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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.operator;

import java.io.OutputStream;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * General interface for an operator that is able to produce
 * an OutputStream that will output compressed data.
 */
public interface OutputCompressor
{
    /**
     * Return the algorithm identifier describing the compression
     * algorithm and parameters this compressor uses.
     *
     * @return algorithm oid and parameters.
     */
    AlgorithmIdentifier getAlgorithmIdentifier();

    /**
     * Wrap the passed in output stream comOut, returning an output stream
     * that compresses anything passed in before sending on to comOut.
     *
     * @param comOut output stream for compressed output.
     * @return a compressing OutputStream
     */
    OutputStream getOutputStream(OutputStream comOut);
}