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actix-website/static/api/actix-web/stable/src/actix_web/ws/mask.rs.html
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</pre><pre class="rust ">
<span class="doccomment">//! This is code from [Tungstenite project](https://github.com/snapview/tungstenite-rs)</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">cast_ptr_alignment</span>))]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;
<span class="comment">// Holds a slice guaranteed to be shorter than 8 bytes</span>
<span class="kw">struct</span> <span class="ident">ShortSlice</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]);
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">ShortSlice</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">slice</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="self">Self</span> {
<span class="comment">// Sanity check for debug builds</span>
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">slice</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="number">8</span>);
<span class="ident">ShortSlice</span>(<span class="ident">slice</span>)
}
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">len</span>()
}
}
<span class="doccomment">/// Faster version of `apply_mask()` which operates on 8-byte blocks.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">cast_lossless</span>))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">apply_mask</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">mask_u32</span>: <span class="ident">u32</span>) {
<span class="comment">// Extend the mask to 64 bits</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">mask_u64</span> <span class="op">=</span> ((<span class="ident">mask_u32</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op">&lt;&lt;</span> <span class="number">32</span>) <span class="op">|</span> (<span class="ident">mask_u32</span> <span class="kw">as</span> <span class="ident">u64</span>);
<span class="comment">// Split the buffer into three segments</span>
<span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">mid</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">align_buf</span>(<span class="ident">buf</span>);
<span class="comment">// Initial unaligned segment</span>
<span class="kw">let</span> <span class="ident">head_len</span> <span class="op">=</span> <span class="ident">head</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">head_len</span> <span class="op">&gt;</span> <span class="number">0</span> {
<span class="ident">xor_short</span>(<span class="ident">head</span>, <span class="ident">mask_u64</span>);
<span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_endian</span> <span class="op">=</span> <span class="string">&quot;big&quot;</span>) {
<span class="ident">mask_u64</span> <span class="op">=</span> <span class="ident">mask_u64</span>.<span class="ident">rotate_left</span>(<span class="number">8</span> <span class="op">*</span> <span class="ident">head_len</span> <span class="kw">as</span> <span class="ident">u32</span>);
} <span class="kw">else</span> {
<span class="ident">mask_u64</span> <span class="op">=</span> <span class="ident">mask_u64</span>.<span class="ident">rotate_right</span>(<span class="number">8</span> <span class="op">*</span> <span class="ident">head_len</span> <span class="kw">as</span> <span class="ident">u32</span>);
}
}
<span class="comment">// Aligned segment</span>
<span class="kw">for</span> <span class="ident">v</span> <span class="kw">in</span> <span class="ident">mid</span> {
<span class="kw-2">*</span><span class="ident">v</span> <span class="op">^=</span> <span class="ident">mask_u64</span>;
}
<span class="comment">// Final unaligned segment</span>
<span class="kw">if</span> <span class="ident">tail</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="number">0</span> {
<span class="ident">xor_short</span>(<span class="ident">tail</span>, <span class="ident">mask_u64</span>);
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="comment">// TODO: copy_nonoverlapping here compiles to call memcpy. While it is not so</span>
<span class="comment">// inefficient, it could be done better. The compiler does not understand that</span>
<span class="comment">// a `ShortSlice` must be smaller than a u64.</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(
<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>,
<span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">needless_pass_by_value</span>)
)]</span>
<span class="kw">fn</span> <span class="ident">xor_short</span>(<span class="ident">buf</span>: <span class="ident">ShortSlice</span>, <span class="ident">mask</span>: <span class="ident">u64</span>) {
<span class="comment">// Unsafe: we know that a `ShortSlice` fits in a u64</span>
<span class="kw">unsafe</span> {
<span class="kw">let</span> (<span class="ident">ptr</span>, <span class="ident">len</span>) <span class="op">=</span> (<span class="ident">buf</span>.<span class="number">0</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">buf</span>.<span class="number">0</span>.<span class="ident">len</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">trivial_casts</span>)]</span>
<span class="ident">copy_nonoverlapping</span>(<span class="ident">ptr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">b</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">len</span>);
<span class="ident">b</span> <span class="op">^=</span> <span class="ident">mask</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">trivial_casts</span>)]</span>
<span class="ident">copy_nonoverlapping</span>(<span class="kw-2">&amp;</span><span class="ident">b</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">ptr</span>, <span class="ident">len</span>);
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="comment">// Unsafe: caller must ensure the buffer has the correct size and alignment</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">cast_slice</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u64</span>] {
<span class="comment">// Assert correct size and alignment in debug builds</span>
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">len</span>().<span class="ident">trailing_zeros</span>() <span class="op">&gt;=</span> <span class="number">3</span>);
<span class="macro">debug_assert</span><span class="macro">!</span>((<span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">trailing_zeros</span>() <span class="op">&gt;=</span> <span class="number">3</span>);
<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u64</span>, <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">&gt;&gt;</span> <span class="number">3</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="comment">// Splits a slice into three parts: an unaligned short head and tail, plus an aligned</span>
