1 /* $FreeBSD: head/lib/libc/iconv/citrus_csmapper.c 252584 2013-07-03 18:35:21Z peter $ */ 2 /* $NetBSD: citrus_csmapper.c,v 1.10 2009/01/11 02:46:24 christos 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/endian.h> 32 #include <sys/types.h> 33 #include <sys/queue.h> 34 35 #include <assert.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <paths.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 #include "citrus_namespace.h" 44 #include "citrus_types.h" 45 #include "citrus_bcs.h" 46 #include "citrus_region.h" 47 #include "citrus_lock.h" 48 #include "citrus_memstream.h" 49 #include "citrus_mmap.h" 50 #include "citrus_module.h" 51 #include "citrus_hash.h" 52 #include "citrus_mapper.h" 53 #include "citrus_csmapper.h" 54 #include "citrus_pivot_file.h" 55 #include "citrus_db.h" 56 #include "citrus_db_hash.h" 57 #include "citrus_lookup.h" 58 59 static struct _citrus_mapper_area *maparea = NULL; 60 61 static pthread_rwlock_t ma_lock = PTHREAD_RWLOCK_INITIALIZER; 62 63 #define CS_ALIAS _PATH_CSMAPPER "/charset.alias" 64 #define CS_PIVOT _PATH_CSMAPPER "/charset.pivot" 65 66 67 /* ---------------------------------------------------------------------- */ 68 69 static int 70 get32(struct _region *r, uint32_t *rval) 71 { 72 73 if (_region_size(r) != 4) 74 return (EFTYPE); 75 76 memcpy(rval, _region_head(r), (size_t)4); 77 *rval = be32toh(*rval); 78 79 return (0); 80 } 81 82 static int 83 open_subdb(struct _citrus_db **subdb, struct _citrus_db *db, const char *src) 84 { 85 struct _region r; 86 int ret; 87 88 ret = _db_lookup_by_s(db, src, &r, NULL); 89 if (ret) 90 return (ret); 91 ret = _db_open(subdb, &r, _CITRUS_PIVOT_SUB_MAGIC, _db_hash_std, NULL); 92 if (ret) 93 return (ret); 94 95 return (0); 96 } 97 98 99 #define NO_SUCH_FILE EOPNOTSUPP 100 static int 101 find_best_pivot_pvdb(const char *src, const char *dst, char *pivot, 102 size_t pvlen, unsigned long *rnorm) 103 { 104 struct _citrus_db *db1, *db2, *db3; 105 struct _region fr, r1, r2; 106 char buf[LINE_MAX]; 107 uint32_t val32; 108 unsigned long norm; 109 int i, num, ret; 110 111 ret = _map_file(&fr, CS_PIVOT ".pvdb"); 112 if (ret) { 113 if (ret == ENOENT) 114 ret = NO_SUCH_FILE; 115 return (ret); 116 } 117 ret = _db_open(&db1, &fr, _CITRUS_PIVOT_MAGIC, _db_hash_std, NULL); 118 if (ret) 119 goto quit1; 120 ret = open_subdb(&db2, db1, src); 121 if (ret) 122 goto quit2; 123 124 num = _db_get_num_entries(db2); 125 *rnorm = ULONG_MAX; 126 for (i = 0; i < num; i++) { 127 /* iterate each pivot */ 128 ret = _db_get_entry(db2, i, &r1, &r2); 129 if (ret) 130 goto quit3; 131 /* r1:pivot name, r2:norm among src and pivot */ 132 ret = get32(&r2, &val32); 133 if (ret) 134 goto quit3; 135 norm = val32; 136 snprintf(buf, sizeof(buf), "%.