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{ createHash, randomBytes } from \"crypto\"\nimport { newError } from \"./index\"\n\nconst invalidName = \"options.name must be either a string or a Buffer\"\n\n// Node ID according to rfc4122#section-4.5\nconst randomHost = randomBytes(16)\nrandomHost[0] = randomHost[0] | 0x01\n\n// lookup table hex to byte\nconst hex2byte: any = {}\n\n// lookup table byte to hex\nconst byte2hex: Array<string> = []\n// populate lookup tables\nfor (let i = 0; i < 256; i++) {\n    const hex = (i + 0x100).toString(16).substr(1)\n    hex2byte[hex] = i\n    byte2hex[i] = hex\n}\n\n// UUID class\nexport class UUID {\n  private ascii: string | null = null\n  private readonly binary: Buffer | null = null\n  private readonly version: number\n\n  // from rfc4122#appendix-C\n  static readonly OID = UUID.parse(\"6ba7b812-9dad-11d1-80b4-00c04fd430c8\")\n\n  constructor(uuid: Buffer | string) {\n    const check = UUID.check(uuid)\n    if (!check) {\n      throw new Error(\"not a UUID\")\n    }\n\n    this.version = check.version!!\n\n    if (check.format === \"ascii\") {\n      this.ascii = uuid as string\n    }\n    else {\n      this.binary = uuid as Buffer\n    }\n  }\n\n  static v5(name: string | Buffer, namespace: Buffer) {\n    return uuidNamed(name, \"sha1\", 0x50, namespace)\n  }\n\n  toString() {\n    if (this.ascii == null) {\n      this.ascii = stringify(this.binary!!)\n    }\n    return this.ascii\n  }\n\n  inspect() {\n    return `UUID v${this.version} ${this.toString()}`\n  }\n\n  static check(uuid: Buffer | string, offset: number = 0) {\n    if (typeof uuid === \"string\") {\n      uuid = uuid.toLowerCase()\n\n      if (!/^[a-f0-9]{8}(-[a-f0-9]{4}){3}-([a-f0-9]{12})$/.test(uuid)) {\n        return false\n      }\n\n      if (uuid === \"00000000-0000-0000-0000-000000000000\") {\n        return {version: undefined, variant: \"nil\", format: \"ascii\"}\n      }\n\n      return {\n        version: (hex2byte[uuid[14] + uuid[15]] & 0xf0) >> 4,\n        variant: getVariant((hex2byte[uuid[19] + uuid[20]] & 0xe0) >> 5),\n        format: \"ascii\"\n      }\n    }\n\n    if (Buffer.isBuffer(uuid)) {\n      if (uuid.length < offset + 16) {\n        return false\n      }\n\n      let i = 0\n      for (; i < 16; i++) {\n        if (uuid[offset + i] !== 0) {\n          break\n        }\n      }\n      if (i === 16) {\n        return {version: undefined, variant: \"nil\", format: \"binary\"}\n      }\n\n      return {\n        version: (uuid[offset + 6] & 0xf0) >> 4,\n        variant: getVariant((uuid[offset + 8] & 0xe0) >> 5),\n        format: \"binary\"\n      }\n    }\n\n    throw newError(\"Unknown type of uuid\", \"ERR_UNKNOWN_UUID_TYPE\")\n  }\n\n  // read stringified uuid into a Buffer\n  static parse(input: string) {\n    const buffer = Buffer.allocUnsafe(16)\n    let j = 0\n    for (let i = 0; i < 16; i++) {\n      buffer[i] = hex2byte[input[j++] + input[j++]]\n      if (i === 3 || i === 5 || i === 7 || i === 9) {\n        j += 1\n      }\n    }\n    return buffer\n  }\n}\n\n// according to rfc4122#section-4.1.1\nfunction getVariant(bits: number) {\n  switch (bits) {\n    case 0:\n    case 1:\n    case 3:\n      return \"ncs\"\n    case 4:\n    case 5:\n      return \"rfc4122\"\n    case 6:\n      return \"microsoft\"\n    default:\n      return \"future\"\n  }\n}\n\nenum UuidEncoding {\n  ASCII, BINARY, OBJECT\n}\n\n// v3 + v5\nfunction uuidNamed(name: string | Buffer, hashMethod: string, version: number, namespace: Buffer, encoding: UuidEncoding = UuidEncoding.ASCII) {\n  const hash = createHash(hashMethod)\n\n  const nameIsNotAString = typeof name !== \"string\"\n  if (nameIsNotAString && !Buffer.isBuffer(name)) {\n    throw newError(invalidName, \"ERR_INVALID_UUID_NAME\")\n  }\n\n  hash.update(namespace)\n  hash.update(name)\n\n  const buffer = hash.digest()\n  let result: any\n  switch (encoding) {\n    case UuidEncoding.BINARY:\n      buffer[6] = (buffer[6] & 0x0f) | version\n      buffer[8] = (buffer[8] & 0x3f) | 0x80\n      result = buffer\n      break\n    case UuidEncoding.OBJECT:\n      buffer[6] = (buffer[6] & 0x0f) | version\n      buffer[8] = (buffer[8] & 0x3f) | 0x80\n      result = new UUID(buffer)\n      break\n    default:\n      result = byte2hex[buffer[0]] + byte2hex[buffer[1]] +\n        byte2hex[buffer[2]] + byte2hex[buffer[3]] + \"-\" +\n        byte2hex[buffer[4]] + byte2hex[buffer[5]] + \"-\" +\n        byte2hex[(buffer[6] & 0x0f) | version] +\n        byte2hex[buffer[7]] + \"-\" +\n        byte2hex[(buffer[8] & 0x3f) | 0x80] +\n        byte2hex[buffer[9]] + \"-\" +\n        byte2hex[buffer[10]] + byte2hex[buffer[11]] +\n        byte2hex[buffer[12]] + byte2hex[buffer[13]] +\n        byte2hex[buffer[14]] + byte2hex[buffer[15]]\n      break\n  }\n  return result\n}\n\nfunction stringify(buffer: Buffer) {\n  return byte2hex[buffer[0]] + byte2hex[buffer[1]] +\n    byte2hex[buffer[2]] + byte2hex[buffer[3]] + \"-\" +\n    byte2hex[buffer[4]] + byte2hex[buffer[5]] + \"-\" +\n    byte2hex[buffer[6]] + byte2hex[buffer[7]] + \"-\" +\n    byte2hex[buffer[8]] + byte2hex[buffer[9]] + \"-\" +\n    byte2hex[buffer[10]] + byte2hex[buffer[11]] +\n    byte2hex[buffer[12]] + byte2hex[buffer[13]] +\n    byte2hex[buffer[14]] + byte2hex[buffer[15]]\n}\n\n// according to rfc4122#section-4.1.7\nexport const nil = new UUID(\"00000000-0000-0000-0000-000000000000\")\n\n// UUID.v4 = uuidRandom\n\n// UUID.v4fast = uuidRandomFast\n\n// UUID.v3 = function(options, callback) {\n//     return uuidNamed(\"md5\", 0x30, options, callback)\n// }"],"sourceRoot":""}