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<h2><span class="refentrytitle"><a name="libgwyapp-file-module-utils.top_of_page"></a>file module utils</span></h2>
<p>file module utils — Utility functions for file modules</p>
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<a name="libgwyapp-file-module-utils.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;app/gwymoduleutils-file.h&gt;

<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gboolean8" title="gwy_get_gboolean8 ()">gwy_get_gboolean8</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint16"><span class="returnvalue">gint16</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint16-le" title="gwy_get_gint16_le ()">gwy_get_gint16_le</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint16"><span class="returnvalue">gint16</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint16-be" title="gwy_get_gint16_be ()">gwy_get_gint16_be</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint16-le" title="gwy_get_guint16_le ()">gwy_get_guint16_le</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint16-be" title="gwy_get_guint16_be ()">gwy_get_guint16_be</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint32"><span class="returnvalue">gint32</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint32-le" title="gwy_get_gint32_le ()">gwy_get_gint32_le</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint32"><span class="returnvalue">gint32</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint32-be" title="gwy_get_gint32_be ()">gwy_get_gint32_be</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> **ppv</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint32-le" title="gwy_get_guint32_le ()">gwy_get_guint32_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint32-be" title="gwy_get_guint32_be ()">gwy_get_guint32_be</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint64-le" title="gwy_get_gint64_le ()">gwy_get_gint64_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint64-be" title="gwy_get_gint64_be ()">gwy_get_gint64_be</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint64-le" title="gwy_get_guint64_le ()">gwy_get_guint64_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-guint64-be" title="gwy_get_guint64_be ()">gwy_get_guint64_be</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gfloat-le" title="gwy_get_gfloat_le ()">gwy_get_gfloat_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gfloat-be" title="gwy_get_gfloat_be ()">gwy_get_gfloat_be</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gdouble-le" title="gwy_get_gdouble_le ()">gwy_get_gdouble_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gdouble-be" title="gwy_get_gdouble_be ()">gwy_get_gdouble_be</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-pascal-real-le" title="gwy_get_pascal_real_le ()">gwy_get_pascal_real_le</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> **ppv</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-pascal-real-be" title="gwy_get_pascal_real_be ()">gwy_get_pascal_real_be</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> **ppv</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="libgwyapp-file-module-utils.html#gwy-app-channel-check-nonsquare" title="gwy_app_channel_check_nonsquare ()">gwy_app_channel_check_nonsquare</a>     (<em class="parameter"><code><a href="../libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> id</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="libgwyapp-file-module-utils.html#gwy-app-channel-title-fall-back" title="gwy_app_channel_title_fall_back ()">gwy_app_channel_title_fall_back</a>     (<em class="parameter"><code><a href="../libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> id</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="libgwyapp-file-module-utils.html#gwy-app-channel-remove-bad-data" title="gwy_app_channel_remove_bad_data ()">gwy_app_channel_remove_bad_data</a>     (<em class="parameter"><code><a href="../libgwyprocess/GwyDataField.html"><span class="type">GwyDataField</span></a> *dfield</code></em>,
                                                         <em class="parameter"><code><a href="../libgwyprocess/GwyDataField.html"><span class="type">GwyDataField</span></a> *mfield</code></em>);
#define             <a class="link" href="libgwyapp-file-module-utils.html#GWY-TEXT-HEADER-ERROR:CAPS" title="GWY_TEXT_HEADER_ERROR">GWY_TEXT_HEADER_ERROR</a>
enum                <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderError" title="enum GwyTextHeaderError">GwyTextHeaderError</a>;
                    <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderParser" title="GwyTextHeaderParser">GwyTextHeaderParser</a>;
