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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef NETCIRCULARBUFFER_H
#define NETCIRCULARBUFFER_H
#include <qmutex.h>
#include <util/constants.h>
namespace net
{
using bt::Uint8;
using bt::Uint32;
class BufferedSocket;
/**
* @author Joris Guisson <joris.guisson@gmail.com>
*
* Simple circular buffer, to simulate a queue.
* Writes happen at the end, reads at the beginning.
* The buffer is protected by a mutex.
*/
class CircularBuffer
{
Uint8* buf;
Uint32 max_size;
Uint32 first; // index of first byte in the buffer
Uint32 size; // number of bytes in use
mutable QMutex mutex;
public:
/**
* Create the buffer.
* @param max_size Maximum size of the buffer.
*/
CircularBuffer(Uint32 max_size);
virtual ~CircularBuffer();
/// How much capacity does the buffer have
Uint32 capacity() const {return max_size;}
/// How much free space is there
Uint32 freeSpace() const;
/**
* Write a bunch of data at the back of the buffer.
* @param data Data to write
* @param size How many bytes to write
* @return The number of bytes written in the buffer
*/
Uint32 write(const Uint8* data,Uint32 size);
/**
* Read from the buffer.
* @param data Buffer to store read data
* @param max_to_read Maximum amount of bytes to read
* @return The number of bytes read
*/
Uint32 read(Uint8* data,Uint32 max_to_read);
/**
* Send the data in the buffer over the socket
* @param s THe socket
* @param max Maximum bytes to send
* @return The number of bytes written
*/
Uint32 send(BufferedSocket* s,Uint32 max);
};
}
#endif
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