Rename Buf/BufMut, methods to chunk/chunk_mut (#450)

The `bytes()` / `bytes_mut()` name implies the method returns the full
set of bytes represented by `Buf`/`BufMut`. To rectify this, the methods
are renamed to `chunk()` and `chunk_mut()` to reflect the partial nature
of the returned byte slice.

`bytes_vectored()` is renamed `chunks_vectored()`.

Closes #447

.github/workflows/ci.yml

@@ -11,6 +11,7 @@ on:
 env:
   RUSTFLAGS: -Dwarnings
   RUST_BACKTRACE: 1
+  nightly: nightly-2020-12-17
 
 defaults:
   run:
@@ -120,7 +121,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Install Rust
-        run: rustup update nightly && rustup default nightly
+        run: rustup update $nightly && rustup default $nightly
       - name: Install rust-src
         run: rustup component add rust-src
       - name: ASAN / TSAN

benches/buf.rs

@@ -53,7 +53,7 @@ impl Buf for TestBuf {
         assert!(self.pos <= self.buf.len());
         self.next_readlen();
     }
-    fn bytes(&self) -> &[u8] {
+    fn chunk(&self) -> &[u8] {
         if self.readlen == 0 {
             Default::default()
         } else {
@@ -87,8 +87,8 @@ impl Buf for TestBufC {
         self.inner.advance(cnt)
     }
     #[inline(never)]
-    fn bytes(&self) -> &[u8] {
-        self.inner.bytes()
+    fn chunk(&self) -> &[u8] {
+        self.inner.chunk()
     }
 }
 

src/buf/buf_impl.rs

@@ -16,7 +16,7 @@ macro_rules! buf_get_impl {
         // this Option<ret> trick is to avoid keeping a borrow on self
         // when advance() is called (mut borrow) and to call bytes() only once
         let ret = $this
-            .bytes()
+            .chunk()
             .get(..SIZE)
             .map(|src| unsafe { $typ::$conv(*(src as *const _ as *const [_; SIZE])) });
 
@@ -78,7 +78,7 @@ pub trait Buf {
     /// the buffer.
     ///
     /// This value is greater than or equal to the length of the slice returned
-    /// by `bytes`.
+    /// by `chunk()`.
     ///
     /// # Examples
     ///
@@ -115,31 +115,31 @@ pub trait Buf {
     ///
     /// let mut buf = &b"hello world"[..];
     ///
-    /// assert_eq!(buf.bytes(), &b"hello world"[..]);
+    /// assert_eq!(buf.chunk(), &b"hello world"[..]);
     ///
     /// buf.advance(6);
     ///
-    /// assert_eq!(buf.bytes(), &b"world"[..]);
+    /// assert_eq!(buf.chunk(), &b"world"[..]);
     /// ```
     ///
     /// # Implementer notes
     ///
     /// This function should never panic. Once the end of the buffer is reached,
-    /// i.e., `Buf::remaining` returns 0, calls to `bytes` should return an
+    /// i.e., `Buf::remaining` returns 0, calls to `chunk()` should return an
     /// empty slice.
-    fn bytes(&self) -> &[u8];
+    fn chunk(&self) -> &[u8];
 
     /// Fills `dst` with potentially multiple slices starting at `self`'s
     /// current position.
     ///
-    /// If the `Buf` is backed by disjoint slices of bytes, `bytes_vectored` enables
+    /// If the `Buf` is backed by disjoint slices of bytes, `chunk_vectored` enables
     /// fetching more than one slice at once. `dst` is a slice of `IoSlice`
     /// references, enabling the slice to be directly used with [`writev`]
     /// without any further conversion. The sum of the lengths of all the
     /// buffers in `dst` will be less than or equal to `Buf::remaining()`.
     ///
     /// The entries in `dst` will be overwritten, but the data **contained** by
-    /// the slices **will not** be modified. If `bytes_vectored` does not fill every
+    /// the slices **will not** be modified. If `chunk_vectored` does not fill every
     /// entry in `dst`, then `dst` is guaranteed to contain all remaining slices
     /// in `self.
     ///
@@ -149,21 +149,21 @@ pub trait Buf {
     /// # Implementer notes
     ///
     /// This function should never panic. Once the end of the buffer is reached,
-    /// i.e., `Buf::remaining` returns 0, calls to `bytes_vectored` must return 0
+    /// i.e., `Buf::remaining` returns 0, calls to `chunk_vectored` must return 0
     /// without mutating `dst`.
     ///
     /// Implementations should also take care to properly handle being called
     /// with `dst` being a zero length slice.
     ///
     /// [`writev`]: http://man7.org/linux/man-pages/man2/readv.2.html
     #[cfg(feature = "std")]
-    fn bytes_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
+    fn chunks_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
         if dst.is_empty() {
             return 0;
         }
 
