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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. *
***************************************************************************/
#include <util/log.h>
#include <torrent/globals.h>
#include "circularbuffer.h"
#include "bufferedsocket.h"
using namespace bt;
namespace net
{
CircularBuffer::CircularBuffer(Uint32 max_size) : buf(0),max_size(max_size),first(0),size(0)
{
buf = new Uint8[max_size];
}
CircularBuffer::~CircularBuffer()
{
delete [] buf;
}
Uint32 CircularBuffer::freeSpace() const
{
return max_size - size;
}
Uint32 CircularBuffer::write(const Uint8* data,Uint32 dsize)
{
if (size == max_size)
return 0;
mutex.lock();
Uint32 wp = (first + size) % max_size;
Uint32 j = 0;
while (size < max_size && (dsize == 0 || j < dsize))
{
buf[wp] = data[j];
j++;
wp = (wp + 1) % max_size;
size++;
}
mutex.unlock();
return j;
}
Uint32 CircularBuffer::read(Uint8* data,Uint32 max_to_read)
{
if (!size)
return 0;
mutex.lock();
Uint32 j = 0;
while (size > 0 && j < max_to_read)
{
data[j] = buf[first];
j++;
first = (first + 1) % max_size;
size--;
}
mutex.unlock();
return j;
}
Uint32 CircularBuffer::send(BufferedSocket* s,Uint32 max)
{
if (!size)
return 0;
Uint32 ret = 0;
mutex.lock();
if (first + size <= max_size)
{
Uint32 ts = size;
if (max > 0 && size > max)
ts = max;
ret = s->send(buf + first,ts);
first += ret;
size -= ret;
}
else if (max > 0) // if there is a limit
{
// write from first to the end of the buffer
Uint32 to_send = max_size - first;
if (to_send > max)
to_send = max;
ret = s->send(buf + first,to_send);
// update first, wrap around if necessary
first = (first + ret) % max_size;
size -= ret; // ret bytes less in the buffer
max -= ret; // decrease limit
if (max > 0 && ret == to_send && size > 0)
{
// we have sent everything so we can send more
to_send = size > max ? max : size;
Uint32 ret2 = s->send(buf,to_send);
ret += ret2;
first += ret2;
size -= ret2;
}
}
else // no limit
{
Uint32 to_send = max_size - first;
ret = s->send(buf + first,to_send);
// update first, wrap around if necessary
first = (first + ret) % max_size;
size -= ret; // ret bytes less in the buffer
if (ret == to_send && size > 0)
{
// we have sent everything so we can send more
Uint32 ret2 = s->send(buf,size);
ret += ret2;
first += ret2;
size -= ret2;
}
}
mutex.unlock();
return ret;
}
}
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