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Comparing JSON-XS/XS.xs (file contents):
Revision 1.27 by root, Mon Apr 9 05:09:57 2007 UTC vs.
Revision 1.129 by root, Wed Nov 16 18:06:34 2016 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include <assert.h>
6	#include "string.h"	6	#include <string.h>
7	#include "stdlib.h"	7	#include <stdlib.h>
8	#include "stdio.h"	8	#include <stdio.h>
		9	#include <limits.h>
		10	#include <float.h>
9		11
10	#if defined(__BORLANDC__) || defined(_MSC_VER)	12	#if defined(__BORLANDC__) || defined(_MSC_VER)
11	# define snprintf _snprintf // C compilers have this in stdio.h	13	# define snprintf _snprintf // C compilers have this in stdio.h
12	#endif	14	#endif
13		15
		16	// some old perls do not have this, try to make it work, no
		17	// guarantees, though. if it breaks, you get to keep the pieces.
		18	#ifndef UTF8_MAXBYTES
		19	# define UTF8_MAXBYTES 13
		20	#endif
		21
		22	// compatibility with perl <5.18
		23	#ifndef HvNAMELEN_get
		24	# define HvNAMELEN_get(hv) strlen (HvNAME (hv))
		25	#endif
		26	#ifndef HvNAMELEN
		27	# define HvNAMELEN(hv) HvNAMELEN_get (hv)
		28	#endif
		29	#ifndef HvNAMEUTF8
		30	# define HvNAMEUTF8(hv) 0
		31	#endif
		32
		33	// three extra for rounding, sign, and end of string
		34	#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
		35
14	#define F_ASCII 0x00000001UL	36	#define F_ASCII 0x00000001UL
		37	#define F_LATIN1 0x00000002UL
15	#define F_UTF8 0x00000002UL	38	#define F_UTF8 0x00000004UL
16	#define F_INDENT 0x00000004UL	39	#define F_INDENT 0x00000008UL
17	#define F_CANONICAL 0x00000008UL	40	#define F_CANONICAL 0x00000010UL
18	#define F_SPACE_BEFORE 0x00000010UL	41	#define F_SPACE_BEFORE 0x00000020UL
19	#define F_SPACE_AFTER 0x00000020UL	42	#define F_SPACE_AFTER 0x00000040UL
20	#define F_ALLOW_NONREF 0x00000080UL	43	#define F_ALLOW_NONREF 0x00000100UL
21	#define F_SHRINK 0x00000100UL	44	#define F_SHRINK 0x00000200UL
		45	#define F_ALLOW_BLESSED 0x00000400UL
		46	#define F_CONV_BLESSED 0x00000800UL
22	#define F_MAXDEPTH 0xf8000000UL	47	#define F_RELAXED 0x00001000UL
23	#define S_MAXDEPTH 27	48	#define F_ALLOW_UNKNOWN 0x00002000UL
24		49	#define F_ALLOW_TAGS 0x00004000UL
25	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))	50	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
26
27	// F_SELFCONVERT? <=> to_json/toJson
28	// F_BLESSED? <=> { $__class__$ => }
29		51
30	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	52	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
31	#define F_DEFAULT (9UL << S_MAXDEPTH)
32		53
33	#define INIT_SIZE 32 // initial scalar size to be allocated	54	#define INIT_SIZE 32 // initial scalar size to be allocated
34	#define INDENT_STEP 3 // spaces per indentation level	55	#define INDENT_STEP 3 // spaces per indentation level
35		56
36	#define UTF8_MAX_LEN 11 // for perls UTF-X: max. number of octets per character
37	#define SHORT_STRING_LEN 512 // special-case strings of up to this size	57	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
		58
		59	#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
38		60
39	#define SB do {	61	#define SB do {
40	#define SE } while (0)	62	#define SE } while (0)
41		63
42	static HV *json_stash; // JSON::XS::	64	#if __GNUC__ >= 3
		65	# define expect(expr,value) __builtin_expect ((expr), (value))
		66	# define INLINE static inline
		67	#else
		68	# define expect(expr,value) (expr)
		69	# define INLINE static
		70	#endif
		71
		72	#define expect_false(expr) expect ((expr) != 0, 0)
		73	#define expect_true(expr) expect ((expr) != 0, 1)
		74
		75	#define IN_RANGE_INC(type,val,beg,end) \
		76	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		77	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		78
		79	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		80
		81	#ifdef USE_ITHREADS
		82	# define JSON_SLOW 1
		83	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		84	# define BOOL_STASH (bool_stash ? bool_stash : gv_stashpv ("Types::Serialiser::Boolean", 1))
		85	#else
		86	# define JSON_SLOW 0
		87	# define JSON_STASH json_stash
		88	# define BOOL_STASH bool_stash
		89	#endif
		90
		91	// the amount of HEs to allocate on the stack, when sorting keys
		92	#define STACK_HES 64
		93
		94	static HV *json_stash, *bool_stash; // JSON::XS::, Types::Serialiser::Boolean::
		95	static SV *bool_true, *bool_false, *sv_json;
		96
		97	enum {
		98	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		99	INCR_M_STR, // inside string
		100	INCR_M_BS, // inside backslash
		101	INCR_M_C0, // inside comment in initial whitespace sequence
		102	INCR_M_C1, // inside comment in other places
		103	INCR_M_JSON // outside anything, count nesting
		104	};
		105
		106	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		107
		108	typedef struct {
		109	U32 flags;
		110	U32 max_depth;
		111	STRLEN max_size;
		112
		113	SV *cb_object;
		114	HV *cb_sk_object;
		115
		116	// for the incremental parser
		117	SV *incr_text; // the source text so far
		118	STRLEN incr_pos; // the current offset into the text
		119	int incr_nest; // {[]}-nesting level
		120	unsigned char incr_mode;
		121	} JSON;
		122
		123	INLINE void
		124	json_init (JSON *json)
		125	{
		126	Zero (json, 1, JSON);
		127	json->max_depth = 512;
		128	}
43		129
44	/////////////////////////////////////////////////////////////////////////////	130	/////////////////////////////////////////////////////////////////////////////
45	// utility functions	131	// utility functions
46		132
47	static UV *	133	INLINE SV *
48	SvJSON (SV *sv)	134	get_bool (const char *name)
49	{	135	{
50	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))	136	SV *sv = get_sv (name, 1);
51	croak ("object is not of type JSON::XS");
52		137
53	return &SvUVX (SvRV (sv));	138	SvREADONLY_on (sv);
54	}	139	SvREADONLY_on (SvRV (sv));
55		140
56	static void	141	return sv;
		142	}
		143
		144	INLINE void
57	shrink (SV *sv)	145	shrink (SV *sv)
58	{	146	{
59	sv_utf8_downgrade (sv, 1);	147	sv_utf8_downgrade (sv, 1);
		148
60	if (SvLEN (sv) > SvCUR (sv) + 1)	149	if (SvLEN (sv) > SvCUR (sv) + 1)
61	{	150	{
62	#ifdef SvPV_shrink_to_cur	151	#ifdef SvPV_shrink_to_cur
63	SvPV_shrink_to_cur (sv);	152	SvPV_shrink_to_cur (sv);
64	#elif defined (SvPV_renew)	153	#elif defined (SvPV_renew)
…		…
70	// decode an utf-8 character and return it, or (UV)-1 in	159	// decode an utf-8 character and return it, or (UV)-1 in
71	// case of an error.	160	// case of an error.
72	// we special-case "safe" characters from U+80 .. U+7FF,	161	// we special-case "safe" characters from U+80 .. U+7FF,
73	// but use the very good perl function to parse anything else.	162	// but use the very good perl function to parse anything else.
74	// note that we never call this function for a ascii codepoints	163	// note that we never call this function for a ascii codepoints
75	static UV	164	INLINE UV
76	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)	165	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
77	{	166	{
78	if (s[0] > 0xdf || s[0] < 0xc2)	167	if (expect_true (len >= 2
79	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);	168	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
80	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)	169	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
81	{	170	{
82	*clen = 2;	171	*clen = 2;
83	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);	172	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
84	}	173	}
85	else	174	else
		175	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		176	}
		177
		178	// likewise for encoding, also never called for ascii codepoints
		179	// this function takes advantage of this fact, although current gccs
		180	// seem to optimise the check for >= 0x80 away anyways
		181	INLINE unsigned char *
		182	encode_utf8 (unsigned char *s, UV ch)
		183	{
		184	if (expect_false (ch < 0x000080))
		185	*s++ = ch;
		186	else if (expect_true (ch < 0x000800))
		187	*s++ = 0xc0 | ( ch >> 6),
		188	*s++ = 0x80 | ( ch & 0x3f);
		189	else if ( ch < 0x010000)
		190	*s++ = 0xe0 | ( ch >> 12),
		191	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		192	*s++ = 0x80 | ( ch & 0x3f);
		193	else if ( ch < 0x110000)
		194	*s++ = 0xf0 | ( ch >> 18),
		195	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		196	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		197	*s++ = 0x80 | ( ch & 0x3f);
		198
		199	return s;
		200	}
		201
		202	// convert offset pointer to character index, sv must be string
		203	static STRLEN
		204	ptr_to_index (SV *sv, char *offset)
		205	{
		206	return SvUTF8 (sv)
		207	? utf8_distance (offset, SvPVX (sv))
		208	: offset - SvPVX (sv);
		209	}
		210
		211	/////////////////////////////////////////////////////////////////////////////
		212	// fp hell
		213
		214	// scan a group of digits, and a trailing exponent
		215	static void
		216	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		217	{
		218	UV uaccum = 0;
		219	int eaccum = 0;
		220
		221	// if we recurse too deep, skip all remaining digits
		222	// to avoid a stack overflow attack
		223	if (expect_false (--maxdepth <= 0))
		224	while (((U8)*s - '0') < 10)
		225	++s;
		226
		227	for (;;)
		228	{
		229	U8 dig = (U8)*s - '0';
		230
		231	if (expect_false (dig >= 10))
		232	{
		233	if (dig == (U8)((U8)'.' - (U8)'0'))
		234	{
		235	++s;
		236	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		237	}
		238	else if ((dig | ' ') == 'e' - '0')
		239	{
		240	int exp2 = 0;
		241	int neg = 0;
		242
		243	++s;
		244
		245	if (*s == '-')
		246	{
		247	++s;
		248	neg = 1;
		249	}
		250	else if (*s == '+')
		251	++s;
		252
		253	while ((dig = (U8)*s - '0') < 10)
		254	exp2 = exp2 * 10 + *s++ - '0';
		255
		256	*expo += neg ? -exp2 : exp2;
		257	}
		258
		259	break;
		260	}
		261
		262	++s;
		263
		264	uaccum = uaccum * 10 + dig;
		265	++eaccum;
		266
		267	// if we have too many digits, then recurse for more
		268	// we actually do this for rather few digits
		269	if (uaccum >= (UV_MAX - 9) / 10)
		270	{
		271	if (postdp) *expo -= eaccum;
		272	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		273	if (postdp) *expo += eaccum;
		274
		275	break;
		276	}
86	{	277	}
87	*clen = (STRLEN)-1;	278
		279	// this relies greatly on the quality of the pow ()
		280	// implementation of the platform, but a good
		281	// implementation is hard to beat.
