115 lines
2.4 KiB
C++
115 lines
2.4 KiB
C++
/**
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* @file lliobuffer.cpp
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* @author Phoenix
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* @date 2005-05-04
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* @brief Definition of buffer based implementations of IO Pipes.
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*
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* $LicenseInfo:firstyear=2005&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "lliobuffer.h"
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//
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// LLIOBuffer
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//
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LLIOBuffer::LLIOBuffer() :
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mBuffer(NULL),
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mBufferSize(0L),
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mReadHead(NULL),
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mWriteHead(NULL)
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{
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}
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LLIOBuffer::~LLIOBuffer()
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{
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if(mBuffer)
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{
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delete[] mBuffer;
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}
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}
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U8* LLIOBuffer::data() const
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{
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return mBuffer;
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}
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S64 LLIOBuffer::size() const
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{
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return mBufferSize;
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}
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U8* LLIOBuffer::current() const
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{
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return mReadHead;
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}
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S64 LLIOBuffer::bytesLeft() const
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{
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return mWriteHead - mReadHead;
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}
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void LLIOBuffer::clear()
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{
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mReadHead = mBuffer;
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mWriteHead = mBuffer;
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}
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LLIOPipe::EStatus LLIOBuffer::seek(LLIOBuffer::EHead head, S64 delta)
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{
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LLIOPipe::EStatus status = STATUS_ERROR;
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switch(head)
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{
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case READ:
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if(((delta >= 0) && ((mReadHead + delta) <= mWriteHead))
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|| ((delta < 0) && ((mReadHead + delta) >= mBuffer)))
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{
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mReadHead += delta;
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status = STATUS_OK;
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}
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break;
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case WRITE:
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if(((delta >= 0) && ((mWriteHead + delta) < (mBuffer + mBufferSize)))
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|| ((delta < 0) && ((mWriteHead + delta) > mReadHead)))
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{
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mWriteHead += delta;
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status = STATUS_OK;
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}
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default:
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break;
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}
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return status;
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}
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// virtual
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LLIOPipe::EStatus LLIOBuffer::process_impl(
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const LLChannelDescriptors& channels,
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buffer_ptr_t& buffer,
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bool& eos,
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LLSD& context,
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LLPumpIO* pump)
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{
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// no-op (I think)
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LL_WARNS() << "You are using an LLIOBuffer which is deprecated." << LL_ENDL;
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return STATUS_OK;
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}
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