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Comparing JSON-XS/XS.xs (file contents):
Revision 1.34 by root, Wed May 23 22:07:13 2007 UTC vs.
Revision 1.117 by root, Fri Oct 25 20:19:57 2013 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"	8	#include <stdio.h>
		9	#include <limits.h>
		10	#include <float.h>
9		11
10	#if defined(__BORLANDC__) || defined(_MSC_VER)	12	#if defined(__BORLANDC__) || defined(_MSC_VER)
11	# define snprintf _snprintf // C compilers have this in stdio.h	13	# define snprintf _snprintf // C compilers have this in stdio.h
12	#endif	14	#endif
13		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
14	#define F_ASCII 0x00000001UL	25	#define F_ASCII 0x00000001UL
15	#define F_LATIN1 0x00000002UL	26	#define F_LATIN1 0x00000002UL
16	#define F_UTF8 0x00000004UL	27	#define F_UTF8 0x00000004UL
17	#define F_INDENT 0x00000008UL	28	#define F_INDENT 0x00000008UL
18	#define F_CANONICAL 0x00000010UL	29	#define F_CANONICAL 0x00000010UL
19	#define F_SPACE_BEFORE 0x00000020UL	30	#define F_SPACE_BEFORE 0x00000020UL
20	#define F_SPACE_AFTER 0x00000040UL	31	#define F_SPACE_AFTER 0x00000040UL
21	#define F_ALLOW_NONREF 0x00000100UL	32	#define F_ALLOW_NONREF 0x00000100UL
22	#define F_SHRINK 0x00000200UL	33	#define F_SHRINK 0x00000200UL
		34	#define F_ALLOW_BLESSED 0x00000400UL
		35	#define F_CONV_BLESSED 0x00000800UL
23	#define F_MAXDEPTH 0xf8000000UL	36	#define F_RELAXED 0x00001000UL
24	#define S_MAXDEPTH 27	37	#define F_ALLOW_UNKNOWN 0x00002000UL
25		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
26	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
27
28	// F_SELFCONVERT? <=> to_json/toJson
29	// F_BLESSED? <=> { $__class__$ => }
30		39
31	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	40	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
32	#define F_DEFAULT (9UL << S_MAXDEPTH)
33		41
34	#define INIT_SIZE 32 // initial scalar size to be allocated	42	#define INIT_SIZE 32 // initial scalar size to be allocated
35	#define INDENT_STEP 3 // spaces per indentation level	43	#define INDENT_STEP 3 // spaces per indentation level
36		44
37	#define SHORT_STRING_LEN 512 // special-case strings of up to this size	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)
38		48
39	#define SB do {	49	#define SB do {
40	#define SE } while (0)	50	#define SE } while (0)
41		51
		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	// the amount of HEs to allocate on the stack, when sorting keys
		78	#define STACK_HES 64
		79
42	static HV *json_stash; // JSON::XS::	80	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		81	static SV *json_true, *json_false;
		82
		83	enum {
		84	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		85	INCR_M_STR, // inside string
		86	INCR_M_BS, // inside backslash
		87	INCR_M_C0, // inside comment in initial whitespace sequence
		88	INCR_M_C1, // inside comment in other places
		89	INCR_M_JSON // outside anything, count nesting
		90	};
		91
		92	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		93
		94	typedef struct {
		95	U32 flags;
		96	U32 max_depth;
		97	STRLEN max_size;
		98
		99	SV *cb_object;
		100	HV *cb_sk_object;
		101
		102	// for the incremental parser
		103	SV *incr_text; // the source text so far
		104	STRLEN incr_pos; // the current offset into the text
		105	int incr_nest; // {[]}-nesting level
		106	unsigned char incr_mode;
		107	} JSON;
		108
		109	INLINE void
		110	json_init (JSON *json)
		111	{
		112	Zero (json, 1, JSON);
		113	json->max_depth = 512;
		114	}
43		115
44	/////////////////////////////////////////////////////////////////////////////	116	/////////////////////////////////////////////////////////////////////////////
45	// utility functions	117	// utility functions
46		118
47	static UV *	119	INLINE SV *
48	SvJSON (SV *sv)	120	get_bool (const char *name)
49	{	121	{
50	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))	122	SV *sv = get_sv (name, 1);
51	croak ("object is not of type JSON::XS");
52		123
53	return &SvUVX (SvRV (sv));	124	SvREADONLY_on (sv);
54	}	125	SvREADONLY_on (SvRV (sv));
55		126
56	static void	127	return sv;
		128	}
		129
		130	INLINE void
57	shrink (SV *sv)	131	shrink (SV *sv)
58	{	132	{
59	sv_utf8_downgrade (sv, 1);	133	sv_utf8_downgrade (sv, 1);
		134
60	if (SvLEN (sv) > SvCUR (sv) + 1)	135	if (SvLEN (sv) > SvCUR (sv) + 1)
61	{	136	{
62	#ifdef SvPV_shrink_to_cur	137	#ifdef SvPV_shrink_to_cur
63	SvPV_shrink_to_cur (sv);	138	SvPV_shrink_to_cur (sv);
64	#elif defined (SvPV_renew)	139	#elif defined (SvPV_renew)
…		…
70	// decode an utf-8 character and return it, or (UV)-1 in	145	// decode an utf-8 character and return it, or (UV)-1 in
71	// case of an error.	146	// case of an error.
72	// we special-case "safe" characters from U+80 .. U+7FF,	147	// we special-case "safe" characters from U+80 .. U+7FF,
73	// but use the very good perl function to parse anything else.	148	// but use the very good perl function to parse anything else.
74	// note that we never call this function for a ascii codepoints	149	// note that we never call this function for a ascii codepoints
75	static UV	150	INLINE UV
76	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)	151	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
77	{	152	{
78	if (s[0] > 0xdf || s[0] < 0xc2)	153	if (expect_true (len >= 2
79	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);	154	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
80	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)	155	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
81	{	156	{
82	*clen = 2;	157	*clen = 2;
83	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);	158	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
84	}	159	}
85	else	160	else
86	{	161	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
87	*clen = (STRLEN)-1;	162	}
88	return (UV)-1;	163
		164	// likewise for encoding, also never called for ascii codepoints
		165	// this function takes advantage of this fact, although current gccs
		166	// seem to optimise the check for >= 0x80 away anyways
		167	INLINE unsigned char *
		168	encode_utf8 (unsigned char *s, UV ch)
		169	{
		170	if (expect_false (ch < 0x000080))
		171	*s++ = ch;
		172	else if (expect_true (ch < 0x000800))
		173	*s++ = 0xc0 | ( ch >> 6),
		174	*s++ = 0x80 | ( ch & 0x3f);
		175	else if ( ch < 0x010000)
		176	*s++ = 0xe0 | ( ch >> 12),
		177	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		178	*s++ = 0x80 | ( ch & 0x3f);
		179	else if ( ch < 0x110000)
		180	*s++ = 0xf0 | ( ch >> 18),
		181	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		182	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		183	*s++ = 0x80 | ( ch & 0x3f);
		184
		185	return s;
		186	}
		187
		188	// convert offset pointer to character index, sv must be string
		189	static STRLEN
		190	ptr_to_index (SV *sv, char *offset)
		191	{
		192	return SvUTF8 (sv)
		193	? utf8_distance (offset, SvPVX (sv))
		194	: offset - SvPVX (sv);
		195	}
		196
		197	/////////////////////////////////////////////////////////////////////////////
		198	// fp hell
		199
		200	// scan a group of digits, and a trailing exponent
		201	static void
		202	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		203	{
		204	UV uaccum = 0;
		205	int eaccum = 0;
		206
		207	// if we recurse too deep, skip all remaining digits
		208	// to avoid a stack overflow attack
		209	if (expect_false (--maxdepth <= 0))
		210	while (((U8)*s - '0') < 10)
		211	++s;
		212
		213	for (;;)
89	}	214	{
90	}	215	U8 dig = (U8)*s - '0';
91		216
		217	if (expect_false (dig >= 10))
		218	{
		219	if (dig == (U8)((U8)'.' - (U8)'0'))
		220	{
		221	++s;
		222	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		223	}
		224	else if ((dig | ' ') == 'e' - '0')
		225	{
		226	int exp2 = 0;
		227	int neg = 0;
		228
		229	++s;
		230
		231	if (*s == '-')
		232	{
		233	++s;
		234	neg = 1;
		235	}
		236	else if (*s == '+')
		237	++s;
		238
		239	while ((dig = (U8)*s - '0') < 10)
		240	exp2 = exp2 * 10 + *s++ - '0';
		241
		242	*expo += neg ? -exp2 : exp2;
		243	}
		244
		245	break;
		246	}
		247
		248	++s;
		249
		250	uaccum = uaccum * 10 + dig;
		251	++eaccum;
		252
		253	// if we have too many digits, then recurse for more
		254	// we actually do this for rather few digits
		255	if (uaccum >= (UV_MAX - 9) / 10)
		256	{
		257	if (postdp) *expo -= eaccum;
		258	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		259	if (postdp) *expo += eaccum;
		260
		261	break;
		262	}
		263	}
		264
		265	// this relies greatly on the quality of the pow ()
		266	// implementation of the platform, but a good
		267	// implementation is hard to beat.