*s", 137 (int)_region_size(&r1), (char *)_region_head(&r1)); 138 /* buf: pivot name */ 139 ret = open_subdb(&db3, db1, buf); 140 if (ret) 141 goto quit3; 142 if (_db_lookup_by_s(db3, dst, &r2, NULL) != 0) 143 goto quit4; 144 /* r2: norm among pivot and dst */ 145 ret = get32(&r2, &val32); 146 if (ret) 147 goto quit4; 148 norm += val32; 149 /* judge minimum norm */ 150 if (norm < *rnorm) { 151 *rnorm = norm; 152 strlcpy(pivot, buf, pvlen); 153 } 154 quit4: 155 _db_close(db3); 156 if (ret) 157 goto quit3; 158 } 159 quit3: 160 _db_close(db2); 161 quit2: 162 _db_close(db1); 163 quit1: 164 _unmap_file(&fr); 165 if (ret) 166 return (ret); 167 168 if (*rnorm == ULONG_MAX) 169 return (ENOENT); 170 171 return (0); 172 } 173 174 /* ---------------------------------------------------------------------- */ 175 176 struct zone { 177 const char *begin, *end; 178 }; 179 180 struct parse_arg { 181 char dst[PATH_MAX]; 182 unsigned long norm; 183 }; 184 185 static int 186 parse_line(struct parse_arg *pa, struct _region *r) 187 { 188 struct zone z1, z2; 189 char buf[20]; 190 size_t len; 191 192 len = _region_size(r); 193 z1.begin = _bcs_skip_ws_len(_region_head(r), &len); 194 if (len == 0) 195 return (EFTYPE); 196 z1.end = _bcs_skip_nonws_len(z1.begin, &len); 197 if (len == 0) 198 return (EFTYPE); 199 z2.begin = _bcs_skip_ws_len(z1.end, &len); 200 if (len == 0) 201 return (EFTYPE); 202 z2.end = _bcs_skip_nonws_len(z2.begin, &len); 203 204 /* z1 : dst name, z2 : norm */ 205 snprintf(pa->dst, sizeof(pa->dst), 206 "%.*s", (int)(z1.end-z1.begin), z1.begin); 207 snprintf(buf, sizeof(buf), 208 "%.*s", (int)(z2.end-z2.begin), z2.begin); 209 pa->norm = _bcs_strtoul(buf, NULL, 0); 210 211 return (0); 212 } 213 214 static int 215 find_dst(struct parse_arg *pasrc, const char *dst) 216 { 217 struct _lookup *cl; 218 struct parse_arg padst; 219 struct _region data; 220 int ret; 221 222 ret = _lookup_seq_open(&cl, CS_PIVOT, _LOOKUP_CASE_IGNORE); 223 if (ret) 224 return (ret); 225 226 ret = _lookup_seq_lookup(cl, pasrc->dst, &data); 227 while (ret == 0) { 228 ret = parse_line(&padst, &data); 229 if (ret) 230 break; 231 if (strcmp(dst, padst.dst) == 0) { 232 pasrc->norm += padst.norm; 233 break; 234 } 235 ret = _lookup_seq_next(cl, NULL, &data); 236 } 237 _lookup_seq_close(cl); 238 239 return (ret); 240 } 241 242 static int 243 find_best_pivot_lookup(const char *src, const char *dst, char *pivot, 244 size_t pvlen, unsigned long *rnorm) 245 { 246 struct _lookup *cl; 247 struct _region data; 248 struct parse_arg pa; 249 char pivot_min[PATH_MAX]; 250 unsigned long norm_min; 251 int ret; 252 253 ret = _lookup_seq_open(&cl, CS_PIVOT, _LOOKUP_CASE_IGNORE); 254 if (ret) 255 return (ret); 256 257 norm_min = ULONG_MAX; 258 259 /* find pivot code */ 260 ret = _lookup_seq_lookup(cl, src, &data); 261 while (ret == 0) { 262 ret = parse_line(&pa, &data); 263 if (ret) 264 break; 265 ret = find_dst(&pa, dst); 266 if (ret) 267 break; 268 if (pa.norm < norm_min) { 269 norm_min = pa.norm; 270 strlcpy(pivot_min, pa.dst, sizeof(pivot_min)); 