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% $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
Mini Shell