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Comparing JSON-XS/XS.xs (file contents):
Revision 1.9 by root, Fri Mar 23 17:40:29 2007 UTC vs.
Revision 1.35 by root, Wed Jun 6 14:52:49 2007 UTC

… …
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"
8 9
10#if defined(__BORLANDC__) || defined(_MSC_VER)
11# define snprintf _snprintf // C compilers have this in stdio.h
12#endif
13
9#define F_ASCII 0x00000001 14#define F_ASCII 0x00000001UL
15#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 16#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 17#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 18#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 19#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 20#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040
16#define F_ALLOW_NONREF 0x00000080 21#define F_ALLOW_NONREF 0x00000100UL
17#define F_SHRINK 0x00000100 22#define F_SHRINK 0x00000200UL
23#define F_MAXDEPTH 0xf8000000UL
24#define S_MAXDEPTH 27
25
26#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
27
28// F_SELFCONVERT? <=> to_json/toJson
29// F_BLESSED? <=> { $__class__$ => }
18 30
19#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 31#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20#define F_DEFAULT 0 32#define F_DEFAULT (9UL << S_MAXDEPTH)
21 33
22#define INIT_SIZE 32 // initial scalar size to be allocated 34#define INIT_SIZE 32 // initial scalar size to be allocated
35#define INDENT_STEP 3 // spaces per indentation level
36
37#define SHORT_STRING_LEN 512 // special-case strings of up to this size
23 38
24#define SB do { 39#define SB do {
25#define SE } while (0) 40#define SE } while (0)
26 41
42#if __GNUC__ >= 3
43# define expect(expr,value) __builtin_expect ((expr),(value))
44# define inline inline
45#else
46# define expect(expr,value) (expr)
47# define inline static
48#endif
49
50#define expect_false(expr) expect ((expr) != 0, 0)
51#define expect_true(expr) expect ((expr) != 0, 1)
52
27static HV *json_stash; 53static HV *json_stash; // JSON::XS::
54
55/////////////////////////////////////////////////////////////////////////////
56// utility functions
57
58static UV *
59SvJSON (SV *sv)
60{
61 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
62 croak ("object is not of type JSON::XS");
63
64 return &SvUVX (SvRV (sv));
65}
66
67static void
68shrink (SV *sv)
69{
70 sv_utf8_downgrade (sv, 1);
71 if (SvLEN (sv) > SvCUR (sv) + 1)
72 {
73#ifdef SvPV_shrink_to_cur
74 SvPV_shrink_to_cur (sv);
75#elif defined (SvPV_renew)
76 SvPV_renew (sv, SvCUR (sv) + 1);
77#endif
78 }
79}
80
81// decode an utf-8 character and return it, or (UV)-1 in
82// case of an error.
83// we special-case "safe" characters from U+80 .. U+7FF,
84// but use the very good perl function to parse anything else.
85// note that we never call this function for a ascii codepoints
86inline UV
87decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
88{
89 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
90 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
91 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
92 {
93 *clen = 2;
94 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
95 }
96 else
97 {
98 *clen = (STRLEN)-1;
99 return (UV)-1;
100 }
101}
102
103/////////////////////////////////////////////////////////////////////////////
104// encoder
28 105
29// structure used for encoding JSON 106// structure used for encoding JSON
30typedef struct 107typedef struct
31{ 108{
32 char *cur; 109 char *cur; // SvPVX (sv) + current output position
33 STRLEN len; // SvLEN (sv)
34 char *end; // SvEND (sv) 110 char *end; // SvEND (sv)
35 SV *sv; 111 SV *sv; // result scalar
36 UV flags; 112 U32 flags; // F_*
37 int max_recurse; 113 U32 indent; // indentation level
38 int indent; 114 U32 maxdepth; // max. indentation/recursion level
39} enc_t; 115} enc_t;
40 116
41// structure used for decoding JSON 117inline 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
59static void
60shrink (SV *sv)
61{
62 sv_utf8_downgrade (sv, 1);
63#ifdef SvPV_shrink_to_cur
64 SvPV_shrink_to_cur (sv);
65#endif
66}
67
68/////////////////////////////////////////////////////////////////////////////
69
70static void
71need (enc_t *enc, STRLEN len) 118need (enc_t *enc, STRLEN len)
72{ 119{
73 if (enc->cur + len >= enc->end) 120 if (expect_false (enc->cur + len >= enc->end))
74 { 121 {
75 STRLEN cur = enc->cur - SvPVX (enc->sv); 122 STRLEN cur = enc->cur - SvPVX (enc->sv);
76 SvGROW (enc->sv, cur + len + 1); 123 SvGROW (enc->sv, cur + len + 1);
77 enc->cur = SvPVX (enc->sv) + cur; 124 enc->cur = SvPVX (enc->sv) + cur;
