/*
* [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.Opcode;
import org.jf.dexlib.DexFile;
import org.jf.dexlib.Util.AnnotatedOutput;
import org.jf.dexlib.Util.NumberUtils;
import java.util.Iterator;
public class ArrayDataPseudoInstruction extends Instruction {
public static final Instruction.InstructionFactory Factory = new Factory();
private int elementWidth;
private byte[] encodedValues;
@Override
public int getSize(int codeAddress) {
return ((encodedValues.length + 1)/2) + 4 + (codeAddress % 2);
}
public ArrayDataPseudoInstruction(int elementWidth, byte[] encodedValues) {
super(Opcode.NOP);
if (encodedValues.length % elementWidth != 0) {
throw new RuntimeException("There are not a whole number of " + elementWidth + " byte elements");
}
this.elementWidth = elementWidth;
this.encodedValues = encodedValues;
}
public ArrayDataPseudoInstruction(byte[] buffer, int bufferIndex) {
super(Opcode.NOP);
byte opcodeByte = buffer[bufferIndex];
if (opcodeByte != 0x00) {
throw new RuntimeException("Invalid opcode byte for an ArrayData pseudo-instruction");
}
byte subopcodeByte = buffer[bufferIndex+1];
if (subopcodeByte != 0x03) {
throw new RuntimeException("Invalid sub-opcode byte for an ArrayData pseudo-instruction");
}
this.elementWidth = NumberUtils.decodeUnsignedShort(buffer, bufferIndex+2);
int elementCount = NumberUtils.decodeInt(buffer, bufferIndex+4);
this.encodedValues = new byte[elementCount * elementWidth];
System.arraycopy(buffer, bufferIndex+8, encodedValues, 0, elementCount * elementWidth);
}
protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
out.alignTo(4);
int elementCount = encodedValues.length / elementWidth;
out.writeByte(0x00);
out.writeByte(0x03);
out.writeShort(elementWidth);
out.writeInt(elementCount);
out.write(encodedValues);
//make sure we're written out an even number of bytes
out.alignTo(2);
}
protected void annotateInstruction(AnnotatedOutput out, int currentCodeAddress) {
out.annotate(getSize(currentCodeAddress)*2, "[0x" + Integer.toHexString(currentCodeAddress) + "] " +
"fill-array-data instruction");
}
public Format getFormat() {
return Format.ArrayData;
}
public int getElementWidth() {
return elementWidth;
}
public int getElementCount() {
return encodedValues.length / elementWidth;
}
public static class ArrayElement {
public final byte[] buffer;
public int bufferIndex;
public final int elementWidth;
public ArrayElement(byte[] buffer, int elementWidth) {
this.buffer = buffer;
this.elementWidth = elementWidth;
}
}
public Iterator<ArrayElement> getElements() {
return new Iterator<ArrayElement>() {
final int elementCount = getElementCount();
int i=0;
int position=0;
final ArrayElement arrayElement = new ArrayElement(encodedValues, getElementWidth());
public boolean hasNext() {
return i<elementCount;
}
public ArrayElement next() {
arrayElement.bufferIndex = position;
position += arrayElement.elementWidth;
i++;
return arrayElement;
}
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 an ArrayDataPseudoInstruction must be NOP");
}
return new ArrayDataPseudoInstruction(buffer, bufferIndex);
}
}
}