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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 1.49 by root, Sun Jul 1 23:40:07 2007 UTC

…		…
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include "assert.h"
6	#include "string.h"	6	#include "string.h"
7	#include "stdlib.h"	7	#include "stdlib.h"
		8	#include "stdio.h"
8		9
		10	#if defined(__BORLANDC__) || defined(_MSC_VER)
		11	# define snprintf _snprintf // C compilers have this in stdio.h
		12	#endif
		13
		14	// some old perls do not have this, try to make it work, no
		15	// guarentees, though. if it breaks, you get to keep the pieces.
		16	#ifndef UTF8_MAXBYTES
		17	# define UTF8_MAXBYTES 13
		18	#endif
		19
9	#define F_ASCII 0x00000001	20	#define F_ASCII 0x00000001UL
		21	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	22	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	23	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	24	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	25	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	26	#define F_SPACE_AFTER 0x00000040UL
15	#define F_JSON_RPC 0x00000040
16	#define F_ALLOW_NONREF 0x00000080	27	#define F_ALLOW_NONREF 0x00000100UL
17	#define F_SHRINK 0x00000100	28	#define F_SHRINK 0x00000200UL
		29	#define F_ALLOW_BLESSED 0x00000400UL
		30	#define F_CONV_BLESSED 0x00000800UL
		31	#define F_MAXDEPTH 0xf8000000UL
		32	#define S_MAXDEPTH 27
		33	#define F_MAXSIZE 0x01f00000UL
		34	#define S_MAXSIZE 20
		35	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		36
		37	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		38	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
18		39
19	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	40	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20	#define F_DEFAULT 0	41	#define F_DEFAULT (9UL << S_MAXDEPTH)
21		42
22	#define INIT_SIZE 32 // initial scalar size to be allocated	43	#define INIT_SIZE 32 // initial scalar size to be allocated
		44	#define INDENT_STEP 3 // spaces per indentation level
		45
		46	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23		47
24	#define SB do {	48	#define SB do {
25	#define SE } while (0)	49	#define SE } while (0)
26		50
27	static HV *json_stash;	51	#if __GNUC__ >= 3
		52	# define expect(expr,value) __builtin_expect ((expr),(value))
		53	# define inline inline
		54	#else
		55	# define expect(expr,value) (expr)
		56	# define inline static
		57	#endif
		58
		59	#define expect_false(expr) expect ((expr) != 0, 0)
		60	#define expect_true(expr) expect ((expr) != 0, 1)
		61
		62	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		63	static SV *json_true, *json_false;
		64
		65	typedef struct {
		66	U32 flags;
		67	SV *cb_object, *cb_sk_object;
		68	} JSON;
		69
		70	/////////////////////////////////////////////////////////////////////////////
		71	// utility functions
		72
		73	inline void
		74	shrink (SV *sv)
		75	{
		76	sv_utf8_downgrade (sv, 1);
		77	if (SvLEN (sv) > SvCUR (sv) + 1)
		78	{
		79	#ifdef SvPV_shrink_to_cur
		80	SvPV_shrink_to_cur (sv);
		81	#elif defined (SvPV_renew)
		82	SvPV_renew (sv, SvCUR (sv) + 1);
		83	#endif
		84	}
		85	}
		86
		87	// decode an utf-8 character and return it, or (UV)-1 in
		88	// case of an error.
		89	// we special-case "safe" characters from U+80 .. U+7FF,
		90	// but use the very good perl function to parse anything else.
		91	// note that we never call this function for a ascii codepoints
		92	inline UV
		93	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		94	{
		95	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		96	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		97	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		98	{
		99	*clen = 2;
		100	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		101	}
		102	else
		103	{
		104	*clen = (STRLEN)-1;
		105	return (UV)-1;
		106	}
		107	}
		108
		109	/////////////////////////////////////////////////////////////////////////////
		110	// encoder
28		111
29	// structure used for encoding JSON	112	// structure used for encoding JSON
30	typedef struct	113	typedef struct
31	{	114	{
32	char *cur;	115	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	116	char *end; // SvEND (sv)
35	SV *sv;	117	SV *sv; // result scalar
36	UV flags;	118	JSON json;
37	int max_recurse;	119	U32 indent; // indentation level
38	int indent;	120	U32 maxdepth; // max. indentation/recursion level
39	} enc_t;	121	} enc_t;
40		122
41	// structure used for decoding JSON	123	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)	124	need (enc_t *enc, STRLEN len)
72	{	125	{
73	if (enc->cur + len >= enc->end)	126	if (expect_false (enc->cur + len >= enc->end))
74	{	127	{
75	STRLEN cur = enc->cur - SvPVX (enc->sv);	128	STRLEN cur = enc->cur - SvPVX (enc->sv);
76	SvGROW (enc->sv, cur + len + 1);	129	SvGROW (enc->sv, cur + len + 1);
77	enc->cur = SvPVX (enc->sv) + cur;	130	enc->cur = SvPVX (enc->sv) + cur;
78	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	131	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79	}	132	}
80	}	133	}
81		134
82	static void	135	inline void
83	encode_ch (enc_t *enc, char ch)	136	encode_ch (enc_t *enc, char ch)
84	{	137	{
85	need (enc, 1);	138	need (enc, 1);
86	*enc->cur++ = ch;	139	*enc->cur++ = ch;
87	}	140	}
…		…
95		148
96	while (str < end)	149	while (str < end)
97	{	150	{
98	unsigned char ch = *(unsigned char *)str;	151	unsigned char ch = *(unsigned char *)str;
99		152
100	if (ch >= 0x20 && ch < 0x80) // most common case	153	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101	{	154	{
102	if (ch == '"') // but with slow exceptions	155	if (expect_false (ch == '"')) // but with slow exceptions
103	{	156	{
104	need (enc, len += 1);	157	need (enc, len += 1);
105	*enc->cur++ = '\\';	158	*enc->cur++ = '\\';
106	*enc->cur++ = '"';	159	*enc->cur++ = '"';
107	}	160	}
108	else if (ch == '\\')	161	else if (expect_false (ch == '\\'))
109	{	162	{
110	need (enc, len += 1);	163	need (enc, len += 1);
111	*enc->cur++ = '\\';	164	*enc->cur++ = '\\';
112	*enc->cur++ = '\\';	165	*enc->cur++ = '\\';
113	}	166	}
…		…
131	STRLEN clen;	184	STRLEN clen;
132	UV uch;	185	UV uch;
133		186
134	if (is_utf8)	187	if (is_utf8)
135	{	188	{
136	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	189	uch = decode_utf8 (str, end - str, &clen);
137	if (clen == (STRLEN)-1)	190	if (clen == (STRLEN)-1)
