gs_cidfn.ps

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%    Copyright (C) 1995 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of Aladdin Ghostscript.
% 
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
% 
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC.  The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License.  Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.

% ProcSet for implementing CID-keyed fonts.
% When this is run, systemdict is still writable.

%**************** This file is not ready for use:
%	- It doesn't include the actual character mapper (BuildGlyph).
%	- It loads the entire font into RAM.
%	- It has never been tested on a real font.

/.setlanguagelevel where { pop 2 .setlanguagelevel } if
.currentglobal true .setglobal

/GS_CIDInit_ProcSet 30 dict dup begin

% ---------------- CIDFont operators ---------------- %

/StartData		% <cidfontdict> <(Binary)|(Hex)> <datalength>
			%   StartData -
 { 2 index begin	% CID font dict
   20 dict begin	% temporary dict
   /datalength exch def
   (Hex) eq /hex exch def
   /cidfont exch def
   /startdata currentfile fileposition def
   
	% Read the character data into an array of strings.
	% There's no particular reason to prefer long strings over short,
	% so we just create a separate string for each character.

   /charstrings CIDCount array def
   /fontindices CIDCount FDBytes 1 eq { string } { array } ifelse def
   0 1 CIDCount 1 sub
    { /cid exch def
      currentfile FDBytes GDBytes add cid mul startdata add setfileposition
      fontindices cid FDBytes .readint put
      charstrings cid
      /pos GDBytes .readint def
      FDBytes .readint pop	% skip FD of next entry
      GDBytes .readint pos sub
      dup 0 eq
       { pop null }
       { currentfile pos setfileposition string readstring pop }
      ifelse put
    }
   for

	% Process each font in the FDArray.
	% For Type 3 fonts, just do a definefont with an empty Encoding.
	% For Type 1 fonts, read the Subrs (don't bother to check for
	% duplicates), and set CharStrings to the character data array.
	% We don't support embedded Type 0 fonts, but it isn't clear
	% whether they're allowed anyway.

   cidfont /FDepVector [ FDArray
    { dup /FontType get 1 eq
       { dup /CharStrings charstrings put
	 /Private get
	 dup /SubrCount known
	  { begin /Subrs [	% Private
	    0 1 SubrCount 1 sub
	     { SDBytes mul SubrMapOffset add startdata add
	       currentfile exch setfileposition
	       /pos SDBytes .readint def
	       SDBytes .readint pos sub
	       currentfile pos setfileposition string readstring pop
	     }
	    ] readonly def end	% Private
	  }
	 if pop
       }
      if
      dup /Encoding [] put
      dup /FontName get exch definefont
    }
   forall ] readonly def

	% Install the rest of the data in the font.

   cidfont /CharStrings charstrings readonly put
   cidfont /FontIndices fontindices readonly put
   FontName cidfont /CIDFont defineresource pop

	% Wrap up.

   end			% temporary dict
   end			% CID font dict
   end			% resource dict
 } bind def

/.readint		% <nbytes> .readint <int>
 { 0 exch { 8 bitshift currentfile read pop add } repeat
 } bind def

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

end readonly def

/defineresource where
 { pop
   /CIDFont /Generic /Category findresource dup length dict .copydict
   /Category defineresource pop
   /CIDInit GS_CIDInit_ProcSet /ProcSet defineresource pop
 }
if

.setglobal