%    Copyright (C) 2000 Aladdin Enterprises.  All rights reserved.% % This file is part of AFPL Ghostscript.% % AFPL 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 Free Public License (the% "License") for full details.% % Every copy of AFPL 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 AFPL 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_frsd.ps,v 1.4 2000/09/19 18:29:11 lpd 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