ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/JSON-XS/XS.xs
(Generate patch)

Comparing JSON-XS/XS.xs (file contents):
Revision 1.1 by root, Thu Mar 22 16:40:16 2007 UTC vs.
Revision 1.128 by root, Fri Oct 7 05:18:48 2016 UTC

1#include "EXTERN.h" 1#include "EXTERN.h"
2#include "perl.h" 2#include "perl.h"
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5#include "assert.h" 5#include <assert.h>
6#include "string.h" 6#include <string.h>
7#include "stdlib.h" 7#include <stdlib.h>
8#include <stdio.h>
9#include <limits.h>
10#include <float.h>
8 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// compatibility with perl <5.18
23#ifndef HvNAMELEN_get
24# define HvNAMELEN_get(hv) strlen (HvNAME (hv))
25#endif
26#ifndef HvNAMELEN
27# define HvNAMELEN(hv) HvNAMELEN_get (hv)
28#endif
29#ifndef HvNAMEUTF8
30# define HvNAMEUTF8(hv) 0
31#endif
32
33// three extra for rounding, sign, and end of string
34#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
35
9#define F_ASCII 0x00000001 36#define F_ASCII 0x00000001UL
37#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 38#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 39#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 40#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 41#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 42#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040 43#define F_ALLOW_NONREF 0x00000100UL
44#define F_SHRINK 0x00000200UL
45#define F_ALLOW_BLESSED 0x00000400UL
46#define F_CONV_BLESSED 0x00000800UL
47#define F_RELAXED 0x00001000UL
48#define F_ALLOW_UNKNOWN 0x00002000UL
49#define F_ALLOW_TAGS 0x00004000UL
50#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
16 51
17#define F_DEFAULT 0 52#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
18 53
19#define INIT_SIZE 32 // initial scalar size to be allocated 54#define INIT_SIZE 32 // initial scalar size to be allocated
55#define INDENT_STEP 3 // spaces per indentation level
56
57#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
58
59#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
20 60
21#define SB do { 61#define SB do {
22#define SE } while (0) 62#define SE } while (0)
23 63
24static HV *json_stash; 64#if __GNUC__ >= 3
65# define expect(expr,value) __builtin_expect ((expr), (value))
66# define INLINE static inline
67#else
68# define expect(expr,value) (expr)
69# define INLINE static
70#endif
71
72#define expect_false(expr) expect ((expr) != 0, 0)
73#define expect_true(expr) expect ((expr) != 0, 1)
74
75#define IN_RANGE_INC(type,val,beg,end) \
76 ((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
77 <= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
78
79#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
80
81#ifdef USE_ITHREADS
82# define JSON_SLOW 1
83# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
84# define BOOL_STASH (bool_stash ? bool_stash : gv_stashpv ("Types::Serialiser::Boolean", 1))
85#else
86# define JSON_SLOW 0
87# define JSON_STASH json_stash
88# define BOOL_STASH bool_stash
89#endif
90
91// the amount of HEs to allocate on the stack, when sorting keys
92#define STACK_HES 64
93
94static HV *json_stash, *bool_stash; // JSON::XS::, Types::Serialiser::Boolean::
95static SV *bool_true, *bool_false, *sv_json;
96
97enum {
98 INCR_M_WS = 0, // initial whitespace skipping, must be 0
99 INCR_M_STR, // inside string
100 INCR_M_BS, // inside backslash
101 INCR_M_C0, // inside comment in initial whitespace sequence
102 INCR_M_C1, // inside comment in other places
103 INCR_M_JSON // outside anything, count nesting
104};
105
106#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
107
108typedef struct {
109 U32 flags;
110 U32 max_depth;
111 STRLEN max_size;
112
113 SV *cb_object;
114 HV *cb_sk_object;
115
116 // for the incremental parser
117 SV *incr_text; // the source text so far
118 STRLEN incr_pos; // the current offset into the text
119 int incr_nest; // {[]}-nesting level
120 unsigned char incr_mode;
121} JSON;
122
123INLINE void
124json_init (JSON *json)
125{
126 Zero (json, 1, JSON);
127 json->max_depth = 512;
128}
129
130/////////////////////////////////////////////////////////////////////////////
131// utility functions
132
133INLINE SV *
134get_bool (const char *name)
135{
136 SV *sv = get_sv (name, 1);
137
138 SvREADONLY_on (sv);
139 SvREADONLY_on (SvRV (sv));
140
141 return sv;
142}
143
144INLINE void
145shrink (SV *sv)
146{
147 sv_utf8_downgrade (sv, 1);
148
149 if (SvLEN (sv) > SvCUR (sv) + 1)
150 {
151#ifdef SvPV_shrink_to_cur
152 SvPV_shrink_to_cur (sv);
153#elif defined (SvPV_renew)
154 SvPV_renew (sv, SvCUR (sv) + 1);
155#endif
156 }
157}
158
159// decode an utf-8 character and return it, or (UV)-1 in
160// case of an error.
161// we special-case "safe" characters from U+80 .. U+7FF,
162// but use the very good perl function to parse anything else.
163// note that we never call this function for a ascii codepoints
164INLINE UV
165decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
166{
167 if (expect_true (len >= 2
168 && IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
169 && IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
170 {
171 *clen = 2;
172 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
173 }
174 else
175 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
176}
177
178// likewise for encoding, also never called for ascii codepoints
179// this function takes advantage of this fact, although current gccs
180// seem to optimise the check for >= 0x80 away anyways
181INLINE unsigned char *
182encode_utf8 (unsigned char *s, UV ch)
183{
184 if (expect_false (ch < 0x000080))
185 *s++ = ch;
186 else if (expect_true (ch < 0x000800))
187 *s++ = 0xc0 | ( ch >> 6),
188 *s++ = 0x80 | ( ch & 0x3f);
189 else if ( ch < 0x010000)
190 *s++ = 0xe0 | ( ch >> 12),
191 *s++ = 0x80 | ((ch >> 6) & 0x3f),
192 *s++ = 0x80 | ( ch & 0x3f);
193 else if ( ch < 0x110000)
194 *s++ = 0xf0 | ( ch >> 18),
195 *s++ = 0x80 | ((ch >> 12) & 0x3f),
196 *s++ = 0x80 | ((ch >> 6) & 0x3f),
197 *s++ = 0x80 | ( ch & 0x3f);
198
199 return s;
200}
201
202// convert offset pointer to character index, sv must be string
203static STRLEN
204ptr_to_index (SV *sv, char *offset)
205{
206 return SvUTF8 (sv)
207 ? utf8_distance (offset, SvPVX (sv))
208 : offset - SvPVX (sv);
209}
210
211/////////////////////////////////////////////////////////////////////////////
212// fp hell
213
214// scan a group of digits, and a trailing exponent
215static void
216json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
217{
218 UV uaccum = 0;
219 int eaccum = 0;
220
221 // if we recurse too deep, skip all remaining digits
222 // to avoid a stack overflow attack
223 if (expect_false (--maxdepth <= 0))
224 while (((U8)*s - '0') < 10)
225 ++s;
226
227 for (;;)
228 {
229 U8 dig = (U8)*s - '0';
230
231 if (expect_false (dig >= 10))
232 {
233 if (dig == (U8)((U8)'.' - (U8)'0'))
234 {
235 ++s;
236 json_atof_scan1 (s, accum, expo, 1, maxdepth);
237 }
238 else if ((dig | ' ') == 'e' - '0')
239 {
240 int exp2 = 0;
241 int neg = 0;
242
243 ++s;
244
245 if (*s == '-')
246 {
247 ++s;
248 neg = 1;
249 }
250 else if (*s == '+')
251 ++s;
252
253 while ((dig = (U8)*s - '0') < 10)
254 exp2 = exp2 * 10 + *s++ - '0';
255
256 *expo += neg ? -exp2 : exp2;
257 }
258
259 break;
260 }
261
262 ++s;
263
264 uaccum = uaccum * 10 + dig;
265 ++eaccum;
266
267 // if we have too many digits, then recurse for more
268 // we actually do this for rather few digits
269 if (uaccum >= (UV_MAX - 9) / 10)
270 {
271 if (postdp) *expo -= eaccum;
272 json_atof_scan1 (s, accum, expo, postdp, maxdepth);
273 if (postdp) *expo += eaccum;
274
275 break;
276 }
277 }
278
279 // this relies greatly on the quality of the pow ()
280 // implementation of the platform, but a good
281 // implementation is hard to beat.
