Imported existing code

indra/llcommon/llfixedbuffer.cpp

@@ -0,0 +1,103 @@
+/** 
+ * @file llfixedbuffer.cpp
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, 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 "llfixedbuffer.h"
+
+////////////////////////////////////////////////////////////////////////////
+
+LLFixedBuffer::LLFixedBuffer(const U32 max_lines)
+	: LLLineBuffer(),
+	  mMaxLines(max_lines),
+	  mMutex(NULL)
+{
+	mTimer.reset();
+}
+
+LLFixedBuffer::~LLFixedBuffer()
+{
+	clear();
+}
+
+void LLFixedBuffer::clear()
+{
+	mMutex.lock() ;
+	mLines.clear();
+	mAddTimes.clear();
+	mLineLengths.clear();
+	mMutex.unlock() ;
+
+	mTimer.reset();
+}
+
+
+void LLFixedBuffer::addLine(const std::string& utf8line)
+{
+	LLWString wstring = utf8str_to_wstring(utf8line);
+	addWLine(wstring);
+}
+
+void LLFixedBuffer::addWLine(const LLWString& line)
+{
+	if (line.empty())
+	{
+		return;
+	}
+
+	removeExtraLines();
+
+	mMutex.lock() ;
+	mLines.push_back(line);
+	mLineLengths.push_back((S32)line.length());
+	mAddTimes.push_back(mTimer.getElapsedTimeF32());
+	mMutex.unlock() ;
+}
+
+
+void LLFixedBuffer::setMaxLines(S32 max_lines)
+{
+	mMaxLines = max_lines;
+
+	removeExtraLines();
+}
+
+
+void LLFixedBuffer::removeExtraLines()
+{
+	mMutex.lock() ;
+	while ((S32)mLines.size() > llmax((S32)0, (S32)(mMaxLines - 1)))
+	{
+		mLines.pop_front();
+		mAddTimes.pop_front();
+		mLineLengths.pop_front();
+	}
+	mMutex.unlock() ;
+}