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gs_epsf.ps
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2000-12-05
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% Copyright (C) 1989, 1996 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_epsf.ps,v 1.2 2000/09/19 18:29:11 lpd Exp $
% Allow the interpreter to recognize MS-DOS EPSF file headers, and skip to
% the PostScript section of the file.
/.runnoepsf /run load def
/.epsfheader <C5D0D3C6> def
/run
{ dup type /filetype ne { (r) file } if
% Check for MS-DOS EPSF file (see Red Book p. 729).
true exch 0 1 3
{ % Stack: true file index
1 index read dup { pop dup .epsfheader 3 index get eq } if
{ pop pop } % if matched, don't need the character
{ % unread characters (wasn't EPSF)
2 index exch unread % unread mismatch character
dup { % loop unreading backwards in .epsfheader
1 sub dup .epsfheader exch get 2 index exch unread
} repeat pop
exch not exch exit % change true to false
}
ifelse
}
for exch % Stack: file true/false
{ % This block is executed if the file is MS-DOS EPSF.
% Build up the little-endian byte offset and length.
2
{ 1 0 4
{ 2 index read not { pop exit } if % if EOF, let error happen
2 index mul add exch 256 mul exch
}
repeat exch pop exch
}
repeat
% Stack: offset length file
% Use flushfile to skip quickly to the start of the
% PostScript section.
dup 4 -1 roll 12 sub () /SubFileDecode filter flushfile
% Now interpret the PostScript.
exch () /SubFileDecode filter cvx .runexec
}
{ .runnoepsf
}
ifelse
} odef