Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * hash.c: chained hash tables |
| 3 | * |
| 4 | * Reference: Your favorite introductory book on algorithms |
| 5 | * |
| 6 | * Copyright (C) 2000 Bjorn Reese and Daniel Veillard. |
| 7 | * |
| 8 | * Permission to use, copy, modify, and distribute this software for any |
| 9 | * purpose with or without fee is hereby granted, provided that the above |
| 10 | * copyright notice and this permission notice appear in all copies. |
| 11 | * |
| 12 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 13 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 14 | * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND |
| 15 | * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER. |
| 16 | * |
Bjorn Reese | 70a9da5 | 2001-04-21 16:57:29 +0000 | [diff] [blame] | 17 | * Author: breese@users.sourceforge.net |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
Bjorn Reese | 70a9da5 | 2001-04-21 16:57:29 +0000 | [diff] [blame] | 20 | #include "libxml.h" |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 21 | |
| 22 | #include <string.h> |
| 23 | #include <libxml/hash.h> |
| 24 | #include <libxml/xmlmemory.h> |
| 25 | #include <libxml/parser.h> |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 26 | #include <libxml/xmlerror.h> |
| 27 | |
| 28 | #define MAX_HASH_LEN 8 |
| 29 | |
| 30 | /* #define DEBUG_GROW */ |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 31 | |
| 32 | /* |
| 33 | * A single entry in the hash table |
| 34 | */ |
| 35 | typedef struct _xmlHashEntry xmlHashEntry; |
| 36 | typedef xmlHashEntry *xmlHashEntryPtr; |
| 37 | struct _xmlHashEntry { |
| 38 | struct _xmlHashEntry *next; |
| 39 | xmlChar *name; |
| 40 | xmlChar *name2; |
| 41 | xmlChar *name3; |
| 42 | void *payload; |
| 43 | }; |
| 44 | |
| 45 | /* |
| 46 | * The entire hash table |
| 47 | */ |
| 48 | struct _xmlHashTable { |
| 49 | struct _xmlHashEntry **table; |
| 50 | int size; |
| 51 | int nbElems; |
| 52 | }; |
| 53 | |
| 54 | /* |
| 55 | * xmlHashComputeKey: |
| 56 | * Calculate the hash key |
| 57 | */ |
| 58 | static unsigned long |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 59 | xmlHashComputeKey(xmlHashTablePtr table, const xmlChar *name, |
| 60 | const xmlChar *name2, const xmlChar *name3) { |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 61 | unsigned long value = 0L; |
| 62 | char ch; |
| 63 | |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 64 | if (name != NULL) { |
| 65 | value += 30 * (*name); |
| 66 | while ((ch = *name++) != 0) { |
| 67 | /* value *= 31; */ |
| 68 | value += (unsigned long)ch; |
| 69 | } |
| 70 | } |
| 71 | if (name2 != NULL) { |
| 72 | while ((ch = *name2++) != 0) { |
| 73 | /* value *= 31; */ |
| 74 | value += (unsigned long)ch; |
| 75 | } |
| 76 | } |
| 77 | if (name3 != NULL) { |
| 78 | while ((ch = *name3++) != 0) { |
| 79 | /* value *= 31; */ |
| 80 | value += (unsigned long)ch; |
| 81 | } |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 82 | } |
| 83 | return (value % table->size); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * xmlHashCreate: |
| 88 | * @size: the size of the hash table |
| 89 | * |
| 90 | * Create a new xmlHashTablePtr. |
| 91 | * |
| 92 | * Returns the newly created object, or NULL if an error occured. |
| 93 | */ |
| 94 | xmlHashTablePtr |
| 95 | xmlHashCreate(int size) { |
| 96 | xmlHashTablePtr table; |
| 97 | |
| 98 | if (size <= 0) |
| 99 | size = 256; |
| 100 | |
| 101 | table = xmlMalloc(sizeof(xmlHashTable)); |
| 102 | if (table) { |
| 103 | table->size = size; |
| 104 | table->nbElems = 0; |
