2 * Copyright (C) 1994-1998, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.25 1998-06-08 15:26:06 adam
10 * Revision 1.24 1998/06/08 14:43:12 adam
11 * Added suport for EXPLAIN Proxy servers - added settings databasePath
12 * and explainDatabase to facilitate this. Increased maximum number
13 * of databases and attributes in one register.
15 * Revision 1.23 1998/03/05 08:45:12 adam
16 * New result set model and modular ranking system. Moved towards
17 * descent server API. System information stored as "SGML" records.
19 * Revision 1.22 1997/09/22 12:39:06 adam
20 * Added get_pos method for the ranked result sets.
22 * Revision 1.21 1997/09/17 12:19:13 adam
23 * Zebra version corresponds to YAZ version 1.4.
24 * Changed Zebra server so that it doesn't depend on global common_resource.
26 * Revision 1.20 1996/12/23 15:30:44 adam
28 * Bug fix: result sets weren't deleted after server shut down.
30 * Revision 1.19 1996/12/11 12:08:00 adam
31 * Added better compression.
33 * Revision 1.18 1996/10/29 14:09:44 adam
34 * Use of cisam system - enabled if setting isamc is 1.
36 * Revision 1.17 1996/06/04 10:18:58 adam
37 * Minor changes - removed include of ctype.h.
39 * Revision 1.16 1996/05/13 14:23:05 adam
40 * Work on compaction of set/use bytes in dictionary.
42 * Revision 1.15 1995/11/20 16:59:46 adam
43 * New update method: the 'old' keys are saved for each records.
45 * Revision 1.14 1995/10/30 15:08:08 adam
48 * Revision 1.13 1995/10/27 14:00:11 adam
49 * Implemented detection of database availability.
51 * Revision 1.12 1995/10/17 18:02:08 adam
52 * New feature: databases. Implemented as prefix to words in dictionary.
54 * Revision 1.11 1995/10/06 16:33:37 adam
55 * Use attribute mappings.
57 * Revision 1.10 1995/09/29 14:01:41 adam
60 * Revision 1.9 1995/09/28 12:10:32 adam
61 * Bug fixes. Field prefix used in queries.
63 * Revision 1.8 1995/09/28 09:19:42 adam
64 * xfree/xmalloc used everywhere.
65 * Extract/retrieve method seems to work for text records.
67 * Revision 1.7 1995/09/27 12:22:28 adam
68 * More work on extract in record control.
69 * Field name is not in isam keys but in prefix in dictionary words.
71 * Revision 1.6 1995/09/14 07:48:23 adam
72 * Record control management.
74 * Revision 1.5 1995/09/11 13:09:34 adam
75 * More work on relevance feedback.
77 * Revision 1.4 1995/09/08 14:52:27 adam
78 * Minor changes. Dictionary is lower case now.
80 * Revision 1.3 1995/09/07 13:58:36 adam
81 * New parameter: result-set file descriptor (RSFD) to support multiple
82 * positions within the same result-set.
83 * Boolean operators: and, or, not implemented.
84 * Result-set references.
86 * Revision 1.2 1995/09/06 16:11:17 adam
87 * Option: only one word key per file.
89 * Revision 1.1 1995/09/04 09:10:36 adam
90 * More work on index add/del/update.
91 * Merge sort implemented.
92 * Initial work on z39 server.
103 void key_logdump (int logmask, const void *p)
107 memcpy (&key, p, sizeof(key));
108 logf (logmask, "%7d s=%-4d", key.sysno, key.seqno);
111 int key_compare_it (const void *p1, const void *p2)
113 if (((struct it_key *) p1)->sysno != ((struct it_key *) p2)->sysno)
115 if (((struct it_key *) p1)->sysno > ((struct it_key *) p2)->sysno)
120 if (((struct it_key *) p1)->seqno != ((struct it_key *) p2)->seqno)
122 if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno)
130 int key_compare (const void *p1, const void *p2)
132 struct it_key i1, i2;
133 memcpy (&i1, p1, sizeof(i1));
134 memcpy (&i2, p2, sizeof(i2));
135 if (i1.sysno != i2.sysno)
137 if (i1.sysno > i2.sysno)
142 if (i1.seqno != i2.seqno)
144 if (i1.seqno > i2.seqno)
152 int key_qsort_compare (const void *p1, const void *p2)
156 char *cp1 = *(char **) p1;
157 char *cp2 = *(char **) p2;
159 if ((r = strcmp (cp1, cp2)))
162 if ((r = key_compare (cp1+l+1, cp2+l+1)))
164 return cp1[l] - cp2[l];
167 int key_get_pos (const void *p)
170 memcpy (&key, p, sizeof(key));
174 struct iscz1_code_info {
178 static void *iscz1_code_start (int mode)
180 struct iscz1_code_info *p = xmalloc (sizeof(*p));
186 static void iscz1_code_stop (int mode, void *p)
191 void iscz1_encode_int (unsigned d, char **dst)
193 unsigned char *bp = (unsigned char*) *dst;
202 else if (d <= 4194303)
204 *bp++ = 128 + (d>>16);
205 *bp++ = (d>>8) & 255;
210 *bp++ = 192 + (d>>24);
211 *bp++ = (d>>16) & 255;
212 *bp++ = (d>>8) & 255;
218 int iscz1_decode_int (unsigned char **src)
220 unsigned c = *(*src)++;
226 return ((c & 63) << 8) + *(*src)++;
228 c = ((c & 63) << 8) + *(*src)++;
229 c = (c << 8) + *(*src)++;
232 c = ((c & 63) << 8) + *(*src)++;
233 c = (c << 8) + *(*src)++;
234 c = (c << 8) + *(*src)++;
238 static void iscz1_code_item (int mode, void *vp, char **dst, char **src)
240 struct iscz1_code_info *p = vp;
244 if (mode == ISAMC_ENCODE)
246 memcpy (&tkey, *src, sizeof(struct it_key));
247 d = tkey.sysno - p->key.sysno;
250 iscz1_encode_int (2*tkey.seqno + 1, dst);
251 iscz1_encode_int (d, dst);
253 p->key.seqno = tkey.seqno;
257 iscz1_encode_int (2*(tkey.seqno - p->key.seqno), dst);
258 p->key.seqno = tkey.seqno;
260 (*src) += sizeof(struct it_key);
264 d = iscz1_decode_int ((unsigned char **) src);
268 p->key.sysno += iscz1_decode_int ((unsigned char **) src);
271 p->key.seqno += d>>1;
272 memcpy (*dst, &p->key, sizeof(struct it_key));
273 (*dst) += sizeof(struct it_key);
277 ISAMC_M key_isamc_m (Res res)
279 static ISAMC_M me = NULL;
284 me = isc_getmethod ();
286 me->compare_item = key_compare;
288 me->code_start = iscz1_code_start;
289 me->code_item = iscz1_code_item;
290 me->code_stop = iscz1_code_stop;
292 me->debug = atoi(res_get_def (res, "isamcDebug", "0"));
297 int key_SU_code (int ch, char *out)
303 out[i] = 128 + (ch & 63);