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Comparing JSON-XS/XS.xs (file contents):
Revision 1.4 by root, Thu Mar 22 21:13:58 2007 UTC vs.
Revision 1.136 by root, Thu Nov 15 22:35:35 2018 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>
		11	#include <inttypes.h>
8		12
		13	#if defined(__BORLANDC__) || defined(_MSC_VER)
		14	# define snprintf _snprintf // C compilers have this in stdio.h
		15	#endif
		16
		17	// some old perls do not have this, try to make it work, no
		18	// guarantees, though. if it breaks, you get to keep the pieces.
		19	#ifndef UTF8_MAXBYTES
		20	# define UTF8_MAXBYTES 13
		21	#endif
		22
		23	// compatibility with perl <5.18
		24	#ifndef HvNAMELEN_get
		25	# define HvNAMELEN_get(hv) strlen (HvNAME (hv))
		26	#endif
		27	#ifndef HvNAMELEN
		28	# define HvNAMELEN(hv) HvNAMELEN_get (hv)
		29	#endif
		30	#ifndef HvNAMEUTF8
		31	# define HvNAMEUTF8(hv) 0
		32	#endif
		33
		34	// three extra for rounding, sign, and end of string
		35	#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
		36
9	#define F_ASCII 0x00000001	37	#define F_ASCII 0x00000001UL
		38	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	39	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	40	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	41	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	42	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	43	#define F_SPACE_AFTER 0x00000040UL
15	#define F_JSON_RPC 0x00000040
16	#define F_ALLOW_NONREF 0x00000080	44	#define F_ALLOW_NONREF 0x00000100UL
		45	#define F_SHRINK 0x00000200UL
		46	#define F_ALLOW_BLESSED 0x00000400UL
		47	#define F_CONV_BLESSED 0x00000800UL
		48	#define F_RELAXED 0x00001000UL
		49	#define F_ALLOW_UNKNOWN 0x00002000UL
		50	#define F_ALLOW_TAGS 0x00004000UL
		51	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
17		52
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	53	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0
20		54
21	#define INIT_SIZE 32 // initial scalar size to be allocated	55	#define INIT_SIZE 64 // initial scalar size to be allocated
		56	#define INDENT_STEP 3 // spaces per indentation level
		57
		58	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
		59
		60	#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
22		61
23	#define SB do {	62	#define SB do {
24	#define SE } while (0)	63	#define SE } while (0)
25		64
26	static HV *json_stash;	65	#if __GNUC__ >= 3
		66	# define expect(expr,value) __builtin_expect ((expr), (value))
		67	# define INLINE static inline
		68	#else
		69	# define expect(expr,value) (expr)
		70	# define INLINE static
		71	#endif
		72
		73	#define expect_false(expr) expect ((expr) != 0, 0)
		74	#define expect_true(expr) expect ((expr) != 0, 1)
		75
		76	#define IN_RANGE_INC(type,val,beg,end) \
		77	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		78	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		79
		80	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		81
		82	#ifdef USE_ITHREADS
		83	# define JSON_STASH (expect_true (json_stash) ? json_stash : gv_stashpv ("JSON::XS", 1))
		84	# define BOOL_STASH (expect_true (bool_stash) ? bool_stash : gv_stashpv ("Types::Serialiser::Boolean", 1))
		85	# define GET_BOOL(value) (expect_true (bool_ ## value) ? bool_ ## value : get_bool ("Types::Serialiser::" # value))
		86	#else
		87	# define JSON_STASH json_stash
		88	# define BOOL_STASH bool_stash
		89	# define GET_BOOL(value) bool_ ## value
		90	#endif
		91
		92	// the amount of HEs to allocate on the stack, when sorting keys
		93	#define STACK_HES 64
		94
		95	static HV *json_stash, *bool_stash; // JSON::XS::, Types::Serialiser::Boolean::
		96	static SV *bool_false, *bool_true;
		97	static SV *sv_json;
		98
		99	enum {
		100	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		101	INCR_M_TFN, // inside true/false/null
		102	INCR_M_NUM, // inside number
		103	INCR_M_STR, // inside string
		104	INCR_M_BS, // inside backslash
		105	INCR_M_C0, // inside comment in initial whitespace sequence
		106	INCR_M_C1, // inside comment in other places
		107	INCR_M_JSON // outside anything, count nesting
		108	};
		109
		110	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		111
		112	typedef struct {
		113	U32 flags;
		114	U32 max_depth;
		115	STRLEN max_size;
		116
		117	SV *cb_object;
		118	HV *cb_sk_object;
		119
		120	// for the incremental parser
		121	SV *incr_text; // the source text so far
		122	STRLEN incr_pos; // the current offset into the text
		123	int incr_nest; // {[]}-nesting level
		124	unsigned char incr_mode;
		125
		126	SV *v_false, *v_true;
		127	} JSON;
		128
		129	INLINE void
		130	json_init (JSON *json)
		131	{
		132	static const JSON init = { F_ALLOW_NONREF, 512 };
		133
		134	*json = init;
		135	}
		136
		137	/////////////////////////////////////////////////////////////////////////////
		138	// utility functions
		139
		140	INLINE SV *
		141	get_bool (const char *name)
		142	{
		143	SV *sv = get_sv (name, 1);
		144
		145	SvREADONLY_on (sv);
		146	SvREADONLY_on (SvRV (sv));
		147
		148	return sv;
		149	}
		150
		151	INLINE void
		152	shrink (SV *sv)
		153	{
		154	sv_utf8_downgrade (sv, 1);
		155
		156	if (SvLEN (sv) > SvCUR (sv) + 1)
		157	{
		158	#ifdef SvPV_shrink_to_cur
		159	SvPV_shrink_to_cur (sv);
		160	#elif defined (SvPV_renew)
		161	SvPV_renew (sv, SvCUR (sv) + 1);
		162	#endif
		163	}
		164	}
		165
		166	/* adds two STRLENs together, slow, and with paranoia */
		167	STRLEN
		168	strlen_sum (STRLEN l1, STRLEN l2)
		169	{
		170	size_t sum = l1 + l2;
		171
		172	if (sum < (size_t)l2 || sum != (size_t)(STRLEN)sum)
		173	croak ("JSON::XS: string size overflow");
		174
		175	return sum;
		176	}
		177
		178	/* similar to SvGROW, but somewhat safer and guarantees exponential realloc strategy */
		179	static char *
		180	json_sv_grow (SV *sv, size_t len1, size_t len2)
		181	{
		182	len1 = strlen_sum (len1, len2);
		183	len1 = strlen_sum (len1, len1 >> 1);
		184
		185	if (len1 > 4096 - 24)
		186	len1 = (len1 | 4095) - 24;
		187
		188	return SvGROW (sv, len1);
		189	}
		190
		191	// decode a utf-8 character and return it, or (UV)-1 in
		192	// case of an error.
		193	// we special-case "safe" characters from U+80 .. U+7FF,
		194	// but use the very good perl function to parse anything else.
		195	// note that we never call this function for a ascii codepoints
		196	INLINE UV
		197	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		198	{
		199	if (expect_true (len >= 2
		200	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		201	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		202	{
		203	*clen = 2;
		204	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		205	}
		206	else
		207	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		208	}
		209
		210	// likewise for encoding, also never called for ascii codepoints
		211	// this function takes advantage of this fact, although current gccs
		212	// seem to optimise the check for >= 0x80 away anyways
		213	INLINE unsigned char *
		214	encode_utf8 (unsigned char *s, UV ch)
		215	{
		216	if (expect_false (ch < 0x000080))
		217	*s++ = ch;
		218	else if (expect_true (ch < 0x000800))
		219	*s++ = 0xc0 | ( ch >> 6),
		220	*s++ = 0x80 | ( ch & 0x3f);
		221	else if ( ch < 0x010000)
		222	*s++ = 0xe0 | ( ch >> 12),
		223	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		224	*s++ = 0x80 | ( ch & 0x3f);
		225	else if ( ch < 0x110000)
		226	*s++ = 0xf0 | ( ch >> 18),
		227	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		228	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		229	*s++ = 0x80 | ( ch & 0x3f);
		230
		231	return s;
		232	}
		233
		234	// convert offset pointer to character index, sv must be string
		235	static STRLEN
		236	ptr_to_index (SV *sv, char *offset)
		237	{
		238	return SvUTF8 (sv)
		239	? utf8_distance (offset, SvPVX (sv))
		240	: offset - SvPVX (sv);
		241	}
		242
		243	/////////////////////////////////////////////////////////////////////////////
		244	// fp hell
		245
		246	// scan a group of digits, and a trailing exponent
		247	static void
		248	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		249	{
		250	UV uaccum = 0;
		251	int eaccum = 0;
		252
		253	// if we recurse too deep, skip all remaining digits
		254	// to avoid a stack overflow attack
		255	if (expect_false (--maxdepth <= 0))
		256	while (((U8)*s - '0') < 10)
		257	++s;
		258
		259	for (;;)
		260	{
		261	U8 dig = (U8)*s - '0';
		262
		263	if (expect_false (dig >= 10))
		264	{
		265	if (dig == (U8)((U8)'.' - (U8)'0'))
		266	{
		267	++s;
		268	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		269	}
		270	else if ((dig | ' ') == 'e' - '0')
		271	{
		272	int exp2 = 0;
		273	int neg = 0;
		274
		275	++s;
		276
		277	if (*s == '-')
		278	{
		279	++s;
		280	neg = 1;
		281	}
		282	else if (*s == '+')
		283	++s;
		284
		285	while ((dig = (U8)*s - '0') < 10)
		286	exp2 = exp2 * 10 + *s++ - '0';
		287
		288	*expo += neg ? -exp2 : exp2;
		289	}
		290
		291	break;
		292	}
		293
		294	++s;
		295
		296	uaccum = uaccum * 10 + dig;
		297	++eaccum;
		298
		299	// if we have too many digits, then recurse for more
		300	// we actually do this for rather few digits
		301	if (uaccum >= (UV_MAX - 9) / 10)
		302	{
		303	if (postdp) *expo -= eaccum;
		304	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		305	if (postdp) *expo += eaccum;
		306
		307	break;
		308	}
		309	}
		310
		311	// this relies greatly on the quality of the pow ()
		312	// implementation of the platform, but a good
		313	// implementation is hard to beat.