| 105 | table->table = xmlMalloc(size * sizeof(xmlHashEntry)); |
| 106 | if (table->table) { |
| 107 | memset(table->table, 0, size * sizeof(xmlHashEntry)); |
| 108 | return(table); |
| 109 | } |
| 110 | xmlFree(table); |
| 111 | } |
| 112 | return(NULL); |
| 113 | } |
| 114 | |
| 115 | /** |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 116 | * xmlHashGrow: |
| 117 | * @table: the hash table |
| 118 | * @size: the new size of the hash table |
| 119 | * |
| 120 | * resize the hash table |
| 121 | * |
| 122 | * Returns 0 in case of success, -1 in case of failure |
| 123 | */ |
Daniel Veillard | dab4cb3 | 2001-04-20 13:03:48 +0000 | [diff] [blame] | 124 | static int |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 125 | xmlHashGrow(xmlHashTablePtr table, int size) { |
| 126 | unsigned long key; |
| 127 | int oldsize, i; |
| 128 | xmlHashEntryPtr iter, next; |
| 129 | struct _xmlHashEntry **oldtable; |
| 130 | #ifdef DEBUG_GROW |
| 131 | unsigned long nbElem = 0; |
| 132 | #endif |
| 133 | |
| 134 | if (table == NULL) |
| 135 | return(-1); |
| 136 | if (size < 8) |
| 137 | return(-1); |
| 138 | if (size > 8 * 2048) |
| 139 | return(-1); |
| 140 | |
| 141 | oldsize = table->size; |
| 142 | oldtable = table->table; |
| 143 | if (oldtable == NULL) |
| 144 | return(-1); |
| 145 | |
| 146 | table->table = xmlMalloc(size * sizeof(xmlHashEntry)); |
| 147 | if (table->table == NULL) { |
| 148 | table->table = oldtable; |
| 149 | return(-1); |
| 150 | } |
| 151 | memset(table->table, 0, size * sizeof(xmlHashEntry)); |
| 152 | table->size = size; |
| 153 | |
| 154 | for (i = 0; i < oldsize; i++) { |
| 155 | iter = oldtable[i]; |
| 156 | while (iter) { |
| 157 | next = iter->next; |
| 158 | |
| 159 | /* |
| 160 | * put back the entry in the new table |
| 161 | */ |
| 162 | |
| 163 | key = xmlHashComputeKey(table, iter->name, iter->name2, |
| 164 | iter->name3); |
| 165 | iter->next = table->table[key]; |
| 166 | table->table[key] = iter; |
| 167 | |
| 168 | #ifdef DEBUG_GROW |
| 169 | nbElem++; |
| 170 | #endif |
| 171 | |
| 172 | iter = next; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | xmlFree(oldtable); |
| 177 | |
| 178 | #ifdef DEBUG_GROW |
| 179 | xmlGenericError(xmlGenericErrorContext, |
| 180 | "xmlHashGrow : from %d to %d, %d elems\n", oldsize, size, nbElem); |
| 181 | #endif |
| 182 | |
| 183 | return(0); |
| 184 | } |
| 185 | |
| 186 | /** |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 187 | * xmlHashFree: |
| 188 | * @table: the hash table |
| 189 | * @f: the deallocator function for items in the hash |
| 190 | * |
| 191 | * Free the hash table and its contents. The userdata is |
| 192 | * deallocated with f if provided. |
| 193 | */ |
| 194 | void |
| 195 | xmlHashFree(xmlHashTablePtr table, xmlHashDeallocator f) { |
| 196 | int i; |
| 197 | xmlHashEntryPtr iter; |
| 198 | xmlHashEntryPtr next; |
| 199 | |
| 200 | if (table == NULL) |
| 201 | return; |
| 202 | if (table->table) { |
| 203 | for(i = 0; i < table->size; i++) { |
| 204 | iter = table->table[i]; |
| 205 | while (iter) { |
| 206 | next = iter->next; |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 207 | if (f) |
| 208 | f(iter->payload, iter->name); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 209 | if (iter->name) |
| 210 | xmlFree(iter->name); |
| 211 | if (iter->name2) |
| 212 | xmlFree(iter->name2); |
| 213 | if (iter->name3) |
| 214 | xmlFree(iter->name3); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 215 | iter->payload = NULL; |
| 216 | xmlFree(iter); |
| 217 | iter = next; |
| 218 | } |
| 219 | table->table[i] = NULL; |
| 220 | } |