<span class="comment">// u64 mid section.</span>
<span class="kw">fn</span> <span class="ident">align_buf</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> (<span class="ident">ShortSlice</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u64</span>], <span class="ident">ShortSlice</span>) {
<span class="kw">let</span> <span class="ident">start_ptr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">end_ptr</span> <span class="op">=</span> <span class="ident">start_ptr</span> <span class="op">+</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="comment">// Round *up* to next aligned boundary for start</span>
<span class="kw">let</span> <span class="ident">start_aligned</span> <span class="op">=</span> (<span class="ident">start_ptr</span> <span class="op">+</span> <span class="number">7</span>) <span class="op">&amp;</span> <span class="op">!</span><span class="number">0x7</span>;
<span class="comment">// Round *down* to last aligned boundary for end</span>
<span class="kw">let</span> <span class="ident">end_aligned</span> <span class="op">=</span> <span class="ident">end_ptr</span> <span class="op">&amp;</span> <span class="op">!</span><span class="number">0x7</span>;
<span class="kw">if</span> <span class="ident">end_aligned</span> <span class="op">&gt;=</span> <span class="ident">start_aligned</span> {
<span class="comment">// We have our three segments (head, mid, tail)</span>
<span class="kw">let</span> (<span class="ident">tmp</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">split_at_mut</span>(<span class="ident">end_aligned</span> <span class="op">-</span> <span class="ident">start_ptr</span>);
<span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">mid</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">start_aligned</span> <span class="op">-</span> <span class="ident">start_ptr</span>);
<span class="comment">// Unsafe: we know the middle section is correctly aligned, and the outer</span>
<span class="comment">// sections are smaller than 8 bytes</span>
<span class="kw">unsafe</span> { (<span class="ident">ShortSlice</span>::<span class="ident">new</span>(<span class="ident">head</span>), <span class="ident">cast_slice</span>(<span class="ident">mid</span>), <span class="ident">ShortSlice</span>(<span class="ident">tail</span>)) }
} <span class="kw">else</span> {
<span class="comment">// We didn&#39;t cross even one aligned boundary!</span>
<span class="comment">// Unsafe: The outer sections are smaller than 8 bytes</span>
<span class="kw">unsafe</span> { (<span class="ident">ShortSlice</span>::<span class="ident">new</span>(<span class="ident">buf</span>), <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [], <span class="ident">ShortSlice</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> [])) }
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">apply_mask</span>;
<span class="kw">use</span> <span class="ident">byteorder</span>::{<span class="ident">ByteOrder</span>, <span class="ident">LittleEndian</span>};
<span class="doccomment">/// A safe unoptimized mask application.</span>
<span class="kw">fn</span> <span class="ident">apply_mask_fallback</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">mask</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>; <span class="number">4</span>]) {
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">byte</span>) <span class="kw">in</span> <span class="ident">buf</span>.<span class="ident">iter_mut</span>().<span class="ident">enumerate</span>() {
<span class="kw-2">*</span><span class="ident">byte</span> <span class="op">^=</span> <span class="ident">mask</span>[<span class="ident">i</span> <span class="op">&amp;</span> <span class="number">3</span>];
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_apply_mask</span>() {
<span class="kw">let</span> <span class="ident">mask</span> <span class="op">=</span> [<span class="number">0x6d</span>, <span class="number">0xb6</span>, <span class="number">0xb2</span>, <span class="number">0x80</span>];
<span class="kw">let</span> <span class="ident">mask_u32</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="ident">LittleEndian</span>::<span class="ident">read_u32</span>(<span class="kw-2">&amp;</span><span class="ident">mask</span>);
<span class="kw">let</span> <span class="ident">unmasked</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[
<span class="number">0xf3</span>, <span class="number">0x00</span>, <span class="number">0x01</span>, <span class="number">0x02</span>, <span class="number">0x03</span>, <span class="number">0x80</span>, <span class="number">0x81</span>, <span class="number">0x82</span>, <span class="number">0xff</span>, <span class="number">0xfe</span>, <span class="number">0x00</span>, <span class="number">0x17</span>,
<span class="number">0x74</span>, <span class="number">0xf9</span>, <span class="number">0x12</span>, <span class="number">0x03</span>,
];
<span class="comment">// Check masking with proper alignment.</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">masked</span> <span class="op">=</span> <span class="ident">unmasked</span>.<span class="ident">clone</span>();
<span class="ident">apply_mask_fallback</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">masked</span>, <span class="kw-2">&amp;</span><span class="ident">mask</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">masked_fast</span> <span class="op">=</span> <span class="ident">unmasked</span>.<span class="ident">clone</span>();
<span class="ident">apply_mask</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">masked_fast</span>, <span class="ident">mask_u32</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">masked</span>, <span class="ident">masked_fast</span>);
}
<span class="comment">// Check masking without alignment.</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">masked</span> <span class="op">=</span> <span class="ident">unmasked</span>.<span class="ident">clone</span>();
<span class="ident">apply_mask_fallback</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">masked</span>[<span class="number">1</span>..], <span class="kw-2">&amp;</span><span class="ident">mask</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">masked_fast</span> <span class="op">=</span> <span class="ident">unmasked</span>.<span class="ident">clone</span>();
<span class="ident">apply_mask</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">masked_fast</span>[<span class="number">1</span>..], <span class="ident">mask_u32</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">masked</span>, <span class="ident">masked_fast</span>);
}
}
}
</pre>
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