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<a href="#libebackend-e-dbhash.description" class="shortcut">Description</a>
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<a name="libebackend-e-dbhash"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libebackend-e-dbhash.top_of_page"></a>e-dbhash</span></h2>
<p>e-dbhash — Simple DB-based hash table for strings</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="libebackend-e-dbhash.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash">EDbHash</a>;
enum <a class="link" href="libebackend-e-dbhash.html#EDbHashStatus" title="enum EDbHashStatus">EDbHashStatus</a>;
<span class="returnvalue">void</span> (<a class="link" href="libebackend-e-dbhash.html#EDbHashFunc" title="EDbHashFunc ()">*EDbHashFunc</a>) (<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);
<a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="returnvalue">EDbHash</span></a> * <a class="link" href="libebackend-e-dbhash.html#e-dbhash-new" title="e_dbhash_new ()">e_dbhash_new</a> (<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-add" title="e_dbhash_add ()">e_dbhash_add</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-remove" title="e_dbhash_remove ()">e_dbhash_remove</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);
<a class="link" href="libebackend-e-dbhash.html#EDbHashStatus" title="enum EDbHashStatus"><span class="returnvalue">EDbHashStatus</span></a> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-compare" title="e_dbhash_compare ()">e_dbhash_compare</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *compare_data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-foreach-key" title="e_dbhash_foreach_key ()">e_dbhash_foreach_key</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHashFunc" title="EDbHashFunc ()"><span class="type">EDbHashFunc</span></a> func</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-write" title="e_dbhash_write ()">e_dbhash_write</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libebackend-e-dbhash.html#e-dbhash-destroy" title="e_dbhash_destroy ()">e_dbhash_destroy</a> (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libebackend-e-dbhash.description"></a><h2>Description</h2>
<p>
An <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> is a simple hash table of strings backed by a Berkeley DB
file for permanent storage.
</p>
</div>
<div class="refsect1">
<a name="libebackend-e-dbhash.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="EDbHash"></a><h3>struct EDbHash</h3>
<pre class="programlisting">struct EDbHash {
EDbHashPrivate *priv;
};
</pre>
<p>
Contains only private data that should be read and manipulated using the
functions below.
</p>
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<tbody><tr>
<td><p><span class="term"><span class="type">EDbHashPrivate</span> *<em class="structfield"><code><a name="EDbHash.priv"></a>priv</code></em>;</span></p></td>
<td>private data</td>
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<div class="refsect2">
<a name="EDbHashStatus"></a><h3>enum EDbHashStatus</h3>
<pre class="programlisting">typedef enum {
E_DBHASH_STATUS_SAME,
E_DBHASH_STATUS_DIFFERENT,
E_DBHASH_STATUS_NOT_FOUND
} EDbHashStatus;
</pre>
<p>
Return codes for <a class="link" href="libebackend-e-dbhash.html#e-dbhash-compare" title="e_dbhash_compare ()"><code class="function">e_dbhash_compare()</code></a>.
</p>
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<td><p><a name="E-DBHASH-STATUS-SAME:CAPS"></a><span class="term"><code class="literal">E_DBHASH_STATUS_SAME</code></span></p></td>
<td> The checksums match.
</td>
</tr>
<tr>
<td><p><a name="E-DBHASH-STATUS-DIFFERENT:CAPS"></a><span class="term"><code class="literal">E_DBHASH_STATUS_DIFFERENT</code></span></p></td>
<td> The checksums differ.
</td>
</tr>
<tr>
<td><p><a name="E-DBHASH-STATUS-NOT-FOUND:CAPS"></a><span class="term"><code class="literal">E_DBHASH_STATUS_NOT_FOUND</code></span></p></td>
<td> The given key was not found.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="EDbHashFunc"></a><h3>EDbHashFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*EDbHashFunc) (<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>
Callback function used in <a class="link" href="libebackend-e-dbhash.html#e-dbhash-foreach-key" title="e_dbhash_foreach_key ()"><code class="function">e_dbhash_foreach_key()</code></a>.
</p>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>a database key</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="libebackend-e-dbhash.html#e-dbhash-foreach-key" title="e_dbhash_foreach_key ()"><code class="function">e_dbhash_foreach_key()</code></a>
</td>
</tr>
</tbody>
</table></div>
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<hr>
<div class="refsect2">
<a name="e-dbhash-new"></a><h3>e_dbhash_new ()</h3>
<pre class="programlisting"><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="returnvalue">EDbHash</span></a> * e_dbhash_new (<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);</pre>
<p>
Creates a new <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> structure and opens the given Berkeley DB file,
creating the DB file if necessary.
</p>
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<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>path to a Berkeley DB file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-add"></a><h3>e_dbhash_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> e_dbhash_add (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *data</code></em>);</pre>
<p>
Adds a database object for <em class="parameter"><code>key</code></em>.
</p>
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<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>a database key</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a database object for <em class="parameter"><code>key</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-remove"></a><h3>e_dbhash_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> e_dbhash_remove (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);</pre>
<p>
Removes the database object corresponding to <em class="parameter"><code>key</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>a database key</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-compare"></a><h3>e_dbhash_compare ()</h3>
<pre class="programlisting"><a class="link" href="libebackend-e-dbhash.html#EDbHashStatus" title="enum EDbHashStatus"><span class="returnvalue">EDbHashStatus</span></a> e_dbhash_compare (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *compare_data</code></em>);</pre>
<p>
Compares <em class="parameter"><code>compare_data</code></em> to the database object corresponding to
<em class="parameter"><code>key</code></em> using an MD5 checksum. Returns <a class="link" href="libebackend-e-dbhash.html#E-DBHASH-STATUS-SAME:CAPS"><span class="type">E_DBHASH_STATUS_SAME</span></a> if the
checksums match, <a class="link" href="libebackend-e-dbhash.html#E-DBHASH-STATUS-DIFFERENT:CAPS"><span class="type">E_DBHASH_STATUS_DIFFERENT</span></a> if the checksums differ,
or <a class="link" href="libebackend-e-dbhash.html#E-DBHASH-STATUS-NOT-FOUND:CAPS"><span class="type">E_DBHASH_STATUS_NOT_FOUND</span></a> if <em class="parameter"><code>key</code></em> is not present in the database.
</p>
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>a database key</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>compare_data</code></em> :</span></p></td>
<td>data to compare against the database</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a checksum comparison status</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-foreach-key"></a><h3>e_dbhash_foreach_key ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> e_dbhash_foreach_key (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>,
<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHashFunc" title="EDbHashFunc ()"><span class="type">EDbHashFunc</span></a> func</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>
Calls <em class="parameter"><code>func</code></em> for each database object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>a callback function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>data to pass to <em class="parameter"><code>func</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-write"></a><h3>e_dbhash_write ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> e_dbhash_write (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>);</pre>
<p>
Flushes database changes to disk.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-dbhash-destroy"></a><h3>e_dbhash_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> e_dbhash_destroy (<em class="parameter"><code><a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a> *edbh</code></em>);</pre>
<p>
Closes the database file and frees the <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>edbh</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-e-dbhash.html#EDbHash" title="struct EDbHash"><span class="type">EDbHash</span></a>
</td>
</tr></tbody>
</table></div>
</div>
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