content: package edu.cmu.hcii.whyline.bytecode;
  
  /**
   * @author Andrew J. Ko
   *
   */ 
  public final class ByteArray {
  
  	// Reads an unsigned 16bit integer at the index.
      public static int readU16bit(byte[] code, int index) {
          return ((code[index] & 0xff) << 8) | (code[index + 1] & 0xff);
      }
  
      // Reads a signed 16bit integer at the index.
      public static int readS16bit(byte[] code, int index) {
          return (code[index] << 8) | (code[index + 1] & 0xff);
      }
  
      // Writes a 16bit integer at the index.
      public static void write16bit(int value, byte[] code, int index) {
          code[index] = (byte)(value >>> 8);
          code[index + 1] = (byte)value;
      }
  
      // Reads a 32bit integer at the index.
      public static int read32bit(byte[] code, int index) {
          return (code[index] << 24) | ((code[index + 1] & 0xff) << 16)
                 | ((code[index + 2] & 0xff) << 8) | (code[index + 3] & 0xff);
      }
  
      // Writes a 32bit integer at the index.
      public static void write32bit(int value, byte[] code, int index) {
          code[index] = (byte)(value >>> 24);
          code[index + 1] = (byte)(value >>> 16);
          code[index + 2] = (byte)(value >>> 8);
          code[index + 3] = (byte)value;
      }
  
      // Copies a 32bit integer.
      static void copy32bit(byte[] src, int isrc, byte[] dest, int idest) {
          dest[idest] = src[isrc];
          dest[idest + 1] = src[isrc + 1];
          dest[idest + 2] = src[isrc + 2];
          dest[idest + 3] = src[isrc + 3];
      }
  
  }
  