1#include "EXTERN.h" 2#include "perl.h" 3#include "XSUB.h" 4 5#include <assert.h> 6#include <string.h> 7#include <stdlib.h> 8#include <stdio.h> 9#include <limits.h> 10#include <float.h> 11 12#if defined(__BORLANDC__) || defined(_MSC_VER) 13# define snprintf _snprintf // C compilers have this in stdio.h 14#endif 15 16// some old perls do not have this, try to make it work, no 17// guarantees, though. if it breaks, you get to keep the pieces. 18#ifndef UTF8_MAXBYTES 19# define UTF8_MAXBYTES 13 20#endif 21 22// three extra for rounding, sign, and end of string 23#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3) 24 25#define F_ASCII 0x00000001UL 26#define F_LATIN1 0x00000002UL 27#define F_UTF8 0x00000004UL 28#define F_INDENT 0x00000008UL 29#define F_CANONICAL 0x00000010UL 30#define F_SPACE_BEFORE 0x00000020UL 31#define F_SPACE_AFTER 0x00000040UL 32#define F_ALLOW_NONREF 0x00000100UL 33#define F_SHRINK 0x00000200UL 34#define F_ALLOW_BLESSED 0x00000400UL 35#define F_CONV_BLESSED 0x00000800UL 36#define F_RELAXED 0x00001000UL 37#define F_ALLOW_UNKNOWN 0x00002000UL 38#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing 39 40#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 41 42#define INIT_SIZE 32 // initial scalar size to be allocated 43#define INDENT_STEP 3 // spaces per indentation level 44 45#define SHORT_STRING_LEN 16384 // special-case strings of up to this size 46 47#define SB do { 48#define SE } while (0) 49 50#if __GNUC__ >= 3 51# define expect(expr,value) __builtin_expect ((expr), (value)) 52# define INLINE static inline 53#else 54# define expect(expr,value) (expr) 55# define INLINE static 56#endif 57 58#define expect_false(expr) expect ((expr) != 0, 0) 59#define expect_true(expr) expect ((expr) != 0, 1) 60 61#define IN_RANGE_INC(type,val,beg,end) \ 62 ((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \ 63 <= (unsigned type)((unsigned type)(end) - (unsigned type)(beg))) 64 65#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)" 66 67#ifdef USE_ITHREADS 68# define JSON_SLOW 1 69# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1)) 70#else 71# define JSON_SLOW 0 72# define JSON_STASH json_stash 73#endif 74 75static HV *json_stash, *json_boolean_stash; // JSON::XS:: 76static SV *json_true, *json_false; 77 78enum { 79 INCR_M_WS = 0, // initial whitespace skipping, must be 0 80 INCR_M_STR, // inside string 81 INCR_M_BS, // inside backslash 82 INCR_M_C0, // inside comment in initial whitespace sequence 83 INCR_M_C1, // inside comment in other places 84 INCR_M_JSON // outside anything, count nesting 85}; 86 87#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON) 88 89typedef struct { 90 U32 flags; 91 U32 max_depth; 92 STRLEN max_size; 93 94 SV *cb_object; 95 HV *cb_sk_object; 96 97 // for the incremental parser 98 SV *incr_text; // the source text so far 99 STRLEN incr_pos; // the current offset into the text 100 int incr_nest; // {[]}-nesting level 101 unsigned char incr_mode; 102} JSON; 103 104INLINE void 105json_init (JSON *json) 106{ 107 Zero (json, 1, JSON); 108 json->max_depth = 512; 109} 110 111///////////////////////////////////////////////////////////////////////////// 112// utility functions 113 114INLINE SV * 115get_bool (const char *name) 116{ 117 SV *sv = get_sv (name, 1); 118 119 SvREADONLY_on (sv); 120 SvREADONLY_on (SvRV (sv)); 121 122 return sv; 123} 124 125INLINE void 126shrink (SV *sv) 127{ 128 sv_utf8_downgrade (sv, 1); 129 130 if (SvLEN (sv) > SvCUR (sv) + 1) 131 { 132#ifdef SvPV_shrink_to_cur 133 SvPV_shrink_to_cur (sv); 134#elif defined (SvPV_renew) 135 SvPV_renew (sv, SvCUR (sv) + 1); 136#endif 137 } 138} 139 140// decode an utf-8 character and return it, or (UV)-1 in 141// case of an error. 142// we special-case "safe" characters from U+80 .. U+7FF, 143// but use the very good perl function to parse anything else. 144// note that we never call this function for a ascii codepoints 145INLINE UV 146decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen) 147{ 148 if (expect_true (len >= 2 149 && IN_RANGE_INC (char, s[0], 0xc2, 0xdf) 150 && IN_RANGE_INC (char, s[1], 0x80, 0xbf))) 151 { 152 *clen = 2; 153 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); 154 } 155 else 156 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY); 157} 158 159// likewise for encoding, also never called for ascii codepoints 160// this function takes advantage of this fact, although current gccs 161// seem to optimise the check for >= 0x80 away anyways 162INLINE unsigned char * 163encode_utf8 (unsigned char *s, UV ch) 164{ 165 if (expect_false (ch < 0x000080)) 166 *s++ = ch; 167 else if (expect_true (ch < 0x000800)) 168 *s++ = 0xc0 | ( ch >> 6), 169 *s++ = 0x80 | ( ch & 0x3f); 170 else if ( ch < 0x010000) 171 *s++ = 0xe0 | ( ch >> 12), 172 *s++ = 0x80 | ((ch >> 6) & 0x3f), 173 *s++ = 0x80 | ( ch & 0x3f); 174 else if ( ch < 0x110000) 175 *s++ = 0xf0 | ( ch >> 18), 176 *s++ = 0x80 | ((ch >> 12) & 0x3f), 177 *s++ = 0x80 | ((ch >> 6) & 0x3f), 178 *s++ = 0x80 | ( ch & 0x3f); 179 180 return s; 181} 182 183// convert offset pointer to character index, sv must be string 184static STRLEN 185ptr_to_index (SV *sv, char *offset) 186{ 187 return SvUTF8 (sv) 188 ? utf8_distance (offset, SvPVX (sv)) 189 : offset - SvPVX (sv); 190} 191 192///////////////////////////////////////////////////////////////////////////// 193// encoder 194 195// structure used for encoding JSON 196typedef struct 197{ 198 char *cur; // SvPVX (sv) + current output position 199 char *end; // SvEND (sv) 200 SV *sv; // result scalar 201 JSON json; 202 U32 indent; // indentation level 203 UV limit; // escape character values >= this value when encoding 