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 32package org.jf.dexlib2.dexbacked; 33 34import org.jf.dexlib2.base.BaseTryBlock; 35import org.jf.dexlib2.dexbacked.raw.CodeItem; 36import org.jf.dexlib2.dexbacked.util.VariableSizeList; 37 38import javax.annotation.Nonnull; 39import java.util.List; 40 41public 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