Deprecate fns fill_via_u{32|64}_chunks

rand_core/src/block.rs

@@ -53,7 +53,7 @@
 //! [`BlockRngCore`]: crate::block::BlockRngCore
 //! [`fill_bytes`]: RngCore::fill_bytes
 
-use crate::impls::{fill_via_u32_chunks, fill_via_u64_chunks};
+use crate::impls::fill_via_chunks;
 use crate::{CryptoRng, RngCore, SeedableRng, TryRngCore};
 use core::fmt;
 #[cfg(feature = "serde")]
@@ -225,10 +225,8 @@ impl<R: BlockRngCore<Item = u32>> RngCore for BlockRng<R> {
             if self.index >= self.results.as_ref().len() {
                 self.generate_and_set(0);
             }
-            let (consumed_u32, filled_u8) = fill_via_u32_chunks(
-                &mut self.results.as_mut()[self.index..],
-                &mut dest[read_len..],
-            );
+            let (consumed_u32, filled_u8) =
+                fill_via_chunks(&self.results.as_mut()[self.index..], &mut dest[read_len..]);
 
             self.index += consumed_u32;
             read_len += filled_u8;
@@ -390,10 +388,8 @@ impl<R: BlockRngCore<Item = u64>> RngCore for BlockRng64<R> {
                 self.index = 0;
             }
 
-            let (consumed_u64, filled_u8) = fill_via_u64_chunks(
-                &mut self.results.as_mut()[self.index..],
-                &mut dest[read_len..],
-            );
+            let (consumed_u64, filled_u8) =
+                fill_via_chunks(&self.results.as_mut()[self.index..], &mut dest[read_len..]);
 
             self.index += consumed_u64;
             read_len += filled_u8;

rand_core/src/impls.rs

@@ -51,7 +51,7 @@ pub fn fill_bytes_via_next<R: RngCore + ?Sized>(rng: &mut R, dest: &mut [u8]) {
     }
 }
 
-trait Observable: Copy {
+pub(crate) trait Observable: Copy {
     type Bytes: Sized + AsRef<[u8]>;
     fn to_le_bytes(self) -> Self::Bytes;
 }
@@ -72,10 +72,10 @@ impl Observable for u64 {
 
 /// Fill dest from src
 ///
-/// Returns `(n, byte_len)`. `src[..n]` is consumed (and possibly mutated),
+/// Returns `(n, byte_len)`. `src[..n]` is consumed,
 /// `dest[..byte_len]` is filled. `src[n..]` and `dest[byte_len..]` are left
 /// unaltered.
-fn fill_via_chunks<T: Observable>(src: &[T], dest: &mut [u8]) -> (usize, usize) {
+pub(crate) fn fill_via_chunks<T: Observable>(src: &[T], dest: &mut [u8]) -> (usize, usize) {
     let size = core::mem::size_of::<T>();
 
     // Always use little endian for portability of results.
@@ -133,8 +133,8 @@ fn fill_via_chunks<T: Observable>(src: &[T], dest: &mut [u8]) -> (usize, usize)
 ///     }
 /// }
 /// ```
+#[deprecated(since = "0.9.3", note = "use BlockRng instead")]
 pub fn fill_via_u32_chunks(src: &mut [u32], dest: &mut [u8]) -> (usize, usize) {
-    // TODO(SemVer): src: `&[u32]` as we don't mutate it.
     fill_via_chunks(src, dest)
 }
 
@@ -152,8 +152,8 @@ pub fn fill_via_u32_chunks(src: &mut [u32], dest: &mut [u8]) -> (usize, usize) {
 /// as `filled_u8 / 8` rounded up.
 ///
 /// See `fill_via_u32_chunks` for an example.
+#[deprecated(since = "0.9.3", note = "use BlockRng64 instead")]
 pub fn fill_via_u64_chunks(src: &mut [u64], dest: &mut [u8]) -> (usize, usize) {
-    // TODO(SemVer): src: `&[u64]` as we don't mutate it.
     fill_via_chunks(src, dest)
 }
 
@@ -177,41 +177,41 @@ mod test {
 
     #[test]
     fn test_fill_via_u32_chunks() {
-        let src_orig = [1, 2, 3];
+        let src_orig = [1u32, 2, 3];
 
         let mut src = src_orig;
         let mut dst = [0u8; 11];
-        assert_eq!(fill_via_u32_chunks(&mut src, &mut dst), (3, 11));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (3, 11));
         assert_eq!(dst, [1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0]);
 
         let mut src = src_orig;
         let mut dst = [0u8; 13];
-        assert_eq!(fill_via_u32_chunks(&mut src, &mut dst), (3, 12));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (3, 12));
         assert_eq!(dst, [1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0]);
 
         let mut src = src_orig;
         let mut dst = [0u8; 5];
-        assert_eq!(fill_via_u32_chunks(&mut src, &mut dst), (2, 5));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (2, 5));
         assert_eq!(dst, [1, 0, 0, 0, 2]);
     }
 
     #[test]
     fn test_fill_via_u64_chunks() {
-        let src_orig = [1, 2];
+        let src_orig = [1u64, 2];
 
         let mut src = src_orig;
         let mut dst = [0u8; 11];
-        assert_eq!(fill_via_u64_chunks(&mut src, &mut dst), (2, 11));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (2, 11));
         assert_eq!(dst, [1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0]);
 
         let mut src = src_orig;
         let mut dst = [0u8; 17];
-        assert_eq!(fill_via_u64_chunks(&mut src, &mut dst), (2, 16));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (2, 16));
         assert_eq!(dst, [1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0]);
 
         let mut src = src_orig;
         let mut dst = [0u8; 5];
-        assert_eq!(fill_via_u64_chunks(&mut src, &mut dst), (1, 5));
+        assert_eq!(fill_via_chunks(&mut src, &mut dst), (1, 5));
         assert_eq!(dst, [1, 0, 0, 0, 0]);
     }
 }