How to extract the file upload content in SOA-P 5 using HttpGateway?

Issue

• Here is an HttpGateway ESB action defined.

    <services>
      <service category="Vehicles" name="Cars" description="" invmScope="GLOBAL">
        <listeners>
            <http-gateway name="Http" urlPattern="esb-cars/*" payloadAs="BYTES"/>
        </listeners>
        <actions mep="RequestResponse">
          <action name="HttpAction" class="org.jboss.soa.esb.samples.quickstart.httpgateway.MAction"/>
        </actions>
      </service>
    </services>

This is working fine. It helps users to upload a file to the ESB action using the following HTML.

    <form action="http://localhost:8080/Quickstart_http_gateway/http/esb-cars/hello"
          enctype="multipart/form-data" method="post">
      <p>Please specify a file, or a set of files:<br>
      <input type="file" name="datafile" size="40">
      </p>
      <div><input type="submit" value="Send"></div>
    </form>

The problem arises during extracting the file contents from the message during the following invocation.

    byte[] content = (byte[])message.getBody().get();

It gives the following result.

    -----------------------------1119622724132079857230587322
    Content-Disposition: form-data; name="datafile"; filename="myfile"
    Content-Type: application/octet-stream
    This is a test file.

    -----------------------------1119622724132079857230587322--

Is there a way to extract only the part of the http request that has the file contents?