% 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 { % .reusablestreamdecode % .reusablestreamdecode % 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