138	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	191	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139	}	192	}
140	else	193	else
141	{	194	{
…		…
144	}	197	}
145		198
146	if (uch > 0x10FFFFUL)	199	if (uch > 0x10FFFFUL)
147	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);	200	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
148		201
149	if (uch < 0x80 || enc->flags & F_ASCII)	202	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
150	{	203	{
151	if (uch > 0xFFFFUL)	204	if (uch > 0xFFFFUL)
152	{	205	{
153	need (enc, len += 11);	206	need (enc, len += 11);
154	sprintf (enc->cur, "\\u%04x\\u%04x",	207	sprintf (enc->cur, "\\u%04x\\u%04x",
155	(uch - 0x10000) / 0x400 + 0xD800,	208	(int)((uch - 0x10000) / 0x400 + 0xD800),
156	(uch - 0x10000) % 0x400 + 0xDC00);	209	(int)((uch - 0x10000) % 0x400 + 0xDC00));
157	enc->cur += 12;	210	enc->cur += 12;
158	}	211	}
159	else	212	else
160	{	213	{
161	static char hexdigit [16] = "0123456789abcdef";	214	static char hexdigit [16] = "0123456789abcdef";
…		…
168	*enc->cur++ = hexdigit [(uch >> 0) & 15];	221	*enc->cur++ = hexdigit [(uch >> 0) & 15];
169	}	222	}
170		223
171	str += clen;	224	str += clen;
172	}	225	}
		226	else if (enc->json.flags & F_LATIN1)
		227	{
		228	*enc->cur++ = uch;
		229	str += clen;
		230	}
173	else if (is_utf8)	231	else if (is_utf8)
174	{	232	{
175	need (enc, len += clen);	233	need (enc, len += clen);
176	do	234	do
177	{	235	{
…		…
179	}	237	}
180	while (--clen);	238	while (--clen);
181	}	239	}
182	else	240	else
183	{	241	{
184	need (enc, len += 10); // never more than 11 bytes needed	242	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
185	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	243	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
186	++str;	244	++str;
187	}	245	}
188	}	246	}
189	}	247	}
…		…
191		249
192	--len;	250	--len;
193	}	251	}
194	}	252	}
195		253
196	#define INDENT SB \	254	inline void
		255	encode_indent (enc_t *enc)
		256	{
197	if (enc->flags & F_INDENT) \	257	if (enc->json.flags & F_INDENT)
198	{ \	258	{
199	int i_; \	259	int spaces = enc->indent * INDENT_STEP;
200	need (enc, enc->indent); \	260
201	for (i_ = enc->indent * 3; i_--; )\	261	need (enc, spaces);
		262	memset (enc->cur, ' ', spaces);
		263	enc->cur += spaces;
		264	}
		265	}
		266
		267	inline void
		268	encode_space (enc_t *enc)
		269	{
		270	need (enc, 1);
		271	encode_ch (enc, ' ');
		272	}
		273
		274	inline void
		275	encode_nl (enc_t *enc)
		276	{
		277	if (enc->json.flags & F_INDENT)
		278	{
		279	need (enc, 1);
202	encode_ch (enc, ' '); \	280	encode_ch (enc, '\n');
203	} \	281	}
204	SE	282	}
205		283
206	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	284	inline void
207	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	285	encode_comma (enc_t *enc)
208	#define COMMA SB \	286	{
209	encode_ch (enc, ','); \	287	encode_ch (enc, ',');
		288
210	if (enc->flags & F_INDENT) \	289	if (enc->json.flags & F_INDENT)
211	NL; \	290	encode_nl (enc);
212	else if (enc->flags & F_SPACE_AFTER) \	291	else if (enc->json.flags & F_SPACE_AFTER)
213	SPACE; \	292	encode_space (enc);
214	SE	293	}
215		294
216	static void encode_sv (enc_t *enc, SV *sv);	295	static void encode_sv (enc_t *enc, SV *sv);
217		296
218	static void	297	static void
219	encode_av (enc_t *enc, AV *av)	298	encode_av (enc_t *enc, AV *av)
220	{	299	{
221	int i, len = av_len (av);	300	int i, len = av_len (av);
222		301
223	encode_ch (enc, '['); NL;	302	if (enc->indent >= enc->maxdepth)
		303	croak ("data structure too deep (hit recursion limit)");
		304
		305	encode_ch (enc, '['); encode_nl (enc);
224	++enc->indent;	306	++enc->indent;
225		307
226	for (i = 0; i <= len; ++i)	308	for (i = 0; i <= len; ++i)
227	{	309	{
228	INDENT;	310	encode_indent (enc);
229	encode_sv (enc, *av_fetch (av, i, 0));	311	encode_sv (enc, *av_fetch (av, i, 0));
230		312
231	if (i < len)	313	if (i < len)
232	COMMA;	314	encode_comma (enc);
233	}	315	}
234		316
235	NL;	317	encode_nl (enc);
236		318
237	--enc->indent;	319	--enc->indent;
238	INDENT; encode_ch (enc, ']');	320	encode_indent (enc); encode_ch (enc, ']');
239	}	321	}
240		322
241	static void	323	static void
242	encode_he (enc_t *enc, HE *he)	324	encode_he (enc_t *enc, HE *he)
243	{	325	{
…		…
257	else	339	else
258	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	340	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
259		341
260	encode_ch (enc, '"');	342	encode_ch (enc, '"');
261		343
262	if (enc->flags & F_SPACE_BEFORE) SPACE;	344	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
263	encode_ch (enc, ':');	345	encode_ch (enc, ':');
264	if (enc->flags & F_SPACE_AFTER ) SPACE;	346	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
265	encode_sv (enc, HeVAL (he));	347	encode_sv (enc, HeVAL (he));
266	}	348	}
267		349
268	// compare hash entries, used when all keys are bytestrings	350	// compare hash entries, used when all keys are bytestrings
269	static int	351	static int
…		…
275	HE *b = *(HE **)b_;	357	HE *b = *(HE **)b_;
276		358
277	STRLEN la = HeKLEN (a);	359	STRLEN la = HeKLEN (a);
278	STRLEN lb = HeKLEN (b);	360	STRLEN lb = HeKLEN (b);
279		361
280	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	362	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
281	cmp = la < lb ? -1 : la == lb ? 0 : 1;	363	cmp = la - lb;
282		364
283	return cmp;	365	return cmp;
284	}	366	}
285		367
286	// compare hash entries, used when some keys are sv's or utf-x	368	// compare hash entries, used when some keys are sv's or utf-x
…		…
293	static void	375	static void
294	encode_hv (enc_t *enc, HV *hv)	376	encode_hv (enc_t *enc, HV *hv)
295	{	377	{
296	int count, i;	378	int count, i;
297		379
		380	if (enc->indent >= enc->maxdepth)
		381	croak ("data structure too deep (hit recursion limit)");
		382
298	encode_ch (enc, '{'); NL; ++enc->indent;	383	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
299		384
300	if ((count = hv_iterinit (hv)))	385	if ((count = hv_iterinit (hv)))
301	{	386	{
302	// for canonical output we have to sort by keys first	387	// for canonical output we have to sort by keys first
303	// actually, this is mostly due to the stupid so-called	388	// actually, this is mostly due to the stupid so-called
304	// security workaround added somewhere in 5.8.x.	389	// security workaround added somewhere in 5.8.x.
