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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/1092#note_230554687">lib/str.c</a>:
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="n" style="color: #333;">tdata</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_buffer_pop_datum</span><span class="p">(</span><span class="n" style="color: #333;">str</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">tdata</span><span class="p">,</span> <span class="n" style="color: #333;">req_size</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">tdata</span><span class="p">.</span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">tdata</span><span class="p">.</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!=</span></span> <span class="n" style="color: #333;">req_size</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">tdata</span><span class="p">.</span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">tdata</span><span class="p">.</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">></span></span> <span class="n" style="color: #333;">req_size</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">btw. what this function does, if you ask 2 bytes, it will always give you two bytes. If the struct has 4 bytes, that's fine, it will still give you two bytes (because of the pop_datum call). It will fail when the structure did not have enough data stored (e.g., asked for 2 while it has only 1). You can see how it is used in practice in <code>hello_retry.c</code></p>
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