         if self.has_remaining() {
-            dst[0] = IoSlice::new(self.bytes());
+            dst[0] = IoSlice::new(self.chunk());
             1
         } else {
             0
@@ -172,7 +172,7 @@ pub trait Buf {
 
     /// Advance the internal cursor of the Buf
     ///
-    /// The next call to `bytes` will return a slice starting `cnt` bytes
+    /// The next call to `chunk()` will return a slice starting `cnt` bytes
     /// further into the underlying buffer.
     ///
     /// # Examples
@@ -182,11 +182,11 @@ pub trait Buf {
     ///
     /// let mut buf = &b"hello world"[..];
     ///
-    /// assert_eq!(buf.bytes(), &b"hello world"[..]);
+    /// assert_eq!(buf.chunk(), &b"hello world"[..]);
     ///
     /// buf.advance(6);
     ///
-    /// assert_eq!(buf.bytes(), &b"world"[..]);
+    /// assert_eq!(buf.chunk(), &b"world"[..]);
     /// ```
     ///
     /// # Panics
@@ -253,7 +253,7 @@ pub trait Buf {
             let cnt;
 
             unsafe {
-                let src = self.bytes();
+                let src = self.chunk();
                 cnt = cmp::min(src.len(), dst.len() - off);
 
                 ptr::copy_nonoverlapping(src.as_ptr(), dst[off..].as_mut_ptr(), cnt);
@@ -283,7 +283,7 @@ pub trait Buf {
     /// This function panics if there is no more remaining data in `self`.
     fn get_u8(&mut self) -> u8 {
         assert!(self.remaining() >= 1);
-        let ret = self.bytes()[0];
+        let ret = self.chunk()[0];
         self.advance(1);
         ret
     }
@@ -306,7 +306,7 @@ pub trait Buf {
     /// This function panics if there is no more remaining data in `self`.
     fn get_i8(&mut self) -> i8 {
         assert!(self.remaining() >= 1);
-        let ret = self.bytes()[0] as i8;
+        let ret = self.chunk()[0] as i8;
         self.advance(1);
         ret
     }
@@ -861,7 +861,7 @@ pub trait Buf {
     /// let mut chain = b"hello "[..].chain(&b"world"[..]);
     ///
     /// let full = chain.copy_to_bytes(11);
-    /// assert_eq!(full.bytes(), b"hello world");
+    /// assert_eq!(full.chunk(), b"hello world");
     /// ```
     fn chain<U: Buf>(self, next: U) -> Chain<Self, U>
     where
@@ -908,13 +908,13 @@ macro_rules! deref_forward_buf {
             (**self).remaining()
         }
 
-        fn bytes(&self) -> &[u8] {
-            (**self).bytes()
+        fn chunk(&self) -> &[u8] {
+            (**self).chunk()
         }
 
         #[cfg(feature = "std")]
-        fn bytes_vectored<'b>(&'b self, dst: &mut [IoSlice<'b>]) -> usize {
-            (**self).bytes_vectored(dst)
+        fn chunks_vectored<'b>(&'b self, dst: &mut [IoSlice<'b>]) -> usize {
+            (**self).chunks_vectored(dst)
         }
 
         fn advance(&mut self, cnt: usize) {
@@ -1022,7 +1022,7 @@ impl Buf for &[u8] {
     }
 
