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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h2><span class="refentrytitle"><a name="GwySerializable.top_of_page"></a>GwySerializable</span></h2>
<p>GwySerializable — Abstract interface for serializable objects</p>
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<a name="GwySerializable.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;libgwyddion/gwyddion.h&gt;

                    <a class="link" href="GwySerializable.html#GwySerializable-struct" title="GwySerializable">GwySerializable</a>;
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        (<a class="link" href="GwySerializable.html#GwySerializeFunc" title="GwySerializeFunc ()">*GwySerializeFunc</a>)                 (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           (<a class="link" href="GwySerializable.html#GwyDeserializeFunc" title="GwyDeserializeFunc ()">*GwyDeserializeFunc</a>)               (<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>);
struct              <a class="link" href="GwySerializable.html#GwySerializableIface" title="struct GwySerializableIface">GwySerializableIface</a>;
                    <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec">GwySerializeSpec</a>;
                    <a class="link" href="GwySerializable.html#GwySerializeValue" title="GwySerializeValue">GwySerializeValue</a>;
                    <a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem">GwySerializeItem</a>;
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        <a class="link" href="GwySerializable.html#gwy-serializable-serialize" title="gwy_serializable_serialize ()">gwy_serializable_serialize</a>          (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           <a class="link" href="GwySerializable.html#gwy-serializable-deserialize" title="gwy_serializable_deserialize ()">gwy_serializable_deserialize</a>        (<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           <a class="link" href="GwySerializable.html#gwy-serializable-duplicate" title="gwy_serializable_duplicate ()">gwy_serializable_duplicate</a>          (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *object</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="GwySerializable.html#gwy-serializable-clone" title="gwy_serializable_clone ()">gwy_serializable_clone</a>              (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *source</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *copy</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GwySerializable.html#gwy-serializable-get-size" title="gwy_serializable_get_size ()">gwy_serializable_get_size</a>           (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GwySerializable.html#gwy-serialize-get-struct-size" title="gwy_serialize_get_struct_size ()">gwy_serialize_get_struct_size</a>       (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GwySerializable.html#gwy-serialize-get-items-size" title="gwy_serialize_get_items_size ()">gwy_serialize_get_items_size</a>        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nitems</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="type">GwySerializeItem</span></a> *items</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        <a class="link" href="GwySerializable.html#gwy-serialize-pack-object-struct" title="gwy_serialize_pack_object_struct ()">gwy_serialize_pack_object_struct</a>    (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="GwySerializable.html#gwy-serialize-unpack-object-struct" title="gwy_serialize_unpack_object_struct ()">gwy_serialize_unpack_object_struct</a>  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GwySerializable.html#gwy-serialize-check-string" title="gwy_serialize_check_string ()">gwy_serialize_check_string</a>          (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *compare_to</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        <a class="link" href="GwySerializable.html#gwy-serialize-object-items" title="gwy_serialize_object_items ()">gwy_serialize_object_items</a>          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nitems</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="type">GwySerializeItem</span></a> *items</code></em>);
<a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="returnvalue">GwySerializeItem</span></a> *  <a class="link" href="GwySerializable.html#gwy-deserialize-object-hash" title="gwy_deserialize_object_hash ()">gwy_deserialize_object_hash</a>         (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *nitems</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GwySerializable.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  GInterface
   +----GwySerializable
</pre>
</div>
<div class="refsect1">
<a name="GwySerializable.prerequisites"></a><h2>Prerequisites</h2>
<p>
GwySerializable requires
 <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>.</p>
</div>
<div class="refsect1">
<a name="GwySerializable.implementations"></a><h2>Known Implementations</h2>
<p>
GwySerializable is implemented by
 <a class="link" href="GwyContainer.html" title="GwyContainer">GwyContainer</a>,  <a class="link" href="GwySIUnit.html" title="GwySIUnit">GwySIUnit</a> and  <a class="link" href="GwyStringList.html" title="GwyStringList">GwyStringList</a>.</p>
</div>
<div class="refsect1">
<a name="GwySerializable.description"></a><h2>Description</h2>
<p>
GwySerializable is an abstract interface for data-like object that can be
serialized and deserialized.  You can serialize any object implementing this
interface with <a class="link" href="GwySerializable.html#gwy-serializable-serialize" title="gwy_serializable_serialize ()"><code class="function">gwy_serializable_serialize()</code></a> and the restore (deserialize) it
with <a class="link" href="GwySerializable.html#gwy-serializable-deserialize" title="gwy_serializable_deserialize ()"><code class="function">gwy_serializable_deserialize()</code></a>. It is also posible it duplicate any
such object with <a class="link" href="GwySerializable.html#gwy-serializable-duplicate" title="gwy_serializable_duplicate ()"><code class="function">gwy_serializable_duplicate()</code></a> and transform one object to
copy of another with <a class="link" href="GwySerializable.html#gwy-serializable-clone" title="gwy_serializable_clone ()"><code class="function">gwy_serializable_clone()</code></a>.
