[thirdparty/cups.git] / doc / help / api-mime.html

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<!--
  "$Id: api-array.header 8087 2008-10-27 21:37:05Z mike $"

  MIME API header for CUPS.

  Copyright 2009 by Apple Inc.

  These coded instructions, statements, and computer programs are the
  property of Apple Inc. and are protected by Federal copyright
  law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  which should have been included with this file.  If this file is
  file is missing or damaged, see the license at "http://www.cups.org/".
-->

<h1 class='title'>MIME API</h1>

<div class='summary'><table summary='General Information'>
<thead>
<tr>
	<th>Header</th>
	<th>cups/mime.h</th>
</tr>
</thead>
<tbody>
<tr>
	<th>Library</th>
	<td>-lcupsmime</td>
</tr>
<tr>
	<th>See Also</th>
	<td>Programming: <a href='api-overview.html' target='_top'>Introduction to CUPS Programming</a></td>
</tr>
</tbody>
</table></div>
<h2 class="title">Contents</h2>
<ul class="contents">
<ul class="subcontents">
<li><a href="#OVERVIEW">Overview</a></li>
<li><a href="#FUNCTIONS">Functions</a><ul class="code">
<li><a href="#mimeAddFilter" title="Add a filter to the current MIME database.">mimeAddFilter</a></li>
<li><a href="#mimeAddType" title="Add a MIME type to a database.">mimeAddType</a></li>
<li><a href="#mimeAddTypeRule" title="Add a detection rule for a file type.">mimeAddTypeRule</a></li>
<li><a href="#mimeDelete" title="Delete (free) a MIME database.">mimeDelete</a></li>
<li><a href="#mimeDeleteFilter" title="Delete a filter from the MIME database.">mimeDeleteFilter</a></li>
<li><a href="#mimeDeleteType" title="Delete a type from the MIME database.">mimeDeleteType</a></li>
<li><a href="#mimeFileType" title="Determine the type of a file.">mimeFileType</a></li>
<li><a href="#mimeFilter" title="Find the fastest way to convert from one type to another.">mimeFilter</a></li>
<li><a href="#mimeFilterLookup" title="Lookup a filter...">mimeFilterLookup</a></li>
<li><a href="#mimeFirstFilter" title="Get the first filter in the MIME database.">mimeFirstFilter</a></li>
<li><a href="#mimeFirstType" title="Get the first type in the MIME database.">mimeFirstType</a></li>
<li><a href="#mimeLoad" title="Create a new MIME database from disk.">mimeLoad</a></li>
<li><a href="#mimeLoadFilters" title="Load filter definitions from disk.">mimeLoadFilters</a></li>
<li><a href="#mimeLoadTypes" title="Load type definitions from disk.">mimeLoadTypes</a></li>
<li><a href="#mimeNextFilter" title="Get the next filter in the MIME database.">mimeNextFilter</a></li>
<li><a href="#mimeNextType" title="Get the next type in the MIME database.">mimeNextType</a></li>
<li><a href="#mimeNumFilters" title="MIME database">mimeNumFilters</a></li>
<li><a href="#mimeNumTypes" title="MIME database">mimeNumTypes</a></li>
<li><a href="#mimeType" title="Lookup a file type.">mimeType</a></li>
</ul></li>
<li><a href="#TYPES">Data Types</a><ul class="code">
	<li><a href="#mime_filter_t" title="MIME Conversion Filter Data">mime_filter_t</a></li>
	<li><a href="#mime_magic_t" title="MIME Magic Data">mime_magic_t</a></li>
	<li><a href="#mime_op_t" title="Types/structures...">mime_op_t</a></li>
	<li><a href="#mime_t" title="MIME Database">mime_t</a></li>
	<li><a href="#mime_type_t" title="MIME Type Data">mime_type_t</a></li>
</ul></li>
<!--
  "$Id: api-array.shtml 7616 2008-05-28 00:34:13Z mike $"

  MIME API introduction for CUPS.

  Copyright 2009 by Apple Inc.

