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Filename : gs_cidfn.ps
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% Copyright (C) 2001-2022 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.
%

% ProcSet for implementing CIDFont and CIDMap resources.
% When this is run, systemdict is still writable.

% ---------------- Defining CIDFont resources ---------------- %

% Define a CIDFont resource.  This is the defineresource implementation for
% the CIDFont resource category.

/.checkfonttype {	% <cidfont> <fonttype> .checkfonttype <cidfont> <new?>
  1 index /FID known {
    1 index /FontType get ne {
      /definefont cvx /invalidfont signalerror
    } if //false
  } {
    1 index /FontType 3 -1 roll put //true
  } ifelse
} bind def

/.cidfonttypes where { pop } { /.cidfonttypes 6 dict def } ifelse
.cidfonttypes

30 dict begin

/.gcompatstringcopy % <string> <global> .gcompatstringcopy <string>
{
   dup 2 index gcheck eq
   { pop }
   {
       currentglobal 3 1 roll setglobal
       dup length string copy
       exch setglobal
   } ifelse
} bind def

% The key in .cidfonttypes is the CIDFontType value;
% the value is a procedure that takes a font name and the CIDFont dictionary
% and replaces the latter with a real font.

% ------ CIDFontType 0 (FontType 9) ------ %

% We add the following entries to the CIDFont dictionary, in addition to
% the ones documented by Adobe:
%	SubrCache - dictionary for caching Subr arrays
% For CIDFonts where we read the data from disk incrementally:
%	GlyphData is 0 (arbitrary)
%	DataSource - a ReusableStreamDecode filter for the data
% We also add a FID entry, and possibly a Subrs entry, to each element of
% FDArray.

dup 0 {
  9 //.checkfonttype exec {
    /CIDInit /ProcSet findresource begin
    .completefont9
    end
  } if
  1 index exch .buildfont9
  .currentresourcefile dup type /filetype eq { //.filename {1 index gcheck //.gcompatstringcopy exec 1 index exch /ResourcePath exch put} if }{ pop} ifelse
  exch pop
} put % Don't bind it here, because gs_fapi.ps redefines .buildfont9

% Add entries to a new CIDFontType 0 font per documentation (FontMatrix)
% or for .buildfont9 (FDArray.Private.Subrs).
/.completefont9 {	% <cidfont0> .completefont9 <cidfont0>
  currentglobal 3 1 roll dup gcheck setglobal
  dup /FontMatrix known {
    dup /FDArray get {
      dup /FontMatrix get 0 get 1000000 ge {
        /FontMatrix matrix put  % Bug 688517
      } {
        pop
      } ifelse
    } forall
  } {
    dup /FontMatrix [0.001 0 0 0.001 0 0] put
    dup /FDArray get {
       currentglobal exch dup gcheck setglobal
       dup /FontMatrix get {1000 0 0 1000 0 0} matrix concatmatrix
       /FontMatrix exch put
       setglobal
    } forall
  } ifelse
  dup /FDArray get {
                % Read the Subrs if necessary.
    dup /Private get dup /Subrs known not {
      dup /SubrCount .knownget {
                % Stack: font Private SubrCount
        currentglobal 3 1 roll 1 index gcheck setglobal
        array 1 index /Subrs 3 -1 roll put
                % Stack: font global Private
        2 index begin begin .loadsubrs end end
        setglobal
      } {
        pop
      } ifelse readonly pop
    } {
      pop pop
    } ifelse
  } forall
  3 -1 roll setglobal
} bind def

% Read some Subrs for the current Type 1 subfont.
% The subfont's Private dict is currentdict; the CIDFont itself is the
% next dictionary on the stack.
/.readsubrs {		% <Subrs> <start> .readsubrs <Subrs>
  1 SubrCount 1 sub {
    dup SDBytes mul SubrMapOffset add
    dup SDBytes .readint exch SDBytes add SDBytes .readint
    1 index sub string ReadString 2 index 3 1 roll put
  } for
} bind def

% Ensure that all the Subrs for the current Type 1 subfont are loaded.
% The subfont's Private dict is currentdict; the CIDFont itself is the
% next dictionary on the stack.
/.loadsubrs {
  Subrs length 0 ne {
    SubrCache SubrMapOffset .knownget {
                % We've already loaded some Subrs at this offset.
                % Make sure we've got as many as we need.
      dup length SubrCount lt {
                % We need to load more.
        SubrCount array exch 1 index copy length .readsubrs
        SubrCache SubrMapOffset 2 index put
      } if
    } {
                % We haven't loaded any Subrs at this offset yet.
      SubrCount array 0 .readsubrs
      SubrCache SubrMapOffset 2 index put
    } ifelse
    Subrs copy pop
  } if
} bind def

% ------ CIDFontType 1 (FontType 10) ------ %


dup 1 {
  10 //.checkfonttype exec pop
  1 index exch .buildfont10
  .currentresourcefile dup type /filetype eq { //.filename {1 index gcheck //.gcompatstringcopy exec 1 index exch /ResourcePath exch put} if }{ pop} ifelse
  exch pop
} put % Don't bind it here because gs_fapi.ps redefines .buildfont10

