File size: 6,969 Bytes
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* Open Chinese Convert
*
* Copyright 2010-2020 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.
*/
#include <algorithm>
#include <cassert>
#include <cstring>
#include "BinaryDict.hpp"
#include "Lexicon.hpp"
using namespace opencc;
size_t BinaryDict::KeyMaxLength() const {
size_t maxLength = 0;
for (const std::unique_ptr<DictEntry>& entry : *lexicon) {
maxLength = (std::max)(maxLength, entry->KeyLength());
}
return maxLength;
}
void BinaryDict::SerializeToFile(FILE* fp) const {
std::string keyBuf, valueBuf;
std::vector<size_t> keyOffsets, valueOffsets;
size_t keyTotalLength = 0, valueTotalLength = 0;
ConstructBuffer(keyBuf, keyOffsets, keyTotalLength, valueBuf, valueOffsets,
valueTotalLength);
// Number of items
size_t numItems = lexicon->Length();
fwrite(&numItems, sizeof(size_t), 1, fp);
// Data
fwrite(&keyTotalLength, sizeof(size_t), 1, fp);
fwrite(keyBuf.c_str(), sizeof(char), keyTotalLength, fp);
fwrite(&valueTotalLength, sizeof(size_t), 1, fp);
fwrite(valueBuf.c_str(), sizeof(char), valueTotalLength, fp);
size_t keyCursor = 0, valueCursor = 0;
for (const std::unique_ptr<DictEntry>& entry : *lexicon) {
// Number of values
size_t numValues = entry->NumValues();
fwrite(&numValues, sizeof(size_t), 1, fp);
// Key offset
size_t keyOffset = keyOffsets[keyCursor++];
fwrite(&keyOffset, sizeof(size_t), 1, fp);
// Values offset
for (size_t i = 0; i < numValues; i++) {
size_t valueOffset = valueOffsets[valueCursor++];
fwrite(&valueOffset, sizeof(size_t), 1, fp);
}
}
assert(keyCursor == numItems);
}
BinaryDictPtr BinaryDict::NewFromFile(FILE* fp) {
long savedOffset = ftell(fp);
fseek(fp, 0L, SEEK_END);
long offsetBoundLong = ftell(fp) - savedOffset;
fseek(fp, savedOffset, SEEK_SET);
assert(offsetBoundLong >= 0);
size_t offsetBound = static_cast<size_t>(offsetBoundLong);
BinaryDictPtr dict(new BinaryDict(LexiconPtr(new Lexicon)));
// Number of items
size_t numItems;
size_t unitsRead = fread(&numItems, sizeof(size_t), 1, fp);
if (unitsRead != 1) {
throw InvalidFormat("Invalid OpenCC binary dictionary (numItems)");
}
// Keys
size_t keyTotalLength;
unitsRead = fread(&keyTotalLength, sizeof(size_t), 1, fp);
if (unitsRead != 1) {
throw InvalidFormat("Invalid OpenCC binary dictionary (keyTotalLength)");
}
dict->keyBuffer.resize(keyTotalLength);
unitsRead = fread(const_cast<char*>(dict->keyBuffer.c_str()), sizeof(char),
keyTotalLength, fp);
if (unitsRead != keyTotalLength) {
throw InvalidFormat("Invalid OpenCC binary dictionary (keyBuffer)");
}
// Values
size_t valueTotalLength;
unitsRead = fread(&valueTotalLength, sizeof(size_t), 1, fp);
if (unitsRead != 1) {
throw InvalidFormat("Invalid OpenCC binary dictionary (valueTotalLength)");
}
dict->valueBuffer.resize(valueTotalLength);
unitsRead = fread(const_cast<char*>(dict->valueBuffer.c_str()), sizeof(char),
valueTotalLength, fp);
if (unitsRead != valueTotalLength) {
throw InvalidFormat("Invalid OpenCC binary dictionary (valueBuffer)");
}
// Offsets
for (size_t i = 0; i < numItems; i++) {
// Number of values
size_t numValues;
unitsRead = fread(&numValues, sizeof(size_t), 1, fp);
if (unitsRead != 1) {
throw InvalidFormat("Invalid OpenCC binary dictionary (numValues)");
}
// Key offset
size_t keyOffset;
unitsRead = fread(&keyOffset, sizeof(size_t), 1, fp);
if (unitsRead != 1 || keyOffset >= offsetBound) {
throw InvalidFormat("Invalid OpenCC binary dictionary (keyOffset)");
}
std::string key = dict->keyBuffer.c_str() + keyOffset;
// Value offset
std::vector<std::string> values;
for (size_t j = 0; j < numValues; j++) {
size_t valueOffset;
unitsRead = fread(&valueOffset, sizeof(size_t), 1, fp);
if (unitsRead != 1 || valueOffset >= offsetBound) {
throw InvalidFormat("Invalid OpenCC binary dictionary (valueOffset)");
}
const char* value = dict->valueBuffer.c_str() + valueOffset;
values.push_back(value);
}
DictEntry* entry = DictEntryFactory::New(key, values);
dict->lexicon->Add(entry);
}
return dict;
}
void BinaryDict::ConstructBuffer(std::string& keyBuf,
std::vector<size_t>& keyOffset,
size_t& keyTotalLength, std::string& valueBuf,
std::vector<size_t>& valueOffset,
size_t& valueTotalLength) const {
keyTotalLength = 0;
valueTotalLength = 0;
// Calculate total length
for (const std::unique_ptr<DictEntry>& entry : *lexicon) {
keyTotalLength += entry->KeyLength() + 1;
assert(entry->NumValues() != 0);
if (entry->NumValues() == 1) {
const auto* svEntry =
static_cast<const SingleValueDictEntry*>(entry.get());
valueTotalLength += svEntry->Value().length() + 1;
} else {
const auto* mvEntry =
static_cast<const MultiValueDictEntry*>(entry.get());
for (const auto& value : mvEntry->Values()) {
valueTotalLength += value.length() + 1;
}
}
}
// Write keys and values to buffers
keyBuf.resize(keyTotalLength, '\0');
valueBuf.resize(valueTotalLength, '\0');
char* pKeyBuffer = const_cast<char*>(keyBuf.c_str());
char* pValueBuffer = const_cast<char*>(valueBuf.c_str());
for (const std::unique_ptr<DictEntry>& entry : *lexicon) {
strcpy(pKeyBuffer, entry->Key().c_str());
keyOffset.push_back(pKeyBuffer - keyBuf.c_str());
pKeyBuffer += entry->KeyLength() + 1;
if (entry->NumValues() == 1) {
const auto* svEntry =
static_cast<const SingleValueDictEntry*>(entry.get());
strcpy(pValueBuffer, svEntry->Value().c_str());
valueOffset.push_back(pValueBuffer - valueBuf.c_str());
pValueBuffer += svEntry->Value().length() + 1;
} else {
const auto* mvEntry =
static_cast<const MultiValueDictEntry*>(entry.get());
for (const auto& value : mvEntry->Values()) {
strcpy(pValueBuffer, value.c_str());
valueOffset.push_back(pValueBuffer - valueBuf.c_str());
pValueBuffer += value.length() + 1;
}
}
}
assert(keyBuf.c_str() + keyTotalLength == pKeyBuffer);
assert(valueBuf.c_str() + valueTotalLength == pValueBuffer);
}
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