Update README and IPv6 preparations

include/columnlynx/common/utils.hpp

@@ -13,6 +13,7 @@
 #include <fstream>
 #include <chrono>
 #include <unordered_map>
+#include <algorithm>
 
 #ifdef _WIN32
     #include <winsock2.h>
@@ -22,6 +23,10 @@
     #include <unistd.h>
 #endif
 
+namespace ColumnLynx {
+    using IPv6Addr = std::array<uint8_t, 16>;
+}
+
 namespace ColumnLynx::Utils {
     // General log function. Use for logging important information.
     void log(const std::string &msg);
@@ -76,6 +81,18 @@ namespace ColumnLynx::Utils {
         return cbswap64(x);
     }
 
+    template <typename T>
+    T cbswap128(const T& x) {
+        static_assert(sizeof(T) == 16, "cbswap128 requires a 128-bit type");
+
+        T out{};
+        const uint8_t* src = reinterpret_cast<const uint8_t*>(&x);
+        uint8_t* dst = reinterpret_cast<uint8_t*>(&out);
+        std::reverse_copy(src, src + 16, dst);
+
+        return out;
+    }
+
     // Returns the config file in an unordered_map format. This purely reads the config file, you still need to parse it manually.
     std::unordered_map<std::string, std::string> getConfigMap(std::string path);
 };