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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! Helper functions for implementing `RngCore` functions. |
| //! |
| //! For cross-platform reproducibility, these functions all use Little Endian: |
| //! least-significant part first. For example, `next_u64_via_u32` takes `u32` |
| //! values `x, y`, then outputs `(y << 32) | x`. To implement `next_u32` |
| //! from `next_u64` in little-endian order, one should use `next_u64() as u32`. |
| //! |
| //! Byte-swapping (like the std `to_le` functions) is only needed to convert |
| //! to/from byte sequences, and since its purpose is reproducibility, |
| //! non-reproducible sources (e.g. `OsRng`) need not bother with it. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::RngCore; |
| <span class="kw">use </span>core::cmp::min; |
| |
| <span class="doccomment">/// Implement `next_u64` via `next_u32`, little-endian order. |
| </span><span class="kw">pub fn </span>next_u64_via_u32<R: RngCore + <span class="question-mark">?</span>Sized>(rng: <span class="kw-2">&mut </span>R) -> u64 { |
| <span class="comment">// Use LE; we explicitly generate one value before the next. |
| </span><span class="kw">let </span>x = u64::from(rng.next_u32()); |
| <span class="kw">let </span>y = u64::from(rng.next_u32()); |
| (y << <span class="number">32</span>) | x |
| } |
| |
| <span class="doccomment">/// Implement `fill_bytes` via `next_u64` and `next_u32`, little-endian order. |
| /// |
| /// The fastest way to fill a slice is usually to work as long as possible with |
| /// integers. That is why this method mostly uses `next_u64`, and only when |
| /// there are 4 or less bytes remaining at the end of the slice it uses |
| /// `next_u32` once. |
| </span><span class="kw">pub fn </span>fill_bytes_via_next<R: RngCore + <span class="question-mark">?</span>Sized>(rng: <span class="kw-2">&mut </span>R, dest: <span class="kw-2">&mut </span>[u8]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>left = dest; |
| <span class="kw">while </span>left.len() >= <span class="number">8 </span>{ |
| <span class="kw">let </span>(l, r) = { left }.split_at_mut(<span class="number">8</span>); |
| left = r; |
| <span class="kw">let </span>chunk: [u8; <span class="number">8</span>] = rng.next_u64().to_le_bytes(); |
| l.copy_from_slice(<span class="kw-2">&</span>chunk); |
| } |
| <span class="kw">let </span>n = left.len(); |
| <span class="kw">if </span>n > <span class="number">4 </span>{ |
| <span class="kw">let </span>chunk: [u8; <span class="number">8</span>] = rng.next_u64().to_le_bytes(); |
| left.copy_from_slice(<span class="kw-2">&</span>chunk[..n]); |
| } <span class="kw">else if </span>n > <span class="number">0 </span>{ |
| <span class="kw">let </span>chunk: [u8; <span class="number">4</span>] = rng.next_u32().to_le_bytes(); |
| left.copy_from_slice(<span class="kw-2">&</span>chunk[..n]); |
| } |
| } |
| |
| <span class="kw">trait </span>Observable: Copy { |
| <span class="kw">type </span>Bytes: AsRef<[u8]>; |
| <span class="kw">fn </span>to_le_bytes(<span class="self">self</span>) -> <span class="self">Self</span>::Bytes; |
| |
| <span class="comment">// Contract: observing self is memory-safe (implies no uninitialised padding) |
| </span><span class="kw">fn </span>as_byte_slice(x: <span class="kw-2">&</span>[<span class="self">Self</span>]) -> <span class="kw-2">&</span>[u8]; |
| } |
| <span class="kw">impl </span>Observable <span class="kw">for </span>u32 { |
| <span class="kw">type </span>Bytes = [u8; <span class="number">4</span>]; |
| <span class="kw">fn </span>to_le_bytes(<span class="self">self</span>) -> <span class="self">Self</span>::Bytes { |
| <span class="self">self</span>.to_le_bytes() |
| } |
| <span class="kw">fn </span>as_byte_slice(x: <span class="kw-2">&</span>[<span class="self">Self</span>]) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw">let </span>ptr = x.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>u8; |
| <span class="kw">let </span>len = x.len() * core::mem::size_of::<<span class="self">Self</span>>(); |
| <span class="kw">unsafe </span>{ core::slice::from_raw_parts(ptr, len) } |
| } |
| } |
| <span class="kw">impl </span>Observable <span class="kw">for </span>u64 { |
| <span class="kw">type </span>Bytes = [u8; <span class="number">8</span>]; |
| <span class="kw">fn </span>to_le_bytes(<span class="self">self</span>) -> <span class="self">Self</span>::Bytes { |
| <span class="self">self</span>.to_le_bytes() |
| } |
| <span class="kw">fn </span>as_byte_slice(x: <span class="kw-2">&</span>[<span class="self">Self</span>]) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw">let </span>ptr = x.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>u8; |
| <span class="kw">let </span>len = x.len() * core::mem::size_of::<<span class="self">Self</span>>(); |
| <span class="kw">unsafe </span>{ core::slice::from_raw_parts(ptr, len) } |
| } |
| } |
| |
| <span class="kw">fn </span>fill_via_chunks<T: Observable>(src: <span class="kw-2">&</span>[T], dest: <span class="kw-2">&mut </span>[u8]) -> (usize, usize) { |
| <span class="kw">let </span>size = core::mem::size_of::<T>(); |
| <span class="kw">let </span>byte_len = min(src.len() * size, dest.len()); |
| <span class="kw">let </span>num_chunks = (byte_len + size - <span class="number">1</span>) / size; |
| |
| <span class="kw">if </span><span class="macro">cfg!</span>(target_endian = <span class="string">"little"</span>) { |