282 // (IEEE 754 conformant ones are required to be exact)
283 if (postdp) *expo -= eaccum;
284 *accum += uaccum * Perl_pow (10., *expo);
285 *expo += eaccum;
286}
287
288static NV
289json_atof (const char *s)
290{
291 NV accum = 0.;
292 int expo = 0;
293 int neg = 0;
294
295 if (*s == '-')
296 {
297 ++s;
298 neg = 1;
299 }
300
301 // a recursion depth of ten gives us >>500 bits
302 json_atof_scan1 (s, &accum, &expo, 0, 10);
303
304 return neg ? -accum : accum;
305}
306
307// target of scalar reference is bool? -1 == nope, 0 == false, 1 == true
308static int
309ref_bool_type (SV *sv)
310{
311 svtype svt = SvTYPE (sv);
312
313 if (svt < SVt_PVAV)
314 {
315 STRLEN len = 0;
316 char *pv = svt ? SvPV (sv, len) : 0;
317
318 if (len == 1)
319 if (*pv == '1')
320 return 1;
321 else if (*pv == '0')
322 return 0;
323 }
324
325 return -1;
326}
327
328// returns whether scalar is not a reference in the sense of allow_nonref
329static int
330json_nonref (SV *scalar)
331{
332 if (!SvROK (scalar))
333 return 1;
334
335 scalar = SvRV (scalar);
336
337 if (SvTYPE (scalar) >= SVt_PVMG)
338 {
339 if (SvSTASH (scalar) == bool_stash)
340 return 1;
341
342 if (!SvOBJECT (scalar) && ref_bool_type (scalar) >= 0)
343 return 1;
344 }
345
346 return 0;
347}
348
349/////////////////////////////////////////////////////////////////////////////
350// encoder
25 351
26// structure used for encoding JSON 352// structure used for encoding JSON
27typedef struct 353typedef struct
28{ 354{
29 char *cur; 355 char *cur; // SvPVX (sv) + current output position
30 STRLEN len; // SvLEN (sv)
31 char *end; // SvEND (sv) 356 char *end; // SvEND (sv)
32 SV *sv; 357 SV *sv; // result scalar
33 UV flags; 358 JSON json;
34 int max_recurse; 359 U32 indent; // indentation level
35 int indent; 360 UV limit; // escape character values >= this value when encoding
36} enc_t; 361} enc_t;
37 362
38// structure used for decoding JSON 363INLINE void
39typedef struct
40{
41 char *cur;
42 char *end;
43 char *err;
44 UV flags;
45} dec_t;
46
47static UV *
48SvJSON (SV *sv)
49{
50 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
51 croak ("object is not of type JSON::XS");
52
53 return &SvUVX (SvRV (sv));
54}
55
56/////////////////////////////////////////////////////////////////////////////
57
58static void
59need (enc_t *enc, STRLEN len) 364need (enc_t *enc, STRLEN len)
60{ 365{
61 if (enc->cur + len >= enc->end) 366 if (expect_false (enc->cur + len >= enc->end))
62 { 367 {
63 STRLEN cur = enc->cur - SvPVX (enc->sv); 368 STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
64 SvGROW (enc->sv, cur + len + 1); 369 SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
65 enc->cur = SvPVX (enc->sv) + cur; 370 enc->cur = SvPVX (enc->sv) + cur;
66 enc->end = SvEND (enc->sv); 371 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
67 } 372 }
68} 373}
69 374
70static void 375INLINE void
71encode_ch (enc_t *enc, char ch) 376encode_ch (enc_t *enc, char ch)
72{ 377{
73 need (enc, 1); 378 need (enc, 1);
74 *enc->cur++ = ch; 379 *enc->cur++ = ch;
75} 380}
… …
77static void 382static void
78encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 383encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
79{ 384{
80 char *end = str + len; 385 char *end = str + len;
81 386
387 need (enc, len);
388
82 while (str < end) 389 while (str < end)
83 { 390 {
84 unsigned char ch = *(unsigned char *)str; 391 unsigned char ch = *(unsigned char *)str;
392
85 if (ch >= 0x20 && ch < 0x80) // most common case 393 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
86 { 394 {
395 if (expect_false (ch == '"')) // but with slow exceptions
396 {
397 need (enc, len += 1);
398 *enc->cur++ = '\\';
399 *enc->cur++ = '"';
400 }
401 else if (expect_false (ch == '\\'))
402 {
403 need (enc, len += 1);
404 *enc->cur++ = '\\';
405 *enc->cur++ = '\\';
406 }
407 else
87 *enc->cur++ = ch; 408 *enc->cur++ = ch;
409
88 str++; 410 ++str;
89 } 411 }
90 else 412 else
91 { 413 {
92 STRLEN clen; 414 switch (ch)
93 UV uch;
94
95 if (is_utf8)
96 { 415 {
97 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 416 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
98 if (clen < 0) 417 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
99 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 418 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
100 } 419 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
101 else 420 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
102 {
103 uch = ch;
104 clen = 1;
105 }
106 421
107 need (enc, len += 6); 422 default:
108
109 if (uch < 0xa0 || enc->flags & F_ASCII)
110 {
111 if (uch > 0xFFFFUL)
112 { 423 {
424 STRLEN clen;
425 UV uch;
426
427 if (is_utf8)
428 {
429 uch = decode_utf8 (str, end - str, &clen);
430 if (clen == (STRLEN)-1)
431 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
432 }
433 else
434 {
435 uch = ch;
113 len += 6; 436 clen = 1;
437 }
438
439 if (uch < 0x80/*0x20*/ || uch >= enc->limit)
440 {
441 if (uch >= 0x10000UL)
442 {
443 if (uch >= 0x110000UL)
444 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
445
114 need (enc, len += 6); 446 need (enc, len += 11);
115 sprintf (enc->cur, "\\u%04x\\u%04x", 447 sprintf (enc->cur, "\\u%04x\\u%04x",
116 (uch - 0x10000) / 0x400 + 0xD800, 448 (int)((uch - 0x10000) / 0x400 + 0xD800),
117 (uch - 0x10000) % 0x400 + 0xDC00); 449 (int)((uch - 0x10000) % 0x400 + 0xDC00));
118 enc->cur += 12; 450 enc->cur += 12;
451 }
452 else
453 {
454 need (enc, len += 5);
455 *enc->cur++ = '\\';
456 *enc->cur++ = 'u';
457 *enc->cur++ = PL_hexdigit [ uch >> 12 ];
458 *enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
459 *enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
460 *enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
461 }
462
463 str += clen;
119 } 464 }
465 else if (enc->json.flags & F_LATIN1)
466 {
467 *enc->cur++ = uch;
468 str += clen;
469 }
470 else if (is_utf8)
471 {
472 need (enc, len += clen);
473 do
474 {
475 *enc->cur++ = *str++;
476 }
477 while (--clen);
478 }
120 else 479 else
121 { 480 {
122 sprintf (enc->cur, "\\u%04x", uch); 481 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
123 enc->cur += 6; 482 enc->cur = encode_utf8 (enc->cur, uch);
483 ++str;
484 }
124 } 485 }
125 } 486 }
126 else if (is_utf8)
127 {
128 memcpy (enc->cur, str, clen);
129 enc->cur += clen;
130 }
131 else
132 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
133
134 str += clen;
135 } 487 }
136 488
137 --len; 489 --len;
138 } 490 }
139} 491}
140 492
141#define INDENT SB \ 493INLINE void
494encode_indent (enc_t *enc)
495{
142 if (enc->flags & F_INDENT) \ 496 if (enc->json.flags & F_INDENT)
143 { \ 497 {
144 int i_; \ 498 int spaces = enc->indent * INDENT_STEP;
145 need (enc, enc->indent); \ 499
146 for (i_ = enc->indent * 3; i_--; )\ 500 need (enc, spaces);
501 memset (enc->cur, ' ', spaces);
502 enc->cur += spaces;
503 }
504}
505
506INLINE void
507encode_space (enc_t *enc)
508{
509 need (enc, 1);
510 encode_ch (enc, ' ');
511}
512
513INLINE void
514encode_nl (enc_t *enc)
515{
516 if (enc->json.flags & F_INDENT)
517 {
518 need (enc, 1);
147 encode_ch (enc, ' '); \ 519 encode_ch (enc, '\n');
148 } \ 520 }
149 SE 521}
150 522
151#define SPACE SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, ' '); } SE 523INLINE void
152#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 524encode_comma (enc_t *enc)
153#define COMMA SB \ 525{
154 encode_ch (enc, ','); \ 526 encode_ch (enc, ',');
527
155 if (enc->flags & F_INDENT) \ 528 if (enc->json.flags & F_INDENT)
156 NL; \ 529 encode_nl (enc);
157 else if (enc->flags & F_SPACE_AFTER) \ 530 else if (enc->json.flags & F_SPACE_AFTER)
158 SPACE; \ 531 encode_space (enc);
159 SE 532}
160 533
161static void encode_sv (enc_t *enc, SV *sv); 534static void encode_sv (enc_t *enc, SV *sv);
162 535
163static void 536static void
164encode_av (enc_t *enc, AV *av) 537encode_av (enc_t *enc, AV *av)
165{ 538{
166 int i, len = av_len (av); 539 int i, len = av_len (av);
167 540
541 if (enc->indent >= enc->json.max_depth)
542 croak (ERR_NESTING_EXCEEDED);
543
168 encode_ch (enc, '['); NL; 544 encode_ch (enc, '[');
169 ++enc->indent;
170 545
546 if (len >= 0)
547 {
548 encode_nl (enc); ++enc->indent;
549
171 for (i = 0; i <= len; ++i) 550 for (i = 0; i <= len; ++i)
172 { 551 {
173 INDENT; 552 SV **svp = av_fetch (av, i, 0);
174 encode_sv (enc, *av_fetch (av, i, 0));
175 553
554 encode_indent (enc);
555
556 if (svp)
557 encode_sv (enc, *svp);
558 else
559 encode_str (enc, "null", 4, 0);
560
176 if (i < len) 561 if (i < len)
177 COMMA; 562 encode_comma (enc);
178 } 563 }
179 564
180 NL; 565 encode_nl (enc); --enc->indent; encode_indent (enc);
566 }
181 567
182 --enc->indent;
183 INDENT; encode_ch (enc, ']'); 568 encode_ch (enc, ']');
184} 569}
185 570
186static void 571static void
187encode_he (enc_t *enc, HE *he) 572encode_hk (enc_t *enc, HE *he)
188{ 573{
189 encode_ch (enc, '"'); 574 encode_ch (enc, '"');
190 575
191 if (HeKLEN (he) == HEf_SVKEY) 576 if (HeKLEN (he) == HEf_SVKEY)
192 { 577 {
193 SV *sv = HeSVKEY (he); 578 SV *sv = HeSVKEY (he);
194 STRLEN len; 579 STRLEN len;
580 char *str;
581
582 SvGETMAGIC (sv);
195 char *str = SvPV (sv, len); 583 str = SvPV (sv, len);
196 584
197 encode_str (enc, str, len, SvUTF8 (sv)); 585 encode_str (enc, str, len, SvUTF8 (sv));
198 } 586 }
199 else 587 else
200 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 588 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
201 589
202 encode_ch (enc, '"'); 590 encode_ch (enc, '"');
203 591
204 if (enc->flags & F_SPACE_BEFORE) SPACE; 592 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
205 encode_ch (enc, ':'); 593 encode_ch (enc, ':');
206 if (enc->flags & F_SPACE_AFTER ) SPACE; 594 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
207 encode_sv (enc, HeVAL (he));
208} 595}
209 596
210// compare hash entries, used when all keys are bytestrings 597// compare hash entries, used when all keys are bytestrings
211static int 598static int
212he_cmp_fast (const void *a_, const void *b_) 599he_cmp_fast (const void *a_, const void *b_)
… …
217 HE *b = *(HE **)b_; 604 HE *b = *(HE **)b_;
218 605
219 STRLEN la = HeKLEN (a); 606 STRLEN la = HeKLEN (a);
220 STRLEN lb = HeKLEN (b); 607 STRLEN lb = HeKLEN (b);
221 608
222 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 609 if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
223 cmp = la < lb ? -1 : la == lb ? 0 : 1; 610 cmp = lb - la;
224 611
225 return cmp; 612 return cmp;
226} 613}
227 614
228// compare hash entries, used when some keys are sv's or utf-x 615// compare hash entries, used when some keys are sv's or utf-x
229static int 616static int
230he_cmp_slow (const void *a, const void *b) 617he_cmp_slow (const void *a, const void *b)
231{ 618{
232 return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b)); 619 return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
233} 620}
234 621
235static void 622static void
236encode_hv (enc_t *enc, HV *hv) 623encode_hv (enc_t *enc, HV *hv)
237{ 624{
238 int count, i; 625 HE *he;
239 626
240 encode_ch (enc, '{'); NL; ++enc->indent; 627 if (enc->indent >= enc->json.max_depth)
628 croak (ERR_NESTING_EXCEEDED);
241 629
242 if ((count = hv_iterinit (hv))) 630 encode_ch (enc, '{');
243 { 631
244 // for canonical output we have to sort by keys first 632 // for canonical output we have to sort by keys first
245 // actually, this is mostly due to the stupid so-called 633 // actually, this is mostly due to the stupid so-called
246 // security workaround added somewhere in 5.8.x. 634 // security workaround added somewhere in 5.8.x
247 // that randomises hash orderings 635 // that randomises hash orderings
248 if (enc->flags & F_CANONICAL) 636 if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
637 {
638 int count = hv_iterinit (hv);
639
640 if (SvMAGICAL (hv))
249 { 641 {
250 HE *he, *hes [count]; 642 // need to count by iterating. could improve by dynamically building the vector below
643 // but I don't care for the speed of this special case.
