Function stringToUTF8Array

src/piper.js:1329–1361

(str, heap, outIdx, maxBytesToWrite)

			return len;
		};
		var stringToUTF8Array = (str, heap, outIdx, maxBytesToWrite) => {
			if (!(maxBytesToWrite > 0)) return 0;
			var startIdx = outIdx;
			var endIdx = outIdx + maxBytesToWrite - 1;
			for (var i = 0; i < str.length; ++i) {
				var u = str.charCodeAt(i);
				if (u >= 55296 && u <= 57343) {
					var u1 = str.charCodeAt(++i);
					u = (65536 + ((u & 1023) << 10)) | (u1 & 1023);
				}
				if (u <= 127) {
					if (outIdx >= endIdx) break;
					heap[outIdx++] = u;
				} else if (u <= 2047) {
					if (outIdx + 1 >= endIdx) break;
					heap[outIdx++] = 192 | (u >> 6);
					heap[outIdx++] = 128 | (u & 63);
				} else if (u <= 65535) {
					if (outIdx + 2 >= endIdx) break;
					heap[outIdx++] = 224 | (u >> 12);
					heap[outIdx++] = 128 | ((u >> 6) & 63);
					heap[outIdx++] = 128 | (u & 63);
				} else {
					if (outIdx + 3 >= endIdx) break;
					heap[outIdx++] = 240 | (u >> 18);
					heap[outIdx++] = 128 | ((u >> 12) & 63);
					heap[outIdx++] = 128 | ((u >> 6) & 63);
					heap[outIdx++] = 128 | (u & 63);
				}
			}
			heap[outIdx] = 0;
			return outIdx - startIdx;
		};
		function intArrayFromString(stringy, dontAddNull, length) {
			var len = length > 0 ? length : lengthBytesUTF8(stringy) + 1;
			var u8array = new Array(len);