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/**
* @file lliobuffer.cpp
* @author Phoenix
* @date 2005-05-04
* @brief Definition of buffer based implementations of IO Pipes.
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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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