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Comparing JSON-XS/XS.xs (file contents):
Revision 1.8 by root, Fri Mar 23 16:13:59 2007 UTC vs.
Revision 1.119 by root, Mon Oct 28 23:19:54 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>
		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_ALLOW_TAGS 0x00004000UL
		39	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
18		40
19	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	41	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20	#define F_DEFAULT 0
21		42
22	#define INIT_SIZE 32 // initial scalar size to be allocated	43	#define INIT_SIZE 32 // initial scalar size to be allocated
		44	#define INDENT_STEP 3 // spaces per indentation level
		45
		46	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
		47
		48	#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
23		49
24	#define SB do {	50	#define SB do {
25	#define SE } while (0)	51	#define SE } while (0)
26		52
27	static HV *json_stash;	53	#if __GNUC__ >= 3
		54	# define expect(expr,value) __builtin_expect ((expr), (value))
		55	# define INLINE static inline
		56	#else
		57	# define expect(expr,value) (expr)
		58	# define INLINE static
		59	#endif
		60
		61	#define expect_false(expr) expect ((expr) != 0, 0)
		62	#define expect_true(expr) expect ((expr) != 0, 1)
		63
		64	#define IN_RANGE_INC(type,val,beg,end) \
		65	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		66	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		67
		68	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		69
		70	#ifdef USE_ITHREADS
		71	# define JSON_SLOW 1
		72	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		73	#else
		74	# define JSON_SLOW 0
		75	# define JSON_STASH json_stash
		76	#endif
		77
		78	// the amount of HEs to allocate on the stack, when sorting keys
		79	#define STACK_HES 64
		80
		81	static HV *json_stash, *types_boolean_stash; // JSON::XS::
		82	static SV *types_true, *types_false, *sv_json;
		83
		84	enum {
		85	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		86	INCR_M_STR, // inside string
		87	INCR_M_BS, // inside backslash
		88	INCR_M_C0, // inside comment in initial whitespace sequence
		89	INCR_M_C1, // inside comment in other places
		90	INCR_M_JSON // outside anything, count nesting
		91	};
		92
		93	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		94
		95	typedef struct {
		96	U32 flags;
		97	U32 max_depth;
		98	STRLEN max_size;
		99
		100	SV *cb_object;
		101	HV *cb_sk_object;
		102
		103	// for the incremental parser
		104	SV *incr_text; // the source text so far
		105	STRLEN incr_pos; // the current offset into the text
		106	int incr_nest; // {[]}-nesting level
		107	unsigned char incr_mode;
		108	} JSON;
		109
		110	INLINE void
		111	json_init (JSON *json)
		112	{
		113	Zero (json, 1, JSON);
		114	json->max_depth = 512;
		115	}
		116
		117	/////////////////////////////////////////////////////////////////////////////
		118	// utility functions
		119
		120	INLINE SV *
		121	get_bool (const char *name)
		122	{
		123	SV *sv = get_sv (name, 1);
		124
		125	SvREADONLY_on (sv);
		126	SvREADONLY_on (SvRV (sv));
		127
		128	return sv;
		129	}
		130
		131	INLINE void
		132	shrink (SV *sv)
		133	{
		134	sv_utf8_downgrade (sv, 1);
		135
		136	if (SvLEN (sv) > SvCUR (sv) + 1)
		137	{
		138	#ifdef SvPV_shrink_to_cur
		139	SvPV_shrink_to_cur (sv);
		140	#elif defined (SvPV_renew)
		141	SvPV_renew (sv, SvCUR (sv) + 1);
		142	#endif
		143	}
		144	}
		145
		146	// decode an utf-8 character and return it, or (UV)-1 in
		147	// case of an error.
		148	// we special-case "safe" characters from U+80 .. U+7FF,
		149	// but use the very good perl function to parse anything else.
		150	// note that we never call this function for a ascii codepoints
		151	INLINE UV
		152	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		153	{
		154	if (expect_true (len >= 2
		155	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		156	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		157	{
		158	*clen = 2;
		159	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		160	}
		161	else
		162	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		163	}
		164
		165	// likewise for encoding, also never called for ascii codepoints
		166	// this function takes advantage of this fact, although current gccs
		167	// seem to optimise the check for >= 0x80 away anyways
		168	INLINE unsigned char *
		169	encode_utf8 (unsigned char *s, UV ch)
		170	{
		171	if (expect_false (ch < 0x000080))
		172	*s++ = ch;
		173	else if (expect_true (ch < 0x000800))
		174	*s++ = 0xc0 | ( ch >> 6),
		175	*s++ = 0x80 | ( ch & 0x3f);
		176	else if ( ch < 0x010000)
		177	*s++ = 0xe0 | ( ch >> 12),
		178	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		179	*s++ = 0x80 | ( ch & 0x3f);
		180	else if ( ch < 0x110000)
		181	*s++ = 0xf0 | ( ch >> 18),
		182	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		183	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		184	*s++ = 0x80 | ( ch & 0x3f);
		185
		186	return s;
		187	}
		188
		189	// convert offset pointer to character index, sv must be string
		190	static STRLEN
		191	ptr_to_index (SV *sv, char *offset)
		192	{
		193	return SvUTF8 (sv)
		194	? utf8_distance (offset, SvPVX (sv))
		195	: offset - SvPVX (sv);
		196	}
		197
		198	/////////////////////////////////////////////////////////////////////////////
		199	// fp hell
		200
		201	// scan a group of digits, and a trailing exponent
		202	static void
		203	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		204	{
		205	UV uaccum = 0;
		206	int eaccum = 0;
		207
		208	// if we recurse too deep, skip all remaining digits
		209	// to avoid a stack overflow attack
		210	if (expect_false (--maxdepth <= 0))
		211	while (((U8)*s - '0') < 10)
		212	++s;
		213
		214	for (;;)
		215	{
		216	U8 dig = (U8)*s - '0';
		217
		218	if (expect_false (dig >= 10))
		219	{
		220	if (dig == (U8)((U8)'.' - (U8)'0'))
		221	{
		222	++s;
		223	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		224	}
		225	else if ((dig | ' ') == 'e' - '0')
		226	{
		227	int exp2 = 0;
		228	int neg = 0;
		229
		230	++s;
		231
		232	if (*s == '-')
		233	{
		234	++s;
		235	neg = 1;
		236	}
		237	else if (*s == '+')
		238	++s;
		239
		240	while ((dig = (U8)*s - '0') < 10)
		241	exp2 = exp2 * 10 + *s++ - '0';
		242
		243	*expo += neg ? -exp2 : exp2;
		244	}
		245
		246	break;
		247	}
		248
		249	++s;
		250
		251	uaccum = uaccum * 10 + dig;
		252	++eaccum;
		253
		254	// if we have too many digits, then recurse for more
		255	// we actually do this for rather few digits
		256	if (uaccum >= (UV_MAX - 9) / 10)
		257	{
		258	if (postdp) *expo -= eaccum;
		259	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		260	if (postdp) *expo += eaccum;
		261
		262	break;
		263	}
		264	}
		265
		266	// this relies greatly on the quality of the pow ()
		267	// implementation of the platform, but a good
		268	// implementation is hard to beat.
