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Comparing JSON-XS/XS.xs (file contents):
Revision 1.12 by root, Sat Mar 24 22:10:08 2007 UTC vs.
Revision 1.132 by root, Tue Sep 5 13:07:09 2017 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_ALLOW_NONREF 0x00000080	44	#define F_ALLOW_NONREF 0x00000100UL
16	#define F_SHRINK 0x00000100	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 32 // initial scalar size to be allocated
22	#define INDENT_STEP 3 // spaces per indentation level	56	#define INDENT_STEP 3 // spaces per indentation level
23		57
24	#define UTF8_MAX_LEN 11 // for perls UTF-X: max. number of octets per character
25	#define SHORT_STRING_LEN 256 // special-case strings of up to this size	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)
26		61
27	#define SB do {	62	#define SB do {
28	#define SE } while (0)	63	#define SE } while (0)
29		64
30	static HV *json_stash; // JSON::XS::	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_SLOW 1
		84	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		85	# define BOOL_STASH (bool_stash ? bool_stash : gv_stashpv ("Types::Serialiser::Boolean", 1))
		86	#else
		87	# define JSON_SLOW 0
		88	# define JSON_STASH json_stash
		89	# define BOOL_STASH bool_stash
		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_true, *bool_false, *sv_json;
		97
		98	enum {
		99	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		100	INCR_M_STR, // inside string
		101	INCR_M_BS, // inside backslash
		102	INCR_M_C0, // inside comment in initial whitespace sequence
		103	INCR_M_C1, // inside comment in other places
		104	INCR_M_JSON // outside anything, count nesting
		105	};
		106
		107	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		108
		109	typedef struct {
		110	U32 flags;
		111	U32 max_depth;
		112	STRLEN max_size;
		113
		114	SV *cb_object;
		115	HV *cb_sk_object;
		116
		117	// for the incremental parser
		118	SV *incr_text; // the source text so far
		119	STRLEN incr_pos; // the current offset into the text
		120	int incr_nest; // {[]}-nesting level
		121	unsigned char incr_mode;
		122	} JSON;
		123
		124	INLINE void
		125	json_init (JSON *json)
		126	{
		127	Zero (json, 1, JSON);
		128	json->max_depth = 512;
		129	}
31		130
32	/////////////////////////////////////////////////////////////////////////////	131	/////////////////////////////////////////////////////////////////////////////
33	// utility functions	132	// utility functions
34		133
35	static UV *	134	INLINE SV *
36	SvJSON (SV *sv)	135	get_bool (const char *name)
37	{	136	{
38	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))	137	SV *sv = get_sv (name, 1);
39	croak ("object is not of type JSON::XS");
40		138
41	return &SvUVX (SvRV (sv));	139	SvREADONLY_on (sv);
42	}	140	SvREADONLY_on (SvRV (sv));
43		141
44	static void	142	return sv;
		143	}
		144
		145	INLINE void
45	shrink (SV *sv)	146	shrink (SV *sv)
46	{	147	{
47	sv_utf8_downgrade (sv, 1);	148	sv_utf8_downgrade (sv, 1);
		149
48	if (SvLEN (sv) > SvCUR (sv) + 1)	150	if (SvLEN (sv) > SvCUR (sv) + 1)
49	{	151	{
50	#ifdef SvPV_shrink_to_cur	152	#ifdef SvPV_shrink_to_cur
51	SvPV_shrink_to_cur (sv);	153	SvPV_shrink_to_cur (sv);
52	#elif defined (SvPV_renew)	154	#elif defined (SvPV_renew)
53	SvPV_renew (sv, SvCUR (sv) + 1);	155	SvPV_renew (sv, SvCUR (sv) + 1);
54	#endif	156	#endif
55	}	157	}
56	}	158	}
57		159
		160	/* adds two STRLENs together, slow, and with paranoia */
		161	STRLEN
		162	strlen_sum (STRLEN l1, STRLEN l2)
		163	{
		164	size_t sum = l1 + l2;
		165
		166	if (sum < (size_t)l2 || sum != (size_t)(STRLEN)sum)
		167	croak ("JSON::XS: string size overflow");
		168
		169	return sum;
		170	}
		171
		172	/* similar to SvGROW, but somewhat safer and guarantees exponential realloc strategy */
		173	static char *
		174	json_sv_grow (SV *sv, size_t len1, size_t len2)
		175	{
		176	len1 = strlen_sum (len1, len2);
		177	len1 = strlen_sum (len1, len1 >> 1);
		178
		179	if (len1 > 4096 - 24)
		180	len1 = (len1 | 4095) - 24;
		181
		182	return SvGROW (sv, len1);
		183	}
		184
		185	// decode a utf-8 character and return it, or (UV)-1 in
		186	// case of an error.
		187	// we special-case "safe" characters from U+80 .. U+7FF,
		188	// but use the very good perl function to parse anything else.
		189	// note that we never call this function for a ascii codepoints
		190	INLINE UV
		191	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		192	{
		193	if (expect_true (len >= 2
		194	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		195	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		196	{
		197	*clen = 2;
		198	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		199	}
		200	else
		201	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		202	}
		203
		204	// likewise for encoding, also never called for ascii codepoints
		205	// this function takes advantage of this fact, although current gccs
		206	// seem to optimise the check for >= 0x80 away anyways
		207	INLINE unsigned char *
		208	encode_utf8 (unsigned char *s, UV ch)
		209	{
		210	if (expect_false (ch < 0x000080))
		211	*s++ = ch;
		212	else if (expect_true (ch < 0x000800))
		213	*s++ = 0xc0 | ( ch >> 6),
		214	*s++ = 0x80 | ( ch & 0x3f);
		215	else if ( ch < 0x010000)
		216	*s++ = 0xe0 | ( ch >> 12),
		217	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		218	*s++ = 0x80 | ( ch & 0x3f);
		219	else if ( ch < 0x110000)
		220	*s++ = 0xf0 | ( ch >> 18),
		221	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		222	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		223	*s++ = 0x80 | ( ch & 0x3f);
		224
		225	return s;
		226	}
		227
		228	// convert offset pointer to character index, sv must be string
		229	static STRLEN
		230	ptr_to_index (SV *sv, char *offset)
		231	{
		232	return SvUTF8 (sv)
		233	? utf8_distance (offset, SvPVX (sv))
		234	: offset - SvPVX (sv);
		235	}
		236
		237	/////////////////////////////////////////////////////////////////////////////
		238	// fp hell
		239
		240	// scan a group of digits, and a trailing exponent
		241	static void
		242	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		243	{
		244	UV uaccum = 0;
		245	int eaccum = 0;
		246
		247	// if we recurse too deep, skip all remaining digits
		248	// to avoid a stack overflow attack
		249	if (expect_false (--maxdepth <= 0))
		250	while (((U8)*s - '0') < 10)
		251	++s;
		252
		253	for (;;)
		254	{
		255	U8 dig = (U8)*s - '0';
		256
		257	if (expect_false (dig >= 10))
		258	{
		259	if (dig == (U8)((U8)'.' - (U8)'0'))
		260	{
		261	++s;
		262	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		263	}
		264	else if ((dig | ' ') == 'e' - '0')
		265	{
		266	int exp2 = 0;
		267	int neg = 0;
		268
		269	++s;
		270
		271	if (*s == '-')
		272	{
		273	++s;
		274	neg = 1;
		275	}
		276	else if (*s == '+')
		277	++s;
		278
		279	while ((dig = (U8)*s - '0') < 10)
		280	exp2 = exp2 * 10 + *s++ - '0';
		281
		282	*expo += neg ? -exp2 : exp2;
		283	}
		284
		285	break;
		286	}
		287
		288	++s;
		289
		290	uaccum = uaccum * 10 + dig;
		291	++eaccum;
		292
		293	// if we have too many digits, then recurse for more
		294	// we actually do this for rather few digits
		295	if (uaccum >= (UV_MAX - 9) / 10)
		296	{
		297	if (postdp) *expo -= eaccum;
		298	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		299	if (postdp) *expo += eaccum;
		300
		301	break;
		302	}
		303	}
		304
		305	// this relies greatly on the quality of the pow ()
		306	// implementation of the platform, but a good
		307	// implementation is hard to beat.
