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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  * Copyright (c) 2002 The Apache Software Foundation. All rights
5  * reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in
16  * the documentation and/or other materials provided with the
17  * distribution.
18  *
19  * 3. The end-user documentation included with the redistribution, if
20  * any, must include the following acknowlegement:
21  * "This product includes software developed by the
22  * Apache Software Foundation (http://www.apache.org/)."
23  * Alternately, this acknowlegement may appear in the software itself,
24  * if and wherever such third-party acknowlegements normally appear.
25  *
26  * 4. The names "Apache BSF", "Apache", and "Apache Software Foundation"
27  * must not be used to endorse or promote products derived from
28  * this software without prior written permission. For written
29  * permission, please contact apache@apache.org.
30  *
31  * 5. Products derived from this software may not be called "Apache"
32  * nor may "Apache" appear in their names without prior written
33  * permission of the Apache Group.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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43  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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47  * ====================================================================
48  *
49  * This software consists of voluntary contributions made by many individuals
50  * on behalf of the Apache Software Foundation and was originally created by
51  * Sanjiva Weerawarana and others at International Business Machines
52  * Corporation. For more information on the Apache Software Foundation,
53  * please see <http://www.apache.org/>.
54  */
55
56 package org.apache.bsf.util.event.generator;
57
58 /**
59  * Bytecode handling utilities
60  *
61  * Handle standard byte arrays as defined in Java VM and Class File
62  *
63  * 5 April 1999 - functions to append Class File byte subarrays
64  * into a Class File byte array
65  *
66  * @author Richard F. Boehme
67  *
68  */
69 public class Bytecode
70 {
71   // Constant Pool Item Codes
72 public static final byte C_Utf8 = 0x01; // 1
73 public static final byte C_Integer = 0x03; // 3
74 public static final byte C_Float = 0x04; // 4
75 public static final byte C_Long = 0x05; // 5
76 public static final byte C_Double = 0x06; // 6
77 public static final byte C_Class = 0x07; // 7
78 public static final byte C_String = 0x08; // 8
79 public static final byte C_FieldRef = 0x09; // 9
80 public static final byte C_MethodRef = 0x0A; // 10
81 public static final byte C_InterfaceMethodRef = 0x0B; // 11
82 public static final byte C_NameAndType = 0x0C; // 12
83
84 //public static byte[] addDouble(byte[] array,double value)
85 //{
86 // array = ByteUtility.addBytes(array,C_Double);
87 // array = ByteUtility.addBytes(array,value);
88 // return array;
89 //}
90
91   public static byte[] addClass(byte[] array,short value)
92   { return addRef(C_Class,array,value); }
93   public static byte[] addFieldRef(byte[] array,short value1,short value2)
94   { return addRef(C_FieldRef,array,value1,value2); }
95   public static byte[] addInteger(byte[] array,int value)
96   {
97     array = ByteUtility.addBytes(array,C_Integer);
98     array = ByteUtility.addBytes(array,value);
99     return array;
100   }
101   public static byte[] addInterfaceMethodRef(byte[] array,short value1,short value2)
102   { return addRef(C_InterfaceMethodRef,array,value1,value2); }
103 //public static byte[] addFloat(byte[] array,float value)
104 //{
105 // array = ByteUtility.addBytes(array,C_Float);
106 // array = ByteUtility.addBytes(array,value);
107 // return array;
108 //}
109
110   public static byte[] addLong(byte[] array,long value)
111   {
112     array = ByteUtility.addBytes(array,C_Long);
113     array = ByteUtility.addBytes(array,value);
114     return array;
115   }
116   public static byte[] addMethodRef(byte[] array,short value1,short value2)
117   { return addRef(C_MethodRef,array,value1,value2); }
118   public static byte[] addNameAndType(byte[] array,short value1,short value2)
119   { return addRef(C_NameAndType,array,value1,value2); }
120   public static byte[] addRef(byte refType,byte[] array,short value)
121   {
122     array = ByteUtility.addBytes(array,refType);
123     array = ByteUtility.addBytes(array,value);
124     return array;
125   }
126   // Generic Bytecode Methods
127 public static byte[] addRef(byte refType,byte[] array,short value1,short value2)
128   {
129     array = ByteUtility.addBytes(array,refType);
130     array = ByteUtility.addBytes(array,value1);
131     array = ByteUtility.addBytes(array,value2);
132     return array;
133   }
134   public static byte[] addString(byte[] array,short value)
135   { return addRef(C_String,array,value); }
136   // Constant Pool Item Methods
137 public static byte[] addUtf8(byte[] array,String JavaDoc value)
138   {
139     array = ByteUtility.addBytes(array,C_Utf8);
140     array = ByteUtility.addBytes(array,(short)value.length());
141     array = ByteUtility.addBytes(array,value);
142     return array;
143   }
144 }
145
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