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Comparing JSON-XS/XS.xs (file contents):
Revision 1.7 by root, Fri Mar 23 15:57:18 2007 UTC vs.
Revision 1.43 by root, Sat Jun 23 23:49:29 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
14// some old perls do not have this, try to make it work, no
15// guarentees, though. if it breaks, you get to keep the pieces.
16#ifndef UTF8_MAXBYTES
17# define UTF8_MAXBYTES 13
18#endif
19
9#define F_ASCII 0x00000001 20#define F_ASCII 0x00000001UL
21#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 22#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 23#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 24#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 25#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 26#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040
16#define F_ALLOW_NONREF 0x00000080 27#define F_ALLOW_NONREF 0x00000100UL
17#define F_SHRINK 0x00000100 28#define F_SHRINK 0x00000200UL
29#define F_MAXDEPTH 0xf8000000UL
30#define S_MAXDEPTH 27
31
32#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
33
34// F_SELFCONVERT? <=> to_json/toJson
35// F_BLESSED? <=> { $__class__$ => }
18 36
19#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 37#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20#define F_DEFAULT 0 38#define F_DEFAULT (9UL << S_MAXDEPTH)
21 39
22#define INIT_SIZE 32 // initial scalar size to be allocated 40#define INIT_SIZE 32 // initial scalar size to be allocated
41#define INDENT_STEP 3 // spaces per indentation level
42
43#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23 44
24#define SB do { 45#define SB do {
25#define SE } while (0) 46#define SE } while (0)
26 47
48#if __GNUC__ >= 3
49# define expect(expr,value) __builtin_expect ((expr),(value))
50# define inline inline
51#else
52# define expect(expr,value) (expr)
53# define inline static
54#endif
55
56#define expect_false(expr) expect ((expr) != 0, 0)
57#define expect_true(expr) expect ((expr) != 0, 1)
58
27static HV *json_stash; 59static HV *json_stash; // JSON::XS::
60static SV *json_true, *json_false;
61
62/////////////////////////////////////////////////////////////////////////////
63// utility functions
64
65static UV *
66SvJSON (SV *sv)
67{
68 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
69 croak ("object is not of type JSON::XS");
70
71 return &SvUVX (SvRV (sv));
72}
73
74static void
75shrink (SV *sv)
76{
77 sv_utf8_downgrade (sv, 1);
78 if (SvLEN (sv) > SvCUR (sv) + 1)
79 {
80#ifdef SvPV_shrink_to_cur
81 SvPV_shrink_to_cur (sv);
82#elif defined (SvPV_renew)
83 SvPV_renew (sv, SvCUR (sv) + 1);
84#endif
85 }
86}
87
88// decode an utf-8 character and return it, or (UV)-1 in
89// case of an error.
90// we special-case "safe" characters from U+80 .. U+7FF,
91// but use the very good perl function to parse anything else.
92// note that we never call this function for a ascii codepoints
93inline UV
94decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
95{
96 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
97 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
98 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
99 {
100 *clen = 2;
101 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
102 }
103 else
104 {
105 *clen = (STRLEN)-1;
106 return (UV)-1;
107 }
108}
109
110/////////////////////////////////////////////////////////////////////////////
111// encoder
28 112
29// structure used for encoding JSON 113// structure used for encoding JSON
30typedef struct 114typedef struct
31{ 115{
32 char *cur; 116 char *cur; // SvPVX (sv) + current output position
33 STRLEN len; // SvLEN (sv)
34 char *end; // SvEND (sv) 117 char *end; // SvEND (sv)
35 SV *sv; 118 SV *sv; // result scalar
36 UV flags; 119 U32 flags; // F_*
37 int max_recurse; 120 U32 indent; // indentation level
38 int indent; 121 U32 maxdepth; // max. indentation/recursion level
39} enc_t; 122} enc_t;
40 123
41// structure used for decoding JSON 124inline 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) 125need (enc_t *enc, STRLEN len)
72{ 126{
73 if (enc->cur + len >= enc->end) 127 if (expect_false (enc->cur + len >= enc->end))
74 { 128 {
75 STRLEN cur = enc->cur - SvPVX (enc->sv); 129 STRLEN cur = enc->cur - SvPVX (enc->sv);
76 SvGROW (enc->sv, cur + len + 1); 130 SvGROW (enc->sv, cur + len + 1);
77 enc->cur = SvPVX (enc->sv) + cur; 131 enc->cur = SvPVX (enc->sv) + cur;
78 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 132 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79 } 133 }
80} 134}
81 135
82static void 136inline void
83encode_ch (enc_t *enc, char ch) 137encode_ch (enc_t *enc, char ch)
84{ 138{
85 need (enc, 1); 139 need (enc, 1);
86 *enc->cur++ = ch; 140 *enc->cur++ = ch;
87} 141}
… …
95 149
96 while (str < end) 150 while (str < end)
97 { 151 {
98 unsigned char ch = *(unsigned char *)str; 152 unsigned char ch = *(unsigned char *)str;
99 153
100 if (ch >= 0x20 && ch < 0x80) // most common case 154 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101 { 155 {
102 if (ch == '"') // but with slow exceptions 156 if (expect_false (ch == '"')) // but with slow exceptions
103 { 157 {
104 need (enc, len += 1); 158 need (enc, len += 1);
105 *enc->cur++ = '\\'; 159 *enc->cur++ = '\\';
106 *enc->cur++ = '"'; 160 *enc->cur++ = '"';
107 } 161 }
108 else if (ch == '\\') 162 else if (expect_false (ch == '\\'))
109 { 163 {
110 need (enc, len += 1); 164 need (enc, len += 1);
111 *enc->cur++ = '\\'; 165 *enc->cur++ = '\\';
112 *enc->cur++ = '\\'; 166 *enc->cur++ = '\\';
113 } 167 }
… …
131 STRLEN clen; 185 STRLEN clen;
132 UV uch; 186 UV uch;
133 187
134 if (is_utf8) 188 if (is_utf8)
135 { 189 {
136 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 190 uch = decode_utf8 (str, end - str, &clen);
137 if (clen == (STRLEN)-1) 191 if (clen == (STRLEN)-1)
138 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 192 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139 } 193 }