644 // note also that we will run into undefined behaviour when the two iterations
645 // do not result in the same count, something I might care for in some later release.
646
647 count = 0;
648 while (hv_iternext (hv))
649 ++count;
650
651 hv_iterinit (hv);
652 }
653
654 if (count)
655 {
251 int fast = 1; 656 int i, fast = 1;
657 HE *hes_stack [STACK_HES];
658 HE **hes = hes_stack;
659
660 // allocate larger arrays on the heap
661 if (count > STACK_HES)
662 {
663 SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
664 hes = (HE **)SvPVX (sv);
665 }
252 666
253 i = 0; 667 i = 0;
254 while ((he = hv_iternext (hv))) 668 while ((he = hv_iternext (hv)))
255 { 669 {
256 hes [i++] = he; 670 hes [i++] = he;
… …
262 676
263 if (fast) 677 if (fast)
264 qsort (hes, count, sizeof (HE *), he_cmp_fast); 678 qsort (hes, count, sizeof (HE *), he_cmp_fast);
265 else 679 else
266 { 680 {
267 // hack to disable "use bytes" 681 // hack to forcefully disable "use bytes"
268 COP *oldcop = PL_curcop, cop; 682 COP cop = *PL_curcop;
269 cop.op_private = 0; 683 cop.op_private = 0;
684
685 ENTER;
686 SAVETMPS;
687
688 SAVEVPTR (PL_curcop);
270 PL_curcop = &cop; 689 PL_curcop = &cop;
271 690
272 SAVETMPS;
273 qsort (hes, count, sizeof (HE *), he_cmp_slow); 691 qsort (hes, count, sizeof (HE *), he_cmp_slow);
692
274 FREETMPS; 693 FREETMPS;
275 694 LEAVE;
276 PL_curcop = oldcop;
277 } 695 }
278 696
279 for (i = 0; i < count; ++i) 697 encode_nl (enc); ++enc->indent;
698
699 while (count--)
280 { 700 {
281 INDENT; 701 encode_indent (enc);
702 he = hes [count];
282 encode_he (enc, hes [i]); 703 encode_hk (enc, he);
704 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
283 705
284 if (i < count - 1) 706 if (count)
285 COMMA; 707 encode_comma (enc);
286 } 708 }
287 709
288 NL; 710 encode_nl (enc); --enc->indent; encode_indent (enc);
289 } 711 }
712 }
713 else
714 {
715 if (hv_iterinit (hv) || SvMAGICAL (hv))
716 if ((he = hv_iternext (hv)))
717 {
718 encode_nl (enc); ++enc->indent;
719
720 for (;;)
721 {
722 encode_indent (enc);
723 encode_hk (enc, he);
724 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
725
726 if (!(he = hv_iternext (hv)))
727 break;
728
729 encode_comma (enc);
730 }
731
732 encode_nl (enc); --enc->indent; encode_indent (enc);
733 }
734 }
735
736 encode_ch (enc, '}');
737}
738
739// encode objects, arrays and special \0=false and \1=true values.
740static void
741encode_rv (enc_t *enc, SV *sv)
742{
743 svtype svt;
744 GV *method;
745
746 SvGETMAGIC (sv);
747 svt = SvTYPE (sv);
748
749 if (expect_false (SvOBJECT (sv)))
750 {
751 HV *stash = SvSTASH (sv);
752
753 if (stash == bool_stash)
754 {
755 if (SvIV (sv))
756 encode_str (enc, "true", 4, 0);
757 else
758 encode_str (enc, "false", 5, 0);
759 }
760 else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
761 {
762 int count;
763 dSP;
764
765 ENTER; SAVETMPS;
766 SAVESTACK_POS ();
767 PUSHMARK (SP);
768 EXTEND (SP, 2);
769 // we re-bless the reference to get overload and other niceties right
770 PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
771 PUSHs (sv_json);
772
773 PUTBACK;
774 count = call_sv ((SV *)GvCV (method), G_ARRAY);
775 SPAGAIN;
776
777 // catch this surprisingly common error
778 if (SvROK (TOPs) && SvRV (TOPs) == sv)
779 croak ("%s::FREEZE method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
780
781 encode_ch (enc, '(');
782 encode_ch (enc, '"');
783 encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
784 encode_ch (enc, '"');
785 encode_ch (enc, ')');
786 encode_ch (enc, '[');
787
788 while (count)
789 {
790 encode_sv (enc, SP[1 - count--]);
791
792 if (count)
793 encode_ch (enc, ',');
794 }
795
796 encode_ch (enc, ']');
797
798 FREETMPS; LEAVE;
799 }
800 else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
801 {
802 dSP;
803
804 ENTER; SAVETMPS;
805 PUSHMARK (SP);
806 // we re-bless the reference to get overload and other niceties right
807 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
808
809 // calling with G_SCALAR ensures that we always get a 1 return value
810 PUTBACK;
811 call_sv ((SV *)GvCV (method), G_SCALAR);
812 SPAGAIN;
813
814 // catch this surprisingly common error
815 if (SvROK (TOPs) && SvRV (TOPs) == sv)
816 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
817
818 sv = POPs;
819 PUTBACK;
820
821 encode_sv (enc, sv);
822
823 FREETMPS; LEAVE;
824 }
825 else if (enc->json.flags & F_ALLOW_BLESSED)
826 encode_str (enc, "null", 4, 0);
290 else 827 else
291 { 828 croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)",
292 SV *sv; 829 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
293 HE *he = hv_iternext (hv); 830 }
294 831 else if (svt == SVt_PVHV)
295 for (;;) 832 encode_hv (enc, (HV *)sv);
296 { 833 else if (svt == SVt_PVAV)
297 INDENT; 834 encode_av (enc, (AV *)sv);
298 encode_he (enc, he); 835 else if (svt < SVt_PVAV)
299
300 if (!(he = hv_iternext (hv)))
301 break;
302
303 COMMA;
304 }
305
306 NL;
307 }
308 } 836 {
837 int bool_type = ref_bool_type (sv);
309 838
310 --enc->indent; INDENT; encode_ch (enc, '}'); 839 if (bool_type == 1)
840 encode_str (enc, "true", 4, 0);
841 else if (bool_type == 0)
842 encode_str (enc, "false", 5, 0);
843 else if (enc->json.flags & F_ALLOW_UNKNOWN)
844 encode_str (enc, "null", 4, 0);
845 else
846 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
847 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
848 }
849 else if (enc->json.flags & F_ALLOW_UNKNOWN)
850 encode_str (enc, "null", 4, 0);
851 else
852 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
853 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
311} 854}
312 855
313static void 856static void
314encode_sv (enc_t *enc, SV *sv) 857encode_sv (enc_t *enc, SV *sv)
315{ 858{
859 SvGETMAGIC (sv);
860
316 if (SvPOKp (sv)) 861 if (SvPOKp (sv))
317 { 862 {
318 STRLEN len; 863 STRLEN len;
319 char *str = SvPV (sv, len); 864 char *str = SvPV (sv, len);
320 encode_ch (enc, '"'); 865 encode_ch (enc, '"');
321 encode_str (enc, str, len, SvUTF8 (sv)); 866 encode_str (enc, str, len, SvUTF8 (sv));
322 encode_ch (enc, '"'); 867 encode_ch (enc, '"');
323 } 868 }
324 else if (SvNOKp (sv)) 869 else if (SvNOKp (sv))
325 { 870 {
871 // trust that perl will do the right thing w.r.t. JSON syntax.
