[fbreader] Optimized ZLUnicodeUtil::toLower and toUpper for ASCII
Performance analysis shows that UTF8->UCS4->UTF8 conversion takes noticeable amount of CPU time. For ASCII strings it's unnecessary.
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1 changed files with 26 additions and 12 deletions
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@ -450,13 +450,20 @@ void ZLUnicodeUtil::toLower(Ucs4String &str) {
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}
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std::string ZLUnicodeUtil::toLower(const std::string &utf8String) {
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Ucs4String ucs4String;
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utf8ToUcs4(ucs4String, utf8String);
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toLower(ucs4String);
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std::string result;
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ucs4ToUtf8(result, ucs4String, utf8String.length());
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const int utf8Len = utf8String.length();
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if (utf8Length(utf8String) == utf8Len) {
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// ASCII string
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result.reserve(utf8Len);
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for (std::string::const_iterator it = utf8String.begin(); it != utf8String.end(); ++it) {
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result.append(1, tolower(*it));
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}
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} else {
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Ucs4String ucs4String;
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utf8ToUcs4(ucs4String, utf8String);
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toLower(ucs4String);
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ucs4ToUtf8(result, ucs4String, utf8Len);
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}
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return result;
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}
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@ -473,12 +480,19 @@ void ZLUnicodeUtil::toUpper(Ucs4String &str) {
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}
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std::string ZLUnicodeUtil::toUpper(const std::string &utf8String) {
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Ucs4String ucs4String;
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utf8ToUcs4(ucs4String, utf8String);
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toUpper(ucs4String);
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std::string result;
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ucs4ToUtf8(result, ucs4String, utf8String.length());
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const int utf8Len = utf8String.length();
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if (utf8Length(utf8String) == utf8Len) {
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// ASCII string
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result.reserve(utf8Len);
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for (std::string::const_iterator it = utf8String.begin(); it != utf8String.end(); ++it) {
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result.append(1, toupper(*it));
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}
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} else {
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Ucs4String ucs4String;
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utf8ToUcs4(ucs4String, utf8String);
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toUpper(ucs4String);
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ucs4ToUtf8(result, ucs4String, utf8Len);
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}
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return result;
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}
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