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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 1.108 by root, Tue Aug 17 23:27:36 2010 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 <limits.h>
		10	#include <float.h>
8		11
		12	#if defined(__BORLANDC__) || defined(_MSC_VER)
		13	# define snprintf _snprintf // C compilers have this in stdio.h
		14	#endif
		15
		16	// some old perls do not have this, try to make it work, no
		17	// guarantees, though. if it breaks, you get to keep the pieces.
		18	#ifndef UTF8_MAXBYTES
		19	# define UTF8_MAXBYTES 13
		20	#endif
		21
		22	// three extra for rounding, sign, and end of string
		23	#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
		24
9	#define F_ASCII 0x00000001	25	#define F_ASCII 0x00000001UL
		26	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	27	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	28	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	29	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	30	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	31	#define F_SPACE_AFTER 0x00000040UL
15	#define F_JSON_RPC 0x00000040
16	#define F_ALLOW_NONREF 0x00000080	32	#define F_ALLOW_NONREF 0x00000100UL
17	#define F_SHRINK 0x00000100	33	#define F_SHRINK 0x00000200UL
		34	#define F_ALLOW_BLESSED 0x00000400UL
		35	#define F_CONV_BLESSED 0x00000800UL
		36	#define F_RELAXED 0x00001000UL
		37	#define F_ALLOW_UNKNOWN 0x00002000UL
		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
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
21		41
22	#define INIT_SIZE 32 // initial scalar size to be allocated	42	#define INIT_SIZE 32 // initial scalar size to be allocated
		43	#define INDENT_STEP 3 // spaces per indentation level
		44
		45	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
		46
		47	#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
23		48
24	#define SB do {	49	#define SB do {
25	#define SE } while (0)	50	#define SE } while (0)
26		51
27	static HV *json_stash;	52	#if __GNUC__ >= 3
		53	# define expect(expr,value) __builtin_expect ((expr), (value))
		54	# define INLINE static inline
		55	#else
		56	# define expect(expr,value) (expr)
		57	# define INLINE static
		58	#endif
		59
		60	#define expect_false(expr) expect ((expr) != 0, 0)
		61	#define expect_true(expr) expect ((expr) != 0, 1)
		62
		63	#define IN_RANGE_INC(type,val,beg,end) \
		64	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		65	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		66
		67	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		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	enum {
		81	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		82	INCR_M_STR, // inside string
		83	INCR_M_BS, // inside backslash
		84	INCR_M_C0, // inside comment in initial whitespace sequence
		85	INCR_M_C1, // inside comment in other places
		86	INCR_M_JSON // outside anything, count nesting
		87	};
		88
		89	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		90
		91	typedef struct {
		92	U32 flags;
		93	U32 max_depth;
		94	STRLEN max_size;
		95
		96	SV *cb_object;
		97	HV *cb_sk_object;
		98
		99	// for the incremental parser
		100	SV *incr_text; // the source text so far
		101	STRLEN incr_pos; // the current offset into the text
		102	int incr_nest; // {[]}-nesting level
		103	unsigned char incr_mode;
		104	} JSON;
		105
		106	INLINE void
		107	json_init (JSON *json)
		108	{
		109	Zero (json, 1, JSON);
		110	json->max_depth = 512;
		111	}
		112
		113	/////////////////////////////////////////////////////////////////////////////
		114	// utility functions
		115
		116	INLINE SV *
		117	get_bool (const char *name)
		118	{
		119	SV *sv = get_sv (name, 1);
		120
		121	SvREADONLY_on (sv);
		122	SvREADONLY_on (SvRV (sv));
		123
		124	return sv;
		125	}
		126
		127	INLINE void
		128	shrink (SV *sv)
		129	{
		130	sv_utf8_downgrade (sv, 1);
		131
		132	if (SvLEN (sv) > SvCUR (sv) + 1)
		133	{
		134	#ifdef SvPV_shrink_to_cur
		135	SvPV_shrink_to_cur (sv);
		136	#elif defined (SvPV_renew)
		137	SvPV_renew (sv, SvCUR (sv) + 1);
		138	#endif
		139	}
		140	}
		141
		142	// decode an utf-8 character and return it, or (UV)-1 in
		143	// case of an error.
		144	// we special-case "safe" characters from U+80 .. U+7FF,
		145	// but use the very good perl function to parse anything else.
		146	// note that we never call this function for a ascii codepoints
		147	INLINE UV
		148	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		149	{
		150	if (expect_true (len >= 2
		151	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		152	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		153	{
		154	*clen = 2;
		155	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		156	}
		157	else
		158	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		159	}
		160
		161	// likewise for encoding, also never called for ascii codepoints
		162	// this function takes advantage of this fact, although current gccs
		163	// seem to optimise the check for >= 0x80 away anyways
		164	INLINE unsigned char *
		165	encode_utf8 (unsigned char *s, UV ch)
		166	{
		167	if (expect_false (ch < 0x000080))
		168	*s++ = ch;
		169	else if (expect_true (ch < 0x000800))
		170	*s++ = 0xc0 | ( ch >> 6),
		171	*s++ = 0x80 | ( ch & 0x3f);
		172	else if ( ch < 0x010000)
		173	*s++ = 0xe0 | ( ch >> 12),
		174	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		175	*s++ = 0x80 | ( ch & 0x3f);
		176	else if ( ch < 0x110000)
		177	*s++ = 0xf0 | ( ch >> 18),
		178	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		179	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		180	*s++ = 0x80 | ( ch & 0x3f);
		181
		182	return s;
		183	}
		184
		185	// convert offset pointer to character index, sv must be string
		186	static STRLEN
		187	ptr_to_index (SV *sv, char *offset)
		188	{
		189	return SvUTF8 (sv)
		190	? utf8_distance (offset, SvPVX (sv))
		191	: offset - SvPVX (sv);
		192	}
		193
		194	/////////////////////////////////////////////////////////////////////////////
		195	// fp hell
		196
		197	// scan a group of digits, and a trailing exponent
		198	static void
		199	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		200	{
		201	UV uaccum = 0;
		202	int eaccum = 0;
		203
		204	// if we recurse too deep, skip all remaining digits
		205	// to avoid a stack overflow attack
		206	if (expect_false (--maxdepth <= 0))
		207	while (((U8)*s - '0') < 10)
		208	++s;
		209
		210	for (;;)
		211	{
		212	U8 dig = (U8)*s - '0';
		213
		214	if (expect_false (dig >= 10))
		215	{
		216	if (dig == (U8)((U8)'.' - (U8)'0'))
		217	{
		218	++s;
		219	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		220	}
		221	else if ((dig | ' ') == 'e' - '0')
		222	{
		223	int exp2 = 0;
		224	int neg = 0;
		225
		226	++s;
		227
		228	if (*s == '-')
		229	{
		230	++s;
		231	neg = 1;
		232	}
		233	else if (*s == '+')
		234	++s;
		235
		236	while ((dig = (U8)*s - '0') < 10)
		237	exp2 = exp2 * 10 + *s++ - '0';
		238
		239	*expo += neg ? -exp2 : exp2;
		240	}
		241
		242	break;
		243	}
		244
		245	++s;
		246
		247	uaccum = uaccum * 10 + dig;
		248	++eaccum;
		249
		250	// if we have too many digits, then recurse for more
		251	// we actually do this for rather few digits
		252	if (uaccum >= (UV_MAX - 9) / 10)
		253	{
		254	if (postdp) *expo -= eaccum;
		255	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		256	if (postdp) *expo += eaccum;
		257
		258	break;
		259	}
		260	}
		261
		262	// this relies greatly on the quality of the pow ()
		263	// implementation of the platform, but a good
		264	// implementation is hard to beat.