204} enc_t; 205 206INLINE void 207need (enc_t *enc, STRLEN len) 208{ 209 if (expect_false (enc->cur + len >= enc->end)) 210 { 211 STRLEN cur = enc->cur - (char *)SvPVX (enc->sv); 212 SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1); 213 enc->cur = SvPVX (enc->sv) + cur; 214 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1; 215 } 216} 217 218INLINE void 219encode_ch (enc_t *enc, char ch) 220{ 221 need (enc, 1); 222 *enc->cur++ = ch; 223} 224 225static void 226encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 227{ 228 char *end = str + len; 229 230 need (enc, len); 231 232 while (str < end) 233 { 234 unsigned char ch = *(unsigned char *)str; 235 236 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case 237 { 238 if (expect_false (ch == '"')) // but with slow exceptions 239 { 240 need (enc, len += 1); 241 *enc->cur++ = '\\'; 242 *enc->cur++ = '"'; 243 } 244 else if (expect_false (ch == '\\')) 245 { 246 need (enc, len += 1); 247 *enc->cur++ = '\\'; 248 *enc->cur++ = '\\'; 249 } 250 else 251 *enc->cur++ = ch; 252 253 ++str; 254 } 255 else 256 { 257 switch (ch) 258 { 259 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break; 260 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break; 261 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break; 262 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break; 263 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break; 264 265 default: 266 { 267 STRLEN clen; 268 UV uch; 269 270 if (is_utf8) 271 { 272 uch = decode_utf8 (str, end - str, &clen); 273 if (clen == (STRLEN)-1) 274 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str); 275 } 276 else 277 { 278 uch = ch; 279 clen = 1; 280 } 281 282 if (uch < 0x80/*0x20*/ || uch >= enc->limit) 283 { 284 if (uch >= 0x10000UL) 285 { 286 if (uch >= 0x110000UL) 287 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch); 288 289 need (enc, len += 11); 290 sprintf (enc->cur, "\\u%04x\\u%04x", 291 (int)((uch - 0x10000) / 0x400 + 0xD800), 292 (int)((uch - 0x10000) % 0x400 + 0xDC00)); 293 enc->cur += 12; 294 } 295 else 296 { 297 need (enc, len += 5); 298 *enc->cur++ = '\\'; 299 *enc->cur++ = 'u'; 300 *enc->cur++ = PL_hexdigit [ uch >> 12 ]; 301 *enc->cur++ = PL_hexdigit [(uch >> 8) & 15]; 302 *enc->cur++ = PL_hexdigit [(uch >> 4) & 15]; 303 *enc->cur++ = PL_hexdigit [(uch >> 0) & 15]; 304 } 305 306 str += clen; 307 } 308 else if (enc->json.flags & F_LATIN1) 309 { 310 *enc->cur++ = uch; 311 str += clen; 312 } 313 else if (is_utf8) 314 { 315 need (enc, len += clen); 316 do 317 { 318 *enc->cur++ = *str++; 319 } 320 while (--clen); 321 } 322 else 323 { 324 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed 325 enc->cur = encode_utf8 (enc->cur, uch); 326 ++str; 327 } 328 } 329 } 330 } 331 332 --len; 333 } 334} 335 336INLINE void 337encode_indent (enc_t *enc) 338{ 339 if (enc->json.flags & F_INDENT) 340 { 341 int spaces = enc->indent * INDENT_STEP; 342 343 need (enc, spaces); 344 memset (enc->cur, ' ', spaces); 345 enc->cur += spaces; 346 } 347} 348 349INLINE void 350encode_space (enc_t *enc) 351{ 352 need (enc, 1); 353 encode_ch (enc, ' '); 354} 355 356INLINE void 357encode_nl (enc_t *enc) 358{ 359 if (enc->json.flags & F_INDENT) 360 { 361 need (enc, 1); 362 encode_ch (enc, '\n'); 363 } 364} 365 366INLINE void 367encode_comma (enc_t *enc) 368{ 369 encode_ch (enc, ','); 370 371 if (enc->json.flags & F_INDENT) 372 encode_nl (enc); 373 else if (enc->json.flags & F_SPACE_AFTER) 374 encode_space (enc); 375} 376 377static void encode_sv (enc_t *enc, SV *sv); 378 379static void 380encode_av (enc_t *enc, AV *av) 381{ 382 int i, len = av_len (av); 383 384 if (enc->indent >= enc->json.max_depth) 385 croak (ERR_NESTING_EXCEEDED); 386 387 encode_ch (enc, '['); 388 389 if (len >= 0) 390 { 391 encode_nl (enc); ++enc->indent; 392 393 for (i = 0; i <= len; ++i) 394 { 395 SV **svp = av_fetch (av, i, 0); 396 397 encode_indent (enc); 398 399 if (svp) 400 encode_sv (enc, *svp); 401 else 402 encode_str (enc, "null", 4, 0); 403 404 if (i < len) 405 encode_comma (enc); 406 } 407 408 encode_nl (enc); --enc->indent; encode_indent (enc); 409 } 410 411 encode_ch (enc, ']'); 412} 413 414static void 415encode_hk (enc_t *enc, HE *he) 416{ 417 encode_ch (enc, '"'); 418 419 if (HeKLEN (he) == HEf_SVKEY) 420 { 421 SV *sv = HeSVKEY (he); 422 STRLEN len; 423 char *str; 424 425 SvGETMAGIC (sv); 426 str = SvPV (sv, len); 427 428 encode_str (enc, str, len, SvUTF8 (sv)); 429 } 430 else 431 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 432 433 encode_ch (enc, '"'); 434 435 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc); 436 encode_ch (enc, ':'); 437 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc); 438} 439 440// compare hash entries, used when all keys are bytestrings 441static int 442he_cmp_fast (const void *a_, const void *b_) 443{ 444 int cmp; 445 446 HE *a = *(HE **)a_; 447 HE *b = *(HE **)b_; 448 449 STRLEN la = HeKLEN (a); 450 STRLEN lb = HeKLEN (b); 451 452 if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la))) 453 cmp = lb - la; 454 455 return cmp; 456} 457 458// compare hash entries, used when some keys are sv's or utf-x 459static int 460he_cmp_slow (const void *a, const void *b) 461{ 462 return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a)); 463} 464 465static void 466encode_hv (enc_t *enc, HV *hv) 467{ 468 HE *he; 469 470 if (enc->indent >= enc->json.max_depth) 471 croak (ERR_NESTING_EXCEEDED); 472 473 encode_ch (enc, '{'); 474 475 // for canonical output we have to sort by keys first 476 // actually, this is mostly due to the stupid so-called 477 // security workaround added somewhere in 5.8.x 478 // that randomises hash orderings 479 if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv)) 480 { 481 int count = hv_iterinit (hv); 482 483 if (SvMAGICAL (hv)) 484 { 485 // need to count by iterating. could improve by dynamically building the vector below 486 // but I don't care for the speed of this special case. 487 // note also that we will run into undefined behaviour when the two iterations 488 // do not result in the same count, something I might care for in some later release. 