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/usr/share/cups/mime/pstotiff.types is in hplip 3.14.6-1+deb8u1.

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The actual contents of the file can be viewed below.

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#   Copyright 2010-2011 by HP.
#
########################################################################
#
# 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)
#   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.  Type names are sorted
#   in ascending order, so if two types use the same rules to resolve a type
#   (e.g. doc extension for two types), the returned type will be the first
#   type in the sorted list.
#
#   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...
#

#application/vnd.hplip-tiff	tiff tif string(0,MM<002A>) string(0,II<2A00>)
image/tiff			tiff tif string(0,MM<002A>) string(0,II<2A00>)