		265	if (postdp) *expo -= eaccum;
		266	*accum += uaccum * Perl_pow (10., *expo);
		267	*expo += eaccum;
		268	}
		269
		270	static NV
		271	json_atof (const char *s)
		272	{
		273	NV accum = 0.;
		274	int expo = 0;
		275	int neg = 0;
		276
		277	if (*s == '-')
		278	{
		279	++s;
		280	neg = 1;
		281	}
		282
		283	// a recursion depth of ten gives us >>500 bits
		284	json_atof_scan1 (s, &accum, &expo, 0, 10);
		285
		286	return neg ? -accum : accum;
		287	}
		288	/////////////////////////////////////////////////////////////////////////////
		289	// encoder
28		290
29	// structure used for encoding JSON	291	// structure used for encoding JSON
30	typedef struct	292	typedef struct
31	{	293	{
32	char *cur;	294	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	295	char *end; // SvEND (sv)
35	SV *sv;	296	SV *sv; // result scalar
36	UV flags;	297	JSON json;
37	int max_recurse;	298	U32 indent; // indentation level
38	int indent;	299	UV limit; // escape character values >= this value when encoding
39	} enc_t;	300	} enc_t;
40		301
41	// structure used for decoding JSON	302	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)	303	need (enc_t *enc, STRLEN len)
72	{	304	{
73	if (enc->cur + len >= enc->end)	305	if (expect_false (enc->cur + len >= enc->end))
74	{	306	{
75	STRLEN cur = enc->cur - SvPVX (enc->sv);	307	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
76	SvGROW (enc->sv, cur + len + 1);	308	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
77	enc->cur = SvPVX (enc->sv) + cur;	309	enc->cur = SvPVX (enc->sv) + cur;
78	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	310	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79	}	311	}
80	}	312	}
81		313
82	static void	314	INLINE void
83	encode_ch (enc_t *enc, char ch)	315	encode_ch (enc_t *enc, char ch)
84	{	316	{
85	need (enc, 1);	317	need (enc, 1);
86	*enc->cur++ = ch;	318	*enc->cur++ = ch;
87	}	319	}
…		…
95		327
96	while (str < end)	328	while (str < end)
97	{	329	{
98	unsigned char ch = *(unsigned char *)str;	330	unsigned char ch = *(unsigned char *)str;
99		331
100	if (ch >= 0x20 && ch < 0x80) // most common case	332	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101	{	333	{
102	if (ch == '"') // but with slow exceptions	334	if (expect_false (ch == '"')) // but with slow exceptions
103	{	335	{
104	need (enc, len += 1);	336	need (enc, len += 1);
105	*enc->cur++ = '\\';	337	*enc->cur++ = '\\';
106	*enc->cur++ = '"';	338	*enc->cur++ = '"';
107	}	339	}
108	else if (ch == '\\')	340	else if (expect_false (ch == '\\'))
109	{	341	{
110	need (enc, len += 1);	342	need (enc, len += 1);
111	*enc->cur++ = '\\';	343	*enc->cur++ = '\\';
112	*enc->cur++ = '\\';	344	*enc->cur++ = '\\';
113	}	345	}
…		…
131	STRLEN clen;	363	STRLEN clen;
132	UV uch;	364	UV uch;
133		365
134	if (is_utf8)	366	if (is_utf8)
135	{	367	{
136	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	368	uch = decode_utf8 (str, end - str, &clen);
137	if (clen == (STRLEN)-1)	369	if (clen == (STRLEN)-1)
138	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	370	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139	}	371	}
140	else	372	else
141	{	373	{
142	uch = ch;	374	uch = ch;
143	clen = 1;	375	clen = 1;
144	}	376	}
145		377
146	if (uch > 0x10FFFFUL)	378	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	{	379	{
151	if (uch > 0xFFFFUL)	380	if (uch >= 0x10000UL)
152	{	381	{
		382	if (uch >= 0x110000UL)
		383	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		384
153	need (enc, len += 11);	385	need (enc, len += 11);
154	sprintf (enc->cur, "\\u%04x\\u%04x",	386	sprintf (enc->cur, "\\u%04x\\u%04x",
155	(uch - 0x10000) / 0x400 + 0xD800,	387	(int)((uch - 0x10000) / 0x400 + 0xD800),
156	(uch - 0x10000) % 0x400 + 0xDC00);	388	(int)((uch - 0x10000) % 0x400 + 0xDC00));
157	enc->cur += 12;	389	enc->cur += 12;
158	}	390	}
159	else	391	else
160	{	392	{
161	static char hexdigit [16] = "0123456789abcdef";
162	need (enc, len += 5);	393	need (enc, len += 5);
163	*enc->cur++ = '\\';	394	*enc->cur++ = '\\';
164	*enc->cur++ = 'u';	395	*enc->cur++ = 'u';
165	*enc->cur++ = hexdigit [ uch >> 12 ];	396	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
166	*enc->cur++ = hexdigit [(uch >> 8) & 15];	397	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
167	*enc->cur++ = hexdigit [(uch >> 4) & 15];	398	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
168	*enc->cur++ = hexdigit [(uch >> 0) & 15];	399	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
169	}	400	}
170		401
		402	str += clen;
		403	}
		404	else if (enc->json.flags & F_LATIN1)
		405	{
		406	*enc->cur++ = uch;
171	str += clen;	407	str += clen;
172	}	408	}
173	else if (is_utf8)	409	else if (is_utf8)
174	{	410	{
175	need (enc, len += clen);	411	need (enc, len += clen);
…		…
179	}	415	}
180	while (--clen);	416	while (--clen);
181	}	417	}
182	else	418	else
183	{	419	{
184	need (enc, len += 10); // never more than 11 bytes needed	420	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
185	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	421	enc->cur = encode_utf8 (enc->cur, uch);
186	++str;	422	++str;
187	}	423	}
188	}	424	}
189	}	425	}
190	}	426	}
191		427
192	--len;	428	--len;
193	}	429	}
194	}	430	}
195		431
196	#define INDENT SB \	432	INLINE void
		433	encode_indent (enc_t *enc)
		434	{
197	if (enc->flags & F_INDENT) \	435	if (enc->json.flags & F_INDENT)
198	{ \	436	{
199	int i_; \	437	int spaces = enc->indent * INDENT_STEP;
200	need (enc, enc->indent); \	438
201	for (i_ = enc->indent * 3; i_--; )\	439	need (enc, spaces);
		440	memset (enc->cur, ' ', spaces);
		441	enc->cur += spaces;
		442	}
		443	}
		444
		445	INLINE void
		446	encode_space (enc_t *enc)
		447	{
		448	need (enc, 1);
		449	encode_ch (enc, ' ');
		450	}
		451
		452	INLINE void
		453	encode_nl (enc_t *enc)
		454	{
		455	if (enc->json.flags & F_INDENT)
		456	{
		457	need (enc, 1);
202	encode_ch (enc, ' '); \	458	encode_ch (enc, '\n');
203	} \	459	}
204	SE	460	}
205		461
206	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	462	INLINE void
207	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	463	encode_comma (enc_t *enc)
208	#define COMMA SB \	464	{
209	encode_ch (enc, ','); \	465	encode_ch (enc, ',');
		466
210	if (enc->flags & F_INDENT) \	467	if (enc->json.flags & F_INDENT)
211	NL; \	468	encode_nl (enc);
212	else if (enc->flags & F_SPACE_AFTER) \	469	else if (enc->json.flags & F_SPACE_AFTER)
213	SPACE; \	470	encode_space (enc);
214	SE	471	}
215		472
216	static void encode_sv (enc_t *enc, SV *sv);	473	static void encode_sv (enc_t *enc, SV *sv);
217		474
218	static void	475	static void
219	encode_av (enc_t *enc, AV *av)	476	encode_av (enc_t *enc, AV *av)
220	{	477	{
221	int i, len = av_len (av);	478	int i, len = av_len (av);
222		479
		480	if (enc->indent >= enc->json.max_depth)
		481	croak (ERR_NESTING_EXCEEDED);
		482
223	encode_ch (enc, '['); NL;	483	encode_ch (enc, '[');
224	++enc->indent;	484
		485	if (len >= 0)
		486	{
		487	encode_nl (enc); ++enc->indent;
225		488
226	for (i = 0; i <= len; ++i)	489	for (i = 0; i <= len; ++i)
227	{	490	{
228	INDENT;	491	SV **svp = av_fetch (av, i, 0);
229	encode_sv (enc, *av_fetch (av, i, 0));
230		492
		493	encode_indent (enc);
		494
		495	if (svp)
		496	encode_sv (enc, *svp);
		497	else
		498	encode_str (enc, "null", 4, 0);
		499
231	if (i < len)	500	if (i < len)
232	COMMA;	501	encode_comma (enc);
233	}	502	}
234		503
235	NL;	504	encode_nl (enc); --enc->indent; encode_indent (enc);
236		505	}
237	--enc->indent;	506
238	INDENT; encode_ch (enc, ']');	507	encode_ch (enc, ']');
239	}	508	}
240		509
241	static void	510	static void
242	encode_he (enc_t *enc, HE *he)	511	encode_hk (enc_t *enc, HE *he)
243	{	512	{
244	encode_ch (enc, '"');	513	encode_ch (enc, '"');
245		514
246	if (HeKLEN (he) == HEf_SVKEY)	515	if (HeKLEN (he) == HEf_SVKEY)
247	{	516	{
…		…
257	else	526	else
258	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	527	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
259		528
260	encode_ch (enc, '"');	529	encode_ch (enc, '"');
261		530
262	if (enc->flags & F_SPACE_BEFORE) SPACE;	531	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
263	encode_ch (enc, ':');	532	encode_ch (enc, ':');
264	if (enc->flags & F_SPACE_AFTER ) SPACE;	533	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
265	encode_sv (enc, HeVAL (he));
266	}	534	}
267		535
268	// compare hash entries, used when all keys are bytestrings	536	// compare hash entries, used when all keys are bytestrings
269	static int	537	static int
270	he_cmp_fast (const void *a_, const void *b_)	538	he_cmp_fast (const void *a_, const void *b_)
…		…
275	HE *b = *(HE **)b_;	543	HE *b = *(HE **)b_;
276		544
277	STRLEN la = HeKLEN (a);	545	STRLEN la = HeKLEN (a);
278	STRLEN lb = HeKLEN (b);	546	STRLEN lb = HeKLEN (b);
279		547
280	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	548	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
281	cmp = la < lb ? -1 : la == lb ? 0 : 1;	549	cmp = lb - la;
282		550
283	return cmp;	551	return cmp;
284	}	552	}
285		553
286	// compare hash entries, used when some keys are sv's or utf-x	554	// compare hash entries, used when some keys are sv's or utf-x
287	static int	555	static int
288	he_cmp_slow (const void *a, const void *b)	556	he_cmp_slow (const void *a, const void *b)
289	{	557	{
290	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	558	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
291	}	559	}
292		560
293	static void	561	static void
294	encode_hv (enc_t *enc, HV *hv)	562	encode_hv (enc_t *enc, HV *hv)
295	{	563	{
296	int count, i;	564	HE *he;
297		565
298	encode_ch (enc, '{'); NL; ++enc->indent;	566	if (enc->indent >= enc->json.max_depth)
		567	croak (ERR_NESTING_EXCEEDED);
299		568
300	if ((count = hv_iterinit (hv)))	569	encode_ch (enc, '{');
301	{	570
302	// for canonical output we have to sort by keys first	571	// for canonical output we have to sort by keys first
303	// actually, this is mostly due to the stupid so-called	572	// actually, this is mostly due to the stupid so-called
304	// security workaround added somewhere in 5.8.x.	573	// security workaround added somewhere in 5.8.x
305	// that randomises hash orderings	574	// that randomises hash orderings
306	if (enc->flags & F_CANONICAL)	575	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		576	{
		577	int count = hv_iterinit (hv);
		578
		579	if (SvMAGICAL (hv))
307	{	580	{
308	HE *he, *hes [count];	581	// need to count by iterating. could improve by dynamically building the vector below
		582	// but I don't care for the speed of this special case.