		268	// (IEEE 754 conformant ones are required to be exact)
		269	if (postdp) *expo -= eaccum;
		270	*accum += uaccum * Perl_pow (10., *expo);
		271	*expo += eaccum;
		272	}
		273
		274	static NV
		275	json_atof (const char *s)
		276	{
		277	NV accum = 0.;
		278	int expo = 0;
		279	int neg = 0;
		280
		281	if (*s == '-')
		282	{
		283	++s;
		284	neg = 1;
		285	}
		286
		287	// a recursion depth of ten gives us >>500 bits
		288	json_atof_scan1 (s, &accum, &expo, 0, 10);
		289
		290	return neg ? -accum : accum;
		291	}
92	/////////////////////////////////////////////////////////////////////////////	292	/////////////////////////////////////////////////////////////////////////////
93	// encoder	293	// encoder
94		294
95	// structure used for encoding JSON	295	// structure used for encoding JSON
96	typedef struct	296	typedef struct
97	{	297	{
98	char *cur; // SvPVX (sv) + current output position	298	char *cur; // SvPVX (sv) + current output position
99	char *end; // SvEND (sv)	299	char *end; // SvEND (sv)
100	SV *sv; // result scalar	300	SV *sv; // result scalar
101	U32 flags; // F_*	301	JSON json;
102	U32 indent; // indentation level	302	U32 indent; // indentation level
103	U32 maxdepth; // max. indentation/recursion level	303	UV limit; // escape character values >= this value when encoding
104	} enc_t;	304	} enc_t;
105		305
106	static void	306	INLINE void
107	need (enc_t *enc, STRLEN len)	307	need (enc_t *enc, STRLEN len)
108	{	308	{
109	if (enc->cur + len >= enc->end)	309	if (expect_false (enc->cur + len >= enc->end))
110	{	310	{
111	STRLEN cur = enc->cur - SvPVX (enc->sv);	311	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
112	SvGROW (enc->sv, cur + len + 1);	312	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
113	enc->cur = SvPVX (enc->sv) + cur;	313	enc->cur = SvPVX (enc->sv) + cur;
114	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;	314	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
115	}	315	}
116	}	316	}
117		317
118	static void	318	INLINE void
119	encode_ch (enc_t *enc, char ch)	319	encode_ch (enc_t *enc, char ch)
120	{	320	{
121	need (enc, 1);	321	need (enc, 1);
122	*enc->cur++ = ch;	322	*enc->cur++ = ch;
123	}	323	}
…		…
131		331
132	while (str < end)	332	while (str < end)
133	{	333	{
134	unsigned char ch = *(unsigned char *)str;	334	unsigned char ch = *(unsigned char *)str;
135		335
136	if (ch >= 0x20 && ch < 0x80) // most common case	336	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
137	{	337	{
138	if (ch == '"') // but with slow exceptions	338	if (expect_false (ch == '"')) // but with slow exceptions
139	{	339	{
140	need (enc, len += 1);	340	need (enc, len += 1);
141	*enc->cur++ = '\\';	341	*enc->cur++ = '\\';
142	*enc->cur++ = '"';	342	*enc->cur++ = '"';
143	}	343	}
144	else if (ch == '\\')	344	else if (expect_false (ch == '\\'))
145	{	345	{
146	need (enc, len += 1);	346	need (enc, len += 1);
147	*enc->cur++ = '\\';	347	*enc->cur++ = '\\';
148	*enc->cur++ = '\\';	348	*enc->cur++ = '\\';
149	}	349	}
…		…
167	STRLEN clen;	367	STRLEN clen;
168	UV uch;	368	UV uch;
169		369
170	if (is_utf8)	370	if (is_utf8)
171	{	371	{
172	//uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
173	uch = decode_utf8 (str, end - str, &clen);	372	uch = decode_utf8 (str, end - str, &clen);
174	if (clen == (STRLEN)-1)	373	if (clen == (STRLEN)-1)
175	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	374	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
176	}	375	}
177	else	376	else
178	{	377	{
179	uch = ch;	378	uch = ch;
180	clen = 1;	379	clen = 1;
181	}	380	}
182		381
183	if (uch > 0x10FFFFUL)	382	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
184	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
185
186	if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
187	{	383	{
188	if (uch > 0xFFFFUL)	384	if (uch >= 0x10000UL)
189	{	385	{
		386	if (uch >= 0x110000UL)
		387	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		388
190	need (enc, len += 11);	389	need (enc, len += 11);
191	sprintf (enc->cur, "\\u%04x\\u%04x",	390	sprintf (enc->cur, "\\u%04x\\u%04x",
192	(int)((uch - 0x10000) / 0x400 + 0xD800),	391	(int)((uch - 0x10000) / 0x400 + 0xD800),
193	(int)((uch - 0x10000) % 0x400 + 0xDC00));	392	(int)((uch - 0x10000) % 0x400 + 0xDC00));
194	enc->cur += 12;	393	enc->cur += 12;
195	}	394	}
196	else	395	else
197	{	396	{
198	static char hexdigit [16] = "0123456789abcdef";
199	need (enc, len += 5);	397	need (enc, len += 5);
200	*enc->cur++ = '\\';	398	*enc->cur++ = '\\';
201	*enc->cur++ = 'u';	399	*enc->cur++ = 'u';
202	*enc->cur++ = hexdigit [ uch >> 12 ];	400	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
203	*enc->cur++ = hexdigit [(uch >> 8) & 15];	401	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
204	*enc->cur++ = hexdigit [(uch >> 4) & 15];	402	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
205	*enc->cur++ = hexdigit [(uch >> 0) & 15];	403	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
206	}	404	}
207		405
208	str += clen;	406	str += clen;
209	}	407	}
210	else if (enc->flags & F_LATIN1)	408	else if (enc->json.flags & F_LATIN1)
211	{	409	{
212	*enc->cur++ = uch;	410	*enc->cur++ = uch;
213	str += clen;	411	str += clen;
214	}	412	}
215	else if (is_utf8)	413	else if (is_utf8)
…		…
222	while (--clen);	420	while (--clen);
223	}	421	}
224	else	422	else
225	{	423	{
226	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed	424	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
227	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	425	enc->cur = encode_utf8 (enc->cur, uch);
228	++str;	426	++str;
229	}	427	}
230	}	428	}
231	}	429	}
232	}	430	}
233		431
234	--len;	432	--len;
235	}	433	}
236	}	434	}
237		435
238	static void	436	INLINE void
239	encode_indent (enc_t *enc)	437	encode_indent (enc_t *enc)
240	{	438	{
241	if (enc->flags & F_INDENT)	439	if (enc->json.flags & F_INDENT)
242	{	440	{
243	int spaces = enc->indent * INDENT_STEP;	441	int spaces = enc->indent * INDENT_STEP;
244		442
245	need (enc, spaces);	443	need (enc, spaces);
246	memset (enc->cur, ' ', spaces);	444	memset (enc->cur, ' ', spaces);
247	enc->cur += spaces;	445	enc->cur += spaces;
248	}	446	}
249	}	447	}
250		448
251	static void	449	INLINE void
252	encode_space (enc_t *enc)	450	encode_space (enc_t *enc)
253	{	451	{
254	need (enc, 1);	452	need (enc, 1);
255	encode_ch (enc, ' ');	453	encode_ch (enc, ' ');
256	}	454	}
257		455
258	static void	456	INLINE void
259	encode_nl (enc_t *enc)	457	encode_nl (enc_t *enc)
260	{	458	{
261	if (enc->flags & F_INDENT)	459	if (enc->json.flags & F_INDENT)
262	{	460	{
263	need (enc, 1);	461	need (enc, 1);
264	encode_ch (enc, '\n');	462	encode_ch (enc, '\n');
265	}	463	}
266	}	464	}
267		465
268	static void	466	INLINE void
269	encode_comma (enc_t *enc)	467	encode_comma (enc_t *enc)
270	{	468	{
271	encode_ch (enc, ',');	469	encode_ch (enc, ',');
272		470
273	if (enc->flags & F_INDENT)	471	if (enc->json.flags & F_INDENT)
274	encode_nl (enc);	472	encode_nl (enc);
275	else if (enc->flags & F_SPACE_AFTER)	473	else if (enc->json.flags & F_SPACE_AFTER)
276	encode_space (enc);	474	encode_space (enc);
277	}	475	}
278		476
279	static void encode_sv (enc_t *enc, SV *sv);	477	static void encode_sv (enc_t *enc, SV *sv);
280		478
281	static void	479	static void
282	encode_av (enc_t *enc, AV *av)	480	encode_av (enc_t *enc, AV *av)
283	{	481	{
284	int i, len = av_len (av);	482	int i, len = av_len (av);
285		483
286	if (enc->indent >= enc->maxdepth)	484	if (enc->indent >= enc->json.max_depth)
287	croak ("data structure too deep (hit recursion limit)");	485	croak (ERR_NESTING_EXCEEDED);
288		486
289	encode_ch (enc, '['); encode_nl (enc);	487	encode_ch (enc, '[');
290	++enc->indent;
291		488
		489	if (len >= 0)
		490	{
		491	encode_nl (enc); ++enc->indent;
		492
292	for (i = 0; i <= len; ++i)	493	for (i = 0; i <= len; ++i)
293	{	494	{
		495	SV **svp = av_fetch (av, i, 0);
		496
294	encode_indent (enc);	497	encode_indent (enc);
295	encode_sv (enc, *av_fetch (av, i, 0));
296		498
		499	if (svp)
		500	encode_sv (enc, *svp);
		501	else
		502	encode_str (enc, "null", 4, 0);