78 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 125 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79 } 126 }
80} 127}
81 128
82static void 129inline void
83encode_ch (enc_t *enc, char ch) 130encode_ch (enc_t *enc, char ch)
84{ 131{
85 need (enc, 1); 132 need (enc, 1);
86 *enc->cur++ = ch; 133 *enc->cur++ = ch;
87} 134}
… …
95 142
96 while (str < end) 143 while (str < end)
97 { 144 {
98 unsigned char ch = *(unsigned char *)str; 145 unsigned char ch = *(unsigned char *)str;
99 146
100 if (ch >= 0x20 && ch < 0x80) // most common case 147 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101 { 148 {
102 if (ch == '"') // but with slow exceptions 149 if (expect_false (ch == '"')) // but with slow exceptions
103 { 150 {
104 need (enc, len += 1); 151 need (enc, len += 1);
105 *enc->cur++ = '\\'; 152 *enc->cur++ = '\\';
106 *enc->cur++ = '"'; 153 *enc->cur++ = '"';
107 } 154 }
108 else if (ch == '\\') 155 else if (expect_false (ch == '\\'))
109 { 156 {
110 need (enc, len += 1); 157 need (enc, len += 1);
111 *enc->cur++ = '\\'; 158 *enc->cur++ = '\\';
112 *enc->cur++ = '\\'; 159 *enc->cur++ = '\\';
113 } 160 }
… …
131 STRLEN clen; 178 STRLEN clen;
132 UV uch; 179 UV uch;
133 180
134 if (is_utf8) 181 if (is_utf8)
135 { 182 {
136 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 183 //uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
184 uch = decode_utf8 (str, end - str, &clen);
137 if (clen == (STRLEN)-1) 185 if (clen == (STRLEN)-1)
138 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str); 186 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139 } 187 }
140 else 188 else
141 { 189 {
… …
144 } 192 }
145 193
146 if (uch > 0x10FFFFUL) 194 if (uch > 0x10FFFFUL)
147 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch); 195 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
148 196
149 if (uch < 0x80 || enc->flags & F_ASCII) 197 if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
150 { 198 {
151 if (uch > 0xFFFFUL) 199 if (uch > 0xFFFFUL)
152 { 200 {
153 need (enc, len += 11); 201 need (enc, len += 11);
154 sprintf (enc->cur, "\\u%04x\\u%04x", 202 sprintf (enc->cur, "\\u%04x\\u%04x",
155 (uch - 0x10000) / 0x400 + 0xD800, 203 (int)((uch - 0x10000) / 0x400 + 0xD800),
156 (uch - 0x10000) % 0x400 + 0xDC00); 204 (int)((uch - 0x10000) % 0x400 + 0xDC00));
157 enc->cur += 12; 205 enc->cur += 12;
158 } 206 }
159 else 207 else
160 { 208 {
161 static char hexdigit [16] = "0123456789abcdef"; 209 static char hexdigit [16] = "0123456789abcdef";
… …
168 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 216 *enc->cur++ = hexdigit [(uch >> 0) & 15];
169 } 217 }
170 218
171 str += clen; 219 str += clen;
172 } 220 }
221 else if (enc->flags & F_LATIN1)
222 {
223 *enc->cur++ = uch;
224 str += clen;
225 }
173 else if (is_utf8) 226 else if (is_utf8)
174 { 227 {
175 need (enc, len += clen); 228 need (enc, len += clen);
176 do 229 do
177 { 230 {
… …
179 } 232 }
180 while (--clen); 233 while (--clen);
181 } 234 }
182 else 235 else
183 { 236 {
184 need (enc, len += 10); // never more than 11 bytes needed 237 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
185 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 238 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
186 ++str; 239 ++str;
187 } 240 }
188 } 241 }
189 } 242 }
… …
191 244
192 --len; 245 --len;
193 } 246 }
194} 247}
195 248
196#define INDENT SB \ 249inline void
250encode_indent (enc_t *enc)
251{
197 if (enc->flags & F_INDENT) \ 252 if (enc->flags & F_INDENT)
198 { \ 253 {
199 int i_; \ 254 int spaces = enc->indent * INDENT_STEP;
200 need (enc, enc->indent); \
201 for (i_ = enc->indent * 3; i_--; )\
202 encode_ch (enc, ' '); \
203 } \
204 SE
205 255
206#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 256 need (enc, spaces);
207#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 257 memset (enc->cur, ' ', spaces);
208#define COMMA SB \ 258 enc->cur += spaces;
259 }
260}
261
262inline void
263encode_space (enc_t *enc)
264{
265 need (enc, 1);
209 encode_ch (enc, ','); \ 266 encode_ch (enc, ' ');
267}
268
269inline void
270encode_nl (enc_t *enc)
271{
210 if (enc->flags & F_INDENT) \ 272 if (enc->flags & F_INDENT)
211 NL; \ 273 {
274 need (enc, 1);
275 encode_ch (enc, '\n');
276 }
277}
278
279inline void
280encode_comma (enc_t *enc)
281{
282 encode_ch (enc, ',');
283
284 if (enc->flags & F_INDENT)
285 encode_nl (enc);
212 else if (enc->flags & F_SPACE_AFTER) \ 286 else if (enc->flags & F_SPACE_AFTER)
213 SPACE; \ 287 encode_space (enc);
214 SE 288}
215 289
216static void encode_sv (enc_t *enc, SV *sv); 290static void encode_sv (enc_t *enc, SV *sv);