| 221 | xmlFree(table->table); |
| 222 | } |
| 223 | xmlFree(table); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * xmlHashAddEntry: |
| 228 | * @table: the hash table |
| 229 | * @name: the name of the userdata |
| 230 | * @userdata: a pointer to the userdata |
| 231 | * |
| 232 | * Add the userdata to the hash table. This can later be retrieved |
| 233 | * by using the name. Duplicate names generate errors. |
| 234 | * |
| 235 | * Returns 0 the addition succeeded and -1 in case of error. |
| 236 | */ |
| 237 | int |
| 238 | xmlHashAddEntry(xmlHashTablePtr table, const xmlChar *name, void *userdata) { |
| 239 | return(xmlHashAddEntry3(table, name, NULL, NULL, userdata)); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * xmlHashAddEntry2: |
| 244 | * @table: the hash table |
| 245 | * @name: the name of the userdata |
| 246 | * @name2: a second name of the userdata |
| 247 | * @userdata: a pointer to the userdata |
| 248 | * |
| 249 | * Add the userdata to the hash table. This can later be retrieved |
| 250 | * by using the (name, name2) tuple. Duplicate tuples generate errors. |
| 251 | * |
| 252 | * Returns 0 the addition succeeded and -1 in case of error. |
| 253 | */ |
| 254 | int |
| 255 | xmlHashAddEntry2(xmlHashTablePtr table, const xmlChar *name, |
| 256 | const xmlChar *name2, void *userdata) { |
| 257 | return(xmlHashAddEntry3(table, name, name2, NULL, userdata)); |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * xmlHashUpdateEntry: |
| 262 | * @table: the hash table |
| 263 | * @name: the name of the userdata |
| 264 | * @userdata: a pointer to the userdata |
| 265 | * @f: the deallocator function for replaced item (if any) |
| 266 | * |
| 267 | * Add the userdata to the hash table. This can later be retrieved |
| 268 | * by using the name. Existing entry for this name will be removed |
| 269 | * and freed with @f if found. |
| 270 | * |
| 271 | * Returns 0 the addition succeeded and -1 in case of error. |
| 272 | */ |
| 273 | int |
| 274 | xmlHashUpdateEntry(xmlHashTablePtr table, const xmlChar *name, |
| 275 | void *userdata, xmlHashDeallocator f) { |
| 276 | return(xmlHashUpdateEntry3(table, name, NULL, NULL, userdata, f)); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * xmlHashUpdateEntry2: |
| 281 | * @table: the hash table |
| 282 | * @name: the name of the userdata |
| 283 | * @name2: a second name of the userdata |
| 284 | * @userdata: a pointer to the userdata |
| 285 | * @f: the deallocator function for replaced item (if any) |
| 286 | * |
| 287 | * Add the userdata to the hash table. This can later be retrieved |
| 288 | * by using the (name, name2) tuple. Existing entry for this tuple will |
| 289 | * be removed and freed with @f if found. |
| 290 | * |
| 291 | * Returns 0 the addition succeeded and -1 in case of error. |
| 292 | */ |
| 293 | int |
| 294 | xmlHashUpdateEntry2(xmlHashTablePtr table, const xmlChar *name, |
| 295 | const xmlChar *name2, void *userdata, |
| 296 | xmlHashDeallocator f) { |
| 297 | return(xmlHashUpdateEntry3(table, name, name2, NULL, userdata, f)); |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * xmlHashLookup: |
| 302 | * @table: the hash table |
| 303 | * @name: the name of the userdata |
| 304 | * |
| 305 | * Find the userdata specified by the name. |
| 306 | * |
| 307 | * Returns the a pointer to the userdata |
| 308 | */ |
| 309 | void * |
| 310 | xmlHashLookup(xmlHashTablePtr table, const xmlChar *name) { |
| 311 | return(xmlHashLookup3(table, name, NULL, NULL)); |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * xmlHashLookup2: |
| 316 | * @table: the hash table |
