content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package com.aliyun.odps.tunnel.io;
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  
  import org.xerial.snappy.PureJavaCrc32C;
  
  /**
   * CRC32 checksum util
   */
  public class Checksum {
  
    private static byte[] TRUE = {1};
    private static byte[] FALSE = {0};
  
    private PureJavaCrc32C crc = new PureJavaCrc32C();
    private ByteBuffer buf;
  
    public Checksum() {
      buf = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);
    }
  
    public void update(int v) {
      buf.clear();
      buf.putInt(v);
      crc.update(buf.array(), 0, 4);
    }
  
    public void update(long v) {
      buf.clear();
      buf.putLong(v);
      crc.update(buf.array(), 0, 8);
    }
  
    public void update(double v) {
      buf.clear();
      buf.putDouble(v);
      crc.update(buf.array(), 0, 8);
    }
  
    public void update(float v) {
      buf.clear();
      buf.putFloat(v);
      crc.update(buf.array(), 0, 4);
    }
  
    public void update(boolean v) {
      crc.update(v ? TRUE : FALSE, 0, 1);
    }
  
    public void update(byte[] b, int off, int len) {
      crc.update(b, off, len);
    }
  
    public long getValue() {
      return crc.getValue();
    }
  
    public void reset() {
      crc.reset();
    }
  
  }
  