X-Git-Url: http://git.indexdata.com/?p=idzebra-moved-to-github.git;a=blobdiff_plain;f=index%2Fkcompare.c;h=1951681c7013fa9d2b3b61c0776500a01320dfea;hp=849d8fa05e3b80549bb0ec8845944e0bcf4d7351;hb=5437b50633032595afe6f87dc0f989bc92a5aea8;hpb=b9093505b17a074e79137ed64595c8269f77d330

diff --git a/index/kcompare.c b/index/kcompare.c
index 849d8fa..1951681 100644
--- a/index/kcompare.c
+++ b/index/kcompare.c
@@ -1,82 +1,24 @@
-/*
- * Copyright (C) 1994-1996, Index Data I/S 
- * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
- *
- * $Log: kcompare.c,v $
- * Revision 1.21  1997-09-17 12:19:13  adam
- * Zebra version corresponds to YAZ version 1.4.
- * Changed Zebra server so that it doesn't depend on global common_resource.
- *
- * Revision 1.20  1996/12/23 15:30:44  adam
- * Work on truncation.
- * Bug fix: result sets weren't deleted after server shut down.
- *
- * Revision 1.19  1996/12/11 12:08:00  adam
- * Added better compression.
- *
- * 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 1.54 2004-11-19 10:26:57 heikki Exp $
+   Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
+   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>
@@ -85,55 +27,95 @@
 
 #include "index.h"
 
-void key_logdump (int logmask, const void *p)
+#ifdef __GNUC__
+#define CODEC_INLINE inline
+#else
+#define CODEC_INLINE
+#endif
+
+void key_logdump_txt (int logmask, const void *p, const char *txt)
 {
     struct it_key key;
+    if (p)
+    {
+	char formstr[128];
+	int i;
 
-    memcpy (&key, p, sizeof(key));
-    logf (logmask, "%7d s=%-4d", key.sysno, key.seqno);
+        memcpy (&key, p, sizeof(key));
+	assert(key.len > 0 && key.len <= IT_KEY_LEVEL_MAX);
+	*formstr = '\0';
+	for (i = 0; i<key.len; i++)
+	{
+	    if (i)
+		strcat(formstr, ".");
+	    sprintf(formstr + strlen(formstr), ZINT_FORMAT, key.mem[i]);
+	}
+        yaz_log (logmask, "%s %s", formstr, txt);
+    }
+    else
+        yaz_log(logmask, " (null) %s",txt);
+}
+
+void key_logdump (int logmask, const void *p)
+{
+    key_logdump_txt(logmask,  p, "");
 }
 
 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)
+    int i, l = ((struct it_key *) p1)->len;
+    if (((struct it_key *) p2)->len > l)
+	l = ((struct it_key *) p2)->len;
+    assert (l <= 4 && l > 0);
+    for (i = 0; i < l; i++)
     {
-        if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno)
-            return 1;
-        else
-            return -1;
+	if (((struct it_key *) p1)->mem[i] != ((struct it_key *) p2)->mem[i])
+	{
+	    if (((struct it_key *) p1)->mem[i] > ((struct it_key *) p2)->mem[i])
+		return l-i;
+	    else
+		return i-l;
+	}
     }
     return 0;
 }
 
+char *key_print_it (const void *p, char *buf)
+{
+    strcpy(buf, "");
+    return buf;
+}
+
 int key_compare (const void *p1, const void *p2)
 {
     struct it_key i1, i2;
+    int i, l;
     memcpy (&i1, p1, sizeof(i1));
     memcpy (&i2, p2, sizeof(i2));
-    if (i1.sysno != i2.sysno)
-    {
-        if (i1.sysno > i2.sysno)
-            return 2;
-        else
-            return -2;
-    }
-    if (i1.seqno != i2.seqno)
+    l = i1.len;
+    if (i2.len > l)
+	l = i2.len;
+    assert (l <= 4 && l > 0);
+    for (i = 0; i < l; i++)
     {
-        if (i1.seqno > i2.seqno)
-            return 1;
-        else
-            return -1;
+	if (i1.mem[i] != i2.mem[i])
+	{
+	    if (i1.mem[i] > i2.mem[i])
+		return l-i;
+	    else
+		return i-l;
+	}
     }
     return 0;
 }
 