     #[inline]
-    fn bytes(&self) -> &[u8] {
+    fn chunk(&self) -> &[u8] {
         self
     }
 
@@ -1045,7 +1045,7 @@ impl<T: AsRef<[u8]>> Buf for std::io::Cursor<T> {
         len - pos as usize
     }
 
-    fn bytes(&self) -> &[u8] {
+    fn chunk(&self) -> &[u8] {
         let len = self.get_ref().as_ref().len();
         let pos = self.position();
 

src/buf/buf_mut.rs

@@ -31,7 +31,7 @@ pub unsafe trait BufMut {
     /// position until the end of the buffer is reached.
     ///
     /// This value is greater than or equal to the length of the slice returned
-    /// by `bytes_mut`.
+    /// by `chunk_mut()`.
     ///
     /// # Examples
     ///
@@ -56,7 +56,7 @@ pub unsafe trait BufMut {
 
     /// Advance the internal cursor of the BufMut
     ///
-    /// The next call to `bytes_mut` will return a slice starting `cnt` bytes
+    /// The next call to `chunk_mut` will return a slice starting `cnt` bytes
     /// further into the underlying buffer.
     ///
     /// This function is unsafe because there is no guarantee that the bytes
@@ -70,11 +70,11 @@ pub unsafe trait BufMut {
     /// let mut buf = Vec::with_capacity(16);
     ///
     /// // Write some data
-    /// buf.bytes_mut()[0..2].copy_from_slice(b"he");
+    /// buf.chunk_mut()[0..2].copy_from_slice(b"he");
     /// unsafe { buf.advance_mut(2) };
     ///
     /// // write more bytes
-    /// buf.bytes_mut()[0..3].copy_from_slice(b"llo");
+    /// buf.chunk_mut()[0..3].copy_from_slice(b"llo");
     ///
     /// unsafe { buf.advance_mut(3); }
     ///
@@ -135,14 +135,14 @@ pub unsafe trait BufMut {
     ///
     /// unsafe {
     ///     // MaybeUninit::as_mut_ptr
-    ///     buf.bytes_mut()[0..].as_mut_ptr().write(b'h');
-    ///     buf.bytes_mut()[1..].as_mut_ptr().write(b'e');
+    ///     buf.chunk_mut()[0..].as_mut_ptr().write(b'h');
+    ///     buf.chunk_mut()[1..].as_mut_ptr().write(b'e');
     ///
     ///     buf.advance_mut(2);
     ///
-    ///     buf.bytes_mut()[0..].as_mut_ptr().write(b'l');
-    ///     buf.bytes_mut()[1..].as_mut_ptr().write(b'l');
-    ///     buf.bytes_mut()[2..].as_mut_ptr().write(b'o');
+    ///     buf.chunk_mut()[0..].as_mut_ptr().write(b'l');
+    ///     buf.chunk_mut()[1..].as_mut_ptr().write(b'l');
+    ///     buf.chunk_mut()[2..].as_mut_ptr().write(b'o');
     ///
     ///     buf.advance_mut(3);
     /// }
@@ -153,12 +153,12 @@ pub unsafe trait BufMut {
     ///
     /// # Implementer notes
     ///
-    /// This function should never panic. `bytes_mut` should return an empty
-    /// slice **if and only if** `remaining_mut` returns 0. In other words,
-    /// `bytes_mut` returning an empty slice implies that `remaining_mut` will
-    /// return 0 and `remaining_mut` returning 0 implies that `bytes_mut` will
+    /// This function should never panic. `chunk_mut` should return an empty
+    /// slice **if and only if** `remaining_mut()` returns 0. In other words,
+    /// `chunk_mut()` returning an empty slice implies that `remaining_mut()` will
+    /// return 0 and `remaining_mut()` returning 0 implies that `chunk_mut()` will
     /// return an empty slice.
-    fn bytes_mut(&mut self) -> &mut UninitSlice;
+    fn chunk_mut(&mut self) -> &mut UninitSlice;
 
