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92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* $Id: cdb.h 106 2003-12-12 17:36:49Z werner $
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* public cdb include file
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*
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* This file is a part of tinycdb package by Michael Tokarev, mjt@corpit.ru.
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* Public domain.
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*
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* Taken from tinycdb-0.73. By Werner Koch <wk@gnupg.org> 2003-12-12.
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*/
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#ifndef TINYCDB_VERSION
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#define TINYCDB_VERSION 0.73
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typedef unsigned int cdbi_t; /*XXX should be at least 32 bits long */
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/* common routines */
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cdbi_t cdb_hash(const void *buf, cdbi_t len);
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cdbi_t cdb_unpack(const unsigned char buf[4]);
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void cdb_pack(cdbi_t num, unsigned char buf[4]);
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struct cdb {
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int cdb_fd; /* file descriptor */
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/* private members */
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cdbi_t cdb_fsize; /* datafile size */
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const unsigned char *cdb_mem; /* mmap'ed file memory */
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cdbi_t cdb_vpos, cdb_vlen; /* found data */
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cdbi_t cdb_kpos, cdb_klen; /* found key (only set if cdb_findinit
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was called with KEY set to NULL). */
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};
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#define cdb_datapos(c) ((c)->cdb_vpos)
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#define cdb_datalen(c) ((c)->cdb_vlen)
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#define cdb_keypos(c) ((c)->cdb_kpos)
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#define cdb_keylen(c) ((c)->cdb_klen)
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#define cdb_fileno(c) ((c)->cdb_fd)
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int cdb_init(struct cdb *cdbp, int fd);
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void cdb_free(struct cdb *cdbp);
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int cdb_read(const struct cdb *cdbp,
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void *buf, unsigned len, cdbi_t pos);
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int cdb_find(struct cdb *cdbp, const void *key, unsigned klen);
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struct cdb_find {
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struct cdb *cdb_cdbp;
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cdbi_t cdb_hval;
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const unsigned char *cdb_htp, *cdb_htab, *cdb_htend;
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cdbi_t cdb_httodo;
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const void *cdb_key;
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cdbi_t cdb_klen;
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};
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int cdb_findinit(struct cdb_find *cdbfp, struct cdb *cdbp,
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const void *key, cdbi_t klen);
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int cdb_findnext(struct cdb_find *cdbfp);
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/* old simple interface */
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/* open file using standard routine, then: */
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int cdb_seek(int fd, const void *key, unsigned klen, cdbi_t *dlenp);
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int cdb_bread(int fd, void *buf, int len);
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/* cdb_make */
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struct cdb_make {
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int cdb_fd; /* file descriptor */
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/* private */
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cdbi_t cdb_dpos; /* data position so far */
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cdbi_t cdb_rcnt; /* record count so far */
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char cdb_buf[4096]; /* write buffer */
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char *cdb_bpos; /* current buf position */
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struct cdb_rl *cdb_rec[256]; /* list of arrays of record infos */
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};
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int cdb_make_start(struct cdb_make *cdbmp, int fd);
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int cdb_make_add(struct cdb_make *cdbmp,
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const void *key, cdbi_t klen,
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const void *val, cdbi_t vlen);
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int cdb_make_exists(struct cdb_make *cdbmp,
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const void *key, cdbi_t klen);
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int cdb_make_put(struct cdb_make *cdbmp,
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const void *key, cdbi_t klen,
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const void *val, cdbi_t vlen,
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int flag);
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#define CDB_PUT_ADD 0 /* add unconditionnaly, like cdb_make_add() */
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#define CDB_PUT_REPLACE 1 /* replace: do not place to index OLD record */
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#define CDB_PUT_INSERT 2 /* add only if not already exists */
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#define CDB_PUT_WARN 3 /* add unconditionally but ret. 1 if exists */
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int cdb_make_finish(struct cdb_make *cdbmp);
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#endif /* include guard */
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