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<title>EXIF library (libexif) API: libexif/exif-loader.h File Reference</title>
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<div id="projectname">EXIF library (libexif) API <span id="projectnumber">0.6.20</span></div>
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<h1>exif-loader.h File Reference</h1> </div>
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<p>Defines the ExifLoader type.
<a href="#_details">More...</a></p>
<div class="textblock"><code>#include <libexif/exif-data.h></code><br/>
<code>#include <libexif/exif-log.h></code><br/>
<code>#include <libexif/exif-mem.h></code><br/>
</div>
<p><a href="exif-loader_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a2b96cbffaf0f92340a960f887026eced"></a><!-- doxytag: member="exif-loader.h::ExifLoader" ref="a2b96cbffaf0f92340a960f887026eced" args="" -->
typedef struct _ExifLoader </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Data used by the loader interface. <br/></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a2d4278edbd89b5af3e5a4fe29b5e085c">exif_loader_new</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a new <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. <a href="#a2d4278edbd89b5af3e5a4fe29b5e085c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a95c8505132b2465c1078b0842285bfc7">exif_loader_new_mem</a> (<a class="el" href="exif-mem_8h.html#aab8aacbc0ed6f11a1f022b7b1bf4750e">ExifMem</a> *mem)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a new <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> using the specified memory allocator. <a href="#a95c8505132b2465c1078b0842285bfc7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#ac5e7a899a7499b56772b671add54fcde">exif_loader_ref</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Increase the refcount of the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. <a href="#ac5e7a899a7499b56772b671add54fcde"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a7f4e3dfa0df969ac8c232327840ca105">exif_loader_unref</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Decrease the refcount of the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. <a href="#a7f4e3dfa0df969ac8c232327840ca105"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a613e86cc4f12d488fbd23fe97a0d30c5">exif_loader_write_file</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader, const char *fname)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Load a file into the given <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> from the filesystem. <a href="#a613e86cc4f12d488fbd23fe97a0d30c5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned char </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#ad1b65ac6288f5f28aa2b4b3d2bf3f56f">exif_loader_write</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader, unsigned char *buf, unsigned int sz)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Load a buffer into the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> from a memory buffer. <a href="#ad1b65ac6288f5f28aa2b4b3d2bf3f56f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a080d8ebb5006c1306a3a798ff60253a5">exif_loader_reset</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free any data previously loaded and reset the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> to its newly-initialized state. <a href="#a080d8ebb5006c1306a3a798ff60253a5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct__ExifData.html">ExifData</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#abe54111cdaf5b0559a20e1e76c31a86c">exif_loader_get_data</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create an <a class="el" href="exif-data_8h.html#ae62aab6698d7c078e38cd445ddcb8abf" title="Represents the entire EXIF data found in an image.">ExifData</a> from the data in the loader. <a href="#abe54111cdaf5b0559a20e1e76c31a86c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#acb140c6f8bce84eb228592dcf202025d">exif_loader_get_buf</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader, const unsigned char **buf, unsigned int *buf_size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the raw data read by the loader. <a href="#acb140c6f8bce84eb228592dcf202025d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="exif-loader_8h.html#a0779beeb15d0c56ae7442f4740f1baf7">exif_loader_log</a> (<a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> *loader, <a class="el" href="exif-log_8h.html#a6b225115984bb2016282923cb487f16b">ExifLog</a> *log)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the log message object used by this <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. <a href="#a0779beeb15d0c56ae7442f4740f1baf7"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Defines the ExifLoader type. </p>
</div><hr/><h2>Function Documentation</h2>
<a class="anchor" id="acb140c6f8bce84eb228592dcf202025d"></a><!-- doxytag: member="exif-loader.h::exif_loader_get_buf" ref="acb140c6f8bce84eb228592dcf202025d" args="(ExifLoader *loader, const unsigned char **buf, unsigned int *buf_size)" -->
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<td class="memname">void exif_loader_get_buf </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
<td class="paramname"><em>loader</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char ** </td>
<td class="paramname"><em>buf</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int * </td>
<td class="paramname"><em>buf_size</em> </td>
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<td>)</td>
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<p>Return the raw data read by the loader. </p>
<p>The returned pointer is only guaranteed to be valid until the next call to a function modifying this <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. Either or both of buf and buf_size may be NULL on entry, in which case that value is not returned.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>the loader </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>read-only pointer to the data read by the loader, or NULL in case of error </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buf_size</td><td>size of the data at buf, or 0 in case of error </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="abe54111cdaf5b0559a20e1e76c31a86c"></a><!-- doxytag: member="exif-loader.h::exif_loader_get_data" ref="abe54111cdaf5b0559a20e1e76c31a86c" args="(ExifLoader *loader)" -->
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<td class="memname"><a class="el" href="struct__ExifData.html">ExifData</a>* exif_loader_get_data </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
<td class="paramname"><em>loader</em></td><td>)</td>
<td></td>
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<div class="memdoc">
<p>Create an <a class="el" href="exif-data_8h.html#ae62aab6698d7c078e38cd445ddcb8abf" title="Represents the entire EXIF data found in an image.">ExifData</a> from the data in the loader. </p>
<p>The loader must already contain data from a previous call to <a class="el" href="exif-loader_8h.html#a613e86cc4f12d488fbd23fe97a0d30c5" title="Load a file into the given ExifLoader from the filesystem.">exif_loader_write_file</a> or <a class="el" href="exif-loader_8h.html#ad1b65ac6288f5f28aa2b4b3d2bf3f56f" title="Load a buffer into the ExifLoader from a memory buffer.">exif_loader_write</a>.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>The <a class="el" href="exif-data_8h.html#ae62aab6698d7c078e38cd445ddcb8abf" title="Represents the entire EXIF data found in an image.">ExifData</a> returned is created using its default options, which may take effect before the data is returned. If other options are desired, an <a class="el" href="exif-data_8h.html#ae62aab6698d7c078e38cd445ddcb8abf" title="Represents the entire EXIF data found in an image.">ExifData</a> must be created explicitly and data extracted from the loader using <a class="el" href="exif-loader_8h.html#acb140c6f8bce84eb228592dcf202025d" title="Return the raw data read by the loader.">exif_loader_get_buf</a> instead.</dd></dl>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>the loader </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>allocated ExifData</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="exif-loader_8h.html#acb140c6f8bce84eb228592dcf202025d" title="Return the raw data read by the loader.">exif_loader_get_buf</a> </dd></dl>
