% Copyright (C) 1990, 1992 Aladdin Enterprises. All rights reserved.
% Distributed by Free Software Foundation, Inc.
% This file is part of Ghostscript.
% Ghostscript is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
% to anyone for the consequences of using it or for whether it serves any
% particular purpose or works at all, unless he says so in writing. Refer
% to the Ghostscript General Public License for full details.
% Everyone is granted permission to copy, modify and redistribute
% Ghostscript, but only under the conditions described in the Ghostscript
% General Public License. A copy of this license is supposed to have been
% given to you along with Ghostscript so you can know your rights and
% responsibilities. It should be in a file named COPYING. Among other
% things, the copyright notice and this notice must be preserved on all
% Font initialization for Ghostscript.
% Ghostscript fonts have essentially the same contents as Adobe Type 1 fonts,
% except that the external form doesn't use eexec encryption.
% Someday there will be GNU documentation that describes this format.
% Until then, you'll have to either get a copy of Adobe's book, or read
% the Ghostscript code. The interpreter for Type 1 fonts, which reveals
% most of their structure, is in the file gstype1.c.
% Define the default font.
/defaultfontname /Ugly def
% Put an entry into a dictionary, with automatic expansion.
{ 2 index length 3 index maxlength eq
{ 2 index dup length 3 mul 2 idiv 1 add setmaxlength
% Internal procedure to load the font name -> font file name map
% if it isn't loaded already, and push it on the stack.
{ (Fontmap) findlibfile not
{ (Can't find ) print print (!\n) print stop }
FontDirectory maxlength dict exch
{ % The stack contains a mark, the dictionary, the font name,
% the file name, and additional information about the font.
counttomark 3 sub { pop } repeat .xput
pop pop % pop the mark and the copy of the dictionary
userdict exch /FontFileMap exch put
% Ghostscript optionally can load individual CharStrings as they are needed.
% (This is intended primarily for machines with very small memories.)
% This happens if DISKFONTS is true. In this case, we define another
% dictionary parallel to FontDirectory that retains an open file
{ /FontFileDirectory FontDirectory maxlength dict def
% Define definefont. This is a procedure built on an operator that
% does all the error checking and key insertion.
/.buildfont0 where { pop dup 0 /.buildfont0 load put } if
/.buildfont1 where { pop dup 1 /.buildfont1 load put } if
/.buildfont3 where { pop dup 3 /.buildfont3 load put } if
{ 1 dict begin count /d exch def % save stack depth in case of error
{ dup /FontType get .buildfontdict exch get exec
{ FontFileDirectory 2 index known
{ dup /FontFile FontFileDirectory 4 index get put
{ count d sub { pop } repeat end /invalidfont signalerror }
{ end dup FontDirectory 4 2 roll .xput }
% Ghostscript optionally can load individual CharStrings as they are needed.
% (This is intended primarily for machines with very small memories.)
% Initially, the character definition is the file position of the definition;
% this gets replaced with the actual CharString.
% Note that if we are loading characters lazily, CharStrings is writable.
% _Cstring must be long enough to hold the longest CharString for
% a character defined using seac. This is lenIV + 4 * 5 (for the operands
% of sbw, assuming div is not used) + 2 (for sbw) + 3 * 5 (for the operands
% of seac other than the character codes) + 2 * 2 (for the character codes)
% + 2 (for seac), i.e., lenIV + 43.
% When we initially load the font, we call
% <index|charname> <length> /readstring|/readhexstring skip_C
% to skip over each character definition and return the file position instead.
% This substitutes for the procedure
% <length> string currentfile exch read[hex]string pop
% What we actually store is fileposition * 1000 + length,
% negated if the string is stored in binary form.
{ load exch dup 1000 ge 3 index type /nametype ne or
{ % This is a Subrs string, or the string is so long we can't represent
% its length. Load it now.
currentfile 3 1 roll string exch exec pop
{ % Record the position and length, and skip the string.
dup currentfile fileposition 1000 mul add
2 index /readstring load eq { neg } if
{ currentfile _Cstring 3 index exec pop pop
_Cstring length mod _Cstring exch 0 exch getinterval
currentfile exch 3 -1 roll exec pop pop
% Type1BuildChar calls load_C to actually load the character definition.
/load_C % charindex fileposandlength ->
{ exch Encoding exch get exch
/read_C % charname fileposandlength -> charstring
{ dup abs 1000 idiv FontFile exch setfileposition
{ neg 1000 mod string FontFile exch readstring }
{ 1000 mod string FontFile exch readhexstring }
% If the character is defined with seac, load its components now.
{ StandardEncoding exch get dup CharStrings exch get
dup type /integertype eq { read_C } { pop } ifelse pop
/seac_C % charstring -> achar bchar ..or nothing..
