1  // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
 2  // Use of this source code is governed by a BSD-style license that can be
 3  // found in the LICENSE file. See the AUTHORS file for names of contributors.
 4  
 5  #include "util/crc32c.h"
 6  #include "util/testharness.h"
 7  
 8  namespace leveldb {
 9  namespace crc32c {
10  
11  class CRC {};
12  
13  TEST(CRC, StandardResults) {
14    // From rfc3720 section B.4.
15    char buf[32];
16  
17    memset(buf, 0, sizeof(buf));
18    ASSERT_EQ(0x8a9136aa, Value(buf, sizeof(buf)));
19  
20    memset(buf, 0xff, sizeof(buf));
21    ASSERT_EQ(0x62a8ab43, Value(buf, sizeof(buf)));
22  
23    for (int i = 0; i < 32; i++) {
24      buf[i] = i;
25    }
26    ASSERT_EQ(0x46dd794e, Value(buf, sizeof(buf)));
27  
28    for (int i = 0; i < 32; i++) {
29      buf[i] = 31 - i;
30    }
31    ASSERT_EQ(0x113fdb5c, Value(buf, sizeof(buf)));
32  
33    uint8_t data[48] = {
34        0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
35        0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
36        0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00,
37        0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
38    };
39    ASSERT_EQ(0xd9963a56, Value(reinterpret_cast<char*>(data), sizeof(data)));
40  }
41  
42  TEST(CRC, Values) { ASSERT_NE(Value("a", 1), Value("foo", 3)); }
43  
44  TEST(CRC, Extend) {
45    ASSERT_EQ(Value("hello world", 11), Extend(Value("hello ", 6), "world", 5));
46  }
47  
48  TEST(CRC, Mask) {
49    uint32_t crc = Value("foo", 3);
50    ASSERT_NE(crc, Mask(crc));
51    ASSERT_NE(crc, Mask(Mask(crc)));
52    ASSERT_EQ(crc, Unmask(Mask(crc)));
53    ASSERT_EQ(crc, Unmask(Unmask(Mask(Mask(crc)))));
54  }
55  
56  }  // namespace crc32c
57  }  // namespace leveldb
58  
59  int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }