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<a name="Common-types"></a>
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Next: <a href="Debugging-and-auditing.html#Debugging-and-auditing" accesskey="n" rel="next">Debugging and auditing</a>, Previous: <a href="Error-handling.html#Error-handling" accesskey="p" rel="prev">Error handling</a>, Up: <a href="Introduction-to-the-library.html#Introduction-to-the-library" accesskey="u" rel="up">Introduction to the library</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Common-types-1"></a>
<h4 class="subsection">6.1.3 Common types</h4>
<p>All strings that are to provided as input to <acronym>GnuTLS</acronym> functions
should be in UTF-8 unless otherwise specified. Output strings are also
in UTF-8 format unless otherwise specified.
</p>
<p>When data of a fixed size are provided to <acronym>GnuTLS</acronym> functions then
the helper structure <code>gnutls_datum_t</code> is often used. Its definition is
shown below.
</p><pre class="verbatim"> typedef struct
{
unsigned char *data;
unsigned int size;
} gnutls_datum_t;
</pre>
<p>Other functions that require data for scattered read use a structure similar
to <code>struct iovec</code> typically used by <code>readv</code>. It is shown
below.
</p><pre class="verbatim"> typedef struct
{
void *iov_base; /* Starting address */
size_t iov_len; /* Number of bytes to transfer */
} giovec_t;
</pre>
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