開發 - Computer/Interest
UTF-8 URL Decode to MFC CString
배트
2010. 10. 7. 17:24
Some source codes which conduct URL decoding are awful!!
Most of them cannot process a UTF-8 encoded 3 bytes character. (frankly, I'm not good at web search.)
One more frankly, I can't guarantee it works well. Sorry all. :-)
CString URLDecode( CString strEncodedText )
{
CString strResult;
wchar_t ch0, ch1, ch2;
wchar_t wch;
TCHAR tch;
int i = 0;
while( i<strEncodedText.GetLength() )
{
tch = strEncodedText.GetAt(i);
if( tch != _T('%') )
{
// a character not encoded
strResult += tch;
i++;
}
else
{
// a character encoded !!
ch0 = _tcstol( strEncodedText.Mid( i+1, 2 ), NULL, 16 );
i += 3;
if( ch0 < 0x80 )
// 1 byte for UTF-8
// 0xxx xxxx
wch = ch0;
else
{
if( strEncodedText.GetAt(i)!= _T('%') ) // Error!
continue;
ch1 = _tcstol( strEncodedText.Mid( i+1, 2 ), NULL, 16 );
i += 3;
if( ch0 < 0xe0 )
{
// 2 byte for UTF-8
// 110x xxxx 10xx xxxx
wch = ((ch0&0x1f)<<6)
| (ch1&0x3f);
}
else
{
// 3 byte for UTF-8
if( strEncodedText.GetAt(i)!= _T('%') ) // Error!
continue;
ch2 = _tcstol( strEncodedText.Mid( i+1, 2 ), NULL, 16 );
i += 3;
// 1110 xxxx 10xx xxxx 10xx xxxx
wch = ((ch0&0x0f)<<12)
| ((ch1&0x3f)<<6)
| (ch2&0x3f);
}
}
strResult += wch;
}
}
return strResult;
}