init

src/utils/compression.cpp

@@ -0,0 +1,280 @@
+#include <std_include.hpp>
+
+#include "compression.hpp"
+
+#include <unzip.h>
+
+#include <zlib.h>
+#include <zip.h>
+
+#include <gsl/gsl>
+
+#include "io.hpp"
+#include "string.hpp"
+
+#ifndef MAX_PATH
+#define MAX_PATH 256
+#endif
+
+namespace utils::compression
+{
+	namespace zlib
+	{
+		namespace
+		{
+			class zlib_stream
+			{
+			public:
+				zlib_stream()
+				{
+					memset(&stream_, 0, sizeof(stream_));
+					valid_ = inflateInit(&stream_) == Z_OK;
+				}
+
+				zlib_stream(zlib_stream&&) = delete;
+				zlib_stream(const zlib_stream&) = delete;
+				zlib_stream& operator=(zlib_stream&&) = delete;
+				zlib_stream& operator=(const zlib_stream&) = delete;
+
+				~zlib_stream()
+				{
+					if (valid_)
+					{
+						inflateEnd(&stream_);
+					}
+				}
+
+				z_stream& get()
+				{
+					return stream_; //
+				}
+
+				bool is_valid() const
+				{
+					return valid_;
+				}
+
+			private:
+				bool valid_{false};
+				z_stream stream_{};
+			};
+		}
+
+		std::string decompress(const std::string& data)
+		{
+			std::string buffer{};
+			zlib_stream stream_container{};
+			if (!stream_container.is_valid())
+			{
+				return {};
+			}
+
+			int ret{};
+			size_t offset = 0;
+			static thread_local uint8_t dest[CHUNK] = {0};
+			auto& stream = stream_container.get();
+
+			do
+			{
+				const auto input_size = std::min(sizeof(dest), data.size() - offset);
+				stream.avail_in = static_cast<uInt>(input_size);
+				stream.next_in = reinterpret_cast<const Bytef*>(data.data()) + offset;
+				offset += stream.avail_in;
+
+				do
+				{
+					stream.avail_out = sizeof(dest);
+					stream.next_out = dest;
+
+					ret = inflate(&stream, Z_NO_FLUSH);
+					if (ret != Z_OK && ret != Z_STREAM_END)
+					{
+						return {};
+					}
+
+					buffer.insert(buffer.end(), dest, dest + sizeof(dest) - stream.avail_out);
+				}
+				while (stream.avail_out == 0);
+			}
+			while (ret != Z_STREAM_END);
+
+			return buffer;
+		}
+
+		std::string compress(const std::string& data)
+		{
+			std::string result{};
+			auto length = compressBound(static_cast<uLong>(data.size()));
+			result.resize(length);
+
+			if (compress2(reinterpret_cast<Bytef*>(result.data()), &length,
+			              reinterpret_cast<const Bytef*>(data.data()), static_cast<uLong>(data.size()),
+			              Z_BEST_COMPRESSION) != Z_OK)
+			{
+				return {};
+			}
+
+			result.resize(length);
+			return result;
+		}
+	}
+
+	namespace zip
+	{
+		namespace
+		{
+			bool add_file(zipFile& zip_file, const std::string& filename, const std::string& data)
+			{
+				const auto zip_64 = data.size() > 0xffffffff ? 1 : 0;
+				if (ZIP_OK != zipOpenNewFileInZip64(zip_file, filename.c_str(), nullptr, nullptr, 0, nullptr, 0, nullptr,
+				                                    Z_DEFLATED, Z_BEST_COMPRESSION, zip_64))
+				{
+					return false;
+				}
+
+				const auto _ = gsl::finally([&zip_file]() -> void
+				{
+					zipCloseFileInZip(zip_file);
+				});
+
+				return ZIP_OK == zipWriteInFileInZip(zip_file, data.c_str(), static_cast<unsigned>(data.size()));
+			}
+		}
+
+		void archive::add(const std::string& filename, const std::string& data)
+		{
+			this->files_[filename] = data;
+		}
+
+		bool archive::write(const std::string& filename, const std::string& comment)
+		{
+			// Hack to create the directory :3
+			io::write_file(filename, {});
+			io::remove_file(filename);
+
+			auto* zip_file = zipOpen64(filename.c_str(), false);