</p>
<p>
Note all <a class="link" href="GwySerializable.html" title="GwySerializable"><span class="type">GwySerializable</span></a> methods work with object `value', whatever it means
for a particular type.  Beside that, objects also have their identity which
is unique and can't be subject of cloning.  It consists of properties like
memory address or references held by object users.  Two important properties
related to identity (and thus NOT retained) are: signals connected to
a particular object and user data set with <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-set-data"><code class="function">g_object_set_data()</code></a> or
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-set-qdata"><code class="function">g_object_set_qdata()</code></a>.
</p>
<p>
You can implement serialization and deserialization in your classes with
<a class="link" href="GwySerializable.html#gwy-serialize-pack-object-struct" title="gwy_serialize_pack_object_struct ()"><code class="function">gwy_serialize_pack_object_struct()</code></a> and <a class="link" href="GwySerializable.html#gwy-serialize-unpack-object-struct" title="gwy_serialize_unpack_object_struct ()"><code class="function">gwy_serialize_unpack_object_struct()</code></a>
or with <a class="link" href="GwySerializable.html#gwy-serialize-object-items" title="gwy_serialize_object_items ()"><code class="function">gwy_serialize_object_items()</code></a> and <a class="link" href="GwySerializable.html#gwy-deserialize-object-hash" title="gwy_deserialize_object_hash ()"><code class="function">gwy_deserialize_object_hash()</code></a>.
The former two are useful for struct-like objects (most objects are of this
kind), the latter two for hash-like objects, i.e., objects that can contain
components of arbitrary name and type.  Serialized size calculations can be
in most cases performed by <a class="link" href="GwySerializable.html#gwy-serialize-get-struct-size" title="gwy_serialize_get_struct_size ()"><code class="function">gwy_serialize_get_struct_size()</code></a> and
<a class="link" href="GwySerializable.html#gwy-serialize-get-items-size" title="gwy_serialize_get_items_size ()"><code class="function">gwy_serialize_get_items_size()</code></a> helper functions.
</p>
</div>
<div class="refsect1">
<a name="GwySerializable.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwySerializable-struct"></a><h3>GwySerializable</h3>
<pre class="programlisting">typedef struct _GwySerializable GwySerializable;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwySerializeFunc"></a><h3>GwySerializeFunc ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        (*GwySerializeFunc)                 (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>);</pre>
<p>
The type of serialization method, see <a class="link" href="GwySerializable.html#gwy-serializable-serialize" title="gwy_serializable_serialize ()"><code class="function">gwy_serializable_serialize()</code></a> for
description.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>serializable</code></em> :</span></p></td>
<td>An object to serialize.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A buffer to append the representation to, may be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> indicating
a new one should be allocated.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<em class="parameter"><code>buffer</code></em> with serialized object appended.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GwyDeserializeFunc"></a><h3>GwyDeserializeFunc ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           (*GwyDeserializeFunc)               (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>);</pre>
<p>
The type of deserialization method, see <a class="link" href="GwySerializable.html#gwy-serializable-deserialize" title="gwy_serializable_deserialize ()"><code class="function">gwy_serializable_deserialize()</code></a> for
