-/*
- * Copyright (C) 1994-1996, Index Data I/S
- * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
- *
- * $Log: kcompare.c,v $
- * Revision 1.18 1996-10-29 14:09:44 adam
- * Use of cisam system - enabled if setting isamc is 1.
- *
- * Revision 1.17 1996/06/04 10:18:58 adam
- * Minor changes - removed include of ctype.h.
- *
- * Revision 1.16 1996/05/13 14:23:05 adam
- * Work on compaction of set/use bytes in dictionary.
- *
- * Revision 1.15 1995/11/20 16:59:46 adam
- * New update method: the 'old' keys are saved for each records.
- *
- * Revision 1.14 1995/10/30 15:08:08 adam
- * Bug fixes.
- *
- * Revision 1.13 1995/10/27 14:00:11 adam
- * Implemented detection of database availability.
- *
- * Revision 1.12 1995/10/17 18:02:08 adam
- * New feature: databases. Implemented as prefix to words in dictionary.
- *
- * Revision 1.11 1995/10/06 16:33:37 adam
- * Use attribute mappings.
- *
- * Revision 1.10 1995/09/29 14:01:41 adam
- * Bug fixes.
- *
- * Revision 1.9 1995/09/28 12:10:32 adam
- * Bug fixes. Field prefix used in queries.
- *
- * Revision 1.8 1995/09/28 09:19:42 adam
- * xfree/xmalloc used everywhere.
- * Extract/retrieve method seems to work for text records.
- *
- * Revision 1.7 1995/09/27 12:22:28 adam
- * More work on extract in record control.
- * Field name is not in isam keys but in prefix in dictionary words.
- *
- * Revision 1.6 1995/09/14 07:48:23 adam
- * Record control management.
- *
- * Revision 1.5 1995/09/11 13:09:34 adam
- * More work on relevance feedback.
- *
- * Revision 1.4 1995/09/08 14:52:27 adam
- * Minor changes. Dictionary is lower case now.
- *
- * Revision 1.3 1995/09/07 13:58:36 adam
- * New parameter: result-set file descriptor (RSFD) to support multiple
- * positions within the same result-set.
- * Boolean operators: and, or, not implemented.
- * Result-set references.
- *
- * Revision 1.2 1995/09/06 16:11:17 adam
- * Option: only one word key per file.
- *
- * Revision 1.1 1995/09/04 09:10:36 adam
- * More work on index add/del/update.
- * Merge sort implemented.
- * Initial work on z39 server.
- *
- */
+/* $Id: kcompare.c,v 1.41 2003-06-23 15:35:25 adam Exp $
+ Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003
+ Index Data Aps
+
+This file is part of the Zebra server.
+
+Zebra is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Zebra; see the file LICENSE.zebra. If not, write to the
+Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.
+*/
+
+
+
#include <stdlib.h>
#include <string.h>
logf (logmask, "%7d s=%-4d", key.sysno, key.seqno);
}
+int key_compare_it (const void *p1, const void *p2)
+{
+ if (((struct it_key *) p1)->sysno != ((struct it_key *) p2)->sysno)
+ {
+ if (((struct it_key *) p1)->sysno > ((struct it_key *) p2)->sysno)
+ return 2;
+ else
+ return -2;
+ }
+ if (((struct it_key *) p1)->seqno != ((struct it_key *) p2)->seqno)
+ {
+ if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno)
+ return 1;
+ else
+ return -1;
+ }
+ return 0;
+}
+
+char *key_print_it (const void *p, char *buf)
+{
+ const struct it_key *i = p;
+ sprintf (buf, "%d:%d", i->sysno, i->seqno);
+ return buf;
+}
+
int key_compare (const void *p1, const void *p2)
{
struct it_key i1, i2;
else
return -2;
}
-#if IT_KEY_HAVE_SEQNO
if (i1.seqno != i2.seqno)
{
if (i1.seqno > i2.seqno)
else
return -1;
}
-#else
- if (i1.freq != i2.freq)
- {
- if (i1.freq > i2.freq)
- return 1;
- else
- return -1;
- }
-#endif
return 0;
}
return cp1[l] - cp2[l];
}
-struct iscz_code_info {
+int key_get_pos (const void *p)
+{
+ struct it_key key;
+ memcpy (&key, p, sizeof(key));
+ return key.seqno;
+}
+
+struct iscz1_code_info {
struct it_key key;
};
-static void *iscz_code_start (int mode)
+static void *iscz1_code_start (int mode)
{
- struct iscz_code_info *p = xmalloc (sizeof(*p));
+ struct iscz1_code_info *p = (struct iscz1_code_info *)
+ xmalloc (sizeof(*p));
p->key.sysno = 0;
p->key.seqno = 0;
return p;
}
-static void iscz_code_stop (int mode, void *p)
+static void iscz1_code_reset (void *vp)
+{
+ struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
