X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=index%2Fkcompare.c;h=08a895b74fb4d6e0d8b0f487955a8b8039bfd7f1;hb=4761773f2ff08474c71cc3f44cae1642b45834c1;hp=5ffab21aa39f83c889a29ea59ced46d3ade49f23;hpb=d8728143be0a28eb22a93d91c4ba7d3ab6c3f6cb;p=idzebra-moved-to-github.git diff --git a/index/kcompare.c b/index/kcompare.c index 5ffab21..08a895b 100644 --- a/index/kcompare.c +++ b/index/kcompare.c @@ -1,98 +1,348 @@ -/* - * Copyright (C) 1994-1995, Index Data I/S - * All rights reserved. - * Sebastian Hammer, Adam Dickmeiss - * - * $Log: kcompare.c,v $ - * 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 1.45 2004-06-02 12:29:03 adam 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 #include #include -#include #include #include "index.h" -void key_logdump (int logmask, const void *p) +#define INT_CODEC_NEW 0 +#define CODEC_INLINE inline +void key_logdump_txt (int logmask, const void *p, const char *txt) { struct it_key key; + if (p) + { + memcpy (&key, p, sizeof(key)); + logf (logmask, "%7d:%-4d %s", key.sysno, key.seqno,txt); + } + else + logf(logmask, " (null) %s",txt); +} - memcpy (&key, p, sizeof(key)); - logf (logmask, "%7d s=%-4d", key.sysno, key.seqno); +void key_logdump (int logmask, const void *p) +{ + key_logdump_txt(logmask,p,""); } -int key_compare (const void *p1, const void *p2) +int key_compare_it (const void *p1, const void *p2) { - const struct it_key *i1 = p1, *i2 = p2; - if (i1->sysno != i2->sysno) + if (((struct it_key *) p1)->sysno != ((struct it_key *) p2)->sysno) { - if (i1->sysno > i2->sysno) + if (((struct it_key *) p1)->sysno > ((struct it_key *) p2)->sysno) return 2; else return -2; } -#if IT_KEY_HAVE_SEQNO - if (i1->seqno != i2->seqno) + if (((struct it_key *) p1)->seqno != ((struct it_key *) p2)->seqno) { - if (i1->seqno > i2->seqno) + if (((struct it_key *) p1)->seqno > ((struct it_key *) p2)->seqno) return 1; else return -1; } -#else - if (i1->freq != i2->freq) + 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; + memcpy (&i1, p1, sizeof(i1)); + memcpy (&i2, p2, sizeof(i2)); + if (i1.sysno != i2.sysno) { - if (i1->freq > i2->freq) + if (i1.sysno > i2.sysno) + return 2; + else + return -2; + } + if (i1.seqno != i2.seqno) + { + if (i1.seqno > i2.seqno) return 1; else return -1; } -#endif return 0; } -int index_char_cvt (int c) +int key_qsort_compare (const void *p1, const void *p2) +{ + int r; + size_t l; + char *cp1 = *(char **) p1; + char *cp2 = *(char **) p2; + + if ((r = strcmp (cp1, cp2))) + return r; + l = strlen(cp1)+1; + if ((r = key_compare (cp1+l+1, cp2+l+1))) + return r; + return cp1[l] - cp2[l]; +} + +struct iscz1_code_info { + struct it_key key; +}; + + +static void *iscz1_code_start (int mode) +{ + struct iscz1_code_info *p = (struct iscz1_code_info *) + xmalloc (sizeof(*p)); + p->key.sysno = 0; + p->key.seqno = 0; + return 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); +} + +#if INT_CODEC_NEW +static CODEC_INLINE void iscz1_encode_int (unsigned d, char **dst) +{ + unsigned char *bp = (unsigned char*) *dst; + + while (d > 127) + { + *bp++ = 128 | (d & 127); + d = d >> 7; + } + *bp++ = d; + *dst = (char *) bp; +} + +static CODEC_INLINE int iscz1_decode_int (unsigned char **src) +{ + unsigned d = 0; + unsigned char c; + unsigned r = 0; + + while (((c = *(*src)++) & 128)) + { + d += ((c&127) << r); + r += 7; + } + d += (c << r); + return d; +} +#else +/* ! INT_CODEC_NEW */ + +static CODEC_INLINE void iscz1_encode_int (unsigned d, char **dst) { - return tolower (c); + unsigned char *bp = (unsigned char*) *dst; + + if (d <= 63) + *bp++ = d; + else if (d <= 16383) + { + *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; + } + *dst = (char *) bp; } -int index_word_prefix (char *string, int attrSet, int attrUse) +static CODEC_INLINE int iscz1_decode_int (unsigned char **src) { - sprintf (string, "%c%04d", attrSet + '0', attrUse); - return 5; + unsigned c = *(*src)++; + switch (c & 192) + { + case 0: + return c; + case 64: + return ((c & 63) << 8) + *(*src)++; + case 128: + c = ((c & 63) << 8) + *(*src)++; + c = (c << 8) + *(*src)++; + return c; + } + 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; } +#endif + +static void iscz1_code_item (int mode, void *vp, char **dst, char **src) +{ + struct iscz1_code_info *p = (struct iscz1_code_info *) vp; + struct it_key tkey; + int d; + + if (mode == ISAMC_ENCODE) + { + 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); + } + else + { + 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); + } +} + +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->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->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 (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->log_item = key_logdump_txt; + + 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 (res, "isamdDebug", "0")); + + 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; +} +