121 lines
2.8 KiB
C++
121 lines
2.8 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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* $LicenseInfo:firstyear=2005&license=viewergpl$
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*
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* Copyright (c) 2005-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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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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llwarns << "You are using an LLIOBuffer which is deprecated." << llendl;
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return STATUS_OK;
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}
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