Function asStringEncodeUTF16

sdk/angelscript/source/as_string_util.cpp:347–380

The function will encode the unicode code point into the outEncodedBuffer, and then return the length of the encoded value. If the input value is not a valid unicode code point, then the function will return -1. This function is taken from the AngelCode ToolBox.

// This function is taken from the AngelCode ToolBox.
//
int asStringEncodeUTF16(unsigned int value, char *outEncodedBuffer)
{
	if( value < 0x10000 )
	{
#ifndef AS_BIG_ENDIAN
		outEncodedBuffer[0] = (value & 0xFF);
		outEncodedBuffer[1] = ((value >> 8) & 0xFF);
#else
		outEncodedBuffer[1] = (value & 0xFF);
		outEncodedBuffer[0] = ((value >> 8) & 0xFF);
#endif
		return 2;
	}
	else
	{
		value -= 0x10000;
		int surrogate1 = ((value >> 10) & 0x3FF) + 0xD800;
		int surrogate2 = (value & 0x3FF) + 0xDC00;

#ifndef AS_BIG_ENDIAN
		outEncodedBuffer[0] = (surrogate1 & 0xFF);
		outEncodedBuffer[1] = ((surrogate1 >> 8) & 0xFF);
		outEncodedBuffer[2] = (surrogate2 & 0xFF);
		outEncodedBuffer[3] = ((surrogate2 >> 8) & 0xFF);
#else
		outEncodedBuffer[1] = (surrogate1 & 0xFF);
		outEncodedBuffer[0] = ((surrogate1 >> 8) & 0xFF);
		outEncodedBuffer[3] = (surrogate2 & 0xFF);
		outEncodedBuffer[2] = ((surrogate2 >> 8) & 0xFF);
#endif

		return 4;
	}
}


END_AS_NAMESPACE