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

        markDirty(rowMutation, repPos);


        Checksum checksum = new PureJavaCrc32();
        byte[] serializedRow = rowMutation.getSerializedBuffer(MessagingService.version_);


        checksum.update(serializedRow.length);
        buffer.putInt(serializedRow.length);
        buffer.putLong(checksum.getValue());


        buffer.put(serializedRow);
        checksum.update(serializedRow, 0, serializedRow.length);

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        checksum.update(serializedRow.length);
        buffer.putInt(serializedRow.length);
        buffer.putLong(checksum.getValue());


        buffer.put(serializedRow);
        checksum.update(serializedRow, 0, serializedRow.length);
        buffer.putLong(checksum.getValue());


        if (buffer.remaining() >= 4)
        {
            // writes end of segment marker and rewinds back to position where it starts

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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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         * Now calculate the checksumVal and write it into the buffer.  Be sure
         * to set the field in this instance, for use later when printing or
         * debugging the header.
         */
        Checksum checksum = Adler32.makeChecksum();
        checksum.update(entryBuffer.array(),
                        entryBuffer.arrayOffset() + CHECKSUM_BYTES,
                        entryBuffer.limit() - CHECKSUM_BYTES);
        entryBuffer.position(0);
        checksumVal = checksum.getValue();
        LogUtils.writeUnsignedInt(entryBuffer, checksumVal);

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         * so don't just turn the whole buffer into an array to pass
         * into the checksum object.
         */
        Checksum checksum = Adler32.makeChecksum();
        int checksumSize = itemSize + (getSize() - CHECKSUM_BYTES);
        checksum.update(entryBuffer.array(),
                        entryTypePosition + entryBuffer.arrayOffset(),
                        checksumSize);
        entryBuffer.position(itemStart - getSize());
        checksumVal = checksum.getValue();
        LogUtils.writeUnsignedInt(entryBuffer, checksumVal);

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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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        markDirty(rowMutation, repPos);


        Checksum checksum = new PureJavaCrc32();
        byte[] serializedRow = rowMutation.getSerializedBuffer(MessagingService.version_);


        checksum.update(serializedRow.length);
        buffer.putInt(serializedRow.length);
        buffer.putLong(checksum.getValue());


        buffer.put(serializedRow);
        checksum.update(serializedRow, 0, serializedRow.length);

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        checksum.update(serializedRow.length);
        buffer.putInt(serializedRow.length);
        buffer.putLong(checksum.getValue());


        buffer.put(serializedRow);
        checksum.update(serializedRow, 0, serializedRow.length);
        buffer.putLong(checksum.getValue());


        if (buffer.remaining() >= 4)
        {
            // writes end of segment marker and rewinds back to position where it starts

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