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skip UTF8 checking and initialize with b'.'

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This commit is contained in:
Ben Kimock 2021-03-22 18:15:50 -04:00
parent ba8c1d63c8
commit 8bb07b0743
2 changed files with 5 additions and 9 deletions
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1
serde/src/lib.rs
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@ -139,7 +139,6 @@
) )
)] )]
// Rustc lints. // Rustc lints.
#![forbid(unsafe_code)]
#![deny(missing_docs, unused_imports)] #![deny(missing_docs, unused_imports)]
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////

13
serde/src/ser/impls.rs
View File

@ -683,7 +683,6 @@ const DEC_DIGITS_LUT: &'static [u8] = b"\
#[inline] #[inline]
fn format_u8(mut n: u8, out: &mut [u8]) -> usize { fn format_u8(mut n: u8, out: &mut [u8]) -> usize {
assert!(out.len() >= 3);
if n >= 100 { if n >= 100 {
let d1 = ((n % 100) << 1) as usize; let d1 = ((n % 100) << 1) as usize;
n /= 100; n /= 100;
@ -723,15 +722,13 @@ impl Serialize for net::Ipv4Addr {
if serializer.is_human_readable() { if serializer.is_human_readable() {
const MAX_LEN: usize = 15; const MAX_LEN: usize = 15;
debug_assert_eq!(MAX_LEN, "101.102.103.104".len()); debug_assert_eq!(MAX_LEN, "101.102.103.104".len());
let mut buf = [0u8; MAX_LEN]; let mut buf = [b'.'; MAX_LEN];
let mut written = 0; let mut written = format_u8(self.octets()[0], &mut buf);
written += format_u8(self.octets()[0], &mut buf);
for oct in &self.octets()[1..] { for oct in &self.octets()[1..] {
buf[written] = b'.'; written += format_u8(*oct, &mut buf[written..]) + 1;
written += 1;
written += format_u8(*oct, &mut buf[written..]);
} }
serializer.serialize_str(str::from_utf8(&buf[..written]).unwrap()) // We've only written ASCII bytes to the buffer, so it is valid UTF-8
serializer.serialize_str(unsafe { str::from_utf8_unchecked(&buf[..written]) })
} else { } else {
self.octets().serialize(serializer) self.octets().serialize(serializer)
} }