path: root/toolbin/encs2c.ps

%!
% Copyright (C) 2001-2023 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.,  39 Mesa Street, Suite 108A, San Francisco,
% CA 94129, USA, for further information.
%

% Generate a C file containing the standard encodings and glyph sets.

% This program probably never needs to be run again: it is included mostly
% for reference.  It reads in the known Encodings and pseudo-Encodings
% (see the definition of /encfiles below) and generates C files that
% represent them in a compact format described in src/gscencs.c.
%
% If this file does need to be run again (and it has been in December 2020) you
% should generate all 4 files (gscedata.[c,h] and gdevpdtv.[c,h] by running this
% program 4 times, once for each output file.
%
% The generated files are named gscedata.[ch] and are included in the
% source distribution in the src directory.  The canonical invocation is
%   gs -dNOSAFER -Ilib -dNODISPLAY -q -SO=gscedata.h toolbin/encs2c.ps > src/gscedata.h
%   gs -dNOSAFER -Ilib -dNODISPLAY -q -SO=gscedata.c toolbin/encs2c.ps > src/gscedata.c
%
% NOTE: If the C representation of encodings changes, this file
% (toolbin/encs2c.ps), src/gscencs.h, and src/gscencs.c must be kept
% consistent with each other.
%
% This program also generates a table of glyphs available in
% WinAnsiEncoding, StandardEncoding, MacExpertEncoding, SymbolEncoding
% for pdfwrite device.
%
%   gs -dNOSAFER -Ilib -dNODISPLAY -q -SO=gdevpdtv.h toolbin/encs2c.ps > src/gdevpdtv.h
%   gs -dNOSAFER -Ilib -dNODISPLAY -q -SO=gdevpdtv.c toolbin/encs2c.ps > src/gdevpdtv.c
%
% For "-Ilib" you need to point that at a valid "lib" directory from
% the ghostpdl tree - since gs_css_e.ps now lives there.

% .namestring is longer available as an operator, define an
% equivalent here
/.namestring
{
  dup length string cvs
} bind def


% ================ Write header file ================ %

% Free variables: maxlen.
/writeheader {
  (#ifndef gscedata_INCLUDED) =
  (#  define gscedata_INCLUDED) =
  () =
  (#define NUM_LEN_BITS ) print lenbits =
  () =
  (#define N(len,offset) (((offset) << NUM_LEN_BITS) + (len))) =
  (#define N_LEN(e) ((e) & ((1 << NUM_LEN_BITS) - 1))) =
  (#define N_OFFSET(e) ((e) >> NUM_LEN_BITS)) =
  () =
  (extern const char gs_c_known_encoding_chars[];) =
  (extern const int gs_c_known_encoding_total_chars;) =
  (extern const int gs_c_known_encoding_max_length;) =
  (extern const ushort gs_c_known_encoding_offsets[];) =
  (extern const int gs_c_known_encoding_count;) =
  (extern const ushort *const gs_c_known_encodings[];) =
  (extern const ushort *const gs_c_known_encodings_reverse[];) =
  (extern const ushort gs_c_known_encoding_lengths[];) =
  (extern const ushort gs_c_known_encoding_reverse_lengths[];) =
  () =
  (#endif /* gscedata_INCLUDED */) =
} def

% ================ Write data file ================ %

% Free variables: encnames, encodings, estrs, maxlen.
/writedata {
  /reverse_lengths encnames length array def

  (#include "stdpre.h") =
  (#include "gstypes.h") =
  (#include "gscedata.h") =

        % Write the name strings, sorted by increasing length, and
        % alphabetically increasing within the same length.
  (
const char gs_c_known_encoding_chars[] = {) =
  1 1 maxlen {
    /len exch def
    /noff 0 def
        % Collect and sort names of this length.
    [ estrs {
      pop dup length len ne { pop } { .namestring } ifelse
    } forall ] /lt load .sort
        % Output the names.
    {
      dup {
        (') print (x) dup 0 4 -1 roll put print (',) print
      } forall
      (  /*N\() print len =only (,) print noff =only (\)*/) =
      estrs exch get noff ne {
        (Different offsets in 1st and 2nd pass) =
      } if
      /noff noff len add def
    } forall
  } for
  (0};) =
(
const int gs_c_known_encoding_total_chars = ) print
  offset =only (;) =

