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Comparing JSON-XS/XS.xs (file contents):
Revision 1.8 by root, Fri Mar 23 16:13:59 2007 UTC vs.
Revision 1.40 by root, Tue Jun 12 01:27:02 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 16384 // 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 = decode_utf8 (str, end - str, &clen);
137 if (clen == (STRLEN)-1) 184 if (clen == (STRLEN)-1)
138 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 185 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139 } 186 }
140 else 187 else
141 { 188 {
142 uch = ch; 189 uch = ch;
143 clen = 1; 190 clen = 1;
144 } 191 }
145 192
146 if (uch < 0x80 || enc->flags & F_ASCII) 193 if (uch > 0x10FFFFUL)
194 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
195
196 if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
147 { 197 {
148 if (uch > 0xFFFFUL) 198 if (uch > 0xFFFFUL)
149 { 199 {
150 need (enc, len += 11); 200 need (enc, len += 11);
151 sprintf (enc->cur, "\\u%04x\\u%04x", 201 sprintf (enc->cur, "\\u%04x\\u%04x",
152 (uch - 0x10000) / 0x400 + 0xD800, 202 (int)((uch - 0x10000) / 0x400 + 0xD800),
153 (uch - 0x10000) % 0x400 + 0xDC00); 203 (int)((uch - 0x10000) % 0x400 + 0xDC00));
154 enc->cur += 12; 204 enc->cur += 12;
155 } 205 }
156 else 206 else
157 { 207 {
158 static char hexdigit [16] = "0123456789abcdef"; 208 static char hexdigit [16] = "0123456789abcdef";
… …
165 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 215 *enc->cur++ = hexdigit [(uch >> 0) & 15];
166 } 216 }
167 217
168 str += clen; 218 str += clen;
169 } 219 }
220 else if (enc->flags & F_LATIN1)
221 {
222 *enc->cur++ = uch;
223 str += clen;
224 }
170 else if (is_utf8) 225 else if (is_utf8)
171 { 226 {
172 need (enc, len += clen); 227 need (enc, len += clen);
173 do 228 do
174 { 229 {
… …
176 } 231 }
177 while (--clen); 232 while (--clen);
178 } 233 }
179 else 234 else
180 { 235 {
181 need (enc, len += 10); // never more than 11 bytes needed 236 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
182 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 237 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
183 ++str; 238 ++str;
184 } 239 }
185 } 240 }
186 } 241 }
… …
188 243
189 --len; 244 --len;
190 } 245 }
191} 246}
192 247
193#define INDENT SB \ 248inline void
249encode_indent (enc_t *enc)
250{
194 if (enc->flags & F_INDENT) \ 251 if (enc->flags & F_INDENT)
195 { \ 252 {
196 int i_; \ 253 int spaces = enc->indent * INDENT_STEP;
197 need (enc, enc->indent); \
198 for (i_ = enc->indent * 3; i_--; )\
199 encode_ch (enc, ' '); \
200 } \
201 SE
202 254
203#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 255 need (enc, spaces);
204#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 256 memset (enc->cur, ' ', spaces);
205#define COMMA SB \ 257 enc->cur += spaces;
258 }
259}
260
261inline void
262encode_space (enc_t *enc)
263{
264 need (enc, 1);
206 encode_ch (enc, ','); \ 265 encode_ch (enc, ' ');
266}
267
268inline void
269encode_nl (enc_t *enc)
270{
207 if (enc->flags & F_INDENT) \ 271 if (enc->flags & F_INDENT)
208 NL; \ 272 {
273 need (enc, 1);
274 encode_ch (enc, '\n');
275 }
276}
277
278inline void
279encode_comma (enc_t *enc)
280{
281 encode_ch (enc, ',');
282
283 if (enc->flags & F_INDENT)
284 encode_nl (enc);
209 else if (enc->flags & F_SPACE_AFTER) \ 285 else if (enc->flags & F_SPACE_AFTER)
210 SPACE; \ 286 encode_space (enc);
211 SE 287}
212 288
213static void encode_sv (enc_t *enc, SV *sv); 289static void encode_sv (enc_t *enc, SV *sv);
214 290
215static void 291static void
216encode_av (enc_t *enc, AV *av) 292encode_av (enc_t *enc, AV *av)
217{ 293{
218 int i, len = av_len (av); 294 int i, len = av_len (av);
219 295
220 encode_ch (enc, '['); NL; 296 if (enc->indent >= enc->maxdepth)
297 croak ("data structure too deep (hit recursion limit)");
298
299 encode_ch (enc, '['); encode_nl (enc);
221 ++enc->indent; 300 ++enc->indent;
222 301
223 for (i = 0; i <= len; ++i) 302 for (i = 0; i <= len; ++i)
224 { 303 {
225 INDENT; 304 encode_indent (enc);
