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J. Duke319a3b92007-12-01 00:00:00 +00001/*
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
32package sun.security.krb5.internal.util;
33
34import java.io.BufferedInputStream;
35import java.io.InputStream;
36import 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 */
45public 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}