326 need (enc, NV_DIG + 32); 872 need (enc, NV_DIG + 32);
327 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 873 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
328 enc->cur += strlen (enc->cur); 874 enc->cur += strlen (enc->cur);
329 } 875 }
330 else if (SvIOKp (sv)) 876 else if (SvIOKp (sv))
331 { 877 {
878 // we assume we can always read an IV as a UV and vice versa
879 // we assume two's complement
880 // we assume no aliasing issues in the union
881 if (SvIsUV (sv) ? SvUVX (sv) <= 59000
882 : SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
883 {
884 // optimise the "small number case"
885 // code will likely be branchless and use only a single multiplication
886 // works for numbers up to 59074
887 I32 i = SvIVX (sv);
888 U32 u;
889 char digit, nz = 0;
890
332 need (enc, 64); 891 need (enc, 6);
892
893 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
894 u = i < 0 ? -i : i;
895
896 // convert to 4.28 fixed-point representation
897 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
898
899 // now output digit by digit, each time masking out the integer part
900 // and multiplying by 5 while moving the decimal point one to the right,
901 // resulting in a net multiplication by 10.
902 // we always write the digit to memory but conditionally increment
903 // the pointer, to enable the use of conditional move instructions.
904 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
905 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
906 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
907 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
908 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
909 }
910 else
911 {
912 // large integer, use the (rather slow) snprintf way.
913 need (enc, IVUV_MAXCHARS);
333 enc->cur += 914 enc->cur +=
334 SvIsUV(sv) 915 SvIsUV(sv)
335 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 916 ? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
336 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 917 : snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
918 }
337 } 919 }
338 else if (SvROK (sv)) 920 else if (SvROK (sv))
339 { 921 encode_rv (enc, SvRV (sv));
340 if (!--enc->max_recurse) 922 else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
341 croak ("data structure too deep (hit recursion limit)");
342
343 sv = SvRV (sv);
344
345 switch (SvTYPE (sv))
346 {
347 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
348 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
349
350 default:
351 croak ("JSON can only represent references to arrays or hashes");
352 }
353 }
354 else if (!SvOK (sv))
355 encode_str (enc, "null", 4, 0); 923 encode_str (enc, "null", 4, 0);
356 else 924 else
357 croak ("encountered perl type that JSON cannot handle"); 925 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
926 SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
358} 927}
359 928
360static SV * 929static SV *
361encode_json (SV *scalar, UV flags) 930encode_json (SV *scalar, JSON *json)
362{ 931{
363 enc_t enc; 932 enc_t enc;
364 enc.flags = flags; 933
934 if (!(json->flags & F_ALLOW_NONREF) && json_nonref (scalar))
935 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
936
937 enc.json = *json;
365 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 938 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
366 enc.cur = SvPVX (enc.sv); 939 enc.cur = SvPVX (enc.sv);
367 enc.end = SvEND (enc.sv); 940 enc.end = SvEND (enc.sv);
368 enc.max_recurse = 0;
369 enc.indent = 0; 941 enc.indent = 0;
942 enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
943 : enc.json.flags & F_LATIN1 ? 0x000100UL
944 : 0x110000UL;
370 945
371 SvPOK_only (enc.sv); 946 SvPOK_only (enc.sv);
372 encode_sv (&enc, scalar); 947 encode_sv (&enc, scalar);
948 encode_nl (&enc);
373 949
950 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
951 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
952
374 if (!(flags & (F_ASCII | F_UTF8))) 953 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
375 SvUTF8_on (enc.sv); 954 SvUTF8_on (enc.sv);
376 955
377 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 956 if (enc.json.flags & F_SHRINK)
957 shrink (enc.sv);
958
378 return enc.sv; 959 return enc.sv;
379} 960}
380 961
381///////////////////////////////////////////////////////////////////////////// 962/////////////////////////////////////////////////////////////////////////////
963// decoder
382 964
383#define WS \ 965// structure used for decoding JSON
966typedef struct
967{
968 char *cur; // current parser pointer
969 char *end; // end of input string
970 const char *err; // parse error, if != 0
971 JSON json;
972 U32 depth; // recursion depth
973 U32 maxdepth; // recursion depth limit
974} dec_t;
975
976INLINE void
977decode_comment (dec_t *dec)
978{
979 // only '#'-style comments allowed a.t.m.
980
981 while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
982 ++dec->cur;
983}
984
985INLINE void
986decode_ws (dec_t *dec)
987{
384 for (;;) \ 988 for (;;)
385 { \ 989 {
386 char ch = *dec->cur; \ 990 char ch = *dec->cur;
991
387 if (ch > 0x20 \ 992 if (ch > 0x20)
993 {
994 if (expect_false (ch == '#'))
995 {
996 if (dec->json.flags & F_RELAXED)
997 decode_comment (dec);
998 else
999 break;
1000 }
1001 else
1002 break;
1003 }
388 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 1004 else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
389 break; \ 1005 break; // parse error, but let higher level handle it, gives better error messages
1006
390 ++dec->cur; \ 1007 ++dec->cur;
391 } 1008 }
1009}
392 1010
393#define ERR(reason) SB dec->err = reason; goto fail; SE 1011#define ERR(reason) SB dec->err = reason; goto fail; SE
1012
394#define EXPECT_CH(ch) SB \ 1013#define EXPECT_CH(ch) SB \
395 if (*dec->cur != ch) \ 1014 if (*dec->cur != ch) \
396 ERR (# ch " expected"); \ 1015 ERR (# ch " expected"); \
397 ++dec->cur; \ 1016 ++dec->cur; \
398 SE 1017 SE
399 1018
1019#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
1020#define DEC_DEC_DEPTH --dec->depth
1021
400static SV *decode_sv (dec_t *dec); 1022static SV *decode_sv (dec_t *dec);
401
402#define APPEND_CH(ch) SB \
403 SvGROW (sv, cur + 1 + 1); \
404 SvPVX (sv)[cur++] = (ch); \
405 SE
406 1023
407static signed char decode_hexdigit[256]; 1024static signed char decode_hexdigit[256];
408 1025
409static UV 1026static UV
410decode_4hex (dec_t *dec) 1027decode_4hex (dec_t *dec)
411{ 1028{
412 signed char d1, d2, d3, d4; 1029 signed char d1, d2, d3, d4;
1030 unsigned char *cur = (unsigned char *)dec->cur;
413 1031
414 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 1032 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
415 if (d1 < 0) ERR ("four hexadecimal digits expected"); 1033 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
416 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 1034 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
417 if (d2 < 0) ERR ("four hexadecimal digits expected"); 1035 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
418 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
419 if (d3 < 0) ERR ("four hexadecimal digits expected");
420 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
421 if (d4 < 0) ERR ("four hexadecimal digits expected");
422 1036
423 dec->cur += 4; 1037 dec->cur += 4;
424 1038
425 return ((UV)d1) << 12 1039 return ((UV)d1) << 12
426 | ((UV)d2) << 8 1040 | ((UV)d2) << 8
… …
432} 1046}
433 1047
434static SV * 1048static SV *
435decode_str (dec_t *dec) 1049decode_str (dec_t *dec)
436{ 1050{
437 SV *sv = NEWSV (0,2); 1051 SV *sv = 0;
438 STRLEN cur = 0;
439 int utf8 = 0; 1052 int utf8 = 0;
1053 char *dec_cur = dec->cur;
440 1054
441 for (;;) 1055 do
442 { 1056 {
443 unsigned char ch = *(unsigned char *)dec->cur; 1057 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
1058 char *cur = buf;
444 1059
445 if (ch == '"') 1060 do
446 break;
447 else if (ch == '\\')
448 { 1061 {
449 switch (*++dec->cur) 1062 unsigned char ch = *(unsigned char *)dec_cur++;
1063
1064 if (expect_false (ch == '"'))
450 { 1065 {
451 case '\\': 1066 --dec_cur;
452 case '/': 1067 break;
453 case '"': APPEND_CH (*dec->cur++); break; 1068 }
454 1069 else if (expect_false (ch == '\\'))
455 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 1070 {
456 case 't': APPEND_CH ('\011'); ++dec->cur; break; 1071 switch (*dec_cur)
457 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
458 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
459 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
460
461 case 'u':
462 { 1072 {
463 UV lo, hi; 1073 case '\\':
464 ++dec->cur; 1074 case '/':
1075 case '"': *cur++ = *dec_cur++; break;
465 1076
466 hi = decode_4hex (dec); 1077 case 'b': ++dec_cur; *cur++ = '\010'; break;
467 if (hi == (UV)-1) 1078 case 't': ++dec_cur; *cur++ = '\011'; break;
468 goto fail; 1079 case 'n': ++dec_cur; *cur++ = '\012'; break;
1080 case 'f': ++dec_cur; *cur++ = '\014'; break;
1081 case 'r': ++dec_cur; *cur++ = '\015'; break;
469 1082
470 // possibly a surrogate pair 1083 case 'u':
471 if (hi >= 0xd800 && hi < 0xdc00)
472 { 1084 {
473 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 1085 UV lo, hi;