		308	// (IEEE 754 conformant ones are required to be exact)
		309	if (postdp) *expo -= eaccum;
		310	*accum += uaccum * Perl_pow (10., *expo);
		311	*expo += eaccum;
		312	}
		313
		314	static NV
		315	json_atof (const char *s)
		316	{
		317	NV accum = 0.;
		318	int expo = 0;
		319	int neg = 0;
		320
		321	if (*s == '-')
		322	{
		323	++s;
		324	neg = 1;
		325	}
		326
		327	// a recursion depth of ten gives us >>500 bits
		328	json_atof_scan1 (s, &accum, &expo, 0, 10);
		329
		330	return neg ? -accum : accum;
		331	}
		332
		333	// target of scalar reference is bool? -1 == nope, 0 == false, 1 == true
		334	static int
		335	ref_bool_type (SV *sv)
		336	{
		337	svtype svt = SvTYPE (sv);
		338
		339	if (svt < SVt_PVAV)
		340	{
		341	STRLEN len = 0;
		342	char *pv = svt ? SvPV (sv, len) : 0;
		343
		344	if (len == 1)
		345	if (*pv == '1')
		346	return 1;
		347	else if (*pv == '0')
		348	return 0;
		349	}
		350
		351	return -1;
		352	}
		353
		354	// returns whether scalar is not a reference in the sense of allow_nonref
		355	static int
		356	json_nonref (SV *scalar)
		357	{
		358	if (!SvROK (scalar))
		359	return 1;
		360
		361	scalar = SvRV (scalar);
		362
		363	if (SvTYPE (scalar) >= SVt_PVMG)
		364	{
		365	if (SvSTASH (scalar) == bool_stash)
		366	return 1;
		367
		368	if (!SvOBJECT (scalar) && ref_bool_type (scalar) >= 0)
		369	return 1;
		370	}
		371
		372	return 0;
		373	}
		374
58	/////////////////////////////////////////////////////////////////////////////	375	/////////////////////////////////////////////////////////////////////////////
59	// encoder	376	// encoder
60		377
61	// structure used for encoding JSON	378	// structure used for encoding JSON
62	typedef struct	379	typedef struct
63	{	380	{
64	char *cur; // SvPVX (sv) + current output position	381	char *cur; // SvPVX (sv) + current output position
65	char *end; // SvEND (sv)	382	char *end; // SvEND (sv)
66	SV *sv; // result scalar	383	SV *sv; // result scalar
67	UV flags; // F_*	384	JSON json;
68	int indent; // indentation level	385	U32 indent; // indentation level
69	int max_depth; // max. recursion level	386	UV limit; // escape character values >= this value when encoding
70	} enc_t;	387	} enc_t;
71		388
72	static void	389	INLINE void
73	need (enc_t *enc, STRLEN len)	390	need (enc_t *enc, STRLEN len)
74	{	391	{
75	if (enc->cur + len >= enc->end)	392	if (expect_false ((uintptr_t)(enc->end - enc->cur) < len))
76	{	393	{
77	STRLEN cur = enc->cur - SvPVX (enc->sv);	394	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
78	SvGROW (enc->sv, cur + len + 1);	395	char *buf = json_sv_grow (enc->sv, cur, len);
79	enc->cur = SvPVX (enc->sv) + cur;	396	enc->cur = buf + cur;
80	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	397	enc->end = buf + SvLEN (enc->sv) - 1;
81	}	398	}
82	}	399	}
83		400
84	static void	401	INLINE void
85	encode_ch (enc_t *enc, char ch)	402	encode_ch (enc_t *enc, char ch)
86	{	403	{
87	need (enc, 1);	404	need (enc, 1);
88	*enc->cur++ = ch;	405	*enc->cur++ = ch;
89	}	406	}
…		…
97		414
98	while (str < end)	415	while (str < end)
99	{	416	{
100	unsigned char ch = *(unsigned char *)str;	417	unsigned char ch = *(unsigned char *)str;
101		418
102	if (ch >= 0x20 && ch < 0x80) // most common case	419	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
103	{	420	{
104	if (ch == '"') // but with slow exceptions	421	if (expect_false (ch == '"')) // but with slow exceptions
105	{	422	{
106	need (enc, len += 1);	423	need (enc, len + 1);
107	*enc->cur++ = '\\';	424	*enc->cur++ = '\\';
108	*enc->cur++ = '"';	425	*enc->cur++ = '"';
109	}	426	}
110	else if (ch == '\\')	427	else if (expect_false (ch == '\\'))
111	{	428	{
112	need (enc, len += 1);	429	need (enc, len + 1);
113	*enc->cur++ = '\\';	430	*enc->cur++ = '\\';
114	*enc->cur++ = '\\';	431	*enc->cur++ = '\\';
115	}	432	}
116	else	433	else
117	*enc->cur++ = ch;	434	*enc->cur++ = ch;
…		…
120	}	437	}
121	else	438	else
122	{	439	{
123	switch (ch)	440	switch (ch)
124	{	441	{
125	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;	442	case '\010': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
126	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;	443	case '\011': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
127	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;	444	case '\012': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
128	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;	445	case '\014': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
129	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;	446	case '\015': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
130		447
131	default:	448	default:
132	{	449	{
133	STRLEN clen;	450	STRLEN clen;
134	UV uch;	451	UV uch;
135		452
136	if (is_utf8)	453	if (is_utf8)
137	{	454	{
138	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	455	uch = decode_utf8 (str, end - str, &clen);
139	if (clen == (STRLEN)-1)	456	if (clen == (STRLEN)-1)
140	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	457	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
141	}	458	}
142	else	459	else
143	{	460	{
144	uch = ch;	461	uch = ch;
145	clen = 1;	462	clen = 1;
146	}	463	}
147		464
148	if (uch > 0x10FFFFUL)	465	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
149	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
150
151	if (uch < 0x80 || enc->flags & F_ASCII)
152	{	466	{
153	if (uch > 0xFFFFUL)	467	if (uch >= 0x10000UL)
154	{	468	{
		469	if (uch >= 0x110000UL)
		470	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		471
155	need (enc, len += 11);	472	need (enc, len + 11);
156	sprintf (enc->cur, "\\u%04x\\u%04x",	473	sprintf (enc->cur, "\\u%04x\\u%04x",
157	(int)((uch - 0x10000) / 0x400 + 0xD800),	474	(int)((uch - 0x10000) / 0x400 + 0xD800),
158	(int)((uch - 0x10000) % 0x400 + 0xDC00));	475	(int)((uch - 0x10000) % 0x400 + 0xDC00));
159	enc->cur += 12;	476	enc->cur += 12;
160	}	477	}
161	else	478	else
162	{	479	{
163	static char hexdigit [16] = "0123456789abcdef";
164	need (enc, len += 5);	480	need (enc, len + 5);
165	*enc->cur++ = '\\';	481	*enc->cur++ = '\\';
166	*enc->cur++ = 'u';	482	*enc->cur++ = 'u';
167	*enc->cur++ = hexdigit [ uch >> 12 ];	483	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
168	*enc->cur++ = hexdigit [(uch >> 8) & 15];	484	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
169	*enc->cur++ = hexdigit [(uch >> 4) & 15];	485	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
170	*enc->cur++ = hexdigit [(uch >> 0) & 15];	486	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
171	}	487	}
172		488
		489	str += clen;
		490	}
		491	else if (enc->json.flags & F_LATIN1)
		492	{
		493	*enc->cur++ = uch;
173	str += clen;	494	str += clen;
174	}	495	}
175	else if (is_utf8)	496	else if (is_utf8)
176	{	497	{
177	need (enc, len += clen);	498	need (enc, len + clen);
178	do	499	do
179	{	500	{
180	*enc->cur++ = *str++;	501	*enc->cur++ = *str++;
181	}	502	}
182	while (--clen);	503	while (--clen);
183	}	504	}
184	else	505	else
185	{	506	{
186	need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed	507	need (enc, len + UTF8_MAXBYTES - 1); // never more than 11 bytes needed
187	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	508	enc->cur = encode_utf8 (enc->cur, uch);
188	++str;	509	++str;
189	}	510	}
190	}	511	}
191	}	512	}
192	}	513	}
193		514
194	--len;	515	--len;
195	}	516	}
196	}	517	}
197		518
198	static void	519	INLINE void
199	encode_indent (enc_t *enc)	520	encode_indent (enc_t *enc)
200	{	521	{
201	if (enc->flags & F_INDENT)	522	if (enc->json.flags & F_INDENT)
202	{	523	{
203	int spaces = enc->indent * INDENT_STEP;	524	int spaces = enc->indent * INDENT_STEP;
204		525
205	need (enc, spaces);	526	need (enc, spaces);
206	memset (enc->cur, ' ', spaces);	527	memset (enc->cur, ' ', spaces);
207	enc->cur += spaces;	528	enc->cur += spaces;
208	}	529	}
209	}	530	}
210		531
211	static void	532	INLINE void
212	encode_space (enc_t *enc)	533	encode_space (enc_t *enc)
213	{	534	{
214	need (enc, 1);	535	need (enc, 1);
215	encode_ch (enc, ' ');	536	encode_ch (enc, ' ');
216	}	537	}
217		538
218	static void	539	INLINE void
219	encode_nl (enc_t *enc)	540	encode_nl (enc_t *enc)
220	{	541	{
221	if (enc->flags & F_INDENT)	542	if (enc->json.flags & F_INDENT)
222	{	543	{
223	need (enc, 1);	544	need (enc, 1);
224	encode_ch (enc, '\n');	545	encode_ch (enc, '\n');
225	}	546	}
226	}	547	}
227		548
228	static void	549	INLINE void
229	encode_comma (enc_t *enc)	550	encode_comma (enc_t *enc)
230	{	551	{
231	encode_ch (enc, ',');	552	encode_ch (enc, ',');
232		553
233	if (enc->flags & F_INDENT)	554	if (enc->json.flags & F_INDENT)
234	encode_nl (enc);	555	encode_nl (enc);
235	else if (enc->flags & F_SPACE_AFTER)	556	else if (enc->json.flags & F_SPACE_AFTER)
236	encode_space (enc);	557	encode_space (enc);
237	}	558	}
238		559
239	static void encode_sv (enc_t *enc, SV *sv);	560	static void encode_sv (enc_t *enc, SV *sv);
240		561
241	static void	562	static void
242	encode_av (enc_t *enc, AV *av)	563	encode_av (enc_t *enc, AV *av)
243	{	564	{
244	int i, len = av_len (av);	565	int i, len = av_len (av);
245		566
246	encode_ch (enc, '['); encode_nl (enc);	567	if (enc->indent >= enc->json.max_depth)
247	++enc->indent;	568	croak (ERR_NESTING_EXCEEDED);
248		569
		570	encode_ch (enc, '[');
		571
		572	if (len >= 0)
		573	{
		574	encode_nl (enc); ++enc->indent;
		575
249	for (i = 0; i <= len; ++i)	576	for (i = 0; i <= len; ++i)
250	{	577	{
		578	SV **svp = av_fetch (av, i, 0);
		579
251	encode_indent (enc);	580	encode_indent (enc);
252	encode_sv (enc, *av_fetch (av, i, 0));
253		581
		582	if (svp)
		583	encode_sv (enc, *svp);
