lliobuffer.cpp
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- /**
- * @file lliobuffer.cpp
- * @author Phoenix
- * @date 2005-05-04
- * @brief Definition of buffer based implementations of IO Pipes.
- *
- * $LicenseInfo:firstyear=2005&license=viewergpl$
- *
- * Copyright (c) 2005-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "linden_common.h"
- #include "lliobuffer.h"
- //
- // LLIOBuffer
- //
- LLIOBuffer::LLIOBuffer() :
- mBuffer(NULL),
- mBufferSize(0L),
- mReadHead(NULL),
- mWriteHead(NULL)
- {
- }
- LLIOBuffer::~LLIOBuffer()
- {
- if(mBuffer)
- {
- delete[] mBuffer;
- }
- }
- U8* LLIOBuffer::data() const
- {
- return mBuffer;
- }
- S64 LLIOBuffer::size() const
- {
- return mBufferSize;
- }
- U8* LLIOBuffer::current() const
- {
- return mReadHead;
- }
- S64 LLIOBuffer::bytesLeft() const
- {
- return mWriteHead - mReadHead;
- }
- void LLIOBuffer::clear()
- {
- mReadHead = mBuffer;
- mWriteHead = mBuffer;
- }
- LLIOPipe::EStatus LLIOBuffer::seek(LLIOBuffer::EHead head, S64 delta)
- {
- LLIOPipe::EStatus status = STATUS_ERROR;
- switch(head)
- {
- case READ:
- if(((delta >= 0) && ((mReadHead + delta) <= mWriteHead))
- || ((delta < 0) && ((mReadHead + delta) >= mBuffer)))
- {
- mReadHead += delta;
- status = STATUS_OK;
- }
- break;
- case WRITE:
- if(((delta >= 0) && ((mWriteHead + delta) < (mBuffer + mBufferSize)))
- || ((delta < 0) && ((mWriteHead + delta) > mReadHead)))
- {
- mWriteHead += delta;
- status = STATUS_OK;
- }
- default:
- break;
- }
- return status;
- }
- // virtual
- LLIOPipe::EStatus LLIOBuffer::process_impl(
- const LLChannelDescriptors& channels,
- buffer_ptr_t& buffer,
- bool& eos,
- LLSD& context,
- LLPumpIO* pump)
- {
- // no-op (I think)
- llwarns << "You are using an LLIOBuffer which is deprecated." << llendl;
- return STATUS_OK;
- }