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codeql-action/node_modules/es-abstract/helpers/bytesAsFloat32.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var $pow = GetIntrinsic('%Math.pow%'); | |
module.exports = function bytesAsFloat32(rawBytes) { | |
// return new Float32Array(new Uint8Array(rawBytes).buffer)[0]; | |
/* | |
Let value be the byte elements of rawBytes concatenated and interpreted as a little-endian bit string encoding of an IEEE 754-2008 binary32 value. | |
If value is an IEEE 754-2008 binary32 NaN value, return the NaN Number value. | |
Return the Number value that corresponds to value. | |
*/ | |
var sign = rawBytes[3] & 0x80 ? -1 : 1; // Check the sign bit | |
var exponent = ((rawBytes[3] & 0x7F) << 1) | |
| (rawBytes[2] >> 7); // Combine bits for exponent | |
var mantissa = ((rawBytes[2] & 0x7F) << 16) | |
| (rawBytes[1] << 8) | |
| rawBytes[0]; // Combine bits for mantissa | |
if (exponent === 0 && mantissa === 0) { | |
return sign === 1 ? 0 : -0; | |
} | |
if (exponent === 0xFF && mantissa === 0) { | |
return sign === 1 ? Infinity : -Infinity; | |
} | |
if (exponent === 0xFF && mantissa !== 0) { | |
return NaN; | |
} | |
exponent -= 127; // subtract the bias | |
if (exponent === -127) { | |
return sign * mantissa * $pow(2, -126 - 23); | |
} | |
return sign * (1 + (mantissa * $pow(2, -23))) * $pow(2, exponent); | |
}; |