description.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A buffer containing a serialized object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The current position in <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created (restored) object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GwySerializableIface"></a><h3>struct GwySerializableIface</h3>
<pre class="programlisting">struct GwySerializableIface {
    GwySerializeFunc serialize;
    GwyDeserializeFunc deserialize;
    void (*clone)(GObject *source, GObject *copy);
    GObject* (*duplicate)(GObject *object);
    gsize (*get_size)(GObject *object);
};
</pre>
<p>
The methods a serializable objects has to implement.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="GwySerializable.html#GwySerializeFunc" title="GwySerializeFunc ()"><span class="type">GwySerializeFunc</span></a> <em class="structfield"><code><a name="GwySerializableIface.serialize"></a>serialize</code></em>;</span></p></td>
<td>Serialization method (obligatory), see <a class="link" href="GwySerializable.html#GwySerializeFunc" title="GwySerializeFunc ()"><span class="type">GwySerializeFunc</span></a> for
description.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GwySerializable.html#GwyDeserializeFunc" title="GwyDeserializeFunc ()"><span class="type">GwyDeserializeFunc</span></a> <em class="structfield"><code><a name="GwySerializableIface.deserialize"></a>deserialize</code></em>;</span></p></td>
<td>Restore method (obligatory), see <a class="link" href="GwySerializable.html#GwyDeserializeFunc" title="GwyDeserializeFunc ()"><span class="type">GwyDeserializeFunc</span></a> for
description.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwySerializableIface.clone"></a>clone</code></em> ()</span></p></td>
<td>Clone method (obligatory).  Copies complete object `value' to an
existing object of the same type.  This method is called from
copy's class if source and copy classes differ.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwySerializableIface.duplicate"></a>duplicate</code></em> ()</span></p></td>
<td>Duplication method (optional).  Creates a duplicate of an
object.  When it is absent, duplication is performed by
a rather inefficient serialize-and-deserialize fallback.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwySerializableIface.get-size"></a>get_size</code></em> ()</span></p></td>
<td>Serialized size calculation method (optional).
Calculates expected serialized object size (including object
name and size header).
Its purpose is to avoid frequent memory reallocations during
serialization of large objects.
The returned value may be inexact, a reasonable upper bound is
sufficient.  When it is absent, serialization is less efficient.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GwySerializeSpec"></a><h3>GwySerializeSpec</h3>
<pre class="programlisting">typedef struct {
    guchar ctype;
    const guchar *name;
    gpointer value;
    guint32 *array_size;
} GwySerializeSpec;
</pre>
<p>
A structure containing information for one object/struct component
serialization or deserialization.
</p>
<p>
This component information is used in <a class="link" href="GwySerializable.html#gwy-serialize-pack-object-struct" title="gwy_serialize_pack_object_struct ()"><code class="function">gwy_serialize_pack_object_struct()</code></a>
and <a class="link" href="GwySerializable.html#gwy-serialize-unpack-object-struct" title="gwy_serialize_unpack_object_struct ()"><code class="function">gwy_serialize_unpack_object_struct()</code></a> suitable for (de)serialization
of struct-like objects.
</p>
<p>
Following atomic component types (<em class="parameter"><code>ctype</code></em>'s) exist:
<code class="literal">'b'</code> for a boolean,
<code class="literal">'c'</code> for a character,
<code class="literal">'i'</code> for a 32bit integer,
<code class="literal">'q'</code> for a 64bit integer,
<code class="literal">'d'</code> for a gdouble,
<code class="literal">'s'</code> for a nul-terminated string,
<code class="literal">'o'</code> for a serializable object.
