Iobuffer.h

/*

Copyright (c) 2018, Johnathan Corkery. (jcorkery@umich.edu)
All rights reserved.

This file is part of the Dynacoe project (https://github.com/jcorks/Dynacoe)
Dynacoe was released under the MIT License, as detailed below.



Permission is hereby granted, free of charge, to any person obtaining a copy 
of this software and associated documentation files (the "Software"), to deal 
in the Software without restriction, including without limitation the rights 
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
copies of the Software, and to permit persons to whom the Software is furnished 
to do so, subject to the following conditions:

The above copyright notice and this permission notice shall
be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.



*/

/*  Input / OutputBuffer classes:
 *  A complete and concise solution for binary data with data streams.
 *

 */

#ifndef H_IOBUFFER_INCLUDED
#define H_IOBUFFER_INCLUDED

#include <string>
#include <cstring>
#include <vector>



namespace Dynacoe {
class InputBuffer {


  public:

    InputBuffer();
    ~InputBuffer();

    void OpenBuffer(const std::vector<uint8_t> & buffer);

    void Open(const std::string & file);

    std::string ReadString(unsigned int nBytes);

    std::vector<uint8_t> ReadBytes(uint32_t numBytes);

    template<typename T>
    T Read();

    template<typename T>
    void Read(T &);

    void GoToByte(int nBytes);


    int Size();

    int BytesLeft();

    bool ReachedEnd();
  private:
    uint8_t * buffer;
    int bufferPos;
    long size;
    void * readN(int num);
    void readN(void *, uint32_t);
    uint8_t * immediateBuffer;

};

class OutputBuffer {
  public:


    OutputBuffer();
    ~OutputBuffer();

    bool CommitToFile(std::string fileName, bool append);

    template<typename T>
    void Write(const T &);
    void WriteBytes(const std::vector<uint8_t> & data);
    void WriteString(std::string str);

    void GoToByte(int n);

    std::vector<uint8_t> GetData();

    int Size();

    void Clear();

  private:
    uint8_t * buffer;
    int bufferPos;
    long size;
    long operationalSize;

    void resize();




};
}









template <typename T>
void Dynacoe::OutputBuffer::Write(const T & obj) {
    uint8_t * block = (uint8_t *) &obj;
    std::vector<uint8_t> data(block, block+sizeof(T));
    WriteBytes(data);
}


template <typename T>
T Dynacoe::InputBuffer::Read() {
    T object;
    std::vector<uint8_t> data = ReadBytes(sizeof(T));
    if (!data.size()) return T();
    memcpy(&object, &data[0], sizeof(object));
    return object;
}


template <typename T>
void Dynacoe::InputBuffer::Read(T & o) {
    readN(&o, sizeof(o));
}
#endif