217 291
218static void 292static void
219encode_av (enc_t *enc, AV *av) 293encode_av (enc_t *enc, AV *av)
220{ 294{
221 int i, len = av_len (av); 295 int i, len = av_len (av);
222 296
223 encode_ch (enc, '['); NL; 297 if (enc->indent >= enc->maxdepth)
298 croak ("data structure too deep (hit recursion limit)");
299
300 encode_ch (enc, '['); encode_nl (enc);
224 ++enc->indent; 301 ++enc->indent;
225 302
226 for (i = 0; i <= len; ++i) 303 for (i = 0; i <= len; ++i)
227 { 304 {
228 INDENT; 305 encode_indent (enc);
229 encode_sv (enc, *av_fetch (av, i, 0)); 306 encode_sv (enc, *av_fetch (av, i, 0));
230 307
231 if (i < len) 308 if (i < len)
232 COMMA; 309 encode_comma (enc);
233 } 310 }
234 311
235 NL; 312 encode_nl (enc);
236 313
237 --enc->indent; 314 --enc->indent;
238 INDENT; encode_ch (enc, ']'); 315 encode_indent (enc); encode_ch (enc, ']');
239} 316}
240 317
241static void 318static void
242encode_he (enc_t *enc, HE *he) 319encode_he (enc_t *enc, HE *he)
243{ 320{
… …
257 else 334 else
258 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 335 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
259 336
260 encode_ch (enc, '"'); 337 encode_ch (enc, '"');
261 338
262 if (enc->flags & F_SPACE_BEFORE) SPACE; 339 if (enc->flags & F_SPACE_BEFORE) encode_space (enc);
263 encode_ch (enc, ':'); 340 encode_ch (enc, ':');
264 if (enc->flags & F_SPACE_AFTER ) SPACE; 341 if (enc->flags & F_SPACE_AFTER ) encode_space (enc);
265 encode_sv (enc, HeVAL (he)); 342 encode_sv (enc, HeVAL (he));
266} 343}
267 344
268// compare hash entries, used when all keys are bytestrings 345// compare hash entries, used when all keys are bytestrings
269static int 346static int
… …
275 HE *b = *(HE **)b_; 352 HE *b = *(HE **)b_;
276 353
277 STRLEN la = HeKLEN (a); 354 STRLEN la = HeKLEN (a);
278 STRLEN lb = HeKLEN (b); 355 STRLEN lb = HeKLEN (b);
279 356
280 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 357 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
281 cmp = la < lb ? -1 : la == lb ? 0 : 1; 358 cmp = la - lb;
282 359
283 return cmp; 360 return cmp;
284} 361}
285 362
286// compare hash entries, used when some keys are sv's or utf-x 363// compare hash entries, used when some keys are sv's or utf-x
… …
293static void 370static void
294encode_hv (enc_t *enc, HV *hv) 371encode_hv (enc_t *enc, HV *hv)
295{ 372{
296 int count, i; 373 int count, i;
297 374
375 if (enc->indent >= enc->maxdepth)
376 croak ("data structure too deep (hit recursion limit)");
377
298 encode_ch (enc, '{'); NL; ++enc->indent; 378 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
299 379
300 if ((count = hv_iterinit (hv))) 380 if ((count = hv_iterinit (hv)))
301 { 381 {
302 // for canonical output we have to sort by keys first 382 // for canonical output we have to sort by keys first
303 // actually, this is mostly due to the stupid so-called 383 // actually, this is mostly due to the stupid so-called
304 // security workaround added somewhere in 5.8.x. 384 // security workaround added somewhere in 5.8.x.
305 // that randomises hash orderings 385 // that randomises hash orderings
306 if (enc->flags & F_CANONICAL) 386 if (enc->flags & F_CANONICAL)
307 { 387 {
308 HE *he, *hes [count];
309 int fast = 1; 388 int fast = 1;
389 HE *he;
390#if defined(__BORLANDC__) || defined(_MSC_VER)
391 HE **hes = _alloca (count * sizeof (HE));
392#else
393 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
394#endif
310 395
311 i = 0; 396 i = 0;
312 while ((he = hv_iternext (hv))) 397 while ((he = hv_iternext (hv)))
313 { 398 {
314 hes [i++] = he; 399 hes [i++] = he;
… …
338 LEAVE; 423 LEAVE;
339 } 424 }
340 425
341 for (i = 0; i < count; ++i) 426 for (i = 0; i < count; ++i)
342 { 427 {
343 INDENT; 428 encode_indent (enc);
344 encode_he (enc, hes [i]); 429 encode_he (enc, hes [i]);
345 430
346 if (i < count - 1) 431 if (i < count - 1)
347 COMMA; 432 encode_comma (enc);
348 } 433 }
349 434
350 NL; 435 encode_nl (enc);
351 } 436 }
352 else 437 else
353 { 438 {
354 SV *sv;
355 HE *he = hv_iternext (hv); 439 HE *he = hv_iternext (hv);
356 440
357 for (;;) 441 for (;;)
358 { 442 {
359 INDENT; 443 encode_indent (enc);
360 encode_he (enc, he); 444 encode_he (enc, he);
361 445
362 if (!(he = hv_iternext (hv))) 446 if (!(he = hv_iternext (hv)))
363 break; 447 break;
364 448
365 COMMA; 449 encode_comma (enc);
366 } 450 }
367 451
368 NL; 452 encode_nl (enc);
369 } 453 }
370 } 454 }
371 455
372 --enc->indent; INDENT; encode_ch (enc, '}'); 456 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
457}
458
459// encode objects, arrays and special \0=false and \1=true values.
