File: //home/workzeni/stream-flix.workzenix.com/node_modules/tar/dist/commonjs/header.js.map
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parse a 512-byte header block to a data object, or vice-versa\n// encode returns `true` if a pax extended header is needed, because\n// the data could not be faithfully encoded in a simple header.\n// (Also, check header.needPax to see if it needs a pax header.)\n\nimport { posix as pathModule } from 'node:path'\nimport * as large from './large-numbers.js'\nimport type { EntryTypeCode, EntryTypeName } from './types.js'\nimport * as types from './types.js'\n\nexport type HeaderData = {\n path?: string\n mode?: number\n uid?: number\n gid?: number\n size?: number\n cksum?: number\n type?: EntryTypeName | 'Unsupported'\n linkpath?: string\n uname?: string\n gname?: string\n devmaj?: number\n devmin?: number\n atime?: Date\n ctime?: Date\n mtime?: Date\n\n // fields that are common in extended PAX headers, but not in the\n // \"standard\" tar header block\n charset?: string\n comment?: string\n dev?: number\n ino?: number\n nlink?: number\n}\n\nexport class Header implements HeaderData {\n cksumValid: boolean = false\n needPax: boolean = false\n nullBlock: boolean = false\n\n block?: Buffer\n path?: string\n mode?: number\n uid?: number\n gid?: number\n size?: number\n cksum?: number\n #type: EntryTypeCode | 'Unsupported' = 'Unsupported'\n linkpath?: string\n uname?: string\n gname?: string\n devmaj: number = 0\n devmin: number = 0\n atime?: Date\n ctime?: Date\n mtime?: Date\n\n charset?: string\n comment?: string\n\n constructor(\n data?: Buffer | HeaderData,\n off: number = 0,\n ex?: HeaderData,\n gex?: HeaderData,\n ) {\n if (Buffer.isBuffer(data)) {\n this.decode(data, off || 0, ex, gex)\n } else if (data) {\n this.#slurp(data)\n }\n }\n\n decode(\n buf: Buffer,\n off: number,\n ex?: HeaderData,\n gex?: HeaderData,\n ) {\n if (!off) {\n off = 0\n }\n\n if (!buf || !(buf.length >= off + 512)) {\n throw new Error('need 512 bytes for header')\n }\n\n this.path = decString(buf, off, 100)\n this.mode = decNumber(buf, off + 100, 8)\n this.uid = decNumber(buf, off + 108, 8)\n this.gid = decNumber(buf, off + 116, 8)\n this.size = decNumber(buf, off + 124, 12)\n this.mtime = decDate(buf, off + 136, 12)\n this.cksum = decNumber(buf, off + 148, 12)\n\n // if we have extended or global extended headers, apply them now\n // See https://github.com/npm/node-tar/pull/187\n // Apply global before local, so it overrides\n if (gex) this.#slurp(gex, true)\n if (ex) this.#slurp(ex)\n\n // old tar versions marked dirs as a file with a trailing /\n const t = decString(buf, off + 156, 1)\n if (types.isCode(t)) {\n this.#type = t || '0'\n }\n if (this.#type === '0' && this.path.slice(-1) === '/') {\n this.#type = '5'\n }\n\n // tar implementations sometimes incorrectly put the stat(dir).size\n // as the size in the tarball, even though Directory entries are\n // not able to have any body at all. In the very rare chance that\n // it actually DOES have a body, we weren't going to do anything with\n // it anyway, and it'll just be a warning about an invalid header.\n if (this.#type === '5') {\n this.size = 0\n }\n\n this.linkpath = decString(buf, off + 157, 100)\n if (\n buf.subarray(off + 257, off + 265).toString() ===\n 'ustar\\u000000'\n ) {\n this.uname = decString(buf, off + 265, 32)\n this.gname = decString(buf, off + 297, 32)\n /* c8 ignore start */\n this.devmaj = decNumber(buf, off + 329, 8) ?? 0\n this.devmin = decNumber(buf, off + 337, 8) ?? 