/*
* 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 org.apache.pdfbox.filter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
/**
* Decrypts data encrypted by a security handler, reproducing the data as it was before encryption.
* @author Adam Nichols
*/
final class CryptFilter extends Filter
{
@Override
public DecodeResult decode(InputStream encoded, OutputStream decoded,
COSDictionary parameters, int index) throws IOException
{
COSName encryptionName = (COSName) parameters.getDictionaryObject(COSName.NAME);
if(encryptionName == null || encryptionName.equals(COSName.IDENTITY))
{
// currently the only supported implementation is the Identity crypt filter
Filter identityFilter = new IdentityFilter();
identityFilter.decode(encoded, decoded, parameters, index);
return new DecodeResult(parameters);
}
throw new IOException("Unsupported crypt filter " + encryptionName.getName());
}
@Override
protected void encode(InputStream input, OutputStream encoded, COSDictionary parameters)
throws IOException
{
COSName encryptionName = (COSName) parameters.getDictionaryObject(COSName.NAME);
if(encryptionName == null || encryptionName.equals(COSName.IDENTITY))
{
// currently the only supported implementation is the Identity crypt filter
Filter identityFilter = new IdentityFilter();
identityFilter.encode(input, encoded, parameters);
}
else
{
throw new IOException("Unsupported crypt filter " + encryptionName.getName());
}
}
}