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65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_TOOLS_HUFFMAN_TRIE_TRIE_TRIE_WRITER_H_
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#define NET_TOOLS_HUFFMAN_TRIE_TRIE_TRIE_WRITER_H_
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#include <string>
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#include <vector>
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#include "net/tools/huffman_trie/bit_writer.h"
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#include "net/tools/huffman_trie/huffman/huffman_builder.h"
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#include "net/tools/huffman_trie/trie_entry.h"
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namespace net {
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namespace huffman_trie {
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enum : uint8_t { kTerminalValue = 0, kEndOfTableValue = 127 };
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class TrieWriter {
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public:
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TrieWriter(const HuffmanRepresentationTable& huffman_table,
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HuffmanBuilder* huffman_builder);
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~TrieWriter();
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// Constructs a trie containing all |entries|. The output is written to
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// |buffer_| and |*position| is set to the position of the trie root. Returns
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// true on success and false on failure.
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bool WriteEntries(const TrieEntries& entries, uint32_t* position);
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// Returns the position |buffer_| is currently at. The returned value
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// represents the number of bits.
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uint32_t position() const;
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// Flushes |buffer_|.
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void Flush();
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// Returns the trie bytes. Call Flush() first to ensure the buffer is
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// complete.
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const std::vector<uint8_t>& bytes() const { return buffer_.bytes(); }
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protected:
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const HuffmanRepresentationTable& huffman_table() const {
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return huffman_table_;
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}
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HuffmanBuilder* huffman_builder() { return huffman_builder_; }
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private:
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bool WriteDispatchTables(ReversedEntries::iterator start,
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ReversedEntries::iterator end,
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uint32_t* position);
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BitWriter buffer_;
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const HuffmanRepresentationTable& huffman_table_;
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HuffmanBuilder* huffman_builder_;
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};
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} // namespace huffman_trie
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} // namespace net
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#endif // NET_TOOLS_HUFFMAN_TRIE_TRIE_TRIE_WRITER_H_
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