140 else 194 else
141 { 195 {
142 uch = ch; 196 uch = ch;
143 clen = 1; 197 clen = 1;
144 } 198 }
145 199
146 if (uch < 0x80 || enc->flags & F_ASCII) 200 if (uch > 0x10FFFFUL)
201 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
202
203 if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
147 { 204 {
148 if (uch > 0xFFFFUL) 205 if (uch > 0xFFFFUL)
149 { 206 {
150 need (enc, len += 11); 207 need (enc, len += 11);
151 sprintf (enc->cur, "\\u%04x\\u%04x", 208 sprintf (enc->cur, "\\u%04x\\u%04x",
152 (uch - 0x10000) / 0x400 + 0xD800, 209 (int)((uch - 0x10000) / 0x400 + 0xD800),
153 (uch - 0x10000) % 0x400 + 0xDC00); 210 (int)((uch - 0x10000) % 0x400 + 0xDC00));
154 enc->cur += 12; 211 enc->cur += 12;
155 } 212 }
156 else 213 else
157 { 214 {
158 static char hexdigit [16] = "0123456789abcdef"; 215 static char hexdigit [16] = "0123456789abcdef";
… …
165 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 222 *enc->cur++ = hexdigit [(uch >> 0) & 15];
166 } 223 }
167 224
168 str += clen; 225 str += clen;
169 } 226 }
227 else if (enc->flags & F_LATIN1)
228 {
229 *enc->cur++ = uch;
230 str += clen;
231 }
170 else if (is_utf8) 232 else if (is_utf8)
171 { 233 {
172 need (enc, len += clen); 234 need (enc, len += clen);
173 do 235 do
174 { 236 {
… …
176 } 238 }
177 while (--clen); 239 while (--clen);
178 } 240 }
179 else 241 else
180 { 242 {
181 need (enc, len += 10); // never more than 11 bytes needed 243 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
182 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 244 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
183 ++str; 245 ++str;
184 } 246 }
185 } 247 }
186 } 248 }
… …
188 250
189 --len; 251 --len;
190 } 252 }
191} 253}
192 254
193#define INDENT SB \ 255inline void
256encode_indent (enc_t *enc)
257{
194 if (enc->flags & F_INDENT) \ 258 if (enc->flags & F_INDENT)
195 { \ 259 {
196 int i_; \ 260 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
202 261
203#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 262 need (enc, spaces);
204#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 263 memset (enc->cur, ' ', spaces);
205#define COMMA SB \ 264 enc->cur += spaces;
265 }
266}
267
268inline void
269encode_space (enc_t *enc)
270{
271 need (enc, 1);
206 encode_ch (enc, ','); \ 272 encode_ch (enc, ' ');
273}
274
275inline void
276encode_nl (enc_t *enc)
277{
207 if (enc->flags & F_INDENT) \ 278 if (enc->flags & F_INDENT)
208 NL; \ 279 {
280 need (enc, 1);
281 encode_ch (enc, '\n');
282 }
283}
284
285inline void
286encode_comma (enc_t *enc)
287{
288 encode_ch (enc, ',');
289
290 if (enc->flags & F_INDENT)
291 encode_nl (enc);
209 else if (enc->flags & F_SPACE_AFTER) \ 292 else if (enc->flags & F_SPACE_AFTER)
210 SPACE; \ 293 encode_space (enc);
211 SE 294}
212 295
213static void encode_sv (enc_t *enc, SV *sv); 296static void encode_sv (enc_t *enc, SV *sv);
214 297
215static void 298static void
216encode_av (enc_t *enc, AV *av) 299encode_av (enc_t *enc, AV *av)
217{ 300{
218 int i, len = av_len (av); 301 int i, len = av_len (av);
219 302
220 encode_ch (enc, '['); NL; 303 if (enc->indent >= enc->maxdepth)
304 croak ("data structure too deep (hit recursion limit)");
305
306 encode_ch (enc, '['); encode_nl (enc);
221 ++enc->indent; 307 ++enc->indent;
222 308
223 for (i = 0; i <= len; ++i) 309 for (i = 0; i <= len; ++i)
224 { 310 {
225 INDENT; 311 encode_indent (enc);
226 encode_sv (enc, *av_fetch (av, i, 0)); 312 encode_sv (enc, *av_fetch (av, i, 0));
227 313
228 if (i < len) 314 if (i < len)
229 COMMA; 315 encode_comma (enc);
230 } 316 }
231 317
232 NL; 318 encode_nl (enc);
233 319
234 --enc->indent; 320 --enc->indent;
235 INDENT; encode_ch (enc, ']'); 321 encode_indent (enc); encode_ch (enc, ']');
236} 322}
237 323
238static void 324static void
239encode_he (enc_t *enc, HE *he) 325encode_he (enc_t *enc, HE *he)
240{ 326{
… …
254 else 340 else
255 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 341 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
256 342
257 encode_ch (enc, '"'); 343 encode_ch (enc, '"');
258 344
259 if (enc->flags & F_SPACE_BEFORE) SPACE; 345 if (enc->flags & F_SPACE_BEFORE) encode_space (enc);
260 encode_ch (enc, ':'); 346 encode_ch (enc, ':');
261 if (enc->flags & F_SPACE_AFTER ) SPACE; 347 if (enc->flags & F_SPACE_AFTER ) encode_space (enc);
262 encode_sv (enc, HeVAL (he)); 348 encode_sv (enc, HeVAL (he));
263} 349}
264 350
265// compare hash entries, used when all keys are bytestrings 351// compare hash entries, used when all keys are bytestrings
266static int 352static int
… …
272 HE *b = *(HE **)b_; 358 HE *b = *(HE **)b_;
273 359
274 STRLEN la = HeKLEN (a); 360 STRLEN la = HeKLEN (a);
275 STRLEN lb = HeKLEN (b); 361 STRLEN lb = HeKLEN (b);
276 362
277 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 363 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
278 cmp = la < lb ? -1 : la == lb ? 0 : 1; 364 cmp = la - lb;
279 365
280 return cmp; 366 return cmp;
281} 367}
282 368
283// compare hash entries, used when some keys are sv's or utf-x 369// compare hash entries, used when some keys are sv's or utf-x
… …
290static void 376static void
291encode_hv (enc_t *enc, HV *hv) 377encode_hv (enc_t *enc, HV *hv)
292{ 378{
293 int count, i; 379 int count, i;
294 380
381 if (enc->indent >= enc->maxdepth)
382 croak ("data structure too deep (hit recursion limit)");
383
295 encode_ch (enc, '{'); NL; ++enc->indent; 384 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
296 385
297 if ((count = hv_iterinit (hv))) 386 if ((count = hv_iterinit (hv)))
298 { 387 {
299 // for canonical output we have to sort by keys first 388 // for canonical output we have to sort by keys first
300 // actually, this is mostly due to the stupid so-called 389 // actually, this is mostly due to the stupid so-called
301 // security workaround added somewhere in 5.8.x. 390 // security workaround added somewhere in 5.8.x.
