buffer_mutable.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_NET_BUFFER_MUTABLE_HPP
#define TETL_NET_BUFFER_MUTABLE_HPP
 
#include <etl/version.hpp>
 
#include <etl/array.hpp>
#include <etl/cstddef.hpp>
 
namespace etl::experimental::net {
struct mutable_buffer {
    mutable_buffer() noexcept = default;

    mutable_buffer(void* data, etl::size_t size)
        : _data{data}
        , _size{size}
    {
    }

    [[nodiscard]] auto data() const noexcept -> void* { return _data; }

    [[nodiscard]] auto size() const noexcept -> etl::size_t { return _size; }

    auto operator+=(etl::size_t n) noexcept -> mutable_buffer&
    {
        auto const offset = n < _size ? n : _size;
        _data             = static_cast<char*>(_data) + offset;
        _size -= offset;
        return *this;
    }
 
private:
    void* _data       = nullptr;
    etl::size_t _size = 0;
};

inline auto operator+(mutable_buffer const& b, etl::size_t const n) noexcept -> mutable_buffer
{
    auto offset = n < b.size() ? n : b.size();
    auto* data  = static_cast<char*>(b.data()) + offset;
    auto size   = b.size() - offset;
    return mutable_buffer{data, size};
}

inline auto operator+(etl::size_t const n, mutable_buffer const& b) noexcept -> mutable_buffer { return b + n; }
 
} // namespace etl::experimental::net
 
#endif // TETL_NET_BUFFER_MUTABLE_HPP