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

                buff.reset();
                buff.skip(5+Journal.BATCH_CONTROL_RECORD_MAGIC.length);
                buff.writeInt(sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                if( journal.isChecksum() ) {
                  Checksum checksum = new Adler32();
                  checksum.update(sequence.getData(), sequence.getOffset()+Journal.BATCH_CONTROL_RECORD_SIZE, sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                  buff.writeLong(checksum.getValue());
                }


                // Now do the 1 big write.
                file.seek(wb.offset);

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                // factor in this case since we know
                // our write batches are going to much larger.
                Checksum checksum = new Adler32();
                for (PageWrite w : batch) {
                    try {
                        checksum.update(w.diskBound, 0, pageSize);
                    } catch (Throwable t) {
                        throw IOExceptionSupport.create(
                                "Cannot create recovery file. Reason: " + t, t);
                    }
                }

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                byte []data = new byte[pageSize];
                if( recoveryFile.read(data, 0, pageSize) != pageSize ) {
                    // Invalid recovery record, Could not fully read the data". Probably due to a partial write to the recovery buffer
                    return nextTxId;
                }
                checksum.update(data, 0, pageSize);
                batch.put(offset, data);
            }
        } catch (Exception e) {
            // If an error occurred it was cause the redo buffer was not full written out correctly.. so don't redo it. 
            // as the pages should still be consistent.

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    while (bytesLeft > 0) {
      // generate the checksum for one chunk
      checksum.reset();
      int count = Math.min(bytesLeft, bytesPerChecksum);
      checksum.update(indata, startOffset, count);


      // write the checksum value to the output buffer.
      int cksumValue = (int)checksum.getValue();
      outOffset = Bytes.putInt(outdata, outOffset, cksumValue);
      chunkNum++;

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      HFile.LOG.warn(msg);
      return false;   // cannot happen case, unable to verify checksum
    }
    // Extract the header and compute checksum for the header.
    ByteBuffer hdr = block.getBufferWithHeader();
    checksumObject.update(hdr.array(), hdr.arrayOffset(), hdrSize);


    int off = hdrSize;
    int consumed = hdrSize;
    int bytesLeft = block.getOnDiskDataSizeWithHeader() - off;
    int cksumOffset = block.getOnDiskDataSizeWithHeader();

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    // validate each chunk
    while (bytesLeft > 0) {
      int thisChunkSize = bytesPerChecksum - consumed;
      int count = Math.min(bytesLeft, thisChunkSize);
      checksumObject.update(data, off, count);


      int storedChecksum = Bytes.toInt(data, cksumOffset);
      if (storedChecksum != (int)checksumObject.getValue()) {
        String msg = "File " + path +
                     " Stored checksum value of " + storedChecksum +

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                    break;
                }


                ByteArrayInputStream bufIn = new ByteArrayInputStream(bytes);
                Checksum checksum = new CRC32();
                checksum.update(bytes, 0, bytes.length);
                if (claimedCRC32 != checksum.getValue())
                {
                    // this part of the log must not have been fsynced.  probably the rest is bad too,
                    // but just in case there is no harm in trying them.
                    continue;

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                    break;
                }


                ByteArrayInputStream bufIn = new ByteArrayInputStream(bytes);
                Checksum checksum = new CRC32();
                checksum.update(bytes, 0, bytes.length);
                if (claimedCRC32 != checksum.getValue())
                {
                    // this part of the log must not have been fsynced.  probably the rest is bad too,
                    // but just in case there is no harm in trying them.
                    continue;

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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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