		503
297	if (i < len)	504	if (i < len)
298	encode_comma (enc);	505	encode_comma (enc);
299	}	506	}
300		507
		508	encode_nl (enc); --enc->indent; encode_indent (enc);
		509	}
		510
301	encode_nl (enc);	511	encode_ch (enc, ']');
302
303	--enc->indent;
304	encode_indent (enc); encode_ch (enc, ']');
305	}	512	}
306		513
307	static void	514	static void
308	encode_he (enc_t *enc, HE *he)	515	encode_hk (enc_t *enc, HE *he)
309	{	516	{
310	encode_ch (enc, '"');	517	encode_ch (enc, '"');
311		518
312	if (HeKLEN (he) == HEf_SVKEY)	519	if (HeKLEN (he) == HEf_SVKEY)
313	{	520	{
314	SV *sv = HeSVKEY (he);	521	SV *sv = HeSVKEY (he);
315	STRLEN len;	522	STRLEN len;
316	char *str;	523	char *str;
317		524
318	SvGETMAGIC (sv);	525	SvGETMAGIC (sv);
319	str = SvPV (sv, len);	526	str = SvPV (sv, len);
320		527
321	encode_str (enc, str, len, SvUTF8 (sv));	528	encode_str (enc, str, len, SvUTF8 (sv));
322	}	529	}
323	else	530	else
324	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	531	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
325		532
326	encode_ch (enc, '"');	533	encode_ch (enc, '"');
327		534
328	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	535	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
329	encode_ch (enc, ':');	536	encode_ch (enc, ':');
330	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	537	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
331	encode_sv (enc, HeVAL (he));
332	}	538	}
333		539
334	// compare hash entries, used when all keys are bytestrings	540	// compare hash entries, used when all keys are bytestrings
335	static int	541	static int
336	he_cmp_fast (const void *a_, const void *b_)	542	he_cmp_fast (const void *a_, const void *b_)
…		…
341	HE *b = *(HE **)b_;	547	HE *b = *(HE **)b_;
342		548
343	STRLEN la = HeKLEN (a);	549	STRLEN la = HeKLEN (a);
344	STRLEN lb = HeKLEN (b);	550	STRLEN lb = HeKLEN (b);
345		551
346	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	552	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
347	cmp = la - lb;	553	cmp = lb - la;
348		554
349	return cmp;	555	return cmp;
350	}	556	}
351		557
352	// compare hash entries, used when some keys are sv's or utf-x	558	// compare hash entries, used when some keys are sv's or utf-x
353	static int	559	static int
354	he_cmp_slow (const void *a, const void *b)	560	he_cmp_slow (const void *a, const void *b)
355	{	561	{
356	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	562	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
357	}	563	}
358		564
359	static void	565	static void
360	encode_hv (enc_t *enc, HV *hv)	566	encode_hv (enc_t *enc, HV *hv)
361	{	567	{
362	int count, i;	568	HE *he;
363		569
364	if (enc->indent >= enc->maxdepth)	570	if (enc->indent >= enc->json.max_depth)
365	croak ("data structure too deep (hit recursion limit)");	571	croak (ERR_NESTING_EXCEEDED);
366		572
367	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	573	encode_ch (enc, '{');
368		574
369	if ((count = hv_iterinit (hv)))
370	{
371	// for canonical output we have to sort by keys first	575	// for canonical output we have to sort by keys first
372	// actually, this is mostly due to the stupid so-called	576	// actually, this is mostly due to the stupid so-called
373	// security workaround added somewhere in 5.8.x.	577	// security workaround added somewhere in 5.8.x
374	// that randomises hash orderings	578	// that randomises hash orderings
375	if (enc->flags & F_CANONICAL)	579	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		580	{
		581	int count = hv_iterinit (hv);
		582
		583	if (SvMAGICAL (hv))
376	{	584	{
		585	// need to count by iterating. could improve by dynamically building the vector below
		586	// but I don't care for the speed of this special case.
		587	// note also that we will run into undefined behaviour when the two iterations
		588	// do not result in the same count, something I might care for in some later release.
		589
		590	count = 0;
		591	while (hv_iternext (hv))
		592	++count;
		593
		594	hv_iterinit (hv);
		595	}
		596
		597	if (count)
		598	{
377	int fast = 1;	599	int i, fast = 1;
378	HE *he;	600	HE *hes_stack [STACK_HES];
379	#if defined(__BORLANDC__) || defined(_MSC_VER)	601	HE **hes = hes_stack;
380	HE **hes = _alloca (count * sizeof (HE));	602
381	#else	603	// allocate larger arrays on the heap
382	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode	604	if (count > STACK_HES)
383	#endif	605	{
		606	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		607	hes = (HE **)SvPVX (sv);
		608	}
384		609
385	i = 0;	610	i = 0;
386	while ((he = hv_iternext (hv)))	611	while ((he = hv_iternext (hv)))
387	{	612	{
388	hes [i++] = he;	613	hes [i++] = he;
…		…
410		635
411	FREETMPS;	636	FREETMPS;
412	LEAVE;	637	LEAVE;
413	}	638	}
414		639
415	for (i = 0; i < count; ++i)	640	encode_nl (enc); ++enc->indent;
		641
		642	while (count--)
416	{	643	{
417	encode_indent (enc);	644	encode_indent (enc);
		645	he = hes [count];
418	encode_he (enc, hes [i]);	646	encode_hk (enc, he);
		647	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
419		648
420	if (i < count - 1)	649	if (count)
421	encode_comma (enc);	650	encode_comma (enc);
422	}	651	}
423		652
		653	encode_nl (enc); --enc->indent; encode_indent (enc);
		654	}
		655	}
		656	else
		657	{
		658	if (hv_iterinit (hv) || SvMAGICAL (hv))
		659	if ((he = hv_iternext (hv)))
		660	{
		661	encode_nl (enc); ++enc->indent;
		662
		663	for (;;)
		664	{
424	encode_nl (enc);	665	encode_indent (enc);
		666	encode_hk (enc, he);
		667	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		668
		669	if (!(he = hv_iternext (hv)))
		670	break;
		671
		672	encode_comma (enc);
		673	}
		674
		675	encode_nl (enc); --enc->indent; encode_indent (enc);
		676	}
		677	}
		678
		679	encode_ch (enc, '}');
		680	}
		681
		682	// encode objects, arrays and special \0=false and \1=true values.
		683	static void
		684	encode_rv (enc_t *enc, SV *sv)
		685	{
		686	svtype svt;
		687
		688	SvGETMAGIC (sv);
		689	svt = SvTYPE (sv);
		690
		691	if (expect_false (SvOBJECT (sv)))
		692	{
		693	HV *stash = !JSON_SLOW || json_boolean_stash
		694	? json_boolean_stash
		695	: gv_stashpv ("JSON::XS::Boolean", 1);
		696
		697	if (SvSTASH (sv) == stash)
		698	{
		699	if (SvIV (sv))
		700	encode_str (enc, "true", 4, 0);
		701	else
		702	encode_str (enc, "false", 5, 0);
425	}	703	}
426	else	704	else
427	{	705	{
428	HE *he = hv_iternext (hv);	706	#if 0
429		707	if (0 && sv_derived_from (rv, "JSON::Literal"))
430	for (;;)
431	{
432	encode_indent (enc);
433	encode_he (enc, he);
434
435	if (!(he = hv_iternext (hv)))
436	break;
437
438	encode_comma (enc);
439	}	708	{
		709	// not yet
		710	}
		711	#endif
		712	if (enc->json.flags & F_CONV_BLESSED)
		713	{
		714	// we re-bless the reference to get overload and other niceties right
		715	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
440		716
		717	if (to_json)
		718	{
		719	dSP;
		720
		721	ENTER; SAVETMPS; PUSHMARK (SP);
		722	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		723
		724	// calling with G_SCALAR ensures that we always get a 1 return value
		725	PUTBACK;
		726	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		727	SPAGAIN;
		728
		729	// catch this surprisingly common error
		730	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		731	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		732
		733	sv = POPs;
		734	PUTBACK;
		735
441	encode_nl (enc);	736	encode_sv (enc, sv);
		737
		738	FREETMPS; LEAVE;
		739	}
		740	else if (enc->json.flags & F_ALLOW_BLESSED)
		741	encode_str (enc, "null", 4, 0);
		742	else
		743	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		744	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		745	}
		746	else if (enc->json.flags & F_ALLOW_BLESSED)
		747	encode_str (enc, "null", 4, 0);
		748	else
		749	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		750	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
442	}	751	}
443	}	752	}
444
445	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
446	}
447
448	// encode objects, arrays and special \0=false and \1=true values.