305	// that randomises hash orderings	390	// that randomises hash orderings
306	if (enc->flags & F_CANONICAL)	391	if (enc->json.flags & F_CANONICAL)
307	{	392	{
308	HE *he, *hes [count];
309	int fast = 1;	393	int fast = 1;
		394	HE *he;
		395	#if defined(__BORLANDC__) || defined(_MSC_VER)
		396	HE **hes = _alloca (count * sizeof (HE));
		397	#else
		398	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		399	#endif
310		400
311	i = 0;	401	i = 0;
312	while ((he = hv_iternext (hv)))	402	while ((he = hv_iternext (hv)))
313	{	403	{
314	hes [i++] = he;	404	hes [i++] = he;
…		…
338	LEAVE;	428	LEAVE;
339	}	429	}
340		430
341	for (i = 0; i < count; ++i)	431	for (i = 0; i < count; ++i)
342	{	432	{
343	INDENT;	433	encode_indent (enc);
344	encode_he (enc, hes [i]);	434	encode_he (enc, hes [i]);
345		435
346	if (i < count - 1)	436	if (i < count - 1)
347	COMMA;	437	encode_comma (enc);
348	}	438	}
349		439
350	NL;	440	encode_nl (enc);
351	}	441	}
352	else	442	else
353	{	443	{
354	SV *sv;
355	HE *he = hv_iternext (hv);	444	HE *he = hv_iternext (hv);
356		445
357	for (;;)	446	for (;;)
358	{	447	{
359	INDENT;	448	encode_indent (enc);
360	encode_he (enc, he);	449	encode_he (enc, he);
361		450
362	if (!(he = hv_iternext (hv)))	451	if (!(he = hv_iternext (hv)))
363	break;	452	break;
364		453
365	COMMA;	454	encode_comma (enc);
366	}	455	}
367		456
368	NL;	457	encode_nl (enc);
369	}	458	}
370	}	459	}
371		460
372	--enc->indent; INDENT; encode_ch (enc, '}');	461	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		462	}
		463
		464	// encode objects, arrays and special \0=false and \1=true values.
		465	static void
		466	encode_rv (enc_t *enc, SV *sv)
		467	{
		468	svtype svt;
		469
		470	SvGETMAGIC (sv);
		471	svt = SvTYPE (sv);
		472
		473	if (expect_false (SvOBJECT (sv)))
		474	{
		475	if (SvSTASH (sv) == json_boolean_stash)
		476	{
		477	if (SvIV (sv) == 0)
		478	encode_str (enc, "false", 5, 0);
		479	else
		480	encode_str (enc, "true", 4, 0);
		481	}
		482	else
		483	{
		484	#if 0
		485	if (0 && sv_derived_from (rv, "JSON::Literal"))
		486	{
		487	// not yet
		488	}
		489	#endif
		490	if (enc->json.flags & F_CONV_BLESSED)
		491	{
		492	// we re-bless the reference to get overload and other niceties right
		493	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 1);
		494
		495	if (to_json)
		496	{
		497	dSP; ENTER; SAVETMPS; PUSHMARK (SP);
		498	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		499
		500	// calling with G_SCALAR ensures that we always get a 1 reutrn value
		501	// check anyways.
		502	PUTBACK;
		503	assert (1 == call_sv ((SV *)GvCV (to_json), G_SCALAR));
		504	SPAGAIN;
		505
		506	encode_sv (enc, POPs);
		507
		508	FREETMPS; LEAVE;
		509	}
		510	else if (enc->json.flags & F_ALLOW_BLESSED)
		511	encode_str (enc, "null", 4, 0);
		512	else
		513	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		514	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		515	}
		516	else if (enc->json.flags & F_ALLOW_BLESSED)
		517	encode_str (enc, "null", 4, 0);
		518	else
		519	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		520	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		521	}
		522	}
		523	else if (svt == SVt_PVHV)
		524	encode_hv (enc, (HV *)sv);
		525	else if (svt == SVt_PVAV)
		526	encode_av (enc, (AV *)sv);
		527	else if (svt < SVt_PVAV)
		528	{
		529	if (SvNIOK (sv) && SvIV (sv) == 0)
		530	encode_str (enc, "false", 5, 0);
		531	else if (SvNIOK (sv) && SvIV (sv) == 1)
		532	encode_str (enc, "true", 4, 0);
		533	else
		534	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		535	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		536	}
		537	else
		538	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		539	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
373	}	540	}
374		541
375	static void	542	static void
376	encode_sv (enc_t *enc, SV *sv)	543	encode_sv (enc_t *enc, SV *sv)
377	{	544	{
…		…
385	encode_str (enc, str, len, SvUTF8 (sv));	552	encode_str (enc, str, len, SvUTF8 (sv));
386	encode_ch (enc, '"');	553	encode_ch (enc, '"');
387	}	554	}
388	else if (SvNOKp (sv))	555	else if (SvNOKp (sv))
389	{	556	{
		557	// trust that perl will do the right thing w.r.t. JSON syntax.
