Imported existing code

indra/llmessage/lldispatcher.cpp

@@ -0,0 +1,153 @@
+/** 
+ * @file lldispatcher.cpp
+ * @brief Implementation of the dispatcher object.
+ *
+ * $LicenseInfo:firstyear=2004&license=viewergpl$
+ * 
+ * Copyright (c) 2004-2009, 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 "lldispatcher.h"
+
+#include <algorithm>
+#include "llstl.h"
+#include "message.h"
+
+///----------------------------------------------------------------------------
+/// Class lldispatcher
+///----------------------------------------------------------------------------
+
+
+LLDispatcher::LLDispatcher()
+{
+}
+
+LLDispatcher::~LLDispatcher()
+{
+}
+
+bool LLDispatcher::isHandlerPresent(const key_t& name) const
+{
+	if(mHandlers.find(name) != mHandlers.end())
+	{
+		return true;
+	}
+	return false;
+}
+
+void LLDispatcher::copyAllHandlerNames(keys_t& names) const
+{
+	// copy the names onto the vector we are given
+	std::transform(
+		mHandlers.begin(),
+		mHandlers.end(),
+		std::back_insert_iterator<keys_t>(names),
+		llselect1st<dispatch_map_t::value_type>());
+}
+
+bool LLDispatcher::dispatch(
+	const key_t& name,
+	const LLUUID& invoice,
+	const sparam_t& strings) const
+{
+	dispatch_map_t::const_iterator it = mHandlers.find(name);
+	if(it != mHandlers.end())
+	{
+		LLDispatchHandler* func = (*it).second;
+		return (*func)(this, name, invoice, strings);
+	}
+	llwarns << "Unable to find handler for Generic message: " << name << llendl;
+	return false;
+}
+
+LLDispatchHandler* LLDispatcher::addHandler(
+	const key_t& name, LLDispatchHandler* func)
+{
+	dispatch_map_t::iterator it = mHandlers.find(name);
+	LLDispatchHandler* old_handler = NULL;
+	if(it != mHandlers.end())
+	{
+		old_handler = (*it).second;
+		mHandlers.erase(it);
+	}
+	if(func)
+	{
+		// only non-null handlers so that we don't have to worry about
+		// it later.
+		mHandlers.insert(dispatch_map_t::value_type(name, func));
+	}
+	return old_handler;
+}
+
+// static
+bool LLDispatcher::unpackMessage(
+		LLMessageSystem* msg,
+		LLDispatcher::key_t& method,
+		LLUUID& invoice,
+		LLDispatcher::sparam_t& parameters)
+{
+	char buf[MAX_STRING];	/*Flawfinder: ignore*/
+	msg->getStringFast(_PREHASH_MethodData, _PREHASH_Method, method);
+	msg->getUUIDFast(_PREHASH_MethodData, _PREHASH_Invoice, invoice);
+	S32 size;
+	S32 count = msg->getNumberOfBlocksFast(_PREHASH_ParamList);
+	for (S32 i = 0; i < count; ++i)
+	{
+		// we treat the SParam as binary data (since it might be an 
+		// LLUUID in compressed form which may have embedded \0's,)
+		size = msg->getSizeFast(_PREHASH_ParamList, i, _PREHASH_Parameter);
+		if (size >= 0)
+		{
+			msg->getBinaryDataFast(
+				_PREHASH_ParamList, _PREHASH_Parameter,
+				buf, size, i, MAX_STRING-1);
+
+			// If the last byte of the data is 0x0, this is either a normally
+			// packed string, or a binary packed UUID (which for these messages
+			// are packed with a 17th byte 0x0).  Unpack into a std::string
+			// without the trailing \0, so "abc\0" becomes std::string("abc", 3)
+			// which matches const char* "abc".
+			if (size > 0
+				&& buf[size-1] == 0x0)
+			{
+				// special char*/size constructor because UUIDs may have embedded
+				// 0x0 bytes.
+				std::string binary_data(buf, size-1);
+				parameters.push_back(binary_data);
+			}
+			else
+			{
+				// This is either a NULL string, or a string that was packed 
+				// incorrectly as binary data, without the usual trailing '\0'.
+				std::string string_data(buf, size);
+				parameters.push_back(string_data);
+			}
+		}
+	}
+	return true;
+}