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Comparing JSON-XS/XS.xs (file contents):
Revision 1.6 by root, Fri Mar 23 15:10:55 2007 UTC vs.
Revision 1.59 by root, Mon Aug 13 16:14:20 2007 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 <float.h>
8 10
11#if defined(__BORLANDC__) || defined(_MSC_VER)
12# define snprintf _snprintf // C compilers have this in stdio.h
13#endif
14
15// some old perls do not have this, try to make it work, no
16// guarentees, though. if it breaks, you get to keep the pieces.
17#ifndef UTF8_MAXBYTES
18# define UTF8_MAXBYTES 13
19#endif
20
9#define F_ASCII 0x00000001 21#define F_ASCII 0x00000001UL
22#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 23#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 24#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 25#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 26#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 27#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040
16#define F_ALLOW_NONREF 0x00000080 28#define F_ALLOW_NONREF 0x00000100UL
17#define F_SHRINK 0x00000100 29#define F_SHRINK 0x00000200UL
30#define F_ALLOW_BLESSED 0x00000400UL
31#define F_CONV_BLESSED 0x00000800UL
32#define F_MAXDEPTH 0xf8000000UL
33#define S_MAXDEPTH 27
34#define F_MAXSIZE 0x01f00000UL
35#define S_MAXSIZE 20
36#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
37
38#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
39#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
18 40
19#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 41#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20#define F_DEFAULT 0 42#define F_DEFAULT (9UL << S_MAXDEPTH)
21 43
22#define INIT_SIZE 32 // initial scalar size to be allocated 44#define INIT_SIZE 32 // initial scalar size to be allocated
45#define INDENT_STEP 3 // spaces per indentation level
46
47#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23 48
24#define SB do { 49#define SB do {
25#define SE } while (0) 50#define SE } while (0)
26 51
27static HV *json_stash; 52#if __GNUC__ >= 3
53# define expect(expr,value) __builtin_expect ((expr),(value))
54# define inline inline
55#else
56# define expect(expr,value) (expr)
57# define inline static
58#endif
59
60#define expect_false(expr) expect ((expr) != 0, 0)
61#define expect_true(expr) expect ((expr) != 0, 1)
62
63#ifdef USE_ITHREADS
64# define JSON_SLOW 1
65# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
66#else
67# define JSON_SLOW 0
68# define JSON_STASH json_stash
69#endif
70
71static HV *json_stash, *json_boolean_stash; // JSON::XS::
72static SV *json_true, *json_false;
73
74typedef struct {
75 U32 flags;
76 SV *cb_object;
77 HV *cb_sk_object;
78} JSON;
79
80/////////////////////////////////////////////////////////////////////////////
81// utility functions
82
83inline void
84shrink (SV *sv)
85{
86 sv_utf8_downgrade (sv, 1);
87 if (SvLEN (sv) > SvCUR (sv) + 1)
88 {
89#ifdef SvPV_shrink_to_cur
90 SvPV_shrink_to_cur (sv);
91#elif defined (SvPV_renew)
92 SvPV_renew (sv, SvCUR (sv) + 1);
93#endif
94 }
95}
96
97// decode an utf-8 character and return it, or (UV)-1 in
98// case of an error.
99// we special-case "safe" characters from U+80 .. U+7FF,
100// but use the very good perl function to parse anything else.
101// note that we never call this function for a ascii codepoints
102inline UV
103decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
104{
105 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
106 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
107 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
108 {
109 *clen = 2;
110 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
111 }
112 else
113 {
114 *clen = (STRLEN)-1;
115 return (UV)-1;
116 }
117}
118
119/////////////////////////////////////////////////////////////////////////////
120// encoder
28 121
29// structure used for encoding JSON 122// structure used for encoding JSON
30typedef struct 123typedef struct
31{ 124{
32 char *cur; 125 char *cur; // SvPVX (sv) + current output position
33 STRLEN len; // SvLEN (sv)
34 char *end; // SvEND (sv) 126 char *end; // SvEND (sv)
35 SV *sv; 127 SV *sv; // result scalar
36 UV flags; 128 JSON json;
37 int max_recurse; 129 U32 indent; // indentation level
38 int indent; 130 U32 maxdepth; // max. indentation/recursion level
39} enc_t; 131} enc_t;
40 132
41// structure used for decoding JSON 133inline void
42typedef struct
43{
44 char *cur;
45 char *end;
46 const char *err;
47 UV flags;
48} dec_t;
49
50static UV *
51SvJSON (SV *sv)
52{
53 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
54 croak ("object is not of type JSON::XS");
55
56 return &SvUVX (SvRV (sv));
57}
58
59/////////////////////////////////////////////////////////////////////////////
60
61static void
62need (enc_t *enc, STRLEN len) 134need (enc_t *enc, STRLEN len)
63{ 135{
64 if (enc->cur + len >= enc->end) 136 if (expect_false (enc->cur + len >= enc->end))
65 { 137 {
66 STRLEN cur = enc->cur - SvPVX (enc->sv); 138 STRLEN cur = enc->cur - SvPVX (enc->sv);
67 SvGROW (enc->sv, cur + len + 1); 139 SvGROW (enc->sv, cur + len + 1);
68 enc->cur = SvPVX (enc->sv) + cur; 140 enc->cur = SvPVX (enc->sv) + cur;
69 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 141 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
70 } 142 }
71} 143}
72 144
73static void 145inline void
74encode_ch (enc_t *enc, char ch) 146encode_ch (enc_t *enc, char ch)
75{ 147{
76 need (enc, 1); 148 need (enc, 1);
77 *enc->cur++ = ch; 149 *enc->cur++ = ch;
78} 150}
86 158
87 while (str < end) 159 while (str < end)
88 { 160 {
89 unsigned char ch = *(unsigned char *)str; 161 unsigned char ch = *(unsigned char *)str;
90 162
91 if (ch >= 0x20 && ch < 0x80) // most common case 163 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
92 { 164 {
93 if (ch == '"') // but with slow exceptions 165 if (expect_false (ch == '"')) // but with slow exceptions
94 { 166 {
95 need (enc, len += 1); 167 need (enc, len += 1);
96 *enc->cur++ = '\\'; 168 *enc->cur++ = '\\';
97 *enc->cur++ = '"'; 169 *enc->cur++ = '"';
98 } 170 }
99 else if (ch == '\\') 171 else if (expect_false (ch == '\\'))
100 { 172 {
101 need (enc, len += 1); 173 need (enc, len += 1);
102 *enc->cur++ = '\\'; 174 *enc->cur++ = '\\';
103 *enc->cur++ = '\\'; 175 *enc->cur++ = '\\';
104 } 176 }
122 STRLEN clen; 194 STRLEN clen;
123 UV uch; 195 UV uch;
124 196
125 if (is_utf8) 197 if (is_utf8)
126 { 198 {
127 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 199 uch = decode_utf8 (str, end - str, &clen);
128 if (clen == (STRLEN)-1) 200 if (clen == (STRLEN)-1)
129 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 201 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
130 } 202 }
131 else 203 else
132 { 204 {
133 uch = ch; 205 uch = ch;
134 clen = 1; 206 clen = 1;
135 } 207 }
136 208
137 if (uch < 0x80 || enc->flags & F_ASCII) 209 if (uch > 0x10FFFFUL)
210 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
211
212 if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
138 { 213 {
139 if (uch > 0xFFFFUL) 214 if (uch > 0xFFFFUL)
140 { 215 {
141 need (enc, len += 11); 216 need (enc, len += 11);
142 sprintf (enc->cur, "\\u%04x\\u%04x", 217 sprintf (enc->cur, "\\u%04x\\u%04x",
143 (uch - 0x10000) / 0x400 + 0xD800, 218 (int)((uch - 0x10000) / 0x400 + 0xD800),
144 (uch - 0x10000) % 0x400 + 0xDC00); 219 (int)((uch - 0x10000) % 0x400 + 0xDC00));
145 enc->cur += 12; 220 enc->cur += 12;
146 } 221 }
147 else 222 else
148 { 223 {
149 static char hexdigit [16] = "0123456789abcdef"; 224 static char hexdigit [16] = "0123456789abcdef";
156 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 231 *enc->cur++ = hexdigit [(uch >> 0) & 15];
157 } 232 }
158 233
159 str += clen; 234 str += clen;
160 } 235 }
236 else if (enc->json.flags & F_LATIN1)
237 {
238 *enc->cur++ = uch;
239 str += clen;
240 }
161 else if (is_utf8) 241 else if (is_utf8)
162 { 242 {
163 need (enc, len += clen); 243 need (enc, len += clen);
164 do 244 do
165 { 245 {
167 } 247 }
168 while (--clen); 248 while (--clen);
169 } 249 }
170 else 250 else
171 { 251 {
172 need (enc, 10); // never more than 11 bytes needed 252 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
173 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 253 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
174 ++str; 254 ++str;
175 } 255 }
176 } 256 }
177 } 257 }
179 259
180 --len; 260 --len;
181 } 261 }
182} 262}
183 263
184#define INDENT SB \ 264inline void
265encode_indent (enc_t *enc)
266{
185 if (enc->flags & F_INDENT) \ 267 if (enc->json.flags & F_INDENT)
186 { \ 268 {
187 int i_; \ 269 int spaces = enc->indent * INDENT_STEP;
188 need (enc, enc->indent); \ 270
189 for (i_ = enc->indent * 3; i_--; )\ 271 need (enc, spaces);
272 memset (enc->cur, ' ', spaces);
273 enc->cur += spaces;
274 }
275}
276
277inline void
278encode_space (enc_t *enc)
279{
280 need (enc, 1);
281 encode_ch (enc, ' ');
282}
283
284inline void
285encode_nl (enc_t *enc)
286{
287 if (enc->json.flags & F_INDENT)
288 {
289 need (enc, 1);
190 encode_ch (enc, ' '); \ 290 encode_ch (enc, '\n');
191 } \ 291 }
192 SE 292}
193 293
194#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 294inline void
195#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 295encode_comma (enc_t *enc)
196#define COMMA SB \ 296{
197 encode_ch (enc, ','); \ 297 encode_ch (enc, ',');
298
198 if (enc->flags & F_INDENT) \ 299 if (enc->json.flags & F_INDENT)
199 NL; \ 300 encode_nl (enc);
200 else if (enc->flags & F_SPACE_AFTER) \ 301 else if (enc->json.flags & F_SPACE_AFTER)
201 SPACE; \ 302 encode_space (enc);
202 SE 303}
203 304
204static void encode_sv (enc_t *enc, SV *sv); 305static void encode_sv (enc_t *enc, SV *sv);
205 306
206static void 307static void
207encode_av (enc_t *enc, AV *av) 308encode_av (enc_t *enc, AV *av)
208{ 309{
209 int i, len = av_len (av); 310 int i, len = av_len (av);
210 311
211 encode_ch (enc, '['); NL; 312 if (enc->indent >= enc->maxdepth)
313 croak ("data structure too deep (hit recursion limit)");
314
315 encode_ch (enc, '['); encode_nl (enc);
212 ++enc->indent; 316 ++enc->indent;
213 317
214 for (i = 0; i <= len; ++i) 318 for (i = 0; i <= len; ++i)
215 { 319 {
216 INDENT; 320 SV **svp = av_fetch (av, i, 0);
217 encode_sv (enc, *av_fetch (av, i, 0)); 321
322 encode_indent (enc);
323
324 if (svp)
325 encode_sv (enc, *svp);
326 else
327 encode_str (enc, "null", 4, 0);
218 328
219 if (i < len) 329 if (i < len)
220 COMMA; 330 encode_comma (enc);
221 } 331 }
222 332
223 NL; 333 encode_nl (enc);
224 334
225 --enc->indent; 335 --enc->indent;
226 INDENT; encode_ch (enc, ']'); 336 encode_indent (enc); encode_ch (enc, ']');
227} 337}
228 338
229static void 339static void
230encode_he (enc_t *enc, HE *he) 340encode_he (enc_t *enc, HE *he)
231{ 341{
245 else 355 else
246 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 356 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
247 357
248 encode_ch (enc, '"'); 358 encode_ch (enc, '"');
249 359
250 if (enc->flags & F_SPACE_BEFORE) SPACE; 360 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
251 encode_ch (enc, ':'); 361 encode_ch (enc, ':');
252 if (enc->flags & F_SPACE_AFTER ) SPACE; 362 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
253 encode_sv (enc, HeVAL (he)); 363 encode_sv (enc, HeVAL (he));
254} 364}
255 365
256// compare hash entries, used when all keys are bytestrings 366// compare hash entries, used when all keys are bytestrings
257static int 367static int
263 HE *b = *(HE **)b_; 373 HE *b = *(HE **)b_;
264 374
265 STRLEN la = HeKLEN (a); 375 STRLEN la = HeKLEN (a);
266 STRLEN lb = HeKLEN (b); 376 STRLEN lb = HeKLEN (b);
267 377
268 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 378 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
269 cmp = la < lb ? -1 : la == lb ? 0 : 1; 379 cmp = la - lb;
270 380
271 return cmp; 381 return cmp;
272} 382}
273 383
274// compare hash entries, used when some keys are sv's or utf-x 384// compare hash entries, used when some keys are sv's or utf-x
281static void 391static void
282encode_hv (enc_t *enc, HV *hv) 392encode_hv (enc_t *enc, HV *hv)
283{ 393{
284 int count, i; 394 int count, i;
285 395
396 if (enc->indent >= enc->maxdepth)
397 croak ("data structure too deep (hit recursion limit)");
398
286 encode_ch (enc, '{'); NL; ++enc->indent; 399 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
287 400
288 if ((count = hv_iterinit (hv))) 401 if ((count = hv_iterinit (hv)))
289 { 402 {
290 // for canonical output we have to sort by keys first 403 // for canonical output we have to sort by keys first
291 // actually, this is mostly due to the stupid so-called 404 // actually, this is mostly due to the stupid so-called
292 // security workaround added somewhere in 5.8.x. 405 // security workaround added somewhere in 5.8.x.
