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node_modules/es-abstract/helpers/bytesAsInteger.js
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drndsv
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14 апр 2025, 22:53
14 апр 2025, 22:53
641ac8a
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'use strict'; var GetIntrinsic = require('get-intrinsic'); var $pow = GetIntrinsic('%Math.pow%'); var $Number = GetIntrinsic('%Number%'); var $BigInt = GetIntrinsic('%BigInt%', true); module.exports = function bytesAsInteger(rawBytes, elementSize, isUnsigned, isBigInt) { var Z = isBigInt ? $BigInt : $Number; // this is common to both branches var intValue = Z(0); for (var i = 0; i < rawBytes.length; i++) { intValue += Z(rawBytes[i]) * Z($pow(2, 8 * i)); } /* Let intValue be the byte elements of rawBytes concatenated and interpreted as a bit string encoding of an unsigned little-endian binary number. */ if (!isUnsigned) { // steps 5-6 // Let intValue be the byte elements of rawBytes concatenated and interpreted as a bit string encoding of a binary little-endian 2's complement number of bit length elementSize × 8. var bitLength = elementSize * 8; if (rawBytes[elementSize - 1] & 0x80) { intValue -= Z($pow(2, bitLength)); } } return intValue; // step 7 };