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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.cos;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import org.apache.pdfbox.filter.Filter;
import org.apache.pdfbox.io.ScratchFile;
/**
* An OutputStream which writes to an encoded COS stream.
*
* @author John Hewson
*/
public final class COSOutputStream extends FilterOutputStream
{
private final List filters;
private final COSDictionary parameters;
// todo: this is an in-memory buffer, should use scratch file (if any) instead
private ByteArrayOutputStream buffer = new ByteArrayOutputStream();
/**
* Creates a new COSOutputStream writes to an encoded COS stream.
*
* @param filters Filters to apply.
* @param parameters Filter parameters.
* @param output Encoded stream.
* @param scratchFile Scratch file to use, or null.
*/
COSOutputStream(List filters, COSDictionary parameters, OutputStream output,
ScratchFile scratchFile)
{
super(output);
this.filters = filters;
this.parameters = parameters;
}
@Override
public void write(byte[] b) throws IOException
{
buffer.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException
{
buffer.write(b, off, len);
}
@Override
public void write(int b) throws IOException
{
buffer.write(b);
}
@Override
public void flush() throws IOException
{
}
@Override
public void close() throws IOException
{
// apply filters in reverse order
for (int i = filters.size() - 1; i >= 0; i--)
{
// todo: this is an in-memory buffer, should use scratch file (if any) instead
ByteArrayInputStream input = new ByteArrayInputStream(buffer.toByteArray());
buffer = new ByteArrayOutputStream();
filters.get(i).encode(input, buffer, parameters, i);
}
// flush the entire stream
out.write(buffer.toByteArray());
super.close();
}
}