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| <h1 class="fqn"><span class="in-band">Function <a href="../index.html">rand_core</a>::<wbr><a href="index.html">impls</a>::<wbr><a class="fn" href="#">fill_via_u32_chunks</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"> |
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| <div class="docblock item-decl"><pre class="rust fn"><code>pub fn fill_via_u32_chunks(src: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Implement <code>fill_bytes</code> by reading chunks from the output buffer of a block |
| based RNG.</p> |
| <p>The return values are <code>(consumed_u32, filled_u8)</code>.</p> |
| <p><code>filled_u8</code> is the number of filled bytes in <code>dest</code>, which may be less than |
| the length of <code>dest</code>. |
| <code>consumed_u32</code> is the number of words consumed from <code>src</code>, which is the same |
| as <code>filled_u8 / 4</code> rounded up.</p> |
| <h2 id="example" class="section-header"><a href="#example">Example</a></h2> |
| <p>(from <code>IsaacRng</code>)</p> |
| |
| <div class='information'><div class='tooltip ignore'>ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered ignore"><code><span class="kw">fn</span> <span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">dest</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">read_len</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">while</span> <span class="ident">read_len</span> <span class="op"><</span> <span class="ident">dest</span>.<span class="ident">len</span>() { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span> <span class="op">></span><span class="op">=</span> <span class="self">self</span>.<span class="ident">rsl</span>.<span class="ident">len</span>() { |
| <span class="self">self</span>.<span class="ident">isaac</span>(); |
| } |
| |
| <span class="kw">let</span> (<span class="ident">consumed_u32</span>, <span class="ident">filled_u8</span>) <span class="op">=</span> |
| <span class="ident">impls::fill_via_u32_chunks</span>(<span class="kw-2">&mut</span> <span class="self">self</span>.<span class="ident">rsl</span>[<span class="self">self</span>.<span class="ident">index</span>..], |
| <span class="kw-2">&mut</span> <span class="ident">dest</span>[<span class="ident">read_len</span>..]); |
| |
| <span class="self">self</span>.<span class="ident">index</span> <span class="op">+</span><span class="op">=</span> <span class="ident">consumed_u32</span>; |
| <span class="ident">read_len</span> <span class="op">+</span><span class="op">=</span> <span class="ident">filled_u8</span>; |
| } |
| }</code></pre></div> |
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