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files >> //opt/alt/alt-nodejs19/root/lib/node_modules/npm/node_modules/tar/lib/pax.js
'use strict' const Header = require('./header.js') const path = require('path') class Pax { constructor (obj, global) { this.atime = obj.atime || null this.charset = obj.charset || null this.comment = obj.comment || null this.ctime = obj.ctime || null this.gid = obj.gid || null this.gname = obj.gname || null this.linkpath = obj.linkpath || null this.mtime = obj.mtime || null this.path = obj.path || null this.size = obj.size || null this.uid = obj.uid || null this.uname = obj.uname || null this.dev = obj.dev || null this.ino = obj.ino || null this.nlink = obj.nlink || null this.global = global || false } encode () { const body = this.encodeBody() if (body === '') { return null } const bodyLen = Buffer.byteLength(body) // round up to 512 bytes // add 512 for header const bufLen = 512 * Math.ceil(1 + bodyLen / 512) const buf = Buffer.allocUnsafe(bufLen) // 0-fill the header section, it might not hit every field for (let i = 0; i < 512; i++) { buf[i] = 0 } new Header({ // XXX split the path // then the path should be PaxHeader + basename, but less than 99, // prepend with the dirname path: ('PaxHeader/' + path.basename(this.path)).slice(0, 99), mode: this.mode || 0o644, uid: this.uid || null, gid: this.gid || null, size: bodyLen, mtime: this.mtime || null, type: this.global ? 'GlobalExtendedHeader' : 'ExtendedHeader', linkpath: '', uname: this.uname || '', gname: this.gname || '', devmaj: 0, devmin: 0, atime: this.atime || null, ctime: this.ctime || null, }).encode(buf) buf.write(body, 512, bodyLen, 'utf8') // null pad after the body for (let i = bodyLen + 512; i < buf.length; i++) { buf[i] = 0 } return buf } encodeBody () { return ( this.encodeField('path') + this.encodeField('ctime') + this.encodeField('atime') + this.encodeField('dev') + this.encodeField('ino') + this.encodeField('nlink') + this.encodeField('charset') + this.encodeField('comment') + this.encodeField('gid') + this.encodeField('gname') + this.encodeField('linkpath') + this.encodeField('mtime') + this.encodeField('size') + this.encodeField('uid') + this.encodeField('uname') ) } encodeField (field) { if (this[field] === null || this[field] === undefined) { return '' } const v = this[field] instanceof Date ? this[field].getTime() / 1000 : this[field] const s = ' ' + (field === 'dev' || field === 'ino' || field === 'nlink' ? 'SCHILY.' : '') + field + '=' + v + '\n' const byteLen = Buffer.byteLength(s) // the digits includes the length of the digits in ascii base-10 // so if it's 9 characters, then adding 1 for the 9 makes it 10 // which makes it 11 chars. let digits = Math.floor(Math.log(byteLen) / Math.log(10)) + 1 if (byteLen + digits >= Math.pow(10, digits)) { digits += 1 } const len = digits + byteLen return len + s } } Pax.parse = (string, ex, g) => new Pax(merge(parseKV(string), ex), g) const merge = (a, b) => b ? Object.keys(a).reduce((s, k) => (s[k] = a[k], s), b) : a const parseKV = string => string .replace(/\n$/, '') .split('\n') .reduce(parseKVLine, Object.create(null)) const parseKVLine = (set, line) => { const n = parseInt(line, 10) // XXX Values with \n in them will fail this. // Refactor to not be a naive line-by-line parse. if (n !== Buffer.byteLength(line) + 1) { return set } line = line.slice((n + ' ').length) const kv = line.split('=') const k = kv.shift().replace(/^SCHILY\.(dev|ino|nlink)/, '$1') if (!k) { return set } const v = kv.join('=') set[k] = /^([A-Z]+\.)?([mac]|birth|creation)time$/.test(k) ? new Date(v * 1000) : /^[0-9]+$/.test(v) ? +v : v return set } module.exports = Pax
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