		314	// (IEEE 754 conformant ones are required to be exact)
		315	if (postdp) *expo -= eaccum;
		316	*accum += uaccum * Perl_pow (10., *expo);
		317	*expo += eaccum;
		318	}
		319
		320	static NV
		321	json_atof (const char *s)
		322	{
		323	NV accum = 0.;
		324	int expo = 0;
		325	int neg = 0;
		326
		327	if (*s == '-')
		328	{
		329	++s;
		330	neg = 1;
		331	}
		332
		333	// a recursion depth of ten gives us >>500 bits
		334	json_atof_scan1 (s, &accum, &expo, 0, 10);
		335
		336	return neg ? -accum : accum;
		337	}
		338
		339	// target of scalar reference is bool? -1 == nope, 0 == false, 1 == true
		340	static int
		341	ref_bool_type (SV *sv)
		342	{
		343	svtype svt = SvTYPE (sv);
		344
		345	if (svt < SVt_PVAV)
		346	{
		347	STRLEN len = 0;
		348	char *pv = svt ? SvPV (sv, len) : 0;
		349
		350	if (len == 1)
		351	if (*pv == '1')
		352	return 1;
		353	else if (*pv == '0')
		354	return 0;
		355	}
		356
		357	return -1;
		358	}
		359
		360	// returns whether scalar is not a reference in the sense of allow_nonref
		361	static int
		362	json_nonref (SV *scalar)
		363	{
		364	if (!SvROK (scalar))
		365	return 1;
		366
		367	scalar = SvRV (scalar);
		368
		369	if (SvTYPE (scalar) >= SVt_PVMG)
		370	{
		371	if (SvSTASH (scalar) == bool_stash)
		372	return 1;
		373
		374	if (!SvOBJECT (scalar) && ref_bool_type (scalar) >= 0)
		375	return 1;
		376	}
		377
		378	return 0;
		379	}
		380
		381	/////////////////////////////////////////////////////////////////////////////
		382	// encoder
27		383
28	// structure used for encoding JSON	384	// structure used for encoding JSON
29	typedef struct	385	typedef struct
30	{	386	{
31	char *cur;	387	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	388	char *end; // SvEND (sv)
34	SV *sv;	389	SV *sv; // result scalar
35	UV flags;	390	JSON json;
36	int max_recurse;	391	U32 indent; // indentation level
37	int indent;	392	UV limit; // escape character values >= this value when encoding
38	} enc_t;	393	} enc_t;
39		394
40	// structure used for decoding JSON	395	INLINE void
41	typedef struct
42	{
43	char *cur;
44	char *end;
45	const char *err;
46	UV flags;
47	} dec_t;
48
49	static UV *
50	SvJSON (SV *sv)
51	{
52	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
53	croak ("object is not of type JSON::XS");
54
55	return &SvUVX (SvRV (sv));
56	}
57
58	/////////////////////////////////////////////////////////////////////////////
59
60	static void
61	need (enc_t *enc, STRLEN len)	396	need (enc_t *enc, STRLEN len)
62	{	397	{
63	if (enc->cur + len >= enc->end)	398	if (expect_false ((uintptr_t)(enc->end - enc->cur) < len))
64	{	399	{
65	STRLEN cur = enc->cur - SvPVX (enc->sv);	400	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
66	SvGROW (enc->sv, cur + len + 1);	401	char *buf = json_sv_grow (enc->sv, cur, len);
67	enc->cur = SvPVX (enc->sv) + cur;	402	enc->cur = buf + cur;
68	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	403	enc->end = buf + SvLEN (enc->sv) - 1;
69	}	404	}
70	}	405	}
71		406
72	static void	407	INLINE void
73	encode_ch (enc_t *enc, char ch)	408	encode_ch (enc_t *enc, char ch)
74	{	409	{
75	need (enc, 1);	410	need (enc, 1);
76	*enc->cur++ = ch;	411	*enc->cur++ = ch;
77	}	412	}
…		…
85		420
86	while (str < end)	421	while (str < end)
87	{	422	{
88	unsigned char ch = *(unsigned char *)str;	423	unsigned char ch = *(unsigned char *)str;
89		424
90	if (ch == '"')	425	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
91	{	426	{
		427	if (expect_false (ch == '"')) // but with slow exceptions
		428	{
92	need (enc, len += 1);	429	need (enc, len + 1);
93	*enc->cur++ = '\\';	430	*enc->cur++ = '\\';
94	*enc->cur++ = '"';	431	*enc->cur++ = '"';
95	++str;
96	}	432	}
97	else if (ch == '\\')	433	else if (expect_false (ch == '\\'))
98	{	434	{
99	need (enc, len += 1);	435	need (enc, len + 1);
100	*enc->cur++ = '\\';	436	*enc->cur++ = '\\';
101	*enc->cur++ = '\\';	437	*enc->cur++ = '\\';
102	++str;
103	}	438	}
104	else if (ch >= 0x20 && ch < 0x80) // most common case	439	else
105	{
106	*enc->cur++ = ch;	440	*enc->cur++ = ch;
107	++str;	441
108	}
109	else if (ch == '\015')
110	{
111	need (enc, len += 1);
112	*enc->cur++ = '\\';
113	*enc->cur++ = 'r';
114	++str;
115	}
116	else if (ch == '\012')
117	{
118	need (enc, len += 1);
119	*enc->cur++ = '\\';
120	*enc->cur++ = 'n';
121	++str;	442	++str;
122	}	443	}
123	else	444	else
124	{	445	{
125	STRLEN clen;	446	switch (ch)
126	UV uch;
127
128	if (is_utf8)
129	{	447	{
130	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	448	case '\010': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
131	if (clen < 0)	449	case '\011': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
132	croak ("malformed UTF-8 character in string, cannot convert to JSON");	450	case '\012': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
133	}	451	case '\014': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
134	else	452	case '\015': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
135	{
136	uch = ch;
137	clen = 1;
138	}
139		453
140	if (uch < 0x80 || enc->flags & F_ASCII)	454	default:
141	{
142	if (uch > 0xFFFFUL)
143	{	455	{
		456	STRLEN clen;
		457	UV uch;
		458
		459	if (is_utf8)
		460	{
		461	uch = decode_utf8 (str, end - str, &clen);
		462	if (clen == (STRLEN)-1)
		463	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
		464	}
		465	else
		466	{
		467	uch = ch;
		468	clen = 1;
		469	}
		470
		471	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
		472	{
		473	if (uch >= 0x10000UL)
		474	{
		475	if (uch >= 0x110000UL)
		476	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		477
144	need (enc, len += 11);	478	need (enc, len + 11);
145	sprintf (enc->cur, "\\u%04x\\u%04x",	479	sprintf (enc->cur, "\\u%04x\\u%04x",
146	(uch - 0x10000) / 0x400 + 0xD800,	480	(int)((uch - 0x10000) / 0x400 + 0xD800),
147	(uch - 0x10000) % 0x400 + 0xDC00);	481	(int)((uch - 0x10000) % 0x400 + 0xDC00));
148	enc->cur += 12;	482	enc->cur += 12;
		483	}
		484	else
		485	{
		486	need (enc, len + 5);
		487	*enc->cur++ = '\\';
		488	*enc->cur++ = 'u';
		489	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
		490	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
		491	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
		492	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
		493	}
		494
		495	str += clen;
		496	}
		497	else if (enc->json.flags & F_LATIN1)
		498	{
		499	*enc->cur++ = uch;
		500	str += clen;
		501	}
		502	else if (is_utf8)
		503	{
		504	need (enc, len + clen);
		505	do
		506	{
		507	*enc->cur++ = *str++;
		508	}
		509	while (--clen);
		510	}
		511	else
		512	{
		513	need (enc, len + UTF8_MAXBYTES - 1); // never more than 11 bytes needed
		514	enc->cur = encode_utf8 (enc->cur, uch);
		515	++str;
		516	}
149	}	517	}
150	else
151	{
152	static char hexdigit [16] = "0123456789abcdef";
153	need (enc, len += 5);
154	*enc->cur++ = '\\';
155	*enc->cur++ = 'u';
156	*enc->cur++ = hexdigit [ uch >> 12 ];
157	*enc->cur++ = hexdigit [(uch >> 8) & 15];
158	*enc->cur++ = hexdigit [(uch >> 4) & 15];
159	*enc->cur++ = hexdigit [(uch >> 0) & 15];
160	}
161
162	str += clen;
163	}
164	else if (is_utf8)
165	{
166	need (enc, len += clen);
167	while (clen--)
168	*enc->cur++ = *str++;
169	}
170	else
171	{
172	need (enc, 10); // never more than 11 bytes needed
173	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
174	++str;
175	}	518	}
176	}	519	}
177		520
178	--len;	521	--len;
179	}	522	}
180	}	523	}
181		524
182	#define INDENT SB \	525	INLINE void
		526	encode_indent (enc_t *enc)
		527	{
183	if (enc->flags & F_INDENT) \	528	if (enc->json.flags & F_INDENT)
184	{ \	529	{
185	int i_; \	530	int spaces = enc->indent * INDENT_STEP;
186	need (enc, enc->indent); \	531
187	for (i_ = enc->indent * 3; i_--; )\	532	need (enc, spaces);
		533	memset (enc->cur, ' ', spaces);
		534	enc->cur += spaces;
		535	}
		536	}
		537
		538	INLINE void
		539	encode_space (enc_t *enc)
		540	{
		541	need (enc, 1);
		542	encode_ch (enc, ' ');
		543	}
		544
		545	INLINE void
		546	encode_nl (enc_t *enc)
		547	{
		548	if (enc->json.flags & F_INDENT)
		549	{
		550	need (enc, 1);
188	encode_ch (enc, ' '); \	551	encode_ch (enc, '\n');
189	} \	552	}
190	SE	553	}
191		554
192	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	555	INLINE void
193	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	556	encode_comma (enc_t *enc)
194	#define COMMA SB \	557	{
195	encode_ch (enc, ','); \	558	encode_ch (enc, ',');
		559
196	if (enc->flags & F_INDENT) \	560	if (enc->json.flags & F_INDENT)
197	NL; \	561	encode_nl (enc);
198	else if (enc->flags & F_SPACE_AFTER) \	562	else if (enc->json.flags & F_SPACE_AFTER)
199	SPACE; \	563	encode_space (enc);
200	SE	564	}
201		565
202	static void encode_sv (enc_t *enc, SV *sv);	566	static void encode_sv (enc_t *enc, SV *sv);
203		567
204	static void	568	static void
205	encode_av (enc_t *enc, AV *av)	569	encode_av (enc_t *enc, AV *av)
206	{	570	{
207	int i, len = av_len (av);	571	int i, len = av_len (av);
208		572
		573	if (enc->indent >= enc->json.max_depth)
		574	croak (ERR_NESTING_EXCEEDED);
		575
209	encode_ch (enc, '['); NL;	576	encode_ch (enc, '[');
210	++enc->indent;
211		577
		578	if (len >= 0)
		579	{
		580	encode_nl (enc); ++enc->indent;
		581
212	for (i = 0; i <= len; ++i)	582	for (i = 0; i <= len; ++i)
213	{	583	{
214	INDENT;	584	SV **svp = av_fetch (av, i, 0);
215	encode_sv (enc, *av_fetch (av, i, 0));
216		585
		586	encode_indent (enc);
		587
		588	if (svp)
		589	encode_sv (enc, *svp);
		590	else
		591	encode_str (enc, "null", 4, 0);
		592
217	if (i < len)	593	if (i < len)
218	COMMA;	594	encode_comma (enc);
219	}	595	}
220		596
221	NL;	597	encode_nl (enc); --enc->indent; encode_indent (enc);
		598	}
222		599
223	--enc->indent;
224	INDENT; encode_ch (enc, ']');	600	encode_ch (enc, ']');
225	}	601	}
226		602
