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<h1 class="title">mime.types(5)</h1>
<h2 class="title"><a name="NAME">Name</a></h2>
mime.types - mime type description file for cups
<h2 class="title"><a name="DESCRIPTION">Description</a></h2>
The <b>mime.types</b> file defines the recognized file types.
<p>Additional file types are specified in files with the extension <i>.types</i> in the CUPS configuration directory.
<p>Each line in the <b>mime.types</b> file is a comment, blank, or rule line.
Comment lines start with the # character.
Rule lines start with the MIME media type and are optionally followed by a series of file recognition rules:
<pre class="man">
<i>mime/type </i>[ <i>rule </i>... <i>rule </i>]
</pre>
Rules can be extended over multiple lines using the backslash character (\):
<pre class="man">
<i>mime/type </i>[ <i>really-really-really-long-rule </i>... <b>\
</b><i>rule </i>]
</pre>
MIME media types specified by the <i>mime/type</i> field are case-insensitive and are sorted in ascending alphanumeric order for the purposes of matching.
See the "TYPE MATCHING AND PRIORITY" section for more information.
<p>The rules may be grouped using parenthesis, joined using "+" for a logical AND, joined using "," or whitespace for a logical OR, and negated using "!".
<h3><a name="RULES">Rules</a></h3>
Rules take two forms - a filename extension by itself and functions with test
values inside parenthesis.
The following functions are available:
<dl class="man">
<dt><b>match("</b><i>pattern</i><b>")</b>
<dd style="margin-left: 5.0em">True if the filename matches the given shell wildcard <i>pattern</i>.
<dt><b>ascii(</b><i>offset</i><b>,</b><i>length</i><b>)</b>
<dd style="margin-left: 5.0em">True if the <i>length</i> bytes starting at <i>offset</i> are valid printable ASCII (CR, NL, TAB, BS, 32-126).
<dt><b>printable(</b><i>offset</i><b>,</b><i>length</i><b>)</b>
<dd style="margin-left: 5.0em">True if the <i>length</i> bytes starting at <i>offset</i> are printable 8-bit chars (CR, NL, TAB, BS, 32-126, 128-254).
<dt><b>priority(</b><i>number</i><b>)</b>
<dd style="margin-left: 5.0em">Specifies the relative priority of this MIME media type.
The default priority is 100.
Larger values have higher priority while smaller values have lower priority.
<dt><b>string(</b><i>offset</i><b>,"</b><i>string</i><b>")</b>
<dd style="margin-left: 5.0em">True if the bytes starting at <i>offset</i> are identical to <i>string</i>.
<dt><b>istring(</b><i>offset</i><b>,"</b><i>string</i><b>")</b>
<dd style="margin-left: 5.0em">True if the bytes starting at <i>offset</i> match <i>string</i> without respect to case.
<dt><b>char(</b><i>offset</i><b>,</b><i>value</i><b>)</b>
<dd style="margin-left: 5.0em">True if the byte at <i>offset</i> is identical to <i>value</i>.
<dt><b>short(</b><i>offset</i><b>,</b><i>value</i><b>)</b>
<dd style="margin-left: 5.0em">True if the 16-bit big-endian integer at <i>offset</i> is identical to <i>value</i>.
<dt><b>int(</b><i>offset</i><b>,</b><i>value</i><b>)</b>
<dd style="margin-left: 5.0em">True if the 32-bit big-endian integer at <i>offset</i> is identical to <i>value</i>.
<dt><b>locale("</b><i>string</i><b>")</b>
<dd style="margin-left: 5.0em">True if current locale matches <i>string</i>.
<dt><b>contains(</b><i>offset</i><b>,</b><i>range</i><b>,"</b><i>string</i><b>")</b>
<dd style="margin-left: 5.0em">True if the bytes starting at <i>offset</i> for <i>range</i> bytes contains <i>string</i>.
</dl>
<h3><a name="STRING_CONSTANTS">String Constants</a></h3>
String constants can be specified inside quotes ("") for strings containing whitespace and angle brackets (<>) for hexadecimal strings.
<h3><a name="TYPE_MATCHING_AND_PRIORITY">Type Matching And Priority</a></h3>
When CUPS needs to determine the MIME media type of a given file, it checks every MIME media type defined in the <i>.types</i> files.
When two or more types match a given file, the type chosen will depend on the type name and priority, with higher-priority types being used over lower-priority ones.
If the types have the same priority, the type names are sorted alphanumerically in ascending order and the first type is chosen.
<p>For example, if two types "text/bar" and "text/foo" are defined as matching the
extension "doc", normally the type "text/bar" will be chosen since its name is
alphanumerically smaller than "text/foo".
However, if "text/foo" also defines a higher priority than "text/bar", "text/foo" will be chosen instead.
<h2 class="title"><a name="FILES">Files</a></h2>
<i>/etc/cups</i> - Typical CUPS configuration directory.
<h2 class="title"><a name="EXAMPLES">Examples</a></h2>
Define two MIME media types for raster data, with one being a subset with higher priority:
<pre class="man">
application/vnd.cups-raster string(0,"RaSt") string(0,"tSaR") \
string(0,"RaS2") string(0,"2SaR") \
string(0,"RaS3") string(0,"3SaR")
image/pwg-raster string(0,"RaS2") + \
string(4,PwgRaster<00>) priority(150)
</pre>
<h2 class="title"><a name="SEE_ALSO">See Also</a></h2>
<a href="man-cups-files.conf.html?TOPIC=Man+Pages"><b>cups-files.conf</b>(5),</a>
<a href="man-cupsd.conf.html?TOPIC=Man+Pages"><b>cupsd.conf</b>(5),</a>
<a href="man-cupsd.html?TOPIC=Man+Pages"><b>cupsd</b>(8),</a>
<a href="man-cupsfilter.html?TOPIC=Man+Pages"><b>cupsfilter</b>(8),</a>
<a href="man-mime.convs.html?TOPIC=Man+Pages"><b>mime.convs</b>(5),</a>
CUPS Online Help (<a href="http://localhost:631/help">http://localhost:631/help</a>)
<h2 class="title"><a name="COPYRIGHT">Copyright</a></h2>
Copyright © 2021-2023 by OpenPrinting.
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