Function TestZigZag

cpp/src/arrow/util/bit_util_test.cc:936–947

}

static void TestZigZag(int32_t v, std::array<uint8_t, 5> buffer_expect) {
  uint8_t buffer[bit_util::kMaxLEB128ByteLenFor<int32_t>] = {};
  bit_util::BitWriter writer(buffer, sizeof(buffer));
  writer.PutZigZagVlqInt(v);
  // WARNING: The reader reads and caches the input when created, so it must be created
  // after the data is written in the buffer.
  bit_util::BitReader reader(buffer, sizeof(buffer));
  EXPECT_THAT(buffer, testing::ElementsAreArray(buffer_expect));
  int32_t result;
  EXPECT_TRUE(reader.GetZigZagVlqInt(&result));
  EXPECT_EQ(v, result);
}

TEST(BitStreamUtil, ZigZag) {
  TestZigZag(0, {0, 0, 0, 0, 0});