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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.mime;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public abstract class MimeWriter
{
    protected final Headers headers;

    protected MimeWriter(Headers headers)
    {
        this.headers = headers;
    }

    public Headers getHeaders()
    {
        return headers;
    }

    public abstract OutputStream getContentStream()
        throws IOException;


    protected static List mapToLines(Map headers)
    {
        List hdrs = new ArrayList(headers.size());

        for (Iterator it = headers.keySet().iterator(); it.hasNext();)
        {
            String key = (String)it.next();

            hdrs.add(key + ": " + headers.get(key));
        }

        return hdrs;
    }
}