		282	// (IEEE 754 conformant ones are required to be exact)
		283	if (postdp) *expo -= eaccum;
		284	*accum += uaccum * Perl_pow (10., *expo);
		285	*expo += eaccum;
		286	}
		287
		288	static NV
		289	json_atof (const char *s)
		290	{
		291	NV accum = 0.;
		292	int expo = 0;
		293	int neg = 0;
		294
		295	if (*s == '-')
		296	{
		297	++s;
		298	neg = 1;
		299	}
		300
		301	// a recursion depth of ten gives us >>500 bits
		302	json_atof_scan1 (s, &accum, &expo, 0, 10);
		303
		304	return neg ? -accum : accum;
		305	}
		306
		307	// target of scalar reference is bool? -1 == nope, 0 == false, 1 == true
		308	static int
		309	ref_bool_type (SV *sv)
		310	{
		311	svtype svt = SvTYPE (sv);
		312
		313	if (svt < SVt_PVAV)
		314	{
		315	STRLEN len = 0;
		316	char *pv = svt ? SvPV (sv, len) : 0;
		317
		318	if (len == 1)
		319	if (*pv == '1')
		320	return 1;
		321	else if (*pv == '0')
		322	return 0;
		323	}
		324
		325	return -1;
		326	}
		327
		328	// returns whether scalar is not a reference in the sense of allow_nonref
		329	static int
		330	json_nonref (SV *scalar)
		331	{
		332	if (!SvROK (scalar))
		333	return 1;
		334
		335	scalar = SvRV (scalar);
		336
		337	if (SvTYPE (scalar) >= SVt_PVMG)
		338	{
		339	if (SvSTASH (scalar) == bool_stash)
88	return (UV)-1;	340	return 1;
		341
		342	if (!SvOBJECT (scalar) && ref_bool_type (scalar) >= 0)
		343	return 1;
89	}	344	}
		345
		346	return 0;
90	}	347	}
91		348
92	/////////////////////////////////////////////////////////////////////////////	349	/////////////////////////////////////////////////////////////////////////////
93	// encoder	350	// encoder
94		351
…		…
96	typedef struct	353	typedef struct
97	{	354	{
98	char *cur; // SvPVX (sv) + current output position	355	char *cur; // SvPVX (sv) + current output position
99	char *end; // SvEND (sv)	356	char *end; // SvEND (sv)
100	SV *sv; // result scalar	357	SV *sv; // result scalar
101	U32 flags; // F_*	358	JSON json;
102	U32 indent; // indentation level	359	U32 indent; // indentation level
103	U32 maxdepth; // max. indentation/recursion level	360	UV limit; // escape character values >= this value when encoding
104	} enc_t;	361	} enc_t;
105		362
106	static void	363	INLINE void
107	need (enc_t *enc, STRLEN len)	364	need (enc_t *enc, STRLEN len)
108	{	365	{
109	if (enc->cur + len >= enc->end)	366	if (expect_false (enc->cur + len >= enc->end))
110	{	367	{
111	STRLEN cur = enc->cur - SvPVX (enc->sv);	368	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
112	SvGROW (enc->sv, cur + len + 1);	369	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
113	enc->cur = SvPVX (enc->sv) + cur;	370	enc->cur = SvPVX (enc->sv) + cur;
114	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;	371	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
115	}	372	}
116	}	373	}
117		374
118	static void	375	INLINE void
119	encode_ch (enc_t *enc, char ch)	376	encode_ch (enc_t *enc, char ch)
120	{	377	{
121	need (enc, 1);	378	need (enc, 1);
122	*enc->cur++ = ch;	379	*enc->cur++ = ch;
123	}	380	}
…		…
131		388
132	while (str < end)	389	while (str < end)
133	{	390	{
134	unsigned char ch = *(unsigned char *)str;	391	unsigned char ch = *(unsigned char *)str;
135		392
136	if (ch >= 0x20 && ch < 0x80) // most common case	393	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
137	{	394	{
138	if (ch == '"') // but with slow exceptions	395	if (expect_false (ch == '"')) // but with slow exceptions
139	{	396	{
140	need (enc, len += 1);	397	need (enc, len += 1);
141	*enc->cur++ = '\\';	398	*enc->cur++ = '\\';
142	*enc->cur++ = '"';	399	*enc->cur++ = '"';
143	}	400	}
144	else if (ch == '\\')	401	else if (expect_false (ch == '\\'))
145	{	402	{
146	need (enc, len += 1);	403	need (enc, len += 1);
147	*enc->cur++ = '\\';	404	*enc->cur++ = '\\';
148	*enc->cur++ = '\\';	405	*enc->cur++ = '\\';
149	}	406	}
…		…
167	STRLEN clen;	424	STRLEN clen;
168	UV uch;	425	UV uch;
169		426
170	if (is_utf8)	427	if (is_utf8)
171	{	428	{
172	//uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
173	uch = decode_utf8 (str, end - str, &clen);	429	uch = decode_utf8 (str, end - str, &clen);
174	if (clen == (STRLEN)-1)	430	if (clen == (STRLEN)-1)
175	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	431	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
176	}	432	}
177	else	433	else
178	{	434	{
179	uch = ch;	435	uch = ch;
180	clen = 1;	436	clen = 1;
181	}	437	}
182		438
183	if (uch > 0x10FFFFUL)	439	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
184	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
185
186	if (uch < 0x80 || enc->flags & F_ASCII)
187	{	440	{
188	if (uch > 0xFFFFUL)	441	if (uch >= 0x10000UL)
189	{	442	{
		443	if (uch >= 0x110000UL)
		444	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		445
190	need (enc, len += 11);	446	need (enc, len += 11);
191	sprintf (enc->cur, "\\u%04x\\u%04x",	447	sprintf (enc->cur, "\\u%04x\\u%04x",
192	(int)((uch - 0x10000) / 0x400 + 0xD800),	448	(int)((uch - 0x10000) / 0x400 + 0xD800),
193	(int)((uch - 0x10000) % 0x400 + 0xDC00));	449	(int)((uch - 0x10000) % 0x400 + 0xDC00));
194	enc->cur += 12;	450	enc->cur += 12;
195	}	451	}
196	else	452	else
197	{	453	{
198	static char hexdigit [16] = "0123456789abcdef";
199	need (enc, len += 5);	454	need (enc, len += 5);
200	*enc->cur++ = '\\';	455	*enc->cur++ = '\\';
201	*enc->cur++ = 'u';	456	*enc->cur++ = 'u';
202	*enc->cur++ = hexdigit [ uch >> 12 ];	457	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
203	*enc->cur++ = hexdigit [(uch >> 8) & 15];	458	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
204	*enc->cur++ = hexdigit [(uch >> 4) & 15];	459	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
205	*enc->cur++ = hexdigit [(uch >> 0) & 15];	460	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
206	}	461	}
207		462
		463	str += clen;
		464	}
		465	else if (enc->json.flags & F_LATIN1)
		466	{
		467	*enc->cur++ = uch;
208	str += clen;	468	str += clen;
209	}	469	}
210	else if (is_utf8)	470	else if (is_utf8)
211	{	471	{
212	need (enc, len += clen);	472	need (enc, len += clen);
…		…
216	}	476	}
217	while (--clen);	477	while (--clen);
218	}	478	}
219	else	479	else
220	{	480	{
221	need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed	481	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
222	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	482	enc->cur = encode_utf8 (enc->cur, uch);
223	++str;	483	++str;
224	}	484	}
225	}	485	}
226	}	486	}
227	}	487	}
228		488
229	--len;	489	--len;
230	}	490	}
231	}	491	}
232		492
233	static void	493	INLINE void
234	encode_indent (enc_t *enc)	494	encode_indent (enc_t *enc)
235	{	495	{
236	if (enc->flags & F_INDENT)	496	if (enc->json.flags & F_INDENT)
237	{	497	{
238	int spaces = enc->indent * INDENT_STEP;	498	int spaces = enc->indent * INDENT_STEP;
239		499
240	need (enc, spaces);	500	need (enc, spaces);
241	memset (enc->cur, ' ', spaces);	501	memset (enc->cur, ' ', spaces);
242	enc->cur += spaces;	502	enc->cur += spaces;
243	}	503	}
244	}	504	}
245		505
246	static void	506	INLINE void
247	encode_space (enc_t *enc)	507	encode_space (enc_t *enc)
248	{	508	{
249	need (enc, 1);	509	need (enc, 1);
250	encode_ch (enc, ' ');	510	encode_ch (enc, ' ');
251	}	511	}
252		512
253	static void	513	INLINE void
254	encode_nl (enc_t *enc)	514	encode_nl (enc_t *enc)
255	{	515	{
256	if (enc->flags & F_INDENT)	516	if (enc->json.flags & F_INDENT)
257	{	517	{
258	need (enc, 1);	518	need (enc, 1);
259	encode_ch (enc, '\n');	519	encode_ch (enc, '\n');
260	}	520	}