</div>
</div>
<a class="anchor" id="a0779beeb15d0c56ae7442f4740f1baf7"></a><!-- doxytag: member="exif-loader.h::exif_loader_log" ref="a0779beeb15d0c56ae7442f4740f1baf7" args="(ExifLoader *loader, ExifLog *log)" -->
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<td class="memname">void exif_loader_log </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
<td class="paramname"><em>loader</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="exif-log_8h.html#a6b225115984bb2016282923cb487f16b">ExifLog</a> * </td>
<td class="paramname"><em>log</em> </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Set the log message object used by this <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>the loader </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">log</td><td><a class="el" href="exif-log_8h.html#a6b225115984bb2016282923cb487f16b" title="State maintained by the logging interface.">ExifLog</a> </td></tr>
</table>
</dd>
</dl>
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</div>
<a class="anchor" id="a2d4278edbd89b5af3e5a4fe29b5e085c"></a><!-- doxytag: member="exif-loader.h::exif_loader_new" ref="a2d4278edbd89b5af3e5a4fe29b5e085c" args="(void)" -->
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<td class="memname"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a>* exif_loader_new </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
<td></td>
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<div class="memdoc">
<p>Allocate a new <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>allocated ExifLoader </dd></dl>
</div>
</div>
<a class="anchor" id="a95c8505132b2465c1078b0842285bfc7"></a><!-- doxytag: member="exif-loader.h::exif_loader_new_mem" ref="a95c8505132b2465c1078b0842285bfc7" args="(ExifMem *mem)" -->
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<td class="memname"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a>* exif_loader_new_mem </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-mem_8h.html#aab8aacbc0ed6f11a1f022b7b1bf4750e">ExifMem</a> * </td>
<td class="paramname"><em>mem</em></td><td>)</td>
<td></td>
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<p>Allocate a new <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> using the specified memory allocator. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">mem</td><td>the ExifMem </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>allocated ExifLoader </dd></dl>
</div>
</div>
<a class="anchor" id="ac5e7a899a7499b56772b671add54fcde"></a><!-- doxytag: member="exif-loader.h::exif_loader_ref" ref="ac5e7a899a7499b56772b671add54fcde" args="(ExifLoader *loader)" -->
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<td class="memname">void exif_loader_ref </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
<td class="paramname"><em>loader</em></td><td>)</td>
<td></td>
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<div class="memdoc">
<p>Increase the refcount of the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>the ExifLoader to increase the refcount of. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a080d8ebb5006c1306a3a798ff60253a5"></a><!-- doxytag: member="exif-loader.h::exif_loader_reset" ref="a080d8ebb5006c1306a3a798ff60253a5" args="(ExifLoader *loader)" -->
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<td class="memname">void exif_loader_reset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
<td class="paramname"><em>loader</em></td><td>)</td>
<td></td>
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<div class="memdoc">
<p>Free any data previously loaded and reset the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> to its newly-initialized state. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>the loader </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a7f4e3dfa0df969ac8c232327840ca105"></a><!-- doxytag: member="exif-loader.h::exif_loader_unref" ref="a7f4e3dfa0df969ac8c232327840ca105" args="(ExifLoader *loader)" -->
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<td class="memname">void exif_loader_unref </td>
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<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
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<p>Decrease the refcount of the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>. </p>
<p>If the refcount reaches 0, the loader is freed.</p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>ExifLoader for which to decrease the refcount </td></tr>
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<a class="anchor" id="ad1b65ac6288f5f28aa2b4b3d2bf3f56f"></a><!-- doxytag: member="exif-loader.h::exif_loader_write" ref="ad1b65ac6288f5f28aa2b4b3d2bf3f56f" args="(ExifLoader *loader, unsigned char *buf, unsigned int sz)" -->
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<td class="memname">unsigned char exif_loader_write </td>
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<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
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<td class="paramtype">unsigned char * </td>
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<td class="paramtype">unsigned int </td>
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<p>Load a buffer into the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> from a memory buffer. </p>
<p>The relevant data is copied in raw form into the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>loader to write to </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buf</td><td>buffer to read from </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">sz</td><td>size of the buffer </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>1 while EXIF data is read (or while there is still hope that there will be EXIF data later on), 0 otherwise. </dd></dl>
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<a class="anchor" id="a613e86cc4f12d488fbd23fe97a0d30c5"></a><!-- doxytag: member="exif-loader.h::exif_loader_write_file" ref="a613e86cc4f12d488fbd23fe97a0d30c5" args="(ExifLoader *loader, const char *fname)" -->
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<td class="memname">void exif_loader_write_file </td>
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<td class="paramtype"><a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced">ExifLoader</a> * </td>
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<td class="paramtype">const char * </td>
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<p>Load a file into the given <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a> from the filesystem. </p>
<p>The relevant data is copied in raw form into the <a class="el" href="exif-loader_8h.html#a2b96cbffaf0f92340a960f887026eced" title="Data used by the loader interface.">ExifLoader</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loader</td><td>loader to write to </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">fname</td><td>path to the file to read </td></tr>
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</dd>
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