227	static void	603	static void
228	encode_he (enc_t *enc, HE *he)	604	encode_hk (enc_t *enc, HE *he)
229	{	605	{
230	encode_ch (enc, '"');	606	encode_ch (enc, '"');
231		607
232	if (HeKLEN (he) == HEf_SVKEY)	608	if (HeKLEN (he) == HEf_SVKEY)
233	{	609	{
234	SV *sv = HeSVKEY (he);	610	SV *sv = HeSVKEY (he);
235	STRLEN len;	611	STRLEN len;
236	char *str;	612	char *str;
237		613
238	SvGETMAGIC (sv);	614	SvGETMAGIC (sv);
239	str = SvPV (sv, len);	615	str = SvPV (sv, len);
240		616
241	encode_str (enc, str, len, SvUTF8 (sv));	617	encode_str (enc, str, len, SvUTF8 (sv));
242	}	618	}
243	else	619	else
244	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	620	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
245		621
246	encode_ch (enc, '"');	622	encode_ch (enc, '"');
247		623
248	if (enc->flags & F_SPACE_BEFORE) SPACE;	624	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
249	encode_ch (enc, ':');	625	encode_ch (enc, ':');
250	if (enc->flags & F_SPACE_AFTER ) SPACE;	626	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
251	encode_sv (enc, HeVAL (he));
252	}	627	}
253		628
254	// compare hash entries, used when all keys are bytestrings	629	// compare hash entries, used when all keys are bytestrings
255	static int	630	static int
256	he_cmp_fast (const void *a_, const void *b_)	631	he_cmp_fast (const void *a_, const void *b_)
…		…
261	HE *b = *(HE **)b_;	636	HE *b = *(HE **)b_;
262		637
263	STRLEN la = HeKLEN (a);	638	STRLEN la = HeKLEN (a);
264	STRLEN lb = HeKLEN (b);	639	STRLEN lb = HeKLEN (b);
265		640
266	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	641	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
267	cmp = la < lb ? -1 : la == lb ? 0 : 1;	642	cmp = lb - la;
268		643
269	return cmp;	644	return cmp;
270	}	645	}
271		646
272	// compare hash entries, used when some keys are sv's or utf-x	647	// compare hash entries, used when some keys are sv's or utf-x
273	static int	648	static int
274	he_cmp_slow (const void *a, const void *b)	649	he_cmp_slow (const void *a, const void *b)
275	{	650	{
276	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	651	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
277	}	652	}
278		653
279	static void	654	static void
280	encode_hv (enc_t *enc, HV *hv)	655	encode_hv (enc_t *enc, HV *hv)
281	{	656	{
282	int count, i;	657	HE *he;
283		658
284	encode_ch (enc, '{'); NL; ++enc->indent;	659	if (enc->indent >= enc->json.max_depth)
		660	croak (ERR_NESTING_EXCEEDED);
285		661
286	if ((count = hv_iterinit (hv)))	662	encode_ch (enc, '{');
287	{	663
288	// for canonical output we have to sort by keys first	664	// for canonical output we have to sort by keys first
289	// actually, this is mostly due to the stupid so-called	665	// actually, this is mostly due to the stupid so-called
290	// security workaround added somewhere in 5.8.x.	666	// security workaround added somewhere in 5.8.x
291	// that randomises hash orderings	667	// that randomises hash orderings
292	if (enc->flags & F_CANONICAL)	668	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		669	{
		670	int count = hv_iterinit (hv);
		671
		672	if (SvMAGICAL (hv))
293	{	673	{
294	HE *he, *hes [count];	674	// need to count by iterating. could improve by dynamically building the vector below
		675	// but I don't care for the speed of this special case.
		676	// note also that we will run into undefined behaviour when the two iterations
		677	// do not result in the same count, something I might care for in some later release.
		678
		679	count = 0;
		680	while (hv_iternext (hv))
		681	++count;
		682
		683	hv_iterinit (hv);
		684	}
		685
		686	if (count)
		687	{
295	int fast = 1;	688	int i, fast = 1;
		689	HE *hes_stack [STACK_HES];
		690	HE **hes = hes_stack;
		691
		692	// allocate larger arrays on the heap
		693	if (count > STACK_HES)
		694	{
		695	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		696	hes = (HE **)SvPVX (sv);
		697	}
296		698
297	i = 0;	699	i = 0;
298	while ((he = hv_iternext (hv)))	700	while ((he = hv_iternext (hv)))
299	{	701	{
300	hes [i++] = he;	702	hes [i++] = he;
…		…
306		708
307	if (fast)	709	if (fast)
308	qsort (hes, count, sizeof (HE *), he_cmp_fast);	710	qsort (hes, count, sizeof (HE *), he_cmp_fast);
309	else	711	else
310	{	712	{
311	// hack to disable "use bytes"	713	// hack to forcefully disable "use bytes"
312	COP *oldcop = PL_curcop, cop;	714	COP cop = *PL_curcop;
313	cop.op_private = 0;	715	cop.op_private = 0;
		716
		717	ENTER;
		718	SAVETMPS;
		719
		720	SAVEVPTR (PL_curcop);
314	PL_curcop = &cop;	721	PL_curcop = &cop;
315		722
316	SAVETMPS;
317	qsort (hes, count, sizeof (HE *), he_cmp_slow);	723	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		724
318	FREETMPS;	725	FREETMPS;
319		726	LEAVE;
320	PL_curcop = oldcop;
321	}	727	}
322		728
323	for (i = 0; i < count; ++i)	729	encode_nl (enc); ++enc->indent;
		730
		731	while (count--)
324	{	732	{
325	INDENT;	733	encode_indent (enc);
		734	he = hes [count];
326	encode_he (enc, hes [i]);	735	encode_hk (enc, he);
		736	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
327		737
328	if (i < count - 1)	738	if (count)
329	COMMA;	739	encode_comma (enc);
330	}	740	}
331		741
332	NL;	742	encode_nl (enc); --enc->indent; encode_indent (enc);
333	}	743	}
		744	}
		745	else
		746	{
		747	if (hv_iterinit (hv) || SvMAGICAL (hv))
		748	if ((he = hv_iternext (hv)))
		749	{
		750	encode_nl (enc); ++enc->indent;
		751
		752	for (;;)
		753	{
		754	encode_indent (enc);
		755	encode_hk (enc, he);
		756	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		757
		758	if (!(he = hv_iternext (hv)))
		759	break;
		760
		761	encode_comma (enc);
		762	}
		763
		764	encode_nl (enc); --enc->indent; encode_indent (enc);
		765	}
		766	}
		767
		768	encode_ch (enc, '}');
		769	}
		770
		771	// encode objects, arrays and special \0=false and \1=true values.
		772	static void
		773	encode_rv (enc_t *enc, SV *sv)
		774	{
		775	svtype svt;
		776	GV *method;
		777
		778	SvGETMAGIC (sv);
		779	svt = SvTYPE (sv);
		780
		781	if (expect_false (SvOBJECT (sv)))
		782	{
		783	HV *stash = SvSTASH (sv);
		784
		785	if (stash == bool_stash)
		786	{
		787	if (SvIV (sv)) encode_str (enc, "true" , 4, 0);
		788	else encode_str (enc, "false", 5, 0);
		789	}
		790	else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
		791	{
		792	int count;
		793	dSP;
		794
		795	ENTER; SAVETMPS;
		796	PUSHMARK (SP);
		797	EXTEND (SP, 2);
		798	// we re-bless the reference to get overload and other niceties right
		799	PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		800	PUSHs (sv_json);
		801
		802	PUTBACK;
		803	count = call_sv ((SV *)GvCV (method), G_ARRAY);
		804	SPAGAIN;
		805
		806	// catch this surprisingly common error
		807	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		808	croak ("%s::FREEZE method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		809
		810	encode_ch (enc, '(');
		811	encode_ch (enc, '"');
		812	encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
		813	encode_ch (enc, '"');
		814	encode_ch (enc, ')');
		815	encode_ch (enc, '[');
		816
		817	if (count)
		818	{
		819	int i;
		820
		821	for (i = 0; i < count - 1; ++i)
		822	{
		823	encode_sv (enc, SP[i + 1 - count]);
		824	encode_ch (enc, ',');
		825	}
		826
		827	encode_sv (enc, TOPs);
		828	SP -= count;
		829	}
		830
		831	encode_ch (enc, ']');
		832
		833	FREETMPS; LEAVE;
		834	}
		835	else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
		836	{
		837	dSP;
		838
		839	ENTER; SAVETMPS;
		840	PUSHMARK (SP);
		841	// we re-bless the reference to get overload and other niceties right
		842	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		843
		844	// calling with G_SCALAR ensures that we always get a 1 return value
		845	PUTBACK;
		846	call_sv ((SV *)GvCV (method), G_SCALAR);
		847	SPAGAIN;
		848
		849	// catch this surprisingly common error
		850	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		851	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		852
		853	sv = POPs;
		854	PUTBACK;
		855
		856	encode_sv (enc, sv);
		857
		858	FREETMPS; LEAVE;
		859	}
		860	else if (enc->json.flags & F_ALLOW_BLESSED)
		861	encode_str (enc, "null", 4, 0);
334	else	862	else
335	{	863	croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)",
336	SV *sv;	864	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
337	HE *he = hv_iternext (hv);	865	}
338		866	else if (svt == SVt_PVHV)
339	for (;;)	867	encode_hv (enc, (HV *)sv);
340	{	868	else if (svt == SVt_PVAV)
341	INDENT;	869	encode_av (enc, (AV *)sv);
342	encode_he (enc, he);	870	else if (svt < SVt_PVAV)
343
344	if (!(he = hv_iternext (hv)))
345	break;
346
347	COMMA;
348	}
349
350	NL;
351	}
352	}	871	{
		872	int bool_type = ref_bool_type (sv);
353		873
354	--enc->indent; INDENT; encode_ch (enc, '}');	874	if (bool_type == 1)
		875	encode_str (enc, "true", 4, 0);
		876	else if (bool_type == 0)
		877	encode_str (enc, "false", 5, 0);
		878	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		879	encode_str (enc, "null", 4, 0);
		880	else
		881	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		882	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		883	}
		884	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		885	encode_str (enc, "null", 4, 0);
		886	else
		887	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		888	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
355	}	889	}
356		890
357	static void	891	static void
358	encode_sv (enc_t *enc, SV *sv)	892	encode_sv (enc_t *enc, SV *sv)
359	{	893	{
…		…
367	encode_str (enc, str, len, SvUTF8 (sv));	901	encode_str (enc, str, len, SvUTF8 (sv));
368	encode_ch (enc, '"');	902	encode_ch (enc, '"');
369	}	903	}
370	else if (SvNOKp (sv))	904	else if (SvNOKp (sv))
371	{	905	{
		906	// trust that perl will do the right thing w.r.t. JSON syntax.