<a href="/usr/share/gtk-doc/html/glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>              <a class="link" href="libgwyapp-file-module-utils.html#gwy-text-header-error-quark" title="gwy_text_header_error_quark ()">gwy_text_header_error_quark</a>         (<em class="parameter"><code><span class="type">void</span></code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Hash-Tables.html#GHashTable"><span class="returnvalue">GHashTable</span></a> *        <a class="link" href="libgwyapp-file-module-utils.html#gwy-text-header-parse" title="gwy_text_header_parse ()">gwy_text_header_parse</a>               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *header</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderParser" title="GwyTextHeaderParser"><span class="type">GwyTextHeaderParser</span></a> *parser</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       <a class="link" href="libgwyapp-file-module-utils.html#gwy-text-header-context-get-section" title="gwy_text_header_context_get_section ()">gwy_text_header_context_get_section</a> (<em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext"><span class="type">GwyTextHeaderContext</span></a> *context</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="libgwyapp-file-module-utils.html#gwy-text-header-context-get-lineno" title="gwy_text_header_context_get_lineno ()">gwy_text_header_context_get_lineno</a>  (<em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext"><span class="type">GwyTextHeaderContext</span></a> *context</code></em>);
                    <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext">GwyTextHeaderContext</a>;
</pre>
</div>
<div class="refsect1">
<a name="libgwyapp-file-module-utils.description"></a><h2>Description</h2>
<p>
Functions <a class="link" href="libgwyapp-file-module-utils.html#gwy-app-channel-check-nonsquare" title="gwy_app_channel_check_nonsquare ()"><code class="function">gwy_app_channel_check_nonsquare()</code></a> and
<a class="link" href="libgwyapp-file-module-utils.html#gwy-app-channel-title-fall-back" title="gwy_app_channel_title_fall_back ()"><code class="function">gwy_app_channel_title_fall_back()</code></a> perform common tasks improving the
imported of channels from foreign data files.  Typically one calls them on
all imported channel ids after storing the data fields the the container,
if they are useful for a given file type.
</p>
<p>
The group of functions <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint16-le" title="gwy_get_gint16_le ()"><code class="function">gwy_get_gint16_le()</code></a>, <a class="link" href="libgwyapp-file-module-utils.html#gwy-get-gint16-be" title="gwy_get_gint16_be ()"><code class="function">gwy_get_gint16_be()</code></a>, etc.
is intended to portably read packed binary data structures that are commonly
found in SPM files.  They all work identically: the binary data value is
read from the buffer, converted if necessary, and the provided
buffer pointer is moved to point after the value to faciliate sequential
reading.
</p>
<p>
As no buffer size is passed, obviously no buffer size checking is performed.
The caller has to ensure the buffer is large enough -- it is expected the
caller checks the total buffer size before starting to parse it.
</p>
<p>
For example to portably read the following packed struct stored
in big-endian byte order:
</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</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="keyword">struct</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">    </span><span class="usertype">guint16</span><span class="normal"> xres</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">guint16</span><span class="normal"> yres</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">gfloat</span><span class="normal"> measure</span><span class="symbol">;</span>
<span class="cbracket">}</span><span class="normal"> header</span><span class="symbol">;</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
one can do (after checking the buffer size):
</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</pre></td>
        <td class="listing_code"><pre class="programlisting"><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">p </span><span class="symbol">=</span><span class="normal"> buffer</span><span class="symbol">;</span>
<span class="normal">header</span><span class="symbol">.</span><span class="normal">xres    </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-get-guint16-be">gwy_get_guint16_be</a></span><span class="symbol">(&amp;</span><span class="normal">p</span><span class="symbol">);</span>
<span class="normal">header</span><span class="symbol">.</span><span class="normal">yres    </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-get-guint16-be">gwy_get_guint16_be</a></span><span class="symbol">(&amp;</span><span class="normal">p</span><span class="symbol">);</span>
<span class="normal">header</span><span class="symbol">.</span><span class="normal">measure </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-get-gfloat-be">gwy_get_gfloat_be</a></span><span class="symbol">(&amp;</span><span class="normal">p</span><span class="symbol">);</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
and <em class="parameter"><code>p</code></em> will point after <em class="parameter"><code>measure</code></em> in <em class="parameter"><code>buffer</code></em> after this snippet is finished.