226 encode_sv (enc, *av_fetch (av, i, 0)); 305 encode_sv (enc, *av_fetch (av, i, 0));
227 306
228 if (i < len) 307 if (i < len)
229 COMMA; 308 encode_comma (enc);
230 } 309 }
231 310
232 NL; 311 encode_nl (enc);
233 312
234 --enc->indent; 313 --enc->indent;
235 INDENT; encode_ch (enc, ']'); 314 encode_indent (enc); encode_ch (enc, ']');
236} 315}
237 316
238static void 317static void
239encode_he (enc_t *enc, HE *he) 318encode_he (enc_t *enc, HE *he)
240{ 319{
… …
254 else 333 else
255 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 334 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
256 335
257 encode_ch (enc, '"'); 336 encode_ch (enc, '"');
258 337
259 if (enc->flags & F_SPACE_BEFORE) SPACE; 338 if (enc->flags & F_SPACE_BEFORE) encode_space (enc);
260 encode_ch (enc, ':'); 339 encode_ch (enc, ':');
261 if (enc->flags & F_SPACE_AFTER ) SPACE; 340 if (enc->flags & F_SPACE_AFTER ) encode_space (enc);
262 encode_sv (enc, HeVAL (he)); 341 encode_sv (enc, HeVAL (he));
263} 342}
264 343
265// compare hash entries, used when all keys are bytestrings 344// compare hash entries, used when all keys are bytestrings
266static int 345static int
… …
272 HE *b = *(HE **)b_; 351 HE *b = *(HE **)b_;
273 352
274 STRLEN la = HeKLEN (a); 353 STRLEN la = HeKLEN (a);
275 STRLEN lb = HeKLEN (b); 354 STRLEN lb = HeKLEN (b);
276 355
277 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 356 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
278 cmp = la < lb ? -1 : la == lb ? 0 : 1; 357 cmp = la - lb;
279 358
280 return cmp; 359 return cmp;
281} 360}
282 361
283// compare hash entries, used when some keys are sv's or utf-x 362// compare hash entries, used when some keys are sv's or utf-x
… …
290static void 369static void
291encode_hv (enc_t *enc, HV *hv) 370encode_hv (enc_t *enc, HV *hv)
292{ 371{
293 int count, i; 372 int count, i;
294 373
374 if (enc->indent >= enc->maxdepth)
375 croak ("data structure too deep (hit recursion limit)");
376
295 encode_ch (enc, '{'); NL; ++enc->indent; 377 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
296 378
297 if ((count = hv_iterinit (hv))) 379 if ((count = hv_iterinit (hv)))
298 { 380 {
299 // for canonical output we have to sort by keys first 381 // for canonical output we have to sort by keys first
300 // actually, this is mostly due to the stupid so-called 382 // actually, this is mostly due to the stupid so-called
301 // security workaround added somewhere in 5.8.x. 383 // security workaround added somewhere in 5.8.x.
302 // that randomises hash orderings 384 // that randomises hash orderings
303 if (enc->flags & F_CANONICAL) 385 if (enc->flags & F_CANONICAL)
304 { 386 {
305 HE *he, *hes [count];
306 int fast = 1; 387 int fast = 1;
388 HE *he;
389#if defined(__BORLANDC__) || defined(_MSC_VER)
390 HE **hes = _alloca (count * sizeof (HE));
391#else
392 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
393#endif
307 394
308 i = 0; 395 i = 0;
309 while ((he = hv_iternext (hv))) 396 while ((he = hv_iternext (hv)))
310 { 397 {
311 hes [i++] = he; 398 hes [i++] = he;
… …
335 LEAVE; 422 LEAVE;
336 } 423 }
337 424
338 for (i = 0; i < count; ++i) 425 for (i = 0; i < count; ++i)
339 { 426 {
340 INDENT; 427 encode_indent (enc);
341 encode_he (enc, hes [i]); 428 encode_he (enc, hes [i]);
342 429
343 if (i < count - 1) 430 if (i < count - 1)
344 COMMA; 431 encode_comma (enc);
345 } 432 }
346 433
347 NL; 434 encode_nl (enc);
348 } 435 }
349 else 436 else
350 { 437 {
351 SV *sv;
352 HE *he = hv_iternext (hv); 438 HE *he = hv_iternext (hv);
353 439
354 for (;;) 440 for (;;)
355 { 441 {
356 INDENT; 442 encode_indent (enc);
357 encode_he (enc, he); 443 encode_he (enc, he);
358 444
359 if (!(he = hv_iternext (hv))) 445 if (!(he = hv_iternext (hv)))
360 break; 446 break;
361 447
362 COMMA; 448 encode_comma (enc);
363 } 449 }
364 450
365 NL; 451 encode_nl (enc);
366 } 452 }
367 } 453 }
368 454
369 --enc->indent; INDENT; encode_ch (enc, '}'); 455 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
456}
457
458// encode objects, arrays and special \0=false and \1=true values.
