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| /* from: https://gist.github.com/bartaz/1119041 */ | |
| /* bug fixed, as mentioned in comments of the link above */ | |
| function toIEEE754DoubleString(v) { | |
| return toIEEE754Double(v) | |
| .map(function (n) { | |
| for(n = n.toString(2); n.length < 8; n="0"+n); | |
| return n; | |
| }) | |
| .join('') | |
| .replace(/(.)(.{11})(.{52})/, "$1 $2 $3") | |
| } | |
| function toIEEE754Double(v) { | |
| var ebits = 11, fbits = 52; | |
| var bias = (1 << (ebits - 1)) - 1; | |
| var s, e, f; | |
| if (isNaN(v)) { | |
| e = (1 << bias) - 1; f = Math.pow(2, 51); s = 0; | |
| } else if (v === Infinity || v === -Infinity) { | |
| e = (1 << bias) - 1; f = 0; s = (v < 0) ? 1 : 0; | |
| } else if (v === 0) { | |
| e = 0; f = 0; s = (1 / v === -Infinity) ? 1 : 0; | |
| } else { | |
| s = v < 0; | |
| v = Math.abs(v); | |
| if (v >= Math.pow(2, 1 - bias)) { | |
| var ln = Math.min(Math.floor(Math.log(v) / Math.LN2), bias); | |
| e = ln + bias; | |
| f = v * Math.pow(2, -ln) * Math.pow(2, fbits) - Math.pow(2, fbits); | |
| } else { | |
| e = 0; | |
| f = v * Math.pow(2, bias - 1) * Math.pow(2, fbits); | |
| } | |
| } | |
| var i, bits = []; | |
| for (i = fbits; i; i -= 1) { bits.push(f % 2 ? 1 : 0); f = Math.floor(f / 2); } | |
| for (i = ebits; i; i -= 1) { bits.push(e % 2 ? 1 : 0); e = Math.floor(e / 2); } | |
| bits.push(s ? 1 : 0); | |
| bits.reverse(); | |
| var str = bits.join(''), bytes = []; | |
| while (str.length) { | |
| bytes.push(parseInt(str.substring(0, 8), 2)); | |
| str = str.substring(8); | |
| } | |
| return bytes; | |
| } |
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