function stringToUTF8()

in content/lib/paho-mqtt.js [606:638]

• 29 lines of code
• 8 McCabe index (conditional complexity)

	function stringToUTF8(input, output, start) {
		var pos = start;
		for (var i = 0; i<input.length; i++) {
			var charCode = input.charCodeAt(i);

			// Check for a surrogate pair.
			if (0xD800 <= charCode && charCode <= 0xDBFF) {
				var lowCharCode = input.charCodeAt(++i);
				if (isNaN(lowCharCode)) {
					throw new Error(format(ERROR.MALFORMED_UNICODE, [charCode, lowCharCode]));
				}
				charCode = ((charCode - 0xD800)<<10) + (lowCharCode - 0xDC00) + 0x10000;

			}

			if (charCode <= 0x7F) {
				output[pos++] = charCode;
			} else if (charCode <= 0x7FF) {
				output[pos++] = charCode>>6  & 0x1F | 0xC0;
				output[pos++] = charCode     & 0x3F | 0x80;
			} else if (charCode <= 0xFFFF) {
				output[pos++] = charCode>>12 & 0x0F | 0xE0;
				output[pos++] = charCode>>6  & 0x3F | 0x80;
				output[pos++] = charCode     & 0x3F | 0x80;
			} else {
				output[pos++] = charCode>>18 & 0x07 | 0xF0;
				output[pos++] = charCode>>12 & 0x3F | 0x80;
				output[pos++] = charCode>>6  & 0x3F | 0x80;
				output[pos++] = charCode     & 0x3F | 0x80;
			}
		}
		return output;
	}