danicoin/src/Serialization/MemoryStream.h

// Copyright (c) 2011-2016 The Cryptonote developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#pragma once

#include <algorithm>
#include <cstdint>
#include <cstring> // memcpy
#include <vector>
#include <Common/IOutputStream.h>

namespace CryptoNote {

class MemoryStream: public Common::IOutputStream {
public:

  MemoryStream() : m_writePos(0) {
  }

  virtual size_t writeSome(const void* data, size_t size) override {
    if (size == 0) {
      return 0;
    }

    if (m_writePos + size > m_buffer.size()) {
      m_buffer.resize(m_writePos + size);
    }

    memcpy(&m_buffer[m_writePos], data, size);
    m_writePos += size;
    return size;
  }

  size_t size() {
    return m_buffer.size();
  }

  const uint8_t* data() {
    return m_buffer.data();
  }

  void clear() {
    m_writePos = 0;
    m_buffer.resize(0);
  }

private:
  size_t m_writePos;
  std::vector<uint8_t> m_buffer;
};

}