Added merge sort

Temporary fix in IRC client

Jupiter/Algorithm.h

@@ -0,0 +1,222 @@
+/**
+ * Copyright (C) 2017 Jessica James.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Written by Jessica James <jessica.aj@outlook.com>
+ */
+
+#if !defined _ALGORITHM_H_HEADER
+#define _ALGORITHM_H_HEADER
+
+/**
+ * @file Algorithm.h
+ * @brief Provides various common algorithm implementations.
+ */
+
+namespace Jupiter
+{
+	namespace Algorithm
+	{
+		/**
+		* @brief Sorts an array of data in-place using merge sort
+		*
+		* @param in_data Data to sort
+		* @param in_data_length Length of the array of data to sort
+		*/
+		template<typename T> void merge_sort_serial(T *in_data, size_t in_data_length);
+
+		/**
+		* @brief Sorts an array of data in-place using merge sort across multiple threads
+		*
+		* @param in_data Data to sort
+		* @param in_data_length Length of the array of data to sort
+		* @param in_max_threads Maximum number of threads to use
+		* @param in_use_max_threads True to force the number of threads to in_max_threads
+		*/
+		template<typename T> void merge_sort_parallel(T *in_data, size_t in_data_length, unsigned int in_max_threads, bool in_force_max_threads = false);
+
+		/**
+		* @brief Sorts an array of data in-place using merge sort across multiple threads
+		*
+		* @param in_data Data to sort
+		* @param in_data_length Length of the array of data to sort
+		*/
+		template<typename T> void merge_sort_parallel(T *in_data, size_t in_data_length);
+
+		/**
+		* @brief Sorts an array of data in-place using merge sort across multiple threads
+		*
+		* @param in_data Data to sort
+		* @param in_data_length Length of the array of data to sort
+		*/
+		template<typename T> void merge_sort(T *in_data, size_t in_data_length);
+
+		/** Internal helper templates */
+		namespace Internal
+		{
+			template<typename T> void merge_sort_internal(T *in_source, size_t in_length, T *out_buffer, unsigned int unused_threads);
+		}
+	}
+}
+
+/**
+* IMPLEMENTATION:
+*	Merge Sort
+*/
+
+template<typename T> void Jupiter::Algorithm::merge_sort(T *in_data, size_t in_data_length)
+{
+	merge_sort_parallel<T>(in_data, in_data_length);
+}
+
+template<typename T> void Jupiter::Algorithm::merge_sort_parallel(T *in_data, size_t in_data_length)
+{
+	merge_sort_parallel<T>(in_data, in_data_length);
+}
+
+template<typename T> void Jupiter::Algorithm::merge_sort_parallel(T *in_data, size_t in_data_length, unsigned int in_max_threads, bool in_force_max_threads)
+{
+	constexpr size_t MINIMUM_ELEMENTS_PER_THREAD = 0x3FFF;
+
+	unsigned int thread_count = static_cast<unsigned int>(in_data_length) / MINIMUM_ELEMENTS_PER_THREAD;
+
+	if (thread_count > in_max_threads || in_force_max_threads)
+		thread_count = in_max_threads;
+
+	if (thread_count <= 1)
+	{
+		merge_sort_serial<T>(in_data, in_data_length);
+		return;
+	}
+
+	T *buffer = new T[in_data_length];
+
+	// copy base into buffer
+	for (size_t index = 0; index != in_data_length; ++index)
+		buffer[index] = in_data[index];
+
+	// mergesort into buffer
+	Internal::merge_sort_internal<T>(in_data, in_data_length, buffer, thread_count - 1);
+
+	// mergesort is complete; free buffer
+	delete[] buffer;
+}
+
+template<typename T> void Jupiter::Algorithm::merge_sort_serial(T *in_data, size_t in_data_length)
+{
+	if (in_data_length <= 1)
+		return;
+
+	T *buffer = new T[in_data_length];
+
+	// copy base into buffer
+	for (size_t index = 0; index != in_data_length; ++index)
+		buffer[index] = in_data[index];
+
+	// mergesort into buffer
+	Internal::merge_sort_internal<T>(in_data, in_data_length, buffer, 0);
+
+	// mergesort is complete; free buffer
+	delete[] buffer;
+}
+
+/** Internals */
+
+template<typename T> void Jupiter::Algorithm::Internal::merge_sort_internal(T *in_source, size_t in_length, T *out_buffer, unsigned int unused_threads)
+{
+	if (in_length <= 1) // Nothing to sort
+		return;
+
+	/** Split */
+
+	T *left_buffer = out_buffer;
+	size_t left_length = in_length / 2;
+
+	T *right_buffer = out_buffer + left_length;
+	size_t right_length = in_length - left_length;
+
+	if (unused_threads == 0) // serial
+	{
+		// sort left
+		merge_sort_internal<T>(left_buffer, left_length, in_source, 0);
+
+		// sort right
+		merge_sort_internal<T>(right_buffer, right_length, in_source + left_length, 0);
+	}
+	else // parallel
+	{
+		--unused_threads;
+
+		unsigned int left_thread_count = unused_threads / 2;
+
+		// sort left
+		std::thread left_sort_thread(merge_sort_internal<T>, left_buffer, left_length, in_source, left_thread_count);
+
+		// sort right
+		merge_sort_internal<T>(right_buffer, right_length, in_source + left_length, unused_threads - left_thread_count);
+
+		left_sort_thread.join();
+	}
+
+	// merge left & right
+	while (true)
+	{
+		if (*right_buffer < *left_buffer)
+		{
+			*in_source = *right_buffer;
+
+			++in_source;
+			++right_buffer;
+
+			if (--right_length == 0)
+			{
+				// Only values on the left side remain
+				while (left_length != 0)
+				{
+					*in_source = *left_buffer;
+
+					++in_source;
+					++left_buffer;
+					--left_length;
+				}
+
+				return;
+			}
+		}
+		else
+		{
+			*in_source = *left_buffer;
+
+			++in_source;
+			++left_buffer;
+
+			if (--left_length == 0)
+			{
+				// Only values on the right side remain
+				while (right_length != 0)
+				{
+					*in_source = *right_buffer;
+
+					++in_source;
+					++right_buffer;
+					--right_length;
+				}
+
+				return;
+			}
+		}
+	}
+}
+
+#endif // _ALGORITHM_H_HEADER

