+
+QString decodeString(const QByteArray &input, QTextCodec *codec)
+{
+ if (codec && utf8DetectionBlacklist.contains(codec->mibEnum()))
+ return codec->toUnicode(input);
+
+ // First, we check if it's utf8. It is very improbable to encounter a string that looks like
+ // valid utf8, but in fact is not. This means that if the input string passes as valid utf8, it
+ // is safe to assume that it is.
+ // Q_ASSERT(sizeof(const char) == sizeof(quint8)); // In God we trust...
+ bool isUtf8 = true;
+ int cnt = 0;
+ for (int i = 0; i < input.size(); i++) {
+ if (cnt) {
+ // We check a part of a multibyte char. These need to be of the form 10yyyyyy.
+ if ((input[i] & 0xc0) != 0x80) { isUtf8 = false; break; }
+ cnt--;
+ continue;
+ }
+ if ((input[i] & 0x80) == 0x00) continue; // 7 bit is always ok
+ if ((input[i] & 0xf8) == 0xf0) { cnt = 3; continue; } // 4-byte char 11110xxx 10yyyyyy 10zzzzzz 10vvvvvv
+ if ((input[i] & 0xf0) == 0xe0) { cnt = 2; continue; } // 3-byte char 1110xxxx 10yyyyyy 10zzzzzz
+ if ((input[i] & 0xe0) == 0xc0) { cnt = 1; continue; } // 2-byte char 110xxxxx 10yyyyyy
+ isUtf8 = false; break; // 8 bit char, but not utf8!
+ }
+ if (isUtf8 && cnt == 0) {
+ QString s = QString::fromUtf8(input);
+ //qDebug() << "Detected utf8:" << s;
+ return s;
+ }
+ //QTextCodec *codec = QTextCodec::codecForName(encoding.toAscii());
+ if (!codec) return QString::fromAscii(input);
+ return codec->toUnicode(input);
+}
+
+
+uint editingDistance(const QString &s1, const QString &s2)
+{
+ uint n = s1.size()+1;
+ uint m = s2.size()+1;
+ QVector<QVector<uint> > matrix(n, QVector<uint>(m, 0));
+
+ for (uint i = 0; i < n; i++)
+ matrix[i][0] = i;
+
+ for (uint i = 0; i < m; i++)
+ matrix[0][i] = i;
+
+ uint min;
+ for (uint i = 1; i < n; i++) {
+ for (uint j = 1; j < m; j++) {
+ uint deleteChar = matrix[i-1][j] + 1;
+ uint insertChar = matrix[i][j-1] + 1;
+
+ if (deleteChar < insertChar)
+ min = deleteChar;
+ else
+ min = insertChar;
+
+ if (s1[i-1] == s2[j-1]) {
+ uint inheritChar = matrix[i-1][j-1];
+ if (inheritChar < min)
+ min = inheritChar;
+ }
+
+ matrix[i][j] = min;
+ }
+ }
+ return matrix[n-1][m-1];