| <span class="comment">// On LE we can do a simple copy, which is 25-50% faster: |
| </span>dest[..byte_len].copy_from_slice(<span class="kw-2">&</span>T::as_byte_slice(<span class="kw-2">&</span>src[..num_chunks])[..byte_len]); |
| } <span class="kw">else </span>{ |
| <span class="comment">// This code is valid on all arches, but slower than the above: |
| </span><span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = dest[..byte_len].chunks_exact_mut(size); |
| <span class="kw">for </span>chunk <span class="kw">in </span><span class="kw-2">&mut </span>iter { |
| chunk.copy_from_slice(src[i].to_le_bytes().as_ref()); |
| i += <span class="number">1</span>; |
| } |
| <span class="kw">let </span>chunk = iter.into_remainder(); |
| <span class="kw">if </span>!chunk.is_empty() { |
| chunk.copy_from_slice(<span class="kw-2">&</span>src[i].to_le_bytes().as_ref()[..chunk.len()]); |
| } |
| } |
| |
| (num_chunks, byte_len) |
| } |
| |
| <span class="doccomment">/// Implement `fill_bytes` by reading chunks from the output buffer of a block |
| /// based RNG. |
| /// |
| /// The return values are `(consumed_u32, filled_u8)`. |
| /// |
| /// `filled_u8` is the number of filled bytes in `dest`, which may be less than |
| /// the length of `dest`. |
| /// `consumed_u32` is the number of words consumed from `src`, which is the same |
| /// as `filled_u8 / 4` rounded up. |
| /// |
| /// # Example |
| /// (from `IsaacRng`) |
| /// |
| /// ```ignore |
| /// fn fill_bytes(&mut self, dest: &mut [u8]) { |
| /// let mut read_len = 0; |
| /// while read_len < dest.len() { |
| /// if self.index >= self.rsl.len() { |
| /// self.isaac(); |
| /// } |
| /// |
| /// let (consumed_u32, filled_u8) = |
| /// impls::fill_via_u32_chunks(&mut self.rsl[self.index..], |
| /// &mut dest[read_len..]); |
| /// |
| /// self.index += consumed_u32; |
| /// read_len += filled_u8; |
| /// } |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>fill_via_u32_chunks(src: <span class="kw-2">&</span>[u32], dest: <span class="kw-2">&mut </span>[u8]) -> (usize, usize) { |
| fill_via_chunks(src, dest) |
| } |
| |
| <span class="doccomment">/// Implement `fill_bytes` by reading chunks from the output buffer of a block |
| /// based RNG. |
| /// |
| /// The return values are `(consumed_u64, filled_u8)`. |
| /// `filled_u8` is the number of filled bytes in `dest`, which may be less than |
| /// the length of `dest`. |
| /// `consumed_u64` is the number of words consumed from `src`, which is the same |
| /// as `filled_u8 / 8` rounded up. |
| /// |
| /// See `fill_via_u32_chunks` for an example. |
| </span><span class="kw">pub fn </span>fill_via_u64_chunks(src: <span class="kw-2">&</span>[u64], dest: <span class="kw-2">&mut </span>[u8]) -> (usize, usize) { |
| fill_via_chunks(src, dest) |
| } |
| |
| <span class="doccomment">/// Implement `next_u32` via `fill_bytes`, little-endian order. |
| </span><span class="kw">pub fn </span>next_u32_via_fill<R: RngCore + <span class="question-mark">?</span>Sized>(rng: <span class="kw-2">&mut </span>R) -> u32 { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">4</span>]; |
| rng.fill_bytes(<span class="kw-2">&mut </span>buf); |
| u32::from_le_bytes(buf) |
| } |
| |
| <span class="doccomment">/// Implement `next_u64` via `fill_bytes`, little-endian order. |
| </span><span class="kw">pub fn </span>next_u64_via_fill<R: RngCore + <span class="question-mark">?</span>Sized>(rng: <span class="kw-2">&mut </span>R) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">8</span>]; |
| rng.fill_bytes(<span class="kw-2">&mut </span>buf); |
| u64::from_le_bytes(buf) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_fill_via_u32_chunks() { |
| <span class="kw">let </span>src = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">11</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u32_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">3</span>, <span class="number">11</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">13</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u32_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">3</span>, <span class="number">12</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">5</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u32_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">2</span>, <span class="number">5</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_fill_via_u64_chunks() { |
| <span class="kw">let </span>src = [<span class="number">1</span>, <span class="number">2</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">11</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u64_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">2</span>, <span class="number">11</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">17</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u64_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">2</span>, <span class="number">16</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0u8</span>; <span class="number">5</span>]; |
| <span class="macro">assert_eq!</span>(fill_via_u64_chunks(<span class="kw-2">&</span>src, <span class="kw-2">&mut </span>dst), (<span class="number">1</span>, <span class="number">5</span>)); |
| <span class="macro">assert_eq!</span>(dst, [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rand_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
