2 * Copyright (C) 1994-1996, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.21 1997-09-17 12:19:13 adam
8 * Zebra version corresponds to YAZ version 1.4.
9 * Changed Zebra server so that it doesn't depend on global common_resource.
11 * Revision 1.20 1996/12/23 15:30:44 adam
13 * Bug fix: result sets weren't deleted after server shut down.
15 * Revision 1.19 1996/12/11 12:08:00 adam
16 * Added better compression.
18 * Revision 1.18 1996/10/29 14:09:44 adam
19 * Use of cisam system - enabled if setting isamc is 1.
21 * Revision 1.17 1996/06/04 10:18:58 adam
22 * Minor changes - removed include of ctype.h.
24 * Revision 1.16 1996/05/13 14:23:05 adam
25 * Work on compaction of set/use bytes in dictionary.
27 * Revision 1.15 1995/11/20 16:59:46 adam
28 * New update method: the 'old' keys are saved for each records.
30 * Revision 1.14 1995/10/30 15:08:08 adam
33 * Revision 1.13 1995/10/27 14:00:11 adam
34 * Implemented detection of database availability.
36 * Revision 1.12 1995/10/17 18:02:08 adam
37 * New feature: databases. Implemented as prefix to words in dictionary.
39 * Revision 1.11 1995/10/06 16:33:37 adam
40 * Use attribute mappings.
42 * Revision 1.10 1995/09/29 14:01:41 adam
45 * Revision 1.9 1995/09/28 12:10:32 adam
46 * Bug fixes. Field prefix used in queries.
48 * Revision 1.8 1995/09/28 09:19:42 adam
49 * xfree/xmalloc used everywhere.
50 * Extract/retrieve method seems to work for text records.
52 * Revision 1.7 1995/09/27 12:22:28 adam
53 * More work on extract in record control.
54 * Field name is not in isam keys but in prefix in dictionary words.
56 * Revision 1.6 1995/09/14 07:48:23 adam
57 * Record control management.
59 * Revision 1.5 1995/09/11 13:09:34 adam
60 * More work on relevance feedback.
62 * Revision 1.4 1995/09/08 14:52:27 adam
63 * Minor changes. Dictionary is lower case now.
65 * Revision 1.3 1995/09/07 13:58:36 adam
66 * New parameter: result-set file descriptor (RSFD) to support multiple
67 * positions within the same result-set.
68 * Boolean operators: and, or, not implemented.
69 * Result-set references.
71 * Revision 1.2 1995/09/06 16:11:17 adam
72 * Option: only one word key per file.
74 * Revision 1.1 1995/09/04 09:10:36 adam
75 * More work on index add/del/update.
76 * Merge sort implemented.
77 * Initial work on z39 server.
88 void key_logdump (int logmask, const void *p)
92 memcpy (&key, p, sizeof(key));
93 logf (logmask, "%7d s=%-4d", key.sysno, key.seqno);
96 int key_compare_it (const void *p1, const void *p2)
98 if (((struct it_key *) p1)->sysno != ((struct it_key *) p2)->sysno)
100 if (((struct it_key *) p1)->sysno > ((struct it_key *) p2)->sysno)
105 if (((struct it_key *) p1)->seqno != ((struct it_key *) p2)->seqno)
107 if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno)
115 int key_compare (const void *p1, const void *p2)
117 struct it_key i1, i2;
118 memcpy (&i1, p1, sizeof(i1));
119 memcpy (&i2, p2, sizeof(i2));
120 if (i1.sysno != i2.sysno)
122 if (i1.sysno > i2.sysno)
127 if (i1.seqno != i2.seqno)
129 if (i1.seqno > i2.seqno)
137 int key_qsort_compare (const void *p1, const void *p2)
141 char *cp1 = *(char **) p1;
142 char *cp2 = *(char **) p2;
144 if ((r = strcmp (cp1, cp2)))
147 if ((r = key_compare (cp1+l+1, cp2+l+1)))
149 return cp1[l] - cp2[l];
152 struct iscz1_code_info {
156 static void *iscz1_code_start (int mode)
158 struct iscz1_code_info *p = xmalloc (sizeof(*p));
164 static void iscz1_code_stop (int mode, void *p)
169 void iscz1_encode_int (unsigned d, char **dst)
171 unsigned char *bp = (unsigned char*) *dst;
180 else if (d <= 4194303)
182 *bp++ = 128 + (d>>16);
183 *bp++ = (d>>8) & 255;
188 *bp++ = 192 + (d>>24);
189 *bp++ = (d>>16) & 255;
190 *bp++ = (d>>8) & 255;
196 int iscz1_decode_int (unsigned char **src)
198 unsigned c = *(*src)++;
204 return ((c & 63) << 8) + *(*src)++;
206 c = ((c & 63) << 8) + *(*src)++;
207 c = (c << 8) + *(*src)++;
210 c = ((c & 63) << 8) + *(*src)++;
211 c = (c << 8) + *(*src)++;
212 c = (c << 8) + *(*src)++;
216 static void iscz1_code_item (int mode, void *vp, char **dst, char **src)
218 struct iscz1_code_info *p = vp;
222 if (mode == ISAMC_ENCODE)
224 memcpy (&tkey, *src, sizeof(struct it_key));
225 d = tkey.sysno - p->key.sysno;
228 iscz1_encode_int (2*tkey.seqno + 1, dst);
229 iscz1_encode_int (d, dst);
231 p->key.seqno = tkey.seqno;
235 iscz1_encode_int (2*(tkey.seqno - p->key.seqno), dst);
236 p->key.seqno = tkey.seqno;
238 (*src) += sizeof(struct it_key);
242 d = iscz1_decode_int ((unsigned char **) src);
246 p->key.sysno += iscz1_decode_int ((unsigned char **) src);
249 p->key.seqno += d>>1;
250 memcpy (*dst, &p->key, sizeof(struct it_key));
251 (*dst) += sizeof(struct it_key);
255 ISAMC_M key_isamc_m (Res res)
257 static ISAMC_M me = NULL;
262 me = isc_getmethod ();
264 me->compare_item = key_compare;
266 me->code_start = iscz1_code_start;
267 me->code_item = iscz1_code_item;
268 me->code_stop = iscz1_code_stop;
270 me->debug = atoi(res_get_def (res, "isamcDebug", "0"));
272 logf (LOG_LOG, "ISAMC system active");