{ dup length _Cstring length le
{ 4330 exch _Cstring type1decrypt exch pop
dup dup length 2 sub 2 getinterval <0c06> eq % seac
Private /lenIV known { Private /lenIV get } { 4 } ifelse
exch 1 index sub getinterval
% Parse the string just enough to extract the seac information.
% We assume that the only possible operators are hsbw, sbw, and seac,
% and that there are no 5-byte numbers.
{ 247 sub 256 mul 108 add 1 1 }
{ 251 sub -256 mul -108 add -1 1 }
counttomark 1 add 2 roll cleartomark % pop all but achar bchar
% Define an auxiliary procedure for loading a font.
% - Prevent the CharStrings from being made read-only.
% - Substitute a different CharString-reading procedure.
% If the body of the font is encrypted with eexec, this is disabled,
% because the implicit 'systemdict begin' hides the redefinitions.
% - The magic procedures (-|, -!, |-, and |) are defined with
% executeonly or readonly;
% - The contents of the reading procedures are as defined in bdftops.ps;
% <font> <Private> <CharStrings>
% readonly put noaccess|readonly put
/dict % leave room for FontFile
/executeonly % for reading procedures
/noaccess % for Subrs strings and Private dictionary
/readonly % for procedures and CharStrings dictionary
{ % We want to take the following non-standard actions here:
% - If the operand is the CharStrings dictionary, do nothing;
% - If the operand is a number (a file position replacing the
% actual CharString), do nothing;
% - If the operand is either of the reading procedures (-| or -!),
% substitute a different one.
dup type /dicttype eq % CharStrings or Private
{ 1 index /CharStrings ne { readonly } if }
{ dup type /arraytype eq % procedure or data array
{ dup length 5 eq 1 index xcheck and
1 index 1 get /currentfile eq and
1 index 2 get /exch eq and
1 index 3 get dup /readstring eq exch /readhexstring eq or and
1 index 4 get /pop eq and
{ 3 get cvlit /skip_C cvx 2 packedarray cvx
{ dup type /stringtype eq % must be a Subr string
currentdict end /.loadfontdict exch def
/.loadfont % <file> .loadfont ->
{ mark exch systemdict begin
DISKFONTS { .loadfontdict begin } if
% We can't just use `run', because we want to check for
% .PFB files. We can't save the packing status anywhere,
% so we need two separate control paths.
2 copy unread 16#80 eq { /PFBDecode filter } if
} stopped % split up `execute'
$error /newerror get and {handleerror} if
{ { dup read not { -1 } if
2 copy unread 16#80 eq { /PFBDecode filter } if
% Define findfont so it tries to load a font if it's not found.
% If the key is a string, convert it to a name for lookup.
dup type /stringtype eq { cvn } if
% If the font isn't in FontDirectory already, load it.
dup FontDirectory exch known
{ dup % save the font name on the stack
% Push the font name -> font file name map on the stack,
% loading it if necessary.
% Read the file name from the map.
% (The stack contains the font name and the font file map.)
{ (Substituting ) print defaultfontname cvx =only
( for unknown font ) print == flush
pop defaultfontname findfont
% If we can't find the file, substitute for the font.
FontFileDirectory exch 4 index exch .xput
{ (Loading ) print 2 index =only
( font from ) print exch print (... ) print flush }
{ vmstatus 3 { =only ( ) print } repeat
% Check to make sure the font was actually loaded.
dup FontDirectory exch known
{ (Loading ) print cvx =only
( font failed, substituting )print defaultfontname cvx =only
{ 1 index defaultfontname eq
{ (Can't find default font!\n) print
{ (Can't find font file ) print print
(, substituting ) print defaultfontname cvx =only
pop pop defaultfontname findfont
% The CharStrings for a Ghostscript font are a dictionary in which
% the key is the character name, and the value is a compressed
% representation of a path, as produced by type1imagepath.
% For detailed information, see the book
% "Adobe Type 1 Font Format", published by Adobe Systems Inc.
% Here is the BuildChar implementation
% for Type 1 (Ghostscript standard) fonts.
% The name Type1BuildChar is known to the interpreter.
dup CharStrings exch known not
{ (Substituting .notdef for ) print = flush
currentdict /Metrics known
{ dup Metrics exch get .setmetrics } if
{ 1 setmiterlimit 1 setlinejoin 1 setlinecap
currentdict /StrokeWidth known { StrokeWidth } { 0 } ifelse
dup type /stringtype eq % encoded outline
{ type1addpath pop } % does a fill or stroke
{ dup type /integertype eq % file position for lazy loading
{ currentdict end systemdict begin begin
% Find all the precompiled font operators in systemdict.
{ exch =string cvs (.font_) anchorsearch
{ pop pop exec % execute the operator, returns the font dictionary
Encoding type /stringtype eq
{ Encoding cvn cvx exec /Encoding exch def
% Define a procedure to load all known fonts.
% This isn't likely to be very useful.
{ Fontmap { pop findfont pop } forall