nonowning_buffer.hpp

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#ifndef LIBFILEZILLA_NONOWNING_BUFFER_HEADER
#define LIBFILEZILLA_NONOWNING_BUFFER_HEADER
 
#include "libfilezilla.hpp"
 
#include <cstdint>

 
namespace fz {

class FZ_PUBLIC_SYMBOL nonowning_buffer final
{
public:
    constexpr nonowning_buffer() noexcept = default;
 
    explicit nonowning_buffer(uint8_t *buffer, size_t capacity) noexcept
        : buffer_(buffer)
        , capacity_(capacity)
    {
    }
 
    explicit nonowning_buffer(uint8_t *buffer, size_t capacity, size_t size) noexcept
        : buffer_(buffer)
        , capacity_(capacity)
        , size_(size)
    {
        if (size > capacity) {
            abort();
        }
    }
 
    // Copy is shallow!
    nonowning_buffer(nonowning_buffer const&) = default;
    nonowning_buffer& operator=(nonowning_buffer const&) = default;
 
    nonowning_buffer(nonowning_buffer &&) noexcept = default;
    nonowning_buffer& operator=(nonowning_buffer &&) noexcept = default;
 
    ~nonowning_buffer() noexcept = default;
 
    size_t capacity() const { return capacity_; }
    size_t size() const { return size_; }
    bool empty() const { return size_ == 0; }
    explicit operator bool() const { return !empty(); }

    void resize(size_t size);
    void clear() { resize(0); }

    uint8_t operator[](size_t offset) { return *(buffer_ + start_ + offset); }

    uint8_t const* get() const { return buffer_ + start_; }
    uint8_t * get() { return buffer_ + start_; }

    uint8_t* get(size_t bytes);

    void add(size_t bytes);

    void consume(size_t bytes);
 
    void reset();
 
    void append(uint8_t const* data, size_t len);
    void append(uint8_t c) { append(&c, 1); }
    void append(std::string_view const& str);
 
    std::string_view to_view() const;
 
private:
    uint8_t* buffer_{};
    size_t capacity_{};
    size_t size_{};
    size_t start_{};
};
}
 
#endif