		584	else
		585	encode_str (enc, "null", 4, 0);
		586
254	if (i < len)	587	if (i < len)
255	encode_comma (enc);	588	encode_comma (enc);
256	}	589	}
257		590
		591	encode_nl (enc); --enc->indent; encode_indent (enc);
		592	}
		593
258	encode_nl (enc);	594	encode_ch (enc, ']');
259
260	--enc->indent;
261	encode_indent (enc); encode_ch (enc, ']');
262	}	595	}
263		596
264	static void	597	static void
265	encode_he (enc_t *enc, HE *he)	598	encode_hk (enc_t *enc, HE *he)
266	{	599	{
267	encode_ch (enc, '"');	600	encode_ch (enc, '"');
268		601
269	if (HeKLEN (he) == HEf_SVKEY)	602	if (HeKLEN (he) == HEf_SVKEY)
270	{	603	{
271	SV *sv = HeSVKEY (he);	604	SV *sv = HeSVKEY (he);
272	STRLEN len;	605	STRLEN len;
273	char *str;	606	char *str;
274		607
275	SvGETMAGIC (sv);	608	SvGETMAGIC (sv);
276	str = SvPV (sv, len);	609	str = SvPV (sv, len);
277		610
278	encode_str (enc, str, len, SvUTF8 (sv));	611	encode_str (enc, str, len, SvUTF8 (sv));
279	}	612	}
280	else	613	else
281	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	614	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
282		615
283	encode_ch (enc, '"');	616	encode_ch (enc, '"');
284		617
285	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	618	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
286	encode_ch (enc, ':');	619	encode_ch (enc, ':');
287	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	620	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
288	encode_sv (enc, HeVAL (he));
289	}	621	}
290		622
291	// compare hash entries, used when all keys are bytestrings	623	// compare hash entries, used when all keys are bytestrings
292	static int	624	static int
293	he_cmp_fast (const void *a_, const void *b_)	625	he_cmp_fast (const void *a_, const void *b_)
…		…
298	HE *b = *(HE **)b_;	630	HE *b = *(HE **)b_;
299		631
300	STRLEN la = HeKLEN (a);	632	STRLEN la = HeKLEN (a);
301	STRLEN lb = HeKLEN (b);	633	STRLEN lb = HeKLEN (b);
302		634
303	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	635	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
304	cmp = la - lb;	636	cmp = lb - la;
305		637
306	return cmp;	638	return cmp;
307	}	639	}
308		640
309	// compare hash entries, used when some keys are sv's or utf-x	641	// compare hash entries, used when some keys are sv's or utf-x
310	static int	642	static int
311	he_cmp_slow (const void *a, const void *b)	643	he_cmp_slow (const void *a, const void *b)
312	{	644	{
313	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	645	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
314	}	646	}
315		647
316	static void	648	static void
317	encode_hv (enc_t *enc, HV *hv)	649	encode_hv (enc_t *enc, HV *hv)
318	{	650	{
319	int count, i;	651	HE *he;
320		652
321	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	653	if (enc->indent >= enc->json.max_depth)
		654	croak (ERR_NESTING_EXCEEDED);
322		655
323	if ((count = hv_iterinit (hv)))	656	encode_ch (enc, '{');
324	{	657
325	// for canonical output we have to sort by keys first	658	// for canonical output we have to sort by keys first
326	// actually, this is mostly due to the stupid so-called	659	// actually, this is mostly due to the stupid so-called
327	// security workaround added somewhere in 5.8.x.	660	// security workaround added somewhere in 5.8.x
328	// that randomises hash orderings	661	// that randomises hash orderings
329	if (enc->flags & F_CANONICAL)	662	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		663	{
		664	int count = hv_iterinit (hv);
		665
		666	if (SvMAGICAL (hv))
330	{	667	{
331	HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode	668	// need to count by iterating. could improve by dynamically building the vector below
		669	// but I don't care for the speed of this special case.
		670	// note also that we will run into undefined behaviour when the two iterations
		671	// do not result in the same count, something I might care for in some later release.
		672
		673	count = 0;
		674	while (hv_iternext (hv))
		675	++count;
		676
		677	hv_iterinit (hv);
		678	}
		679
		680	if (count)
		681	{
332	int fast = 1;	682	int i, fast = 1;
		683	HE *hes_stack [STACK_HES];
		684	HE **hes = hes_stack;
		685
		686	// allocate larger arrays on the heap
		687	if (count > STACK_HES)
		688	{
		689	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		690	hes = (HE **)SvPVX (sv);
		691	}
333		692
334	i = 0;	693	i = 0;
335	while ((he = hv_iternext (hv)))	694	while ((he = hv_iternext (hv)))
336	{	695	{
337	hes [i++] = he;	696	hes [i++] = he;
…		…
359		718
360	FREETMPS;	719	FREETMPS;
361	LEAVE;	720	LEAVE;
362	}	721	}
363		722
364	for (i = 0; i < count; ++i)	723	encode_nl (enc); ++enc->indent;
		724
		725	while (count--)
365	{	726	{
366	encode_indent (enc);	727	encode_indent (enc);
		728	he = hes [count];
367	encode_he (enc, hes [i]);	729	encode_hk (enc, he);
		730	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
368		731
369	if (i < count - 1)	732	if (count)
370	encode_comma (enc);	733	encode_comma (enc);
371	}	734	}
372		735
373	encode_nl (enc);	736	encode_nl (enc); --enc->indent; encode_indent (enc);
374	}	737	}
		738	}
		739	else
		740	{
		741	if (hv_iterinit (hv) || SvMAGICAL (hv))
		742	if ((he = hv_iternext (hv)))
		743	{
		744	encode_nl (enc); ++enc->indent;
		745
		746	for (;;)
		747	{
		748	encode_indent (enc);
		749	encode_hk (enc, he);
		750	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		751
		752	if (!(he = hv_iternext (hv)))
		753	break;
		754
		755	encode_comma (enc);
		756	}
		757
		758	encode_nl (enc); --enc->indent; encode_indent (enc);
		759	}
		760	}
		761
		762	encode_ch (enc, '}');
		763	}
		764
		765	// encode objects, arrays and special \0=false and \1=true values.
		766	static void
		767	encode_rv (enc_t *enc, SV *sv)
		768	{
		769	svtype svt;
		770	GV *method;
		771
		772	SvGETMAGIC (sv);
		773	svt = SvTYPE (sv);
		774
		775	if (expect_false (SvOBJECT (sv)))
		776	{
		777	HV *stash = SvSTASH (sv);
		778
		779	if (stash == bool_stash)
		780	{
		781	if (SvIV (sv))
		782	encode_str (enc, "true", 4, 0);
		783	else
		784	encode_str (enc, "false", 5, 0);
		785	}
		786	else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
		787	{
		788	int count;
		789	dSP;
		790
		791	ENTER; SAVETMPS;
		792	SAVESTACK_POS ();
		793	PUSHMARK (SP);
		794	EXTEND (SP, 2);
		795	// we re-bless the reference to get overload and other niceties right
		796	PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		797	PUSHs (sv_json);
		798
		799	PUTBACK;
		800	count = call_sv ((SV *)GvCV (method), G_ARRAY);
		801	SPAGAIN;
		802
		803	// catch this surprisingly common error
		804	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		805	croak ("%s::FREEZE method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		806
		807	encode_ch (enc, '(');
		808	encode_ch (enc, '"');
		809	encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
		810	encode_ch (enc, '"');
		811	encode_ch (enc, ')');
		812	encode_ch (enc, '[');
		813
		814	while (count)
		815	{
		816	encode_sv (enc, SP[1 - count--]);
		817
		818	if (count)
		819	encode_ch (enc, ',');
		820	}
		821
		822	encode_ch (enc, ']');
		823
		824	FREETMPS; LEAVE;
		825	}
		826	else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
		827	{
		828	dSP;
		829
		830	ENTER; SAVETMPS;
		831	PUSHMARK (SP);
		832	// we re-bless the reference to get overload and other niceties right
		833	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		834
		835	// calling with G_SCALAR ensures that we always get a 1 return value
		836	PUTBACK;
		837	call_sv ((SV *)GvCV (method), G_SCALAR);
		838	SPAGAIN;
		839
		840	// catch this surprisingly common error
		841	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		842	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		843
		844	sv = POPs;
		845	PUTBACK;
		846
		847	encode_sv (enc, sv);
		848
		849	FREETMPS; LEAVE;
		850	}
		851	else if (enc->json.flags & F_ALLOW_BLESSED)
		852	encode_str (enc, "null", 4, 0);
375	else	853	else
376	{	854	croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)",
377	SV *sv;	855	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
378	HE *he = hv_iternext (hv);	856	}
379		857	else if (svt == SVt_PVHV)
380	for (;;)	858	encode_hv (enc, (HV *)sv);
381	{	859	else if (svt == SVt_PVAV)
382	encode_indent (enc);	860	encode_av (enc, (AV *)sv);
383	encode_he (enc, he);	861	else if (svt < SVt_PVAV)
384
385	if (!(he = hv_iternext (hv)))
386	break;
387
388	encode_comma (enc);
389	}
390
391	encode_nl (enc);
392	}
393	}	862	{
		863	int bool_type = ref_bool_type (sv);
394		864
395	--enc->indent; encode_indent (enc); encode_ch (enc, '}');	865	if (bool_type == 1)
		866	encode_str (enc, "true", 4, 0);
		867	else if (bool_type == 0)
		868	encode_str (enc, "false", 5, 0);
		869	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		870	encode_str (enc, "null", 4, 0);
		871	else
		872	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		873	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		874	}
		875	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		876	encode_str (enc, "null", 4, 0);
		877	else
		878	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		879	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
396	}	880	}
397		881
398	static void	882	static void
399	encode_sv (enc_t *enc, SV *sv)	883	encode_sv (enc_t *enc, SV *sv)
400	{	884	{
…		…
408	encode_str (enc, str, len, SvUTF8 (sv));	892	encode_str (enc, str, len, SvUTF8 (sv));
409	encode_ch (enc, '"');	893	encode_ch (enc, '"');
410	}	894	}
411	else if (SvNOKp (sv))	895	else if (SvNOKp (sv))
412	{	896	{
		897	// trust that perl will do the right thing w.r.t. JSON syntax.