372	need (enc, NV_DIG + 32);	907	need (enc, NV_DIG + 32);
373	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	908	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
374	enc->cur += strlen (enc->cur);	909	enc->cur += strlen (enc->cur);
375	}	910	}
376	else if (SvIOKp (sv))	911	else if (SvIOKp (sv))
377	{	912	{
		913	// we assume we can always read an IV as a UV and vice versa
		914	// we assume two's complement
		915	// we assume no aliasing issues in the union
		916	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		917	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		918	{
		919	// optimise the "small number case"
		920	// code will likely be branchless and use only a single multiplication
		921	// works for numbers up to 59074
		922	I32 i = SvIVX (sv);
		923	U32 u;
		924	char digit, nz = 0;
		925
378	need (enc, 64);	926	need (enc, 6);
		927
		928	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		929	u = i < 0 ? -i : i;
		930
		931	// convert to 4.28 fixed-point representation
		932	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		933
		934	// now output digit by digit, each time masking out the integer part
		935	// and multiplying by 5 while moving the decimal point one to the right,
		936	// resulting in a net multiplication by 10.
		937	// we always write the digit to memory but conditionally increment
		938	// the pointer, to enable the use of conditional move instructions.
		939	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		940	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		941	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		942	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		943	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		944	}
		945	else
		946	{
		947	// large integer, use the (rather slow) snprintf way.
		948	need (enc, IVUV_MAXCHARS);
379	enc->cur +=	949	enc->cur +=
380	SvIsUV(sv)	950	SvIsUV(sv)
381	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	951	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
382	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	952	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		953	}
383	}	954	}
384	else if (SvROK (sv))	955	else if (SvROK (sv))
385	{	956	encode_rv (enc, SvRV (sv));
386	if (!--enc->max_recurse)	957	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
387	croak ("data structure too deep (hit recursion limit)");
388
389	sv = SvRV (sv);
390
391	switch (SvTYPE (sv))
392	{
393	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
394	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
395
396	default:
397	croak ("JSON can only represent references to arrays or hashes");
398	}
399	}
400	else if (!SvOK (sv))
401	encode_str (enc, "null", 4, 0);	958	encode_str (enc, "null", 4, 0);
402	else	959	else
403	croak ("encountered perl type that JSON cannot handle");	960	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
		961	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
404	}	962	}
405		963
406	static SV *	964	static SV *
407	encode_json (SV *scalar, UV flags)	965	encode_json (SV *scalar, JSON *json)
408	{	966	{
409	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
410	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
411
412	enc_t enc;	967	enc_t enc;
413	enc.flags = flags;	968
		969	if (!(json->flags & F_ALLOW_NONREF) && json_nonref (scalar))
		970	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		971
		972	enc.json = *json;
414	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	973	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
415	enc.cur = SvPVX (enc.sv);	974	enc.cur = SvPVX (enc.sv);
416	enc.end = SvEND (enc.sv);	975	enc.end = SvEND (enc.sv);
417	enc.max_recurse = 0;
418	enc.indent = 0;	976	enc.indent = 0;
		977	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		978	: enc.json.flags & F_LATIN1 ? 0x000100UL
		979	: 0x110000UL;
419		980
420	SvPOK_only (enc.sv);	981	SvPOK_only (enc.sv);
421	encode_sv (&enc, scalar);	982	encode_sv (&enc, scalar);
		983	encode_nl (&enc);
422		984
		985	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		986	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		987
423	if (!(flags & (F_ASCII | F_UTF8)))	988	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
424	SvUTF8_on (enc.sv);	989	SvUTF8_on (enc.sv);
425		990
426	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	991	if (enc.json.flags & F_SHRINK)
		992	shrink (enc.sv);
		993
427	return enc.sv;	994	return enc.sv;
428	}	995	}
429		996
430	/////////////////////////////////////////////////////////////////////////////	997	/////////////////////////////////////////////////////////////////////////////
		998	// decoder
431		999
432	#define WS \	1000	// structure used for decoding JSON
		1001	typedef struct
		1002	{
		1003	char *cur; // current parser pointer
		1004	char *end; // end of input string
		1005	const char *err; // parse error, if != 0
		1006	JSON json;
		1007	U32 depth; // recursion depth
		1008	U32 maxdepth; // recursion depth limit
		1009	} dec_t;
		1010
		1011	INLINE void
		1012	decode_comment (dec_t *dec)
		1013	{
		1014	// only '#'-style comments allowed a.t.m.
		1015
		1016	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		1017	++dec->cur;
		1018	}
		1019
		1020	INLINE void
		1021	decode_ws (dec_t *dec)
		1022	{
433	for (;;) \	1023	for (;;)
434	{ \	1024	{
435	char ch = *dec->cur; \	1025	char ch = *dec->cur;
		1026
436	if (ch > 0x20 \	1027	if (ch > 0x20)
		1028	{
		1029	if (expect_false (ch == '#'))
		1030	{
		1031	if (dec->json.flags & F_RELAXED)
		1032	decode_comment (dec);
		1033	else
		1034	break;
		1035	}
		1036	else
		1037	break;
		1038	}
437	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	1039	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
438	break; \	1040	break; // parse error, but let higher level handle it, gives better error messages
		1041
439	++dec->cur; \	1042	++dec->cur;
440	}	1043	}
		1044	}
441		1045
442	#define ERR(reason) SB dec->err = reason; goto fail; SE	1046	#define ERR(reason) SB dec->err = reason; goto fail; SE
		1047
443	#define EXPECT_CH(ch) SB \	1048	#define EXPECT_CH(ch) SB \
444	if (*dec->cur != ch) \	1049	if (*dec->cur != ch) \
445	ERR (# ch " expected"); \	1050	ERR (# ch " expected"); \
446	++dec->cur; \	1051	++dec->cur; \
447	SE	1052	SE
448		1053
		1054	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		1055	#define DEC_DEC_DEPTH --dec->depth
		1056
449	static SV *decode_sv (dec_t *dec);	1057	static SV *decode_sv (dec_t *dec);
450		1058
451	static signed char decode_hexdigit[256];	1059	static signed char decode_hexdigit[256];
452		1060
453	static UV	1061	static UV
454	decode_4hex (dec_t *dec)	1062	decode_4hex (dec_t *dec)
455	{	1063	{
456	signed char d1, d2, d3, d4;	1064	signed char d1, d2, d3, d4;
		1065	unsigned char *cur = (unsigned char *)dec->cur;
457		1066
458	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	1067	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
459	if (d1 < 0) ERR ("four hexadecimal digits expected");	1068	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
460	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	1069	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
461	if (d2 < 0) ERR ("four hexadecimal digits expected");	1070	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
462	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
463	if (d3 < 0) ERR ("four hexadecimal digits expected");
464	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
465	if (d4 < 0) ERR ("four hexadecimal digits expected");
466		1071
467	dec->cur += 4;	1072	dec->cur += 4;
468		1073
469	return ((UV)d1) << 12	1074	return ((UV)d1) << 12
470	| ((UV)d2) << 8	1075	| ((UV)d2) << 8
…		…
473		1078
474	fail:	1079	fail:
475	return (UV)-1;	1080	return (UV)-1;
476	}	1081	}
477		1082
478	#define APPEND_GROW(n) SB \
479	if (cur + (n) >= end) \
480	{ \
481	STRLEN ofs = cur - SvPVX (sv); \
482	SvGROW (sv, ofs + (n) + 1); \
483	cur = SvPVX (sv) + ofs; \
484	end = SvEND (sv); \
485	} \
486	SE
487
488	#define APPEND_CH(ch) SB \
489	APPEND_GROW (1); \
490	*cur++ = (ch); \
491	SE
492
493	static SV *	1083	static SV *
494	decode_str (dec_t *dec)	1084	decode_str (dec_t *dec)
495	{	1085	{
496	SV *sv = NEWSV (0,2);	1086	SV *sv = 0;
497	int utf8 = 0;	1087	int utf8 = 0;
498	char *cur = SvPVX (sv);	1088	char *dec_cur = dec->cur;
499	char *end = SvEND (sv);
500		1089
501	for (;;)	1090	do
502	{	1091	{
503	unsigned char ch = *(unsigned char *)dec->cur;	1092	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		1093	char *cur = buf;
504		1094
505	if (ch == '"')	1095	do
506	break;
507	else if (ch == '\\')
508	{	1096	{
509	switch (*++dec->cur)	1097	unsigned char ch = *(unsigned char *)dec_cur++;
		1098
		1099	if (expect_false (ch == '"'))
510	{	1100	{
511	case '\\':	1101	--dec_cur;
512	case '/':	1102	break;
513	case '"': APPEND_CH (*dec->cur++); break;	1103	}
514		1104	else if (expect_false (ch == '\\'))
515	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	1105	{
516	case 't': APPEND_CH ('\011'); ++dec->cur; break;	1106	switch (*dec_cur)
517	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
518	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
519	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
520
521	case 'u':
522	{	1107	{
523	UV lo, hi;	1108	case '\\':
524	++dec->cur;	1109	case '/':
		1110	case '"': *cur++ = *dec_cur++; break;
525		1111
526	hi = decode_4hex (dec);	1112	case 'b': ++dec_cur; *cur++ = '\010'; break;
527	if (hi == (UV)-1)	1113	case 't': ++dec_cur; *cur++ = '\011'; break;
528	goto fail;	1114	case 'n': ++dec_cur; *cur++ = '\012'; break;
		1115	case 'f': ++dec_cur; *cur++ = '\014'; break;
