Converting MBCS to UTF-8

chlorophyll5 (1)
I'm working on a project in VS2008 that compiles in MBCS but I need to work with some UTF8 string in order to communicate with some web services. I've worked out how to do it if I were to compile the project in Unicode, but converting the entire project would be a massive undertaking. Is there any way I can convert either MBCS to UTF8 or MBCS to Unicode? Either one would work for me.

Thanks!
Last edited on
helios (17607)
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#include <cwchar>
#define BOM8A 0xEF
#define BOM8B 0xBB
#define BOM8C 0xBF

//Support function. Do NOT call directly.
//Note: Assumes WCHAR_MAX>=0xFFFF
void UTF8_WC(wchar_t *dst,const uchar *src,ulong srcl){
	for (ulong a=0;a<srcl;a++){
		uchar byte=*src++;
		wchar_t c;
		if (!(byte&128))
			c=byte;
		else if ((byte&192)==128)
			continue;
		else if ((byte&224)==192){
			c=byte&31;
			c<<=6;
			c|=*src&63;
		}else if ((byte&240)==224){
			c=byte&15;
			c<<=6;
			c|=*src&63;
			c<<=6;
			c|=src[1]&63;
		}else if ((byte&248)==240){
#if WCHAR_MAX==0xFFFF
			c='?';
#else
			c=byte&7;
			c<<=6;
			c|=src[1]&63;
			c<<=6;
			c|=*src[2]&63;
			c<<=6;
			c|=*src[3]&63;
#endif
		}
		*dst++=c;
	}
}

//Call this one.
std::wstring UniFromUTF8(const std::string &str){
	ulong start=0;
	if (str.size()>=3 && (uchar)str[0]==BOM8A && (uchar)str[1]==BOM8B && (uchar)str[2]==BOM8C)
		start+=3;
	const uchar *str2=(const uchar *)&str[0]+start;
	ulong size=0;
	for (ulong a=0,end=str.size();a<end;a++,str2++)
		if (*str2<128 || (*str2&192)==192)
			size++;
	std::wstring res;
	res.resize(size);
	str2=(const uchar *)&str[0]+start;
	UTF8_WC(&res[0],str2,str.size()-start);
	return res;
}

Enjoy.
Last edited on
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