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
TEST(CRC,StandardResults)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 unsigned char data[48] = {
34 0x01, 0xc0, 0x00, 0x00,
35 0x00, 0x00, 0x00, 0x00,
36 0x00, 0x00, 0x00, 0x00,
37 0x00, 0x00, 0x00, 0x00,
38 0x14, 0x00, 0x00, 0x00,
39 0x00, 0x00, 0x04, 0x00,
40 0x00, 0x00, 0x00, 0x14,
41 0x00, 0x00, 0x00, 0x18,
42 0x28, 0x00, 0x00, 0x00,
43 0x00, 0x00, 0x00, 0x00,
44 0x02, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x00, 0x00,
46 };
47 ASSERT_EQ(0xd9963a56, Value(reinterpret_cast<char*>(data), sizeof(data)));
48 }
49
TEST(CRC,Values)50 TEST(CRC, Values) {
51 ASSERT_NE(Value("a", 1), Value("foo", 3));
52 }
53
TEST(CRC,Extend)54 TEST(CRC, Extend) {
55 ASSERT_EQ(Value("hello world", 11),
56 Extend(Value("hello ", 6), "world", 5));
57 }
58
TEST(CRC,Mask)59 TEST(CRC, Mask) {
60 uint32_t crc = Value("foo", 3);
61 ASSERT_NE(crc, Mask(crc));
62 ASSERT_NE(crc, Mask(Mask(crc)));
63 ASSERT_EQ(crc, Unmask(Mask(crc)));
64 ASSERT_EQ(crc, Unmask(Unmask(Mask(Mask(crc)))));
65 }
66
67 } // namespace crc32c
68 } // namespace leveldb
69
main(int argc,char ** argv)70 int main(int argc, char** argv) {
71 return leveldb::test::RunAllTests();
72 }
73