Mini Shell

% Copyright (C) 2001-2021 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.
%

% Initialization file for binary tokens.
% When this is run, systemdict is still writable,
% but everything defined here goes into level2dict.

% Define whether or not to allow writing dictionaries.
% This is a non-standard feature!
/WRITEDICTS //false def

languagelevel 1 .setlanguagelevel
level2dict begin

% Initialization for the system name table.

mark
% 0
        /abs /add /aload /anchorsearch /and
        /arc /arcn /arct /arcto /array
        /ashow /astore /awidthshow /begin /bind
        /bitshift /ceiling /charpath /clear /cleartomark
% 20
        /clip /clippath /closepath /concat /concatmatrix
        /copy /count /counttomark /currentcmykcolor /currentdash
        /currentdict /currentfile /currentfont /currentgray /currentgstate
        /currenthsbcolor /currentlinecap /currentlinejoin /currentlinewidth /currentmatrix
% 40
        /currentpoint /currentrgbcolor /currentshared /curveto /cvi
        /cvlit /cvn /cvr /cvrs /cvs
        /cvx /def /defineusername /dict /div
        /dtransform /dup /end /eoclip /eofill
% 60
        /eoviewclip /eq /exch /exec /exit
        /file /fill /findfont /flattenpath /floor
        /flush /flushfile /for /forall /ge
        /get /getinterval /grestore /gsave /gstate
% 80
        /gt /identmatrix /idiv /idtransform /if
        /ifelse /image /imagemask /index /ineofill
        /infill /initviewclip /inueofill /inufill /invertmatrix
        /itransform /known /le /length /lineto
% 100
        /load /loop /lt /makefont /matrix
        /maxlength /mod /moveto /mul /ne
        /neg /newpath /not /null /or
        /pathbbox /pathforall /pop /print /printobject
% 120
        /put /putinterval /rcurveto /read /readhexstring
        /readline /readstring /rectclip /rectfill /rectstroke
        /rectviewclip /repeat /restore /rlineto /rmoveto
        /roll /rotate /round /save /scale
% 140
        /scalefont /search /selectfont /setbbox /setcachedevice
        /setcachedevice2 /setcharwidth /setcmykcolor /setdash /setfont
        /setgray /setgstate /sethsbcolor /setlinecap /setlinejoin
        /setlinewidth /setmatrix /setrgbcolor /setshared /shareddict
% 160
        /show /showpage /stop /stopped /store
        /string /stringwidth /stroke /strokepath /sub
        /systemdict /token /transform /translate /truncate
        /type /uappend /ucache /ueofill /ufill
% 180
        /undef /upath /userdict /ustroke /viewclip
        /viewclippath /where /widthshow /write /writehexstring
        /writeobject /writestring /wtranslation /xor /xshow
        /xyshow /yshow /FontDirectory /SharedFontDirectory /Courier
% 200
        /Courier-Bold /Courier-BoldOblique /Courier-Oblique /Helvetica /Helvetica-Bold
        /Helvetica-BoldOblique /Helvetica-Oblique /Symbol /Times-Bold /Times-BoldItalic
        /Times-Italic /Times-Roman /execuserobject /currentcolor /currentcolorspace
        /currentglobal /execform /filter /findresource /globaldict
% 220
        /makepattern /setcolor /setcolorspace /setglobal /setpagedevice
        /setpattern
% pad to 256
        counttomark 256 exch sub { 0 } repeat
% 256
        /= /== /ISOLatin1Encoding /StandardEncoding
% 260
        ([) cvn (]) cvn /atan /banddevice /bytesavailable
        /cachestatus /closefile /colorimage /condition /copypage
        /cos /countdictstack /countexecstack /cshow /currentblackgeneration
        /currentcacheparams /currentcolorscreen /currentcolortransfer /currentcontext /currentflat
% 280
        /currenthalftone /currenthalftonephase /currentmiterlimit /currentobjectformat /currentpacking
        /currentscreen /currentstrokeadjust /currenttransfer /currentundercolorremoval /defaultmatrix
        /definefont /deletefile /detach /deviceinfo /dictstack
        /echo /erasepage /errordict /execstack /executeonly
% 300
        /exp /false /filenameforall /fileposition /fork
        /framedevice /grestoreall /handleerror /initclip /initgraphics
        /initmatrix /instroke /inustroke /join /kshow
        /ln /lock /log /mark /monitor
% 320
        /noaccess /notify /nulldevice /packedarray /quit
        /rand /rcheck /readonly /realtime /renamefile
        /renderbands /resetfile /reversepath /rootfont /rrand
        /run /scheck /setblackgeneration /setcachelimit /setcacheparams
% 340
        /setcolorscreen /setcolortransfer /setfileposition /setflat /sethalftone
        /sethalftonephase /setmiterlimit /setobjectformat /setpacking /setscreen
        /setstrokeadjust /settransfer /setucacheparams /setundercolorremoval /sin
        /sqrt /srand /stack /status /statusdict
% 360
        /true /ucachestatus /undefinefont /usertime /ustrokepath
        /version /vmreclaim /vmstatus /wait /wcheck
        /xcheck /yield /defineuserobject /undefineuserobject /UserObjects
        /cleardictstack
% 376
        /A /B /C /D /E /F /G /H /I /J /K /L /M
        /N /O /P /Q /R /S /T /U /V /W /X /Y /Z
        /a /b /c /d /e /f /g /h /i /j /k /l /m
        /n /o /p /q /r /s /t /u /v /w /x /y /z
% 428
        /setvmthreshold (<<) cvn
        (>>) cvn /currentcolorrendering /currentdevparams /currentoverprint /currentpagedevice
        /currentsystemparams /currentuserparams /defineresource /findencoding /gcheck
% 440
        /glyphshow /languagelevel /product /pstack /resourceforall
        /resourcestatus /revision /serialnumber /setcolorrendering /setdevparams
        /setoverprint /setsystemparams /setuserparams /startjob /undefineresource
        /GlobalFontDirectory /ASCII85Decode /ASCII85Encode /ASCIIHexDecode /ASCIIHexEncode
% 460
        /CCITTFaxDecode /CCITTFaxEncode /DCTDecode /DCTEncode /LZWDecode
        /LZWEncode /NullEncode /RunLengthDecode /RunLengthEncode /SubFileDecode
        /CIEBasedA /CIEBasedABC /DeviceCMYK /DeviceGray /DeviceRGB
        /Indexed /Pattern /Separation /CIEBasedDEF /CIEBasedDEFG
% 480
        /DeviceN
% 481 -- end
//.packtomark exec .installsystemnames