413	need (enc, NV_DIG + 32);	898	need (enc, NV_DIG + 32);
414	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	899	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
415	enc->cur += strlen (enc->cur);	900	enc->cur += strlen (enc->cur);
416	}	901	}
417	else if (SvIOKp (sv))	902	else if (SvIOKp (sv))
418	{	903	{
		904	// we assume we can always read an IV as a UV and vice versa
		905	// we assume two's complement
		906	// we assume no aliasing issues in the union
		907	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		908	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		909	{
		910	// optimise the "small number case"
		911	// code will likely be branchless and use only a single multiplication
		912	// works for numbers up to 59074
		913	I32 i = SvIVX (sv);
		914	U32 u;
		915	char digit, nz = 0;
		916
419	need (enc, 64);	917	need (enc, 6);
		918
		919	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		920	u = i < 0 ? -i : i;
		921
		922	// convert to 4.28 fixed-point representation
		923	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		924
		925	// now output digit by digit, each time masking out the integer part
		926	// and multiplying by 5 while moving the decimal point one to the right,
		927	// resulting in a net multiplication by 10.
		928	// we always write the digit to memory but conditionally increment
		929	// the pointer, to enable the use of conditional move instructions.
		930	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		931	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		932	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		933	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		934	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		935	}
		936	else
		937	{
		938	// large integer, use the (rather slow) snprintf way.
		939	need (enc, IVUV_MAXCHARS);
420	enc->cur +=	940	enc->cur +=
421	SvIsUV(sv)	941	SvIsUV(sv)
422	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	942	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
423	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	943	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		944	}
424	}	945	}
425	else if (SvROK (sv))	946	else if (SvROK (sv))
426	{	947	encode_rv (enc, SvRV (sv));
427	SV *rv = SvRV (sv);	948	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
428
429	if (enc->indent >= enc->max_depth)
430	croak ("data structure too deep (hit recursion limit)");
431
432	switch (SvTYPE (rv))
433	{
434	case SVt_PVAV: encode_av (enc, (AV *)rv); break;
435	case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
436
437	default:
438	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
439	SvPV_nolen (sv));
440	}
441	}
442	else if (!SvOK (sv))
443	encode_str (enc, "null", 4, 0);	949	encode_str (enc, "null", 4, 0);
444	else	950	else
445	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	951	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
446	SvPV_nolen (sv), SvFLAGS (sv));	952	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
447	}	953	}
448		954
449	static SV *	955	static SV *
450	encode_json (SV *scalar, UV flags)	956	encode_json (SV *scalar, JSON *json)
451	{	957	{
		958	enc_t enc;
		959
452	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	960	if (!(json->flags & F_ALLOW_NONREF) && json_nonref (scalar))
453	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	961	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
454		962
455	enc_t enc;	963	enc.json = *json;
456	enc.flags = flags;
457	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	964	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
458	enc.cur = SvPVX (enc.sv);	965	enc.cur = SvPVX (enc.sv);
459	enc.end = SvEND (enc.sv);	966	enc.end = SvEND (enc.sv);
460	enc.indent = 0;	967	enc.indent = 0;
461	enc.max_depth = 0x7fffffffUL;	968	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		969	: enc.json.flags & F_LATIN1 ? 0x000100UL
		970	: 0x110000UL;
462		971
463	SvPOK_only (enc.sv);	972	SvPOK_only (enc.sv);
464	encode_sv (&enc, scalar);	973	encode_sv (&enc, scalar);
		974	encode_nl (&enc);
465		975
		976	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		977	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		978
466	if (!(flags & (F_ASCII | F_UTF8)))	979	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
467	SvUTF8_on (enc.sv);	980	SvUTF8_on (enc.sv);
468		981
469	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
470
471	if (enc.flags & F_SHRINK)	982	if (enc.json.flags & F_SHRINK)
472	shrink (enc.sv);	983	shrink (enc.sv);
473		984
474	return enc.sv;	985	return enc.sv;
475	}	986	}
476		987
…		…
481	typedef struct	992	typedef struct
482	{	993	{
483	char *cur; // current parser pointer	994	char *cur; // current parser pointer
484	char *end; // end of input string	995	char *end; // end of input string
485	const char *err; // parse error, if != 0	996	const char *err; // parse error, if != 0
486	UV flags; // F_*	997	JSON json;
		998	U32 depth; // recursion depth
		999	U32 maxdepth; // recursion depth limit
487	} dec_t;	1000	} dec_t;
488		1001
489	static void	1002	INLINE void
		1003	decode_comment (dec_t *dec)
		1004	{
		1005	// only '#'-style comments allowed a.t.m.
		1006
		1007	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		1008	++dec->cur;
		1009	}
		1010
		1011	INLINE void
490	decode_ws (dec_t *dec)	1012	decode_ws (dec_t *dec)
491	{	1013	{
492	for (;;)	1014	for (;;)
493	{	1015	{
494	char ch = *dec->cur;	1016	char ch = *dec->cur;
495		1017
496	if (ch > 0x20	1018	if (ch > 0x20)
		1019	{
		1020	if (expect_false (ch == '#'))
		1021	{
		1022	if (dec->json.flags & F_RELAXED)
		1023	decode_comment (dec);
		1024	else
		1025	break;
		1026	}
		1027	else
		1028	break;
		1029	}
497	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	1030	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
498	break;	1031	break; // parse error, but let higher level handle it, gives better error messages
499		1032
500	++dec->cur;	1033	++dec->cur;
501	}	1034	}
502	}	1035	}
503		1036
504	#define ERR(reason) SB dec->err = reason; goto fail; SE	1037	#define ERR(reason) SB dec->err = reason; goto fail; SE
		1038
505	#define EXPECT_CH(ch) SB \	1039	#define EXPECT_CH(ch) SB \
506	if (*dec->cur != ch) \	1040	if (*dec->cur != ch) \
507	ERR (# ch " expected"); \	1041	ERR (# ch " expected"); \
508	++dec->cur; \	1042	++dec->cur; \
509	SE	1043	SE
510		1044
		1045	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		1046	#define DEC_DEC_DEPTH --dec->depth
		1047
511	static SV *decode_sv (dec_t *dec);	1048	static SV *decode_sv (dec_t *dec);
512		1049
513	static signed char decode_hexdigit[256];	1050	static signed char decode_hexdigit[256];
514		1051
515	static UV	1052	static UV
516	decode_4hex (dec_t *dec)	1053	decode_4hex (dec_t *dec)
517	{	1054	{
518	signed char d1, d2, d3, d4;	1055	signed char d1, d2, d3, d4;
519	unsigned char *cur = (unsigned char *)dec->cur;	1056	unsigned char *cur = (unsigned char *)dec->cur;
520		1057
521	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	1058	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
522	d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected");	1059	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
523	d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected");	1060	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
524	d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected");	1061	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
525		1062
526	dec->cur += 4;	1063	dec->cur += 4;
527		1064
528	return ((UV)d1) << 12	1065	return ((UV)d1) << 12
529	| ((UV)d2) << 8	1066	| ((UV)d2) << 8
…		…
537	static SV *	1074	static SV *
538	decode_str (dec_t *dec)	1075	decode_str (dec_t *dec)
539	{	1076	{
540	SV *sv = 0;	1077	SV *sv = 0;
541	int utf8 = 0;	1078	int utf8 = 0;
		1079	char *dec_cur = dec->cur;
542		1080
543	do	1081	do
544	{	1082	{
545	char buf [SHORT_STRING_LEN + UTF8_MAX_LEN];	1083	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
546	char *cur = buf;	1084	char *cur = buf;
547		1085
548	do	1086	do
549	{	1087	{
550	unsigned char ch = *(unsigned char *)dec->cur++;	1088	unsigned char ch = *(unsigned char *)dec_cur++;
551		1089
552	if (ch == '"')	1090	if (expect_false (ch == '"'))
553	{	1091	{
554	--dec->cur;	1092	--dec_cur;
555	break;	1093	break;
556	}	1094	}
557	else if (ch == '\\')	1095	else if (expect_false (ch == '\\'))
558	{	1096	{
559	switch (*dec->cur)	1097	switch (*dec_cur)
560	{	1098	{
561	case '\\':	1099	case '\\':
562	case '/':	1100	case '/':
