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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 1.8 and up. 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.cms;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.util.io.Streams;

class CMSProcessableInputStream implements CMSProcessable, CMSReadable
{
    private InputStream input;
    private boolean used = false;

    public CMSProcessableInputStream(
        InputStream input)
    {
        this.input = input;
    }

    public InputStream getInputStream()
    {
        checkSingleUsage();

        return input;
    }

    public void write(OutputStream zOut)
        throws IOException, CMSException
    {
        checkSingleUsage();

        Streams.pipeAll(input, zOut);
        input.close();
    }

    public Object getContent()
    {
        return getInputStream();
    }

    private synchronized void checkSingleUsage()
    {
        if (used)
        {
            throw new IllegalStateException("CMSProcessableInputStream can only be used once");
        }

        used = true;
    }
}