261	}	521	}
262		522
263	static void	523	INLINE void
264	encode_comma (enc_t *enc)	524	encode_comma (enc_t *enc)
265	{	525	{
266	encode_ch (enc, ',');	526	encode_ch (enc, ',');
267		527
268	if (enc->flags & F_INDENT)	528	if (enc->json.flags & F_INDENT)
269	encode_nl (enc);	529	encode_nl (enc);
270	else if (enc->flags & F_SPACE_AFTER)	530	else if (enc->json.flags & F_SPACE_AFTER)
271	encode_space (enc);	531	encode_space (enc);
272	}	532	}
273		533
274	static void encode_sv (enc_t *enc, SV *sv);	534	static void encode_sv (enc_t *enc, SV *sv);
275		535
276	static void	536	static void
277	encode_av (enc_t *enc, AV *av)	537	encode_av (enc_t *enc, AV *av)
278	{	538	{
279	int i, len = av_len (av);	539	int i, len = av_len (av);
280		540
281	if (enc->indent >= enc->maxdepth)	541	if (enc->indent >= enc->json.max_depth)
282	croak ("data structure too deep (hit recursion limit)");	542	croak (ERR_NESTING_EXCEEDED);
283		543
284	encode_ch (enc, '['); encode_nl (enc);	544	encode_ch (enc, '[');
285	++enc->indent;
286		545
		546	if (len >= 0)
		547	{
		548	encode_nl (enc); ++enc->indent;
		549
287	for (i = 0; i <= len; ++i)	550	for (i = 0; i <= len; ++i)
288	{	551	{
		552	SV **svp = av_fetch (av, i, 0);
		553
289	encode_indent (enc);	554	encode_indent (enc);
290	encode_sv (enc, *av_fetch (av, i, 0));
291		555
		556	if (svp)
		557	encode_sv (enc, *svp);
		558	else
		559	encode_str (enc, "null", 4, 0);
		560
292	if (i < len)	561	if (i < len)
293	encode_comma (enc);	562	encode_comma (enc);
294	}	563	}
295		564
		565	encode_nl (enc); --enc->indent; encode_indent (enc);
		566	}
		567
296	encode_nl (enc);	568	encode_ch (enc, ']');
297
298	--enc->indent;
299	encode_indent (enc); encode_ch (enc, ']');
300	}	569	}
301		570
302	static void	571	static void
303	encode_he (enc_t *enc, HE *he)	572	encode_hk (enc_t *enc, HE *he)
304	{	573	{
305	encode_ch (enc, '"');	574	encode_ch (enc, '"');
306		575
307	if (HeKLEN (he) == HEf_SVKEY)	576	if (HeKLEN (he) == HEf_SVKEY)
308	{	577	{
309	SV *sv = HeSVKEY (he);	578	SV *sv = HeSVKEY (he);
310	STRLEN len;	579	STRLEN len;
311	char *str;	580	char *str;
312		581
313	SvGETMAGIC (sv);	582	SvGETMAGIC (sv);
314	str = SvPV (sv, len);	583	str = SvPV (sv, len);
315		584
316	encode_str (enc, str, len, SvUTF8 (sv));	585	encode_str (enc, str, len, SvUTF8 (sv));
317	}	586	}
318	else	587	else
319	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	588	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
320		589
321	encode_ch (enc, '"');	590	encode_ch (enc, '"');
322		591
323	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	592	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
324	encode_ch (enc, ':');	593	encode_ch (enc, ':');
325	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	594	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
326	encode_sv (enc, HeVAL (he));
327	}	595	}
328		596
329	// compare hash entries, used when all keys are bytestrings	597	// compare hash entries, used when all keys are bytestrings
330	static int	598	static int
331	he_cmp_fast (const void *a_, const void *b_)	599	he_cmp_fast (const void *a_, const void *b_)
…		…
336	HE *b = *(HE **)b_;	604	HE *b = *(HE **)b_;
337		605
338	STRLEN la = HeKLEN (a);	606	STRLEN la = HeKLEN (a);
339	STRLEN lb = HeKLEN (b);	607	STRLEN lb = HeKLEN (b);
340		608
341	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	609	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
342	cmp = la - lb;	610	cmp = lb - la;
343		611
344	return cmp;	612	return cmp;
345	}	613	}
346		614
347	// compare hash entries, used when some keys are sv's or utf-x	615	// compare hash entries, used when some keys are sv's or utf-x
348	static int	616	static int
349	he_cmp_slow (const void *a, const void *b)	617	he_cmp_slow (const void *a, const void *b)
350	{	618	{
351	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	619	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
352	}	620	}
353		621
354	static void	622	static void
355	encode_hv (enc_t *enc, HV *hv)	623	encode_hv (enc_t *enc, HV *hv)
356	{	624	{
357	int count, i;	625	HE *he;
358		626
359	if (enc->indent >= enc->maxdepth)	627	if (enc->indent >= enc->json.max_depth)
360	croak ("data structure too deep (hit recursion limit)");	628	croak (ERR_NESTING_EXCEEDED);
361		629
362	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	630	encode_ch (enc, '{');
363		631
364	if ((count = hv_iterinit (hv)))
365	{
366	// for canonical output we have to sort by keys first	632	// for canonical output we have to sort by keys first
367	// actually, this is mostly due to the stupid so-called	633	// actually, this is mostly due to the stupid so-called
368	// security workaround added somewhere in 5.8.x.	634	// security workaround added somewhere in 5.8.x
369	// that randomises hash orderings	635	// that randomises hash orderings
370	if (enc->flags & F_CANONICAL)	636	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		637	{
		638	int count = hv_iterinit (hv);
		639
		640	if (SvMAGICAL (hv))
371	{	641	{
372	HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode	642	// need to count by iterating. could improve by dynamically building the vector below
		643	// but I don't care for the speed of this special case.
		644	// note also that we will run into undefined behaviour when the two iterations
		645	// do not result in the same count, something I might care for in some later release.
		646
		647	count = 0;
		648	while (hv_iternext (hv))
		649	++count;
		650
		651	hv_iterinit (hv);
		652	}
		653
		654	if (count)
		655	{
373	int fast = 1;	656	int i, fast = 1;
		657	HE *hes_stack [STACK_HES];
		658	HE **hes = hes_stack;
		659
		660	// allocate larger arrays on the heap
		661	if (count > STACK_HES)
		662	{
		663	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		664	hes = (HE **)SvPVX (sv);
		665	}
374		666
375	i = 0;	667	i = 0;
376	while ((he = hv_iternext (hv)))	668	while ((he = hv_iternext (hv)))
377	{	669	{
378	hes [i++] = he;	670	hes [i++] = he;
…		…
400		692
401	FREETMPS;	693	FREETMPS;
402	LEAVE;	694	LEAVE;
403	}	695	}
404		696
405	for (i = 0; i < count; ++i)	697	encode_nl (enc); ++enc->indent;
		698
		699	while (count--)
406	{	700	{
407	encode_indent (enc);	701	encode_indent (enc);
		702	he = hes [count];
408	encode_he (enc, hes [i]);	703	encode_hk (enc, he);
		704	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
409		705
410	if (i < count - 1)	706	if (count)
411	encode_comma (enc);	707	encode_comma (enc);
412	}	708	}
413		709
414	encode_nl (enc);	710	encode_nl (enc); --enc->indent; encode_indent (enc);
415	}	711	}
		712	}
416	else	713	else
		714	{
		715	if (hv_iterinit (hv) || SvMAGICAL (hv))
		716	if ((he = hv_iternext (hv)))
417	{	717	{
418	HE *he = hv_iternext (hv);	718	encode_nl (enc); ++enc->indent;
419		719
420	for (;;)	720	for (;;)
421	{	721	{
422	encode_indent (enc);	722	encode_indent (enc);
423	encode_he (enc, he);	723	encode_hk (enc, he);
		724	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
424		725
425	if (!(he = hv_iternext (hv)))	726	if (!(he = hv_iternext (hv)))
426	break;	727	break;
427		728
428	encode_comma (enc);	729	encode_comma (enc);
429	}	730	}
430		731
431	encode_nl (enc);	732	encode_nl (enc); --enc->indent; encode_indent (enc);
432	}	733	}
433	}	734	}
434		735
435	--enc->indent; encode_indent (enc); encode_ch (enc, '}');	736	encode_ch (enc, '}');
436	}	737	}
437		738
438	// encode objects, arrays and special \0=false and \1=true values.	739	// encode objects, arrays and special \0=false and \1=true values.
