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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) 2005-2008, 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;
}
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