489 490 count = 0; 491 while (hv_iternext (hv)) 492 ++count; 493 494 hv_iterinit (hv); 495 } 496 497 if (count) 498 { 499 int i, fast = 1; 500#if defined(__BORLANDC__) || defined(_MSC_VER) 501 HE **hes = _alloca (count * sizeof (HE)); 502#else 503 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode 504#endif 505 506 i = 0; 507 while ((he = hv_iternext (hv))) 508 { 509 hes [i++] = he; 510 if (HeKLEN (he) < 0 || HeKUTF8 (he)) 511 fast = 0; 512 } 513 514 assert (i == count); 515 516 if (fast) 517 qsort (hes, count, sizeof (HE *), he_cmp_fast); 518 else 519 { 520 // hack to forcefully disable "use bytes" 521 COP cop = *PL_curcop; 522 cop.op_private = 0; 523 524 ENTER; 525 SAVETMPS; 526 527 SAVEVPTR (PL_curcop); 528 PL_curcop = &cop; 529 530 qsort (hes, count, sizeof (HE *), he_cmp_slow); 531 532 FREETMPS; 533 LEAVE; 534 } 535 536 encode_nl (enc); ++enc->indent; 537 538 while (count--) 539 { 540 encode_indent (enc); 541 he = hes [count]; 542 encode_hk (enc, he); 543 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he)); 544 545 if (count) 546 encode_comma (enc); 547 } 548 549 encode_nl (enc); --enc->indent; encode_indent (enc); 550 } 551 } 552 else 553 { 554 if (hv_iterinit (hv) || SvMAGICAL (hv)) 555 if ((he = hv_iternext (hv))) 556 { 557 encode_nl (enc); ++enc->indent; 558 559 for (;;) 560 { 561 encode_indent (enc); 562 encode_hk (enc, he); 563 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he)); 564 565 if (!(he = hv_iternext (hv))) 566 break; 567 568 encode_comma (enc); 569 } 570 571 encode_nl (enc); --enc->indent; encode_indent (enc); 572 } 573 } 574 575 encode_ch (enc, '}'); 576} 577 578// encode objects, arrays and special \0=false and \1=true values. 579static void 580encode_rv (enc_t *enc, SV *sv) 581{ 582 svtype svt; 583 584 SvGETMAGIC (sv); 585 svt = SvTYPE (sv); 586 587 if (expect_false (SvOBJECT (sv))) 588 { 589 HV *stash = !JSON_SLOW || json_boolean_stash 590 ? json_boolean_stash 591 : gv_stashpv ("JSON::XS::Boolean", 1); 592 593 if (SvSTASH (sv) == stash) 594 { 595 if (SvIV (sv)) 596 encode_str (enc, "true", 4, 0); 597 else 598 encode_str (enc, "false", 5, 0); 599 } 600 else 601 { 602#if 0 603 if (0 && sv_derived_from (rv, "JSON::Literal")) 604 { 605 // not yet 606 } 607#endif 608 if (enc->json.flags & F_CONV_BLESSED) 609 { 610 // we re-bless the reference to get overload and other niceties right 611 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0); 612 613 if (to_json) 614 { 615 dSP; 616 617 ENTER; SAVETMPS; PUSHMARK (SP); 618 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv))); 619 620 // calling with G_SCALAR ensures that we always get a 1 return value 621 PUTBACK; 622 call_sv ((SV *)GvCV (to_json), G_SCALAR); 623 SPAGAIN; 624 625 // catch this surprisingly common error 626 if (SvROK (TOPs) && SvRV (TOPs) == sv) 627 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv))); 628 629 sv = POPs; 630 PUTBACK; 631 632 encode_sv (enc, sv); 633 634 FREETMPS; LEAVE; 635 } 636 else if (enc->json.flags & F_ALLOW_BLESSED) 637 encode_str (enc, "null", 4, 0); 638 else 639 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it", 640 SvPV_nolen (sv_2mortal (newRV_inc (sv)))); 641 } 642 else if (enc->json.flags & F_ALLOW_BLESSED) 643 encode_str (enc, "null", 4, 0); 644 else 645 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled", 646 SvPV_nolen (sv_2mortal (newRV_inc (sv)))); 647 } 648 } 649 else if (svt == SVt_PVHV) 650 encode_hv (enc, (HV *)sv); 651 else if (svt == SVt_PVAV) 652 encode_av (enc, (AV *)sv); 653 else if (svt < SVt_PVAV) 654 { 655 STRLEN len = 0; 656 char *pv = svt ? SvPV (sv, len) : 0; 657 658 if (len == 1 && *pv == '1') 659 encode_str (enc, "true", 4, 0); 660 else if (len == 1 && *pv == '0') 661 encode_str (enc, "false", 5, 0); 662 else if (enc->json.flags & F_ALLOW_UNKNOWN) 663 encode_str (enc, "null", 4, 0); 664 else 665 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1", 666 SvPV_nolen (sv_2mortal (newRV_inc (sv)))); 667 } 668 else if (enc->json.flags & F_ALLOW_UNKNOWN) 669 encode_str (enc, "null", 4, 0); 670 else 671 croak ("encountered %s, but JSON can only represent references to arrays or hashes", 672 SvPV_nolen (sv_2mortal (newRV_inc (sv)))); 673} 674 675static void 676encode_sv (enc_t *enc, SV *sv) 677{ 678 SvGETMAGIC (sv); 679 680 if (SvPOKp (sv)) 681 { 682 STRLEN len; 683 char *str = SvPV (sv, len); 684 encode_ch (enc, '"'); 685 encode_str (enc, str, len, SvUTF8 (sv)); 686 encode_ch (enc, '"'); 687 } 688 else if (SvNOKp (sv)) 689 { 690 // trust that perl will do the right thing w.r.t. JSON syntax. 691 need (enc, NV_DIG + 32); 692 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 693 enc->cur += strlen (enc->cur); 694 } 695 else if (SvIOKp (sv)) 696 { 697 // we assume we can always read an IV as a UV and vice versa 698 // we assume two's complement 699 // we assume no aliasing issues in the union 700 if (SvIsUV (sv) ? SvUVX (sv) <= 59000 701 : SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000) 702 { 703 // optimise the "small number case" 704 // code will likely be branchless and use only a single multiplication 705 // works for numbers up to 59074 706 I32 i = SvIVX (sv); 707 U32 u; 708 char digit, nz = 0; 709 710 need (enc, 6); 711 712 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0; 713 u = i < 0 ? -i : i; 714 715 // convert to 4.28 fixed-point representation 716 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits 717 718 // now output digit by digit, each time masking out the integer part 719 // and multiplying by 5 while moving the decimal point one to the right, 720 // resulting in a net multiplication by 10. 