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Comparing JSON-XS/XS.xs (file contents):
Revision 1.9 by root, Fri Mar 23 17:40:29 2007 UTC vs.
Revision 1.74 by root, Wed Mar 19 15:17:53 2008 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include <assert.h>
6	#include "string.h"	6	#include <string.h>
7	#include "stdlib.h"	7	#include <stdlib.h>
		8	#include <stdio.h>
		9	#include <float.h>
8		10
		11	#if defined(__BORLANDC__) || defined(_MSC_VER)
		12	# define snprintf _snprintf // C compilers have this in stdio.h
		13	#endif
		14
		15	// some old perls do not have this, try to make it work, no
		16	// guarentees, though. if it breaks, you get to keep the pieces.
		17	#ifndef UTF8_MAXBYTES
		18	# define UTF8_MAXBYTES 13
		19	#endif
		20
9	#define F_ASCII 0x00000001	21	#define F_ASCII 0x00000001UL
		22	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	23	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	24	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	25	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	26	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	27	#define F_SPACE_AFTER 0x00000040UL
15	#define F_JSON_RPC 0x00000040
16	#define F_ALLOW_NONREF 0x00000080	28	#define F_ALLOW_NONREF 0x00000100UL
17	#define F_SHRINK 0x00000100	29	#define F_SHRINK 0x00000200UL
		30	#define F_ALLOW_BLESSED 0x00000400UL
		31	#define F_CONV_BLESSED 0x00000800UL
		32	#define F_RELAXED 0x00001000UL
		33
		34	#define F_MAXDEPTH 0xf8000000UL
		35	#define S_MAXDEPTH 27
		36	#define F_MAXSIZE 0x01f00000UL
		37	#define S_MAXSIZE 20
		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		39
		40	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		41	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
18		42
19	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	43	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20	#define F_DEFAULT 0	44	#define F_DEFAULT (9UL << S_MAXDEPTH)
21		45
22	#define INIT_SIZE 32 // initial scalar size to be allocated	46	#define INIT_SIZE 32 // initial scalar size to be allocated
		47	#define INDENT_STEP 3 // spaces per indentation level
		48
		49	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23		50
24	#define SB do {	51	#define SB do {
25	#define SE } while (0)	52	#define SE } while (0)
26		53
27	static HV *json_stash;	54	#if __GNUC__ >= 3
		55	# define expect(expr,value) __builtin_expect ((expr), (value))
		56	# define INLINE static inline
		57	#else
		58	# define expect(expr,value) (expr)
		59	# define INLINE static
		60	#endif
		61
		62	#define expect_false(expr) expect ((expr) != 0, 0)
		63	#define expect_true(expr) expect ((expr) != 0, 1)
		64
		65	#define IN_RANGE_INC(type,val,beg,end) \
		66	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		67	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		68
		69	#ifdef USE_ITHREADS
		70	# define JSON_SLOW 1
		71	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		72	#else
		73	# define JSON_SLOW 0
		74	# define JSON_STASH json_stash
		75	#endif
		76
		77	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		78	static SV *json_true, *json_false;
		79
		80	typedef struct {
		81	U32 flags;
		82	SV *cb_object;
		83	HV *cb_sk_object;
		84	} JSON;
		85
		86	/////////////////////////////////////////////////////////////////////////////
		87	// utility functions
		88
		89	INLINE void
		90	shrink (SV *sv)
		91	{
		92	sv_utf8_downgrade (sv, 1);
		93	if (SvLEN (sv) > SvCUR (sv) + 1)
		94	{
		95	#ifdef SvPV_shrink_to_cur
		96	SvPV_shrink_to_cur (sv);
		97	#elif defined (SvPV_renew)
		98	SvPV_renew (sv, SvCUR (sv) + 1);
		99	#endif
		100	}
		101	}
		102
		103	// decode an utf-8 character and return it, or (UV)-1 in
		104	// case of an error.
		105	// we special-case "safe" characters from U+80 .. U+7FF,
		106	// but use the very good perl function to parse anything else.
		107	// note that we never call this function for a ascii codepoints
		108	INLINE UV
		109	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		110	{
		111	if (expect_true (len >= 2
		112	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		113	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		114	{
		115	*clen = 2;
		116	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		117	}
		118	else
		119	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		120	}
		121
		122	// likewise for encoding, also never called for ascii codepoints
		123	// this function takes advantage of this fact, although current gccs
		124	// seem to optimise the check for >= 0x80 away anyways
		125	INLINE unsigned char *
		126	encode_utf8 (unsigned char *s, UV ch)
		127	{
		128	if (expect_false (ch < 0x000080))
		129	*s++ = ch;
		130	else if (expect_true (ch < 0x000800))
		131	*s++ = 0xc0 | ( ch >> 6),
		132	*s++ = 0x80 | ( ch & 0x3f);
		133	else if ( ch < 0x010000)
		134	*s++ = 0xe0 | ( ch >> 12),
		135	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		136	*s++ = 0x80 | ( ch & 0x3f);
		137	else if ( ch < 0x110000)
		138	*s++ = 0xf0 | ( ch >> 18),
		139	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		140	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		141	*s++ = 0x80 | ( ch & 0x3f);
		142
		143	return s;
		144	}
		145
		146	/////////////////////////////////////////////////////////////////////////////
		147	// encoder
28		148
29	// structure used for encoding JSON	149	// structure used for encoding JSON
30	typedef struct	150	typedef struct
31	{	151	{
32	char *cur;	152	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	153	char *end; // SvEND (sv)
35	SV *sv;	154	SV *sv; // result scalar
36	UV flags;	155	JSON json;
37	int max_recurse;	156	U32 indent; // indentation level
38	int indent;	157	U32 maxdepth; // max. indentation/recursion level
		158	UV limit; // escape character values >= this value when encoding
39	} enc_t;	159	} enc_t;
40		160
41	// structure used for decoding JSON	161	INLINE void
42	typedef struct
43	{
44	char *cur;
45	char *end;
46	const char *err;
47	UV flags;
48	} dec_t;
49
50	static UV *
51	SvJSON (SV *sv)
52	{
53	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
54	croak ("object is not of type JSON::XS");
55
56	return &SvUVX (SvRV (sv));
57	}
58
59	static void
60	shrink (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
70	static void
71	need (enc_t *enc, STRLEN len)	162	need (enc_t *enc, STRLEN len)
72	{	163	{
73	if (enc->cur + len >= enc->end)	164	if (expect_false (enc->cur + len >= enc->end))
74	{	165	{
75	STRLEN cur = enc->cur - SvPVX (enc->sv);	166	STRLEN cur = enc->cur - SvPVX (enc->sv);
76	SvGROW (enc->sv, cur + len + 1);	167	SvGROW (enc->sv, cur + len + 1);
77	enc->cur = SvPVX (enc->sv) + cur;	168	enc->cur = SvPVX (enc->sv) + cur;
78	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	169	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79	}	170	}
80	}	171	}
81		172
82	static void	173	INLINE void
83	encode_ch (enc_t *enc, char ch)	174	encode_ch (enc_t *enc, char ch)
84	{	175	{
85	need (enc, 1);	176	need (enc, 1);
86	*enc->cur++ = ch;	177	*enc->cur++ = ch;
87	}	178	}
…		…
95		186
96	while (str < end)	187	while (str < end)
97	{	188	{
98	unsigned char ch = *(unsigned char *)str;	189	unsigned char ch = *(unsigned char *)str;
99		190
100	if (ch >= 0x20 && ch < 0x80) // most common case	191	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101	{	192	{
102	if (ch == '"') // but with slow exceptions	193	if (expect_false (ch == '"')) // but with slow exceptions
103	{	194	{
104	need (enc, len += 1);	195	need (enc, len += 1);
105	*enc->cur++ = '\\';	196	*enc->cur++ = '\\';