  These coded instructions, statements, and computer programs are the
  property of Apple Inc. and are protected by Federal copyright
  law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  which should have been included with this file.  If this file is
  file is missing or damaged, see the license at "http://www.cups.org/".
-->

<h2 class='title'><a name='OVERVIEW'>Overview</a></h2>

<p>The MIME API provides file typing and conversion services for CUPS.</p>
<h2 class="title"><a name="FUNCTIONS">Functions</a></h2>
<h3 class="function"><a name="mimeAddFilter">mimeAddFilter</a></h3>
<p class="description">Add a filter to the current MIME database.</p>
<p class="code">
<a href="#mime_filter_t">mime_filter_t</a> *mimeAddFilter (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *src,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *dst,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cost,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *filter<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>src</dt>
<dd class="description">Source type</dd>
<dt>dst</dt>
<dd class="description">Destination type</dd>
<dt>cost</dt>
<dd class="description">Relative time/resource cost</dd>
<dt>filter</dt>
<dd class="description">Filter program to run</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New filter</p>
<h3 class="function"><a name="mimeAddType">mimeAddType</a></h3>
<p class="description">Add a MIME type to a database.</p>
<p class="code">
<a href="#mime_type_t">mime_type_t</a> *mimeAddType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *super,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *type<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>super</dt>
<dd class="description">Super-type name</dd>
<dt>type</dt>
<dd class="description">Type name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New (or existing) MIME type</p>
<h3 class="function"><a name="mimeAddTypeRule">mimeAddTypeRule</a></h3>
<p class="description">Add a detection rule for a file type.</p>
<p class="code">
int mimeAddTypeRule (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *mt,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *rule<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mt</dt>
<dd class="description">Type to add to</dd>
<dt>rule</dt>
<dd class="description">Rule to add</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">0 on success, -1 on failure</p>
<h3 class="function"><a name="mimeDelete">mimeDelete</a></h3>
<p class="description">Delete (free) a MIME database.</p>
<p class="code">
void mimeDelete (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h3 class="function"><a name="mimeDeleteFilter">mimeDeleteFilter</a></h3>
<p class="description">Delete a filter from the MIME database.</p>
<p class="code">
void mimeDeleteFilter (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_filter_t">mime_filter_t</a> *filter<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>filter</dt>
<dd class="description">Filter</dd>
</dl>
<h3 class="function"><a name="mimeDeleteType">mimeDeleteType</a></h3>
<p class="description">Delete a type from the MIME database.</p>
<p class="code">
void mimeDeleteType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *mt<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>mt</dt>
<dd class="description">Type</dd>
</dl>
<h3 class="function"><a name="mimeFileType">mimeFileType</a></h3>
<p class="description">Determine the type of a file.</p>
<p class="code">
<a href="#mime_type_t">mime_type_t</a> *mimeFileType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *pathname,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *filename,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int *compression<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>pathname</dt>
<dd class="description">Name of file to check on disk</dd>
<dt>filename</dt>
<dd class="description">Original filename or NULL</dd>
<dt>compression</dt>
<dd class="description">Is the file compressed?</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Type of file</p>
<h3 class="function"><a name="mimeFilter">mimeFilter</a></h3>
<p class="description">Find the fastest way to convert from one type to another.</p>
<p class="code">
cups_array_t *mimeFilter (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *src,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *dst,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int *cost<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>src</dt>
<dd class="description">Source file type</dd>
<dt>dst</dt>
<dd class="description">Destination file type</dd>
<dt>cost</dt>
<dd class="description">Cost of filters</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Array of filters to run</p>
<h3 class="function"><a name="mimeFilterLookup">mimeFilterLookup</a></h3>
<p class="description">Lookup a filter...</p>
<p class="code">
<a href="#mime_filter_t">mime_filter_t</a> *mimeFilterLookup (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *src,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_type_t">mime_type_t</a> *dst<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>src</dt>
<dd class="description">Source type</dd>
<dt>dst</dt>
<dd class="description">Destination type</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Filter for src-&gt;dst</p>
<h3 class="function"><a name="mimeFirstFilter">mimeFirstFilter</a></h3>
<p class="description">Get the first filter in the MIME database.</p>
