base_buffer.hpp

 
#ifndef UFO_UTILITY_BASE_BUFFER_HPP
#define UFO_UTILITY_BASE_BUFFER_HPP
 
// UFO
#include <ufo/utility/io/dir.hpp>
 
// STL
#include <cstddef>
#include <cstdint>
 
namespace ufo
{
class BaseBuffer
{
 public:
    using size_type   = std::size_t;
    using pos_type    = std::uintmax_t;
    using offset_type = std::intmax_t;
 
    [[nodiscard]] constexpr std::byte const* data() const noexcept { return data_; }
 
    [[nodiscard]] constexpr bool empty() const noexcept { return 0 == size_; }
 
    [[nodiscard]] constexpr size_type size() const noexcept { return size_; }
 
 protected:
    constexpr BaseBuffer() = default;
 
    constexpr BaseBuffer(std::byte const* data, size_type size) : data_(data), size_(size)
    {
    }
 
    [[nodiscard]] constexpr pos_type pos(pos_type pos, offset_type off,
                                         IODir dir) const noexcept
    {
        switch (dir) {
            case IODir::Beg: return off;
            case IODir::End: return size_ + off;
            case IODir::Cur: return pos + off;
        }
 
        return 0;
    }
 
 protected:
    std::byte const* data_ = nullptr;
    size_type        size_{};
};
}  // namespace ufo
#endif  // UFO_UTILITY_BASE_BUFFER_HPP