293 // that randomises hash orderings 406 // that randomises hash orderings
294 if (enc->flags & F_CANONICAL) 407 if (enc->json.flags & F_CANONICAL)
295 { 408 {
296 HE *he, *hes [count];
297 int fast = 1; 409 int fast = 1;
410 HE *he;
411#if defined(__BORLANDC__) || defined(_MSC_VER)
412 HE **hes = _alloca (count * sizeof (HE));
413#else
414 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
415#endif
298 416
299 i = 0; 417 i = 0;
300 while ((he = hv_iternext (hv))) 418 while ((he = hv_iternext (hv)))
301 { 419 {
302 hes [i++] = he; 420 hes [i++] = he;
308 426
309 if (fast) 427 if (fast)
310 qsort (hes, count, sizeof (HE *), he_cmp_fast); 428 qsort (hes, count, sizeof (HE *), he_cmp_fast);
311 else 429 else
312 { 430 {
313 // hack to disable "use bytes" 431 // hack to forcefully disable "use bytes"
314 COP *oldcop = PL_curcop, cop; 432 COP cop = *PL_curcop;
315 cop.op_private = 0; 433 cop.op_private = 0;
434
435 ENTER;
436 SAVETMPS;
437
438 SAVEVPTR (PL_curcop);
316 PL_curcop = &cop; 439 PL_curcop = &cop;
317 440
318 SAVETMPS;
319 qsort (hes, count, sizeof (HE *), he_cmp_slow); 441 qsort (hes, count, sizeof (HE *), he_cmp_slow);
442
320 FREETMPS; 443 FREETMPS;
321 444 LEAVE;
322 PL_curcop = oldcop;
323 } 445 }
324 446
325 for (i = 0; i < count; ++i) 447 for (i = 0; i < count; ++i)
326 { 448 {
327 INDENT; 449 encode_indent (enc);
328 encode_he (enc, hes [i]); 450 encode_he (enc, hes [i]);
329 451
330 if (i < count - 1) 452 if (i < count - 1)
331 COMMA; 453 encode_comma (enc);
332 }
333
334 NL; 454 }
455
456 encode_nl (enc);
335 } 457 }
336 else 458 else
337 { 459 {
338 SV *sv;
339 HE *he = hv_iternext (hv); 460 HE *he = hv_iternext (hv);
340 461
341 for (;;) 462 for (;;)
342 { 463 {
343 INDENT; 464 encode_indent (enc);
344 encode_he (enc, he); 465 encode_he (enc, he);
345 466
346 if (!(he = hv_iternext (hv))) 467 if (!(he = hv_iternext (hv)))
347 break; 468 break;
348 469
349 COMMA; 470 encode_comma (enc);
350 }
351
352 NL; 471 }
472
473 encode_nl (enc);
353 } 474 }
354 } 475 }
355 476
356 --enc->indent; INDENT; encode_ch (enc, '}'); 477 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
478}
479
480// encode objects, arrays and special \0=false and \1=true values.
481static void
482encode_rv (enc_t *enc, SV *sv)
483{
484 svtype svt;
485
486 SvGETMAGIC (sv);
487 svt = SvTYPE (sv);
488
489 if (expect_false (SvOBJECT (sv)))
490 {
491 HV *stash = !JSON_SLOW || json_boolean_stash
492 ? json_boolean_stash
493 : gv_stashpv ("JSON::XS::Boolean", 1);
494
495 if (SvSTASH (sv) == stash)
496 {
497 if (SvIV (sv))
498 encode_str (enc, "true", 4, 0);
499 else
500 encode_str (enc, "false", 5, 0);
501 }
502 else
503 {
504#if 0
505 if (0 && sv_derived_from (rv, "JSON::Literal"))
506 {
507 // not yet
508 }
509#endif
510 if (enc->json.flags & F_CONV_BLESSED)
511 {
512 // we re-bless the reference to get overload and other niceties right
513 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
514
515 if (to_json)
516 {
517 dSP;
518
519 ENTER; SAVETMPS; PUSHMARK (SP);
520 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
521
522 // calling with G_SCALAR ensures that we always get a 1 return value
523 PUTBACK;
524 call_sv ((SV *)GvCV (to_json), G_SCALAR);
525 SPAGAIN;
526
527 // catch this surprisingly common error
528 if (SvROK (TOPs) && SvRV (TOPs) == sv)
529 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
530
531 sv = POPs;
532 PUTBACK;
533
534 encode_sv (enc, sv);
535
536 FREETMPS; LEAVE;
537 }
538 else if (enc->json.flags & F_ALLOW_BLESSED)
539 encode_str (enc, "null", 4, 0);
540 else
541 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
542 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
543 }
544 else if (enc->json.flags & F_ALLOW_BLESSED)
545 encode_str (enc, "null", 4, 0);
546 else
547 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
548 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
549 }
550 }
551 else if (svt == SVt_PVHV)
552 encode_hv (enc, (HV *)sv);
553 else if (svt == SVt_PVAV)
554 encode_av (enc, (AV *)sv);
555 else if (svt < SVt_PVAV)
556 {
557 STRLEN len = 0;
558 char *pv = svt ? SvPV (sv, len) : 0;
559
560 if (len == 1 && *pv == '1')
561 encode_str (enc, "true", 4, 0);
562 else if (len == 1 && *pv == '0')
563 encode_str (enc, "false", 5, 0);
564 else
565 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
566 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
567 }
568 else
569 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
570 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
357} 571}
358 572
359static void 573static void
360encode_sv (enc_t *enc, SV *sv) 574encode_sv (enc_t *enc, SV *sv)
361{ 575{
369 encode_str (enc, str, len, SvUTF8 (sv)); 583 encode_str (enc, str, len, SvUTF8 (sv));
370 encode_ch (enc, '"'); 584 encode_ch (enc, '"');
371 } 585 }
372 else if (SvNOKp (sv)) 586 else if (SvNOKp (sv))
373 { 587 {
588 // trust that perl will do the right thing w.r.t. JSON syntax.