		583	// note also that we will run into undefined behaviour when the two iterations
		584	// do not result in the same count, something I might care for in some later release.
		585
		586	count = 0;
		587	while (hv_iternext (hv))
		588	++count;
		589
		590	hv_iterinit (hv);
		591	}
		592
		593	if (count)
		594	{
309	int fast = 1;	595	int i, fast = 1;
		596	#if defined(__BORLANDC__) || defined(_MSC_VER)
		597	HE **hes = _alloca (count * sizeof (HE));
		598	#else
		599	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		600	#endif
310		601
311	i = 0;	602	i = 0;
312	while ((he = hv_iternext (hv)))	603	while ((he = hv_iternext (hv)))
313	{	604	{
314	hes [i++] = he;	605	hes [i++] = he;
…		…
336		627
337	FREETMPS;	628	FREETMPS;
338	LEAVE;	629	LEAVE;
339	}	630	}
340		631
341	for (i = 0; i < count; ++i)	632	encode_nl (enc); ++enc->indent;
		633
		634	while (count--)
		635	{
		636	encode_indent (enc);
		637	he = hes [count];
		638	encode_hk (enc, he);
		639	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		640
		641	if (count)
		642	encode_comma (enc);
		643	}
		644
		645	encode_nl (enc); --enc->indent; encode_indent (enc);
		646	}
		647	}
		648	else
		649	{
		650	if (hv_iterinit (hv) || SvMAGICAL (hv))
		651	if ((he = hv_iternext (hv)))
		652	{
		653	encode_nl (enc); ++enc->indent;
		654
		655	for (;;)
342	{	656	{
343	INDENT;	657	encode_indent (enc);
344	encode_he (enc, hes [i]);	658	encode_hk (enc, he);
		659	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
345		660
346	if (i < count - 1)	661	if (!(he = hv_iternext (hv)))
347	COMMA;	662	break;
		663
		664	encode_comma (enc);
348	}	665	}
349		666
		667	encode_nl (enc); --enc->indent; encode_indent (enc);
350	NL;	668	}
		669	}
		670
		671	encode_ch (enc, '}');
		672	}
		673
		674	// encode objects, arrays and special \0=false and \1=true values.
		675	static void
		676	encode_rv (enc_t *enc, SV *sv)
		677	{
		678	svtype svt;
		679
		680	SvGETMAGIC (sv);
		681	svt = SvTYPE (sv);
		682
		683	if (expect_false (SvOBJECT (sv)))
		684	{
		685	HV *stash = !JSON_SLOW || json_boolean_stash
		686	? json_boolean_stash
		687	: gv_stashpv ("JSON::XS::Boolean", 1);
		688
		689	if (SvSTASH (sv) == stash)
		690	{
		691	if (SvIV (sv))
		692	encode_str (enc, "true", 4, 0);
		693	else
		694	encode_str (enc, "false", 5, 0);
351	}	695	}
352	else	696	else
353	{	697	{
354	SV *sv;	698	#if 0
355	HE *he = hv_iternext (hv);	699	if (0 && sv_derived_from (rv, "JSON::Literal"))
356
357	for (;;)
358	{
359	INDENT;
360	encode_he (enc, he);
361
362	if (!(he = hv_iternext (hv)))
363	break;
364
365	COMMA;
366	}	700	{
367		701	// not yet
368	NL;	702	}
		703	#endif
		704	if (enc->json.flags & F_CONV_BLESSED)
		705	{
		706	// we re-bless the reference to get overload and other niceties right
		707	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		708
		709	if (to_json)
		710	{
		711	dSP;
		712
		713	ENTER; SAVETMPS; PUSHMARK (SP);
		714	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		715
		716	// calling with G_SCALAR ensures that we always get a 1 return value
		717	PUTBACK;
		718	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		719	SPAGAIN;
		720
		721	// catch this surprisingly common error
		722	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		723	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		724
		725	sv = POPs;
		726	PUTBACK;
		727
		728	encode_sv (enc, sv);
		729
		730	FREETMPS; LEAVE;
		731	}
		732	else if (enc->json.flags & F_ALLOW_BLESSED)
		733	encode_str (enc, "null", 4, 0);
		734	else
		735	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		736	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		737	}
		738	else if (enc->json.flags & F_ALLOW_BLESSED)
		739	encode_str (enc, "null", 4, 0);
		740	else
		741	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		742	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
369	}	743	}
370	}	744	}
		745	else if (svt == SVt_PVHV)
		746	encode_hv (enc, (HV *)sv);
		747	else if (svt == SVt_PVAV)
		748	encode_av (enc, (AV *)sv);
		749	else if (svt < SVt_PVAV)
		750	{
		751	STRLEN len = 0;
		752	char *pv = svt ? SvPV (sv, len) : 0;
371		753
372	--enc->indent; INDENT; encode_ch (enc, '}');	754	if (len == 1 && *pv == '1')
		755	encode_str (enc, "true", 4, 0);
		756	else if (len == 1 && *pv == '0')
		757	encode_str (enc, "false", 5, 0);
		758	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		759	encode_str (enc, "null", 4, 0);
		760	else
		761	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		762	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		763	}
		764	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		765	encode_str (enc, "null", 4, 0);
		766	else
		767	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		768	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
373	}	769	}
374		770
375	static void	771	static void
376	encode_sv (enc_t *enc, SV *sv)	772	encode_sv (enc_t *enc, SV *sv)
377	{	773	{
…		…
385	encode_str (enc, str, len, SvUTF8 (sv));	781	encode_str (enc, str, len, SvUTF8 (sv));
386	encode_ch (enc, '"');	782	encode_ch (enc, '"');
387	}	783	}
388	else if (SvNOKp (sv))	784	else if (SvNOKp (sv))
389	{	785	{
		786	// trust that perl will do the right thing w.r.t. JSON syntax.