563	case '"': *cur++ = *dec->cur++; break;	1101	case '"': *cur++ = *dec_cur++; break;
564		1102
565	case 'b': ++dec->cur; *cur++ = '\010'; break;	1103	case 'b': ++dec_cur; *cur++ = '\010'; break;
566	case 't': ++dec->cur; *cur++ = '\011'; break;	1104	case 't': ++dec_cur; *cur++ = '\011'; break;
567	case 'n': ++dec->cur; *cur++ = '\012'; break;	1105	case 'n': ++dec_cur; *cur++ = '\012'; break;
568	case 'f': ++dec->cur; *cur++ = '\014'; break;	1106	case 'f': ++dec_cur; *cur++ = '\014'; break;
569	case 'r': ++dec->cur; *cur++ = '\015'; break;	1107	case 'r': ++dec_cur; *cur++ = '\015'; break;
570		1108
571	case 'u':	1109	case 'u':
572	{	1110	{
573	UV lo, hi;	1111	UV lo, hi;
574	++dec->cur;	1112	++dec_cur;
575		1113
		1114	dec->cur = dec_cur;
576	hi = decode_4hex (dec);	1115	hi = decode_4hex (dec);
		1116	dec_cur = dec->cur;
577	if (hi == (UV)-1)	1117	if (hi == (UV)-1)
578	goto fail;	1118	goto fail;
579		1119
580	// possibly a surrogate pair	1120	// possibly a surrogate pair
581	if (hi >= 0xd800)	1121	if (hi >= 0xd800)
582	if (hi < 0xdc00)	1122	if (hi < 0xdc00)
583	{	1123	{
584	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1124	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
585	ERR ("missing low surrogate character in surrogate pair");	1125	ERR ("missing low surrogate character in surrogate pair");
586		1126
587	dec->cur += 2;	1127	dec_cur += 2;
588		1128
		1129	dec->cur = dec_cur;
589	lo = decode_4hex (dec);	1130	lo = decode_4hex (dec);
		1131	dec_cur = dec->cur;
590	if (lo == (UV)-1)	1132	if (lo == (UV)-1)
591	goto fail;	1133	goto fail;
592		1134
593	if (lo < 0xdc00 || lo >= 0xe000)	1135	if (lo < 0xdc00 || lo >= 0xe000)
594	ERR ("surrogate pair expected");	1136	ERR ("surrogate pair expected");
…		…
600		1142
601	if (hi >= 0x80)	1143	if (hi >= 0x80)
602	{	1144	{
603	utf8 = 1;	1145	utf8 = 1;
604		1146
605	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);	1147	cur = encode_utf8 (cur, hi);
606	}	1148	}
607	else	1149	else
608	*cur++ = hi;	1150	*cur++ = hi;
609	}	1151	}
610	break;	1152	break;
611		1153
612	default:	1154	default:
613	--dec->cur;	1155	--dec_cur;
614	ERR ("illegal backslash escape sequence in string");	1156	ERR ("illegal backslash escape sequence in string");
615	}	1157	}
616	}	1158	}
617	else if (ch >= 0x20 && ch <= 0x7f)	1159	else if (expect_true (ch >= 0x20 && ch < 0x80))
618	*cur++ = ch;	1160	*cur++ = ch;
619	else if (ch >= 0x80)	1161	else if (ch >= 0x80)
620	{	1162	{
621	--dec->cur;
622
623	STRLEN clen;	1163	STRLEN clen;
624	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	1164
		1165	--dec_cur;
		1166
		1167	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
625	if (clen == (STRLEN)-1)	1168	if (clen == (STRLEN)-1)
626	ERR ("malformed UTF-8 character in JSON string");	1169	ERR ("malformed UTF-8 character in JSON string");
627		1170
628	do	1171	do
629	{
630	*cur++ = *dec->cur++;	1172	*cur++ = *dec_cur++;
631	}
632	while (--clen);	1173	while (--clen);
633		1174
634	utf8 = 1;	1175	utf8 = 1;
635	}	1176	}
636	else if (!ch)	1177	else if (ch == '\t' && dec->json.flags & F_RELAXED)
637	ERR ("unexpected end of string while parsing json string");	1178	*cur++ = ch;
638	else	1179	else
		1180	{
		1181	--dec_cur;
		1182
		1183	if (!ch)
		1184	ERR ("unexpected end of string while parsing JSON string");
		1185	else
639	ERR ("invalid character encountered");	1186	ERR ("invalid character encountered while parsing JSON string");
640		1187	}
641	}	1188	}
642	while (cur < buf + SHORT_STRING_LEN);	1189	while (cur < buf + SHORT_STRING_LEN);
643		1190
		1191	{
644	STRLEN len = cur - buf;	1192	STRLEN len = cur - buf;
645		1193
646	if (sv)	1194	if (sv)
647	{	1195	{
648	SvGROW (sv, SvCUR (sv) + len + 1);	1196	STRLEN cur = SvCUR (sv);
		1197
		1198	if (SvLEN (sv) - cur <= len)
		1199	json_sv_grow (sv, cur, len);
		1200
649	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	1201	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
650	SvCUR_set (sv, SvCUR (sv) + len);	1202	SvCUR_set (sv, SvCUR (sv) + len);
651	}	1203	}
652	else	1204	else
653	sv = newSVpvn (buf, len);	1205	sv = newSVpvn (buf, len);
654	}	1206	}
		1207	}
655	while (*dec->cur != '"');	1208	while (*dec_cur != '"');
656		1209
657	++dec->cur;	1210	++dec_cur;
658		1211
659	if (sv)	1212	if (sv)
660	{	1213	{
661	SvPOK_only (sv);	1214	SvPOK_only (sv);
662	*SvEND (sv) = 0;	1215	*SvEND (sv) = 0;
…		…
665	SvUTF8_on (sv);	1218	SvUTF8_on (sv);
666	}	1219	}
667	else	1220	else
668	sv = newSVpvn ("", 0);	1221	sv = newSVpvn ("", 0);
669		1222
		1223	dec->cur = dec_cur;
670	return sv;	1224	return sv;
671		1225
672	fail:	1226	fail:
		1227	dec->cur = dec_cur;
673	return 0;	1228	return 0;
674	}	1229	}
675		1230
676	static SV *	1231	static SV *
677	decode_num (dec_t *dec)	1232	decode_num (dec_t *dec)
…		…
735	is_nv = 1;	1290	is_nv = 1;
736	}	1291	}
737		1292
738	if (!is_nv)	1293	if (!is_nv)
739	{	1294	{
740	UV uv;	1295	int len = dec->cur - start;
741	int numtype = grok_number (start, dec->cur - start, &uv);	1296
742	if (numtype & IS_NUMBER_IN_UV)	1297	// special case the rather common 1..5-digit-int case
743	if (numtype & IS_NUMBER_NEG)	1298	if (*start == '-')
		1299	switch (len)
744	{	1300	{
745	if (uv < (UV)IV_MIN)	1301	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
746	return newSViv (-(IV)uv);	1302	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1303	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1304	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1305	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
747	}	1306	}
		1307	else
		1308	switch (len)
		1309	{
		1310	case 1: return newSViv ( start [0] - '0' * 1);
		1311	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1312	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1313	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1314	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1315	}
		1316
		1317	{
		1318	UV uv;
		1319	int numtype = grok_number (start, len, &uv);
		1320	if (numtype & IS_NUMBER_IN_UV)
		1321	if (numtype & IS_NUMBER_NEG)
		1322	{
		1323	if (uv < (UV)IV_MIN)
		1324	return newSViv (-(IV)uv);
		1325	}
748	else	1326	else
749	return newSVuv (uv);	1327	return newSVuv (uv);
750	}	1328	}
751		1329
		1330	len -= *start == '-' ? 1 : 0;
		1331
		1332	// does not fit into IV or UV, try NV
		1333	if (len <= NV_DIG)
		1334	// fits into NV without loss of precision
		1335	return newSVnv (json_atof (start));
		1336
		1337	// everything else fails, convert it to a string
		1338	return newSVpvn (start, dec->cur - start);
		1339	}
		1340
		1341	// loss of precision here
752	return newSVnv (Atof (start));	1342	return newSVnv (json_atof (start));
753		1343
754	fail:	1344	fail:
755	return 0;	1345	return 0;
756	}	1346	}
757		1347
758	static SV *	1348	static SV *
759	decode_av (dec_t *dec)	1349	decode_av (dec_t *dec)
760	{	1350	{
761	AV *av = newAV ();	1351	AV *av = newAV ();
762		1352
		1353	DEC_INC_DEPTH;
763	decode_ws (dec);	1354	decode_ws (dec);
		1355
764	if (*dec->cur == ']')	1356	if (*dec->cur == ']')
765	++dec->cur;	1357	++dec->cur;
766	else	1358	else
767	for (;;)	1359	for (;;)
768	{	1360	{
…		…
779	if (*dec->cur == ']')	1371	if (*dec->cur == ']')
780	{	1372	{
781	++dec->cur;	1373	++dec->cur;
782	break;	1374	break;
783	}	1375	}
784		1376
785	if (*dec->cur != ',')	1377	if (*dec->cur != ',')
786	ERR (", or ] expected while parsing array");	1378	ERR (", or ] expected while parsing array");
787		1379
788	++dec->cur;	1380	++dec->cur;
		1381
		1382	decode_ws (dec);
		1383
		1384	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1385	{
		1386	++dec->cur;
		1387	break;
		1388	}
789	}	1389	}
790		1390
		1391	DEC_DEC_DEPTH;
791	return newRV_noinc ((SV *)av);	1392	return newRV_noinc ((SV *)av);
792		1393
793	fail:	1394	fail:
794	SvREFCNT_dec (av);	1395	SvREFCNT_dec (av);
		1396	DEC_DEC_DEPTH;
795	return 0;	1397	return 0;
796	}	1398	}
797		1399
798	static SV *	1400	static SV *
799	decode_hv (dec_t *dec)	1401	decode_hv (dec_t *dec)
800	{	1402	{
		1403	SV *sv;
801	HV *hv = newHV ();	1404	HV *hv = newHV ();
802		1405
		1406	DEC_INC_DEPTH;
803	decode_ws (dec);	1407	decode_ws (dec);
		1408
804	if (*dec->cur == '}')	1409	if (*dec->cur == '}')
805	++dec->cur;	1410	++dec->cur;
806	else	1411	else
807	for (;;)	1412	for (;;)
808	{	1413	{
		1414	EXPECT_CH ('"');
		1415
		1416	// heuristic: assume that
		1417	// a) decode_str + hv_store_ent are abysmally slow.
		1418	// b) most hash keys are short, simple ascii text.
		1419	// => try to "fast-match" such strings to avoid
		1420	// the overhead of decode_str + hv_store_ent.
