MessageBuffer.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __MESSAGEBUFFER_H_
#define __MESSAGEBUFFER_H_

#include "Define.h"
#include <vector>

class MessageBuffer
{
 typedef std::vector<uint8>::size_type size_type;

public:
 MessageBuffer() : _wpos(0), _rpos(0), _storage()
 {
 _storage.resize(4096);
 }

 explicit MessageBuffer(std::size_t initialSize) : _wpos(0), _rpos(0), _storage()
 {
 _storage.resize(initialSize);
 }

 MessageBuffer(MessageBuffer const& right) : _wpos(right._wpos), _rpos(right._rpos), _storage(right._storage)
 {
 }

 MessageBuffer(MessageBuffer&& right) : _wpos(right._wpos), _rpos(right._rpos), _storage(right.Move()) { }

 void Reset()
 {
 _wpos = 0;
 _rpos = 0;
 }

 void Resize(size_type bytes)
 {
 _storage.resize(bytes);
 }

 uint8* GetBasePointer() { return _storage.data(); }

 uint8* GetReadPointer() { return GetBasePointer() + _rpos; }

 uint8* GetWritePointer() { return GetBasePointer() + _wpos; }

 void ReadCompleted(size_type bytes) { _rpos += bytes; }

 void WriteCompleted(size_type bytes) { _wpos += bytes; }

 size_type GetActiveSize() const { return _wpos - _rpos; }

 size_type GetRemainingSpace() const { return _storage.size() - _wpos; }

 size_type GetBufferSize() const { return _storage.size(); }

 // Discards inactive data
 void Normalize()
 {
 if (_rpos)
 {
 if (_rpos != _wpos)
 memmove(GetBasePointer(), GetReadPointer(), GetActiveSize());
 _wpos -= _rpos;
 _rpos = 0;
 }
 }

 // Ensures there's "some" free space, make sure to call Normalize() before this
 void EnsureFreeSpace()
 {
 // resize buffer if it's already full
 if (GetRemainingSpace() == 0)
 _storage.resize(_storage.size() * 3 / 2);
 }

 void Write(void const* data, std::size_t size)
 {
 if (size)
 {
 memcpy(GetWritePointer(), data, size);
 WriteCompleted(size);
 }
 }

 std::vector<uint8>&& Move()
 {
 _wpos = 0;
 _rpos = 0;
 return std::move(_storage);
 }

 MessageBuffer& operator=(MessageBuffer const& right)
 {
 if (this != &right)
 {
 _wpos = right._wpos;
 _rpos = right._rpos;
 _storage = right._storage;
 }

 return *this;
 }

 MessageBuffer& operator=(MessageBuffer&& right)
 {
 if (this != &right)
 {
 _wpos = right._wpos;
 _rpos = right._rpos;
 _storage = right.Move();
 }

 return *this;
 }

private:
 size_type _wpos;
 size_type _rpos;
 std::vector<uint8> _storage;
};

#endif /* __MESSAGEBUFFER_H_ */