0\n /* c8 ignore stop */\n if (buf[off + 475] !== 0) {\n // definitely a prefix, definitely >130 chars.\n const prefix = decString(buf, off + 345, 155)\n this.path = prefix + '/' + this.path\n } else {\n const prefix = decString(buf, off + 345, 130)\n if (prefix) {\n this.path = prefix + '/' + this.path\n }\n this.atime = decDate(buf, off + 476, 12)\n this.ctime = decDate(buf, off + 488, 12)\n }\n }\n\n let sum = 8 * 0x20\n for (let i = off; i < off + 148; i++) {\n sum += buf[i] as number\n }\n\n for (let i = off + 156; i < off + 512; i++) {\n sum += buf[i] as number\n }\n\n this.cksumValid = sum === this.cksum\n if (this.cksum === undefined && sum === 8 * 0x20) {\n this.nullBlock = true\n }\n }\n\n #slurp(ex: HeaderData, gex: boolean = false) {\n Object.assign(\n this,\n Object.fromEntries(\n Object.entries(ex).filter(([k, v]) => {\n // we slurp in everything except for the path attribute in\n // a global extended header, because that's weird. Also, any\n // null/undefined values are ignored.\n return !(\n v === null ||\n v === undefined ||\n (k === 'path' && gex) ||\n (k === 'linkpath' && gex) ||\n k === 'global'\n )\n }),\n ),\n )\n }\n\n encode(buf?: Buffer, off: number = 0) {\n if (!buf) {\n buf = this.block = Buffer.alloc(512)\n }\n\n if (this.#type === 'Unsupported') {\n this.#type = '0'\n }\n\n if (!(buf.length >= off + 512)) {\n throw new Error('need 512 bytes for header')\n }\n\n const prefixSize = this.ctime || this.atime ? 130 : 155\n const split = splitPrefix(this.path || '', prefixSize)\n const path = split[0]\n const prefix = split[1]\n this.needPax = !!split[2]\n\n this.needPax = encString(buf, off, 100, path) || this.needPax\n this.needPax =\n encNumber(buf, off + 100, 8, this.mode) || this.needPax\n this.needPax =\n encNumber(buf, off + 108, 8, this.uid) || this.needPax\n this.needPax =\n encNumber(buf, off + 116, 8, this.gid) || this.needPax\n this.needPax =\n encNumber(buf, off + 124, 12, this.size) || this.needPax\n this.needPax =\n encDate(buf, off + 136, 12, this.mtime) || this.needPax\n buf[off + 156] = this.#type.charCodeAt(0)\n this.needPax =\n encString(buf, off + 157, 100, this.linkpath) || this.needPax\n buf.write('ustar\\u000000', off + 257, 8)\n this.needPax =\n encString(buf, off + 265, 32, this.uname) || this.needPax\n this.needPax =\n encString(buf, off + 297, 32, this.gname) || this.needPax\n this.needPax =\n encNumber(buf, off + 329, 8, this.devmaj) || this.needPax\n this.needPax =\n encNumber(buf, off + 337, 8, this.devmin) || this.needPax\n this.needPax =\n encString(buf, off + 345, prefixSize, prefix) || this.needPax\n if (buf[off + 475] !== 0) {\n this.needPax =\n encString(buf, off + 345, 155, prefix) || this.needPax\n } else {\n this.needPax =\n encString(buf, off + 345, 130, prefix) || this.needPax\n this.needPax =\n encDate(buf, off + 476, 12, this.atime) || this.needPax\n this.needPax =\n encDate(buf, off + 488, 12, this.ctime) || this.needPax\n }\n\n let sum = 8 * 0x20\n for (let i = off; i < off + 148; i++) {\n sum += buf[i] as number\n }\n\n for (let i = off + 156; i < off + 512; i++) {\n sum += buf[i] as number\n }\n\n this.cksum = sum\n encNumber(buf, off + 148, 8, this.cksum)\n this.cksumValid = true\n\n return this.needPax\n }\n\n get type(): EntryTypeName {\n return (\n this.#type === 'Unsupported' ?\n this.#type\n : types.name.get(this.#type)) as EntryTypeName\n }\n\n get typeKey(): EntryTypeCode | 'Unsupported' {\n return this.