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153 lines
3.5 KiB
153 lines
3.5 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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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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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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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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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 "plRingBuffer.h" |
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#include "HeadSpin.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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