460static void
461encode_rv (enc_t *enc, SV *sv)
462{
463 svtype svt;
464
465 SvGETMAGIC (sv);
466 svt = SvTYPE (sv);
467
468 if (svt == SVt_PVHV)
469 encode_hv (enc, (HV *)sv);
470 else if (svt == SVt_PVAV)
471 encode_av (enc, (AV *)sv);
472 else if (svt < SVt_PVAV)
473 {
474 if (SvNIOK (sv) && SvIV (sv) == 0)
475 encode_str (enc, "false", 5, 0);
476 else if (SvNIOK (sv) && SvIV (sv) == 1)
477 encode_str (enc, "true", 4, 0);
478 else
479 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
480 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
481 }
482 else
483 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
484 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
373} 485}
374 486
375static void 487static void
376encode_sv (enc_t *enc, SV *sv) 488encode_sv (enc_t *enc, SV *sv)
377{ 489{
… …
391 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 503 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
392 enc->cur += strlen (enc->cur); 504 enc->cur += strlen (enc->cur);
393 } 505 }
394 else if (SvIOKp (sv)) 506 else if (SvIOKp (sv))
395 { 507 {
508 // we assume we can always read an IV as a UV
509 if (SvUV (sv) & ~(UV)0x7fff)
510 {
396 need (enc, 64); 511 need (enc, 32);
397 enc->cur += 512 enc->cur +=
398 SvIsUV(sv) 513 SvIsUV(sv)
399 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 514 ? snprintf (enc->cur, 32, "%"UVuf, (UV)SvUVX (sv))
400 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 515 : snprintf (enc->cur, 32, "%"IVdf, (IV)SvIVX (sv));
516 }
517 else
518 {
519 // optimise the "small number case"
520 // code will likely be branchless and use only a single multiplication
521 I32 i = SvIV (sv);
522 U32 u;
523
524 need (enc, 6);
525
526 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
527 u = i < 0 ? -i : i;
528
529 // convert to 4.28 fixed-point representation
530 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
531
532 char digit, nz = 0;
533
534 digit = u >> 28; *enc->cur = digit + '0'; nz |= digit; enc->cur += nz ? 1 : 0; u = (u & 0xfffffff) * 5;
535 digit = u >> 27; *enc->cur = digit + '0'; nz |= digit; enc->cur += nz ? 1 : 0; u = (u & 0x7ffffff) * 5;
536 digit = u >> 26; *enc->cur = digit + '0'; nz |= digit; enc->cur += nz ? 1 : 0; u = (u & 0x3ffffff) * 5;
537 digit = u >> 25; *enc->cur = digit + '0'; nz |= digit; enc->cur += nz ? 1 : 0; u = (u & 0x1ffffff) * 5;
538 digit = u >> 24; *enc->cur = digit + '0'; nz |= digit; enc->cur += 1;
539 }
401 } 540 }
402 else if (SvROK (sv)) 541 else if (SvROK (sv))
403 { 542 encode_rv (enc, SvRV (sv));
404 SV *rv = SvRV (sv);
405
406 if (!--enc->max_recurse)
407 croak ("data structure too deep (hit recursion limit)");
408
409 switch (SvTYPE (rv))
410 {
411 case SVt_PVAV: encode_av (enc, (AV *)rv); break;
412 case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
413
414 default:
415 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
416 SvPV_nolen (sv));
417 }
418 }
419 else if (!SvOK (sv)) 543 else if (!SvOK (sv))
420 encode_str (enc, "null", 4, 0); 544 encode_str (enc, "null", 4, 0);
421 else 545 else
422 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this", 546 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
423 SvPV_nolen (sv), SvFLAGS (sv)); 547 SvPV_nolen (sv), SvFLAGS (sv));
424} 548}
425 549
426static SV * 550static SV *
427encode_json (SV *scalar, UV flags) 551encode_json (SV *scalar, U32 flags)
428{ 552{
553 enc_t enc;
554
429 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar)) 555 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
430 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)"); 556 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
431 557
432 enc_t enc;
433 enc.flags = flags; 558 enc.flags = flags;
434 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 559 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
435 enc.cur = SvPVX (enc.sv); 560 enc.cur = SvPVX (enc.sv);
436 enc.end = SvEND (enc.sv); 561 enc.end = SvEND (enc.sv);
437 enc.max_recurse = 0;
438 enc.indent = 0; 562 enc.indent = 0;
563 enc.maxdepth = DEC_DEPTH (flags);
439 564
440 SvPOK_only (enc.sv); 565 SvPOK_only (enc.sv);
441 encode_sv (&enc, scalar); 566 encode_sv (&enc, scalar);
442 567
568 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
569 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
570
443 if (!(flags & (F_ASCII | F_UTF8))) 571 if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))
444 SvUTF8_on (enc.sv); 572 SvUTF8_on (enc.sv);
445
446 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
447 573
448 if (enc.flags & F_SHRINK) 574 if (enc.flags & F_SHRINK)
449 shrink (enc.sv); 575 shrink (enc.sv);
450 576
451 return enc.sv; 577 return enc.sv;
452} 578}
453 579
454///////////////////////////////////////////////////////////////////////////// 580/////////////////////////////////////////////////////////////////////////////
