CMSProcessableInputStream.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package PDFSignature;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSTypedData;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.pdfbox.io.IOUtils;

/**
 * Wraps a InputStream into a CMSProcessable object for bouncy castle. It's a
 * memory saving alternative to the
 * {@link org.bouncycastle.cms.CMSProcessableByteArray CMSProcessableByteArray}
 * class.
 *
 * @author Thomas Chojecki
 */
class CMSProcessableInputStream implements CMSTypedData {
	private InputStream in;
	private final ASN1ObjectIdentifier contentType;

	CMSProcessableInputStream(InputStream is) {
		this(new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId()), is);
	}

	CMSProcessableInputStream(ASN1ObjectIdentifier type, InputStream is) {
		contentType = type;
		in = is;
	}

	public Object getContent() {
		return in;
	}

	public void write(OutputStream out) throws IOException, CMSException {
		// read the content only one time
		IOUtils.copy(in, out);
		in.close();
	}

	public ASN1ObjectIdentifier getContentType() {
		return contentType;
	}
}