harvey/sys/src/cmd/gs/lib/type1ops.ps

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% 
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% in a plain ASCII text file named PUBLIC.  The License grants you the right
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% requires that the copyright notice and this notice be preserved on all
% copies.

% $Id: type1ops.ps,v 1.2 2000/09/19 18:29:11 lpd Exp $
% type1ops.ps
% Define the Type 1 and Type 2 font opcodes for use by Ghostscript utilities.

% Define the default value of lenIV.
% Note that this expects the current font to be on the dictionary stack.

/lenIV { FontType 2 eq { -1 } { 4 } ifelse } def

% ---------------- Encoding ---------------- %

/Type1encode 70 dict

	% Data types

dup /nulltype {
  pop ()
} put
dup /nametype {
  Type1encode exch get
} put
dup /stringtype {
} put
dup /integertype {
  dup dup -107 ge exch 107 le and {
    139 add (x) dup 0 4 -1 roll put
  } {
    dup dup -1131 ge exch 1131 le and {
      dup 0 ge { 16#f694 } { neg 16#fa94 } ifelse add
      (xx) dup dup 0 4 index -8 bitshift put
      1 4 -1 roll 255 and put
    } {
      (\377xxxx) 1 1 4 {
	dup 8 mul 32 sub 3 index exch bitshift 255 and
	2 index 3 1 roll put
      } for exch pop
    } ifelse
  } ifelse
} put

	% Operators

% Identical or similar in Type 1 and Type 2.
/c_hstem 1 def   dup /hstem <01> put
/c_vstem 3 def   dup /vstem <03> put
/c_vmoveto 4 def   dup /vmoveto <04> put
/c_rlineto 5 def   dup /rlineto <05> put
/c_hlineto 6 def   dup /hlineto <06> put
/c_vlineto 7 def   dup /vlineto <07> put
/c_rrcurveto 8 def   dup /rrcurveto <08> put
/c_callsubr 10 def   /s_callsubr <0a> def   dup /callsubr s_callsubr put
/c_return 11 def   dup /return <0b> put
/c_escape 12 def
  /ce_div 12 def   /s_div <0c0c> def   dup /div s_div put
/c_endchar 14 def   /s_endchar <0e> def   dup /endchar s_endchar put
/c_rmoveto 21 def   dup /rmoveto <15> put
/c_hmoveto 22 def   dup /hmoveto <16> put
/c_vhcurveto 30 def   dup /vhcurveto <1e> put
/c_hvcurveto 31 def   dup /hvcurveto <1f> put
% Only in Type 1.
/c_closepath 9 def   dup /closepath <09> put
/c_hsbw 13 def   /s_hsbw <0d> def   dup /hsbw s_hsbw put
  /ce_dotsection 0 def   /s_dotsection <0c06> def   dup /dotsection s_dotsection put
  /ce_vstem3 1 def   /s_vstem3 <0c01> def   dup /vstem3 s_vstem3 put
  /ce_hstem3 2 def   /s_hstem3 <0c02> def   dup /hstem3 s_hstem3 put
  /ce_seac 6 def   /s_seac <0c06> def	dup /seac s_seac put
  /ce_sbw 7 def   /s_sbw <0c07> def   dup /sbw s_sbw put
  /ce_callothersubr 16 def   /s_callothersubr <0c10> def   dup /callothersubr s_callothersubr put
  /ce_pop 17 def   /s_pop <0c11> def   dup /pop s_pop put
  /ce_setcurrentpoint 33 def   /s_setcurrentpoint <0c21> def   dup /setcurrentpoint s_setcurrentpoint put
  /s_setcurrentpoint_hmoveto s_setcurrentpoint <8b16> concatstrings def
% Only in Type 2.
dup /blend <10> put
dup /hstemhm <12> put
dup /hintmask <13> put
dup /cntrmask <14> put
dup /vstemhm <17> put
dup /rcurveline <18> put
dup /rlinecurve <19> put
dup /vvcurveto <1a> put
dup /hhcurveto <1b> put
dup /callgsubr <1d> put
  dup /and <0c03> put
  dup /or <0c04> put
  dup /not <0c05> put
  dup /store <0c08> put
  dup /abs <0c09> put
  dup /add <0c0a> put
  dup /sub <0c0b> put
  dup /load <0c0d> put
  dup /neg <0c0c> put
  dup /eq <0c0f> put
  dup /drop <0c12> put
  dup /put <0c14> put
  dup /get <0c15> put
  dup /ifelse <0c16> put
  dup /random <0c17> put
  dup /mul <0c18> put
  dup /sqrt <0c1a> put
  dup /dup <0c1b> put
  dup /exch <0c1c> put
  dup /index <0c1d> put
  dup /roll <0c1e> put
  dup /hflex <0c22> put
  dup /flex <0c23> put
  dup /hflex1 <0c24> put
  dup /flex1 <0c25> put