581// decoder
455 582
456#define WS \ 583// structure used for decoding JSON
584typedef struct
585{
586 char *cur; // current parser pointer
587 char *end; // end of input string
588 const char *err; // parse error, if != 0
589 U32 flags; // F_*
590 U32 depth; // recursion depth
591 U32 maxdepth; // recursion depth limit
592} dec_t;
593
594inline void
595decode_ws (dec_t *dec)
596{
457 for (;;) \ 597 for (;;)
458 { \ 598 {
459 char ch = *dec->cur; \ 599 char ch = *dec->cur;
600
460 if (ch > 0x20 \ 601 if (ch > 0x20
461 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 602 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
462 break; \ 603 break;
604
463 ++dec->cur; \ 605 ++dec->cur;
464 } 606 }
607}
465 608
466#define ERR(reason) SB dec->err = reason; goto fail; SE 609#define ERR(reason) SB dec->err = reason; goto fail; SE
610
467#define EXPECT_CH(ch) SB \ 611#define EXPECT_CH(ch) SB \
468 if (*dec->cur != ch) \ 612 if (*dec->cur != ch) \
469 ERR (# ch " expected"); \ 613 ERR (# ch " expected"); \
470 ++dec->cur; \ 614 ++dec->cur; \
471 SE 615 SE
472 616
617#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
618#define DEC_DEC_DEPTH --dec->depth
619
473static SV *decode_sv (dec_t *dec); 620static SV *decode_sv (dec_t *dec);
474 621
475static signed char decode_hexdigit[256]; 622static signed char decode_hexdigit[256];
476 623
477static UV 624static UV
478decode_4hex (dec_t *dec) 625decode_4hex (dec_t *dec)
479{ 626{
480 signed char d1, d2, d3, d4; 627 signed char d1, d2, d3, d4;
628 unsigned char *cur = (unsigned char *)dec->cur;
481 629
482 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 630 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("four hexadecimal digits expected");
483 if (d1 < 0) ERR ("four hexadecimal digits expected"); 631 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("four hexadecimal digits expected");
484 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 632 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("four hexadecimal digits expected");
485 if (d2 < 0) ERR ("four hexadecimal digits expected"); 633 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("four hexadecimal digits expected");
486 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
487 if (d3 < 0) ERR ("four hexadecimal digits expected");
488 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
489 if (d4 < 0) ERR ("four hexadecimal digits expected");
490 634
491 dec->cur += 4; 635 dec->cur += 4;
492 636
493 return ((UV)d1) << 12 637 return ((UV)d1) << 12
494 | ((UV)d2) << 8 638 | ((UV)d2) << 8
… …
497 641
498fail: 642fail:
499 return (UV)-1; 643 return (UV)-1;
500} 644}
501 645
502#define APPEND_GROW(n) SB \
503 if (cur + (n) >= end) \
504 { \
505 STRLEN ofs = cur - SvPVX (sv); \
506 SvGROW (sv, ofs + (n) + 1); \
507 cur = SvPVX (sv) + ofs; \
508 end = SvEND (sv); \
509 } \
510 SE
511
512#define APPEND_CH(ch) SB \
513 APPEND_GROW (1); \
514 *cur++ = (ch); \
515 SE
516
517static SV * 646static SV *
518decode_str (dec_t *dec) 647decode_str (dec_t *dec)
519{ 648{
520 SV *sv = NEWSV (0,2); 649 SV *sv = 0;
521 int utf8 = 0; 650 int utf8 = 0;
522 char *cur = SvPVX (sv);
523 char *end = SvEND (sv);
524 651
525 for (;;) 652 do
526 { 653 {
527 unsigned char ch = *(unsigned char *)dec->cur; 654 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
655 char *cur = buf;
528 656
529 if (ch == '"') 657 do
530 break;
531 else if (ch == '\\')
532 { 658 {
533 switch (*++dec->cur) 659 unsigned char ch = *(unsigned char *)dec->cur++;
660
661 if (expect_false (ch == '"'))
534 { 662 {
535 case '\\': 663 --dec->cur;
536 case '/': 664 break;
537 case '"': APPEND_CH (*dec->cur++); break; 665 }
538 666 else if (expect_false (ch == '\\'))
539 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 667 {
540 case 't': APPEND_CH ('\011'); ++dec->cur; break; 668 switch (*dec->cur)
541 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
542 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
543 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
544
545 case 'u':
546 { 669 {
547 UV lo, hi; 670 case '\\':
548 ++dec->cur; 671 case '/':
672 case '"': *cur++ = *dec->cur++; break;
549 673
550 hi = decode_4hex (dec); 674 case 'b': ++dec->cur; *cur++ = '\010'; break;
551 if (hi == (UV)-1) 675 case 't': ++dec->cur; *cur++ = '\011'; break;
552 goto fail; 676 case 'n': ++dec->cur; *cur++ = '\012'; break;
677 case 'f': ++dec->cur; *cur++ = '\014'; break;
678 case 'r': ++dec->cur; *cur++ = '\015'; break;
553 679
554 // possibly a surrogate pair 680 case 'u':
555 if (hi >= 0xd800 && hi < 0xdc00)
556 { 681 {
557 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 682 UV lo, hi;
558 ERR ("missing low surrogate character in surrogate pair");
