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[EDIT] FILE: gs_cff.ps

% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% Loader for CFF (compressed) fonts, including OpenType CFFs.
% The following are not implemented yet:
%	Deleted entries in the Name Index
%	Embedded PostScript
%	Multiple Master fonts
%	Chameleon fonts
%	Synthetic fonts

% ---------------- Font loading machinery ---------------- %

% Augment the FONTPATH machinery so it recognizes OpenType CFF font sets.

/.scanfontheaders where {
  pop /.scanfontheaders [
   .scanfontheaders aload pop (OTTO*)
  ] def
} if

% Load a font file that might be an OpenType CFF font set.

% <file> .init_otto_font_file <file>
/.init_otto_font_file {
  /FontSetInit /ProcSet findresource begin
  2 dict begin
  /f exch def /cff //null def
  card32 pop card16 6 { next pop } repeat dup {
                % Stack: numtables tablesleft
    dup 0 eq {
      pop pop /.loadottofontfile cvx /invalidfont signalerror
    } if
    f 4 string readstring pop (CFF ) eq { sub exit } if
    f 12 string readstring pop pop 1 sub	% skip to next table
  } loop
                % Stack: tablesread
  card32 pop card32 card32
                % Stack: tablesread start length
  exch 3 -1 roll 1 add 16 mul 12 add sub
  f exch subfilefilter flushfile	% skip to start
  f exch subfilefilter end
} .bind executeonly odef

% <file> .init_otto_font_file <file>
/.init_wOFF_otto_font_file {
  /FontSetInit /ProcSet findresource begin
  2 dict begin
  /f exch def /cff //null def
  3 {card32 pop} repeat % (wOFF), (OTTO) and file length

card16
  30 { next pop } repeat
  dup
  {
                % Stack: numtables tablesleft
    dup 0 eq {
      pop pop /.loadottofontfile cvx /invalidfont signalerror
    } if
    f 4 string readstring pop (CFF ) eq { sub exit } if
    f 12 string readstring pop pop 1 sub	% skip to next table
  } loop
                % Stack: tablesread
  4 { card32 } repeat
                % Stack: tablesread start complen len checksum
  pop
                % Stack: tablesread start complen len
  4 -2 roll exch
                % Stack: complen len start tablesread
  1 add 20 mul 44 add sub
                % Stack: complen len offset
  f exch subfilefilter flushfile	% skip to start
                % Stack: complen len
  % the table can legally be uncompressed: complen == len
  1 index 1 index eq
  { exch pop f exch subfilefilter}
  { pop f exch subfilefilter /FlateDecode filter} ifelse
  end
} bind def

% <file> .loadfontfile -
/.loadnonottofontfile /.loadfontfile load def
/.loadfontfile {
  dup (12345678) .peekstring pop (wOFFOTTO) eq
  {
    //.init_wOFF_otto_font_file exec
    //true //false
  }{//true} ifelse

{
    dup 4 string .peekstring pop (OTTO) eq
    {
                  % If this is a font at all, it's an OpenType CFF font set.
      .init_otto_font_file //true
    }
    { //false } ifelse
  } if

{      % Use a random FontSet resource name.  ****** WRONG ******
    realtime rand xor =string cvs exch //false //false
    ReadData pop
  } {
                % Not a TrueType font.
    .loadnonottofontfile
  } ifelse
} bind executeonly def

currentdict /.init_wOFF_otto_font_file .forceundef

20 dict begin
% ------ Utilities ------ %

/subfilefilter {	% <file> <length> subfilefilter <filter>
        % SubFileDecode interprets a length of 0 as infinite.
  dup 0 le { pop pop () 0 } if () /SubFileDecode filter
} bind def

/advance {	% <n> advance -
  f cff eq { pos add /pos exch store } { pop } ifelse
} bind def
/next {		% - next <byte>
  f read {
    1 advance
    CFFDEBUG { (  ) print dup = } if
  } {
    0
    CFFDEBUG { (  Out of range access, assuming 0) = } if
    /pdfformaterror where {
      pop
      (   **** Warning: Out of range access to a CFF table, assuming 0.\n)
      pdfformaterror
    } if
  } ifelse
} bind def
/next2 {	% - next2 <byte1> <byte2>
  f read {
    f read {
      2 advance
      CFFDEBUG { (  ) print 1 index =only (,) print dup = } if
    } {
      1 advance
      CFFDEBUG { (  ) print dup = } if
    } ifelse
  } if
} bind def
/nextstring {	% <length> nextstring <string>
  dup 0 eq {
    pop ()
  } {
    string f exch readstring pop dup length advance
    CFFDEBUG { (  ) print dup //== exec } if
  } ifelse
} bind def

/card8		% - card8 <card8>
 /next load
def
/card16 {	% - card16 <card16>
  next2 exch 8 bitshift add
} bind def
/card32 {	% - card32 <card32>
  card16 16 bitshift card16 add
} bind def
/offsetprocs [
  /card8 load
  /card16 load
  { card8 16 bitshift card16 add } bind
  /card32 load
] readonly def
/offsetproc {	% <offsize> offsetproc <proc>
  1 sub //offsetprocs exch get
} bind def
/offset {	% <offsize> offset <offset>
  offsetproc exec
} bind def
/sid		% - <sid> sid
  /card16 load
def

% ------ Main program ------ %

% We need to pass the file as a parameter for the sake of the PDF
% interpreter. Also for the sake of PDF, a flag forces the font
% to be defined as <resname> instead of the name embedded in the data.
% This is needed for subsetted fonts; it is valid if the CFF
% contains only a single font.
% Finally, PDF interpreter may request creation of CIDFont out of an
% ordinary CFF font.
/StartData {          % <resname> <nbytes> StartData -
  currentfile exch subfilefilter //false //false ReadData pop
} bind executeonly def
/ReadData {           % <resname> <file> <forceresname> <forcecid> ReadData <fontset>
        % Initialize.

30 dict begin
  /forcecidfont exch def
  /forceresname exch def
  /cff exch def
  /pos 0 def
  /resname exch cvlit def
  /DEBUG CFFDEBUG def	% bring the binding closer
  /StringCache 1 dict def % Private DICT may be reused.

forcecidfont
  [ { cff 1024 string readstring not { exit } if } loop ]
  .parsecff /fonts exch def

resname
  mark fonts {
    forceresname { exch pop resname exch } if
    dup /CIDFontType known { % This is a CIDFont.
      dup /CIDFontName 3 index put
      1 index exch /CIDFont defineresource
    } {      	             % This is a font.
      dup /FontName 3 index put
      dup /FontType 2 put
      1 index exch
      definefont
    } ifelse
  } forall .dicttomark

end		% temporary dict
  end		% FontSetInit ProcSet
  /FontSet defineresource

} bind executeonly def

% ---------------- Resource category definition ---------------- %

currentdict end readonly

languagelevel exch 2 .setlanguagelevel

/FontSet /Generic /Category findresource dup length dict .copydict
/Category defineresource pop

/FontSetInit exch /ProcSet defineresource pop

.setlanguagelevel

CANCEL