Mark all possible functions const

Author: ctz

src/base64.rs

@@ -203,7 +203,7 @@ impl CodePoint {
         )
     }
 
-    fn decode_public(a: u8) -> Self {
+    const fn decode_public(a: u8) -> Self {
         const TABLE: [CodePoint; 256] = [
             // 0x00..0x0f
             CodePoint::INVALID,
@@ -502,21 +502,21 @@ fn u8_less_than(a: u8, b: u8) -> u8 {
 }
 
 /// Returns 0xff if a == b, 0 otherwise.
-fn u8_equals(a: u8, b: u8) -> u8 {
+const fn u8_equals(a: u8, b: u8) -> u8 {
     let diff = a ^ b;
     u8_nonzero(diff)
 }
 
 /// Returns 0xff if a != 0, 0 otherwise.
-fn u8_nonzero(x: u8) -> u8 {
+const fn u8_nonzero(x: u8) -> u8 {
     u8_broadcast8(!x & x.wrapping_sub(1))
 }
 
 /// Broadcasts the top bit of `x`
 ///
 /// In other words, if the top bit of `x` is set,
 /// returns 0xff else 0x00.
-fn u8_broadcast8(x: u8) -> u8 {
+const fn u8_broadcast8(x: u8) -> u8 {
     let msb = x >> 7;
     0u8.wrapping_sub(msb)
 }
@@ -525,7 +525,7 @@ fn u8_broadcast8(x: u8) -> u8 {
 ///
 /// In other words, if the top bit of `x` is set,
 /// returns 0xff else 0x00.
-fn u8_broadcast16(x: u16) -> u8 {
+const fn u8_broadcast16(x: u16) -> u8 {
     let msb = x >> 15;
     0u8.wrapping_sub(msb as u8)
 }

src/lib.rs

@@ -959,12 +959,12 @@ impl UnixTime {
     /// Convert a `Duration` since the start of 1970 to a `UnixTime`
     ///
     /// The `duration` must be relative to the Unix epoch.
-    pub fn since_unix_epoch(duration: Duration) -> Self {
+    pub const fn since_unix_epoch(duration: Duration) -> Self {
         Self(duration.as_secs())
     }
 
     /// Number of seconds since the Unix epoch
-    pub fn as_secs(&self) -> u64 {
+    pub const fn as_secs(&self) -> u64 {
         self.0
     }
 }

src/pem.rs

@@ -107,7 +107,7 @@ pub struct ReadIter<R, T> {
 #[cfg(feature = "std")]
 impl<R: io::BufRead, T: PemObject> ReadIter<R, T> {
     /// Create a new iterator.
-    pub fn new(rd: R) -> Self {
+    pub const fn new(rd: R) -> Self {
         Self {
             rd,
             _ty: PhantomData,
@@ -141,7 +141,7 @@ pub struct SliceIter<'a, T> {
 
 impl<'a, T: PemObject> SliceIter<'a, T> {
     /// Create a new iterator.
-    pub fn new(current: &'a [u8]) -> Self {
+    pub const fn new(current: &'a [u8]) -> Self {
         Self {
             current,
             _ty: PhantomData,
@@ -153,7 +153,7 @@ impl<'a, T: PemObject> SliceIter<'a, T> {
     /// This is the slice immediately following the most
     /// recently returned item from `next()`.
     #[doc(hidden)]
-    pub fn remainder(&self) -> &'a [u8] {
+    pub const fn remainder(&self) -> &'a [u8] {
         self.current
     }
 }
@@ -371,7 +371,7 @@ pub enum SectionKind {
 }
 
 impl SectionKind {
-    fn secret(&self) -> bool {
+    const fn secret(&self) -> bool {
         match self {
             Self::RsaPrivateKey | Self::PrivateKey | Self::EcPrivateKey => true,
             Self::Certificate | Self::PublicKey | Self::Crl | Self::Csr | Self::EchConfigList => {

src/server_name.rs

@@ -542,7 +542,7 @@ mod parser {
     }
 
     impl<'a> Parser<'a> {
-        pub(super) fn new(input: &'a [u8]) -> Self {
+        pub(super) const fn new(input: &'a [u8]) -> Self {
             Parser { state: input }
         }