439	static void	740	static void
440	encode_rv (enc_t *enc, SV *sv)	741	encode_rv (enc_t *enc, SV *sv)
441	{	742	{
442	svtype svt;	743	svtype svt;
		744	GV *method;
443		745
444	SvGETMAGIC (sv);	746	SvGETMAGIC (sv);
445	svt = SvTYPE (sv);	747	svt = SvTYPE (sv);
446		748
		749	if (expect_false (SvOBJECT (sv)))
		750	{
		751	HV *stash = SvSTASH (sv);
		752
		753	if (stash == bool_stash)
		754	{
		755	if (SvIV (sv))
		756	encode_str (enc, "true", 4, 0);
		757	else
		758	encode_str (enc, "false", 5, 0);
		759	}
		760	else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
		761	{
		762	int count;
		763	dSP;
		764
		765	ENTER; SAVETMPS;
		766	SAVESTACK_POS ();
		767	PUSHMARK (SP);
		768	EXTEND (SP, 2);
		769	// we re-bless the reference to get overload and other niceties right
		770	PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		771	PUSHs (sv_json);
		772
		773	PUTBACK;
		774	count = call_sv ((SV *)GvCV (method), G_ARRAY);
		775	SPAGAIN;
		776
		777	// catch this surprisingly common error
		778	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		779	croak ("%s::FREEZE method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		780
		781	encode_ch (enc, '(');
		782	encode_ch (enc, '"');
		783	encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
		784	encode_ch (enc, '"');
		785	encode_ch (enc, ')');
		786	encode_ch (enc, '[');
		787
		788	while (count)
		789	{
		790	encode_sv (enc, SP[1 - count--]);
		791
		792	if (count)
		793	encode_ch (enc, ',');
		794	}
		795
		796	encode_ch (enc, ']');
		797
		798	FREETMPS; LEAVE;
		799	}
		800	else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
		801	{
		802	dSP;
		803
		804	ENTER; SAVETMPS;
		805	PUSHMARK (SP);
		806	// we re-bless the reference to get overload and other niceties right
		807	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		808
		809	// calling with G_SCALAR ensures that we always get a 1 return value
		810	PUTBACK;
		811	call_sv ((SV *)GvCV (method), G_SCALAR);
		812	SPAGAIN;
		813
		814	// catch this surprisingly common error
		815	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		816	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		817
		818	sv = POPs;
		819	PUTBACK;
		820
		821	encode_sv (enc, sv);
		822
		823	FREETMPS; LEAVE;
		824	}
		825	else if (enc->json.flags & F_ALLOW_BLESSED)
		826	encode_str (enc, "null", 4, 0);
		827	else
		828	croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)",
		829	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		830	}
447	if (svt == SVt_PVHV)	831	else if (svt == SVt_PVHV)
448	encode_hv (enc, (HV *)sv);	832	encode_hv (enc, (HV *)sv);
449	else if (svt == SVt_PVAV)	833	else if (svt == SVt_PVAV)
450	encode_av (enc, (AV *)sv);	834	encode_av (enc, (AV *)sv);
451	else if (svt < SVt_PVAV)	835	else if (svt < SVt_PVAV)
452	{	836	{
453	if (SvNIOK (sv) && SvIV (sv) == 0)	837	int bool_type = ref_bool_type (sv);
		838
		839	if (bool_type == 1)
		840	encode_str (enc, "true", 4, 0);
		841	else if (bool_type == 0)
454	encode_str (enc, "false", 5, 0);	842	encode_str (enc, "false", 5, 0);
455	else if (SvNIOK (sv) && SvIV (sv) == 1)	843	else if (enc->json.flags & F_ALLOW_UNKNOWN)
456	encode_str (enc, "true", 4, 0);	844	encode_str (enc, "null", 4, 0);
457	else	845	else
458	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",	846	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
459	SvPV_nolen (sv_2mortal (newRV_inc (sv))));	847	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
460	}	848	}
		849	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		850	encode_str (enc, "null", 4, 0);
461	else	851	else
462	croak ("encountered %s, but JSON can only represent references to arrays or hashes",	852	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
463	SvPV_nolen (sv_2mortal (newRV_inc (sv))));	853	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
464	}	854	}
465		855
…		…
476	encode_str (enc, str, len, SvUTF8 (sv));	866	encode_str (enc, str, len, SvUTF8 (sv));
477	encode_ch (enc, '"');	867	encode_ch (enc, '"');
478	}	868	}
479	else if (SvNOKp (sv))	869	else if (SvNOKp (sv))
480	{	870	{
		871	// trust that perl will do the right thing w.r.t. JSON syntax.
481	need (enc, NV_DIG + 32);	872	need (enc, NV_DIG + 32);
482	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	873	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
483	enc->cur += strlen (enc->cur);	874	enc->cur += strlen (enc->cur);
484	}	875	}
485	else if (SvIOKp (sv))	876	else if (SvIOKp (sv))
486	{	877	{
		878	// we assume we can always read an IV as a UV and vice versa
		879	// we assume two's complement
		880	// we assume no aliasing issues in the union
		881	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		882	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		883	{
		884	// optimise the "small number case"
		885	// code will likely be branchless and use only a single multiplication
		886	// works for numbers up to 59074
		887	I32 i = SvIVX (sv);
		888	U32 u;
		889	char digit, nz = 0;
		890
487	need (enc, 64);	891	need (enc, 6);
		892
		893	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		894	u = i < 0 ? -i : i;
		895
		896	// convert to 4.28 fixed-point representation
		897	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		898
		899	// now output digit by digit, each time masking out the integer part
		900	// and multiplying by 5 while moving the decimal point one to the right,
		901	// resulting in a net multiplication by 10.
		902	// we always write the digit to memory but conditionally increment
		903	// the pointer, to enable the use of conditional move instructions.
		904	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		905	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		906	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		907	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		908	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		909	}
		910	else
		911	{
		912	// large integer, use the (rather slow) snprintf way.
		913	need (enc, IVUV_MAXCHARS);
488	enc->cur +=	914	enc->cur +=
489	SvIsUV(sv)	915	SvIsUV(sv)
490	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	916	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
491	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	917	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		918	}
492	}	919	}
493	else if (SvROK (sv))	920	else if (SvROK (sv))
494	encode_rv (enc, SvRV (sv));	921	encode_rv (enc, SvRV (sv));
495	else if (!SvOK (sv))	922	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
496	encode_str (enc, "null", 4, 0);	923	encode_str (enc, "null", 4, 0);
497	else	924	else
498	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	925	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
499	SvPV_nolen (sv), SvFLAGS (sv));	926	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
500	}	927	}
501		928
502	static SV *	929	static SV *
503	encode_json (SV *scalar, U32 flags)	930	encode_json (SV *scalar, JSON *json)
504	{	931	{
505	enc_t enc;	932	enc_t enc;
506		933
507	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	934	if (!(json->flags & F_ALLOW_NONREF) && json_nonref (scalar))
508	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	935	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
509		936
510	enc.flags = flags;	937	enc.json = *json;
511	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	938	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
512	enc.cur = SvPVX (enc.sv);	939	enc.cur = SvPVX (enc.sv);
513	enc.end = SvEND (enc.sv);	940	enc.end = SvEND (enc.sv);
514	enc.indent = 0;	941	enc.indent = 0;
515	enc.maxdepth = DEC_DEPTH (flags);	942	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		943	: enc.json.flags & F_LATIN1 ? 0x000100UL
		944	: 0x110000UL;
516		945
517	SvPOK_only (enc.sv);	946	SvPOK_only (enc.sv);
518	encode_sv (&enc, scalar);	947	encode_sv (&enc, scalar);
519		948	encode_nl (&enc);
520	if (!(flags & (F_ASCII | F_UTF8)))
521	SvUTF8_on (enc.sv);
522		949
523	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	950	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
524	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings	951	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
525		952
		953	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
		954	SvUTF8_on (enc.sv);
		955
526	if (enc.flags & F_SHRINK)	956	if (enc.json.flags & F_SHRINK)
527	shrink (enc.sv);	957	shrink (enc.sv);
528		958
529	return enc.sv;	959	return enc.sv;
530	}	960	}
531		961
…		…
536	typedef struct	966	typedef struct
537	{	967	{
538	char *cur; // current parser pointer	968	char *cur; // current parser pointer
539	char *end; // end of input string	969	char *end; // end of input string
540	const char *err; // parse error, if != 0	970	const char *err; // parse error, if != 0
541	U32 flags; // F_*	971	JSON json;
542	U32 depth; // recursion depth	972	U32 depth; // recursion depth
543	U32 maxdepth; // recursion depth limit	973	U32 maxdepth; // recursion depth limit
544	} dec_t;	974	} dec_t;
545		975
546	static void	976	INLINE void
		977	decode_comment (dec_t *dec)
		978	{
		979	// only '#'-style comments allowed a.t.m.
		980
		981	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		982	++dec->cur;
		983	}
		984
		985	INLINE void
547	decode_ws (dec_t *dec)	986	decode_ws (dec_t *dec)
548	{	987	{
549	for (;;)	988	for (;;)
550	{	989	{
551	char ch = *dec->cur;	990	char ch = *dec->cur;
552		991
553	if (ch > 0x20	992	if (ch > 0x20)
		993	{
		994	if (expect_false (ch == '#'))
		995	{
		996	if (dec->json.flags & F_RELAXED)
		997	decode_comment (dec);
		998	else
		999	break;
		1000	}
		1001	else
		1002	break;
		1003	}
554	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	1004	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
555	break;	1005	break; // parse error, but let higher level handle it, gives better error messages
556		1006
557	++dec->cur;	1007	++dec->cur;
558	}	1008	}
559	}	1009	}
560		1010
…		…
564	if (*dec->cur != ch) \	1014	if (*dec->cur != ch) \
565	ERR (# ch " expected"); \	1015	ERR (# ch " expected"); \
566	++dec->cur; \	1016	++dec->cur; \
567	SE	1017	SE
568		1018