</p>
<p>
And array component types:
<code class="literal">'C'</code> for a character array,
<code class="literal">'I'</code> for a 32bit integer array,
<code class="literal">'Q'</code> for a 64bit integer array,
<code class="literal">'D'</code> for a gdouble array,
<code class="literal">'S'</code> for an array of nul-terminated strings,
<code class="literal">'O'</code> for an array of objects.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> <em class="structfield"><code><a name="GwySerializeSpec.ctype"></a>ctype</code></em>;</span></p></td>
<td>Component type, see description body for possible values.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *<em class="structfield"><code><a name="GwySerializeSpec.name"></a>name</code></em>;</span></p></td>
<td>Component name as a nul-terminated string.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GwySerializeSpec.value"></a>value</code></em>;</span></p></td>
<td>Pointer to component (always add one level of indirection; for
an object, a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a>** pointer should be stored).  If it is
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the component is ignored.  For serialization it means it
is not serialized, for deserialization it means its existence
is acknowledged (no unknown component warning) but it's skipped
instead of unpacking.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GwySerializeSpec.array-size"></a>array_size</code></em>;</span></p></td>
<td>Pointer to array size if component is an array, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GwySerializeValue"></a><h3>GwySerializeValue</h3>
<pre class="programlisting">typedef union {
    gboolean v_boolean;
    guchar v_char;
    guint32 v_int32;
    guint64 v_int64;
    gdouble v_double;
    guchar *v_string;
    GObject *v_object;
    gboolean *v_boolean_array;
    guchar *v_char_array;
    guint32 *v_int32_array;
    guint64 *v_int64_array;
    gdouble *v_double_array;
    guchar **v_string_array;
    GObject **v_object_array;
} GwySerializeValue;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwySerializeItem"></a><h3>GwySerializeItem</h3>
<pre class="programlisting">typedef struct {
    guchar ctype;
    const guchar *name;
    GwySerializeValue value;
    guint32 array_size;
} GwySerializeItem;
</pre>
<p>
A structure containing information for one object/struct component
serialization or deserialization.
</p>
<p>
This component information is used in <a class="link" href="GwySerializable.html#gwy-serialize-object-items" title="gwy_serialize_object_items ()"><code class="function">gwy_serialize_object_items()</code></a> and
<a class="link" href="GwySerializable.html#gwy-deserialize-object-hash" title="gwy_deserialize_object_hash ()"><code class="function">gwy_deserialize_object_hash()</code></a> suitable for (de)serialization of hash-like
objects.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> <em class="structfield"><code><a name="GwySerializeItem.ctype"></a>ctype</code></em>;</span></p></td>
<td>Component type, see <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> for details.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *<em class="structfield"><code><a name="GwySerializeItem.name"></a>name</code></em>;</span></p></td>
<td>Component name as a nul-terminated string.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GwySerializable.html#GwySerializeValue" title="GwySerializeValue"><span class="type">GwySerializeValue</span></a> <em class="structfield"><code><a name="GwySerializeItem.value"></a>value</code></em>;</span></p></td>
<td>Component value.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GwySerializeItem.array-size"></a>array_size</code></em>;</span></p></td>
<td>Array size if component is an array, unused otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serializable-serialize"></a><h3>gwy_serializable_serialize ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        gwy_serializable_serialize          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>);</pre>
<p>
Serializes an object to byte buffer.
</p>
<p>
This is a high-level method.  Do not use it for implementation of child
object serialization (should you ever need to do it manually), it would
lead to repeated required buffer size calculations.  In such a case, use
<code class="function">gwy_serializable_do_serialize()</code> FIXME: but that's not public.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>serializable</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GwySerializable.html" title="GwySerializable"><span class="type">GwySerializable</span></a> interface.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A buffer to which the serialized object should be appended,
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to allocate and return a new <a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<em class="parameter"><code>buffer</code></em> or a newly allocated <a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> with serialized
object appended.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serializable-deserialize"></a><h3>gwy_serializable_deserialize ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           gwy_serializable_deserialize        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>);</pre>
<p>
Restores a serialized object from byte buffer.
</p>
<p>
The newly created object has reference count according to its nature, thus
a <a href="/usr/share/gtk-doc/html/gtk2/GtkObject.html"><span class="type">GtkObject</span></a> will have a floating reference, a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> will have a
refcount of 1, etc.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A block of memory of size <em class="parameter"><code>size</code></em> contaning object representation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The position of the object in <em class="parameter"><code>buffer</code></em>, it's updated to
point after it.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created object.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serializable-duplicate"></a><h3>gwy_serializable_duplicate ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="returnvalue">GObject</span></a> *           gwy_serializable_duplicate          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *object</code></em>);</pre>
<p>
Creates a copy of an object.
</p>
<p>
If the object doesn't support duplication natively, it's brute-force
serialized and then deserialized, this may be quite inefficient,
namely for large objects.