</p>
<p>
The data types used in <em class="parameter"><code>header</code></em> do not matter (provided they are large
enough to hold the values), the exact types are determined by the functions
used.  Therefore the reading would work identically if <em class="parameter"><code>header</code></em> was defined
using common types:
</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</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="keyword">struct</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">    </span><span class="usertype">gint</span><span class="normal"> xres</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">gint</span><span class="normal"> yres</span><span class="symbol">;</span>
<span class="normal">    </span><span class="usertype">gdouble</span><span class="normal"> measure</span><span class="symbol">;</span>
<span class="cbracket">}</span><span class="normal"> header</span><span class="symbol">;</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
</p>
</div>
<div class="refsect1">
<a name="libgwyapp-file-module-utils.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gwy-get-gboolean8"></a><h3>gwy_get_gboolean8 ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gwy_get_gboolean8                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a boolean value stored as a signle byte from a
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to boolean (stored as a signle byte)
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint16-le"></a><h3>gwy_get_gint16_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint16"><span class="returnvalue">gint16</span></a>              gwy_get_gint16_le                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 16bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian signed 16bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint16"><span class="type">gint16</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint16-be"></a><h3>gwy_get_gint16_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint16"><span class="returnvalue">gint16</span></a>              gwy_get_gint16_be                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 16bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian signed 16bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint16"><span class="type">gint16</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint16-le"></a><h3>gwy_get_guint16_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>             gwy_get_guint16_le                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 16bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian unsigned 16bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="type">guint16</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint16-be"></a><h3>gwy_get_guint16_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>             gwy_get_guint16_be                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 16bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian unsigned 16bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="type">guint16</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint32-le"></a><h3>gwy_get_gint32_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint32"><span class="returnvalue">gint32</span></a>              gwy_get_gint32_le                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 32bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian signed 32bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint32"><span class="type">gint32</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint32-be"></a><h3>gwy_get_gint32_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint32"><span class="returnvalue">gint32</span></a>              gwy_get_gint32_be                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 32bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian signed 32bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint32"><span class="type">gint32</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint32-le"></a><h3>gwy_get_guint32_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>             gwy_get_guint32_le                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 32bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian unsigned 32bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint32-be"></a><h3>gwy_get_guint32_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>             gwy_get_guint32_be                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 32bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian unsigned 32bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint64-le"></a><h3>gwy_get_gint64_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              gwy_get_gint64_le                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 64bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian signed 64bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gint64-be"></a><h3>gwy_get_gint64_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="returnvalue">gint64</span></a>              gwy_get_gint64_be                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a signed 64bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian signed 64bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint64-le"></a><h3>gwy_get_guint64_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             gwy_get_guint64_le                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 64bit integer value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian unsigned 64bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-guint64-be"></a><h3>gwy_get_guint64_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="returnvalue">guint64</span></a>             gwy_get_guint64_be                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads an unsigned 64bit integer value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian unsigned 64bit integer
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gfloat-le"></a><h3>gwy_get_gfloat_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              gwy_get_gfloat_le                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a single-precision IEEE float value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian single-precision IEEE float
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gfloat-be"></a><h3>gwy_get_gfloat_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="returnvalue">gfloat</span></a>              gwy_get_gfloat_be                   (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a single-precision IEEE float value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian single-precision IEEE float
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gdouble-le"></a><h3>gwy_get_gdouble_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             gwy_get_gdouble_le                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a double-precision IEEE float value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian double-precision IEEE float
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-gdouble-be"></a><h3>gwy_get_gdouble_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             gwy_get_gdouble_be                  (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a double-precision IEEE float value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian double-precision IEEE float
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value read from the buffer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-pascal-real-le"></a><h3>gwy_get_pascal_real_le ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             gwy_get_pascal_real_le              (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a six-byte Pascale Real value from a little-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a little-endian six-byte Pascal Real
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The floating point value read from the buffer as a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-get-pascal-real-be"></a><h3>gwy_get_pascal_real_be ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>             gwy_get_pascal_real_be              (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **ppv</code></em>);</pre>
<p>
Reads a six-byte Pascale Real value from a big-endian
binary data buffer, moving the buffer pointer to point just after the value.
</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>ppv</code></em> :</span></p></td>
<td>Pointer to a pointer to a big-endian six-byte Pascal Real
in a memory buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The floating point value read from the buffer as a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-app-channel-check-nonsquare"></a><h3>gwy_app_channel_check_nonsquare ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gwy_app_channel_check_nonsquare     (<em class="parameter"><code><a href="../libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> id</code></em>);</pre>
<p>
Sets `realsquare' for a channel highly non-square pixels.
</p>
<p>
The threshold for highly non-square is somewhat arbitrary.
Fortunately, most files encoutered in practice have the measure ratio either
very close to 1, larger or equal than 2.
