/usr/share/cups/mime/cupsfilters.types is in cups-filters 1.0.18-0ubuntu0.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# "$Id: $"
#
# MIME types file for OpenPrinting CUPS Filters.
#
# DO NOT EDIT THIS FILE, AS IT IS OVERWRITTEN WHEN YOU INSTALL NEW
# VERSIONS OF OPENPRINTING CUPS FILTERS. Instead, create a "local.types"
# file that reflects your local configuration changes.
#
# Copyright 2011 by Till Kamppeter
#
#
# Distribution and use rights are outlined in the file "LICENSE.txt"
# which should have been included with this file.
#
########################################################################
#
# Format of Lines:
#
# super/type rules
#
# "rules" can be any combination of:
#
# ( expr ) Parenthesis for expression grouping
# + Logical AND
# , or whitespace Logical OR
# ! Logical NOT
# match("pattern") Pattern match on filename
# extension Pattern match on "*.extension"
# ascii(offset,length) True if bytes are valid printable ASCII
# (CR, NL, TAB, BS, 32-126)
# priority(number) Sets priority of type (0=lowest,
# 100=default, 200=highest)
# printable(offset,length) True if bytes are printable 8-bit chars
# (CR, NL, TAB, BS, 32-126, 128-254)
# string(offset,"string") True if bytes are identical to string
# istring(offset,"string") True if bytes are identical to
# case-insensitive string
# char(offset,value) True if byte is identical
# short(offset,value) True if 16-bit integer is identical
# int(offset,value) True if 32-bit integer is identical
# locale("string") True if current locale matches string
# contains(offset,range,"string") True if the range contains the string
#
# General Notes:
#
# MIME type names are case-insensitive. Internally they are converted
# to lowercase. Multiple occurrences of a type will cause the provided
# rules to be appended to the existing definition. If two types use the same
# rules to resolve a type and have the same priority, e.g. "doc" extension for
# "text/bar" and "text/foo", the returned type will be the first type as
# sorted in alphanumerically ascending order without regard to case. Thus,
# the "text/bar" type will match the "doc" extension first unless the
# "text/foo" type has specified a higher priority.
#
# The "printable" rule differs from the "ascii" rule in that it also
# accepts 8-bit characters in the range 128-255.
#
# String constants must be surrounded by "" if they contain whitespace.
# To insert binary data into a string, use the <hex> notation.
#
########################################################################
#
# Application-generated files...
#
# CUPS file detection rule for PostScript which is generated by the Adobe
# Reader. We distinguish PostScript from the Adobe reader here so that we
# can override pstopdf and the PDF workflow for these PostScript files as the
# conversion of them to PDF does not work if the original PDF file was
# encrypted.
application/vnd.adobe-reader-postscript priority(150) contains(0,4096,"%%Creator: Adobe Acrobat") + \
(ai eps ps string(0,%!) string(0,<04>%!) \
contains(0,128,<1B>%-12345X) + \
(contains(0,4096,"LANGUAGE=POSTSCRIPT") \
contains(0,4096,"LANGUAGE = Postscript") \
contains(0,4096,"LANGUAGE = PostScript") \
contains(0,4096,"LANGUAGE = POSTSCRIPT") \
(contains(0,4096,<0a>%!) + \
!contains(0,4096,"ENTER LANGUAGE"))))
########################################################################
#
# Image files...
#
image/x-xbitmap xbm string(0,"#define");
image/x-xpixmap xpm string(3,"XPM")
image/x-xwindowdump xwd string(4,<00000007>)
########################################################################
#
# CUPS-specific types...
#
application/vnd.cups-pdf
application/vnd.cups-pdf-banner string(0,'#PDF-BANNER')
#
# End of "$Id: $".
#
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