		269	// (IEEE 754 conformant ones are required to be exact)
		270	if (postdp) *expo -= eaccum;
		271	*accum += uaccum * Perl_pow (10., *expo);
		272	*expo += eaccum;
		273	}
		274
		275	static NV
		276	json_atof (const char *s)
		277	{
		278	NV accum = 0.;
		279	int expo = 0;
		280	int neg = 0;
		281
		282	if (*s == '-')
		283	{
		284	++s;
		285	neg = 1;
		286	}
		287
		288	// a recursion depth of ten gives us >>500 bits
		289	json_atof_scan1 (s, &accum, &expo, 0, 10);
		290
		291	return neg ? -accum : accum;
		292	}
		293	/////////////////////////////////////////////////////////////////////////////
		294	// encoder
28		295
29	// structure used for encoding JSON	296	// structure used for encoding JSON
30	typedef struct	297	typedef struct
31	{	298	{
32	char *cur;	299	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	300	char *end; // SvEND (sv)
35	SV *sv;	301	SV *sv; // result scalar
36	UV flags;	302	JSON json;
37	int max_recurse;	303	U32 indent; // indentation level
38	int indent;	304	UV limit; // escape character values >= this value when encoding
39	} enc_t;	305	} enc_t;
40		306
41	// structure used for decoding JSON	307	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)	308	need (enc_t *enc, STRLEN len)
72	{	309	{
73	if (enc->cur + len >= enc->end)	310	if (expect_false (enc->cur + len >= enc->end))
74	{	311	{
75	STRLEN cur = enc->cur - SvPVX (enc->sv);	312	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
76	SvGROW (enc->sv, cur + len + 1);	313	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
77	enc->cur = SvPVX (enc->sv) + cur;	314	enc->cur = SvPVX (enc->sv) + cur;
78	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	315	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79	}	316	}
80	}	317	}
81		318
82	static void	319	INLINE void
83	encode_ch (enc_t *enc, char ch)	320	encode_ch (enc_t *enc, char ch)
84	{	321	{
85	need (enc, 1);	322	need (enc, 1);
86	*enc->cur++ = ch;	323	*enc->cur++ = ch;
87	}	324	}
…		…
95		332
96	while (str < end)	333	while (str < end)
97	{	334	{
98	unsigned char ch = *(unsigned char *)str;	335	unsigned char ch = *(unsigned char *)str;
99		336
100	if (ch >= 0x20 && ch < 0x80) // most common case	337	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101	{	338	{
102	if (ch == '"') // but with slow exceptions	339	if (expect_false (ch == '"')) // but with slow exceptions
103	{	340	{
104	need (enc, len += 1);	341	need (enc, len += 1);
105	*enc->cur++ = '\\';	342	*enc->cur++ = '\\';
106	*enc->cur++ = '"';	343	*enc->cur++ = '"';
107	}	344	}
108	else if (ch == '\\')	345	else if (expect_false (ch == '\\'))
109	{	346	{
110	need (enc, len += 1);	347	need (enc, len += 1);
111	*enc->cur++ = '\\';	348	*enc->cur++ = '\\';
112	*enc->cur++ = '\\';	349	*enc->cur++ = '\\';
113	}	350	}
…		…
131	STRLEN clen;	368	STRLEN clen;
132	UV uch;	369	UV uch;
133		370
134	if (is_utf8)	371	if (is_utf8)
135	{	372	{
136	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	373	uch = decode_utf8 (str, end - str, &clen);
137	if (clen == (STRLEN)-1)	374	if (clen == (STRLEN)-1)
138	croak ("malformed UTF-8 character in string, cannot convert to JSON");	375	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139	}	376	}
140	else	377	else
141	{	378	{
142	uch = ch;	379	uch = ch;
143	clen = 1;	380	clen = 1;
144	}	381	}
145		382
146	if (uch < 0x80 || enc->flags & F_ASCII)	383	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
147	{	384	{
148	if (uch > 0xFFFFUL)	385	if (uch >= 0x10000UL)
149	{	386	{
		387	if (uch >= 0x110000UL)
		388	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		389
150	need (enc, len += 11);	390	need (enc, len += 11);
151	sprintf (enc->cur, "\\u%04x\\u%04x",	391	sprintf (enc->cur, "\\u%04x\\u%04x",
152	(uch - 0x10000) / 0x400 + 0xD800,	392	(int)((uch - 0x10000) / 0x400 + 0xD800),
153	(uch - 0x10000) % 0x400 + 0xDC00);	393	(int)((uch - 0x10000) % 0x400 + 0xDC00));
154	enc->cur += 12;	394	enc->cur += 12;
155	}	395	}
156	else	396	else
157	{	397	{
158	static char hexdigit [16] = "0123456789abcdef";
159	need (enc, len += 5);	398	need (enc, len += 5);
160	*enc->cur++ = '\\';	399	*enc->cur++ = '\\';
161	*enc->cur++ = 'u';	400	*enc->cur++ = 'u';
162	*enc->cur++ = hexdigit [ uch >> 12 ];	401	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
163	*enc->cur++ = hexdigit [(uch >> 8) & 15];	402	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
164	*enc->cur++ = hexdigit [(uch >> 4) & 15];	403	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
165	*enc->cur++ = hexdigit [(uch >> 0) & 15];	404	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
166	}	405	}
167		406
		407	str += clen;
		408	}
		409	else if (enc->json.flags & F_LATIN1)
		410	{
		411	*enc->cur++ = uch;
168	str += clen;	412	str += clen;
169	}	413	}
170	else if (is_utf8)	414	else if (is_utf8)
171	{	415	{
172	need (enc, len += clen);	416	need (enc, len += clen);
…		…
176	}	420	}
177	while (--clen);	421	while (--clen);
178	}	422	}
179	else	423	else
180	{	424	{
181	need (enc, len += 10); // never more than 11 bytes needed	425	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
182	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	426	enc->cur = encode_utf8 (enc->cur, uch);
183	++str;	427	++str;
184	}	428	}
185	}	429	}
186	}	430	}
187	}	431	}
188		432
189	--len;	433	--len;
190	}	434	}
191	}	435	}
192		436
193	#define INDENT SB \	437	INLINE void
		438	encode_indent (enc_t *enc)
		439	{
194	if (enc->flags & F_INDENT) \	440	if (enc->json.flags & F_INDENT)
195	{ \	441	{
196	int i_; \	442	int spaces = enc->indent * INDENT_STEP;
197	need (enc, enc->indent); \	443
198	for (i_ = enc->indent * 3; i_--; )\	444	need (enc, spaces);
		445	memset (enc->cur, ' ', spaces);
		446	enc->cur += spaces;
		447	}
		448	}
		449
		450	INLINE void
		451	encode_space (enc_t *enc)
		452	{
		453	need (enc, 1);
		454	encode_ch (enc, ' ');
		455	}
		456
		457	INLINE void
		458	encode_nl (enc_t *enc)
		459	{
		460	if (enc->json.flags & F_INDENT)
		461	{
		462	need (enc, 1);
199	encode_ch (enc, ' '); \	463	encode_ch (enc, '\n');
200	} \	464	}
201	SE	465	}
202		466
203	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	467	INLINE void
204	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	468	encode_comma (enc_t *enc)
205	#define COMMA SB \	469	{
206	encode_ch (enc, ','); \	470	encode_ch (enc, ',');
		471
207	if (enc->flags & F_INDENT) \	472	if (enc->json.flags & F_INDENT)
208	NL; \	473	encode_nl (enc);
209	else if (enc->flags & F_SPACE_AFTER) \	474	else if (enc->json.flags & F_SPACE_AFTER)
210	SPACE; \	475	encode_space (enc);
211	SE	476	}
212		477
213	static void encode_sv (enc_t *enc, SV *sv);	478	static void encode_sv (enc_t *enc, SV *sv);
214		479
215	static void	480	static void
216	encode_av (enc_t *enc, AV *av)	481	encode_av (enc_t *enc, AV *av)
217	{	482	{
218	int i, len = av_len (av);	483	int i, len = av_len (av);
219		484
		485	if (enc->indent >= enc->json.max_depth)
		486	croak (ERR_NESTING_EXCEEDED);
		487
220	encode_ch (enc, '['); NL;	488	encode_ch (enc, '[');
221	++enc->indent;
222		489
		490	if (len >= 0)
		491	{
		492	encode_nl (enc); ++enc->indent;
		493
223	for (i = 0; i <= len; ++i)	494	for (i = 0; i <= len; ++i)
224	{	495	{
225	INDENT;	496	SV **svp = av_fetch (av, i, 0);
226	encode_sv (enc, *av_fetch (av, i, 0));
227		497
		498	encode_indent (enc);
		499
		500	if (svp)
		501	encode_sv (enc, *svp);
		502	else
		503	encode_str (enc, "null", 4, 0);
		504
228	if (i < len)	505	if (i < len)
229	COMMA;	506	encode_comma (enc);
230	}	507	}
231		508
232	NL;	509	encode_nl (enc); --enc->indent; encode_indent (enc);
		510	}
233		511
234	--enc->indent;
235	INDENT; encode_ch (enc, ']');	512	encode_ch (enc, ']');
236	}	513	}
237		514
238	static void	515	static void
239	encode_he (enc_t *enc, HE *he)	516	encode_hk (enc_t *enc, HE *he)
240	{	517	{
241	encode_ch (enc, '"');	518	encode_ch (enc, '"');
242		519
243	if (HeKLEN (he) == HEf_SVKEY)	520	if (HeKLEN (he) == HEf_SVKEY)
244	{	521	{
245	SV *sv = HeSVKEY (he);	522	SV *sv = HeSVKEY (he);
246	STRLEN len;	523	STRLEN len;
247	char *str;	524	char *str;
248		525
249	SvGETMAGIC (sv);	526	SvGETMAGIC (sv);
250	str = SvPV (sv, len);	527	str = SvPV (sv, len);
251		528
252	encode_str (enc, str, len, SvUTF8 (sv));	529	encode_str (enc, str, len, SvUTF8 (sv));
253	}	530	}
254	else	531	else
255	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	532	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
256		533
257	encode_ch (enc, '"');	534	encode_ch (enc, '"');
258		535
259	if (enc->flags & F_SPACE_BEFORE) SPACE;	536	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
260	encode_ch (enc, ':');	537	encode_ch (enc, ':');
261	if (enc->flags & F_SPACE_AFTER ) SPACE;	538	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
262	encode_sv (enc, HeVAL (he));
263	}	539	}
264		540
265	// compare hash entries, used when all keys are bytestrings	541	// compare hash entries, used when all keys are bytestrings
266	static int	542	static int
267	he_cmp_fast (const void *a_, const void *b_)	543	he_cmp_fast (const void *a_, const void *b_)
…		…
272	HE *b = *(HE **)b_;	548	HE *b = *(HE **)b_;
273		549
274	STRLEN la = HeKLEN (a);	550	STRLEN la = HeKLEN (a);
275	STRLEN lb = HeKLEN (b);	551	STRLEN lb = HeKLEN (b);
276		552
277	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	553	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
278	cmp = la < lb ? -1 : la == lb ? 0 : 1;	554	cmp = lb - la;
279		555
280	return cmp;	556	return cmp;
281	}	557	}
282		558
283	// compare hash entries, used when some keys are sv's or utf-x	559	// compare hash entries, used when some keys are sv's or utf-x
284	static int	560	static int
285	he_cmp_slow (const void *a, const void *b)	561	he_cmp_slow (const void *a, const void *b)
286	{	562	{
287	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	563	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
288	}	564	}
289		565
290	static void	566	static void
291	encode_hv (enc_t *enc, HV *hv)	567	encode_hv (enc_t *enc, HV *hv)
292	{	568	{
293	int count, i;	569	HE *he;
294		570
295	encode_ch (enc, '{'); NL; ++enc->indent;	571	if (enc->indent >= enc->json.max_depth)
		572	croak (ERR_NESTING_EXCEEDED);
296		573
297	if ((count = hv_iterinit (hv)))	574	encode_ch (enc, '{');
298	{	575
299	// for canonical output we have to sort by keys first	576	// for canonical output we have to sort by keys first
300	// actually, this is mostly due to the stupid so-called	577	// actually, this is mostly due to the stupid so-called
301	// security workaround added somewhere in 5.8.x.	578	// security workaround added somewhere in 5.8.x
302	// that randomises hash orderings	579	// that randomises hash orderings
303	if (enc->flags & F_CANONICAL)	580	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		581	{
		582	int count = hv_iterinit (hv);
		583
		584	if (SvMAGICAL (hv))
304	{	585	{
305	HE *he, *hes [count];	586	// need to count by iterating. could improve by dynamically building the vector below
		587	// but I don't care for the speed of this special case.