459static void
460encode_rv (enc_t *enc, SV *sv)
461{
462 svtype svt;
463
464 SvGETMAGIC (sv);
465 svt = SvTYPE (sv);
466
467 if (svt == SVt_PVHV)
468 encode_hv (enc, (HV *)sv);
469 else if (svt == SVt_PVAV)
470 encode_av (enc, (AV *)sv);
471 else if (svt < SVt_PVAV)
472 {
473 if (SvNIOK (sv) && SvIV (sv) == 0)
474 encode_str (enc, "false", 5, 0);
475 else if (SvNIOK (sv) && SvIV (sv) == 1)
476 encode_str (enc, "true", 4, 0);
477 else
478 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
479 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
480 }
481 else
482 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
483 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
370} 484}
371 485
372static void 486static void
373encode_sv (enc_t *enc, SV *sv) 487encode_sv (enc_t *enc, SV *sv)
374{ 488{
… …
382 encode_str (enc, str, len, SvUTF8 (sv)); 496 encode_str (enc, str, len, SvUTF8 (sv));
383 encode_ch (enc, '"'); 497 encode_ch (enc, '"');
384 } 498 }
385 else if (SvNOKp (sv)) 499 else if (SvNOKp (sv))
386 { 500 {
501 // trust that perl will do the right thing w.r.t. JSON syntax.
387 need (enc, NV_DIG + 32); 502 need (enc, NV_DIG + 32);
388 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 503 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
389 enc->cur += strlen (enc->cur); 504 enc->cur += strlen (enc->cur);
390 } 505 }
391 else if (SvIOKp (sv)) 506 else if (SvIOKp (sv))
392 { 507 {
393 need (enc, 64); 508 // we assume we can always read an IV as a UV
509 if (SvUV (sv) & ~(UV)0x7fff)
510 {
511 // large integer, use the (rather slow) snprintf way.
512 need (enc, sizeof (UV) * 3);
394 enc->cur += 513 enc->cur +=
395 SvIsUV(sv) 514 SvIsUV(sv)
396 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 515 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
397 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 516 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
517 }
518 else
519 {
520 // optimise the "small number case"
521 // code will likely be branchless and use only a single multiplication
522 I32 i = SvIV (sv);
523 U32 u;
524 char digit, nz = 0;
525
526 need (enc, 6);
527
528 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
529 u = i < 0 ? -i : i;
530
531 // convert to 4.28 fixed-point representation
532 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
533
534 // now output digit by digit, each time masking out the integer part
535 // and multiplying by 5 while moving the decimal point one to the right,
536 // resulting in a net multiplication by 10.
537 // we always write the digit to memory but conditionally increment
538 // the pointer, to ease the usage of conditional move instructions.
539 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
540 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
541 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
542 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
543 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
544 }
398 } 545 }
399 else if (SvROK (sv)) 546 else if (SvROK (sv))
400 { 547 encode_rv (enc, SvRV (sv));
401 if (!--enc->max_recurse)
402 croak ("data structure too deep (hit recursion limit)");
403
404 sv = SvRV (sv);
405
406 switch (SvTYPE (sv))
407 {
408 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
409 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
410
411 default:
412 croak ("JSON can only represent references to arrays or hashes");
413 }
414 }
415 else if (!SvOK (sv)) 548 else if (!SvOK (sv))
416 encode_str (enc, "null", 4, 0); 549 encode_str (enc, "null", 4, 0);
417 else 550 else
418 croak ("encountered perl type that JSON cannot handle"); 551 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
552 SvPV_nolen (sv), SvFLAGS (sv));
419} 553}
420 554
421static SV * 555static SV *
422encode_json (SV *scalar, UV flags) 556encode_json (SV *scalar, U32 flags)
423{ 557{
558 enc_t enc;
559
424 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar)) 560 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
425 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)"); 561 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
426 562
427 enc_t enc;
428 enc.flags = flags; 563 enc.flags = flags;
429 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 564 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
430 enc.cur = SvPVX (enc.sv); 565 enc.cur = SvPVX (enc.sv);
431 enc.end = SvEND (enc.sv); 566 enc.end = SvEND (enc.sv);
432 enc.max_recurse = 0;
433 enc.indent = 0; 567 enc.indent = 0;
