J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Portions Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * |
| 28 | * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| 29 | * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| 30 | */ |
| 31 | |
| 32 | package sun.security.krb5.internal.util; |
| 33 | |
| 34 | import java.io.BufferedInputStream; |
| 35 | import java.io.InputStream; |
| 36 | import java.io.IOException; |
| 37 | |
| 38 | /** |
| 39 | * This class implements a buffered input stream. It provides methods to read a chunck |
| 40 | * of data from underlying data stream. |
| 41 | * |
| 42 | * @author Yanni Zhang |
| 43 | * |
| 44 | */ |
| 45 | public class KrbDataInputStream extends BufferedInputStream{ |
| 46 | private boolean bigEndian = true; |
| 47 | |
| 48 | public void setNativeByteOrder() { |
| 49 | if (java.nio.ByteOrder.nativeOrder(). |
| 50 | equals(java.nio.ByteOrder.BIG_ENDIAN)) { |
| 51 | bigEndian = true; |
| 52 | } else { |
| 53 | bigEndian = false; |
| 54 | } |
| 55 | } |
| 56 | public KrbDataInputStream(InputStream is){ |
| 57 | super(is); |
| 58 | } |
| 59 | /** |
| 60 | * Reads up to the specific number of bytes from this input stream. |
| 61 | * @param num the number of bytes to be read. |
| 62 | * @return the int value of this byte array. |
| 63 | * @exception IOException. |
| 64 | */ |
| 65 | public int read(int num) throws IOException{ |
| 66 | byte[] bytes = new byte[num]; |
| 67 | read(bytes, 0, num); |
| 68 | int result = 0; |
| 69 | for (int i = 0; i < num; i++) { |
| 70 | if (bigEndian) { |
| 71 | result |= (bytes[i] & 0xff) << (num - i - 1) * 8; |
| 72 | } else { |
| 73 | result |= (bytes[i] & 0xff) << i * 8; |
| 74 | } |
| 75 | } |
| 76 | return result; |
| 77 | } |
| 78 | |
| 79 | public int readVersion() throws IOException { |
| 80 | // always read in big-endian mode |
| 81 | int result = (read() & 0xff) << 8; |
| 82 | return result | (read() & 0xff); |
| 83 | } |
| 84 | } |