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utf8mb4
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utf8mb4
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node_modules/es5-ext/math/_unpack-ieee754.js
| 33 lines
| 927 B
| application/javascript
| JavascriptLexer
|
| r789 | /* eslint no-bitwise: "off" */ | |||
| // Credit: https://github.com/paulmillr/es6-shim/ | ||||
| "use strict"; | ||||
| var pow = Math.pow; | ||||
| module.exports = function (bytes, ebits, fbits) { | ||||
| // Bytes to bits | ||||
| var bits = [], i, j, bit, str, bias, sign, e, fraction; | ||||
| for (i = bytes.length; i; i -= 1) { | ||||
| bit = bytes[i - 1]; | ||||
| for (j = 8; j; j -= 1) { | ||||
| bits.push(bit % 2 ? 1 : 0); | ||||
| bit >>= 1; | ||||
| } | ||||
| } | ||||
| bits.reverse(); | ||||
| str = bits.join(""); | ||||
| // Unpack sign, exponent, fraction | ||||
| bias = (1 << (ebits - 1)) - 1; | ||||
| sign = parseInt(str.substring(0, 1), 2) ? -1 : 1; | ||||
| e = parseInt(str.substring(1, 1 + ebits), 2); | ||||
| fraction = parseInt(str.substring(1 + ebits), 2); | ||||
| // Produce number | ||||
| if (e === (1 << ebits) - 1) return fraction === 0 ? sign * Infinity : NaN; | ||||
| if (e > 0) return sign * pow(2, e - bias) * (1 + fraction / pow(2, fbits)); | ||||
| if (fraction !== 0) return sign * pow(2, -(bias - 1)) * (fraction / pow(2, fbits)); | ||||
| return sign < 0 ? -0 : 0; | ||||
| }; | ||||