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/* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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
# ifndef PARAMS
# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
# define PARAMS(Args) Args
# else
# define PARAMS(Args) ()
# endif
# endif
#endif /* !_LOCATEDB_H */
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