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[findutils.git] / locate / locatedb.h
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1 /* locatedb.h -- declarations for the locate database
2 Copyright (C) 1994 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 #ifndef _LOCATEDB_H
19 #define _LOCATEDB_H 1
21 /* The magic string at the start of a locate database, to make sure
22 it's in the right format. The 02 is the database format version number.
23 This string has the same format as a database entry, but you can't
24 concatenate databases even if you remove it, since the differential count
25 in the first entry of the second database will be wrong. */
26 #define LOCATEDB_MAGIC "\0LOCATE02"
28 /* Common-prefix length differences in the ranges
29 0..127, -127..-1 (0x00..0x7f, 0x81..0xff) fit into one byte.
30 This value (which is -128) indicates that the difference is
31 too large to fit into one byte, and a two-byte integer follows. */
32 #define LOCATEDB_ESCAPE 0x80
34 /* These are used for old, bigram-encoded databases: */
36 /* Means the differential count follows in a 2-byte int instead. */
37 #define LOCATEDB_OLD_ESCAPE 30
39 /* Offset added to differential counts to encode them as positive numbers. */
40 #define LOCATEDB_OLD_OFFSET 14
42 #endif /* !_LOCATEDB_H */