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swapping the endianness of int arrays -- checking if a string is plain ascii for faster mutf8 to utf8 conversion +- checking if a string is plain ascii for faster MUTF-8 to UTF-8 conversion Simdnbt ~~cheats~~ takes some shortcuts to be this fast: 1. it requires a reference to the original data (to avoid cloning) -2. it doesn't validate/decode the mutf-8 strings at decode-time +2. it doesn't validate/decode the MUTF-8 strings at decode-time ## Benchmarks diff --git a/simdnbt/src/mutf8.rs b/simdnbt/src/mutf8.rs index 25818ce..408b187 100644 --- a/simdnbt/src/mutf8.rs +++ b/simdnbt/src/mutf8.rs @@ -7,12 +7,14 @@ use std::{ simd::prelude::*, }; -/// A M-UTF8 string slice. This is how strings are represented internally in NBT. +use simd_cesu8::mutf8; + +/// A MUTF-8 string slice. This is how strings are represented internally in NBT. #[derive(Eq, PartialEq)] pub struct Mutf8Str { pub(crate) slice: [u8], } -/// An owned M-UTF8 string. +/// An owned MUTF-8 string. #[derive(Eq, PartialEq, Clone, Default)] pub struct Mutf8String { pub(crate) vec: Vec, @@ -29,8 +31,8 @@ fn is_plain_ascii(slice: &[u8]) -> bool { let mask = u8x16::splat(0b10000000); let zero = u8x16::splat(0); let simd = u8x16::from_array(*chunk); - let and = simd & mask; - if and != zero { + let masked = simd & mask; + if masked != zero { is_plain_ascii = false; } } @@ -40,8 +42,8 @@ fn is_plain_ascii(slice: &[u8]) -> bool { let mask = u8x8::splat(0b10000000); let zero = u8x8::splat(0); let simd = u8x8::from_array(*chunk); - let and = simd & mask; - if and != zero { + let masked = simd & mask; + if masked != zero { is_plain_ascii = false; } } @@ -51,8 +53,8 @@ fn is_plain_ascii(slice: &[u8]) -> bool { let mask = u8x4::splat(0b10000000); let zero = u8x4::splat(0); let simd = u8x4::from_array(*chunk); - let and = simd & mask; - if and != zero { + let masked = simd & mask; + if masked != zero { is_plain_ascii = false; } } @@ -66,8 +68,8 @@ fn is_plain_ascii(slice: &[u8]) -> bool { let mask = u8x32::splat(0b10000000); let zero = u8x32::splat(0); let simd = u8x32::from_array(chunk); - let and = simd & mask; - if and != zero { + let masked = simd & mask; + if masked != zero { is_plain_ascii = false; } } @@ -76,17 +78,6 @@ fn is_plain_ascii(slice: &[u8]) -> bool { } impl Mutf8Str { - #[inline] - pub fn to_string_lossy(&self) -> Cow { - String::from_utf8_lossy(&self.slice) - } - - #[inline] - pub fn from_slice(slice: &[u8]) -> &Mutf8Str { - // SAFETY: &[u8] and &Mutf8Str are the same layout. - unsafe { mem::transmute::<&[u8], &Mutf8Str>(slice) } - } - // we can't implement FromStr on Cow #[allow(clippy::should_implement_trait)] #[inline] @@ -97,21 +88,37 @@ impl Mutf8Str { } } + /// Try to convert this MUTF-8 string into a UTF-8 string. If the data isn't + /// valid MUTF-8, it'll return an empty string without erroring. #[inline] pub fn to_str(&self) -> Cow { - // fast check to skip if none of the bytes have the top bit set + // fast check to skip if none of the bytes have the top bit set. + // note that this allows some valid utf8 but invalid mutf8 through as + // null bytes aren't allowed in mutf8. if is_plain_ascii(&self.slice) { - // SAFETY: &[u8] and &str are the same layout. + // SAFETY: Plain ASCII is always valid UTF-8. unsafe { Cow::Borrowed(std::str::from_utf8_unchecked(&self.slice)) } } else { - match mutf8::decode(&self.slice) { - Ok(Cow::Borrowed(b)) => Cow::Borrowed(b), - Ok(Cow::Owned(o)) => Cow::Owned(o), - Err(_) => Cow::Borrowed(""), - } + // we use the non-strict variant as it's apparently significantly + // faster and our is_plain_ascii check makes it non-strict already + // anyways. + mutf8::decode(&self.slice).unwrap_or_default() } } + #[inline] + pub fn to_string_lossy(&self) -> Cow { + mutf8::decode_lossy(&self.slice) + } + + /// Convert a slice of bytes into a Mutf8Str. This is safe because it's only + /// checked to be valid MUTF-8 while being converted to UTF-8. + #[inline] + pub fn from_slice(slice: &[u8]) -> &Mutf8Str { + // SAFETY: &[u8] and &Mutf8Str are the same layout. + unsafe { mem::transmute::<&[u8], &Mutf8Str>(slice) } + } + #[inline] pub fn len(&self) -> usize { self.slice.len() @@ -174,34 +181,27 @@ impl Mutf8String { Mutf8Str::from_slice(self.vec.as_slice()) } + /// Try to convert this MUTF-8 string into a UTF-8 string. If the data isn't + /// valid MUTF-8, it'll return an empty string without erroring. #[inline] pub fn into_string(self) -> String { if is_plain_ascii(&self.vec) { // SAFETY: &[u8] and &str are the same layout. unsafe { String::from_utf8_unchecked(self.vec) } } else { - match mutf8::decode(&self.vec) { - Ok(Cow::Borrowed(b)) => b.to_owned(), - Ok(Cow::Owned(o)) => o, - Err(_) => String::new(), - } + mutf8::decode(&self.vec).unwrap_or_default().to_string() } } - #[inline] - pub fn len(&self) -> usize { - self.vec.len() - } - - #[inline] - pub fn from_vec(vec: Vec) -> Mutf8String { - Self { vec } - } - #[inline] pub fn from_string(s: String) -> Mutf8String { Self::from_vec(mutf8::encode(&s).into_owned()) } + + #[inline] + pub fn from_vec(vec: Vec) -> Mutf8String { + Self { vec } + } } impl Deref for Mutf8String { type Target = Mutf8Str;