hashes_test.cc

/*
   Copyright 2021 Simon (psyomn) Symeonidis

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
#include "gtest/gtest.h"
#include "gmock/gmock.h"

#include "ds/hashes.h"

#include <vector>

std::vector<std::byte> sample_bytes_1(void);
std::vector<std::byte> sample_bytes_2(void);

std::vector<std::byte> sample_bytes_1(void) {
  return std::vector<std::byte>{
    std::byte(0x01),
    std::byte(0x02),
    std::byte(0x03),
    std::byte(0x04),
    std::byte(0x05),
  };
}

std::vector<std::byte> sample_bytes_2(void) {
  return std::vector<std::byte>{
    std::byte(0x01),
    std::byte(0x10),
    std::byte(0xaa),
    std::byte(0xbb),
    std::byte(0xcc),
    std::byte(0xff),
  };
}

TEST(hashes, djb2) {
  const auto bytes_1 = sample_bytes_1();
  const auto result_1 = psy::ds::djb2(bytes_1);
  EXPECT_NE(result_1, 0);
  EXPECT_EQ(result_1, 210588810932);

  const auto bytes_2 = sample_bytes_2();
  const auto result_2 = psy::ds::djb2(bytes_2);
  EXPECT_NE(result_2, result_1);
  EXPECT_EQ(result_2, 6949453571238);
}

TEST(hashes, sdbm) {
  const auto bytes_1 = sample_bytes_1();
  const auto result_1 = psy::ds::sdbm(bytes_1);
  const auto bytes_2 = sample_bytes_2();
  const auto result_2 = psy::ds::sdbm(bytes_2);
  EXPECT_NE(result_1, 0);
  EXPECT_EQ(result_1, 71598627968528387U);
  EXPECT_EQ(result_2, 12367020746941822611U);
  EXPECT_NE(result_1, result_2);
}

TEST(hashes, loselose) {
  const auto bytes_1 = sample_bytes_1();
  const auto result_1 = psy::ds::loselose(bytes_1);
  EXPECT_NE(result_1, 0);
  EXPECT_EQ(result_1, 15);
}

TEST(hashes, fletcher16) {
  {
    const auto bytes = std::vector<std::byte> { std::byte(1), std::byte(2) };
    const auto result = psy::ds::fletcher16(bytes);
    EXPECT_EQ(result, 0x0403);
  }

  {
    const auto bytes = std::vector<std::byte> {
      std::byte(10), std::byte(25), std::byte(32),
      std::byte(99), std::byte(100), std::byte(44),
    };
    const auto result = psy::ds::fletcher16(bytes);
    EXPECT_EQ(result, 0x5636);
  }
}

TEST(hashes, fletcher32) {
  {
    const auto bytes = sample_bytes_1();
    const auto result = psy::ds::fletcher32(bytes);
    EXPECT_EQ(result, 0x23000f);
  }
  {
    const auto bytes = sample_bytes_2();
    const auto result = psy::ds::fletcher32(bytes);
    EXPECT_EQ(result, 0x7c60341);
  }
}