/*

 * Copyright 2016 Intel Corporation

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

// primary header

#include "bitReader.h"

// library headers

#include "common/unittest.h"

// system libraries

#include <limits>

#include <vector>

namespace YamiParser {

class BitReaderTest

    : public ::testing::Test

{

protected:

    std::vector<uint8_t>& largeData() const

    {

        static const uint32_t nBytes =

            (std::numeric_limits<uint32_t>::max() >> 3) + 1;

        static std::vector<uint8_t> data(nBytes);

        return data;

    }

};

#define BITREADER_TEST(name) \

    TEST_F(BitReaderTest, name)

BITREADER_TEST(NoOverflow)

{

    std::vector<uint8_t>& data = largeData();

    const uint32_t nBytes = data.size();

    ASSERT_EQ(0u, nBytes % (1024 * 1024 * 512));

    BitReader reader(&data[0], nBytes);

    EXPECT_FALSE(reader.end());

    EXPECT_EQ(0u, reader.getPos());

    EXPECT_EQ(static_cast<uint64_t>(nBytes) << 3,

        reader.getRemainingBitsCount());

    const uint32_t nReads = nBytes / BitReader::CACHEBYTES;

    const uint32_t rem = nBytes % BitReader::CACHEBYTES;

    const uint32_t bitsPerRead = BitReader::CACHEBYTES << 3;

    for (uint32_t i(0); i < nReads; ++i)

        reader.read(bitsPerRead);

    reader.read(rem << 3);

    EXPECT_EQ(static_cast<uint64_t>(nBytes) << 3, reader.getPos());

    EXPECT_TRUE(reader.end());

    EXPECT_EQ(0u, reader.getRemainingBitsCount());

}

void checkBitreadEmpty(BitReader& reader)

{

    EXPECT_TRUE(reader.end());

    EXPECT_EQ(0u, reader.getPos());

    EXPECT_EQ(0u,

        reader.getRemainingBitsCount());

    bool b;

    EXPECT_FALSE(reader.readT(b));

    EXPECT_TRUE(reader.end());

}

BITREADER_TEST(NullInit)

{

    uint8_t data = 0;

    BitReader r1(&data, 0);

    checkBitreadEmpty(r1);

    BitReader r2(NULL, 0);

    checkBitreadEmpty(r2);

    EXPECT_DEATH(BitReader r3(NULL, 1), "");

}

} // namespace YamiParser