		588	// note also that we will run into undefined behaviour when the two iterations
		589	// do not result in the same count, something I might care for in some later release.
		590
		591	count = 0;
		592	while (hv_iternext (hv))
		593	++count;
		594
		595	hv_iterinit (hv);
		596	}
		597
		598	if (count)
		599	{
306	int fast = 1;	600	int i, fast = 1;
		601	HE *hes_stack [STACK_HES];
		602	HE **hes = hes_stack;
		603
		604	// allocate larger arrays on the heap
		605	if (count > STACK_HES)
		606	{
		607	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		608	hes = (HE **)SvPVX (sv);
		609	}
307		610
308	i = 0;	611	i = 0;
309	while ((he = hv_iternext (hv)))	612	while ((he = hv_iternext (hv)))
310	{	613	{
311	hes [i++] = he;	614	hes [i++] = he;
…		…
333		636
334	FREETMPS;	637	FREETMPS;
335	LEAVE;	638	LEAVE;
336	}	639	}
337		640
338	for (i = 0; i < count; ++i)	641	encode_nl (enc); ++enc->indent;
339	{
340	INDENT;
341	encode_he (enc, hes [i]);
342		642
343	if (i < count - 1)	643	while (count--)
344	COMMA;
345	}	644	{
		645	encode_indent (enc);
		646	he = hes [count];
		647	encode_hk (enc, he);
		648	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
346		649
		650	if (count)
		651	encode_comma (enc);
347	NL;	652	}
		653
		654	encode_nl (enc); --enc->indent; encode_indent (enc);
348	}	655	}
		656	}
		657	else
		658	{
		659	if (hv_iterinit (hv) || SvMAGICAL (hv))
		660	if ((he = hv_iternext (hv)))
		661	{
		662	encode_nl (enc); ++enc->indent;
		663
		664	for (;;)
		665	{
		666	encode_indent (enc);
		667	encode_hk (enc, he);
		668	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		669
		670	if (!(he = hv_iternext (hv)))
		671	break;
		672
		673	encode_comma (enc);
		674	}
		675
		676	encode_nl (enc); --enc->indent; encode_indent (enc);
		677	}
		678	}
		679
		680	encode_ch (enc, '}');
		681	}
		682
		683	// encode objects, arrays and special \0=false and \1=true values.
		684	static void
		685	encode_rv (enc_t *enc, SV *sv)
		686	{
		687	svtype svt;
		688
		689	SvGETMAGIC (sv);
		690	svt = SvTYPE (sv);
		691
		692	if (expect_false (SvOBJECT (sv)))
		693	{
		694	HV *boolean_stash = !JSON_SLOW || types_boolean_stash
		695	? types_boolean_stash
		696	: gv_stashpv ("Types::Serialiser::Boolean", 1);
		697	HV *stash = SvSTASH (sv);
		698
		699	if (stash == boolean_stash)
		700	{
		701	if (SvIV (sv))
		702	encode_str (enc, "true", 4, 0);
		703	else
		704	encode_str (enc, "false", 5, 0);
		705	}
		706	else if (enc->json.flags & F_CONV_BLESSED)
		707	{
		708	GV *to_json = gv_fetchmethod_autoload (stash, "TO_JSON", 0);
		709
		710	if (to_json)
		711	{
		712	dSP;
		713
		714	ENTER; SAVETMPS; PUSHMARK (SP);
		715	// we re-bless the reference to get overload and other niceties right
		716	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		717
		718	// calling with G_SCALAR ensures that we always get a 1 return value
		719	PUTBACK;
		720	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		721	SPAGAIN;
		722
		723	// catch this surprisingly common error
		724	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		725	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		726
		727	sv = POPs;
		728	PUTBACK;
		729
		730	encode_sv (enc, sv);
		731
		732	FREETMPS; LEAVE;
		733	}
		734	else if (enc->json.flags & F_ALLOW_BLESSED)
		735	encode_str (enc, "null", 4, 0);
		736	else
		737	croak ("encountered object '%s' when conv_object is enabled, but TO_JSON is missing and allow_blessed disabled",
		738	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		739	}
		740	else if (enc->json.flags & F_ALLOW_TAGS)
		741	{
		742	GV *method = gv_fetchmethod_autoload (stash, "FREEZE", 0);
		743
		744	if (method)
		745	{
		746	int count;
		747	dSP;
		748
		749	ENTER; SAVETMPS; PUSHMARK (SP);
		750	EXTEND (SP, 2);
		751	// we re-bless the reference to get overload and other niceties right
		752	PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		753	PUSHs (sv_json);
		754
		755	PUTBACK;
		756	count = call_sv ((SV *)GvCV (method), G_ARRAY);
		757	SPAGAIN;
		758
		759	// catch this surprisingly common error
		760	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		761	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		762
		763	encode_ch (enc, '(');
		764	encode_ch (enc, '"');
		765	encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
		766	encode_ch (enc, '"');
		767	encode_ch (enc, ')');
		768	encode_ch (enc, '[');
		769
		770	while (count)
		771	{
		772	encode_sv (enc, SP[1 - count--]);
		773
		774	if (count)
		775	encode_ch (enc, ',');
		776	}
		777
		778	encode_ch (enc, ']');
		779
		780	PUTBACK;
		781
		782	FREETMPS; LEAVE;
		783	}
		784	else if (enc->json.flags & F_ALLOW_BLESSED)
		785	encode_str (enc, "null", 4, 0);
		786	else
		787	croak ("encountered object '%s' when allow_tags is enabled, but FREEZE is missing and allow_blessed disabled",
		788	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		789	}
		790	else if (enc->json.flags & F_ALLOW_BLESSED)
		791	encode_str (enc, "null", 4, 0);
349	else	792	else
350	{	793	croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled",
351	SV *sv;	794	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
352	HE *he = hv_iternext (hv);	795	}
353		796	else if (svt == SVt_PVHV)
354	for (;;)	797	encode_hv (enc, (HV *)sv);
355	{	798	else if (svt == SVt_PVAV)
356	INDENT;	799	encode_av (enc, (AV *)sv);
357	encode_he (enc, he);	800	else if (svt < SVt_PVAV)
358
359	if (!(he = hv_iternext (hv)))
360	break;
361
362	COMMA;
363	}
364
365	NL;
366	}
367	}	801	{
		802	STRLEN len = 0;
		803	char *pv = svt ? SvPV (sv, len) : 0;
368		804
369	--enc->indent; INDENT; encode_ch (enc, '}');	805	if (len == 1 && *pv == '1')
		806	encode_str (enc, "true", 4, 0);
		807	else if (len == 1 && *pv == '0')
		808	encode_str (enc, "false", 5, 0);
		809	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		810	encode_str (enc, "null", 4, 0);
		811	else
		812	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		813	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		814	}
		815	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		816	encode_str (enc, "null", 4, 0);
		817	else
		818	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		819	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
370	}	820	}
371		821
372	static void	822	static void
373	encode_sv (enc_t *enc, SV *sv)	823	encode_sv (enc_t *enc, SV *sv)
374	{	824	{
…		…
382	encode_str (enc, str, len, SvUTF8 (sv));	832	encode_str (enc, str, len, SvUTF8 (sv));
383	encode_ch (enc, '"');	833	encode_ch (enc, '"');
384	}	834	}
385	else if (SvNOKp (sv))	835	else if (SvNOKp (sv))
386	{	836	{
		837	// trust that perl will do the right thing w.r.t. JSON syntax.
387	need (enc, NV_DIG + 32);	838	need (enc, NV_DIG + 32);
388	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	839	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
389	enc->cur += strlen (enc->cur);	840	enc->cur += strlen (enc->cur);
390	}	841	}
391	else if (SvIOKp (sv))	842	else if (SvIOKp (sv))
392	{	843	{
		844	// we assume we can always read an IV as a UV and vice versa
		845	// we assume two's complement
		846	// we assume no aliasing issues in the union
		847	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		848	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		849	{
		850	// optimise the "small number case"
		851	// code will likely be branchless and use only a single multiplication
		852	// works for numbers up to 59074
		853	I32 i = SvIVX (sv);
		854	U32 u;
		855	char digit, nz = 0;
		856
393	need (enc, 64);	857	need (enc, 6);
		858
		859	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		860	u = i < 0 ? -i : i;
		861
		862	// convert to 4.28 fixed-point representation
		863	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		864
		865	// now output digit by digit, each time masking out the integer part
		866	// and multiplying by 5 while moving the decimal point one to the right,
		867	// resulting in a net multiplication by 10.
		868	// we always write the digit to memory but conditionally increment
		869	// the pointer, to enable the use of conditional move instructions.