+			if (!zip_file)
+			{
+				return false;
+			}
+
+			const auto _ = gsl::finally([&zip_file, &comment]() -> void
+			{
+				zipClose(zip_file, comment.empty() ? nullptr : comment.c_str());
+			});
+
+			for (const auto& file : this->files_)
+			{
+				if (!add_file(zip_file, file.first, file.second))
+				{
+					return false;
+				}
+			}
+
+			return true;
+		}
+
+		// I apologize for writing such a huge function
+		void archive::decompress(const std::string& filename, const std::filesystem::path& out_dir)
+		{
+			unzFile file = unzOpen(filename.c_str());
+			if (!file)
+			{
+				throw std::runtime_error(string::va("unzOpen failed on %s", filename.c_str()));
+			}
+
+			unz_global_info global_info;
+			if (unzGetGlobalInfo(file, &global_info) != UNZ_OK)
+			{
+				unzClose(file);
+				throw std::runtime_error(string::va("unzGetGlobalInfo failed on %s", filename.c_str()));
+			}
+
+			constexpr std::size_t READ_BUFFER_SIZE = 65336;
+			const auto read_buffer_large = std::make_unique<char[]>(READ_BUFFER_SIZE);
+			// No need to memset this to 0
+			auto* read_buffer = read_buffer_large.get();
+
+			// Loop to extract all the files
+			for (uLong i = 0; i < global_info.number_entry; ++i)
+			{
+				// Get info about the current file.
+				unz_file_info file_info;
+				char filename_buffer[MAX_PATH]{};
+
+				if (unzGetCurrentFileInfo(file, &file_info, filename_buffer, sizeof(filename_buffer) - 1,
+				                          nullptr, 0, nullptr, 0) != UNZ_OK)
+				{
+					continue;
+				}
+
+				// Check if this entry is a directory or a file.
+				std::string out_file = filename_buffer;
+				// Fix for UNIX Systems
+				std::replace(out_file.begin(), out_file.end(), '\\', '/');
+
+				const auto filename_length = out_file.size();
+				if (out_file[filename_length - 1] == '/') // ZIP is not directory-separator-agnostic
+				{
+					// Entry is a directory. Create it.
+					const auto dir = out_dir / out_file;
+					io::create_directory(dir);
+				}
+				else
+				{
+					// Entry is a file. Extract it.
+					if (unzOpenCurrentFile(file) != UNZ_OK)
+					{
+						// Could not read file from the ZIP
+						throw std::runtime_error(string::va("Failed to read file \"%s\" from \"%s\"", out_file.c_str(), filename.c_str()));
+					}
+					
+					const auto path = out_dir / out_file;
+					// Must create any directories before opening a stream
+					io::create_directory(path.parent_path());
+
+					// Open a stream to write out the data.
+					std::ofstream out(path.string(), std::ios::binary | std::ios::trunc);
+					if (!out.is_open())
+					{
+						throw std::runtime_error("Failed to open stream");
+					}
+
+					auto read_bytes = UNZ_OK;
+					while (true)
+					{
+						read_bytes = unzReadCurrentFile(file, read_buffer, READ_BUFFER_SIZE);
+						if (read_bytes < 0)
+						{
+							throw std::runtime_error(string::va("Error while reading \"%s\" from the archive", out_file.c_str()));
+						}
+
+						if (read_bytes > 0)
+						{
+							out.write(read_buffer, read_bytes);
+						}
+						else
+						{
+							// No more data to read, the loop will break
+							// This is normal behaviour
+							break;
+						}
+					}
+
+					out.close();
+				}
+
+				// Go the the next entry listed in the ZIP file.
+				if ((i + 1) < global_info.number_entry)
+				{
+					if (unzGoToNextFile(file) != UNZ_OK)
+					{
+						break;
+					}
+				}
+			}
+
+			unzClose(file);
+		}
+	}
+}