721 // we always write the digit to memory but conditionally increment 722 // the pointer, to enable the use of conditional move instructions. 723 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5; 724 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5; 725 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5; 726 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5; 727 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0' 728 } 729 else 730 { 731 // large integer, use the (rather slow) snprintf way. 732 need (enc, IVUV_MAXCHARS); 733 enc->cur += 734 SvIsUV(sv) 735 ? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv)) 736 : snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv)); 737 } 738 } 739 else if (SvROK (sv)) 740 encode_rv (enc, SvRV (sv)); 741 else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN) 742 encode_str (enc, "null", 4, 0); 743 else 744 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this", 745 SvPV_nolen (sv), SvFLAGS (sv)); 746} 747 748static SV * 749encode_json (SV *scalar, JSON *json) 750{ 751 enc_t enc; 752 753 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar)) 754 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)"); 755 756 enc.json = *json; 757 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 758 enc.cur = SvPVX (enc.sv); 759 enc.end = SvEND (enc.sv); 760 enc.indent = 0; 761 enc.limit = enc.json.flags & F_ASCII ? 0x000080UL 762 : enc.json.flags & F_LATIN1 ? 0x000100UL 763 : 0x110000UL; 764 765 SvPOK_only (enc.sv); 766 encode_sv (&enc, scalar); 767 encode_nl (&enc); 768 769 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 770 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings 771 772 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8))) 773 SvUTF8_on (enc.sv); 774 775 if (enc.json.flags & F_SHRINK) 776 shrink (enc.sv); 777 778 return enc.sv; 779} 780 781///////////////////////////////////////////////////////////////////////////// 782// decoder 783 784// structure used for decoding JSON 785typedef struct 786{ 787 char *cur; // current parser pointer 788 char *end; // end of input string 789 const char *err; // parse error, if != 0 790 JSON json; 791 U32 depth; // recursion depth 792 U32 maxdepth; // recursion depth limit 793} dec_t; 794 795INLINE void 796decode_comment (dec_t *dec) 797{ 798 // only '#'-style comments allowed a.t.m. 799 800 while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d) 801 ++dec->cur; 802} 803 804INLINE void 805decode_ws (dec_t *dec) 806{ 807 for (;;) 808 { 809 char ch = *dec->cur; 810 811 if (ch > 0x20) 812 { 813 if (expect_false (ch == '#')) 814 { 815 if (dec->json.flags & F_RELAXED) 816 decode_comment (dec); 817 else 818 break; 819 } 820 else 821 break; 822 } 823 else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09) 824 break; // parse error, but let higher level handle it, gives better error messages 825 826 ++dec->cur; 827 } 828} 829 830#define ERR(reason) SB dec->err = reason; goto fail; SE 831 832#define EXPECT_CH(ch) SB \ 833 if (*dec->cur != ch) \ 834 ERR (# ch " expected"); \ 835 ++dec->cur; \ 836 SE 837 838#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED) 839#define DEC_DEC_DEPTH --dec->depth 840 841static SV *decode_sv (dec_t *dec); 842 843static signed char decode_hexdigit[256]; 844 845static UV 846decode_4hex (dec_t *dec) 847{ 848 signed char d1, d2, d3, d4; 849 unsigned char *cur = (unsigned char *)dec->cur; 850 851 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected"); 852 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected"); 853 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected"); 854 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected"); 855 856 dec->cur += 4; 857 858 return ((UV)d1) << 12 859 | ((UV)d2) << 8 860 | ((UV)d3) << 4 861 | ((UV)d4); 862 863fail: 864 return (UV)-1; 865} 866 867static SV * 868decode_str (dec_t *dec) 869{ 870 SV *sv = 0; 871 int utf8 = 0; 872 char *dec_cur = dec->cur; 873 874 do 875 { 876 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES]; 877 char *cur = buf; 878 879 do 880 { 881 unsigned char ch = *(unsigned char *)dec_cur++; 882 883 if (expect_false (ch == '"')) 884 { 885 --dec_cur; 886 break; 887 } 888 else if (expect_false (ch == '\\')) 889 { 890 switch (*dec_cur) 891 { 892 case '\\': 893 case '/': 894 case '"': *cur++ = *dec_cur++; break; 895 896 case 'b': ++dec_cur; *cur++ = '\010'; break; 897 case 't': ++dec_cur; *cur++ = '\011'; break; 898 case 'n': ++dec_cur; *cur++ = '\012'; break; 899 case 'f': ++dec_cur; *cur++ = '\014'; break; 900 case 'r': ++dec_cur; *cur++ = '\015'; break; 901 902 case 'u': 903 { 904 UV lo, hi; 905 ++dec_cur; 906 907 dec->cur = dec_cur; 908 hi = decode_4hex (dec); 909 dec_cur = dec->cur; 910 if (hi == (UV)-1) 911 goto fail; 912 913 // possibly a surrogate pair 914 if (hi >= 0xd800) 915 if (hi < 0xdc00) 916 { 917 if (dec_cur [0] != '\\' || dec_cur [1] != 'u') 918 ERR ("missing low surrogate character in surrogate pair"); 919 920 dec_cur += 2; 921 922 dec->cur = dec_cur; 923 lo = decode_4hex (dec); 924 dec_cur = dec->cur; 925 if (lo == (UV)-1) 926 goto fail; 927 928 if (lo < 0xdc00 || lo >= 0xe000) 929 ERR ("surrogate pair expected"); 930 931 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 