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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/902#note_138658627">lib/auth/cert.c</a>:
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         * length = 3 bytes and</span></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         * certificate = length bytes.</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         */</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="c">    <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_buffer_append_data_prefix</span><span class="p">(</span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="mi" style="color: #099;">24</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="c">                                    <span class="n" style="color: #333;">apr_cert_list</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">cert</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="c">                                    <span class="n" style="color: #333;">apr_cert_list</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">cert</span><span class="p">.</span><span class="n" style="color: #333;">size</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">apr_cert_list_length</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="c">            <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_buffer_append_prefix</span><span class="p">(</span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="mi" style="color: #099;">24</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<p dir="auto">Scanned the source... 24 is the number of bits taken from argument 4 (size) to be put into 'data' using the correct byte-order (endianess). We possible could split <code>_gnutls_buffer_append_prefix</code> into <code>_gnutls_buffer_append_prefix8, _gnutls_buffer_append_prefix16, _gnutls_buffer_append_prefix24, _gnutls_buffer_append_prefix32</code> to have static inline functions without error checking.</p>
<p dir="auto">That way the code would also be much more readable, IMO. But this is not part of this issue ;-)</p>
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