src/utils/compression.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <filesystem>
+#include <string>
+#include <unordered_map>
+
+#define CHUNK 16384u
+
+namespace utils::compression
+{
+	namespace zlib
+	{
+		std::string compress(const std::string& data);
+		std::string decompress(const std::string& data);
+	}
+
+	namespace zip
+	{
+		class archive
+		{
+		public:
+			void add(const std::string& filename, const std::string& data);
+			[[nodiscard]] bool write(const std::string& filename, const std::string& comment = {});
+
+			static void decompress(const std::string& filename, const std::filesystem::path& out_dir);
+
+		private:
+			std::unordered_map<std::string, std::string> files_;
+		};
+	}
+};

src/utils/http.cpp

@@ -0,0 +1,65 @@
+#include <std_include.hpp>
+
+#include "http.hpp"
+#include <curl/curl.h>
+
+namespace utils::http
+{
+	namespace
+	{
+		size_t write_callback(void* contents, const size_t size, const size_t nmemb, void* userp)
+		{
+			static_cast<std::string*>(userp)->append(static_cast<char*>(contents), size * nmemb);
+			return size * nmemb;
+		}
+	}
+
+	std::optional<std::string> get_data(const std::string& url, const headers& headers)
+	{
+		curl_slist* header_list = nullptr;
+		auto* curl = curl_easy_init();
+		if (!curl)
+		{
+			return {};
+		}
+
+		auto _ = gsl::finally([&]()
+		{
+			curl_slist_free_all(header_list);
+			curl_easy_cleanup(curl);
+		});
+
+		
+		for(const auto& header : headers)
+		{
+			auto data = header.first + ": "s + header.second;
+			header_list = curl_slist_append(header_list, data.c_str());
+		}
+		
+		std::string buffer{};
+		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header_list);
+		curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
+		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+		curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+		curl_easy_setopt(curl, CURLOPT_USERAGENT, "aw-installer/1.0");
+		curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1L);
+		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+
+		if (curl_easy_perform(curl) == CURLE_OK)
+		{
+			return {std::move(buffer)};
+		}
+
+		return {};
+	}
+
+	std::future<std::optional<std::string>> get_data_async(const std::string& url, const headers& headers)
+	{
+		return std::async(std::launch::async, [url, headers]() -> std::optional<std::string>
+		{
+			return get_data(url, headers);
+		});
+	}
+}

src/utils/http.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <future>
+#include <optional>
+#include <string>
+#include <unordered_map>
+
+namespace utils::http
+{
+	using headers = std::unordered_map<std::string, std::string>;
+
+	std::optional<std::string> get_data(const std::string& url, const headers& headers = {});
+	std::future<std::optional<std::string>> get_data_async(const std::string& url, const headers& headers = {});
+}

src/utils/io.cpp

@@ -0,0 +1,136 @@
+#include <std_include.hpp>
+
+#include "io.hpp"
+#include <fstream>
+#include <ios>
+
+namespace utils::io
+{
+	bool remove_file(const std::string& file)
+	{
+		return remove(file.c_str()) == 0;
+	}
+
+	bool move_file(const std::string& src, const std::string& target)
+	{
+		return rename(src.c_str(), target.c_str()) == 0;
+	}
+
+	bool file_exists(const std::string& file)
+	{
+		return std::ifstream(file).good();
+	}
+
+	bool write_file(const std::string& file, const std::string& data, const bool append)
+	{
+		const auto pos = file.find_last_of("/\\");
+		if (pos != std::string::npos)
+		{
+			create_directory(file.substr(0, pos));
+		}
+
+		auto mode = std::ios::binary | std::ofstream::out;
+		if (append)
+		{
+			mode |= std::ofstream::app;
+		}
+
+		std::ofstream stream(file, mode);
+
+		if (stream.is_open())
+		{
+			stream.write(data.data(), static_cast<std::streamsize>(data.size()));
+			stream.close();
+			return true;
+		}
+
+		return false;
+	}
+
+	std::string read_file(const std::string& file)
+	{
+		std::string data;
+		read_file(file, &data);
+		return data;
+	}
+
+	bool read_file(const std::string& file, std::string* data)
+	{
+		if (!data) return false;
+		data->clear();
+
+		if (file_exists(file))
+		{
+			std::ifstream stream(file, std::ios::binary);
+			if (!stream.is_open()) return false;
+
+			stream.seekg(0, std::ios::end);
+			const std::streamsize size = stream.tellg();
+			stream.seekg(0, std::ios::beg);
+
+			if (size > -1)
+			{
+				data->resize(static_cast<uint32_t>(size));
+				stream.read(const_cast<char*>(data->data()), size);
+				stream.close();
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	std::size_t file_size(const std::string& file)
+	{
+		if (file_exists(file))
+		{
+			std::ifstream stream(file, std::ios::binary);
+
+			if (stream.good())
+			{
+				stream.seekg(0, std::ios::end);
+				return static_cast<std::size_t>(stream.tellg());
+			}
+		}
+
+		return 0;
+	}
+
+	bool create_directory(const std::filesystem::path& directory)
+	{
+		std::error_code ec;
+		return std::filesystem::create_directories(directory, ec);
+	}
+
+	bool directory_exists(const std::filesystem::path& directory)
+	{
+		std::error_code ec;
+		return std::filesystem::is_directory(directory, ec);
+	}
+
+	bool directory_is_empty(const std::filesystem::path& directory)
+	{
+		std::error_code ec;
+		return std::filesystem::is_empty(directory, ec);
+	}
+
+	std::vector<std::string> list_files(const std::filesystem::path& directory)
+	{
+		std::vector<std::string> files;
+
+		for (auto& file : std::filesystem::directory_iterator(directory))
+		{
+			files.push_back(file.path().generic_string());
+		}
+
+		return files;
+	}
+
+	void copy_folder(const std::filesystem::path& src, const std::filesystem::path& target)
+	{
+		std::error_code ec;
+		std::filesystem::copy(src, target,
+		                      std::filesystem::copy_options::overwrite_existing |
+		                      std::filesystem::copy_options::recursive, ec);
+	}
+}