106	*enc->cur++ = '"';	197	*enc->cur++ = '"';
107	}	198	}
108	else if (ch == '\\')	199	else if (expect_false (ch == '\\'))
109	{	200	{
110	need (enc, len += 1);	201	need (enc, len += 1);
111	*enc->cur++ = '\\';	202	*enc->cur++ = '\\';
112	*enc->cur++ = '\\';	203	*enc->cur++ = '\\';
113	}	204	}
…		…
131	STRLEN clen;	222	STRLEN clen;
132	UV uch;	223	UV uch;
133		224
134	if (is_utf8)	225	if (is_utf8)
135	{	226	{
136	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	227	uch = decode_utf8 (str, end - str, &clen);
137	if (clen == (STRLEN)-1)	228	if (clen == (STRLEN)-1)
138	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	229	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139	}	230	}
140	else	231	else
141	{	232	{
142	uch = ch;	233	uch = ch;
143	clen = 1;	234	clen = 1;
144	}	235	}
145		236
146	if (uch > 0x10FFFFUL)	237	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
147	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
148
149	if (uch < 0x80 || enc->flags & F_ASCII)
150	{	238	{
151	if (uch > 0xFFFFUL)	239	if (uch >= 0x10000UL)
152	{	240	{
		241	if (uch >= 0x110000UL)
		242	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		243
153	need (enc, len += 11);	244	need (enc, len += 11);
154	sprintf (enc->cur, "\\u%04x\\u%04x",	245	sprintf (enc->cur, "\\u%04x\\u%04x",
155	(uch - 0x10000) / 0x400 + 0xD800,	246	(int)((uch - 0x10000) / 0x400 + 0xD800),
156	(uch - 0x10000) % 0x400 + 0xDC00);	247	(int)((uch - 0x10000) % 0x400 + 0xDC00));
157	enc->cur += 12;	248	enc->cur += 12;
158	}	249	}
159	else	250	else
160	{	251	{
161	static char hexdigit [16] = "0123456789abcdef";	252	static char hexdigit [16] = "0123456789abcdef";
…		…
168	*enc->cur++ = hexdigit [(uch >> 0) & 15];	259	*enc->cur++ = hexdigit [(uch >> 0) & 15];
169	}	260	}
170		261
171	str += clen;	262	str += clen;
172	}	263	}
		264	else if (enc->json.flags & F_LATIN1)
		265	{
		266	*enc->cur++ = uch;
		267	str += clen;
		268	}
173	else if (is_utf8)	269	else if (is_utf8)
174	{	270	{
175	need (enc, len += clen);	271	need (enc, len += clen);
176	do	272	do
177	{	273	{
…		…
179	}	275	}
180	while (--clen);	276	while (--clen);
181	}	277	}
182	else	278	else
183	{	279	{
184	need (enc, len += 10); // never more than 11 bytes needed	280	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
185	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	281	enc->cur = encode_utf8 (enc->cur, uch);
186	++str;	282	++str;
187	}	283	}
188	}	284	}
189	}	285	}
190	}	286	}
191		287
192	--len;	288	--len;
193	}	289	}
194	}	290	}
195		291
196	#define INDENT SB \	292	INLINE void
		293	encode_indent (enc_t *enc)
		294	{
197	if (enc->flags & F_INDENT) \	295	if (enc->json.flags & F_INDENT)
198	{ \	296	{
199	int i_; \	297	int spaces = enc->indent * INDENT_STEP;
200	need (enc, enc->indent); \	298
201	for (i_ = enc->indent * 3; i_--; )\	299	need (enc, spaces);
		300	memset (enc->cur, ' ', spaces);
		301	enc->cur += spaces;
		302	}
		303	}
		304
		305	INLINE void
		306	encode_space (enc_t *enc)
		307	{
		308	need (enc, 1);
		309	encode_ch (enc, ' ');
		310	}
		311
		312	INLINE void
		313	encode_nl (enc_t *enc)
		314	{
		315	if (enc->json.flags & F_INDENT)
		316	{
		317	need (enc, 1);
202	encode_ch (enc, ' '); \	318	encode_ch (enc, '\n');
203	} \	319	}
204	SE	320	}
205		321
206	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	322	INLINE void
207	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	323	encode_comma (enc_t *enc)
208	#define COMMA SB \	324	{
209	encode_ch (enc, ','); \	325	encode_ch (enc, ',');
		326
210	if (enc->flags & F_INDENT) \	327	if (enc->json.flags & F_INDENT)
211	NL; \	328	encode_nl (enc);
212	else if (enc->flags & F_SPACE_AFTER) \	329	else if (enc->json.flags & F_SPACE_AFTER)
213	SPACE; \	330	encode_space (enc);
214	SE	331	}
215		332
216	static void encode_sv (enc_t *enc, SV *sv);	333	static void encode_sv (enc_t *enc, SV *sv);
217		334
218	static void	335	static void
219	encode_av (enc_t *enc, AV *av)	336	encode_av (enc_t *enc, AV *av)
220	{	337	{
221	int i, len = av_len (av);	338	int i, len = av_len (av);
222		339
		340	if (enc->indent >= enc->maxdepth)
		341	croak ("data structure too deep (hit recursion limit)");
		342
223	encode_ch (enc, '['); NL;	343	encode_ch (enc, '[');
224	++enc->indent;	344
		345	if (len >= 0)
		346	{
		347	encode_nl (enc); ++enc->indent;
225		348
226	for (i = 0; i <= len; ++i)	349	for (i = 0; i <= len; ++i)
227	{	350	{
228	INDENT;	351	SV **svp = av_fetch (av, i, 0);
229	encode_sv (enc, *av_fetch (av, i, 0));
230		352
		353	encode_indent (enc);
		354
		355	if (svp)
		356	encode_sv (enc, *svp);
		357	else
		358	encode_str (enc, "null", 4, 0);
		359
231	if (i < len)	360	if (i < len)
232	COMMA;	361	encode_comma (enc);
233	}	362	}
234		363
235	NL;	364	encode_nl (enc); --enc->indent; encode_indent (enc);
236		365	}
237	--enc->indent;	366
238	INDENT; encode_ch (enc, ']');	367	encode_ch (enc, ']');
239	}	368	}
240		369
241	static void	370	static void
242	encode_he (enc_t *enc, HE *he)	371	encode_hk (enc_t *enc, HE *he)
243	{	372	{
244	encode_ch (enc, '"');	373	encode_ch (enc, '"');
245		374
246	if (HeKLEN (he) == HEf_SVKEY)	375	if (HeKLEN (he) == HEf_SVKEY)
247	{	376	{
…		…
257	else	386	else
258	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	387	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
259		388
260	encode_ch (enc, '"');	389	encode_ch (enc, '"');
261		390
262	if (enc->flags & F_SPACE_BEFORE) SPACE;	391	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
263	encode_ch (enc, ':');	392	encode_ch (enc, ':');
264	if (enc->flags & F_SPACE_AFTER ) SPACE;	393	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
265	encode_sv (enc, HeVAL (he));
266	}	394	}
267		395
268	// compare hash entries, used when all keys are bytestrings	396	// compare hash entries, used when all keys are bytestrings
269	static int	397	static int
270	he_cmp_fast (const void *a_, const void *b_)	398	he_cmp_fast (const void *a_, const void *b_)
…		…
275	HE *b = *(HE **)b_;	403	HE *b = *(HE **)b_;
276		404
277	STRLEN la = HeKLEN (a);	405	STRLEN la = HeKLEN (a);
278	STRLEN lb = HeKLEN (b);	406	STRLEN lb = HeKLEN (b);
279		407
280	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	408	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
281	cmp = la < lb ? -1 : la == lb ? 0 : 1;	409	cmp = lb - la;
282		410
283	return cmp;	411	return cmp;
284	}	412	}
285		413
286	// compare hash entries, used when some keys are sv's or utf-x	414	// compare hash entries, used when some keys are sv's or utf-x
287	static int	415	static int
288	he_cmp_slow (const void *a, const void *b)	416	he_cmp_slow (const void *a, const void *b)
289	{	417	{
290	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	418	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
291	}	419	}
292		420
293	static void	421	static void
294	encode_hv (enc_t *enc, HV *hv)	422	encode_hv (enc_t *enc, HV *hv)
295	{	423	{
		424	HE *he;
296	int count, i;	425	int count;
297		426
298	encode_ch (enc, '{'); NL; ++enc->indent;	427	if (enc->indent >= enc->maxdepth)
		428	croak ("data structure too deep (hit recursion limit)");
299		429
300	if ((count = hv_iterinit (hv)))	430	encode_ch (enc, '{');
301	{	431
302	// for canonical output we have to sort by keys first	432	// for canonical output we have to sort by keys first
303	// actually, this is mostly due to the stupid so-called	433	// actually, this is mostly due to the stupid so-called
304	// security workaround added somewhere in 5.8.x.	434	// security workaround added somewhere in 5.8.x.