568 enc.maxdepth = DEC_DEPTH (flags);
434 569
435 SvPOK_only (enc.sv); 570 SvPOK_only (enc.sv);
436 encode_sv (&enc, scalar); 571 encode_sv (&enc, scalar);
437 572
573 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
574 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
575
438 if (!(flags & (F_ASCII | F_UTF8))) 576 if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))
439 SvUTF8_on (enc.sv); 577 SvUTF8_on (enc.sv);
440
441 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
442 578
443 if (enc.flags & F_SHRINK) 579 if (enc.flags & F_SHRINK)
444 shrink (enc.sv); 580 shrink (enc.sv);
445 581
446 return enc.sv; 582 return enc.sv;
447} 583}
448 584
449///////////////////////////////////////////////////////////////////////////// 585/////////////////////////////////////////////////////////////////////////////
586// decoder
450 587
451#define WS \ 588// structure used for decoding JSON
589typedef struct
590{
591 char *cur; // current parser pointer
592 char *end; // end of input string
593 const char *err; // parse error, if != 0
594 U32 flags; // F_*
595 U32 depth; // recursion depth
596 U32 maxdepth; // recursion depth limit
597} dec_t;
598
599inline void
600decode_ws (dec_t *dec)
601{
452 for (;;) \ 602 for (;;)
453 { \ 603 {
454 char ch = *dec->cur; \ 604 char ch = *dec->cur;
605
455 if (ch > 0x20 \ 606 if (ch > 0x20
456 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 607 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
457 break; \ 608 break;
609
458 ++dec->cur; \ 610 ++dec->cur;
459 } 611 }
612}
460 613
461#define ERR(reason) SB dec->err = reason; goto fail; SE 614#define ERR(reason) SB dec->err = reason; goto fail; SE
615
462#define EXPECT_CH(ch) SB \ 616#define EXPECT_CH(ch) SB \
463 if (*dec->cur != ch) \ 617 if (*dec->cur != ch) \
464 ERR (# ch " expected"); \ 618 ERR (# ch " expected"); \
465 ++dec->cur; \ 619 ++dec->cur; \
466 SE 620 SE
467 621
622#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
623#define DEC_DEC_DEPTH --dec->depth
624
468static SV *decode_sv (dec_t *dec); 625static SV *decode_sv (dec_t *dec);
469 626
470static signed char decode_hexdigit[256]; 627static signed char decode_hexdigit[256];
471 628
472static UV 629static UV
473decode_4hex (dec_t *dec) 630decode_4hex (dec_t *dec)
474{ 631{
475 signed char d1, d2, d3, d4; 632 signed char d1, d2, d3, d4;
633 unsigned char *cur = (unsigned char *)dec->cur;
476 634
477 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 635 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
478 if (d1 < 0) ERR ("four hexadecimal digits expected"); 636 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
479 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 637 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
480 if (d2 < 0) ERR ("four hexadecimal digits expected"); 638 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
481 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
482 if (d3 < 0) ERR ("four hexadecimal digits expected");
483 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
484 if (d4 < 0) ERR ("four hexadecimal digits expected");
485 639
486 dec->cur += 4; 640 dec->cur += 4;
487 641
488 return ((UV)d1) << 12 642 return ((UV)d1) << 12
489 | ((UV)d2) << 8 643 | ((UV)d2) << 8
… …
492 646
493fail: 647fail:
494 return (UV)-1; 648 return (UV)-1;
495} 649}
496 650
497#define APPEND_GROW(n) SB \
498 if (cur + (n) >= end) \
499 { \
500 STRLEN ofs = cur - SvPVX (sv); \
501 SvGROW (sv, ofs + (n) + 1); \
502 cur = SvPVX (sv) + ofs; \
503 end = SvEND (sv); \
504 } \
505 SE
506
507#define APPEND_CH(ch) SB \
508 APPEND_GROW (1); \
509 *cur++ = (ch); \
510 SE
511
512static SV * 651static SV *
513decode_str (dec_t *dec) 652decode_str (dec_t *dec)
514{ 653{
515 SV *sv = NEWSV (0,2); 654 SV *sv = 0;
516 int utf8 = 0; 655 int utf8 = 0;
517 char *cur = SvPVX (sv); 656 char *dec_cur = dec->cur;
518 char *end = SvEND (sv);
519 657
520 for (;;) 658 do
521 { 659 {
522 unsigned char ch = *(unsigned char *)dec->cur; 660 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
661 char *cur = buf;
523 662
524 if (ch == '"') 663 do
525 break;
526 else if (ch == '\\')
527 { 664 {
528 switch (*++dec->cur) 665 unsigned char ch = *(unsigned char *)dec_cur++;
666
667 if (expect_false (ch == '"'))
529 { 668 {
530 case '\\': 669 --dec_cur;
531 case '/': 670 break;
532 case '"': APPEND_CH (*dec->cur++); break; 671 }
533 672 else if (expect_false (ch == '\\'))
534 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 673 {