src/utils/io.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <filesystem>
+#include <string>
+#include <vector>
+
+namespace utils::io
+{
+	bool remove_file(const std::string& file);
+	bool move_file(const std::string& src, const std::string& target);
+	bool file_exists(const std::string& file);
+	bool write_file(const std::string& file, const std::string& data, bool append = false);
+	bool read_file(const std::string& file, std::string* data);
+	std::string read_file(const std::string& file);
+	std::size_t file_size(const std::string& file);
+	bool create_directory(const std::filesystem::path& directory);
+	bool directory_exists(const std::filesystem::path& directory);
+	bool directory_is_empty(const std::filesystem::path& directory);
+	std::vector<std::string> list_files(const std::filesystem::path& directory);
+	void copy_folder(const std::filesystem::path& src, const std::filesystem::path& target);
+}

src/utils/memory.cpp

@@ -0,0 +1,109 @@
+#include <std_include.hpp>
+
+#include "memory.hpp"
+
+namespace utils
+{
+	memory::allocator memory::mem_allocator_;
+
+	memory::allocator::~allocator()
+	{
+		this->clear();
+	}
+
+	void memory::allocator::clear()
+	{
+		std::lock_guard _(this->mutex_);
+
+		for (auto& data : this->pool_)
+		{
+			memory::free(data);
+		}
+
+		this->pool_.clear();
+	}
+
+	void memory::allocator::free(void* data)
+	{
+		std::lock_guard _(this->mutex_);
+
+		const auto j = std::find(this->pool_.begin(), this->pool_.end(), data);
+		if (j != this->pool_.end())
+		{
+			memory::free(data);
+			this->pool_.erase(j);
+		}
+	}
+
+	void memory::allocator::free(const void* data)
+	{
+		this->free(const_cast<void*>(data));
+	}
+
+	void* memory::allocator::allocate(const std::size_t length)
+	{
+		std::lock_guard _(this->mutex_);
+
+		const auto data = memory::allocate(length);
+		this->pool_.push_back(data);
+		return data;
+	}
+
+	bool memory::allocator::empty() const
+	{
+		return this->pool_.empty();
+	}
+
+	char* memory::allocator::duplicate_string(const std::string& string)
+	{
+		std::lock_guard _(this->mutex_);
+
+		const auto data = memory::duplicate_string(string);
+		this->pool_.push_back(data);
+		return data;
+	}
+
+	void* memory::allocate(const std::size_t length)
+	{
+		auto* buf = std::malloc(length);
+		std::memset(buf, 0, length);
+		return buf;
+	}
+
+	char* memory::duplicate_string(const std::string& string)
+	{
+		const auto new_string = allocate_array<char>(string.size() + 1);
+		std::memcpy(new_string, string.c_str(), string.size());
+		return new_string;
+	}
+
+	void memory::free(void* data)
+	{
+		::free(data);
+	}
+
+	void memory::free(const void* data)
+	{
+		free(const_cast<void*>(data));
+	}
+
+	bool memory::is_set(const void* mem, const char chr, const std::size_t length)
+	{
+		auto* const mem_arr = static_cast<const char*>(mem);
+
+		for (std::size_t i = 0; i < length; ++i)
+		{
+			if (mem_arr[i] != chr)
+			{
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	memory::allocator* memory::get_allocator()
+	{
+		return &memory::mem_allocator_;
+	}
+}

