public void update()

in src/main/java/org/apache/commons/codec/digest/PureJavaCrc32C.java [600:638]

• 31 lines of code
• 9 McCabe index (conditional complexity)

  public void update(final byte[] b, int off, int len) {
    int localCrc = crc;

    while(len > 7) {
      final int c0 =(b[off+0] ^ localCrc) & 0xff;
      final int c1 =(b[off+1] ^ (localCrc >>>= 8)) & 0xff;
      final int c2 =(b[off+2] ^ (localCrc >>>= 8)) & 0xff;
      final int c3 =(b[off+3] ^ (localCrc >>>= 8)) & 0xff;
      localCrc = (T[T8_7_START + c0] ^ T[T8_6_START + c1]) ^
                 (T[T8_5_START + c2] ^ T[T8_4_START + c3]);

      final int c4 = b[off+4] & 0xff;
      final int c5 = b[off+5] & 0xff;
      final int c6 = b[off+6] & 0xff;
      final int c7 = b[off+7] & 0xff;

      localCrc ^= (T[T8_3_START + c4] ^ T[T8_2_START + c5]) ^
                  (T[T8_1_START + c6] ^ T[T8_0_START + c7]);

      off += 8;
      len -= 8;
    }

    /* loop unroll - duff's device style */
    switch(len) {
      case 7: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 6: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 5: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 4: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 3: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 2: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      case 1: localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
      default:
        break; // satisfy Findbugs
    }

    // Publish crc out to object
    crc = localCrc;
  }