bitstream.h"
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// Huffman decoder
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class HuffmanEncoder {
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public:
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HuffmanEncoder(const unsigned char* symbolBitLengths,
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const unsigned symbolCount,
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const bool disableZeroBitSymbols);
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bool error() const {
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return _error;
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}
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void encode(BitOutputStream& bos, const unsigned symbol) const {
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unsigned v = _lookup[symbol];
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bos.put(v >> 5, v & 0x1f);
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}
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private:
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bool _constructTables(const unsigned char* symbolBitLengths,
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const unsigned symbolCount,
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const bool disableZeroBitSymbols);
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void _constructErrorTable(const unsigned symbolCount);
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private:
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std::vector<unsigned> _lookup;
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bool _error;
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};
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#endif /* HUFFMAN_ENCODER_H */
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