<p>I have taken some time to investigate this issue and the problem is that you use the "isalpha" function in the is_mime_char routine:</p>

<div class="highlight highlight-source-c"><pre>#<span class="pl-k">define</span> <span class="pl-en">is_mime_char</span>(<span class="pl-v">_c_</span>) \
        (isalpha((<span class="pl-k">int</span>)_c_) || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>-<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>+<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>.<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>_<span class="pl-pds">'</span></span>)</pre></div>

<p>But a MIME type can have digits in it (as you can see in some MIME types registered with IANA: <a href="http://www.iana.org/assignments/media-types/media-types.xhtml">http://www.iana.org/assignments/media-types/media-types.xhtml</a>)</p>

<p>So a more convenient validation function would be "isalnum":</p>

<div class="highlight highlight-source-c"><pre>#<span class="pl-k">define</span> <span class="pl-en">is_mime_char</span>(<span class="pl-v">_c_</span>) \
        (isalnum((<span class="pl-k">int</span>)_c_) || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>-<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>+<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>.<span class="pl-pds">'</span></span> || (_c_)==<span class="pl-s"><span class="pl-pds">'</span>_<span class="pl-pds">'</span></span>)</pre></div>

<p>After changing this, there is no more parsing errors.</p>

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