932 } 933 else if (hi < 0xe000) 934 ERR ("missing high surrogate character in surrogate pair"); 935 936 if (hi >= 0x80) 937 { 938 utf8 = 1; 939 940 cur = encode_utf8 (cur, hi); 941 } 942 else 943 *cur++ = hi; 944 } 945 break; 946 947 default: 948 --dec_cur; 949 ERR ("illegal backslash escape sequence in string"); 950 } 951 } 952 else if (expect_true (ch >= 0x20 && ch < 0x80)) 953 *cur++ = ch; 954 else if (ch >= 0x80) 955 { 956 STRLEN clen; 957 958 --dec_cur; 959 960 decode_utf8 (dec_cur, dec->end - dec_cur, &clen); 961 if (clen == (STRLEN)-1) 962 ERR ("malformed UTF-8 character in JSON string"); 963 964 do 965 *cur++ = *dec_cur++; 966 while (--clen); 967 968 utf8 = 1; 969 } 970 else 971 { 972 --dec_cur; 973 974 if (!ch) 975 ERR ("unexpected end of string while parsing JSON string"); 976 else 977 ERR ("invalid character encountered while parsing JSON string"); 978 } 979 } 980 while (cur < buf + SHORT_STRING_LEN); 981 982 { 983 STRLEN len = cur - buf; 984 985 if (sv) 986 { 987 STRLEN cur = SvCUR (sv); 988 989 if (SvLEN (sv) <= cur + len) 990 SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1); 991 992 memcpy (SvPVX (sv) + SvCUR (sv), buf, len); 993 SvCUR_set (sv, SvCUR (sv) + len); 994 } 995 else 996 sv = newSVpvn (buf, len); 997 } 998 } 999 while (*dec_cur != '"'); 1000 1001 ++dec_cur; 1002 1003 if (sv) 1004 { 1005 SvPOK_only (sv); 1006 *SvEND (sv) = 0; 1007 1008 if (utf8) 1009 SvUTF8_on (sv); 1010 } 1011 else 1012 sv = newSVpvn ("", 0); 1013 1014 dec->cur = dec_cur; 1015 return sv; 1016 1017fail: 1018 dec->cur = dec_cur; 1019 return 0; 1020} 1021 1022static SV * 1023decode_num (dec_t *dec) 1024{ 1025 int is_nv = 0; 1026 char *start = dec->cur; 1027 1028 // [minus] 1029 if (*dec->cur == '-') 1030 ++dec->cur; 1031 1032 if (*dec->cur == '0') 1033 { 1034 ++dec->cur; 1035 if (*dec->cur >= '0' && *dec->cur <= '9') 1036 ERR ("malformed number (leading zero must not be followed by another digit)"); 1037 } 1038 else if (*dec->cur < '0' || *dec->cur > '9') 1039 ERR ("malformed number (no digits after initial minus)"); 1040 else 1041 do 1042 { 1043 ++dec->cur; 1044 } 1045 while (*dec->cur >= '0' && *dec->cur <= '9'); 1046 1047 // [frac] 1048 if (*dec->cur == '.') 1049 { 1050 ++dec->cur; 1051 1052 if (*dec->cur < '0' || *dec->cur > '9') 1053 ERR ("malformed number (no digits after decimal point)"); 1054 1055 do 1056 { 1057 ++dec->cur; 1058 } 1059 while (*dec->cur >= '0' && *dec->cur <= '9'); 1060 1061 is_nv = 1; 1062 } 1063 1064 // [exp] 1065 if (*dec->cur == 'e' || *dec->cur == 'E') 1066 { 1067 ++dec->cur; 1068 1069 if (*dec->cur == '-' || *dec->cur == '+') 1070 ++dec->cur; 1071 1072 if (*dec->cur < '0' || *dec->cur > '9') 1073 ERR ("malformed number (no digits after exp sign)"); 1074 1075 do 1076 { 1077 ++dec->cur; 1078 } 1079 while (*dec->cur >= '0' && *dec->cur <= '9'); 1080 1081 is_nv = 1; 1082 } 1083 1084 if (!is_nv) 1085 { 1086 int len = dec->cur - start; 1087 1088 // special case the rather common 1..5-digit-int case 1089 if (*start == '-') 1090 switch (len) 1091 { 1092 case 2: return newSViv (-(IV)( start [1] - '0' * 1)); 1093 case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11)); 1094 case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111)); 1095 case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111)); 1096 case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111)); 1097 } 1098 else 1099 switch (len) 1100 { 1101 case 1: return newSViv ( start [0] - '0' * 1); 1102 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11); 1103 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111); 1104 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111); 1105 case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111); 1106 } 1107 1108 { 1109 UV uv; 1110 int numtype = grok_number (start, len, &uv); 1111 if (numtype & IS_NUMBER_IN_UV) 1112 if (numtype & IS_NUMBER_NEG) 1113 { 1114 if (uv < (UV)IV_MIN) 1115 return newSViv (-(IV)uv); 1116 } 1117 else 1118 return newSVuv (uv); 1119 } 1120 1121 len -= *start == '-' ? 1 : 0; 1122 1123 // does not fit into IV or UV, try NV 1124 if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len) 1125 #if defined (LDBL_DIG) 1126 || (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len) 1127 #endif 1128 ) 1129 // fits into NV without loss of precision 1130 return newSVnv (Atof (start)); 1131 1132 // everything else fails, convert it to a string 1133 return newSVpvn (start, dec->cur - start); 1134 } 1135 1136 // loss of precision here 1137 return newSVnv (Atof (start)); 1138 1139fail: 1140 return 0; 1141} 1142 1143static SV * 1144decode_av (dec_t *dec) 1145{ 1146 AV *av = newAV (); 1147 1148 DEC_INC_DEPTH; 1149 decode_ws (dec); 1150 1151 if (*dec->cur == ']') 1152 ++dec->cur; 1153 else 1154 for (;;) 1155 { 1156 SV *value; 1157 1158 value = decode_sv (dec); 1159 if (!value) 1160 goto fail; 1161 1162 av_push (av, value); 1163 1164 decode_ws (dec); 1165 1166 if (*dec->cur == ']') 1167 { 1168 ++dec->cur; 1169 break; 1170 } 1171 1172 if (*dec->cur != ',') 1173 ERR (", or ] expected while parsing array"); 1174 1175 ++dec->cur; 1176 1177 decode_ws (dec); 1178 1179 if (*dec->cur == ']' && dec->json.flags & F_RELAXED) 1180 { 1181 ++dec->cur; 1182 break; 1183 } 1184 } 1185 1186 DEC_DEC_DEPTH; 1187 return newRV_noinc ((SV *)av); 1188 1189fail: 1190 SvREFCNT_dec (av); 1191 DEC_DEC_DEPTH; 1192 return 0; 1193} 1194 1195static SV * 1196decode_hv (dec_t *dec) 1197{ 1198 SV *sv; 1199 HV *hv = newHV (); 1200 1201 DEC_INC_DEPTH; 1202 decode_ws (dec); 1203 1204 if (*dec->cur == '}') 1205 ++dec->cur; 1206 else 1207 for (;;) 1208 { 1209 EXPECT_CH ('"'); 1210 1211 // heuristic: assume that 1212 // a) decode_str + hv_store_ent are abysmally slow. 1213 // b) most hash keys are short, simple ascii text. 1214 // => try to "fast-match" such strings to avoid 1215 // the overhead of decode_str + hv_store_ent. 1216 { 1217 SV *value; 1218 char *p = dec->cur; 1219 char *e = p + 24; // only try up to 24 bytes 1220 1221 for (;;) 1222 { 1223 // the >= 0x80 is false on most architectures 1224 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\') 1225 { 1226 // slow path, back up and use decode_str 1227 SV *key = decode_str (dec); 1228 if (!key) 1229 goto fail; 1230 1231 decode_ws (dec); EXPECT_CH (':'); 1232 1233 decode_ws (dec); 1234 value = decode_sv (dec); 1235 if (!value) 1236 { 1237 SvREFCNT_dec (key); 1238 goto fail; 1239 } 1240 1241 hv_store_ent (hv, key, value, 0); 1242 SvREFCNT_dec (key); 1243 1244 break; 1245 } 1246 else if (*p == '"') 1247 { 1248 // fast path, got a simple key 1249 char *key = dec->cur; 1250 int len = p - key; 1251 dec->cur = p + 1; 1252 1253 decode_ws (dec); EXPECT_CH (':'); 1254 1255 decode_ws (dec); 1256 value = decode_sv (dec); 1257 if (!value) 1258 goto fail; 1259 1260 hv_store (hv, key, len, value, 0); 1261 1262 break; 1263 } 1264 1265 ++p; 1266 } 1267 } 1268 1269 decode_ws (dec); 1270 1271 if (*dec->cur == '}') 1272 { 1273 ++dec->cur; 1274 break; 1275 } 1276 1277 if (*dec->cur != ',') 1278 ERR (", or } expected while parsing object/hash"); 1279 1280 ++dec->cur; 1281 1282 decode_ws (dec); 1283 1284 if (*dec->cur == '}' && dec->json.flags & F_RELAXED) 1285 { 1286 ++dec->cur; 1287 break; 1288 } 1289 } 1290 1291 DEC_DEC_DEPTH; 1292 sv = newRV_noinc ((SV *)hv); 1293 1294 // check filter callbacks 1295 if (dec->json.flags & F_HOOK) 1296 { 1297 if (dec->json.cb_sk_object && HvKEYS (hv) == 1) 1298 { 1299 HE *cb, *he; 1300 1301 hv_iterinit (hv); 1302 he = hv_iternext (hv); 1303 hv_iterinit (hv); 1304 1305 // the next line creates a mortal sv each time its called. 1306 // might want to optimise this for common cases. 1307 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0); 1308 1309 if (cb) 1310 { 1311 dSP; 1312 int count; 1313 1314 ENTER; SAVETMPS; PUSHMARK (SP); 1315 XPUSHs (HeVAL (he)); 1316 1317 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN; 1318 1319 if (count == 1) 1320 { 1321 sv = newSVsv (POPs); 1322 FREETMPS; LEAVE; 1323 return sv; 1324 } 1325 1326 FREETMPS; LEAVE; 1327 } 1328 } 1329 1330 if (dec->json.cb_object) 1331 { 1332 dSP; 1333 int count; 1334 1335 ENTER; SAVETMPS; PUSHMARK (SP); 1336 XPUSHs (sv_2mortal (sv)); 1337 1338 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN; 1339 1340 if (count == 1) 1341 { 1342 sv = newSVsv (POPs); 1343 FREETMPS; LEAVE; 1344 return sv; 1345 } 1346 1347 SvREFCNT_inc (sv); 1348 FREETMPS; LEAVE; 1349 } 1350 } 1351 1352 return sv; 1353 1354fail: 1355 SvREFCNT_dec (hv); 1356 DEC_DEC_DEPTH; 1357 return 0; 1358} 1359 1360static SV * 1361decode_sv (dec_t *dec) 1362{ 1363 // the beauty of JSON: you need exactly one character lookahead 1364 // to parse everything. 1365 switch (*dec->cur) 1366 { 1367 case '"': ++dec->cur; return decode_str (dec); 1368 case '[': ++dec->cur; return decode_av (dec); 1369 case '{': ++dec->cur; return decode_hv (dec); 1370 1371 case '-': 1372 case '0': case '1': case '2': case '3': case '4': 1373 case '5': case '6': case '7': case '8': case '9': 1374 return decode_num (dec); 1375 1376 case 't': 1377 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1378 { 1379 dec->cur += 4; 1380#if JSON_SLOW 1381 json_true = get_bool ("JSON::XS::true"); 1382#endif 1383 return newSVsv (json_true); 1384 } 1385 else 1386 ERR ("'true' expected"); 1387 1388 break; 1389 1390 case 'f': 1391 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1392 { 1393 dec->cur += 5; 1394#if JSON_SLOW 1395 json_false = get_bool ("JSON::XS::false"); 1396#endif 1397 return newSVsv (json_false); 1398 } 1399 else 1400 ERR ("'false' expected"); 1401 1402 break; 1403 1404 case 'n': 1405 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1406 { 1407 dec->cur += 4; 1408 return newSVsv (&PL_sv_undef); 1409 } 1410 else 1411 ERR ("'null' expected"); 1412 1413 break; 1414 1415 default: 1416 ERR ("malformed JSON string, neither array, object, number, string or atom"); 1417 break; 1418 } 1419 1420fail: 1421 return 0; 1422} 1423 1424static SV * 1425decode_json (SV *string, JSON *json, char **offset_return) 1426{ 1427 dec_t dec; 1428 SV *sv; 1429 1430 /* work around bugs in 5.10 where manipulating magic values 1431 * will perl ignore the magic in subsequent accesses 1432 */ 1433 /*SvGETMAGIC (string);*/ 1434 if (SvMAGICAL (string)) 1435 string = sv_2mortal (newSVsv (string)); 1436 1437 SvUPGRADE (string, SVt_PV); 1438 1439 /* work around a bug in perl 5.10, which causes SvCUR to fail an 1440 * assertion with -DDEBUGGING, although SvCUR is documented to 1441 * return the xpv_cur field which certainly exists after upgrading. 1442 * according to nicholas clark, calling SvPOK fixes this. 1443 * But it doesn't fix it, so try another workaround, call SvPV_nolen 1444 * and hope for the best. 1445 * Damnit, SvPV_nolen still trips over yet another assertion. This 1446 * assertion business is seriously broken, try yet another workaround 1447 * for the broken -DDEBUGGING. 