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iText, a free Java-PDF library
/*
* $Id: 9ae457119bebc93a89b3136c61cbed2526ee08d7 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import com.itextpdf.text.log.Counter;
import com.itextpdf.text.log.CounterFactory;
/** Reads an FDF form and makes the fields available
* @author Paulo Soares
*/
public class FdfReader extends PdfReader {
HashMap fields;
String fileSpec;
PdfName encoding;
/** Reads an FDF form.
* @param filename the file name of the form
* @throws IOException on error
*/
public FdfReader(String filename) throws IOException {
super(filename);
}
/** Reads an FDF form.
* @param pdfIn the byte array with the form
* @throws IOException on error
*/
public FdfReader(byte pdfIn[]) throws IOException {
super(pdfIn);
}
/** Reads an FDF form.
* @param url the URL of the document
* @throws IOException on error
*/
public FdfReader(URL url) throws IOException {
super(url);
}
/** Reads an FDF form.
* @param is the InputStream containing the document. The stream is read to the
* end but is not closed
* @throws IOException on error
*/
public FdfReader(InputStream is) throws IOException {
super(is);
}
protected static Counter COUNTER = CounterFactory.getCounter(FdfReader.class);
protected Counter getCounter() {
return COUNTER;
}
@Override
protected void readPdf() throws IOException {
fields = new HashMap();
tokens.checkFdfHeader();
rebuildXref();
readDocObj();
readFields();
}
protected void kidNode(PdfDictionary merged, String name) {
PdfArray kids = merged.getAsArray(PdfName.KIDS);
if (kids == null || kids.isEmpty()) {
if (name.length() > 0)
name = name.substring(1);
fields.put(name, merged);
}
else {
merged.remove(PdfName.KIDS);
for (int k = 0; k < kids.size(); ++k) {
PdfDictionary dic = new PdfDictionary();
dic.merge(merged);
PdfDictionary newDic = kids.getAsDict(k);
PdfString t = newDic.getAsString(PdfName.T);
String newName = name;
if (t != null)
newName += "." + t.toUnicodeString();
dic.merge(newDic);
dic.remove(PdfName.T);
kidNode(dic, newName);
}
}
}
protected void readFields() {
catalog = trailer.getAsDict(PdfName.ROOT);
PdfDictionary fdf = catalog.getAsDict(PdfName.FDF);
if (fdf == null)
return;
PdfString fs = fdf.getAsString(PdfName.F);
if (fs != null)
fileSpec = fs.toUnicodeString();
PdfArray fld = fdf.getAsArray(PdfName.FIELDS);
if (fld == null)
return;
encoding = fdf.getAsName(PdfName.ENCODING);
PdfDictionary merged = new PdfDictionary();
merged.put(PdfName.KIDS, fld);
kidNode(merged, "");
}
/** Gets all the fields. The map is keyed by the fully qualified
* field name and the value is a merged PdfDictionary
* with the field content.
* @return all the fields
*/
public HashMap getFields() {
return fields;
}
/** Gets the field dictionary.
* @param name the fully qualified field name
* @return the field dictionary
*/
public PdfDictionary getField(String name) {
return fields.get(name);
}
/**
* Gets a byte[] containing a file that is embedded in the FDF.
* @param name the fully qualified field name
* @return the bytes of the file
* @throws IOException
* @since 5.0.1
*/
public byte[] getAttachedFile(String name) throws IOException {
PdfDictionary field = fields.get(name);
if (field != null) {
PdfIndirectReference ir = (PRIndirectReference)field.get(PdfName.V);
PdfDictionary filespec = (PdfDictionary)getPdfObject(ir.getNumber());
PdfDictionary ef = filespec.getAsDict(PdfName.EF);
ir = (PRIndirectReference)ef.get(PdfName.F);
PRStream stream = (PRStream)getPdfObject(ir.getNumber());
return getStreamBytes(stream);
}
return new byte[0];
}
/**
* Gets the field value or null if the field does not
* exist or has no value defined.
* @param name the fully qualified field name
* @return the field value or null
*/
public String getFieldValue(String name) {
PdfDictionary field = fields.get(name);
if (field == null)
return null;
PdfObject v = getPdfObject(field.get(PdfName.V));
if (v == null)
return null;
if (v.isName())
return PdfName.decodeName(((PdfName)v).toString());
else if (v.isString()) {
PdfString vs = (PdfString)v;
if (encoding == null || vs.getEncoding() != null)
return vs.toUnicodeString();
byte b[] = vs.getBytes();
if (b.length >= 2 && b[0] == (byte)254 && b[1] == (byte)255)
return vs.toUnicodeString();
try {
if (encoding.equals(PdfName.SHIFT_JIS))
return new String(b, "SJIS");
else if (encoding.equals(PdfName.UHC))
return new String(b, "MS949");
else if (encoding.equals(PdfName.GBK))
return new String(b, "GBK");
else if (encoding.equals(PdfName.BIGFIVE))
return new String(b, "Big5");
else if (encoding.equals(PdfName.UTF_8))
return new String(b, "UTF8");
}
catch (Exception e) {
}
return vs.toUnicodeString();
}
return null;
}
/** Gets the PDF file specification contained in the FDF.
* @return the PDF file specification contained in the FDF
*/
public String getFileSpec() {
return fileSpec;
}
}