cvs.zerfleddert.de Git - proxmark3-svn/blob - client/jansson/value.c

   1 /*
   2  * Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
   3  *
   4  * Jansson is free software; you can redistribute it and/or modify
   5  * it under the terms of the MIT license. See LICENSE for details.
   6  */
   7
   8 #ifndef _GNU_SOURCE
   9 #define _GNU_SOURCE
  10 #endif
  11
  12 #ifdef HAVE_CONFIG_H
  13 #include <jansson_private_config.h>
  14 #endif
  15
  16 #include <stddef.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <math.h>
  20
  21 #ifdef HAVE_STDINT_H
  22 #include <stdint.h>
  23 #endif
  24
  25 #include "jansson.h"
  26 #include "hashtable.h"
  27 #include "jansson_private.h"
  28 #include "utf.h"
  29
  30 /* Work around nonstandard isnan() and isinf() implementations */
  31 #ifndef isnan
  32 #ifndef __sun
  33 static JSON_INLINE int isnan(double x) { return x != x; }
  34 #endif
  35 #endif
  36 #ifndef isinf
  37 static JSON_INLINE int isinf(double x) { return !isnan(x) && isnan(x - x); }
  38 #endif
  39
  40 static JSON_INLINE void json_init(json_t *json, json_type type)
  41 {
  42     json->type = type;
  43     json->refcount = 1;
  44 }
  45
  46
  47 /*** object ***/
  48
  49 extern volatile uint32_t hashtable_seed;
  50
  51 json_t *json_object(void)
  52 {
  53     json_object_t *object = jsonp_malloc(sizeof(json_object_t));
  54     if(!object)
  55         return NULL;
  56
  57     if (!hashtable_seed) {
  58         /* Autoseed */
  59         json_object_seed(0);
  60     }
  61
  62     json_init(&object->json, JSON_OBJECT);
  63
  64     if(hashtable_init(&object->hashtable))
  65     {
  66         jsonp_free(object);
  67         return NULL;
  68     }
  69
  70     return &object->json;
  71 }
  72
  73 static void json_delete_object(json_object_t *object)
  74 {
  75     hashtable_close(&object->hashtable);
  76     jsonp_free(object);
  77 }
  78
  79 size_t json_object_size(const json_t *json)
  80 {
  81     json_object_t *object;
  82
  83     if(!json_is_object(json))
  84         return 0;
  85
  86     object = json_to_object(json);
  87     return object->hashtable.size;
  88 }
  89
  90 json_t *json_object_get(const json_t *json, const char *key)
  91 {
  92     json_object_t *object;
  93
  94     if(!key || !json_is_object(json))
  95         return NULL;
  96
  97     object = json_to_object(json);
  98     return hashtable_get(&object->hashtable, key);
  99 }
 100
 101 int json_object_set_new_nocheck(json_t *json, const char *key, json_t *value)
 102 {
 103     json_object_t *object;
 104
 105     if(!value)
 106         return -1;
 107
 108     if(!key || !json_is_object(json) || json == value)
 109     {
 110         json_decref(value);
 111         return -1;
 112     }
 113     object = json_to_object(json);
 114
 115     if(hashtable_set(&object->hashtable, key, value))
 116     {
 117         json_decref(value);
 118         return -1;
 119     }
 120
 121     return 0;
 122 }
 123
 124 int json_object_set_new(json_t *json, const char *key, json_t *value)
 125 {
 126     if(!key || !utf8_check_string(key, strlen(key)))
 127     {
 128         json_decref(value);
 129         return -1;
 130     }
 131
 132     return json_object_set_new_nocheck(json, key, value);
 133 }
 134
 135 int json_object_del(json_t *json, const char *key)
 136 {
 137     json_object_t *object;
 138
 139     if(!key || !json_is_object(json))
 140         return -1;
 141
 142     object = json_to_object(json);
 143     return hashtable_del(&object->hashtable, key);
 144 }
 145
 146 int json_object_clear(json_t *json)
 147 {
 148     json_object_t *object;
 149
 150     if(!json_is_object(json))
 151         return -1;
 152
 153     object = json_to_object(json);
 154     hashtable_clear(&object->hashtable);
 155
 156     return 0;
 157 }
 158
 159 int json_object_update(json_t *object, json_t *other)
 160 {
 161     const char *key;
 162     json_t *value;
 163
 164     if(!json_is_object(object) || !json_is_object(other))
 165         return -1;
 166
 167     json_object_foreach(other, key, value) {
 168         if(json_object_set_nocheck(object, key, value))
 169             return -1;
 170     }
 171
 172     return 0;
 173 }
 174
 175 int json_object_update_existing(json_t *object, json_t *other)
 176 {
 177     const char *key;
 178     json_t *value;
 179
 180     if(!json_is_object(object) || !json_is_object(other))
 181         return -1;
 182
 183     json_object_foreach(other, key, value) {
 184         if(json_object_get(object, key))
 185             json_object_set_nocheck(object, key, value);
 186     }
 187
 188     return 0;
 189 }
 190
 191 int json_object_update_missing(json_t *object, json_t *other)
 192 {
 193     const char *key;
 194     json_t *value;
 195
 196     if(!json_is_object(object) || !json_is_object(other))
 197         return -1;
 198
 199     json_object_foreach(other, key, value) {
 200         if(!json_object_get(object, key))
 201             json_object_set_nocheck(object, key, value);
 202     }
 203
 204     return 0;
 205 }
 206
 207 void *json_object_iter(json_t *json)
 208 {
 209     json_object_t *object;
 210
 211     if(!json_is_object(json))
 212         return NULL;
 213
 214     object = json_to_object(json);
 215     return hashtable_iter(&object->hashtable);
 216 }
 217
 218 void *json_object_iter_at(json_t *json, const char *key)
 219 {
 220     json_object_t *object;
 221
 222     if(!key || !json_is_object(json))
 223         return NULL;
 224
 225     object = json_to_object(json);
 226     return hashtable_iter_at(&object->hashtable, key);
 227 }
 228
 229 void *json_object_iter_next(json_t *json, void *iter)
 230 {
 231     json_object_t *object;
 232
 233     if(!json_is_object(json) || iter == NULL)
 234         return NULL;
 235
 236     object = json_to_object(json);
 237     return hashtable_iter_next(&object->hashtable, iter);
 238 }
 239
 240 const char *json_object_iter_key(void *iter)
 241 {
 242     if(!iter)
 243         return NULL;
 244
 245     return hashtable_iter_key(iter);
 246 }
 247
 248 json_t *json_object_iter_value(void *iter)
 249 {
 250     if(!iter)
 251         return NULL;
 252
 253     return (json_t *)hashtable_iter_value(iter);
 254 }
 255
 256 int json_object_iter_set_new(json_t *json, void *iter, json_t *value)
 257 {
 258     if(!json_is_object(json) || !iter || !value)
 259     {
 260         json_decref(value);
 261         return -1;
 262     }
 263
 264     hashtable_iter_set(iter, value);
 265     return 0;
 266 }
 267
 268 void *json_object_key_to_iter(const char *key)
 269 {
 270     if(!key)
 271         return NULL;
 272
 273     return hashtable_key_to_iter(key);
 274 }
 275
 276 static int json_object_equal(const json_t *object1, const json_t *object2)
 277 {
 278     const char *key;
 279     const json_t *value1, *value2;
 280
 281     if(json_object_size(object1) != json_object_size(object2))
 282         return 0;
 283
 284     json_object_foreach((json_t *)object1, key, value1) {
 285         value2 = json_object_get(object2, key);
 286
 287         if(!json_equal(value1, value2))
 288             return 0;
 289     }
 290
 291     return 1;
 292 }
 293
 294 static json_t *json_object_copy(json_t *object)
 295 {
 296     json_t *result;
 297
 298     const char *key;
 299     json_t *value;
 300
 301     result = json_object();
 302     if(!result)
 303         return NULL;
 304
 305     json_object_foreach(object, key, value)
 306         json_object_set_nocheck(result, key, value);
 307
 308     return result;
 309 }
 310
 311 static json_t *json_object_deep_copy(const json_t *object)
 312 {
 313     json_t *result;
 314     void *iter;
 315
 316     result = json_object();
 317     if(!result)
