1 /* $FreeBSD: head/lib/libc/iconv/citrus_db_factory.c 267437 2014-06-13 08:28:51Z tijl $ */
2 /* $NetBSD: citrus_db_factory.c,v 1.10 2013/09/14 13:05:51 joerg Exp $ */
3
4 /*-
5 * Copyright (c)2003 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/queue.h>
33
34 #include <arpa/inet.h>
35 #include <assert.h>
36 #include <errno.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include "citrus_namespace.h"
42 #include "citrus_region.h"
43 #include "citrus_db_file.h"
44 #include "citrus_db_factory.h"
45
46 struct _citrus_db_factory_entry {
47 STAILQ_ENTRY(_citrus_db_factory_entry) de_entry;
48 struct _citrus_db_factory_entry *de_next;
49 uint32_t de_hashvalue;
50 struct _region de_key;
51 int de_key_free;
52 struct _region de_data;
53 int de_data_free;
54 int de_idx;
55 };
56
57 struct _citrus_db_factory {
58 size_t df_num_entries;
59 STAILQ_HEAD(, _citrus_db_factory_entry) df_entries;
60 size_t df_total_key_size;
61 size_t df_total_data_size;
62 uint32_t (*df_hashfunc)(struct _citrus_region *);
63 void *df_hashfunc_closure;
64 };
65
66 #define DB_ALIGN 16
67
68 int
_citrus_db_factory_create(struct _citrus_db_factory ** rdf,_citrus_db_hash_func_t hashfunc,void * hashfunc_closure)69 _citrus_db_factory_create(struct _citrus_db_factory **rdf,
70 _citrus_db_hash_func_t hashfunc, void *hashfunc_closure)
71 {
72 struct _citrus_db_factory *df;
73
74 df = malloc(sizeof(*df));
75 if (df == NULL)
76 return (errno);
77 df->df_num_entries = 0;
78 df->df_total_key_size = df->df_total_data_size = 0;
79 STAILQ_INIT(&df->df_entries);
80 df->df_hashfunc = hashfunc;
81 df->df_hashfunc_closure = hashfunc_closure;
82
83 *rdf = df;
84
85 return (0);
86 }
87
88 void
_citrus_db_factory_free(struct _citrus_db_factory * df)89 _citrus_db_factory_free(struct _citrus_db_factory *df)
90 {
91 struct _citrus_db_factory_entry *de;
92
93 while ((de = STAILQ_FIRST(&df->df_entries)) != NULL) {
94 STAILQ_REMOVE_HEAD(&df->df_entries, de_entry);
95 if (de->de_key_free)
96 free(_region_head(&de->de_key));
97 if (de->de_data_free)
98 free(_region_head(&de->de_data));
99 free(de);
100 }
101 free(df);
102 }
103
104 static __inline size_t
ceilto(size_t sz)105 ceilto(size_t sz)
106 {
107 return roundup2(sz, DB_ALIGN);
108 }
109
110 int
_citrus_db_factory_add(struct _citrus_db_factory * df,struct _region * key,int keyfree,struct _region * data,int datafree)111 _citrus_db_factory_add(struct _citrus_db_factory *df, struct _region *key,
112 int keyfree, struct _region *data, int datafree)
113 {
114 struct _citrus_db_factory_entry *de;
115
116 de = malloc(sizeof(*de));
117 if (de == NULL)
118 return (-1);
119
120 de->de_hashvalue = df->df_hashfunc(key);
121 de->de_key = *key;
122 de->de_key_free = keyfree;
123 de->de_data = *data;
124 de->de_data_free = datafree;
125 de->de_idx = -1;
126
127 STAILQ_INSERT_TAIL(&df->df_entries, de, de_entry);
128 df->df_total_key_size += _region_size(key);
129 df->df_total_data_size += ceilto(_region_size(data));
130 df->df_num_entries++;
131
132 return (0);
133
