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% 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.
%

% Extending Font resource category with CIDFont-CMap fonts.

languagelevel 2 .setlanguagelevel currentglobal //true setglobal

% In the comments below, 'CSI' is an abbreviation/acronym for CIDSystemInfo.
% We pre-scan resource files to retrieve the CSI from them.
% First we define a hidden procset .prs_dict containing
% necessary variables and procedures.
% Then we redefine the old /Font category using this procset.

% We maintain internal caches for the CSI values retrieved from
% resource files. This supposes that document doesn't uninstall
% resource files. To disable caching, set enable_cache to false.

% We assume that names starting with '.prs' do not appear in resource files.
% If this causes any problem, this prefix should be systematically changed
% in this file.  ('prs' is an abbreviation for 'prescan'.)

25 dict begin

% Define local variables :

/.prs_dict currentdict def       % self-reference (constant)
/.prs_empty 0 dict readonly def
/path_buffer 8192 string def
/name_buffer 1024 string def
/minus (-) 0 get def             % character code constant for '-'
/period (.) 0 get def            % character code constant for '.'
/CMap 10 dict def                % CSI cache for CMaps
/CIDFont 10 dict def             % CSI cache for CIDFonts
/enable_cache //true def         % set false to disable cache

% The folloving variables are just placeholders for ones to be set
% dynamically :
/.prsFile 0 def                   % file to prescan
/.prsResult 0 def                 % result of prescan
/.prsDictCount 0 def              % save the dictionary stack depth

% Define a dummy CIDInit procset to use while pre-scanning :

/DummyCIDInit 15 dict
begin

/begincmap {} def
  /usecmap {pop} bind def

{stop} bind
  [ /begincodespacerange /endcodespacerange /beginnotdefchar /endnotdefchar
    /beginnotdefrange /endnotdefrange /begincidchar /endcidchar /begincidrange
    /endcidrange /endcmap /usefont /StartData
  ] {
    1 index def
  } bind forall
  pop

currentdict end def

% Define a local 'findresource' for pre-scanning :
% (it returns the dummy CIDInit instead of the regular CIDInit ProcSet)

/findresource { % <InstName> <CatName> findresource <inst>
 2 copy /ProcSet eq exch % /InstName /CatName bool /InstName
 /CIDInit eq and {
 pop pop //DummyCIDInit
 } {
 //findresource exec
 } ifelse
} bind def

% Define procedures for pre-scanning :

/StopIfCSIDefined {   % - StopIfCSIDefined -

% Check if the dictionary stack contains a dictionary containing /CIDSystemInfo.
  % The search is limited to the top .prsDictCount dictionaries in the stack.
  % If so, retrieve the CSI, and execute stop to terminate the pre-scanning of the file.
  % Otherwise, do nothing, so the pre-scanning continues.

countdictstack //.prs_dict /.prsDictCount get sub dup {
    currentdict /CIDSystemInfo .knownget {
      //.prs_dict exch /.prsResult exch put
      stop
    } if
    currentdict exch end
  } repeat {
    begin
  } repeat
} bind def

/PrescanFile {     % - PrescanFile -
  { //.prs_dict /.prsFile get token {
      dup type                          % token type
      dup /nametype eq exch /operatortype eq or {
        dup xcheck {
          exec
          //StopIfCSIDefined exec
        } if
      } if
    } {
      stop
    } ifelse
  } loop
} bind odef

/GetCIDSystemInfoFromFile { % <file> GetCIDSystemInfoFromFile <CSI>

% This procedure reads resource files with 'token',
  % executing the tokens untill /CIDSystemInfo appears to be defined.
  % Normally the resource file creates a new dictionary on
  % dictionary stack and defines /CIDSystemInfo in it.
  %
  % Returns an empty dictionary if no CIDSystemInfo is found.

