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</pre><pre class="rust"><code><span class="kw">use </span>core::{
convert::TryFrom,
fmt::{<span class="self">self</span>, Display, Formatter},
};
<span class="doccomment">/// Errors in this library
</span><span class="attribute">#[repr(u8)]
#[derive(Debug, Copy, Clone)]
</span><span class="kw">pub enum </span>ErrorCode {
<span class="doccomment">/// The hardware instruction is not supported
</span>UnsupportedInstruction,
<span class="doccomment">/// There was a hardware failure
</span>HardwareFailure,
}
<span class="kw">impl </span>ErrorCode {
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
</span><span class="kw">const fn </span>as_randcore_code(<span class="self">self</span>) -&gt; core::num::NonZeroU32 {
<span class="doccomment">/// Arbitrary, off top of head bitmask for error codes that come from rdrand
</span><span class="kw">const </span>RDRAND_TAG: u32 = rand_core::Error::CUSTOM_START + <span class="number">0x3D34_7D00</span>;
<span class="kw">unsafe </span>{ core::num::NonZeroU32::new_unchecked(RDRAND_TAG + <span class="self">self </span><span class="kw">as </span>u32) }
}
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
</span><span class="kw">impl </span>From&lt;ErrorCode&gt; <span class="kw">for </span>rand_core::Error {
<span class="kw">fn </span>from(code: ErrorCode) -&gt; rand_core::Error {
code.as_randcore_code().into()
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl </span>From&lt;ErrorCode&gt; <span class="kw">for </span>rand_core::Error {
<span class="kw">fn </span>from(code: ErrorCode) -&gt; rand_core::Error {
rand_core::Error::new(code)
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>ErrorCode {}
<span class="kw">impl </span>Display <span class="kw">for </span>ErrorCode {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; fmt::Result {
f.write_str(<span class="kw">match </span><span class="self">self </span>{
ErrorCode::UnsupportedInstruction =&gt; <span class="string">&quot;the hardware instruction is not supported&quot;</span>,
ErrorCode::HardwareFailure =&gt; <span class="string">&quot;hardware generator failure&quot;</span>,
})
}
}
<span class="attribute">#[derive(Copy, Clone, Debug)]
</span><span class="kw">pub struct </span>NotAnErrorCode;
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>NotAnErrorCode {}
<span class="kw">impl </span>Display <span class="kw">for </span>NotAnErrorCode {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; fmt::Result {
f.write_str(<span class="string">&quot;the error is not an rdrand error&quot;</span>)
}
}
<span class="kw">impl </span>TryFrom&lt;<span class="kw-2">&amp;</span>rand_core::Error&gt; <span class="kw">for </span>ErrorCode {
<span class="kw">type </span>Error = NotAnErrorCode;
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">fn </span>try_from(error: <span class="kw-2">&amp;</span>rand_core::Error) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
error
.inner()
.downcast_ref::&lt;ErrorCode&gt;()
.copied()
.ok_or(NotAnErrorCode)
}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
</span><span class="kw">fn </span>try_from(error: <span class="kw-2">&amp;</span>rand_core::Error) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
<span class="kw">let </span>code = error.code().ok_or(NotAnErrorCode)<span class="question-mark">?</span>;
<span class="kw">if </span>code == ErrorCode::UnsupportedInstruction.as_randcore_code() {
<span class="prelude-val">Ok</span>(ErrorCode::UnsupportedInstruction)
} <span class="kw">else if </span>code == ErrorCode::HardwareFailure.as_randcore_code() {
<span class="prelude-val">Ok</span>(ErrorCode::HardwareFailure)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(NotAnErrorCode)
}
}
}
<span class="kw">impl </span>TryFrom&lt;rand_core::Error&gt; <span class="kw">for </span>ErrorCode {
<span class="kw">type </span>Error = NotAnErrorCode;
<span class="kw">fn </span>try_from(error: rand_core::Error) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
&lt;ErrorCode <span class="kw">as </span>TryFrom&lt;<span class="kw-2">&amp;</span>rand_core::Error&gt;&gt;::try_from(<span class="kw-2">&amp;</span>error)
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>test {
<span class="kw">use </span><span class="kw">super</span>::ErrorCode;
<span class="kw">use </span>core::convert::TryInto;
<span class="kw">use </span>rand_core::Error;
<span class="attribute">#[test]
</span><span class="kw">fn </span>error_code_send() {
<span class="kw">fn </span>assert_send&lt;T: Send&gt;() {}
assert_send::&lt;ErrorCode&gt;();
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>error_code_sync() {
<span class="kw">fn </span>assert_sync&lt;T: Sync&gt;() {}
assert_sync::&lt;ErrorCode&gt;();
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>error_code_copy() {
<span class="kw">fn </span>assert_copy&lt;T: Copy&gt;() {}
assert_copy::&lt;ErrorCode&gt;();
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>error_code_clone() {
<span class="kw">fn </span>assert_clone&lt;T: Clone&gt;() {}
assert_clone::&lt;ErrorCode&gt;();
}
<span class="attribute">#[test]
#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">fn </span>error_code_error() {
<span class="kw">fn </span>assert_error&lt;T: std::error::Error&gt;() {}
assert_error::&lt;ErrorCode&gt;();
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>conversion_roundtrip_unsupported_hardware() {
<span class="kw">let </span>core_rand: Error = ErrorCode::UnsupportedInstruction.into();
<span class="kw">let </span>code: ErrorCode = core_rand.try_into().expect(<span class="string">&quot;should convert back&quot;</span>);
<span class="macro">assert!</span>(<span class="macro">matches!</span>(code, ErrorCode::UnsupportedInstruction));
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>conversion_roundtrip_hardware_failure() {
<span class="kw">let </span>core_rand: Error = ErrorCode::HardwareFailure.into();
<span class="kw">let </span>code: ErrorCode = core_rand.try_into().expect(<span class="string">&quot;should convert back&quot;</span>);
<span class="macro">assert!</span>(<span class="macro">matches!</span>(code, ErrorCode::HardwareFailure));
}
}
</code></pre></div>
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