 318         return NULL;
 319
 320     /* Cannot use json_object_foreach because object has to be cast
 321        non-const */
 322     iter = json_object_iter((json_t *)object);
 323     while(iter) {
 324         const char *key;
 325         const json_t *value;
 326         key = json_object_iter_key(iter);
 327         value = json_object_iter_value(iter);
 328
 329         json_object_set_new_nocheck(result, key, json_deep_copy(value));
 330         iter = json_object_iter_next((json_t *)object, iter);
 331     }
 332
 333     return result;
 334 }
 335
 336
 337 /*** array ***/
 338
 339 json_t *json_array(void)
 340 {
 341     json_array_t *array = jsonp_malloc(sizeof(json_array_t));
 342     if(!array)
 343         return NULL;
 344     json_init(&array->json, JSON_ARRAY);
 345
 346     array->entries = 0;
 347     array->size = 8;
 348
 349     array->table = jsonp_malloc(array->size * sizeof(json_t *));
 350     if(!array->table) {
 351         jsonp_free(array);
 352         return NULL;
 353     }
 354
 355     return &array->json;
 356 }
 357
 358 static void json_delete_array(json_array_t *array)
 359 {
 360     size_t i;
 361
 362     for(i = 0; i < array->entries; i++)
 363         json_decref(array->table[i]);
 364
 365     jsonp_free(array->table);
 366     jsonp_free(array);
 367 }
 368
 369 size_t json_array_size(const json_t *json)
 370 {
 371     if(!json_is_array(json))
 372         return 0;
 373
 374     return json_to_array(json)->entries;
 375 }
 376
 377 json_t *json_array_get(const json_t *json, size_t index)
 378 {
 379     json_array_t *array;
 380     if(!json_is_array(json))
 381         return NULL;
 382     array = json_to_array(json);
 383
 384     if(index >= array->entries)
 385         return NULL;
 386
 387     return array->table[index];
 388 }
 389
 390 int json_array_set_new(json_t *json, size_t index, json_t *value)
 391 {
 392     json_array_t *array;
 393
 394     if(!value)
 395         return -1;
 396
 397     if(!json_is_array(json) || json == value)
 398     {
 399         json_decref(value);
 400         return -1;
 401     }
 402     array = json_to_array(json);
 403
 404     if(index >= array->entries)
 405     {
 406         json_decref(value);
 407         return -1;
 408     }
 409
 410     json_decref(array->table[index]);
 411     array->table[index] = value;
 412
 413     return 0;
 414 }
 415
 416 static void array_move(json_array_t *array, size_t dest,
 417                        size_t src, size_t count)
 418 {
 419     memmove(&array->table[dest], &array->table[src], count * sizeof(json_t *));
 420 }
 421
 422 static void array_copy(json_t **dest, size_t dpos,
 423                        json_t **src, size_t spos,
 424                        size_t count)
 425 {
 426     memcpy(&dest[dpos], &src[spos], count * sizeof(json_t *));
 427 }
 428
 429 static json_t **json_array_grow(json_array_t *array,
 430                                 size_t amount,
 431                                 int copy)
 432 {
 433     size_t new_size;
 434     json_t **old_table, **new_table;
 435
 436     if(array->entries + amount <= array->size)
 437         return array->table;
 438
 439     old_table = array->table;
 440
 441     new_size = max(array->size + amount, array->size * 2);
 442     new_table = jsonp_malloc(new_size * sizeof(json_t *));
 443     if(!new_table)
 444         return NULL;
 445
 446     array->size = new_size;
 447     array->table = new_table;
 448
 449     if(copy) {
 450         array_copy(array->table, 0, old_table, 0, array->entries);
 451         jsonp_free(old_table);
 452         return array->table;
 453     }
 454
 455     return old_table;
 456 }
 457
 458 int json_array_append_new(json_t *json, json_t *value)
 459 {
 460     json_array_t *array;
 461
 462     if(!value)
 463         return -1;
 464
 465     if(!json_is_array(json) || json == value)