</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>data</code></em> :</span></p></td>
<td>A data container.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>Data channel id.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the channel was found to have highly non-square pixels
and `realsquare' was set (otherwise it was unset).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-app-channel-title-fall-back"></a><h3>gwy_app_channel_title_fall_back ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gwy_app_channel_title_fall_back     (<em class="parameter"><code><a href="../libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> id</code></em>);</pre>
<p>
Adds a channel title based on data field units.
</p>
<p>
The guess is very simple, but probably better than `Unknown channel' in
most cases.  If there already is a title it is left intact, making use of
this function as a fall-back easier.
</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>data</code></em> :</span></p></td>
<td>A data container.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>Data channel id.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the title was set (either by this function or before).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-app-channel-remove-bad-data"></a><h3>gwy_app_channel_remove_bad_data ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               gwy_app_channel_remove_bad_data     (<em class="parameter"><code><a href="../libgwyprocess/GwyDataField.html"><span class="type">GwyDataField</span></a> *dfield</code></em>,
                                                         <em class="parameter"><code><a href="../libgwyprocess/GwyDataField.html"><span class="type">GwyDataField</span></a> *mfield</code></em>);</pre>
<p>
Replaces bad data points with some neutral values.
</p>
<p>
Since Gwyddion has no concept of bad data points, they are usually marked
with a mask and replaced with some neutral values upon import, leaving the
user to decide how to proceed further.  This helper function performs such
replacement, using the average of all good points as the neutral replacement
value (at this moment).
</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>dfield</code></em> :</span></p></td>
<td>A data field.  The values of bad data points are ignored and might
be even left uninitialized.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mfield</code></em> :</span></p></td>
<td>A mask field containing 1.0 in place of good data points, 0.0 in
place of bad points.  It will be inverted to become the mask of
bad points.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of bad data points replaced.  If zero is returned, all
points are good and there is no need for masking.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.14</p>
</div>
<hr>
<div class="refsect2">
<a name="GWY-TEXT-HEADER-ERROR:CAPS"></a><h3>GWY_TEXT_HEADER_ERROR</h3>
<pre class="programlisting">#define GWY_TEXT_HEADER_ERROR gwy_text_header_error_quark()
</pre>
<p>
Error domain for text header parsing. Errors in this domain will be from the
<a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderError" title="enum GwyTextHeaderError"><span class="type">GwyTextHeaderError</span></a> enumeration. See <a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> for information on error
domains.
</p>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTextHeaderError"></a><h3>enum GwyTextHeaderError</h3>
<pre class="programlisting">typedef enum {
    GWY_TEXT_HEADER_ERROR_SECTION_NAME,
    GWY_TEXT_HEADER_ERROR_SECTION_END,
    GWY_TEXT_HEADER_ERROR_SECTION_START,
    GWY_TEXT_HEADER_ERROR_PREFIX,
    GWY_TEXT_HEADER_ERROR_GARBAGE,
    GWY_TEXT_HEADER_ERROR_KEY,
    GWY_TEXT_HEADER_ERROR_VALUE,
    GWY_TEXT_HEADER_ERROR_TERMINATOR,
} GwyTextHeaderError;
</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-SECTION-NAME:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_SECTION_NAME</code></span></p></td>
<td>Section name is invalid.  It is raised
                                     by the parser only for an empty section
                                     name.
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-SECTION-END:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_SECTION_END</code></span></p></td>
<td>Section ended when a different section
                                    or no section was open.  Note that
                                    <a class="link" href="libgwyapp-file-module-utils.html#gwy-text-header-context-get-section" title="gwy_text_header_context_get_section ()"><code class="function">gwy_text_header_context_get_section()</code></a>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-SECTION-START:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_SECTION_START</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-PREFIX:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_PREFIX</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-GARBAGE:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_GARBAGE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-KEY:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_KEY</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-VALUE:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_VALUE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="GWY-TEXT-HEADER-ERROR-TERMINATOR:CAPS"></a><span class="term"><code class="literal">GWY_TEXT_HEADER_ERROR_TERMINATOR</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTextHeaderParser"></a><h3>GwyTextHeaderParser</h3>
<pre class="programlisting">typedef struct {
    const gchar *comment_prefix;
    const gchar *section_template;
    const gchar *endsection_template;
    const gchar *section_accessor;
    const gchar *line_prefix;
    const gchar *key_value_separator;
    const gchar *terminator;
    gboolean (*item)(const GwyTextHeaderContext *context,
                     GHashTable *hash,
                     gchar *key,
                     gchar *value,
                     gpointer user_data,
                     GError **error);
    gboolean (*section)(const GwyTextHeaderContext *context,
                        const gchar *name,
                        gpointer user_data,
                        GError **error);
    gboolean (*endsection)(const GwyTextHeaderContext *context,
                           const gchar *name,
                           gpointer user_data,
                           GError **error);
    void (*end)(const GwyTextHeaderContext *context,
                gsize length,
                gpointer user_data);
    gboolean (*error)(const GwyTextHeaderContext *context,
                      GError *error,
                      gpointer user_data);
    GDestroyNotify destroy_key;
    GDestroyNotify destroy_value;
} GwyTextHeaderParser;
</pre>
<p>
Text header parser specification.
