package jxl.biff;

public final class IntegerHelper {
  public static int getInt(byte b1, byte b2) {
    int i1 = b1 & 0xFF;
    int i2 = b2 & 0xFF;
    int val = i2 << 8 | i1;
    return val;
  }
  
  public static short getShort(byte b1, byte b2) {
    short i1 = (short)(b1 & 0xFF);
    short i2 = (short)(b2 & 0xFF);
    short val = (short)(i2 << 8 | i1);
    return val;
  }
  
  public static int getInt(byte b1, byte b2, byte b3, byte b4) {
    int i1 = getInt(b1, b2);
    int i2 = getInt(b3, b4);
    int val = i2 << 16 | i1;
    return val;
  }
  
  public static byte[] getTwoBytes(int i) {
    byte[] bytes = new byte[2];
    bytes[0] = (byte)(i & 0xFF);
    bytes[1] = (byte)((i & 0xFF00) >> 8);
    return bytes;
  }
  
  public static byte[] getFourBytes(int i) {
    byte[] bytes = new byte[4];
    int i1 = i & 0xFFFF;
    int i2 = (i & 0xFFFF0000) >> 16;
    getTwoBytes(i1, bytes, 0);
    getTwoBytes(i2, bytes, 2);
    return bytes;
  }
  
  public static void getTwoBytes(int i, byte[] target, int pos) {
    target[pos] = (byte)(i & 0xFF);
    target[pos + 1] = (byte)((i & 0xFF00) >> 8);
  }
  
  public static void getFourBytes(int i, byte[] target, int pos) {
    byte[] bytes = getFourBytes(i);
    target[pos] = bytes[0];
    target[pos + 1] = bytes[1];
    target[pos + 2] = bytes[2];
    target[pos + 3] = bytes[3];
  }
}