+ p->key.sysno = 0;
+ p->key.seqno = 0;
+}
+
+static void iscz1_code_stop (int mode, void *p)
{
xfree (p);
}
-void iscz_encode_int (unsigned d, char **dst)
+void iscz1_encode_int (unsigned d, char **dst)
{
unsigned char *bp = (unsigned char*) *dst;
*bp++ = d;
else if (d <= 16383)
{
- *bp++ = 64 + (d>>8);
+ *bp++ = 64 | (d>>8);
*bp++ = d & 255;
}
else if (d <= 4194303)
{
- *bp++ = 128 + (d>>16);
+ *bp++ = 128 | (d>>16);
*bp++ = (d>>8) & 255;
*bp++ = d & 255;
}
else
{
- *bp++ = 192 + (d>>24);
+ *bp++ = 192 | (d>>24);
*bp++ = (d>>16) & 255;
*bp++ = (d>>8) & 255;
*bp++ = d & 255;
*dst = (char *) bp;
}
-int isxz_decode_int (unsigned char **src)
+int iscz1_decode_int (unsigned char **src)
{
unsigned c = *(*src)++;
switch (c & 192)
c = (c << 8) + *(*src)++;
return c;
}
- c = ((c & 63) << 8) + *(*src)++;
+ if (c&32) /* expand sign bit to high bits */
+ c = ((c | 63) << 8) + *(*src)++;
+ else
+ c = ((c & 63) << 8) + *(*src)++;
c = (c << 8) + *(*src)++;
c = (c << 8) + *(*src)++;
+
return c;
}
-static void iscz_code_item (int mode, void *vp, char **dst, char **src)
+static void iscz1_code_item (int mode, void *vp, char **dst, char **src)
{
- struct iscz_code_info *p = vp;
+ struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
struct it_key tkey;
int d;
{
memcpy (&tkey, *src, sizeof(struct it_key));
d = tkey.sysno - p->key.sysno;
- iscz_encode_int (d, dst);
if (d)
{
- p->key.sysno = tkey.sysno;
- p->key.seqno = 0;
+ iscz1_encode_int (2*tkey.seqno + 1, dst);
+ iscz1_encode_int (d, dst);
+ p->key.sysno += d;
+ p->key.seqno = tkey.seqno;
+ }
+ else
+ {
+ iscz1_encode_int (2*(tkey.seqno - p->key.seqno), dst);
+ p->key.seqno = tkey.seqno;
}
- iscz_encode_int (tkey.seqno - p->key.seqno, dst);
- p->key.seqno = tkey.seqno;
(*src) += sizeof(struct it_key);
}
else
{
- d = isxz_decode_int ((unsigned char **) src);
- if (d)
+ d = iscz1_decode_int ((unsigned char **) src);
+ if (d & 1)
{
- p->key.sysno += d;
- p->key.seqno = 0;
+ p->key.seqno = d>>1;
+ p->key.sysno += iscz1_decode_int ((unsigned char **) src);
}
- d = isxz_decode_int ((unsigned char **) src);
- p->key.seqno += d;
+ else
+ p->key.seqno += d>>1;
memcpy (*dst, &p->key, sizeof(struct it_key));
(*dst) += sizeof(struct it_key);
}
}
-ISAMC_M key_isamc_m (void)
+ISAMS_M *key_isams_m (Res res, ISAMS_M *me)
+{
+ isams_getmethod (me);
+
+ me->compare_item = key_compare;
+
+ me->code_start = iscz1_code_start;
+ me->code_item = iscz1_code_item;
+ me->code_stop = iscz1_code_stop;
+
+ me->debug = atoi(res_get_def (res, "isamsDebug", "0"));
+
+ return me;
+}
+
+ISAMC_M *key_isamc_m (Res res, ISAMC_M *me)
{
- static ISAMC_M me = NULL;
+ isc_getmethod (me);
+
+ me->compare_item = key_compare;
- if (me)
- return me;
+ me->code_start = iscz1_code_start;
+ me->code_item = iscz1_code_item;
+ me->code_stop = iscz1_code_stop;
+ me->code_reset = iscz1_code_reset;
- me = isc_getmethod ();
+ me->debug = atoi(res_get_def (res, "isamcDebug", "0"));
+
+ return me;
+}
+
+ISAMD_M *key_isamd_m (Res res, ISAMD_M *me)
+{
+ me = isamd_getmethod (me);
me->compare_item = key_compare;
- me->code_start = iscz_code_start;
- me->code_item = iscz_code_item;
- me->code_stop = iscz_code_stop;
+ me->code_start = iscz1_code_start;
+ me->code_item = iscz1_code_item;
+ me->code_stop = iscz1_code_stop;
+ me->code_reset = iscz1_code_reset;
- me->debug = atoi(res_get_def (common_resource, "isamcDebug", "0"));
+ me->debug = atoi(res_get_def (res, "isamdDebug", "0"));
- logf (LOG_LOG, "ISAMC system active");
return me;
}
+int key_SU_encode (int ch, char *out)
+{
+ int i;
+ for (i = 0; ch; i++)
+ {
+ if (ch >= 64)
+ out[i] = 65 + (ch & 63);
+ else
+ out[i] = 1 + ch;
+ ch = ch >> 6;
+ }
+ return i;
+ /* in out
+ 0 1
+ 1 2
+ 63 64
+ 64 65, 2
+ 65 66, 2
+ 127 128, 2
+ 128 65, 3
+ 191 128, 3
+ 192 65, 4
+ */
+}
+
+int key_SU_decode (int *ch, const unsigned char *out)
+{
+ int len = 1;
+ int fact = 1;
+ *ch = 0;
+ for (len = 1; *out >= 65; len++, out++)
+ {
+ *ch += (*out - 65) * fact;
+ fact <<= 6;
+ }
+ *ch += (*out - 1) * fact;
+ return len;
+}
+