ref: 6cb359cc00bdc8204b011db46b8746c446f2c4de
dir: /sys/lib/ghostscript/gs_frsd.ps/
% Copyright (C) 2000 Aladdin Enterprises. 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. % % For more information about licensing, please refer to % http://www.ghostscript.com/licensing/. For information on % commercial licensing, go to http://www.artifex.com/licensing/ or % contact Artifex Software, Inc., 101 Lucas Valley Road #110, % San Rafael, CA 94903, U.S.A., +1(415)492-9861. % $Id: gs_frsd.ps,v 1.9 2005/08/25 15:34:08 ray 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 64000 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 dup 65400 gt { .bytestring } { string } ifelse exch { % Stack: dict filters parms CloseSource string index substring exch 64000 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