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      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 {
     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