		1116	case 'r': ++dec_cur; *cur++ = '\015'; break;
529		1117
530	// possibly a surrogate pair	1118	case 'u':
531	if (hi >= 0xd800 && hi < 0xdc00)
532	{	1119	{
533	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1120	UV lo, hi;
534	ERR ("illegal surrogate character");	1121	++dec_cur;
535		1122
536	dec->cur += 2;	1123	dec->cur = dec_cur;
537
538	lo = decode_4hex (dec);	1124	hi = decode_4hex (dec);
		1125	dec_cur = dec->cur;
539	if (lo == (UV)-1)	1126	if (hi == (UV)-1)
540	goto fail;	1127	goto fail;
541		1128
		1129	// possibly a surrogate pair
		1130	if (hi >= 0xd800)
		1131	if (hi < 0xdc00)
		1132	{
		1133	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		1134	ERR ("missing low surrogate character in surrogate pair");
		1135
		1136	dec_cur += 2;
		1137
		1138	dec->cur = dec_cur;
		1139	lo = decode_4hex (dec);
		1140	dec_cur = dec->cur;
		1141	if (lo == (UV)-1)
		1142	goto fail;
		1143
542	if (lo < 0xdc00 || lo >= 0xe000)	1144	if (lo < 0xdc00 || lo >= 0xe000)
543	ERR ("surrogate pair expected");	1145	ERR ("surrogate pair expected");
544		1146
545	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	1147	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		1148	}
		1149	else if (hi < 0xe000)
		1150	ERR ("missing high surrogate character in surrogate pair");
		1151
		1152	if (hi >= 0x80)
		1153	{
		1154	utf8 = 1;
		1155
		1156	cur = encode_utf8 (cur, hi);
		1157	}
		1158	else
		1159	*cur++ = hi;
546	}	1160	}
547	else if (lo >= 0xdc00 && lo < 0xe000)
548	ERR ("illegal surrogate character");
549
550	if (hi >= 0x80)
551	{	1161	break;
552	utf8 = 1;
553		1162
554	APPEND_GROW (4); // at most 4 bytes for 21 bits
555	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
556	}
557	else	1163	default:
558	APPEND_CH (hi);	1164	--dec_cur;
		1165	ERR ("illegal backslash escape sequence in string");
559	}	1166	}
		1167	}
		1168	else if (expect_true (ch >= 0x20 && ch < 0x80))
		1169	*cur++ = ch;
		1170	else if (ch >= 0x80)
		1171	{
		1172	STRLEN clen;
		1173
		1174	--dec_cur;
		1175
		1176	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		1177	if (clen == (STRLEN)-1)
		1178	ERR ("malformed UTF-8 character in JSON string");
		1179
		1180	do
		1181	*cur++ = *dec_cur++;
		1182	while (--clen);
		1183
		1184	utf8 = 1;
		1185	}
		1186	else if (ch == '\t' && dec->json.flags & F_RELAXED)
		1187	*cur++ = ch;
		1188	else
		1189	{
		1190	--dec_cur;
		1191
		1192	if (!ch)
		1193	ERR ("unexpected end of string while parsing JSON string");
560	break;	1194	else
		1195	ERR ("invalid character encountered while parsing JSON string");
561	}	1196	}
562	}	1197	}
563	else if (ch >= 0x20 && ch <= 0x7f)	1198	while (cur < buf + SHORT_STRING_LEN);
564	APPEND_CH (*dec->cur++);	1199
565	else if (ch >= 0x80)	1200	{
		1201	STRLEN len = cur - buf;
		1202
		1203	if (sv)
566	{	1204	{
567	STRLEN clen;	1205	STRLEN cur = SvCUR (sv);
568	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
569	if (clen < 0)
570	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
571		1206
572	APPEND_GROW (clen);	1207	if (SvLEN (sv) - cur <= len)
573	memcpy (cur, dec->cur, clen);	1208	json_sv_grow (sv, cur, len);
574	cur += clen;	1209
575	dec->cur += clen;	1210	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		1211	SvCUR_set (sv, SvCUR (sv) + len);
576	}	1212	}
577	else	1213	else
578	ERR ("invalid character encountered");	1214	sv = newSVpvn (buf, len);
579	}	1215	}
		1216	}
		1217	while (*dec_cur != '"');
580		1218
581	++dec->cur;	1219	++dec_cur;
582		1220
583	SvCUR_set (sv, cur - SvPVX (sv));	1221	if (sv)
584		1222	{
585	SvPOK_only (sv);	1223	SvPOK_only (sv);
586	*SvEND (sv) = 0;	1224	*SvEND (sv) = 0;
587		1225
588	if (utf8)	1226	if (utf8)
589	SvUTF8_on (sv);	1227	SvUTF8_on (sv);
		1228	}
		1229	else
		1230	sv = newSVpvn ("", 0);
590		1231
		1232	dec->cur = dec_cur;
591	return sv;	1233	return sv;
592		1234
593	fail:	1235	fail:
594	SvREFCNT_dec (sv);	1236	dec->cur = dec_cur;
595	return 0;	1237	return 0;
596	}	1238	}
597		1239
598	static SV *	1240	static SV *
599	decode_num (dec_t *dec)	1241	decode_num (dec_t *dec)
…		…
609	{	1251	{
610	++dec->cur;	1252	++dec->cur;
611	if (*dec->cur >= '0' && *dec->cur <= '9')	1253	if (*dec->cur >= '0' && *dec->cur <= '9')
612	ERR ("malformed number (leading zero must not be followed by another digit)");	1254	ERR ("malformed number (leading zero must not be followed by another digit)");
613	}	1255	}
614		1256	else if (*dec->cur < '0' || *dec->cur > '9')
615	// int	1257	ERR ("malformed number (no digits after initial minus)");
		1258	else
		1259	do
		1260	{
		1261	++dec->cur;
		1262	}
616	while (*dec->cur >= '0' && *dec->cur <= '9')	1263	while (*dec->cur >= '0' && *dec->cur <= '9');
617	++dec->cur;
618		1264
619	// [frac]	1265	// [frac]
620	if (*dec->cur == '.')	1266	if (*dec->cur == '.')
621	{	1267	{
622	is_nv = 1;	1268	++dec->cur;
		1269
		1270	if (*dec->cur < '0' || *dec->cur > '9')
		1271	ERR ("malformed number (no digits after decimal point)");
623		1272
624	do	1273	do
625	{	1274	{
626	++dec->cur;	1275	++dec->cur;
627	}	1276	}
628	while (*dec->cur >= '0' && *dec->cur <= '9');	1277	while (*dec->cur >= '0' && *dec->cur <= '9');
		1278
		1279	is_nv = 1;
629	}	1280	}
630		1281
631	// [exp]	1282	// [exp]
632	if (*dec->cur == 'e' || *dec->cur == 'E')	1283	if (*dec->cur == 'e' || *dec->cur == 'E')
633	{	1284	{
634	is_nv = 1;
635
636	++dec->cur;	1285	++dec->cur;
		1286
637	if (*dec->cur == '-' || *dec->cur == '+')	1287	if (*dec->cur == '-' || *dec->cur == '+')
638	++dec->cur;	1288	++dec->cur;
639		1289
		1290	if (*dec->cur < '0' || *dec->cur > '9')
		1291	ERR ("malformed number (no digits after exp sign)");
		1292
		1293	do
		1294	{
		1295	++dec->cur;
		1296	}
640	while (*dec->cur >= '0' && *dec->cur <= '9')	1297	while (*dec->cur >= '0' && *dec->cur <= '9');
641	++dec->cur;	1298
		1299	is_nv = 1;
642	}	1300	}
643		1301
644	if (!is_nv)	1302	if (!is_nv)
645	{	1303	{
646	UV uv;	1304	int len = dec->cur - start;
647	int numtype = grok_number (start, dec->cur - start, &uv);	1305
648	if (numtype & IS_NUMBER_IN_UV)	1306	// special case the rather common 1..5-digit-int case
649	if (numtype & IS_NUMBER_NEG)	1307	if (*start == '-')
		1308	switch (len)
650	{	1309	{
651	if (uv < (UV)IV_MIN)	1310	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
652	return newSViv (-(IV)uv);	1311	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1312	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1313	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1314	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
653	}	1315	}
		1316	else
		1317	switch (len)
		1318	{
		1319	case 1: return newSViv ( start [0] - '0' * 1);
		1320	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1321	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1322	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1323	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1324	}
		1325
		1326	{
		1327	UV uv;
		1328	int numtype = grok_number (start, len, &uv);
		1329	if (numtype & IS_NUMBER_IN_UV)
		1330	if (numtype & IS_NUMBER_NEG)
		1331	{
		1332	if (uv < (UV)IV_MIN)
		1333	return newSViv (-(IV)uv);
		1334	}
654	else	1335	else
655	return newSVuv (uv);	1336	return newSVuv (uv);
656	}	1337	}
657		1338
		1339	len -= *start == '-' ? 1 : 0;
		1340
		1341	// does not fit into IV or UV, try NV
		1342	if (len <= NV_DIG)
		1343	// fits into NV without loss of precision
		1344	return newSVnv (json_atof (start));
		1345
		1346	// everything else fails, convert it to a string
		1347	return newSVpvn (start, dec->cur - start);
		1348	}
		1349
		1350	// loss of precision here
658	return newSVnv (Atof (start));	1351	return newSVnv (json_atof (start));
659		1352
660	fail:	1353	fail:
661	return 0;	1354	return 0;
662	}	1355	}
663		1356
664	static SV *	1357	static SV *
665	decode_av (dec_t *dec)	1358	decode_av (dec_t *dec)
666	{	1359	{
667	AV *av = newAV ();	1360	AV *av = newAV ();
668		1361
		1362	DEC_INC_DEPTH;
		1363	decode_ws (dec);
		1364
		1365	if (*dec->cur == ']')
		1366	++dec->cur;
		1367	else
669	for (;;)	1368	for (;;)
670	{	1369	{
671	SV *value;	1370	SV *value;
672		1371
673	value = decode_sv (dec);	1372	value = decode_sv (dec);
674	if (!value)	1373	if (!value)
675	goto fail;	1374	goto fail;
676		1375
677	av_push (av, value);	1376	av_push (av, value);
678		1377
679	WS;	1378	decode_ws (dec);
680		1379
681	if (*dec->cur == ']')	1380	if (*dec->cur == ']')
682	{	1381	{
683	++dec->cur;	1382	++dec->cur;
684	break;	1383	break;
685	}	1384	}
686		1385
687	if (*dec->cur != ',')	1386	if (*dec->cur != ',')
688	ERR (", or ] expected while parsing array");	1387	ERR (", or ] expected while parsing array");
689		1388
690	++dec->cur;	1389	++dec->cur;
		1390
		1391	decode_ws (dec);
		1392
		1393	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1394	{
		1395	++dec->cur;
		1396	break;
		1397	}
691	}	1398	}
692		1399
		1400	DEC_DEC_DEPTH;
693	return newRV_noinc ((SV *)av);	1401	return newRV_noinc ((SV *)av);
694		1402
695	fail:	1403	fail:
696	SvREFCNT_dec (av);	1404	SvREFCNT_dec (av);
		1405	DEC_DEC_DEPTH;
697	return 0;	1406	return 0;
698	}	1407	}
699		1408
700	static SV *	1409	static SV *
701	decode_hv (dec_t *dec)	1410	decode_hv (dec_t *dec)
702	{	1411	{
		1412	SV *sv;
703	HV *hv = newHV ();	1413	HV *hv = newHV ();
704		1414
		1415	DEC_INC_DEPTH;
		1416	decode_ws (dec);
		1417
		1418	if (*dec->cur == '}')
		1419	++dec->cur;
		1420	else
705	for (;;)	1421	for (;;)
706	{	1422	{
707	SV *key, *value;
708
709	WS; EXPECT_CH ('"');	1423	EXPECT_CH ('"');
710		1424
711	key = decode_str (dec);	1425	// heuristic: assume that
712	if (!key)	1426	// a) decode_str + hv_store_ent are abysmally slow.