474 ERR ("illegal surrogate character"); 1086 ++dec_cur;
475 1087
476 dec->cur += 2; 1088 dec->cur = dec_cur;
477
478 lo = decode_4hex (dec); 1089 hi = decode_4hex (dec);
1090 dec_cur = dec->cur;
479 if (lo == (UV)-1) 1091 if (hi == (UV)-1)
480 goto fail; 1092 goto fail;
481 1093
1094 // possibly a surrogate pair
1095 if (hi >= 0xd800)
1096 if (hi < 0xdc00)
1097 {
1098 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
1099 ERR ("missing low surrogate character in surrogate pair");
1100
1101 dec_cur += 2;
1102
1103 dec->cur = dec_cur;
1104 lo = decode_4hex (dec);
1105 dec_cur = dec->cur;
1106 if (lo == (UV)-1)
1107 goto fail;
1108
482 if (lo < 0xdc00 || lo >= 0xe000) 1109 if (lo < 0xdc00 || lo >= 0xe000)
483 ERR ("surrogate pair expected"); 1110 ERR ("surrogate pair expected");
484 1111
485 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 1112 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
1113 }
1114 else if (hi < 0xe000)
1115 ERR ("missing high surrogate character in surrogate pair");
1116
1117 if (hi >= 0x80)
1118 {
1119 utf8 = 1;
1120
1121 cur = encode_utf8 (cur, hi);
1122 }
1123 else
1124 *cur++ = hi;
486 } 1125 }
487 else if (lo >= 0xdc00 && lo < 0xe000)
488 ERR ("illegal surrogate character");
489
490 if (hi >= 0x80)
491 { 1126 break;
492 utf8 = 1;
493 1127
494 SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
495 cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
496 }
497 else 1128 default:
498 APPEND_CH (hi); 1129 --dec_cur;
1130 ERR ("illegal backslash escape sequence in string");
499 } 1131 }
1132 }
1133 else if (expect_true (ch >= 0x20 && ch < 0x80))
1134 *cur++ = ch;
1135 else if (ch >= 0x80)
1136 {
1137 STRLEN clen;
1138
1139 --dec_cur;
1140
1141 decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
1142 if (clen == (STRLEN)-1)
1143 ERR ("malformed UTF-8 character in JSON string");
1144
1145 do
1146 *cur++ = *dec_cur++;
1147 while (--clen);
1148
1149 utf8 = 1;
1150 }
1151 else if (ch == '\t' && dec->json.flags & F_RELAXED)
1152 *cur++ = ch;
1153 else
1154 {
1155 --dec_cur;
1156
1157 if (!ch)
1158 ERR ("unexpected end of string while parsing JSON string");
500 break; 1159 else
1160 ERR ("invalid character encountered while parsing JSON string");
501 } 1161 }
502 } 1162 }
503 else if (ch >= 0x20 && ch <= 0x7f) 1163 while (cur < buf + SHORT_STRING_LEN);
504 APPEND_CH (*dec->cur++); 1164
505 else if (ch >= 0x80) 1165 {
1166 STRLEN len = cur - buf;
1167
1168 if (sv)
506 { 1169 {
507 STRLEN clen; 1170 STRLEN cur = SvCUR (sv);
508 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
509 if (clen < 0)
510 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
511 1171
512 SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits 1172 if (SvLEN (sv) <= cur + len)
513 memcpy (SvPVX (sv) + cur, dec->cur, clen); 1173 SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
514 dec->cur += clen; 1174
1175 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
1176 SvCUR_set (sv, SvCUR (sv) + len);
515 } 1177 }
516 else 1178 else
517 ERR ("invalid character encountered"); 1179 sv = newSVpvn (buf, len);
518 } 1180 }
1181 }
1182 while (*dec_cur != '"');
519 1183
520 ++dec->cur; 1184 ++dec_cur;
521 1185
1186 if (sv)
1187 {
522 SvPOK_only (sv); 1188 SvPOK_only (sv);
523
524 SvCUR_set (sv, cur);
525 *SvEND (sv) = 0; 1189 *SvEND (sv) = 0;
526 1190
527 if (utf8) 1191 if (utf8)
528 SvUTF8_on (sv); 1192 SvUTF8_on (sv);
1193 }
1194 else
1195 sv = newSVpvn ("", 0);
529 1196
1197 dec->cur = dec_cur;
530 return sv; 1198 return sv;
531 1199
532fail: 1200fail:
533 SvREFCNT_dec (sv); 1201 dec->cur = dec_cur;
534 return 0; 1202 return 0;
535} 1203}
536 1204
537static SV * 1205static SV *
538decode_num (dec_t *dec) 1206decode_num (dec_t *dec)
… …
548 { 1216 {
549 ++dec->cur; 1217 ++dec->cur;
550 if (*dec->cur >= '0' && *dec->cur <= '9') 1218 if (*dec->cur >= '0' && *dec->cur <= '9')
551 ERR ("malformed number (leading zero must not be followed by another digit)"); 1219 ERR ("malformed number (leading zero must not be followed by another digit)");
552 } 1220 }
553 1221 else if (*dec->cur < '0' || *dec->cur > '9')
554 // int 1222 ERR ("malformed number (no digits after initial minus)");
1223 else
1224 do
1225 {
1226 ++dec->cur;
1227 }
555 while (*dec->cur >= '0' && *dec->cur <= '9') 1228 while (*dec->cur >= '0' && *dec->cur <= '9');
556 ++dec->cur;
557 1229
558 // [frac] 1230 // [frac]
559 if (*dec->cur == '.') 1231 if (*dec->cur == '.')
560 { 1232 {
561 is_nv = 1; 1233 ++dec->cur;
1234
1235 if (*dec->cur < '0' || *dec->cur > '9')
1236 ERR ("malformed number (no digits after decimal point)");
562 1237
563 do 1238 do
564 { 1239 {
565 ++dec->cur; 1240 ++dec->cur;
566 } 1241 }
567 while (*dec->cur >= '0' && *dec->cur <= '9'); 1242 while (*dec->cur >= '0' && *dec->cur <= '9');
1243
1244 is_nv = 1;
568 } 1245 }
569 1246
570 // [exp] 1247 // [exp]
571 if (*dec->cur == 'e' || *dec->cur == 'E') 1248 if (*dec->cur == 'e' || *dec->cur == 'E')
572 { 1249 {
573 is_nv = 1;
574
575 ++dec->cur; 1250 ++dec->cur;
1251
576 if (*dec->cur == '-' || *dec->cur == '+') 1252 if (*dec->cur == '-' || *dec->cur == '+')
577 ++dec->cur; 1253 ++dec->cur;
578 1254
1255 if (*dec->cur < '0' || *dec->cur > '9')
1256 ERR ("malformed number (no digits after exp sign)");
1257
1258 do
1259 {
1260 ++dec->cur;
1261 }
579 while (*dec->cur >= '0' && *dec->cur <= '9') 1262 while (*dec->cur >= '0' && *dec->cur <= '9');
580 ++dec->cur; 1263
1264 is_nv = 1;
581 } 1265 }
582 1266
583 if (!is_nv) 1267 if (!is_nv)
584 { 1268 {
585 UV uv; 1269 int len = dec->cur - start;
586 int numtype = grok_number (start, dec->cur - start, &uv); 1270
587 if (numtype & IS_NUMBER_IN_UV) 1271 // special case the rather common 1..5-digit-int case
588 if (numtype & IS_NUMBER_NEG) 1272 if (*start == '-')
1273 switch (len)
589 { 1274 {
590 if (uv < (UV)IV_MIN) 1275 case 2: return newSViv (-(IV)( start [1] - '0' * 1));
591 return newSViv (-(IV)uv); 1276 case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
1277 case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
1278 case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
1279 case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
592 } 1280 }
1281 else
1282 switch (len)
1283 {
1284 case 1: return newSViv ( start [0] - '0' * 1);
1285 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
1286 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
1287 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
1288 case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
1289 }
1290
1291 {
1292 UV uv;
1293 int numtype = grok_number (start, len, &uv);
1294 if (numtype & IS_NUMBER_IN_UV)
1295 if (numtype & IS_NUMBER_NEG)
1296 {
1297 if (uv < (UV)IV_MIN)
1298 return newSViv (-(IV)uv);
1299 }
593 else 1300 else
594 return newSVuv (uv); 1301 return newSVuv (uv);
595 } 1302 }
596 1303
1304 len -= *start == '-' ? 1 : 0;
1305
1306 // does not fit into IV or UV, try NV
1307 if (len <= NV_DIG)
1308 // fits into NV without loss of precision
1309 return newSVnv (json_atof (start));
1310
1311 // everything else fails, convert it to a string
1312 return newSVpvn (start, dec->cur - start);
1313 }
1314
1315 // loss of precision here
597 return newSVnv (Atof (start)); 1316 return newSVnv (json_atof (start));
598 1317
599fail: 1318fail:
600 return 0; 1319 return 0;
601} 1320}
602 1321
603static SV * 1322static SV *
604decode_av (dec_t *dec) 1323decode_av (dec_t *dec)
605{ 1324{
606 AV *av = newAV (); 1325 AV *av = newAV ();
607 1326
1327 DEC_INC_DEPTH;
1328 decode_ws (dec);
1329
1330 if (*dec->cur == ']')
1331 ++dec->cur;
1332 else
608 for (;;) 1333 for (;;)
609 { 1334 {
610 SV *value; 1335 SV *value;
611 1336
612 value = decode_sv (dec); 1337 value = decode_sv (dec);
613 if (!value) 1338 if (!value)
614 goto fail; 1339 goto fail;
615 1340
616 av_push (av, value); 1341 av_push (av, value);
617 1342
618 WS; 1343 decode_ws (dec);
619 1344
620 if (*dec->cur == ']') 1345 if (*dec->cur == ']')
621 { 1346 {
622 ++dec->cur; 1347 ++dec->cur;
623 break; 1348 break;
624 } 1349 }
625 1350
626 if (*dec->cur != ',') 1351 if (*dec->cur != ',')
627 ERR (", or ] expected while parsing array"); 1352 ERR (", or ] expected while parsing array");
628 1353
629 ++dec->cur; 1354 ++dec->cur;
1355
1356 decode_ws (dec);
1357
1358 if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
1359 {
1360 ++dec->cur;
1361 break;
1362 }
630 } 1363 }
631 1364
1365 DEC_DEC_DEPTH;
632 return newRV_noinc ((SV *)av); 1366 return newRV_noinc ((SV *)av);
633 1367
634fail: 1368fail:
635 SvREFCNT_dec (av); 1369 SvREFCNT_dec (av);
1370 DEC_DEC_DEPTH;
636 return 0; 1371 return 0;
637} 1372}
638 1373
639static SV * 1374static SV *
640decode_hv (dec_t *dec) 1375decode_hv (dec_t *dec)
641{ 1376{
1377 SV *sv;
642 HV *hv = newHV (); 1378 HV *hv = newHV ();
643 1379
1380 DEC_INC_DEPTH;
1381 decode_ws (dec);
1382
1383 if (*dec->cur == '}')
1384 ++dec->cur;
1385 else
644 for (;;) 1386 for (;;)
645 { 1387 {
646 SV *key, *value;
647
648 WS; EXPECT_CH ('"'); 1388 EXPECT_CH ('"');
649 1389
650 key = decode_str (dec); 1390 // heuristic: assume that
651 if (!key) 1391 // a) decode_str + hv_store_ent are abysmally slow.
