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BinaryDict.hpp
/*
* Open Chinese Convert
*
* Copyright 2010-2014 Carbo Kuo <byvoid@byvoid.com>
*
* 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.
*/
#pragma once
#include <cstdint>
#include <cstring>
#include "Common.hpp"
#include "SerializableDict.hpp"
namespace opencc {
// Returns true if the 8 bytes at `bytes` look like an 8-byte integer field
// from the legacy 64-bit OCD layout rather than two fixed-width uint32_t
// fields. Legacy files were written with native size_t fields in native byte
// order, so the probe is loaded as a native uint64_t: a legacy field has
// zero high 32 bits, while for a fixed-width file the high half is one of
// the two uint32 fields (or the start of the darts array), non-zero for any
// realistic dictionary. Works on both little- and big-endian hosts; legacy
// files themselves remain readable only on hosts of the byte order that
// wrote them.
inline bool LooksLikeLegacy64Field(const void* bytes) {
uint64_t word;
std::memcpy(&word, bytes, sizeof(word));
return (word >> 32) == 0;
}
class OPENCC_EXPORT BinaryDict : public SerializableDict {
public:
BinaryDict(const LexiconPtr& _lexicon) : lexicon(_lexicon) {}
virtual ~BinaryDict() {}
virtual void SerializeToFile(FILE* fp) const;
static BinaryDictPtr NewFromFile(FILE* fp);
static BinaryDictPtr NewFromBuffer(const char* data, size_t size);
const LexiconPtr& GetLexicon() const { return lexicon; }
size_t KeyMaxLength() const;
private:
LexiconPtr lexicon;
std::string keyBuffer;
std::string valueBuffer;
void ConstructBuffer(std::string& keyBuffer, std::vector<size_t>& keyOffset,
size_t& keyTotalLength, std::string& valueBuffer,
std::vector<size_t>& valueOffset,
size_t& valueTotalLength) const;
};
} // namespace opencc
opencc::BinaryDict::SerializeToFile
virtual void SerializeToFile(FILE *fp) const
Serializes the dictionary and writes in to a file.
Definition BinaryDict.cpp:87
opencc::SerializableDict
Serializable dictionary interface.
Definition SerializableDict.hpp:32