</p>
<p>
Memory considerations: In general, the parser attempts to reuse the contents
of <em class="parameter"><code>header</code></em> directly for the hash keys and values.  There are two cases when
it cannot: sectioning implies that keys must be constructed dynamically
and the use of <em class="parameter"><code>item</code></em> callback means the parser has no control on what is
inserted into the hash table.
</p>
<p>
This means that the <em class="parameter"><code>item</code></em> callback must free <em class="parameter"><code>key</code></em> if sectioning is used and
it is not going to actually use it as the hash table key.  And, of course,
suitable <em class="parameter"><code>destroy_key</code></em> and <em class="parameter"><code>destroy_value</code></em> functions must be set.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.comment-prefix"></a>comment_prefix</code></em>;</span></p></td>
<td>Prefix denoting comment lines.  It is possible to specify
multiple prefixes by separating them with newline ("\n").</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.section-template"></a>section_template</code></em>;</span></p></td>
<td>Section start template.  It must contain the character
"\x1a" in the place where the section name apprears.
Example: "[Section \x1a]".</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.endsection-template"></a>endsection_template</code></em>;</span></p></td>
<td>Section end template.  It may or may not contain the
substitute character "\x1a" depending on whether the
section end markers contain the section name.  It is
invalid to set <em class="parameter"><code>endsection_template</code></em> without setting
<em class="parameter"><code>section_template</code></em>.  Example: "[Section \x1a End]".</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.section-accessor"></a>section_accessor</code></em>;</span></p></td>
<td>Glue to put between the section name and key when
constructing hash table keys.  It is invalid to set
<em class="parameter"><code>section_accessor</code></em> without setting <em class="parameter"><code>section_template</code></em>.
Typically, "::" is used.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.line-prefix"></a>line_prefix</code></em>;</span></p></td>
<td>Mandatory prefix of each line.  Note this applies only to
key-value lines.  The templates, such comments, sections and
terminators, must still include <em class="parameter"><code>line_prefix</code></em> if they start
with it.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.key-value-separator"></a>key_value_separator</code></em>;</span></p></td>
<td>The string separating keys and values on each line.
Typically, "=" or ":" is used.  When left <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>,
whitespace plays the role of the separator.  Of
course, keys cannot contain whitespace then.</td>
</tr>
<tr>
<td><p><span class="term">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GwyTextHeaderParser.terminator"></a>terminator</code></em>;</span></p></td>
<td>Line that marks end of the header.  It is mandatory if
specified, <em class="parameter"><code>GWY_TEXT_HEADER_ERROR_TERMINATOR</code></em> is raised when
the header ends sooner than <em class="parameter"><code>terminator</code></em> is found.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwyTextHeaderParser.item"></a>item</code></em> ()</span></p></td>
<td>Callback called when a key-value pair is found.  If set it is
responsible for inserting the pair to the hash table with
<a href="/usr/share/gtk-doc/html/glib/glib-Hash-Tables.html#g-hash-table-replace"><code class="function">g_hash_table_replace()</code></a>.  It is free to insert a different pair or
nothing.  It must return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if it raises an error.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwyTextHeaderParser.section"></a>section</code></em> ()</span></p></td>
<td>Callback called when a section starts.  It must return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if
it raises an error.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwyTextHeaderParser.endsection"></a>endsection</code></em> ()</span></p></td>
<td>Callback called when a section end.  It must return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if
it raises an error.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwyTextHeaderParser.end"></a>end</code></em> ()</span></p></td>
<td>Callback called when the parsing finishes successfully, <em class="parameter"><code>length</code></em>
contains the length of parsed text in bytes.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GwyTextHeaderParser.error"></a>error</code></em> ()</span></p></td>
<td>Callback called when an error occurs, including errors raised by
other user callbacks.  If it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> the error is considered
fatal and the parsing terminates immediately.  If it is left unset
no errors are fatal hence no errors are reported to the caller.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> <em class="structfield"><code><a name="GwyTextHeaderParser.destroy-key"></a>destroy_key</code></em>;</span></p></td>
<td>Function to destroy keys, passed to <a href="/usr/share/gtk-doc/html/glib/glib-Hash-Tables.html#g-hash-table-new-full"><code class="function">g_hash_table_new_full()</code></a>.
