content: /*
   * [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);
          }
      }
  }
  