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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.mime;

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

import org.bouncycastle.mime.encoding.Base64InputStream;
import org.bouncycastle.mime.encoding.QuotedPrintableInputStream;

public class BasicMimeParser
    implements MimeParser
{
    private final InputStream src;
    private final MimeParserContext parserContext;
    private final String defaultContentTransferEncoding;
    private Headers headers;

    private boolean isMultipart = false;
    private final String boundary;

    public BasicMimeParser(
        InputStream src)
        throws IOException
    {
        this(null, new Headers(src, "7bit"), src);
    }

    public BasicMimeParser(
        MimeParserContext parserContext, InputStream src)
        throws IOException
    {
        this(parserContext, new Headers(src, parserContext.getDefaultContentTransferEncoding()), src);
    }

    public BasicMimeParser(
        Headers headers, InputStream content)
    {
        this(null, headers, content);
    }

    public BasicMimeParser(
        MimeParserContext parserContext, Headers headers, InputStream src)
    {
        if (headers.isMultipart())
        {
            isMultipart = true;
            boundary = headers.getBoundary();
        }
        else
        {
            boundary = null;
        }

        this.headers = headers;
        this.parserContext = parserContext;
        this.src = src;
        this.defaultContentTransferEncoding = (parserContext != null) ? parserContext.getDefaultContentTransferEncoding() : "7bit";
    }



    public void parse(MimeParserListener listener)
        throws IOException
    {
        MimeContext context = listener.createContext(parserContext, headers);

        String s;
        if (isMultipart)    // Signed
        {
            MimeMultipartContext mContext = (MimeMultipartContext)context;
            String startBoundary = "--" + boundary;
            boolean startFound = false;
            int partNo = 0;
            LineReader rd = new LineReader(src);
            while ((s = rd.readLine()) != null && !"--".equals(s))
            {
                if (startFound)
                {
                    InputStream inputStream = new BoundaryLimitedInputStream(src, boundary);
                    Headers headers = new Headers(inputStream, defaultContentTransferEncoding);

                    MimeContext partContext = mContext.createContext(partNo++);
                    inputStream = partContext.applyContext(headers, inputStream);

                    listener.object(parserContext, headers, processStream(headers, inputStream));

                    if (inputStream.read() >= 0)
                    {
                        throw new IOException("MIME object not fully processed");
                    }
                }
                else if (startBoundary.equals(s))
                {
                    startFound = true;
                    InputStream inputStream = new BoundaryLimitedInputStream(src, boundary);
                    Headers headers = new Headers(inputStream, defaultContentTransferEncoding);

                    MimeContext partContext = mContext.createContext(partNo++);
                    inputStream = partContext.applyContext(headers, inputStream);

                    listener.object(parserContext, headers, processStream(headers, inputStream));

                    if (inputStream.read() >= 0)
                    {
                        throw new IOException("MIME object not fully processed");
                    }
                }
            }
        }
        else
        {
            InputStream inputStream = context.applyContext(headers, src);

            listener.object(parserContext, headers, processStream(headers, inputStream));
        }
    }

    public boolean isMultipart()
    {
        return isMultipart;
    }

    private InputStream processStream(Headers headers, InputStream inputStream)
    {
        if (headers.getContentTransferEncoding().equals("base64"))
        {
            return new Base64InputStream(inputStream);
        }
        else if (headers.getContentTransferEncoding().equals("quoted-printable"))
        {
            return new QuotedPrintableInputStream(inputStream);
        }
        else
        {
            return inputStream;
        }
    }
}