449	static void
450	encode_rv (enc_t *enc, SV *sv)
451	{
452	svtype svt;
453
454	SvGETMAGIC (sv);
455	svt = SvTYPE (sv);
456
457	if (svt == SVt_PVHV)	753	else if (svt == SVt_PVHV)
458	encode_hv (enc, (HV *)sv);	754	encode_hv (enc, (HV *)sv);
459	else if (svt == SVt_PVAV)	755	else if (svt == SVt_PVAV)
460	encode_av (enc, (AV *)sv);	756	encode_av (enc, (AV *)sv);
461	else if (svt < SVt_PVAV)	757	else if (svt < SVt_PVAV)
462	{	758	{
463	if (SvNIOK (sv) && SvIV (sv) == 0)	759	STRLEN len = 0;
		760	char *pv = svt ? SvPV (sv, len) : 0;
		761
		762	if (len == 1 && *pv == '1')
		763	encode_str (enc, "true", 4, 0);
		764	else if (len == 1 && *pv == '0')
464	encode_str (enc, "false", 5, 0);	765	encode_str (enc, "false", 5, 0);
465	else if (SvNIOK (sv) && SvIV (sv) == 1)	766	else if (enc->json.flags & F_ALLOW_UNKNOWN)
466	encode_str (enc, "true", 4, 0);	767	encode_str (enc, "null", 4, 0);
467	else	768	else
468	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",	769	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
469	SvPV_nolen (sv_2mortal (newRV_inc (sv))));	770	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
470	}	771	}
		772	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		773	encode_str (enc, "null", 4, 0);
471	else	774	else
472	croak ("encountered %s, but JSON can only represent references to arrays or hashes",	775	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
473	SvPV_nolen (sv_2mortal (newRV_inc (sv))));	776	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
474	}	777	}
475		778
…		…
486	encode_str (enc, str, len, SvUTF8 (sv));	789	encode_str (enc, str, len, SvUTF8 (sv));
487	encode_ch (enc, '"');	790	encode_ch (enc, '"');
488	}	791	}
489	else if (SvNOKp (sv))	792	else if (SvNOKp (sv))
490	{	793	{
		794	// trust that perl will do the right thing w.r.t. JSON syntax.
491	need (enc, NV_DIG + 32);	795	need (enc, NV_DIG + 32);
492	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	796	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
493	enc->cur += strlen (enc->cur);	797	enc->cur += strlen (enc->cur);
494	}	798	}
495	else if (SvIOKp (sv))	799	else if (SvIOKp (sv))
496	{	800	{
		801	// we assume we can always read an IV as a UV and vice versa
		802	// we assume two's complement
		803	// we assume no aliasing issues in the union
		804	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		805	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		806	{
		807	// optimise the "small number case"
		808	// code will likely be branchless and use only a single multiplication
		809	// works for numbers up to 59074
		810	I32 i = SvIVX (sv);
		811	U32 u;
		812	char digit, nz = 0;
		813
497	need (enc, 64);	814	need (enc, 6);
		815
		816	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		817	u = i < 0 ? -i : i;
		818
		819	// convert to 4.28 fixed-point representation
		820	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		821
		822	// now output digit by digit, each time masking out the integer part
		823	// and multiplying by 5 while moving the decimal point one to the right,
		824	// resulting in a net multiplication by 10.
		825	// we always write the digit to memory but conditionally increment
		826	// the pointer, to enable the use of conditional move instructions.
		827	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		828	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		829	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		830	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		831	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		832	}
		833	else
		834	{
		835	// large integer, use the (rather slow) snprintf way.
		836	need (enc, IVUV_MAXCHARS);
498	enc->cur +=	837	enc->cur +=
499	SvIsUV(sv)	838	SvIsUV(sv)
500	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	839	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
501	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	840	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		841	}
502	}	842	}
503	else if (SvROK (sv))	843	else if (SvROK (sv))
504	encode_rv (enc, SvRV (sv));	844	encode_rv (enc, SvRV (sv));
505	else if (!SvOK (sv))	845	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
506	encode_str (enc, "null", 4, 0);	846	encode_str (enc, "null", 4, 0);
507	else	847	else
508	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	848	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
509	SvPV_nolen (sv), SvFLAGS (sv));	849	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
510	}	850	}
511		851
512	static SV *	852	static SV *
513	encode_json (SV *scalar, U32 flags)	853	encode_json (SV *scalar, JSON *json)
514	{	854	{
515	enc_t enc;	855	enc_t enc;
516		856
517	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	857	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
518	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	858	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
519		859
520	enc.flags = flags;	860	enc.json = *json;
521	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	861	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
522	enc.cur = SvPVX (enc.sv);	862	enc.cur = SvPVX (enc.sv);
523	enc.end = SvEND (enc.sv);	863	enc.end = SvEND (enc.sv);
524	enc.indent = 0;	864	enc.indent = 0;
525	enc.maxdepth = DEC_DEPTH (flags);	865	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		866	: enc.json.flags & F_LATIN1 ? 0x000100UL
		867	: 0x110000UL;
526		868
527	SvPOK_only (enc.sv);	869	SvPOK_only (enc.sv);
528	encode_sv (&enc, scalar);	870	encode_sv (&enc, scalar);
		871	encode_nl (&enc);
529		872
530	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	873	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
531	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings	874	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
532		875
533	if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))	876	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
534	SvUTF8_on (enc.sv);	877	SvUTF8_on (enc.sv);
535		878
536	if (enc.flags & F_SHRINK)	879	if (enc.json.flags & F_SHRINK)
537	shrink (enc.sv);	880	shrink (enc.sv);
538		881
539	return enc.sv;	882	return enc.sv;
540	}	883	}
541		884
…		…
546	typedef struct	889	typedef struct
547	{	890	{
548	char *cur; // current parser pointer	891	char *cur; // current parser pointer
549	char *end; // end of input string	892	char *end; // end of input string
550	const char *err; // parse error, if != 0	893	const char *err; // parse error, if != 0
551	U32 flags; // F_*	894	JSON json;
552	U32 depth; // recursion depth	895	U32 depth; // recursion depth
553	U32 maxdepth; // recursion depth limit	896	U32 maxdepth; // recursion depth limit
554	} dec_t;	897	} dec_t;
555		898
556	static void	899	INLINE void
		900	decode_comment (dec_t *dec)
		901	{
		902	// only '#'-style comments allowed a.t.m.
		903
		904	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		905	++dec->cur;
		906	}
		907
		908	INLINE void
557	decode_ws (dec_t *dec)	909	decode_ws (dec_t *dec)
558	{	910	{
559	for (;;)	911	for (;;)
560	{	912	{
561	char ch = *dec->cur;	913	char ch = *dec->cur;
562		914
563	if (ch > 0x20	915	if (ch > 0x20)
		916	{
		917	if (expect_false (ch == '#'))
		918	{
		919	if (dec->json.flags & F_RELAXED)
		920	decode_comment (dec);
		921	else
		922	break;
		923	}
		924	else
		925	break;
		926	}
564	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	927	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
565	break;	928	break; // parse error, but let higher level handle it, gives better error messages
566		929
567	++dec->cur;	930	++dec->cur;
568	}	931	}
569	}	932	}
570		933
…		…
574	if (*dec->cur != ch) \	937	if (*dec->cur != ch) \
575	ERR (# ch " expected"); \	938	ERR (# ch " expected"); \
576	++dec->cur; \	939	++dec->cur; \
577	SE	940	SE
578		941
579	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")	942	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
580	#define DEC_DEC_DEPTH --dec->depth	943	#define DEC_DEC_DEPTH --dec->depth
581		944
582	static SV *decode_sv (dec_t *dec);	945	static SV *decode_sv (dec_t *dec);
583		946
584	static signed char decode_hexdigit[256];	947	static signed char decode_hexdigit[256];
…		…
587	decode_4hex (dec_t *dec)	950	decode_4hex (dec_t *dec)
588	{	951	{
589	signed char d1, d2, d3, d4;	952	signed char d1, d2, d3, d4;
590	unsigned char *cur = (unsigned char *)dec->cur;	953	unsigned char *cur = (unsigned char *)dec->cur;
591		954
592	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	955	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
593	d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected");	956	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
594	d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected");	957	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
595	d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected");	958	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
