Android Open Source - RejsekortReader Data Type

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License

The source code is released under:

GNU General Public License

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Java Source Code

package info.rejsekort.reader.rkf.datatypes;
/*  ww  w .j  a  va  2  s . co  m*/
import java.math.BigInteger;

public abstract class DataType {
  /** The bits as a string of "0" and "1": "000110001..." */
  protected String mBits;
  protected boolean mReverse = true;
  public int mBitlength;
  
  public DataType(int bitlength, boolean reverse) {
    mReverse = reverse;
    mBitlength = bitlength;
  }
  
  public void fromBits(String bits) {
    mBits = bits;
    if (mReverse) {
      //reverse the bits
      mBits = new StringBuilder(bits).reverse().toString();
    }
    interpret();
  }
  
  abstract void interpret();
  
  public static byte[] hexStringToByteArray(String s) {
      int len = s.length();
      byte[] data = new byte[len / 2];
      for (int i = 0; i < len; i += 2) {
          data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                               + Character.digit(s.charAt(i+1), 16));
      }
      return data;
  }
  
  public static String getHexString(byte[] buf) {
    StringBuffer sb = new StringBuffer();

    for (byte b : buf) {
      sb.append(String.format("%02x", b));
    }

    return sb.toString();
  }
  
  public static String getBinaryString(byte[] input){
      StringBuilder sb = new StringBuilder();

      for (byte c : input) {
          for (int n =  128; n > 0; n >>= 1){
              if ((c & n) == 0)
                  sb.append('0');
              else sb.append('1');
          }
      }

      return sb.toString();
  }
  
  public static byte[] binaryStringToByteArray(String s) {
    byte[] ret = new byte[(s.length()+8-1) / 8];

    BigInteger bigint = new BigInteger(s, 2);
    byte[] bigintbytes = bigint.toByteArray();
    
    if (bigintbytes.length > ret.length) {
      //get rid of preceding 0
      for (int i = 0; i < ret.length; i++) {
        ret[i] = bigintbytes[i+1];
      }
    }
    else {
      ret = bigintbytes;
    }
    return ret;
  }
}

Java Source Code List