| 317 | * @name: the name of the userdata |
| 318 | * @name2: a second name of the userdata |
| 319 | * |
| 320 | * Find the userdata specified by the (name, name2) tuple. |
| 321 | * |
| 322 | * Returns the a pointer to the userdata |
| 323 | */ |
| 324 | void * |
| 325 | xmlHashLookup2(xmlHashTablePtr table, const xmlChar *name, |
| 326 | const xmlChar *name2) { |
| 327 | return(xmlHashLookup3(table, name, name2, NULL)); |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * xmlHashAddEntry3: |
| 332 | * @table: the hash table |
| 333 | * @name: the name of the userdata |
| 334 | * @name2: a second name of the userdata |
| 335 | * @name3: a third name of the userdata |
| 336 | * @userdata: a pointer to the userdata |
| 337 | * |
| 338 | * Add the userdata to the hash table. This can later be retrieved |
| 339 | * by using the tuple (name, name2, name3). Duplicate entries generate |
| 340 | * errors. |
| 341 | * |
| 342 | * Returns 0 the addition succeeded and -1 in case of error. |
| 343 | */ |
| 344 | int |
| 345 | xmlHashAddEntry3(xmlHashTablePtr table, const xmlChar *name, |
| 346 | const xmlChar *name2, const xmlChar *name3, |
| 347 | void *userdata) { |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 348 | unsigned long key, len = 0; |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 349 | xmlHashEntryPtr entry; |
| 350 | xmlHashEntryPtr insert; |
| 351 | |
| 352 | if ((table == NULL) || name == NULL) |
| 353 | return(-1); |
| 354 | |
| 355 | /* |
| 356 | * Check for duplicate and insertion location. |
| 357 | */ |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 358 | key = xmlHashComputeKey(table, name, name2, name3); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 359 | if (table->table[key] == NULL) { |
| 360 | insert = NULL; |
| 361 | } else { |
| 362 | for (insert = table->table[key]; insert->next != NULL; |
| 363 | insert = insert->next) { |
| 364 | if ((xmlStrEqual(insert->name, name)) && |
| 365 | (xmlStrEqual(insert->name2, name2)) && |
| 366 | (xmlStrEqual(insert->name3, name3))) |
| 367 | return(-1); |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 368 | len++; |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 369 | } |
| 370 | if ((xmlStrEqual(insert->name, name)) && |
| 371 | (xmlStrEqual(insert->name2, name2)) && |
| 372 | (xmlStrEqual(insert->name3, name3))) |
| 373 | return(-1); |
| 374 | } |
| 375 | |
| 376 | entry = xmlMalloc(sizeof(xmlHashEntry)); |
| 377 | if (entry == NULL) |
| 378 | return(-1); |
| 379 | entry->name = xmlStrdup(name); |
| 380 | entry->name2 = xmlStrdup(name2); |
| 381 | entry->name3 = xmlStrdup(name3); |
| 382 | entry->payload = userdata; |
| 383 | entry->next = NULL; |
| 384 | |
| 385 | |
| 386 | if (insert == NULL) { |
| 387 | table->table[key] = entry; |
| 388 | } else { |
| 389 | insert->next = entry; |
| 390 | } |
| 391 | table->nbElems++; |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 392 | |
| 393 | if (len > MAX_HASH_LEN) |
| 394 | xmlHashGrow(table, MAX_HASH_LEN * table->size); |
| 395 | |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 396 | return(0); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * xmlHashUpdateEntry3: |
| 401 | * @table: the hash table |
| 402 | * @name: the name of the userdata |
| 403 | * @name2: a second name of the userdata |
| 404 | * @name3: a third name of the userdata |
| 405 | * @userdata: a pointer to the userdata |
| 406 | * @f: the deallocator function for replaced item (if any) |
| 407 | * |
| 408 | * Add the userdata to the hash table. This can later be retrieved |