% Define printobject and writeobject.
% These are mostly implemented in PostScript, so that we don't have to
% worry about interrupts or callbacks when writing to the output file.

% Define procedures for accumulating the space required to represent
% an object in binary form.
%	<#refs> <#chars> <obj> -proc- <#refs'> <#chars'>
/cntdict mark
  /integertype /pop load
  /realtype 1 index
  /marktype 1 index
  /nulltype 1 index
  /booleantype 1 index
  /nametype { length add } .bind
  /stringtype 1 index
  /arraytype 0	% replaced below
  /dicttype 0	% replaced below
.dicttomark def
/.cntobj {
  dup type //cntdict exch get exec
} .bind def
cntdict /arraytype {
  dup length            % #refs #chars array len
  4 -1 roll add         % #chars array #refs+len
  dup 65536 gt {
    /writeobject .systemvar /limitcheck signalerror
  } if
  3 1 roll              % #refs+len #chars array
  //.cntobj forall
} .bind put	% replace arraytype in cntdict

cntdict /dicttype {
  /writeobject .systemvar /typecheck signalerror
} bind put


/.bosheader {		% <top_length> <total_length> <string8> .bosheader
                        %   <string4|8>
  dup 0 currentobjectformat 127 add put		% object format => BOS tag
  2 index 255 le 2 index 65531 le and {
        % Use the short header format: tag toplen(1) totlen(2)
    exch 4 add exch
    0 4 getinterval
    dup 1 5 -1 roll put
  } {
        % Use the long header format: tag 0(1) toplen(2) totlen(4)
    exch 8 add exch
     0 0 4 2 roll .bosobject exch pop exch pop	% store with byte swapping
  } ifelse		% Stack: shortlen str
  exch dup -8 bitshift exch 255 and	% str hibyte lobyte
  currentobjectformat 1 and 0 eq {	% lsb first
    exch
  } if
  2 index 3 3 -1 roll put
  1 index 2 3 -1 roll put
} .bind def

/.writeobjects {	% <file> <tag> <array> .writeobjects -
  % Apply the tag early and forget about it.
  (12345678) dup 1 5 -1 roll       % file array (...) (...) 1 tag
  put exch                         % file (.t.) array