302 // that randomises hash orderings 391 // that randomises hash orderings
303 if (enc->flags & F_CANONICAL) 392 if (enc->flags & F_CANONICAL)
304 { 393 {
305 HE *he, *hes [count];
306 int fast = 1; 394 int fast = 1;
395 HE *he;
396#if defined(__BORLANDC__) || defined(_MSC_VER)
397 HE **hes = _alloca (count * sizeof (HE));
398#else
399 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
400#endif
307 401
308 i = 0; 402 i = 0;
309 while ((he = hv_iternext (hv))) 403 while ((he = hv_iternext (hv)))
310 { 404 {
311 hes [i++] = he; 405 hes [i++] = he;
… …
317 411
318 if (fast) 412 if (fast)
319 qsort (hes, count, sizeof (HE *), he_cmp_fast); 413 qsort (hes, count, sizeof (HE *), he_cmp_fast);
320 else 414 else
321 { 415 {
322 // hack to disable "use bytes" 416 // hack to forcefully disable "use bytes"
323 COP *oldcop = PL_curcop, cop; 417 COP cop = *PL_curcop;
324 cop.op_private = 0; 418 cop.op_private = 0;
419
420 ENTER;
421 SAVETMPS;
422
423 SAVEVPTR (PL_curcop);
325 PL_curcop = &cop; 424 PL_curcop = &cop;
326 425
327 SAVETMPS;
328 qsort (hes, count, sizeof (HE *), he_cmp_slow); 426 qsort (hes, count, sizeof (HE *), he_cmp_slow);
427
329 FREETMPS; 428 FREETMPS;
330 429 LEAVE;
331 PL_curcop = oldcop;
332 } 430 }
333 431
334 for (i = 0; i < count; ++i) 432 for (i = 0; i < count; ++i)
335 { 433 {
336 INDENT; 434 encode_indent (enc);
337 encode_he (enc, hes [i]); 435 encode_he (enc, hes [i]);
338 436
339 if (i < count - 1) 437 if (i < count - 1)
340 COMMA; 438 encode_comma (enc);
341 } 439 }
342 440
343 NL; 441 encode_nl (enc);
344 } 442 }
345 else 443 else
346 { 444 {
347 SV *sv;
348 HE *he = hv_iternext (hv); 445 HE *he = hv_iternext (hv);
349 446
350 for (;;) 447 for (;;)
351 { 448 {
352 INDENT; 449 encode_indent (enc);
353 encode_he (enc, he); 450 encode_he (enc, he);
354 451
355 if (!(he = hv_iternext (hv))) 452 if (!(he = hv_iternext (hv)))
356 break; 453 break;
357 454
358 COMMA; 455 encode_comma (enc);
359 } 456 }
360 457
361 NL; 458 encode_nl (enc);
362 } 459 }
363 } 460 }
364 461
365 --enc->indent; INDENT; encode_ch (enc, '}'); 462 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
463}
464
465// encode objects, arrays and special \0=false and \1=true values.
466static void
467encode_rv (enc_t *enc, SV *sv)
468{
469 svtype svt;
470
471 SvGETMAGIC (sv);
472 svt = SvTYPE (sv);
473
474 if (svt == SVt_PVHV)
475 encode_hv (enc, (HV *)sv);
476 else if (svt == SVt_PVAV)
477 encode_av (enc, (AV *)sv);
478 else if (svt < SVt_PVAV)
479 {
480 if (SvNIOK (sv) && SvIV (sv) == 0)
481 encode_str (enc, "false", 5, 0);
482 else if (SvNIOK (sv) && SvIV (sv) == 1)
483 encode_str (enc, "true", 4, 0);
484 else
485 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
486 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
487 }
488 else
489 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
490 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
366} 491}
367 492
368static void 493static void
369encode_sv (enc_t *enc, SV *sv) 494encode_sv (enc_t *enc, SV *sv)
370{ 495{
… …
378 encode_str (enc, str, len, SvUTF8 (sv)); 503 encode_str (enc, str, len, SvUTF8 (sv));
379 encode_ch (enc, '"'); 504 encode_ch (enc, '"');
380 } 505 }
381 else if (SvNOKp (sv)) 506 else if (SvNOKp (sv))
382 { 507 {
508 // trust that perl will do the right thing w.r.t. JSON syntax.