390	need (enc, NV_DIG + 32);	787	need (enc, NV_DIG + 32);
391	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	788	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
392	enc->cur += strlen (enc->cur);	789	enc->cur += strlen (enc->cur);
393	}	790	}
394	else if (SvIOKp (sv))	791	else if (SvIOKp (sv))
395	{	792	{
		793	// we assume we can always read an IV as a UV and vice versa
		794	// we assume two's complement
		795	// we assume no aliasing issues in the union
		796	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		797	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		798	{
		799	// optimise the "small number case"
		800	// code will likely be branchless and use only a single multiplication
		801	// works for numbers up to 59074
		802	I32 i = SvIVX (sv);
		803	U32 u;
		804	char digit, nz = 0;
		805
396	need (enc, 64);	806	need (enc, 6);
		807
		808	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		809	u = i < 0 ? -i : i;
		810
		811	// convert to 4.28 fixed-point representation
		812	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		813
		814	// now output digit by digit, each time masking out the integer part
		815	// and multiplying by 5 while moving the decimal point one to the right,
		816	// resulting in a net multiplication by 10.
		817	// we always write the digit to memory but conditionally increment
		818	// the pointer, to enable the use of conditional move instructions.
		819	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		820	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		821	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		822	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		823	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		824	}
		825	else
		826	{
		827	// large integer, use the (rather slow) snprintf way.
		828	need (enc, IVUV_MAXCHARS);
397	enc->cur +=	829	enc->cur +=
398	SvIsUV(sv)	830	SvIsUV(sv)
399	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	831	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
400	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	832	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		833	}
401	}	834	}
402	else if (SvROK (sv))	835	else if (SvROK (sv))
403	{	836	encode_rv (enc, SvRV (sv));
404	SV *rv = SvRV (sv);	837	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
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))
420	encode_str (enc, "null", 4, 0);	838	encode_str (enc, "null", 4, 0);
421	else	839	else
422	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	840	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
423	SvPV_nolen (sv), SvFLAGS (sv));	841	SvPV_nolen (sv), SvFLAGS (sv));
424	}	842	}
425		843
426	static SV *	844	static SV *
427	encode_json (SV *scalar, UV flags)	845	encode_json (SV *scalar, JSON *json)
428	{	846	{
		847	enc_t enc;
		848
429	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	849	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
430	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	850	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
431		851
432	enc_t enc;	852	enc.json = *json;
433	enc.flags = flags;
434	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	853	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
435	enc.cur = SvPVX (enc.sv);	854	enc.cur = SvPVX (enc.sv);
436	enc.end = SvEND (enc.sv);	855	enc.end = SvEND (enc.sv);
437	enc.max_recurse = 0;
438	enc.indent = 0;	856	enc.indent = 0;
		857	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		858	: enc.json.flags & F_LATIN1 ? 0x000100UL
		859	: 0x110000UL;
439		860
440	SvPOK_only (enc.sv);	861	SvPOK_only (enc.sv);
441	encode_sv (&enc, scalar);	862	encode_sv (&enc, scalar);
		863	encode_nl (&enc);
442		864
		865	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		866	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		867
443	if (!(flags & (F_ASCII | F_UTF8)))	868	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
444	SvUTF8_on (enc.sv);	869	SvUTF8_on (enc.sv);
445		870
446	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
447
448	if (enc.flags & F_SHRINK)	871	if (enc.json.flags & F_SHRINK)
449	shrink (enc.sv);	872	shrink (enc.sv);
450		873
451	return enc.sv;	874	return enc.sv;
452	}	875	}
453		876
454	/////////////////////////////////////////////////////////////////////////////	877	/////////////////////////////////////////////////////////////////////////////
		878	// decoder
455		879
456	#define WS \	880	// structure used for decoding JSON
		881	typedef struct
		882	{
		883	char *cur; // current parser pointer
		884	char *end; // end of input string
		885	const char *err; // parse error, if != 0
		886	JSON json;
		887	U32 depth; // recursion depth
		888	U32 maxdepth; // recursion depth limit
		889	} dec_t;
		890
		891	INLINE void
		892	decode_comment (dec_t *dec)
		893	{
		894	// only '#'-style comments allowed a.t.m.
		895
		896	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		897	++dec->cur;
		898	}
		899
		900	INLINE void
		901	decode_ws (dec_t *dec)
		902	{
457	for (;;) \	903	for (;;)
458	{ \	904	{
459	char ch = *dec->cur; \	905	char ch = *dec->cur;
		906
460	if (ch > 0x20 \	907	if (ch > 0x20)
		908	{
		909	if (expect_false (ch == '#'))
		910	{
		911	if (dec->json.flags & F_RELAXED)
		912	decode_comment (dec);
		913	else
		914	break;
		915	}
		916	else
		917	break;
		918	}
461	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	919	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
462	break; \	920	break; // parse error, but let higher level handle it, gives better error messages
		921
463	++dec->cur; \	922	++dec->cur;
464	}	923	}
		924	}
465		925
466	#define ERR(reason) SB dec->err = reason; goto fail; SE	926	#define ERR(reason) SB dec->err = reason; goto fail; SE
		927
467	#define EXPECT_CH(ch) SB \	928	#define EXPECT_CH(ch) SB \
468	if (*dec->cur != ch) \	929	if (*dec->cur != ch) \
469	ERR (# ch " expected"); \	930	ERR (# ch " expected"); \
470	++dec->cur; \	931	++dec->cur; \
471	SE	932	SE
472		933
		934	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		935	#define DEC_DEC_DEPTH --dec->depth
		936
473	static SV *decode_sv (dec_t *dec);	937	static SV *decode_sv (dec_t *dec);
474		938
475	static signed char decode_hexdigit[256];	939	static signed char decode_hexdigit[256];
476		940
477	static UV	941	static UV
478	decode_4hex (dec_t *dec)	942	decode_4hex (dec_t *dec)
479	{	943	{
480	signed char d1, d2, d3, d4;	944	signed char d1, d2, d3, d4;
		945	unsigned char *cur = (unsigned char *)dec->cur;
481		946
482	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	947	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");	948	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]];	949	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");	950	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		951
491	dec->cur += 4;	952	dec->cur += 4;
492		953
493	return ((UV)d1) << 12	954	return ((UV)d1) << 12
494	| ((UV)d2) << 8	955	| ((UV)d2) << 8
…		…
497		958
498	fail:	959	fail:
499	return (UV)-1;	960	return (UV)-1;
500	}	961	}
501		962
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 *	963	static SV *
518	decode_str (dec_t *dec)	964	decode_str (dec_t *dec)
519	{	965	{
520	SV *sv = NEWSV (0,2);	966	SV *sv = 0;
521	int utf8 = 0;	967	int utf8 = 0;
522	char *cur = SvPVX (sv);	968	char *dec_cur = dec->cur;
523	char *end = SvEND (sv);
524		969
525	for (;;)	970	do
526	{	971	{
527	unsigned char ch = *(unsigned char *)dec->cur;	972	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		973	char *cur = buf;
528		974
529	if (ch == '"')	975	do
530	break;
531	else if (ch == '\\')
532	{	976	{
533	switch (*++dec->cur)	977	unsigned char ch = *(unsigned char *)dec_cur++;
		978
		979	if (expect_false (ch == '"'))
		980	{
		981	--dec_cur;
		982	break;
534	{	983	}
535	case '\\':	984	else if (expect_false (ch == '\\'))
536	case '/':	985	{
537	case '"': APPEND_CH (*dec->cur++); break;	986	switch (*dec_cur)
538
539	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
540	case 't': APPEND_CH ('\011'); ++dec->cur; break;
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	{	987	{
547	UV lo, hi;	988	case '\\':
548	++dec->cur;	989	case '/':
		990	case '"': *cur++ = *dec_cur++; break;
