+++ /dev/null
-/* $Id: kcompare.c,v 1.61 2006-08-16 13:16:36 adam Exp $
- Copyright (C) 1995-2006
- 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 this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-*/
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <assert.h>
-
-#include "index.h"
-
-#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 (!txt)
- txt = "(none)";
- if (p)
- {
- char formstr[128];
- int i;
-
- 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, " (no key) %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)
-{
- int i, l = ((struct it_key *) p1)->len;
- if (((struct it_key *) p2)->len > l)
- l = ((struct it_key *) p2)->len;
- assert (l <= IT_KEY_LEVEL_MAX && l > 0);
- for (i = 0; i < l; i++)
- {
- 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));
- l = i1.len;
- if (i2.len > l)
- l = i2.len;
- assert (l <= IT_KEY_LEVEL_MAX && l > 0);
- for (i = 0; i < l; i++)
- {
- 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];
-}
-
-zint key_get_segment(const void *p)
-{
- struct it_key k;
- memcpy (&k, p, sizeof(k));
- return k.mem[k.len-2];
-}
-
-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;
-};
-
-void *iscz1_start (void)
-{
- struct iscz1_code_info *p = (struct iscz1_code_info *)
- xmalloc (sizeof(*p));
- iscz1_reset(p);
- return 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);
-}
-
-/* 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;
-
- while (d > 127)
- {
- *bp++ = (unsigned) (128 | (d & 127));
- d = d >> 7;
- }
- *bp++ = (unsigned) d;
- *dst = (char *) bp;
-}
-
-/* small decoder that works with unsigneds of any length */
-static CODEC_INLINE zint iscz1_decode_int (unsigned char **src)
-{
- zint d = 0;
- unsigned char c;
- unsigned r = 0;
-
- while (((c = *(*src)++) & 128))
- {
- d += ((zint) (c&127) << r);
- r += 7;
- }
- d += ((zint) c << r);
- return d;
-}
-
-void iscz1_encode (void *vp, char **dst, const char **src)
-{
- struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
- struct it_key tkey;
- 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));
-
- /* deal with leader + delta encoding .. */
- d = 0;
- assert(tkey.len > 0 && tkey.len <= IT_KEY_LEVEL_MAX);
- for (i = 0; i < tkey.len; i++)
- {
- 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;
- }
- }
- /* rest uses absolute encoding ... */
- for (; i < tkey.len; i++)
- {
- iscz1_encode_int (tkey.mem[i], dst);
- p->key.mem[i] = tkey.mem[i];
- }
- (*src) += sizeof(struct it_key);
-}
-
-void iscz1_decode (void *vp, char **dst, const char **src)
-{
- struct iscz1_code_info *p = (struct iscz1_code_info *) vp;
- int i;
-
- 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);
-}
-
-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->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)
-{
- isamc_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"));
-
- 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;
-}
-
-/*
- * Local variables:
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- * vim: shiftwidth=4 tabstop=8 expandtab
- */
-
projects / idzebra-moved-to-github.git / blobdiff