305	// that randomises hash orderings	435	// that randomises hash orderings
306	if (enc->flags & F_CANONICAL)	436	if (enc->json.flags & F_CANONICAL)
		437	{
		438	int count = hv_iterinit (hv);
		439
		440	if (SvMAGICAL (hv))
307	{	441	{
308	HE *he, *hes [count];	442	// need to count by iterating. could improve by dynamically building the vector below
		443	// but I don't care for the speed of this special case.
		444	// note also that we will run into undefined behaviour when the two iterations
		445	// do not result in the same count, something I might care for in some later release.
		446
		447	count = 0;
		448	while (hv_iternext (hv))
		449	++count;
		450
		451	hv_iterinit (hv);
		452	}
		453
		454	if (count)
		455	{
309	int fast = 1;	456	int i, fast = 1;
		457	#if defined(__BORLANDC__) || defined(_MSC_VER)
		458	HE **hes = _alloca (count * sizeof (HE));
		459	#else
		460	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		461	#endif
310		462
311	i = 0;	463	i = 0;
312	while ((he = hv_iternext (hv)))	464	while ((he = hv_iternext (hv)))
313	{	465	{
314	hes [i++] = he;	466	hes [i++] = he;
…		…
336		488
337	FREETMPS;	489	FREETMPS;
338	LEAVE;	490	LEAVE;
339	}	491	}
340		492
341	for (i = 0; i < count; ++i)	493	encode_nl (enc); ++enc->indent;
		494
		495	while (count--)
342	{	496	{
343	INDENT;	497	encode_indent (enc);
		498	he = hes [count];
344	encode_he (enc, hes [i]);	499	encode_hk (enc, he);
		500	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
345		501
346	if (i < count - 1)	502	if (count)
347	COMMA;	503	encode_comma (enc);
348	}	504	}
349		505
		506	encode_nl (enc); --enc->indent; encode_indent (enc);
		507	}
		508	}
		509	else
		510	{
		511	if (hv_iterinit (hv) || SvMAGICAL (hv))
		512	if ((he = hv_iternext (hv)))
350	NL;	513	{
		514	encode_nl (enc); ++enc->indent;
		515
		516	for (;;)
		517	{
		518	encode_indent (enc);
		519	encode_hk (enc, he);
		520	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		521
		522	if (!(he = hv_iternext (hv)))
		523	break;
		524
		525	encode_comma (enc);
		526	}
		527
		528	encode_nl (enc); --enc->indent; encode_indent (enc);
		529	}
		530	}
		531
		532	encode_ch (enc, '}');
		533	}
		534
		535	// encode objects, arrays and special \0=false and \1=true values.
		536	static void
		537	encode_rv (enc_t *enc, SV *sv)
		538	{
		539	svtype svt;
		540
		541	SvGETMAGIC (sv);
		542	svt = SvTYPE (sv);
		543
		544	if (expect_false (SvOBJECT (sv)))
		545	{
		546	HV *stash = !JSON_SLOW || json_boolean_stash
		547	? json_boolean_stash
		548	: gv_stashpv ("JSON::XS::Boolean", 1);
		549
		550	if (SvSTASH (sv) == stash)
		551	{
		552	if (SvIV (sv))
		553	encode_str (enc, "true", 4, 0);
		554	else
		555	encode_str (enc, "false", 5, 0);
351	}	556	}
352	else	557	else
353	{	558	{
354	SV *sv;	559	#if 0
355	HE *he = hv_iternext (hv);	560	if (0 && sv_derived_from (rv, "JSON::Literal"))
356
357	for (;;)
358	{	561	{
359	INDENT;	562	// not yet
360	encode_he (enc, he);
361
362	if (!(he = hv_iternext (hv)))
363	break;
364
365	COMMA;
366	}	563	}
367		564	#endif
		565	if (enc->json.flags & F_CONV_BLESSED)
368	NL;	566	{
		567	// we re-bless the reference to get overload and other niceties right
		568	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		569
		570	if (to_json)
		571	{
		572	dSP;
		573
		574	ENTER; SAVETMPS; PUSHMARK (SP);
		575	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		576
		577	// calling with G_SCALAR ensures that we always get a 1 return value
		578	PUTBACK;
		579	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		580	SPAGAIN;
		581
		582	// catch this surprisingly common error
		583	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		584	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		585
		586	sv = POPs;
		587	PUTBACK;
		588
		589	encode_sv (enc, sv);
		590
		591	FREETMPS; LEAVE;
		592	}
		593	else if (enc->json.flags & F_ALLOW_BLESSED)
		594	encode_str (enc, "null", 4, 0);
		595	else
		596	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		597	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		598	}
		599	else if (enc->json.flags & F_ALLOW_BLESSED)
		600	encode_str (enc, "null", 4, 0);
		601	else
		602	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		603	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
369	}	604	}
370	}	605	}
		606	else if (svt == SVt_PVHV)
		607	encode_hv (enc, (HV *)sv);
		608	else if (svt == SVt_PVAV)
		609	encode_av (enc, (AV *)sv);
		610	else if (svt < SVt_PVAV)
		611	{
		612	STRLEN len = 0;
		613	char *pv = svt ? SvPV (sv, len) : 0;
371		614
372	--enc->indent; INDENT; encode_ch (enc, '}');	615	if (len == 1 && *pv == '1')
		616	encode_str (enc, "true", 4, 0);
		617	else if (len == 1 && *pv == '0')
		618	encode_str (enc, "false", 5, 0);
		619	else
		620	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		621	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		622	}
		623	else
		624	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		625	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
373	}	626	}
374		627
375	static void	628	static void
376	encode_sv (enc_t *enc, SV *sv)	629	encode_sv (enc_t *enc, SV *sv)
377	{	630	{
…		…
385	encode_str (enc, str, len, SvUTF8 (sv));	638	encode_str (enc, str, len, SvUTF8 (sv));
386	encode_ch (enc, '"');	639	encode_ch (enc, '"');
387	}	640	}
388	else if (SvNOKp (sv))	641	else if (SvNOKp (sv))
389	{	642	{
		643	// trust that perl will do the right thing w.r.t. JSON syntax.