		1421	{
809	SV *key, *value;	1422	SV *value;
		1423	char *p = dec->cur;
		1424	char *e = p + 24; // only try up to 24 bytes
810		1425
811	decode_ws (dec); EXPECT_CH ('"');	1426	for (;;)
812
813	key = decode_str (dec);
814	if (!key)
815	goto fail;
816
817	decode_ws (dec); EXPECT_CH (':');
818
819	value = decode_sv (dec);
820	if (!value)
821	{	1427	{
		1428	// the >= 0x80 is false on most architectures
		1429	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1430	{
		1431	// slow path, back up and use decode_str
		1432	SV *key = decode_str (dec);
		1433	if (!key)
		1434	goto fail;
		1435
		1436	decode_ws (dec); EXPECT_CH (':');
		1437
		1438	decode_ws (dec);
		1439	value = decode_sv (dec);
		1440	if (!value)
		1441	{
		1442	SvREFCNT_dec (key);
		1443	goto fail;
		1444	}
		1445
		1446	hv_store_ent (hv, key, value, 0);
822	SvREFCNT_dec (key);	1447	SvREFCNT_dec (key);
		1448
		1449	break;
		1450	}
		1451	else if (*p == '"')
		1452	{
		1453	// fast path, got a simple key
		1454	char *key = dec->cur;
		1455	int len = p - key;
		1456	dec->cur = p + 1;
		1457
		1458	decode_ws (dec); EXPECT_CH (':');
		1459
		1460	decode_ws (dec);
		1461	value = decode_sv (dec);
		1462	if (!value)
823	goto fail;	1463	goto fail;
		1464
		1465	hv_store (hv, key, len, value, 0);
		1466
		1467	break;
		1468	}
		1469
		1470	++p;
824	}	1471	}
825		1472	}
826	//TODO: optimise
827	hv_store_ent (hv, key, value, 0);
828		1473
829	decode_ws (dec);	1474	decode_ws (dec);
830		1475
831	if (*dec->cur == '}')	1476	if (*dec->cur == '}')
832	{	1477	{
…		…
836		1481
837	if (*dec->cur != ',')	1482	if (*dec->cur != ',')
838	ERR (", or } expected while parsing object/hash");	1483	ERR (", or } expected while parsing object/hash");
839		1484
840	++dec->cur;	1485	++dec->cur;
		1486
		1487	decode_ws (dec);
		1488
		1489	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1490	{
		1491	++dec->cur;
		1492	break;
		1493	}
841	}	1494	}
842		1495
		1496	DEC_DEC_DEPTH;
843	return newRV_noinc ((SV *)hv);	1497	sv = newRV_noinc ((SV *)hv);
		1498
		1499	// check filter callbacks
		1500	if (dec->json.flags & F_HOOK)
		1501	{
		1502	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1503	{
		1504	HE *cb, *he;
		1505
		1506	hv_iterinit (hv);
		1507	he = hv_iternext (hv);
		1508	hv_iterinit (hv);
		1509
		1510	// the next line creates a mortal sv each time it's called.
		1511	// might want to optimise this for common cases.
		1512	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1513
		1514	if (cb)
		1515	{
		1516	dSP;
		1517	int count;
		1518
		1519	ENTER; SAVETMPS;
		1520	SAVESTACK_POS ();
		1521	PUSHMARK (SP);
		1522	XPUSHs (HeVAL (he));
		1523	sv_2mortal (sv);
		1524
		1525	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1526
		1527	if (count == 1)
		1528	{
		1529	sv = newSVsv (POPs);
		1530	FREETMPS; LEAVE;
		1531	return sv;
		1532	}
		1533
		1534	SvREFCNT_inc (sv);
		1535	FREETMPS; LEAVE;
		1536	}
		1537	}
		1538
		1539	if (dec->json.cb_object)
		1540	{
		1541	dSP;
		1542	int count;
		1543
		1544	ENTER; SAVETMPS;
		1545	SAVESTACK_POS ();
		1546	PUSHMARK (SP);
		1547	XPUSHs (sv_2mortal (sv));
		1548
		1549	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1550
		1551	if (count == 1)
		1552	{
		1553	sv = newSVsv (POPs);
		1554	FREETMPS; LEAVE;
		1555	return sv;
		1556	}
		1557
		1558	SvREFCNT_inc (sv);
		1559	FREETMPS; LEAVE;
		1560	}
		1561	}
		1562
		1563	return sv;
844		1564
845	fail:	1565	fail:
846	SvREFCNT_dec (hv);	1566	SvREFCNT_dec (hv);
		1567	DEC_DEC_DEPTH;
		1568	return 0;
		1569	}
		1570
		1571	static SV *
		1572	decode_tag (dec_t *dec)
		1573	{
		1574	SV *tag = 0;
		1575	SV *val = 0;
		1576
		1577	if (!(dec->json.flags & F_ALLOW_TAGS))
		1578	ERR ("malformed JSON string, neither array, object, number, string or atom");
		1579
		1580	++dec->cur;
		1581
		1582	decode_ws (dec);
		1583
		1584	tag = decode_sv (dec);
		1585	if (!tag)
		1586	goto fail;
		1587
		1588	if (!SvPOK (tag))
		1589	ERR ("malformed JSON string, (tag) must be a string");
		1590
		1591	decode_ws (dec);
		1592
		1593	if (*dec->cur != ')')
		1594	ERR (") expected after tag");
		1595
		1596	++dec->cur;
		1597
		1598	decode_ws (dec);
		1599
		1600	val = decode_sv (dec);
		1601	if (!val)
		1602	goto fail;
		1603
		1604	if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
		1605	ERR ("malformed JSON string, tag value must be an array");
		1606
		1607	{
		1608	AV *av = (AV *)SvRV (val);
		1609	int i, len = av_len (av) + 1;
		1610	HV *stash = gv_stashsv (tag, 0);
		1611	SV *sv;
		1612
		1613	if (!stash)
		1614	ERR ("cannot decode perl-object (package does not exist)");
		1615
		1616	GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
		1617
		1618	if (!method)
		1619	ERR ("cannot decode perl-object (package does not have a THAW method)");
		1620
		1621	dSP;
		1622
		1623	ENTER; SAVETMPS;
		1624	PUSHMARK (SP);
		1625	EXTEND (SP, len + 2);
		1626	// we re-bless the reference to get overload and other niceties right
		1627	PUSHs (tag);
		1628	PUSHs (sv_json);
		1629
		1630	for (i = 0; i < len; ++i)
		1631	PUSHs (*av_fetch (av, i, 1));
		1632
		1633	PUTBACK;
		1634	call_sv ((SV *)GvCV (method), G_SCALAR);
		1635	SPAGAIN;
		1636
		1637	SvREFCNT_dec (tag);
		1638	SvREFCNT_dec (val);
		1639	sv = SvREFCNT_inc (POPs);
		1640
		1641	PUTBACK;
		1642
		1643	FREETMPS; LEAVE;
		1644
		1645	return sv;
		1646	}
		1647
		1648	fail:
		1649	SvREFCNT_dec (tag);
		1650	SvREFCNT_dec (val);
847	return 0;	1651	return 0;
848	}	1652	}
849		1653
850	static SV *	1654	static SV *
851	decode_sv (dec_t *dec)	1655	decode_sv (dec_t *dec)
852	{	1656	{
853	decode_ws (dec);	1657	// the beauty of JSON: you need exactly one character lookahead
		1658	// to parse everything.
854	switch (*dec->cur)	1659	switch (*dec->cur)
855	{	1660	{
856	case '"': ++dec->cur; return decode_str (dec);	1661	case '"': ++dec->cur; return decode_str (dec);
857	case '[': ++dec->cur; return decode_av (dec);	1662	case '[': ++dec->cur; return decode_av (dec);
858	case '{': ++dec->cur; return decode_hv (dec);	1663	case '{': ++dec->cur; return decode_hv (dec);
		1664	case '(': return decode_tag (dec);
859		1665
860	case '-':	1666	case '-':
861	case '0': case '1': case '2': case '3': case '4':	1667	case '0': case '1': case '2': case '3': case '4':
862	case '5': case '6': case '7': case '8': case '9':	1668	case '5': case '6': case '7': case '8': case '9':
863	return decode_num (dec);	1669	return decode_num (dec);
864		1670
865	case 't':	1671	case 't':
866	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1672	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
867	{	1673	{
868	dec->cur += 4;	1674	dec->cur += 4;
		1675	#if JSON_SLOW
		1676	bool_true = get_bool ("Types::Serialiser::true");
		1677	#endif
869	return newSViv (1);	1678	return newSVsv (bool_true);
870	}	1679	}
871	else	1680	else
872	ERR ("'true' expected");	1681	ERR ("'true' expected");
873		1682
874	break;	1683	break;
875		1684
876	case 'f':	1685	case 'f':
877	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1686	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
878	{	1687	{
879	dec->cur += 5;	1688	dec->cur += 5;
		1689	#if JSON_SLOW
		1690	bool_false = get_bool ("Types::Serialiser::false");
		1691	#endif
880	return newSViv (0);	1692	return newSVsv (bool_false);
881	}	1693	}
882	else	1694	else
883	ERR ("'false' expected");	1695	ERR ("'false' expected");
884		1696
885	break;	1697	break;
…		…
894	ERR ("'null' expected");	1706	ERR ("'null' expected");
895		1707
896	break;	1708	break;
897		1709
898	default:	1710	default:
899	ERR ("malformed json string, neither array, object, number, string or atom");	1711	ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
900	break;	1712	break;
901	}	1713	}
902		1714
903	fail:	1715	fail:
904	return 0;	1716	return 0;
905	}	1717	}
906		1718
907	static SV *	1719	static SV *
908	decode_json (SV *string, UV flags)	1720	decode_json (SV *string, JSON *json, STRLEN *offset_return)
909	{	1721	{
		1722	dec_t dec;
910	SV *sv;	1723	SV *sv;
911		1724
912	if (flags & F_UTF8)	1725	/* work around bugs in 5.10 where manipulating magic values
		1726	* makes perl ignore the magic in subsequent accesses.
		1727	* also make a copy of non-PV values, to get them into a clean
		1728	* state (SvPV should do that, but it's buggy, see below).