549		991
550	hi = decode_4hex (dec);	992	case 'b': ++dec_cur; *cur++ = '\010'; break;
551	if (hi == (UV)-1)	993	case 't': ++dec_cur; *cur++ = '\011'; break;
552	goto fail;	994	case 'n': ++dec_cur; *cur++ = '\012'; break;
		995	case 'f': ++dec_cur; *cur++ = '\014'; break;
		996	case 'r': ++dec_cur; *cur++ = '\015'; break;
553		997
554	// possibly a surrogate pair	998	case 'u':
555	if (hi >= 0xd800 && hi < 0xdc00)
556	{	999	{
557	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1000	UV lo, hi;
558	ERR ("missing low surrogate character in surrogate pair");	1001	++dec_cur;
559		1002
560	dec->cur += 2;	1003	dec->cur = dec_cur;
561
562	lo = decode_4hex (dec);	1004	hi = decode_4hex (dec);
		1005	dec_cur = dec->cur;
563	if (lo == (UV)-1)	1006	if (hi == (UV)-1)
564	goto fail;	1007	goto fail;
565		1008
		1009	// possibly a surrogate pair
		1010	if (hi >= 0xd800)
		1011	if (hi < 0xdc00)
		1012	{
		1013	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		1014	ERR ("missing low surrogate character in surrogate pair");
		1015
		1016	dec_cur += 2;
		1017
		1018	dec->cur = dec_cur;
		1019	lo = decode_4hex (dec);
		1020	dec_cur = dec->cur;
		1021	if (lo == (UV)-1)
		1022	goto fail;
		1023
566	if (lo < 0xdc00 || lo >= 0xe000)	1024	if (lo < 0xdc00 || lo >= 0xe000)
567	ERR ("surrogate pair expected");	1025	ERR ("surrogate pair expected");
568		1026
569	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	1027	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		1028	}
		1029	else if (hi < 0xe000)
		1030	ERR ("missing high surrogate character in surrogate pair");
		1031
		1032	if (hi >= 0x80)
		1033	{
		1034	utf8 = 1;
		1035
		1036	cur = encode_utf8 (cur, hi);
		1037	}
		1038	else
		1039	*cur++ = hi;
570	}	1040	}
571	else if (hi >= 0xdc00 && hi < 0xe000)
572	ERR ("missing high surrogate character in surrogate pair");
573
574	if (hi >= 0x80)
575	{	1041	break;
576	utf8 = 1;
577		1042
578	APPEND_GROW (4); // at most 4 bytes for 21 bits
579	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
580	}
581	else	1043	default:
582	APPEND_CH (hi);	1044	--dec_cur;
		1045	ERR ("illegal backslash escape sequence in string");
583	}	1046	}
584	break;	1047	}
		1048	else if (expect_true (ch >= 0x20 && ch < 0x80))
		1049	*cur++ = ch;
		1050	else if (ch >= 0x80)
		1051	{
		1052	STRLEN clen;
585		1053
586	default:
587	--dec->cur;	1054	--dec_cur;
588	ERR ("illegal backslash escape sequence in string");	1055
		1056	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		1057	if (clen == (STRLEN)-1)
		1058	ERR ("malformed UTF-8 character in JSON string");
		1059
		1060	do
		1061	*cur++ = *dec_cur++;
		1062	while (--clen);
		1063
		1064	utf8 = 1;
		1065	}
		1066	else
		1067	{
		1068	--dec_cur;
		1069
		1070	if (!ch)
		1071	ERR ("unexpected end of string while parsing JSON string");
		1072	else
		1073	ERR ("invalid character encountered while parsing JSON string");
589	}	1074	}
590	}	1075	}
591	else if (ch >= 0x20 && ch <= 0x7f)	1076	while (cur < buf + SHORT_STRING_LEN);
592	APPEND_CH (*dec->cur++);	1077
593	else if (ch >= 0x80)
594	{	1078	{
595	STRLEN clen;	1079	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		1080
600	APPEND_GROW (clen);	1081	if (sv)
601	do
602	{	1082	{
603	*cur++ = *dec->cur++;	1083	STRLEN cur = SvCUR (sv);
		1084
		1085	if (SvLEN (sv) <= cur + len)
		1086	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1087
		1088	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		1089	SvCUR_set (sv, SvCUR (sv) + len);
604	}	1090	}
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	1091	else
612	ERR ("invalid character encountered");	1092	sv = newSVpvn (buf, len);
613	}	1093	}
		1094	}
		1095	while (*dec_cur != '"');
614		1096
615	++dec->cur;	1097	++dec_cur;
616		1098
617	SvCUR_set (sv, cur - SvPVX (sv));	1099	if (sv)
618		1100	{
619	SvPOK_only (sv);	1101	SvPOK_only (sv);
620	*SvEND (sv) = 0;	1102	*SvEND (sv) = 0;
621		1103
622	if (utf8)	1104	if (utf8)
623	SvUTF8_on (sv);	1105	SvUTF8_on (sv);
		1106	}
		1107	else
		1108	sv = newSVpvn ("", 0);
624		1109
625	if (dec->flags & F_SHRINK)	1110	dec->cur = dec_cur;
626	shrink (sv);
627
628	return sv;	1111	return sv;
629		1112
630	fail:	1113	fail:
631	SvREFCNT_dec (sv);	1114	dec->cur = dec_cur;
632	return 0;	1115	return 0;
633	}	1116	}
634		1117
635	static SV *	1118	static SV *
636	decode_num (dec_t *dec)	1119	decode_num (dec_t *dec)
…		…
694	is_nv = 1;	1177	is_nv = 1;
695	}	1178	}
696		1179
697	if (!is_nv)	1180	if (!is_nv)
698	{	1181	{
699	UV uv;	1182	int len = dec->cur - start;
700	int numtype = grok_number (start, dec->cur - start, &uv);	1183
701	if (numtype & IS_NUMBER_IN_UV)	1184	// special case the rather common 1..5-digit-int case
702	if (numtype & IS_NUMBER_NEG)	1185	if (*start == '-')
		1186	switch (len)
703	{	1187	{
704	if (uv < (UV)IV_MIN)	1188	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
705	return newSViv (-(IV)uv);	1189	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1190	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1191	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1192	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
706	}	1193	}
		1194	else
		1195	switch (len)
		1196	{
		1197	case 1: return newSViv ( start [0] - '0' * 1);
		1198	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1199	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1200	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1201	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1202	}
		1203
		1204	{
		1205	UV uv;
		1206	int numtype = grok_number (start, len, &uv);
		1207	if (numtype & IS_NUMBER_IN_UV)
		1208	if (numtype & IS_NUMBER_NEG)
		1209	{
		1210	if (uv < (UV)IV_MIN)
		1211	return newSViv (-(IV)uv);
		1212	}
707	else	1213	else
708	return newSVuv (uv);	1214	return newSVuv (uv);
709	}	1215	}
710		1216
		1217	len -= *start == '-' ? 1 : 0;
		1218
		1219	// does not fit into IV or UV, try NV
		1220	if (len <= NV_DIG)
		1221	// fits into NV without loss of precision
		1222	return newSVnv (json_atof (start));
		1223
		1224	// everything else fails, convert it to a string
		1225	return newSVpvn (start, dec->cur - start);
		1226	}
		1227
		1228	// loss of precision here
711	return newSVnv (Atof (start));	1229	return newSVnv (json_atof (start));
712		1230
713	fail:	1231	fail:
714	return 0;	1232	return 0;
715	}	1233	}
716		1234
717	static SV *	1235	static SV *
718	decode_av (dec_t *dec)	1236	decode_av (dec_t *dec)
719	{	1237	{
720	AV *av = newAV ();	1238	AV *av = newAV ();
721		1239
722	WS;	1240	DEC_INC_DEPTH;
		1241	decode_ws (dec);
		1242
723	if (*dec->cur == ']')	1243	if (*dec->cur == ']')
724	++dec->cur;	1244	++dec->cur;
725	else	1245	else
726	for (;;)	1246	for (;;)
727	{	1247	{
…		…
731	if (!value)	1251	if (!value)
732	goto fail;	1252	goto fail;
733		1253
734	av_push (av, value);	1254	av_push (av, value);
735		1255
736	WS;	1256	decode_ws (dec);
737		1257
738	if (*dec->cur == ']')	1258	if (*dec->cur == ']')
739	{	1259	{
740	++dec->cur;	1260	++dec->cur;
741	break;	1261	break;
…		…
743		1263
744	if (*dec->cur != ',')	1264	if (*dec->cur != ',')
745	ERR (", or ] expected while parsing array");	1265	ERR (", or ] expected while parsing array");
746		1266
747	++dec->cur;	1267	++dec->cur;
		1268
		1269	decode_ws (dec);
		1270
		1271	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1272	{
		1273	++dec->cur;
		1274	break;
		1275	}
748	}	1276	}
749		1277
		1278	DEC_DEC_DEPTH;
750	return newRV_noinc ((SV *)av);	1279	return newRV_noinc ((SV *)av);
751		1280
752	fail:	1281	fail:
753	SvREFCNT_dec (av);	1282	SvREFCNT_dec (av);
		1283	DEC_DEC_DEPTH;
754	return 0;	1284	return 0;
755	}	1285	}
756		1286
757	static SV *	1287	static SV *
758	decode_hv (dec_t *dec)	1288	decode_hv (dec_t *dec)
759	{	1289	{
		1290	SV *sv;
760	HV *hv = newHV ();	1291	HV *hv = newHV ();
761		1292
762	WS;	1293	DEC_INC_DEPTH;
		1294	decode_ws (dec);
		1295
763	if (*dec->cur == '}')	1296	if (*dec->cur == '}')
764	++dec->cur;	1297	++dec->cur;
765	else	1298	else
766	for (;;)	1299	for (;;)
767	{	1300	{
768	SV *key, *value;
769
770	WS; EXPECT_CH ('"');	1301	EXPECT_CH ('"');
771		1302
772	key = decode_str (dec);	1303	// heuristic: assume that
773	if (!key)	1304	// a) decode_str + hv_store_ent are abysmally slow.
