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<p style="color: #777777;">
<a href="https://gitlab.com/ZoltanFridrich">Zoltán Fridrich</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1512#note_849563413">lib/ext/compress_certificate.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="107" 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">
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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="LC107" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int</span></span>
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<td class="new_line diff-line-num new" data-linenumber="108" 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">
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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="LC108" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">gnutls_compress_certificate_set_methods</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_session_t</span> <span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">methods</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="109" 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">
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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="LC109" class="line" lang="c"><span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="110" 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">
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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="LC110" class="line" lang="c">    <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ret</span><span class="p">,</span> <span class="n" style="color: #333;">tmp</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="111" 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">
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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="LC111" class="line" lang="c">    <span class="kt" style="color: #458; font-weight: 600;">uint16_t</span> <span class="n" style="color: #333;">priv_algs</span><span class="p">[</span><span class="n" style="color: #333;">MAX_COMPRESS_CERTIFICATE_METHODS</span><span class="p">];</span></span>
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<td class="new_line diff-line-num new" data-linenumber="112" 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">
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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="LC112" class="line" lang="c">    <span class="n" style="color: #333;">gnutls_compression_method_t</span> <span class="n" style="color: #333;">algs</span><span class="p">[</span><span class="n" style="color: #333;">MAX_COMPRESS_CERTIFICATE_METHODS</span><span class="p">];</span></span>
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<td class="new_line diff-line-num new" data-linenumber="113" 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">
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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="LC113" class="line" lang="c">    <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="n" style="color: #333;">priv</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="114" 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">
114
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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="LC114" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="115" 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">
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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="LC115" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">methods</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">MIN_COMPRESS_CERTIFICATE_METHODS</span> <span class="o" style="font-weight: 600;">||</span></span>
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<td class="new_line diff-line-num new" data-linenumber="116" 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">
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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="LC116" class="line" lang="c">        <span class="n" style="color: #333;">methods</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">MAX_COMPRESS_CERTIFICATE_METHODS</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="117" 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">
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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="LC117" 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="118" 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">
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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="LC118" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="119" 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">
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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="LC119" class="line" lang="c">    <span class="n" style="color: #333;">memcpy</span><span class="p">(</span><span class="n" style="color: #333;">algs</span><span class="p">,</span> <span class="n" style="color: #333;">methods</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="n" style="color: #333;">methods</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">*</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_compression_method_t</span><span class="p">));</span></span>
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<td class="new_line diff-line-num new" data-linenumber="120" 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">
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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="LC120" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="121" 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">
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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="LC121" 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</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</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="122" 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">
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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="LC122" 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;">algs</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">]);</span></span>
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<div style="">
<p dir="auto"><code>GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</code> seem more appropriate, both when methods->size check fails and when unimplemented alg is provided.</p>
<p dir="auto">I will also add an option to unset compression methods. When methods == NULL OR methods_len == 0, then unset compression methods. Because currently if you would set them, you wouldnt be able to unset them as methods_len 0 would be an invalid param error.</p>
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