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      1 /*
      2  * Copyright 2012, 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.dexbacked.value;
     33 
     34 import org.jf.dexlib2.base.value.BaseAnnotationEncodedValue;
     35 import org.jf.dexlib2.dexbacked.DexBackedAnnotationElement;
     36 import org.jf.dexlib2.dexbacked.DexBackedDexFile;
     37 import org.jf.dexlib2.dexbacked.DexReader;
     38 import org.jf.dexlib2.dexbacked.util.VariableSizeSet;
     39 import org.jf.dexlib2.iface.value.AnnotationEncodedValue;
     40 
     41 import javax.annotation.Nonnull;
     42 import java.util.Set;
     43 
     44 public class DexBackedAnnotationEncodedValue extends BaseAnnotationEncodedValue implements AnnotationEncodedValue {
     45     @Nonnull public final DexBackedDexFile dexFile;
     46     @Nonnull public final String type;
     47     private final int elementCount;
     48     private final int elementsOffset;
     49 
     50     public DexBackedAnnotationEncodedValue(@Nonnull DexReader reader) {
     51         this.dexFile = reader.dexBuf;
     52         this.type = dexFile.getType(reader.readSmallUleb128());
     53         this.elementCount = reader.readSmallUleb128();
     54         this.elementsOffset = reader.getOffset();
     55         skipElements(reader, elementCount);
     56     }
     57 
     58     public static void skipFrom(@Nonnull DexReader reader) {
     59         reader.skipUleb128(); // type
     60         int elementCount = reader.readSmallUleb128();
     61         skipElements(reader, elementCount);
     62     }
     63 
     64     private static void skipElements(@Nonnull DexReader reader, int elementCount) {
     65         for (int i=0; i<elementCount; i++) {
     66             reader.skipUleb128();
     67             DexBackedEncodedValue.skipFrom(reader);
     68         }
     69     }
     70 
     71     @Nonnull @Override public String getType() { return type; }
     72 
     73     @Nonnull
     74     @Override
     75     public Set<? extends DexBackedAnnotationElement> getElements() {
     76         return new VariableSizeSet<DexBackedAnnotationElement>(dexFile, elementsOffset, elementCount) {
     77             @Nonnull
     78             @Override
     79             protected DexBackedAnnotationElement readNextItem(@Nonnull DexReader dexReader, int index) {
     80                 return new DexBackedAnnotationElement(dexReader);
     81             }
     82         };
     83     }
     84 }
     85