Package org.rabinfingerprint.polynomial

Examples of org.rabinfingerprint.polynomial.Polynomial.shiftLeft()

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  }

  private void precomputePopTable() {
    for (int i = 0; i < 256; i++) {
      Polynomial f = Polynomial.createFromLong(i);
      f = f.shiftLeft(BigInteger.valueOf(bytesPerWindow * 8));
      f = f.mod(poly);
      popTable[i] = f.toBigInteger().longValue();
    }
  }

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   * If we have passed overflowed our window, we pop a byte
   */
  @Override
  public synchronized void pushByte(byte b) {
    Polynomial f = fingerprint;
    f = f.shiftLeft(byteShift);
    f = f.or(Polynomial.createFromLong(b & 0xFFL));
    f = f.mod(poly);

    fingerprint = f;

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   * in a k-bit number at the end of the calculation.
   */
  public synchronized void popByte() {
    byte b = byteWindow.poll();
    Polynomial f = Polynomial.createFromLong(b & 0xFFL);
    f = f.shiftLeft(windowShift);
    f = f.mod(poly);

    fingerprint = fingerprint.xor(f);
  }

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   * {@link #pushByte} and {@link #popByte}
   */
  private void precomputePushTable() {
    for (int i = 0; i < 512; i++) {
      Polynomial f = Polynomial.createFromLong(i);
      f = f.shiftLeft(poly.degree());
      f = f.xor(f.mod(poly));
      pushTable[i] = f.toBigInteger().longValue();
    }
  }

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