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.instruction; 33 34import org.jf.dexlib2.Opcode; 35import org.jf.dexlib2.dexbacked.DexBackedDexFile; 36import org.jf.dexlib2.dexbacked.util.FixedSizeList; 37import org.jf.dexlib2.iface.instruction.SwitchElement; 38import org.jf.dexlib2.iface.instruction.formats.PackedSwitchPayload; 39 40import javax.annotation.Nonnull; 41import java.util.List; 42 43public class DexBackedPackedSwitchPayload extends DexBackedInstruction implements PackedSwitchPayload { 44 public final int elementCount; 45 46 private static final int ELEMENT_COUNT_OFFSET = 2; 47 private static final int FIRST_KEY_OFFSET = 4; 48 private static final int TARGETS_OFFSET = 8; 49 50 public DexBackedPackedSwitchPayload(@Nonnull DexBackedDexFile dexFile, 51 int instructionStart) { 52 super(dexFile, Opcode.PACKED_SWITCH_PAYLOAD, instructionStart); 53 54 elementCount = dexFile.readUshort(instructionStart + ELEMENT_COUNT_OFFSET); 55 } 56 57 @Nonnull 58 @Override 59 public List<? extends SwitchElement> getSwitchElements() { 60 final int firstKey = dexFile.readInt(instructionStart + FIRST_KEY_OFFSET); 61 return new FixedSizeList<SwitchElement>() { 62 @Nonnull 63 @Override 64 public SwitchElement readItem(final int index) { 65 return new SwitchElement() { 66 @Override 67 public int getKey() { 68 return firstKey + index; 69 } 70 71 @Override 72 public int getOffset() { 73 return dexFile.readInt(instructionStart + TARGETS_OFFSET + index*4); 74 } 75 }; 76 } 77 78 @Override public int size() { return elementCount; } 79 }; 80 } 81 82 @Override public int getCodeUnits() { return 4 + elementCount*2; } 83} 84