</p>
<p>
You can duplicate a <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, too, but you are discouraged from doing it.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>An object implementing <a class="link" href="GwySerializable.html" title="GwySerializable"><span class="type">GwySerializable</span></a> interface.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly created object copy.  However if the object is a
singleton, <em class="parameter"><code>object</code></em> itself (with incremented reference count)
can be returned, too.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serializable-clone"></a><h3>gwy_serializable_clone ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gwy_serializable_clone              (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *source</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *copy</code></em>);</pre>
<p>
Makes an object identical to another object of the same type.
</p>
<p>
More precisely, <em class="parameter"><code>source</code></em> may be subclass of <em class="parameter"><code>copy</code></em> (the extra information
is lost then).
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source</code></em> :</span></p></td>
<td>An object implementing <a class="link" href="GwySerializable.html" title="GwySerializable"><span class="type">GwySerializable</span></a> interface.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>copy</code></em> :</span></p></td>
<td>An object of the same type as <em class="parameter"><code>source</code></em> to modify after it.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serializable-get-size"></a><h3>gwy_serializable_get_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               gwy_serializable_get_size           (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> *serializable</code></em>);</pre>
<p>
Calculates the expected size of serialized object.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>serializable</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GwySerializable.html" title="GwySerializable"><span class="type">GwySerializable</span></a> interface.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The expected size of serialized <em class="parameter"><code>serializable</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-get-struct-size"></a><h3>gwy_serialize_get_struct_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               gwy_serialize_get_struct_size       (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);</pre>
<p>
Calculates serialized object size for struct-like objects.
</p>
<p>
The component specification is the same as in
<a class="link" href="GwySerializable.html#gwy-serialize-pack-object-struct" title="gwy_serialize_pack_object_struct ()"><code class="function">gwy_serialize_pack_object_struct()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type name of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nspec</code></em> :</span></p></td>
<td>The number of items in <em class="parameter"><code>spec</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spec</code></em> :</span></p></td>
<td>The components to serialize.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Serialized object size, it included space for object name and size.
The value is exact unless some components are objects that do not
return exact size estimate themselves.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-get-items-size"></a><h3>gwy_serialize_get_items_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               gwy_serialize_get_items_size        (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nitems</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="type">GwySerializeItem</span></a> *items</code></em>);</pre>
<p>
Calculates serialized object size for hash-like objects.
</p>
<p>
The component specification is the same as in
<a class="link" href="GwySerializable.html#gwy-serialize-object-items" title="gwy_serialize_object_items ()"><code class="function">gwy_serialize_object_items()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type name of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nitems</code></em> :</span></p></td>
<td>The number of <em class="parameter"><code>items</code></em> items.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>items</code></em> :</span></p></td>
<td>The components to serialize.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Serialized object size, it included space for object name and size.
The value is exact unless some components are objects that do not
return exact size estimate themselves.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-pack-object-struct"></a><h3>gwy_serialize_pack_object_struct ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        gwy_serialize_pack_object_struct    (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);</pre>
<p>
Appends serialization of object with <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-name"><code class="function">g_type_name()</code></a> <em class="parameter"><code>object_name</code></em> and
components described by <em class="parameter"><code>spec</code></em> to <em class="parameter"><code>buffer</code></em> in gwy-file format.
