src/leveldb/util/crc32c_test.cc

   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   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
  50 TEST(CRC, Values) {
  51   ASSERT_NE(Value("a", 1), Value("foo", 3));
  52 }
  53
  54 TEST(CRC, Extend) {
  55   ASSERT_EQ(Value("hello world", 11),
  56             Extend(Value("hello ", 6), "world", 5));
  57 }
  58
  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
  70 int main(int argc, char** argv) {
  71   return leveldb::test::RunAllTests();
  72 }