gs_cmap.ps

GhostScript的源代码

%    Copyright (C) 1995, 1996, 1997 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of Aladdin Ghostscript.
% 
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
% 
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC.  The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License.  Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.

% $Id: gs_cmap.ps $
% ProcSet for implementing CMap resources.
% When this is run, systemdict is still writable.

% NOTE: Rearranged fonts are not implemented yet.

% ---------------- Public operators ---------------- %

% composefont doesn't appear in CMap files -- it's documented in
% the "PostScript Language Reference Manual Supplement".
/composefont {		% <name> <cmap|cmapname> <fonts> composefont <font>
  10 dict begin
    /CMap 2 index dup type /dicttype ne { /CMap findresource } if def
    /Encoding [ 0 1 4 index length 1 sub { } for ] def
    /FDepVector [ 2 index {
      dup type /dicttype ne {
	dup /CIDFont resourcestatus {
	  pop pop /CIDFont findresource
	} {
	  /Font findresource
	} ifelse
      } if
    } forall ] readonly def
    /FMapType 9 def
    /FontMatrix matrix def
    /FontName 3 index def
    /CMap load /WMode .knownget { /WMode exch def } if
    /FontType 0 def
  pop pop currentdict end /Font defineresource
} bind odef

% ---------------- CMap operators ---------------- %

30 dict begin

% Our internal .CodeMaps structure is an array of two arrays: array 0
% is the map for defined characters, array 1 is the map for notdefs.
% Both are multi-level arrays indexed by the successive bytes of the
% character code.  Each value is either a sub-array, null, a character name,
% a CID (an integer), or a character code (expressed as a byte string).
% All of the arrays are read-only after they have been built.
%
% Note that the code in zfcmap.c that constructs the C structures from
% the PostScript structures has intimate knowledge of the above format.

/.getmap { .CodeMaps exch get } bind def
/.putmap { .CodeMaps exch 3 -1 roll put } bind def

% ------ Font-level operators ------ %

/begincmap		% - begincmap -
 { /.CodeMaps [256 array 256 array] def
 } bind def
/endcmap		% - endcmap -
 { /.CodeMaps .CodeMaps .endmap def
   /CodeMap null def		% for .buildcmap
   currentdict end .buildcmap begin
 } bind def

/begincodespacerange	% <count> begincodespacerange -
 { pop mark
 } bind def
/endcodespacerange	% <code_lo> <code_hi> ... endcodespacerange -
 { counttomark 2 idiv
    { .CodeMaps { 3 copy .addcodespacerange pop } forall pop pop
    } repeat pop
 } bind def

/.addcodespacerange	% <code_lo> <code_hi> <map> .addcodespacerange -
 { 2 index length 1 eq
    { 2 { 3 -1 roll 0 get } repeat 1 exch
       { 2 copy 0 put pop } for pop
    }
    { 2 index 0 get 1 3 index 0 get
      6 -2 roll
      2 { 1 1 index length 1 sub getinterval 6 1 roll } repeat
		% Stack: lo hi map lo0 1 hi0
       { 2 copy get null eq { 2 copy 256 array put } if
         4 copy get .addcodespacerange pop
       }
      for pop pop pop
    }
   ifelse
 } bind def
/.endmap		% <map> .endmap <map>
 { dup type /arraytype eq { dup { .endmap exch } forall astore readonly } if
 } bind def

/usecmap		% <CMap_name> usecmap -
 { /CMap findresource
   dup length dict .copydict
   currentdict end exch .copydict begin
 } bind def

% ------ Rearranged font operators ------ %

/beginrearrangedfont	% <font_name> <font*> beginrearrangedfont -
 {	(NOT IMPLEMENTED YET.\n) print flush
 } bind def
/endrearrangedfont	% - endrearrangedfont -
 {	(NOT IMPLEMENTED YET.\n) print flush
 } bind def

/usefont		% <fontID> usefont -
 {	(NOT IMPLEMENTED YET.\n) print flush
 } bind def

/beginusematrix		% <fontID> beginusematrix -
 {	(NOT IMPLEMENTED YET.\n) print flush
 } bind def
/endusematrix		% <matrix> endusematrix -
 {	(NOT IMPLEMENTED YET.\n) print flush
 } bind def

