83 lines
2.9 KiB
PostScript
83 lines
2.9 KiB
PostScript
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% Copyright (C) 2000 Aladdin Enterprises. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: gs_frsd.ps,v 1.9 2005/08/25 15:34:08 ray Exp $
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% Implementation of ReusableStreamDecode filter.
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% This file must be loaded after gs_lev2.ps and gs_res.ps.
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level2dict begin
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% ------ ReusableStreamDecode filter ------ %
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/.reusablestreamdecode { % <source> <dict> .reusablestreamdecode <file>
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% <source> .reusablestreamdecode <file>
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% Collect the filter parameters.
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dup type /dicttype eq { 2 copy } { dup 0 dict } ifelse
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dup .rsdparams
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% Construct the filter pipeline.
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% The very first filter should use the value of CloseSource
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% from the RSD dictionary; all the others should have
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% CloseSource = true.
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% Stack: source dict filters parms
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2 index /CloseSource .knownget not { false } if 5 -1 roll
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% Stack: dict filters parms CloseSource source
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0 1 5 index length 1 sub {
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4 index 1 index get
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% Stack: dict filters parms CloseSource source index filtname
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4 index null eq {
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0 dict
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} {
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4 index 2 index get dup null eq { pop } if
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} ifelse
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3 -1 roll pop exch filter
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exch pop true exch % set CloseSource for further filters
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} for
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% If AsyncRead is true, try to create the filter directly.
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% Stack: dict filters parms CloseSource source
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4 index /AsyncRead .knownget not { false } if {
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1 index { .reusablestream } .internalstopped
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} {
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null true
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} ifelse {
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pop
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% No luck. Read the entire contents of the stream now.
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dup type /filetype ne {
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% Make a stream from a procedure or string data source.
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0 () .subfiledecode
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} if
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10 dict exch {
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% Stack: dict filters parms CloseSource contdict file
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dup 64000 string readstring
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3 index dup length 4 -1 roll put not { exit } if
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} loop pop
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% Concatenate the contents into one big string.
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% Stack: dict filters parms CloseSource contdict
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0 1 index { length exch pop add } forall
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dup 65400 gt { .bytestring } { string } ifelse exch {
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% Stack: dict filters parms CloseSource string index substring
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exch 64000 mul exch 2 index 3 1 roll putinterval
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} forall
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% Now create the stream on the string.
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1 index .reusablestream
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} if
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% We created the stream successfully: clean up.
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4 { exch pop } repeat
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1 index type /dicttype eq { exch pop } if exch pop
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} odef
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filterdict /ReusableStreamDecode /.reusablestreamdecode load put
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end % level2dict
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