569	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")	1019	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
570	#define DEC_DEC_DEPTH --dec->depth	1020	#define DEC_DEC_DEPTH --dec->depth
571		1021
572	static SV *decode_sv (dec_t *dec);	1022	static SV *decode_sv (dec_t *dec);
573		1023
574	static signed char decode_hexdigit[256];	1024	static signed char decode_hexdigit[256];
…		…
577	decode_4hex (dec_t *dec)	1027	decode_4hex (dec_t *dec)
578	{	1028	{
579	signed char d1, d2, d3, d4;	1029	signed char d1, d2, d3, d4;
580	unsigned char *cur = (unsigned char *)dec->cur;	1030	unsigned char *cur = (unsigned char *)dec->cur;
581		1031
582	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	1032	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
583	d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected");	1033	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
584	d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected");	1034	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
585	d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected");	1035	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
586		1036
587	dec->cur += 4;	1037	dec->cur += 4;
588		1038
589	return ((UV)d1) << 12	1039	return ((UV)d1) << 12
590	| ((UV)d2) << 8	1040	| ((UV)d2) << 8
…		…
598	static SV *	1048	static SV *
599	decode_str (dec_t *dec)	1049	decode_str (dec_t *dec)
600	{	1050	{
601	SV *sv = 0;	1051	SV *sv = 0;
602	int utf8 = 0;	1052	int utf8 = 0;
		1053	char *dec_cur = dec->cur;
603		1054
604	do	1055	do
605	{	1056	{
606	char buf [SHORT_STRING_LEN + UTF8_MAX_LEN];	1057	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
607	char *cur = buf;	1058	char *cur = buf;
608		1059
609	do	1060	do
610	{	1061	{
611	unsigned char ch = *(unsigned char *)dec->cur++;	1062	unsigned char ch = *(unsigned char *)dec_cur++;
612		1063
613	if (ch == '"')	1064	if (expect_false (ch == '"'))
614	{	1065	{
615	--dec->cur;	1066	--dec_cur;
616	break;	1067	break;
617	}	1068	}
618	else if (ch == '\\')	1069	else if (expect_false (ch == '\\'))
619	{	1070	{
620	switch (*dec->cur)	1071	switch (*dec_cur)
621	{	1072	{
622	case '\\':	1073	case '\\':
623	case '/':	1074	case '/':
624	case '"': *cur++ = *dec->cur++; break;	1075	case '"': *cur++ = *dec_cur++; break;
625		1076
626	case 'b': ++dec->cur; *cur++ = '\010'; break;	1077	case 'b': ++dec_cur; *cur++ = '\010'; break;
627	case 't': ++dec->cur; *cur++ = '\011'; break;	1078	case 't': ++dec_cur; *cur++ = '\011'; break;
628	case 'n': ++dec->cur; *cur++ = '\012'; break;	1079	case 'n': ++dec_cur; *cur++ = '\012'; break;
629	case 'f': ++dec->cur; *cur++ = '\014'; break;	1080	case 'f': ++dec_cur; *cur++ = '\014'; break;
630	case 'r': ++dec->cur; *cur++ = '\015'; break;	1081	case 'r': ++dec_cur; *cur++ = '\015'; break;
631		1082
632	case 'u':	1083	case 'u':
633	{	1084	{
634	UV lo, hi;	1085	UV lo, hi;
635	++dec->cur;	1086	++dec_cur;
636		1087
		1088	dec->cur = dec_cur;
637	hi = decode_4hex (dec);	1089	hi = decode_4hex (dec);
		1090	dec_cur = dec->cur;
638	if (hi == (UV)-1)	1091	if (hi == (UV)-1)
639	goto fail;	1092	goto fail;
640		1093
641	// possibly a surrogate pair	1094	// possibly a surrogate pair
642	if (hi >= 0xd800)	1095	if (hi >= 0xd800)
643	if (hi < 0xdc00)	1096	if (hi < 0xdc00)
644	{	1097	{
645	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1098	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
646	ERR ("missing low surrogate character in surrogate pair");	1099	ERR ("missing low surrogate character in surrogate pair");
647		1100
648	dec->cur += 2;	1101	dec_cur += 2;
649		1102
		1103	dec->cur = dec_cur;
650	lo = decode_4hex (dec);	1104	lo = decode_4hex (dec);
		1105	dec_cur = dec->cur;
651	if (lo == (UV)-1)	1106	if (lo == (UV)-1)
652	goto fail;	1107	goto fail;
653		1108
654	if (lo < 0xdc00 || lo >= 0xe000)	1109	if (lo < 0xdc00 || lo >= 0xe000)
655	ERR ("surrogate pair expected");	1110	ERR ("surrogate pair expected");
…		…
661		1116
662	if (hi >= 0x80)	1117	if (hi >= 0x80)
663	{	1118	{
664	utf8 = 1;	1119	utf8 = 1;
665		1120
666	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);	1121	cur = encode_utf8 (cur, hi);
667	}	1122	}
668	else	1123	else
669	*cur++ = hi;	1124	*cur++ = hi;
670	}	1125	}
671	break;	1126	break;
672		1127
673	default:	1128	default:
674	--dec->cur;	1129	--dec_cur;
675	ERR ("illegal backslash escape sequence in string");	1130	ERR ("illegal backslash escape sequence in string");
676	}	1131	}
677	}	1132	}
678	else if (ch >= 0x20 && ch <= 0x7f)	1133	else if (expect_true (ch >= 0x20 && ch < 0x80))
679	*cur++ = ch;	1134	*cur++ = ch;
680	else if (ch >= 0x80)	1135	else if (ch >= 0x80)
681	{	1136	{
682	STRLEN clen;	1137	STRLEN clen;
683	UV uch;
684		1138
685	--dec->cur;	1139	--dec_cur;
686		1140
687	uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);	1141	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
688	if (clen == (STRLEN)-1)	1142	if (clen == (STRLEN)-1)
689	ERR ("malformed UTF-8 character in JSON string");	1143	ERR ("malformed UTF-8 character in JSON string");
690		1144
691	do	1145	do
692	*cur++ = *dec->cur++;	1146	*cur++ = *dec_cur++;
693	while (--clen);	1147	while (--clen);
694		1148
695	utf8 = 1;	1149	utf8 = 1;
696	}	1150	}
		1151	else if (ch == '\t' && dec->json.flags & F_RELAXED)
		1152	*cur++ = ch;
697	else	1153	else
698	{	1154	{
699	--dec->cur;	1155	--dec_cur;
700		1156
701	if (!ch)	1157	if (!ch)
702	ERR ("unexpected end of string while parsing JSON string");	1158	ERR ("unexpected end of string while parsing JSON string");
703	else	1159	else
704	ERR ("invalid character encountered while parsing JSON string");	1160	ERR ("invalid character encountered while parsing JSON string");
…		…
709	{	1165	{
710	STRLEN len = cur - buf;	1166	STRLEN len = cur - buf;
711		1167
712	if (sv)	1168	if (sv)
713	{	1169	{
714	SvGROW (sv, SvCUR (sv) + len + 1);	1170	STRLEN cur = SvCUR (sv);
		1171
		1172	if (SvLEN (sv) <= cur + len)
		1173	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1174
715	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	1175	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
716	SvCUR_set (sv, SvCUR (sv) + len);	1176	SvCUR_set (sv, SvCUR (sv) + len);
717	}	1177	}
718	else	1178	else
719	sv = newSVpvn (buf, len);	1179	sv = newSVpvn (buf, len);
720	}	1180	}
721	}	1181	}
722	while (*dec->cur != '"');	1182	while (*dec_cur != '"');
723		1183
724	++dec->cur;	1184	++dec_cur;
725		1185
726	if (sv)	1186	if (sv)
727	{	1187	{
728	SvPOK_only (sv);	1188	SvPOK_only (sv);
729	*SvEND (sv) = 0;	1189	*SvEND (sv) = 0;
…		…
732	SvUTF8_on (sv);	1192	SvUTF8_on (sv);
733	}	1193	}
734	else	1194	else
735	sv = newSVpvn ("", 0);	1195	sv = newSVpvn ("", 0);
736		1196
		1197	dec->cur = dec_cur;
737	return sv;	1198	return sv;
738		1199
739	fail:	1200	fail:
		1201	dec->cur = dec_cur;
740	return 0;	1202	return 0;
741	}	1203	}
742		1204
743	static SV *	1205	static SV *
744	decode_num (dec_t *dec)	1206	decode_num (dec_t *dec)
…		…
802	is_nv = 1;	1264	is_nv = 1;
803	}	1265	}
804		1266
805	if (!is_nv)	1267	if (!is_nv)
806	{	1268	{
807	UV uv;	1269	int len = dec->cur - start;
808	int numtype = grok_number (start, dec->cur - start, &uv);	1270
809	if (numtype & IS_NUMBER_IN_UV)	1271	// special case the rather common 1..5-digit-int case
810	if (numtype & IS_NUMBER_NEG)	1272	if (*start == '-')
		1273	switch (len)
811	{	1274	{
812	if (uv < (UV)IV_MIN)	1275	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
813	return newSViv (-(IV)uv);	1276	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1277	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1278	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1279	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
814	}	1280	}
		1281	else
		1282	switch (len)
		1283	{
		1284	case 1: return newSViv ( start [0] - '0' * 1);
		1285	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1286	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1287	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1288	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1289	}
		1290
		1291	{
		1292	UV uv;
		1293	int numtype = grok_number (start, len, &uv);
		1294	if (numtype & IS_NUMBER_IN_UV)
		1295	if (numtype & IS_NUMBER_NEG)
		1296	{
		1297	if (uv < (UV)IV_MIN)
		1298	return newSViv (-(IV)uv);
		1299	}
815	else	1300	else
816	return newSVuv (uv);	1301	return newSVuv (uv);
817	}	1302	}
818		1303
		1304	len -= *start == '-' ? 1 : 0;
		1305
		1306	// does not fit into IV or UV, try NV
		1307	if (len <= NV_DIG)
		1308	// fits into NV without loss of precision
		1309	return newSVnv (json_atof (start));
		1310
		1311	// everything else fails, convert it to a string
		1312	return newSVpvn (start, dec->cur - start);
		1313	}
		1314
		1315	// loss of precision here
819	return newSVnv (Atof (start));	1316	return newSVnv (json_atof (start));
820		1317
821	fail:	1318	fail:
822	return 0;	1319	return 0;
823	}	1320	}
824		1321
…		…
848	if (*dec->cur == ']')	1345	if (*dec->cur == ']')
849	{	1346	{
850	++dec->cur;	1347	++dec->cur;
851	break;	1348	break;
852	}	1349	}
853		1350
854	if (*dec->cur != ',')	1351	if (*dec->cur != ',')
855	ERR (", or ] expected while parsing array");	1352	ERR (", or ] expected while parsing array");
856		1353
857	++dec->cur;	1354	++dec->cur;
		1355
		1356	decode_ws (dec);
		1357
		1358	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1359	{
		1360	++dec->cur;
		1361	break;
		1362	}
858	}	1363	}
859		1364
860	DEC_DEC_DEPTH;	1365	DEC_DEC_DEPTH;
861	return newRV_noinc ((SV *)av);	1366	return newRV_noinc ((SV *)av);
862		1367
…		…
867	}	1372	}
868		1373
869	static SV *	1374	static SV *
870	decode_hv (dec_t *dec)	1375	decode_hv (dec_t *dec)
871	{	1376	{
		1377	SV *sv;
872	HV *hv = newHV ();	1378	HV *hv = newHV ();
873		1379
874	DEC_INC_DEPTH;	1380	DEC_INC_DEPTH;
875	decode_ws (dec);	1381	decode_ws (dec);
876		1382
877	if (*dec->cur == '}')	1383	if (*dec->cur == '}')
878	++dec->cur;	1384	++dec->cur;
879	else	1385	else
880	for (;;)	1386	for (;;)
881	{	1387	{
		1388	EXPECT_CH ('"');
		1389
		1390	// heuristic: assume that
		1391	// a) decode_str + hv_store_ent are abysmally slow.
		1392	// b) most hash keys are short, simple ascii text.
		1393	// => try to "fast-match" such strings to avoid
		1394	// the overhead of decode_str + hv_store_ent.