 466     {
 467         json_decref(value);
 468         return -1;
 469     }
 470     array = json_to_array(json);
 471
 472     if(!json_array_grow(array, 1, 1)) {
 473         json_decref(value);
 474         return -1;
 475     }
 476
 477     array->table[array->entries] = value;
 478     array->entries++;
 479
 480     return 0;
 481 }
 482
 483 int json_array_insert_new(json_t *json, size_t index, json_t *value)
 484 {
 485     json_array_t *array;
 486     json_t **old_table;
 487
 488     if(!value)
 489         return -1;
 490
 491     if(!json_is_array(json) || json == value) {
 492         json_decref(value);
 493         return -1;
 494     }
 495     array = json_to_array(json);
 496
 497     if(index > array->entries) {
 498         json_decref(value);
 499         return -1;
 500     }
 501
 502     old_table = json_array_grow(array, 1, 0);
 503     if(!old_table) {
 504         json_decref(value);
 505         return -1;
 506     }
 507
 508     if(old_table != array->table) {
 509         array_copy(array->table, 0, old_table, 0, index);
 510         array_copy(array->table, index + 1, old_table, index,
 511                    array->entries - index);
 512         jsonp_free(old_table);
 513     }
 514     else
 515         array_move(array, index + 1, index, array->entries - index);
 516
 517     array->table[index] = value;
 518     array->entries++;
 519
 520     return 0;
 521 }
 522
 523 int json_array_remove(json_t *json, size_t index)
 524 {
 525     json_array_t *array;
 526
 527     if(!json_is_array(json))
 528         return -1;
 529     array = json_to_array(json);
 530
 531     if(index >= array->entries)
 532         return -1;
 533
 534     json_decref(array->table[index]);
 535
 536     /* If we're removing the last element, nothing has to be moved */
 537     if(index < array->entries - 1)
 538         array_move(array, index, index + 1, array->entries - index - 1);
 539
 540     array->entries--;
 541
 542     return 0;
 543 }
 544
 545 int json_array_clear(json_t *json)
 546 {
 547     json_array_t *array;
 548     size_t i;
 549
 550     if(!json_is_array(json))
 551         return -1;
 552     array = json_to_array(json);
 553
 554     for(i = 0; i < array->entries; i++)
 555         json_decref(array->table[i]);
 556
 557     array->entries = 0;
 558     return 0;
 559 }
 560
 561 int json_array_extend(json_t *json, json_t *other_json)
 562 {
 563     json_array_t *array, *other;
 564     size_t i;
 565
 566     if(!json_is_array(json) || !json_is_array(other_json))
 567         return -1;
 568     array = json_to_array(json);
 569     other = json_to_array(other_json);
 570
 571     if(!json_array_grow(array, other->entries, 1))
 572         return -1;
 573
 574     for(i = 0; i < other->entries; i++)
 575         json_incref(other->table[i]);
 576
 577     array_copy(array->table, array->entries, other->table, 0, other->entries);
 578
 579     array->entries += other->entries;
 580     return 0;
 581 }
 582
 583 static int json_array_equal(const json_t *array1, const json_t *array2)
 584 {
 585     size_t i, size;
 586
 587     size = json_array_size(array1);
 588     if(size != json_array_size(array2))
 589         return 0;
 590
 591     for(i = 0; i < size; i++)
 592     {
 593         json_t *value1, *value2;
 594
 595         value1 = json_array_get(array1, i);
 596         value2 = json_array_get(array2, i);
 597
 598         if(!json_equal(value1, value2))
 599             return 0;
 600     }
 601
 602     return 1;
 603 }
 604
 605 static json_t *json_array_copy(json_t *array)
 606 {
 607     json_t *result;
 608     size_t i;
 609
 610     result = json_array();
 611     if(!result)
 612         return NULL;
 613
 614     for(i = 0; i < json_array_size(array); i++)
 615         json_array_append(result, json_array_get(array, i));
 616
