2 * Copyright (C) 1994-1999, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.29 1999-06-30 09:08:23 adam
8 * Added coder to reset.
10 * Revision 1.28 1999/05/26 07:49:13 adam
13 * Revision 1.27 1999/05/12 13:08:06 adam
14 * First version of ISAMS.
16 * Revision 1.26 1999/02/02 14:50:54 adam
17 * Updated WIN32 code specific sections. Changed header.
19 * Revision 1.25 1998/06/08 15:26:06 adam
22 * Revision 1.24 1998/06/08 14:43:12 adam
23 * Added suport for EXPLAIN Proxy servers - added settings databasePath
24 * and explainDatabase to facilitate this. Increased maximum number
25 * of databases and attributes in one register.
27 * Revision 1.23 1998/03/05 08:45:12 adam
28 * New result set model and modular ranking system. Moved towards
29 * descent server API. System information stored as "SGML" records.
31 * Revision 1.22 1997/09/22 12:39:06 adam
32 * Added get_pos method for the ranked result sets.
34 * Revision 1.21 1997/09/17 12:19:13 adam
35 * Zebra version corresponds to YAZ version 1.4.
36 * Changed Zebra server so that it doesn't depend on global common_resource.
38 * Revision 1.20 1996/12/23 15:30:44 adam
40 * Bug fix: result sets weren't deleted after server shut down.
42 * Revision 1.19 1996/12/11 12:08:00 adam
43 * Added better compression.
45 * Revision 1.18 1996/10/29 14:09:44 adam
46 * Use of cisam system - enabled if setting isamc is 1.
48 * Revision 1.17 1996/06/04 10:18:58 adam
49 * Minor changes - removed include of ctype.h.
51 * Revision 1.16 1996/05/13 14:23:05 adam
52 * Work on compaction of set/use bytes in dictionary.
54 * Revision 1.15 1995/11/20 16:59:46 adam
55 * New update method: the 'old' keys are saved for each records.
57 * Revision 1.14 1995/10/30 15:08:08 adam
60 * Revision 1.13 1995/10/27 14:00:11 adam
61 * Implemented detection of database availability.
63 * Revision 1.12 1995/10/17 18:02:08 adam
64 * New feature: databases. Implemented as prefix to words in dictionary.
66 * Revision 1.11 1995/10/06 16:33:37 adam
67 * Use attribute mappings.
69 * Revision 1.10 1995/09/29 14:01:41 adam
72 * Revision 1.9 1995/09/28 12:10:32 adam
73 * Bug fixes. Field prefix used in queries.
75 * Revision 1.8 1995/09/28 09:19:42 adam
76 * xfree/xmalloc used everywhere.
77 * Extract/retrieve method seems to work for text records.
79 * Revision 1.7 1995/09/27 12:22:28 adam
80 * More work on extract in record control.
81 * Field name is not in isam keys but in prefix in dictionary words.
83 * Revision 1.6 1995/09/14 07:48:23 adam
84 * Record control management.
86 * Revision 1.5 1995/09/11 13:09:34 adam
87 * More work on relevance feedback.
89 * Revision 1.4 1995/09/08 14:52:27 adam
90 * Minor changes. Dictionary is lower case now.
92 * Revision 1.3 1995/09/07 13:58:36 adam
93 * New parameter: result-set file descriptor (RSFD) to support multiple
94 * positions within the same result-set.
95 * Boolean operators: and, or, not implemented.
96 * Result-set references.
98 * Revision 1.2 1995/09/06 16:11:17 adam
99 * Option: only one word key per file.
101 * Revision 1.1 1995/09/04 09:10:36 adam
102 * More work on index add/del/update.
103 * Merge sort implemented.
104 * Initial work on z39 server.