		1395	{
882	SV *key, *value;	1396	SV *value;
		1397	char *p = dec->cur;
		1398	char *e = p + 24; // only try up to 24 bytes
883		1399
884	decode_ws (dec); EXPECT_CH ('"');	1400	for (;;)
885
886	key = decode_str (dec);
887	if (!key)
888	goto fail;
889
890	decode_ws (dec); EXPECT_CH (':');
891
892	value = decode_sv (dec);
893	if (!value)
894	{	1401	{
		1402	// the >= 0x80 is false on most architectures
		1403	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1404	{
		1405	// slow path, back up and use decode_str
		1406	SV *key = decode_str (dec);
		1407	if (!key)
		1408	goto fail;
		1409
		1410	decode_ws (dec); EXPECT_CH (':');
		1411
		1412	decode_ws (dec);
		1413	value = decode_sv (dec);
		1414	if (!value)
		1415	{
		1416	SvREFCNT_dec (key);
		1417	goto fail;
		1418	}
		1419
		1420	hv_store_ent (hv, key, value, 0);
895	SvREFCNT_dec (key);	1421	SvREFCNT_dec (key);
		1422
		1423	break;
		1424	}
		1425	else if (*p == '"')
		1426	{
		1427	// fast path, got a simple key
		1428	char *key = dec->cur;
		1429	int len = p - key;
		1430	dec->cur = p + 1;
		1431
		1432	decode_ws (dec); EXPECT_CH (':');
		1433
		1434	decode_ws (dec);
		1435	value = decode_sv (dec);
		1436	if (!value)
896	goto fail;	1437	goto fail;
		1438
		1439	hv_store (hv, key, len, value, 0);
		1440
		1441	break;
		1442	}
		1443
		1444	++p;
897	}	1445	}
898		1446	}
899	hv_store_ent (hv, key, value, 0);
900	SvREFCNT_dec (key);
901		1447
902	decode_ws (dec);	1448	decode_ws (dec);
903		1449
904	if (*dec->cur == '}')	1450	if (*dec->cur == '}')
905	{	1451	{
…		…
909		1455
910	if (*dec->cur != ',')	1456	if (*dec->cur != ',')
911	ERR (", or } expected while parsing object/hash");	1457	ERR (", or } expected while parsing object/hash");
912		1458
913	++dec->cur;	1459	++dec->cur;
		1460
		1461	decode_ws (dec);
		1462
		1463	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1464	{
		1465	++dec->cur;
		1466	break;
		1467	}
914	}	1468	}
915		1469
916	DEC_DEC_DEPTH;	1470	DEC_DEC_DEPTH;
917	return newRV_noinc ((SV *)hv);	1471	sv = newRV_noinc ((SV *)hv);
		1472
		1473	// check filter callbacks
		1474	if (dec->json.flags & F_HOOK)
		1475	{
		1476	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1477	{
		1478	HE *cb, *he;
		1479
		1480	hv_iterinit (hv);
		1481	he = hv_iternext (hv);
		1482	hv_iterinit (hv);
		1483
		1484	// the next line creates a mortal sv each time it's called.
		1485	// might want to optimise this for common cases.
		1486	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1487
		1488	if (cb)
		1489	{
		1490	dSP;
		1491	int count;
		1492
		1493	ENTER; SAVETMPS;
		1494	SAVESTACK_POS ();
		1495	PUSHMARK (SP);
		1496	XPUSHs (HeVAL (he));
		1497	sv_2mortal (sv);
		1498
		1499	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1500
		1501	if (count == 1)
		1502	{
		1503	sv = newSVsv (POPs);
		1504	FREETMPS; LEAVE;
		1505	return sv;
		1506	}
		1507
		1508	SvREFCNT_inc (sv);
		1509	FREETMPS; LEAVE;
		1510	}
		1511	}
		1512
		1513	if (dec->json.cb_object)
		1514	{
		1515	dSP;
		1516	int count;
		1517
		1518	ENTER; SAVETMPS;
		1519	SAVESTACK_POS ();
		1520	PUSHMARK (SP);
		1521	XPUSHs (sv_2mortal (sv));
		1522
		1523	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1524
		1525	if (count == 1)
		1526	{
		1527	sv = newSVsv (POPs);
		1528	FREETMPS; LEAVE;
		1529	return sv;
		1530	}
		1531
		1532	SvREFCNT_inc (sv);
		1533	FREETMPS; LEAVE;
		1534	}
		1535	}
		1536
		1537	return sv;
918		1538
919	fail:	1539	fail:
920	SvREFCNT_dec (hv);	1540	SvREFCNT_dec (hv);
921	DEC_DEC_DEPTH;	1541	DEC_DEC_DEPTH;
922	return 0;	1542	return 0;
923	}	1543	}
924		1544
925	static SV *	1545	static SV *
		1546	decode_tag (dec_t *dec)
		1547	{
		1548	SV *tag = 0;
		1549	SV *val = 0;
		1550
		1551	if (!(dec->json.flags & F_ALLOW_TAGS))
		1552	ERR ("malformed JSON string, neither array, object, number, string or atom");
		1553
		1554	++dec->cur;
		1555
		1556	decode_ws (dec);
		1557
		1558	tag = decode_sv (dec);
		1559	if (!tag)
		1560	goto fail;
		1561
		1562	if (!SvPOK (tag))
		1563	ERR ("malformed JSON string, (tag) must be a string");
		1564
		1565	decode_ws (dec);
		1566
		1567	if (*dec->cur != ')')
		1568	ERR (") expected after tag");
		1569
		1570	++dec->cur;
		1571
		1572	decode_ws (dec);
		1573
		1574	val = decode_sv (dec);
		1575	if (!val)
		1576	goto fail;
		1577
		1578	if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
		1579	ERR ("malformed JSON string, tag value must be an array");
		1580
		1581	{
		1582	AV *av = (AV *)SvRV (val);
		1583	int i, len = av_len (av) + 1;
		1584	HV *stash = gv_stashsv (tag, 0);
		1585	SV *sv;
		1586
		1587	if (!stash)
		1588	ERR ("cannot decode perl-object (package does not exist)");
		1589
		1590	GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
		1591
		1592	if (!method)
		1593	ERR ("cannot decode perl-object (package does not have a THAW method)");
		1594
		1595	dSP;
		1596
		1597	ENTER; SAVETMPS;
		1598	PUSHMARK (SP);
		1599	EXTEND (SP, len + 2);
		1600	// we re-bless the reference to get overload and other niceties right
		1601	PUSHs (tag);
		1602	PUSHs (sv_json);
		1603
		1604	for (i = 0; i < len; ++i)
		1605	PUSHs (*av_fetch (av, i, 1));
		1606
		1607	PUTBACK;
		1608	call_sv ((SV *)GvCV (method), G_SCALAR);
		1609	SPAGAIN;
		1610
		1611	SvREFCNT_dec (tag);
		1612	SvREFCNT_dec (val);
		1613	sv = SvREFCNT_inc (POPs);
		1614
		1615	PUTBACK;
		1616
		1617	FREETMPS; LEAVE;
		1618
		1619	return sv;
		1620	}
		1621
		1622	fail:
		1623	SvREFCNT_dec (tag);
		1624	SvREFCNT_dec (val);
		1625	return 0;
		1626	}
		1627
		1628	static SV *
926	decode_sv (dec_t *dec)	1629	decode_sv (dec_t *dec)
927	{	1630	{
928	decode_ws (dec);	1631	// the beauty of JSON: you need exactly one character lookahead
		1632	// to parse everything.
929	switch (*dec->cur)	1633	switch (*dec->cur)
930	{	1634	{
931	case '"': ++dec->cur; return decode_str (dec);	1635	case '"': ++dec->cur; return decode_str (dec);
932	case '[': ++dec->cur; return decode_av (dec);	1636	case '[': ++dec->cur; return decode_av (dec);
933	case '{': ++dec->cur; return decode_hv (dec);	1637	case '{': ++dec->cur; return decode_hv (dec);
		1638	case '(': return decode_tag (dec);
934		1639
935	case '-':	1640	case '-':
936	case '0': case '1': case '2': case '3': case '4':	1641	case '0': case '1': case '2': case '3': case '4':
937	case '5': case '6': case '7': case '8': case '9':	1642	case '5': case '6': case '7': case '8': case '9':
938	return decode_num (dec);	1643	return decode_num (dec);
939		1644
940	case 't':	1645	case 't':
941	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1646	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
942	{	1647	{
943	dec->cur += 4;	1648	dec->cur += 4;
		1649	#if JSON_SLOW
		1650	bool_true = get_bool ("Types::Serialiser::true");
		1651	#endif
944	return newSViv (1);	1652	return newSVsv (bool_true);
945	}	1653	}
946	else	1654	else
947	ERR ("'true' expected");	1655	ERR ("'true' expected");
948		1656
949	break;	1657	break;
950		1658
951	case 'f':	1659	case 'f':
952	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1660	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
953	{	1661	{
954	dec->cur += 5;	1662	dec->cur += 5;
		1663	#if JSON_SLOW
		1664	bool_false = get_bool ("Types::Serialiser::false");
		1665	#endif
955	return newSViv (0);	1666	return newSVsv (bool_false);
956	}	1667	}
957	else	1668	else
958	ERR ("'false' expected");	1669	ERR ("'false' expected");
959		1670
960	break;	1671	break;
…		…
969	ERR ("'null' expected");	1680	ERR ("'null' expected");
970		1681
971	break;	1682	break;
972		1683
973	default:	1684	default:
974	ERR ("malformed JSON string, neither array, object, number, string or atom");	1685	ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
975	break;	1686	break;
976	}	1687	}
977		1688
978	fail:	1689	fail:
979	return 0;	1690	return 0;
980	}	1691	}
981		1692
982	static SV *	1693	static SV *
983	decode_json (SV *string, U32 flags)	1694	decode_json (SV *string, JSON *json, STRLEN *offset_return)
984	{	1695	{
985	dec_t dec;	1696	dec_t dec;
986	SV *sv;	1697	SV *sv;
987		1698
		1699	/* work around bugs in 5.10 where manipulating magic values
		1700	* makes perl ignore the magic in subsequent accesses.
		1701	* also make a copy of non-PV values, to get them into a clean
		1702	* state (SvPV should do that, but it's buggy, see below).
		1703	*
		1704	* SvIsCOW_shared_hash works around a bug in perl (possibly 5.16),
		1705	* as reported by Reini Urban.
