1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 * contributors may be used to endorse or promote products derived from
45 * this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59
60 package jdk.internal.org.objectweb.asm.commons;
61
62 import java.util.ArrayList;
63 import java.util.List;
64
65 import jdk.internal.org.objectweb.asm.Attribute;
66 import jdk.internal.org.objectweb.asm.ByteVector;
67 import jdk.internal.org.objectweb.asm.ClassReader;
68 import jdk.internal.org.objectweb.asm.ClassWriter;
69 import jdk.internal.org.objectweb.asm.Label;
70
71 /**
72 * ModuleHashes attribute.
73 * This attribute is specific to the OpenJDK and may change in the future.
74 *
75 * @author Remi Forax
76 */
77 public final class ModuleHashesAttribute extends Attribute {
78 public String algorithm;
79 public List<String> modules;
80 public List<byte[]> hashes;
81
82 /**
83 * Creates an attribute with a hashing algorithm, a list of module names,
84 * and a list of the same length of hashes.
85 * @param algorithm the hashing algorithm name.
86 * @param modules a list of module name
87 * @param hashes a list of hash, one for each module name.
88 */
89 public ModuleHashesAttribute(final String algorithm,
90 final List<String> modules, final List<byte[]> hashes) {
91 super("ModuleHashes");
92 this.algorithm = algorithm;
93 this.modules = modules;
94 this.hashes = hashes;
95 }
96
97 /**
98 * Creates an empty attribute that can be used as prototype
99 * to be passed as argument of the method
100 * {@link ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int)}.
101 */
102 public ModuleHashesAttribute() {
103 this(null, null, null);
104 }
105
106 @Override
107 protected Attribute read(ClassReader cr, int off, int len, char[] buf,
108 int codeOff, Label[] labels) {
109 String hashAlgorithm = cr.readUTF8(off, buf);
110
111 int count = cr.readUnsignedShort(off + 2);
112 ArrayList<String> modules = new ArrayList<String>(count);
113 ArrayList<byte[]> hashes = new ArrayList<byte[]>(count);
114 off += 4;
115
116 for (int i = 0; i < count; i++) {
117 String module = cr.readModule(off, buf);
118 int hashLength = cr.readUnsignedShort(off + 2);
119 off += 4;
120
121 byte[] hash = new byte[hashLength];
122 for (int j = 0; j < hashLength; j++) {
123 hash[j] = (byte) (cr.readByte(off + j) & 0xff);
124 }
125 off += hashLength;
126
127 modules.add(module);
128 hashes.add(hash);
129 }
130 return new ModuleHashesAttribute(hashAlgorithm, modules, hashes);
131 }
132
133 @Override
134 protected ByteVector write(ClassWriter cw, byte[] code, int len,
135 int maxStack, int maxLocals) {
136 ByteVector v = new ByteVector();
137 int index = cw.newUTF8(algorithm);
138 v.putShort(index);
139
140 int count = (modules == null)? 0: modules.size();
141 v.putShort(count);
142
143 for(int i = 0; i < count; i++) {
144 String module = modules.get(i);
145 v.putShort(cw.newModule(module));
146
147 byte[] hash = hashes.get(i);
148 v.putShort(hash.length);
149 for(byte b: hash) {
150 v.putByte(b);
151 }
152 }
153 return v;
154 }
155 }