<p class="code">
<a href="#mime_filter_t">mime_filter_t</a> *mimeFirstFilter (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Filter or NULL</p>
<h3 class="function"><a name="mimeFirstType">mimeFirstType</a></h3>
<p class="description">Get the first type in the MIME database.</p>
<p class="code">
<a href="#mime_type_t">mime_type_t</a> *mimeFirstType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Type or NULL</p>
<h3 class="function"><a name="mimeLoad">mimeLoad</a></h3>
<p class="description">Create a new MIME database from disk.</p>
<p class="code">
<a href="#mime_t">mime_t</a> *mimeLoad (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *pathname,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *filterpath<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>pathname</dt>
<dd class="description">Directory to load</dd>
<dt>filterpath</dt>
<dd class="description">Directory to load</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New MIME database</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function uses <a href="#mimeLoadFilters"><code>mimeLoadFilters</code></a> and <a href="#mimeLoadTypes"><code>mimeLoadTypes</code></a> to
create a MIME database from a single directory.</p>
<h3 class="function"><a name="mimeLoadFilters">mimeLoadFilters</a></h3>
<p class="description">Load filter definitions from disk.</p>
<p class="code">
<a href="#mime_t">mime_t</a> *mimeLoadFilters (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *pathname,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *filterpath<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>pathname</dt>
<dd class="description">Directory to load from</dd>
<dt>filterpath</dt>
<dd class="description">Default filter program directory</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">MIME database</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function loads all of the .convs files from the specified directory.
Use <a href="#mimeLoadTypes"><code>mimeLoadTypes</code></a> to load all types before you load the filters.</p>
<h3 class="function"><a name="mimeLoadTypes">mimeLoadTypes</a></h3>
<p class="description">Load type definitions from disk.</p>
<p class="code">
<a href="#mime_t">mime_t</a> *mimeLoadTypes (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *pathname<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database or <code>NULL</code> to create a new one</dd>
<dt>pathname</dt>
<dd class="description">Directory to load from</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">MIME database</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function loads all of the .types files from the specified directory.
Use <a href="#mimeLoadFilters"><code>mimeLoadFilters</code></a> to load all filters after you load the types.</p>
<h3 class="function"><a name="mimeNextFilter">mimeNextFilter</a></h3>
<p class="description">Get the next filter in the MIME database.</p>
<p class="code">
<a href="#mime_filter_t">mime_filter_t</a> *mimeNextFilter (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Filter or NULL</p>
<h3 class="function"><a name="mimeNextType">mimeNextType</a></h3>
<p class="description">Get the next type in the MIME database.</p>
<p class="code">
<a href="#mime_type_t">mime_type_t</a> *mimeNextType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Type or NULL</p>
<h3 class="function"><a name="mimeNumFilters">mimeNumFilters</a></h3>
<p class="description">MIME database</p>
<p class="code">
int mimeNumFilters (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Get the number of filters in a MIME database.</p>
<h3 class="function"><a name="mimeNumTypes">mimeNumTypes</a></h3>
<p class="description">MIME database</p>
<p class="code">
int mimeNumTypes (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Get the number of types in a MIME database.</p>
<h3 class="function"><a name="mimeType">mimeType</a></h3>
<p class="description">Lookup a file type.</p>
<p class="code">
<a href="#mime_type_t">mime_type_t</a> *mimeType (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#mime_t">mime_t</a> *mime,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *super,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *type<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>mime</dt>
<dd class="description">MIME database</dd>
<dt>super</dt>
<dd class="description">Super-type name</dd>
<dt>type</dt>
<dd class="description">Type name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Matching file type definition</p>
<h2 class="title"><a name="TYPES">Data Types</a></h2>
<h3 class="typedef"><a name="mime_filter_t">mime_filter_t</a></h3>
<p class="description">MIME Conversion Filter Data</p>
<p class="code">
typedef struct _mime_filter_s mime_filter_t;
</p>
<h3 class="typedef"><a name="mime_magic_t">mime_magic_t</a></h3>
<p class="description">MIME Magic Data</p>
<p class="code">
typedef struct _mime_magic_s mime_magic_t;
</p>
<h3 class="typedef"><a name="mime_op_t">mime_op_t</a></h3>
<p class="description">Types/structures...</p>
<p class="code">
typedef enum mime_op_t;
</p>
<h3 class="typedef"><a name="mime_t">mime_t</a></h3>
<p class="description">MIME Database</p>
<p class="code">
typedef struct _mime_s mime_t;
</p>
<h3 class="typedef"><a name="mime_type_t">mime_type_t</a></h3>
<p class="description">MIME Type Data</p>
<p class="code">
typedef struct _mime_type_s mime_type_t;
</p>
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