		1706	*/
		1707	/*SvGETMAGIC (string);*/
		1708	if (SvMAGICAL (string) || !SvPOK (string) || SvIsCOW_shared_hash (string))
		1709	string = sv_2mortal (newSVsv (string));
		1710
988	SvUPGRADE (string, SVt_PV);	1711	SvUPGRADE (string, SVt_PV);
989		1712
990	if (flags & F_UTF8)	1713	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1714	* assertion with -DDEBUGGING, although SvCUR is documented to
		1715	* return the xpv_cur field which certainly exists after upgrading.
		1716	* according to nicholas clark, calling SvPOK fixes this.
		1717	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1718	* and hope for the best.
		1719	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1720	* assertion business is seriously broken, try yet another workaround
		1721	* for the broken -DDEBUGGING.
		1722	*/
		1723	{
		1724	#ifdef DEBUGGING
		1725	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1726	#else
		1727	STRLEN offset = SvCUR (string);
		1728	#endif
		1729
		1730	if (offset > json->max_size && json->max_size)
		1731	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1732	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1733	}
		1734
		1735	if (DECODE_WANTS_OCTETS (json))
991	sv_utf8_downgrade (string, 0);	1736	sv_utf8_downgrade (string, 0);
992	else	1737	else
993	sv_utf8_upgrade (string);	1738	sv_utf8_upgrade (string);
994		1739
995	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1740	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
996		1741
997	dec.flags = flags;	1742	dec.json = *json;
998	dec.cur = SvPVX (string);	1743	dec.cur = SvPVX (string);
999	dec.end = SvEND (string);	1744	dec.end = SvEND (string);
1000	dec.err = 0;	1745	dec.err = 0;
1001	dec.depth = 0;	1746	dec.depth = 0;
1002	dec.maxdepth = DEC_DEPTH (dec.flags);
1003		1747
		1748	if (dec.json.cb_object || dec.json.cb_sk_object)
		1749	dec.json.flags |= F_HOOK;
		1750
1004	*dec.end = 0; // this should basically be a nop, too, but make sure its there	1751	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1752
		1753	decode_ws (&dec);
1005	sv = decode_sv (&dec);	1754	sv = decode_sv (&dec);
1006		1755
		1756	if (offset_return)
		1757	*offset_return = dec.cur - SvPVX (string);
		1758	else if (sv)
		1759	{
		1760	// check for trailing garbage
		1761	decode_ws (&dec);
		1762
		1763	if (*dec.cur)
		1764	{
		1765	dec.err = "garbage after JSON object";
		1766	SvREFCNT_dec (sv);
		1767	sv = 0;
		1768	}
		1769	}
		1770
1007	if (!sv)	1771	if (!sv)
1008	{	1772	{
1009	IV offset = dec.flags & F_UTF8
1010	? dec.cur - SvPVX (string)
1011	: utf8_distance (dec.cur, SvPVX (string));
1012	SV *uni = sv_newmortal ();	1773	SV *uni = sv_newmortal ();
1013		1774
1014	// horrible hack to silence warning inside pv_uni_display	1775	// horrible hack to silence warning inside pv_uni_display
1015	COP cop = *PL_curcop;	1776	COP cop = *PL_curcop;
1016	cop.cop_warnings = pWARN_NONE;	1777	cop.cop_warnings = pWARN_NONE;
…		…
1018	SAVEVPTR (PL_curcop);	1779	SAVEVPTR (PL_curcop);
1019	PL_curcop = &cop;	1780	PL_curcop = &cop;
1020	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1781	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1021	LEAVE;	1782	LEAVE;
1022		1783
1023	croak ("%s, at character offset %d [\"%s\"]",	1784	croak ("%s, at character offset %d (before \"%s\")",
1024	dec.err,	1785	dec.err,
1025	(int)offset,	1786	(int)ptr_to_index (string, dec.cur),
1026	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1787	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
1027	}	1788	}
1028		1789
1029	sv = sv_2mortal (sv);	1790	sv = sv_2mortal (sv);
1030		1791
1031	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1792	if (!(dec.json.flags & F_ALLOW_NONREF) && json_nonref (sv))
1032	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1793	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1033		1794
1034	return sv;	1795	return sv;
		1796	}
		1797
		1798	/////////////////////////////////////////////////////////////////////////////
		1799	// incremental parser
		1800
		1801	static void
		1802	incr_parse (JSON *self)
		1803	{
		1804	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1805
		1806	// the state machine here is a bit convoluted and could be simplified a lot
		1807	// but this would make it slower, so...
		1808
		1809	for (;;)
		1810	{
		1811	//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
		1812	switch (self->incr_mode)
		1813	{
		1814	// only used for initial whitespace skipping
		1815	case INCR_M_WS:
		1816	for (;;)
		1817	{
		1818	if (*p > 0x20)
		1819	{
		1820	if (*p == '#')
		1821	{
		1822	self->incr_mode = INCR_M_C0;
		1823	goto incr_m_c;
		1824	}
		1825	else
		1826	{
		1827	self->incr_mode = INCR_M_JSON;
		1828	goto incr_m_json;
		1829	}
		1830	}
		1831	else if (!*p)
		1832	goto interrupt;
		1833
		1834	++p;
		1835	}
		1836
		1837	// skip a single char inside a string (for \\-processing)
		1838	case INCR_M_BS:
		1839	if (!*p)
		1840	goto interrupt;
		1841
		1842	++p;
		1843	self->incr_mode = INCR_M_STR;
		1844	goto incr_m_str;
		1845
		1846	// inside #-style comments
		1847	case INCR_M_C0:
		1848	case INCR_M_C1:
		1849	incr_m_c:
		1850	for (;;)
		1851	{
		1852	if (*p == '\n')
		1853	{
		1854	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1855	break;
		1856	}
		1857	else if (!*p)
		1858	goto interrupt;
		1859
		1860	++p;
		1861	}
		1862
		1863	break;
		1864
		1865	// inside a string
		1866	case INCR_M_STR:
		1867	incr_m_str:
		1868	for (;;)
		1869	{
		1870	if (*p == '"')
		1871	{
		1872	++p;
		1873	self->incr_mode = INCR_M_JSON;
		1874
		1875	if (!self->incr_nest)
		1876	goto interrupt;
		1877
		1878	goto incr_m_json;
		1879	}
		1880	else if (*p == '\\')
		1881	{
		1882	++p; // "virtually" consumes character after \
		1883
		1884	if (!*p) // if at end of string we have to switch modes
		1885	{
		1886	self->incr_mode = INCR_M_BS;
		1887	goto interrupt;
		1888	}
		1889	}
		1890	else if (!*p)
		1891	goto interrupt;
		1892
		1893	++p;
		1894	}
		1895
		1896	// after initial ws, outside string
		1897	case INCR_M_JSON:
		1898	incr_m_json:
		1899	for (;;)
		1900	{
		1901	switch (*p++)
		1902	{
		1903	case 0:
		1904	--p;
		1905	goto interrupt;
		1906
		1907	case 0x09:
		1908	case 0x0a:
		1909	case 0x0d:
		1910	case 0x20:
		1911	if (!self->incr_nest)
		1912	{
		1913	--p; // do not eat the whitespace, let the next round do it
		1914	goto interrupt;
		1915	}
		1916	break;
		1917
		1918	case '"':
		1919	self->incr_mode = INCR_M_STR;
		1920	goto incr_m_str;
		1921
		1922	case '[':
		1923	case '{':
		1924	case '(':
		1925	if (++self->incr_nest > self->max_depth)
		1926	croak (ERR_NESTING_EXCEEDED);
		1927	break;
		1928
		1929	case ']':
		1930	case '}':
		1931	if (--self->incr_nest <= 0)
		1932	goto interrupt;
		1933	break;
		1934
		1935	case ')':
		1936	--self->incr_nest;
		1937	break;
		1938
		1939	case '#':
		1940	self->incr_mode = INCR_M_C1;
		1941	goto incr_m_c;
		1942	}
		1943	}
		1944	}
		1945
		1946	modechange:
		1947	;
		1948	}
		1949
		1950	interrupt:
		1951	self->incr_pos = p - SvPVX (self->incr_text);
		1952	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1953	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
1035	}	1954	}
1036		1955
1037	/////////////////////////////////////////////////////////////////////////////	1956	/////////////////////////////////////////////////////////////////////////////
1038	// XS interface functions	1957	// XS interface functions
1039		1958
1040	MODULE = JSON::XS PACKAGE = JSON::XS	1959	MODULE = JSON::XS PACKAGE = JSON::XS
1041		1960
1042	BOOT:	1961	BOOT:
1043	{	1962	{
1044	int i;	1963	int i;
1045
1046	memset (decode_hexdigit, 0xff, 256);
1047		1964
1048	for (i = 0; i < 256; ++i)	1965	for (i = 0; i < 256; ++i)
1049	decode_hexdigit [i] =	1966	decode_hexdigit [i] =
1050	i >= '0' && i <= '9' ? i - '0'	1967	i >= '0' && i <= '9' ? i - '0'
1051	: i >= 'a' && i <= 'f' ? i - 'a' + 10	1968	: i >= 'a' && i <= 'f' ? i - 'a' + 10
1052	: i >= 'A' && i <= 'F' ? i - 'A' + 10	1969	: i >= 'A' && i <= 'F' ? i - 'A' + 10
1053	: -1;	1970	: -1;
1054		1971
1055	json_stash = gv_stashpv ("JSON::XS", 1);	1972	json_stash = gv_stashpv ("JSON::XS" , 1);
		1973	bool_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
		1974	bool_true = get_bool ("Types::Serialiser::true");
		1975	bool_false = get_bool ("Types::Serialiser::false");
		1976
		1977	sv_json = newSVpv ("JSON", 0);
