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'use strict' // Tar can encode large and negative numbers using a leading byte of // 0xff for negative, and 0x80 for positive. const encode = (num, buf) => { if (!Number.isSafeInteger(num)) { // The number is so large that javascript cannot represent it with integer // precision. throw Error('cannot encode number outside of javascript safe integer range') } else if (num < 0) { encodeNegative(num, buf) } else { encodePositive(num, buf) } return buf } const encodePositive = (num, buf) => { buf[0] = 0x80 for (var i = buf.length; i > 1; i--) { buf[i - 1] = num & 0xff num = Math.floor(num / 0x100) } } const encodeNegative = (num, buf) => { buf[0] = 0xff var flipped = false num = num * -1 for (var i = buf.length; i > 1; i--) { var byte = num & 0xff num = Math.floor(num / 0x100) if (flipped) { buf[i - 1] = onesComp(byte) } else if (byte === 0) { buf[i - 1] = 0 } else { flipped = true buf[i - 1] = twosComp(byte) } } } const parse = (buf) => { const pre = buf[0] const value = pre === 0x80 ? pos(buf.slice(1, buf.length)) : pre === 0xff ? twos(buf) : null if (value === null) { throw Error('invalid base256 encoding') } if (!Number.isSafeInteger(value)) { // The number is so large that javascript cannot represent it with integer // precision. throw Error('parsed number outside of javascript safe integer range') } return value } const twos = (buf) => { var len = buf.length var sum = 0 var flipped = false for (var i = len - 1; i > -1; i--) { var byte = buf[i] var f if (flipped) { f = onesComp(byte) } else if (byte === 0) { f = byte } else { flipped = true f = twosComp(byte) } if (f !== 0) { sum -= f * Math.pow(256, len - i - 1) } } return sum } const pos = (buf) => { var len = buf.length var sum = 0 for (var i = len - 1; i > -1; i--) { var byte = buf[i] if (byte !== 0) { sum += byte * Math.pow(256, len - i - 1) } } return sum } const onesComp = byte => (0xff ^ byte) & 0xff const twosComp = byte => ((0xff ^ byte) + 1) & 0xff module.exports = { encode, parse, }