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Comparing JSON-XS/XS.xs (file contents):
Revision 1.2 by root, Thu Mar 22 17:28:50 2007 UTC vs.
Revision 1.39 by root, Mon Jun 11 03:42:57 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
21#define F_ALLOW_NONREF 0x00000100UL
15#define F_JSON_RPC 0x00000040 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? <=> { $__class__$ => }
16 30
17#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 31#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
18#define F_DEFAULT 0 32#define F_DEFAULT (9UL << S_MAXDEPTH)
19 33
20#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
21 38
22#define SB do { 39#define SB do {
23#define SE } while (0) 40#define SE } while (0)
24 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
25static 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
26 105
27// structure used for encoding JSON 106// structure used for encoding JSON
28typedef struct 107typedef struct
29{ 108{
30 char *cur; 109 char *cur; // SvPVX (sv) + current output position
31 STRLEN len; // SvLEN (sv)
32 char *end; // SvEND (sv) 110 char *end; // SvEND (sv)
33 SV *sv; 111 SV *sv; // result scalar
34 UV flags; 112 U32 flags; // F_*
35 int max_recurse; 113 U32 indent; // indentation level
36 int indent; 114 U32 maxdepth; // max. indentation/recursion level
37} enc_t; 115} enc_t;
38 116
39// structure used for decoding JSON 117inline void
40typedef struct
41{
42 char *cur;
43 char *end;
44 char *err;
45 UV flags;
46} dec_t;
47
48static UV *
49SvJSON (SV *sv)
50{
51 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
52 croak ("object is not of type JSON::XS");
53
54 return &SvUVX (SvRV (sv));
55}
56
57/////////////////////////////////////////////////////////////////////////////
58
59static void
60need (enc_t *enc, STRLEN len) 118need (enc_t *enc, STRLEN len)
61{ 119{
62 if (enc->cur + len >= enc->end) 120 if (expect_false (enc->cur + len >= enc->end))
63 { 121 {
64 STRLEN cur = enc->cur - SvPVX (enc->sv); 122 STRLEN cur = enc->cur - SvPVX (enc->sv);
65 SvGROW (enc->sv, cur + len + 1); 123 SvGROW (enc->sv, cur + len + 1);
66 enc->cur = SvPVX (enc->sv) + cur; 124 enc->cur = SvPVX (enc->sv) + cur;
67 enc->end = SvEND (enc->sv); 125 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
68 } 126 }
69} 127}
70 128
71static void 129inline void
72encode_ch (enc_t *enc, char ch) 130encode_ch (enc_t *enc, char ch)
73{ 131{
74 need (enc, 1); 132 need (enc, 1);
75 *enc->cur++ = ch; 133 *enc->cur++ = ch;
76} 134}
… …
78static void 136static void
79encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 137encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
80{ 138{
81 char *end = str + len; 139 char *end = str + len;
82 140
141 need (enc, len);
142
83 while (str < end) 143 while (str < end)
84 { 144 {
85 unsigned char ch = *(unsigned char *)str; 145 unsigned char ch = *(unsigned char *)str;
146
86 if (ch >= 0x20 && ch < 0x80) // most common case 147 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
87 { 148 {
149 if (expect_false (ch == '"')) // but with slow exceptions
150 {
151 need (enc, len += 1);
152 *enc->cur++ = '\\';
153 *enc->cur++ = '"';
154 }
155 else if (expect_false (ch == '\\'))
156 {
157 need (enc, len += 1);
158 *enc->cur++ = '\\';
159 *enc->cur++ = '\\';
160 }
161 else
88 *enc->cur++ = ch; 162 *enc->cur++ = ch;
163
89 str++; 164 ++str;
90 } 165 }
91 else 166 else
92 { 167 {
93 STRLEN clen; 168 switch (ch)
94 UV uch;
95
96 if (is_utf8)
97 { 169 {
98 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 170 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
99 if (clen < 0) 171 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
100 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 172 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
101 } 173 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
102 else 174 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
103 {
104 uch = ch;
105 clen = 1;
106 }
107 175
108 need (enc, len += 6); 176 default:
109
110 if (uch < 0xa0 || enc->flags & F_ASCII)
111 {
112 if (uch > 0xFFFFUL)
113 { 177 {
178 STRLEN clen;
179 UV uch;
180
181 if (is_utf8)
182 {
183 //uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
184 uch = decode_utf8 (str, end - str, &clen);
185 if (clen == (STRLEN)-1)
186 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
187 }
188 else
189 {
190 uch = ch;
114 len += 6; 191 clen = 1;
192 }
193
194 if (uch > 0x10FFFFUL)
195 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
196
197 if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
198 {
199 if (uch > 0xFFFFUL)
200 {
115 need (enc, len += 6); 201 need (enc, len += 11);
116 sprintf (enc->cur, "\\u%04x\\u%04x", 202 sprintf (enc->cur, "\\u%04x\\u%04x",
117 (uch - 0x10000) / 0x400 + 0xD800, 203 (int)((uch - 0x10000) / 0x400 + 0xD800),
118 (uch - 0x10000) % 0x400 + 0xDC00); 204 (int)((uch - 0x10000) % 0x400 + 0xDC00));
119 enc->cur += 12; 205 enc->cur += 12;
206 }
207 else
208 {
209 static char hexdigit [16] = "0123456789abcdef";
210 need (enc, len += 5);
211 *enc->cur++ = '\\';
212 *enc->cur++ = 'u';
213 *enc->cur++ = hexdigit [ uch >> 12 ];
214 *enc->cur++ = hexdigit [(uch >> 8) & 15];
215 *enc->cur++ = hexdigit [(uch >> 4) & 15];
216 *enc->cur++ = hexdigit [(uch >> 0) & 15];
217 }
218
219 str += clen;
120 } 220 }
221 else if (enc->flags & F_LATIN1)
222 {
223 *enc->cur++ = uch;
224 str += clen;
225 }
226 else if (is_utf8)
227 {
228 need (enc, len += clen);
229 do
230 {
231 *enc->cur++ = *str++;
232 }
233 while (--clen);
234 }
121 else 235 else
122 { 236 {
123 sprintf (enc->cur, "\\u%04x", uch); 237 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
124 enc->cur += 6; 238 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
239 ++str;
240 }
125 } 241 }
126 } 242 }
127 else if (is_utf8)
128 {
129 memcpy (enc->cur, str, clen);
130 enc->cur += clen;
131 }
132 else
133 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
134
135 str += clen;
136 } 243 }
137 244
138 --len; 245 --len;
139 } 246 }
140} 247}
141 248
142#define INDENT SB \ 249inline void
250encode_indent (enc_t *enc)
251{
143 if (enc->flags & F_INDENT) \ 252 if (enc->flags & F_INDENT)
144 { \ 253 {
145 int i_; \ 254 int spaces = enc->indent * INDENT_STEP;
146 need (enc, enc->indent); \
147 for (i_ = enc->indent * 3; i_--; )\
148 encode_ch (enc, ' '); \
149 } \
150 SE
151 255
152#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 256 need (enc, spaces);
153#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 257 memset (enc->cur, ' ', spaces);
154#define COMMA SB \ 258 enc->cur += spaces;
259 }
260}
261
262inline void
263encode_space (enc_t *enc)
264{
265 need (enc, 1);
155 encode_ch (enc, ','); \ 266 encode_ch (enc, ' ');
267}
268
269inline void
270encode_nl (enc_t *enc)
271{
156 if (enc->flags & F_INDENT) \ 272 if (enc->flags & F_INDENT)
157 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);
158 else if (enc->flags & F_SPACE_AFTER) \ 286 else if (enc->flags & F_SPACE_AFTER)
159 SPACE; \ 287 encode_space (enc);
160 SE 288}
161 289
162static void encode_sv (enc_t *enc, SV *sv); 290static void encode_sv (enc_t *enc, SV *sv);
163 291
164static void 292static void
165encode_av (enc_t *enc, AV *av) 293encode_av (enc_t *enc, AV *av)
166{ 294{
167 int i, len = av_len (av); 295 int i, len = av_len (av);
168 296
169 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);
170 ++enc->indent; 301 ++enc->indent;
171 302
172 for (i = 0; i <= len; ++i) 303 for (i = 0; i <= len; ++i)
173 { 304 {
174 INDENT; 305 encode_indent (enc);
175 encode_sv (enc, *av_fetch (av, i, 0)); 306 encode_sv (enc, *av_fetch (av, i, 0));
176 307
177 if (i < len) 308 if (i < len)
178 COMMA; 309 encode_comma (enc);
179 } 310 }
180 311
181 NL; 312 encode_nl (enc);
182 313
183 --enc->indent; 314 --enc->indent;
184 INDENT; encode_ch (enc, ']'); 315 encode_indent (enc); encode_ch (enc, ']');
185} 316}
186 317
187static void 318static void
188encode_he (enc_t *enc, HE *he) 319encode_he (enc_t *enc, HE *he)
189{ 320{
… …
191 322
192 if (HeKLEN (he) == HEf_SVKEY) 323 if (HeKLEN (he) == HEf_SVKEY)
193 { 324 {
194 SV *sv = HeSVKEY (he); 325 SV *sv = HeSVKEY (he);
195 STRLEN len; 326 STRLEN len;
327 char *str;
328
329 SvGETMAGIC (sv);
196 char *str = SvPV (sv, len); 330 str = SvPV (sv, len);
197 331
198 encode_str (enc, str, len, SvUTF8 (sv)); 332 encode_str (enc, str, len, SvUTF8 (sv));
199 } 333 }
200 else 334 else
201 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 335 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
202 336
203 encode_ch (enc, '"'); 337 encode_ch (enc, '"');
204 338
205 if (enc->flags & F_SPACE_BEFORE) SPACE; 339 if (enc->flags & F_SPACE_BEFORE) encode_space (enc);
206 encode_ch (enc, ':'); 340 encode_ch (enc, ':');
207 if (enc->flags & F_SPACE_AFTER ) SPACE; 341 if (enc->flags & F_SPACE_AFTER ) encode_space (enc);
208 encode_sv (enc, HeVAL (he)); 342 encode_sv (enc, HeVAL (he));
209} 343}
210 344
211// compare hash entries, used when all keys are bytestrings 345// compare hash entries, used when all keys are bytestrings
212static int 346static int
… …
218 HE *b = *(HE **)b_; 352 HE *b = *(HE **)b_;
219 353
220 STRLEN la = HeKLEN (a); 354 STRLEN la = HeKLEN (a);
221 STRLEN lb = HeKLEN (b); 355 STRLEN lb = HeKLEN (b);
222 356
223 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 357 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
224 cmp = la < lb ? -1 : la == lb ? 0 : 1; 358 cmp = la - lb;
225 359
226 return cmp; 360 return cmp;
227} 361}
228 362
229// 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
… …
236static void 370static void
237encode_hv (enc_t *enc, HV *hv) 371encode_hv (enc_t *enc, HV *hv)
238{ 372{
239 int count, i; 373 int count, i;
240 374
375 if (enc->indent >= enc->maxdepth)
376 croak ("data structure too deep (hit recursion limit)");
377
241 encode_ch (enc, '{'); NL; ++enc->indent; 378 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
242 379
243 if ((count = hv_iterinit (hv))) 380 if ((count = hv_iterinit (hv)))
244 { 381 {
245 // for canonical output we have to sort by keys first 382 // for canonical output we have to sort by keys first
246 // actually, this is mostly due to the stupid so-called 383 // actually, this is mostly due to the stupid so-called
247 // security workaround added somewhere in 5.8.x. 384 // security workaround added somewhere in 5.8.x.
248 // that randomises hash orderings 385 // that randomises hash orderings
249 if (enc->flags & F_CANONICAL) 386 if (enc->flags & F_CANONICAL)
250 { 387 {
251 HE *he, *hes [count];
252 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
253 395
254 i = 0; 396 i = 0;
255 while ((he = hv_iternext (hv))) 397 while ((he = hv_iternext (hv)))
256 { 398 {
257 hes [i++] = he; 399 hes [i++] = he;
… …
263 405
264 if (fast) 406 if (fast)
265 qsort (hes, count, sizeof (HE *), he_cmp_fast); 407 qsort (hes, count, sizeof (HE *), he_cmp_fast);
266 else 408 else
267 { 409 {
268 // hack to disable "use bytes" 410 // hack to forcefully disable "use bytes"
269 COP *oldcop = PL_curcop, cop; 411 COP cop = *PL_curcop;
270 cop.op_private = 0; 412 cop.op_private = 0;
413
414 ENTER;
415 SAVETMPS;
416
417 SAVEVPTR (PL_curcop);
271 PL_curcop = &cop; 418 PL_curcop = &cop;
272 419
273 SAVETMPS;
274 qsort (hes, count, sizeof (HE *), he_cmp_slow); 420 qsort (hes, count, sizeof (HE *), he_cmp_slow);
421
275 FREETMPS; 422 FREETMPS;
276 423 LEAVE;
277 PL_curcop = oldcop;
278 } 424 }
279 425
280 for (i = 0; i < count; ++i) 426 for (i = 0; i < count; ++i)
281 { 427 {
282 INDENT; 428 encode_indent (enc);
283 encode_he (enc, hes [i]); 429 encode_he (enc, hes [i]);
284 430
285 if (i < count - 1) 431 if (i < count - 1)
286 COMMA; 432 encode_comma (enc);
287 } 433 }
288 434
289 NL; 435 encode_nl (enc);
290 } 436 }
291 else 437 else
292 { 438 {
293 SV *sv;
294 HE *he = hv_iternext (hv); 439 HE *he = hv_iternext (hv);
295 440
296 for (;;) 441 for (;;)
297 { 442 {
298 INDENT; 443 encode_indent (enc);
299 encode_he (enc, he); 444 encode_he (enc, he);
300 445
301 if (!(he = hv_iternext (hv))) 446 if (!(he = hv_iternext (hv)))
302 break; 447 break;
303 448
304 COMMA; 449 encode_comma (enc);
305 } 450 }
306 451
307 NL; 452 encode_nl (enc);
308 } 453 }
309 } 454 }
310 455
311 --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))));
312} 485}
313 486
314static void 487static void
315encode_sv (enc_t *enc, SV *sv) 488encode_sv (enc_t *enc, SV *sv)
316{ 489{
490 SvGETMAGIC (sv);
491
317 if (SvPOKp (sv)) 492 if (SvPOKp (sv))
318 { 493 {
319 STRLEN len; 494 STRLEN len;
320 char *str = SvPV (sv, len); 495 char *str = SvPV (sv, len);
321 encode_ch (enc, '"'); 496 encode_ch (enc, '"');
322 encode_str (enc, str, len, SvUTF8 (sv)); 497 encode_str (enc, str, len, SvUTF8 (sv));
323 encode_ch (enc, '"'); 498 encode_ch (enc, '"');
324 } 499 }
325 else if (SvNOKp (sv)) 500 else if (SvNOKp (sv))
326 { 501 {
502 // trust that perl will do the right thing w.r.t. JSON syntax.
327 need (enc, NV_DIG + 32); 503 need (enc, NV_DIG + 32);
328 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 504 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
329 enc->cur += strlen (enc->cur); 505 enc->cur += strlen (enc->cur);
330 } 506 }
331 else if (SvIOKp (sv)) 507 else if (SvIOKp (sv))
332 { 508 {
333 need (enc, 64); 509 // we assume we can always read an IV as a UV
510 if (SvUV (sv) & ~(UV)0x7fff)
511 {
512 // large integer, use the (rather slow) snprintf way.
513 need (enc, sizeof (UV) * 3);
334 enc->cur += 514 enc->cur +=
335 SvIsUV(sv) 515 SvIsUV(sv)
336 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 516 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
337 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 517 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
518 }
519 else
520 {
521 // optimise the "small number case"
522 // code will likely be branchless and use only a single multiplication
523 I32 i = SvIV (sv);
524 U32 u;
525 char digit, nz = 0;
526
527 need (enc, 6);
528
529 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
530 u = i < 0 ? -i : i;
531
532 // convert to 4.28 fixed-point representation
533 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
534
535 // now output digit by digit, each time masking out the integer part
536 // and multiplying by 5 while moving the decimal point one to the right,
537 // resulting in a net multiplication by 10.
538 // we always write the digit to memory but conditionally increment
539 // the pointer, to ease the usage of conditional move instructions.
540 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
541 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
542 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
543 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
544 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
545 }
338 } 546 }
339 else if (SvROK (sv)) 547 else if (SvROK (sv))
340 { 548 encode_rv (enc, SvRV (sv));
341 if (!--enc->max_recurse)
342 croak ("data structure too deep (hit recursion limit)");
343
344 sv = SvRV (sv);
345
346 switch (SvTYPE (sv))
347 {
348 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
349 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
350
351 default:
352 croak ("JSON can only represent references to arrays or hashes");
353 }
354 }
355 else if (!SvOK (sv)) 549 else if (!SvOK (sv))
356 encode_str (enc, "null", 4, 0); 550 encode_str (enc, "null", 4, 0);
357 else 551 else
358 croak ("encountered perl type that JSON cannot handle"); 552 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
553 SvPV_nolen (sv), SvFLAGS (sv));
359} 554}
360 555
361static SV * 556static SV *
362encode_json (SV *scalar, UV flags) 557encode_json (SV *scalar, U32 flags)
363{ 558{
364 enc_t enc; 559 enc_t enc;
560
561 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
562 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
563
365 enc.flags = flags; 564 enc.flags = flags;
366 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 565 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
367 enc.cur = SvPVX (enc.sv); 566 enc.cur = SvPVX (enc.sv);
368 enc.end = SvEND (enc.sv); 567 enc.end = SvEND (enc.sv);
369 enc.max_recurse = 0;
370 enc.indent = 0; 568 enc.indent = 0;
569 enc.maxdepth = DEC_DEPTH (flags);
371 570
372 SvPOK_only (enc.sv); 571 SvPOK_only (enc.sv);
373 encode_sv (&enc, scalar); 572 encode_sv (&enc, scalar);
374 573
574 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
575 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
576
375 if (!(flags & (F_ASCII | F_UTF8))) 577 if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))
376 SvUTF8_on (enc.sv); 578 SvUTF8_on (enc.sv);
377 579
378 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 580 if (enc.flags & F_SHRINK)
581 shrink (enc.sv);
582
379 return enc.sv; 583 return enc.sv;
380} 584}
381 585
382///////////////////////////////////////////////////////////////////////////// 586/////////////////////////////////////////////////////////////////////////////
587// decoder
383 588
384#define WS \ 589// structure used for decoding JSON
590typedef struct
591{
592 char *cur; // current parser pointer
593 char *end; // end of input string
594 const char *err; // parse error, if != 0
595 U32 flags; // F_*
596 U32 depth; // recursion depth
597 U32 maxdepth; // recursion depth limit
598} dec_t;
599
600inline void
601decode_ws (dec_t *dec)
602{
385 for (;;) \ 603 for (;;)
386 { \ 604 {
387 char ch = *dec->cur; \ 605 char ch = *dec->cur;
606
388 if (ch > 0x20 \ 607 if (ch > 0x20
389 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 608 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
390 break; \ 609 break;
610
391 ++dec->cur; \ 611 ++dec->cur;
392 } 612 }
613}
393 614
394#define ERR(reason) SB dec->err = reason; goto fail; SE 615#define ERR(reason) SB dec->err = reason; goto fail; SE
616
395#define EXPECT_CH(ch) SB \ 617#define EXPECT_CH(ch) SB \
396 if (*dec->cur != ch) \ 618 if (*dec->cur != ch) \
397 ERR (# ch " expected"); \ 619 ERR (# ch " expected"); \
398 ++dec->cur; \ 620 ++dec->cur; \
399 SE 621 SE
400 622
623#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
624#define DEC_DEC_DEPTH --dec->depth
625
401static SV *decode_sv (dec_t *dec); 626static SV *decode_sv (dec_t *dec);
402
403#define APPEND_CH(ch) SB \
404 SvGROW (sv, cur + 1 + 1); \
405 SvPVX (sv)[cur++] = (ch); \
406 SE
407 627
408static signed char decode_hexdigit[256]; 628static signed char decode_hexdigit[256];
409 629
410static UV 630static UV
411decode_4hex (dec_t *dec) 631decode_4hex (dec_t *dec)
412{ 632{
413 signed char d1, d2, d3, d4; 633 signed char d1, d2, d3, d4;
634 unsigned char *cur = (unsigned char *)dec->cur;
414 635
415 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 636 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("four hexadecimal digits expected");
416 if (d1 < 0) ERR ("four hexadecimal digits expected"); 637 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("four hexadecimal digits expected");
417 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 638 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("four hexadecimal digits expected");
418 if (d2 < 0) ERR ("four hexadecimal digits expected"); 639 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("four hexadecimal digits expected");
419 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
420 if (d3 < 0) ERR ("four hexadecimal digits expected");
421 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
422 if (d4 < 0) ERR ("four hexadecimal digits expected");
423 640
424 dec->cur += 4; 641 dec->cur += 4;
425 642
426 return ((UV)d1) << 12 643 return ((UV)d1) << 12
427 | ((UV)d2) << 8 644 | ((UV)d2) << 8
… …
433} 650}
434 651
435static SV * 652static SV *
436decode_str (dec_t *dec) 653decode_str (dec_t *dec)
437{ 654{
438 SV *sv = NEWSV (0,2); 655 SV *sv = 0;
439 STRLEN cur = 0;
440 int utf8 = 0; 656 int utf8 = 0;
657 char *dec_cur = dec->cur;
441 658
442 for (;;) 659 do
443 { 660 {
444 unsigned char ch = *(unsigned char *)dec->cur; 661 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
662 char *cur = buf;
445 663
446 if (ch == '"') 664 do
447 break;
448 else if (ch == '\\')
449 { 665 {
450 switch (*++dec->cur) 666 unsigned char ch = *(unsigned char *)dec_cur++;
667
668 if (expect_false (ch == '"'))
451 { 669 {
452 case '\\': 670 --dec_cur;
453 case '/': 671 break;
454 case '"': APPEND_CH (*dec->cur++); break; 672 }
455 673 else if (expect_false (ch == '\\'))
456 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 674 {
457 case 't': APPEND_CH ('\011'); ++dec->cur; break; 675 switch (*dec_cur)
458 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
459 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
460 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
461
462 case 'u':
463 { 676 {
464 UV lo, hi; 677 case '\\':
465 ++dec->cur; 678 case '/':
679 case '"': *cur++ = *dec_cur++; break;
466 680
467 hi = decode_4hex (dec); 681 case 'b': ++dec_cur; *cur++ = '\010'; break;
468 if (hi == (UV)-1) 682 case 't': ++dec_cur; *cur++ = '\011'; break;
469 goto fail; 683 case 'n': ++dec_cur; *cur++ = '\012'; break;
684 case 'f': ++dec_cur; *cur++ = '\014'; break;
685 case 'r': ++dec_cur; *cur++ = '\015'; break;
470 686
471 // possibly a surrogate pair 687 case 'u':
472 if (hi >= 0xd800 && hi < 0xdc00)
473 { 688 {
474 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 689 UV lo, hi;
475 ERR ("illegal surrogate character"); 690 ++dec_cur;
476 691
477 dec->cur += 2; 692 dec->cur = dec_cur;
478
479 lo = decode_4hex (dec); 693 hi = decode_4hex (dec);
694 dec_cur = dec->cur;
480 if (lo == (UV)-1) 695 if (hi == (UV)-1)
481 goto fail; 696 goto fail;
482 697
698 // possibly a surrogate pair
699 if (hi >= 0xd800)
700 if (hi < 0xdc00)
701 {
702 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
703 ERR ("missing low surrogate character in surrogate pair");
704
705 dec_cur += 2;
706
707 dec->cur = dec_cur;
708 lo = decode_4hex (dec);
709 dec_cur = dec->cur;
710 if (lo == (UV)-1)
711 goto fail;
712
483 if (lo < 0xdc00 || lo >= 0xe000) 713 if (lo < 0xdc00 || lo >= 0xe000)
484 ERR ("surrogate pair expected"); 714 ERR ("surrogate pair expected");
485 715
486 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 716 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
717 }
718 else if (hi < 0xe000)
719 ERR ("missing high surrogate character in surrogate pair");
720
721 if (hi >= 0x80)
722 {
723 utf8 = 1;
724
725 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
726 }
727 else
728 *cur++ = hi;
487 } 729 }
488 else if (lo >= 0xdc00 && lo < 0xe000)
489 ERR ("illegal surrogate character");
490
491 if (hi >= 0x80)
492 { 730 break;
493 utf8 = 1;
494 731
495 SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
496 cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
497 }
498 else 732 default:
499 APPEND_CH (hi); 733 --dec_cur;
734 ERR ("illegal backslash escape sequence in string");
500 } 735 }
736 }
737 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
738 *cur++ = ch;
739 else if (ch >= 0x80)
740 {
741 STRLEN clen;
742 UV uch;
743
744 --dec_cur;
745
746 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
747 if (clen == (STRLEN)-1)
748 ERR ("malformed UTF-8 character in JSON string");
749
750 do
751 *cur++ = *dec_cur++;
752 while (--clen);
753
754 utf8 = 1;
755 }
756 else
757 {
758 --dec_cur;
759
760 if (!ch)
761 ERR ("unexpected end of string while parsing JSON string");
501 break; 762 else
763 ERR ("invalid character encountered while parsing JSON string");
502 } 764 }
503 } 765 }
504 else if (ch >= 0x20 && ch <= 0x7f) 766 while (cur < buf + SHORT_STRING_LEN);
505 APPEND_CH (*dec->cur++); 767
506 else if (ch >= 0x80) 768 {
769 STRLEN len = cur - buf;
770
771 if (sv)
507 { 772 {
508 STRLEN clen; 773 SvGROW (sv, SvCUR (sv) + len + 1);
509 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 774 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
510 if (clen < 0) 775 SvCUR_set (sv, SvCUR (sv) + len);
511 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
512
513 SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits
514 memcpy (SvPVX (sv) + cur, dec->cur, clen);
515 dec->cur += clen;
516 } 776 }
517 else 777 else
518 ERR ("invalid character encountered"); 778 sv = newSVpvn (buf, len);
519 } 779 }
780 }
781 while (*dec_cur != '"');
520 782
521 ++dec->cur; 783 ++dec_cur;
522 784
785 if (sv)
786 {
523 SvPOK_only (sv); 787 SvPOK_only (sv);
524
525 SvCUR_set (sv, cur);
526 *SvEND (sv) = 0; 788 *SvEND (sv) = 0;
527 789
528 if (utf8) 790 if (utf8)
529 SvUTF8_on (sv); 791 SvUTF8_on (sv);
792 }
793 else
794 sv = newSVpvn ("", 0);
530 795
796 dec->cur = dec_cur;
531 return sv; 797 return sv;
532 798
533fail: 799fail:
534 SvREFCNT_dec (sv); 800 dec->cur = dec_cur;
535 return 0; 801 return 0;
536} 802}
537 803
538static SV * 804static SV *
539decode_num (dec_t *dec) 805decode_num (dec_t *dec)
… …
549 { 815 {
550 ++dec->cur; 816 ++dec->cur;
551 if (*dec->cur >= '0' && *dec->cur <= '9') 817 if (*dec->cur >= '0' && *dec->cur <= '9')
552 ERR ("malformed number (leading zero must not be followed by another digit)"); 818 ERR ("malformed number (leading zero must not be followed by another digit)");
553 } 819 }
554 820 else if (*dec->cur < '0' || *dec->cur > '9')
555 // int 821 ERR ("malformed number (no digits after initial minus)");
822 else
823 do
824 {
825 ++dec->cur;
826 }
556 while (*dec->cur >= '0' && *dec->cur <= '9') 827 while (*dec->cur >= '0' && *dec->cur <= '9');
557 ++dec->cur;
558 828
559 // [frac] 829 // [frac]
560 if (*dec->cur == '.') 830 if (*dec->cur == '.')
561 { 831 {
562 is_nv = 1; 832 ++dec->cur;
833
834 if (*dec->cur < '0' || *dec->cur > '9')
835 ERR ("malformed number (no digits after decimal point)");
563 836
564 do 837 do
565 { 838 {
566 ++dec->cur; 839 ++dec->cur;
567 } 840 }
568 while (*dec->cur >= '0' && *dec->cur <= '9'); 841 while (*dec->cur >= '0' && *dec->cur <= '9');
842
843 is_nv = 1;
569 } 844 }
570 845
571 // [exp] 846 // [exp]
572 if (*dec->cur == 'e' || *dec->cur == 'E') 847 if (*dec->cur == 'e' || *dec->cur == 'E')
573 { 848 {
574 is_nv = 1;
575
576 ++dec->cur; 849 ++dec->cur;
850
577 if (*dec->cur == '-' || *dec->cur == '+') 851 if (*dec->cur == '-' || *dec->cur == '+')
578 ++dec->cur; 852 ++dec->cur;
579 853
854 if (*dec->cur < '0' || *dec->cur > '9')
855 ERR ("malformed number (no digits after exp sign)");
856
857 do
858 {
859 ++dec->cur;
860 }
580 while (*dec->cur >= '0' && *dec->cur <= '9') 861 while (*dec->cur >= '0' && *dec->cur <= '9');
581 ++dec->cur; 862
863 is_nv = 1;
582 } 864 }
583 865
584 if (!is_nv) 866 if (!is_nv)
585 { 867 {
586 UV uv; 868 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
587 int numtype = grok_number (start, dec->cur - start, &uv); 869 if (*start == '-')
588 if (numtype & IS_NUMBER_IN_UV) 870 switch (dec->cur - start)
589 if (numtype & IS_NUMBER_NEG)
590 { 871 {
591 if (uv < (UV)IV_MIN) 872 case 2: return newSViv (-( start [1] - '0' ));
592 return newSViv (-(IV)uv); 873 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
874 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
875 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
593 } 876 }
877 else
878 switch (dec->cur - start)
879 {
880 case 1: return newSViv ( start [0] - '0' );
881 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
882 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
883 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
884 }
885
886 {
887 UV uv;
888 int numtype = grok_number (start, dec->cur - start, &uv);
889 if (numtype & IS_NUMBER_IN_UV)
890 if (numtype & IS_NUMBER_NEG)
891 {
892 if (uv < (UV)IV_MIN)
893 return newSViv (-(IV)uv);
894 }
594 else 895 else
595 return newSVuv (uv); 896 return newSVuv (uv);
897 }
596 } 898 }
597 899
598 return newSVnv (Atof (start)); 900 return newSVnv (Atof (start));
599 901
600fail: 902fail:
… …
604static SV * 906static SV *
605decode_av (dec_t *dec) 907decode_av (dec_t *dec)
606{ 908{
607 AV *av = newAV (); 909 AV *av = newAV ();
608 910
911 DEC_INC_DEPTH;
912 decode_ws (dec);
913
914 if (*dec->cur == ']')
915 ++dec->cur;
916 else
609 for (;;) 917 for (;;)
610 { 918 {
611 SV *value; 919 SV *value;
612 920
613 value = decode_sv (dec); 921 value = decode_sv (dec);
614 if (!value) 922 if (!value)
615 goto fail; 923 goto fail;
616 924
617 av_push (av, value); 925 av_push (av, value);
618 926
619 WS; 927 decode_ws (dec);
620 928
621 if (*dec->cur == ']') 929 if (*dec->cur == ']')
622 { 930 {
623 ++dec->cur; 931 ++dec->cur;
624 break; 932 break;
933 }
625 } 934
626
627 if (*dec->cur != ',') 935 if (*dec->cur != ',')
628 ERR (", or ] expected while parsing array"); 936 ERR (", or ] expected while parsing array");
629 937
630 ++dec->cur; 938 ++dec->cur;
631 } 939 }
632 940
941 DEC_DEC_DEPTH;
633 return newRV_noinc ((SV *)av); 942 return newRV_noinc ((SV *)av);
634 943
635fail: 944fail:
636 SvREFCNT_dec (av); 945 SvREFCNT_dec (av);
946 DEC_DEC_DEPTH;
637 return 0; 947 return 0;
638} 948}
639 949
640static SV * 950static SV *
641decode_hv (dec_t *dec) 951decode_hv (dec_t *dec)
642{ 952{
643 HV *hv = newHV (); 953 HV *hv = newHV ();
644 954
955 DEC_INC_DEPTH;
956 decode_ws (dec);
957
958 if (*dec->cur == '}')
959 ++dec->cur;
960 else
645 for (;;) 961 for (;;)
646 { 962 {
647 SV *key, *value; 963 SV *key, *value;
648 964
649 WS; EXPECT_CH ('"'); 965 decode_ws (dec); EXPECT_CH ('"');
650 966
651 key = decode_str (dec); 967 key = decode_str (dec);
652 if (!key) 968 if (!key)
653 goto fail;
654
655 WS; EXPECT_CH (':');
656
657 value = decode_sv (dec);
658 if (!value)
659 {
660 SvREFCNT_dec (key);
661 goto fail; 969 goto fail;
970
971 decode_ws (dec); EXPECT_CH (':');
972
973 value = decode_sv (dec);
974 if (!value)
975 {
976 SvREFCNT_dec (key);
977 goto fail;
662 } 978 }
663 979
664 //TODO: optimise
665 hv_store_ent (hv, key, value, 0); 980 hv_store_ent (hv, key, value, 0);
981 SvREFCNT_dec (key);
666 982
667 WS; 983 decode_ws (dec);
668 984
669 if (*dec->cur == '}') 985 if (*dec->cur == '}')
670 { 986 {
671 ++dec->cur; 987 ++dec->cur;
672 break; 988 break;
673 } 989 }
674 990
675 if (*dec->cur != ',') 991 if (*dec->cur != ',')
676 ERR (", or } expected while parsing object/hash"); 992 ERR (", or } expected while parsing object/hash");
677 993
678 ++dec->cur; 994 ++dec->cur;
679 } 995 }
680 996
997 DEC_DEC_DEPTH;
681 return newRV_noinc ((SV *)hv); 998 return newRV_noinc ((SV *)hv);
682 999
683fail: 1000fail:
684 SvREFCNT_dec (hv); 1001 SvREFCNT_dec (hv);
1002 DEC_DEC_DEPTH;
685 return 0; 1003 return 0;
686} 1004}
687 1005
688static SV * 1006static SV *
689decode_sv (dec_t *dec) 1007decode_sv (dec_t *dec)
690{ 1008{
691 WS; 1009 decode_ws (dec);
692 switch (*dec->cur) 1010 switch (*dec->cur)
693 { 1011 {
694 case '"': ++dec->cur; return decode_str (dec); 1012 case '"': ++dec->cur; return decode_str (dec);
695 case '[': ++dec->cur; return decode_av (dec); 1013 case '[': ++dec->cur; return decode_av (dec);
696 case '{': ++dec->cur; return decode_hv (dec); 1014 case '{': ++dec->cur; return decode_hv (dec);
… …
724 1042
725 case 'n': 1043 case 'n':
726 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1044 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
727 { 1045 {
728 dec->cur += 4; 1046 dec->cur += 4;
729 return newSViv (1); 1047 return newSVsv (&PL_sv_undef);
730 } 1048 }
731 else 1049 else
732 ERR ("'null' expected"); 1050 ERR ("'null' expected");
733 1051
734 break; 1052 break;
735 1053
736 default: 1054 default:
737 ERR ("malformed json string"); 1055 ERR ("malformed JSON string, neither array, object, number, string or atom");
738 break; 1056 break;
739 } 1057 }
740 1058
741fail: 1059fail:
742 return 0; 1060 return 0;
743} 1061}
744 1062
745static SV * 1063static SV *
746decode_json (SV *string, UV flags) 1064decode_json (SV *string, U32 flags, UV *offset_return)
747{ 1065{
1066 dec_t dec;
1067 UV offset;
748 SV *sv; 1068 SV *sv;
749 1069
1070 SvGETMAGIC (string);
1071 SvUPGRADE (string, SVt_PV);
1072
750 if (!(flags & F_UTF8)) 1073 if (flags & F_UTF8)
1074 sv_utf8_downgrade (string, 0);
1075 else
751 sv_utf8_upgrade (string); 1076 sv_utf8_upgrade (string);
752 1077
753 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1078 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
754 1079
755 dec_t dec;
756 dec.flags = flags; 1080 dec.flags = flags;
757 dec.cur = SvPVX (string); 1081 dec.cur = SvPVX (string);
758 dec.end = SvEND (string); 1082 dec.end = SvEND (string);
759 dec.err = 0; 1083 dec.err = 0;
1084 dec.depth = 0;
1085 dec.maxdepth = DEC_DEPTH (dec.flags);
760 1086
761 *dec.end = 1; // invalid anywhere 1087 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
762 sv = decode_sv (&dec); 1088 sv = decode_sv (&dec);
763 *dec.end = 0; 1089
1090 if (!(offset_return || !sv))
1091 {
1092 // check for trailing garbage
1093 decode_ws (&dec);
1094
1095 if (*dec.cur)
1096 {
1097 dec.err = "garbage after JSON object";
1098 SvREFCNT_dec (sv);
1099 sv = 0;
1100 }
1101 }
1102
1103 if (offset_return || !sv)
1104 {
1105 offset = dec.flags & F_UTF8
1106 ? dec.cur - SvPVX (string)
1107 : utf8_distance (dec.cur, SvPVX (string));
1108
1109 if (offset_return)
1110 *offset_return = offset;
1111 }
764 1112
765 if (!sv) 1113 if (!sv)
766 { 1114 {
767 IV offset = utf8_distance (dec.cur, SvPVX (string));
768 SV *uni = sv_newmortal (); 1115 SV *uni = sv_newmortal ();
769 1116
1117 // horrible hack to silence warning inside pv_uni_display
1118 COP cop = *PL_curcop;
1119 cop.cop_warnings = pWARN_NONE;
1120 ENTER;
1121 SAVEVPTR (PL_curcop);
1122 PL_curcop = &cop;
770 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1123 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1124 LEAVE;
1125
771 croak ("%s, at character %d (%s)", 1126 croak ("%s, at character offset %d [\"%s\"]",
772 dec.err, 1127 dec.err,
773 (int)offset, 1128 (int)offset,
774 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1129 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
775 } 1130 }
776 1131
777 sv_dump (sv);//D
778 return sv_2mortal (sv); 1132 sv = sv_2mortal (sv);
1133
1134 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))
1135 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1136
1137 return sv;
779} 1138}
1139
1140/////////////////////////////////////////////////////////////////////////////
1141// XS interface functions
780 1142
781MODULE = JSON::XS PACKAGE = JSON::XS 1143MODULE = JSON::XS PACKAGE = JSON::XS
782 1144
783BOOT: 1145BOOT:
784{ 1146{
785 int i; 1147 int i;
786 1148
787 memset (decode_hexdigit, 0xff, 256); 1149 memset (decode_hexdigit, 0xff, 256);
1150
788 for (i = 10; i--; ) 1151 for (i = 0; i < 256; ++i)
789 decode_hexdigit ['0' + i] = i; 1152 decode_hexdigit [i] =
790 1153 i >= '0' && i <= '9' ? i - '0'
791 for (i = 6; --i; ) 1154 : i >= 'a' && i <= 'f' ? i - 'a' + 10
792 { 1155 : i >= 'A' && i <= 'F' ? i - 'A' + 10
793 decode_hexdigit ['a' + i] = 10 + i; 1156 : -1;
794 decode_hexdigit ['A' + i] = 10 + i;
795 }
796 1157
797 json_stash = gv_stashpv ("JSON::XS", 1); 1158 json_stash = gv_stashpv ("JSON::XS", 1);
798} 1159}
1160
1161PROTOTYPES: DISABLE
799 1162
800SV *new (char *dummy) 1163SV *new (char *dummy)
801 CODE: 1164 CODE:
802 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1165 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);
803 OUTPUT: 1166 OUTPUT:
804 RETVAL 1167 RETVAL
805 1168
806SV *ascii (SV *self, int enable) 1169SV *ascii (SV *self, int enable = 1)
807 ALIAS: 1170 ALIAS:
808 ascii = F_ASCII 1171 ascii = F_ASCII
1172 latin1 = F_LATIN1
809 utf8 = F_UTF8 1173 utf8 = F_UTF8
810 indent = F_INDENT 1174 indent = F_INDENT
811 canonical = F_CANONICAL 1175 canonical = F_CANONICAL
812 space_before = F_SPACE_BEFORE 1176 space_before = F_SPACE_BEFORE
813 space_after = F_SPACE_AFTER 1177 space_after = F_SPACE_AFTER
814 json_rpc = F_JSON_RPC
815 pretty = F_PRETTY 1178 pretty = F_PRETTY
1179 allow_nonref = F_ALLOW_NONREF
1180 shrink = F_SHRINK
816 CODE: 1181 CODE:
817{ 1182{
818 UV *uv = SvJSON (self); 1183 UV *uv = SvJSON (self);
819 if (enable) 1184 if (enable)
820 *uv |= ix; 1185 *uv |= ix;
… …
824 RETVAL = newSVsv (self); 1189 RETVAL = newSVsv (self);
825} 1190}
826 OUTPUT: 1191 OUTPUT:
827 RETVAL 1192 RETVAL
828 1193
1194SV *max_depth (SV *self, UV max_depth = 0x80000000UL)
1195 CODE:
1196{
1197 UV *uv = SvJSON (self);
1198 UV log2 = 0;
1199
1200 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1201
1202 while ((1UL << log2) < max_depth)
1203 ++log2;
1204
1205 *uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1206
1207 RETVAL = newSVsv (self);
1208}
1209 OUTPUT:
1210 RETVAL
1211
829void encode (SV *self, SV *scalar) 1212void encode (SV *self, SV *scalar)
830 PPCODE: 1213 PPCODE:
831 XPUSHs (encode_json (scalar, *SvJSON (self))); 1214 XPUSHs (encode_json (scalar, *SvJSON (self)));
832 1215
833void decode (SV *self, SV *jsonstr) 1216void decode (SV *self, SV *jsonstr)
834 PPCODE: 1217 PPCODE:
835 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1218 XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1219
1220void decode_prefix (SV *self, SV *jsonstr)
1221 PPCODE:
1222{
1223 UV offset;
1224 EXTEND (SP, 2);
1225 PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));
1226 PUSHs (sv_2mortal (newSVuv (offset)));
1227}
1228
1229PROTOTYPES: ENABLE
836 1230
837void to_json (SV *scalar) 1231void to_json (SV *scalar)
1232 ALIAS:
1233 objToJson = 0
838 PPCODE: 1234 PPCODE:
839 XPUSHs (encode_json (scalar, F_UTF8)); 1235 XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
840 1236
841void from_json (SV *jsonstr) 1237void from_json (SV *jsonstr)
1238 ALIAS:
1239 jsonToObj = 0
842 PPCODE: 1240 PPCODE:
843 XPUSHs (decode_json (jsonstr, F_UTF8)); 1241 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
844 1242

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