652 goto fail; 1392 // b) most hash keys are short, simple ascii text.
653 1393 // => try to "fast-match" such strings to avoid
654 WS; EXPECT_CH (':'); 1394 // the overhead of decode_str + hv_store_ent.
655
656 value = decode_sv (dec);
657 if (!value)
658 { 1395 {
1396 SV *value;
1397 char *p = dec->cur;
1398 char *e = p + 24; // only try up to 24 bytes
1399
1400 for (;;)
1401 {
1402 // the >= 0x80 is false on most architectures
1403 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1404 {
1405 // slow path, back up and use decode_str
1406 SV *key = decode_str (dec);
1407 if (!key)
1408 goto fail;
1409
1410 decode_ws (dec); EXPECT_CH (':');
1411
1412 decode_ws (dec);
1413 value = decode_sv (dec);
1414 if (!value)
1415 {
1416 SvREFCNT_dec (key);
1417 goto fail;
1418 }
1419
1420 hv_store_ent (hv, key, value, 0);
659 SvREFCNT_dec (key); 1421 SvREFCNT_dec (key);
1422
1423 break;
1424 }
1425 else if (*p == '"')
1426 {
1427 // fast path, got a simple key
1428 char *key = dec->cur;
1429 int len = p - key;
1430 dec->cur = p + 1;
1431
1432 decode_ws (dec); EXPECT_CH (':');
1433
1434 decode_ws (dec);
1435 value = decode_sv (dec);
1436 if (!value)
660 goto fail; 1437 goto fail;
1438
1439 hv_store (hv, key, len, value, 0);
1440
1441 break;
1442 }
1443
1444 ++p;
1445 }
661 } 1446 }
662 1447
663 //TODO: optimise 1448 decode_ws (dec);
664 hv_store_ent (hv, key, value, 0);
665 1449
666 WS;
667
668 if (*dec->cur == '}') 1450 if (*dec->cur == '}')
1451 {
1452 ++dec->cur;
1453 break;
1454 }
1455
1456 if (*dec->cur != ',')
1457 ERR (", or } expected while parsing object/hash");
1458
1459 ++dec->cur;
1460
1461 decode_ws (dec);
1462
1463 if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
1464 {
1465 ++dec->cur;
1466 break;
1467 }
1468 }
1469
1470 DEC_DEC_DEPTH;
1471 sv = newRV_noinc ((SV *)hv);
1472
1473 // check filter callbacks
1474 if (dec->json.flags & F_HOOK)
1475 {
1476 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
669 { 1477 {
670 ++dec->cur; 1478 HE *cb, *he;
671 break; 1479
1480 hv_iterinit (hv);
1481 he = hv_iternext (hv);
1482 hv_iterinit (hv);
1483
1484 // the next line creates a mortal sv each time it's called.
1485 // might want to optimise this for common cases.
1486 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1487
1488 if (cb)
1489 {
1490 dSP;
1491 int count;
1492
1493 ENTER; SAVETMPS;
1494 SAVESTACK_POS ();
1495 PUSHMARK (SP);
1496 XPUSHs (HeVAL (he));
1497 sv_2mortal (sv);
1498
1499 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1500
1501 if (count == 1)
1502 {
1503 sv = newSVsv (POPs);
1504 FREETMPS; LEAVE;
1505 return sv;
1506 }
1507
1508 SvREFCNT_inc (sv);
1509 FREETMPS; LEAVE;
1510 }
672 } 1511 }
673 1512
674 if (*dec->cur != ',') 1513 if (dec->json.cb_object)
675 ERR (", or } expected while parsing object/hash"); 1514 {
1515 dSP;
1516 int count;
676 1517
677 ++dec->cur; 1518 ENTER; SAVETMPS;
678 } 1519 SAVESTACK_POS ();
1520 PUSHMARK (SP);
1521 XPUSHs (sv_2mortal (sv));
679 1522
680 return newRV_noinc ((SV *)hv); 1523 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1524
1525 if (count == 1)
1526 {
1527 sv = newSVsv (POPs);
1528 FREETMPS; LEAVE;
1529 return sv;
1530 }
1531
1532 SvREFCNT_inc (sv);
1533 FREETMPS; LEAVE;
1534 }
1535 }
1536
1537 return sv;
681 1538
682fail: 1539fail:
683 SvREFCNT_dec (hv); 1540 SvREFCNT_dec (hv);
1541 DEC_DEC_DEPTH;
1542 return 0;
1543}
1544
1545static SV *
1546decode_tag (dec_t *dec)
1547{
1548 SV *tag = 0;
1549 SV *val = 0;
1550
1551 if (!(dec->json.flags & F_ALLOW_TAGS))
1552 ERR ("malformed JSON string, neither array, object, number, string or atom");
1553
1554 ++dec->cur;
1555
1556 decode_ws (dec);
1557
1558 tag = decode_sv (dec);
1559 if (!tag)
1560 goto fail;
1561
1562 if (!SvPOK (tag))
1563 ERR ("malformed JSON string, (tag) must be a string");
1564
1565 decode_ws (dec);
1566
1567 if (*dec->cur != ')')
1568 ERR (") expected after tag");
1569
1570 ++dec->cur;
1571
1572 decode_ws (dec);
1573
1574 val = decode_sv (dec);
1575 if (!val)
1576 goto fail;
1577
1578 if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
1579 ERR ("malformed JSON string, tag value must be an array");
1580
1581 {
1582 AV *av = (AV *)SvRV (val);
1583 int i, len = av_len (av) + 1;
1584 HV *stash = gv_stashsv (tag, 0);
1585 SV *sv;
1586
1587 if (!stash)
1588 ERR ("cannot decode perl-object (package does not exist)");
1589
1590 GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
1591
1592 if (!method)
1593 ERR ("cannot decode perl-object (package does not have a THAW method)");
1594
1595 dSP;
1596
1597 ENTER; SAVETMPS;
1598 PUSHMARK (SP);
1599 EXTEND (SP, len + 2);
1600 // we re-bless the reference to get overload and other niceties right
1601 PUSHs (tag);
1602 PUSHs (sv_json);
1603
1604 for (i = 0; i < len; ++i)
1605 PUSHs (*av_fetch (av, i, 1));
1606
1607 PUTBACK;
1608 call_sv ((SV *)GvCV (method), G_SCALAR);
1609 SPAGAIN;
1610
1611 SvREFCNT_dec (tag);
1612 SvREFCNT_dec (val);
1613 sv = SvREFCNT_inc (POPs);
1614
1615 PUTBACK;
1616
1617 FREETMPS; LEAVE;
1618
1619 return sv;
1620 }
1621
1622fail:
1623 SvREFCNT_dec (tag);
1624 SvREFCNT_dec (val);
684 return 0; 1625 return 0;
685} 1626}
686 1627
687static SV * 1628static SV *
688decode_sv (dec_t *dec) 1629decode_sv (dec_t *dec)
689{ 1630{
690 WS; 1631 // the beauty of JSON: you need exactly one character lookahead
1632 // to parse everything.
691 switch (*dec->cur) 1633 switch (*dec->cur)
692 { 1634 {
693 case '"': ++dec->cur; return decode_str (dec); 1635 case '"': ++dec->cur; return decode_str (dec);
694 case '[': ++dec->cur; return decode_av (dec); 1636 case '[': ++dec->cur; return decode_av (dec);
695 case '{': ++dec->cur; return decode_hv (dec); 1637 case '{': ++dec->cur; return decode_hv (dec);
1638 case '(': return decode_tag (dec);
696 1639
697 case '-': 1640 case '-':
698 case '0': case '1': case '2': case '3': case '4': 1641 case '0': case '1': case '2': case '3': case '4':
699 case '5': case '6': case '7': case '8': case '9': 1642 case '5': case '6': case '7': case '8': case '9':
700 return decode_num (dec); 1643 return decode_num (dec);
701 1644
702 case 't': 1645 case 't':
703 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1646 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
704 { 1647 {
705 dec->cur += 4; 1648 dec->cur += 4;
1649#if JSON_SLOW
1650 bool_true = get_bool ("Types::Serialiser::true");
1651#endif
706 return newSViv (1); 1652 return newSVsv (bool_true);
707 } 1653 }
708 else 1654 else
709 ERR ("'true' expected"); 1655 ERR ("'true' expected");
710 1656
711 break; 1657 break;
712 1658
713 case 'f': 1659 case 'f':
714 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1660 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
715 { 1661 {
716 dec->cur += 5; 1662 dec->cur += 5;
1663#if JSON_SLOW
1664 bool_false = get_bool ("Types::Serialiser::false");
1665#endif
717 return newSViv (0); 1666 return newSVsv (bool_false);
718 } 1667 }
719 else 1668 else
720 ERR ("'false' expected"); 1669 ERR ("'false' expected");
721 1670
722 break; 1671 break;
723 1672
724 case 'n': 1673 case 'n':
725 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1674 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
726 { 1675 {
727 dec->cur += 4; 1676 dec->cur += 4;
728 return newSViv (1); 1677 return newSVsv (&PL_sv_undef);
729 } 1678 }
730 else 1679 else
731 ERR ("'null' expected"); 1680 ERR ("'null' expected");
732 1681
733 break; 1682 break;
734 1683
735 default: 1684 default:
736 ERR ("malformed json string"); 1685 ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
737 break; 1686 break;
738 } 1687 }
739 1688
740fail: 1689fail:
741 return 0; 1690 return 0;
742} 1691}
743 1692
744static SV * 1693static SV *
745decode_json (SV *string, UV flags) 1694decode_json (SV *string, JSON *json, char **offset_return)
746{ 1695{
1696 dec_t dec;
747 SV *sv; 1697 SV *sv;
748 1698
749 if (!(flags & F_UTF8)) 1699 /* work around bugs in 5.10 where manipulating magic values
1700 * makes perl ignore the magic in subsequent accesses.