RESMPDEBUG { (cidcm GetCIDSystemInfoFromFile beg) = } if
  //.prs_dict begin
  /.prsFile exch def
  /.prsResult //.prs_empty def
  /.prsDictCount countdictstack def
  RESMPDEBUG { (cidcm GetCIDSystemInfoFromFile will PrescanFile.) = } if
  { //PrescanFile } stopped pop
  //.prs_dict /.prsResult get
  end
  RESMPDEBUG { (cidcm GetCIDSystemInfoFromFile end) = } if
} bind def

/GetCIDSystemInfo { % <InstName> <CatName> GetCIDSystemInfo <CSI>

% Retrieve CSI, using caches.

RESMPDEBUG { (cidcm GetCIDSystemInfo beg) = } if
 /Category findresource begin % /InstName
 dup ResourceStatus
 {
 pop 2 lt {
 FindResource /CIDSystemInfo .knownget not {
 //.prs_empty
 } if % CSI
 } { % /InstName
 currentdict /GetCIDSystemInfoFromMap .knownget {
 exec
 } if
 dup type /nametype eq
 {
 RESMPDEBUG { (cidcm GetCIDSystemInfo got a name.) = } if
 //.prs_dict Category get % /InstName CSIs
 dup 2 index known
 //enable_cache and {
 RESMPDEBUG { (cidcm GetCIDSystemInfo from cache.) = } if
 exch get % CSI
 } {
 RESMPDEBUG { (cidcm GetCIDSystemInfo from file.) = } if
 exch % CSIs /InstName
 dup //path_buffer ResourceFileName % CSIs /InstName (path)
 RESMPDEBUG { (cidcm GetCIDSystemInfo from file ) print dup = } if
 currentglobal exch //true setglobal % CSIs /InstName g (path)
 mark exch % CSIs /InstName g [ (path)
 { (r) file } stopped {
 cleartomark //.prs_empty
 } {
 exch 1 index % CSIs /InstName g file [ file
 //GetCIDSystemInfoFromFile stopped {
 cleartomark closefile //.prs_empty
 } {
 exch pop exch closefile
 } ifelse
 } ifelse % CSIs /InstName g CSI
 exch setglobal % CSIs /InstName CSI
 dup 4 1 roll % CSI CSIs /InstName CSI
 put % CSI
 RESMPDEBUG {
 (cidcm GetCIDSystemInfo got from file : <<) print
 dup { exch //=string cvs print ( ) print
 //=string cvs print ( ) print
 } forall
 (>>) =
 } if
 } ifelse
 } if
 } ifelse
 } {
 pop //.prs_empty
 } ifelse
 end
 RESMPDEBUG { (cidcm GetCIDSystemInfo end) = } if
} bind def

/IsCompatibleCSI { % <CSI-M> <CSI-F> IsCompatibleCSI <bool>

% The CSI in a CIDFont may be an array, a dict, or null.
  % If it is an array, it must be of 1 element, which is a dict.
  % In this case the dict is used for testing the compatibility.
  % Two dicts are compatible iff they contain same /Ordering and /Registry.
  % Identity CMap is compatible with any CIDFont.

exch % CSI-F CSI-M
 { dup type /arraytype eq {
 dup length 1 ne {
 pop pop //false exit
 } if
 0 get
 } if % CSI-F CSI-M
 dup type /dicttype ne {
 pop pop //false exit
 } if % CSI-F <<CSI-M>>
 exch % <<CSI-M>> CSI-F
 dup type /dicttype ne {
 pop pop //false exit
 } if % <<CSI-M>> <<CSI-F>>
 dup /Ordering .knownget {
 /Identity eq {
 pop pop //true exit
 } if
 } if
 //true % <<CSI-M>> <<CSI-F>> bEQ
 [/Registry /Ordering] {
 2 index 1 index .knownget not {
 1234567
 } if % <<CSI-M>> <<CSI-F>> bEQ /key vF
 exch % <<CSI-M>> <<CSI-F>> bEQ vF /key
 4 index exch .knownget not {
 7654321
 } if % <<CSI-M>> <<CSI-F>> bEQ vF vM
 eq and % <<CSI-M>> <<CSI-F>> bEQ
 } forall
 exch pop exch pop % bEQ
 exit
 } loop
} bind def

