libserv/byte_buffer.hpp at master · 42-serv/libserv · GitHub

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/* Any copyright is dedicated to the Public Domain.
 * https://creativecommons.org/publicdomain/zero/1.0/ */

#pragma once

#include "serv_types.hpp"

#include <cassert>
#include <cstring>

namespace ft
{
    namespace serv
    {
        class byte_buffer
        {
        public:
            typedef dynamic_array<byte_t>::type container_type;
            typedef container_type::size_type size_type;
            typedef container_type::iterator iterator;

        private:
            container_type buffer;
            size_type position;

        public:
            inline byte_buffer()
                : buffer(),
                  position()
            {
            }

            inline byte_buffer(size_type length)
                : buffer(length),
                  position()
            {
            }

            inline byte_buffer(const byte_buffer& that)
                : buffer(that.buffer),
                  position(that.position)
            {
            }

            inline byte_buffer& operator=(byte_buffer that)
            {
                this->buffer.swap(that.buffer);
                this->position = that.position;
                return *this;
            }

            inline ~byte_buffer()
            {
            }

            inline byte_t* raw_buffer() throw()
            {
                return this->buffer.data();
            }

            inline size_type raw_length() const throw()
            {
                return this->buffer.size();
            }

            inline void raw_shrink(size_type length)
            {
                assert(length <= this->buffer.size());

                this->buffer.resize(length);
            }

            inline const byte_t* get() const throw()
            {
                return &this->buffer[this->position];
            }

            template <typename T>
            inline T get(const size_type offset = size_type()) const
            {
                assert(this->size() >= offset + sizeof(T));

                // Copy elision
                T t;
                std::memcpy(&t, this->get() + offset, sizeof(t));
                return t;
            }

            inline size_type size() const throw()
            {
                assert(this->buffer.size() >= this->position);

                return this->buffer.size() - this->position;
            }

            inline bool empty() const throw()
            {
                assert(this->buffer.size() >= this->position);

                return this->buffer.size() == this->position;
            }

            inline void put(const void* const data, const size_type size)
            {
                const byte_t* const array = reinterpret_cast<const byte_t*>(data);
                this->buffer.insert(this->buffer.end(), beginof(array), &array[size]);
            }

            template <typename T>
            inline void put(const T& t)
            {
                byte_t data[sizeof(t)];
                std::memcpy(&data, &t, sizeof(t));
                this->put(data, sizeof(t));
            }

            inline void append_from(const byte_buffer& t)
            {
                this->put(t.get(), t.size());
            }

            inline void remove(const size_type size) throw()
            {
                assert(this->size() >= size);

                this->position += size;
            }

            inline void discard() throw()
            {
                const iterator begin = this->buffer.begin();
                const iterator end = begin + this->position;
                this->buffer.erase(begin, end);
                this->position = size_type();
            }

            inline void clear() throw()
            {
                this->buffer.clear();
                this->position = size_type();
            }
        };
    }
}