1701 * also make a copy of non-PV values, to get them into a clean
1702 * state (SvPV should do that, but it's buggy, see below).
1703 *
1704 * SvIsCOW_shared_hash works around a bug in perl (possibly 5.16),
1705 * as reported by Reini Urban.
1706 */
1707 /*SvGETMAGIC (string);*/
1708 if (SvMAGICAL (string) || !SvPOK (string) || SvIsCOW_shared_hash (string))
1709 string = sv_2mortal (newSVsv (string));
1710
1711 SvUPGRADE (string, SVt_PV);
1712
1713 /* work around a bug in perl 5.10, which causes SvCUR to fail an
1714 * assertion with -DDEBUGGING, although SvCUR is documented to
1715 * return the xpv_cur field which certainly exists after upgrading.
1716 * according to nicholas clark, calling SvPOK fixes this.
1717 * But it doesn't fix it, so try another workaround, call SvPV_nolen
1718 * and hope for the best.
1719 * Damnit, SvPV_nolen still trips over yet another assertion. This
1720 * assertion business is seriously broken, try yet another workaround
1721 * for the broken -DDEBUGGING.
1722 */
1723 {
1724#ifdef DEBUGGING
1725 STRLEN offset = SvOK (string) ? sv_len (string) : 0;
1726#else
1727 STRLEN offset = SvCUR (string);
1728#endif
1729
1730 if (offset > json->max_size && json->max_size)
1731 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1732 (unsigned long)SvCUR (string), (unsigned long)json->max_size);
1733 }
1734
1735 if (DECODE_WANTS_OCTETS (json))
1736 sv_utf8_downgrade (string, 0);
1737 else
750 sv_utf8_upgrade (string); 1738 sv_utf8_upgrade (string);
751 1739
752 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1740 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
753 1741
754 dec_t dec; 1742 dec.json = *json;
755 dec.flags = flags;
756 dec.cur = SvPVX (string); 1743 dec.cur = SvPVX (string);
757 dec.end = SvEND (string); 1744 dec.end = SvEND (string);
758 dec.err = 0; 1745 dec.err = 0;
1746 dec.depth = 0;
759 1747
760 *dec.end = 1; // invalid anywhere 1748 if (dec.json.cb_object || dec.json.cb_sk_object)
1749 dec.json.flags |= F_HOOK;
1750
1751 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
1752
1753 decode_ws (&dec);
761 sv = decode_sv (&dec); 1754 sv = decode_sv (&dec);
762 *dec.end = 0; 1755
1756 if (offset_return)
1757 *offset_return = dec.cur;
1758
1759 if (!(offset_return || !sv))
1760 {
1761 // check for trailing garbage
1762 decode_ws (&dec);
1763
1764 if (*dec.cur)
1765 {
1766 dec.err = "garbage after JSON object";
1767 SvREFCNT_dec (sv);
1768 sv = 0;
1769 }
1770 }
763 1771
764 if (!sv) 1772 if (!sv)
765 { 1773 {
766 IV offset = utf8_distance (dec.cur, SvPVX (string));
767 SV *uni = sv_newmortal (); 1774 SV *uni = sv_newmortal ();
768 1775
1776 // horrible hack to silence warning inside pv_uni_display
1777 COP cop = *PL_curcop;
1778 cop.cop_warnings = pWARN_NONE;
1779 ENTER;
1780 SAVEVPTR (PL_curcop);
1781 PL_curcop = &cop;
769 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1782 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1783 LEAVE;
1784
770 croak ("%s, at character %d (%s)", 1785 croak ("%s, at character offset %d (before \"%s\")",
771 dec.err, 1786 dec.err,
772 (int)offset, 1787 (int)ptr_to_index (string, dec.cur),
773 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1788 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
774 } 1789 }
775 1790
776 sv_dump (sv);//D
777 return sv_2mortal (sv); 1791 sv = sv_2mortal (sv);
1792
1793 if (!(dec.json.flags & F_ALLOW_NONREF) && json_nonref (sv))
1794 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1795
1796 return sv;
778} 1797}
1798
1799/////////////////////////////////////////////////////////////////////////////
1800// incremental parser
1801
1802static void
1803incr_parse (JSON *self)
1804{
1805 const char *p = SvPVX (self->incr_text) + self->incr_pos;
1806
1807 // the state machine here is a bit convoluted and could be simplified a lot
1808 // but this would make it slower, so...
1809
1810 for (;;)
1811 {
1812 //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
1813 switch (self->incr_mode)
1814 {
1815 // only used for initial whitespace skipping
1816 case INCR_M_WS:
1817 for (;;)
1818 {
1819 if (*p > 0x20)
1820 {
1821 if (*p == '#')
1822 {
1823 self->incr_mode = INCR_M_C0;
1824 goto incr_m_c;
1825 }
1826 else
1827 {
1828 self->incr_mode = INCR_M_JSON;
1829 goto incr_m_json;
1830 }
1831 }
1832 else if (!*p)
1833 goto interrupt;
1834
1835 ++p;
1836 }
1837
1838 // skip a single char inside a string (for \\-processing)
1839 case INCR_M_BS:
1840 if (!*p)
1841 goto interrupt;
1842
1843 ++p;
1844 self->incr_mode = INCR_M_STR;
1845 goto incr_m_str;
1846
1847 // inside #-style comments
1848 case INCR_M_C0:
1849 case INCR_M_C1:
1850 incr_m_c:
1851 for (;;)
1852 {
1853 if (*p == '\n')
1854 {
1855 self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
1856 break;
1857 }
1858 else if (!*p)
1859 goto interrupt;
1860
1861 ++p;
1862 }
1863
1864 break;
1865
1866 // inside a string
1867 case INCR_M_STR:
1868 incr_m_str:
1869 for (;;)
1870 {
1871 if (*p == '"')
1872 {
1873 ++p;
1874 self->incr_mode = INCR_M_JSON;
1875
1876 if (!self->incr_nest)
1877 goto interrupt;
1878
1879 goto incr_m_json;
1880 }
1881 else if (*p == '\\')
1882 {
1883 ++p; // "virtually" consumes character after \
1884
1885 if (!*p) // if at end of string we have to switch modes
1886 {
1887 self->incr_mode = INCR_M_BS;
1888 goto interrupt;
1889 }
1890 }
1891 else if (!*p)
1892 goto interrupt;
1893
1894 ++p;
1895 }
1896
1897 // after initial ws, outside string
1898 case INCR_M_JSON:
1899 incr_m_json:
1900 for (;;)
1901 {
1902 switch (*p++)
1903 {
1904 case 0:
1905 --p;
1906 goto interrupt;
1907
1908 case 0x09:
1909 case 0x0a:
1910 case 0x0d:
1911 case 0x20:
1912 if (!self->incr_nest)
1913 {
1914 --p; // do not eat the whitespace, let the next round do it
1915 goto interrupt;
1916 }
1917 break;
1918
1919 case '"':
1920 self->incr_mode = INCR_M_STR;
1921 goto incr_m_str;
1922
1923 case '[':
1924 case '{':
1925 case '(':
1926 if (++self->incr_nest > self->max_depth)
1927 croak (ERR_NESTING_EXCEEDED);
1928 break;
1929
1930 case ']':
1931 case '}':
1932 if (--self->incr_nest <= 0)
1933 goto interrupt;
1934 break;
1935
1936 case ')':
1937 --self->incr_nest;
1938 break;
1939
1940 case '#':
1941 self->incr_mode = INCR_M_C1;
1942 goto incr_m_c;
1943 }
1944 }
1945 }
1946
1947 modechange:
1948 ;
1949 }
1950
1951interrupt:
1952 self->incr_pos = p - SvPVX (self->incr_text);
1953 //printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
1954 //printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
1955}
1956
1957/////////////////////////////////////////////////////////////////////////////
1958// XS interface functions
779 1959
780MODULE = JSON::XS PACKAGE = JSON::XS 1960MODULE = JSON::XS PACKAGE = JSON::XS
781 1961
782BOOT: 1962BOOT:
783{ 1963{
784 int i; 1964 int i;
785 1965
786 memset (decode_hexdigit, 0xff, 256);
787 for (i = 10; i--; ) 1966 for (i = 0; i < 256; ++i)
788 decode_hexdigit ['0' + i] = i; 1967 decode_hexdigit [i] =
1968 i >= '0' && i <= '9' ? i - '0'
1969 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1970 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1971 : -1;
789 1972
790 for (i = 6; --i; )
791 {
792 decode_hexdigit ['a' + i] = 10 + i;
793 decode_hexdigit ['A' + i] = 10 + i;
794 }
795
796 json_stash = gv_stashpv ("JSON::XS", 1); 1973 json_stash = gv_stashpv ("JSON::XS" , 1);
797} 1974 bool_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
1975 bool_true = get_bool ("Types::Serialiser::true");
1976 bool_false = get_bool ("Types::Serialiser::false");
798 1977
799SV *new (char *dummy) 1978 sv_json = newSVpv ("JSON", 0);
1979 SvREADONLY_on (sv_json);
1980
1981 CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
1982}
1983
1984PROTOTYPES: DISABLE
1985
1986void CLONE (...)