| 409 | * by using the tuple (name, name2, name3). Existing entry for this tuple |
| 410 | * will be removed and freed with @f if found. |
| 411 | * |
| 412 | * Returns 0 the addition succeeded and -1 in case of error. |
| 413 | */ |
| 414 | int |
| 415 | xmlHashUpdateEntry3(xmlHashTablePtr table, const xmlChar *name, |
| 416 | const xmlChar *name2, const xmlChar *name3, |
| 417 | void *userdata, xmlHashDeallocator f) { |
| 418 | unsigned long key; |
| 419 | xmlHashEntryPtr entry; |
| 420 | xmlHashEntryPtr insert; |
| 421 | |
| 422 | if ((table == NULL) || name == NULL) |
| 423 | return(-1); |
| 424 | |
| 425 | /* |
| 426 | * Check for duplicate and insertion location. |
| 427 | */ |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 428 | key = xmlHashComputeKey(table, name, name2, name3); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 429 | if (table->table[key] == NULL) { |
| 430 | insert = NULL; |
| 431 | } else { |
| 432 | for (insert = table->table[key]; insert->next != NULL; |
| 433 | insert = insert->next) { |
| 434 | if ((xmlStrEqual(insert->name, name)) && |
| 435 | (xmlStrEqual(insert->name2, name2)) && |
| 436 | (xmlStrEqual(insert->name3, name3))) { |
| 437 | if (f) |
| 438 | f(insert->payload, insert->name); |
| 439 | insert->payload = userdata; |
| 440 | return(0); |
| 441 | } |
| 442 | } |
| 443 | if ((xmlStrEqual(insert->name, name)) && |
| 444 | (xmlStrEqual(insert->name2, name2)) && |
| 445 | (xmlStrEqual(insert->name3, name3))) { |
| 446 | if (f) |
| 447 | f(insert->payload, insert->name); |
| 448 | insert->payload = userdata; |
| 449 | return(0); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | entry = xmlMalloc(sizeof(xmlHashEntry)); |
| 454 | if (entry == NULL) |
| 455 | return(-1); |
| 456 | entry->name = xmlStrdup(name); |
| 457 | entry->name2 = xmlStrdup(name2); |
| 458 | entry->name3 = xmlStrdup(name3); |
| 459 | entry->payload = userdata; |
| 460 | entry->next = NULL; |
| 461 | table->nbElems++; |
| 462 | |
| 463 | |
| 464 | if (insert == NULL) { |
| 465 | table->table[key] = entry; |
| 466 | } else { |
| 467 | insert->next = entry; |
| 468 | } |
| 469 | return(0); |
| 470 | } |
| 471 | |
| 472 | /** |
| 473 | * xmlHashLookup: |
| 474 | * @table: the hash table |
| 475 | * @name: the name of the userdata |
| 476 | * @name2: a second name of the userdata |
| 477 | * @name3: a third name of the userdata |
| 478 | * |
| 479 | * Find the userdata specified by the (name, name2, name3) tuple. |
| 480 | * |
| 481 | * Returns the a pointer to the userdata |
| 482 | */ |
| 483 | void * |
| 484 | xmlHashLookup3(xmlHashTablePtr table, const xmlChar *name, |
| 485 | const xmlChar *name2, const xmlChar *name3) { |
| 486 | unsigned long key; |
| 487 | xmlHashEntryPtr entry; |
| 488 | |
| 489 | if (table == NULL) |
| 490 | return(NULL); |
| 491 | if (name == NULL) |
| 492 | return(NULL); |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 493 | key = xmlHashComputeKey(table, name, name2, name3); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 494 | for (entry = table->table[key]; entry != NULL; entry = entry->next) { |
| 495 | if ((xmlStrEqual(entry->name, name)) && |
| 496 | (xmlStrEqual(entry->name2, name2)) && |
| 497 | (xmlStrEqual(entry->name3, name3))) |
| 498 | return(entry->payload); |
| 499 | } |
| 500 | return(NULL); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * xmlHashScan: |
| 505 | * @table: the hash table |
| 506 | * @f: the scanner function for items in the hash |
| 507 | * @data: extra data passed to f |
| 508 | * |
| 509 | * Scan the hash table and applied f to each value. |
| 510 | */ |
| 511 | void |
