1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/*
* 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.
*/
#include "Conversion.hpp"
#include "Dict.hpp"
using namespace opencc;
std::string Conversion::Convert(const char* phrase) const {
std::ostringstream buffer;
// Calculate string end to prevent reading beyond null terminator
const char* phraseEnd = phrase;
while (*phraseEnd != '\0') {
phraseEnd++;
}
for (const char* pstr = phrase; *pstr != '\0';) {
size_t remainingLength = phraseEnd - pstr;
Optional<const DictEntry*> matched = dict->MatchPrefix(pstr, remainingLength);
size_t matchedLength;
if (matched.IsNull()) {
matchedLength = UTF8Util::NextCharLength(pstr);
// Ensure we don't read beyond the null terminator
if (matchedLength > remainingLength) {
matchedLength = remainingLength;
}
buffer << UTF8Util::FromSubstr(pstr, matchedLength);
} else {
matchedLength = matched.Get()->KeyLength();
// Defensive: ensure dictionary key length does not exceed remaining input
// (MatchPrefix should already guarantee this, but defense in depth)
if (matchedLength > remainingLength) {
matchedLength = remainingLength;
}
buffer << matched.Get()->GetDefault();
}
pstr += matchedLength;
}
return buffer.str();
}
std::string Conversion::Convert(const std::string& phrase) const {
return Convert(phrase.c_str());
}
SegmentsPtr Conversion::Convert(const SegmentsPtr& input) const {
SegmentsPtr output(new Segments);
for (const char* segment : *input) {
output->AddSegment(Convert(segment));
}
return output;
}