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 (serializedRow instanceof DataOutputBuffer)
                {
                    DataOutputBuffer buffer = (DataOutputBuffer) serializedRow;
                    logWriter_.writeLong(buffer.getLength());
                    logWriter_.write(buffer.getData(), 0, buffer.getLength());
                    checkum.update(buffer.getData(), 0, buffer.getLength());
                }
                else
                {
                    assert serializedRow instanceof byte[];
                    byte[] bytes = (byte[]) serializedRow;

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                {
                    assert serializedRow instanceof byte[];
                    byte[] bytes = (byte[]) serializedRow;
                    logWriter_.writeLong(bytes.length);
                    logWriter_.write(bytes);
                    checkum.update(bytes, 0, bytes.length);
                }
                logWriter_.writeLong(checkum.getValue());
                maybeRollLog();
                return cLogCtx;
            }

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                    // last CL entry didn't get completely written.  that's ok.
                    break;
                }
                bufIn.reset(bytes, bytes.length);
                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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            ReplayPosition cLogCtx = new ReplayPosition(id, (int) currentPosition);


            // write mutation, w/ checksum on the size and data
            Checksum checksum = new CRC32();
            byte[] serializedRow = rowMutation.getSerializedBuffer(MessagingService.version_);
            checksum.update(serializedRow.length);
            logWriter.writeInt(serializedRow.length);
            logWriter.writeLong(checksum.getValue());
            logWriter.write(serializedRow);
            checksum.update(serializedRow, 0, serializedRow.length);
            logWriter.writeLong(checksum.getValue());

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            byte[] serializedRow = rowMutation.getSerializedBuffer(MessagingService.version_);
            checksum.update(serializedRow.length);
            logWriter.writeInt(serializedRow.length);
            logWriter.writeLong(checksum.getValue());
            logWriter.write(serializedRow);
            checksum.update(serializedRow, 0, serializedRow.length);
            logWriter.writeLong(checksum.getValue());


            return cLogCtx;
        }
        catch (IOException e)

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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 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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            recoveryFile.seek(RECOVERY_FILE_HEADER_SIZE);
        }
        for (PageWrite w : batch) {
            if (enableRecoveryFile) {
                try {
                    checksum.update(w.getDiskBound(), 0, pageSize);
                } catch (Throwable t) {
                    throw IOExceptionSupport.create("Cannot create recovery file. Reason: " + t, t);
                }
                recoveryFile.writeLong(w.page.getPageId());
                recoveryFile.write(w.getDiskBound(), 0, pageSize);

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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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