+zint key_get_seq(const void *p)
+{
+    struct it_key k;
+    memcpy (&k, p, sizeof(k));
+    return k.mem[k.len-1];
+}
+
 int key_qsort_compare (const void *p1, const void *p2)
 {
     int r;
@@ -153,123 +135,204 @@ struct iscz1_code_info {
     struct it_key key;
 };
 
-static void *iscz1_code_start (int mode)
+void *iscz1_start (void)
 {
-    struct iscz1_code_info *p = xmalloc (sizeof(*p));
-    p->key.sysno = 0;
-    p->key.seqno = 0;
+    struct iscz1_code_info *p = (struct iscz1_code_info *)
+	xmalloc (sizeof(*p));
+    iscz1_reset(p);
     return p;
 }
 
-static void iscz1_code_stop (int mode, void *p)
+void key_init(struct it_key *key)
+{
+    int i;
+    key->len = 0;
+    for (i = 0; i<IT_KEY_LEVEL_MAX; i++)
+	key->mem[i] = 0;
+}
+
+void iscz1_reset (void *vp)
+{
+    struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
+    int i;
+    p->key.len = 0;
+    for (i = 0; i< IT_KEY_LEVEL_MAX; i++)
+	p->key.mem[i] = 0;
+}
+
+void iscz1_stop (void *p)
 {
     xfree (p);
 }
 
-void iscz1_encode_int (unsigned d, char **dst)
+/* small encoder that works with unsigneds of any length */
+static CODEC_INLINE void iscz1_encode_int (zint d, char **dst)
 {
     unsigned char *bp = (unsigned char*) *dst;
 
-    if (d <= 63)
-        *bp++ = d;
-    else if (d <= 16383)
+    while (d > 127)
     {
-        *bp++ = 64 + (d>>8);
-       *bp++ = d & 255;
-    }
-    else if (d <= 4194303)
-    {
-        *bp++ = 128 + (d>>16);
-        *bp++ = (d>>8) & 255;
-        *bp++ = d & 255;
-    }
-    else
-    {
-        *bp++ = 192 + (d>>24);
-        *bp++ = (d>>16) & 255;
-        *bp++ = (d>>8) & 255;
-        *bp++ = d & 255;
+        *bp++ = (unsigned) (128 | (d & 127));
+	d = d >> 7;
     }
+    *bp++ = (unsigned) d;
     *dst = (char *) bp;
 }
 
-int iscz1_decode_int (unsigned char **src)
+/* small decoder that works with unsigneds of any length */
+static CODEC_INLINE zint iscz1_decode_int (unsigned char **src)
 {
-    unsigned c = *(*src)++;
-    switch (c & 192)
+    zint d = 0;
+    unsigned char c;
+    unsigned r = 0;
+
+    while (((c = *(*src)++) & 128))
     {
-    case 0:
-        return c;
-    case 64:
-        return ((c & 63) << 8) + *(*src)++;
-    case 128:
-        c = ((c & 63) << 8) + *(*src)++;
-        c = (c << 8) + *(*src)++;
-        return c;
+        d += ((zint) (c&127) << r);
+	r += 7;
     }
-    c = ((c & 63) << 8) + *(*src)++;
-    c = (c << 8) + *(*src)++;
-    c = (c << 8) + *(*src)++;
-    return c;
+    d += ((zint) c << r);
+    return d;
 }
 
-static void iscz1_code_item (int mode, void *vp, char **dst, char **src)
+void iscz1_encode (void *vp, char **dst, const char **src)
 {
-    struct iscz1_code_info *p = vp;
+    struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
     struct it_key tkey;
-    int d;
+    zint d;
+    int i;
+
+    /*   1
+	 3, 2, 9, 12
+	 3, 2, 10, 2
+	 4, 1
+	 
+	 if diff is 0, then there is more ...
+	 if diff is non-zero, then _may_ be more
+    */
+    memcpy (&tkey, *src, sizeof(struct it_key));
 