/IsWellComposed { % <CIDFontName> <CMapName> IsWellComposed <bool>

% Check if the given CIDFont and CMap have compatible CSIs.
  exch                                  % /CMapName /CIDFontName
  /CIDFont //GetCIDSystemInfo exec      % /CMapName CSI-F
  dup type /dicttype eq {
    dup length 0 ne {
      exch                              % CSI-F /CMapName
      /CMap //GetCIDSystemInfo exec     % CSI-F CSI-M
      //IsCompatibleCSI exec            % bool
    } {
      pop pop //false
    } ifelse
  } {
    pop pop //false
  } ifelse
} bind def

/IsComposedFont { % <FontName> IsComposedFont <CIDFontName> <CMapName> true
 % <FontName> IsComposedFont false

% Check if the given font name may be decomposed into CIDFont.CMap, CIDFont-CMap
  % or into CIDFont--CMap, such that CIDFont and CMap have compatible CSIs.
                                        % FontName
  dup type /stringtype ne {
    //name_buffer cvs
  } if                                  % (FontName)
  { dup length 2 sub -1 1 {
                                        % (FontName) i
      2 copy get dup //minus eq exch //period eq or {
        2 copy 2 copy                   % (FontName) i (FontName) i (FontName) i
        2 copy get //minus eq {
          2 copy 1 sub get //minus eq {
            1 sub
          } if
        } if                            % (FontName) i (FontName) i (FontName) i0
        0 exch getinterval cvn          % (FontName) i (FontName) i /CIDFontName
        3 1 roll                        % (FontName) i /CIDFontName (FontName) i
        1 add dup                       % (FontName) i /CIDFontName (FontName) i1 i1
        5 index length                  % (FontName) i /CIDFontName (FontName) i1 i1 l
        exch sub getinterval cvn        % (FontName) i /CIDFontName /CMapName
        2 copy //IsWellComposed exec {  % (FontName) i /CIDFontName /CMapName
          4 2 roll pop pop              % /CIDFontName /CMapName
          stop
        } if
        pop pop pop
      } {
        pop
      } ifelse                          % (FontName)
    } for
    pop
  } stopped
} bind def

/ComposeName { % <CIDFont> <CMap> <scr> ComposeName <CIDFont-CMap>
 dup dup 5 2 roll % (scr) (scr) /CIDFont /CMap (scr)
 3 2 roll exch cvs length dup % (scr) (scr) /CMap l0 l0
 4 -1 roll exch //minus put % (scr) /CMap l0
 1 add dup % (scr) /CMap l1 l1
 3 index dup length % (scr) /CMap l1 l1 (scr) L
 2 index sub % (scr) /CMap l1 l1 (scr) LT
 3 2 roll % (scr) /CMap l1 (scr) LT l1
 exch getinterval % (scr) /CMap l1 (scrT)
 3 2 roll exch cvs length % (scr) l1 l2
 add 0 exch getinterval % (CIDFont-CMap)
} bind def

% Redefine the /Font category with CIDFont-CMap construction :

% The following code supposes that the following names are not
% defined in the old /Font category dictionary :
% /IsComposedFont, /IsWellComposed .

/Font /Category findresource dup length dict copy begin

/FindResource { % <InstName> FindResource <inst>
 dup //ResourceStatus exec {
 pop pop //FindResource exec
 } {
 dup //IsComposedFont exec { % /FontName /CIDFontName /CMapName
 exch [ exch ] composefont % inst
 } {
 //FindResource exec
 } ifelse
 } ifelse
} bind executeonly def

/ResourceStatus { % <InstName> ResourceStatus <nStatus> <nSize> true
 % <InstName> ResourceStatus false
 dup //ResourceStatus exec {
 3 2 roll pop //true % nStatus nSize true
 } {
 //IsComposedFont exec { % /CIDFontName /CMapName
 /CMap resourcestatus { % /CIDFontName nStatusM nSizeM
 exch pop exch % nSizeM /CIDFontName
 /CIDFont resourcestatus { % nSizeM nStatusF nSizeF
 exch pop % nSizeF nSizeM
 dup 0 ge {
 exch dup 0 ge {
 add
 } {
 exch pop
 } ifelse
 } {
 pop
 } ifelse % nSize
 2 exch //true % nStatus nSize true
 } {
 pop pop pop //false % work around buggy resource file
 } ifelse
 } {
 pop pop pop //false % work around buggy resource file
 } ifelse
 } {
 //false
 } ifelse
 } ifelse
} bind executeonly def

/ResourceForAll { % <template> <proc> <scratch> ResourceForAll -

% We suppose that the resourceforall procedure does not
  % define or install new fonts, CMaps, and/or CIDFonts.