559
560 dec->cur += 2; 683 ++dec->cur;
561 684
562 lo = decode_4hex (dec); 685 hi = decode_4hex (dec);
563 if (lo == (UV)-1) 686 if (hi == (UV)-1)
564 goto fail; 687 goto fail;
565 688
689 // possibly a surrogate pair
690 if (hi >= 0xd800)
691 if (hi < 0xdc00)
692 {
693 if (dec->cur [0] != '\\' || dec->cur [1] != 'u')
694 ERR ("missing low surrogate character in surrogate pair");
695
696 dec->cur += 2;
697
698 lo = decode_4hex (dec);
699 if (lo == (UV)-1)
700 goto fail;
701
566 if (lo < 0xdc00 || lo >= 0xe000) 702 if (lo < 0xdc00 || lo >= 0xe000)
567 ERR ("surrogate pair expected"); 703 ERR ("surrogate pair expected");
568 704
569 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 705 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
706 }
707 else if (hi < 0xe000)
708 ERR ("missing high surrogate character in surrogate pair");
709
710 if (hi >= 0x80)
711 {
712 utf8 = 1;
713
714 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
715 }
716 else
717 *cur++ = hi;
570 } 718 }
571 else if (hi >= 0xdc00 && hi < 0xe000)
572 ERR ("missing high surrogate character in surrogate pair");
573
574 if (hi >= 0x80)
575 { 719 break;
576 utf8 = 1;
577 720
578 APPEND_GROW (4); // at most 4 bytes for 21 bits
579 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
580 }
581 else 721 default:
582 APPEND_CH (hi); 722 --dec->cur;
723 ERR ("illegal backslash escape sequence in string");
583 } 724 }
584 break; 725 }
726 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
727 *cur++ = ch;
728 else if (ch >= 0x80)
729 {
730 STRLEN clen;
731 UV uch;
585 732
586 default:
587 --dec->cur; 733 --dec->cur;
588 ERR ("illegal backslash escape sequence in string"); 734
735 uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);
736 if (clen == (STRLEN)-1)
737 ERR ("malformed UTF-8 character in JSON string");
738
739 do
740 *cur++ = *dec->cur++;
741 while (--clen);
742
743 utf8 = 1;
744 }
745 else
746 {
747 --dec->cur;
748
749 if (!ch)
750 ERR ("unexpected end of string while parsing JSON string");
751 else
752 ERR ("invalid character encountered while parsing JSON string");
589 } 753 }
590 } 754 }
591 else if (ch >= 0x20 && ch <= 0x7f) 755 while (cur < buf + SHORT_STRING_LEN);
592 APPEND_CH (*dec->cur++); 756
593 else if (ch >= 0x80)
594 { 757 {
595 STRLEN clen; 758 STRLEN len = cur - buf;
596 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
597 if (clen == (STRLEN)-1)
598 ERR ("malformed UTF-8 character in JSON string");
599 759
600 APPEND_GROW (clen); 760 if (sv)
601 do
602 { 761 {
603 *cur++ = *dec->cur++; 762 SvGROW (sv, SvCUR (sv) + len + 1);
763 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
764 SvCUR_set (sv, SvCUR (sv) + len);
604 } 765 }
605 while (--clen);
606
607 utf8 = 1;
608 }
609 else if (dec->cur == dec->end)
610 ERR ("unexpected end of string while parsing json string");
611 else 766 else
612 ERR ("invalid character encountered"); 767 sv = newSVpvn (buf, len);
613 } 768 }
769 }
770 while (*dec->cur != '"');
614 771
615 ++dec->cur; 772 ++dec->cur;
616 773
617 SvCUR_set (sv, cur - SvPVX (sv)); 774 if (sv)
618 775 {
619 SvPOK_only (sv); 776 SvPOK_only (sv);
620 *SvEND (sv) = 0; 777 *SvEND (sv) = 0;
621 778
622 if (utf8) 779 if (utf8)
623 SvUTF8_on (sv); 780 SvUTF8_on (sv);
624 781 }
625 if (dec->flags & F_SHRINK) 782 else
626 shrink (sv); 783 sv = newSVpvn ("", 0);
627 784
628 return sv; 785 return sv;
629 786
630fail: 787fail:
631 SvREFCNT_dec (sv);
632 return 0; 788 return 0;
633} 789}
634 790
635static SV * 791static SV *
636decode_num (dec_t *dec) 792decode_num (dec_t *dec)
… …
694 is_nv = 1; 850 is_nv = 1;
695 } 851 }
696 852
697 if (!is_nv) 853 if (!is_nv)
698 { 854 {
699 UV uv; 855 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
700 int numtype = grok_number (start, dec->cur - start, &uv); 856 if (*start == '-')
701 if (numtype & IS_NUMBER_IN_UV) 857 switch (dec->cur - start)
702 if (numtype & IS_NUMBER_NEG)
703 { 858 {
704 if (uv < (UV)IV_MIN) 859 case 2: return newSViv (-( start [1] - '0' ));
705 return newSViv (-(IV)uv); 860 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
861 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
862 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
706 } 863 }
864 else
865 switch (dec->cur - start)
866 {
867 case 1: return newSViv ( start [0] - '0' );
868 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
869 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
870 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
871 }
872
873 {
874 UV uv;
875 int numtype = grok_number (start, dec->cur - start, &uv);
876 if (numtype & IS_NUMBER_IN_UV)
877 if (numtype & IS_NUMBER_NEG)
878 {
879 if (uv < (UV)IV_MIN)
880 return newSViv (-(IV)uv);
881 }
707 else 882 else
708 return newSVuv (uv); 883 return newSVuv (uv);
884 }
709 } 885 }