390	need (enc, NV_DIG + 32);	558	need (enc, NV_DIG + 32);
391	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	559	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
392	enc->cur += strlen (enc->cur);	560	enc->cur += strlen (enc->cur);
393	}	561	}
394	else if (SvIOKp (sv))	562	else if (SvIOKp (sv))
395	{	563	{
396	need (enc, 64);	564	// we assume we can always read an IV as a UV
		565	if (SvUV (sv) & ~(UV)0x7fff)
		566	{
		567	// large integer, use the (rather slow) snprintf way.
		568	need (enc, sizeof (UV) * 3);
397	enc->cur +=	569	enc->cur +=
398	SvIsUV(sv)	570	SvIsUV(sv)
399	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	571	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
400	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	572	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		573	}
		574	else
		575	{
		576	// optimise the "small number case"
		577	// code will likely be branchless and use only a single multiplication
		578	I32 i = SvIV (sv);
		579	U32 u;
		580	char digit, nz = 0;
		581
		582	need (enc, 6);
		583
		584	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		585	u = i < 0 ? -i : i;
		586
		587	// convert to 4.28 fixed-point representation
		588	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		589
		590	// now output digit by digit, each time masking out the integer part
		591	// and multiplying by 5 while moving the decimal point one to the right,
		592	// resulting in a net multiplication by 10.
		593	// we always write the digit to memory but conditionally increment
		594	// the pointer, to ease the usage of conditional move instructions.
		595	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		596	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		597	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		598	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		599	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		600	}
401	}	601	}
402	else if (SvROK (sv))	602	else if (SvROK (sv))
403	{	603	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))	604	else if (!SvOK (sv))
420	encode_str (enc, "null", 4, 0);	605	encode_str (enc, "null", 4, 0);
421	else	606	else
422	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	607	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
423	SvPV_nolen (sv), SvFLAGS (sv));	608	SvPV_nolen (sv), SvFLAGS (sv));
424	}	609	}
425		610
426	static SV *	611	static SV *
427	encode_json (SV *scalar, UV flags)	612	encode_json (SV *scalar, JSON *json)
428	{	613	{
		614	enc_t enc;
		615
429	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	616	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
430	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	617	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
431		618
432	enc_t enc;	619	enc.json = *json;
433	enc.flags = flags;
434	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	620	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
435	enc.cur = SvPVX (enc.sv);	621	enc.cur = SvPVX (enc.sv);
436	enc.end = SvEND (enc.sv);	622	enc.end = SvEND (enc.sv);
437	enc.max_recurse = 0;
438	enc.indent = 0;	623	enc.indent = 0;
		624	enc.maxdepth = DEC_DEPTH (enc.json.flags);
439		625
440	SvPOK_only (enc.sv);	626	SvPOK_only (enc.sv);
441	encode_sv (&enc, scalar);	627	encode_sv (&enc, scalar);
442		628
		629	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		630	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		631
443	if (!(flags & (F_ASCII | F_UTF8)))	632	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
444	SvUTF8_on (enc.sv);	633	SvUTF8_on (enc.sv);
445		634
446	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
447
448	if (enc.flags & F_SHRINK)	635	if (enc.json.flags & F_SHRINK)
449	shrink (enc.sv);	636	shrink (enc.sv);
450		637
451	return enc.sv;	638	return enc.sv;
452	}	639	}
453		640
454	/////////////////////////////////////////////////////////////////////////////	641	/////////////////////////////////////////////////////////////////////////////
		642	// decoder
455		643
456	#define WS \	644	// structure used for decoding JSON
		645	typedef struct
		646	{
		647	char *cur; // current parser pointer
		648	char *end; // end of input string
		649	const char *err; // parse error, if != 0
		650	JSON json;
		651	U32 depth; // recursion depth
		652	U32 maxdepth; // recursion depth limit
		653	} dec_t;
		654
		655	inline void
		656	decode_ws (dec_t *dec)
		657	{
457	for (;;) \	658	for (;;)
458	{ \	659	{
459	char ch = *dec->cur; \	660	char ch = *dec->cur;
		661
460	if (ch > 0x20 \	662	if (ch > 0x20
461	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	663	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
462	break; \	664	break;
		665
463	++dec->cur; \	666	++dec->cur;
464	}	667	}
		668	}
465		669
466	#define ERR(reason) SB dec->err = reason; goto fail; SE	670	#define ERR(reason) SB dec->err = reason; goto fail; SE
		671
467	#define EXPECT_CH(ch) SB \	672	#define EXPECT_CH(ch) SB \
468	if (*dec->cur != ch) \	673	if (*dec->cur != ch) \
469	ERR (# ch " expected"); \	674	ERR (# ch " expected"); \
470	++dec->cur; \	675	++dec->cur; \
471	SE	676	SE
472		677
		678	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		679	#define DEC_DEC_DEPTH --dec->depth
		680
473	static SV *decode_sv (dec_t *dec);	681	static SV *decode_sv (dec_t *dec);
474		682
475	static signed char decode_hexdigit[256];	683	static signed char decode_hexdigit[256];
476		684
477	static UV	685	static UV
478	decode_4hex (dec_t *dec)	686	decode_4hex (dec_t *dec)
479	{	687	{
480	signed char d1, d2, d3, d4;	688	signed char d1, d2, d3, d4;
		689	unsigned char *cur = (unsigned char *)dec->cur;
481		690
482	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	691	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");	692	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]];	693	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");	694	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		695
