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136 lines
2.7 KiB
136 lines
2.7 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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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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