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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.io.InputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.io.IOUtils;
import org.apache.pdfbox.io.RandomAccessRead;
import org.apache.pdfbox.io.ScratchFile;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
public class PDFParser extends COSParser
{
private static final Log LOG = LogFactory.getLog(PDFParser.class);
/**
* Constructor.
* Unrestricted main memory will be used for buffering PDF streams.
*
* @param source source representing the pdf.
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source) throws IOException
{
this(source, "", ScratchFile.getMainMemoryOnlyInstance());
}
/**
* Constructor.
*
* @param source input representing the pdf.
* @param scratchFile use a {@link ScratchFile} for temporary storage.
*
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source, ScratchFile scratchFile) throws IOException
{
this(source, "", scratchFile);
}
/**
* Constructor.
* Unrestricted main memory will be used for buffering PDF streams.
*
* @param source input representing the pdf.
* @param decryptionPassword password to be used for decryption.
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source, String decryptionPassword) throws IOException
{
this(source, decryptionPassword, ScratchFile.getMainMemoryOnlyInstance());
}
/**
* Constructor.
*
* @param source input representing the pdf.
* @param decryptionPassword password to be used for decryption.
* @param scratchFile use a {@link ScratchFile} for temporary storage.
*
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source, String decryptionPassword, ScratchFile scratchFile)
throws IOException
{
this(source, decryptionPassword, null, null, scratchFile);
}
/**
* Constructor.
* Unrestricted main memory will be used for buffering PDF streams.
*
* @param source input representing the pdf.
* @param decryptionPassword password to be used for decryption.
* @param keyStore key store to be used for decryption when using public key security
* @param alias alias to be used for decryption when using public key security
*
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source, String decryptionPassword, InputStream keyStore,
String alias) throws IOException
{
this(source, decryptionPassword, keyStore, alias, ScratchFile.getMainMemoryOnlyInstance());
}
/**
* Constructor.
*
* @param source input representing the pdf.
* @param decryptionPassword password to be used for decryption.
* @param keyStore key store to be used for decryption when using public key security
* @param alias alias to be used for decryption when using public key security
* @param scratchFile buffer handler for temporary storage; it will be closed on
* {@link COSDocument#close()}
*
* @throws IOException If something went wrong.
*/
public PDFParser(RandomAccessRead source, String decryptionPassword, InputStream keyStore,
String alias, ScratchFile scratchFile) throws IOException
{
super(source, decryptionPassword, keyStore, alias);
fileLen = source.length();
init(scratchFile);
}
private void init(ScratchFile scratchFile) throws IOException
{
String eofLookupRangeStr = System.getProperty(SYSPROP_EOFLOOKUPRANGE);
if (eofLookupRangeStr != null)
{
try
{
setEOFLookupRange(Integer.parseInt(eofLookupRangeStr));
}
catch (NumberFormatException nfe)
{
LOG.warn("System property " + SYSPROP_EOFLOOKUPRANGE
+ " does not contain an integer value, but: '" + eofLookupRangeStr + "'");
}
}
document = new COSDocument(scratchFile);
}
/**
* This will get the PD document that was parsed. When you are done with
* this document you must call close() on it to release resources.
*
* @return The document at the PD layer.
*
* @throws IOException If there is an error getting the document.
*/
public PDDocument getPDDocument() throws IOException
{
PDDocument doc = new PDDocument(getDocument(), source, getAccessPermission());
doc.setEncryptionDictionary(getEncryption());
return doc;
}
/**
* The initial parse will first parse only the trailer, the xrefstart and all xref tables to have a pointer (offset)
* to all the pdf's objects. It can handle linearized pdfs, which will have an xref at the end pointing to an xref
* at the beginning of the file. Last the root object is parsed.
*
* @throws InvalidPasswordException If the password is incorrect.
* @throws IOException If something went wrong.
*/
protected void initialParse() throws InvalidPasswordException, IOException
{
COSDictionary trailer = retrieveTrailer();
COSBase base = parseTrailerValuesDynamically(trailer);
if (!(base instanceof COSDictionary))
{
throw new IOException("Expected root dictionary, but got this: " + base);
}
COSDictionary root = (COSDictionary) base;
// in some pdfs the type value "Catalog" is missing in the root object
if (isLenient() && !root.containsKey(COSName.TYPE))
{
root.setItem(COSName.TYPE, COSName.CATALOG);
}
// parse all objects, starting at the root dictionary
parseDictObjects(root, (COSName[]) null);
// parse all objects of the info dictionary
COSBase infoBase = trailer.getDictionaryObject(COSName.INFO);
if (infoBase instanceof COSDictionary)
{
parseDictObjects((COSDictionary) infoBase, (COSName[]) null);
}
// check pages dictionaries
checkPages(root);
document.setDecrypted();
initialParseDone = true;
}
/**
* This will parse the stream and populate the COSDocument object. This will close
* the keystore stream when it is done parsing.
*
* @throws InvalidPasswordException If the password is incorrect.
* @throws IOException If there is an error reading from the stream or corrupt data
* is found.
*/
public void parse() throws InvalidPasswordException, IOException
{
// set to false if all is processed
boolean exceptionOccurred = true;
try
{
// PDFBOX-1922 read the version header and rewind
if (!parsePDFHeader() && !parseFDFHeader())
{
throw new IOException( "Error: Header doesn't contain versioninfo" );
}
if (!initialParseDone)
{
initialParse();
}
exceptionOccurred = false;
}
finally
{
if (exceptionOccurred && document != null)
{
IOUtils.closeQuietly(document);
document = null;
}
}
}
}