710 886
711 return newSVnv (Atof (start)); 887 return newSVnv (Atof (start));
712 888
713fail: 889fail:
… …
717static SV * 893static SV *
718decode_av (dec_t *dec) 894decode_av (dec_t *dec)
719{ 895{
720 AV *av = newAV (); 896 AV *av = newAV ();
721 897
722 WS; 898 DEC_INC_DEPTH;
899 decode_ws (dec);
900
723 if (*dec->cur == ']') 901 if (*dec->cur == ']')
724 ++dec->cur; 902 ++dec->cur;
725 else 903 else
726 for (;;) 904 for (;;)
727 { 905 {
… …
731 if (!value) 909 if (!value)
732 goto fail; 910 goto fail;
733 911
734 av_push (av, value); 912 av_push (av, value);
735 913
736 WS; 914 decode_ws (dec);
737 915
738 if (*dec->cur == ']') 916 if (*dec->cur == ']')
739 { 917 {
740 ++dec->cur; 918 ++dec->cur;
741 break; 919 break;
… …
745 ERR (", or ] expected while parsing array"); 923 ERR (", or ] expected while parsing array");
746 924
747 ++dec->cur; 925 ++dec->cur;
748 } 926 }
749 927
928 DEC_DEC_DEPTH;
750 return newRV_noinc ((SV *)av); 929 return newRV_noinc ((SV *)av);
751 930
752fail: 931fail:
753 SvREFCNT_dec (av); 932 SvREFCNT_dec (av);
933 DEC_DEC_DEPTH;
754 return 0; 934 return 0;
755} 935}
756 936
757static SV * 937static SV *
758decode_hv (dec_t *dec) 938decode_hv (dec_t *dec)
759{ 939{
760 HV *hv = newHV (); 940 HV *hv = newHV ();
761 941
762 WS; 942 DEC_INC_DEPTH;
943 decode_ws (dec);
944
763 if (*dec->cur == '}') 945 if (*dec->cur == '}')
764 ++dec->cur; 946 ++dec->cur;
765 else 947 else
766 for (;;) 948 for (;;)
767 { 949 {
768 SV *key, *value; 950 SV *key, *value;
769 951
770 WS; EXPECT_CH ('"'); 952 decode_ws (dec); EXPECT_CH ('"');
771 953
772 key = decode_str (dec); 954 key = decode_str (dec);
773 if (!key) 955 if (!key)
774 goto fail; 956 goto fail;
775 957
776 WS; EXPECT_CH (':'); 958 decode_ws (dec); EXPECT_CH (':');
777 959
778 value = decode_sv (dec); 960 value = decode_sv (dec);
779 if (!value) 961 if (!value)
780 { 962 {
781 SvREFCNT_dec (key); 963 SvREFCNT_dec (key);
782 goto fail; 964 goto fail;
783 } 965 }
784 966
785 //TODO: optimise
786 hv_store_ent (hv, key, value, 0); 967 hv_store_ent (hv, key, value, 0);
968 SvREFCNT_dec (key);
787 969
788 WS; 970 decode_ws (dec);
789 971
790 if (*dec->cur == '}') 972 if (*dec->cur == '}')
791 { 973 {
792 ++dec->cur; 974 ++dec->cur;
793 break; 975 break;
… …
797 ERR (", or } expected while parsing object/hash"); 979 ERR (", or } expected while parsing object/hash");
798 980
799 ++dec->cur; 981 ++dec->cur;
800 } 982 }
801 983
984 DEC_DEC_DEPTH;
802 return newRV_noinc ((SV *)hv); 985 return newRV_noinc ((SV *)hv);
803 986
804fail: 987fail:
805 SvREFCNT_dec (hv); 988 SvREFCNT_dec (hv);
989 DEC_DEC_DEPTH;
806 return 0; 990 return 0;
807} 991}
808 992
809static SV * 993static SV *
810decode_sv (dec_t *dec) 994decode_sv (dec_t *dec)
811{ 995{
812 WS; 996 decode_ws (dec);
813 switch (*dec->cur) 997 switch (*dec->cur)
814 { 998 {
815 case '"': ++dec->cur; return decode_str (dec); 999 case '"': ++dec->cur; return decode_str (dec);
816 case '[': ++dec->cur; return decode_av (dec); 1000 case '[': ++dec->cur; return decode_av (dec);
817 case '{': ++dec->cur; return decode_hv (dec); 1001 case '{': ++dec->cur; return decode_hv (dec);
… …
853 ERR ("'null' expected"); 1037 ERR ("'null' expected");
854 1038
855 break; 1039 break;
856 1040
857 default: 1041 default:
858 ERR ("malformed json string, neither array, object, number, string or atom"); 1042 ERR ("malformed JSON string, neither array, object, number, string or atom");
859 break; 1043 break;
860 } 1044 }
861 1045
862fail: 1046fail:
863 return 0; 1047 return 0;
864} 1048}
865 1049
866static SV * 1050static SV *
867decode_json (SV *string, UV flags) 1051decode_json (SV *string, U32 flags, UV *offset_return)
868{ 1052{
1053 dec_t dec;
1054 UV offset;
869 SV *sv; 1055 SV *sv;
1056
1057 SvGETMAGIC (string);
1058 SvUPGRADE (string, SVt_PV);
870 1059
871 if (flags & F_UTF8) 1060 if (flags & F_UTF8)
872 sv_utf8_downgrade (string, 0); 1061 sv_utf8_downgrade (string, 0);
873 else 1062 else
874 sv_utf8_upgrade (string); 1063 sv_utf8_upgrade (string);
875 1064
876 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1065 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
877 1066
878 dec_t dec;
879 dec.flags = flags; 1067 dec.flags = flags;
880 dec.cur = SvPVX (string); 1068 dec.cur = SvPVX (string);
881 dec.end = SvEND (string); 1069 dec.end = SvEND (string);
882 dec.err = 0; 1070 dec.err = 0;
1071 dec.depth = 0;
1072 dec.maxdepth = DEC_DEPTH (dec.flags);
883 1073
1074 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
884 sv = decode_sv (&dec); 1075 sv = decode_sv (&dec);
885 1076
1077 if (!(offset_return || !sv))
1078 {
1079 // check for trailing garbage
1080 decode_ws (&dec);
1081
1082 if (*dec.cur)
1083 {
1084 dec.err = "garbage after JSON object";
1085 SvREFCNT_dec (sv);
1086 sv = 0;