		870	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		871	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		872	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		873	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		874	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		875	}
		876	else
		877	{
		878	// large integer, use the (rather slow) snprintf way.
		879	need (enc, IVUV_MAXCHARS);
394	enc->cur +=	880	enc->cur +=
395	SvIsUV(sv)	881	SvIsUV(sv)
396	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	882	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
397	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	883	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		884	}
398	}	885	}
399	else if (SvROK (sv))	886	else if (SvROK (sv))
400	{	887	encode_rv (enc, SvRV (sv));
401	if (!--enc->max_recurse)	888	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
402	croak ("data structure too deep (hit recursion limit)");
403
404	sv = SvRV (sv);
405
406	switch (SvTYPE (sv))
407	{
408	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
409	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
410
411	default:
412	croak ("JSON can only represent references to arrays or hashes");
413	}
414	}
415	else if (!SvOK (sv))
416	encode_str (enc, "null", 4, 0);	889	encode_str (enc, "null", 4, 0);
417	else	890	else
418	croak ("encountered perl type that JSON cannot handle");	891	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
		892	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
419	}	893	}
420		894
421	static SV *	895	static SV *
422	encode_json (SV *scalar, UV flags)	896	encode_json (SV *scalar, JSON *json)
423	{	897	{
424	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
425	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
426
427	enc_t enc;	898	enc_t enc;
428	enc.flags = flags;	899
		900	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		901	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		902
		903	enc.json = *json;
429	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	904	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
430	enc.cur = SvPVX (enc.sv);	905	enc.cur = SvPVX (enc.sv);
431	enc.end = SvEND (enc.sv);	906	enc.end = SvEND (enc.sv);
432	enc.max_recurse = 0;
433	enc.indent = 0;	907	enc.indent = 0;
		908	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		909	: enc.json.flags & F_LATIN1 ? 0x000100UL
		910	: 0x110000UL;
434		911
435	SvPOK_only (enc.sv);	912	SvPOK_only (enc.sv);
436	encode_sv (&enc, scalar);	913	encode_sv (&enc, scalar);
		914	encode_nl (&enc);
437		915
		916	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		917	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		918
438	if (!(flags & (F_ASCII | F_UTF8)))	919	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
439	SvUTF8_on (enc.sv);	920	SvUTF8_on (enc.sv);
440		921
441	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
442
443	if (enc.flags & F_SHRINK)	922	if (enc.json.flags & F_SHRINK)
444	shrink (enc.sv);	923	shrink (enc.sv);
445		924
446	return enc.sv;	925	return enc.sv;
447	}	926	}
448		927
449	/////////////////////////////////////////////////////////////////////////////	928	/////////////////////////////////////////////////////////////////////////////
		929	// decoder
450		930
451	#define WS \	931	// structure used for decoding JSON
		932	typedef struct
		933	{
		934	char *cur; // current parser pointer
		935	char *end; // end of input string
		936	const char *err; // parse error, if != 0
		937	JSON json;
		938	U32 depth; // recursion depth
		939	U32 maxdepth; // recursion depth limit
		940	} dec_t;
		941
		942	INLINE void
		943	decode_comment (dec_t *dec)
		944	{
		945	// only '#'-style comments allowed a.t.m.
		946
		947	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		948	++dec->cur;
		949	}
		950
		951	INLINE void
		952	decode_ws (dec_t *dec)
		953	{
452	for (;;) \	954	for (;;)
453	{ \	955	{
454	char ch = *dec->cur; \	956	char ch = *dec->cur;
		957
455	if (ch > 0x20 \	958	if (ch > 0x20)
		959	{
		960	if (expect_false (ch == '#'))
		961	{
		962	if (dec->json.flags & F_RELAXED)
		963	decode_comment (dec);
		964	else
		965	break;
		966	}
		967	else
		968	break;
		969	}
456	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	970	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
457	break; \	971	break; // parse error, but let higher level handle it, gives better error messages
		972
458	++dec->cur; \	973	++dec->cur;
459	}	974	}
		975	}
460		976
461	#define ERR(reason) SB dec->err = reason; goto fail; SE	977	#define ERR(reason) SB dec->err = reason; goto fail; SE
		978
462	#define EXPECT_CH(ch) SB \	979	#define EXPECT_CH(ch) SB \
463	if (*dec->cur != ch) \	980	if (*dec->cur != ch) \
464	ERR (# ch " expected"); \	981	ERR (# ch " expected"); \
465	++dec->cur; \	982	++dec->cur; \
466	SE	983	SE
467		984
		985	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		986	#define DEC_DEC_DEPTH --dec->depth
		987
468	static SV *decode_sv (dec_t *dec);	988	static SV *decode_sv (dec_t *dec);
469		989
470	static signed char decode_hexdigit[256];	990	static signed char decode_hexdigit[256];
471		991
472	static UV	992	static UV
473	decode_4hex (dec_t *dec)	993	decode_4hex (dec_t *dec)
474	{	994	{
475	signed char d1, d2, d3, d4;	995	signed char d1, d2, d3, d4;
		996	unsigned char *cur = (unsigned char *)dec->cur;
476		997
477	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	998	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
478	if (d1 < 0) ERR ("four hexadecimal digits expected");	999	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
479	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	1000	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
480	if (d2 < 0) ERR ("four hexadecimal digits expected");	1001	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
481	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
482	if (d3 < 0) ERR ("four hexadecimal digits expected");
483	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
484	if (d4 < 0) ERR ("four hexadecimal digits expected");
485		1002
486	dec->cur += 4;	1003	dec->cur += 4;
487		1004
488	return ((UV)d1) << 12	1005	return ((UV)d1) << 12
489	| ((UV)d2) << 8	1006	| ((UV)d2) << 8
…		…
492		1009
493	fail:	1010	fail:
494	return (UV)-1;	1011	return (UV)-1;
495	}	1012	}
496		1013
497	#define APPEND_GROW(n) SB \
498	if (cur + (n) >= end) \
499	{ \
500	STRLEN ofs = cur - SvPVX (sv); \
501	SvGROW (sv, ofs + (n) + 1); \
502	cur = SvPVX (sv) + ofs; \
503	end = SvEND (sv); \
504	} \
505	SE
506
507	#define APPEND_CH(ch) SB \
508	APPEND_GROW (1); \
509	*cur++ = (ch); \
510	SE
511
512	static SV *	1014	static SV *
513	decode_str (dec_t *dec)	1015	decode_str (dec_t *dec)
514	{	1016	{
515	SV *sv = NEWSV (0,2);	1017	SV *sv = 0;
516	int utf8 = 0;	1018	int utf8 = 0;
517	char *cur = SvPVX (sv);	1019	char *dec_cur = dec->cur;
518	char *end = SvEND (sv);
519		1020
520	for (;;)	1021	do
521	{	1022	{
522	unsigned char ch = *(unsigned char *)dec->cur;	1023	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		1024	char *cur = buf;
523		1025
524	if (ch == '"')	1026	do
525	break;
526	else if (ch == '\\')
527	{	1027	{
528	switch (*++dec->cur)	1028	unsigned char ch = *(unsigned char *)dec_cur++;
		1029
		1030	if (expect_false (ch == '"'))
		1031	{
		1032	--dec_cur;
		1033	break;
529	{	1034	}
530	case '\\':	1035	else if (expect_false (ch == '\\'))
531	case '/':	1036	{
532	case '"': APPEND_CH (*dec->cur++); break;	1037	switch (*dec_cur)
533
534	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
535	case 't': APPEND_CH ('\011'); ++dec->cur; break;
536	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
537	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
538	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
539
540	case 'u':
541	{	1038	{
542	UV lo, hi;	1039	case '\\':
543	++dec->cur;	1040	case '/':
		1041	case '"': *cur++ = *dec_cur++; break;
544		1042
545	hi = decode_4hex (dec);	1043	case 'b': ++dec_cur; *cur++ = '\010'; break;
546	if (hi == (UV)-1)	1044	case 't': ++dec_cur; *cur++ = '\011'; break;
547	goto fail;	1045	case 'n': ++dec_cur; *cur++ = '\012'; break;
		1046	case 'f': ++dec_cur; *cur++ = '\014'; break;
		1047	case 'r': ++dec_cur; *cur++ = '\015'; break;
548		1048
