common: fs: fs_util: Add more string conversion functions

src/common/fs/fs_util.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <algorithm>
+
 #include "common/fs/fs_util.h"
 
 namespace Common::FS {
@@ -10,4 +12,12 @@ std::u8string ToU8String(std::string_view utf8_string) {
     return std::u8string{utf8_string.begin(), utf8_string.end()};
 }
 
+std::u8string BufferToU8String(std::span<const u8> buffer) {
+    return std::u8string{buffer.begin(), std::ranges::find(buffer, u8{0})};
+}
+
+std::string ToUTF8String(std::u8string_view u8_string) {
+    return std::string{u8_string.begin(), u8_string.end()};
+}
+
 } // namespace Common::FS