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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_229671343">lib/str.c</a>:
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">dest</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">length</span><span class="p">)</span> <span class="p">{</span></span>
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401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">dest</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;">pos</span><span class="p">]</span> <span class="o" style="font-weight: 600;">==</span> <span class="sc" style="color: #d14;">'%'</span><span class="p">)</span> <span class="p">{</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="n" style="color: #333;">b</span><span class="p">[</span><span class="mi" style="color: #099;">3</span><span class="p">];</span></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">u</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="n" style="color: #333;">x</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="c"> <span class="n" style="color: #333;">b</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</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;">pos</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">];</span></span>
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407
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="c"> <span class="n" style="color: #333;">b</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</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;">pos</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">2</span><span class="p">];</span></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="c"> <span class="n" style="color: #333;">b</span><span class="p">[</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="c"> <span class="n" style="color: #333;">sscanf</span><span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="s" style="color: #d14;">"%02x"</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">u</span><span class="p">);</span></span>
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411
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="c"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="c"> <span class="n" style="color: #333;">hex_decode</span><span class="p">((</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;">dest</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<p dir="auto">I would not spend much time on improving <code>_gnutls_buffer_unescape</code>. It is used on very corner case and improving it will not really improve performance in any noticeable way. I also see limitations of an <code>append_unescape()</code> function (e.g., would it work when you append byte by byte?, and other corner cases).</p>
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