390	need (enc, NV_DIG + 32);	644	need (enc, NV_DIG + 32);
391	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	645	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
392	enc->cur += strlen (enc->cur);	646	enc->cur += strlen (enc->cur);
393	}	647	}
394	else if (SvIOKp (sv))	648	else if (SvIOKp (sv))
395	{	649	{
396	need (enc, 64);	650	// we assume we can always read an IV as a UV and vice versa
		651	// we assume two's complement
		652	// we assume no aliasing issues in the union
		653	if (SvIsUV (sv) ? SvUVX (sv) > 59000
		654	: SvIVX (sv) > 59000 || SvIVX (sv) < -59000)
		655	{
		656	// large integer, use the (rather slow) snprintf way.
		657	need (enc, sizeof (UV) * 5 / 2 + 1); // CHAR_BIT is at least 8
397	enc->cur +=	658	enc->cur +=
398	SvIsUV(sv)	659	SvIsUV(sv)
399	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	660	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
400	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	661	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		662	}
		663	else
		664	{
		665	// optimise the "small number case"
		666	// code will likely be branchless and use only a single multiplication
		667	// works for numbers up to 59074
		668	I32 i = SvIVX (sv);
		669	U32 u;
		670	char digit, nz = 0;
		671
		672	need (enc, 6);
		673
		674	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		675	u = i < 0 ? -i : i;
		676
		677	// convert to 4.28 fixed-point representation
		678	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		679
		680	// now output digit by digit, each time masking out the integer part
		681	// and multiplying by 5 while moving the decimal point one to the right,
		682	// resulting in a net multiplication by 10.
		683	// we always write the digit to memory but conditionally increment
		684	// the pointer, to ease the usage of conditional move instructions.
		685	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		686	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		687	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		688	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		689	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		690	}
401	}	691	}
402	else if (SvROK (sv))	692	else if (SvROK (sv))
403	{	693	encode_rv (enc, SvRV (sv));
404	SV *rv = SvRV (sv);
405
406	if (!--enc->max_recurse)
407	croak ("data structure too deep (hit recursion limit)");
408
409	switch (SvTYPE (rv))
410	{
411	case SVt_PVAV: encode_av (enc, (AV *)rv); break;
412	case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
413
414	default:
415	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
416	SvPV_nolen (sv));
417	}
418	}
419	else if (!SvOK (sv))	694	else if (!SvOK (sv))
420	encode_str (enc, "null", 4, 0);	695	encode_str (enc, "null", 4, 0);
421	else	696	else
422	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	697	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
423	SvPV_nolen (sv), SvFLAGS (sv));	698	SvPV_nolen (sv), SvFLAGS (sv));
424	}	699	}
425		700
426	static SV *	701	static SV *
427	encode_json (SV *scalar, UV flags)	702	encode_json (SV *scalar, JSON *json)
428	{	703	{
		704	enc_t enc;
		705
429	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	706	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
430	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	707	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
431		708
432	enc_t enc;	709	enc.json = *json;
433	enc.flags = flags;
434	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	710	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
435	enc.cur = SvPVX (enc.sv);	711	enc.cur = SvPVX (enc.sv);
436	enc.end = SvEND (enc.sv);	712	enc.end = SvEND (enc.sv);
437	enc.max_recurse = 0;
438	enc.indent = 0;	713	enc.indent = 0;
		714	enc.maxdepth = DEC_DEPTH (enc.json.flags);
		715	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		716	: enc.json.flags & F_LATIN1 ? 0x000100UL
		717	: 0x110000UL;
439		718
440	SvPOK_only (enc.sv);	719	SvPOK_only (enc.sv);
441	encode_sv (&enc, scalar);	720	encode_sv (&enc, scalar);
442		721
		722	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		723	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		724
443	if (!(flags & (F_ASCII | F_UTF8)))	725	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
444	SvUTF8_on (enc.sv);	726	SvUTF8_on (enc.sv);
445		727
446	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
447
448	if (enc.flags & F_SHRINK)	728	if (enc.json.flags & F_SHRINK)
449	shrink (enc.sv);	729	shrink (enc.sv);
450		730
451	return enc.sv;	731	return enc.sv;
452	}	732	}
453		733
454	/////////////////////////////////////////////////////////////////////////////	734	/////////////////////////////////////////////////////////////////////////////
		735	// decoder
455		736
456	#define WS \	737	// structure used for decoding JSON
		738	typedef struct
		739	{
		740	char *cur; // current parser pointer
		741	char *end; // end of input string
		742	const char *err; // parse error, if != 0
		743	JSON json;
		744	U32 depth; // recursion depth
		745	U32 maxdepth; // recursion depth limit
		746	} dec_t;
		747
		748	INLINE void
		749	decode_comment (dec_t *dec)
		750	{
		751	// only '#'-style comments allowed a.t.m.
		752
		753	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		754	++dec->cur;
		755	}
		756
		757	INLINE void
		758	decode_ws (dec_t *dec)
		759	{
457	for (;;) \	760	for (;;)
458	{ \	761	{
459	char ch = *dec->cur; \	762	char ch = *dec->cur;
		763
460	if (ch > 0x20 \	764	if (ch > 0x20)
		765	{
		766	if (expect_false (ch == '#'))
		767	{
		768	if (dec->json.flags & F_RELAXED)
		769	decode_comment (dec);
		770	else
		771	break;
		772	}
		773	else
		774	break;
		775	}
461	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	776	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
462	break; \	777	break; // parse error, but let higher level handle it, gives better error messages
		778
463	++dec->cur; \	779	++dec->cur;
464	}	780	}
		781	}
465		782
466	#define ERR(reason) SB dec->err = reason; goto fail; SE	783	#define ERR(reason) SB dec->err = reason; goto fail; SE
		784
467	#define EXPECT_CH(ch) SB \	785	#define EXPECT_CH(ch) SB \
468	if (*dec->cur != ch) \	786	if (*dec->cur != ch) \
469	ERR (# ch " expected"); \	787	ERR (# ch " expected"); \
470	++dec->cur; \	788	++dec->cur; \
471	SE	789	SE
472		790
		791	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		792	#define DEC_DEC_DEPTH --dec->depth
		793
473	static SV *decode_sv (dec_t *dec);	794	static SV *decode_sv (dec_t *dec);
474		795
475	static signed char decode_hexdigit[256];	796	static signed char decode_hexdigit[256];
476		797
477	static UV	798	static UV
478	decode_4hex (dec_t *dec)	799	decode_4hex (dec_t *dec)
479	{	800	{
480	signed char d1, d2, d3, d4;	801	signed char d1, d2, d3, d4;
		802	unsigned char *cur = (unsigned char *)dec->cur;
481		803
482	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	804	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
483	if (d1 < 0) ERR ("four hexadecimal digits expected");	805	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
484	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	806	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
485	if (d2 < 0) ERR ("four hexadecimal digits expected");	807	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
486	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
487	if (d3 < 0) ERR ("four hexadecimal digits expected");
488	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
489	if (d4 < 0) ERR ("four hexadecimal digits expected");
490		808
491	dec->cur += 4;	809	dec->cur += 4;
492		810
493	return ((UV)d1) << 12	811	return ((UV)d1) << 12
494	| ((UV)d2) << 8	812	| ((UV)d2) << 8
…		…
497		815
498	fail:	816	fail:
499	return (UV)-1;	817	return (UV)-1;
500	}	818	}
501		819
502	#define APPEND_GROW(n) SB \
503	if (cur + (n) >= end) \
504	{ \
505	STRLEN ofs = cur - SvPVX (sv); \
506	SvGROW (sv, ofs + (n) + 1); \
507	cur = SvPVX (sv) + ofs; \
508	end = SvEND (sv); \
509	} \
510	SE
511
512	#define APPEND_CH(ch) SB \
513	APPEND_GROW (1); \
514	*cur++ = (ch); \
515	SE
516
517	static SV *	820	static SV *
518	decode_str (dec_t *dec)	821	decode_str (dec_t *dec)
519	{	822	{
520	SV *sv = NEWSV (0,2);	823	SV *sv = 0;
521	int utf8 = 0;	824	int utf8 = 0;
522	char *cur = SvPVX (sv);	825	char *dec_cur = dec->cur;
523	char *end = SvEND (sv);
524		826
525	for (;;)	827	do
526	{	828	{
527	unsigned char ch = *(unsigned char *)dec->cur;	829	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		830	char *cur = buf;
528		831
529	if (ch == '"')	832	do
530	break;
531	else if (ch == '\\')
532	{	833	{
533	switch (*++dec->cur)	834	unsigned char ch = *(unsigned char *)dec_cur++;
		835
		836	if (expect_false (ch == '"'))
534	{	837	{
535	case '\\':	838	--dec_cur;
536	case '/':	839	break;
537	case '"': APPEND_CH (*dec->cur++); break;	840	}
538		841	else if (expect_false (ch == '\\'))
539	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	842	{
540	case 't': APPEND_CH ('\011'); ++dec->cur; break;	843	switch (*dec_cur)
541	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
542	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
543	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
544
545	case 'u':
546	{	844	{
547	UV lo, hi;	845	case '\\':
548	++dec->cur;	846	case '/':
		847	case '"': *cur++ = *dec_cur++; break;
549		848
550	hi = decode_4hex (dec);	849	case 'b': ++dec_cur; *cur++ = '\010'; break;
551	if (hi == (UV)-1)	850	case 't': ++dec_cur; *cur++ = '\011'; break;
552	goto fail;	851	case 'n': ++dec_cur; *cur++ = '\012'; break;
		852	case 'f': ++dec_cur; *cur++ = '\014'; break;
		853	case 'r': ++dec_cur; *cur++ = '\015'; break;
553		854
554	// possibly a surrogate pair	855	case 'u':
555	if (hi >= 0xd800 && hi < 0xdc00)
556	{	856	{
557	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	857	UV lo, hi;
558	ERR ("missing low surrogate character in surrogate pair");	858	++dec_cur;
559		859
560	dec->cur += 2;	860	dec->cur = dec_cur;
561
562	lo = decode_4hex (dec);	861	hi = decode_4hex (dec);
		862	dec_cur = dec->cur;
563	if (lo == (UV)-1)	863	if (hi == (UV)-1)
564	goto fail;	864	goto fail;
565		865
		866	// possibly a surrogate pair
		867	if (hi >= 0xd800)
		868	if (hi < 0xdc00)
		869	{
		870	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		871	ERR ("missing low surrogate character in surrogate pair");
		872
		873	dec_cur += 2;
		874
		875	dec->cur = dec_cur;
		876	lo = decode_4hex (dec);
		877	dec_cur = dec->cur;
		878	if (lo == (UV)-1)
		879	goto fail;
		880
566	if (lo < 0xdc00 || lo >= 0xe000)	881	if (lo < 0xdc00 || lo >= 0xe000)
567	ERR ("surrogate pair expected");	882	ERR ("surrogate pair expected");
568		883
569	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	884	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		885	}
		886	else if (hi < 0xe000)
		887	ERR ("missing high surrogate character in surrogate pair");
		888
		889	if (hi >= 0x80)
		890	{
		891	utf8 = 1;
		892
		893	cur = encode_utf8 (cur, hi);
		894	}
		895	else
		896	*cur++ = hi;
570	}	897	}
571	else if (hi >= 0xdc00 && hi < 0xe000)
572	ERR ("missing high surrogate character in surrogate pair");
573
574	if (hi >= 0x80)
575	{	898	break;
576	utf8 = 1;
577		899
578	APPEND_GROW (4); // at most 4 bytes for 21 bits
579	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
580	}
581	else	900	default:
582	APPEND_CH (hi);	901	--dec_cur;
		902	ERR ("illegal backslash escape sequence in string");
583	}	903	}
584	break;	904	}
		905	else if (expect_true (ch >= 0x20 && ch < 0x80))
		906	*cur++ = ch;
		907	else if (ch >= 0x80)
		908	{
		909	STRLEN clen;
		910	UV uch;
585		911
586	default:
587	--dec->cur;	912	--dec_cur;
588	ERR ("illegal backslash escape sequence in string");	913
		914	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		915	if (clen == (STRLEN)-1)
		916	ERR ("malformed UTF-8 character in JSON string");
		917
		918	do
		919	*cur++ = *dec_cur++;
		920	while (--clen);
		921
		922	utf8 = 1;
		923	}
		924	else
		925	{
		926	--dec_cur;
		927
		928	if (!ch)
		929	ERR ("unexpected end of string while parsing JSON string");
		930	else
		931	ERR ("invalid character encountered while parsing JSON string");
589	}	932	}
590	}	933	}
591	else if (ch >= 0x20 && ch <= 0x7f)	934	while (cur < buf + SHORT_STRING_LEN);
592	APPEND_CH (*dec->cur++);	935
593	else if (ch >= 0x80)
594	{	936	{
595	STRLEN clen;	937	STRLEN len = cur - buf;
596	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
597	if (clen == (STRLEN)-1)
598	ERR ("malformed UTF-8 character in JSON string");
599		938
600	APPEND_GROW (clen);	939	if (sv)
601	do
602	{	940	{
603	*cur++ = *dec->cur++;	941	SvGROW (sv, SvCUR (sv) + len + 1);
		942	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		943	SvCUR_set (sv, SvCUR (sv) + len);
604	}	944	}
605	while (--clen);
606
607	utf8 = 1;
608	}
609	else if (dec->cur == dec->end)
610	ERR ("unexpected end of string while parsing json string");
611	else	945	else
612	ERR ("invalid character encountered");	946	sv = newSVpvn (buf, len);
613	}	947	}
		948	}
		949	while (*dec_cur != '"');
614		950
615	++dec->cur;	951	++dec_cur;
616		952
617	SvCUR_set (sv, cur - SvPVX (sv));	953	if (sv)
618		954	{
619	SvPOK_only (sv);	955	SvPOK_only (sv);
620	*SvEND (sv) = 0;	956	*SvEND (sv) = 0;
621		957
622	if (utf8)	958	if (utf8)
623	SvUTF8_on (sv);	959	SvUTF8_on (sv);
		960	}
		961	else
		962	sv = newSVpvn ("", 0);
624		963
625	if (dec->flags & F_SHRINK)	964	dec->cur = dec_cur;
626	shrink (sv);
627
628	return sv;	965	return sv;
629		966
630	fail:	967	fail:
631	SvREFCNT_dec (sv);	968	dec->cur = dec_cur;
632	return 0;	969	return 0;
633	}	970	}
634		971
635	static SV *	972	static SV *
636	decode_num (dec_t *dec)	973	decode_num (dec_t *dec)
…		…
694	is_nv = 1;	1031	is_nv = 1;
695	}	1032	}
696		1033
697	if (!is_nv)	1034	if (!is_nv)
698	{	1035	{
699	UV uv;	1036	int len = dec->cur - start;
700	int numtype = grok_number (start, dec->cur - start, &uv);	1037
701	if (numtype & IS_NUMBER_IN_UV)	1038	// special case the rather common 1..5-digit-int case
702	if (numtype & IS_NUMBER_NEG)	1039	if (*start == '-')
		1040	switch (len)
703	{	1041	{
704	if (uv < (UV)IV_MIN)	1042	case 2: return newSViv (-( start [1] - '0' * 1));
705	return newSViv (-(IV)uv);	1043	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		1044	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1045	case 5: return newSViv (-( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1046	case 6: return newSViv (-(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
706	}	1047	}
		1048	else
		1049	switch (len)
		1050	{
		1051	case 1: return newSViv ( start [0] - '0' * 1);
		1052	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1053	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1054	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1055	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1056	}
		1057
		1058	{
		1059	UV uv;
		1060	int numtype = grok_number (start, len, &uv);
		1061	if (numtype & IS_NUMBER_IN_UV)
		1062	if (numtype & IS_NUMBER_NEG)
		1063	{
		1064	if (uv < (UV)IV_MIN)
		1065	return newSViv (-(IV)uv);
		1066	}
707	else	1067	else
708	return newSVuv (uv);	1068	return newSVuv (uv);
709	}	1069	}
710		1070
		1071	len -= *start == '-' ? 1 : 0;
		1072
		1073	// does not fit into IV or UV, try NV
		1074	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1075	#if defined (LDBL_DIG)
		1076	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1077	#endif
		1078	)
		1079	// fits into NV without loss of precision
		1080	return newSVnv (Atof (start));
		1081
		1082	// everything else fails, convert it to a string
		1083	return newSVpvn (start, dec->cur - start);
		1084	}
		1085
		1086	// loss of precision here
711	return newSVnv (Atof (start));	1087	return newSVnv (Atof (start));
712		1088
713	fail:	1089	fail:
714	return 0;	1090	return 0;
715	}	1091	}
…		…
717	static SV *	1093	static SV *
718	decode_av (dec_t *dec)	1094	decode_av (dec_t *dec)
719	{	1095	{
720	AV *av = newAV ();	1096	AV *av = newAV ();
721		1097
722	WS;	1098	DEC_INC_DEPTH;
		1099	decode_ws (dec);
		1100
723	if (*dec->cur == ']')	1101	if (*dec->cur == ']')
724	++dec->cur;	1102	++dec->cur;
725	else	1103	else
726	for (;;)	1104	for (;;)
727	{	1105	{
…		…
731	if (!value)	1109	if (!value)
732	goto fail;	1110	goto fail;
733		1111
734	av_push (av, value);	1112	av_push (av, value);
735		1113
736	WS;	1114	decode_ws (dec);
737		1115
738	if (*dec->cur == ']')	1116	if (*dec->cur == ']')
739	{	1117	{
740	++dec->cur;	1118	++dec->cur;
741	break;	1119	break;
…		…
743		1121
744	if (*dec->cur != ',')	1122	if (*dec->cur != ',')
745	ERR (", or ] expected while parsing array");	1123	ERR (", or ] expected while parsing array");
746		1124
747	++dec->cur;	1125	++dec->cur;
		1126
		1127	decode_ws (dec);
		1128
		1129	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1130	{
		1131	++dec->cur;
		1132	break;
		1133	}
748	}	1134	}
749		1135
		1136	DEC_DEC_DEPTH;
750	return newRV_noinc ((SV *)av);	1137	return newRV_noinc ((SV *)av);
751		1138
752	fail:	1139	fail:
753	SvREFCNT_dec (av);	1140	SvREFCNT_dec (av);
		1141	DEC_DEC_DEPTH;
754	return 0;	1142	return 0;
755	}	1143	}
756		1144
757	static SV *	1145	static SV *
758	decode_hv (dec_t *dec)	1146	decode_hv (dec_t *dec)
759	{	1147	{
		1148	SV *sv;
760	HV *hv = newHV ();	1149	HV *hv = newHV ();
761		1150
762	WS;	1151	DEC_INC_DEPTH;
		1152	decode_ws (dec);
		1153
763	if (*dec->cur == '}')	1154	if (*dec->cur == '}')
764	++dec->cur;	1155	++dec->cur;
765	else	1156	else
766	for (;;)	1157	for (;;)
767	{	1158	{
768	SV *key, *value;
769
770	WS; EXPECT_CH ('"');	1159	EXPECT_CH ('"');
771		1160
772	key = decode_str (dec);	1161	// heuristic: assume that
773	if (!key)	1162	// a) decode_str + hv_store_ent are abysmally slow.
774	goto fail;	1163	// b) most hash keys are short, simple ascii text.
		1164	// => try to "fast-match" such strings to avoid
		1165	// the overhead of decode_str + hv_store_ent.
		1166	{
		1167	SV *value;
		1168	char *p = dec->cur;
		1169	char *e = p + 24; // only try up to 24 bytes
775		1170
776	WS; EXPECT_CH (':');	1171	for (;;)
777
778	value = decode_sv (dec);
779	if (!value)
780	{	1172	{
		1173	// the >= 0x80 is true on most architectures
		1174	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1175	{
		1176	// slow path, back up and use decode_str
		1177	SV *key = decode_str (dec);
		1178	if (!key)
		1179	goto fail;
		1180
		1181	decode_ws (dec); EXPECT_CH (':');
		1182
		1183	decode_ws (dec);
		1184	value = decode_sv (dec);
		1185	if (!value)
		1186	{
		1187	SvREFCNT_dec (key);
		1188	goto fail;
		1189	}
		1190
		1191	hv_store_ent (hv, key, value, 0);
781	SvREFCNT_dec (key);	1192	SvREFCNT_dec (key);
		1193
		1194	break;
		1195	}
		1196	else if (*p == '"')
		1197	{
		1198	// fast path, got a simple key
		1199	char *key = dec->cur;
		1200	int len = p - key;
		1201	dec->cur = p + 1;
		1202
		1203	decode_ws (dec); EXPECT_CH (':');
		1204
		1205	decode_ws (dec);
		1206	value = decode_sv (dec);
		1207	if (!value)
782	goto fail;	1208	goto fail;
		1209
		1210	hv_store (hv, key, len, value, 0);
		1211
		1212	break;
		1213	}
		1214
		1215	++p;
783	}	1216	}
784
785	//TODO: optimise
786	hv_store_ent (hv, key, value, 0);
787
788	WS;	1217	}
		1218
		1219	decode_ws (dec);
789		1220
790	if (*dec->cur == '}')	1221	if (*dec->cur == '}')
791	{	1222	{
792	++dec->cur;	1223	++dec->cur;
793	break;	1224	break;
…		…
795		1226
796	if (*dec->cur != ',')	1227	if (*dec->cur != ',')
797	ERR (", or } expected while parsing object/hash");	1228	ERR (", or } expected while parsing object/hash");
798		1229
799	++dec->cur;	1230	++dec->cur;
		1231
		1232	decode_ws (dec);
		1233
		1234	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1235	{
		1236	++dec->cur;
		1237	break;
		1238	}
800	}	1239	}
801		1240
		1241	DEC_DEC_DEPTH;
802	return newRV_noinc ((SV *)hv);	1242	sv = newRV_noinc ((SV *)hv);
		1243
		1244	// check filter callbacks
		1245	if (dec->json.flags & F_HOOK)
		1246	{
		1247	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1248	{
		1249	HE *cb, *he;
		1250
		1251	hv_iterinit (hv);
		1252	he = hv_iternext (hv);
		1253	hv_iterinit (hv);
		1254
		1255	// the next line creates a mortal sv each time its called.
		1256	// might want to optimise this for common cases.
		1257	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1258
		1259	if (cb)
		1260	{
		1261	dSP;
		1262	int count;
		1263
		1264	ENTER; SAVETMPS; PUSHMARK (SP);
		1265	XPUSHs (HeVAL (he));
		1266
		1267	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1268
		1269	if (count == 1)
		1270	{
		1271	sv = newSVsv (POPs);
		1272	FREETMPS; LEAVE;
		1273	return sv;
		1274	}
		1275
		1276	FREETMPS; LEAVE;
		1277	}
		1278	}
		1279
		1280	if (dec->json.cb_object)
		1281	{
		1282	dSP;
		1283	int count;
		1284
		1285	ENTER; SAVETMPS; PUSHMARK (SP);
		1286	XPUSHs (sv_2mortal (sv));
		1287
		1288	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1289
		1290	if (count == 1)
		1291	{
		1292	sv = newSVsv (POPs);
		1293	FREETMPS; LEAVE;
		1294	return sv;
		1295	}
		1296
		1297	SvREFCNT_inc (sv);
		1298	FREETMPS; LEAVE;
		1299	}
		1300	}
		1301
		1302	return sv;
803		1303
804	fail:	1304	fail:
805	SvREFCNT_dec (hv);	1305	SvREFCNT_dec (hv);
		1306	DEC_DEC_DEPTH;
806	return 0;	1307	return 0;
807	}	1308	}
808		1309
809	static SV *	1310	static SV *
810	decode_sv (dec_t *dec)	1311	decode_sv (dec_t *dec)
811	{	1312	{
812	WS;	1313	// the beauty of JSON: you need exactly one character lookahead
		1314	// to parse everything.
813	switch (*dec->cur)	1315	switch (*dec->cur)
814	{	1316	{
815	case '"': ++dec->cur; return decode_str (dec);	1317	case '"': ++dec->cur; return decode_str (dec);
816	case '[': ++dec->cur; return decode_av (dec);	1318	case '[': ++dec->cur; return decode_av (dec);
817	case '{': ++dec->cur; return decode_hv (dec);	1319	case '{': ++dec->cur; return decode_hv (dec);
818		1320
819	case '-':	1321	case '-':
820	case '0': case '1': case '2': case '3': case '4':	1322	case '0': case '1': case '2': case '3': case '4':
821	case '5': case '6': case '7': case '8': case '9':	1323	case '5': case '6': case '7': case '8': case '9':
822	return decode_num (dec);	1324	return decode_num (dec);
823		1325
824	case 't':	1326	case 't':
825	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1327	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
826	{	1328	{
827	dec->cur += 4;	1329	dec->cur += 4;
828	return newSViv (1);	1330	#if JSON_SLOW
		1331	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1332	#endif
		1333	return SvREFCNT_inc (json_true);
829	}	1334	}
830	else	1335	else
831	ERR ("'true' expected");	1336	ERR ("'true' expected");
832		1337
833	break;	1338	break;
834		1339
835	case 'f':	1340	case 'f':
836	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1341	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
837	{	1342	{
838	dec->cur += 5;	1343	dec->cur += 5;
839	return newSViv (0);	1344	#if JSON_SLOW
		1345	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1346	#endif
		1347	return SvREFCNT_inc (json_false);
840	}	1348	}
841	else	1349	else
842	ERR ("'false' expected");	1350	ERR ("'false' expected");
843		1351
844	break;	1352	break;
…		…
853	ERR ("'null' expected");	1361	ERR ("'null' expected");
854		1362
855	break;	1363	break;
856		1364
857	default:	1365	default:
858	ERR ("malformed json string, neither array, object, number, string or atom");	1366	ERR ("malformed JSON string, neither array, object, number, string or atom");
859	break;	1367	break;
860	}	1368	}
861		1369
862	fail:	1370	fail:
863	return 0;	1371	return 0;
864	}	1372	}
865		1373
866	static SV *	1374	static SV *
867	decode_json (SV *string, UV flags)	1375	decode_json (SV *string, JSON *json, UV *offset_return)
868	{	1376	{
		1377	dec_t dec;
		1378	UV offset;
869	SV *sv;	1379	SV *sv;
870		1380
		1381	SvGETMAGIC (string);
		1382	SvUPGRADE (string, SVt_PV);
		1383
		1384	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1385	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1386	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1387
871	if (flags & F_UTF8)	1388	if (json->flags & F_UTF8)
872	sv_utf8_downgrade (string, 0);	1389	sv_utf8_downgrade (string, 0);
873	else	1390	else
874	sv_utf8_upgrade (string);	1391	sv_utf8_upgrade (string);
875		1392
876	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1393	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
877		1394
878	dec_t dec;	1395	dec.json = *json;
879	dec.flags = flags;
880	dec.cur = SvPVX (string);	1396	dec.cur = SvPVX (string);
881	dec.end = SvEND (string);	1397	dec.end = SvEND (string);
882	dec.err = 0;	1398	dec.err = 0;
		1399	dec.depth = 0;
		1400	dec.maxdepth = DEC_DEPTH (dec.json.flags);
883		1401
		1402	if (dec.json.cb_object || dec.json.cb_sk_object)
		1403	dec.json.flags |= F_HOOK;
		1404
		1405	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1406
		1407	decode_ws (&dec);
884	sv = decode_sv (&dec);	1408	sv = decode_sv (&dec);
885		1409
		1410	if (!(offset_return || !sv))
		1411	{
		1412	// check for trailing garbage
		1413	decode_ws (&dec);
		1414
		1415	if (*dec.cur)
		1416	{
		1417	dec.err = "garbage after JSON object";
		1418	SvREFCNT_dec (sv);
		1419	sv = 0;
		1420	}
		1421	}
		1422
		1423	if (offset_return || !sv)
		1424	{
		1425	offset = dec.json.flags & F_UTF8
		1426	? dec.cur - SvPVX (string)
		1427	: utf8_distance (dec.cur, SvPVX (string));
		1428
		1429	if (offset_return)
		1430	*offset_return = offset;
		1431	}
		1432
886	if (!sv)	1433	if (!sv)
887	{	1434	{
888	IV offset = dec.flags & F_UTF8
889	? dec.cur - SvPVX (string)
890	: utf8_distance (dec.cur, SvPVX (string));
891	SV *uni = sv_newmortal ();	1435	SV *uni = sv_newmortal ();
892		1436
893	// horrible hack to silence warning inside pv_uni_display	1437	// horrible hack to silence warning inside pv_uni_display
894	COP cop = *PL_curcop;	1438	COP cop = *PL_curcop;
895	cop.cop_warnings = pWARN_NONE;	1439	cop.cop_warnings = pWARN_NONE;
…		…
897	SAVEVPTR (PL_curcop);	1441	SAVEVPTR (PL_curcop);
898	PL_curcop = &cop;	1442	PL_curcop = &cop;
899	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1443	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
900	LEAVE;	1444	LEAVE;
901		1445
902	croak ("%s, at character offset %d (%s)",	1446	croak ("%s, at character offset %d [\"%s\"]",
903	dec.err,	1447	dec.err,
904	(int)offset,	1448	(int)offset,
905	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1449	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
906	}	1450	}
907		1451
908	sv = sv_2mortal (sv);	1452	sv = sv_2mortal (sv);
909		1453
910	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1454	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
911	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1455	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
912		1456
913	return sv;	1457	return sv;
914	}	1458	}
915		1459
		1460	/////////////////////////////////////////////////////////////////////////////
		1461	// XS interface functions
		1462
916	MODULE = JSON::XS PACKAGE = JSON::XS	1463	MODULE = JSON::XS PACKAGE = JSON::XS
917		1464
918	BOOT:	1465	BOOT:
919	{	1466	{
920	int i;	1467	int i;
921		1468
922	memset (decode_hexdigit, 0xff, 256);
923	for (i = 10; i--; )	1469	for (i = 0; i < 256; ++i)
924	decode_hexdigit ['0' + i] = i;	1470	decode_hexdigit [i] =
		1471	i >= '0' && i <= '9' ? i - '0'
		1472	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1473	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1474	: -1;
925		1475
926	for (i = 7; i--; )
927	{
928	decode_hexdigit ['a' + i] = 10 + i;
929	decode_hexdigit ['A' + i] = 10 + i;
930	}
931
932	json_stash = gv_stashpv ("JSON::XS", 1);	1476	json_stash = gv_stashpv ("JSON::XS" , 1);
		1477	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1478
		1479	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1480	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