1448 */ 1449 { 1450#ifdef DEBUGGING 1451 STRLEN offset = SvOK (string) ? sv_len (string) : 0; 1452#else 1453 STRLEN offset = SvCUR (string); 1454#endif 1455 1456 if (offset > json->max_size && json->max_size) 1457 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu", 1458 (unsigned long)SvCUR (string), (unsigned long)json->max_size); 1459 } 1460 1461 if (json->flags & F_UTF8) 1462 sv_utf8_downgrade (string, 0); 1463 else 1464 sv_utf8_upgrade (string); 1465 1466 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1467 1468 dec.json = *json; 1469 dec.cur = SvPVX (string); 1470 dec.end = SvEND (string); 1471 dec.err = 0; 1472 dec.depth = 0; 1473 1474 if (dec.json.cb_object || dec.json.cb_sk_object) 1475 dec.json.flags |= F_HOOK; 1476 1477 *dec.end = 0; // this should basically be a nop, too, but make sure it's there 1478 1479 decode_ws (&dec); 1480 sv = decode_sv (&dec); 1481 1482 if (offset_return) 1483 *offset_return = dec.cur; 1484 1485 if (!(offset_return || !sv)) 1486 { 1487 // check for trailing garbage 1488 decode_ws (&dec); 1489 1490 if (*dec.cur) 1491 { 1492 dec.err = "garbage after JSON object"; 1493 SvREFCNT_dec (sv); 1494 sv = 0; 1495 } 1496 } 1497 1498 if (!sv) 1499 { 1500 SV *uni = sv_newmortal (); 1501 1502 // horrible hack to silence warning inside pv_uni_display 1503 COP cop = *PL_curcop; 1504 cop.cop_warnings = pWARN_NONE; 1505 ENTER; 1506 SAVEVPTR (PL_curcop); 1507 PL_curcop = &cop; 1508 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1509 LEAVE; 1510 1511 croak ("%s, at character offset %d (before \"%s\")", 1512 dec.err, 1513 ptr_to_index (string, dec.cur), 1514 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1515 } 1516 1517 sv = sv_2mortal (sv); 1518 1519 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1520 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)"); 1521 1522 return sv; 1523} 1524 1525///////////////////////////////////////////////////////////////////////////// 1526// incremental parser 1527 1528static void 1529incr_parse (JSON *self) 1530{ 1531 const char *p = SvPVX (self->incr_text) + self->incr_pos; 1532 1533 // the state machine here is a bit convoluted and could be simplified a lot 1534 // but this would make it slower, so... 1535 1536 for (;;) 1537 { 1538 //printf ("loop pod %d *p<%c><%s>, mode %d nest %d\n", p - SvPVX (self->incr_text), *p, p, self->incr_mode, self->incr_nest);//D 1539 switch (self->incr_mode) 1540 { 1541 // only used for initial whitespace skipping 1542 case INCR_M_WS: 1543 for (;;) 1544 { 1545 if (*p > 0x20) 1546 { 1547 if (*p == '#') 1548 { 1549 self->incr_mode = INCR_M_C0; 1550 goto incr_m_c; 1551 } 1552 else 1553 { 1554 self->incr_mode = INCR_M_JSON; 1555 goto incr_m_json; 1556 } 1557 } 1558 else if (!*p) 1559 goto interrupt; 1560 1561 ++p; 1562 } 1563 1564 // skip a single char inside a string (for \\-processing) 1565 case INCR_M_BS: 1566 if (!*p) 1567 goto interrupt; 1568 1569 ++p; 1570 self->incr_mode = INCR_M_STR; 1571 goto incr_m_str; 1572 1573 // inside #-style comments 1574 case INCR_M_C0: 1575 case INCR_M_C1: 1576 incr_m_c: 1577 for (;;) 1578 { 1579 if (*p == '\n') 1580 { 1581 self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON; 1582 break; 1583 } 1584 else if (!*p) 1585 goto interrupt; 1586 1587 ++p; 1588 } 1589 1590 break; 1591 1592 // inside a string 1593 case INCR_M_STR: 1594 incr_m_str: 1595 for (;;) 1596 { 1597 if (*p == '"') 1598 { 1599 ++p; 1600 self->incr_mode = INCR_M_JSON; 1601 1602 if (!self->incr_nest) 1603 goto interrupt; 1604 1605 goto incr_m_json; 1606 } 1607 else if (*p == '\\') 1608 { 1609 ++p; // "virtually" consumes character after \ 1610 1611 if (!*p) // if at end of string we have to switch modes 1612 { 1613 self->incr_mode = INCR_M_BS; 1614 goto interrupt; 1615 } 1616 } 1617 else if (!*p) 1618 goto interrupt; 1619 1620 ++p; 1621 } 1622 1623 // after initial ws, outside string 1624 case INCR_M_JSON: 1625 incr_m_json: 1626 for (;;) 1627 { 1628 switch (*p++) 1629 { 1630 case 0: 1631 --p; 1632 goto interrupt; 1633 1634 case 0x09: 1635 case 0x0a: 1636 case 0x0d: 1637 case 0x20: 1638 if (!self->incr_nest) 1639 { 1640 --p; // do not eat the whitespace, let the next round do it 1641 goto interrupt; 1642 } 1643 break; 1644 1645 case '"': 1646 self->incr_mode = INCR_M_STR; 1647 goto incr_m_str; 1648 1649 case '[': 1650 case '{': 1651 if (++self->incr_nest > self->max_depth) 1652 croak (ERR_NESTING_EXCEEDED); 1653 break; 1654 1655 case ']': 1656 case '}': 1657 if (--self->incr_nest <= 0) 1658 goto interrupt; 1659 break; 1660 1661 case '#': 1662 self->incr_mode = INCR_M_C1; 1663 goto incr_m_c; 1664 } 1665 } 1666 } 1667 1668 modechange: 1669 ; 1670 } 1671 1672interrupt: 1673 self->incr_pos = p - SvPVX (self->incr_text); 1674 //printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D 1675 //printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D 1676} 1677 1678///////////////////////////////////////////////////////////////////////////// 1679// XS interface functions 1680 1681MODULE = JSON::XS PACKAGE = JSON::XS 1682 1683BOOT: 1684{ 1685 int i; 1686 1687 for (i = 0; i < 256; ++i) 1688 decode_hexdigit [i] = 1689 i >= '0' && i <= '9' ? i - '0' 1690 : i >= 'a' && i <= 'f' ? i - 'a' + 10 1691 : i >= 'A' && i <= 'F' ? i - 'A' + 10 1692 : -1; 1693 1694 json_stash = gv_stashpv ("JSON::XS" , 1); 1695 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1); 1696 1697 json_true = get_bool ("JSON::XS::true"); 1698 json_false = get_bool ("JSON::XS::false"); 1699 1700 CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */ 1701} 1702 1703PROTOTYPES: DISABLE 1704 1705void CLONE (...) 