Examples of java.util.zip.Checksum.update()

java.util.zip.Checksum.update()
Updates the current checksum with the specified byte. @param b the byte to update the checksum with

            if (buf == null || buf.length == 0) {
                throw new IOException("Faulty serialization for header " +
                        "and txn");
            }
            Checksum crc = makeChecksumAlgorithm();
            crc.update(buf, 0, buf.length);
            oa.writeLong(crc.getValue(), "txnEntryCRC");
            Util.writeTxnBytes(oa, buf);
            
            return true;
        }

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                if (bytes == null || bytes.length==0)
                   throw new EOFException("Failed to read");
                // EOF or corrupted record
                // validate CRC
                Checksum crc = makeChecksumAlgorithm();
                crc.update(bytes, 0, bytes.length);
                if (crcValue != crc.getValue())
                    throw new IOException(CRC_ERROR);
                if (bytes == null || bytes.length == 0)
                    return false;
                InputArchive iab = BinaryInputArchive

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  protected String getChecksum(String s) {
    byte[] bytes = s.getBytes();
     
      Checksum checksumEngine = new CRC32();
      checksumEngine.update(bytes, 0, bytes.length);
      long checksum = checksumEngine.getValue();
      return Long.toHexString(checksum);


  }

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              break;
            }
            fos.writeInt((int) bytesRead);
            if (useChecksum) {
              checksum.reset();
              checksum.update(buf, 0, (int) bytesRead);
              fos.writeLong(checksum.getValue());
            }
            fos.write(buf, 0, (int) bytesRead);
            fos.flush();
            if (indexVersion != null && (packetsWritten % 5 == 0)) {

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                        // writeUTF/writeWithShortLength) and 4 bytes for column count.
                        // This prevents CRC by being fooled by special-case garbage in the file; see CASSANDRA-2128
                        if (serializedSize < 10)
                            break;
                        long claimedSizeChecksum = reader.readLong();
                        checksum.update(serializedSize);
                        if (checksum.getValue() != claimedSizeChecksum)
                            break; // entry wasn't synced correctly/fully.  that's ok.


                        if (serializedSize > bytes.length)
                            bytes = new byte[(int) (1.2 * serializedSize)];

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                    catch(EOFException eof)
                    {
                        break; // last CL entry didn't get completely written.  that's ok.
                    }


                    checksum.update(bytes, 0, serializedSize);
                    if (claimedCRC32 != checksum.getValue())
                    {
                        // this entry must not have been fsynced.  probably the rest is bad too,
                        // but just in case there is no harm in trying them (since we still read on an entry boundary)
                        continue;

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      byte[] b = new byte[nBytes];
      rnd.nextBytes(b);
      javaChecksum.reset();
      jeChecksum.reset();
      javaChecksum.update(b, 0, nBytes);
      jeChecksum.update(b, 0, nBytes);
      assertEquals(javaChecksum.getValue(), jeChecksum.getValue());
  }
    }


    public void xtestRandomAdler32ByteArrayPerformance() {

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      javaChecksum.reset();
      jeChecksum.reset();
      for (int j = 0; j < nBytes; j++) {
    byte b = (byte) (rnd.nextInt(256) & 0xff);
    javaChecksum.update(b);
    jeChecksum.update(b);
      }
      assertEquals(javaChecksum.getValue(), jeChecksum.getValue());
  }
    }
}

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        /* Add the prev pointer */
        destBuffer.position(HEADER_PREV_OFFSET);
        LogUtils.writeUnsignedInt(destBuffer, lastOffset);


        /* Now calculate the checksum and write it into the buffer. */
        checksum.update(destBuffer.array(), CHECKSUM_BYTES,
                        (entrySize - CHECKSUM_BYTES));
        destBuffer.position(0);
        LogUtils.putUnsignedInt(destBuffer, checksum.getValue());


        /* Leave this buffer ready for copying into another buffer. */

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            byte data[] = new byte[size];
            reader.readFully(offset+BATCH_CONTROL_RECORD_SIZE, data);


            Checksum checksum = new Adler32();
            checksum.update(data, 0, data.length);


            if( expectedChecksum!=checksum.getValue() ) {
                return -1;
            }

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