1 /* $Id: reckeys.c,v 1.10 2006-11-21 22:17:49 adam Exp $
2 Copyright (C) 1995-2006
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 #include <yaz/xmalloc.h>
33 struct zebra_rec_key_entry {
37 struct zebra_rec_key_entry *next;
40 struct zebra_rec_keys_t_ {
51 struct zebra_rec_key_entry **entries;
55 struct zebra_rec_key_entry **zebra_rec_keys_mk_hash(zebra_rec_keys_t p,
58 const struct it_key *key)
64 h = key->mem[key->len-1];
66 for (i = 0; i<len; i++)
67 h = h * 65509 + buf[i];
68 for (j = 0; j<key->len; j++)
69 h = h * 65509 + CAST_ZINT_TO_INT(key->mem[j]);
71 return &p->entries[h % (unsigned) p->hash_size];
74 static void init_hash(zebra_rec_keys_t p)
81 p->entries = nmem_malloc(p->nmem, p->hash_size * sizeof(*p->entries));
82 for (i = 0; i<p->hash_size; i++)
87 zebra_rec_keys_t zebra_rec_keys_open(void)
89 zebra_rec_keys_t p = xmalloc(sizeof(*p));
94 p->owner_of_buffer = 1;
95 p->encode_handle = iscz1_start();
96 p->decode_handle = iscz1_start();
98 p->nmem = nmem_create();
107 void zebra_rec_keys_set_buf(zebra_rec_keys_t p, char *buf, size_t sz,
110 if (p->owner_of_buffer)
124 p->buf = xmalloc(sz);
125 memcpy(p->buf, buf, sz);
128 p->owner_of_buffer = copy_buf;
131 void zebra_rec_keys_get_buf(zebra_rec_keys_t p, char **buf, size_t *sz)
141 void zebra_rec_keys_close(zebra_rec_keys_t p)
146 if (p->owner_of_buffer)
148 if (p->encode_handle)
149 iscz1_stop(p->encode_handle);
150 if (p->decode_handle)
151 iscz1_stop(p->decode_handle);
152 nmem_destroy(p->nmem);
156 int zebra_rec_keys_add_hash(zebra_rec_keys_t keys,
157 const char *str, size_t slen,
158 const struct it_key *key)
160 struct zebra_rec_key_entry **kep_first
161 = zebra_rec_keys_mk_hash(keys, str, slen, key);
162 struct zebra_rec_key_entry **kep = kep_first;
165 struct zebra_rec_key_entry *e = *kep;
166 if (slen == e->len && !memcmp(str, e->buf, slen) &&
167 !key_compare(key, &e->key))
169 *kep = (*kep)->next; /* out of queue */
170 e->next = *kep_first; /* move to front */
177 *kep = nmem_malloc(keys->nmem, sizeof(**kep));
180 memcpy(&(*kep)->key, key, sizeof(*key));
181 (*kep)->buf = nmem_malloc(keys->nmem, slen);
182 memcpy((*kep)->buf, str, slen);
186 void zebra_rec_keys_write(zebra_rec_keys_t keys,
187 const char *str, size_t slen,
188 const struct it_key *key)
191 const char *src = (char*) key;
193 assert(keys->owner_of_buffer);
196 if (!zebra_rec_keys_add_hash(keys, str, slen, key))
199 yaz_log(YLOG_LOG, "dup key slen=%d %.*s "
200 "ord=" ZINT_FORMAT " seq=" ZINT_FORMAT,
201 slen, slen, str, key->mem[0], key->mem[key->len-1]);
203 return; /* key already there . Omit it */
206 if (keys->buf_used+1024 > keys->buf_max)
208 char *b = (char *) xmalloc (keys->buf_max += 128000);
209 if (keys->buf_used > 0)
210 memcpy (b, keys->buf, keys->buf_used);
214 dst = keys->buf + keys->buf_used;
216 iscz1_encode(keys->encode_handle, &dst, &src);
218 memcpy (dst, str, slen);
221 keys->buf_used = dst - keys->buf;
224 void zebra_rec_keys_reset(zebra_rec_keys_t keys)
229 iscz1_reset(keys->encode_handle);
235 int zebra_rec_keys_rewind(zebra_rec_keys_t keys)
238 iscz1_reset(keys->decode_handle);
239 keys->fetch_offset = 0;
240 if (keys->buf_used == 0)
245 int zebra_rec_keys_empty(zebra_rec_keys_t keys)
247 if (keys->buf_used == 0)
252 int zebra_rec_keys_read(zebra_rec_keys_t keys,
253 const char **str, size_t *slen,
257 if (keys->fetch_offset == keys->buf_used)
261 const char *src = keys->buf + keys->fetch_offset;
262 char *dst = (char*) key;
264 assert (keys->fetch_offset < keys->buf_used);
266 /* store the destination key */
267 iscz1_decode(keys->decode_handle, &dst, &src);
269 /* store pointer to string and length of it */
274 keys->fetch_offset = src - keys->buf;
281 * indent-tabs-mode: nil
283 * vim: shiftwidth=4 tabstop=8 expandtab