596		959
597	dec->cur += 4;	960	dec->cur += 4;
598		961
599	return ((UV)d1) << 12	962	return ((UV)d1) << 12
600	| ((UV)d2) << 8	963	| ((UV)d2) << 8
…		…
608	static SV *	971	static SV *
609	decode_str (dec_t *dec)	972	decode_str (dec_t *dec)
610	{	973	{
611	SV *sv = 0;	974	SV *sv = 0;
612	int utf8 = 0;	975	int utf8 = 0;
		976	char *dec_cur = dec->cur;
613		977
614	do	978	do
615	{	979	{
616	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];	980	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
617	char *cur = buf;	981	char *cur = buf;
618		982
619	do	983	do
620	{	984	{
621	unsigned char ch = *(unsigned char *)dec->cur++;	985	unsigned char ch = *(unsigned char *)dec_cur++;
622		986
623	if (ch == '"')	987	if (expect_false (ch == '"'))
624	{	988	{
625	--dec->cur;	989	--dec_cur;
626	break;	990	break;
627	}	991	}
628	else if (ch == '\\')	992	else if (expect_false (ch == '\\'))
629	{	993	{
630	switch (*dec->cur)	994	switch (*dec_cur)
631	{	995	{
632	case '\\':	996	case '\\':
633	case '/':	997	case '/':
634	case '"': *cur++ = *dec->cur++; break;	998	case '"': *cur++ = *dec_cur++; break;
635		999
636	case 'b': ++dec->cur; *cur++ = '\010'; break;	1000	case 'b': ++dec_cur; *cur++ = '\010'; break;
637	case 't': ++dec->cur; *cur++ = '\011'; break;	1001	case 't': ++dec_cur; *cur++ = '\011'; break;
638	case 'n': ++dec->cur; *cur++ = '\012'; break;	1002	case 'n': ++dec_cur; *cur++ = '\012'; break;
639	case 'f': ++dec->cur; *cur++ = '\014'; break;	1003	case 'f': ++dec_cur; *cur++ = '\014'; break;
640	case 'r': ++dec->cur; *cur++ = '\015'; break;	1004	case 'r': ++dec_cur; *cur++ = '\015'; break;
641		1005
642	case 'u':	1006	case 'u':
643	{	1007	{
644	UV lo, hi;	1008	UV lo, hi;
645	++dec->cur;	1009	++dec_cur;
646		1010
		1011	dec->cur = dec_cur;
647	hi = decode_4hex (dec);	1012	hi = decode_4hex (dec);
		1013	dec_cur = dec->cur;
648	if (hi == (UV)-1)	1014	if (hi == (UV)-1)
649	goto fail;	1015	goto fail;
650		1016
651	// possibly a surrogate pair	1017	// possibly a surrogate pair
652	if (hi >= 0xd800)	1018	if (hi >= 0xd800)
653	if (hi < 0xdc00)	1019	if (hi < 0xdc00)
654	{	1020	{
655	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1021	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
656	ERR ("missing low surrogate character in surrogate pair");	1022	ERR ("missing low surrogate character in surrogate pair");
657		1023
658	dec->cur += 2;	1024	dec_cur += 2;
659		1025
		1026	dec->cur = dec_cur;
660	lo = decode_4hex (dec);	1027	lo = decode_4hex (dec);
		1028	dec_cur = dec->cur;
661	if (lo == (UV)-1)	1029	if (lo == (UV)-1)
662	goto fail;	1030	goto fail;
663		1031
664	if (lo < 0xdc00 || lo >= 0xe000)	1032	if (lo < 0xdc00 || lo >= 0xe000)
665	ERR ("surrogate pair expected");	1033	ERR ("surrogate pair expected");
…		…
671		1039
672	if (hi >= 0x80)	1040	if (hi >= 0x80)
673	{	1041	{
674	utf8 = 1;	1042	utf8 = 1;
675		1043
676	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);	1044	cur = encode_utf8 (cur, hi);
677	}	1045	}
678	else	1046	else
679	*cur++ = hi;	1047	*cur++ = hi;
680	}	1048	}
681	break;	1049	break;
682		1050
683	default:	1051	default:
684	--dec->cur;	1052	--dec_cur;
685	ERR ("illegal backslash escape sequence in string");	1053	ERR ("illegal backslash escape sequence in string");
686	}	1054	}
687	}	1055	}
688	else if (ch >= 0x20 && ch <= 0x7f)	1056	else if (expect_true (ch >= 0x20 && ch < 0x80))
689	*cur++ = ch;	1057	*cur++ = ch;
690	else if (ch >= 0x80)	1058	else if (ch >= 0x80)
691	{	1059	{
692	STRLEN clen;	1060	STRLEN clen;
693	UV uch;
694		1061
695	--dec->cur;	1062	--dec_cur;
696		1063
697	uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);	1064	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
698	if (clen == (STRLEN)-1)	1065	if (clen == (STRLEN)-1)
699	ERR ("malformed UTF-8 character in JSON string");	1066	ERR ("malformed UTF-8 character in JSON string");
700		1067
701	do	1068	do
702	*cur++ = *dec->cur++;	1069	*cur++ = *dec_cur++;
703	while (--clen);	1070	while (--clen);
704		1071
705	utf8 = 1;	1072	utf8 = 1;
706	}	1073	}
707	else	1074	else
708	{	1075	{
709	--dec->cur;	1076	--dec_cur;
710		1077
711	if (!ch)	1078	if (!ch)
712	ERR ("unexpected end of string while parsing JSON string");	1079	ERR ("unexpected end of string while parsing JSON string");
713	else	1080	else
714	ERR ("invalid character encountered while parsing JSON string");	1081	ERR ("invalid character encountered while parsing JSON string");
…		…
719	{	1086	{
720	STRLEN len = cur - buf;	1087	STRLEN len = cur - buf;
721		1088
722	if (sv)	1089	if (sv)
723	{	1090	{
724	SvGROW (sv, SvCUR (sv) + len + 1);	1091	STRLEN cur = SvCUR (sv);
		1092
		1093	if (SvLEN (sv) <= cur + len)
		1094	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1095
725	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	1096	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
726	SvCUR_set (sv, SvCUR (sv) + len);	1097	SvCUR_set (sv, SvCUR (sv) + len);
727	}	1098	}
728	else	1099	else
729	sv = newSVpvn (buf, len);	1100	sv = newSVpvn (buf, len);
730	}	1101	}
731	}	1102	}
732	while (*dec->cur != '"');	1103	while (*dec_cur != '"');
733		1104
734	++dec->cur;	1105	++dec_cur;
735		1106
736	if (sv)	1107	if (sv)
737	{	1108	{
738	SvPOK_only (sv);	1109	SvPOK_only (sv);
739	*SvEND (sv) = 0;	1110	*SvEND (sv) = 0;
…		…
742	SvUTF8_on (sv);	1113	SvUTF8_on (sv);
743	}	1114	}
744	else	1115	else
745	sv = newSVpvn ("", 0);	1116	sv = newSVpvn ("", 0);
746		1117
		1118	dec->cur = dec_cur;
747	return sv;	1119	return sv;
748		1120
749	fail:	1121	fail:
		1122	dec->cur = dec_cur;
750	return 0;	1123	return 0;
751	}	1124	}
752		1125
753	static SV *	1126	static SV *
754	decode_num (dec_t *dec)	1127	decode_num (dec_t *dec)
…		…
812	is_nv = 1;	1185	is_nv = 1;
813	}	1186	}
814		1187
815	if (!is_nv)	1188	if (!is_nv)
816	{	1189	{
817	UV uv;	1190	int len = dec->cur - start;
818	int numtype = grok_number (start, dec->cur - start, &uv);	1191
819	if (numtype & IS_NUMBER_IN_UV)	1192	// special case the rather common 1..5-digit-int case
820	if (numtype & IS_NUMBER_NEG)	1193	if (*start == '-')
		1194	switch (len)
821	{	1195	{
822	if (uv < (UV)IV_MIN)	1196	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
823	return newSViv (-(IV)uv);	1197	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1198	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1199	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1200	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
824	}	1201	}
		1202	else
		1203	switch (len)
		1204	{
		1205	case 1: return newSViv ( start [0] - '0' * 1);
		1206	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1207	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1208	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1209	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1210	}
		1211
		1212	{
		1213	UV uv;
		1214	int numtype = grok_number (start, len, &uv);
		1215	if (numtype & IS_NUMBER_IN_UV)
		1216	if (numtype & IS_NUMBER_NEG)
		1217	{
		1218	if (uv < (UV)IV_MIN)
		1219	return newSViv (-(IV)uv);
		1220	}
825	else	1221	else
826	return newSVuv (uv);	1222	return newSVuv (uv);
827	}	1223	}
828		1224
		1225	len -= *start == '-' ? 1 : 0;
		1226
		1227	// does not fit into IV or UV, try NV
		1228	if (len <= NV_DIG)
		1229	// fits into NV without loss of precision
		1230	return newSVnv (json_atof (start));
		1231
		1232	// everything else fails, convert it to a string
		1233	return newSVpvn (start, dec->cur - start);
		1234	}
		1235
		1236	// loss of precision here
829	return newSVnv (Atof (start));	1237	return newSVnv (json_atof (start));
830		1238
831	fail:	1239	fail:
832	return 0;	1240	return 0;
833	}	1241	}
834		1242
…		…
858	if (*dec->cur == ']')	1266	if (*dec->cur == ']')
859	{	1267	{
860	++dec->cur;	1268	++dec->cur;
861	break;	1269	break;
862	}	1270	}
863		1271
864	if (*dec->cur != ',')	1272	if (*dec->cur != ',')
865	ERR (", or ] expected while parsing array");	1273	ERR (", or ] expected while parsing array");
866		1274
867	++dec->cur;	1275	++dec->cur;
		1276
		1277	decode_ws (dec);
		1278
		1279	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1280	{
		1281	++dec->cur;
		1282	break;
		1283	}
868	}	1284	}
869		1285
870	DEC_DEC_DEPTH;	1286	DEC_DEC_DEPTH;
871	return newRV_noinc ((SV *)av);	1287	return newRV_noinc ((SV *)av);
872		1288
…		…
877	}	1293	}
878		1294
879	static SV *	1295	static SV *
880	decode_hv (dec_t *dec)	1296	decode_hv (dec_t *dec)
881	{	1297	{
		1298	SV *sv;
882	HV *hv = newHV ();	1299	HV *hv = newHV ();
883		1300
884	DEC_INC_DEPTH;	1301	DEC_INC_DEPTH;
885	decode_ws (dec);	1302	decode_ws (dec);
886		1303
887	if (*dec->cur == '}')	1304	if (*dec->cur == '}')
888	++dec->cur;	1305	++dec->cur;
889	else	1306	else
890	for (;;)	1307	for (;;)
891	{	1308	{
		1309	EXPECT_CH ('"');
		1310
		1311	// heuristic: assume that
		1312	// a) decode_str + hv_store_ent are abysmally slow.
		1313	// b) most hash keys are short, simple ascii text.