src/utils/memory.hpp

@@ -0,0 +1,71 @@
+#pragma once
+
+#include <mutex>
+#include <vector>
+
+namespace utils
+{
+	class memory final
+	{
+	public:
+		class allocator final
+		{
+		public:
+			~allocator();
+
+			void clear();
+
+			void free(void* data);
+
+			void free(const void* data);
+
+			void* allocate(std::size_t length);
+
+			template <typename T>
+			T* allocate()
+			{
+				return this->allocate_array<T>(1);
+			}
+
+			template <typename T>
+			T* allocate_array(const std::size_t count = 1)
+			{
+				return static_cast<T*>(this->allocate(count * sizeof(T)));
+			}
+
+			bool empty() const;
+
+			char* duplicate_string(const std::string& string);
+
+		private:
+			std::mutex mutex_;
+			std::vector<void*> pool_;
+		};
+
+		static void* allocate(std::size_t length);
+
+		template <typename T>
+		static T* allocate()
+		{
+			return allocate_array<T>(1);
+		}
+
+		template <typename T>
+		static T* allocate_array(const std::size_t count = 1)
+		{
+			return static_cast<T*>(allocate(count * sizeof(T)));
+		}
+
+		static char* duplicate_string(const std::string& string);
+
+		static void free(void* data);
+		static void free(const void* data);
+
+		static bool is_set(const void* mem, char chr, std::size_t length);
+
+		static allocator* get_allocator();
+
+	private:
+		static allocator mem_allocator_;
+	};
+}

src/utils/properties.cpp

@@ -0,0 +1,94 @@
+#include <std_include.hpp>
+
+#include "io.hpp"
+#include "properties.hpp"
+
+#include <rapidjson/document.h>
+#include <rapidjson/prettywriter.h>
+#include <rapidjson/stringbuffer.h>
+
+
+namespace utils::properties
+{
+	namespace
+	{
+		std::string get_properties_file()
+		{
+			return "properties.json";
+		}
+
+		rapidjson::Document load_properties()
+		{
+			rapidjson::Document default_doc{};
+			default_doc.SetObject();
+
+			std::string data{};
+			const auto& props = get_properties_file();
+			if (!io::read_file(props, &data))
+			{
+				return default_doc;
+			}
+
+			rapidjson::Document doc{};
+			const rapidjson::ParseResult result = doc.Parse(data);
+
+			if (!result || !doc.IsObject())
+			{
+				return default_doc;
+			}
+
+			return doc;
+		}
+
+		void store_properties(const rapidjson::Document& doc)
+		{
+			rapidjson::StringBuffer buffer{};
+			rapidjson::Writer<rapidjson::StringBuffer, rapidjson::Document::EncodingType, rapidjson::ASCII<>>
+				writer(buffer);
+			doc.Accept(writer);
+
+			const std::string json{ buffer.GetString(), buffer.GetLength() };
+
+			const auto& props = get_properties_file();
+			io::write_file(props, json);
+		}
+	}
+
+	std::optional<std::string> load(const std::string& name)
+	{
+		const auto doc = load_properties();
+
+		if (!doc.HasMember(name))
+		{
+			return {};
+		}
+
+		const auto& value = doc[name];
+		if (!value.IsString())
+		{
+			return {};
+		}
+
+		return { std::string{ value.GetString() } };
+	}
+
+	void store(const std::string& name, const std::string& value)
+	{
+		auto doc = load_properties();
+
+		while (doc.HasMember(name))
+		{
+			doc.RemoveMember(name);
+		}
+
+		rapidjson::Value key{};
+		key.SetString(name, doc.GetAllocator());
+
+		rapidjson::Value member{};
+		member.SetString(value, doc.GetAllocator());
+
+		doc.AddMember(key, member, doc.GetAllocator());
+
+		store_properties(doc);
+	}
+}

src/utils/properties.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <filesystem>
+#include <optional>
+
+namespace utils::properties
+{
+	std::optional<std::string> load(const std::string& name);
+	void store(const std::string& name, const std::string& value);
+}