-    if (mode == ISAMC_ENCODE)
+    /* deal with leader + delta encoding .. */
+    d = 0;
+    assert(tkey.len > 0 && tkey.len <= 4);
+    for (i = 0; i < tkey.len; i++)
     {
-        memcpy (&tkey, *src, sizeof(struct it_key));
-        d = tkey.sysno - p->key.sysno;
-        if (d)
-        {
-            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;
-        }
-        (*src) += sizeof(struct it_key);
+	d = tkey.mem[i] - p->key.mem[i];
+	if (d || i == tkey.len-1)
+	{  /* all have been equal until now, now make delta .. */
+	    p->key.mem[i] = tkey.mem[i];
+	    if (d > 0)
+	    {
+		iscz1_encode_int (i + (tkey.len << 3) + 64, dst);
+		i++;
+		iscz1_encode_int (d, dst);
+	    }
+	    else
+	    {
+		iscz1_encode_int (i + (tkey.len << 3), dst);
+		}
+	    break;
+	}
     }
-    else
+    /* rest uses absolute encoding ... */
+    for (; i < tkey.len; i++)
     {
-        d = iscz1_decode_int ((unsigned char **) src);
-        if (d & 1)
-        {
-            p->key.seqno = d>>1;
-            p->key.sysno += iscz1_decode_int ((unsigned char **) src);
-        }
-        else
-            p->key.seqno += d>>1;
-        memcpy (*dst, &p->key, sizeof(struct it_key));
-        (*dst) += sizeof(struct it_key);
+	iscz1_encode_int (tkey.mem[i], dst);
+	p->key.mem[i] = tkey.mem[i];
     }
+    (*src) += sizeof(struct it_key);
 }
 
-ISAMC_M key_isamc_m (Res res)
+void iscz1_decode (void *vp, char **dst, const char **src)
 {
-    static ISAMC_M me = NULL;
+    struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
+    int i;
 
-    if (me)
-        return me;
+    int leader = (int) iscz1_decode_int ((unsigned char **) src);
+    i = leader & 7;
+    if (leader & 64)
+	p->key.mem[i] += iscz1_decode_int ((unsigned char **) src);
+    else
+	p->key.mem[i] = iscz1_decode_int ((unsigned char **) src);
+    p->key.len = (leader >> 3) & 7;
+    while (++i < p->key.len)
+	p->key.mem[i] = iscz1_decode_int ((unsigned char **) src);
+    memcpy (*dst, &p->key, sizeof(struct it_key));
+    (*dst) += sizeof(struct it_key);
+}
 
-    me = isc_getmethod ();
+ISAMS_M *key_isams_m (Res res, ISAMS_M *me)
+{
+    isams_getmethod (me);
 
     me->compare_item = key_compare;
+    me->log_item = key_logdump_txt;
 
-    me->code_start = iscz1_code_start;
-    me->code_item = iscz1_code_item;
-    me->code_stop = iscz1_code_stop;
+    me->codec.start = iscz1_start;
+    me->codec.decode = iscz1_decode;
+    me->codec.encode = iscz1_encode;
+    me->codec.stop = iscz1_stop;
+    me->codec.reset = iscz1_reset;
+
+    me->debug = atoi(res_get_def (res, "isamsDebug", "0"));
+
+    return me;
+}
+
+ISAMC_M *key_isamc_m (Res res, ISAMC_M *me)
+{
+    isc_getmethod (me);
+
+    me->compare_item = key_compare;
+    me->log_item = key_logdump_txt;
+
+    me->codec.start = iscz1_start;
+    me->codec.decode = iscz1_decode;
+    me->codec.encode = iscz1_encode;
+    me->codec.stop = iscz1_stop;
+    me->codec.reset = iscz1_reset;
 
     me->debug = atoi(res_get_def (res, "isamcDebug", "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;
+}
+