#type\n }\n\n set type(type: EntryTypeCode | EntryTypeName | 'Unsupported') {\n const c = String(types.code.get(type as EntryTypeName))\n if (types.isCode(c) || c === 'Unsupported') {\n this.#type = c\n } else if (types.isCode(type)) {\n this.#type = type\n } else {\n throw new TypeError('invalid entry type: ' + type)\n }\n }\n}\n\nconst splitPrefix = (\n p: string,\n prefixSize: number,\n): [string, string, boolean] => {\n const pathSize = 100\n let pp = p\n let prefix = ''\n let ret: undefined | [string, string, boolean] = undefined\n const root = pathModule.parse(p).root || '.'\n\n if (Buffer.byteLength(pp) < pathSize) {\n ret = [pp, prefix, false]\n } else {\n // first set prefix to the dir, and path to the base\n prefix = pathModule.dirname(pp)\n pp = pathModule.basename(pp)\n\n do {\n if (\n Buffer.byteLength(pp) <= pathSize &&\n Buffer.byteLength(prefix) <= prefixSize\n ) {\n // both fit!\n ret = [pp, prefix, false]\n } else if (\n Buffer.byteLength(pp) > pathSize &&\n Buffer.byteLength(prefix) <= prefixSize\n ) {\n // prefix fits in prefix, but path doesn't fit in path\n ret = [pp.slice(0, pathSize - 1), prefix, true]\n } else {\n // make path take a bit from prefix\n pp = pathModule.join(pathModule.basename(prefix), pp)\n prefix = pathModule.dirname(prefix)\n }\n } while (prefix !== root && ret === undefined)\n\n // at this point, found no resolution, just truncate\n if (!ret) {\n ret = [p.slice(0, pathSize - 1), '', true]\n }\n }\n return ret\n}\n\nconst decString = (buf: Buffer, off: number, size: number) =>\n buf\n .subarray(off, off + size)\n .toString('utf8')\n .replace(/\\0.*/, '')\n\nconst decDate = (buf: Buffer, off: number, size: number) =>\n numToDate(decNumber(buf, off, size))\n\nconst numToDate = (num?: number) =>\n num === undefined ? undefined : new Date(num * 1000)\n\nconst decNumber = (buf: Buffer, off: number, size: number) =>\n Number(buf[off]) & 0x80 ?\n large.parse(buf.subarray(off, off + size))\n : decSmallNumber(buf, off, size)\n\nconst nanUndef = (value: number) => (isNaN(value) ? undefined : value)\n\nconst decSmallNumber = (buf: Buffer, off: number, size: number) =>\n nanUndef(\n parseInt(\n buf\n .subarray(off, off + size)\n .toString('utf8')\n .replace(/\\0.*$/, '')\n .trim(),\n 8,\n ),\n )\n\n// the maximum encodable as a null-terminated octal, by field size\nconst MAXNUM = {\n 12: 0o77777777777,\n 8: 0o7777777,\n}\n\nconst encNumber = (\n buf: Buffer,\n off: number,\n size: 12 | 8,\n num?: number,\n) =>\n num === undefined ? false\n : num > MAXNUM[size] || num < 0 ?\n (large.encode(num, buf.subarray(off, off + size)), true)\n : (encSmallNumber(buf, off, size, num), false)\n\nconst encSmallNumber = (\n buf: Buffer,\n off: number,\n size: number,\n num: number,\n) => buf.write(octalString(num, size), off, size, 'ascii')\n\nconst octalString = (num: number, size: number) =>\n padOctal(Math.floor(num).toString(8), size)\n\nconst padOctal = (str: string, size: number) =>\n (str.length === size - 1 ?\n str\n : new Array(size - str.length - 1).join('0') + str + ' ') + '\\0'\n\nconst encDate = (\n buf: Buffer,\n off: number,\n size: 8 | 12,\n date?: Date,\n) =>\n date === undefined ? false : (\n encNumber(buf, off, size, date.getTime() / 1000)\n )\n\n// enough to fill the longest string we've got\nconst NULLS = new Array(156).join('\\0')\n// pad with nulls, return true if it's longer or non-ascii\nconst encString = (\n buf: Buffer,\n off: number,\n size: number,\n str?: string,\n) =>\n str === undefined ? false : (\n (buf.write(str + NULLS, off, size, 'utf8'),\n str.length !== Buffer.byteLength(str) || str.length > size)\n )\n"]}