Hi Ayush,

In the latest UEFI 2.9 spec, it's specified under 2.3.1 that CHAR8 strings/characters are (usually) ASCII, and CHAR16 strings/characters are (usually) UCS-2 (*not* UTF-16).

On Tue, Jun 7, 2022 at 7:02 AM Ayush Singh <ayushdevel1325@gmail.com> wrote:
Hello everyone, I am trying to write an implementation for UEFI
strings in Rust and just wanted clarification about some things.

Are UEFI Strings UTF-16 encoded? I have looked at some previous Rust
implementations for this and it seems UEFI does not support the whole
UTF-16 but rather only UCS-2
(https://en.wikipedia.org/wiki/Universal_Coded_Character_Set) which is
a subset of UTF-16.

There is also something called WTF-8
(https://en.wikipedia.org/wiki/UTF-8#WTF-8) which Rust uses to
represent OsStrings in Windows which is supposed to use UTF-16 (?).

Anyway, if someone can point me to the resources/specifications of
UEFI Strings, it would be a great help.

Ayush Singh







--
Pedro Falcato