134 }
135
136 int
_citrus_db_factory_add_by_string(struct _citrus_db_factory * df,const char * key,struct _citrus_region * data,int datafree)137 _citrus_db_factory_add_by_string(struct _citrus_db_factory *df,
138 const char *key, struct _citrus_region *data, int datafree)
139 {
140 struct _region r;
141 char *tmp;
142
143 tmp = strdup(key);
144 if (tmp == NULL)
145 return (errno);
146 _region_init(&r, tmp, strlen(key));
147 return _citrus_db_factory_add(df, &r, 1, data, datafree);
148 }
149
150 int
_citrus_db_factory_add8_by_string(struct _citrus_db_factory * df,const char * key,uint8_t val)151 _citrus_db_factory_add8_by_string(struct _citrus_db_factory *df,
152 const char *key, uint8_t val)
153 {
154 struct _region r;
155 uint8_t *p;
156
157 p = malloc(sizeof(*p));
158 if (p == NULL)
159 return (errno);
160 *p = val;
161 _region_init(&r, p, 1);
162 return (_citrus_db_factory_add_by_string(df, key, &r, 1));
163 }
164
165 int
_citrus_db_factory_add16_by_string(struct _citrus_db_factory * df,const char * key,uint16_t val)166 _citrus_db_factory_add16_by_string(struct _citrus_db_factory *df,
167 const char *key, uint16_t val)
168 {
169 struct _region r;
170 uint16_t *p;
171
172 p = malloc(sizeof(*p));
173 if (p == NULL)
174 return (errno);
175 *p = htons(val);
176 _region_init(&r, p, 2);
177 return (_citrus_db_factory_add_by_string(df, key, &r, 1));
178 }
179
180 int
_citrus_db_factory_add32_by_string(struct _citrus_db_factory * df,const char * key,uint32_t val)181 _citrus_db_factory_add32_by_string(struct _citrus_db_factory *df,
182 const char *key, uint32_t val)
183 {
184 struct _region r;
185 uint32_t *p;
186
187 p = malloc(sizeof(*p));
188 if (p == NULL)
189 return (errno);
190 *p = htonl(val);
191 _region_init(&r, p, 4);
192 return (_citrus_db_factory_add_by_string(df, key, &r, 1));
193 }
194
195 int
_citrus_db_factory_add_string_by_string(struct _citrus_db_factory * df,const char * key,const char * data)196 _citrus_db_factory_add_string_by_string(struct _citrus_db_factory *df,
197 const char *key, const char *data)
198 {
199 char *p;
200 struct _region r;
201
202 p = strdup(data);
203 if (p == NULL)
204 return (errno);
205 _region_init(&r, p, strlen(p) + 1);
206 return (_citrus_db_factory_add_by_string(df, key, &r, 1));
207 }
208
209 size_t
_citrus_db_factory_calc_size(struct _citrus_db_factory * df)210 _citrus_db_factory_calc_size(struct _citrus_db_factory *df)
211 {
212 size_t sz;
213
214 sz = ceilto(_CITRUS_DB_HEADER_SIZE);
215 sz += ceilto(_CITRUS_DB_ENTRY_SIZE * df->df_num_entries);
216 sz += ceilto(df->df_total_key_size);
217 sz += df->df_total_data_size;
218
219 return (sz);
220 }
221
222 static __inline void
put8(struct _region * r,size_t * rofs,uint8_t val)223 put8(struct _region *r, size_t *rofs, uint8_t val)
224 {
225
226 *(uint8_t *)_region_offset(r, *rofs) = val;
227 *rofs += 1;
228 }
229
230 static __inline void
put32(struct _region * r,size_t * rofs,uint32_t val)231 put32(struct _region *r, size_t *rofs, uint32_t val)
232 {
233
234 val = htonl(val);
