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node_modules/es5-ext/math/_pack-ieee754.js

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+/* eslint no-bitwise: "off" */
+// Credit: https://github.com/paulmillr/es6-shim/
+
+"use strict";
+
+var abs = Math.abs
+  , floor = Math.floor
+  , log = Math.log
+  , min = Math.min
+  , pow = Math.pow
+  , LN2 = Math.LN2
+  , roundToEven;
+
+roundToEven = function (num) {
+	var whole = floor(num), fraction = num - whole;
+	if (fraction < 0.5) return whole;
+	if (fraction > 0.5) return whole + 1;
+	return whole % 2 ? whole + 1 : whole;
+};
+
+// eslint-disable-next-line max-statements, max-lines-per-function
+module.exports = function (value, ebits, fbits) {
+	var bias = (1 << (ebits - 1)) - 1, sign, e, fraction, i, bits, str, bytes;
+
+	// Compute sign, exponent, fraction
+	if (isNaN(value)) {
+		// NaN
+		// http://dev.w3.org/2006/webapi/WebIDL/#es-type-mapping
+		e = (1 << ebits) - 1;
+		fraction = pow(2, fbits - 1);
+		sign = 0;
+	} else if (value === Infinity || value === -Infinity) {
+		e = (1 << ebits) - 1;
+		fraction = 0;
+		sign = value < 0 ? 1 : 0;
+	} else if (value === 0) {
+		e = 0;
+		fraction = 0;
+		sign = 1 / value === -Infinity ? 1 : 0;
+	} else {
+		sign = value < 0;
+		value = abs(value);
+
+		if (value >= pow(2, 1 - bias)) {
+			e = min(floor(log(value) / LN2), 1023);
+			fraction = roundToEven((value / pow(2, e)) * pow(2, fbits));
+			if (fraction / pow(2, fbits) >= 2) {
+				e += 1;
+				fraction = 1;
+			}
+			if (e > bias) {
+				// Overflow
+				e = (1 << ebits) - 1;
+				fraction = 0;
+			} else {
+				// Normal
+				e += bias;
+				fraction -= pow(2, fbits);
+			}
+		} else {
+			// Subnormal
+			e = 0;
+			fraction = roundToEven(value / pow(2, 1 - bias - fbits));
+		}
+	}
+
+	// Pack sign, exponent, fraction
+	bits = [];
+	for (i = fbits; i; i -= 1) {
+		bits.push(fraction % 2 ? 1 : 0);
+		fraction = floor(fraction / 2);
+	}
+	for (i = ebits; i; i -= 1) {
+		bits.push(e % 2 ? 1 : 0);
+		e = floor(e / 2);
+	}
+	bits.push(sign ? 1 : 0);
+	bits.reverse();
+	str = bits.join("");
+
+	// Bits to bytes
+	bytes = [];
+	while (str.length) {
+		bytes.push(parseInt(str.substring(0, 8), 2));
+		str = str.substring(8);
+	}
+	return bytes;
+};