readonly def

% ---------------- Decoding ---------------- %

/Type1decode 512 array

Type1encode {
  dup type /stringtype eq {
    dup length 1 eq { 0 get } { 1 get 256 add } ifelse
		% stack: array key code
    exch 2 index 3 1 roll put
  } {
    pop pop
  } ifelse
} forall

dup 12 {
  dup read pop dup Type1decode exch 256 add get dup null ne
    { exch pop }
    { pop 2 string dup 0 12 put dup 1 4 -1 roll put }
  ifelse
} put
dup 28 {		% Type 2 only
  dup read pop 128 xor 128 sub 8 bitshift
  1 index read pop add
} put
32 1 246 { 2 copy dup 139 sub put pop } for
dup 247 { dup read pop 108 add } put
dup 248 { dup read pop 364 add } put
dup 249 { dup read pop 620 add } put
dup 250 { dup read pop 876 add } put
dup 251 { dup read pop 108 add neg } put
dup 252 { dup read pop 364 add neg } put
dup 253 { dup read pop 620 add neg } put
dup 254 { dup read pop 876 add neg } put
dup 255 {		% Different for Type 1 and Type 2
  dup read pop 128 xor 128 sub
  3 { 8 bitshift 1 index read pop add } repeat
  FontType 2 eq { 65536.0 div } if
} put

readonly def

% ---------------- Procedures ---------------- %

% For these utilities, a CharString is represented by a sequence of
% integers, reals, strings, and names, either in an array or on the stack.
% Integers and reals represent themselves; strings are other data that
% appears in the CharString; names are CharString operator names.
% A CharString in an array is called a "charproc"; a CharString on
% the stack is called a "charstack", and is delimited by a mark.
% Individual elements are called "chartokens".

% ------ Encoding ------ %

% Get the string for a chartoken.
% Note that this string may be overwritten by the next call.
/chartoken_string {	% <chartoken> chartoken_string <string>
  dup type Type1encode exch get exec
} bind def
% Compute the length of a CharString.
/chartoken_length {	% <chartoken> chartoken_length <length>
  chartoken_string length
} bind def
/charproc_length {	% <charproc> charproc_length <length>
  0 exch { chartoken_length add } forall
} bind def
/charstack_length {	% <charstack> charstack_length <charstack> <length>
  counttomark 0 exch -1 1 { index chartoken_length add } for
} bind def

% Write a CharString to a file.  Normally this will be a NullEncode filter
% writing on a string of the correct length.
/chartoken_write {	% <file> <chartoken> chartoken_write -
  chartoken_string writestring
} bind def
/charproc_write {	% <file> <charproc> charproc_write -
  { 1 index exch chartoken_write } forall pop
} bind def
% Note that the arguments of charstack_write are backwards.
/charstack_write {	% <charstack> <file> charstack_write -
  counttomark 1 sub -1 1 { index 1 index exch chartoken_write } for
  cleartomark
} bind def

% Convert a charproc or charstack to an *un*encrypted CharString.
/charproc_string {	% <charproc> charproc_string <string>
  mark exch aload pop charstack_string
} bind def
/charstack_string {	% <charstack> charstack_string <string>
  charstack_length lenIV 0 gt {
    lenIV add string
    dup dup length lenIV sub lenIV exch getinterval	% skip lenIV
  } {
    string
  } ifelse
  /NullEncode filter
  exch 1 index counttomark 1 add 2 roll
  charstack_write closefile
%   lenIV 0 ge { 4330 exch dup .type1encrypt exch pop readonly } if
} bind def

% ------ Decoding ------ %

% Decode a CharString (unencrypted).
/charstack_read {	% <file> charstack_read <no-mark-charstack>
  { dup read not { pop exit } if
    Type1decode 1 index get dup null eq {
      pop 1 string dup 0 4 -1 roll put
    } {
      exch pop exec
    } ifelse exch
  } loop
} bind def