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## org.bouncycastle.openpgp
Class PGPCompressedDataGenerator

    java.lang.Object
      org.bouncycastle.openpgp.PGPCompressedDataGenerator

All Implemented Interfaces:
  CompressionAlgorithmTags

    public class PGPCompressedDataGenerator

extends java.lang.Object
implements CompressionAlgorithmTags

class for producing compressed data packets.

Field Summary

Fields inherited from interface org.bouncycastle.bcpg.CompressionAlgorithmTags
`BZIP2, UNCOMPRESSED, ZIP, ZLIB`

Constructor Summary
`PGPCompressedDataGenerator(int algorithm)`
`PGPCompressedDataGenerator(int algorithm, int compression)`

Method Summary
`void` | `close()` Close the compressed object - this is equivalent to calling close on the stream returned by the open() method.
`java.io.OutputStream` | `open(java.io.OutputStream out)` Return an outputstream which will save the data being written to the compressed object.
`java.io.OutputStream` | `open(java.io.OutputStream out, byte[] buffer)` Return an outputstream which will compress the data as it is written to it.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PGPCompressedDataGenerator

    public PGPCompressedDataGenerator(int algorithm)

### PGPCompressedDataGenerator

    public PGPCompressedDataGenerator(int algorithm,
                                      int compression)

Method Detail

### open

    public java.io.OutputStream open(java.io.OutputStream out)
                              throws java.io.IOException

  Return an outputstream which will save the data being written to the compressed object.

  The stream created can be closed off by either calling close() on the stream or close() on the generator. Closing the returned stream does not close off the OutputStream parameter out.

  Parameters:
    `out` - underlying OutputStream to be used.
  Returns:
    OutputStream
  Throws:
    `IOException,` - IllegalStateException
    `java.io.IOException`

### open

    public java.io.OutputStream open(java.io.OutputStream out,
                                     byte[] buffer)
                              throws java.io.IOException,
                                     PGPException

  Return an outputstream which will compress the data as it is written to it. The stream will be written out in chunks according to the size of the passed in buffer.

  The stream created can be closed off by either calling close() on the stream or close() on the generator. Closing the returned stream does not close off the OutputStream parameter out.

  Note: if the buffer is not a power of 2 in length only the largest power of 2 bytes worth of the buffer will be used.

  Note: using this may break compatability with RFC 1991 compliant tools. Only recent OpenPGP implementations are capable of accepting these streams.

  Parameters:
    `out` - underlying OutputStream to be used.
    `buffer` - the buffer to use.
  Returns:
    OutputStream
  Throws:
    `java.io.IOException`
    `PGPException`

### close

    public void close()
               throws java.io.IOException

  Close the compressed object - this is equivalent to calling close on the stream returned by the open() method.

  Throws:
    `java.io.IOException`

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