1706 CODE: 1707 json_stash = 0; 1708 json_boolean_stash = 0; 1709 1710void new (char *klass) 1711 PPCODE: 1712{ 1713 SV *pv = NEWSV (0, sizeof (JSON)); 1714 SvPOK_only (pv); 1715 json_init ((JSON *)SvPVX (pv)); 1716 XPUSHs (sv_2mortal (sv_bless ( 1717 newRV_noinc (pv), 1718 strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1) 1719 ))); 1720} 1721 1722void ascii (JSON *self, int enable = 1) 1723 ALIAS: 1724 ascii = F_ASCII 1725 latin1 = F_LATIN1 1726 utf8 = F_UTF8 1727 indent = F_INDENT 1728 canonical = F_CANONICAL 1729 space_before = F_SPACE_BEFORE 1730 space_after = F_SPACE_AFTER 1731 pretty = F_PRETTY 1732 allow_nonref = F_ALLOW_NONREF 1733 shrink = F_SHRINK 1734 allow_blessed = F_ALLOW_BLESSED 1735 convert_blessed = F_CONV_BLESSED 1736 relaxed = F_RELAXED 1737 allow_unknown = F_ALLOW_UNKNOWN 1738 PPCODE: 1739{ 1740 if (enable) 1741 self->flags |= ix; 1742 else 1743 self->flags &= ~ix; 1744 1745 XPUSHs (ST (0)); 1746} 1747 1748void get_ascii (JSON *self) 1749 ALIAS: 1750 get_ascii = F_ASCII 1751 get_latin1 = F_LATIN1 1752 get_utf8 = F_UTF8 1753 get_indent = F_INDENT 1754 get_canonical = F_CANONICAL 1755 get_space_before = F_SPACE_BEFORE 1756 get_space_after = F_SPACE_AFTER 1757 get_allow_nonref = F_ALLOW_NONREF 1758 get_shrink = F_SHRINK 1759 get_allow_blessed = F_ALLOW_BLESSED 1760 get_convert_blessed = F_CONV_BLESSED 1761 get_relaxed = F_RELAXED 1762 get_allow_unknown = F_ALLOW_UNKNOWN 1763 PPCODE: 1764 XPUSHs (boolSV (self->flags & ix)); 1765 1766void max_depth (JSON *self, U32 max_depth = 0x80000000UL) 1767 PPCODE: 1768 self->max_depth = max_depth; 1769 XPUSHs (ST (0)); 1770 1771U32 get_max_depth (JSON *self) 1772 CODE: 1773 RETVAL = self->max_depth; 1774 OUTPUT: 1775 RETVAL 1776 1777void max_size (JSON *self, U32 max_size = 0) 1778 PPCODE: 1779 self->max_size = max_size; 1780 XPUSHs (ST (0)); 1781 1782int get_max_size (JSON *self) 1783 CODE: 1784 RETVAL = self->max_size; 1785 OUTPUT: 1786 RETVAL 1787 1788void filter_json_object (JSON *self, SV *cb = &PL_sv_undef) 1789 PPCODE: 1790{ 1791 SvREFCNT_dec (self->cb_object); 1792 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0; 1793 1794 XPUSHs (ST (0)); 1795} 1796 1797void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef) 1798 PPCODE: 1799{ 1800 if (!self->cb_sk_object) 1801 self->cb_sk_object = newHV (); 1802 1803 if (SvOK (cb)) 1804 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0); 1805 else 1806 { 1807 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0); 1808 1809 if (!HvKEYS (self->cb_sk_object)) 1810 { 1811 SvREFCNT_dec (self->cb_sk_object); 1812 self->cb_sk_object = 0; 1813 } 1814 } 1815 1816 XPUSHs (ST (0)); 1817} 1818 1819void encode (JSON *self, SV *scalar) 1820 PPCODE: 1821 XPUSHs (encode_json (scalar, self)); 1822 1823void decode (JSON *self, SV *jsonstr) 1824 PPCODE: 1825 XPUSHs (decode_json (jsonstr, self, 0)); 1826 1827void decode_prefix (JSON *self, SV *jsonstr) 1828 PPCODE: 1829{ 1830 char *offset; 1831 EXTEND (SP, 2); 1832 PUSHs (decode_json (jsonstr, self, &offset)); 1833 PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset)))); 1834} 1835 1836void incr_parse (JSON *self, SV *jsonstr = 0) 1837 PPCODE: 1838{ 1839 if (!self->incr_text) 1840 self->incr_text = newSVpvn ("", 0); 1841 1842 // append data, if any 1843 if (jsonstr) 1844 { 1845 if (SvUTF8 (jsonstr)) 1846 { 1847 if (!SvUTF8 (self->incr_text)) 1848 { 1849 /* utf-8-ness differs, need to upgrade */ 1850 sv_utf8_upgrade (self->incr_text); 1851 1852 if (self->incr_pos) 1853 self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos) 1854 - (U8 *)SvPVX (self->incr_text); 1855 } 1856 } 1857 else if (SvUTF8 (self->incr_text)) 1858 sv_utf8_upgrade (jsonstr); 1859 1860 { 1861 STRLEN len; 1862 const char *str = SvPV (jsonstr, len); 1863 STRLEN cur = SvCUR (self->incr_text); 1864 1865 if (SvLEN (self->incr_text) <= cur + len) 1866 SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1); 1867 1868 Move (str, SvEND (self->incr_text), len, char); 1869 SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len); 1870 *SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there 1871 } 1872 } 1873 1874 if (GIMME_V != G_VOID) 1875 do 1876 { 1877 char *offset; 1878 1879 if (!INCR_DONE (self)) 1880 { 1881 incr_parse (self); 1882 1883 if (self->incr_pos > self->max_size && self->max_size) 1884 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu", 1885 (unsigned long)self->incr_pos, (unsigned long)self->max_size); 1886 1887 if (!INCR_DONE (self)) 1888 break; 1889 } 1890 1891 XPUSHs (decode_json (self->incr_text, self, &offset)); 1892 1893 self->incr_pos -= offset - SvPVX (self->incr_text); 1894 self->incr_nest = 0; 1895 self->incr_mode = 0; 1896 1897 sv_chop (self->incr_text, offset); 1898 } 1899 while (GIMME_V == G_ARRAY); 1900} 1901 1902SV *incr_text (JSON *self) 1903 ATTRS: lvalue 1904 CODE: 1905{ 1906 if (self->incr_pos) 1907 croak ("incr_text can not be called when the incremental parser already started parsing"); 1908 1909 RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef; 1910} 1911 OUTPUT: 1912 RETVAL 1913 1914void incr_skip (JSON *self) 1915 CODE: 1916{ 1917 if (self->incr_pos) 1918 { 1919 sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos); 1920 self->incr_pos = 0; 1921 self->incr_nest = 0; 1922 self->incr_mode = 0; 1923 } 1924} 1925 1926void incr_reset (JSON *self) 1927 CODE: 1928{ 1929 SvREFCNT_dec (self->incr_text); 1930 self->incr_text = 0; 1931 self->incr_pos = 0; 1932 self->incr_nest = 0; 1933 self->incr_mode = 0; 1934} 1935 1936void DESTROY (JSON *self) 1937 CODE: 1938 SvREFCNT_dec (self->cb_sk_object); 1939 SvREFCNT_dec (self->cb_object); 1940 SvREFCNT_dec (self->incr_text); 1941 1942PROTOTYPES: ENABLE 1943 1944void encode_json (SV *scalar) 1945 ALIAS: 1946 to_json_ = 0 1947 encode_json = F_UTF8 1948 PPCODE: 1949{ 1950 JSON json; 1951 json_init (&json); 1952 json.flags |= ix; 1953 XPUSHs (encode_json (scalar, &json)); 1954} 1955 1956void decode_json (SV *jsonstr) 1957 ALIAS: 1958 from_json_ = 0 1959 decode_json = F_UTF8 1960 PPCODE: 1961{ 1962 JSON json; 1963 json_init (&json); 1964 json.flags |= ix; 1965 XPUSHs (decode_json (jsonstr, &json, 0)); 1966} 1967 1968 1969