800 CODE: 1987 CODE:
801 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1988 json_stash = 0;
1989 bool_stash = 0;
1990
1991void new (char *klass)
1992 PPCODE:
1993{
1994 SV *pv = NEWSV (0, sizeof (JSON));
1995 SvPOK_only (pv);
1996 json_init ((JSON *)SvPVX (pv));
1997 XPUSHs (sv_2mortal (sv_bless (
1998 newRV_noinc (pv),
1999 strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
2000 )));
2001}
2002
2003void ascii (JSON *self, int enable = 1)
2004 ALIAS:
2005 ascii = F_ASCII
2006 latin1 = F_LATIN1
2007 utf8 = F_UTF8
2008 indent = F_INDENT
2009 canonical = F_CANONICAL
2010 space_before = F_SPACE_BEFORE
2011 space_after = F_SPACE_AFTER
2012 pretty = F_PRETTY
2013 allow_nonref = F_ALLOW_NONREF
2014 shrink = F_SHRINK
2015 allow_blessed = F_ALLOW_BLESSED
2016 convert_blessed = F_CONV_BLESSED
2017 relaxed = F_RELAXED
2018 allow_unknown = F_ALLOW_UNKNOWN
2019 allow_tags = F_ALLOW_TAGS
2020 PPCODE:
2021{
2022 if (enable)
2023 self->flags |= ix;
2024 else
2025 self->flags &= ~ix;
2026
2027 XPUSHs (ST (0));
2028}
2029
2030void get_ascii (JSON *self)
2031 ALIAS:
2032 get_ascii = F_ASCII
2033 get_latin1 = F_LATIN1
2034 get_utf8 = F_UTF8
2035 get_indent = F_INDENT
2036 get_canonical = F_CANONICAL
2037 get_space_before = F_SPACE_BEFORE
2038 get_space_after = F_SPACE_AFTER
2039 get_allow_nonref = F_ALLOW_NONREF
2040 get_shrink = F_SHRINK
2041 get_allow_blessed = F_ALLOW_BLESSED
2042 get_convert_blessed = F_CONV_BLESSED
2043 get_relaxed = F_RELAXED
2044 get_allow_unknown = F_ALLOW_UNKNOWN
2045 get_allow_tags = F_ALLOW_TAGS
2046 PPCODE:
2047 XPUSHs (boolSV (self->flags & ix));
2048
2049void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
2050 PPCODE:
2051 self->max_depth = max_depth;
2052 XPUSHs (ST (0));
2053
2054U32 get_max_depth (JSON *self)
2055 CODE:
2056 RETVAL = self->max_depth;
802 OUTPUT: 2057 OUTPUT:
803 RETVAL 2058 RETVAL
804 2059
805SV *ascii (SV *self, int enable) 2060void max_size (JSON *self, U32 max_size = 0)
806 ALIAS: 2061 PPCODE:
807 ascii = F_ASCII 2062 self->max_size = max_size;
808 utf8 = F_UTF8 2063 XPUSHs (ST (0));
809 indent = F_INDENT 2064
810 canonical = F_CANONICAL 2065int get_max_size (JSON *self)
811 space_before = F_SPACE_BEFORE
812 space_after = F_SPACE_AFTER
813 json_rpc = F_JSON_RPC
814 CODE: 2066 CODE:
815{ 2067 RETVAL = self->max_size;
816 UV *uv = SvJSON (self);
817 if (enable)
818 *uv |= ix;
819 else
820 *uv &= ~ix;
821
822 RETVAL = newSVsv (self);
823}
824 OUTPUT: 2068 OUTPUT:
825 RETVAL 2069 RETVAL
826 2070
827void encode (SV *self, SV *scalar) 2071void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
828 PPCODE: 2072 PPCODE:
829 XPUSHs (encode_json (scalar, *SvJSON (self))); 2073{
2074 SvREFCNT_dec (self->cb_object);
2075 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
830 2076
831void decode (SV *self, SV *jsondata) 2077 XPUSHs (ST (0));
2078}
2079
2080void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
832 PPCODE: 2081 PPCODE:
833 XPUSHs (decode_json (jsondata, *SvJSON (self))); 2082{
2083 if (!self->cb_sk_object)
2084 self->cb_sk_object = newHV ();
834 2085
2086 if (SvOK (cb))
2087 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
2088 else
2089 {
2090 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
2091
2092 if (!HvKEYS (self->cb_sk_object))
2093 {
2094 SvREFCNT_dec (self->cb_sk_object);
2095 self->cb_sk_object = 0;
2096 }
2097 }
2098
2099 XPUSHs (ST (0));
2100}
2101
2102void encode (JSON *self, SV *scalar)
2103 PPCODE:
2104 PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
2105 XPUSHs (scalar);
2106
2107void decode (JSON *self, SV *jsonstr)
2108 PPCODE:
2109 PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
2110 XPUSHs (jsonstr);
2111
2112void decode_prefix (JSON *self, SV *jsonstr)
2113 PPCODE:
2114{
2115 SV *sv;
2116 char *offset;
2117 PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
2118 EXTEND (SP, 2);
2119 PUSHs (sv);
2120 PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
2121}
2122
2123void incr_parse (JSON *self, SV *jsonstr = 0)
2124 PPCODE:
2125{
2126 if (!self->incr_text)
2127 self->incr_text = newSVpvn ("", 0);
2128
2129 /* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
2130 if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
2131 if (DECODE_WANTS_OCTETS (self))
2132 {
2133 if (self->incr_pos)
2134 self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
2135 (U8 *)SvPVX (self->incr_text) + self->incr_pos);
2136
2137 sv_utf8_downgrade (self->incr_text, 0);
2138 }
2139 else
2140 {
2141 sv_utf8_upgrade (self->incr_text);
2142
2143 if (self->incr_pos)
2144 self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
2145 - (U8 *)SvPVX (self->incr_text);
2146 }
2147
2148 // append data, if any
2149 if (jsonstr)
2150 {
2151 /* make sure both strings have same encoding */
2152 if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
2153 if (SvUTF8 (jsonstr))
2154 sv_utf8_downgrade (jsonstr, 0);
2155 else
2156 sv_utf8_upgrade (jsonstr);
2157
2158 /* and then just blindly append */
2159 {
2160 STRLEN len;
2161 const char *str = SvPV (jsonstr, len);
2162 STRLEN cur = SvCUR (self->incr_text);
2163
2164 if (SvLEN (self->incr_text) <= cur + len)
2165 SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
2166
2167 Move (str, SvEND (self->incr_text), len, char);
2168 SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
2169 *SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
2170 }
2171 }
2172
2173 if (GIMME_V != G_VOID)
2174 do
2175 {
2176 SV *sv;
2177 char *offset;
2178
2179 if (!INCR_DONE (self))
2180 {
2181 incr_parse (self);
2182
2183 if (self->incr_pos > self->max_size && self->max_size)
2184 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
2185 (unsigned long)self->incr_pos, (unsigned long)self->max_size);
2186
2187 if (!INCR_DONE (self))
2188 {
2189 // as an optimisation, do not accumulate white space in the incr buffer
2190 if (self->incr_mode == INCR_M_WS && self->incr_pos)
2191 {
2192 self->incr_pos = 0;
2193 SvCUR_set (self->incr_text, 0);
2194 }
2195
2196 break;
2197 }
2198 }
2199
2200 PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
2201 XPUSHs (sv);
2202
2203 self->incr_pos -= offset - SvPVX (self->incr_text);
2204 self->incr_nest = 0;
2205 self->incr_mode = 0;
2206
2207 sv_chop (self->incr_text, offset);
2208 }
2209 while (GIMME_V == G_ARRAY);
2210}
2211
2212SV *incr_text (JSON *self)
2213 ATTRS: lvalue
2214 CODE:
2215{
2216 if (self->incr_pos)
2217 croak ("incr_text can not be called when the incremental parser already started parsing");
2218
2219 RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
2220}
2221 OUTPUT:
2222 RETVAL
2223
2224void incr_skip (JSON *self)
2225 CODE:
2226{
2227 if (self->incr_pos)
2228 {
2229 sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
2230 self->incr_pos = 0;
2231 self->incr_nest = 0;
2232 self->incr_mode = 0;
2233 }
2234}
2235
2236void incr_reset (JSON *self)
2237 CODE:
2238{
2239 SvREFCNT_dec (self->incr_text);
2240 self->incr_text = 0;
2241 self->incr_pos = 0;
2242 self->incr_nest = 0;
2243 self->incr_mode = 0;
2244}
2245
2246void DESTROY (JSON *self)
2247 CODE:
2248 SvREFCNT_dec (self->cb_sk_object);
2249 SvREFCNT_dec (self->cb_object);
2250 SvREFCNT_dec (self->incr_text);
2251
2252PROTOTYPES: ENABLE
2253
2254void encode_json (SV *scalar)
2255 PPCODE:
2256{
2257 JSON json;
2258 json_init (&json);
2259 json.flags |= F_UTF8;
2260 PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
2261 XPUSHs (scalar);
2262}
2263
2264void decode_json (SV *jsonstr)
2265 PPCODE:
2266{
2267 JSON json;
2268 json_init (&json);
2269 json.flags |= F_UTF8;
2270 PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
2271 XPUSHs (jsonstr);
2272}
2273

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines