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</pre><pre class='rust '>
<span class='kw'>use</span> <span class='ident'>libc</span>::{<span class='ident'>c_void</span>, <span class='ident'>c_int</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ptr</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>;

<span class='kw'>use</span> <span class='ident'>ffi</span>;
<span class='kw'>use</span> <span class='ident'>ffi_extras</span>;
<span class='kw'>use</span> <span class='ident'>ssl</span>::<span class='ident'>error</span>::<span class='ident'>SslError</span>;

<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>MemBio</span> {
    <span class='ident'>bio</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIO</span>,
    <span class='ident'>owned</span>: <span class='ident'>bool</span>,
}

<span class='kw'>impl</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>MemBio</span> {
    <span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>owned</span> {
            <span class='kw'>unsafe</span> {
                <span class='ident'>ffi</span>::<span class='ident'>BIO_free_all</span>(<span class='self'>self</span>.<span class='ident'>bio</span>);
            }
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>MemBio</span> {
    <span class='doccomment'>/// Creates a new owned memory based BIO</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>MemBio</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='ident'>ffi</span>::<span class='ident'>init</span>();

        <span class='kw'>let</span> <span class='ident'>bio</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BIO_new</span>(<span class='ident'>ffi</span>::<span class='ident'>BIO_s_mem</span>()) };
        <span class='macro'>try_ssl_null</span><span class='macro'>!</span>(<span class='ident'>bio</span>);

        <span class='prelude-val'>Ok</span>(<span class='ident'>MemBio</span> {
            <span class='ident'>bio</span>: <span class='ident'>bio</span>,
            <span class='ident'>owned</span>: <span class='bool-val'>true</span>,
        })
    }

    <span class='doccomment'>/// Returns a &quot;borrow&quot;, i.e. it has no ownership</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>borrowed</span>(<span class='ident'>bio</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIO</span>) <span class='op'>-&gt;</span> <span class='ident'>MemBio</span> {
        <span class='ident'>MemBio</span> {
            <span class='ident'>bio</span>: <span class='ident'>bio</span>,
            <span class='ident'>owned</span>: <span class='bool-val'>false</span>,
        }
    }

    <span class='doccomment'>/// Consumes current bio and returns wrapped value</span>
    <span class='doccomment'>/// Note that data ownership is lost and</span>
    <span class='doccomment'>/// should be managed manually</span>
    <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>fn</span> <span class='ident'>unwrap</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIO</span> {
        <span class='self'>self</span>.<span class='ident'>owned</span> <span class='op'>=</span> <span class='bool-val'>false</span>;
        <span class='self'>self</span>.<span class='ident'>bio</span>
    }

    <span class='doccomment'>/// Temporarily gets wrapped value</span>
    <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>fn</span> <span class='ident'>get_handle</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIO</span> {
        <span class='self'>self</span>.<span class='ident'>bio</span>
    }

    <span class='doccomment'>/// Sets the BIO&#39;s EOF state.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_eof</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>eof</span>: <span class='ident'>bool</span>) {
        <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>eof</span> {
            <span class='number'>0</span>
        } <span class='kw'>else</span> {
            <span class='op'>-</span><span class='number'>1</span>
        };
        <span class='kw'>unsafe</span> {
            <span class='ident'>ffi_extras</span>::<span class='ident'>BIO_set_mem_eof_return</span>(<span class='self'>self</span>.<span class='ident'>bio</span>, <span class='ident'>v</span>);
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>Read</span> <span class='kw'>for</span> <span class='ident'>MemBio</span> {
    <span class='kw'>fn</span> <span class='ident'>read</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</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'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>cmp</span>::<span class='ident'>min</span>(<span class='ident'>c_int</span>::<span class='ident'>max_value</span>() <span class='kw'>as</span> <span class='ident'>usize</span>, <span class='ident'>buf</span>.<span class='ident'>len</span>()) <span class='kw'>as</span> <span class='ident'>c_int</span>;
        <span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BIO_read</span>(<span class='self'>self</span>.<span class='ident'>bio</span>, <span class='ident'>buf</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>c_void</span>, <span class='ident'>len</span>) };

        <span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>&lt;=</span> <span class='number'>0</span> {
            <span class='kw'>let</span> <span class='ident'>is_eof</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>ffi_extras</span>::<span class='ident'>BIO_eof</span>(<span class='self'>self</span>.<span class='ident'>bio</span>) };
            <span class='kw'>if</span> <span class='ident'>is_eof</span> <span class='op'>!=</span> <span class='number'>0</span> {
                <span class='prelude-val'>Ok</span>(<span class='number'>0</span>)
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Other</span>, <span class='ident'>SslError</span>::<span class='ident'>get</span>()))
            }
        } <span class='kw'>else</span> {
            <span class='prelude-val'>Ok</span>(<span class='ident'>ret</span> <span class='kw'>as</span> <span class='ident'>usize</span>)
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>Write</span> <span class='kw'>for</span> <span class='ident'>MemBio</span> {
    <span class='kw'>fn</span> <span class='ident'>write</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>cmp</span>::<span class='ident'>min</span>(<span class='ident'>c_int</span>::<span class='ident'>max_value</span>() <span class='kw'>as</span> <span class='ident'>usize</span>, <span class='ident'>buf</span>.<span class='ident'>len</span>()) <span class='kw'>as</span> <span class='ident'>c_int</span>;
        <span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BIO_write</span>(<span class='self'>self</span>.<span class='ident'>bio</span>, <span class='ident'>buf</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> <span class='ident'>c_void</span>, <span class='ident'>len</span>) };

        <span class='kw'>if</span> <span class='ident'>ret</span> <span class='op'>&lt;</span> <span class='number'>0</span> {
            <span class='prelude-val'>Err</span>(<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Other</span>, <span class='ident'>SslError</span>::<span class='ident'>get</span>()))
        } <span class='kw'>else</span> {
            <span class='prelude-val'>Ok</span>(<span class='ident'>ret</span> <span class='kw'>as</span> <span class='ident'>usize</span>)
        }
    }

    <span class='kw'>fn</span> <span class='ident'>flush</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> {
        <span class='prelude-val'>Ok</span>(())
    }
}
</pre>
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