491	dec->cur += 4;	696	dec->cur += 4;
492		697
493	return ((UV)d1) << 12	698	return ((UV)d1) << 12
494	| ((UV)d2) << 8	699	| ((UV)d2) << 8
…		…
497		702
498	fail:	703	fail:
499	return (UV)-1;	704	return (UV)-1;
500	}	705	}
501		706
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 *	707	static SV *
518	decode_str (dec_t *dec)	708	decode_str (dec_t *dec)
519	{	709	{
520	SV *sv = NEWSV (0,2);	710	SV *sv = 0;
521	int utf8 = 0;	711	int utf8 = 0;
522	char *cur = SvPVX (sv);	712	char *dec_cur = dec->cur;
523	char *end = SvEND (sv);
524		713
525	for (;;)	714	do
526	{	715	{
527	unsigned char ch = *(unsigned char *)dec->cur;	716	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		717	char *cur = buf;
528		718
529	if (ch == '"')	719	do
530	break;
531	else if (ch == '\\')
532	{	720	{
533	switch (*++dec->cur)	721	unsigned char ch = *(unsigned char *)dec_cur++;
		722
		723	if (expect_false (ch == '"'))
534	{	724	{
535	case '\\':	725	--dec_cur;
536	case '/':	726	break;
537	case '"': APPEND_CH (*dec->cur++); break;	727	}
538		728	else if (expect_false (ch == '\\'))
539	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	729	{
540	case 't': APPEND_CH ('\011'); ++dec->cur; break;	730	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	{	731	{
547	UV lo, hi;	732	case '\\':
548	++dec->cur;	733	case '/':
		734	case '"': *cur++ = *dec_cur++; break;
549		735
550	hi = decode_4hex (dec);	736	case 'b': ++dec_cur; *cur++ = '\010'; break;
551	if (hi == (UV)-1)	737	case 't': ++dec_cur; *cur++ = '\011'; break;
552	goto fail;	738	case 'n': ++dec_cur; *cur++ = '\012'; break;
		739	case 'f': ++dec_cur; *cur++ = '\014'; break;
		740	case 'r': ++dec_cur; *cur++ = '\015'; break;
553		741
554	// possibly a surrogate pair	742	case 'u':
555	if (hi >= 0xd800 && hi < 0xdc00)
556	{	743	{
557	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	744	UV lo, hi;
558	ERR ("missing low surrogate character in surrogate pair");	745	++dec_cur;
559		746
560	dec->cur += 2;	747	dec->cur = dec_cur;
561
562	lo = decode_4hex (dec);	748	hi = decode_4hex (dec);
		749	dec_cur = dec->cur;
563	if (lo == (UV)-1)	750	if (hi == (UV)-1)
564	goto fail;	751	goto fail;
565		752
		753	// possibly a surrogate pair
		754	if (hi >= 0xd800)
		755	if (hi < 0xdc00)
		756	{
		757	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		758	ERR ("missing low surrogate character in surrogate pair");
		759
		760	dec_cur += 2;
		761
		762	dec->cur = dec_cur;
		763	lo = decode_4hex (dec);
		764	dec_cur = dec->cur;
		765	if (lo == (UV)-1)
		766	goto fail;
		767
566	if (lo < 0xdc00 || lo >= 0xe000)	768	if (lo < 0xdc00 || lo >= 0xe000)
567	ERR ("surrogate pair expected");	769	ERR ("surrogate pair expected");
568		770
569	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	771	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		772	}
		773	else if (hi < 0xe000)
		774	ERR ("missing high surrogate character in surrogate pair");
		775
		776	if (hi >= 0x80)
		777	{
		778	utf8 = 1;
		779
		780	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		781	}
		782	else
		783	*cur++ = hi;
570	}	784	}
571	else if (hi >= 0xdc00 && hi < 0xe000)
572	ERR ("missing high surrogate character in surrogate pair");
573
574	if (hi >= 0x80)
575	{	785	break;
576	utf8 = 1;
577		786
578	APPEND_GROW (4); // at most 4 bytes for 21 bits
579	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
580	}
581	else	787	default:
582	APPEND_CH (hi);	788	--dec_cur;
		789	ERR ("illegal backslash escape sequence in string");
583	}	790	}
584	break;	791	}
		792	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		793	*cur++ = ch;
		794	else if (ch >= 0x80)
		795	{
		796	STRLEN clen;
		797	UV uch;
585		798
586	default:
587	--dec->cur;	799	--dec_cur;
588	ERR ("illegal backslash escape sequence in string");	800
		801	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		802	if (clen == (STRLEN)-1)
		803	ERR ("malformed UTF-8 character in JSON string");
		804
		805	do
		806	*cur++ = *dec_cur++;
		807	while (--clen);
		808
		809	utf8 = 1;
		810	}
		811	else
		812	{
		813	--dec_cur;
		814
		815	if (!ch)
		816	ERR ("unexpected end of string while parsing JSON string");
		817	else
		818	ERR ("invalid character encountered while parsing JSON string");
589	}	819	}
590	}	820	}
591	else if (ch >= 0x20 && ch <= 0x7f)	821	while (cur < buf + SHORT_STRING_LEN);
592	APPEND_CH (*dec->cur++);	822
593	else if (ch >= 0x80)
594	{	823	{
595	STRLEN clen;	824	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		825
600	APPEND_GROW (clen);	826	if (sv)
601	do
602	{	827	{
603	*cur++ = *dec->cur++;	828	SvGROW (sv, SvCUR (sv) + len + 1);
		829	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		830	SvCUR_set (sv, SvCUR (sv) + len);
604	}	831	}
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	832	else
612	ERR ("invalid character encountered");	833	sv = newSVpvn (buf, len);
613	}	834	}
		835	}
		836	while (*dec_cur != '"');
614		837
615	++dec->cur;	838	++dec_cur;
616		839
617	SvCUR_set (sv, cur - SvPVX (sv));	840	if (sv)
618		841	{
619	SvPOK_only (sv);	842	SvPOK_only (sv);
620	*SvEND (sv) = 0;	843	*SvEND (sv) = 0;
621		844
622	if (utf8)	845	if (utf8)
623	SvUTF8_on (sv);	846	SvUTF8_on (sv);
		847	}
		848	else
		849	sv = newSVpvn ("", 0);
624		850
625	if (dec->flags & F_SHRINK)	851	dec->cur = dec_cur;
626	shrink (sv);
627
628	return sv;	852	return sv;
629		853
630	fail:	854	fail:
631	SvREFCNT_dec (sv);	855	dec->cur = dec_cur;
632	return 0;	856	return 0;
633	}	857	}
634		858
635	static SV *	859	static SV *
636	decode_num (dec_t *dec)	860	decode_num (dec_t *dec)
…		…
694	is_nv = 1;	918	is_nv = 1;
695	}	919	}
696		920
697	if (!is_nv)	921	if (!is_nv)
698	{	922	{
699	UV uv;	923	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
700	int numtype = grok_number (start, dec->cur - start, &uv);	924	if (*start == '-')
701	if (numtype & IS_NUMBER_IN_UV)	925	switch (dec->cur - start)
702	if (numtype & IS_NUMBER_NEG)
703	{	926	{