| 512 | xmlHashScan(xmlHashTablePtr table, xmlHashScanner f, void *data) { |
| 513 | int i; |
| 514 | xmlHashEntryPtr iter; |
| 515 | xmlHashEntryPtr next; |
| 516 | |
| 517 | if (table == NULL) |
| 518 | return; |
| 519 | if (f == NULL) |
| 520 | return; |
| 521 | |
| 522 | if (table->table) { |
| 523 | for(i = 0; i < table->size; i++) { |
| 524 | iter = table->table[i]; |
| 525 | while (iter) { |
| 526 | next = iter->next; |
| 527 | if (f) |
| 528 | f(iter->payload, data, iter->name); |
| 529 | iter = next; |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | /** |
| 536 | * xmlHashScan3: |
| 537 | * @table: the hash table |
| 538 | * @name: the name of the userdata or NULL |
| 539 | * @name2: a second name of the userdata or NULL |
| 540 | * @name3: a third name of the userdata or NULL |
| 541 | * @f: the scanner function for items in the hash |
| 542 | * @data: extra data passed to f |
| 543 | * |
| 544 | * Scan the hash table and applied f to each value matching |
| 545 | * (name, name2, name3) tuple. If one of the names is null, |
| 546 | * the comparison is considered to match. |
| 547 | */ |
| 548 | void |
| 549 | xmlHashScan3(xmlHashTablePtr table, const xmlChar *name, |
| 550 | const xmlChar *name2, const xmlChar *name3, |
| 551 | xmlHashScanner f, void *data) { |
| 552 | int i; |
| 553 | xmlHashEntryPtr iter; |
| 554 | xmlHashEntryPtr next; |
| 555 | |
| 556 | if (table == NULL) |
| 557 | return; |
| 558 | if (f == NULL) |
| 559 | return; |
| 560 | |
| 561 | if (table->table) { |
| 562 | for(i = 0; i < table->size; i++) { |
| 563 | iter = table->table[i]; |
| 564 | while (iter) { |
| 565 | next = iter->next; |
| 566 | if (((name == NULL) || (xmlStrEqual(name, iter->name))) && |
| 567 | ((name2 == NULL) || (xmlStrEqual(name2, iter->name2))) && |
| 568 | ((name3 == NULL) || (xmlStrEqual(name3, iter->name3)))) { |
| 569 | f(iter->payload, data, iter->name); |
| 570 | } |
| 571 | iter = next; |
| 572 | } |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * xmlHashCopy: |
| 579 | * @table: the hash table |
| 580 | * @f: the copier function for items in the hash |
| 581 | * |
| 582 | * Scan the hash table and applied f to each value. |
| 583 | * |
| 584 | * Returns the new table or NULL in case of error. |
| 585 | */ |
| 586 | xmlHashTablePtr |
| 587 | xmlHashCopy(xmlHashTablePtr table, xmlHashCopier f) { |
| 588 | int i; |
| 589 | xmlHashEntryPtr iter; |
| 590 | xmlHashEntryPtr next; |
| 591 | xmlHashTablePtr ret; |
| 592 | |
| 593 | if (table == NULL) |
| 594 | return(NULL); |
| 595 | if (f == NULL) |
| 596 | return(NULL); |
| 597 | |
| 598 | ret = xmlHashCreate(table->size); |
| 599 | if (table->table) { |
| 600 | for(i = 0; i < table->size; i++) { |
| 601 | iter = table->table[i]; |
| 602 | while (iter) { |
| 603 | next = iter->next; |
| 604 | xmlHashAddEntry3(ret, iter->name, iter->name2, |
| 605 | iter->name3, f(iter->payload, iter->name)); |
| 606 | iter = next; |
| 607 | } |
| 608 | } |
| 609 | } |
| 610 | ret->nbElems = table->nbElems; |
| 611 | return(ret); |
| 612 | } |
| 613 | |
| 614 | /** |
| 615 | * xmlHashSize: |
| 616 | * @table: the hash table |
| 617 | * |
| 618 | * Returns the number of elements in the hash table or |
| 619 | * -1 in case of error |
| 620 | */ |
| 621 | int |
| 622 | xmlHashSize(xmlHashTablePtr table) { |
| 623 | if (table == NULL) |
| 624 | return(-1); |
| 625 | return(table->nbElems); |
| 626 | } |
| 627 | |
| 628 | /** |
| 629 | * @table: the hash table |
| 630 | * @name: the name of the userdata |
| 631 | * @f: the deallocator function for removed item (if any) |
| 632 | * |