        % Write the starting offsets of the names of each length.
  /numchars 0 estrs { pop length add } forall def
  (
const int gs_c_known_encoding_max_length = ) print
  maxlen =only (;) =
  (
const ushort gs_c_known_encoding_offsets[] = {) =
  0 1 maxlen {
    lbase exch get =only (,) print
  } for
  numchars =only (};) =

        % Write the encodings themselves.
  (
const int gs_c_known_encoding_count = ) print
  encodings length =only (;) =
  /i 0 def
  encodings {
    () =
    (/* ) print encnames i get =only ( */) =
    (static const ushort gs_c_known_encoding_) print i =only ([] = {) =
    /e exch def
    e {
      (N\() print dup length =only (,) print
      estrs 1 index get =only (\),  /*) print .namestring print (*/) =
    } forall (0};) =

    (static const ushort gs_c_known_encoding_reverse_) print i =only ([] = {) =
    [
    /code 0 def
    e {
      dup /.notdef eq {
        pop
      } {
        [ exch estrs 1 index get lenbits bitshift 1 index length add code ] %[/name N code]
      } ifelse
      /code code 1 add def
    } forall
    ]
    reverse_lengths i 2 index length put
    {1 get exch 1 get exch lt} .sort {
      aload pop
      =only
      pop
      (,   /* N\() print dup length =only (,) print
      estrs 1 index get =only (\): ) print .namestring print (*/) =
    } forall (0};) =

  /i i 1 add def
  } forall

        % Write the table of pointers to the encodings.
  (
const ushort *const gs_c_known_encodings[] = {) =
  0 1 encodings length 1 sub {
    (    gs_c_known_encoding_) print dup =only (, /* ) print
    encnames exch get =only ( */) =
  } for (    0
  };) =

  (const ushort *const gs_c_known_encodings_reverse[] = {) =
  0 1 encodings length 1 sub {
    (    gs_c_known_encoding_reverse_) print dup =only (, /* ) print
    encnames exch get =only ( */) =
  } for (    0
  };) =

        % Write the table of encoding lengths.
  (
const ushort gs_c_known_encoding_lengths[] = {) =
  0 1 encodings length 1 sub {
    encodings exch get length =only (,) print
  } for (0};) =

  (const ushort gs_c_known_encoding_reverse_lengths[] = {) =
  reverse_lengths {
    =only (,) print
  } forall (0};) =

} def

% ========= Write PDF good glyph table ========= %

/calc_glyph_table {

  /N { lenbits bitshift add } bind def

  /enc_mame_to_index <<
    0 encnames {
      exch dup 1 add
    } forall pop
  >> readonly def

  /glyph_type 600 dict begin

  /SymbolEncoding enc_mame_to_index exch get encodings exch get {
    dup length
    exch estrs exch get
    N 1 def
  } forall

  { /StandardEncoding /WinAnsiEncoding /MacExpertEncoding } {
    enc_mame_to_index exch get encodings exch get {
      dup length exch estrs exch get N 3 def
    } forall
  } forall
  currentdict end def

  /max_glyph 0 def

  glyph_type {
    pop max_glyph .max /max_glyph exch def
  } forall

} bind def

/write_glyph_table {
  (#include "gdevpdtv.h") = () =
  calc_glyph_table
  (/*) =
  ( * Glyph attributes for every glyph <= GS_C_PDF_MAX_GOOD_GLYPH) =
  ( * packed 4 per byte least significant bits first.) =
  ( */)=

