use string_view in ExtractString and PutString

libi2pd_client/I2CP.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <inttypes.h>
 #include <string>
+#include <string_view>
 #include <memory>
 #include <mutex>
 #include <thread>
@@ -191,8 +192,8 @@ namespace client
 
 			void HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 
-			std::string ExtractString (const uint8_t * buf, size_t len);
-			size_t PutString (uint8_t * buf, size_t len, const std::string& str);
+			std::string_view ExtractString (const uint8_t * buf, size_t len);
+			size_t PutString (uint8_t * buf, size_t len, std::string_view str);
 			void ExtractMapping (const uint8_t * buf, size_t len, std::map<std::string, std::string>& mapping);
 			void SendSessionStatusMessage (I2CPSessionStatus status);
 			void SendHostReplyMessage (uint32_t requestID, std::shared_ptr<const i2p::data::IdentityEx> identity);