home *** CD-ROM | disk | FTP | other *** search
- /* locatedb.h -- declarations for the locate database
- Copyright (C) 1994 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifndef _LOCATEDB_H
- #define _LOCATEDB_H 1
-
- /* The magic string at the start of a locate database, to make sure
- it's in the right format. The 02 is the database format version number.
- This string has the same format as a database entry, but you can't
- concatenate databases even if you remove it, since the differential count
- in the first entry of the second database will be wrong. */
- #define LOCATEDB_MAGIC "\0LOCATE02"
-
- /* Common-prefix length differences in the ranges
- 0..127, -127..-1 (0x00..0x7f, 0x81..0xff) fit into one byte.
- This value (which is -128) indicates that the difference is
- too large to fit into one byte, and a two-byte integer follows. */
- #define LOCATEDB_ESCAPE 0x80
-
- /* These are used for old, bigram-encoded databases: */
-
- /* Means the differential count follows in a 2-byte int instead. */
- #define LOCATEDB_OLD_ESCAPE 30
-
- /* Offset added to differential counts to encode them as positive numbers. */
- #define LOCATEDB_OLD_OFFSET 14
-
- #endif /* !_LOCATEDB_H */
-