		1978	SvREADONLY_on (sv_json);
		1979
		1980	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
1056	}	1981	}
1057		1982
1058	PROTOTYPES: DISABLE	1983	PROTOTYPES: DISABLE
1059		1984
1060	SV *new (char *dummy)	1985	void CLONE (...)
1061	CODE:	1986	CODE:
1062	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1987	json_stash = 0;
		1988	bool_stash = 0;
		1989
		1990	void new (char *klass)
		1991	PPCODE:
		1992	{
		1993	SV *pv = NEWSV (0, sizeof (JSON));
		1994	SvPOK_only (pv);
		1995	json_init ((JSON *)SvPVX (pv));
		1996	XPUSHs (sv_2mortal (sv_bless (
		1997	newRV_noinc (pv),
		1998	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1999	)));
		2000	}
		2001
		2002	void ascii (JSON *self, int enable = 1)
		2003	ALIAS:
		2004	ascii = F_ASCII
		2005	latin1 = F_LATIN1
		2006	utf8 = F_UTF8
		2007	indent = F_INDENT
		2008	canonical = F_CANONICAL
		2009	space_before = F_SPACE_BEFORE
		2010	space_after = F_SPACE_AFTER
		2011	pretty = F_PRETTY
		2012	allow_nonref = F_ALLOW_NONREF
		2013	shrink = F_SHRINK
		2014	allow_blessed = F_ALLOW_BLESSED
		2015	convert_blessed = F_CONV_BLESSED
		2016	relaxed = F_RELAXED
		2017	allow_unknown = F_ALLOW_UNKNOWN
		2018	allow_tags = F_ALLOW_TAGS
		2019	PPCODE:
		2020	{
		2021	if (enable)
		2022	self->flags |= ix;
		2023	else
		2024	self->flags &= ~ix;
		2025
		2026	XPUSHs (ST (0));
		2027	}
		2028
		2029	void get_ascii (JSON *self)
		2030	ALIAS:
		2031	get_ascii = F_ASCII
		2032	get_latin1 = F_LATIN1
		2033	get_utf8 = F_UTF8
		2034	get_indent = F_INDENT
		2035	get_canonical = F_CANONICAL
		2036	get_space_before = F_SPACE_BEFORE
		2037	get_space_after = F_SPACE_AFTER
		2038	get_allow_nonref = F_ALLOW_NONREF
		2039	get_shrink = F_SHRINK
		2040	get_allow_blessed = F_ALLOW_BLESSED
		2041	get_convert_blessed = F_CONV_BLESSED
		2042	get_relaxed = F_RELAXED
		2043	get_allow_unknown = F_ALLOW_UNKNOWN
		2044	get_allow_tags = F_ALLOW_TAGS
		2045	PPCODE:
		2046	XPUSHs (boolSV (self->flags & ix));
		2047
		2048	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		2049	PPCODE:
		2050	self->max_depth = max_depth;
		2051	XPUSHs (ST (0));
		2052
		2053	U32 get_max_depth (JSON *self)
		2054	CODE:
		2055	RETVAL = self->max_depth;
1063	OUTPUT:	2056	OUTPUT:
1064	RETVAL	2057	RETVAL
1065		2058
1066	SV *ascii (SV *self, int enable = 1)	2059	void max_size (JSON *self, U32 max_size = 0)
1067	ALIAS:	2060	PPCODE:
1068	ascii = F_ASCII	2061	self->max_size = max_size;
1069	utf8 = F_UTF8	2062	XPUSHs (ST (0));
1070	indent = F_INDENT	2063
1071	canonical = F_CANONICAL	2064	int get_max_size (JSON *self)
1072	space_before = F_SPACE_BEFORE
1073	space_after = F_SPACE_AFTER
1074	pretty = F_PRETTY
1075	allow_nonref = F_ALLOW_NONREF
1076	shrink = F_SHRINK
1077	CODE:	2065	CODE:
1078	{	2066	RETVAL = self->max_size;
1079	UV *uv = SvJSON (self);
1080	if (enable)
1081	*uv |= ix;
1082	else
1083	*uv &= ~ix;
1084
1085	RETVAL = newSVsv (self);
1086	}
1087	OUTPUT:	2067	OUTPUT:
1088	RETVAL	2068	RETVAL
1089		2069
1090	SV *max_depth (SV *self, UV max_depth = 0x80000000UL)	2070	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		2071	PPCODE:
		2072	{
		2073	SvREFCNT_dec (self->cb_object);
		2074	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		2075
		2076	XPUSHs (ST (0));
		2077	}
		2078
		2079	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		2080	PPCODE:
		2081	{
		2082	if (!self->cb_sk_object)
		2083	self->cb_sk_object = newHV ();
		2084
		2085	if (SvOK (cb))
		2086	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		2087	else
		2088	{
		2089	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		2090
		2091	if (!HvKEYS (self->cb_sk_object))
		2092	{
		2093	SvREFCNT_dec (self->cb_sk_object);
		2094	self->cb_sk_object = 0;
		2095	}
		2096	}
		2097
		2098	XPUSHs (ST (0));
		2099	}
		2100
		2101	void encode (JSON *self, SV *scalar)
		2102	PPCODE:
		2103	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		2104	XPUSHs (scalar);
		2105
		2106	void decode (JSON *self, SV *jsonstr)
		2107	PPCODE:
		2108	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		2109	XPUSHs (jsonstr);
		2110
		2111	void decode_prefix (JSON *self, SV *jsonstr)
		2112	PPCODE:
		2113	{
		2114	SV *sv;
		2115	STRLEN offset;
		2116	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		2117	EXTEND (SP, 2);
		2118	PUSHs (sv);
		2119	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, SvPV_nolen (jsonstr) + offset))));
		2120	}
		2121
		2122	void incr_parse (JSON *self, SV *jsonstr = 0)
		2123	PPCODE:
		2124	{
		2125	if (!self->incr_text)
		2126	self->incr_text = newSVpvn ("", 0);
		2127
		2128	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		2129	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		2130	if (DECODE_WANTS_OCTETS (self))
		2131	{
		2132	if (self->incr_pos)
		2133	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		2134	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		2135
		2136	sv_utf8_downgrade (self->incr_text, 0);
		2137	}
		2138	else
		2139	{
		2140	sv_utf8_upgrade (self->incr_text);
		2141
		2142	if (self->incr_pos)
		2143	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		2144	- (U8 *)SvPVX (self->incr_text);
		2145	}
		2146
		2147	// append data, if any
		2148	if (jsonstr)
		2149	{
		2150	/* make sure both strings have same encoding */
		2151	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		2152	if (SvUTF8 (jsonstr))
		2153	sv_utf8_downgrade (jsonstr, 0);
		2154	else
		2155	sv_utf8_upgrade (jsonstr);
		2156
		2157	/* and then just blindly append */
		2158	{
		2159	STRLEN len;
		2160	const char *str = SvPV (jsonstr, len);
		2161	STRLEN cur = SvCUR (self->incr_text);
		2162
		2163	if (SvLEN (self->incr_text) <= cur + len)
		2164	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		2165
		2166	Move (str, SvEND (self->incr_text), len, char);
		2167	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		2168	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		2169	}
		2170	}
		2171
		2172	if (GIMME_V != G_VOID)
		2173	do
		2174	{
		2175	SV *sv;
		2176	STRLEN offset;
		2177
		2178	if (!INCR_DONE (self))
		2179	{
		2180	incr_parse (self);
		2181
		2182	if (self->incr_pos > self->max_size && self->max_size)
		2183	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2184	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2185
		2186	if (!INCR_DONE (self))
		2187	{
		2188	// as an optimisation, do not accumulate white space in the incr buffer
		2189	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2190	{
		2191	self->incr_pos = 0;
		2192	SvCUR_set (self->incr_text, 0);
		2193	}
		2194
		2195	break;
		2196	}
		2197	}
		2198
		2199	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2200	XPUSHs (sv);
		2201
		2202	self->incr_pos -= offset;
		2203	self->incr_nest = 0;
		2204	self->incr_mode = 0;
		2205
		2206	sv_chop (self->incr_text, SvPVX (self->incr_text) + offset);
		2207	}
		2208	while (GIMME_V == G_ARRAY);
		2209	}
		2210
		2211	SV *incr_text (JSON *self)
		2212	ATTRS: lvalue
1091	CODE:	2213	CODE:
1092	{	2214	{
1093	UV *uv = SvJSON (self);	2215	if (self->incr_pos)
1094	UV log2 = 0;	2216	croak ("incr_text can not be called when the incremental parser already started parsing");
1095		2217
1096	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;	2218	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
1097
1098	while ((1UL << log2) < max_depth)
1099	++log2;
1100
1101	*uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1102
1103	RETVAL = newSVsv (self);
1104	}	2219	}
1105	OUTPUT:	2220	OUTPUT:
1106	RETVAL	2221	RETVAL
1107		2222
		2223	void incr_skip (JSON *self)
		2224	CODE:
		2225	{
		2226	if (self->incr_pos)
		2227	{
		2228	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2229	self->incr_pos = 0;
		2230	self->incr_nest = 0;
		2231	self->incr_mode = 0;
		2232	}
		2233	}
		2234
		2235	void incr_reset (JSON *self)
		2236	CODE:
		2237	{
		2238	SvREFCNT_dec (self->incr_text);
		2239	self->incr_text = 0;
		2240	self->incr_pos = 0;
		2241	self->incr_nest = 0;
		2242	self->incr_mode = 0;
		2243	}
		2244
		2245	void DESTROY (JSON *self)
		2246	CODE:
		2247	SvREFCNT_dec (self->cb_sk_object);
		2248	SvREFCNT_dec (self->cb_object);
		2249	SvREFCNT_dec (self->incr_text);
		2250
		2251	PROTOTYPES: ENABLE
		2252
1108	void encode (SV *self, SV *scalar)	2253	void encode_json (SV *scalar)
1109	PPCODE:	2254	PPCODE:
1110	XPUSHs (encode_json (scalar, *SvJSON (self)));	2255	{
		2256	JSON json;
		2257	json_init (&json);
		2258	json.flags |= F_UTF8;
		2259	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2260	XPUSHs (scalar);
		2261	}
1111		2262
1112	void decode (SV *self, SV *jsonstr)	2263	void decode_json (SV *jsonstr)
1113	PPCODE:	2264	PPCODE:
1114	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	2265	{
		2266	JSON json;
		2267	json_init (&json);
		2268	json.flags |= F_UTF8;
		2269	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2270	XPUSHs (jsonstr);
		2271	}
1115		2272
1116	PROTOTYPES: ENABLE
1117
1118	void to_json (SV *scalar)
1119	ALIAS:
1120	objToJson = 0
1121	PPCODE:
1122	XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
1123
1124	void from_json (SV *jsonstr)
1125	ALIAS:
1126	jsonToObj = 0
1127	PPCODE:
1128	XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8));
1129

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