org.apache.pdfbox.pdfparser.PDFObjectStreamParser Maven / Gradle / Ivy
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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.pdfparser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.cos.COSStream;
/**
* This will parse a PDF 1.5 object stream and extract all of the objects from the stream.
*
* @author Ben Litchfield
*
*/
public class PDFObjectStreamParser extends BaseParser
{
/**
* Log instance.
*/
private static final Log LOG = LogFactory.getLog(PDFObjectStreamParser.class);
private List streamObjects = null;
private final COSStream stream;
/**
* Constructor.
*
* @param stream The stream to parse.
* @param document The document for the current parsing.
* @throws IOException If there is an error initializing the stream.
*/
public PDFObjectStreamParser(COSStream stream, COSDocument document) throws IOException
{
super(new InputStreamSource(stream.createInputStream()));
this.stream = stream;
this.document = document;
}
/**
* This will parse the tokens in the stream. This will close the
* stream when it is finished parsing.
*
* @throws IOException If there is an error while parsing the stream.
*/
public void parse() throws IOException
{
try
{
//need to first parse the header.
int numberOfObjects = stream.getInt( "N" );
List objectNumbers = new ArrayList( numberOfObjects );
streamObjects = new ArrayList( numberOfObjects );
for( int i=0; i= objectNumbers.size())
{
LOG.error("/ObjStm (object stream) has more objects than /N " + numberOfObjects);
break;
}
object.setObjectNumber( objectNumbers.get( objectCounter) );
streamObjects.add( object );
if(LOG.isDebugEnabled())
{
LOG.debug( "parsed=" + object );
}
// According to the spec objects within an object stream shall not be enclosed
// by obj/endobj tags, but there are some pdfs in the wild using those tags
// skip endobject marker if present
if (!seqSource.isEOF() && seqSource.peek() == 'e')
{
readLine();
}
objectCounter++;
}
}
finally
{
seqSource.close();
}
}
/**
* This will get the objects that were parsed from the stream.
*
* @return All of the objects in the stream.
*/
public List getObjects()
{
return streamObjects;
}
}