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733bb9a054
Run 'make update-copyright'. * lib/regexprops.c (copying): Update the year number manually. * tests/sample-test: Adjust to use the single most recent year. * All other files: Update copyright years via the above make run.
69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
/* locatedb.h -- declarations for the locate database
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Copyright (C) 1994-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef INC_LOCATEDB_H
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# define INC_LOCATEDB_H 1
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/* The magic string at the start of a locate database, to make sure
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it's in the right format. The 02 is the database format version number.
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This string has the same format as a database entry, but you can't
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concatenate databases even if you remove it, since the differential count
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in the first entry of the second database will be wrong. */
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# define LOCATEDB_MAGIC "\0LOCATE02"
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/* Common-prefix length differences in the ranges
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0..127, -127..-1 (0x00..0x7f, 0x81..0xff) fit into one byte.
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This value (which is -128) indicates that the difference is
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too large to fit into one byte, and a two-byte integer follows. */
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# define LOCATEDB_ESCAPE 0x80
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# define LOCATEDB_ONEBYTE_MAX (127)
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# define LOCATEDB_ONEBYTE_MIN (-127)
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/* If it is ever possible to try to encode LOCATEDB_MAGIC as a
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* single-byte offset, then an unfortunate length of common prefix
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* will produce a spurious escape character, desynchronising the data
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* stream. We use a compile-time check in the preprocessor to prevent
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* this.
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*/
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# if LOCATEDB_ESCAPE <= LOCATEDB_ONEBYTE_MAX
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# error "You have a bad combination of LOCATEDB_ESCAPE and LOCATEDB_ONEBYTE_MAX, see above"
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# endif
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/* These are used for old, bigram-encoded databases: */
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/* Means the differential count follows in a 2-byte int instead. */
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# define LOCATEDB_OLD_ESCAPE 30
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/* Offset added to differential counts to encode them as positive numbers. */
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# define LOCATEDB_OLD_OFFSET 14
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typedef enum
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{
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GetwordEndianStateInitial = 0,
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GetwordEndianStateNative = 1,
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GetwordEndianStateSwab = 2
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} GetwordEndianState;
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int getword (FILE *fp, const char *filename,
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size_t maxvalue,
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GetwordEndianState *endian_state_flag);
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# define SLOCATE_DB_MAGIC_LEN 2
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#endif /* !INC_LOCATEDB_H */
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