src/utils/string.cpp

@@ -0,0 +1,102 @@
+#include <std_include.hpp>
+
+#include "string.hpp"
+#include <sstream>
+#include <cstdarg>
+#include <algorithm>
+
+namespace utils::string
+{
+	const char* va(const char* fmt, ...)
+	{
+		static thread_local va_provider<8, 256> provider;
+
+		va_list ap;
+		va_start(ap, fmt);
+
+		const char* result = provider.get(fmt, ap);
+
+		va_end(ap);
+		return result;
+	}
+
+	std::vector<std::string> split(const std::string& s, const char delim)
+	{
+		std::stringstream ss(s);
+		std::string item;
+		std::vector<std::string> elems;
+
+		while (std::getline(ss, item, delim))
+		{
+			elems.push_back(std::move(item));
+			item = std::string{};
+		}
+
+		return elems;
+	}
+
+	std::string to_lower(std::string text)
+	{
+		std::transform(text.begin(), text.end(), text.begin(), [](const unsigned char input)
+		{
+			return static_cast<char>(tolower(input));
+		});
+
+		return text;
+	}
+
+	std::string to_upper(std::string text)
+	{
+		std::transform(text.begin(), text.end(), text.begin(), [](const unsigned char input)
+		{
+			return static_cast<char>(toupper(input));
+		});
+
+		return text;
+	}
+
+	bool starts_with(const std::string& text, const std::string& substring)
+	{
+		return text.find(substring) == 0;
+	}
+
+	bool ends_with(const std::string& text, const std::string& substring)
+	{
+		if (substring.size() > text.size()) return false;
+		return std::equal(substring.rbegin(), substring.rend(), text.rbegin());
+	}
+
+	std::string dump_hex(const std::string& data, const std::string& separator)
+	{
+		std::string result;
+
+		for (unsigned int i = 0; i < data.size(); ++i)
+		{
+			if (i > 0)
+			{
+				result.append(separator);
+			}
+
+			result.append(va("%02X", data[i] & 0xFF));
+		}
+
+		return result;
+	}
+
+	std::string replace(std::string str, const std::string& from, const std::string& to)
+	{
+		if (from.empty())
+		{
+			return str;
+		}
+
+		std::size_t start_pos = 0;
+		while ((start_pos = str.find(from, start_pos)) != std::string::npos)
+		{
+			str.replace(start_pos, from.length(), to);
+			start_pos += to.length();
+		}
+
+		return str;
+	}
+}

src/utils/string.hpp

@@ -0,0 +1,97 @@
+#pragma once
+#include "memory.hpp"
+#include <cstdint>
+
+template <class Type, std::size_t n>
+constexpr std::size_t ARRAY_COUNT(Type(&)[n]) { return n; }
+
+namespace utils::string
+{
+	template <std::size_t buffers, std::size_t min_buffer_size>
+	class va_provider final
+	{
+	public:
+		static_assert(buffers != 0 && min_buffer_size != 0, "buffers and min_buffer_size mustn't be 0");
+
+		va_provider() : current_buffer_(0)
+		{
+		}
+
+		char* get(const char* format, va_list ap)
+		{
+			++this->current_buffer_ %= ARRAY_COUNT(this->string_pool_);
+			auto entry = &this->string_pool_[this->current_buffer_];
+
+			if (!entry->size_ || !entry->buffer_)
+			{
+				throw std::runtime_error("String pool not initialized");
+			}
+
+			while (true)
+			{
+#ifdef _WIN32
+				const auto res = vsnprintf_s(entry->buffer_, entry->size_, _TRUNCATE, format, ap);
+#else
+				const auto res = vsnprintf(entry->buffer_, entry->size_, format, ap);
+#endif
+
+				if (res > 0) break; // Success
+				if (res == 0) return nullptr; // Error
+
+				entry->double_size();
+			}
+
+			return entry->buffer_;
+		}
+
+	private:
+		class entry final
+		{
+		public:
+			explicit entry(const std::size_t size = min_buffer_size) : size_(size), buffer_(nullptr)
+			{
+				if (this->size_ < min_buffer_size) this->size_ = min_buffer_size;
+				this->allocate();
+			}
+
+			~entry()
+			{
+				if (this->buffer_) memory::get_allocator()->free(this->buffer_);
+				this->size_ = 0;
+				this->buffer_ = nullptr;
+			}
+
+			void allocate()
+			{
+				if (this->buffer_) memory::get_allocator()->free(this->buffer_);
+				this->buffer_ = memory::get_allocator()->allocate_array<char>(this->size_ + 1);
+			}
+
+			void double_size()
+			{
+				this->size_ *= 2;
+				this->allocate();
+			}
+
+			std::size_t size_;
+			char* buffer_;
+		};
+
+		std::size_t current_buffer_;
+		entry string_pool_[buffers];
+	};
+
+	const char* va(const char* fmt, ...);
+
+	std::vector<std::string> split(const std::string& s, char delim);
+
+	std::string to_lower(std::string text);
+	std::string to_upper(std::string text);
+
+	bool starts_with(const std::string& text, const std::string& substring);
+	bool ends_with(const std::string& text, const std::string& substring);
+
+	std::string dump_hex(const std::string& data, const std::string& separator = " ");
+
+	std::string replace(std::string str, const std::string& from, const std::string& to);
+}