</p>
<p>
Here's how a serialization method of a simple object whose state is
described by a single real number foo could look (without error checking):
</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar">guchar</a></span><span class="symbol">*</span>
<span class="function">my_object_serialize</span><span class="symbol">(</span><span class="usertype">GObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">obj</span><span class="symbol">,</span>
<span class="normal">                    </span><span class="usertype">guchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">buffer</span><span class="symbol">,</span>
<span class="normal">                    </span><span class="usertype">gsize</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">size</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal">    </span><span class="usertype">MyObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">my_object </span><span class="symbol">=</span><span class="normal"> </span><span class="function">MY_OBJECT</span><span class="symbol">(</span><span class="normal">obj</span><span class="symbol">);</span>
<span class="normal">    </span><span class="usertype">GwySerializeSpec</span><span class="normal"> spec</span><span class="symbol">[]</span><span class="normal"> </span><span class="symbol">=</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">        </span><span class="cbracket">{</span><span class="normal"> </span><span class="string">'d'</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"foo"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">my_object</span><span class="symbol">-&gt;</span><span class="normal">foo</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> </span><span class="cbracket">}</span><span class="symbol">,</span>
<span class="normal">    </span><span class="cbracket">}</span><span class="symbol">;</span>

<span class="normal">    </span><span class="keyword">return</span><span class="normal"> </span><span class="function"><a href="#gwy-serialize-pack-object-struct">gwy_serialize_pack_object_struct</a></span><span class="symbol">(</span><span class="normal">buffer</span><span class="symbol">,</span><span class="normal"> size</span><span class="symbol">,</span>
<span class="normal">                                            </span><span class="string">"MyObject"</span><span class="symbol">,</span>
<span class="normal">                                            </span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#G-N-ELEMENTS:CAPS">G_N_ELEMENTS</a></span><span class="symbol">(</span><span class="normal">spec</span><span class="symbol">),</span><span class="normal"> spec</span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A buffer to which the serialized components should be appended.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type name of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nspec</code></em> :</span></p></td>
<td>The number of items in <em class="parameter"><code>spec</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spec</code></em> :</span></p></td>
<td>The components to serialize.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The buffer with serialization of <em class="parameter"><code>spec</code></em> components appended.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-unpack-object-struct"></a><h3>gwy_serialize_unpack_object_struct ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gwy_serialize_unpack_object_struct  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nspec</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a> *spec</code></em>);</pre>
<p>
Deserializes an object with named components packed into gwy-file format by
<a class="link" href="GwySerializable.html#gwy-serialize-pack-object-struct" title="gwy_serialize_pack_object_struct ()"><code class="function">gwy_serialize_pack_object_struct()</code></a>.
</p>
<p>
Extra components are ignored (but cause a warning), components of different
type than expected cause failure, missing components are not detected.
</p>
<p>
It is safe to pass pointers to existing non-atomic objects (strings, arrays,
objects) in <em class="parameter"><code>spec</code></em> values, they will be dereferenced and freed as necessary
when an unpacked value is about to replace them.
For the same reason it is an error to pass pointers to unintialized memory
there, always initialize non-atomic <em class="parameter"><code>spec</code></em> values to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> pointers, at
least.
</p>
<p>
Caller is responsible for use/clean-up of these values if deserialization
succeeds or not.
</p>
<p>
Here's how a deserialization method of a simple object whose state is
described by a single real number <em class="parameter"><code>foo</code></em> could look (without error checking):
</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a></span><span class="symbol">*</span>
<span class="function">my_object_deserialize</span><span class="symbol">(</span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">guchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">buffer</span><span class="symbol">,</span>
<span class="normal">                      </span><span class="usertype">gsize</span><span class="normal"> size</span><span class="symbol">,</span>
<span class="normal">                      </span><span class="usertype">gsize</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">position</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal">    </span><span class="type">double</span><span class="normal"> foo </span><span class="symbol">=</span><span class="normal"> </span><span class="number">1.0</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">GwySerializeSpec</span><span class="normal"> spec</span><span class="symbol">[]</span><span class="normal"> </span><span class="symbol">=</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">        </span><span class="cbracket">{</span><span class="normal"> </span><span class="string">'d'</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"foo"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">foo</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> </span><span class="cbracket">}</span><span class="symbol">,</span>
<span class="normal">    </span><span class="cbracket">}</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">MyObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">my_object</span><span class="symbol">;</span>

<span class="normal">    </span><span class="function"><a href="#gwy-serialize-unpack-object-struct">gwy_serialize_unpack_object_struct</a></span><span class="symbol">(</span><span class="normal">buffer</span><span class="symbol">,</span><span class="normal"> size</span><span class="symbol">,</span><span class="normal"> position</span><span class="symbol">,</span>
<span class="normal">                                       </span><span class="string">"MyObject"</span><span class="symbol">,</span>
<span class="normal">                                       </span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#G-N-ELEMENTS:CAPS">G_N_ELEMENTS</a></span><span class="symbol">(</span><span class="normal">spec</span><span class="symbol">),</span><span class="normal"> spec</span><span class="symbol">);</span>
<span class="normal">    </span><span class="keyword">return</span><span class="normal"> </span><span class="function">my_object_new</span><span class="symbol">(</span><span class="normal">foo</span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A memory location containing a serialized object at position
<em class="parameter"><code>position</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>Current size of <em class="parameter"><code>buffer</code></em>, new size is returned here.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The position of the object in <em class="parameter"><code>buffer</code></em>, it's updated to point
after it.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type name of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nspec</code></em> :</span></p></td>
<td>The number of items in <em class="parameter"><code>spec</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spec</code></em> :</span></p></td>
<td>The components to deserialize.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Whether the unpacking succeeded
(see description body for definition of success and failure).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-check-string"></a><h3>gwy_serialize_check_string ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               gwy_serialize_check_string          (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *compare_to</code></em>);</pre>
<p>
Check whether <em class="parameter"><code>size</code></em> bytes of memory in <em class="parameter"><code>buffer</code></em> can be interpreted as a
nul-terminated string, and eventually whether it's equal to <em class="parameter"><code>compare_to</code></em>.
