linux-kernel - Re: [PATCH RESEND] rust: transmute: add `from_bytes

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Message-ID: <aQoJv3k8sJvbWaF9@google.com>
Date: Tue, 4 Nov 2025 14:12:15 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] rust: transmute: add `from_bytes_prefix` family of methods

On Sat, Nov 01, 2025 at 10:41:21PM +0900, Alexandre Courbot wrote:
> The `from_bytes*` family of functions expect a slice of the exact same
> size as the requested type. This can be sometimes cumbersome for callers
> that deal with dynamic stream of data that needs to be manually cut
> before each invocation of `from_bytes`.
> 
> To simplify such callers, introduce a new `from_bytes*_prefix` family of
> methods, which split the input slice at the index required for the
> equivalent `from_bytes` method to succeed, and return its result
> alongside with the remainder of the slice.
> 
> This design is inspired by zerocopy's `try_*_from_prefix` family of
> methods.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>