/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/base/data_view.h"

#include <cstring>

#include "mongo/base/data_type_endian.h"
#include "mongo/platform/endian.h"
#include "mongo/unittest/unittest.h"

namespace mongo {

TEST(DataView, ConstDataView) {
    char buf[sizeof(uint32_t) * 3];
    uint32_t native = 1234;
    uint32_t le = endian::nativeToLittle(native);
    uint32_t be = endian::nativeToBig(native);

    std::memcpy(buf, &native, sizeof(uint32_t));
    std::memcpy(buf + sizeof(uint32_t), &le, sizeof(uint32_t));
    std::memcpy(buf + sizeof(uint32_t) * 2, &be, sizeof(uint32_t));

    ConstDataView cdv(buf);

    ASSERT_EQUALS(buf, cdv.view());
    ASSERT_EQUALS(buf + 5, cdv.view(5));

    ASSERT_EQUALS(native, cdv.read<uint32_t>());
    ASSERT_EQUALS(native, cdv.read<LittleEndian<uint32_t>>(sizeof(uint32_t)));
    ASSERT_EQUALS(native, cdv.read<BigEndian<uint32_t>>(sizeof(uint32_t) * 2));
}

TEST(DataView, DataView) {
    char buf[sizeof(uint32_t) * 3];
    uint32_t native = 1234;

    DataView dv(buf);

    dv.write(native);
    dv.write(LittleEndian<uint32_t>(native), sizeof(uint32_t));
    dv.write(BigEndian<uint32_t>(native), sizeof(uint32_t) * 2);

    ASSERT_EQUALS(buf, dv.view());
    ASSERT_EQUALS(buf + 5, dv.view(5));

    ASSERT_EQUALS(native, dv.read<uint32_t>());
    ASSERT_EQUALS(native, dv.read<LittleEndian<uint32_t>>(sizeof(uint32_t)));
    ASSERT_EQUALS(native, dv.read<BigEndian<uint32_t>>(sizeof(uint32_t) * 2));
}

}  // namespace mongo