crc32c_test.cc raw

   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(); }
  60