704	if (uv < (UV)IV_MIN)	927	case 2: return newSViv (-( start [1] - '0' * 1));
705	return newSViv (-(IV)uv);	928	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		929	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		930	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
706	}	931	}
		932	else
		933	switch (dec->cur - start)
		934	{
		935	case 1: return newSViv ( start [0] - '0' * 1);
		936	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		937	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		938	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		939	}
		940
		941	{
		942	UV uv;
		943	int numtype = grok_number (start, dec->cur - start, &uv);
		944	if (numtype & IS_NUMBER_IN_UV)
		945	if (numtype & IS_NUMBER_NEG)
		946	{
		947	if (uv < (UV)IV_MIN)
		948	return newSViv (-(IV)uv);
		949	}
707	else	950	else
708	return newSVuv (uv);	951	return newSVuv (uv);
		952
		953	// here would likely be the place for bigint support
709	}	954	}
		955	}
710		956
		957	// if we ever support bigint or bigfloat, this is the place for bigfloat
711	return newSVnv (Atof (start));	958	return newSVnv (Atof (start));
712		959
713	fail:	960	fail:
714	return 0;	961	return 0;
715	}	962	}
…		…
717	static SV *	964	static SV *
718	decode_av (dec_t *dec)	965	decode_av (dec_t *dec)
719	{	966	{
720	AV *av = newAV ();	967	AV *av = newAV ();
721		968
722	WS;	969	DEC_INC_DEPTH;
		970	decode_ws (dec);
		971
723	if (*dec->cur == ']')	972	if (*dec->cur == ']')
724	++dec->cur;	973	++dec->cur;
725	else	974	else
726	for (;;)	975	for (;;)
727	{	976	{
…		…
731	if (!value)	980	if (!value)
732	goto fail;	981	goto fail;
733		982
734	av_push (av, value);	983	av_push (av, value);
735		984
736	WS;	985	decode_ws (dec);
737		986
738	if (*dec->cur == ']')	987	if (*dec->cur == ']')
739	{	988	{
740	++dec->cur;	989	++dec->cur;
741	break;	990	break;
…		…
745	ERR (", or ] expected while parsing array");	994	ERR (", or ] expected while parsing array");
746		995
747	++dec->cur;	996	++dec->cur;
748	}	997	}
749		998
		999	DEC_DEC_DEPTH;
750	return newRV_noinc ((SV *)av);	1000	return newRV_noinc ((SV *)av);
751		1001
752	fail:	1002	fail:
753	SvREFCNT_dec (av);	1003	SvREFCNT_dec (av);
		1004	DEC_DEC_DEPTH;
754	return 0;	1005	return 0;
755	}	1006	}
756		1007
757	static SV *	1008	static SV *
758	decode_hv (dec_t *dec)	1009	decode_hv (dec_t *dec)
759	{	1010	{
		1011	SV *sv;
760	HV *hv = newHV ();	1012	HV *hv = newHV ();
761		1013
762	WS;	1014	DEC_INC_DEPTH;
		1015	decode_ws (dec);
		1016
763	if (*dec->cur == '}')	1017	if (*dec->cur == '}')
764	++dec->cur;	1018	++dec->cur;
765	else	1019	else
766	for (;;)	1020	for (;;)
767	{	1021	{
		1022	decode_ws (dec); EXPECT_CH ('"');
		1023
		1024	// heuristic: assume that
		1025	// a) decode_str + hv_store_ent are abysmally slow.
		1026	// b) most hash keys are short, simple ascii text.
		1027	// => try to "fast-match" such strings to avoid
		1028	// the overhead of decode_str + hv_store_ent.
		1029	{
768	SV *key, *value;	1030	SV *value;
		1031	char *p = dec->cur;
		1032	char *e = p + 24; // only try up to 24 bytes
769		1033
770	WS; EXPECT_CH ('"');	1034	for (;;)
771
772	key = decode_str (dec);
773	if (!key)
774	goto fail;
775
776	WS; EXPECT_CH (':');
777
778	value = decode_sv (dec);
779	if (!value)
780	{	1035	{
		1036	// the >= 0x80 is true on most architectures
		1037	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1038	{
		1039	// slow path, back up and use decode_str
		1040	SV *key = decode_str (dec);
		1041	if (!key)
		1042	goto fail;
		1043
		1044	decode_ws (dec); EXPECT_CH (':');
		1045
		1046	value = decode_sv (dec);
		1047	if (!value)
		1048	{
		1049	SvREFCNT_dec (key);
		1050	goto fail;
		1051	}
		1052
		1053	hv_store_ent (hv, key, value, 0);
781	SvREFCNT_dec (key);	1054	SvREFCNT_dec (key);
		1055
		1056	break;
		1057	}
		1058	else if (*p == '"')
		1059	{
		1060	// fast path, got a simple key
		1061	char *key = dec->cur;
		1062	int len = p - key;
		1063	dec->cur = p + 1;
		1064
		1065	decode_ws (dec); EXPECT_CH (':');
		1066
		1067	value = decode_sv (dec);
		1068	if (!value)
782	goto fail;	1069	goto fail;
		1070
		1071	hv_store (hv, key, len, value, 0);
		1072
		1073	break;
		1074	}
		1075
		1076	++p;
783	}	1077	}
784
785	//TODO: optimise
786	hv_store_ent (hv, key, value, 0);
787
788	WS;	1078	}
		1079
		1080	decode_ws (dec);
789		1081
790	if (*dec->cur == '}')	1082	if (*dec->cur == '}')
791	{	1083	{
792	++dec->cur;	1084	++dec->cur;
793	break;	1085	break;
…		…
797	ERR (", or } expected while parsing object/hash");	1089	ERR (", or } expected while parsing object/hash");
798		1090
799	++dec->cur;	1091	++dec->cur;
800	}	1092	}
801		1093
		1094	DEC_DEC_DEPTH;
		1095	sv = newRV_noinc ((SV *)hv);
		1096
		1097	// check filter callbacks
		1098	if (dec->json.flags & F_HOOK)
		1099	{
		1100	ENTER; SAVETMPS;
		1101
		1102	if (HvKEYS (hv) == 1 && dec->json.cb_sk_object)
		1103	{
		1104	int count;
		1105
		1106	dSP; PUSHMARK (SP);
		1107	XPUSHs (sv_2mortal (sv));
		1108
		1109	PUTBACK; count = call_sv (dec->json.cb_sk_object, G_ARRAY); SPAGAIN;
		1110
		1111	if (count == 1)
		1112	sv = newSVsv (POPs);
		1113	else
		1114	SvREFCNT_inc (sv);
		1115	}
		1116
		1117	if (dec->json.cb_object)
		1118	{
		1119	int count;
		1120
		1121	dSP; ENTER; SAVETMPS; PUSHMARK (SP);
		1122	XPUSHs (sv_2mortal (sv));
		1123
		1124	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1125
		1126	if (count == 1)
		1127	sv = newSVsv (POPs);
		1128	else
		1129	SvREFCNT_inc (sv);
		1130	}
		1131
		1132	FREETMPS; LEAVE;
		1133	}
		1134
802	return newRV_noinc ((SV *)hv);	1135	return newRV_noinc ((SV *)hv);
803		1136
804	fail:	1137	fail:
805	SvREFCNT_dec (hv);	1138	SvREFCNT_dec (hv);
		1139	DEC_DEC_DEPTH;
806	return 0;	1140	return 0;
807	}	1141	}
808		1142
809	static SV *	1143	static SV *
810	decode_sv (dec_t *dec)	1144	decode_sv (dec_t *dec)
811	{	1145	{
812	WS;	1146	decode_ws (dec);
		1147
		1148	// the beauty of JSON: you need exactly one character lookahead
		1149	// to parse anything.
