// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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.

#pragma once

#include <gen_cpp/segment_v2.pb.h>

#include <cstdint>

#include <string>

#include "util/coding.h"

#include "util/faststring.h"

namespace doris {

namespace segment_v2 {

struct PagePointer {

    uint64_t offset;

    uint32_t size;

    PagePointer() : offset(0), size(0) {}

    PagePointer(uint64_t offset_, uint32_t size_) : offset(offset_), size(size_) {}

    PagePointer(const PagePointerPB& from) : offset(from.offset()), size(from.size()) {}

    void reset() {

        offset = 0;

        size = 0;

    }

    void to_proto(PagePointerPB* to) {

        to->set_offset(offset);

        to->set_size(size);

    }

    const uint8_t* decode_from(const uint8_t* data, const uint8_t* limit) {

        data = decode_varint64_ptr(data, limit, &offset);

        if (data == nullptr) {

            return nullptr;

        }

        return decode_varint32_ptr(data, limit, &size);

    }

    bool decode_from(Slice* input) {

        bool result = get_varint64(input, &offset);

        if (!result) {

            return false;

        }

        return get_varint32(input, &size);

    }

    void encode_to(faststring* dst) const { put_varint64_varint32(dst, offset, size); }

    void encode_to(std::string* dst) const { put_varint64_varint32(dst, offset, size); }

    bool operator==(const PagePointer& other) const {

        return offset == other.offset && size == other.size;

    }

    bool operator!=(const PagePointer& other) const { return !(*this == other); }

};

inline std::ostream& operator<<(std::ostream& os, const PagePointer& pp) {

    os << "PagePointer { offset=" << pp.offset << " size=" << pp.size << " }";

    return os;

}

} // namespace segment_v2

} // namespace doris