374 need (enc, NV_DIG + 32); 589 need (enc, NV_DIG + 32);
375 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 590 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
376 enc->cur += strlen (enc->cur); 591 enc->cur += strlen (enc->cur);
377 } 592 }
378 else if (SvIOKp (sv)) 593 else if (SvIOKp (sv))
379 { 594 {
380 need (enc, 64); 595 // we assume we can always read an IV as a UV
596 if (SvUV (sv) & ~(UV)0x7fff)
597 {
598 // large integer, use the (rather slow) snprintf way.
599 need (enc, sizeof (UV) * 3);
381 enc->cur += 600 enc->cur +=
382 SvIsUV(sv) 601 SvIsUV(sv)
383 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 602 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
384 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 603 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
604 }
605 else
606 {
607 // optimise the "small number case"
608 // code will likely be branchless and use only a single multiplication
609 I32 i = SvIV (sv);
610 U32 u;
611 char digit, nz = 0;
612
613 need (enc, 6);
614
615 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
616 u = i < 0 ? -i : i;
617
618 // convert to 4.28 fixed-point representation
619 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
620
621 // now output digit by digit, each time masking out the integer part
622 // and multiplying by 5 while moving the decimal point one to the right,
623 // resulting in a net multiplication by 10.
624 // we always write the digit to memory but conditionally increment
625 // the pointer, to ease the usage of conditional move instructions.
626 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
627 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
628 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
629 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
630 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
631 }
385 } 632 }
386 else if (SvROK (sv)) 633 else if (SvROK (sv))
387 { 634 encode_rv (enc, SvRV (sv));
388 if (!--enc->max_recurse)
389 croak ("data structure too deep (hit recursion limit)");
390
391 sv = SvRV (sv);
392
393 switch (SvTYPE (sv))
394 {
395 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
396 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
397
398 default:
399 croak ("JSON can only represent references to arrays or hashes");
400 }
401 }
402 else if (!SvOK (sv)) 635 else if (!SvOK (sv))
403 encode_str (enc, "null", 4, 0); 636 encode_str (enc, "null", 4, 0);
404 else 637 else
405 croak ("encountered perl type that JSON cannot handle"); 638 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
639 SvPV_nolen (sv), SvFLAGS (sv));
406} 640}
407 641
408static SV * 642static SV *
409encode_json (SV *scalar, UV flags) 643encode_json (SV *scalar, JSON *json)
410{ 644{
411 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
412 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
413
414 enc_t enc; 645 enc_t enc;
415 enc.flags = flags; 646
647 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
648 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
649
650 enc.json = *json;
416 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 651 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
417 enc.cur = SvPVX (enc.sv); 652 enc.cur = SvPVX (enc.sv);
418 enc.end = SvEND (enc.sv); 653 enc.end = SvEND (enc.sv);
419 enc.max_recurse = 0;
420 enc.indent = 0; 654 enc.indent = 0;
655 enc.maxdepth = DEC_DEPTH (enc.json.flags);
421 656
422 SvPOK_only (enc.sv); 657 SvPOK_only (enc.sv);
423 encode_sv (&enc, scalar); 658 encode_sv (&enc, scalar);
424 659
660 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
661 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
662
425 if (!(flags & (F_ASCII | F_UTF8))) 663 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
426 SvUTF8_on (enc.sv); 664 SvUTF8_on (enc.sv);
427 665
428 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
429
430#ifdef SvPV_shrink_to_cur
431 if (enc.flags & F_SHRINK) 666 if (enc.json.flags & F_SHRINK)
432 SvPV_shrink_to_cur (enc.sv); 667 shrink (enc.sv);
433#endif 668
434 return enc.sv; 669 return enc.sv;
435} 670}
436 671
437///////////////////////////////////////////////////////////////////////////// 672/////////////////////////////////////////////////////////////////////////////
673// decoder
438 674
439#define WS \ 675// structure used for decoding JSON
676typedef struct
677{
678 char *cur; // current parser pointer
679 char *end; // end of input string
680 const char *err; // parse error, if != 0
681 JSON json;
682 U32 depth; // recursion depth
683 U32 maxdepth; // recursion depth limit
684} dec_t;
685
686inline void
687decode_ws (dec_t *dec)
688{
440 for (;;) \ 689 for (;;)
441 { \ 690 {
442 char ch = *dec->cur; \ 691 char ch = *dec->cur;
692
443 if (ch > 0x20 \ 693 if (ch > 0x20
444 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 694 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
445 break; \ 695 break;
696
446 ++dec->cur; \ 697 ++dec->cur;
447 } 698 }
699}
448 700
449#define ERR(reason) SB dec->err = reason; goto fail; SE 701#define ERR(reason) SB dec->err = reason; goto fail; SE
702
450#define EXPECT_CH(ch) SB \ 703#define EXPECT_CH(ch) SB \
451 if (*dec->cur != ch) \ 704 if (*dec->cur != ch) \
452 ERR (# ch " expected"); \ 705 ERR (# ch " expected"); \
453 ++dec->cur; \ 706 ++dec->cur; \
454 SE 707 SE
455 708
709#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
710#define DEC_DEC_DEPTH --dec->depth
711
456static SV *decode_sv (dec_t *dec); 712static SV *decode_sv (dec_t *dec);
457 713
458static signed char decode_hexdigit[256]; 714static signed char decode_hexdigit[256];
459 715
460static UV 716static UV
461decode_4hex (dec_t *dec) 717decode_4hex (dec_t *dec)
462{ 718{
463 signed char d1, d2, d3, d4; 719 signed char d1, d2, d3, d4;
720 unsigned char *cur = (unsigned char *)dec->cur;
464 721
465 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 722 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
466 if (d1 < 0) ERR ("four hexadecimal digits expected"); 723 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
