/usr/share/doc/jflex/examples/binary/binary.flex is in jflex 1.4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 1998-2009 Gerwin Klein <lsf@jflex.de> *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License. See the file *
* COPYRIGHT for more information. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import java.io.*;
%%
%class BinaryLexer
%8bit
%int
%{
public static void main(String [] argv) {
for (int i = 0; i < argv.length; i++) {
try {
System.out.print("["+argv[i]+"] is ");
BinaryLexer l = new BinaryLexer(new StraightStreamReader(new FileInputStream(argv[i])));
l.yylex();
}
catch (Exception e) {
e.printStackTrace(System.out);
System.exit(1);
}
}
}
%}
magic = \xCA \xFE \xBA \xBE
%%
{magic} [^]+ { System.out.println("a class file"); }
[^]+ { System.out.println("not a class file"); }
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