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/*
* This file is part of the sn package.
* Distribution of sn is covered by the GNU GPL. See file COPYING.
* Copyright 1998-2000 Harold Tay.
* Copyright 2000- Patrik Rdman.
*/
#ifndef DHASH_H
#define DHASH_H
/* Relative to snroot, current directory */
#ifndef DH_TABLEFILE
#define DH_TABLEFILE ".table"
#endif
#ifndef DH_CHAINFILE
#define DH_CHAINFILE ".chain"
#endif
#ifndef DH_GROUPFILE
#define DH_GROUPFILE ".newsgroup"
#endif
/*
* Size (static) of the hash table. This is the number of possible
* hash chains.
*/
#ifndef DH_SIZE
#error "DH_SIZE not defined"
#endif
struct data {
char *messageid;
char *newsgroup;
int serial;
};
/*
* Functions return 0 on success, -1 on error. For dh_find()
* dp is in/out param, on entry must contain valid messageid.
* On return, newsgroup and serial are filled in. For dh_delete(),
* only dp->messageid is used. All returned values are readonly.
*/
extern int dh_open (char *pre, int readonly);
extern int dh_close (void);
extern int dh_insert (struct data *dp);
extern int dh_find (struct data *dp);
extern int dh_delete (struct data *dp);
/* Stuff to link in with sndumpdb */
struct chain {
int serial; /* Serial number of the messsage within the ng */
int next; /* offset into database arena */
char newsgroup[2]; /* Newsgroup identifier, from ng_*() */
char messageid[sizeof (int) - 2]; /* Fake size */
};
#define DH_MAGIC 0xd0bed00
#define char2toint(p) ((p[0]<<8)|p[1])
#define char3toint(p) (((p)[0]<<18)|((p)[1]<<10)|((p)[2]<<2))
struct table {
int magic;
unsigned char next[DH_SIZE * 3];
};
extern struct table *dh_table;
#endif
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