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The Apache PDFBox library is an open source Java tool for working with PDF documents.

There is a newer version: 3.0.2

/*
 * 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;

/**
 * The IdentityFilter filter passes the data through without any modifications.
 * It is defined in section 7.6.5 of the PDF 1.7 spec and also stated in table 26.
 * 
 * @author Adam Nichols
 */
final class IdentityFilter extends Filter
{
    private static final int BUFFER_SIZE = 1024;

    @Override
    public DecodeResult decode(InputStream encoded, OutputStream decoded,
                                         COSDictionary parameters, int index)
        throws IOException
    {
        byte[] buffer = new byte[BUFFER_SIZE];
        int amountRead;
        while((amountRead = encoded.read(buffer, 0, BUFFER_SIZE)) != -1)
        {
            decoded.write(buffer, 0, amountRead);
        }
        decoded.flush();
        return new DecodeResult(parameters);
    }

    @Override
    protected void encode(InputStream input, OutputStream encoded, COSDictionary parameters)
        throws IOException
    {
        byte[] buffer = new byte[BUFFER_SIZE];
        int amountRead;
        while((amountRead = input.read(buffer, 0, BUFFER_SIZE)) != -1)
        {
            encoded.write(buffer, 0, amountRead);
        }
        encoded.flush();
    }
}