diff options
| -rw-r--r-- | tvix/nix-compat/src/wire/bytes/mod.rs | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/tvix/nix-compat/src/wire/bytes/mod.rs b/tvix/nix-compat/src/wire/bytes/mod.rs index 436667731815..031d969e287f 100644 --- a/tvix/nix-compat/src/wire/bytes/mod.rs +++ b/tvix/nix-compat/src/wire/bytes/mod.rs @@ -119,14 +119,10 @@ pub async fn write_bytes<W: AsyncWriteExt + Unpin, B: AsRef<[u8]>>( } /// Computes the number of bytes we should add to len (a length in -/// bytes) to be alined on 64 bits (8 bytes). +/// bytes) to be aligned on 64 bits (8 bytes). fn padding_len(len: u64) -> u8 { - let modulo = len % 8; - if modulo == 0 { - 0 - } else { - 8 - modulo as u8 - } + let aligned = len.wrapping_add(7) & !7; + aligned.wrapping_sub(len) as u8 } #[cfg(test)] @@ -229,4 +225,9 @@ mod tests { .build(); assert_ok!(write_bytes(&mut mock, &input).await) } + + #[test] + fn padding_len_u64_max() { + assert_eq!(padding_len(u64::MAX), 1); + } } |