		1729	*
		1730	* SvIsCOW_shared_hash works around a bug in perl (possibly 5.16),
		1731	* as reported by Reini Urban.
		1732	*/
		1733	/*SvGETMAGIC (string);*/
		1734	if (SvMAGICAL (string) || !SvPOK (string) || SvIsCOW_shared_hash (string))
		1735	string = sv_2mortal (newSVsv (string));
		1736
		1737	SvUPGRADE (string, SVt_PV);
		1738
		1739	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1740	* assertion with -DDEBUGGING, although SvCUR is documented to
		1741	* return the xpv_cur field which certainly exists after upgrading.
		1742	* according to nicholas clark, calling SvPOK fixes this.
		1743	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1744	* and hope for the best.
		1745	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1746	* assertion business is seriously broken, try yet another workaround
		1747	* for the broken -DDEBUGGING.
		1748	*/
		1749	{
		1750	#ifdef DEBUGGING
		1751	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1752	#else
		1753	STRLEN offset = SvCUR (string);
		1754	#endif
		1755
		1756	if (offset > json->max_size && json->max_size)
		1757	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1758	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1759	}
		1760
		1761	if (DECODE_WANTS_OCTETS (json))
913	sv_utf8_downgrade (string, 0);	1762	sv_utf8_downgrade (string, 0);
914	else	1763	else
915	sv_utf8_upgrade (string);	1764	sv_utf8_upgrade (string);
916		1765
917	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1766	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
918		1767
919	dec_t dec;	1768	dec.json = *json;
920	dec.flags = flags;
921	dec.cur = SvPVX (string);	1769	dec.cur = SvPVX (string);
922	dec.end = SvEND (string);	1770	dec.end = SvEND (string);
923	dec.err = 0;	1771	dec.err = 0;
		1772	dec.depth = 0;
924		1773
		1774	if (dec.json.cb_object || dec.json.cb_sk_object)
		1775	dec.json.flags |= F_HOOK;
		1776
		1777	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1778
		1779	decode_ws (&dec);
925	sv = decode_sv (&dec);	1780	sv = decode_sv (&dec);
926		1781
		1782	if (offset_return)
		1783	*offset_return = dec.cur - SvPVX (string);
		1784	else if (sv)
		1785	{
		1786	// check for trailing garbage
		1787	decode_ws (&dec);
		1788
		1789	if (*dec.cur)
		1790	{
		1791	dec.err = "garbage after JSON object";
		1792	SvREFCNT_dec (sv);
		1793	sv = 0;
		1794	}
		1795	}
		1796
927	if (!sv)	1797	if (!sv)
928	{	1798	{
929	IV offset = dec.flags & F_UTF8
930	? dec.cur - SvPVX (string)
931	: utf8_distance (dec.cur, SvPVX (string));
932	SV *uni = sv_newmortal ();	1799	SV *uni = sv_newmortal ();
933		1800
934	// horrible hack to silence warning inside pv_uni_display	1801	// horrible hack to silence warning inside pv_uni_display
935	COP cop = *PL_curcop;	1802	COP cop = *PL_curcop;
936	cop.cop_warnings = pWARN_NONE;	1803	cop.cop_warnings = pWARN_NONE;
…		…
938	SAVEVPTR (PL_curcop);	1805	SAVEVPTR (PL_curcop);
939	PL_curcop = &cop;	1806	PL_curcop = &cop;
940	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1807	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
941	LEAVE;	1808	LEAVE;
942		1809
943	croak ("%s, at character offset %d (%s)",	1810	croak ("%s, at character offset %d (before \"%s\")",
944	dec.err,	1811	dec.err,
945	(int)offset,	1812	(int)ptr_to_index (string, dec.cur),
946	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1813	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
947	}	1814	}
948		1815
949	sv = sv_2mortal (sv);	1816	sv = sv_2mortal (sv);
950		1817
951	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1818	if (!(dec.json.flags & F_ALLOW_NONREF) && json_nonref (sv))
952	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1819	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
953		1820
954	return sv;	1821	return sv;
		1822	}
		1823
		1824	/////////////////////////////////////////////////////////////////////////////
		1825	// incremental parser
		1826
		1827	static void
		1828	incr_parse (JSON *self)
		1829	{
		1830	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1831
		1832	// the state machine here is a bit convoluted and could be simplified a lot
		1833	// but this would make it slower, so...
		1834
		1835	for (;;)
		1836	{
		1837	//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
		1838	switch (self->incr_mode)
		1839	{
		1840	// only used for initial whitespace skipping
		1841	case INCR_M_WS:
		1842	for (;;)
		1843	{
		1844	if (*p > 0x20)
		1845	{
		1846	if (*p == '#')
		1847	{
		1848	self->incr_mode = INCR_M_C0;
		1849	goto incr_m_c;
		1850	}
		1851	else
		1852	{
		1853	self->incr_mode = INCR_M_JSON;
		1854	goto incr_m_json;
		1855	}
		1856	}
		1857	else if (!*p)
		1858	goto interrupt;
		1859
		1860	++p;
		1861	}
		1862
		1863	// skip a single char inside a string (for \\-processing)
		1864	case INCR_M_BS:
		1865	if (!*p)
		1866	goto interrupt;
		1867
		1868	++p;
		1869	self->incr_mode = INCR_M_STR;
		1870	goto incr_m_str;
		1871
		1872	// inside #-style comments
		1873	case INCR_M_C0:
		1874	case INCR_M_C1:
		1875	incr_m_c:
		1876	for (;;)
		1877	{
		1878	if (*p == '\n')
		1879	{
		1880	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1881	break;
		1882	}
		1883	else if (!*p)
		1884	goto interrupt;
		1885
		1886	++p;
		1887	}
		1888
		1889	break;
		1890
		1891	// inside a string
		1892	case INCR_M_STR:
		1893	incr_m_str:
		1894	for (;;)
		1895	{
		1896	if (*p == '"')
		1897	{
		1898	++p;
		1899	self->incr_mode = INCR_M_JSON;
		1900
		1901	if (!self->incr_nest)
		1902	goto interrupt;
		1903
		1904	goto incr_m_json;
		1905	}
		1906	else if (*p == '\\')
		1907	{
		1908	++p; // "virtually" consumes character after \
		1909
		1910	if (!*p) // if at end of string we have to switch modes
		1911	{
		1912	self->incr_mode = INCR_M_BS;
		1913	goto interrupt;
		1914	}
		1915	}
		1916	else if (!*p)
		1917	goto interrupt;
		1918
		1919	++p;
		1920	}
		1921
		1922	// after initial ws, outside string
		1923	case INCR_M_JSON:
		1924	incr_m_json:
		1925	for (;;)
		1926	{
		1927	switch (*p++)
		1928	{
		1929	case 0:
		1930	--p;
		1931	goto interrupt;
		1932
		1933	case 0x09:
		1934	case 0x0a:
		1935	case 0x0d:
		1936	case 0x20:
		1937	if (!self->incr_nest)
		1938	{
		1939	--p; // do not eat the whitespace, let the next round do it
		1940	goto interrupt;
		1941	}
		1942	break;
		1943
		1944	case '"':
		1945	self->incr_mode = INCR_M_STR;
		1946	goto incr_m_str;
		1947
		1948	case '[':
		1949	case '{':
		1950	case '(':
		1951	if (++self->incr_nest > self->max_depth)
		1952	croak (ERR_NESTING_EXCEEDED);
		1953	break;
		1954
		1955	case ']':
		1956	case '}':
		1957	if (--self->incr_nest <= 0)
		1958	goto interrupt;
		1959	break;
		1960
		1961	case ')':
		1962	--self->incr_nest;
		1963	break;
		1964
		1965	case '#':
		1966	self->incr_mode = INCR_M_C1;
		1967	goto incr_m_c;
		1968	}
		1969	}
		1970	}
		1971
		1972	modechange:
		1973	;
		1974	}
		1975
		1976	interrupt:
		1977	self->incr_pos = p - SvPVX (self->incr_text);
		1978	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1979	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
955	}	1980	}
956		1981
957	/////////////////////////////////////////////////////////////////////////////	1982	/////////////////////////////////////////////////////////////////////////////
958	// XS interface functions	1983	// XS interface functions
959		1984
…		…
961		1986
962	BOOT:	1987	BOOT:
963	{	1988	{
964	int i;	1989	int i;
965		1990
966	memset (decode_hexdigit, 0xff, 256);
967	for (i = 10; i--; )	1991	for (i = 0; i < 256; ++i)
968	decode_hexdigit ['0' + i] = i;	1992	decode_hexdigit [i] =
		1993	i >= '0' && i <= '9' ? i - '0'
		1994	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1995	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1996	: -1;
969		1997
970	for (i = 7; i--; )
971	{
972	decode_hexdigit ['a' + i] = 10 + i;
973	decode_hexdigit ['A' + i] = 10 + i;
974	}
975
976	json_stash = gv_stashpv ("JSON::XS", 1);	1998	json_stash = gv_stashpv ("JSON::XS" , 1);
		1999	bool_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
		2000	bool_true = get_bool ("Types::Serialiser::true");
		2001	bool_false = get_bool ("Types::Serialiser::false");
		2002
		2003	sv_json = newSVpv ("JSON", 0);