% ------ CIDFontType 2 (FontType 11) ------ %

dup 2 {
  11 //.checkfonttype exec pop
  1 index exch .buildfont11
  .currentresourcefile dup type /filetype eq { //.filename {1 index gcheck //.gcompatstringcopy exec 1 index exch /ResourcePath exch put} if }{ pop} ifelse
  exch pop
} put % Don't bind it here because gs_fapi.ps redefines .buildfont11

currentdict /.gcompatstringcopy .undef

pop		% .cidfonttypes


% ---------------- Reading CIDFontType 0 files ---------------- %

/StartData {		% <(Binary)|(Hex)> <datalength> StartData -
                        %   (currentdict is CID font dict)
                % If we're loading a resource file and the data format is
                % binary, we can just save a pointer to the data and load it
                % incrementally.
  mark {
                % Previous versions of this code made provisions for
                % reading hex-encoded data incrementally.  Since hex data
                % doesn't seem to be used in practice, we no longer bother.
    2 index (Binary) ne { stop } if
    currentfile .currentresourcefile ne { stop } if
                % Hack: the pdfwrite driver relies on finalization to write
                % out fonts.  However, the font may be finalized after the
                % resource file, in which case the resource file will be
                % closed.  So if the current output device is pdfwrite,
                % don't use incremental loading.
    /AllowIncrementalCFF /GetDeviceParam .special_op {
      exch pop {stop}if
    }if
    currentfile fileposition
  } //.internalstopped exec {
                % File is not positionable, or uses hex data.
                % Load the data now.
    cleartomark exch
    currentfile exch
    (Hex) eq { /ASCIIHexDecode filter } if
    exch
                % Stack: file length
    dup 65400 le {
                % readstring with a 0-length string causes a rangecheck,
                % but a data length of 0 is allowed.
      string dup () ne { 1 index exch readstring pop } if
    } {
      mark 3 1 roll {
                % Stack: mark str ... file length
        dup 0 eq { pop exit } if
        dup 65400 .min dup string 3 index exch readstring pop
                % Stack: mark str ... file length newstrlen newstr
        4 1 roll sub
      } loop
      counttomark 1 add 1 roll ]
    } ifelse
    /GlyphData exch def
    dup currentfile eq { pop } { closefile } ifelse
  } {
                % File is positionable and binary, just save a pointer.
                % Stack: (Binary) length -mark- pos
    /GlyphData 0 def
    exch pop 3 -1 roll pop exch
                % Stack: pos length
    /DataSource currentfile 2 index () .subfiledecode //true .reusablestream def
    currentfile 3 1 roll add setfileposition
  } ifelse
  /SubrCache 10 dict def
  CIDFontName currentdict /CIDFont defineresource pop
  end			% CID font dict
  end			% resource category dict
} bind def

% Some Adobe fonts include the line
%   /Setup /cid_Setup load def
% This is apparently included only to prevent proper, conforming PostScript
% interpreters (as opposed to ATM or a special Adobe font loader) from
% loading the font, since Setup is not referenced anywhere else in the file.
/cid_Setup { } def

% ------ Generic ------ %

% Read a string at a given offset in a "file" (binary file or
% GlyphData in RAM).
/ReadString {		% <pos> <string> ReadString <string>
  GlyphData 0 eq {
        % Read from the file.
    DataSource 3 -1 roll setfileposition
    DataSource exch readstring pop
  } {
        % Read from a string or an array of strings.
    GlyphData .stringsreadstring
  } ifelse
} bind def
/.stringsreadstring	% <pos> <string> <strings> .stringsreadstring
                        %   <vmstring>
{ dup type /stringtype eq
   { 3 1 roll length getinterval
   }
   {  {		% Stack: pos string glyphdata
        dup 0 get length dup 4 index gt { exit } if
        4 -1 roll exch sub 3 1 roll
        dup length 1 sub 1 exch getinterval
      }
     loop
                % Stack: pos string glyphdata glyphdata[0]length
                % We know no request can span more than 2 strings.
     3 index 3 index length add 1 index le
      {		% Request fits in a single string: just return a substring.
        pop 0 get 3 1 roll length getinterval
      }
      {		% Request spans 2 strings.  Copy the first part.
        1 index 0 get 4 index 3 -1 roll 1 index sub getinterval
        2 index copy
                % Copy the second part.
                % Stack: pos str glyphdata str1
        length exch 1 get 0 3 index length
        3 index sub getinterval 2 index 3 1 roll putinterval
        exch pop
      }
     ifelse
   }
  ifelse
} bind def

% Interpret a byte string as a (big-endian) integer.
/.cvbsi			% <bytes> .cvbsi <int>
{ 0 exch { exch 8 bitshift add } forall
} bind def