467 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 724 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
468 if (d2 < 0) ERR ("four hexadecimal digits expected"); 725 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
469 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
470 if (d3 < 0) ERR ("four hexadecimal digits expected");
471 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
472 if (d4 < 0) ERR ("four hexadecimal digits expected");
473 726
474 dec->cur += 4; 727 dec->cur += 4;
475 728
476 return ((UV)d1) << 12 729 return ((UV)d1) << 12
477 | ((UV)d2) << 8 730 | ((UV)d2) << 8
480 733
481fail: 734fail:
482 return (UV)-1; 735 return (UV)-1;
483} 736}
484 737
485#define APPEND_GROW(n) SB \
486 if (cur + (n) >= end) \
487 { \
488 STRLEN ofs = cur - SvPVX (sv); \
489 SvGROW (sv, ofs + (n) + 1); \
490 cur = SvPVX (sv) + ofs; \
491 end = SvEND (sv); \
492 } \
493 SE
494
495#define APPEND_CH(ch) SB \
496 APPEND_GROW (1); \
497 *cur++ = (ch); \
498 SE
499
500static SV * 738static SV *
501decode_str (dec_t *dec) 739decode_str (dec_t *dec)
502{ 740{
503 SV *sv = NEWSV (0,2); 741 SV *sv = 0;
504 int utf8 = 0; 742 int utf8 = 0;
505 char *cur = SvPVX (sv); 743 char *dec_cur = dec->cur;
506 char *end = SvEND (sv);
507 744
508 for (;;) 745 do
509 { 746 {
510 unsigned char ch = *(unsigned char *)dec->cur; 747 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
748 char *cur = buf;
511 749
512 if (ch == '"') 750 do
513 break;
514 else if (ch == '\\')
515 { 751 {
516 switch (*++dec->cur) 752 unsigned char ch = *(unsigned char *)dec_cur++;
753
754 if (expect_false (ch == '"'))
755 {
756 --dec_cur;
757 break;
517 { 758 }
518 case '\\': 759 else if (expect_false (ch == '\\'))
519 case '/': 760 {
520 case '"': APPEND_CH (*dec->cur++); break; 761 switch (*dec_cur)
521
522 case 'b': APPEND_CH ('\010'); ++dec->cur; break;
523 case 't': APPEND_CH ('\011'); ++dec->cur; break;
524 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
525 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
526 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
527
528 case 'u':
529 { 762 {
530 UV lo, hi; 763 case '\\':
531 ++dec->cur; 764 case '/':
765 case '"': *cur++ = *dec_cur++; break;
532 766
533 hi = decode_4hex (dec); 767 case 'b': ++dec_cur; *cur++ = '\010'; break;
534 if (hi == (UV)-1) 768 case 't': ++dec_cur; *cur++ = '\011'; break;
535 goto fail; 769 case 'n': ++dec_cur; *cur++ = '\012'; break;
770 case 'f': ++dec_cur; *cur++ = '\014'; break;
771 case 'r': ++dec_cur; *cur++ = '\015'; break;
536 772
537 // possibly a surrogate pair 773 case 'u':
538 if (hi >= 0xd800 && hi < 0xdc00)
539 { 774 {
540 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 775 UV lo, hi;
541 ERR ("missing low surrogate character in surrogate pair"); 776 ++dec_cur;
542 777
543 dec->cur += 2; 778 dec->cur = dec_cur;
544
545 lo = decode_4hex (dec); 779 hi = decode_4hex (dec);
780 dec_cur = dec->cur;
546 if (lo == (UV)-1) 781 if (hi == (UV)-1)
547 goto fail; 782 goto fail;
548 783
784 // possibly a surrogate pair
785 if (hi >= 0xd800)
786 if (hi < 0xdc00)
787 {
788 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
789 ERR ("missing low surrogate character in surrogate pair");
790
791 dec_cur += 2;
792
793 dec->cur = dec_cur;
794 lo = decode_4hex (dec);
795 dec_cur = dec->cur;
796 if (lo == (UV)-1)
797 goto fail;
798
549 if (lo < 0xdc00 || lo >= 0xe000) 799 if (lo < 0xdc00 || lo >= 0xe000)
550 ERR ("surrogate pair expected"); 800 ERR ("surrogate pair expected");
551 801
552 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 802 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
803 }
804 else if (hi < 0xe000)
805 ERR ("missing high surrogate character in surrogate pair");
806
807 if (hi >= 0x80)
808 {
809 utf8 = 1;
810
811 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
812 }
813 else
814 *cur++ = hi;
553 } 815 }
554 else if (hi >= 0xdc00 && hi < 0xe000)
555 ERR ("missing high surrogate character in surrogate pair");
556
557 if (hi >= 0x80)
558 { 816 break;
559 utf8 = 1;
560 817
561 APPEND_GROW (4); // at most 4 bytes for 21 bits
562 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
563 }
564 else 818 default:
565 APPEND_CH (hi); 819 --dec_cur;
820 ERR ("illegal backslash escape sequence in string");
566 } 821 }
567 break; 822 }
823 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
824 *cur++ = ch;
825 else if (ch >= 0x80)
826 {
827 STRLEN clen;
828 UV uch;
568 829
569 default:
570 --dec->cur; 830 --dec_cur;
571 ERR ("illegal backslash escape sequence in string"); 831
832 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
833 if (clen == (STRLEN)-1)
834 ERR ("malformed UTF-8 character in JSON string");
835
836 do
837 *cur++ = *dec_cur++;
838 while (--clen);
839
840 utf8 = 1;
841 }
842 else
843 {
844 --dec_cur;
845
846 if (!ch)
847 ERR ("unexpected end of string while parsing JSON string");
848 else
849 ERR ("invalid character encountered while parsing JSON string");
572 } 850 }
573 } 851 }
574 else if (ch >= 0x20 && ch <= 0x7f) 852 while (cur < buf + SHORT_STRING_LEN);
575 APPEND_CH (*dec->cur++); 853
576 else if (ch >= 0x80)
577 { 854 {
578 STRLEN clen; 855 STRLEN len = cur - buf;
579 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
580 if (clen == (STRLEN)-1)
581 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
582 856
583 APPEND_GROW (clen); 857 if (sv)
584 do
585 { 858 {
586 *cur++ = *dec->cur++; 859 SvGROW (sv, SvCUR (sv) + len + 1);
860 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
861 SvCUR_set (sv, SvCUR (sv) + len);
587 } 862 }
588 while (--clen);
589
590 utf8 = 1;
591 }
592 else if (dec->cur == dec->end)
593 ERR ("unexpected end of string while parsing json string");
594 else 863 else
595 ERR ("invalid character encountered"); 864 sv = newSVpvn (buf, len);
596 } 865 }
866 }
867 while (*dec_cur != '"');
597 868
598 ++dec->cur; 869 ++dec_cur;
599 870
600 SvCUR_set (sv, cur - SvPVX (sv)); 871 if (sv)
601 872 {
602 SvPOK_only (sv); 873 SvPOK_only (sv);
603 *SvEND (sv) = 0; 874 *SvEND (sv) = 0;