535 case 't': APPEND_CH ('\011'); ++dec->cur; break; 674 switch (*dec_cur)
536 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
537 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
538 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
539
540 case 'u':
541 { 675 {
542 UV lo, hi; 676 case '\\':
543 ++dec->cur; 677 case '/':
678 case '"': *cur++ = *dec_cur++; break;
544 679
545 hi = decode_4hex (dec); 680 case 'b': ++dec_cur; *cur++ = '\010'; break;
546 if (hi == (UV)-1) 681 case 't': ++dec_cur; *cur++ = '\011'; break;
547 goto fail; 682 case 'n': ++dec_cur; *cur++ = '\012'; break;
683 case 'f': ++dec_cur; *cur++ = '\014'; break;
684 case 'r': ++dec_cur; *cur++ = '\015'; break;
548 685
549 // possibly a surrogate pair 686 case 'u':
550 if (hi >= 0xd800 && hi < 0xdc00)
551 { 687 {
552 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 688 UV lo, hi;
553 ERR ("missing low surrogate character in surrogate pair"); 689 ++dec_cur;
554 690
555 dec->cur += 2; 691 dec->cur = dec_cur;
556
557 lo = decode_4hex (dec); 692 hi = decode_4hex (dec);
693 dec_cur = dec->cur;
558 if (lo == (UV)-1) 694 if (hi == (UV)-1)
559 goto fail; 695 goto fail;
560 696
697 // possibly a surrogate pair
698 if (hi >= 0xd800)
699 if (hi < 0xdc00)
700 {
701 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
702 ERR ("missing low surrogate character in surrogate pair");
703
704 dec_cur += 2;
705
706 dec->cur = dec_cur;
707 lo = decode_4hex (dec);
708 dec_cur = dec->cur;
709 if (lo == (UV)-1)
710 goto fail;
711
561 if (lo < 0xdc00 || lo >= 0xe000) 712 if (lo < 0xdc00 || lo >= 0xe000)
562 ERR ("surrogate pair expected"); 713 ERR ("surrogate pair expected");
563 714
564 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 715 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
716 }
717 else if (hi < 0xe000)
718 ERR ("missing high surrogate character in surrogate pair");
719
720 if (hi >= 0x80)
721 {
722 utf8 = 1;
723
724 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
725 }
726 else
727 *cur++ = hi;
565 } 728 }
566 else if (hi >= 0xdc00 && hi < 0xe000)
567 ERR ("missing high surrogate character in surrogate pair");
568
569 if (hi >= 0x80)
570 { 729 break;
571 utf8 = 1;
572 730
573 APPEND_GROW (4); // at most 4 bytes for 21 bits
574 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
575 }
576 else 731 default:
577 APPEND_CH (hi); 732 --dec_cur;
733 ERR ("illegal backslash escape sequence in string");
578 } 734 }
579 break; 735 }
736 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
737 *cur++ = ch;
738 else if (ch >= 0x80)
739 {
740 STRLEN clen;
741 UV uch;
580 742
581 default:
582 --dec->cur; 743 --dec_cur;
583 ERR ("illegal backslash escape sequence in string"); 744
745 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
746 if (clen == (STRLEN)-1)
747 ERR ("malformed UTF-8 character in JSON string");
748
749 do
750 *cur++ = *dec_cur++;
751 while (--clen);
752
753 utf8 = 1;
754 }
755 else
756 {
757 --dec_cur;
758
759 if (!ch)
760 ERR ("unexpected end of string while parsing JSON string");
761 else
762 ERR ("invalid character encountered while parsing JSON string");
584 } 763 }
585 } 764 }
586 else if (ch >= 0x20 && ch <= 0x7f) 765 while (cur < buf + SHORT_STRING_LEN);
587 APPEND_CH (*dec->cur++); 766
588 else if (ch >= 0x80)
589 { 767 {
590 STRLEN clen; 768 STRLEN len = cur - buf;
591 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
592 if (clen == (STRLEN)-1)
593 ERR ("malformed UTF-8 character in JSON string");
594 769
595 APPEND_GROW (clen); 770 if (sv)
596 do
597 { 771 {
598 *cur++ = *dec->cur++; 772 SvGROW (sv, SvCUR (sv) + len + 1);
773 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
774 SvCUR_set (sv, SvCUR (sv) + len);
599 } 775 }
600 while (--clen);
601
602 utf8 = 1;
603 }
604 else if (dec->cur == dec->end)
605 ERR ("unexpected end of string while parsing json string");
606 else 776 else
607 ERR ("invalid character encountered"); 777 sv = newSVpvn (buf, len);
608 } 778 }
779 }
780 while (*dec_cur != '"');
609 781
610 ++dec->cur; 782 ++dec_cur;
611 783
612 SvCUR_set (sv, cur - SvPVX (sv)); 784 if (sv)
613 785 {
614 SvPOK_only (sv); 786 SvPOK_only (sv);
615 *SvEND (sv) = 0; 787 *SvEND (sv) = 0;
616 788
617 if (utf8) 789 if (utf8)
618 SvUTF8_on (sv); 790 SvUTF8_on (sv);
791 }
792 else
793 sv = newSVpvn ("", 0);
619 794
620 if (dec->flags & F_SHRINK) 795 dec->cur = dec_cur;
621 shrink (sv);
622
623 return sv; 796 return sv;
624 797
625fail: 798fail:
626 SvREFCNT_dec (sv); 799 dec->cur = dec_cur;
627 return 0; 800 return 0;
628} 801}
629 802
630static SV * 803static SV *
631decode_num (dec_t *dec) 804decode_num (dec_t *dec)
… …
689 is_nv = 1; 862 is_nv = 1;
690 } 863 }
691 864
692 if (!is_nv) 865 if (!is_nv)
693 { 866 {
694 UV uv; 867 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
695 int numtype = grok_number (start, dec->cur - start, &uv); 868 if (*start == '-')
696 if (numtype & IS_NUMBER_IN_UV) 869 switch (dec->cur - start)
697 if (numtype & IS_NUMBER_NEG)
698 { 870 {
699 if (uv < (UV)IV_MIN) 871 case 2: return newSViv (-( start [1] - '0' * 1));
700 return newSViv (-(IV)uv); 872 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
873 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
874 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
701 } 875 }
876 else
877 switch (dec->cur - start)
878 {
879 case 1: return newSViv ( start [0] - '0' * 1);
880 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
881 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
882 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
883 }
884
885 {
886 UV uv;
887 int numtype = grok_number (start, dec->cur - start, &uv);
888 if (numtype & IS_NUMBER_IN_UV)
889 if (numtype & IS_NUMBER_NEG)
890 {
891 if (uv < (UV)IV_MIN)
892 return newSViv (-(IV)uv);
893 }
702 else 894 else
703 return newSVuv (uv); 895 return newSVuv (uv);
896
897 // here would likely be the place for bigint support
704 } 898 }
899 }
705 900
901 // if we ever support bigint or bigfloat, this is the place for bigfloat
706 return newSVnv (Atof (start)); 902 return newSVnv (Atof (start));
707 903
708fail: 904fail:
709 return 0; 905 return 0;
710} 906}
… …
712static SV * 908static SV *
713decode_av (dec_t *dec) 909decode_av (dec_t *dec)
714{ 910{
715 AV *av = newAV (); 911 AV *av = newAV ();
716 912
717 WS; 913 DEC_INC_DEPTH;
914 decode_ws (dec);
915
718 if (*dec->cur == ']') 916 if (*dec->cur == ']')
719 ++dec->cur; 917 ++dec->cur;
720 else 918 else
721 for (;;) 919 for (;;)
722 { 920 {
… …
726 if (!value) 924 if (!value)
727 goto fail; 925 goto fail;
728 926
729 av_push (av, value); 927 av_push (av, value);
730 928
731 WS; 929 decode_ws (dec);
732 930
733 if (*dec->cur == ']') 931 if (*dec->cur == ']')
734 { 932 {
735 ++dec->cur; 933 ++dec->cur;
736 break; 934 break;
… …
740 ERR (", or ] expected while parsing array"); 938 ERR (", or ] expected while parsing array");
741 939
742 ++dec->cur; 940 ++dec->cur;
743 } 941 }
744 942
943 DEC_DEC_DEPTH;
745 return newRV_noinc ((SV *)av); 944 return newRV_noinc ((SV *)av);
746 945
747fail: 946fail:
748 SvREFCNT_dec (av); 947 SvREFCNT_dec (av);
948 DEC_DEC_DEPTH;
749 return 0; 949 return 0;
750} 950}
751 951
752static SV * 952static SV *
753decode_hv (dec_t *dec) 953decode_hv (dec_t *dec)
754{ 954{
755 HV *hv = newHV (); 955 HV *hv = newHV ();
756 956
757 WS; 957 DEC_INC_DEPTH;
958 decode_ws (dec);
959
758 if (*dec->cur == '}') 960 if (*dec->cur == '}')
759 ++dec->cur; 961 ++dec->cur;
760 else 962 else
761 for (;;) 963 for (;;)
762 { 964 {
763 SV *key, *value; 965 SV *key, *value;
764 966
765 WS; EXPECT_CH ('"'); 967 decode_ws (dec); EXPECT_CH ('"');
766 968
767 key = decode_str (dec); 969 key = decode_str (dec);
768 if (!key) 970 if (!key)
769 goto fail; 971 goto fail;
770 972
771 WS; EXPECT_CH (':'); 973 decode_ws (dec); EXPECT_CH (':');
772 974
773 value = decode_sv (dec); 975 value = decode_sv (dec);
774 if (!value) 976 if (!value)
775 { 977 {
776 SvREFCNT_dec (key); 978 SvREFCNT_dec (key);
777 goto fail; 979 goto fail;
778 } 980 }
779 981
780 //TODO: optimise
781 hv_store_ent (hv, key, value, 0); 982 hv_store_ent (hv, key, value, 0);
983 SvREFCNT_dec (key);
782 984
783 WS; 985 decode_ws (dec);
784 986
785 if (*dec->cur == '}') 987 if (*dec->cur == '}')
786 { 988 {
787 ++dec->cur; 989 ++dec->cur;
788 break; 990 break;
… …
792 ERR (", or } expected while parsing object/hash"); 994 ERR (", or } expected while parsing object/hash");
793 995
794 ++dec->cur; 996 ++dec->cur;
795 } 997 }
796 998
999 DEC_DEC_DEPTH;
797 return newRV_noinc ((SV *)hv); 1000 return newRV_noinc ((SV *)hv);
798 1001
799fail: 1002fail:
800 SvREFCNT_dec (hv); 1003 SvREFCNT_dec (hv);
1004 DEC_DEC_DEPTH;
801 return 0; 1005 return 0;
802} 1006}
803 1007
804static SV * 1008static SV *
805decode_sv (dec_t *dec) 1009decode_sv (dec_t *dec)
806{ 1010{
807 WS; 1011 decode_ws (dec);
1012
1013 // the beauty of JSON: you need exactly one character lookahead
1014 // to parse anything.