713	goto fail;	1427	// b) most hash keys are short, simple ascii text.
714		1428	// => try to "fast-match" such strings to avoid
715	WS; EXPECT_CH (':');	1429	// the overhead of decode_str + hv_store_ent.
716
717	value = decode_sv (dec);
718	if (!value)
719	{	1430	{
		1431	SV *value;
		1432	char *p = dec->cur;
		1433	char *e = p + 24; // only try up to 24 bytes
		1434
		1435	for (;;)
		1436	{
		1437	// the >= 0x80 is false on most architectures
		1438	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1439	{
		1440	// slow path, back up and use decode_str
		1441	SV *key = decode_str (dec);
		1442	if (!key)
		1443	goto fail;
		1444
		1445	decode_ws (dec); EXPECT_CH (':');
		1446
		1447	decode_ws (dec);
		1448	value = decode_sv (dec);
		1449	if (!value)
		1450	{
		1451	SvREFCNT_dec (key);
		1452	goto fail;
		1453	}
		1454
		1455	hv_store_ent (hv, key, value, 0);
720	SvREFCNT_dec (key);	1456	SvREFCNT_dec (key);
		1457
		1458	break;
		1459	}
		1460	else if (*p == '"')
		1461	{
		1462	// fast path, got a simple key
		1463	char *key = dec->cur;
		1464	int len = p - key;
		1465	dec->cur = p + 1;
		1466
		1467	decode_ws (dec); EXPECT_CH (':');
		1468
		1469	decode_ws (dec);
		1470	value = decode_sv (dec);
		1471	if (!value)
721	goto fail;	1472	goto fail;
		1473
		1474	hv_store (hv, key, len, value, 0);
		1475
		1476	break;
		1477	}
		1478
		1479	++p;
		1480	}
722	}	1481	}
723		1482
724	//TODO: optimise	1483	decode_ws (dec);
725	hv_store_ent (hv, key, value, 0);
726		1484
727	WS;
728
729	if (*dec->cur == '}')	1485	if (*dec->cur == '}')
		1486	{
		1487	++dec->cur;
		1488	break;
		1489	}
		1490
		1491	if (*dec->cur != ',')
		1492	ERR (", or } expected while parsing object/hash");
		1493
		1494	++dec->cur;
		1495
		1496	decode_ws (dec);
		1497
		1498	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1499	{
		1500	++dec->cur;
		1501	break;
		1502	}
		1503	}
		1504
		1505	DEC_DEC_DEPTH;
		1506	sv = newRV_noinc ((SV *)hv);
		1507
		1508	// check filter callbacks
		1509	if (dec->json.flags & F_HOOK)
		1510	{
		1511	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
730	{	1512	{
731	++dec->cur;	1513	HE *cb, *he;
732	break;	1514
		1515	hv_iterinit (hv);
		1516	he = hv_iternext (hv);
		1517	hv_iterinit (hv);
		1518
		1519	// the next line creates a mortal sv each time it's called.
		1520	// might want to optimise this for common cases.
		1521	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1522
		1523	if (cb)
		1524	{
		1525	dSP;
		1526	int count;
		1527
		1528	ENTER; SAVETMPS;
		1529	PUSHMARK (SP);
		1530	XPUSHs (HeVAL (he));
		1531	sv_2mortal (sv);
		1532
		1533	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1534
		1535	if (count == 1)
		1536	{
		1537	sv = newSVsv (POPs);
		1538	FREETMPS; LEAVE;
		1539	return sv;
		1540	}
		1541	else if (count)
		1542	croak ("filter_json_single_key_object callbacks must not return more than one scalar");
		1543
		1544	SvREFCNT_inc (sv);
		1545	FREETMPS; LEAVE;
		1546	}
733	}	1547	}
734		1548
735	if (*dec->cur != ',')	1549	if (dec->json.cb_object)
736	ERR (", or } expected while parsing object/hash");	1550	{
		1551	dSP;
		1552	int count;
737		1553
738	++dec->cur;	1554	ENTER; SAVETMPS;
739	}	1555	PUSHMARK (SP);
		1556	XPUSHs (sv_2mortal (sv));
740		1557
741	return newRV_noinc ((SV *)hv);	1558	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1559
		1560	if (count == 1)
		1561	{
		1562	sv = newSVsv (POPs);
		1563	FREETMPS; LEAVE;
		1564	return sv;
		1565	}
		1566	else if (count)
		1567	croak ("filter_json_object callbacks must not return more than one scalar");
		1568
		1569	SvREFCNT_inc (sv);
		1570	FREETMPS; LEAVE;
		1571	}
		1572	}
		1573
		1574	return sv;
742		1575
743	fail:	1576	fail:
744	SvREFCNT_dec (hv);	1577	SvREFCNT_dec (hv);
		1578	DEC_DEC_DEPTH;
		1579	return 0;
		1580	}
		1581
		1582	static SV *
		1583	decode_tag (dec_t *dec)
		1584	{
		1585	SV *tag = 0;
		1586	SV *val = 0;
		1587
		1588	if (!(dec->json.flags & F_ALLOW_TAGS))
		1589	ERR ("malformed JSON string, neither array, object, number, string or atom");
		1590
		1591	++dec->cur;
		1592
		1593	decode_ws (dec);
		1594
		1595	tag = decode_sv (dec);
		1596	if (!tag)
		1597	goto fail;
		1598
		1599	if (!SvPOK (tag))
		1600	ERR ("malformed JSON string, (tag) must be a string");
		1601
		1602	decode_ws (dec);
		1603
		1604	if (*dec->cur != ')')
		1605	ERR (") expected after tag");
		1606
		1607	++dec->cur;
		1608
		1609	decode_ws (dec);
		1610
		1611	val = decode_sv (dec);
		1612	if (!val)
		1613	goto fail;
		1614
		1615	if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
		1616	ERR ("malformed JSON string, tag value must be an array");
		1617
		1618	{
		1619	AV *av = (AV *)SvRV (val);
		1620	int i, len = av_len (av) + 1;
		1621	HV *stash = gv_stashsv (tag, 0);
		1622	SV *sv;
		1623
		1624	if (!stash)
		1625	ERR ("cannot decode perl-object (package does not exist)");
		1626
		1627	GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
		1628
		1629	if (!method)
		1630	ERR ("cannot decode perl-object (package does not have a THAW method)");
		1631
		1632	dSP;
		1633
		1634	ENTER; SAVETMPS;
		1635	PUSHMARK (SP);
		1636	EXTEND (SP, len + 2);
		1637	// we re-bless the reference to get overload and other niceties right
		1638	PUSHs (tag);
		1639	PUSHs (sv_json);
		1640
		1641	for (i = 0; i < len; ++i)
		1642	PUSHs (*av_fetch (av, i, 1));
		1643
		1644	PUTBACK;
		1645	call_sv ((SV *)GvCV (method), G_SCALAR);
		1646	SPAGAIN;
		1647
		1648	SvREFCNT_dec (tag);
		1649	SvREFCNT_dec (val);
		1650	sv = SvREFCNT_inc (POPs);
		1651
		1652	PUTBACK;
		1653
		1654	FREETMPS; LEAVE;
		1655
		1656	return sv;
		1657	}
		1658
		1659	fail:
		1660	SvREFCNT_dec (tag);
		1661	SvREFCNT_dec (val);
745	return 0;	1662	return 0;
746	}	1663	}
747		1664
748	static SV *	1665	static SV *
749	decode_sv (dec_t *dec)	1666	decode_sv (dec_t *dec)
750	{	1667	{
751	WS;	1668	// the beauty of JSON: you need exactly one character lookahead
		1669	// to parse everything.
752	switch (*dec->cur)	1670	switch (*dec->cur)
753	{	1671	{
754	case '"': ++dec->cur; return decode_str (dec);	1672	case '"': ++dec->cur; return decode_str (dec);
755	case '[': ++dec->cur; return decode_av (dec);	1673	case '[': ++dec->cur; return decode_av (dec);
756	case '{': ++dec->cur; return decode_hv (dec);	1674	case '{': ++dec->cur; return decode_hv (dec);
		1675	case '(': return decode_tag (dec);
757		1676
758	case '-':	1677	case '-':
759	case '0': case '1': case '2': case '3': case '4':	1678	case '0': case '1': case '2': case '3': case '4':
760	case '5': case '6': case '7': case '8': case '9':	1679	case '5': case '6': case '7': case '8': case '9':
761	return decode_num (dec);	1680	return decode_num (dec);
762		1681
		1682	case 'f':
		1683	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
		1684	{
		1685	dec->cur += 5;
		1686
		1687	if (expect_false (!dec->json.v_false))
		1688	dec->json.v_false = GET_BOOL (false);
		1689
		1690	return newSVsv (dec->json.v_false);
		1691	}
		1692	else
		1693	ERR ("'false' expected");
		1694
		1695	break;
		1696
763	case 't':	1697	case 't':
764	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1698	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
765	{	1699	{
766	dec->cur += 4;	1700	dec->cur += 4;
		1701
		1702	if (expect_false (!dec->json.v_true))
		1703	dec->json.v_true = GET_BOOL (true);
		1704
767	return newSViv (1);	1705	return newSVsv (dec->json.v_true);
768	}	1706	}
769	else	1707	else
770	ERR ("'true' expected");	1708	ERR ("'true' expected");
771
772	break;
773
774	case 'f':
775	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
776	{
777	dec->cur += 5;
778	return newSViv (0);
779	}
780	else
781	ERR ("'false' expected");
782		1709
783	break;	1710	break;
784		1711
785	case 'n':	1712	case 'n':
786	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1713	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
787	{	1714	{
788	dec->cur += 4;	1715	dec->cur += 4;
789	return newSViv (1);	1716	return newSVsv (&PL_sv_undef);
790	}	1717	}
791	else	1718	else
792	ERR ("'null' expected");	1719	ERR ("'null' expected");
793		1720
794	break;	1721	break;
795		1722
796	default:	1723	default:
797	ERR ("malformed json string");	1724	ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
798	break;	1725	break;
799	}	1726	}
800		1727
801	fail:	1728	fail:
802	return 0;	1729	return 0;
803	}	1730	}
804		1731
805	static SV *	1732	static SV *
806	decode_json (SV *string, UV flags)	1733	decode_json (SV *string, JSON *json, STRLEN *offset_return)
807	{	1734	{
		1735	dec_t dec;
808	SV *sv;	1736	SV *sv;
809		1737
810	if (!(flags & F_UTF8))	1738	/* work around bugs in 5.10 where manipulating magic values
		1739	* makes perl ignore the magic in subsequent accesses.
		1740	* also make a copy of non-PV values, to get them into a clean
		1741	* state (SvPV should do that, but it's buggy, see below).
		1742	*
		1743	* SvIsCOW_shared_hash works around a bug in perl (possibly 5.16),
		1744	* as reported by Reini Urban.