  (const unsigned char gs_c_pdf_glyph_type[] = {) =
  0 1 max_glyph 4 idiv {
    4 mul
    dup           glyph_type exch .knownget not { 0 } if
    1 index 1 add glyph_type exch .knownget not { 0 } if 2 bitshift or
    1 index 2 add glyph_type exch .knownget not { 0 } if 4 bitshift or
    1 index 3 add glyph_type exch .knownget not { 0 } if 6 bitshift or
    =only
    3 add max_glyph lt { (,) } { () = (};) } ifelse =
  } for

} bind def

/write_glyph_table_header {
  calc_glyph_table

  (#ifndef gdevpdtv_INCLUDED) =
  (#define gdevpdtv_INCLUDED) =
  () =
  (#define GS_C_PDF_MAX_GOOD_GLYPH ) print max_glyph =
  (#define GS_C_PDF_GOOD_GLYPH_MASK 1) =
  (#define GS_C_PDF_GOOD_NON_SYMBOL_MASK 2) =
  () =
  (extern const unsigned char gs_c_pdf_glyph_type[];) =
  () =
  (#endif /* gdevpdtv_INCLUDED */) =
} bind def

% ================ Main program ================ %

% Collect the registered encodings.

/encodings 20 array def
/encfiles [
  [(gs_std_e.ps) (gs_il1_e.ps) (gs_sym_e.ps) (gs_dbt_e.ps)]
  [(gs_wan_e.ps) (gs_mro_e.ps) (gs_mex_e.ps) (gs_mgl_e.ps)]
  [(gs_lgo_e.ps) (gs_lgx_e.ps) (gs_css_e.ps)]
] def
/encnames 11 array def
/encindex null def
/encname null def
4 dict begin
/.registerencoding {
  /encindex 2 index store
  //encodings 3 1 roll readonly put
} bind def
/.defineencoding {
  pop /encname exch store
} bind def
encfiles { { runlibfile encnames encindex encname put } forall } forall
end
/encodings [ encodings { dup null eq { pop } if } forall ] def

% Collect all names referenced from the encodings.
/estrs 1000 dict def
/maxlen 0 def
encodings {
  {
    estrs 1 index null put
    .namestring length maxlen .max /maxlen exch def
  } forall
} forall

% Calculate glyph offset dictionary
/lbase maxlen 1 add array def
lbase 0 0 put
/offset 0 def
1 1 maxlen {
  /len exch def
  lbase len offset put
  /noff 0 def
        % Collect and sort names of this length.
  [ estrs {
  pop dup length len ne { pop } { .namestring } ifelse
  } forall ] /lt load .sort
        % Output the names.
  {
    estrs exch noff put
    /noff noff len add def
  } forall
  /offset offset noff add def
} for
estrs readonly pop

% Compute the division of the glyph number into length and offset.
/lenbits 1 maxlen {
  dup 1 eq { exit } if exch 1 add exch -1 bitshift
} loop pop def



% Write the initial boilerplate.
(/* Copyright (C) 2001-2023 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.,  39 Mesa Street, Suite 108A, San Francisco,) =
(   CA 94129, USA, for further information.) =

(*/) =
(/*) =
( * This file contains substantial parts of toolbin/encs2c.ps,) =
( * which generated the remainder of the file mechanically from) =
encfiles {
  ( * ) print { (  ) print print } forall () =
} forall
( *) =
( * This source file is maintained manually under source code control,) =
( * however its content should be regenerated by using encs2c.ps) =
( * if changes are required.) =
( * You should not manually alter this file! If you regenerate it using) =
( * encs2c.ps you must regenerate all 4 files; base/gscedata.[c|h]) =
( * and devices/vector/gdevpdtv.[c|h]) =
( */) =
() =

<<
  /gscedata.h { writeheader }
  /gscedata.c { writedata }
  /gdevpdtv.h { write_glyph_table_header }
  /gdevpdtv.c { write_glyph_table }
>> O .knownget {
  exec
} {
  (%stderr) (w) file dup dup
  (Don't know how to create ) writestring
  O writestring
  (\n) writestring
} ifelse

quit