/*
* Copyright 2008 Pirion Systems Pty Ltd, 139 Warry St,
* Fortitude Valley, Queensland, Australia
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.sun.pdfview.decrypt;
import com.sun.pdfview.PDFObject;
import com.sun.pdfview.PDFParseException;
import java.nio.ByteBuffer;
/**
* Performs identity decryption; that is, inputs aren't encrypted and
* are returned right back.
*
* @author Luke Kirby
*/
public class IdentityDecrypter implements PDFDecrypter {
private static IdentityDecrypter INSTANCE = new IdentityDecrypter();
public ByteBuffer decryptBuffer(String cryptFilterName,
PDFObject streamObj, ByteBuffer streamBuf)
throws PDFParseException {
if (cryptFilterName != null) {
throw new PDFParseException("This Encryption version does not support Crypt filters");
}
return streamBuf;
}
public String decryptString(int objNum, int objGen, String inputBasicString) {
return inputBasicString;
}
public static IdentityDecrypter getInstance() {
return INSTANCE;
}
public boolean isEncryptionPresent() {
return false;
}
public boolean isEncryptionPresent(String cryptFilterName) {
return false;
}
public boolean isOwnerAuthorised() {
return false;
}
}