		1745	*/
		1746	/*SvGETMAGIC (string);*/
		1747	if (SvMAGICAL (string) || !SvPOK (string) || SvIsCOW_shared_hash (string))
		1748	string = sv_2mortal (newSVsv (string));
		1749
		1750	SvUPGRADE (string, SVt_PV);
		1751
		1752	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1753	* assertion with -DDEBUGGING, although SvCUR is documented to
		1754	* return the xpv_cur field which certainly exists after upgrading.
		1755	* according to nicholas clark, calling SvPOK fixes this.
		1756	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1757	* and hope for the best.
		1758	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1759	* assertion business is seriously broken, try yet another workaround
		1760	* for the broken -DDEBUGGING.
		1761	*/
		1762	{
		1763	#ifdef DEBUGGING
		1764	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1765	#else
		1766	STRLEN offset = SvCUR (string);
		1767	#endif
		1768
		1769	if (offset > json->max_size && json->max_size)
		1770	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1771	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1772	}
		1773
		1774	if (DECODE_WANTS_OCTETS (json))
		1775	sv_utf8_downgrade (string, 0);
		1776	else
811	sv_utf8_upgrade (string);	1777	sv_utf8_upgrade (string);
812		1778
813	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1779	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
814		1780
815	dec_t dec;	1781	dec.json = *json;
816	dec.flags = flags;
817	dec.cur = SvPVX (string);	1782	dec.cur = SvPVX (string);
818	dec.end = SvEND (string);	1783	dec.end = SvEND (string);
819	dec.err = 0;	1784	dec.err = 0;
		1785	dec.depth = 0;
820		1786
821	*dec.end = 1; // invalid anywhere	1787	if (dec.json.cb_object || dec.json.cb_sk_object)
		1788	dec.json.flags |= F_HOOK;
		1789
		1790	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1791
		1792	decode_ws (&dec);
822	sv = decode_sv (&dec);	1793	sv = decode_sv (&dec);
823	*dec.end = 0;	1794
		1795	if (offset_return)
		1796	*offset_return = dec.cur - SvPVX (string);
		1797	else if (sv)
		1798	{
		1799	// check for trailing garbage
		1800	decode_ws (&dec);
		1801
		1802	if (dec.cur != dec.end)
		1803	{
		1804	dec.err = "garbage after JSON object";
		1805	SvREFCNT_dec (sv);
		1806	sv = 0;
		1807	}
		1808	}
824		1809
825	if (!sv)	1810	if (!sv)
826	{	1811	{
827	IV offset = utf8_distance (dec.cur, SvPVX (string));
828	SV *uni = sv_newmortal ();	1812	SV *uni = sv_newmortal ();
829		1813
		1814	// horrible hack to silence warning inside pv_uni_display
		1815	COP cop = *PL_curcop;
		1816	cop.cop_warnings = pWARN_NONE;
		1817	ENTER;
		1818	SAVEVPTR (PL_curcop);
		1819	PL_curcop = &cop;
830	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1820	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1821	LEAVE;
		1822
831	croak ("%s, at character %d (%s)",	1823	croak ("%s, at character offset %d (before \"%s\")",
832	dec.err,	1824	dec.err,
833	(int)offset,	1825	(int)ptr_to_index (string, dec.cur),
834	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1826	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
835	}	1827	}
836		1828
837	sv = sv_2mortal (sv);	1829	sv = sv_2mortal (sv);
838		1830
839	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1831	if (!(dec.json.flags & F_ALLOW_NONREF) && json_nonref (sv))
840	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1832	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
841		1833
842	return sv;	1834	return sv;
843	}	1835	}
844		1836
		1837	/////////////////////////////////////////////////////////////////////////////
		1838	// incremental parser
		1839
		1840	static void
		1841	incr_parse (JSON *self)
		1842	{
		1843	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1844
		1845	// the state machine here is a bit convoluted and could be simplified a lot
		1846	// but this would make it slower, so...
		1847
		1848	for (;;)
		1849	{
		1850	switch (self->incr_mode)
		1851	{
		1852	// reached end of a scalar, see if we are inside a nested structure or not
		1853	end_of_scalar:
		1854	self->incr_mode = INCR_M_JSON;
		1855
		1856	if (self->incr_nest) // end of a scalar inside array, object or tag
		1857	goto incr_m_json;
		1858	else // end of scalar outside structure, json text ends here
		1859	goto interrupt;
		1860
		1861	// only used for initial whitespace skipping
		1862	case INCR_M_WS:
		1863	for (;;)
		1864	{
		1865	if (*p > 0x20)
		1866	{
		1867	if (*p == '#')
		1868	{
		1869	self->incr_mode = INCR_M_C0;
		1870	goto incr_m_c;
		1871	}
		1872	else
		1873	{
		1874	self->incr_mode = INCR_M_JSON;
		1875	goto incr_m_json;
		1876	}
		1877	}
		1878	else if (!*p)
		1879	goto interrupt;
		1880
		1881	++p;
		1882	}
		1883
		1884	// skip a single char inside a string (for \\-processing)
		1885	case INCR_M_BS:
		1886	if (!*p)
		1887	goto interrupt;
		1888
		1889	++p;
		1890	self->incr_mode = INCR_M_STR;
		1891	goto incr_m_str;
		1892
		1893	// inside #-style comments
		1894	case INCR_M_C0:
		1895	case INCR_M_C1:
		1896	incr_m_c:
		1897	for (;;)
		1898	{
		1899	if (*p == '\n')
		1900	{
		1901	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1902	break;
		1903	}
		1904	else if (!*p)
		1905	goto interrupt;
		1906
		1907	++p;
		1908	}
		1909
		1910	break;
		1911
		1912	// inside true/false/null
		1913	case INCR_M_TFN:
		1914	incr_m_tfn:
		1915	for (;;)
		1916	switch (*p++)
		1917	{
		1918	case 'r': case 'u': case 'e': // tRUE, falsE, nUll
		1919	case 'a': case 'l': case 's': // fALSe, nuLL
		1920	// allowed
		1921	break;
		1922
		1923	default:
		1924	--p;
		1925	goto end_of_scalar;
		1926	}
		1927
		1928	// inside a number
		1929	case INCR_M_NUM:
		1930	incr_m_num:
		1931	for (;;)
		1932	switch (*p++)
		1933	{
		1934	case 'e': case 'E': case '.': case '+':
		1935	case '-':
		1936	case '0': case '1': case '2': case '3': case '4':
		1937	case '5': case '6': case '7': case '8': case '9':
		1938	// allowed
		1939	break;
		1940
		1941	default:
		1942	--p;
		1943	goto end_of_scalar;
		1944	}
		1945
		1946	// inside a string
		1947	case INCR_M_STR:
		1948	incr_m_str:
		1949	for (;;)
		1950	{
		1951	if (*p == '"')
		1952	{
		1953	++p;
		1954	goto end_of_scalar;
		1955	}
		1956	else if (*p == '\\')
		1957	{
		1958	++p; // "virtually" consumes character after \
		1959
		1960	if (!*p) // if at end of string we have to switch modes
		1961	{
		1962	self->incr_mode = INCR_M_BS;
		1963	goto interrupt;
		1964	}
		1965	}
		1966	else if (!*p)
		1967	goto interrupt;
		1968
		1969	++p;
		1970	}
		1971
		1972	// after initial ws, outside string
		1973	case INCR_M_JSON:
		1974	incr_m_json:
		1975	for (;;)
		1976	{
		1977	switch (*p++)
		1978	{
		1979	case 0:
		1980	--p;
		1981	goto interrupt;
		1982
		1983	case 0x09:
		1984	case 0x0a:
		1985	case 0x0d:
		1986	case 0x20:
		1987	if (!self->incr_nest)
		1988	{
		1989	--p; // do not eat the whitespace, let the next round do it
		1990	goto interrupt;
		1991	}
		1992	break;
		1993
		1994	// the following three blocks handle scalars. this makes the parser
		1995	// more strict than required inside arrays or objects, and could
		1996	// be moved to a special case on the toplevel (except strings)
		1997	case 't':
		1998	case 'f':
		1999	case 'n':
		2000	self->incr_mode = INCR_M_TFN;
		2001	goto incr_m_tfn;
		2002
		2003	case '-':
		2004	case '0': case '1': case '2': case '3': case '4':
		2005	case '5': case '6': case '7': case '8': case '9':
		2006	self->incr_mode = INCR_M_NUM;
		2007	goto incr_m_num;
		2008
		2009	case '"':
		2010	self->incr_mode = INCR_M_STR;
		2011	goto incr_m_str;
		2012
		2013	case '[':
		2014	case '{':
		2015	case '(':
		2016	if (++self->incr_nest > self->max_depth)
		2017	croak (ERR_NESTING_EXCEEDED);
		2018	break;
		2019
		2020	case ']':
		2021	case '}':
		2022	if (--self->incr_nest <= 0)
		2023	goto interrupt;
		2024	break;
		2025
		2026	case ')':
		2027	--self->incr_nest;
		2028	break;
		2029
		2030	case '#':
		2031	self->incr_mode = INCR_M_C1;
		2032	goto incr_m_c;
		2033	}
		2034	}
		2035	}
		2036
		2037	modechange:
		2038	;
		2039	}
		2040
		2041	interrupt:
		2042	self->incr_pos = p - SvPVX (self->incr_text);
		2043	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		2044	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
		2045	}
		2046
		2047	/////////////////////////////////////////////////////////////////////////////
		2048	// XS interface functions
		2049
845	MODULE = JSON::XS PACKAGE = JSON::XS	2050	MODULE = JSON::XS PACKAGE = JSON::XS
846		2051
847	BOOT:	2052	BOOT:
848	{	2053	{
849	int i;	2054	int i;
850		2055
851	memset (decode_hexdigit, 0xff, 256);
852	for (i = 10; i--; )	2056	for (i = 0; i < 256; ++i)
853	decode_hexdigit ['0' + i] = i;	2057	decode_hexdigit [i] =
		2058	i >= '0' && i <= '9' ? i - '0'
		2059	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		2060	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		2061	: -1;
854		2062
855	for (i = 7; i--; )	2063	json_stash = gv_stashpv ("JSON::XS" , 1);
856	{	2064	bool_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
857	decode_hexdigit ['a' + i] = 10 + i;	2065	bool_false = get_bool ("Types::Serialiser::false");
858	decode_hexdigit ['A' + i] = 10 + i;	2066	bool_true = get_bool ("Types::Serialiser::true");
		2067
		2068	sv_json = newSVpv ("JSON", 0);
		2069	SvREADONLY_on (sv_json);
		2070
		2071	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
		2072	}
		2073
		2074	PROTOTYPES: DISABLE
		2075
		2076	void CLONE (...)
		2077	CODE:
		2078	// as long as these writes are atomic, the race should not matter
		2079	// as existing threads either already use 0, or use the old value,
		2080	// which is sitll correct for the initial thread.