% Read an integer from binary data.
/.readint		% <pos> <nbytes> .readint <int>
{ string ReadString .cvbsi
} bind def

currentdict end

% ---------------- Rendering ---------------- %

% ------ CIDFontType 0 ------ %

/.readglyphdata {
  currentfont exch .type9mapcid
  FDArray exch get exch
} bind executeonly def

% BuildGlyph procedure for CIDFontType 0.
% The name %Type9BuildGlyph is known to the interpreter.
/.cid0buildstring 10 string def
(%Type9BuildGlyph) cvn {	% <cidfont> <cid> %Type9BuildGlyph -
  .currentglobal 3 1 roll 1 index gcheck .setglobal
  1 index begin
  dup //.readglyphdata exec dup //null eq {
                % Substitute CID 0. **** WRONG ****
    pop pop 0 //.readglyphdata exec
  } if
                % Stack: cidfont cid subfont charstring
  dup //null eq { pop pop pop pop } {	%**** WRONG ****
    4 -1 roll pop
    3 1 roll exch dup 4 -1 roll 0 0 moveto
    3 index /FontType get 2 eq { .type2execchar } { .type1execchar } ifelse
  } ifelse	%**** WRONG ****
  end
  .setglobal
} bind executeonly def

% ------ CIDFontType 2 ------ %

% BuildGlyph procedure for CIDFontType 2.
% The name %Type11BuildGlyph is known to the interpreter.
(%Type11BuildGlyph) cvn {	% <cidfont> <cid> %Type11BuildGlyph -
                % We must be prepared for out-of-range CIDs.
  2 copy { .type11mapcid } //.internalstopped exec {
    pop /CharStrings get /.notdef get
  } if
                        % Stack: cidfont cid glyphindex
  1 index exch .type42execchar
} bind executeonly def

% ---------------- Define resources ---------------- %

languagelevel exch 2 .setlanguagelevel

% Define the CIDInit ProcSet resource.
% The ProcSet dictionary is still on the stack.

% We might have loaded CMap support already.  However, Adobe's
% protected font downloader defines a CIDInit ProcSet that will be
% loaded from the filesystem later, so we must check specifically
% for the ProcSet being defined in VM.
/CIDInit /ProcSet 2 copy resourcestatus { pop 0 eq } { //false } ifelse {
  pop pop findresource dup length 4 index length add dict .copydict
  4 -1 roll exch .copydict
} {
  3 -1 roll
} ifelse exch defineresource pop

% Define the CIDFont resource category.
% We break out .buildcidfont because it appears that at least for
% Type 32 (CIDFontType 4) fonts, the font can be registered in the Font
% category with only a CIDFontType and no FontType.
/.buildcidfont {		% <name> <fontdict> .buildcidfont
                                %   <name> <cidfont>
  systemdict /ProvideUnicode .knownget not { //false } if {
    /FontEmulationProcs /ProcSet findresource
    /ProvideUnicodeDecoding get exec
  } if
  dup /CIDFontType get //.cidfonttypes exch get exec
} bind executeonly odef

/CIDFont /Generic /Category findresource dup length dict .copydict
dup /InstanceType /dicttype put
dup /DefineResource {
  dup /OrigFont known not {
     dup dup /OrigFont exch .growput  % CPSI does it. Adding just for CET 33_all.PS conformity.
  } if
  dup /PaintType known not {
     dup /PaintType 0 .growput  % CPSI does it. Adding just for CET 33_all.PS conformity.
  } if
  .buildcidfont
  /Generic /Category findresource /DefineResource get exec
} put
% CIDFonts may be defined in CFF OpenType files.
% Check for this here.
/.loadcidfontresource {
  dup .ResourceFile {
    {.loadfont} .execasresource
  } {
    dup /undefinedresource signalerror
  } ifelse
} bind def
dup /.LoadResource {
  currentglobal {
    //.loadcidfontresource exec
  } {
    //true setglobal {//.loadcidfontresource exec} stopped //false setglobal {stop} if
  } ifelse
} bind put

/Category defineresource pop

% Add the new FontType resources.

9 1 11 { dup /FontType defineresource pop } for

% Add the new FMapType resource.

9 dup /FMapType defineresource pop

% Define the CIDMap resource category.
% These aren't documented, but it's clear what they are for:
% to give names to CIDMaps for CIDFontType 2 fonts.

/CIDMap /Generic /Category findresource dup length dict .copydict
dup /.CheckResource {
        % Allow a string, an array of strings, or (as of Adobe release 3011)
        % a dictionary.
  dup type dup dup /stringtype eq exch /dicttype eq or {
    pop //true
  } {
    dup /arraytype eq exch /packedarraytype eq or {
      //true exch { type /stringtype eq and } forall
    } {
      //false
    } ifelse
  } ifelse
} bind put
/Category defineresource pop

.setlanguagelevel

%% Replace 1 (gs_ciddc.ps)
(gs_ciddc.ps) runlibfile

% Undef these, not needed outside this file
[
    /.checkfonttype
    /.loadcidfontresource
    /.readglyphdata
] {systemdict exch .forceundef} forall