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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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 just passes the data through without any modifications.
* This is defined in section 7.6.5 of the PDF 1.7 spec and also stated in table
* 26.
*
* @author adam.nichols
*/
public class IdentityFilter implements Filter
{
private static final int BUFFER_SIZE = 1024;
/**
* {@inheritDoc}
*/
public void decode( InputStream compressedData, OutputStream result, COSDictionary options, int filterIndex )
throws IOException
{
byte[] buffer = new byte[BUFFER_SIZE];
int amountRead = 0;
while( (amountRead = compressedData.read( buffer, 0, BUFFER_SIZE )) != -1 )
{
result.write( buffer, 0, amountRead );
}
result.flush();
}
/**
* {@inheritDoc}
*/
public void encode( InputStream rawData, OutputStream result, COSDictionary options, int filterIndex )
throws IOException
{
byte[] buffer = new byte[BUFFER_SIZE];
int amountRead = 0;
while( (amountRead = rawData.read( buffer, 0, BUFFER_SIZE )) != -1 )
{
result.write( buffer, 0, amountRead );
}
result.flush();
}
}