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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;
     33 
     34 import org.jf.dexlib2.base.BaseTryBlock;
     35 import org.jf.dexlib2.dexbacked.raw.CodeItem;
     36 import org.jf.dexlib2.dexbacked.util.VariableSizeList;
     37 
     38 import javax.annotation.Nonnull;
     39 import java.util.List;
     40 
     41 public class DexBackedTryBlock extends BaseTryBlock<DexBackedExceptionHandler> {
     42     @Nonnull public final DexBackedDexFile dexFile;
     43     private final int tryItemOffset;
     44     private final int handlersStartOffset;
     45 
     46     public DexBackedTryBlock(@Nonnull DexBackedDexFile dexFile,
     47                              int tryItemOffset,
     48                              int handlersStartOffset) {
     49         this.dexFile = dexFile;
     50         this.tryItemOffset = tryItemOffset;
     51         this.handlersStartOffset = handlersStartOffset;
     52     }
     53 
     54     @Override public int getStartCodeAddress() {
     55         return dexFile.readSmallUint(tryItemOffset + CodeItem.TryItem.START_ADDRESS_OFFSET);
     56     }
     57 
     58     @Override public int getCodeUnitCount() {
     59         return dexFile.readUshort(tryItemOffset + CodeItem.TryItem.CODE_UNIT_COUNT_OFFSET);
     60     }
     61 
     62     @Nonnull
     63     @Override
     64     public List<? extends DexBackedExceptionHandler> getExceptionHandlers() {
     65         DexReader reader = dexFile.readerAt(
     66                 handlersStartOffset + dexFile.readUshort(tryItemOffset + CodeItem.TryItem.HANDLER_OFFSET));
     67         final int encodedSize = reader.readSleb128();
     68 
     69         if (encodedSize > 0) {
     70             //no catch-all
     71             return new VariableSizeList<DexBackedTypedExceptionHandler>(dexFile, reader.getOffset(), encodedSize) {
     72                 @Nonnull
     73                 @Override
     74                 protected DexBackedTypedExceptionHandler readNextItem(@Nonnull DexReader reader, int index) {
     75                     return new DexBackedTypedExceptionHandler(reader);
     76                 }
     77             };
     78         } else {
     79             //with catch-all
     80             final int sizeWithCatchAll = (-1 * encodedSize) + 1;
     81             return new VariableSizeList<DexBackedExceptionHandler>(dexFile, reader.getOffset(), sizeWithCatchAll) {
     82                 @Nonnull
     83                 @Override
     84                 protected DexBackedExceptionHandler readNextItem(@Nonnull DexReader dexReader, int index) {
     85                     if (index == sizeWithCatchAll-1) {
     86                         return new DexBackedCatchAllExceptionHandler(dexReader);
     87                     } else {
     88                         return new DexBackedTypedExceptionHandler(dexReader);
     89                     }
     90                 }
     91             };
     92         }
     93     }
     94 }
     95