774	goto fail;	1305	// b) most hash keys are short, simple ascii text.
		1306	// => try to "fast-match" such strings to avoid
		1307	// the overhead of decode_str + hv_store_ent.
		1308	{
		1309	SV *value;
		1310	char *p = dec->cur;
		1311	char *e = p + 24; // only try up to 24 bytes
775		1312
776	WS; EXPECT_CH (':');	1313	for (;;)
777
778	value = decode_sv (dec);
779	if (!value)
780	{	1314	{
		1315	// the >= 0x80 is false on most architectures
		1316	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1317	{
		1318	// slow path, back up and use decode_str
		1319	SV *key = decode_str (dec);
		1320	if (!key)
		1321	goto fail;
		1322
		1323	decode_ws (dec); EXPECT_CH (':');
		1324
		1325	decode_ws (dec);
		1326	value = decode_sv (dec);
		1327	if (!value)
		1328	{
		1329	SvREFCNT_dec (key);
		1330	goto fail;
		1331	}
		1332
		1333	hv_store_ent (hv, key, value, 0);
781	SvREFCNT_dec (key);	1334	SvREFCNT_dec (key);
		1335
		1336	break;
		1337	}
		1338	else if (*p == '"')
		1339	{
		1340	// fast path, got a simple key
		1341	char *key = dec->cur;
		1342	int len = p - key;
		1343	dec->cur = p + 1;
		1344
		1345	decode_ws (dec); EXPECT_CH (':');
		1346
		1347	decode_ws (dec);
		1348	value = decode_sv (dec);
		1349	if (!value)
782	goto fail;	1350	goto fail;
		1351
		1352	hv_store (hv, key, len, value, 0);
		1353
		1354	break;
		1355	}
		1356
		1357	++p;
783	}	1358	}
784
785	//TODO: optimise
786	hv_store_ent (hv, key, value, 0);
787
788	WS;	1359	}
		1360
		1361	decode_ws (dec);
789		1362
790	if (*dec->cur == '}')	1363	if (*dec->cur == '}')
791	{	1364	{
792	++dec->cur;	1365	++dec->cur;
793	break;	1366	break;
…		…
795		1368
796	if (*dec->cur != ',')	1369	if (*dec->cur != ',')
797	ERR (", or } expected while parsing object/hash");	1370	ERR (", or } expected while parsing object/hash");
798		1371
799	++dec->cur;	1372	++dec->cur;
		1373
		1374	decode_ws (dec);
		1375
		1376	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1377	{
		1378	++dec->cur;
		1379	break;
		1380	}
800	}	1381	}
801		1382
		1383	DEC_DEC_DEPTH;
802	return newRV_noinc ((SV *)hv);	1384	sv = newRV_noinc ((SV *)hv);
		1385
		1386	// check filter callbacks
		1387	if (dec->json.flags & F_HOOK)
		1388	{
		1389	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1390	{
		1391	HE *cb, *he;
		1392
		1393	hv_iterinit (hv);
		1394	he = hv_iternext (hv);
		1395	hv_iterinit (hv);
		1396
		1397	// the next line creates a mortal sv each time its called.
		1398	// might want to optimise this for common cases.
		1399	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1400
		1401	if (cb)
		1402	{
		1403	dSP;
		1404	int count;
		1405
		1406	ENTER; SAVETMPS; PUSHMARK (SP);
		1407	XPUSHs (HeVAL (he));
		1408	sv_2mortal (sv);
		1409
		1410	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1411
		1412	if (count == 1)
		1413	{
		1414	sv = newSVsv (POPs);
		1415	FREETMPS; LEAVE;
		1416	return sv;
		1417	}
		1418
		1419	SvREFCNT_inc (sv);
		1420	FREETMPS; LEAVE;
		1421	}
		1422	}
		1423
		1424	if (dec->json.cb_object)
		1425	{
		1426	dSP;
		1427	int count;
		1428
		1429	ENTER; SAVETMPS; PUSHMARK (SP);
		1430	XPUSHs (sv_2mortal (sv));
		1431
		1432	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1433
		1434	if (count == 1)
		1435	{
		1436	sv = newSVsv (POPs);
		1437	FREETMPS; LEAVE;
		1438	return sv;
		1439	}
		1440
		1441	SvREFCNT_inc (sv);
		1442	FREETMPS; LEAVE;
		1443	}
		1444	}
		1445
		1446	return sv;
803		1447
804	fail:	1448	fail:
805	SvREFCNT_dec (hv);	1449	SvREFCNT_dec (hv);
		1450	DEC_DEC_DEPTH;
806	return 0;	1451	return 0;
807	}	1452	}
808		1453
809	static SV *	1454	static SV *
810	decode_sv (dec_t *dec)	1455	decode_sv (dec_t *dec)
811	{	1456	{
812	WS;	1457	// the beauty of JSON: you need exactly one character lookahead
		1458	// to parse everything.
813	switch (*dec->cur)	1459	switch (*dec->cur)
814	{	1460	{
815	case '"': ++dec->cur; return decode_str (dec);	1461	case '"': ++dec->cur; return decode_str (dec);
816	case '[': ++dec->cur; return decode_av (dec);	1462	case '[': ++dec->cur; return decode_av (dec);
817	case '{': ++dec->cur; return decode_hv (dec);	1463	case '{': ++dec->cur; return decode_hv (dec);
818		1464
819	case '-':	1465	case '-':
820	case '0': case '1': case '2': case '3': case '4':	1466	case '0': case '1': case '2': case '3': case '4':
821	case '5': case '6': case '7': case '8': case '9':	1467	case '5': case '6': case '7': case '8': case '9':
822	return decode_num (dec);	1468	return decode_num (dec);
823		1469
824	case 't':	1470	case 't':
825	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1471	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
826	{	1472	{
827	dec->cur += 4;	1473	dec->cur += 4;
		1474	#if JSON_SLOW
		1475	json_true = get_bool ("JSON::XS::true");
		1476	#endif
828	return newSViv (1);	1477	return newSVsv (json_true);
829	}	1478	}
830	else	1479	else
831	ERR ("'true' expected");	1480	ERR ("'true' expected");
832		1481
833	break;	1482	break;
834		1483
835	case 'f':	1484	case 'f':
836	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1485	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
837	{	1486	{
838	dec->cur += 5;	1487	dec->cur += 5;
		1488	#if JSON_SLOW
		1489	json_false = get_bool ("JSON::XS::false");
		1490	#endif
839	return newSViv (0);	1491	return newSVsv (json_false);
840	}	1492	}
841	else	1493	else
842	ERR ("'false' expected");	1494	ERR ("'false' expected");
843		1495
844	break;	1496	break;
…		…
853	ERR ("'null' expected");	1505	ERR ("'null' expected");
854		1506
855	break;	1507	break;
856		1508
857	default:	1509	default:
858	ERR ("malformed json string, neither array, object, number, string or atom");	1510	ERR ("malformed JSON string, neither array, object, number, string or atom");
859	break;	1511	break;
860	}	1512	}
861		1513
862	fail:	1514	fail:
863	return 0;	1515	return 0;
864	}	1516	}
865		1517
866	static SV *	1518	static SV *
867	decode_json (SV *string, UV flags)	1519	decode_json (SV *string, JSON *json, char **offset_return)
868	{	1520	{
		1521	dec_t dec;
869	SV *sv;	1522	SV *sv;
870		1523
871	if (flags & F_UTF8)	1524	/* work around bugs in 5.10 where manipulating magic values
		1525	* will perl ignore the magic in subsequent accesses
		1526	*/
		1527	/*SvGETMAGIC (string);*/
		1528	if (SvMAGICAL (string))
		1529	string = sv_2mortal (newSVsv (string));
		1530
		1531	SvUPGRADE (string, SVt_PV);
		1532
		1533	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1534	* assertion with -DDEBUGGING, although SvCUR is documented to
		1535	* return the xpv_cur field which certainly exists after upgrading.
		1536	* according to nicholas clark, calling SvPOK fixes this.
		1537	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1538	* and hope for the best.
		1539	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1540	* assertion business is seriously broken, try yet another workaround
		1541	* for the broken -DDEBUGGING.