		1314	// => try to "fast-match" such strings to avoid
		1315	// the overhead of decode_str + hv_store_ent.
		1316	{
892	SV *key, *value;	1317	SV *value;
		1318	char *p = dec->cur;
		1319	char *e = p + 24; // only try up to 24 bytes
893		1320
894	decode_ws (dec); EXPECT_CH ('"');	1321	for (;;)
895
896	key = decode_str (dec);
897	if (!key)
898	goto fail;
899
900	decode_ws (dec); EXPECT_CH (':');
901
902	value = decode_sv (dec);
903	if (!value)
904	{	1322	{
		1323	// the >= 0x80 is false on most architectures
		1324	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1325	{
		1326	// slow path, back up and use decode_str
		1327	SV *key = decode_str (dec);
		1328	if (!key)
		1329	goto fail;
		1330
		1331	decode_ws (dec); EXPECT_CH (':');
		1332
		1333	decode_ws (dec);
		1334	value = decode_sv (dec);
		1335	if (!value)
		1336	{
		1337	SvREFCNT_dec (key);
		1338	goto fail;
		1339	}
		1340
		1341	hv_store_ent (hv, key, value, 0);
905	SvREFCNT_dec (key);	1342	SvREFCNT_dec (key);
		1343
		1344	break;
		1345	}
		1346	else if (*p == '"')
		1347	{
		1348	// fast path, got a simple key
		1349	char *key = dec->cur;
		1350	int len = p - key;
		1351	dec->cur = p + 1;
		1352
		1353	decode_ws (dec); EXPECT_CH (':');
		1354
		1355	decode_ws (dec);
		1356	value = decode_sv (dec);
		1357	if (!value)
906	goto fail;	1358	goto fail;
		1359
		1360	hv_store (hv, key, len, value, 0);
		1361
		1362	break;
		1363	}
		1364
		1365	++p;
907	}	1366	}
908		1367	}
909	hv_store_ent (hv, key, value, 0);
910	SvREFCNT_dec (key);
911		1368
912	decode_ws (dec);	1369	decode_ws (dec);
913		1370
914	if (*dec->cur == '}')	1371	if (*dec->cur == '}')
915	{	1372	{
…		…
919		1376
920	if (*dec->cur != ',')	1377	if (*dec->cur != ',')
921	ERR (", or } expected while parsing object/hash");	1378	ERR (", or } expected while parsing object/hash");
922		1379
923	++dec->cur;	1380	++dec->cur;
		1381
		1382	decode_ws (dec);
		1383
		1384	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1385	{
		1386	++dec->cur;
		1387	break;
		1388	}
924	}	1389	}
925		1390
926	DEC_DEC_DEPTH;	1391	DEC_DEC_DEPTH;
927	return newRV_noinc ((SV *)hv);	1392	sv = newRV_noinc ((SV *)hv);
		1393
		1394	// check filter callbacks
		1395	if (dec->json.flags & F_HOOK)
		1396	{
		1397	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1398	{
		1399	HE *cb, *he;
		1400
		1401	hv_iterinit (hv);
		1402	he = hv_iternext (hv);
		1403	hv_iterinit (hv);
		1404
		1405	// the next line creates a mortal sv each time its called.
		1406	// might want to optimise this for common cases.
		1407	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1408
		1409	if (cb)
		1410	{
		1411	dSP;
		1412	int count;
		1413
		1414	ENTER; SAVETMPS; PUSHMARK (SP);
		1415	XPUSHs (HeVAL (he));
		1416	sv_2mortal (sv);
		1417
		1418	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1419
		1420	if (count == 1)
		1421	{
		1422	sv = newSVsv (POPs);
		1423	FREETMPS; LEAVE;
		1424	return sv;
		1425	}
		1426
		1427	SvREFCNT_inc (sv);
		1428	FREETMPS; LEAVE;
		1429	}
		1430	}
		1431
		1432	if (dec->json.cb_object)
		1433	{
		1434	dSP;
		1435	int count;
		1436
		1437	ENTER; SAVETMPS; PUSHMARK (SP);
		1438	XPUSHs (sv_2mortal (sv));
		1439
		1440	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1441
		1442	if (count == 1)
		1443	{
		1444	sv = newSVsv (POPs);
		1445	FREETMPS; LEAVE;
		1446	return sv;
		1447	}
		1448
		1449	SvREFCNT_inc (sv);
		1450	FREETMPS; LEAVE;
		1451	}
		1452	}
		1453
		1454	return sv;
928		1455
929	fail:	1456	fail:
930	SvREFCNT_dec (hv);	1457	SvREFCNT_dec (hv);
931	DEC_DEC_DEPTH;	1458	DEC_DEC_DEPTH;
932	return 0;	1459	return 0;
933	}	1460	}
934		1461
935	static SV *	1462	static SV *
936	decode_sv (dec_t *dec)	1463	decode_sv (dec_t *dec)
937	{	1464	{
938	decode_ws (dec);	1465	// the beauty of JSON: you need exactly one character lookahead
		1466	// to parse everything.
939	switch (*dec->cur)	1467	switch (*dec->cur)
940	{	1468	{
941	case '"': ++dec->cur; return decode_str (dec);	1469	case '"': ++dec->cur; return decode_str (dec);
942	case '[': ++dec->cur; return decode_av (dec);	1470	case '[': ++dec->cur; return decode_av (dec);
943	case '{': ++dec->cur; return decode_hv (dec);	1471	case '{': ++dec->cur; return decode_hv (dec);
944		1472
945	case '-':	1473	case '-':
946	case '0': case '1': case '2': case '3': case '4':	1474	case '0': case '1': case '2': case '3': case '4':
947	case '5': case '6': case '7': case '8': case '9':	1475	case '5': case '6': case '7': case '8': case '9':
948	return decode_num (dec);	1476	return decode_num (dec);
949		1477
950	case 't':	1478	case 't':
951	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1479	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
952	{	1480	{
953	dec->cur += 4;	1481	dec->cur += 4;
		1482	#if JSON_SLOW
		1483	json_true = get_bool ("JSON::XS::true");
		1484	#endif
954	return newSViv (1);	1485	return newSVsv (json_true);
955	}	1486	}
956	else	1487	else
957	ERR ("'true' expected");	1488	ERR ("'true' expected");
958		1489
959	break;	1490	break;
960		1491
961	case 'f':	1492	case 'f':
962	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1493	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
963	{	1494	{
964	dec->cur += 5;	1495	dec->cur += 5;
		1496	#if JSON_SLOW
		1497	json_false = get_bool ("JSON::XS::false");
		1498	#endif
965	return newSViv (0);	1499	return newSVsv (json_false);
966	}	1500	}
967	else	1501	else
968	ERR ("'false' expected");	1502	ERR ("'false' expected");
969		1503
970	break;	1504	break;
…		…
988	fail:	1522	fail:
989	return 0;	1523	return 0;
990	}	1524	}
991		1525
992	static SV *	1526	static SV *
993	decode_json (SV *string, U32 flags, UV *offset_return)	1527	decode_json (SV *string, JSON *json, char **offset_return)
994	{	1528	{
995	dec_t dec;	1529	dec_t dec;
996	UV offset;
997	SV *sv;	1530	SV *sv;
998		1531
		1532	/* work around bugs in 5.10 where manipulating magic values
		1533	* makes perl ignore the magic in subsequent accesses.
		1534	* also make a copy of non-PV values, to get them into a clean
		1535	* state (SvPV should do that, but it's buggy, see below).
		1536	*/
999	SvGETMAGIC (string);	1537	/*SvGETMAGIC (string);*/
		1538	if (SvMAGICAL (string) || !SvPOK (string))
		1539	string = sv_2mortal (newSVsv (string));
		1540
1000	SvUPGRADE (string, SVt_PV);	1541	SvUPGRADE (string, SVt_PV);
1001		1542
1002	if (flags & F_UTF8)	1543	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1544	* assertion with -DDEBUGGING, although SvCUR is documented to
		1545	* return the xpv_cur field which certainly exists after upgrading.
		1546	* according to nicholas clark, calling SvPOK fixes this.
		1547	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1548	* and hope for the best.
		1549	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1550	* assertion business is seriously broken, try yet another workaround
		1551	* for the broken -DDEBUGGING.