813	switch (*dec->cur)	1150	switch (*dec->cur)
814	{	1151	{
815	case '"': ++dec->cur; return decode_str (dec);	1152	case '"': ++dec->cur; return decode_str (dec);
816	case '[': ++dec->cur; return decode_av (dec);	1153	case '[': ++dec->cur; return decode_av (dec);
817	case '{': ++dec->cur; return decode_hv (dec);	1154	case '{': ++dec->cur; return decode_hv (dec);
…		…
823		1160
824	case 't':	1161	case 't':
825	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1162	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
826	{	1163	{
827	dec->cur += 4;	1164	dec->cur += 4;
828	return newSViv (1);	1165	return SvREFCNT_inc (json_true);
829	}	1166	}
830	else	1167	else
831	ERR ("'true' expected");	1168	ERR ("'true' expected");
832		1169
833	break;	1170	break;
834		1171
835	case 'f':	1172	case 'f':
836	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1173	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
837	{	1174	{
838	dec->cur += 5;	1175	dec->cur += 5;
839	return newSViv (0);	1176	return SvREFCNT_inc (json_false);
840	}	1177	}
841	else	1178	else
842	ERR ("'false' expected");	1179	ERR ("'false' expected");
843		1180
844	break;	1181	break;
…		…
853	ERR ("'null' expected");	1190	ERR ("'null' expected");
854		1191
855	break;	1192	break;
856		1193
857	default:	1194	default:
858	ERR ("malformed json string, neither array, object, number, string or atom");	1195	ERR ("malformed JSON string, neither array, object, number, string or atom");
859	break;	1196	break;
860	}	1197	}
861		1198
862	fail:	1199	fail:
863	return 0;	1200	return 0;
864	}	1201	}
865		1202
866	static SV *	1203	static SV *
867	decode_json (SV *string, UV flags)	1204	decode_json (SV *string, JSON *json, UV *offset_return)
868	{	1205	{
		1206	dec_t dec;
		1207	UV offset;
869	SV *sv;	1208	SV *sv;
870		1209
		1210	SvGETMAGIC (string);
		1211	SvUPGRADE (string, SVt_PV);
		1212
		1213	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1214	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1215	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1216
871	if (flags & F_UTF8)	1217	if (json->flags & F_UTF8)
872	sv_utf8_downgrade (string, 0);	1218	sv_utf8_downgrade (string, 0);
873	else	1219	else
874	sv_utf8_upgrade (string);	1220	sv_utf8_upgrade (string);
875		1221
876	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1222	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
877		1223
878	dec_t dec;	1224	dec.json = *json;
879	dec.flags = flags;
880	dec.cur = SvPVX (string);	1225	dec.cur = SvPVX (string);
881	dec.end = SvEND (string);	1226	dec.end = SvEND (string);
882	dec.err = 0;	1227	dec.err = 0;
		1228	dec.depth = 0;
		1229	dec.maxdepth = DEC_DEPTH (dec.json.flags);
883		1230
		1231	if (dec.json.cb_object || dec.json.cb_sk_object)
		1232	dec.json.flags |= F_HOOK;
		1233
		1234	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
884	sv = decode_sv (&dec);	1235	sv = decode_sv (&dec);
885		1236
		1237	if (!(offset_return || !sv))
		1238	{
		1239	// check for trailing garbage
		1240	decode_ws (&dec);
		1241
		1242	if (*dec.cur)
		1243	{
		1244	dec.err = "garbage after JSON object";
		1245	SvREFCNT_dec (sv);
		1246	sv = 0;
		1247	}
		1248	}
		1249
		1250	if (offset_return || !sv)
		1251	{
		1252	offset = dec.json.flags & F_UTF8
		1253	? dec.cur - SvPVX (string)
		1254	: utf8_distance (dec.cur, SvPVX (string));
		1255
		1256	if (offset_return)
		1257	*offset_return = offset;
		1258	}
		1259
886	if (!sv)	1260	if (!sv)
887	{	1261	{
888	IV offset = dec.flags & F_UTF8
889	? dec.cur - SvPVX (string)
890	: utf8_distance (dec.cur, SvPVX (string));
891	SV *uni = sv_newmortal ();	1262	SV *uni = sv_newmortal ();
892		1263
893	// horrible hack to silence warning inside pv_uni_display	1264	// horrible hack to silence warning inside pv_uni_display
894	COP cop = *PL_curcop;	1265	COP cop = *PL_curcop;
895	cop.cop_warnings = pWARN_NONE;	1266	cop.cop_warnings = pWARN_NONE;
…		…
897	SAVEVPTR (PL_curcop);	1268	SAVEVPTR (PL_curcop);
898	PL_curcop = &cop;	1269	PL_curcop = &cop;
899	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1270	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
900	LEAVE;	1271	LEAVE;
901		1272
902	croak ("%s, at character offset %d (%s)",	1273	croak ("%s, at character offset %d [\"%s\"]",
903	dec.err,	1274	dec.err,
904	(int)offset,	1275	(int)offset,
905	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1276	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
906	}	1277	}
907		1278
908	sv = sv_2mortal (sv);	1279	sv = sv_2mortal (sv);
909		1280
910	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1281	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)");	1282	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
912		1283
913	return sv;	1284	return sv;
914	}	1285	}
915		1286
		1287	/////////////////////////////////////////////////////////////////////////////