It is invalid to set <em class="parameter"><code>destroy_key</code></em> if <em class="parameter"><code>item</code></em> callback is not
set.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> <em class="structfield"><code><a name="GwyTextHeaderParser.destroy-value"></a>destroy_value</code></em>;</span></p></td>
<td>Function to destroy values, passed to
<a href="/usr/share/gtk-doc/html/glib/glib-Hash-Tables.html#g-hash-table-new-full"><code class="function">g_hash_table_new_full()</code></a>.  It is invalid to set
<em class="parameter"><code>destroy_value</code></em> if <em class="parameter"><code>item</code></em> callback is not set.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-text-header-error-quark"></a><h3>gwy_text_header_error_quark ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>              gwy_text_header_error_quark         (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Returns error domain for expression parsin and evaluation.
</p>
<p>
See and use <a class="link" href="libgwyapp-file-module-utils.html#GWY-TEXT-HEADER-ERROR:CAPS" title="GWY_TEXT_HEADER_ERROR"><code class="literal">GWY_TEXT_HEADER_ERROR</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"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The error domain.</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-text-header-parse"></a><h3>gwy_text_header_parse ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Hash-Tables.html#GHashTable"><span class="returnvalue">GHashTable</span></a> *        gwy_text_header_parse               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *header</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderParser" title="GwyTextHeaderParser"><span class="type">GwyTextHeaderParser</span></a> *parser</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Parses a line-oriented text header into a hash table.
</p>
<p>
See <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderParser" title="GwyTextHeaderParser"><span class="type">GwyTextHeaderParser</span></a> for details of memory and error handling.
</p>
<p>
Lines consisting only of whitespace are ignored.
</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>header</code></em> :</span></p></td>
<td>Text header to parse.  It must be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated and writable.
Its contents will be modified to directly embed the hash keys
and/or values.  It must not be freed while the returned hash
table is in use.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parser</code></em> :</span></p></td>
<td>Parser specification.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed to parser callbacks.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Error to set on fatal errors.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created hash table with values indexed by they keys found
in the header.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-text-header-context-get-section"></a><h3>gwy_text_header_context_get_section ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       gwy_text_header_context_get_section (<em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext"><span class="type">GwyTextHeaderContext</span></a> *context</code></em>);</pre>
<p>
Gets the currently open section.
</p>
<p>
This function may be called if no sectioning is defined.  It simply
returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> 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>context</code></em> :</span></p></td>
<td>Header parsing context.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The name of the currently open section, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if there is none.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-text-header-context-get-lineno"></a><h3>gwy_text_header_context_get_lineno ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               gwy_text_header_context_get_lineno  (<em class="parameter"><code>const <a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext"><span class="type">GwyTextHeaderContext</span></a> *context</code></em>);</pre>
<p>
Gets the current header line.
</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>context</code></em> :</span></p></td>
<td>Header parsing context.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The current line number, starting from zero.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyTextHeaderContext"></a><h3>GwyTextHeaderContext</h3>
<pre class="programlisting">typedef struct _GwyTextHeaderContext GwyTextHeaderContext;</pre>
<p>
<a class="link" href="libgwyapp-file-module-utils.html#GwyTextHeaderContext" title="GwyTextHeaderContext"><span class="type">GwyTextHeaderContext</span></a> represents the parsing state.  It is an opaque data
structure and should be only manipulated with the functions below.
</p>
<p class="since">Since 2.18</p>
</div>
</div>
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