		1552	*/
		1553	{
		1554	#ifdef DEBUGGING
		1555	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1556	#else
		1557	STRLEN offset = SvCUR (string);
		1558	#endif
		1559
		1560	if (offset > json->max_size && json->max_size)
		1561	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1562	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1563	}
		1564
		1565	if (DECODE_WANTS_OCTETS (json))
1003	sv_utf8_downgrade (string, 0);	1566	sv_utf8_downgrade (string, 0);
1004	else	1567	else
1005	sv_utf8_upgrade (string);	1568	sv_utf8_upgrade (string);
1006		1569
1007	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1570	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
1008		1571
1009	dec.flags = flags;	1572	dec.json = *json;
1010	dec.cur = SvPVX (string);	1573	dec.cur = SvPVX (string);
1011	dec.end = SvEND (string);	1574	dec.end = SvEND (string);
1012	dec.err = 0;	1575	dec.err = 0;
1013	dec.depth = 0;	1576	dec.depth = 0;
1014	dec.maxdepth = DEC_DEPTH (dec.flags);	1577
		1578	if (dec.json.cb_object || dec.json.cb_sk_object)
		1579	dec.json.flags |= F_HOOK;
1015		1580
1016	*dec.end = 0; // this should basically be a nop, too, but make sure it's there	1581	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1582
		1583	decode_ws (&dec);
1017	sv = decode_sv (&dec);	1584	sv = decode_sv (&dec);
		1585
		1586	if (offset_return)
		1587	*offset_return = dec.cur;
1018		1588
1019	if (!(offset_return || !sv))	1589	if (!(offset_return || !sv))
1020	{	1590	{
1021	// check for trailing garbage	1591	// check for trailing garbage
1022	decode_ws (&dec);	1592	decode_ws (&dec);
…		…
1025	{	1595	{
1026	dec.err = "garbage after JSON object";	1596	dec.err = "garbage after JSON object";
1027	SvREFCNT_dec (sv);	1597	SvREFCNT_dec (sv);
1028	sv = 0;	1598	sv = 0;
1029	}	1599	}
1030	}
1031
1032	if (offset_return || !sv)
1033	{
1034	offset = dec.flags & F_UTF8
1035	? dec.cur - SvPVX (string)
1036	: utf8_distance (dec.cur, SvPVX (string));
1037
1038	if (offset_return)
1039	*offset_return = offset;
1040	}	1600	}
1041		1601
1042	if (!sv)	1602	if (!sv)
1043	{	1603	{
1044	SV *uni = sv_newmortal ();	1604	SV *uni = sv_newmortal ();
…		…
1050	SAVEVPTR (PL_curcop);	1610	SAVEVPTR (PL_curcop);
1051	PL_curcop = &cop;	1611	PL_curcop = &cop;
1052	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1612	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1053	LEAVE;	1613	LEAVE;
1054		1614
1055	croak ("%s, at character offset %d [\"%s\"]",	1615	croak ("%s, at character offset %d (before \"%s\")",
1056	dec.err,	1616	dec.err,
1057	(int)offset,	1617	(int)ptr_to_index (string, dec.cur),
1058	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1618	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
1059	}	1619	}
1060		1620
1061	sv = sv_2mortal (sv);	1621	sv = sv_2mortal (sv);
1062		1622
1063	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1623	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
1064	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1624	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1065		1625
1066	return sv;	1626	return sv;
		1627	}
		1628
		1629	/////////////////////////////////////////////////////////////////////////////
		1630	// incremental parser
		1631
		1632	static void
		1633	incr_parse (JSON *self)
		1634	{
		1635	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1636
		1637	// the state machine here is a bit convoluted and could be simplified a lot
		1638	// but this would make it slower, so...
		1639
		1640	for (;;)
		1641	{
		1642	//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
		1643	switch (self->incr_mode)
		1644	{
		1645	// only used for initial whitespace skipping
		1646	case INCR_M_WS:
		1647	for (;;)
		1648	{
		1649	if (*p > 0x20)
		1650	{
		1651	if (*p == '#')
		1652	{
		1653	self->incr_mode = INCR_M_C0;
		1654	goto incr_m_c;
		1655	}
		1656	else
		1657	{
		1658	self->incr_mode = INCR_M_JSON;
		1659	goto incr_m_json;
		1660	}
		1661	}
		1662	else if (!*p)
		1663	goto interrupt;
		1664
		1665	++p;
		1666	}
		1667
		1668	// skip a single char inside a string (for \\-processing)
		1669	case INCR_M_BS:
		1670	if (!*p)
		1671	goto interrupt;
		1672
		1673	++p;
		1674	self->incr_mode = INCR_M_STR;
		1675	goto incr_m_str;
		1676
		1677	// inside #-style comments
		1678	case INCR_M_C0:
		1679	case INCR_M_C1:
		1680	incr_m_c:
		1681	for (;;)
		1682	{
		1683	if (*p == '\n')
		1684	{
		1685	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1686	break;
		1687	}
		1688	else if (!*p)
		1689	goto interrupt;
		1690
		1691	++p;
		1692	}
		1693
		1694	break;
		1695
		1696	// inside a string
		1697	case INCR_M_STR:
		1698	incr_m_str:
		1699	for (;;)
		1700	{
		1701	if (*p == '"')
		1702	{
		1703	++p;
		1704	self->incr_mode = INCR_M_JSON;
		1705
		1706	if (!self->incr_nest)
		1707	goto interrupt;
		1708
		1709	goto incr_m_json;
		1710	}
		1711	else if (*p == '\\')
		1712	{
		1713	++p; // "virtually" consumes character after \
		1714
		1715	if (!*p) // if at end of string we have to switch modes
		1716	{
		1717	self->incr_mode = INCR_M_BS;
		1718	goto interrupt;
		1719	}
		1720	}
		1721	else if (!*p)
		1722	goto interrupt;
		1723
		1724	++p;
		1725	}
		1726
		1727	// after initial ws, outside string
		1728	case INCR_M_JSON:
		1729	incr_m_json:
		1730	for (;;)
		1731	{
		1732	switch (*p++)
		1733	{
		1734	case 0:
		1735	--p;
		1736	goto interrupt;
		1737
		1738	case 0x09:
		1739	case 0x0a:
		1740	case 0x0d:
		1741	case 0x20:
		1742	if (!self->incr_nest)
		1743	{
		1744	--p; // do not eat the whitespace, let the next round do it
		1745	goto interrupt;
		1746	}
		1747	break;
		1748
		1749	case '"':
		1750	self->incr_mode = INCR_M_STR;
		1751	goto incr_m_str;
		1752
		1753	case '[':
		1754	case '{':
		1755	if (++self->incr_nest > self->max_depth)
		1756	croak (ERR_NESTING_EXCEEDED);
		1757	break;
		1758
		1759	case ']':
		1760	case '}':
		1761	if (--self->incr_nest <= 0)
		1762	goto interrupt;
		1763	break;
		1764
		1765	case '#':
		1766	self->incr_mode = INCR_M_C1;
		1767	goto incr_m_c;
		1768	}
		1769	}
		1770	}
		1771
		1772	modechange:
		1773	;
		1774	}
		1775
		1776	interrupt:
		1777	self->incr_pos = p - SvPVX (self->incr_text);
		1778	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1779	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
1067	}	1780	}
1068		1781
1069	/////////////////////////////////////////////////////////////////////////////	1782	/////////////////////////////////////////////////////////////////////////////
1070	// XS interface functions	1783	// XS interface functions
1071		1784
1072	MODULE = JSON::XS PACKAGE = JSON::XS	1785	MODULE = JSON::XS PACKAGE = JSON::XS
1073		1786
1074	BOOT:	1787	BOOT:
1075	{	1788	{
1076	int i;	1789	int i;
1077
1078	memset (decode_hexdigit, 0xff, 256);
1079		1790
1080	for (i = 0; i < 256; ++i)	1791	for (i = 0; i < 256; ++i)
1081	decode_hexdigit [i] =	1792	decode_hexdigit [i] =
1082	i >= '0' && i <= '9' ? i - '0'	1793	i >= '0' && i <= '9' ? i - '0'
1083	: i >= 'a' && i <= 'f' ? i - 'a' + 10	1794	: i >= 'a' && i <= 'f' ? i - 'a' + 10
1084	: i >= 'A' && i <= 'F' ? i - 'A' + 10	1795	: i >= 'A' && i <= 'F' ? i - 'A' + 10
1085	: -1;	1796	: -1;
1086		1797
1087	json_stash = gv_stashpv ("JSON::XS", 1);	1798	json_stash = gv_stashpv ("JSON::XS" , 1);
		1799	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1800
		1801	json_true = get_bool ("JSON::XS::true");
		1802	json_false = get_bool ("JSON::XS::false");
