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153 lines
3.5 KiB
153 lines
3.5 KiB
14 years ago
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/*==LICENSE==*
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CyanWorlds.com Engine - MMOG client, server and tools
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13 years ago
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Copyright (C) 2011 Cyan Worlds, Inc.
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14 years ago
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 years ago
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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13 years ago
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Additional permissions under GNU GPL version 3 section 7
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If you modify this Program, or any covered work, by linking or
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
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(or a modified version of those libraries),
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
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licensors of this Program grant you additional
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permission to convey the resulting work. Corresponding Source for a
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non-source form of such a combination shall include the source code for
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
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work.
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14 years ago
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
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or by snail mail at:
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Cyan Worlds, Inc.
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14617 N Newport Hwy
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Mead, WA 99021
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*==LICENSE==*/
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#include "hsUtils.h"
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#include "plRingBuffer.h"
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plRingBuffer::plRingBuffer(int size)
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: plMemBuffer(size)
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{
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fEndPos = 0;
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fStartPos = 0;
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}
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void plRingBuffer::FullCompress()
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{
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if (fStartPos == fEndPos)
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{
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fStartPos = 0;
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fEndPos = 0;
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}
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else
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{
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ForceWindowSlide();
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}
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}
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void plRingBuffer::Compress()
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{
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if (fStartPos == fEndPos)
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{
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fStartPos = 0;
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fEndPos = 0;
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}
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else if(fStartPos >= GetBufferSize() / 2)
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{
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ForceWindowSlide();
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}
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}
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bool plRingBuffer::Put(const char * data, int len)
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{
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bool ans = false;
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if (len > BufferAvailable())
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Compress();
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if (len <= BufferAvailable())
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{
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memcpy(GetBufferOpen(), data, len);
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fEndPos += len;
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ans = true;
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}
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return ans;
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}
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bool plRingBuffer::Get(char * data, int len)
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{
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bool ans = false;
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if (len < AmountBuffered())
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{
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memcpy(data, GetBufferStart(), len);
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fStartPos += len;
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Compress();
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ans = true;
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}
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return ans;
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}
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int plRingBuffer::AmountBuffered()
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{
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return fEndPos - fStartPos;
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}
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int plRingBuffer::BufferAvailable()
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{
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return GetBufferSize() - fEndPos;
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}
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void plRingBuffer::Reset()
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{
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fStartPos = 0;
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fEndPos = 0;
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}
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char * plRingBuffer::GetBufferStart()
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{
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return fBuffer+fStartPos;
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}
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char * plRingBuffer::GetBufferOpen()
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{
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return fBuffer+fEndPos;
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}
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void plRingBuffer::ForceWindowSlide()
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{
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int len = AmountBuffered();
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if(len > 0 && fStartPos != 0)
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{
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memmove(fBuffer, GetBufferStart(), len);
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fStartPos = 0;
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fEndPos = len;
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}
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}
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bool plRingBuffer::PutFast(const char * data, int len)
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{
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// no checking be careful
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memcpy(GetBufferOpen(), data, len); // or memmove?
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fEndPos += len;
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return true;
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}
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