| 633 | * Find the userdata specified by the (name, name2, name3) tuple and remove |
| 634 | * it from the hash table. Existing userdata for this tuple will be removed |
| 635 | * and freed with @f. |
| 636 | * |
| 637 | * Returns 0 if the removal succeeded and -1 in case of error or not found. |
| 638 | */ |
| 639 | int xmlHashRemoveEntry(xmlHashTablePtr table, const xmlChar *name, |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 640 | xmlHashDeallocator f) { |
| 641 | return(xmlHashRemoveEntry3(table, name, NULL, NULL, f)); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | /** |
| 645 | * @table: the hash table |
| 646 | * @name: the name of the userdata |
| 647 | * @name2: a second name of the userdata |
| 648 | * @f: the deallocator function for removed item (if any) |
| 649 | * |
| 650 | * Find the userdata specified by the (name, name2, name3) tuple and remove |
| 651 | * it from the hash table. Existing userdata for this tuple will be removed |
| 652 | * and freed with @f. |
| 653 | * |
| 654 | * Returns 0 if the removal succeeded and -1 in case of error or not found. |
| 655 | */ |
| 656 | int xmlHashRemoveEntry2(xmlHashTablePtr table, const xmlChar *name, |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 657 | const xmlChar *name2, xmlHashDeallocator f) { |
| 658 | return(xmlHashRemoveEntry3(table, name, name2, NULL, f)); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | /** |
| 662 | * @table: the hash table |
| 663 | * @name: the name of the userdata |
| 664 | * @name2: a second name of the userdata |
| 665 | * @name3: a third name of the userdata |
| 666 | * @f: the deallocator function for removed item (if any) |
| 667 | * |
| 668 | * Find the userdata specified by the (name, name2, name3) tuple and remove |
| 669 | * it from the hash table. Existing userdata for this tuple will be removed |
| 670 | * and freed with @f. |
| 671 | * |
| 672 | * Returns 0 if the removal succeeded and -1 in case of error or not found. |
| 673 | */ |
| 674 | int xmlHashRemoveEntry3(xmlHashTablePtr table, const xmlChar *name, |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 675 | const xmlChar *name2, const xmlChar *name3, xmlHashDeallocator f) { |
| 676 | unsigned long key; |
| 677 | xmlHashEntryPtr entry; |
| 678 | xmlHashEntryPtr prev = NULL; |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 679 | |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 680 | if (table == NULL || name == NULL) |
| 681 | return(-1); |
Owen Taylor | 3473f88 | 2001-02-23 17:55:21 +0000 | [diff] [blame] | 682 | |
Daniel Veillard | a10efa8 | 2001-04-18 13:09:01 +0000 | [diff] [blame] | 683 | key = xmlHashComputeKey(table, name, name2, name3); |
| 684 | if (table->table[key] == NULL) { |
| 685 | return(-1); |
| 686 | } else { |
| 687 | for (entry = table->table[key]; entry != NULL; entry = entry->next) { |
| 688 | if (xmlStrEqual(entry->name, name) && |
| 689 | xmlStrEqual(entry->name2, name2) && |
| 690 | xmlStrEqual(entry->name3, name3)) { |
| 691 | if(f) |
| 692 | f(entry->payload, entry->name); |
| 693 | entry->payload = NULL; |
| 694 | if(entry->name) |
| 695 | xmlFree(entry->name); |
| 696 | if(entry->name2) |
| 697 | xmlFree(entry->name2); |
| 698 | if(entry->name3) |
| 699 | xmlFree(entry->name3); |
| 700 | if(prev) |
| 701 | prev->next = entry->next; |
| 702 | else |
| 703 | table->table[key] = entry->next; |
| 704 | xmlFree(entry); |
| 705 | table->nbElems--; |
| 706 | return(0); |
| 707 | } |
| 708 | prev = entry; |
| 709 | } |
| 710 | return(-1); |
| 711 | } |
Daniel Veillard | 9e7160d | 2001-03-18 23:17:47 +0000 | [diff] [blame] | 712 | } |
| 713 | |