235 memcpy(_region_offset(r, *rofs), &val, 4);
236 *rofs += 4;
237 }
238
239 static __inline void
putpad(struct _region * r,size_t * rofs)240 putpad(struct _region *r, size_t *rofs)
241 {
242 size_t i;
243
244 for (i = ceilto(*rofs) - *rofs; i > 0; i--)
245 put8(r, rofs, 0);
246 }
247
248 static __inline void
dump_header(struct _region * r,const char * magic,size_t * rofs,size_t num_entries)249 dump_header(struct _region *r, const char *magic, size_t *rofs,
250 size_t num_entries)
251 {
252
253 while (*rofs<_CITRUS_DB_MAGIC_SIZE)
254 put8(r, rofs, *magic++);
255 put32(r, rofs, num_entries);
256 put32(r, rofs, _CITRUS_DB_HEADER_SIZE);
257 }
258
259 int
_citrus_db_factory_serialize(struct _citrus_db_factory * df,const char * magic,struct _region * r)260 _citrus_db_factory_serialize(struct _citrus_db_factory *df, const char *magic,
261 struct _region *r)
262 {
263 struct _citrus_db_factory_entry *de, **depp, *det;
264 size_t dataofs, i, keyofs, nextofs, ofs;
265
266 ofs = 0;
267 /* check whether more than 0 entries exist */
268 if (df->df_num_entries == 0) {
269 dump_header(r, magic, &ofs, 0);
270 return (0);
271 }
272 /* allocate hash table */
273 depp = calloc(df->df_num_entries, sizeof(*depp));
274 if (depp == NULL)
275 return (-1);
276
277 /* step1: store the entries which are not conflicting */
278 STAILQ_FOREACH(de, &df->df_entries, de_entry) {
279 de->de_hashvalue %= df->df_num_entries;
280 de->de_idx = -1;
281 de->de_next = NULL;
282 if (depp[de->de_hashvalue] == NULL) {
283 depp[de->de_hashvalue] = de;
284 de->de_idx = (int)de->de_hashvalue;
285 }
286 }
287
288 /* step2: resolve conflicts */
289 i = 0;
290 STAILQ_FOREACH(de, &df->df_entries, de_entry) {
291 if (de->de_idx == -1) {
292 det = depp[de->de_hashvalue];
293 while (det->de_next != NULL)
294 det = det->de_next;
295 det->de_next = de;
296 while (depp[i] != NULL)
297 i++;
298 depp[i] = de;
299 de->de_idx = (int)i;
300 }
301 }
302
303 keyofs = _CITRUS_DB_HEADER_SIZE +
304 ceilto(df->df_num_entries*_CITRUS_DB_ENTRY_SIZE);
305 dataofs = keyofs + ceilto(df->df_total_key_size);
306
307 /* dump header */
308 dump_header(r, magic, &ofs, df->df_num_entries);
309
310 /* dump entries */
311 for (i = 0; i < df->df_num_entries; i++) {
312 de = depp[i];
313 nextofs = 0;
314 if (de->de_next) {
315 nextofs = _CITRUS_DB_HEADER_SIZE +
316 de->de_next->de_idx * _CITRUS_DB_ENTRY_SIZE;
317 }
318 put32(r, &ofs, de->de_hashvalue);
319 put32(r, &ofs, nextofs);
320 put32(r, &ofs, keyofs);
321 put32(r, &ofs, _region_size(&de->de_key));
322 put32(r, &ofs, dataofs);
323 put32(r, &ofs, _region_size(&de->de_data));
324 memcpy(_region_offset(r, keyofs),
325 _region_head(&de->de_key), _region_size(&de->de_key));
326 keyofs += _region_size(&de->de_key);
327 memcpy(_region_offset(r, dataofs),
328 _region_head(&de->de_data), _region_size(&de->de_data));
329 dataofs += _region_size(&de->de_data);
330 putpad(r, &dataofs);
331 }
332 putpad(r, &ofs);
333 putpad(r, &keyofs);
334 free(depp);
335
336 return (0);
337 }
338