549	// possibly a surrogate pair	1049	case 'u':
550	if (hi >= 0xd800 && hi < 0xdc00)
551	{	1050	{
552	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1051	UV lo, hi;
553	ERR ("missing low surrogate character in surrogate pair");	1052	++dec_cur;
554		1053
555	dec->cur += 2;	1054	dec->cur = dec_cur;
556
557	lo = decode_4hex (dec);	1055	hi = decode_4hex (dec);
		1056	dec_cur = dec->cur;
558	if (lo == (UV)-1)	1057	if (hi == (UV)-1)
559	goto fail;	1058	goto fail;
560		1059
		1060	// possibly a surrogate pair
		1061	if (hi >= 0xd800)
		1062	if (hi < 0xdc00)
		1063	{
		1064	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		1065	ERR ("missing low surrogate character in surrogate pair");
		1066
		1067	dec_cur += 2;
		1068
		1069	dec->cur = dec_cur;
		1070	lo = decode_4hex (dec);
		1071	dec_cur = dec->cur;
		1072	if (lo == (UV)-1)
		1073	goto fail;
		1074
561	if (lo < 0xdc00 || lo >= 0xe000)	1075	if (lo < 0xdc00 || lo >= 0xe000)
562	ERR ("surrogate pair expected");	1076	ERR ("surrogate pair expected");
563		1077
564	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	1078	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		1079	}
		1080	else if (hi < 0xe000)
		1081	ERR ("missing high surrogate character in surrogate pair");
		1082
		1083	if (hi >= 0x80)
		1084	{
		1085	utf8 = 1;
		1086
		1087	cur = encode_utf8 (cur, hi);
		1088	}
		1089	else
		1090	*cur++ = hi;
565	}	1091	}
566	else if (hi >= 0xdc00 && hi < 0xe000)
567	ERR ("missing high surrogate character in surrogate pair");
568
569	if (hi >= 0x80)
570	{	1092	break;
571	utf8 = 1;
572		1093
573	APPEND_GROW (4); // at most 4 bytes for 21 bits
574	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
575	}
576	else	1094	default:
577	APPEND_CH (hi);	1095	--dec_cur;
		1096	ERR ("illegal backslash escape sequence in string");
578	}	1097	}
579	break;	1098	}
		1099	else if (expect_true (ch >= 0x20 && ch < 0x80))
		1100	*cur++ = ch;
		1101	else if (ch >= 0x80)
		1102	{
		1103	STRLEN clen;
580		1104
581	default:
582	--dec->cur;	1105	--dec_cur;
583	ERR ("illegal backslash escape sequence in string");	1106
		1107	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		1108	if (clen == (STRLEN)-1)
		1109	ERR ("malformed UTF-8 character in JSON string");
		1110
		1111	do
		1112	*cur++ = *dec_cur++;
		1113	while (--clen);
		1114
		1115	utf8 = 1;
		1116	}
		1117	else
		1118	{
		1119	--dec_cur;
		1120
		1121	if (!ch)
		1122	ERR ("unexpected end of string while parsing JSON string");
		1123	else
		1124	ERR ("invalid character encountered while parsing JSON string");
584	}	1125	}
585	}	1126	}
586	else if (ch >= 0x20 && ch <= 0x7f)	1127	while (cur < buf + SHORT_STRING_LEN);
587	APPEND_CH (*dec->cur++);	1128
588	else if (ch >= 0x80)
589	{	1129	{
590	STRLEN clen;	1130	STRLEN len = cur - buf;
591	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
592	if (clen == (STRLEN)-1)
593	ERR ("malformed UTF-8 character in JSON string");
594		1131
595	APPEND_GROW (clen);	1132	if (sv)
596	do
597	{	1133	{
598	*cur++ = *dec->cur++;	1134	STRLEN cur = SvCUR (sv);
		1135
		1136	if (SvLEN (sv) <= cur + len)
		1137	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1138
		1139	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		1140	SvCUR_set (sv, SvCUR (sv) + len);
599	}	1141	}
600	while (--clen);
601
602	utf8 = 1;
603	}
604	else if (dec->cur == dec->end)
605	ERR ("unexpected end of string while parsing json string");
606	else	1142	else
607	ERR ("invalid character encountered");	1143	sv = newSVpvn (buf, len);
608	}	1144	}
		1145	}
		1146	while (*dec_cur != '"');
609		1147
610	++dec->cur;	1148	++dec_cur;
611		1149
612	SvCUR_set (sv, cur - SvPVX (sv));	1150	if (sv)
613		1151	{
614	SvPOK_only (sv);	1152	SvPOK_only (sv);
615	*SvEND (sv) = 0;	1153	*SvEND (sv) = 0;
616		1154
617	if (utf8)	1155	if (utf8)
618	SvUTF8_on (sv);	1156	SvUTF8_on (sv);
		1157	}
		1158	else
		1159	sv = newSVpvn ("", 0);
619		1160
620	if (dec->flags & F_SHRINK)	1161	dec->cur = dec_cur;
621	shrink (sv);
622
623	return sv;	1162	return sv;
624		1163
625	fail:	1164	fail:
626	SvREFCNT_dec (sv);	1165	dec->cur = dec_cur;
627	return 0;	1166	return 0;
628	}	1167	}
629		1168
630	static SV *	1169	static SV *
631	decode_num (dec_t *dec)	1170	decode_num (dec_t *dec)
…		…
689	is_nv = 1;	1228	is_nv = 1;
690	}	1229	}
691		1230
692	if (!is_nv)	1231	if (!is_nv)
693	{	1232	{
694	UV uv;	1233	int len = dec->cur - start;
695	int numtype = grok_number (start, dec->cur - start, &uv);	1234
696	if (numtype & IS_NUMBER_IN_UV)	1235	// special case the rather common 1..5-digit-int case
697	if (numtype & IS_NUMBER_NEG)	1236	if (*start == '-')
		1237	switch (len)
698	{	1238	{
699	if (uv < (UV)IV_MIN)	1239	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
700	return newSViv (-(IV)uv);	1240	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1241	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1242	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1243	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
701	}	1244	}
		1245	else
		1246	switch (len)
		1247	{
		1248	case 1: return newSViv ( start [0] - '0' * 1);
		1249	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1250	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1251	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1252	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1253	}
		1254
		1255	{
		1256	UV uv;
		1257	int numtype = grok_number (start, len, &uv);
		1258	if (numtype & IS_NUMBER_IN_UV)
		1259	if (numtype & IS_NUMBER_NEG)
		1260	{
		1261	if (uv < (UV)IV_MIN)
		1262	return newSViv (-(IV)uv);
		1263	}
702	else	1264	else
703	return newSVuv (uv);	1265	return newSVuv (uv);
704	}	1266	}
705		1267
		1268	len -= *start == '-' ? 1 : 0;
		1269
		1270	// does not fit into IV or UV, try NV
		1271	if (len <= NV_DIG)
		1272	// fits into NV without loss of precision
		1273	return newSVnv (json_atof (start));
		1274
		1275	// everything else fails, convert it to a string
		1276	return newSVpvn (start, dec->cur - start);
		1277	}
		1278
		1279	// loss of precision here
706	return newSVnv (Atof (start));	1280	return newSVnv (json_atof (start));
707		1281
708	fail:	1282	fail:
709	return 0;	1283	return 0;
710	}	1284	}
711		1285
712	static SV *	1286	static SV *
713	decode_av (dec_t *dec)	1287	decode_av (dec_t *dec)
714	{	1288	{
715	AV *av = newAV ();	1289	AV *av = newAV ();
716		1290
717	WS;	1291	DEC_INC_DEPTH;
		1292	decode_ws (dec);
		1293
718	if (*dec->cur == ']')	1294	if (*dec->cur == ']')
719	++dec->cur;	1295	++dec->cur;
720	else	1296	else
721	for (;;)	1297	for (;;)
722	{	1298	{
…		…
726	if (!value)	1302	if (!value)
727	goto fail;	1303	goto fail;
728		1304
729	av_push (av, value);	1305	av_push (av, value);
730		1306
731	WS;	1307	decode_ws (dec);
732		1308
733	if (*dec->cur == ']')	1309	if (*dec->cur == ']')
734	{	1310	{
735	++dec->cur;	1311	++dec->cur;
736	break;	1312	break;
737	}	1313	}
738		1314
739	if (*dec->cur != ',')	1315	if (*dec->cur != ',')
740	ERR (", or ] expected while parsing array");	1316	ERR (", or ] expected while parsing array");
741		1317
742	++dec->cur;	1318	++dec->cur;
		1319
		1320	decode_ws (dec);
		1321
		1322	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1323	{
		1324	++dec->cur;
		1325	break;
		1326	}
743	}	1327	}
744		1328
		1329	DEC_DEC_DEPTH;
745	return newRV_noinc ((SV *)av);	1330	return newRV_noinc ((SV *)av);
746		1331
747	fail:	1332	fail:
748	SvREFCNT_dec (av);	1333	SvREFCNT_dec (av);
		1334	DEC_DEC_DEPTH;
749	return 0;	1335	return 0;
750	}	1336	}
751		1337
752	static SV *	1338	static SV *
753	decode_hv (dec_t *dec)	1339	decode_hv (dec_t *dec)
754	{	1340	{
		1341	SV *sv;
755	HV *hv = newHV ();	1342	HV *hv = newHV ();
756		1343
757	WS;	1344	DEC_INC_DEPTH;
		1345	decode_ws (dec);
		1346
758	if (*dec->cur == '}')	1347	if (*dec->cur == '}')
759	++dec->cur;	1348	++dec->cur;
760	else	1349	else
761	for (;;)	1350	for (;;)
762	{	1351	{
763	SV *key, *value;
764
765	WS; EXPECT_CH ('"');	1352	EXPECT_CH ('"');
766		1353
767	key = decode_str (dec);	1354	// heuristic: assume that
768	if (!key)	1355	// a) decode_str + hv_store_ent are abysmally slow.
769	goto fail;	1356	// b) most hash keys are short, simple ascii text.
		1357	// => try to "fast-match" such strings to avoid
		1358	// the overhead of decode_str + hv_store_ent.