604 875
605 if (utf8) 876 if (utf8)
606 SvUTF8_on (sv); 877 SvUTF8_on (sv);
878 }
879 else
880 sv = newSVpvn ("", 0);
607 881
608#ifdef SvPV_shrink_to_cur 882 dec->cur = dec_cur;
609 if (dec->flags & F_SHRINK)
610 SvPV_shrink_to_cur (sv);
611#endif
612
613 return sv; 883 return sv;
614 884
615fail: 885fail:
616 SvREFCNT_dec (sv); 886 dec->cur = dec_cur;
617 return 0; 887 return 0;
618} 888}
619 889
620static SV * 890static SV *
621decode_num (dec_t *dec) 891decode_num (dec_t *dec)
679 is_nv = 1; 949 is_nv = 1;
680 } 950 }
681 951
682 if (!is_nv) 952 if (!is_nv)
683 { 953 {
684 UV uv; 954 int len = dec->cur - start;
685 int numtype = grok_number (start, dec->cur - start, &uv); 955
686 if (numtype & IS_NUMBER_IN_UV) 956 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
687 if (numtype & IS_NUMBER_NEG) 957 if (*start == '-')
958 switch (len)
688 { 959 {
689 if (uv < (UV)IV_MIN) 960 case 2: return newSViv (-( start [1] - '0' * 1));
690 return newSViv (-(IV)uv); 961 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
962 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
963 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
691 } 964 }
965 else
966 switch (len)
967 {
968 case 1: return newSViv ( start [0] - '0' * 1);
969 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
970 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
971 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
972 }
973
974 {
975 UV uv;
976 int numtype = grok_number (start, len, &uv);
977 if (numtype & IS_NUMBER_IN_UV)
978 if (numtype & IS_NUMBER_NEG)
979 {
980 if (uv < (UV)IV_MIN)
981 return newSViv (-(IV)uv);
982 }
692 else 983 else
693 return newSVuv (uv); 984 return newSVuv (uv);
694 } 985 }
695 986
987 len -= *start == '-' ? 1 : 0;
988
989 // does not fit into IV or UV, try NV
990 if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
991 #if defined (LDBL_DIG)
992 || (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
993 #endif
994 )
995 // fits into NV without loss of precision
996 return newSVnv (Atof (start));
997
998 // everything else fails, convert it to a string
999 return newSVpvn (start, dec->cur - start);
1000 }
1001
1002 // loss of precision here
696 return newSVnv (Atof (start)); 1003 return newSVnv (Atof (start));
697 1004
698fail: 1005fail:
699 return 0; 1006 return 0;
700} 1007}
702static SV * 1009static SV *
703decode_av (dec_t *dec) 1010decode_av (dec_t *dec)
704{ 1011{
705 AV *av = newAV (); 1012 AV *av = newAV ();
706 1013
707 WS; 1014 DEC_INC_DEPTH;
1015 decode_ws (dec);
1016
708 if (*dec->cur == ']') 1017 if (*dec->cur == ']')
709 ++dec->cur; 1018 ++dec->cur;
710 else 1019 else
711 for (;;) 1020 for (;;)
712 { 1021 {
716 if (!value) 1025 if (!value)
717 goto fail; 1026 goto fail;
718 1027
719 av_push (av, value); 1028 av_push (av, value);
720 1029
721 WS; 1030 decode_ws (dec);
722 1031
723 if (*dec->cur == ']') 1032 if (*dec->cur == ']')
724 { 1033 {
725 ++dec->cur; 1034 ++dec->cur;
726 break; 1035 break;
730 ERR (", or ] expected while parsing array"); 1039 ERR (", or ] expected while parsing array");
731 1040
732 ++dec->cur; 1041 ++dec->cur;
733 } 1042 }
734 1043
1044 DEC_DEC_DEPTH;
735 return newRV_noinc ((SV *)av); 1045 return newRV_noinc ((SV *)av);
736 1046
737fail: 1047fail:
738 SvREFCNT_dec (av); 1048 SvREFCNT_dec (av);
1049 DEC_DEC_DEPTH;
739 return 0; 1050 return 0;
740} 1051}
741 1052
742static SV * 1053static SV *
743decode_hv (dec_t *dec) 1054decode_hv (dec_t *dec)
744{ 1055{
1056 SV *sv;
745 HV *hv = newHV (); 1057 HV *hv = newHV ();
746 1058
747 WS; 1059 DEC_INC_DEPTH;
1060 decode_ws (dec);
1061
748 if (*dec->cur == '}') 1062 if (*dec->cur == '}')
749 ++dec->cur; 1063 ++dec->cur;
750 else 1064 else
751 for (;;) 1065 for (;;)
752 { 1066 {
1067 decode_ws (dec); EXPECT_CH ('"');
1068
1069 // heuristic: assume that
1070 // a) decode_str + hv_store_ent are abysmally slow.
1071 // b) most hash keys are short, simple ascii text.
1072 // => try to "fast-match" such strings to avoid
1073 // the overhead of decode_str + hv_store_ent.
1074 {
753 SV *key, *value; 1075 SV *value;
1076 char *p = dec->cur;
1077 char *e = p + 24; // only try up to 24 bytes
754 1078
755 WS; EXPECT_CH ('"'); 1079 for (;;)
756
757 key = decode_str (dec);
758 if (!key)
759 goto fail;
760
761 WS; EXPECT_CH (':');
762
763 value = decode_sv (dec);
764 if (!value)
765 { 1080 {
1081 // the >= 0x80 is true on most architectures
1082 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1083 {
1084 // slow path, back up and use decode_str
1085 SV *key = decode_str (dec);
1086 if (!key)
1087 goto fail;
1088
1089 decode_ws (dec); EXPECT_CH (':');
1090
1091 value = decode_sv (dec);
1092 if (!value)
1093 {
1094 SvREFCNT_dec (key);
1095 goto fail;
1096 }
1097
1098 hv_store_ent (hv, key, value, 0);
766 SvREFCNT_dec (key); 1099 SvREFCNT_dec (key);
1100
1101 break;
1102 }
1103 else if (*p == '"')
1104 {
1105 // fast path, got a simple key
1106 char *key = dec->cur;
1107 int len = p - key;
1108 dec->cur = p + 1;
1109
1110 decode_ws (dec); EXPECT_CH (':');
1111
1112 value = decode_sv (dec);
1113 if (!value)
767 goto fail; 1114 goto fail;
1115
1116 hv_store (hv, key, len, value, 0);
1117
1118 break;
1119 }
1120
1121 ++p;
768 } 1122 }
769
770 //TODO: optimise
771 hv_store_ent (hv, key, value, 0);
772
773 WS; 1123 }
1124
1125 decode_ws (dec);
774 1126
775 if (*dec->cur == '}') 1127 if (*dec->cur == '}')
776 { 1128 {
777 ++dec->cur; 1129 ++dec->cur;
778 break; 1130 break;
782 ERR (", or } expected while parsing object/hash"); 1134 ERR (", or } expected while parsing object/hash");
783 1135
784 ++dec->cur; 1136 ++dec->cur;
785 } 1137 }
786 1138
1139 DEC_DEC_DEPTH;
787 return newRV_noinc ((SV *)hv); 1140 sv = newRV_noinc ((SV *)hv);
1141
1142 // check filter callbacks
1143 if (dec->json.flags & F_HOOK)
1144 {
1145 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
1146 {
1147 HE *cb, *he;
1148
1149 hv_iterinit (hv);
1150 he = hv_iternext (hv);
1151 hv_iterinit (hv);
1152
1153 // the next line creates a mortal sv each time its called.