933	}	1481	}
934		1482
935	PROTOTYPES: DISABLE	1483	PROTOTYPES: DISABLE
936		1484
937	SV *new (char *dummy)	1485	void CLONE (...)
938	CODE:	1486	CODE:
939	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1487	json_stash = 0;
		1488	json_boolean_stash = 0;
		1489
		1490	void new (char *klass)
		1491	PPCODE:
		1492	{
		1493	SV *pv = NEWSV (0, sizeof (JSON));
		1494	SvPOK_only (pv);
		1495	Zero (SvPVX (pv), 1, JSON);
		1496	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1497	XPUSHs (sv_2mortal (sv_bless (
		1498	newRV_noinc (pv),
		1499	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1500	)));
		1501	}
		1502
		1503	void ascii (JSON *self, int enable = 1)
		1504	ALIAS:
		1505	ascii = F_ASCII
		1506	latin1 = F_LATIN1
		1507	utf8 = F_UTF8
		1508	indent = F_INDENT
		1509	canonical = F_CANONICAL
		1510	space_before = F_SPACE_BEFORE
		1511	space_after = F_SPACE_AFTER
		1512	pretty = F_PRETTY
		1513	allow_nonref = F_ALLOW_NONREF
		1514	shrink = F_SHRINK
		1515	allow_blessed = F_ALLOW_BLESSED
		1516	convert_blessed = F_CONV_BLESSED
		1517	relaxed = F_RELAXED
		1518	PPCODE:
		1519	{
		1520	if (enable)
		1521	self->flags |= ix;
		1522	else
		1523	self->flags &= ~ix;
		1524
		1525	XPUSHs (ST (0));
		1526	}
		1527
		1528	void get_ascii (JSON *self)
		1529	ALIAS:
		1530	get_ascii = F_ASCII
		1531	get_latin1 = F_LATIN1
		1532	get_utf8 = F_UTF8
		1533	get_indent = F_INDENT
		1534	get_canonical = F_CANONICAL
		1535	get_space_before = F_SPACE_BEFORE
		1536	get_space_after = F_SPACE_AFTER
		1537	get_allow_nonref = F_ALLOW_NONREF
		1538	get_shrink = F_SHRINK
		1539	get_allow_blessed = F_ALLOW_BLESSED
		1540	get_convert_blessed = F_CONV_BLESSED
		1541	get_relaxed = F_RELAXED
		1542	PPCODE:
		1543	XPUSHs (boolSV (self->flags & ix));
		1544
		1545	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1546	PPCODE:
		1547	{
		1548	UV log2 = 0;
		1549
		1550	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1551
		1552	while ((1UL << log2) < max_depth)
		1553	++log2;
		1554
		1555	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1556
		1557	XPUSHs (ST (0));
		1558	}
		1559
		1560	U32 get_max_depth (JSON *self)
		1561	CODE:
		1562	RETVAL = DEC_DEPTH (self->flags);
940	OUTPUT:	1563	OUTPUT:
941	RETVAL	1564	RETVAL
942		1565
943	SV *ascii (SV *self, int enable = 1)	1566	void max_size (JSON *self, UV max_size = 0)
944	ALIAS:	1567	PPCODE:
945	ascii = F_ASCII	1568	{
946	utf8 = F_UTF8	1569	UV log2 = 0;
947	indent = F_INDENT	1570
948	canonical = F_CANONICAL	1571	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
949	space_before = F_SPACE_BEFORE	1572	if (max_size == 1) max_size = 2;
950	space_after = F_SPACE_AFTER	1573
951	json_rpc = F_JSON_RPC	1574	while ((1UL << log2) < max_size)
952	pretty = F_PRETTY	1575	++log2;
953	allow_nonref = F_ALLOW_NONREF	1576
954	shrink = F_SHRINK	1577	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1578
		1579	XPUSHs (ST (0));
		1580	}
		1581
		1582	int get_max_size (JSON *self)
955	CODE:	1583	CODE:
956	{	1584	RETVAL = DEC_SIZE (self->flags);
957	UV *uv = SvJSON (self);
958	if (enable)
959	*uv |= ix;
960	else
961	*uv &= ~ix;
962
963	RETVAL = newSVsv (self);
964	}
965	OUTPUT:	1585	OUTPUT:
966	RETVAL	1586	RETVAL
967		1587
968	void encode (SV *self, SV *scalar)	1588	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
969	PPCODE:	1589	PPCODE:
970	XPUSHs (encode_json (scalar, *SvJSON (self)));	1590	{
		1591	SvREFCNT_dec (self->cb_object);
		1592	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
971		1593
972	void decode (SV *self, SV *jsonstr)	1594	XPUSHs (ST (0));
		1595	}
		1596
		1597	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
973	PPCODE:	1598	PPCODE:
		1599	{
		1600	if (!self->cb_sk_object)
		1601	self->cb_sk_object = newHV ();
		1602
		1603	if (SvOK (cb))
		1604	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1605	else
		1606	{
		1607	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1608
		1609	if (!HvKEYS (self->cb_sk_object))
		1610	{
		1611	SvREFCNT_dec (self->cb_sk_object);
		1612	self->cb_sk_object = 0;
		1613	}
		1614	}
		1615
		1616	XPUSHs (ST (0));
		1617	}
		1618
		1619	void encode (JSON *self, SV *scalar)
		1620	PPCODE:
		1621	XPUSHs (encode_json (scalar, self));
		1622
		1623	void decode (JSON *self, SV *jsonstr)
		1624	PPCODE:
974	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1625	XPUSHs (decode_json (jsonstr, self, 0));
		1626
		1627	void decode_prefix (JSON *self, SV *jsonstr)
		1628	PPCODE:
		1629	{
		1630	UV offset;
		1631	EXTEND (SP, 2);
		1632	PUSHs (decode_json (jsonstr, self, &offset));
		1633	PUSHs (sv_2mortal (newSVuv (offset)));
		1634	}
		1635
		1636	void DESTROY (JSON *self)
		1637	CODE:
		1638	SvREFCNT_dec (self->cb_sk_object);
		1639	SvREFCNT_dec (self->cb_object);
975		1640
976	PROTOTYPES: ENABLE	1641	PROTOTYPES: ENABLE
977		1642
978	void to_json (SV *scalar)	1643	void encode_json (SV *scalar)
979	PPCODE:	1644	PPCODE:
		1645	{
		1646	JSON json = { F_DEFAULT | F_UTF8 };
980	XPUSHs (encode_json (scalar, F_UTF8));	1647	XPUSHs (encode_json (scalar, &json));
		1648	}
981		1649
982	void from_json (SV *jsonstr)	1650	void decode_json (SV *jsonstr)
983	PPCODE:	1651	PPCODE:
		1652	{
		1653	JSON json = { F_DEFAULT | F_UTF8 };
984	XPUSHs (decode_json (jsonstr, F_UTF8));	1654	XPUSHs (decode_json (jsonstr, &json, 0));
		1655	}
985		1656

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