		1803
		1804	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
1088	}	1805	}
1089		1806
1090	PROTOTYPES: DISABLE	1807	PROTOTYPES: DISABLE
1091		1808
1092	SV *new (char *dummy)	1809	void CLONE (...)
1093	CODE:	1810	CODE:
1094	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1811	json_stash = 0;
		1812	json_boolean_stash = 0;
		1813
		1814	void new (char *klass)
		1815	PPCODE:
		1816	{
		1817	SV *pv = NEWSV (0, sizeof (JSON));
		1818	SvPOK_only (pv);
		1819	json_init ((JSON *)SvPVX (pv));
		1820	XPUSHs (sv_2mortal (sv_bless (
		1821	newRV_noinc (pv),
		1822	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1823	)));
		1824	}
		1825
		1826	void ascii (JSON *self, int enable = 1)
		1827	ALIAS:
		1828	ascii = F_ASCII
		1829	latin1 = F_LATIN1
		1830	utf8 = F_UTF8
		1831	indent = F_INDENT
		1832	canonical = F_CANONICAL
		1833	space_before = F_SPACE_BEFORE
		1834	space_after = F_SPACE_AFTER
		1835	pretty = F_PRETTY
		1836	allow_nonref = F_ALLOW_NONREF
		1837	shrink = F_SHRINK
		1838	allow_blessed = F_ALLOW_BLESSED
		1839	convert_blessed = F_CONV_BLESSED
		1840	relaxed = F_RELAXED
		1841	allow_unknown = F_ALLOW_UNKNOWN
		1842	PPCODE:
		1843	{
		1844	if (enable)
		1845	self->flags |= ix;
		1846	else
		1847	self->flags &= ~ix;
		1848
		1849	XPUSHs (ST (0));
		1850	}
		1851
		1852	void get_ascii (JSON *self)
		1853	ALIAS:
		1854	get_ascii = F_ASCII
		1855	get_latin1 = F_LATIN1
		1856	get_utf8 = F_UTF8
		1857	get_indent = F_INDENT
		1858	get_canonical = F_CANONICAL
		1859	get_space_before = F_SPACE_BEFORE
		1860	get_space_after = F_SPACE_AFTER
		1861	get_allow_nonref = F_ALLOW_NONREF
		1862	get_shrink = F_SHRINK
		1863	get_allow_blessed = F_ALLOW_BLESSED
		1864	get_convert_blessed = F_CONV_BLESSED
		1865	get_relaxed = F_RELAXED
		1866	get_allow_unknown = F_ALLOW_UNKNOWN
		1867	PPCODE:
		1868	XPUSHs (boolSV (self->flags & ix));
		1869
		1870	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		1871	PPCODE:
		1872	self->max_depth = max_depth;
		1873	XPUSHs (ST (0));
		1874
		1875	U32 get_max_depth (JSON *self)
		1876	CODE:
		1877	RETVAL = self->max_depth;
1095	OUTPUT:	1878	OUTPUT:
1096	RETVAL	1879	RETVAL
1097		1880
1098	SV *ascii (SV *self, int enable = 1)	1881	void max_size (JSON *self, U32 max_size = 0)
1099	ALIAS:	1882	PPCODE:
1100	ascii = F_ASCII	1883	self->max_size = max_size;
1101	latin1 = F_LATIN1	1884	XPUSHs (ST (0));
1102	utf8 = F_UTF8	1885
1103	indent = F_INDENT	1886	int get_max_size (JSON *self)
1104	canonical = F_CANONICAL
1105	space_before = F_SPACE_BEFORE
1106	space_after = F_SPACE_AFTER
1107	pretty = F_PRETTY
1108	allow_nonref = F_ALLOW_NONREF
1109	shrink = F_SHRINK
1110	CODE:	1887	CODE:
1111	{	1888	RETVAL = self->max_size;
1112	UV *uv = SvJSON (self);
1113	if (enable)
1114	*uv |= ix;
1115	else
1116	*uv &= ~ix;
1117
1118	RETVAL = newSVsv (self);
1119	}
1120	OUTPUT:	1889	OUTPUT:
1121	RETVAL	1890	RETVAL
1122		1891
1123	SV *max_depth (SV *self, UV max_depth = 0x80000000UL)	1892	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1893	PPCODE:
		1894	{
		1895	SvREFCNT_dec (self->cb_object);
		1896	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1897
		1898	XPUSHs (ST (0));
		1899	}
		1900
		1901	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1902	PPCODE:
		1903	{
		1904	if (!self->cb_sk_object)
		1905	self->cb_sk_object = newHV ();
		1906
		1907	if (SvOK (cb))
		1908	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1909	else
		1910	{
		1911	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1912
		1913	if (!HvKEYS (self->cb_sk_object))
		1914	{
		1915	SvREFCNT_dec (self->cb_sk_object);
		1916	self->cb_sk_object = 0;
		1917	}
		1918	}
		1919
		1920	XPUSHs (ST (0));
		1921	}
		1922
		1923	void encode (JSON *self, SV *scalar)
		1924	PPCODE:
		1925	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		1926	XPUSHs (scalar);
		1927
		1928	void decode (JSON *self, SV *jsonstr)
		1929	PPCODE:
		1930	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		1931	XPUSHs (jsonstr);
		1932
		1933	void decode_prefix (JSON *self, SV *jsonstr)
		1934	PPCODE:
		1935	{
		1936	SV *sv;
		1937	char *offset;
		1938	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		1939	EXTEND (SP, 2);
		1940	PUSHs (sv);
		1941	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		1942	}
		1943
		1944	void incr_parse (JSON *self, SV *jsonstr = 0)
		1945	PPCODE:
		1946	{
		1947	if (!self->incr_text)
		1948	self->incr_text = newSVpvn ("", 0);
		1949
		1950	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		1951	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		1952	if (DECODE_WANTS_OCTETS (self))
		1953	{
		1954	if (self->incr_pos)
		1955	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		1956	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		1957
		1958	sv_utf8_downgrade (self->incr_text, 0);
		1959	}
		1960	else
		1961	{
		1962	sv_utf8_upgrade (self->incr_text);
		1963
		1964	if (self->incr_pos)
		1965	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		1966	- (U8 *)SvPVX (self->incr_text);
		1967	}
		1968
		1969	// append data, if any
		1970	if (jsonstr)
		1971	{
		1972	/* make sure both strings have same encoding */
		1973	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		1974	if (SvUTF8 (jsonstr))
		1975	sv_utf8_downgrade (jsonstr, 0);
		1976	else
		1977	sv_utf8_upgrade (jsonstr);
		1978
		1979	/* and then just blindly append */
		1980	{
		1981	STRLEN len;
		1982	const char *str = SvPV (jsonstr, len);
		1983	STRLEN cur = SvCUR (self->incr_text);
		1984
		1985	if (SvLEN (self->incr_text) <= cur + len)
		1986	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1987
		1988	Move (str, SvEND (self->incr_text), len, char);
		1989	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		1990	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		1991	}
		1992	}
		1993
		1994	if (GIMME_V != G_VOID)
		1995	do
		1996	{
		1997	SV *sv;
		1998	char *offset;
		1999
		2000	if (!INCR_DONE (self))
		2001	{
		2002	incr_parse (self);
		2003
		2004	if (self->incr_pos > self->max_size && self->max_size)
		2005	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2006	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2007
		2008	if (!INCR_DONE (self))
		2009	{
		2010	// as an optimisation, do not accumulate white space in the incr buffer
		2011	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2012	{
		2013	self->incr_pos = 0;
		2014	SvCUR_set (self->incr_text, 0);
		2015	}
		2016
		2017	break;
		2018	}
		2019	}
		2020
		2021	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2022	XPUSHs (sv);
		2023
		2024	self->incr_pos -= offset - SvPVX (self->incr_text);
		2025	self->incr_nest = 0;
		2026	self->incr_mode = 0;
		2027
		2028	sv_chop (self->incr_text, offset);
		2029	}
		2030	while (GIMME_V == G_ARRAY);
		2031	}
		2032
		2033	SV *incr_text (JSON *self)
		2034	ATTRS: lvalue
1124	CODE:	2035	CODE:
1125	{	2036	{
1126	UV *uv = SvJSON (self);	2037	if (self->incr_pos)
1127	UV log2 = 0;	2038	croak ("incr_text can not be called when the incremental parser already started parsing");
1128		2039
1129	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;	2040	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
1130
1131	while ((1UL << log2) < max_depth)
1132	++log2;
1133
1134	*uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1135
1136	RETVAL = newSVsv (self);
1137	}	2041	}
1138	OUTPUT:	2042	OUTPUT:
1139	RETVAL	2043	RETVAL
1140		2044
		2045	void incr_skip (JSON *self)
		2046	CODE:
		2047	{
		2048	if (self->incr_pos)
		2049	{
		2050	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2051	self->incr_pos = 0;
		2052	self->incr_nest = 0;
		2053	self->incr_mode = 0;
		2054	}
		2055	}
		2056
		2057	void incr_reset (JSON *self)
		2058	CODE:
		2059	{
		2060	SvREFCNT_dec (self->incr_text);
		2061	self->incr_text = 0;
		2062	self->incr_pos = 0;
		2063	self->incr_nest = 0;
		2064	self->incr_mode = 0;
		2065	}
		2066
		2067	void DESTROY (JSON *self)
		2068	CODE:
		2069	SvREFCNT_dec (self->cb_sk_object);
		2070	SvREFCNT_dec (self->cb_object);
		2071	SvREFCNT_dec (self->incr_text);
		2072
		2073	PROTOTYPES: ENABLE
		2074
1141	void encode (SV *self, SV *scalar)	2075	void encode_json (SV *scalar)
		2076	ALIAS:
		2077	to_json_ = 0
		2078	encode_json = F_UTF8
1142	PPCODE:	2079	PPCODE:
1143	XPUSHs (encode_json (scalar, *SvJSON (self)));	2080	{
		2081	JSON json;
		2082	json_init (&json);
		2083	json.flags |= ix;
		2084	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2085	XPUSHs (scalar);
		2086	}
1144		2087
1145	void decode (SV *self, SV *jsonstr)	2088	void decode_json (SV *jsonstr)
		2089	ALIAS:
		2090	from_json_ = 0
		2091	decode_json = F_UTF8
1146	PPCODE:	2092	PPCODE:
1147	XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1148
1149	void decode_prefix (SV *self, SV *jsonstr)
1150	PPCODE:
1151	{	2093	{
1152	UV offset;	2094	JSON json;
1153	EXTEND (SP, 2);	2095	json_init (&json);
1154	PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));	2096	json.flags |= ix;
1155	PUSHs (sv_2mortal (newSVuv (offset)));	2097	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2098	XPUSHs (jsonstr);
1156	}	2099	}
1157		2100
1158	PROTOTYPES: ENABLE
1159
1160	void to_json (SV *scalar)
1161	ALIAS:
1162	objToJson = 0
1163	PPCODE:
1164	XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
1165
1166	void from_json (SV *jsonstr)
1167	ALIAS:
1168	jsonToObj = 0
1169	PPCODE:
1170	XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
1171

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