		1359	{
		1360	SV *value;
		1361	char *p = dec->cur;
		1362	char *e = p + 24; // only try up to 24 bytes
770		1363
771	WS; EXPECT_CH (':');	1364	for (;;)
772
773	value = decode_sv (dec);
774	if (!value)
775	{	1365	{
		1366	// the >= 0x80 is false on most architectures
		1367	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1368	{
		1369	// slow path, back up and use decode_str
		1370	SV *key = decode_str (dec);
		1371	if (!key)
		1372	goto fail;
		1373
		1374	decode_ws (dec); EXPECT_CH (':');
		1375
		1376	decode_ws (dec);
		1377	value = decode_sv (dec);
		1378	if (!value)
		1379	{
		1380	SvREFCNT_dec (key);
		1381	goto fail;
		1382	}
		1383
		1384	hv_store_ent (hv, key, value, 0);
776	SvREFCNT_dec (key);	1385	SvREFCNT_dec (key);
		1386
		1387	break;
		1388	}
		1389	else if (*p == '"')
		1390	{
		1391	// fast path, got a simple key
		1392	char *key = dec->cur;
		1393	int len = p - key;
		1394	dec->cur = p + 1;
		1395
		1396	decode_ws (dec); EXPECT_CH (':');
		1397
		1398	decode_ws (dec);
		1399	value = decode_sv (dec);
		1400	if (!value)
777	goto fail;	1401	goto fail;
		1402
		1403	hv_store (hv, key, len, value, 0);
		1404
		1405	break;
		1406	}
		1407
		1408	++p;
778	}	1409	}
779
780	//TODO: optimise
781	hv_store_ent (hv, key, value, 0);
782
783	WS;	1410	}
		1411
		1412	decode_ws (dec);
784		1413
785	if (*dec->cur == '}')	1414	if (*dec->cur == '}')
786	{	1415	{
787	++dec->cur;	1416	++dec->cur;
788	break;	1417	break;
…		…
790		1419
791	if (*dec->cur != ',')	1420	if (*dec->cur != ',')
792	ERR (", or } expected while parsing object/hash");	1421	ERR (", or } expected while parsing object/hash");
793		1422
794	++dec->cur;	1423	++dec->cur;
		1424
		1425	decode_ws (dec);
		1426
		1427	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1428	{
		1429	++dec->cur;
		1430	break;
		1431	}
795	}	1432	}
796		1433
		1434	DEC_DEC_DEPTH;
797	return newRV_noinc ((SV *)hv);	1435	sv = newRV_noinc ((SV *)hv);
		1436
		1437	// check filter callbacks
		1438	if (dec->json.flags & F_HOOK)
		1439	{
		1440	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1441	{
		1442	HE *cb, *he;
		1443
		1444	hv_iterinit (hv);
		1445	he = hv_iternext (hv);
		1446	hv_iterinit (hv);
		1447
		1448	// the next line creates a mortal sv each time its called.
		1449	// might want to optimise this for common cases.
		1450	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1451
		1452	if (cb)
		1453	{
		1454	dSP;
		1455	int count;
		1456
		1457	ENTER; SAVETMPS; PUSHMARK (SP);
		1458	XPUSHs (HeVAL (he));
		1459	sv_2mortal (sv);
		1460
		1461	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1462
		1463	if (count == 1)
		1464	{
		1465	sv = newSVsv (POPs);
		1466	FREETMPS; LEAVE;
		1467	return sv;
		1468	}
		1469
		1470	SvREFCNT_inc (sv);
		1471	FREETMPS; LEAVE;
		1472	}
		1473	}
		1474
		1475	if (dec->json.cb_object)
		1476	{
		1477	dSP;
		1478	int count;
		1479
		1480	ENTER; SAVETMPS; PUSHMARK (SP);
		1481	XPUSHs (sv_2mortal (sv));
		1482
		1483	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1484
		1485	if (count == 1)
		1486	{
		1487	sv = newSVsv (POPs);
		1488	FREETMPS; LEAVE;
		1489	return sv;
		1490	}
		1491
		1492	SvREFCNT_inc (sv);
		1493	FREETMPS; LEAVE;
		1494	}
		1495	}
		1496
		1497	return sv;
798		1498
799	fail:	1499	fail:
800	SvREFCNT_dec (hv);	1500	SvREFCNT_dec (hv);
		1501	DEC_DEC_DEPTH;
		1502	return 0;
		1503	}
		1504
		1505	static SV *
		1506	decode_tag (dec_t *dec)
		1507	{
		1508	SV *tag = 0;
		1509	SV *val = 0;
		1510
		1511	if (!(dec->json.flags & F_ALLOW_TAGS))
		1512	ERR ("malformed JSON string, neither array, object, number, string or atom");
		1513
		1514	++dec->cur;
		1515
		1516	tag = decode_sv (dec);
		1517	if (!tag)
		1518	goto fail;
		1519
		1520	if (!SvPOK (tag))
		1521	ERR ("malformed JSON string, (tag) must be a string");
		1522
		1523	if (*dec->cur != ')')
		1524	ERR (") expected after tag");
		1525
		1526	++dec->cur;
		1527
		1528	val = decode_sv (dec);
		1529	if (!val)
		1530	goto fail;
		1531
		1532	if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
		1533	ERR ("malformed JSON string, tag value must be an array");
		1534
		1535	{
		1536	AV *av = (AV *)SvRV (val);
		1537	int i, len = av_len (av) + 1;
		1538	HV *stash = gv_stashsv (tag, 0);
		1539	SV *sv;
		1540
		1541	if (!stash)
		1542	ERR ("cannot decode perl-object (package does not exist)");
		1543
		1544	GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
		1545
		1546	if (!method)
		1547	ERR ("cannot decode perl-object (package does not have a THAW method)");
		1548
		1549	dSP;
		1550
		1551	ENTER; SAVETMPS; PUSHMARK (SP);
		1552	EXTEND (SP, len + 2);
		1553	// we re-bless the reference to get overload and other niceties right
		1554	PUSHs (tag);
		1555	PUSHs (sv_json);
		1556
		1557	for (i = 0; i < len; ++i)
		1558	PUSHs (*av_fetch (av, i, 1));
		1559
		1560	PUTBACK;
		1561	call_sv ((SV *)GvCV (method), G_SCALAR);
		1562	SPAGAIN;
		1563
		1564	SvREFCNT_dec (tag);
		1565	SvREFCNT_dec (val);
		1566	sv = SvREFCNT_inc (POPs);
		1567
		1568	PUTBACK;
		1569
		1570	FREETMPS; LEAVE;
		1571
		1572	return sv;
		1573	}
		1574
		1575	fail:
		1576	SvREFCNT_dec (tag);
		1577	SvREFCNT_dec (val);
801	return 0;	1578	return 0;
802	}	1579	}
803		1580
804	static SV *	1581	static SV *
805	decode_sv (dec_t *dec)	1582	decode_sv (dec_t *dec)
806	{	1583	{
807	WS;	1584	// the beauty of JSON: you need exactly one character lookahead
		1585	// to parse everything.
808	switch (*dec->cur)	1586	switch (*dec->cur)
809	{	1587	{
810	case '"': ++dec->cur; return decode_str (dec);	1588	case '"': ++dec->cur; return decode_str (dec);
811	case '[': ++dec->cur; return decode_av (dec);	1589	case '[': ++dec->cur; return decode_av (dec);
812	case '{': ++dec->cur; return decode_hv (dec);	1590	case '{': ++dec->cur; return decode_hv (dec);
		1591	case '(': return decode_tag (dec);
813		1592
814	case '-':	1593	case '-':
815	case '0': case '1': case '2': case '3': case '4':	1594	case '0': case '1': case '2': case '3': case '4':
816	case '5': case '6': case '7': case '8': case '9':	1595	case '5': case '6': case '7': case '8': case '9':
817	return decode_num (dec);	1596	return decode_num (dec);
818		1597
819	case 't':	1598	case 't':
820	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1599	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
821	{	1600	{
822	dec->cur += 4;	1601	dec->cur += 4;
		1602	#if JSON_SLOW
		1603	types_true = get_bool ("Types::Serialiser::true");
		1604	#endif
823	return newSViv (1);	1605	return newSVsv (types_true);
824	}	1606	}
825	else	1607	else
826	ERR ("'true' expected");	1608	ERR ("'true' expected");
827		1609
828	break;	1610	break;
829		1611
830	case 'f':	1612	case 'f':
831	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1613	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
832	{	1614	{
833	dec->cur += 5;	1615	dec->cur += 5;
		1616	#if JSON_SLOW
		1617	types_false = get_bool ("Types::Serialiser::false");
		1618	#endif
834	return newSViv (0);	1619	return newSVsv (types_false);
835	}	1620	}
836	else	1621	else
837	ERR ("'false' expected");	1622	ERR ("'false' expected");
838		1623
839	break;	1624	break;
…		…
848	ERR ("'null' expected");	1633	ERR ("'null' expected");
849		1634
850	break;	1635	break;
851		1636
852	default:	1637	default:
853	ERR ("malformed json string, neither array, object, number, string or atom");	1638	ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
854	break;	1639	break;
855	}	1640	}
856		1641
857	fail:	1642	fail:
858	return 0;	1643	return 0;
859	}	1644	}
860		1645
861	static SV *	1646	static SV *
862	decode_json (SV *string, UV flags)	1647	decode_json (SV *string, JSON *json, char **offset_return)
863	{	1648	{
		1649	dec_t dec;
864	SV *sv;	1650	SV *sv;
865		1651
866	if (flags & F_UTF8)	1652	/* work around bugs in 5.10 where manipulating magic values
		1653	* makes perl ignore the magic in subsequent accesses.
		1654	* also make a copy of non-PV values, to get them into a clean
		1655	* state (SvPV should do that, but it's buggy, see below).
		1656	*/
		1657	/*SvGETMAGIC (string);*/
		1658	if (SvMAGICAL (string) || !SvPOK (string))
		1659	string = sv_2mortal (newSVsv (string));
		1660
		1661	SvUPGRADE (string, SVt_PV);
		1662
		1663	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1664	* assertion with -DDEBUGGING, although SvCUR is documented to
		1665	* return the xpv_cur field which certainly exists after upgrading.