808 switch (*dec->cur) 1015 switch (*dec->cur)
809 { 1016 {
810 case '"': ++dec->cur; return decode_str (dec); 1017 case '"': ++dec->cur; return decode_str (dec);
811 case '[': ++dec->cur; return decode_av (dec); 1018 case '[': ++dec->cur; return decode_av (dec);
812 case '{': ++dec->cur; return decode_hv (dec); 1019 case '{': ++dec->cur; return decode_hv (dec);
… …
848 ERR ("'null' expected"); 1055 ERR ("'null' expected");
849 1056
850 break; 1057 break;
851 1058
852 default: 1059 default:
853 ERR ("malformed json string, neither array, object, number, string or atom"); 1060 ERR ("malformed JSON string, neither array, object, number, string or atom");
854 break; 1061 break;
855 } 1062 }
856 1063
857fail: 1064fail:
858 return 0; 1065 return 0;
859} 1066}
860 1067
861static SV * 1068static SV *
862decode_json (SV *string, UV flags) 1069decode_json (SV *string, U32 flags, UV *offset_return)
863{ 1070{
1071 dec_t dec;
1072 UV offset;
864 SV *sv; 1073 SV *sv;
1074
1075 SvGETMAGIC (string);
1076 SvUPGRADE (string, SVt_PV);
865 1077
866 if (flags & F_UTF8) 1078 if (flags & F_UTF8)
867 sv_utf8_downgrade (string, 0); 1079 sv_utf8_downgrade (string, 0);
868 else 1080 else
869 sv_utf8_upgrade (string); 1081 sv_utf8_upgrade (string);
870 1082
871 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1083 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
872 1084
873 dec_t dec;
874 dec.flags = flags; 1085 dec.flags = flags;
875 dec.cur = SvPVX (string); 1086 dec.cur = SvPVX (string);
876 dec.end = SvEND (string); 1087 dec.end = SvEND (string);
877 dec.err = 0; 1088 dec.err = 0;
1089 dec.depth = 0;
1090 dec.maxdepth = DEC_DEPTH (dec.flags);
878 1091
1092 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
879 sv = decode_sv (&dec); 1093 sv = decode_sv (&dec);
880 1094
1095 if (!(offset_return || !sv))
1096 {
1097 // check for trailing garbage
1098 decode_ws (&dec);
1099
1100 if (*dec.cur)
1101 {
1102 dec.err = "garbage after JSON object";
1103 SvREFCNT_dec (sv);
1104 sv = 0;
1105 }
1106 }
1107
1108 if (offset_return || !sv)
1109 {
1110 offset = dec.flags & F_UTF8
1111 ? dec.cur - SvPVX (string)
1112 : utf8_distance (dec.cur, SvPVX (string));
1113
1114 if (offset_return)
1115 *offset_return = offset;
1116 }
1117
881 if (!sv) 1118 if (!sv)
882 { 1119 {
883 IV offset = dec.flags & F_UTF8
884 ? dec.cur - SvPVX (string)
885 : utf8_distance (dec.cur, SvPVX (string));
886 SV *uni = sv_newmortal (); 1120 SV *uni = sv_newmortal ();
887 1121
888 // horrible hack to silence warning inside pv_uni_display 1122 // horrible hack to silence warning inside pv_uni_display
889 COP cop = *PL_curcop; 1123 COP cop = *PL_curcop;
890 cop.cop_warnings = pWARN_NONE; 1124 cop.cop_warnings = pWARN_NONE;
… …
892 SAVEVPTR (PL_curcop); 1126 SAVEVPTR (PL_curcop);
893 PL_curcop = &cop; 1127 PL_curcop = &cop;
894 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1128 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
895 LEAVE; 1129 LEAVE;
896 1130
897 croak ("%s, at character offset %d (%s)", 1131 croak ("%s, at character offset %d [\"%s\"]",
898 dec.err, 1132 dec.err,
899 (int)offset, 1133 (int)offset,
900 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1134 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
901 } 1135 }
902 1136
903 sv = sv_2mortal (sv); 1137 sv = sv_2mortal (sv);
904 1138
905 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1139 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))