		1542	*/
		1543	{
		1544	#ifdef DEBUGGING
		1545	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1546	#else
		1547	STRLEN offset = SvCUR (string);
		1548	#endif
		1549
		1550	if (offset > json->max_size && json->max_size)
		1551	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1552	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1553	}
		1554
		1555	if (DECODE_WANTS_OCTETS (json))
872	sv_utf8_downgrade (string, 0);	1556	sv_utf8_downgrade (string, 0);
873	else	1557	else
874	sv_utf8_upgrade (string);	1558	sv_utf8_upgrade (string);
875		1559
876	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1560	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
877		1561
878	dec_t dec;	1562	dec.json = *json;
879	dec.flags = flags;
880	dec.cur = SvPVX (string);	1563	dec.cur = SvPVX (string);
881	dec.end = SvEND (string);	1564	dec.end = SvEND (string);
882	dec.err = 0;	1565	dec.err = 0;
		1566	dec.depth = 0;
883		1567
		1568	if (dec.json.cb_object || dec.json.cb_sk_object)
		1569	dec.json.flags |= F_HOOK;
		1570
		1571	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1572
		1573	decode_ws (&dec);
884	sv = decode_sv (&dec);	1574	sv = decode_sv (&dec);
885		1575
		1576	if (offset_return)
		1577	*offset_return = dec.cur;
		1578
		1579	if (!(offset_return || !sv))
		1580	{
		1581	// check for trailing garbage
		1582	decode_ws (&dec);
		1583
		1584	if (*dec.cur)
		1585	{
		1586	dec.err = "garbage after JSON object";
		1587	SvREFCNT_dec (sv);
		1588	sv = 0;
		1589	}
		1590	}
		1591
886	if (!sv)	1592	if (!sv)
887	{	1593	{
888	IV offset = dec.flags & F_UTF8
889	? dec.cur - SvPVX (string)
890	: utf8_distance (dec.cur, SvPVX (string));
891	SV *uni = sv_newmortal ();	1594	SV *uni = sv_newmortal ();
892		1595
893	// horrible hack to silence warning inside pv_uni_display	1596	// horrible hack to silence warning inside pv_uni_display
894	COP cop = *PL_curcop;	1597	COP cop = *PL_curcop;
895	cop.cop_warnings = pWARN_NONE;	1598	cop.cop_warnings = pWARN_NONE;
…		…
897	SAVEVPTR (PL_curcop);	1600	SAVEVPTR (PL_curcop);
898	PL_curcop = &cop;	1601	PL_curcop = &cop;
899	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1602	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
900	LEAVE;	1603	LEAVE;
901		1604
902	croak ("%s, at character offset %d (%s)",	1605	croak ("%s, at character offset %d (before \"%s\")",
903	dec.err,	1606	dec.err,
904	(int)offset,	1607	ptr_to_index (string, dec.cur),
905	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1608	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
906	}	1609	}
907		1610
908	sv = sv_2mortal (sv);	1611	sv = sv_2mortal (sv);
909		1612
910	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1613	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)");	1614	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
912		1615
913	return sv;	1616	return sv;
914	}	1617	}
915		1618
		1619	/////////////////////////////////////////////////////////////////////////////
		1620	// incremental parser
		1621
		1622	static void
		1623	incr_parse (JSON *self)
		1624	{
		1625	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1626
		1627	// the state machine here is a bit convoluted and could be simplified a lot
		1628	// but this would make it slower, so...
		1629
		1630	for (;;)
		1631	{
		1632	//printf ("loop pod %d *p<%c><%s>, mode %d nest %d\n", p - SvPVX (self->incr_text), *p, p, self->incr_mode, self->incr_nest);//D
		1633	switch (self->incr_mode)
		1634	{
		1635	// only used for initial whitespace skipping
		1636	case INCR_M_WS:
		1637	for (;;)
		1638	{
		1639	if (*p > 0x20)
		1640	{
		1641	if (*p == '#')
		1642	{
		1643	self->incr_mode = INCR_M_C0;
		1644	goto incr_m_c;
		1645	}
		1646	else
		1647	{
		1648	self->incr_mode = INCR_M_JSON;
		1649	goto incr_m_json;
		1650	}
		1651	}
		1652	else if (!*p)
		1653	goto interrupt;
		1654
		1655	++p;
		1656	}
		1657
		1658	// skip a single char inside a string (for \\-processing)
		1659	case INCR_M_BS:
		1660	if (!*p)
		1661	goto interrupt;
		1662
		1663	++p;
		1664	self->incr_mode = INCR_M_STR;
		1665	goto incr_m_str;
		1666
		1667	// inside #-style comments
		1668	case INCR_M_C0:
		1669	case INCR_M_C1:
		1670	incr_m_c:
		1671	for (;;)
		1672	{
		1673	if (*p == '\n')
		1674	{
		1675	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1676	break;
		1677	}
		1678	else if (!*p)
		1679	goto interrupt;
		1680
		1681	++p;
		1682	}
		1683
		1684	break;
		1685
		1686	// inside a string
		1687	case INCR_M_STR:
		1688	incr_m_str:
		1689	for (;;)
		1690	{
		1691	if (*p == '"')
		1692	{
		1693	++p;
		1694	self->incr_mode = INCR_M_JSON;
		1695
		1696	if (!self->incr_nest)
		1697	goto interrupt;
		1698
		1699	goto incr_m_json;
		1700	}
		1701	else if (*p == '\\')
		1702	{
		1703	++p; // "virtually" consumes character after \
		1704
		1705	if (!*p) // if at end of string we have to switch modes
		1706	{
		1707	self->incr_mode = INCR_M_BS;
		1708	goto interrupt;
		1709	}
		1710	}
		1711	else if (!*p)
		1712	goto interrupt;
		1713
		1714	++p;
		1715	}
		1716
		1717	// after initial ws, outside string
		1718	case INCR_M_JSON:
		1719	incr_m_json:
		1720	for (;;)
		1721	{
		1722	switch (*p++)
		1723	{
		1724	case 0:
		1725	--p;
		1726	goto interrupt;
		1727
		1728	case 0x09:
		1729	case 0x0a:
		1730	case 0x0d:
		1731	case 0x20:
		1732	if (!self->incr_nest)
		1733	{
		1734	--p; // do not eat the whitespace, let the next round do it
		1735	goto interrupt;
		1736	}
		1737	break;
		1738
		1739	case '"':
		1740	self->incr_mode = INCR_M_STR;
		1741	goto incr_m_str;
		1742
		1743	case '[':
		1744	case '{':
		1745	if (++self->incr_nest > self->max_depth)
		1746	croak (ERR_NESTING_EXCEEDED);
		1747	break;
		1748
		1749	case ']':
		1750	case '}':
		1751	if (--self->incr_nest <= 0)
		1752	goto interrupt;
		1753	break;
		1754
		1755	case '#':
		1756	self->incr_mode = INCR_M_C1;
		1757	goto incr_m_c;
		1758	}
		1759	}
		1760	}
		1761
		1762	modechange:
		1763	;
		1764	}
		1765
		1766	interrupt:
		1767	self->incr_pos = p - SvPVX (self->incr_text);
		1768	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1769	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
		1770	}
		1771
		1772	/////////////////////////////////////////////////////////////////////////////
		1773	// XS interface functions
		1774
916	MODULE = JSON::XS PACKAGE = JSON::XS	1775	MODULE = JSON::XS PACKAGE = JSON::XS
917		1776
918	BOOT:	1777	BOOT:
919	{	1778	{
920	int i;	1779	int i;
921		1780
922	memset (decode_hexdigit, 0xff, 256);
923	for (i = 10; i--; )	1781	for (i = 0; i < 256; ++i)
924	decode_hexdigit ['0' + i] = i;	1782	decode_hexdigit [i] =
		1783	i >= '0' && i <= '9' ? i - '0'
		1784	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1785	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1786	: -1;
925		1787
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);	1788	json_stash = gv_stashpv ("JSON::XS" , 1);
		1789	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1790
		1791	json_true = get_bool ("JSON::XS::true");
		1792	json_false = get_bool ("JSON::XS::false");