		1666	* according to nicholas clark, calling SvPOK fixes this.
		1667	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1668	* and hope for the best.
		1669	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1670	* assertion business is seriously broken, try yet another workaround
		1671	* for the broken -DDEBUGGING.
		1672	*/
		1673	{
		1674	#ifdef DEBUGGING
		1675	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1676	#else
		1677	STRLEN offset = SvCUR (string);
		1678	#endif
		1679
		1680	if (offset > json->max_size && json->max_size)
		1681	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1682	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1683	}
		1684
		1685	if (DECODE_WANTS_OCTETS (json))
867	sv_utf8_downgrade (string, 0);	1686	sv_utf8_downgrade (string, 0);
868	else	1687	else
869	sv_utf8_upgrade (string);	1688	sv_utf8_upgrade (string);
870		1689
871	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1690	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
872		1691
873	dec_t dec;	1692	dec.json = *json;
874	dec.flags = flags;
875	dec.cur = SvPVX (string);	1693	dec.cur = SvPVX (string);
876	dec.end = SvEND (string);	1694	dec.end = SvEND (string);
877	dec.err = 0;	1695	dec.err = 0;
		1696	dec.depth = 0;
878		1697
		1698	if (dec.json.cb_object || dec.json.cb_sk_object)
		1699	dec.json.flags |= F_HOOK;
		1700
		1701	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1702
		1703	decode_ws (&dec);
879	sv = decode_sv (&dec);	1704	sv = decode_sv (&dec);
880		1705
		1706	if (offset_return)
		1707	*offset_return = dec.cur;
		1708
		1709	if (!(offset_return || !sv))
		1710	{
		1711	// check for trailing garbage
		1712	decode_ws (&dec);
		1713
		1714	if (*dec.cur)
		1715	{
		1716	dec.err = "garbage after JSON object";
		1717	SvREFCNT_dec (sv);
		1718	sv = 0;
		1719	}
		1720	}
		1721
881	if (!sv)	1722	if (!sv)
882	{	1723	{
883	IV offset = dec.flags & F_UTF8
884	? dec.cur - SvPVX (string)
885	: utf8_distance (dec.cur, SvPVX (string));
886	SV *uni = sv_newmortal ();	1724	SV *uni = sv_newmortal ();
887		1725
888	// horrible hack to silence warning inside pv_uni_display	1726	// horrible hack to silence warning inside pv_uni_display
889	COP cop = *PL_curcop;	1727	COP cop = *PL_curcop;
890	cop.cop_warnings = pWARN_NONE;	1728	cop.cop_warnings = pWARN_NONE;
…		…
892	SAVEVPTR (PL_curcop);	1730	SAVEVPTR (PL_curcop);
893	PL_curcop = &cop;	1731	PL_curcop = &cop;
894	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1732	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
895	LEAVE;	1733	LEAVE;
896		1734
897	croak ("%s, at character offset %d (%s)",	1735	croak ("%s, at character offset %d (before \"%s\")",
898	dec.err,	1736	dec.err,
899	(int)offset,	1737	(int)ptr_to_index (string, dec.cur),
900	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1738	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
901	}	1739	}
902		1740
903	sv = sv_2mortal (sv);	1741	sv = sv_2mortal (sv);
904		1742
905	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1743	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
906	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1744	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
907		1745
908	return sv;	1746	return sv;
909	}	1747	}
910		1748
		1749	/////////////////////////////////////////////////////////////////////////////
		1750	// incremental parser
		1751
		1752	static void
		1753	incr_parse (JSON *self)
		1754	{
		1755	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1756
		1757	// the state machine here is a bit convoluted and could be simplified a lot
		1758	// but this would make it slower, so...
		1759
		1760	for (;;)
		1761	{
		1762	//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
		1763	switch (self->incr_mode)
		1764	{
		1765	// only used for initial whitespace skipping
		1766	case INCR_M_WS:
		1767	for (;;)
		1768	{
		1769	if (*p > 0x20)
		1770	{
		1771	if (*p == '#')
		1772	{
		1773	self->incr_mode = INCR_M_C0;
		1774	goto incr_m_c;
		1775	}
		1776	else
		1777	{
		1778	self->incr_mode = INCR_M_JSON;
		1779	goto incr_m_json;
		1780	}
		1781	}
		1782	else if (!*p)
		1783	goto interrupt;
		1784
		1785	++p;
		1786	}
		1787
		1788	// skip a single char inside a string (for \\-processing)
		1789	case INCR_M_BS:
		1790	if (!*p)
		1791	goto interrupt;
		1792
		1793	++p;
		1794	self->incr_mode = INCR_M_STR;
		1795	goto incr_m_str;
		1796
		1797	// inside #-style comments
		1798	case INCR_M_C0:
		1799	case INCR_M_C1:
		1800	incr_m_c:
		1801	for (;;)
		1802	{
		1803	if (*p == '\n')
		1804	{
		1805	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1806	break;
		1807	}
		1808	else if (!*p)
		1809	goto interrupt;
		1810
		1811	++p;
		1812	}
		1813
		1814	break;
		1815
		1816	// inside a string
		1817	case INCR_M_STR:
		1818	incr_m_str:
		1819	for (;;)
		1820	{
		1821	if (*p == '"')
		1822	{
		1823	++p;
		1824	self->incr_mode = INCR_M_JSON;
		1825
		1826	if (!self->incr_nest)
		1827	goto interrupt;
		1828
		1829	goto incr_m_json;
		1830	}
		1831	else if (*p == '\\')
		1832	{
		1833	++p; // "virtually" consumes character after \
		1834
		1835	if (!*p) // if at end of string we have to switch modes
		1836	{
		1837	self->incr_mode = INCR_M_BS;
		1838	goto interrupt;
		1839	}
		1840	}
		1841	else if (!*p)
		1842	goto interrupt;
		1843
		1844	++p;
		1845	}
		1846
		1847	// after initial ws, outside string
		1848	case INCR_M_JSON:
		1849	incr_m_json:
		1850	for (;;)
		1851	{
		1852	switch (*p++)
		1853	{
		1854	case 0:
		1855	--p;
		1856	goto interrupt;
		1857
		1858	case 0x09:
		1859	case 0x0a:
		1860	case 0x0d:
		1861	case 0x20:
		1862	if (!self->incr_nest)
		1863	{
		1864	--p; // do not eat the whitespace, let the next round do it
		1865	goto interrupt;
		1866	}
		1867	break;
		1868
		1869	case '"':
		1870	self->incr_mode = INCR_M_STR;
		1871	goto incr_m_str;
		1872
		1873	case '[':
		1874	case '{':
		1875	case '(':
		1876	if (++self->incr_nest > self->max_depth)
		1877	croak (ERR_NESTING_EXCEEDED);
		1878	break;
		1879
		1880	case ']':
		1881	case '}':
		1882	if (--self->incr_nest <= 0)
		1883	goto interrupt;
		1884	break;
		1885
		1886	case ')':
		1887	--self->incr_nest;
		1888	break;
		1889
		1890	case '#':
		1891	self->incr_mode = INCR_M_C1;
		1892	goto incr_m_c;
		1893	}
		1894	}
		1895	}
		1896
		1897	modechange:
		1898	;
		1899	}
		1900
		1901	interrupt:
		1902	self->incr_pos = p - SvPVX (self->incr_text);
		1903	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1904	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
		1905	}
		1906
		1907	/////////////////////////////////////////////////////////////////////////////
		1908	// XS interface functions
		1909
911	MODULE = JSON::XS PACKAGE = JSON::XS	1910	MODULE = JSON::XS PACKAGE = JSON::XS
912		1911
913	BOOT:	1912	BOOT:
914	{	1913	{
915	int i;	1914	int i;
916		1915
917	memset (decode_hexdigit, 0xff, 256);
918	for (i = 10; i--; )	1916	for (i = 0; i < 256; ++i)
919	decode_hexdigit ['0' + i] = i;	1917	decode_hexdigit [i] =
		1918	i >= '0' && i <= '9' ? i - '0'
		1919	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1920	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1921	: -1;
920		1922
921	for (i = 7; i--; )
922	{
923	decode_hexdigit ['a' + i] = 10 + i;
924	decode_hexdigit ['A' + i] = 10 + i;
925	}
926
927	json_stash = gv_stashpv ("JSON::XS", 1);	1923	json_stash = gv_stashpv ("JSON::XS" , 1);
		1924	types_boolean_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
		1925
		1926	types_true = get_bool ("Types::Serialiser::true");
		1927	types_false = get_bool ("Types::Serialiser::false");
		1928
		1929	sv_json = newSVpv ("JSON", 0);
