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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
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 3 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/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
#include "hsUtils.h"
#include "plRingBuffer.h"
plRingBuffer::plRingBuffer(int size)
: plMemBuffer(size)
{
fEndPos = 0;
fStartPos = 0;
}
void plRingBuffer::FullCompress()
{
if (fStartPos == fEndPos)
{
fStartPos = 0;
fEndPos = 0;
}
else
{
ForceWindowSlide();
}
}
void plRingBuffer::Compress()
{
if (fStartPos == fEndPos)
{
fStartPos = 0;
fEndPos = 0;
}
else if(fStartPos >= GetBufferSize() / 2)
{
ForceWindowSlide();
}
}
bool plRingBuffer::Put(const char * data, int len)
{
bool ans = false;
if (len > BufferAvailable())
Compress();
if (len <= BufferAvailable())
{
memcpy(GetBufferOpen(), data, len);
fEndPos += len;
ans = true;
}
return ans;
}
bool plRingBuffer::Get(char * data, int len)
{
bool ans = false;
if (len < AmountBuffered())
{
memcpy(data, GetBufferStart(), len);
fStartPos += len;
Compress();
ans = true;
}
return ans;
}
int plRingBuffer::AmountBuffered()
{
return fEndPos - fStartPos;
}
int plRingBuffer::BufferAvailable()
{
return GetBufferSize() - fEndPos;
}
void plRingBuffer::Reset()
{
fStartPos = 0;
fEndPos = 0;
}
char * plRingBuffer::GetBufferStart()
{
return fBuffer+fStartPos;
}
char * plRingBuffer::GetBufferOpen()
{
return fBuffer+fEndPos;
}
void plRingBuffer::ForceWindowSlide()
{
int len = AmountBuffered();
if(len > 0 && fStartPos != 0)
{
memmove(fBuffer, GetBufferStart(), len);
fStartPos = 0;
fEndPos = len;
}
}
bool plRingBuffer::PutFast(const char * data, int len)
{
// no checking be careful
memcpy(GetBufferOpen(), data, len); // or memmove?
fEndPos += len;
return true;
}