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

        {
            Checksum checksum = new CRC32();


            // write the first checksum after the fixed-size part, so we won't read garbage lastFlushedAt data.
            dos.writeInt(clHeader.cfDirtiedAt.size()); // 4
            checksum.update(clHeader.cfDirtiedAt.size());
            dos.writeLong(checksum.getValue());


            // write the 2nd checksum after the lastflushedat map
            for (Map.Entry<Integer, Integer> entry : clHeader.cfDirtiedAt.entrySet())
            {

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            // write the 2nd checksum after the lastflushedat map
            for (Map.Entry<Integer, Integer> entry : clHeader.cfDirtiedAt.entrySet())
            {
                dos.writeInt(entry.getKey()); // 4
                checksum.update(entry.getKey());
                dos.writeInt(entry.getValue()); // 4
                checksum.update(entry.getValue());
            }
            dos.writeLong(checksum.getValue());
        }

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            for (Map.Entry<Integer, Integer> entry : clHeader.cfDirtiedAt.entrySet())
            {
                dos.writeInt(entry.getKey()); // 4
                checksum.update(entry.getKey());
                dos.writeInt(entry.getValue()); // 4
                checksum.update(entry.getValue());
            }
            dos.writeLong(checksum.getValue());
        }


        public CommitLogHeader deserialize(DataInput dis) throws IOException

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        public CommitLogHeader deserialize(DataInput dis) throws IOException
        {
            Checksum checksum = new CRC32();


            int lastFlushedAtSize = dis.readInt();
            checksum.update(lastFlushedAtSize);
            if (checksum.getValue() != dis.readLong())
            {
                throw new IOException("Invalid or corrupt commitlog header");
            }
            Map<Integer, Integer> lastFlushedAt = new HashMap<Integer, Integer>();

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            }
            Map<Integer, Integer> lastFlushedAt = new HashMap<Integer, Integer>();
            for (int i = 0; i < lastFlushedAtSize; i++)
            {
                int key = dis.readInt();
                checksum.update(key);
                int value = dis.readInt();
                checksum.update(value);
                lastFlushedAt.put(key, value);
            }
            if (checksum.getValue() != dis.readLong())

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            for (int i = 0; i < lastFlushedAtSize; i++)
            {
                int key = dis.readInt();
                checksum.update(key);
                int value = dis.readInt();
                checksum.update(value);
                lastFlushedAt.put(key, value);
            }
            if (checksum.getValue() != dis.readLong())
            {
                throw new IOException("Invalid or corrupt commitlog header");

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            {
                assert serializedRow instanceof byte[];
                bytes = (byte[]) serializedRow;
            }


            checksum.update(bytes.length);
            logWriter.writeInt(bytes.length);
            logWriter.writeLong(checksum.getValue());
            logWriter.write(bytes);
            checksum.update(bytes, 0, bytes.length);
            logWriter.writeLong(checksum.getValue());

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            checksum.update(bytes.length);
            logWriter.writeInt(bytes.length);
            logWriter.writeLong(checksum.getValue());
            logWriter.write(bytes);
            checksum.update(bytes, 0, bytes.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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