Examples of java.util.zip.CRC32.update()

java.util.zip.CRC32.update()
Updates CRC-32 with specified byte.

      if (i == (numBlocks-1)) {
        b = new byte[(int)blocksize/2]; 
      }
      rand.nextBytes(b);
      stm.write(b);
      crc.update(b);
    }
    
    stm.close();
    return crc.getValue();
  }

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    while (num >= 0) {
      num = stm.read(b);
      if (num < 0) {
        break;
      }
      newcrc.update(b, 0, num);
    }
    stm.close();
    if (newcrc.getValue() != crc) {
      fail("CRC mismatch of files " + name1 + " with file " + name2);
    }

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    // fill random data into file
    final byte[] b = new byte[(int)blocksize];
    for (int i = 0; i < numBlocks; i++) {
      rand.nextBytes(b);
      stm.write(b);
      crc.update(b);
    }
    stm.close();
    return crc.getValue();
  }

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    // Write whole blocks.
    byte[] b = new byte[(int)blocksize];
    for (int i = 1; i < numBlocks; i++) {
      rand.nextBytes(b);
      stm.write(b);
      crc.update(b);
    }
    // Write partial block.
    b = new byte[(int)blocksize/2 - 1];
    rand.nextBytes(b);
    stm.write(b);

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    }
    // Write partial block.
    b = new byte[(int)blocksize/2 - 1];
    rand.nextBytes(b);
    stm.write(b);
    crc.update(b);


    stm.close();
    return crc.getValue();
  }
  //

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      num = stm.read(b);
      if (num < 0) {
        break;
      }
      numRead += num;
      newcrc.update(b, 0, num);
    }
    stm.close();


    if (numRead != length) {
      LOG.info("Number of bytes read " + numRead +

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    @Test
    public void testRecoveryWithBadSizeChecksum() throws Exception
    {
        Checksum checksum = new CRC32();
        checksum.update(100);
        testRecoveryWithBadSizeArgument(100, 100, ~checksum.getValue());
    }
    
    @Test
    public void testRecoveryWithZeroSegmentSizeArgument() throws Exception

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    }


    protected void testRecoveryWithBadSizeArgument(int size, int dataSize) throws Exception
    {
        Checksum checksum = new CRC32();
        checksum.update(size);
        testRecoveryWithBadSizeArgument(size, dataSize, checksum.getValue());
    }


    protected void testRecoveryWithBadSizeArgument(int size, int dataSize, long checksum) throws Exception
    {

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                        // 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.reset();
                        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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