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name : gs_frsd.ps
 % Copyright (C) 2001-2019 Artifex Software, Inc.
% 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.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% 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 0 dict} 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 exec
  } {
    //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
                % We must allocate the string in the same VM space as its
                % source, since the reusable stream must be allocated there.

    .currentglobal 1 index gcheck .setglobal exch
    currentpacking //false setpacking exch
                % Stack: dict filters parms CloseSource oldglobal oldpacking file
    [ exch { dup 40000 string readstring not { exit } if exch } loop
      exch pop
    ]
                        % Stack: dict filters parms CloseSource oldglobal oldpacking [()...]
    3 1 roll setpacking setglobal
                        % Stack: dict filters parms CloseSource [()...]
    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
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