source: trip-planner-front/node_modules/ieee754/index.js@ 1ad8e64

Last change on this file since 1ad8e64 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.1 KB
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1/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
2exports.read = function (buffer, offset, isLE, mLen, nBytes) {
3 var e, m
4 var eLen = (nBytes * 8) - mLen - 1
5 var eMax = (1 << eLen) - 1
6 var eBias = eMax >> 1
7 var nBits = -7
8 var i = isLE ? (nBytes - 1) : 0
9 var d = isLE ? -1 : 1
10 var s = buffer[offset + i]
11
12 i += d
13
14 e = s & ((1 << (-nBits)) - 1)
15 s >>= (-nBits)
16 nBits += eLen
17 for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
18
19 m = e & ((1 << (-nBits)) - 1)
20 e >>= (-nBits)
21 nBits += mLen
22 for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
23
24 if (e === 0) {
25 e = 1 - eBias
26 } else if (e === eMax) {
27 return m ? NaN : ((s ? -1 : 1) * Infinity)
28 } else {
29 m = m + Math.pow(2, mLen)
30 e = e - eBias
31 }
32 return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
33}
34
35exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
36 var e, m, c
37 var eLen = (nBytes * 8) - mLen - 1
38 var eMax = (1 << eLen) - 1
39 var eBias = eMax >> 1
40 var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
41 var i = isLE ? 0 : (nBytes - 1)
42 var d = isLE ? 1 : -1
43 var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
44
45 value = Math.abs(value)
46
47 if (isNaN(value) || value === Infinity) {
48 m = isNaN(value) ? 1 : 0
49 e = eMax
50 } else {
51 e = Math.floor(Math.log(value) / Math.LN2)
52 if (value * (c = Math.pow(2, -e)) < 1) {
53 e--
54 c *= 2
55 }
56 if (e + eBias >= 1) {
57 value += rt / c
58 } else {
59 value += rt * Math.pow(2, 1 - eBias)
60 }
61 if (value * c >= 2) {
62 e++
63 c /= 2
64 }
65
66 if (e + eBias >= eMax) {
67 m = 0
68 e = eMax
69 } else if (e + eBias >= 1) {
70 m = ((value * c) - 1) * Math.pow(2, mLen)
71 e = e + eBias
72 } else {
73 m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
74 e = 0
75 }
76 }
77
78 for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
79
80 e = (e << mLen) | m
81 eLen += mLen
82 for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
83
84 buffer[offset + i - d] |= s * 128
85}
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