 617     return result;
 618 }
 619
 620 static json_t *json_array_deep_copy(const json_t *array)
 621 {
 622     json_t *result;
 623     size_t i;
 624
 625     result = json_array();
 626     if(!result)
 627         return NULL;
 628
 629     for(i = 0; i < json_array_size(array); i++)
 630         json_array_append_new(result, json_deep_copy(json_array_get(array, i)));
 631
 632     return result;
 633 }
 634
 635 /*** string ***/
 636
 637 static json_t *string_create(const char *value, size_t len, int own)
 638 {
 639     char *v;
 640     json_string_t *string;
 641
 642     if(!value)
 643         return NULL;
 644
 645     if(own)
 646         v = (char *)value;
 647     else {
 648         v = jsonp_strndup(value, len);
 649         if(!v)
 650             return NULL;
 651     }
 652
 653     string = jsonp_malloc(sizeof(json_string_t));
 654     if(!string) {
 655         if(!own)
 656             jsonp_free(v);
 657         return NULL;
 658     }
 659     json_init(&string->json, JSON_STRING);
 660     string->value = v;
 661     string->length = len;
 662
 663     return &string->json;
 664 }
 665
 666 json_t *json_string_nocheck(const char *value)
 667 {
 668     if(!value)
 669         return NULL;
 670
 671     return string_create(value, strlen(value), 0);
 672 }
 673
 674 json_t *json_stringn_nocheck(const char *value, size_t len)
 675 {
 676     return string_create(value, len, 0);
 677 }
 678
 679 /* this is private; "steal" is not a public API concept */
 680 json_t *jsonp_stringn_nocheck_own(const char *value, size_t len)
 681 {
 682     return string_create(value, len, 1);
 683 }
 684
 685 json_t *json_string(const char *value)
 686 {
 687     if(!value)
 688         return NULL;
 689
 690     return json_stringn(value, strlen(value));
 691 }
 692
 693 json_t *json_stringn(const char *value, size_t len)
 694 {
 695     if(!value || !utf8_check_string(value, len))
 696         return NULL;
 697
 698     return json_stringn_nocheck(value, len);
 699 }
 700
 701 const char *json_string_value(const json_t *json)
 702 {
 703     if(!json_is_string(json))
 704         return NULL;
 705
 706     return json_to_string(json)->value;
 707 }
 708
 709 size_t json_string_length(const json_t *json)
 710 {
 711     if(!json_is_string(json))
 712         return 0;
 713
 714     return json_to_string(json)->length;
 715 }
 716
 717 int json_string_set_nocheck(json_t *json, const char *value)
 718 {
 719     if(!value)
 720         return -1;
 721
 722     return json_string_setn_nocheck(json, value, strlen(value));
 723 }
 724
 725 int json_string_setn_nocheck(json_t *json, const char *value, size_t len)
 726 {
 727     char *dup;
 728     json_string_t *string;
 729
 730     if(!json_is_string(json) || !value)
 731         return -1;
 732
 733     dup = jsonp_strndup(value, len);
 734     if(!dup)
 735         return -1;
 736
 737     string = json_to_string(json);
 738     jsonp_free(string->value);
 739     string->value = dup;
 740     string->length = len;
 741
 742     return 0;
 743 }
 744
 745 int json_string_set(json_t *json, const char *value)
 746 {
 747     if(!value)
 748         return -1;
 749
 750     return json_string_setn(json, value, strlen(value));
 751 }
 752
 753 int json_string_setn(json_t *json, const char *value, size_t len)
 754 {
 755     if(!value || !utf8_check_string(value, len))
 756         return -1;
 757
 758     return json_string_setn_nocheck(json, value, len);
 759 }
 760
 761 static void json_delete_string(json_string_t *string)
 762 {
 763     jsonp_free(string->value);
 764     jsonp_free(string);
 765 }
 766
 767 static int json_string_equal(const json_t *string1, const json_t *string2)
 768 {
 769     json_string_t *s1, *s2;
 770
 771     if(!json_is_string(string1) || !json_is_string(string2))
 772         return 0;
 773
 774     s1 = json_to_string(string1);