		1288	// XS interface functions
		1289
916	MODULE = JSON::XS PACKAGE = JSON::XS	1290	MODULE = JSON::XS PACKAGE = JSON::XS
917		1291
918	BOOT:	1292	BOOT:
919	{	1293	{
920	int i;	1294	int i;
921		1295
922	memset (decode_hexdigit, 0xff, 256);
923	for (i = 10; i--; )	1296	for (i = 0; i < 256; ++i)
924	decode_hexdigit ['0' + i] = i;	1297	decode_hexdigit [i] =
		1298	i >= '0' && i <= '9' ? i - '0'
		1299	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1300	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1301	: -1;
925		1302
926	for (i = 7; i--; )	1303	json_stash = gv_stashpv ("JSON::XS" , 1);
		1304	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1305
		1306	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1307	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1308	}
		1309
		1310	PROTOTYPES: DISABLE
		1311
		1312	void new (char *klass)
		1313	PPCODE:
		1314	{
		1315	SV *pv = NEWSV (0, sizeof (JSON));
		1316	SvPOK_only (pv);
		1317	Zero (SvPVX (pv), 1, JSON);
		1318	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1319	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
		1320	}
		1321
		1322	void ascii (JSON *self, int enable = 1)
		1323	ALIAS:
		1324	ascii = F_ASCII
		1325	latin1 = F_LATIN1
		1326	utf8 = F_UTF8
		1327	indent = F_INDENT
		1328	canonical = F_CANONICAL
		1329	space_before = F_SPACE_BEFORE
		1330	space_after = F_SPACE_AFTER
		1331	pretty = F_PRETTY
		1332	allow_nonref = F_ALLOW_NONREF
		1333	shrink = F_SHRINK
		1334	allow_blessed = F_ALLOW_BLESSED
		1335	convert_blessed = F_CONV_BLESSED
		1336	PPCODE:
		1337	{
		1338	if (enable)
		1339	self->flags |= ix;
		1340	else
		1341	self->flags &= ~ix;
		1342
		1343	XPUSHs (ST (0));
		1344	}
		1345
		1346	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1347	PPCODE:
		1348	{
		1349	UV log2 = 0;
		1350
		1351	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1352
		1353	while ((1UL << log2) < max_depth)
		1354	++log2;
		1355
		1356	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1357
		1358	XPUSHs (ST (0));
		1359	}
		1360
		1361	void max_size (JSON *self, UV max_size = 0)
		1362	PPCODE:
		1363	{
		1364	UV log2 = 0;
		1365
		1366	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1367	if (max_size == 1) max_size = 2;
		1368
		1369	while ((1UL << log2) < max_size)
		1370	++log2;
		1371
		1372	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1373
		1374	XPUSHs (ST (0));
		1375	}
		1376
		1377	void filter_json_objects (JSON *self, SV *cb = &PL_sv_undef)
		1378	ALIAS:
		1379	filter_sk_json_objects = 1
		1380	PPCODE:
		1381	{
		1382	if (!SvOK (cb))
		1383	cb = 0;
		1384
		1385	switch (ix)
927	{	1386	{
928	decode_hexdigit ['a' + i] = 10 + i;	1387	case 0: self->cb_object = cb; break;
929	decode_hexdigit ['A' + i] = 10 + i;	1388	case 1: self->cb_sk_object = cb; break;
930	}	1389	}
931		1390
932	json_stash = gv_stashpv ("JSON::XS", 1);	1391	XPUSHs (ST (0));
933	}	1392	}
934		1393
935	PROTOTYPES: DISABLE
936
937	SV *new (char *dummy)
938	CODE:
939	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);
940	OUTPUT:
941	RETVAL
942
943	SV *ascii (SV *self, int enable = 1)
944	ALIAS:
945	ascii = F_ASCII
946	utf8 = F_UTF8
947	indent = F_INDENT
948	canonical = F_CANONICAL
949	space_before = F_SPACE_BEFORE
950	space_after = F_SPACE_AFTER
951	json_rpc = F_JSON_RPC
952	pretty = F_PRETTY
953	allow_nonref = F_ALLOW_NONREF
954	shrink = F_SHRINK
955	CODE:
956	{
957	UV *uv = SvJSON (self);
958	if (enable)
959	*uv |= ix;
960	else
961	*uv &= ~ix;
962
963	RETVAL = newSVsv (self);
964	}
965	OUTPUT:
966	RETVAL
967
968	void encode (SV *self, SV *scalar)	1394	void encode (JSON *self, SV *scalar)
969	PPCODE:	1395	PPCODE:
970	XPUSHs (encode_json (scalar, *SvJSON (self)));	1396	XPUSHs (encode_json (scalar, self));
971		1397
972	void decode (SV *self, SV *jsonstr)	1398	void decode (JSON *self, SV *jsonstr)
973	PPCODE:	1399	PPCODE:
974	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1400	XPUSHs (decode_json (jsonstr, self, 0));
		1401
		1402	void decode_prefix (JSON *self, SV *jsonstr)
		1403	PPCODE:
		1404	{
		1405	UV offset;
		1406	EXTEND (SP, 2);
		1407	PUSHs (decode_json (jsonstr, self, &offset));
		1408	PUSHs (sv_2mortal (newSVuv (offset)));
		1409	}
975		1410
976	PROTOTYPES: ENABLE	1411	PROTOTYPES: ENABLE
977		1412
978	void to_json (SV *scalar)	1413	void to_json (SV *scalar)
979	PPCODE:	1414	PPCODE:
		1415	{
		1416	JSON json = { F_DEFAULT | F_UTF8 };
980	XPUSHs (encode_json (scalar, F_UTF8));	1417	XPUSHs (encode_json (scalar, &json));
		1418	}
981		1419
982	void from_json (SV *jsonstr)	1420	void from_json (SV *jsonstr)
983	PPCODE:	1421	PPCODE:
		1422	{
		1423	JSON json = { F_DEFAULT | F_UTF8 };
984	XPUSHs (decode_json (jsonstr, F_UTF8));	1424	XPUSHs (decode_json (jsonstr, &json, 0));
		1425	}
985		1426

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