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diff --git a/indra/llui/llchat.h b/indra/llui/llchat.h
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+/** 
+ * @file llchat.h
+ * @author James Cook
+ * @brief Chat constants and data structures.
+ *
+ * $LicenseInfo:firstyear=2006&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLCHAT_H
+#define LL_LLCHAT_H
+
+#include "lluuid.h"
+#include "v3math.h"
+
+// enumerations used by the chat system
+typedef enum e_chat_source_type
+{
+	CHAT_SOURCE_SYSTEM = 0,
+	CHAT_SOURCE_AGENT = 1,
+	CHAT_SOURCE_OBJECT = 2,
+	CHAT_SOURCE_UNKNOWN = 3
+} EChatSourceType;
+
+typedef enum e_chat_type
+{
+	CHAT_TYPE_WHISPER = 0,
+	CHAT_TYPE_NORMAL = 1,
+	CHAT_TYPE_SHOUT = 2,
+	CHAT_TYPE_START = 4,
+	CHAT_TYPE_STOP = 5,
+	CHAT_TYPE_DEBUG_MSG = 6,
+	CHAT_TYPE_REGION = 7,
+	CHAT_TYPE_OWNER = 8,
+	CHAT_TYPE_DIRECT = 9		// From llRegionSayTo()
+} EChatType;
+
+typedef enum e_chat_audible_level
+{
+	CHAT_AUDIBLE_NOT = -1,
+	CHAT_AUDIBLE_BARELY = 0,
+	CHAT_AUDIBLE_FULLY = 1
+} EChatAudible;
+
+typedef enum e_chat_style
+{
+	CHAT_STYLE_NORMAL,
+	CHAT_STYLE_IRC,
+	CHAT_STYLE_HISTORY
+}EChatStyle;
+
+// A piece of chat
+class LLChat
+{
+public:
+	LLChat(const std::string& text = std::string())
+	:	mText(text),
+		mFromName(),
+		mFromID(),
+		mNotifId(),
+		mOwnerID(),
+		mSourceType(CHAT_SOURCE_AGENT),
+		mChatType(CHAT_TYPE_NORMAL),
+		mAudible(CHAT_AUDIBLE_FULLY),
+		mMuted(FALSE),
+		mTime(0.0),
+		mTimeStr(),
+		mPosAgent(),
+		mURL(),
+		mChatStyle(CHAT_STYLE_NORMAL),
+		mSessionID()
+	{ }
+	
+	std::string		mText;		// UTF-8 line of text
+	std::string		mFromName;	// agent or object name
+	LLUUID			mFromID;	// agent id or object id
+	LLUUID			mNotifId;
+	LLUUID			mOwnerID;
+	EChatSourceType	mSourceType;
+	EChatType		mChatType;
+	EChatAudible	mAudible;
+	BOOL			mMuted;		// pass muted chat to maintain list of chatters
+	F64				mTime;		// viewer only, seconds from viewer start
+	std::string		mTimeStr;
+	LLVector3		mPosAgent;
+	std::string		mURL;
+	EChatStyle		mChatStyle;
+	LLUUID			mSessionID;
+};
+
+#endif