Jupiter/IRC_Client.cpp

@@ -1553,27 +1553,37 @@ size_t Jupiter::IRC::Client::User::getChannelCount() const
 
 Jupiter::IRC::Client::Channel::Channel(const Jupiter::ReadableString &in_name, Jupiter::IRC::Client *in_parent)
 {
+	auto to_lower = [&in_name]()
+	{
+		Jupiter::String result(in_name.size());
+		const char *itr = in_name.ptr();
+		const char *end = itr + in_name.size();
+
+		while (itr != end)
+		{
+			result += tolower(*itr);
+			++itr;
+		}
+
+		return result;
+	};
+
 	m_name = in_name;
 	m_parent = in_parent;
 	m_type = m_parent->getDefaultChanType();
 
-	auto read_type = [&in_name](Jupiter::Config &in_config, int default_type)
+	Jupiter::String name = to_lower();
+
+	auto read_type = [&name](Jupiter::Config &in_config, int default_type)
 	{
-		return in_config["Channels"_jrs][in_name].get<int>("Type"_jrs, default_type);
+		return in_config["Channels"_jrs][name].get<int>("Type"_jrs, default_type);
 	};
 
-	if (m_parent->getPrimaryConfigSection() == nullptr)
-	{
-		if (m_parent->getSecondaryConfigSection() != nullptr)
-			m_type = read_type(*m_parent->getSecondaryConfigSection(), m_type);
-	}
-	else if (m_parent->getSecondaryConfigSection() == nullptr)
+	if (m_parent->getSecondaryConfigSection() != nullptr)
+		m_type = read_type(*m_parent->getSecondaryConfigSection(), m_type);
+
+	if (m_parent->getPrimaryConfigSection() != nullptr)
 		m_type = read_type(*m_parent->getPrimaryConfigSection(), m_type);
-	else
-	{
-		m_type = read_type(*m_parent->getPrimaryConfigSection(),
-			read_type(*m_parent->getSecondaryConfigSection(), m_type));
-	}
 }
 
 Jupiter::IRC::Client::Channel::User *Jupiter::IRC::Client::Channel::addUser(Jupiter::IRC::Client::User *user)

Jupiter/Jupiter.vcxproj

@@ -202,6 +202,7 @@
     <ClCompile Include="INIConfig.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="Algorithm.h" />
     <ClInclude Include="ArrayList.h" />
     <ClInclude Include="Base64.h" />
     <ClInclude Include="Command.h" />

Jupiter/Jupiter.vcxproj.filters

@@ -272,6 +272,9 @@
     <ClInclude Include="INIConfig.h">
       <Filter>Header Files\Files\Configs</Filter>
     </ClInclude>
+    <ClInclude Include="Algorithm.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="Jupiter.rc">