01: /**
02: * YGuard -- an obfuscation library for Java(TM) classfiles.
03: *
04: * Original Copyright (c) 1999 Mark Welsh (markw@retrologic.com)
05: * Modifications Copyright (c) 2002 yWorks GmbH (yguard@yworks.com)
06: *
07: * This library is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU Lesser General Public
09: * License as published by the Free Software Foundation; either
10: * version 2 of the License, or (at your option) any later version.
11: *
12: * This library is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this library; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: *
21: * The author may be contacted at yguard@yworks.com
22: *
23: * Java and all Java-based marks are trademarks or registered
24: * trademarks of Sun Microsystems, Inc. in the U.S. and other countries.
25: */package com.yworks.yguard.obf.classfile;
26:
27: import java.io.*;
28: import java.util.*;
29:
30: /**
31: * Representation of an attribute.
32: *
33: * @author Mark Welsh
34: */
35: public class LocalVariableTableAttrInfo extends AttrInfo {
36: // Constants -------------------------------------------------------------
37:
38: // Fields ----------------------------------------------------------------
39: private int u2localVariableTableLength;
40: private LocalVariableInfo[] localVariableTable;
41:
42: // Class Methods ---------------------------------------------------------
43:
44: // Instance Methods ------------------------------------------------------
45: protected LocalVariableTableAttrInfo(ClassFile cf,
46: int attrNameIndex, int attrLength) {
47: super (cf, attrNameIndex, attrLength);
48: }
49:
50: /** Return the String name of the attribute; over-ride this in sub-classes. */
51: protected String getAttrName() {
52: return ATTR_LocalVariableTable;
53: }
54:
55: /** Return the array of local variable table entries. */
56: protected LocalVariableInfo[] getLocalVariableTable() {
57: return localVariableTable;
58: }
59:
60: public void setLocalVariableTable(LocalVariableInfo[] lvts) {
61: this .localVariableTable = lvts;
62: this .u2localVariableTableLength = lvts.length;
63: this .u4attrLength = 2 + 10 * u2localVariableTableLength;
64: }
65:
66: /** Check for Utf8 references in the 'info' data to the constant pool and mark them. */
67: protected void markUtf8RefsInInfo(ConstantPool pool) {
68: for (int i = 0; i < localVariableTable.length; i++) {
69: localVariableTable[i].markUtf8Refs(pool);
70: }
71: }
72:
73: /** Read the data following the header. */
74: protected void readInfo(DataInput din) throws java.io.IOException {
75: u2localVariableTableLength = din.readUnsignedShort();
76: localVariableTable = new LocalVariableInfo[u2localVariableTableLength];
77: for (int i = 0; i < u2localVariableTableLength; i++) {
78: localVariableTable[i] = LocalVariableInfo.create(din);
79: }
80: }
81:
82: /** Export data following the header to a DataOutput stream. */
83: public void writeInfo(DataOutput dout) throws java.io.IOException {
84: dout.writeShort(u2localVariableTableLength);
85: for (int i = 0; i < u2localVariableTableLength; i++) {
86: localVariableTable[i].write(dout);
87: }
88: }
89:
90: }
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