fastCommBuffer.h

#ifndef LIBFASTER_FASTCOMMBUFFER_H
#define LIBFASTER_FASTCOMMBUFFER_H


#include <vector>
#include <cstring>
#include <iostream>
#include <tuple>

#include "misc.h"

namespace faster {
    const int BUFFER_INITIAL_SIZE = 512*1024;

    class fastCommBuffer{
        private:
            char * _data;
            size_t _size;
            size_t _allocatedSize;
            bool _ownData;

        public:
            fastCommBuffer();
            fastCommBuffer(size_t s);
            ~fastCommBuffer();

            void setBuffer(void * buffer, size_t s);
            void reset();

            char * data();
            char * pos();
            char * pos(size_t pos);
            size_t size();
            size_t free();
            void advance(size_t pos);

            void grow(size_t s);

            void print();

            // WRITE Data
            template <typename T>
            void write(T &v, size_t s){
                grow(_size + s);
                //std::memcpy( &_data[_size], &v, s );
                std::copy( (char*)&v, ((char*)&v) + s , _data+_size );
                
                //char * p = (char*) &v;
                //for ( size_t i = 0; i < s; i++){
                    //_data[_size + i] = p[i];
                //}

                _size += s;
            }
            template <typename T>
            void writePos(const T &v, size_t s, size_t pos){
                grow(pos + s);
                //std::memcpy( &_data[pos], (char*) &v, s );
                std::copy((char*) &v, ((char*)&v) + s, _data + pos);
                //char * p = (char*) &v;
                //for ( size_t i = 0; i < s; i++){
                    //_data[_size + i] = p[i];
                //}

                if(_size < pos+s)
                    _size = pos+s;
            }
            template <typename T>
            void writePos(const T &v, size_t pos){
                writePos(v, sizeof(T), pos);
            }

            template <typename T>
            inline void writeSafe(T * v, size_t s){
                //std::memcpy( &_data[_size], v, s );
                std::copy( (char*)v, ((char*)v) + s, &_data[_size]);
                //char * p = (char*) &v;
                //for ( size_t i = 0; i < s; i++){
                //  _data[_size + i] = p[i];
                //}

                _size += s;
            }
            template <typename T>
            inline void write(T * v, size_t s){
                grow(_size + s);
                writeSafe(v, s);
            }
            /*void write(void * v, size_t s){
                std::memcpy( &_data[_size], v, s );
                _size += s;
            }// */

            template <typename T>
            void write(T v){
                write( v, sizeof(T) );
            }
            void write(std::string i){
                size_t s = i.length();
                grow(_size + sizeof(size_t) + s );
                writeSafe( &s, sizeof(size_t) );
                writeSafe( i.data(), s );
            }
            template <typename T>
            void write(std::vector<T> v){
                size_t s = v.size();
                grow(_size + sizeof(size_t) + s * sizeof(T));
                writeSafe( &s, sizeof(size_t) );
                writeSafe( v.data(), s * sizeof(T) );
            }
            template <typename K, typename T>
            void write(std::pair<K,T> p){
                write(p.first);
                write(p.second);
            }
            template <typename K, typename T>
            void write(std::tuple<K,T, size_t> t){
                write(std::get<0>(t));
                write(std::get<1>(t));
                write(std::get<2>(t));
            }
            void write(procstat &s);
            void writePos(procstat &s, size_t pos);
            void read(procstat &s);
            void advance(procstat &s);
        
            // READ Data
            template <typename T>
            void read(T & v, size_t s){
                //std::memcpy(&v, &_data[_size], s );
                std::copy(_data + _size, _data + _size + s, (char*) &v);
                //char * p = (char*) &v;
                //for ( size_t i = 0; i < s; i++){
                    //p[i] = _data[_size + i];
                //}
                _size += s;
            }
            template <typename T>
            void read(T * v, size_t s){
                //std::memcpy((char*)v, &_data[_size], s );
                std::copy(_data + _size, _data + _size + s, (char*) v);
                //char * p = (char*) &v;
                //for ( size_t i = 0; i < s; i++){
                    //p[i] = _data[_size + i];
                //}
                _size += s;
            }
            template <typename T>
            void read(T & v){
                read( &v, sizeof(T) );
            }
            template <typename T>
            void readVec(std::vector<T> & v, size_t s){
                v.assign((T*) &_data[_size], (T*) &_data[_size + s] );
                _size += s;
            }
            void readString(std::string & v, size_t s){
                v.assign( &_data[_size], &_data[_size] + s );
                _size += s;
            }
            template <typename T>
            void read(std::vector<T> & v){
                size_t size;
                read(size);
                readVec(v, size*sizeof(T));
            }
            void read(std::string & s){
                size_t size;
                read(size);
                readString(s, size);
            }
            template <typename K, typename T>
            void read(std::pair<K,T> & p){
                read(p.first);
                read(p.second);
            }
            template <typename K, typename T>
            void read(std::tuple<K,T, size_t> & t){
                K k;
                T type;
                size_t s;
                read(k);
                read(type);
                read(s);
                t = std::make_tuple (k,type,s);
            }

            // Operators

            template <typename T>
            fastCommBuffer & operator<<(T v){
                write(v);
                return *this;
            }

            template <typename T>
            fastCommBuffer & operator>>(T & v){
                read(v);
                return *this;
            }


    };
}

#endif