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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg;

import java.io.IOException;

/**
 * A generic compressed data object.
 */
public class CompressedDataPacket
    extends InputStreamPacket
{
    int    algorithm;

    CompressedDataPacket(
            BCPGInputStream    in)
            throws IOException
    {
        this(in, false);
    }

    CompressedDataPacket(
        BCPGInputStream    in,
        boolean newPacketFormat)
        throws IOException
    {
        super(in, COMPRESSED_DATA, newPacketFormat);

        algorithm = in.read();
    }

    /**
     * Gets the {@link CompressionAlgorithmTags compression algorithm} used for this packet.
     * 
     * @return the compression algorithm tag value.
     */
    public int getAlgorithm()
    {
        return algorithm;
    }
}