(buffer, offset, value, isLE, mLen, nBytes)
| 62 | * @param {!number} nBytes Value size in bytes (float = 4; double = 8) |
| 63 | */ |
| 64 | let ieee754write = function (buffer, offset, value, isLE, mLen, nBytes) { |
| 65 | let e, m, c |
| 66 | let eLen = (nBytes * 8) - mLen - 1 |
| 67 | let eMax = (1 << eLen) - 1 |
| 68 | let eBias = eMax >> 1 |
| 69 | let rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0) |
| 70 | let i = isLE ? 0 : (nBytes - 1) |
| 71 | let d = isLE ? 1 : -1 |
| 72 | let s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0 |
| 73 | |
| 74 | value = Math.abs(value) |
| 75 | |
| 76 | if (isNaN(value) || value === Infinity) { |
| 77 | m = isNaN(value) ? 1 : 0 |
| 78 | e = eMax |
| 79 | } else { |
| 80 | e = Math.floor(Math.log(value) / Math.LN2) |
| 81 | if (value * (c = Math.pow(2, -e)) < 1) { |
| 82 | e-- |
| 83 | c *= 2 |
| 84 | } |
| 85 | if (e + eBias >= 1) { |
| 86 | value += rt / c |
| 87 | } else { |
| 88 | value += rt * Math.pow(2, 1 - eBias) |
| 89 | } |
| 90 | if (value * c >= 2) { |
| 91 | e++ |
| 92 | c /= 2 |
| 93 | } |
| 94 | |
| 95 | if (e + eBias >= eMax) { |
| 96 | m = 0 |
| 97 | e = eMax |
| 98 | } else if (e + eBias >= 1) { |
| 99 | m = ((value * c) - 1) * Math.pow(2, mLen) |
| 100 | e = e + eBias |
| 101 | } else { |
| 102 | m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen) |
| 103 | e = 0 |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8); |
| 108 | |
| 109 | e = (e << mLen) | m |
| 110 | eLen += mLen |
| 111 | for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8); |
| 112 | |
| 113 | buffer[offset + i - d] |= s * 128 |
| 114 | } |
| 115 | |
| 116 | exports.ieee754write = ieee754write |
no outgoing calls
no test coverage detected