115 void key_logdump (int logmask, const void *p)
119 memcpy (&key, p, sizeof(key));
120 logf (logmask, "%7d s=%-4d", key.sysno, key.seqno);
123 int key_compare_it (const void *p1, const void *p2)
125 if (((struct it_key *) p1)->sysno != ((struct it_key *) p2)->sysno)
127 if (((struct it_key *) p1)->sysno > ((struct it_key *) p2)->sysno)
132 if (((struct it_key *) p1)->seqno != ((struct it_key *) p2)->seqno)
134 if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno)
142 int key_compare (const void *p1, const void *p2)
144 struct it_key i1, i2;
145 memcpy (&i1, p1, sizeof(i1));
146 memcpy (&i2, p2, sizeof(i2));
147 if (i1.sysno != i2.sysno)
149 if (i1.sysno > i2.sysno)
154 if (i1.seqno != i2.seqno)
156 if (i1.seqno > i2.seqno)
164 int key_qsort_compare (const void *p1, const void *p2)
168 char *cp1 = *(char **) p1;
169 char *cp2 = *(char **) p2;
171 if ((r = strcmp (cp1, cp2)))
174 if ((r = key_compare (cp1+l+1, cp2+l+1)))
176 return cp1[l] - cp2[l];
179 int key_get_pos (const void *p)
182 memcpy (&key, p, sizeof(key));
186 struct iscz1_code_info {
190 static void *iscz1_code_start (int mode)
192 struct iscz1_code_info *p = (struct iscz1_code_info *)
193 xmalloc (sizeof(*p));
199 static void iscz1_code_reset (void *vp)
201 struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
206 static void iscz1_code_stop (int mode, void *p)
211 void iscz1_encode_int (unsigned d, char **dst)
213 unsigned char *bp = (unsigned char*) *dst;
222 else if (d <= 4194303)
224 *bp++ = 128 + (d>>16);
225 *bp++ = (d>>8) & 255;
230 *bp++ = 192 + (d>>24);
231 *bp++ = (d>>16) & 255;
232 *bp++ = (d>>8) & 255;
238 int iscz1_decode_int (unsigned char **src)
240 unsigned c = *(*src)++;
246 return ((c & 63) << 8) + *(*src)++;
248 c = ((c & 63) << 8) + *(*src)++;
249 c = (c << 8) + *(*src)++;
252 c = ((c & 63) << 8) + *(*src)++;
253 c = (c << 8) + *(*src)++;
254 c = (c << 8) + *(*src)++;
258 static void iscz1_code_item (int mode, void *vp, char **dst, char **src)
260 struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
264 if (mode == ISAMC_ENCODE)
266 memcpy (&tkey, *src, sizeof(struct it_key));
267 d = tkey.sysno - p->key.sysno;
270 iscz1_encode_int (2*tkey.seqno + 1, dst);
271 iscz1_encode_int (d, dst);
273 p->key.seqno = tkey.seqno;
277 iscz1_encode_int (2*(tkey.seqno - p->key.seqno), dst);
278 p->key.seqno = tkey.seqno;
280 (*src) += sizeof(struct it_key);
284 d = iscz1_decode_int ((unsigned char **) src);
288 p->key.sysno += iscz1_decode_int ((unsigned char **) src);
291 p->key.seqno += d>>1;
292 memcpy (*dst, &p->key, sizeof(struct it_key));
293 (*dst) += sizeof(struct it_key);
297 ISAMC_M key_isamc_m (Res res)
299 static ISAMC_M me = NULL;
304 me = isc_getmethod ();
306 me->compare_item = key_compare;
308 me->code_start = iscz1_code_start;
309 me->code_item = iscz1_code_item;
310 me->code_stop = iscz1_code_stop;
311 me->code_reset = iscz1_code_reset;
313 me->debug = atoi(res_get_def (res, "isamcDebug", "0"));
318 ISAMS_M key_isams_m (Res res)
320 static ISAMS_M me = NULL;
325 me = isams_getmethod ();
327 me->compare_item = key_compare;
329 me->code_start = iscz1_code_start;
330 me->code_item = iscz1_code_item;
331 me->code_stop = iscz1_code_stop;
333 me->debug = atoi(res_get_def (res, "isamsDebug", "0"));
339 int key_SU_code (int ch, char *out)
345 out[i] = 128 + (ch & 63);