 775     s2 = json_to_string(string2);
 776     return s1->length == s2->length && !memcmp(s1->value, s2->value, s1->length);
 777 }
 778
 779 static json_t *json_string_copy(const json_t *string)
 780 {
 781     json_string_t *s;
 782
 783     if(!json_is_string(string))
 784         return NULL;
 785
 786     s = json_to_string(string);
 787     return json_stringn_nocheck(s->value, s->length);
 788 }
 789
 790 json_t *json_vsprintf(const char *fmt, va_list ap) {
 791     int length;
 792     char *buf;
 793     va_list aq;
 794     va_copy(aq, ap);
 795
 796     length = vsnprintf(NULL, 0, fmt, ap);
 797     if (length == 0)
 798         return json_string("");
 799
 800     buf = jsonp_malloc(length + 1);
 801     if (!buf)
 802         return NULL;
 803
 804     vsnprintf(buf, length + 1, fmt, aq);
 805     if (!utf8_check_string(buf, length)) {
 806         jsonp_free(buf);
 807         return NULL;
 808     }
 809
 810     return jsonp_stringn_nocheck_own(buf, length);
 811 }
 812
 813 json_t *json_sprintf(const char *fmt, ...) {
 814     json_t *result;
 815     va_list ap;
 816
 817     va_start(ap, fmt);
 818     result = json_vsprintf(fmt, ap);
 819     va_end(ap);
 820
 821     return result;
 822 }
 823
 824
 825 /*** integer ***/
 826
 827 json_t *json_integer(json_int_t value)
 828 {
 829     json_integer_t *integer = jsonp_malloc(sizeof(json_integer_t));
 830     if(!integer)
 831         return NULL;
 832     json_init(&integer->json, JSON_INTEGER);
 833
 834     integer->value = value;
 835     return &integer->json;
 836 }
 837
 838 json_int_t json_integer_value(const json_t *json)
 839 {
 840     if(!json_is_integer(json))
 841         return 0;
 842
 843     return json_to_integer(json)->value;
 844 }
 845
 846 int json_integer_set(json_t *json, json_int_t value)
 847 {
 848     if(!json_is_integer(json))
 849         return -1;
 850
 851     json_to_integer(json)->value = value;
 852
 853     return 0;
 854 }
 855
 856 static void json_delete_integer(json_integer_t *integer)
 857 {
 858     jsonp_free(integer);
 859 }
 860
 861 static int json_integer_equal(const json_t *integer1, const json_t *integer2)
 862 {
 863     return json_integer_value(integer1) == json_integer_value(integer2);
 864 }
 865
 866 static json_t *json_integer_copy(const json_t *integer)
 867 {
 868     return json_integer(json_integer_value(integer));
 869 }
 870
 871
 872 /*** real ***/
 873
 874 json_t *json_real(double value)
 875 {
 876     json_real_t *real;
 877
 878     if(isnan(value) || isinf(value))
 879         return NULL;
 880
 881     real = jsonp_malloc(sizeof(json_real_t));
 882     if(!real)
 883         return NULL;
 884     json_init(&real->json, JSON_REAL);
 885
 886     real->value = value;
 887     return &real->json;
 888 }
 889
 890 double json_real_value(const json_t *json)
 891 {
 892     if(!json_is_real(json))
 893         return 0;
 894
 895     return json_to_real(json)->value;
 896 }
 897
 898 int json_real_set(json_t *json, double value)
 899 {
 900     if(!json_is_real(json) || isnan(value) || isinf(value))
 901         return -1;
 902
 903     json_to_real(json)->value = value;
 904
 905     return 0;
 906 }
 907
 908 static void json_delete_real(json_real_t *real)
 909 {
 910     jsonp_free(real);
 911 }
 912
 913 static int json_real_equal(const json_t *real1, const json_t *real2)
 914 {
 915     return json_real_value(real1) == json_real_value(real2);
 916 }
 917
 918 static json_t *json_real_copy(const json_t *real)
 919 {
 920     return json_real(json_real_value(real));
 921 }
 922
 923
 924 /*** number ***/
 925
 926 double json_number_value(const json_t *json)
 927 {
 928     if(json_is_integer(json))
 929         return (double)json_integer_value(json);
 930     else if(json_is_real(json))
 931         return json_real_value(json);
 932     else
 933         return 0.0;
 934 }
 935
 936