		1793
		1794	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
933	}	1795	}
934		1796
935	PROTOTYPES: DISABLE	1797	PROTOTYPES: DISABLE
936		1798
937	SV *new (char *dummy)	1799	void CLONE (...)
938	CODE:	1800	CODE:
939	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1801	json_stash = 0;
		1802	json_boolean_stash = 0;
		1803
		1804	void new (char *klass)
		1805	PPCODE:
		1806	{
		1807	SV *pv = NEWSV (0, sizeof (JSON));
		1808	SvPOK_only (pv);
		1809	json_init ((JSON *)SvPVX (pv));
		1810	XPUSHs (sv_2mortal (sv_bless (
		1811	newRV_noinc (pv),
		1812	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1813	)));
		1814	}
		1815
		1816	void ascii (JSON *self, int enable = 1)
		1817	ALIAS:
		1818	ascii = F_ASCII
		1819	latin1 = F_LATIN1
		1820	utf8 = F_UTF8
		1821	indent = F_INDENT
		1822	canonical = F_CANONICAL
		1823	space_before = F_SPACE_BEFORE
		1824	space_after = F_SPACE_AFTER
		1825	pretty = F_PRETTY
		1826	allow_nonref = F_ALLOW_NONREF
		1827	shrink = F_SHRINK
		1828	allow_blessed = F_ALLOW_BLESSED
		1829	convert_blessed = F_CONV_BLESSED
		1830	relaxed = F_RELAXED
		1831	allow_unknown = F_ALLOW_UNKNOWN
		1832	PPCODE:
		1833	{
		1834	if (enable)
		1835	self->flags |= ix;
		1836	else
		1837	self->flags &= ~ix;
		1838
		1839	XPUSHs (ST (0));
		1840	}
		1841
		1842	void get_ascii (JSON *self)
		1843	ALIAS:
		1844	get_ascii = F_ASCII
		1845	get_latin1 = F_LATIN1
		1846	get_utf8 = F_UTF8
		1847	get_indent = F_INDENT
		1848	get_canonical = F_CANONICAL
		1849	get_space_before = F_SPACE_BEFORE
		1850	get_space_after = F_SPACE_AFTER
		1851	get_allow_nonref = F_ALLOW_NONREF
		1852	get_shrink = F_SHRINK
		1853	get_allow_blessed = F_ALLOW_BLESSED
		1854	get_convert_blessed = F_CONV_BLESSED
		1855	get_relaxed = F_RELAXED
		1856	get_allow_unknown = F_ALLOW_UNKNOWN
		1857	PPCODE:
		1858	XPUSHs (boolSV (self->flags & ix));
		1859
		1860	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		1861	PPCODE:
		1862	self->max_depth = max_depth;
		1863	XPUSHs (ST (0));
		1864
		1865	U32 get_max_depth (JSON *self)
		1866	CODE:
		1867	RETVAL = self->max_depth;
940	OUTPUT:	1868	OUTPUT:
941	RETVAL	1869	RETVAL
942		1870
943	SV *ascii (SV *self, int enable = 1)	1871	void max_size (JSON *self, U32 max_size = 0)
944	ALIAS:	1872	PPCODE:
945	ascii = F_ASCII	1873	self->max_size = max_size;
946	utf8 = F_UTF8	1874	XPUSHs (ST (0));
947	indent = F_INDENT	1875
948	canonical = F_CANONICAL	1876	int get_max_size (JSON *self)
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:	1877	CODE:
956	{	1878	RETVAL = self->max_size;
957	UV *uv = SvJSON (self);
958	if (enable)
959	*uv |= ix;
960	else
961	*uv &= ~ix;
962
963	RETVAL = newSVsv (self);
964	}
965	OUTPUT:	1879	OUTPUT:
966	RETVAL	1880	RETVAL
967		1881
968	void encode (SV *self, SV *scalar)	1882	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
969	PPCODE:	1883	PPCODE:
970	XPUSHs (encode_json (scalar, *SvJSON (self)));	1884	{
		1885	SvREFCNT_dec (self->cb_object);
		1886	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
971		1887
972	void decode (SV *self, SV *jsonstr)	1888	XPUSHs (ST (0));
		1889	}
		1890
		1891	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
973	PPCODE:	1892	PPCODE:
		1893	{
		1894	if (!self->cb_sk_object)
		1895	self->cb_sk_object = newHV ();
		1896
		1897	if (SvOK (cb))
		1898	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1899	else
		1900	{
		1901	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1902
		1903	if (!HvKEYS (self->cb_sk_object))
		1904	{
		1905	SvREFCNT_dec (self->cb_sk_object);
		1906	self->cb_sk_object = 0;
		1907	}
		1908	}
		1909
		1910	XPUSHs (ST (0));
		1911	}
		1912
		1913	void encode (JSON *self, SV *scalar)
		1914	PPCODE:
		1915	XPUSHs (encode_json (scalar, self));
		1916
		1917	void decode (JSON *self, SV *jsonstr)
		1918	PPCODE:
974	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1919	XPUSHs (decode_json (jsonstr, self, 0));
		1920
		1921	void decode_prefix (JSON *self, SV *jsonstr)
		1922	PPCODE:
		1923	{
		1924	char *offset;
		1925	EXTEND (SP, 2);
		1926	PUSHs (decode_json (jsonstr, self, &offset));
		1927	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		1928	}
		1929
		1930	void incr_parse (JSON *self, SV *jsonstr = 0)
		1931	PPCODE:
		1932	{
		1933	if (!self->incr_text)
		1934	self->incr_text = newSVpvn ("", 0);
		1935
		1936	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		1937	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		1938	if (DECODE_WANTS_OCTETS (self))
		1939	{
		1940	if (self->incr_pos)
		1941	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		1942	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		1943
		1944	sv_utf8_downgrade (self->incr_text, 0);
		1945	}
		1946	else
		1947	{
		1948	sv_utf8_upgrade (self->incr_text);
		1949
		1950	if (self->incr_pos)
		1951	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		1952	- (U8 *)SvPVX (self->incr_text);
		1953	}
		1954
		1955	// append data, if any
		1956	if (jsonstr)
		1957	{
		1958	/* make sure both strings have same encoding */
		1959	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		1960	if (SvUTF8 (jsonstr))
		1961	sv_utf8_downgrade (jsonstr, 0);
		1962	else
		1963	sv_utf8_upgrade (jsonstr);
		1964
		1965	/* and then just blindly append */
		1966	{
		1967	STRLEN len;
		1968	const char *str = SvPV (jsonstr, len);
		1969	STRLEN cur = SvCUR (self->incr_text);
		1970
		1971	if (SvLEN (self->incr_text) <= cur + len)
		1972	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1973
		1974	Move (str, SvEND (self->incr_text), len, char);
		1975	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		1976	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		1977	}
		1978	}
		1979
		1980	if (GIMME_V != G_VOID)
		1981	do
		1982	{
		1983	char *offset;
		1984
		1985	if (!INCR_DONE (self))
		1986	{
		1987	incr_parse (self);
		1988
		1989	if (self->incr_pos > self->max_size && self->max_size)
		1990	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1991	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		1992
		1993	if (!INCR_DONE (self))
		1994	break;
		1995	}
		1996
		1997	XPUSHs (decode_json (self->incr_text, self, &offset));
		1998
		1999	self->incr_pos -= offset - SvPVX (self->incr_text);
		2000	self->incr_nest = 0;
		2001	self->incr_mode = 0;
		2002
		2003	sv_chop (self->incr_text, offset);
		2004	}
		2005	while (GIMME_V == G_ARRAY);
		2006	}
		2007
		2008	SV *incr_text (JSON *self)
		2009	ATTRS: lvalue
		2010	CODE:
		2011	{
		2012	if (self->incr_pos)
		2013	croak ("incr_text can not be called when the incremental parser already started parsing");
		2014
		2015	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		2016	}
		2017	OUTPUT:
		2018	RETVAL
		2019
		2020	void incr_skip (JSON *self)
		2021	CODE:
		2022	{
		2023	if (self->incr_pos)
		2024	{
		2025	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2026	self->incr_pos = 0;
		2027	self->incr_nest = 0;
		2028	self->incr_mode = 0;
		2029	}
		2030	}
		2031
		2032	void incr_reset (JSON *self)
		2033	CODE:
		2034	{
		2035	SvREFCNT_dec (self->incr_text);
		2036	self->incr_text = 0;
		2037	self->incr_pos = 0;
		2038	self->incr_nest = 0;
		2039	self->incr_mode = 0;
		2040	}
		2041
		2042	void DESTROY (JSON *self)
		2043	CODE:
		2044	SvREFCNT_dec (self->cb_sk_object);
		2045	SvREFCNT_dec (self->cb_object);
		2046	SvREFCNT_dec (self->incr_text);
975		2047
976	PROTOTYPES: ENABLE	2048	PROTOTYPES: ENABLE
977		2049
978	void to_json (SV *scalar)	2050	void encode_json (SV *scalar)
		2051	ALIAS:
		2052	to_json_ = 0
		2053	encode_json = F_UTF8
979	PPCODE:	2054	PPCODE:
		2055	{
		2056	JSON json;
		2057	json_init (&json);
		2058	json.flags |= ix;
980	XPUSHs (encode_json (scalar, F_UTF8));	2059	XPUSHs (encode_json (scalar, &json));
		2060	}
981		2061
982	void from_json (SV *jsonstr)	2062	void decode_json (SV *jsonstr)
		2063	ALIAS:
		2064	from_json_ = 0
		2065	decode_json = F_UTF8
983	PPCODE:	2066	PPCODE:
		2067	{
		2068	JSON json;
		2069	json_init (&json);
		2070	json.flags |= ix;
984	XPUSHs (decode_json (jsonstr, F_UTF8));	2071	XPUSHs (decode_json (jsonstr, &json, 0));
		2072	}
985		2073

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