migrate ALMOST everything from source tree into client

source/client/common/Util.cpp

@@ -0,0 +1,45 @@
+/********************************************************************
+	Minecraft: Pocket Edition - Decompilation Project
+	Copyright (C) 2023 iProgramInCpp
+	
+	The following code is licensed under the BSD 1 clause license.
+	SPDX-License-Identifier: BSD-1-Clause
+ ********************************************************************/
+
+#include "Util.hpp"
+
+std::string Util::stringTrim(const std::string& str, const std::string& filter, bool a4, bool a5)
+{
+	if (str.empty() || filter.empty())
+		return "";
+
+	// don't know what the hell this does. TODO: clean this crap up
+	if (!a4 && !a5)
+		return "";
+
+	int startIndex = 0, endIndex = int(str.size()) - 1;
+
+	// @TODO: Is this accurate?
+	if (a4)
+	{
+		while (startIndex < endIndex && strchr(filter.c_str(), str[startIndex]))
+		{
+			startIndex++;
+		}
+	}
+	if (a5)
+	{
+		while (startIndex < endIndex && strchr(filter.c_str(), str[endIndex]))
+		{
+			endIndex--;
+		}
+	}
+
+	return str.substr(startIndex, endIndex + 1 - startIndex);
+}
+
+std::string Util::stringTrim(const std::string& str)
+{
+	return stringTrim(str, " \t\n\r", true, true);
+}
+