xyz.tar.gz.pgp文件将被解密和提取，因此文件的每一行都可以一张一张地输出

Question

有些文件（xyz.tar.gz.pgp）很大，无法加载到内存中。使用Scala，我们需要解密和提取在流上运行的文件，以便我们应该能够访问文件的每一行，这些行可以进一步拆分并映射到数据库的某些列。

要解压缩，我尝试使用TarArchiveInputStream。它适用于tar.gz，但不适用于tar.gz.pgp。在解密如何将BCPGInputStream转换为TarArchiveInputStream可接受的InputStream时无法弄清。

我使用公钥/私钥对，试图通过流解密文件，但是它不起作用。

private[this] def decryptHelper[U](input: InputStream)(handler: PGPLiteralData => U): U = {
    val fixIn = PGPUtil.getDecoderStream(input)
    try {
      val objF = new JcaPGPObjectFactory(fixIn)
      // TODO - better method to advance to encrypted data.
      val enc = objF.nextObject match {
        case e: PGPEncryptedDataList => e
        case _                       => objF.nextObject.asInstanceOf[PGPEncryptedDataList]
      }
      import collection.JavaConverters._
      val it = enc.getEncryptedDataObjects()
      val pbe = (for {
        obj <- it.asInstanceOf[java.util.Iterator[AnyRef]].asScala
        if obj.isInstanceOf[PGPPublicKeyEncryptedData]
      } yield obj.asInstanceOf[PGPPublicKeyEncryptedData]).toTraversable.headOption.getOrElse {
        throw new IllegalArgumentException("Secret key for message not found.")
      }
      // TODO - Better exception?
      if(pbe.getKeyID != this.keyID) println(pbe.getKeyID)
      val privKey = nested
      println(privKey.getKeyID)
      val clear = {
        val provider = Security.getProvider("BC")
        val dataDecryptorFactory = new JcePublicKeyDataDecryptorFactoryBuilder().setProvider(provider).setContentProvider(provider).build(privKey)
        pbe.getDataStream(dataDecryptorFactory)
      }
      val plainFact = new JcaPGPObjectFactory(clear)
      // Handle compressed + uncompressed data here.
      def extractLiteral(x: Any): PGPLiteralData = x match {
        case msg: PGPLiteralData => msg
        case cData: PGPCompressedData =>
          // Now we need to read the compressed stream of data.
          val compressedStream = new BufferedInputStream(cData.getDataStream)
          val pgpFact = new JcaPGPObjectFactory(compressedStream)
          extractLiteral(pgpFact.nextObject)
       // case msg: PGPOnePassSignature => throw new NotEncryptedMessageException("Message is a signature")
       // case _                        => throw new NotEncryptedMessageException("Message is not a simple encyrpted file")
      }
      val msg = extractLiteral(plainFact.nextObject)
      val result = handler(msg)
      if(pbe.isIntegrityProtected && !pbe.verify()) println("Encrypted message failed integrity check.")
      result
    }
  }

应该能够逐行获取原始内容，以便可以将每一行进一步拆分以映射到数据库列