		2004	SvREADONLY_on (sv_json);
		2005
		2006	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
977	}	2007	}
978		2008
979	PROTOTYPES: DISABLE	2009	PROTOTYPES: DISABLE
980		2010
981	SV *new (char *dummy)	2011	void CLONE (...)
982	CODE:	2012	CODE:
983	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	2013	json_stash = 0;
		2014	bool_stash = 0;
		2015
		2016	void new (char *klass)
		2017	PPCODE:
		2018	{
		2019	SV *pv = NEWSV (0, sizeof (JSON));
		2020	SvPOK_only (pv);
		2021	json_init ((JSON *)SvPVX (pv));
		2022	XPUSHs (sv_2mortal (sv_bless (
		2023	newRV_noinc (pv),
		2024	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		2025	)));
		2026	}
		2027
		2028	void ascii (JSON *self, int enable = 1)
		2029	ALIAS:
		2030	ascii = F_ASCII
		2031	latin1 = F_LATIN1
		2032	utf8 = F_UTF8
		2033	indent = F_INDENT
		2034	canonical = F_CANONICAL
		2035	space_before = F_SPACE_BEFORE
		2036	space_after = F_SPACE_AFTER
		2037	pretty = F_PRETTY
		2038	allow_nonref = F_ALLOW_NONREF
		2039	shrink = F_SHRINK
		2040	allow_blessed = F_ALLOW_BLESSED
		2041	convert_blessed = F_CONV_BLESSED
		2042	relaxed = F_RELAXED
		2043	allow_unknown = F_ALLOW_UNKNOWN
		2044	allow_tags = F_ALLOW_TAGS
		2045	PPCODE:
		2046	{
		2047	if (enable)
		2048	self->flags |= ix;
		2049	else
		2050	self->flags &= ~ix;
		2051
		2052	XPUSHs (ST (0));
		2053	}
		2054
		2055	void get_ascii (JSON *self)
		2056	ALIAS:
		2057	get_ascii = F_ASCII
		2058	get_latin1 = F_LATIN1
		2059	get_utf8 = F_UTF8
		2060	get_indent = F_INDENT
		2061	get_canonical = F_CANONICAL
		2062	get_space_before = F_SPACE_BEFORE
		2063	get_space_after = F_SPACE_AFTER
		2064	get_allow_nonref = F_ALLOW_NONREF
		2065	get_shrink = F_SHRINK
		2066	get_allow_blessed = F_ALLOW_BLESSED
		2067	get_convert_blessed = F_CONV_BLESSED
		2068	get_relaxed = F_RELAXED
		2069	get_allow_unknown = F_ALLOW_UNKNOWN
		2070	get_allow_tags = F_ALLOW_TAGS
		2071	PPCODE:
		2072	XPUSHs (boolSV (self->flags & ix));
		2073
		2074	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		2075	PPCODE:
		2076	self->max_depth = max_depth;
		2077	XPUSHs (ST (0));
		2078
		2079	U32 get_max_depth (JSON *self)
		2080	CODE:
		2081	RETVAL = self->max_depth;
984	OUTPUT:	2082	OUTPUT:
985	RETVAL	2083	RETVAL
986		2084
987	SV *ascii (SV *self, int enable = 1)	2085	void max_size (JSON *self, U32 max_size = 0)
988	ALIAS:	2086	PPCODE:
989	ascii = F_ASCII	2087	self->max_size = max_size;
990	utf8 = F_UTF8	2088	XPUSHs (ST (0));
991	indent = F_INDENT	2089
992	canonical = F_CANONICAL	2090	int get_max_size (JSON *self)
993	space_before = F_SPACE_BEFORE
994	space_after = F_SPACE_AFTER
995	pretty = F_PRETTY
996	allow_nonref = F_ALLOW_NONREF
997	shrink = F_SHRINK
998	CODE:	2091	CODE:
999	{	2092	RETVAL = self->max_size;
1000	UV *uv = SvJSON (self);
1001	if (enable)
1002	*uv |= ix;
1003	else
1004	*uv &= ~ix;
1005
1006	RETVAL = newSVsv (self);
1007	}
1008	OUTPUT:	2093	OUTPUT:
1009	RETVAL	2094	RETVAL
1010		2095
1011	void encode (SV *self, SV *scalar)	2096	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1012	PPCODE:	2097	PPCODE:
1013	XPUSHs (encode_json (scalar, *SvJSON (self)));	2098	{
		2099	SvREFCNT_dec (self->cb_object);
		2100	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1014		2101
1015	void decode (SV *self, SV *jsonstr)	2102	XPUSHs (ST (0));
		2103	}
		2104
		2105	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1016	PPCODE:	2106	PPCODE:
1017	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	2107	{
		2108	if (!self->cb_sk_object)
		2109	self->cb_sk_object = newHV ();
		2110
		2111	if (SvOK (cb))
		2112	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		2113	else
		2114	{
		2115	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		2116
		2117	if (!HvKEYS (self->cb_sk_object))
		2118	{
		2119	SvREFCNT_dec (self->cb_sk_object);
		2120	self->cb_sk_object = 0;
		2121	}
		2122	}
		2123
		2124	XPUSHs (ST (0));
		2125	}
		2126
		2127	void encode (JSON *self, SV *scalar)
		2128	PPCODE:
		2129	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		2130	XPUSHs (scalar);
		2131
		2132	void decode (JSON *self, SV *jsonstr)
		2133	PPCODE:
		2134	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		2135	XPUSHs (jsonstr);
		2136
		2137	void decode_prefix (JSON *self, SV *jsonstr)
		2138	PPCODE:
		2139	{
		2140	SV *sv;
		2141	STRLEN offset;
		2142	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		2143	EXTEND (SP, 2);
		2144	PUSHs (sv);
		2145	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, SvPV_nolen (jsonstr) + offset))));
		2146	}
		2147
		2148	void incr_parse (JSON *self, SV *jsonstr = 0)
		2149	PPCODE:
		2150	{
		2151	if (!self->incr_text)
		2152	self->incr_text = newSVpvn ("", 0);
		2153
		2154	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		2155	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		2156	if (DECODE_WANTS_OCTETS (self))
		2157	{
		2158	if (self->incr_pos)
		2159	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		2160	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		2161
		2162	sv_utf8_downgrade (self->incr_text, 0);
		2163	}
		2164	else
		2165	{
		2166	sv_utf8_upgrade (self->incr_text);
		2167
		2168	if (self->incr_pos)
		2169	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		2170	- (U8 *)SvPVX (self->incr_text);
		2171	}
		2172
		2173	// append data, if any
		2174	if (jsonstr)
		2175	{
		2176	/* make sure both strings have same encoding */
		2177	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		2178	if (SvUTF8 (jsonstr))
		2179	sv_utf8_downgrade (jsonstr, 0);
		2180	else
		2181	sv_utf8_upgrade (jsonstr);
		2182
		2183	/* and then just blindly append */
		2184	{
		2185	STRLEN len;
		2186	const char *str = SvPV (jsonstr, len);
		2187	STRLEN cur = SvCUR (self->incr_text);
		2188
		2189	if (SvLEN (self->incr_text) - cur <= len)
		2190	json_sv_grow (self->incr_text, cur, len);
		2191
		2192	Move (str, SvEND (self->incr_text), len, char);
		2193	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		2194	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		2195	}
		2196	}
		2197
		2198	if (GIMME_V != G_VOID)
		2199	do
		2200	{
		2201	SV *sv;
		2202	STRLEN offset;
		2203
		2204	if (!INCR_DONE (self))
		2205	{
		2206	incr_parse (self);
		2207
		2208	if (self->incr_pos > self->max_size && self->max_size)
		2209	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2210	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2211
		2212	if (!INCR_DONE (self))
		2213	{
		2214	// as an optimisation, do not accumulate white space in the incr buffer
		2215	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2216	{
		2217	self->incr_pos = 0;
		2218	SvCUR_set (self->incr_text, 0);
		2219	}
		2220
		2221	break;
		2222	}
		2223	}
		2224
		2225	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2226	XPUSHs (sv);
		2227
		2228	self->incr_pos -= offset;
		2229	self->incr_nest = 0;
		2230	self->incr_mode = 0;
		2231
		2232	sv_chop (self->incr_text, SvPVX (self->incr_text) + offset);
		2233	}
		2234	while (GIMME_V == G_ARRAY);
		2235	}
		2236
		2237	SV *incr_text (JSON *self)
		2238	ATTRS: lvalue
		2239	CODE:
		2240	{
		2241	if (self->incr_pos)
		2242	croak ("incr_text can not be called when the incremental parser already started parsing");
		2243
		2244	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		2245	}
		2246	OUTPUT:
		2247	RETVAL
		2248
		2249	void incr_skip (JSON *self)
		2250	CODE:
		2251	{
		2252	if (self->incr_pos)
		2253	{
		2254	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2255	self->incr_pos = 0;
		2256	self->incr_nest = 0;
		2257	self->incr_mode = 0;
		2258	}
		2259	}
		2260
		2261	void incr_reset (JSON *self)
		2262	CODE:
		2263	{
		2264	SvREFCNT_dec (self->incr_text);
		2265	self->incr_text = 0;
		2266	self->incr_pos = 0;
		2267	self->incr_nest = 0;
		2268	self->incr_mode = 0;
		2269	}
		2270
		2271	void DESTROY (JSON *self)
		2272	CODE:
		2273	SvREFCNT_dec (self->cb_sk_object);
		2274	SvREFCNT_dec (self->cb_object);
		2275	SvREFCNT_dec (self->incr_text);
1018		2276
1019	PROTOTYPES: ENABLE	2277	PROTOTYPES: ENABLE
1020		2278
1021	void to_json (SV *scalar)	2279	void encode_json (SV *scalar)
1022	PPCODE:	2280	PPCODE:
1023	XPUSHs (encode_json (scalar, F_UTF8));	2281	{
		2282	JSON json;
		2283	json_init (&json);
		2284	json.flags |= F_UTF8;
		2285	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2286	XPUSHs (scalar);
		2287	}
1024		2288
1025	void from_json (SV *jsonstr)	2289	void decode_json (SV *jsonstr)
1026	PPCODE:	2290	PPCODE:
1027	XPUSHs (decode_json (jsonstr, F_UTF8));	2291	{
		2292	JSON json;
		2293	json_init (&json);
		2294	json.flags |= F_UTF8;
		2295	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2296	XPUSHs (jsonstr);
		2297	}
1028		2298

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