1/********************************************************************
2 * Copyright (c) 2013 - 2014, Pivotal Inc.
3 * All rights reserved.
4 *
5 * Author: Zhanwei Wang
6 ********************************************************************/
7/********************************************************************
8 * 2014 -
9 * open source under Apache License Version 2.0
10 ********************************************************************/
11/**
12 * Licensed to the Apache Software Foundation (ASF) under one
13 * or more contributor license agreements. See the NOTICE file
14 * distributed with this work for additional information
15 * regarding copyright ownership. The ASF licenses this file
16 * to you under the Apache License, Version 2.0 (the
17 * "License"); you may not use this file except in compliance
18 * with the License. You may obtain a copy of the License at
19 *
20 * http://www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an "AS IS" BASIS,
24 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28#ifndef _HDFS_LIBHDFS3_COMMON_CHECKSUM_H_
29#define _HDFS_LIBHDFS3_COMMON_CHECKSUM_H_
30
31#include <stdint.h>
32
33#define CHECKSUM_TYPE_SIZE 1
34#define CHECKSUM_BYTES_PER_CHECKSUM_SIZE 4
35#define CHECKSUM_TYPE_CRC32C 2
36
37namespace Hdfs {
38namespace Internal {
39
40/**
41 * An abstract base CRC class.
42 */
43class Checksum {
44public:
45 /**
46 * @return Returns the current checksum value.
47 */
48 virtual uint32_t getValue() = 0;
49
50 /**
51 * Resets the checksum to its initial value.
52 */
53 virtual void reset() = 0;
54
55 /**
56 * Updates the current checksum with the specified array of bytes.
57 * @param b The buffer of data.
58 * @param len The buffer length.
59 */
60 virtual void update(const void * b, int len) = 0;
61
62 /**
63 * Destroy the instance.
64 */
65 virtual ~Checksum() {
66 }
67};
68
69}
70}
71
72#endif /* _HDFS_LIBHDFS3_COMMON_CHECKSUM_H_ */
73