1154 // might want to optimise this for common cases.
1155 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1156
1157 if (cb)
1158 {
1159 dSP;
1160 int count;
1161
1162 ENTER; SAVETMPS; PUSHMARK (SP);
1163 XPUSHs (HeVAL (he));
1164
1165 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1166
1167 if (count == 1)
1168 {
1169 sv = newSVsv (POPs);
1170 FREETMPS; LEAVE;
1171 return sv;
1172 }
1173
1174 FREETMPS; LEAVE;
1175 }
1176 }
1177
1178 if (dec->json.cb_object)
1179 {
1180 dSP;
1181 int count;
1182
1183 ENTER; SAVETMPS; PUSHMARK (SP);
1184 XPUSHs (sv_2mortal (sv));
1185
1186 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1187
1188 if (count == 1)
1189 {
1190 sv = newSVsv (POPs);
1191 FREETMPS; LEAVE;
1192 return sv;
1193 }
1194
1195 SvREFCNT_inc (sv);
1196 FREETMPS; LEAVE;
1197 }
1198 }
1199
1200 return sv;
788 1201
789fail: 1202fail:
790 SvREFCNT_dec (hv); 1203 SvREFCNT_dec (hv);
1204 DEC_DEC_DEPTH;
791 return 0; 1205 return 0;
792} 1206}
793 1207
794static SV * 1208static SV *
795decode_sv (dec_t *dec) 1209decode_sv (dec_t *dec)
796{ 1210{
797 WS; 1211 decode_ws (dec);
1212
1213 // the beauty of JSON: you need exactly one character lookahead
1214 // to parse anything.
798 switch (*dec->cur) 1215 switch (*dec->cur)
799 { 1216 {
800 case '"': ++dec->cur; return decode_str (dec); 1217 case '"': ++dec->cur; return decode_str (dec);
801 case '[': ++dec->cur; return decode_av (dec); 1218 case '[': ++dec->cur; return decode_av (dec);
802 case '{': ++dec->cur; return decode_hv (dec); 1219 case '{': ++dec->cur; return decode_hv (dec);
808 1225
809 case 't': 1226 case 't':
810 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1227 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
811 { 1228 {
812 dec->cur += 4; 1229 dec->cur += 4;
813 return newSViv (1); 1230 return SvREFCNT_inc (json_true);
814 } 1231 }
815 else 1232 else
816 ERR ("'true' expected"); 1233 ERR ("'true' expected");
817 1234
818 break; 1235 break;
819 1236
820 case 'f': 1237 case 'f':
821 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1238 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
822 { 1239 {
823 dec->cur += 5; 1240 dec->cur += 5;
824 return newSViv (0); 1241 return SvREFCNT_inc (json_false);
825 } 1242 }
826 else 1243 else
827 ERR ("'false' expected"); 1244 ERR ("'false' expected");
828 1245
829 break; 1246 break;
838 ERR ("'null' expected"); 1255 ERR ("'null' expected");
839 1256
840 break; 1257 break;
841 1258
842 default: 1259 default:
843 ERR ("malformed json string"); 1260 ERR ("malformed JSON string, neither array, object, number, string or atom");
844 break; 1261 break;
845 } 1262 }
846 1263
847fail: 1264fail:
848 return 0; 1265 return 0;
849} 1266}
850 1267
851static SV * 1268static SV *
852decode_json (SV *string, UV flags) 1269decode_json (SV *string, JSON *json, UV *offset_return)
853{ 1270{
1271 dec_t dec;
1272 UV offset;
854 SV *sv; 1273 SV *sv;
855 1274
1275 SvGETMAGIC (string);
1276 SvUPGRADE (string, SVt_PV);
1277
1278 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1279 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1280 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1281
856 if (flags & F_UTF8) 1282 if (json->flags & F_UTF8)
857 sv_utf8_downgrade (string, 0); 1283 sv_utf8_downgrade (string, 0);
858 else 1284 else
859 sv_utf8_upgrade (string); 1285 sv_utf8_upgrade (string);
860 1286
861 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1287 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
862 1288
863 dec_t dec; 1289 dec.json = *json;
864 dec.flags = flags;
865 dec.cur = SvPVX (string); 1290 dec.cur = SvPVX (string);
866 dec.end = SvEND (string); 1291 dec.end = SvEND (string);
867 dec.err = 0; 1292 dec.err = 0;
1293 dec.depth = 0;
1294 dec.maxdepth = DEC_DEPTH (dec.json.flags);
868 1295
1296 if (dec.json.cb_object || dec.json.cb_sk_object)
1297 dec.json.flags |= F_HOOK;
1298
1299 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
869 sv = decode_sv (&dec); 1300 sv = decode_sv (&dec);
870 1301
1302 if (!(offset_return || !sv))
1303 {
1304 // check for trailing garbage
1305 decode_ws (&dec);
1306
1307 if (*dec.cur)
1308 {
1309 dec.err = "garbage after JSON object";
1310 SvREFCNT_dec (sv);
1311 sv = 0;
1312 }
1313 }
1314
1315 if (offset_return || !sv)
1316 {
1317 offset = dec.json.flags & F_UTF8
1318 ? dec.cur - SvPVX (string)
1319 : utf8_distance (dec.cur, SvPVX (string));
1320
1321 if (offset_return)
1322 *offset_return = offset;
1323 }
1324
871 if (!sv) 1325 if (!sv)
872 { 1326 {
873 IV offset = utf8_distance (dec.cur, SvPVX (string));
874 SV *uni = sv_newmortal (); 1327 SV *uni = sv_newmortal ();
1328
875 // horrible hack to silence warning inside pv_uni_display 1329 // horrible hack to silence warning inside pv_uni_display
876 COP cop; 1330 COP cop = *PL_curcop;
877 memset (&cop, 0, sizeof (cop));
878 cop.cop_warnings = pWARN_NONE; 1331 cop.cop_warnings = pWARN_NONE;
1332 ENTER;
879 SAVEVPTR (PL_curcop); 1333 SAVEVPTR (PL_curcop);
880 PL_curcop = &cop; 1334 PL_curcop = &cop;
881
882 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1335 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1336 LEAVE;
1337
883 croak ("%s, at character offset %d (%s)", 1338 croak ("%s, at character offset %d [\"%s\"]",
884 dec.err, 1339 dec.err,
885 (int)offset, 1340 (int)offset,
886 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1341 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
887 } 1342 }
888 1343
889 sv = sv_2mortal (sv); 1344 sv = sv_2mortal (sv);
890 1345
891 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1346 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
892 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1347 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
893 1348
894 return sv; 1349 return sv;
895} 1350}
896 1351
1352/////////////////////////////////////////////////////////////////////////////
1353// XS interface functions
1354
897MODULE = JSON::XS PACKAGE = JSON::XS 1355MODULE = JSON::XS PACKAGE = JSON::XS
898 1356
899BOOT: 1357BOOT:
900{ 1358{
901 int i; 1359 int i;
902 1360
903 memset (decode_hexdigit, 0xff, 256);
904 for (i = 10; i--; ) 1361 for (i = 0; i < 256; ++i)
905 decode_hexdigit ['0' + i] = i; 1362 decode_hexdigit [i] =
1363 i >= '0' && i <= '9' ? i - '0'
1364 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1365 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1366 : -1;
906 1367
907 for (i = 7; i--; ) 1368 json_stash = gv_stashpv ("JSON::XS" , 1);
1369 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1370
1371 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1372 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1373}
1374
1375PROTOTYPES: DISABLE
1376
1377void CLONE (...)