		1930	SvREADONLY_on (sv_json);
		1931
		1932	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
928	}	1933	}
929		1934
930	PROTOTYPES: DISABLE	1935	PROTOTYPES: DISABLE
931		1936
932	SV *new (char *dummy)	1937	void CLONE (...)
933	CODE:	1938	CODE:
934	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1939	json_stash = 0;
		1940	types_boolean_stash = 0;
		1941
		1942	void new (char *klass)
		1943	PPCODE:
		1944	{
		1945	SV *pv = NEWSV (0, sizeof (JSON));
		1946	SvPOK_only (pv);
		1947	json_init ((JSON *)SvPVX (pv));
		1948	XPUSHs (sv_2mortal (sv_bless (
		1949	newRV_noinc (pv),
		1950	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1951	)));
		1952	}
		1953
		1954	void ascii (JSON *self, int enable = 1)
		1955	ALIAS:
		1956	ascii = F_ASCII
		1957	latin1 = F_LATIN1
		1958	utf8 = F_UTF8
		1959	indent = F_INDENT
		1960	canonical = F_CANONICAL
		1961	space_before = F_SPACE_BEFORE
		1962	space_after = F_SPACE_AFTER
		1963	pretty = F_PRETTY
		1964	allow_nonref = F_ALLOW_NONREF
		1965	shrink = F_SHRINK
		1966	allow_blessed = F_ALLOW_BLESSED
		1967	convert_blessed = F_CONV_BLESSED
		1968	relaxed = F_RELAXED
		1969	allow_unknown = F_ALLOW_UNKNOWN
		1970	allow_tags = F_ALLOW_TAGS
		1971	PPCODE:
		1972	{
		1973	if (enable)
		1974	self->flags |= ix;
		1975	else
		1976	self->flags &= ~ix;
		1977
		1978	XPUSHs (ST (0));
		1979	}
		1980
		1981	void get_ascii (JSON *self)
		1982	ALIAS:
		1983	get_ascii = F_ASCII
		1984	get_latin1 = F_LATIN1
		1985	get_utf8 = F_UTF8
		1986	get_indent = F_INDENT
		1987	get_canonical = F_CANONICAL
		1988	get_space_before = F_SPACE_BEFORE
		1989	get_space_after = F_SPACE_AFTER
		1990	get_allow_nonref = F_ALLOW_NONREF
		1991	get_shrink = F_SHRINK
		1992	get_allow_blessed = F_ALLOW_BLESSED
		1993	get_convert_blessed = F_CONV_BLESSED
		1994	get_relaxed = F_RELAXED
		1995	get_allow_unknown = F_ALLOW_UNKNOWN
		1996	get_allow_tags = F_ALLOW_TAGS
		1997	PPCODE:
		1998	XPUSHs (boolSV (self->flags & ix));
		1999
		2000	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		2001	PPCODE:
		2002	self->max_depth = max_depth;
		2003	XPUSHs (ST (0));
		2004
		2005	U32 get_max_depth (JSON *self)
		2006	CODE:
		2007	RETVAL = self->max_depth;
935	OUTPUT:	2008	OUTPUT:
936	RETVAL	2009	RETVAL
937		2010
938	SV *ascii (SV *self, int enable = 1)	2011	void max_size (JSON *self, U32 max_size = 0)
939	ALIAS:	2012	PPCODE:
940	ascii = F_ASCII	2013	self->max_size = max_size;
941	utf8 = F_UTF8	2014	XPUSHs (ST (0));
942	indent = F_INDENT	2015
943	canonical = F_CANONICAL	2016	int get_max_size (JSON *self)
944	space_before = F_SPACE_BEFORE
945	space_after = F_SPACE_AFTER
946	json_rpc = F_JSON_RPC
947	pretty = F_PRETTY
948	allow_nonref = F_ALLOW_NONREF
949	shrink = F_SHRINK
950	CODE:	2017	CODE:
951	{	2018	RETVAL = self->max_size;
952	UV *uv = SvJSON (self);
953	if (enable)
954	*uv |= ix;
955	else
956	*uv &= ~ix;
957
958	RETVAL = newSVsv (self);
959	}
960	OUTPUT:	2019	OUTPUT:
961	RETVAL	2020	RETVAL
962		2021
963	void encode (SV *self, SV *scalar)	2022	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
964	PPCODE:	2023	PPCODE:
965	XPUSHs (encode_json (scalar, *SvJSON (self)));	2024	{
		2025	SvREFCNT_dec (self->cb_object);
		2026	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
966		2027
967	void decode (SV *self, SV *jsonstr)	2028	XPUSHs (ST (0));
		2029	}
		2030
		2031	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
968	PPCODE:	2032	PPCODE:
969	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	2033	{
		2034	if (!self->cb_sk_object)
		2035	self->cb_sk_object = newHV ();
		2036
		2037	if (SvOK (cb))
		2038	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		2039	else
		2040	{
		2041	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		2042
		2043	if (!HvKEYS (self->cb_sk_object))
		2044	{
		2045	SvREFCNT_dec (self->cb_sk_object);
		2046	self->cb_sk_object = 0;
		2047	}
		2048	}
		2049
		2050	XPUSHs (ST (0));
		2051	}
		2052
		2053	void encode (JSON *self, SV *scalar)
		2054	PPCODE:
		2055	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		2056	XPUSHs (scalar);
		2057
		2058	void decode (JSON *self, SV *jsonstr)
		2059	PPCODE:
		2060	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		2061	XPUSHs (jsonstr);
		2062
		2063	void decode_prefix (JSON *self, SV *jsonstr)
		2064	PPCODE:
		2065	{
		2066	SV *sv;
		2067	char *offset;
		2068	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		2069	EXTEND (SP, 2);
		2070	PUSHs (sv);
		2071	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		2072	}
		2073
		2074	void incr_parse (JSON *self, SV *jsonstr = 0)
		2075	PPCODE:
		2076	{
		2077	if (!self->incr_text)
		2078	self->incr_text = newSVpvn ("", 0);
		2079
		2080	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		2081	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		2082	if (DECODE_WANTS_OCTETS (self))
		2083	{
		2084	if (self->incr_pos)
		2085	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		2086	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		2087
		2088	sv_utf8_downgrade (self->incr_text, 0);
		2089	}
		2090	else
		2091	{
		2092	sv_utf8_upgrade (self->incr_text);
		2093
		2094	if (self->incr_pos)
		2095	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		2096	- (U8 *)SvPVX (self->incr_text);
		2097	}
		2098
		2099	// append data, if any
		2100	if (jsonstr)
		2101	{
		2102	/* make sure both strings have same encoding */
		2103	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		2104	if (SvUTF8 (jsonstr))
		2105	sv_utf8_downgrade (jsonstr, 0);
		2106	else
		2107	sv_utf8_upgrade (jsonstr);
		2108
		2109	/* and then just blindly append */
		2110	{
		2111	STRLEN len;
		2112	const char *str = SvPV (jsonstr, len);
		2113	STRLEN cur = SvCUR (self->incr_text);
		2114
		2115	if (SvLEN (self->incr_text) <= cur + len)
		2116	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		2117
		2118	Move (str, SvEND (self->incr_text), len, char);
		2119	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		2120	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		2121	}
		2122	}
		2123
		2124	if (GIMME_V != G_VOID)
		2125	do
		2126	{
		2127	SV *sv;
		2128	char *offset;
		2129
		2130	if (!INCR_DONE (self))
		2131	{
		2132	incr_parse (self);
		2133
		2134	if (self->incr_pos > self->max_size && self->max_size)
		2135	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2136	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2137
		2138	if (!INCR_DONE (self))
		2139	{
		2140	// as an optimisation, do not accumulate white space in the incr buffer
		2141	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2142	{
		2143	self->incr_pos = 0;
		2144	SvCUR_set (self->incr_text, 0);
		2145	}
		2146
		2147	break;
		2148	}
		2149	}
		2150
		2151	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2152	XPUSHs (sv);
		2153
		2154	self->incr_pos -= offset - SvPVX (self->incr_text);
		2155	self->incr_nest = 0;
		2156	self->incr_mode = 0;
		2157
		2158	sv_chop (self->incr_text, offset);
		2159	}
		2160	while (GIMME_V == G_ARRAY);
		2161	}
		2162
		2163	SV *incr_text (JSON *self)
		2164	ATTRS: lvalue
		2165	CODE:
		2166	{
		2167	if (self->incr_pos)
		2168	croak ("incr_text can not be called when the incremental parser already started parsing");
		2169
		2170	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		2171	}
		2172	OUTPUT:
		2173	RETVAL
		2174
		2175	void incr_skip (JSON *self)
		2176	CODE:
		2177	{
		2178	if (self->incr_pos)
		2179	{
		2180	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2181	self->incr_pos = 0;
		2182	self->incr_nest = 0;
		2183	self->incr_mode = 0;
		2184	}
		2185	}
		2186
		2187	void incr_reset (JSON *self)
		2188	CODE:
		2189	{
		2190	SvREFCNT_dec (self->incr_text);
		2191	self->incr_text = 0;
		2192	self->incr_pos = 0;
		2193	self->incr_nest = 0;
		2194	self->incr_mode = 0;
		2195	}
		2196
		2197	void DESTROY (JSON *self)
		2198	CODE:
		2199	SvREFCNT_dec (self->cb_sk_object);
		2200	SvREFCNT_dec (self->cb_object);
		2201	SvREFCNT_dec (self->incr_text);
970		2202
971	PROTOTYPES: ENABLE	2203	PROTOTYPES: ENABLE
972		2204
973	void to_json (SV *scalar)	2205	void encode_json (SV *scalar)
974	PPCODE:	2206	PPCODE:
975	XPUSHs (encode_json (scalar, F_UTF8));	2207	{
		2208	JSON json;
		2209	json_init (&json);
		2210	json.flags |= F_UTF8;
		2211	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2212	XPUSHs (scalar);
		2213	}
976		2214
977	void from_json (SV *jsonstr)	2215	void decode_json (SV *jsonstr)
978	PPCODE:	2216	PPCODE:
979	XPUSHs (decode_json (jsonstr, F_UTF8));	2217	{
		2218	JSON json;
		2219	json_init (&json);
		2220	json.flags |= F_UTF8;
		2221	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2222	XPUSHs (jsonstr);
		2223	}
980		2224

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