Imported existing code

indra/llmessage/lliobuffer.cpp

@@ -0,0 +1,120 @@
+/** 
+ * @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) 2005-2009, 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;
+}