1378 CODE:
1379 json_stash = 0;
1380 json_boolean_stash = 0;
1381
1382void new (char *klass)
1383 PPCODE:
1384{
1385 SV *pv = NEWSV (0, sizeof (JSON));
1386 SvPOK_only (pv);
1387 Zero (SvPVX (pv), 1, JSON);
1388 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1389 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
1390}
1391
1392void ascii (JSON *self, int enable = 1)
1393 ALIAS:
1394 ascii = F_ASCII
1395 latin1 = F_LATIN1
1396 utf8 = F_UTF8
1397 indent = F_INDENT
1398 canonical = F_CANONICAL
1399 space_before = F_SPACE_BEFORE
1400 space_after = F_SPACE_AFTER
1401 pretty = F_PRETTY
1402 allow_nonref = F_ALLOW_NONREF
1403 shrink = F_SHRINK
1404 allow_blessed = F_ALLOW_BLESSED
1405 convert_blessed = F_CONV_BLESSED
1406 PPCODE:
1407{
1408 if (enable)
1409 self->flags |= ix;
1410 else
1411 self->flags &= ~ix;
1412
1413 XPUSHs (ST (0));
1414}
1415
1416void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1417 PPCODE:
1418{
1419 UV log2 = 0;
1420
1421 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1422
1423 while ((1UL << log2) < max_depth)
1424 ++log2;
1425
1426 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1427
1428 XPUSHs (ST (0));
1429}
1430
1431void max_size (JSON *self, UV max_size = 0)
1432 PPCODE:
1433{
1434 UV log2 = 0;
1435
1436 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1437 if (max_size == 1) max_size = 2;
1438
1439 while ((1UL << log2) < max_size)
1440 ++log2;
1441
1442 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1443
1444 XPUSHs (ST (0));
1445}
1446
1447void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1448 PPCODE:
1449{
1450 SvREFCNT_dec (self->cb_object);
1451 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1452
1453 XPUSHs (ST (0));
1454}
1455
1456void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1457 PPCODE:
1458{
1459 if (!self->cb_sk_object)
1460 self->cb_sk_object = newHV ();
1461
1462 if (SvOK (cb))
1463 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1464 else
908 { 1465 {
909 decode_hexdigit ['a' + i] = 10 + i; 1466 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
910 decode_hexdigit ['A' + i] = 10 + i; 1467
1468 if (!HvKEYS (self->cb_sk_object))
1469 {
1470 SvREFCNT_dec (self->cb_sk_object);
1471 self->cb_sk_object = 0;
1472 }
911 } 1473 }
912 1474
913 json_stash = gv_stashpv ("JSON::XS", 1); 1475 XPUSHs (ST (0));
914} 1476}
915 1477
916PROTOTYPES: DISABLE 1478void encode (JSON *self, SV *scalar)
1479 PPCODE:
1480 XPUSHs (encode_json (scalar, self));
917 1481
918SV *new (char *dummy) 1482void decode (JSON *self, SV *jsonstr)
1483 PPCODE:
1484 XPUSHs (decode_json (jsonstr, self, 0));
1485
1486void decode_prefix (JSON *self, SV *jsonstr)
1487 PPCODE:
1488{
1489 UV offset;
1490 EXTEND (SP, 2);
1491 PUSHs (decode_json (jsonstr, self, &offset));
1492 PUSHs (sv_2mortal (newSVuv (offset)));
1493}
1494
1495void DESTROY (JSON *self)
919 CODE: 1496 CODE:
920 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1497 SvREFCNT_dec (self->cb_sk_object);
921 OUTPUT: 1498 SvREFCNT_dec (self->cb_object);
922 RETVAL
923
924SV *ascii (SV *self, int enable = 1)
925 ALIAS:
926 ascii = F_ASCII
927 utf8 = F_UTF8
928 indent = F_INDENT
929 canonical = F_CANONICAL
930 space_before = F_SPACE_BEFORE
931 space_after = F_SPACE_AFTER
932 json_rpc = F_JSON_RPC
933 pretty = F_PRETTY
934 allow_nonref = F_ALLOW_NONREF
935 shrink = F_SHRINK
936 CODE:
937{
938 UV *uv = SvJSON (self);
939 if (enable)
940 *uv |= ix;
941 else
942 *uv &= ~ix;
943
944 RETVAL = newSVsv (self);
945}
946 OUTPUT:
947 RETVAL
948
949void encode (SV *self, SV *scalar)
950 PPCODE:
951 XPUSHs (encode_json (scalar, *SvJSON (self)));
952
953void decode (SV *self, SV *jsonstr)
954 PPCODE:
955 XPUSHs (decode_json (jsonstr, *SvJSON (self)));
956 1499
957PROTOTYPES: ENABLE 1500PROTOTYPES: ENABLE
958 1501
959void to_json (SV *scalar) 1502void to_json (SV *scalar)
960 PPCODE: 1503 PPCODE:
1504{
1505 JSON json = { F_DEFAULT | F_UTF8 };
961 XPUSHs (encode_json (scalar, F_UTF8)); 1506 XPUSHs (encode_json (scalar, &json));
1507}
962 1508
963void from_json (SV *jsonstr) 1509void from_json (SV *jsonstr)
964 PPCODE: 1510 PPCODE:
1511{
1512 JSON json = { F_DEFAULT | F_UTF8 };
965 XPUSHs (decode_json (jsonstr, F_UTF8)); 1513 XPUSHs (decode_json (jsonstr, &json, 0));
1514}
966 1515

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