1 | /* |
2 | * @(#) $Id: ByteBufferHexDumper.java 327113 2005-10-21 06:59:15Z trustin $ |
3 | * |
4 | * Copyright 2004 The Apache Software Foundation |
5 | * |
6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
7 | * you may not use this file except in compliance with the License. |
8 | * You may obtain a copy of the License at |
9 | * |
10 | * http://www.apache.org/licenses/LICENSE-2.0 |
11 | * |
12 | * Unless required by applicable law or agreed to in writing, software |
13 | * distributed under the License is distributed on an "AS IS" BASIS, |
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
15 | * See the License for the specific language governing permissions and |
16 | * limitations under the License. |
17 | * |
18 | */ |
19 | package org.apache.mina.common; |
20 | |
21 | import org.apache.mina.common.ByteBuffer; |
22 | |
23 | /** |
24 | * Provides utility methods for ByteBuffers. |
25 | * |
26 | * @author The Apache Directory Project (dev@directory.apache.org) |
27 | * @version $Rev: 327113 $, $Date: 2005-10-21 15:59:15 +0900 $ |
28 | */ |
29 | class ByteBufferHexDumper |
30 | { |
31 | private static final byte[] highDigits; |
32 | |
33 | private static final byte[] lowDigits; |
34 | |
35 | // initialize lookup tables |
36 | static |
37 | { |
38 | final byte[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', |
39 | '9', 'A', 'B', 'C', 'D', 'E', 'F' }; |
40 | |
41 | int i; |
42 | byte[] high = new byte[ 256 ]; |
43 | byte[] low = new byte[ 256 ]; |
44 | |
45 | for( i = 0; i < 256; i++ ) |
46 | { |
47 | high[ i ] = digits[ i >>> 4 ]; |
48 | low[ i ] = digits[ i & 0x0F ]; |
49 | } |
50 | |
51 | highDigits = high; |
52 | lowDigits = low; |
53 | } |
54 | |
55 | static String getHexdump( ByteBuffer in ) |
56 | { |
57 | int size = in.remaining(); |
58 | |
59 | if( size == 0 ) |
60 | { |
61 | return "empty"; |
62 | } |
63 | |
64 | StringBuffer out = new StringBuffer( ( in.remaining() * 3 ) - 1 ); |
65 | |
66 | int mark = in.position(); |
67 | |
68 | // fill the first |
69 | int byteValue = in.get() & 0xFF; |
70 | out.append( ( char ) highDigits[ byteValue ] ); |
71 | out.append( ( char ) lowDigits[ byteValue ] ); |
72 | size--; |
73 | |
74 | // and the others, too |
75 | for( ; size > 0; size-- ) |
76 | { |
77 | out.append( ' ' ); |
78 | byteValue = in.get() & 0xFF; |
79 | out.append( ( char ) highDigits[ byteValue ] ); |
80 | out.append( ( char ) lowDigits[ byteValue ] ); |
81 | } |
82 | |
83 | in.position( mark ); |
84 | |
85 | return out.toString(); |
86 | } |
87 | } |