Unicode string normalization in C/C++
Am wondering how to normalize strings (containing utf-8/utf-16) in C/C++. In .NET there is a function String.Normalize .
I used UTF8-CPP in the past but it does not provide such a function. ICU and Qt provide string normalization but I prefer lightweight solutions.
Is there any "lightweight" solution for this?
For Windows, there is the NormalizeString() function (unfortunately for Vista and later only - as far as I see on MSDN):
It's the simplest way to go that I have found so far. I guess it's quite lightweight too.
int NormalizeString( _In_ NORM_FORM NormForm, _In_ LPCWSTR lpSrcString, _In_ int cwSrcLength, _Out_opt_ LPWSTR lpDstString, _In_ int cwDstLength );
You could build ICU with minimal (or possibly, no other data- I think all of the normalization data is now internal), and then statically link. I haven't tried this recently, but I believe the total size is pretty small in that case.
"Lightweight" in your context means "with limited functionality". I would use ICU source as an example, and reference http://unicode.org/reports/tr15/ to implement this "lightweight" functionality.
A good UTF-8 solution is glib's g_utf8_normalize() function. Would require to convert std::wstring to std::string (utf16 to utf8) if you need this for wstring too (which would make it quite an expensive solution, hence I'm looking myself for a better solution, if possible with pure C++(11) means).