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-% Copyright (C) 2000 Aladdin Enterprises. All rights reserved.
-%
-% This program is free software; you can redistribute it and/or modify it
-% under the terms of the GNU General Public License as published by the
-% Free Software Foundation; either version 2 of the License, or (at your
-% option) any later version.
-%
-% This program is distributed in the hope that it will be useful, but
-% WITHOUT ANY WARRANTY; without even the implied warranty of
-% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-% Public License for more details.
-%
-% You should have received a copy of the GNU General Public License along
-% with this program; if not, write to the Free Software Foundation, Inc.,
-% 59 Temple Place, Suite 330, Boston, MA, 02111-1307.
-
-% $Id: gs_frsd.ps,v 1.4.6.1.2.1 2003/04/12 14:02:38 giles Exp $
-% Implementation of ReusableStreamDecode filter.
-% This file must be loaded after gs_lev2.ps and gs_res.ps.
-
-level2dict begin
-
-% ------ ReusableStreamDecode filter ------ %
-
-/.reusablestreamdecode { % <source> <dict> .reusablestreamdecode <file>
- % <source> .reusablestreamdecode <file>
- % Collect the filter parameters.
- dup type /dicttype eq { 2 copy } { dup 0 dict } ifelse
- dup .rsdparams
- % Construct the filter pipeline.
- % The very first filter should use the value of CloseSource
- % from the RSD dictionary; all the others should have
- % CloseSource = true.
- % Stack: source dict filters parms
- 2 index /CloseSource .knownget not { false } if 5 -1 roll
- % Stack: dict filters parms CloseSource source
- 0 1 5 index length 1 sub {
- 4 index 1 index get
- % Stack: dict filters parms CloseSource source index filtname
- 4 index null eq {
- 0 dict
- } {
- 4 index 2 index get dup null eq { pop } if
- } ifelse
- 3 -1 roll pop exch filter
- exch pop true exch % set CloseSource for further filters
- } for
- % If AsyncRead is true, try to create the filter directly.
- % Stack: dict filters parms CloseSource source
- 4 index /AsyncRead .knownget not { false } if {
- 1 index { .reusablestream } .internalstopped
- } {
- null true
- } ifelse {
- pop
- % No luck. Read the entire contents of the stream now.
- dup type /filetype ne {
- % Make a stream from a procedure or string data source.
- 0 () .subfiledecode
- } if
- 10 dict exch {
- % Stack: dict filters parms CloseSource contdict file
- dup 1000 string readstring
- 3 index dup length 4 -1 roll put not { exit } if
- } loop pop
- % Concatenate the contents into one big string.
- % Stack: dict filters parms CloseSource contdict
- 0 1 index { length exch pop add } forall
- .bigstring exch {
- % Stack: dict filters parms CloseSource string index substring
- exch 1000 mul exch 2 index 3 1 roll putinterval
- } forall
- % Now create the stream on the string.
- 1 index .reusablestream
- } if
- % We created the stream successfully: clean up.
- 4 { exch pop } repeat
- 1 index type /dicttype eq { exch pop } if exch pop
-} odef
-
-filterdict /ReusableStreamDecode /.reusablestreamdecode load put
-
-end % level2dict