906 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1140 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
907 1141
908 return sv; 1142 return sv;
909} 1143}
910 1144
1145/////////////////////////////////////////////////////////////////////////////
1146// XS interface functions
1147
911MODULE = JSON::XS PACKAGE = JSON::XS 1148MODULE = JSON::XS PACKAGE = JSON::XS
912 1149
913BOOT: 1150BOOT:
914{ 1151{
915 int i; 1152 int i;
916 1153
917 memset (decode_hexdigit, 0xff, 256);
918 for (i = 10; i--; ) 1154 for (i = 0; i < 256; ++i)
919 decode_hexdigit ['0' + i] = i; 1155 decode_hexdigit [i] =
920 1156 i >= '0' && i <= '9' ? i - '0'
921 for (i = 7; i--; ) 1157 : i >= 'a' && i <= 'f' ? i - 'a' + 10
922 { 1158 : i >= 'A' && i <= 'F' ? i - 'A' + 10
923 decode_hexdigit ['a' + i] = 10 + i; 1159 : -1;
924 decode_hexdigit ['A' + i] = 10 + i;
925 }
926 1160
927 json_stash = gv_stashpv ("JSON::XS", 1); 1161 json_stash = gv_stashpv ("JSON::XS", 1);
928} 1162}
929 1163
930PROTOTYPES: DISABLE 1164PROTOTYPES: DISABLE
… …
936 RETVAL 1170 RETVAL
937 1171
938SV *ascii (SV *self, int enable = 1) 1172SV *ascii (SV *self, int enable = 1)
939 ALIAS: 1173 ALIAS:
940 ascii = F_ASCII 1174 ascii = F_ASCII
1175 latin1 = F_LATIN1
941 utf8 = F_UTF8 1176 utf8 = F_UTF8
942 indent = F_INDENT 1177 indent = F_INDENT
943 canonical = F_CANONICAL 1178 canonical = F_CANONICAL
944 space_before = F_SPACE_BEFORE 1179 space_before = F_SPACE_BEFORE
945 space_after = F_SPACE_AFTER 1180 space_after = F_SPACE_AFTER
946 json_rpc = F_JSON_RPC
947 pretty = F_PRETTY 1181 pretty = F_PRETTY
948 allow_nonref = F_ALLOW_NONREF 1182 allow_nonref = F_ALLOW_NONREF
949 shrink = F_SHRINK 1183 shrink = F_SHRINK
950 CODE: 1184 CODE:
951{ 1185{
… …
958 RETVAL = newSVsv (self); 1192 RETVAL = newSVsv (self);
959} 1193}
960 OUTPUT: 1194 OUTPUT:
961 RETVAL 1195 RETVAL
962 1196
1197SV *max_depth (SV *self, UV max_depth = 0x80000000UL)
1198 CODE:
1199{
1200 UV *uv = SvJSON (self);
1201 UV log2 = 0;
1202
1203 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1204
1205 while ((1UL << log2) < max_depth)
1206 ++log2;
1207
1208 *uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1209
1210 RETVAL = newSVsv (self);
1211}
1212 OUTPUT:
1213 RETVAL
1214
963void encode (SV *self, SV *scalar) 1215void encode (SV *self, SV *scalar)
964 PPCODE: 1216 PPCODE:
965 XPUSHs (encode_json (scalar, *SvJSON (self))); 1217 XPUSHs (encode_json (scalar, *SvJSON (self)));
966 1218
967void decode (SV *self, SV *jsonstr) 1219void decode (SV *self, SV *jsonstr)
968 PPCODE: 1220 PPCODE:
969 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1221 XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1222
1223void decode_prefix (SV *self, SV *jsonstr)
1224 PPCODE:
1225{
1226 UV offset;
1227 EXTEND (SP, 2);
1228 PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));
1229 PUSHs (sv_2mortal (newSVuv (offset)));
1230}
970 1231
971PROTOTYPES: ENABLE 1232PROTOTYPES: ENABLE
972 1233
973void to_json (SV *scalar) 1234void to_json (SV *scalar)
1235 ALIAS:
1236 objToJson = 0
974 PPCODE: 1237 PPCODE:
975 XPUSHs (encode_json (scalar, F_UTF8)); 1238 XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
976 1239
977void from_json (SV *jsonstr) 1240void from_json (SV *jsonstr)
1241 ALIAS:
1242 jsonToObj = 0
978 PPCODE: 1243 PPCODE:
979 XPUSHs (decode_json (jsonstr, F_UTF8)); 1244 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
980 1245

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