% First we create 3 temporary dictionaries to store temporary data
 % about fonts, CMaps and CIDFonts.
 % These dictionaries must be created dynamically, to allow for a possible
 % recursive call to resourceforall from the resourceforall procedure.
 currentglobal //false setglobal
 20 dict 20 dict 20 dict % (templ) proc (scr) g <<CIDFont>> <<CMap>> <<Fonts>>

% Store resource identifiers into local dictionaries
  % A resource instance can have a key that is not a name or a string. In this
  % case, resourceforall passes the key directly to proc instead of copying it
  % into the scratch string. This case can arise only for a resource instance
  % defined in virtual memory by a previous defineresource

% Discard non-string keys of CIDFont and CMap because <CIDFontName>-<CMapName>
 % is only defined for names.

{ /.DisableResourceOrdering pop % gs_resmp accesses this through execstack - don't remove !

6 index [ 2 index {exch //null put} aload pop ] cvx bind 6 index //ResourceForAll exec

(*) [ 3 index {exch dup type /stringtype eq { cvn dup put } { pop pop } ifelse } aload pop
        ] cvx bind 6 index /CMap resourceforall

(*) [ 4 index {exch dup type /stringtype eq { cvn dup put } { pop pop } ifelse } aload pop
        ] cvx bind 6 index /CIDFont resourceforall

exit
 } loop % This loop is a pattern for execstack_lookup - don't remove !
 4 -1 roll setglobal % (templ) proc (scr) <<CIDFont>> <<CMap>> <<Fonts>>

%% Make the list of fonts in the form (/Name status) :

% (templ) proc (scr) <<CIDFont>> <<CMap>> <<Fonts>>
 dup {
 pop dup
 //ResourceStatus exec {
 pop 2 index % (templ) proc (scr) <<CIDFont>> <<CMap>> <<Fonts>> /Name nStatus <>
 3 1 roll put % (templ) proc (scr) <<CIDFont>> <<CMap>> <<Fonts>>
 } {
 pop
 } ifelse
 } forall % (templ) proc (scr) <<CIDFont>> <<CMap>> <<Fonts>>

%% Add CIDFont-CMap to it (filtering duplicates) :

3 2 roll {
 3 index {
 3 1 roll % (templ) proc (scr) <<CMap>> <> /CIDFont /CMap /CIDFont /CMap
 6 index //ComposeName exec % (templ) proc (scr) <<CMap>> <> /CIDFont /CMap (Font)
 dup 8 index .stringmatch {
 cvn % (templ) proc (scr) <<CMap>> <> /CIDFont /CMap /Font
 dup 4 index exch known {
 pop pop
 } {
 2 index % (templ) proc (scr) <<CMap>> <> /CIDFont /CMap /Font /CIDFont
 4 2 roll % (templ) proc (scr) <<CMap>> <> /Font /CIDFont /CIDFont /CMap
 //IsWellComposed exec {
 exch 2 index exch 2 put % (templ) proc (scr) <<CMap>> <> /CIDFont
 } {
 exch pop
 } ifelse
 } ifelse
 } {
 pop pop
 } ifelse
 dup % (templ) proc (scr) <<CMap>> <> /CIDFont /CIDFont
 } forall
 pop pop % (templ) proc (scr) <<CMap>> <>
 } forall % (templ) proc (scr) <<CMap>> <>
 exch pop % (templ) proc (scr) <>
 4 3 roll pop % proc (scr) <>

% Make the enumerator and apply it :
  /MappedCategoryRedefiner /ProcSet findresource /MakeResourceEnumerator get exec exec
} bind executeonly def

currentdict end /Font exch /Category defineresource pop
end
setglobal .setlanguagelevel

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