% ------ Character name/code selector operators ------ %

/beginbfchar		% <count> beginbfchar -
 { pop mark
 } bind def
/endbfchar		% <code> <to_code|charname> ... endbfchar
 { 0 .getmap .endmapchar 0 .putmap
 } bind def

/beginbfrange		% <count> beginbfrange -
 { pop mark
 } bind def
/endbfrange		% <code_lo> <code_hi> <to_code|(charname*)> ...
			%   endbfrange -
 { 0 .getmap counttomark 3 idiv { .addbfrange } repeat 0 .putmap pop
 } bind def

/.addbfrange		% <code_lo> <code_hi> <to_code|(charname*)> <map>
			%   .addbfrange <map>
 { 1 index type /stringtype eq
    {  { dup length string copy dup dup length 1 sub 2 copy get 1 add put }
      exch .addmaprange
    }
    { 2 dict begin exch /codes 1 index def 0 get exch
       { codes dup length 1 sub 1 exch getinterval /codes 1 index def
	 dup length 0 gt { 0 get } if
       }
      exch .addmaprange end
    }
   ifelse exch pop
 } bind def

% ------ CID selector operators ------ %

/begincidchar		% <count> begincidchar -
 { pop mark
 } bind def
/endcidchar		% <code> <cid> ... endcidchar -
 { 0 .getmap .endmapchar 0 .putmap
 } bind def

/begincidrange		% <count> begincidrange -
 { pop mark
 } bind def
/endcidrange		% <code_lo> <code_hi> <cid_base> ... endcidrange -
 { 0 .getmap counttomark 3 idiv { { 1 add } exch .addmaprange exch pop } repeat
   0 .putmap pop
 } bind def

/.endmapchar		% -mark- <code> <value> ... <map> .endmapchar -
 { counttomark 2 idiv
    { 2 index 3 1 roll { } exch .addmaprange exch pop
    } repeat exch pop
 } bind def

/.addmaprange		% <code_lo> <code_hi> <value_base> <next_proc> <map>
			%   .addcidrange <value_next> <map>
 {	% We may be updating a (partly) read-only map from another CMap.
	% If so, implement copy-on-write.
   dup wcheck not { dup length array copy } if
   4 index length 1 eq
    { 2 { 5 -1 roll 0 get } repeat 1 exch
       {	% Stack: value proc map code
	 2 copy 5 index put pop
	 3 -1 roll 2 index exec 3 1 roll
       } for
    }
    { 4 index 0 get 1 5 index 0 get
      8 -2 roll
      2 { 1 1 index length 1 sub getinterval 8 1 roll } repeat
		% Stack: lo hi next proc map lo0 1 hi0
       { 6 copy get .addmaprange
		% Stack: lo hi oldnext proc map i next submap
	 exch 6 1 roll 5 -1 roll pop
		% Stack: lo hi next proc map i submap
	 3 copy put pop pop
       }
      for 5 -2 roll pop pop
    }
   ifelse exch pop
 } bind def

% ------ notdef operators ------ %

/beginnotdefchar	% <count> beginnotdefchar -
 { pop mark
 } bind def
/endnotdefchar		% <code> <cid> ... endnotdefchar -
 { counttomark 2 idiv { 1 index exch .addnotdefrange } repeat pop
 } bind def

/beginnotdefrange	% <count> beginnotdefrange -
 { pop mark
 } bind def
/endnotdefrange		% <code_lo> <code_hi> <cid> ... endnotdefrange -
 { counttomark 3 idiv { .addnotdefrange } repeat pop
 } bind def

/.addnotdefrange	% <code_lo> <code_hi> <cid_base> .addnotdefrange -
 { { } 1 .getmap .addmaprange 1 .putmap pop
 } bind def

% ---------------- Resource category definition ---------------- %

currentdict end

languagelevel exch 2 .setlanguagelevel

/CMap /Generic /Category findresource dup length dict .copydict
/Category defineresource pop
	% We might have loaded CID font support already.
/CIDInit /ProcSet 2 copy { findresource } .internalstopped
	% An interior `stopped' might have reset VM allocation to local.
true .setglobal
 { pop pop 3 -1 roll }
 { dup length 4 index length add dict .copydict 4 -1 roll exch .copydict }
ifelse exch defineresource pop

.setlanguagelevel