271 } 272 ret = _lookup_seq_next(cl, NULL, &data); 273 } 274 _lookup_seq_close(cl); 275 276 if (ret != ENOENT) 277 return (ret); 278 if (norm_min == ULONG_MAX) 279 return (ENOENT); 280 strlcpy(pivot, pivot_min, pvlen); 281 if (rnorm) 282 *rnorm = norm_min; 283 284 return (0); 285 } 286 287 static int 288 find_best_pivot(const char *src, const char *dst, char *pivot, size_t pvlen, 289 unsigned long *rnorm) 290 { 291 int ret; 292 293 ret = find_best_pivot_pvdb(src, dst, pivot, pvlen, rnorm); 294 if (ret == NO_SUCH_FILE) 295 ret = find_best_pivot_lookup(src, dst, pivot, pvlen, rnorm); 296 297 return (ret); 298 } 299 300 static __inline int 301 open_serial_mapper(struct _citrus_mapper_area *__restrict ma, 302 struct _citrus_mapper * __restrict * __restrict rcm, 303 const char *src, const char *pivot, const char *dst) 304 { 305 char buf[PATH_MAX]; 306 307 snprintf(buf, sizeof(buf), "%s/%s,%s/%s", src, pivot, pivot, dst); 308 309 return (_mapper_open_direct(ma, rcm, "mapper_serial", buf)); 310 } 311 312 static struct _citrus_csmapper *csm_none = NULL; 313 static int 314 get_none(struct _citrus_mapper_area *__restrict ma, 315 struct _citrus_csmapper *__restrict *__restrict rcsm) 316 { 317 int ret; 318 319 WLOCK(&ma_lock); 320 if (csm_none) { 321 *rcsm = csm_none; 322 ret = 0; 323 goto quit; 324 } 325 326 ret = _mapper_open_direct(ma, &csm_none, "mapper_none", ""); 327 if (ret) 328 goto quit; 329 _mapper_set_persistent(csm_none); 330 331 *rcsm = csm_none; 332 ret = 0; 333 quit: 334 UNLOCK(&ma_lock); 335 return (ret); 336 } 337 338 int 339 _citrus_csmapper_open(struct _citrus_csmapper * __restrict * __restrict rcsm, 340 const char * __restrict src, const char * __restrict dst, uint32_t flags, 341 unsigned long *rnorm) 342 { 343 const char *realsrc, *realdst; 344 char buf1[PATH_MAX], buf2[PATH_MAX], key[PATH_MAX], pivot[PATH_MAX]; 345 unsigned long norm; 346 int ret; 347 348 norm = 0; 349 350 ret = _citrus_mapper_create_area(&maparea, _PATH_CSMAPPER); 351 if (ret) 352 return (ret); 353 354 realsrc = _lookup_alias(CS_ALIAS, src, buf1, sizeof(buf1), 355 _LOOKUP_CASE_IGNORE); 356 realdst = _lookup_alias(CS_ALIAS, dst, buf2, sizeof(buf2), 357 _LOOKUP_CASE_IGNORE); 358 if (!strcmp(realsrc, realdst)) { 359 ret = get_none(maparea, rcsm); 360 if (ret == 0 && rnorm != NULL) 361 *rnorm = 0; 362 return (ret); 363 } 364 365 snprintf(key, sizeof(key), "%s/%s", realsrc, realdst); 366 367 ret = _mapper_open(maparea, rcsm, key); 368 if (ret == 0) { 369 if (rnorm != NULL) 370 *rnorm = 0; 371 return (0); 372 } 373 if (ret != ENOENT || (flags & _CSMAPPER_F_PREVENT_PIVOT)!=0) 374 return (ret); 375 376 ret = find_best_pivot(realsrc, realdst, pivot, sizeof(pivot), &norm); 377 if (ret) 378 return (ret); 379 380 ret = open_serial_mapper(maparea, rcsm, realsrc, pivot, realdst); 381 if (ret == 0 && rnorm != NULL) 382 *rnorm = norm; 383 384 return (ret); 385 } 386