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* Copyright 2012, Google Inc.
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* modification, are permitted provided that the following conditions are
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*
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* notice, this list of conditions and the following disclaimer.
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package org.jf.dexlib2.dexbacked.instruction;
import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.dexbacked.DexBackedDexFile;
import org.jf.dexlib2.dexbacked.util.FixedSizeList;
import org.jf.dexlib2.iface.instruction.formats.ArrayPayload;
import org.jf.util.ExceptionWithContext;
import javax.annotation.Nonnull;
import java.util.List;
public class DexBackedArrayPayload extends DexBackedInstruction implements ArrayPayload {
public static final Opcode OPCODE = Opcode.ARRAY_PAYLOAD;
public final int elementWidth;
public final int elementCount;
private static final int ELEMENT_WIDTH_OFFSET = 2;
private static final int ELEMENT_COUNT_OFFSET = 4;
private static final int ELEMENTS_OFFSET = 8;
public DexBackedArrayPayload(@Nonnull DexBackedDexFile dexFile,
int instructionStart) {
super(dexFile, OPCODE, instructionStart);
elementWidth = dexFile.readUshort(instructionStart + ELEMENT_WIDTH_OFFSET);
elementCount = dexFile.readSmallUint(instructionStart + ELEMENT_COUNT_OFFSET);
}
@Override public int getElementWidth() { return elementWidth; }
@Nonnull
@Override
public List<Number> getArrayElements() {
final int elementsStart = instructionStart + ELEMENTS_OFFSET;
abstract class ReturnedList extends FixedSizeList<Number> {
@Override public int size() { return elementCount; }
}
switch (elementWidth) {
case 1:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.readByte(elementsStart + index);
}
};
case 2:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.readShort(elementsStart + index*2);
}
};
case 4:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.readInt(elementsStart + index*4);
}
};
case 8:
return new ReturnedList() {
@Nonnull
@Override
public Number readItem(int index) {
return dexFile.readLong(elementsStart + index*8);
}
};
default:
throw new ExceptionWithContext("Invalid element width: %d", elementWidth);
}
}
@Override
public int getCodeUnits() {
return 4 + (elementWidth*elementCount + 1) / 2;
}
}