1 /*
2  * Copyright 2015, Google Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * Redistributions in binary form must reproduce the above
12  * copyright notice, this list of conditions and the following disclaimer
13  * in the documentation and/or other materials provided with the
14  * distribution.
15  * Neither the name of Google Inc. nor the names of its
16  * contributors may be used to endorse or promote products derived from
17  * this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 package org.jf.dexlib2.analysis;
33 
34 import org.jf.dexlib2.AccessFlags;
35 import org.jf.dexlib2.analysis.util.TypeProtoUtils;
36 import org.jf.dexlib2.iface.ClassDef;
37 import org.jf.dexlib2.iface.Method;
38 import org.jf.dexlib2.util.MethodUtil;
39 import org.jf.dexlib2.util.TypeUtils;
40 
41 import javax.annotation.Nonnull;
42 
43 public class AnalyzedMethodUtil {
canAccess(@onnull TypeProto type, @Nonnull Method virtualMethod, boolean checkPackagePrivate, boolean checkProtected, boolean checkClass)44     public static boolean canAccess(@Nonnull TypeProto type, @Nonnull Method virtualMethod, boolean checkPackagePrivate,
45                                     boolean checkProtected, boolean checkClass) {
46         if (checkPackagePrivate && MethodUtil.isPackagePrivate(virtualMethod)) {
47             String otherPackage = TypeUtils.getPackage(virtualMethod.getDefiningClass());
48             String thisPackage = TypeUtils.getPackage(type.getType());
49             if (!otherPackage.equals(thisPackage)) {
50                 return false;
51             }
52         }
53 
54         if (checkProtected && (virtualMethod.getAccessFlags() & AccessFlags.PROTECTED.getValue()) != 0) {
55             if (!TypeProtoUtils.extendsFrom(type, virtualMethod.getDefiningClass())) {
56                 return false;
57             }
58         }
59 
60         if (checkClass) {
61             ClassPath classPath = type.getClassPath();
62             ClassDef methodClassDef = classPath.getClassDef(virtualMethod.getDefiningClass());
63             if (!TypeUtils.canAccessClass(type.getType(), methodClassDef)) {
64                 return false;
65             }
66         }
67 
68         return true;
69     }
70 }
71