</p>
<p>
When <em class="parameter"><code>compare_to</code></em> is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the comparsion is not performed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A memory location containing a nul-terminated string at position
<em class="parameter"><code>position</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The position of the string in <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>compare_to</code></em> :</span></p></td>
<td>String to compare <em class="parameter"><code>buffer</code></em> to, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The length of the nul-terminated string including the nul
character; zero otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-serialize-object-items"></a><h3>gwy_serialize_object_items ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="returnvalue">GByteArray</span></a> *        gwy_serialize_object_items          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> nitems</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="type">GwySerializeItem</span></a> *items</code></em>);</pre>
<p>
Serializes an object to buffer in gwy-file format.
</p>
<p>
More precisely, it appends serialization of object with <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-name"><code class="function">g_type_name()</code></a>
<em class="parameter"><code>object_name</code></em> with components described by <em class="parameter"><code>items</code></em> to <em class="parameter"><code>buffer</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A buffer to which the serialized components should be appended,
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nitems</code></em> :</span></p></td>
<td>The number of <em class="parameter"><code>items</code></em> items.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>items</code></em> :</span></p></td>
<td>The components to serialize.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<em class="parameter"><code>buffer</code></em> or a newly allocated <a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a> with serialization of
<em class="parameter"><code>items</code></em> components appended.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-deserialize-object-hash"></a><h3>gwy_deserialize_object_hash ()</h3>
<pre class="programlisting"><a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="returnvalue">GwySerializeItem</span></a> *  gwy_deserialize_object_hash         (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *position</code></em>,
                                                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *object_name</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> *nitems</code></em>);</pre>
<p>
Deserializes an object with arbitrary components from gwy-file format.
</p>
<p>
This function works like <a class="link" href="GwySerializable.html#gwy-serialize-unpack-object-struct" title="gwy_serialize_unpack_object_struct ()"><code class="function">gwy_serialize_unpack_object_struct()</code></a>, except that
it does not use any a priori knowledge of what the object contains.  So
instead of filling values in supplied <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a>'s, it constructs
<a class="link" href="GwySerializable.html#GwySerializeItem" title="GwySerializeItem"><span class="type">GwySerializeItem</span></a>'s completely from what is found in <em class="parameter"><code>buffer</code></em>.  It does
considerably less sanity checks and even allows several components of the
same name.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>A block of memory of size <em class="parameter"><code>size</code></em> contaning object representation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>Current position in buffer, will be updated to point after
object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_name</code></em> :</span></p></td>
<td>The type name of the object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>nitems</code></em> :</span></p></td>
<td>Where the number of deserialized components should be stored.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated array of deserialized components.  Note the
<em class="parameter"><code>name</code></em> fields of <a class="link" href="GwySerializable.html#GwySerializeSpec" title="GwySerializeSpec"><span class="type">GwySerializeSpec</span></a>'s point to <em class="parameter"><code>buffer</code></em> and thus are
valid only as long as <em class="parameter"><code>buffer</code></em> is; any arrays or strings are newly
allocated and must be reused or freed by caller.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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