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/*
* Copyright (C) 2008-2019 TrinityCore <https://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>
#include <cstring>
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_ */
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