     /// Transfer bytes into `self` from `src` and advance the cursor by the
     /// number of bytes written.
@@ -190,8 +190,8 @@ pub unsafe trait BufMut {
             let l;
 
             unsafe {
-                let s = src.bytes();
-                let d = self.bytes_mut();
+                let s = src.chunk();
+                let d = self.chunk_mut();
                 l = cmp::min(s.len(), d.len());
 
                 ptr::copy_nonoverlapping(s.as_ptr(), d.as_mut_ptr() as *mut u8, l);
@@ -237,7 +237,7 @@ pub unsafe trait BufMut {
             let cnt;
 
             unsafe {
-                let dst = self.bytes_mut();
+                let dst = self.chunk_mut();
                 cnt = cmp::min(dst.len(), src.len() - off);
 
                 ptr::copy_nonoverlapping(src[off..].as_ptr(), dst.as_mut_ptr() as *mut u8, cnt);
@@ -913,8 +913,8 @@ macro_rules! deref_forward_bufmut {
             (**self).remaining_mut()
         }
 
-        fn bytes_mut(&mut self) -> &mut UninitSlice {
-            (**self).bytes_mut()
+        fn chunk_mut(&mut self) -> &mut UninitSlice {
+            (**self).chunk_mut()
         }
 
         unsafe fn advance_mut(&mut self, cnt: usize) {
@@ -998,7 +998,7 @@ unsafe impl BufMut for &mut [u8] {
     }
 
     #[inline]
-    fn bytes_mut(&mut self) -> &mut UninitSlice {
+    fn chunk_mut(&mut self) -> &mut UninitSlice {
         // UninitSlice is repr(transparent), so safe to transmute
         unsafe { &mut *(*self as *mut [u8] as *mut _) }
     }
@@ -1033,7 +1033,7 @@ unsafe impl BufMut for Vec<u8> {
     }
 
     #[inline]
-    fn bytes_mut(&mut self) -> &mut UninitSlice {
+    fn chunk_mut(&mut self) -> &mut UninitSlice {
         if self.capacity() == self.len() {
             self.reserve(64); // Grow the vec
         }
@@ -1060,7 +1060,7 @@ unsafe impl BufMut for Vec<u8> {
 
             // a block to contain the src.bytes() borrow
             {
-                let s = src.bytes();
+                let s = src.chunk();
                 l = s.len();
                 self.extend_from_slice(s);
             }

src/buf/chain.rs

@@ -138,11 +138,11 @@ where
         self.a.remaining() + self.b.remaining()
     }
 
-    fn bytes(&self) -> &[u8] {
+    fn chunk(&self) -> &[u8] {
         if self.a.has_remaining() {
-            self.a.bytes()
+            self.a.chunk()
         } else {
-            self.b.bytes()
+            self.b.chunk()
         }
     }
 
@@ -165,9 +165,9 @@ where
     }
 
     #[cfg(feature = "std")]
-    fn bytes_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
-        let mut n = self.a.bytes_vectored(dst);
-        n += self.b.bytes_vectored(&mut dst[n..]);
+    fn chunks_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
+        let mut n = self.a.chunks_vectored(dst);
+        n += self.b.chunks_vectored(&mut dst[n..]);
         n
     }
 }
@@ -181,11 +181,11 @@ where
         self.a.remaining_mut() + self.b.remaining_mut()
     }
 
-    fn bytes_mut(&mut self) -> &mut UninitSlice {
+    fn chunk_mut(&mut self) -> &mut UninitSlice {
         if self.a.has_remaining_mut() {
-            self.a.bytes_mut()
+            self.a.chunk_mut()
         } else {
-            self.b.bytes_mut()
+            self.b.chunk_mut()
         }
     }
 

src/buf/iter.rs

@@ -117,7 +117,7 @@ impl<T: Buf> Iterator for IntoIter<T> {
             return None;
         }
 
-        let b = self.inner.bytes()[0];
+        let b = self.inner.chunk()[0];
         self.inner.advance(1);
 
         Some(b)