  % Calculate the space required for refs and strings.
  % Reject excessively large graphs or graphs with loops.
  0 0                              % file (.t.) array #refs #chars
  2 index //.cntobj exec           % file (.t.) array #refs #chars

  % Write the header.
  1 index 8 mul add                % file (.t.) array #refs #refs*8+#chars
  2 index length exch (12345678)   % file (.t.) array #refs len(array) #refs*8+#chars (...)
  //.bosheader exec                % file (.t.) array #refs (...)
  4 index exch writestring         % file (.t.) array #refs

  % Traverse an array tree in width-first order and place all the
  % arrays that are found on the operand stack. Acyclic graphs are
  % expanded to trees. The top parameter K indicates the number
  % of arrays on a given depth level. At the root level, K is equal to 1.
  mark 2 index 1                   % file (.t.) array #refs -mark- array K
  { dup 0 le { pop exit } if
    dup {
      dup index {
        dup type /arraytype eq {
          exch 1 add
        } {
          pop
        } ifelse
      } forall
      1 sub
    } repeat
  } loop                           % file (.t.) array #refs -mark- array1 ... arrayN
  counttomark 5 add -4 roll        % -mark- array1 ... arrayN file (.t.) array #refs

  % Write the content of the root array
  8 mul                            % -mark- array1 ... arrayN file (.t.) array #refs*8
  exch dup length 8 mul            % -mark- array1 ... arrayN file (.t.) #refs*8 array len(array)*8
  3 1 roll                         % -mark- array1 ... arrayN file (.t.) len(array)*8 #refs*8 array
  { 3 index                        % -mark- array1 ... arrayN file (.t.) len(array)*8 #refs*8 obj (.t.)
    .bosobject                     % -mark- array1 ... arrayN file (.t.) len(array)*8 #refs*8 (.t.)
    4 index exch writestring       % -mark- array1 ... arrayN file (.t.) len(array)*8 #refs*8
  } forall
  3 -1 roll pop                    % -mark- array1 ... arrayN file len(array)*8 #refs*8

  % Write the remaining arrays
  counttomark 2 sub -1 3 {
    index {                       % ... file #refs #str obj
        (1\000345678) .bosobject  % ... file #refs #str (...)
        3 index exch writestring  % ... file #refs #str
    } forall
  } for
  pop pop                         % -mark- array1 ... arrayN file

  % Write strings and names.
  counttomark 1 sub -1 1 {
    index {
      dup type /nametype eq {
        .namestring
      } if
      dup type /stringtype eq {
        1 index exch writestring
      } {
        pop
      } ifelse
    } forall
  } for

  cleartomark		% Clean up
} .bind def

/.writeobject {
  3 copy exch
                % We must allocate the array in local VM
                % to avoid a possible invalidaccess.
  .currentglobal //false .setglobal exch 1 array astore exch .setglobal
  //.writeobjects exec pop pop pop
} .bind def

/printobject {		% <obj> <tag> printobject -
  currentobjectformat 0 eq {
      /printobject .systemvar /undefined signalerror
  } if
  (%stdout) (w) file 2 index 2 index //.writeobject exec pop pop
} odef

/writeobject {		% <file> <obj> <tag> writeobject -
  currentobjectformat 0 eq {
      /writeobject .systemvar /undefined signalerror
  } if
  2 .argindex pop	% check # of args
  //.writeobject exec
} odef

% Implement binary error message output.
/.objectprinttest {		% <obj> .objectprinttest -
                % This is a pseudo-operator so it will restore the stack
                % if it gets an error.
  mark 0 0 3 .argindex //.cntobj exec cleartomark pop
} bind def
/.printerror {
  $error /binary get .languagelevel 2 ge and {
    currentobjectformat 0 ne {
      [ /Error $error /errorname get $error /command get
                % Convert the object with cvs if it isn't printable.
      dup { //.objectprinttest exec } //.internalstopped exec {
        pop 100 string cvs
      } if
      //false ] 250 printobject
    }
    //.printerror	% known to be a procedure
    ifelse
  }
  //.printerror		% known to be a procedure
  ifelse
} bind def

currentdict /cntdict .undef

% End of level2dict

end
.setlanguagelevel

% undefine things defined in this file and not referenced elsewhere
[
    /.objectprinttest
    /.bosheader
    /.cntobj
    /.writeobject
    /.writeobjects
] dup level2dict .undefinternalnames
systemdict .undefinternalnames