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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1512#note_851506961">lib/ext/compress_certificate.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
127
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC127" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_INVALID_REQUEST</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
128
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC128" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
129
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC129" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">methods_len</span><span class="p">;</span> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">i</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
130
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC130" class="line" lang="c"> <span class="n" style="color: #333;">tmp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_compress_certificate_method2num</span><span class="p">(</span><span class="n" style="color: #333;">methods</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
131
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC131" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">tmp</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</span> <span class="o" style="font-weight: 600;">||</span></span>
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<td class="new_line diff-line-num new" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
132
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC132" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_compression_get_name</span><span class="p">(</span><span class="n" style="color: #333;">tmp</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
133
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC133" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_INVALID_REQUEST</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
134
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC134" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_write_uint16</span><span class="p">(</span><span class="n" style="color: #333;">tmp</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)(</span><span class="n" style="color: #333;">algs</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">i</span><span class="p">));</span></span>
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135
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC135" class="line" lang="c"> <span class="p">}</span></span>
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136
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<td class="new_line diff-line-num new" data-linenumber="137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
137
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC137" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_hello_ext_unset_priv</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">GNUTLS_EXTENSION_COMPRESS_CERTIFICATE</span><span class="p">);</span></span>
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138
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<td class="new_line diff-line-num new" data-linenumber="139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
139
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC139" class="line" lang="c"> <span class="n" style="color: #333;">priv</span><span class="p">.</span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">algs</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
140
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC140" class="line" lang="c"> <span class="n" style="color: #333;">priv</span><span class="p">.</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">methods_len</span> <span class="o" style="font-weight: 600;">*</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint16_t</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
141
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC141" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
142
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0"><pre style="margin: 0;">+<span id="LC142" 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_hello_ext_set_datum</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">GNUTLS_EXTENSION_COMPRESS_CERTIFICATE</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">priv</span><span class="p">);</span></span>
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<div style="">
<p dir="auto">For sending that would be ok, but for receiving you still have deserialization logic for the data we set by ourselves (to figure out the overlapped algorithms sent by the peer and ours).</p>
<p dir="auto">I'd say it is a good practice to avoid (de)serialization as possible, and one way to do that is to do (de)serialization at the very point it is needed. So I suggest:</p>
<ul dir="auto">
<li>in <code>_set_methods</code>, store <code>gnutls_compression_method_t</code> as is in priv, no serialization</li>
<li>in <code>_send</code>, serialize the <code>gnutls_compression_method_t</code> array to bytes</li>
<li>in <code>_recv</code>, deserialize the <code>gnutls_compression_method_t</code> array from bytes</li>
</ul>
<p dir="auto">Currently, it's mixed like:</p>
<ul dir="auto">
<li>in <code>_set_methods</code>, serialize the <code>gnutls_compression_method_t</code> to bytes and store it in priv</li>
<li>in <code>_send</code>, send it as is</li>
<li>in <code>_recv</code>, deserialize the <code>gnutls_compression_method_t</code> array from bytes sent by the peer, as well as ours</li>
</ul>
<p dir="auto">which is a bit hard to follow...</p>
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