		2081	json_stash = 0;
		2082	bool_stash = 0;
		2083	bool_false = 0;
		2084	bool_true = 0;
		2085
		2086	void new (char *klass)
		2087	PPCODE:
		2088	{
		2089	SV *pv = NEWSV (0, sizeof (JSON));
		2090	SvPOK_only (pv);
		2091	json_init ((JSON *)SvPVX (pv));
		2092	XPUSHs (sv_2mortal (sv_bless (
		2093	newRV_noinc (pv),
		2094	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		2095	)));
		2096	}
		2097
		2098	void boolean_values (JSON *self, SV *v_false = 0, SV *v_true = 0)
		2099	PPCODE:
		2100	self->v_false = newSVsv (v_false);
		2101	self->v_true = newSVsv (v_true);
		2102	XPUSHs (ST (0));
		2103
		2104	void get_boolean_values (JSON *self)
		2105	PPCODE:
		2106	if (self->v_false && self->v_true)
		2107	{
		2108	EXTEND (SP, 2);
		2109	PUSHs (self->v_false);
		2110	PUSHs (self->v_true);
859	}	2111	}
860		2112
861	json_stash = gv_stashpv ("JSON::XS", 1);	2113	void ascii (JSON *self, int enable = 1)
862	}	2114	ALIAS:
		2115	ascii = F_ASCII
		2116	latin1 = F_LATIN1
		2117	utf8 = F_UTF8
		2118	indent = F_INDENT
		2119	canonical = F_CANONICAL
		2120	space_before = F_SPACE_BEFORE
		2121	space_after = F_SPACE_AFTER
		2122	pretty = F_PRETTY
		2123	allow_nonref = F_ALLOW_NONREF
		2124	shrink = F_SHRINK
		2125	allow_blessed = F_ALLOW_BLESSED
		2126	convert_blessed = F_CONV_BLESSED
		2127	relaxed = F_RELAXED
		2128	allow_unknown = F_ALLOW_UNKNOWN
		2129	allow_tags = F_ALLOW_TAGS
		2130	PPCODE:
		2131	{
		2132	if (enable)
		2133	self->flags |= ix;
		2134	else
		2135	self->flags &= ~ix;
863		2136
864	PROTOTYPES: DISABLE	2137	XPUSHs (ST (0));
		2138	}
865		2139
866	SV *new (char *dummy)	2140	void get_ascii (JSON *self)
		2141	ALIAS:
		2142	get_ascii = F_ASCII
		2143	get_latin1 = F_LATIN1
		2144	get_utf8 = F_UTF8
		2145	get_indent = F_INDENT
		2146	get_canonical = F_CANONICAL
		2147	get_space_before = F_SPACE_BEFORE
		2148	get_space_after = F_SPACE_AFTER
		2149	get_allow_nonref = F_ALLOW_NONREF
		2150	get_shrink = F_SHRINK
		2151	get_allow_blessed = F_ALLOW_BLESSED
		2152	get_convert_blessed = F_CONV_BLESSED
		2153	get_relaxed = F_RELAXED
		2154	get_allow_unknown = F_ALLOW_UNKNOWN
		2155	get_allow_tags = F_ALLOW_TAGS
		2156	PPCODE:
		2157	XPUSHs (boolSV (self->flags & ix));
		2158
		2159	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		2160	PPCODE:
		2161	self->max_depth = max_depth;
		2162	XPUSHs (ST (0));
		2163
		2164	U32 get_max_depth (JSON *self)
867	CODE:	2165	CODE:
868	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	2166	RETVAL = self->max_depth;
869	OUTPUT:	2167	OUTPUT:
870	RETVAL	2168	RETVAL
871		2169
872	SV *ascii (SV *self, int enable)	2170	void max_size (JSON *self, U32 max_size = 0)
873	ALIAS:	2171	PPCODE:
874	ascii = F_ASCII	2172	self->max_size = max_size;
875	utf8 = F_UTF8	2173	XPUSHs (ST (0));
876	indent = F_INDENT	2174
877	canonical = F_CANONICAL	2175	int get_max_size (JSON *self)
878	space_before = F_SPACE_BEFORE
879	space_after = F_SPACE_AFTER
880	json_rpc = F_JSON_RPC
881	pretty = F_PRETTY
882	allow_nonref = F_ALLOW_NONREF
883	CODE:	2176	CODE:
884	{	2177	RETVAL = self->max_size;
885	UV *uv = SvJSON (self);
886	if (enable)
887	*uv |= ix;
888	else
889	*uv &= ~ix;
890
891	RETVAL = newSVsv (self);
892	}
893	OUTPUT:	2178	OUTPUT:
894	RETVAL	2179	RETVAL
895		2180
896	void encode (SV *self, SV *scalar)	2181	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
897	PPCODE:	2182	PPCODE:
898	XPUSHs (encode_json (scalar, *SvJSON (self)));	2183	{
		2184	SvREFCNT_dec (self->cb_object);
		2185	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
899		2186
900	void decode (SV *self, SV *jsonstr)	2187	XPUSHs (ST (0));
		2188	}
		2189
		2190	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
901	PPCODE:	2191	PPCODE:
902	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	2192	{
		2193	if (!self->cb_sk_object)
		2194	self->cb_sk_object = newHV ();
		2195
		2196	if (SvOK (cb))
		2197	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		2198	else
		2199	{
		2200	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		2201
		2202	if (!HvKEYS (self->cb_sk_object))
		2203	{
		2204	SvREFCNT_dec (self->cb_sk_object);
		2205	self->cb_sk_object = 0;
		2206	}
		2207	}
		2208
		2209	XPUSHs (ST (0));
		2210	}
		2211
		2212	void encode (JSON *self, SV *scalar)
		2213	PPCODE:
		2214	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		2215	XPUSHs (scalar);
		2216
		2217	void decode (JSON *self, SV *jsonstr)
		2218	PPCODE:
		2219	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		2220	XPUSHs (jsonstr);
		2221
		2222	void decode_prefix (JSON *self, SV *jsonstr)
		2223	PPCODE:
		2224	{
		2225	SV *sv;
		2226	STRLEN offset;
		2227	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		2228	EXTEND (SP, 2);
		2229	PUSHs (sv);
		2230	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, SvPV_nolen (jsonstr) + offset))));
		2231	}
		2232
		2233	void incr_parse (JSON *self, SV *jsonstr = 0)
		2234	PPCODE:
		2235	{
		2236	if (!self->incr_text)
		2237	self->incr_text = newSVpvn ("", 0);
		2238
		2239	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		2240	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		2241	if (DECODE_WANTS_OCTETS (self))
		2242	{
		2243	if (self->incr_pos)
		2244	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		2245	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		2246
		2247	sv_utf8_downgrade (self->incr_text, 0);
		2248	}
		2249	else
		2250	{
		2251	sv_utf8_upgrade (self->incr_text);
		2252
		2253	if (self->incr_pos)
		2254	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		2255	- (U8 *)SvPVX (self->incr_text);
		2256	}
		2257
		2258	// append data, if any
		2259	if (jsonstr)
		2260	{
		2261	/* make sure both strings have same encoding */
		2262	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		2263	if (SvUTF8 (jsonstr))
		2264	sv_utf8_downgrade (jsonstr, 0);
		2265	else
		2266	sv_utf8_upgrade (jsonstr);
		2267
		2268	/* and then just blindly append */
		2269	{
		2270	STRLEN len;
		2271	const char *str = SvPV (jsonstr, len);
		2272	STRLEN cur = SvCUR (self->incr_text);
		2273
		2274	if (SvLEN (self->incr_text) - cur <= len)
		2275	json_sv_grow (self->incr_text, cur, len);
		2276
		2277	Move (str, SvEND (self->incr_text), len, char);
		2278	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		2279	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		2280	}
		2281	}
		2282
		2283	if (GIMME_V != G_VOID)
		2284	do
		2285	{
		2286	SV *sv;
		2287	STRLEN offset;
		2288
		2289	if (!INCR_DONE (self))
		2290	{
		2291	incr_parse (self);
		2292
		2293	if (self->incr_pos > self->max_size && self->max_size)
		2294	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2295	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2296
		2297	if (!INCR_DONE (self))
		2298	{
		2299	// as an optimisation, do not accumulate white space in the incr buffer
		2300	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2301	{
		2302	self->incr_pos = 0;
		2303	SvCUR_set (self->incr_text, 0);
		2304	}
		2305
		2306	break;
		2307	}
		2308	}
		2309
		2310	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2311	XPUSHs (sv);
		2312
		2313	self->incr_pos -= offset;
		2314	self->incr_nest = 0;
		2315	self->incr_mode = 0;
		2316
		2317	sv_chop (self->incr_text, SvPVX (self->incr_text) + offset);
		2318	}
		2319	while (GIMME_V == G_ARRAY);
		2320	}
		2321
		2322	SV *incr_text (JSON *self)
		2323	ATTRS: lvalue
		2324	CODE:
		2325	{
		2326	if (self->incr_pos)
		2327	croak ("incr_text can not be called when the incremental parser already started parsing");
		2328
		2329	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		2330	}
		2331	OUTPUT:
		2332	RETVAL
		2333
		2334	void incr_skip (JSON *self)
		2335	CODE:
		2336	{
		2337	if (self->incr_pos)
		2338	{
		2339	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2340	self->incr_pos = 0;
		2341	self->incr_nest = 0;
		2342	self->incr_mode = 0;
		2343	}
		2344	}
		2345
		2346	void incr_reset (JSON *self)
		2347	CODE:
		2348	{
		2349	SvREFCNT_dec (self->incr_text);
		2350	self->incr_text = 0;
		2351	self->incr_pos = 0;
		2352	self->incr_nest = 0;
		2353	self->incr_mode = 0;
		2354	}
		2355
		2356	void DESTROY (JSON *self)
		2357	CODE:
		2358	SvREFCNT_dec (self->v_false);
		2359	SvREFCNT_dec (self->v_true);
		2360	SvREFCNT_dec (self->cb_sk_object);
		2361	SvREFCNT_dec (self->cb_object);
		2362	SvREFCNT_dec (self->incr_text);
903		2363
904	PROTOTYPES: ENABLE	2364	PROTOTYPES: ENABLE
905		2365
906	void to_json (SV *scalar)	2366	void encode_json (SV *scalar)
907	PPCODE:	2367	PPCODE:
908	XPUSHs (encode_json (scalar, F_UTF8));	2368	{
		2369	JSON json;
		2370	json_init (&json);
		2371	json.flags |= F_UTF8;
		2372	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2373	XPUSHs (scalar);
		2374	}
909		2375
910	void from_json (SV *jsonstr)	2376	void decode_json (SV *jsonstr)
911	PPCODE:	2377	PPCODE:
912	XPUSHs (decode_json (jsonstr, F_UTF8));	2378	{
		2379	JSON json;
		2380	json_init (&json);
		2381	json.flags |= F_UTF8;
		2382	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2383	XPUSHs (jsonstr);
		2384	}
913		2385

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