/*
* [The "BSD licence"]
* Copyright (c) 2010 Ben Gruver (JesusFreke)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib.Code.Format;
import org.jf.dexlib.Code.Instruction;
import org.jf.dexlib.Code.MultiOffsetInstruction;
import org.jf.dexlib.Code.Opcode;
import org.jf.dexlib.DexFile;
import org.jf.dexlib.Util.AnnotatedOutput;
import org.jf.dexlib.Util.NumberUtils;
import java.util.Iterator;
public class PackedSwitchDataPseudoInstruction extends Instruction implements MultiOffsetInstruction {
public static final Instruction.InstructionFactory Factory = new Factory();
private int firstKey;
private int[] targets;
@Override
public int getSize(int codeAddress) {
return getTargetCount() * 2 + 4 + (codeAddress % 2);
}
public PackedSwitchDataPseudoInstruction(int firstKey, int[] targets) {
super(Opcode.NOP);
if (targets.length > 0xFFFF) {
throw new RuntimeException("The packed-switch data contains too many elements. " +
"The maximum number of switch elements is 65535");
}
this.firstKey = firstKey;
this.targets = targets;
}
public PackedSwitchDataPseudoInstruction(byte[] buffer, int bufferIndex) {
super(Opcode.NOP);
byte opcodeByte = buffer[bufferIndex];
if (opcodeByte != 0x00) {
throw new RuntimeException("Invalid opcode byte for a PackedSwitchData pseudo-instruction");
}
byte subopcodeByte = buffer[bufferIndex+1];
if (subopcodeByte != 0x01) {
throw new RuntimeException("Invalid sub-opcode byte for a PackedSwitchData pseudo-instruction");
}
int targetCount = NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 2);
this.firstKey = NumberUtils.decodeInt(buffer, bufferIndex + 4);
this.targets = new int[targetCount];
for (int i = 0; i<targetCount; i++) {
targets[i] = NumberUtils.decodeInt(buffer, bufferIndex + 8 + 4*i);
}
}
protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
out.alignTo(4);
out.writeByte(0x00);
out.writeByte(0x01);
out.writeShort(targets.length);
out.writeInt(firstKey);
for (int target : targets) {
out.writeInt(target);
}
}
protected void annotateInstruction(AnnotatedOutput out, int currentCodeAddress) {
out.annotate(getSize(currentCodeAddress)*2, "[0x" + Integer.toHexString(currentCodeAddress) + "] " +
"packed-switch-data instruction");
}
public void updateTarget(int targetIndex, int targetAddressOffset) {
targets[targetIndex] = targetAddressOffset;
}
public Format getFormat() {
return Format.PackedSwitchData;
}
public int getTargetCount() {
return targets.length;
}
public int getFirstKey() {
return firstKey;
}
public int[] getTargets() {
return targets;
}
public static class PackedSwitchTarget {
public int value;
public int targetAddressOffset;
}
public Iterator<PackedSwitchTarget> iterateKeysAndTargets() {
return new Iterator<PackedSwitchTarget>() {
final int targetCount = getTargetCount();
int i = 0;
int value = getFirstKey();
PackedSwitchTarget packedSwitchTarget = new PackedSwitchTarget();
public boolean hasNext() {
return i<targetCount;
}
public PackedSwitchTarget next() {
packedSwitchTarget.value = value++;
packedSwitchTarget.targetAddressOffset = targets[i];
i++;
return packedSwitchTarget;
}
public void remove() {
}
};
}
private static class Factory implements Instruction.InstructionFactory {
public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
if (opcode != Opcode.NOP) {
throw new RuntimeException("The opcode for a PackedSwitchDataPseudoInstruction must be NOP");
}
return new PackedSwitchDataPseudoInstruction(buffer, bufferIndex);
}
}
}