383 need (enc, NV_DIG + 32); 509 need (enc, NV_DIG + 32);
384 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 510 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
385 enc->cur += strlen (enc->cur); 511 enc->cur += strlen (enc->cur);
386 } 512 }
387 else if (SvIOKp (sv)) 513 else if (SvIOKp (sv))
388 { 514 {
389 need (enc, 64); 515 // we assume we can always read an IV as a UV
516 if (SvUV (sv) & ~(UV)0x7fff)
517 {
518 // large integer, use the (rather slow) snprintf way.
519 need (enc, sizeof (UV) * 3);
390 enc->cur += 520 enc->cur +=
391 SvIsUV(sv) 521 SvIsUV(sv)
392 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 522 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
393 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 523 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
524 }
525 else
526 {
527 // optimise the "small number case"
528 // code will likely be branchless and use only a single multiplication
529 I32 i = SvIV (sv);
530 U32 u;
531 char digit, nz = 0;
532
533 need (enc, 6);
534
535 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
536 u = i < 0 ? -i : i;
537
538 // convert to 4.28 fixed-point representation
539 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
540
541 // now output digit by digit, each time masking out the integer part
542 // and multiplying by 5 while moving the decimal point one to the right,
543 // resulting in a net multiplication by 10.
544 // we always write the digit to memory but conditionally increment
545 // the pointer, to ease the usage of conditional move instructions.
546 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
547 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
548 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
549 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
550 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
551 }
394 } 552 }
395 else if (SvROK (sv)) 553 else if (SvROK (sv))
396 { 554 encode_rv (enc, SvRV (sv));
397 if (!--enc->max_recurse)
398 croak ("data structure too deep (hit recursion limit)");
399
400 sv = SvRV (sv);
401
402 switch (SvTYPE (sv))
403 {
404 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
405 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
406
407 default:
408 croak ("JSON can only represent references to arrays or hashes");
409 }
410 }
411 else if (!SvOK (sv)) 555 else if (!SvOK (sv))
412 encode_str (enc, "null", 4, 0); 556 encode_str (enc, "null", 4, 0);
413 else 557 else
414 croak ("encountered perl type that JSON cannot handle"); 558 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
559 SvPV_nolen (sv), SvFLAGS (sv));
415} 560}
416 561
417static SV * 562static SV *
418encode_json (SV *scalar, UV flags) 563encode_json (SV *scalar, U32 flags)
419{ 564{
565 enc_t enc;
566
420 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar)) 567 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
421 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)"); 568 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
422 569
423 enc_t enc;
424 enc.flags = flags; 570 enc.flags = flags;
425 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 571 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
426 enc.cur = SvPVX (enc.sv); 572 enc.cur = SvPVX (enc.sv);
427 enc.end = SvEND (enc.sv); 573 enc.end = SvEND (enc.sv);
428 enc.max_recurse = 0;
429 enc.indent = 0; 574 enc.indent = 0;
575 enc.maxdepth = DEC_DEPTH (flags);
430 576
431 SvPOK_only (enc.sv); 577 SvPOK_only (enc.sv);
432 encode_sv (&enc, scalar); 578 encode_sv (&enc, scalar);
433 579
580 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
581 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
582
434 if (!(flags & (F_ASCII | F_UTF8))) 583 if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))
435 SvUTF8_on (enc.sv); 584 SvUTF8_on (enc.sv);
436
437 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
438 585
439 if (enc.flags & F_SHRINK) 586 if (enc.flags & F_SHRINK)
440 shrink (enc.sv); 587 shrink (enc.sv);
441 588
442 return enc.sv; 589 return enc.sv;
443} 590}
444 591
445///////////////////////////////////////////////////////////////////////////// 592/////////////////////////////////////////////////////////////////////////////
593// decoder
446 594
447#define WS \ 595// structure used for decoding JSON
596typedef struct
597{
598 char *cur; // current parser pointer
599 char *end; // end of input string
600 const char *err; // parse error, if != 0
601 U32 flags; // F_*
602 U32 depth; // recursion depth
603 U32 maxdepth; // recursion depth limit
604} dec_t;
605
606inline void
607decode_ws (dec_t *dec)
608{
448 for (;;) \ 609 for (;;)
449 { \ 610 {
450 char ch = *dec->cur; \ 611 char ch = *dec->cur;
612
451 if (ch > 0x20 \ 613 if (ch > 0x20
452 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 614 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
453 break; \ 615 break;
616
454 ++dec->cur; \ 617 ++dec->cur;
455 } 618 }
619}
456 620
457#define ERR(reason) SB dec->err = reason; goto fail; SE 621#define ERR(reason) SB dec->err = reason; goto fail; SE
622
458#define EXPECT_CH(ch) SB \ 623#define EXPECT_CH(ch) SB \
459 if (*dec->cur != ch) \ 624 if (*dec->cur != ch) \
460 ERR (# ch " expected"); \ 625 ERR (# ch " expected"); \
461 ++dec->cur; \ 626 ++dec->cur; \
462 SE 627 SE
463 628
629#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
630#define DEC_DEC_DEPTH --dec->depth
631
464static SV *decode_sv (dec_t *dec); 632static SV *decode_sv (dec_t *dec);
465 633
466static signed char decode_hexdigit[256]; 634static signed char decode_hexdigit[256];
467 635
468static UV 636static UV
469decode_4hex (dec_t *dec) 637decode_4hex (dec_t *dec)
470{ 638{
471 signed char d1, d2, d3, d4; 639 signed char d1, d2, d3, d4;
640 unsigned char *cur = (unsigned char *)dec->cur;
472 641
473 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 642 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
474 if (d1 < 0) ERR ("four hexadecimal digits expected"); 643 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
475 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 644 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
476 if (d2 < 0) ERR ("four hexadecimal digits expected"); 645 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
477 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
478 if (d3 < 0) ERR ("four hexadecimal digits expected");
479 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
480 if (d4 < 0) ERR ("four hexadecimal digits expected");
481 646
482 dec->cur += 4; 647 dec->cur += 4;
483 648
484 return ((UV)d1) << 12 649 return ((UV)d1) << 12
485 | ((UV)d2) << 8 650 | ((UV)d2) << 8
… …
488 653
489fail: 654fail:
490 return (UV)-1; 655 return (UV)-1;
491} 656}
492 657
493#define APPEND_GROW(n) SB \
494 if (cur + (n) >= end) \
495 { \
496 STRLEN ofs = cur - SvPVX (sv); \
497 SvGROW (sv, ofs + (n) + 1); \
498 cur = SvPVX (sv) + ofs; \
499 end = SvEND (sv); \
500 } \
501 SE
502
503#define APPEND_CH(ch) SB \
504 APPEND_GROW (1); \
505 *cur++ = (ch); \
506 SE
507
508static SV * 658static SV *
509decode_str (dec_t *dec) 659decode_str (dec_t *dec)
510{ 660{
511 SV *sv = NEWSV (0,2); 661 SV *sv = 0;
512 int utf8 = 0; 662 int utf8 = 0;
513 char *cur = SvPVX (sv); 663 char *dec_cur = dec->cur;
514 char *end = SvEND (sv);
515 664
516 for (;;) 665 do
517 { 666 {
518 unsigned char ch = *(unsigned char *)dec->cur; 667 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
668 char *cur = buf;
519 669
520 if (ch == '"') 670 do
521 break;
522 else if (ch == '\\')
523 { 671 {
524 switch (*++dec->cur) 672 unsigned char ch = *(unsigned char *)dec_cur++;
673
674 if (expect_false (ch == '"'))
525 { 675 {
526 case '\\': 676 --dec_cur;
527 case '/': 677 break;
528 case '"': APPEND_CH (*dec->cur++); break; 678 }
529 679 else if (expect_false (ch == '\\'))
530 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 680 {
531 case 't': APPEND_CH ('\011'); ++dec->cur; break; 681 switch (*dec_cur)
532 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
533 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
534 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
535
536 case 'u':
537 { 682 {
538 UV lo, hi; 683 case '\\':
539 ++dec->cur; 684 case '/':
685 case '"': *cur++ = *dec_cur++; break;
540 686
541 hi = decode_4hex (dec); 687 case 'b': ++dec_cur; *cur++ = '\010'; break;
542 if (hi == (UV)-1) 688 case 't': ++dec_cur; *cur++ = '\011'; break;
543 goto fail; 689 case 'n': ++dec_cur; *cur++ = '\012'; break;
690 case 'f': ++dec_cur; *cur++ = '\014'; break;
691 case 'r': ++dec_cur; *cur++ = '\015'; break;
544 692
545 // possibly a surrogate pair 693 case 'u':
546 if (hi >= 0xd800 && hi < 0xdc00)
547 { 694 {
548 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 695 UV lo, hi;
549 ERR ("missing low surrogate character in surrogate pair"); 696 ++dec_cur;
550 697
551 dec->cur += 2; 698 dec->cur = dec_cur;
552
553 lo = decode_4hex (dec); 699 hi = decode_4hex (dec);
700 dec_cur = dec->cur;
554 if (lo == (UV)-1) 701 if (hi == (UV)-1)
555 goto fail; 702 goto fail;
556 703
704 // possibly a surrogate pair
705 if (hi >= 0xd800)
706 if (hi < 0xdc00)
707 {
708 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
709 ERR ("missing low surrogate character in surrogate pair");
710
711 dec_cur += 2;
712
713 dec->cur = dec_cur;
714 lo = decode_4hex (dec);
715 dec_cur = dec->cur;
716 if (lo == (UV)-1)
717 goto fail;
718
557 if (lo < 0xdc00 || lo >= 0xe000) 719 if (lo < 0xdc00 || lo >= 0xe000)
558 ERR ("surrogate pair expected"); 720 ERR ("surrogate pair expected");
559 721
560 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 722 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
723 }
724 else if (hi < 0xe000)
725 ERR ("missing high surrogate character in surrogate pair");
726
727 if (hi >= 0x80)
728 {
729 utf8 = 1;
730
731 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
732 }
733 else
734 *cur++ = hi;
561 } 735 }
562 else if (hi >= 0xdc00 && hi < 0xe000)
563 ERR ("missing high surrogate character in surrogate pair");
564
565 if (hi >= 0x80)
566 { 736 break;
567 utf8 = 1;
568 737
569 APPEND_GROW (4); // at most 4 bytes for 21 bits
570 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
571 }
572 else 738 default:
573 APPEND_CH (hi); 739 --dec_cur;
740 ERR ("illegal backslash escape sequence in string");
574 } 741 }
575 break; 742 }
743 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
744 *cur++ = ch;
745 else if (ch >= 0x80)
746 {
747 STRLEN clen;
748 UV uch;
576 749
577 default:
578 --dec->cur; 750 --dec_cur;
579 ERR ("illegal backslash escape sequence in string"); 751
752 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
753 if (clen == (STRLEN)-1)
754 ERR ("malformed UTF-8 character in JSON string");
755
756 do
757 *cur++ = *dec_cur++;
758 while (--clen);
759
760 utf8 = 1;
761 }
762 else
763 {
764 --dec_cur;
765
766 if (!ch)
767 ERR ("unexpected end of string while parsing JSON string");
768 else
769 ERR ("invalid character encountered while parsing JSON string");
580 } 770 }
581 } 771 }
582 else if (ch >= 0x20 && ch <= 0x7f) 772 while (cur < buf + SHORT_STRING_LEN);
583 APPEND_CH (*dec->cur++); 773
584 else if (ch >= 0x80)
585 { 774 {
586 STRLEN clen; 775 STRLEN len = cur - buf;
587 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
588 if (clen == (STRLEN)-1)
589 ERR ("malformed UTF-8 character in JSON string");
590 776
591 APPEND_GROW (clen); 777 if (sv)
592 do
593 { 778 {
594 *cur++ = *dec->cur++; 779 SvGROW (sv, SvCUR (sv) + len + 1);
780 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
781 SvCUR_set (sv, SvCUR (sv) + len);
595 } 782 }
596 while (--clen);
597
598 utf8 = 1;
599 }
600 else if (dec->cur == dec->end)
601 ERR ("unexpected end of string while parsing json string");
602 else 783 else
603 ERR ("invalid character encountered"); 784 sv = newSVpvn (buf, len);
604 } 785 }
786 }
787 while (*dec_cur != '"');
605 788
606 ++dec->cur; 789 ++dec_cur;
607 790
608 SvCUR_set (sv, cur - SvPVX (sv)); 791 if (sv)
609 792 {
610 SvPOK_only (sv); 793 SvPOK_only (sv);
611 *SvEND (sv) = 0; 794 *SvEND (sv) = 0;
612 795
613 if (utf8) 796 if (utf8)
614 SvUTF8_on (sv); 797 SvUTF8_on (sv);
798 }
799 else
800 sv = newSVpvn ("", 0);
615 801
616 if (dec->flags & F_SHRINK) 802 dec->cur = dec_cur;
617 shrink (sv);
618
619 return sv; 803 return sv;
620 804
621fail: 805fail:
622 SvREFCNT_dec (sv); 806 dec->cur = dec_cur;
623 return 0; 807 return 0;
624} 808}
625 809
626static SV * 810static SV *
627decode_num (dec_t *dec) 811decode_num (dec_t *dec)
… …
685 is_nv = 1; 869 is_nv = 1;
686 } 870 }
687 871
688 if (!is_nv) 872 if (!is_nv)
689 { 873 {
690 UV uv; 874 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
691 int numtype = grok_number (start, dec->cur - start, &uv); 875 if (*start == '-')
692 if (numtype & IS_NUMBER_IN_UV) 876 switch (dec->cur - start)
693 if (numtype & IS_NUMBER_NEG)
694 { 877 {
695 if (uv < (UV)IV_MIN) 878 case 2: return newSViv (-( start [1] - '0' * 1));
696 return newSViv (-(IV)uv); 879 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
880 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
881 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
697 } 882 }
883 else
884 switch (dec->cur - start)
885 {
886 case 1: return newSViv ( start [0] - '0' * 1);
887 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
888 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
889 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
890 }
891
892 {
893 UV uv;
894 int numtype = grok_number (start, dec->cur - start, &uv);
895 if (numtype & IS_NUMBER_IN_UV)
896 if (numtype & IS_NUMBER_NEG)
897 {
898 if (uv < (UV)IV_MIN)
899 return newSViv (-(IV)uv);
900 }
698 else 901 else
699 return newSVuv (uv); 902 return newSVuv (uv);
903
904 // here would likely be the place for bigint support
700 } 905 }
906 }
701 907
908 // if we ever support bigint or bigfloat, this is the place for bigfloat
702 return newSVnv (Atof (start)); 909 return newSVnv (Atof (start));
703 910
704fail: 911fail:
705 return 0; 912 return 0;
706} 913}
… …
708static SV * 915static SV *
709decode_av (dec_t *dec) 916decode_av (dec_t *dec)
710{ 917{
711 AV *av = newAV (); 918 AV *av = newAV ();
712 919
713 WS; 920 DEC_INC_DEPTH;
921 decode_ws (dec);
922
714 if (*dec->cur == ']') 923 if (*dec->cur == ']')
715 ++dec->cur; 924 ++dec->cur;
716 else 925 else
717 for (;;) 926 for (;;)
718 { 927 {
… …
722 if (!value) 931 if (!value)
723 goto fail; 932 goto fail;
724 933
725 av_push (av, value); 934 av_push (av, value);
726 935
727 WS; 936 decode_ws (dec);
728 937
729 if (*dec->cur == ']') 938 if (*dec->cur == ']')
730 { 939 {
731 ++dec->cur; 940 ++dec->cur;
732 break; 941 break;
… …
736 ERR (", or ] expected while parsing array"); 945 ERR (", or ] expected while parsing array");
737 946
738 ++dec->cur; 947 ++dec->cur;
739 } 948 }
740 949
950 DEC_DEC_DEPTH;
741 return newRV_noinc ((SV *)av); 951 return newRV_noinc ((SV *)av);
742 952
743fail: 953fail:
744 SvREFCNT_dec (av); 954 SvREFCNT_dec (av);
955 DEC_DEC_DEPTH;
745 return 0; 956 return 0;
746} 957}
747 958
748static SV * 959static SV *
749decode_hv (dec_t *dec) 960decode_hv (dec_t *dec)
750{ 961{
751 HV *hv = newHV (); 962 HV *hv = newHV ();
752 963
753 WS; 964 DEC_INC_DEPTH;
965 decode_ws (dec);
966
754 if (*dec->cur == '}') 967 if (*dec->cur == '}')
755 ++dec->cur; 968 ++dec->cur;
756 else 969 else
757 for (;;) 970 for (;;)
758 { 971 {
759 SV *key, *value; 972 SV *key, *value;
760 973
761 WS; EXPECT_CH ('"'); 974 decode_ws (dec); EXPECT_CH ('"');
762 975
763 key = decode_str (dec); 976 key = decode_str (dec);
764 if (!key) 977 if (!key)
765 goto fail; 978 goto fail;
766 979
767 WS; EXPECT_CH (':'); 980 decode_ws (dec); EXPECT_CH (':');
768 981
769 value = decode_sv (dec); 982 value = decode_sv (dec);
770 if (!value) 983 if (!value)
771 { 984 {
772 SvREFCNT_dec (key); 985 SvREFCNT_dec (key);
773 goto fail; 986 goto fail;
774 } 987 }
775 988
776 //TODO: optimise
777 hv_store_ent (hv, key, value, 0); 989 hv_store_ent (hv, key, value, 0);
990 SvREFCNT_dec (key);
778 991
779 WS; 992 decode_ws (dec);
780 993
781 if (*dec->cur == '}') 994 if (*dec->cur == '}')
782 { 995 {
783 ++dec->cur; 996 ++dec->cur;
784 break; 997 break;
… …
788 ERR (", or } expected while parsing object/hash"); 1001 ERR (", or } expected while parsing object/hash");
789 1002
790 ++dec->cur; 1003 ++dec->cur;
791 } 1004 }
792 1005
1006 DEC_DEC_DEPTH;
793 return newRV_noinc ((SV *)hv); 1007 return newRV_noinc ((SV *)hv);
794 1008
795fail: 1009fail:
796 SvREFCNT_dec (hv); 1010 SvREFCNT_dec (hv);
1011 DEC_DEC_DEPTH;
797 return 0; 1012 return 0;
798} 1013}
799 1014
800static SV * 1015static SV *
801decode_sv (dec_t *dec) 1016decode_sv (dec_t *dec)
802{ 1017{
803 WS; 1018 decode_ws (dec);
1019
1020 // the beauty of JSON: you need exactly one character lookahead
1021 // to parse anything.
804 switch (*dec->cur) 1022 switch (*dec->cur)
805 { 1023 {
806 case '"': ++dec->cur; return decode_str (dec); 1024 case '"': ++dec->cur; return decode_str (dec);
807 case '[': ++dec->cur; return decode_av (dec); 1025 case '[': ++dec->cur; return decode_av (dec);
808 case '{': ++dec->cur; return decode_hv (dec); 1026 case '{': ++dec->cur; return decode_hv (dec);
… …
814 1032
815 case 't': 1033 case 't':
816 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1034 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
817 { 1035 {
818 dec->cur += 4; 1036 dec->cur += 4;
819 return newSViv (1); 1037 return SvREFCNT_inc (json_true);
820 } 1038 }
821 else 1039 else
822 ERR ("'true' expected"); 1040 ERR ("'true' expected");
823 1041
824 break; 1042 break;
825 1043
826 case 'f': 1044 case 'f':
827 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1045 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
828 { 1046 {
829 dec->cur += 5; 1047 dec->cur += 5;
830 return newSViv (0); 1048 return SvREFCNT_inc (json_false);
831 } 1049 }
832 else 1050 else
833 ERR ("'false' expected"); 1051 ERR ("'false' expected");
834 1052
835 break; 1053 break;
… …
844 ERR ("'null' expected"); 1062 ERR ("'null' expected");
845 1063
846 break; 1064 break;
847 1065
848 default: 1066 default:
849 ERR ("malformed json string, neither array, object, number, string or atom"); 1067 ERR ("malformed JSON string, neither array, object, number, string or atom");
850 break; 1068 break;
851 } 1069 }
852 1070
853fail: 1071fail:
854 return 0; 1072 return 0;
855} 1073}
856 1074
857static SV * 1075static SV *
858decode_json (SV *string, UV flags) 1076decode_json (SV *string, U32 flags, UV *offset_return)
859{ 1077{
1078 dec_t dec;
1079 UV offset;
860 SV *sv; 1080 SV *sv;
1081
1082 SvGETMAGIC (string);
1083 SvUPGRADE (string, SVt_PV);
861 1084
862 if (flags & F_UTF8) 1085 if (flags & F_UTF8)
863 sv_utf8_downgrade (string, 0); 1086 sv_utf8_downgrade (string, 0);
864 else 1087 else
865 sv_utf8_upgrade (string); 1088 sv_utf8_upgrade (string);
866 1089
867 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1090 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
868 1091
869 dec_t dec;
870 dec.flags = flags; 1092 dec.flags = flags;
871 dec.cur = SvPVX (string); 1093 dec.cur = SvPVX (string);
872 dec.end = SvEND (string); 1094 dec.end = SvEND (string);
873 dec.err = 0; 1095 dec.err = 0;
1096 dec.depth = 0;
1097 dec.maxdepth = DEC_DEPTH (dec.flags);
874 1098
1099 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
875 sv = decode_sv (&dec); 1100 sv = decode_sv (&dec);
876 1101
1102 if (!(offset_return || !sv))
1103 {
1104 // check for trailing garbage
1105 decode_ws (&dec);
1106
1107 if (*dec.cur)
1108 {
1109 dec.err = "garbage after JSON object";
1110 SvREFCNT_dec (sv);
1111 sv = 0;
1112 }
1113 }
1114
1115 if (offset_return || !sv)
1116 {
1117 offset = dec.flags & F_UTF8
1118 ? dec.cur - SvPVX (string)
1119 : utf8_distance (dec.cur, SvPVX (string));
1120
1121 if (offset_return)
1122 *offset_return = offset;
1123 }
1124
877 if (!sv) 1125 if (!sv)
878 { 1126 {
879 IV offset = dec.flags & F_UTF8
880 ? dec.cur - SvPVX (string)
881 : utf8_distance (dec.cur, SvPVX (string));
882 SV *uni = sv_newmortal (); 1127 SV *uni = sv_newmortal ();
1128
883 // horrible hack to silence warning inside pv_uni_display 1129 // horrible hack to silence warning inside pv_uni_display
884 COP cop; 1130 COP cop = *PL_curcop;
885 memset (&cop, 0, sizeof (cop));
886 cop.cop_warnings = pWARN_NONE; 1131 cop.cop_warnings = pWARN_NONE;
1132 ENTER;
887 SAVEVPTR (PL_curcop); 1133 SAVEVPTR (PL_curcop);
888 PL_curcop = &cop; 1134 PL_curcop = &cop;
889
890 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1135 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1136 LEAVE;
1137
891 croak ("%s, at character offset %d (%s)", 1138 croak ("%s, at character offset %d [\"%s\"]",
892 dec.err, 1139 dec.err,
893 (int)offset, 1140 (int)offset,
894 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1141 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
895 } 1142 }
896 1143
897 sv = sv_2mortal (sv); 1144 sv = sv_2mortal (sv);
898 1145
899 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1146 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))
900 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1147 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
901 1148
902 return sv; 1149 return sv;
903} 1150}
904 1151
1152/////////////////////////////////////////////////////////////////////////////
1153// XS interface functions
1154
905MODULE = JSON::XS PACKAGE = JSON::XS 1155MODULE = JSON::XS PACKAGE = JSON::XS
906 1156
907BOOT: 1157BOOT:
908{ 1158{
909 int i; 1159 int i;
910 1160
911 memset (decode_hexdigit, 0xff, 256);
912 for (i = 10; i--; ) 1161 for (i = 0; i < 256; ++i)
913 decode_hexdigit ['0' + i] = i; 1162 decode_hexdigit [i] =
914 1163 i >= '0' && i <= '9' ? i - '0'
915 for (i = 7; i--; ) 1164 : i >= 'a' && i <= 'f' ? i - 'a' + 10
916 { 1165 : i >= 'A' && i <= 'F' ? i - 'A' + 10
917 decode_hexdigit ['a' + i] = 10 + i; 1166 : -1;
918 decode_hexdigit ['A' + i] = 10 + i;
919 }
920 1167
921 json_stash = gv_stashpv ("JSON::XS", 1); 1168 json_stash = gv_stashpv ("JSON::XS", 1);
1169
1170 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1171 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
922} 1172}
923 1173
924PROTOTYPES: DISABLE 1174PROTOTYPES: DISABLE
925 1175
926SV *new (char *dummy) 1176SV *new (char *dummy)
… …
930 RETVAL 1180 RETVAL
931 1181
932SV *ascii (SV *self, int enable = 1) 1182SV *ascii (SV *self, int enable = 1)
933 ALIAS: 1183 ALIAS:
934 ascii = F_ASCII 1184 ascii = F_ASCII
1185 latin1 = F_LATIN1
935 utf8 = F_UTF8 1186 utf8 = F_UTF8
936 indent = F_INDENT 1187 indent = F_INDENT
937 canonical = F_CANONICAL 1188 canonical = F_CANONICAL
938 space_before = F_SPACE_BEFORE 1189 space_before = F_SPACE_BEFORE
939 space_after = F_SPACE_AFTER 1190 space_after = F_SPACE_AFTER
940 json_rpc = F_JSON_RPC
941 pretty = F_PRETTY 1191 pretty = F_PRETTY
942 allow_nonref = F_ALLOW_NONREF 1192 allow_nonref = F_ALLOW_NONREF
943 shrink = F_SHRINK 1193 shrink = F_SHRINK
944 CODE: 1194 CODE:
945{ 1195{
… …
952 RETVAL = newSVsv (self); 1202 RETVAL = newSVsv (self);
953} 1203}
954 OUTPUT: 1204 OUTPUT:
955 RETVAL 1205 RETVAL
956 1206
1207SV *max_depth (SV *self, UV max_depth = 0x80000000UL)
1208 CODE:
1209{
1210 UV *uv = SvJSON (self);
1211 UV log2 = 0;
1212
1213 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1214
1215 while ((1UL << log2) < max_depth)
1216 ++log2;
1217
1218 *uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1219
1220 RETVAL = newSVsv (self);
1221}
1222 OUTPUT:
1223 RETVAL
1224
957void encode (SV *self, SV *scalar) 1225void encode (SV *self, SV *scalar)
958 PPCODE: 1226 PPCODE:
959 XPUSHs (encode_json (scalar, *SvJSON (self))); 1227 XPUSHs (encode_json (scalar, *SvJSON (self)));
960 1228
961void decode (SV *self, SV *jsonstr) 1229void decode (SV *self, SV *jsonstr)
962 PPCODE: 1230 PPCODE:
963 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1231 XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1232
1233void decode_prefix (SV *self, SV *jsonstr)
1234 PPCODE:
1235{
1236 UV offset;
1237 EXTEND (SP, 2);
1238 PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));
1239 PUSHs (sv_2mortal (newSVuv (offset)));
1240}
964 1241
965PROTOTYPES: ENABLE 1242PROTOTYPES: ENABLE
966 1243
967void to_json (SV *scalar) 1244void to_json (SV *scalar)
1245 ALIAS:
1246 objToJson = 0
968 PPCODE: 1247 PPCODE:
969 XPUSHs (encode_json (scalar, F_UTF8)); 1248 XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
970 1249
971void from_json (SV *jsonstr) 1250void from_json (SV *jsonstr)
1251 ALIAS:
1252 jsonToObj = 0
972 PPCODE: 1253 PPCODE:
973 XPUSHs (decode_json (jsonstr, F_UTF8)); 1254 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
974 1255

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