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1   package org.apache.maven.surefire.util.internal;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  /**
23   * @author Kristian Rosenvold
24   */
25  public class ByteBuffer
26  {
27      private final byte[] data;
28  
29      private int position;
30  
31      public ByteBuffer( int length )
32      {
33          this.data = new byte[length];
34      }
35  
36      public ByteBuffer( byte[] buf, int off, int len )
37      {
38          this.data = new byte[len];
39          append( buf, off, len );
40      }
41  
42  
43      public void append( char chararcter )
44      {
45          data[position++] = (byte) chararcter;
46      }
47  
48      public void append( byte chararcter )
49      {
50          data[position++] = chararcter;
51      }
52  
53      private static final byte COMMA = (byte) ',';
54  
55      public void comma()
56      {
57          data[position++] = COMMA;
58      }
59  
60  
61      public void advance( int i )
62      { // Oooh nice break of encapsulation
63          position += i;
64      }
65  
66      public void append( Integer integer )
67      {
68          toHex( integer );
69      }
70  
71      /**
72       * Convert the integer to an unsigned number.
73       *
74       * @param i the value
75       */
76      private void toHex( int i )
77      {
78          byte[] buf = new byte[32];
79          int charPos = 32;
80          int radix = 1 << 4;
81          int mask = radix - 1;
82          do
83          {
84              buf[--charPos] = (byte) DIGITS[i & mask];
85              i >>>= 4;
86          }
87          while ( i != 0 );
88  
89          append( buf, charPos, ( 32 - charPos ) );
90      }
91  
92      private static final char[] DIGITS =
93          { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
94              'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
95  
96  
97      public byte[] getData()
98      {
99          return data;
100     }
101 
102     public int getlength()
103     {
104         return position;
105     }
106 
107     public String toString()
108     {
109         return new String( data, 0, position );
110     }
111 
112     public static byte[] copy( byte[] src1, int off1, int len1 )
113     {
114         byte[] combined = new byte[len1];
115         int pos = 0;
116         for ( int i = off1; i < off1 + len1; i++ )
117         {
118             combined[pos++] = src1[i];
119         }
120         return combined;
121     }
122 
123     void append( byte[] src1, int off1, int len1 )
124     {
125         for ( int i = off1; i < off1 + len1; i++ )
126         {
127             data[position++] = src1[i];
128         }
129     }
130 
131     public static byte[] join( byte[] src1, int off1, int len1, byte[] src2, int off2, int len2 )
132     {
133         byte[] combined = new byte[len1 + len2];
134         int pos = 0;
135         for ( int i = off1; i < off1 + len1; i++ )
136         {
137             combined[pos++] = src1[i];
138         }
139         for ( int i = off2; i < off2 + len2; i++ )
140         {
141             combined[pos++] = src2[i];
142         }
143         return combined;
144     }
145 
146 }