Merge pull request #2903 from k9mail/decrypted-preamble

package com.fsck.k9.mailstore;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

        @Override

        public void preamble(InputStream is) throws MimeException, IOException {

            // Do nothing

            expect(MimeMultipart.class);

            ByteArrayOutputStream preamble = new ByteArrayOutputStream();

            IOUtils.copy(is, preamble);

            ((MimeMultipart)stack.peek()).setPreamble(preamble.toByteArray());

        }

        @Override

        public void epilogue(InputStream is) throws MimeException, IOException {

            // Do nothing

            expect(MimeMultipart.class);

            ByteArrayOutputStream epilogue = new ByteArrayOutputStream();

            IOUtils.copy(is, epilogue);

            ((MimeMultipart) stack.peek()).setEpilogue(epilogue.toByteArray());

        }

        @Override

        public void raw(InputStream is) throws MimeException, IOException {

            throw new IllegalStateException("Not implemented");

        }

        private void expect(Class<?> c) {

            if (!c.isInstance(stack.peek())) {

                throw new IllegalStateException("Internal stack error: " + "Expected '"

                        + c.getName() + "' found '" + stack.peek().getClass().getName() + "'");

            }

        }

    }

}