 937 /*** simple values ***/
 938
 939 json_t *json_true(void)
 940 {
 941     static json_t the_true = {JSON_TRUE, (size_t)-1};
 942     return &the_true;
 943 }
 944
 945
 946 json_t *json_false(void)
 947 {
 948     static json_t the_false = {JSON_FALSE, (size_t)-1};
 949     return &the_false;
 950 }
 951
 952
 953 json_t *json_null(void)
 954 {
 955     static json_t the_null = {JSON_NULL, (size_t)-1};
 956     return &the_null;
 957 }
 958
 959
 960 /*** deletion ***/
 961
 962 void json_delete(json_t *json)
 963 {
 964     if (!json)
 965         return;
 966
 967     switch(json_typeof(json)) {
 968         case JSON_OBJECT:
 969             json_delete_object(json_to_object(json));
 970             break;
 971         case JSON_ARRAY:
 972             json_delete_array(json_to_array(json));
 973             break;
 974         case JSON_STRING:
 975             json_delete_string(json_to_string(json));
 976             break;
 977         case JSON_INTEGER:
 978             json_delete_integer(json_to_integer(json));
 979             break;
 980         case JSON_REAL:
 981             json_delete_real(json_to_real(json));
 982             break;
 983         default:
 984             return;
 985     }
 986
 987     /* json_delete is not called for true, false or null */
 988 }
 989
 990
 991 /*** equality ***/
 992
 993 int json_equal(const json_t *json1, const json_t *json2)
 994 {
 995     if(!json1 || !json2)
 996         return 0;
 997
 998     if(json_typeof(json1) != json_typeof(json2))
 999         return 0;
1000
1001     /* this covers true, false and null as they are singletons */
1002     if(json1 == json2)
1003         return 1;
1004
1005     switch(json_typeof(json1)) {
1006         case JSON_OBJECT:
1007             return json_object_equal(json1, json2);
1008         case JSON_ARRAY:
1009             return json_array_equal(json1, json2);
1010         case JSON_STRING:
1011             return json_string_equal(json1, json2);
1012         case JSON_INTEGER:
1013             return json_integer_equal(json1, json2);
1014         case JSON_REAL:
1015             return json_real_equal(json1, json2);
1016         default:
1017             return 0;
1018     }
1019 }
1020
1021
1022 /*** copying ***/
1023
1024 json_t *json_copy(json_t *json)
1025 {
1026     if(!json)
1027         return NULL;
1028
1029     switch(json_typeof(json)) {
1030         case JSON_OBJECT:
1031             return json_object_copy(json);
1032         case JSON_ARRAY:
1033             return json_array_copy(json);
1034         case JSON_STRING:
1035             return json_string_copy(json);
1036         case JSON_INTEGER:
1037             return json_integer_copy(json);
1038         case JSON_REAL:
1039             return json_real_copy(json);
1040         case JSON_TRUE:
1041         case JSON_FALSE:
1042         case JSON_NULL:
1043             return json;
1044         default:
1045             return NULL;
1046     }
1047
1048     return NULL;
1049 }
1050
1051 json_t *json_deep_copy(const json_t *json)
1052 {
1053     if(!json)
1054         return NULL;
1055
1056     switch(json_typeof(json)) {
1057         case JSON_OBJECT:
1058             return json_object_deep_copy(json);
1059         case JSON_ARRAY:
1060             return json_array_deep_copy(json);
1061             /* for the rest of the types, deep copying doesn't differ from
1062                shallow copying */
1063         case JSON_STRING:
1064             return json_string_copy(json);
1065         case JSON_INTEGER:
1066             return json_integer_copy(json);
1067         case JSON_REAL:
1068             return json_real_copy(json);
1069         case JSON_TRUE:
1070         case JSON_FALSE:
1071         case JSON_NULL:
1072             return (json_t *)json;
1073         default:
1074             return NULL;
1075     }
1076
1077     return NULL;
1078 }