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| 1 | +#pragma once |
| 2 | + |
| 3 | +#include <string> |
| 4 | +#include <unicode/ucsdet.h> |
| 5 | +#include <unicode/ucnv.h> |
| 6 | + |
| 7 | +std::string convertToSjis(std::string src) { |
| 8 | + auto error = U_ZERO_ERROR; |
| 9 | + auto detector = ucsdet_open(&error); |
| 10 | + |
| 11 | + if (U_FAILURE(error)) { |
| 12 | + return src; |
| 13 | + } |
| 14 | + |
| 15 | + ucsdet_setText(detector, src.c_str(), src.size(), &error); |
| 16 | + |
| 17 | + if (U_FAILURE(error)) { |
| 18 | + ucsdet_close(detector); |
| 19 | + return src; |
| 20 | + } |
| 21 | + |
| 22 | + auto match = ucsdet_detect(detector, &error); |
| 23 | + |
| 24 | + if (U_FAILURE(error)) { |
| 25 | + ucsdet_close(detector); |
| 26 | + return src; |
| 27 | + } |
| 28 | + |
| 29 | + auto name = ucsdet_getName(match, &error); |
| 30 | + |
| 31 | + if (U_FAILURE(error)) { |
| 32 | + ucsdet_close(detector); |
| 33 | + return src; |
| 34 | + } |
| 35 | + |
| 36 | + ucsdet_close(detector); |
| 37 | + |
| 38 | + // 誤検知による文字化けを防ぐため、SJISとUTF8のみ対応 |
| 39 | + if (strcmp(name, "UTF-8") != 0) { |
| 40 | + return src; |
| 41 | + } |
| 42 | + auto toConverter = ucnv_open("MS932", &error); |
| 43 | + |
| 44 | + if (U_FAILURE(error)) { |
| 45 | + return src; |
| 46 | + } |
| 47 | + |
| 48 | + auto fromConverter = ucnv_open(name, &error); |
| 49 | + |
| 50 | + if (U_FAILURE(error)) { |
| 51 | + ucnv_close(toConverter); |
| 52 | + return src; |
| 53 | + } |
| 54 | + |
| 55 | + // 大きいが十分 |
| 56 | + auto internalMaxLen = ucnv_getMaxCharSize(fromConverter) * src.size(); |
| 57 | + auto internalBuffer = (UChar*)malloc(sizeof(UChar) * internalMaxLen); |
| 58 | + |
| 59 | + if (internalBuffer == nullptr) { |
| 60 | + ucnv_close(toConverter); |
| 61 | + ucnv_close(fromConverter); |
| 62 | + return src; |
| 63 | + } |
| 64 | + |
| 65 | + auto len = ucnv_toUChars( |
| 66 | + fromConverter, |
| 67 | + internalBuffer, |
| 68 | + internalMaxLen, |
| 69 | + src.c_str(), |
| 70 | + src.size(), |
| 71 | + &error |
| 72 | + ); |
| 73 | + |
| 74 | + if (U_FAILURE(error)) { |
| 75 | + free(internalBuffer); |
| 76 | + ucnv_close(toConverter); |
| 77 | + ucnv_close(fromConverter); |
| 78 | + return src; |
| 79 | + } |
| 80 | + |
| 81 | + auto resultMaxLen = ucnv_getMaxCharSize(toConverter) * len; |
| 82 | + auto resultBuffer = (char*)malloc(sizeof(char) * resultMaxLen); |
| 83 | + |
| 84 | + if (resultBuffer == nullptr) { |
| 85 | + free(internalBuffer); |
| 86 | + ucnv_close(toConverter); |
| 87 | + ucnv_close(fromConverter); |
| 88 | + return src; |
| 89 | + } |
| 90 | + |
| 91 | + auto result = ucnv_fromUChars( |
| 92 | + toConverter, |
| 93 | + resultBuffer, |
| 94 | + resultMaxLen, |
| 95 | + internalBuffer, |
| 96 | + len, |
| 97 | + &error |
| 98 | + ); |
| 99 | + |
| 100 | + if (U_FAILURE(error)) { |
| 101 | + free(internalBuffer); |
| 102 | + ucnv_close(toConverter); |
| 103 | + ucnv_close(fromConverter); |
| 104 | + return src; |
| 105 | + } |
| 106 | + |
| 107 | + auto dest = std::string(resultBuffer); |
| 108 | + |
| 109 | + free(internalBuffer); |
| 110 | + ucnv_close(toConverter); |
| 111 | + ucnv_close(fromConverter); |
| 112 | + |
| 113 | + return dest; |
| 114 | +} |
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