1087 }
1088 }
1089
1090 if (offset_return || !sv)
1091 {
1092 offset = dec.flags & F_UTF8
1093 ? dec.cur - SvPVX (string)
1094 : utf8_distance (dec.cur, SvPVX (string));
1095
1096 if (offset_return)
1097 *offset_return = offset;
1098 }
1099
886 if (!sv) 1100 if (!sv)
887 { 1101 {
888 IV offset = dec.flags & F_UTF8
889 ? dec.cur - SvPVX (string)
890 : utf8_distance (dec.cur, SvPVX (string));
891 SV *uni = sv_newmortal (); 1102 SV *uni = sv_newmortal ();
892 1103
893 // horrible hack to silence warning inside pv_uni_display 1104 // horrible hack to silence warning inside pv_uni_display
894 COP cop = *PL_curcop; 1105 COP cop = *PL_curcop;
895 cop.cop_warnings = pWARN_NONE; 1106 cop.cop_warnings = pWARN_NONE;
… …
897 SAVEVPTR (PL_curcop); 1108 SAVEVPTR (PL_curcop);
898 PL_curcop = &cop; 1109 PL_curcop = &cop;
899 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1110 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
900 LEAVE; 1111 LEAVE;
901 1112
902 croak ("%s, at character offset %d (%s)", 1113 croak ("%s, at character offset %d [\"%s\"]",
903 dec.err, 1114 dec.err,
904 (int)offset, 1115 (int)offset,
905 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1116 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
906 } 1117 }
907 1118
… …
911 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)"); 1122 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
912 1123
913 return sv; 1124 return sv;
914} 1125}
915 1126
1127/////////////////////////////////////////////////////////////////////////////
1128// XS interface functions
1129
916MODULE = JSON::XS PACKAGE = JSON::XS 1130MODULE = JSON::XS PACKAGE = JSON::XS
917 1131
918BOOT: 1132BOOT:
919{ 1133{
920 int i; 1134 int i;
921 1135
922 memset (decode_hexdigit, 0xff, 256); 1136 memset (decode_hexdigit, 0xff, 256);
1137
923 for (i = 10; i--; ) 1138 for (i = 0; i < 256; ++i)
924 decode_hexdigit ['0' + i] = i; 1139 decode_hexdigit [i] =
925 1140 i >= '0' && i <= '9' ? i - '0'
926 for (i = 7; i--; ) 1141 : i >= 'a' && i <= 'f' ? i - 'a' + 10
927 { 1142 : i >= 'A' && i <= 'F' ? i - 'A' + 10
928 decode_hexdigit ['a' + i] = 10 + i; 1143 : -1;
929 decode_hexdigit ['A' + i] = 10 + i;
930 }
931 1144
932 json_stash = gv_stashpv ("JSON::XS", 1); 1145 json_stash = gv_stashpv ("JSON::XS", 1);
933} 1146}
934 1147
935PROTOTYPES: DISABLE 1148PROTOTYPES: DISABLE
… …
941 RETVAL 1154 RETVAL
942 1155
943SV *ascii (SV *self, int enable = 1) 1156SV *ascii (SV *self, int enable = 1)
944 ALIAS: 1157 ALIAS:
945 ascii = F_ASCII 1158 ascii = F_ASCII
1159 latin1 = F_LATIN1
946 utf8 = F_UTF8 1160 utf8 = F_UTF8
947 indent = F_INDENT 1161 indent = F_INDENT
948 canonical = F_CANONICAL 1162 canonical = F_CANONICAL
949 space_before = F_SPACE_BEFORE 1163 space_before = F_SPACE_BEFORE
950 space_after = F_SPACE_AFTER 1164 space_after = F_SPACE_AFTER
951 json_rpc = F_JSON_RPC
952 pretty = F_PRETTY 1165 pretty = F_PRETTY
953 allow_nonref = F_ALLOW_NONREF 1166 allow_nonref = F_ALLOW_NONREF
954 shrink = F_SHRINK 1167 shrink = F_SHRINK
955 CODE: 1168 CODE:
956{ 1169{
… …
963 RETVAL = newSVsv (self); 1176 RETVAL = newSVsv (self);
964} 1177}
965 OUTPUT: 1178 OUTPUT:
966 RETVAL 1179 RETVAL
967 1180
1181SV *max_depth (SV *self, UV max_depth = 0x80000000UL)
1182 CODE:
1183{
1184 UV *uv = SvJSON (self);
1185 UV log2 = 0;
1186
1187 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1188
1189 while ((1UL << log2) < max_depth)
1190 ++log2;
1191
1192 *uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1193
1194 RETVAL = newSVsv (self);
1195}
1196 OUTPUT:
1197 RETVAL
1198
968void encode (SV *self, SV *scalar) 1199void encode (SV *self, SV *scalar)
969 PPCODE: 1200 PPCODE:
970 XPUSHs (encode_json (scalar, *SvJSON (self))); 1201 XPUSHs (encode_json (scalar, *SvJSON (self)));
971 1202
972void decode (SV *self, SV *jsonstr) 1203void decode (SV *self, SV *jsonstr)
973 PPCODE: 1204 PPCODE:
974 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1205 XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1206
1207void decode_prefix (SV *self, SV *jsonstr)
1208 PPCODE:
1209{
1210 UV offset;
1211 EXTEND (SP, 2);
1212 PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));
1213 PUSHs (sv_2mortal (newSVuv (offset)));
1214}
975 1215
976PROTOTYPES: ENABLE 1216PROTOTYPES: ENABLE
977 1217
978void to_json (SV *scalar) 1218void to_json (SV *scalar)
1219 ALIAS:
1220 objToJson = 0
979 PPCODE: 1221 PPCODE:
980 XPUSHs (encode_json (scalar, F_UTF8)); 1222 XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
981 1223
982void from_json (SV *jsonstr) 1224void from_json (SV *jsonstr)
1225 ALIAS:
1226 jsonToObj = 0
983 PPCODE: 1227 PPCODE:
984 XPUSHs (decode_json (jsonstr, F_UTF8)); 1228 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
985 1229

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