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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 1.120 by root, Mon Oct 28 23:23:10 2013 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include <assert.h>
6	#include "string.h"	6	#include <string.h>
7	#include "stdlib.h"	7	#include <stdlib.h>
		8	#include <stdio.h>
		9	#include <limits.h>
		10	#include <float.h>
8		11
		12	#if defined(__BORLANDC__) || defined(_MSC_VER)
		13	# define snprintf _snprintf // C compilers have this in stdio.h
		14	#endif
		15
		16	// some old perls do not have this, try to make it work, no
		17	// guarantees, though. if it breaks, you get to keep the pieces.
		18	#ifndef UTF8_MAXBYTES
		19	# define UTF8_MAXBYTES 13
		20	#endif
		21
		22	// three extra for rounding, sign, and end of string
		23	#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
		24
9	#define F_ASCII 0x00000001	25	#define F_ASCII 0x00000001UL
		26	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	27	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	28	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	29	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	30	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	31	#define F_SPACE_AFTER 0x00000040UL
15	#define F_ALLOW_NONREF 0x00000080	32	#define F_ALLOW_NONREF 0x00000100UL
16	#define F_SHRINK 0x00000100	33	#define F_SHRINK 0x00000200UL
		34	#define F_ALLOW_BLESSED 0x00000400UL
		35	#define F_CONV_BLESSED 0x00000800UL
		36	#define F_RELAXED 0x00001000UL
		37	#define F_ALLOW_UNKNOWN 0x00002000UL
		38	#define F_ALLOW_TAGS 0x00004000UL
		39	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
17		40
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	41	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0
20		42
21	#define INIT_SIZE 32 // initial scalar size to be allocated	43	#define INIT_SIZE 32 // initial scalar size to be allocated
22	#define INDENT_STEP 3 // spaces per indentation level	44	#define INDENT_STEP 3 // spaces per indentation level
23		45
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	46	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
		47
		48	#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
26		49
27	#define SB do {	50	#define SB do {
28	#define SE } while (0)	51	#define SE } while (0)
29		52
		53	#if __GNUC__ >= 3
		54	# define expect(expr,value) __builtin_expect ((expr), (value))
		55	# define INLINE static inline
		56	#else
		57	# define expect(expr,value) (expr)
		58	# define INLINE static
		59	#endif
		60
		61	#define expect_false(expr) expect ((expr) != 0, 0)
		62	#define expect_true(expr) expect ((expr) != 0, 1)
		63
		64	#define IN_RANGE_INC(type,val,beg,end) \
		65	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		66	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		67
		68	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		69
		70	#ifdef USE_ITHREADS
		71	# define JSON_SLOW 1
		72	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		73	#else
		74	# define JSON_SLOW 0
		75	# define JSON_STASH json_stash
		76	#endif
		77
		78	// the amount of HEs to allocate on the stack, when sorting keys
		79	#define STACK_HES 64
		80
30	static HV *json_stash; // JSON::XS::	81	static HV *json_stash, *types_boolean_stash; // JSON::XS::
		82	static SV *types_true, *types_false, *sv_json;
		83
		84	enum {
		85	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		86	INCR_M_STR, // inside string
		87	INCR_M_BS, // inside backslash
		88	INCR_M_C0, // inside comment in initial whitespace sequence
		89	INCR_M_C1, // inside comment in other places
		90	INCR_M_JSON // outside anything, count nesting
		91	};
		92
		93	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		94
		95	typedef struct {
		96	U32 flags;
		97	U32 max_depth;
		98	STRLEN max_size;
		99
		100	SV *cb_object;
		101	HV *cb_sk_object;
		102
		103	// for the incremental parser
		104	SV *incr_text; // the source text so far
		105	STRLEN incr_pos; // the current offset into the text
		106	int incr_nest; // {[]}-nesting level
		107	unsigned char incr_mode;
		108	} JSON;
		109
		110	INLINE void
		111	json_init (JSON *json)
		112	{
		113	Zero (json, 1, JSON);
		114	json->max_depth = 512;
		115	}
31		116
32	/////////////////////////////////////////////////////////////////////////////	117	/////////////////////////////////////////////////////////////////////////////
33	// utility functions	118	// utility functions
34		119
35	static UV *	120	INLINE SV *
36	SvJSON (SV *sv)	121	get_bool (const char *name)
37	{	122	{
38	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))	123	SV *sv = get_sv (name, 1);
39	croak ("object is not of type JSON::XS");
40		124
41	return &SvUVX (SvRV (sv));	125	SvREADONLY_on (sv);
42	}	126	SvREADONLY_on (SvRV (sv));
43		127
44	static void	128	return sv;
		129	}
		130
		131	INLINE void
45	shrink (SV *sv)	132	shrink (SV *sv)
46	{	133	{
47	sv_utf8_downgrade (sv, 1);	134	sv_utf8_downgrade (sv, 1);
		135
48	if (SvLEN (sv) > SvCUR (sv) + 1)	136	if (SvLEN (sv) > SvCUR (sv) + 1)
49	{	137	{
50	#ifdef SvPV_shrink_to_cur	138	#ifdef SvPV_shrink_to_cur
51	SvPV_shrink_to_cur (sv);	139	SvPV_shrink_to_cur (sv);
52	#elif defined (SvPV_renew)	140	#elif defined (SvPV_renew)
53	SvPV_renew (sv, SvCUR (sv) + 1);	141	SvPV_renew (sv, SvCUR (sv) + 1);
54	#endif	142	#endif
55	}	143	}
56	}	144	}
57		145
		146	// decode an utf-8 character and return it, or (UV)-1 in
		147	// case of an error.
		148	// we special-case "safe" characters from U+80 .. U+7FF,
		149	// but use the very good perl function to parse anything else.
		150	// note that we never call this function for a ascii codepoints
		151	INLINE UV
		152	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		153	{
		154	if (expect_true (len >= 2
		155	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		156	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		157	{
		158	*clen = 2;
		159	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		160	}
		161	else
		162	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		163	}
		164
		165	// likewise for encoding, also never called for ascii codepoints
		166	// this function takes advantage of this fact, although current gccs
		167	// seem to optimise the check for >= 0x80 away anyways
		168	INLINE unsigned char *
		169	encode_utf8 (unsigned char *s, UV ch)
		170	{
		171	if (expect_false (ch < 0x000080))
		172	*s++ = ch;
		173	else if (expect_true (ch < 0x000800))
		174	*s++ = 0xc0 | ( ch >> 6),
		175	*s++ = 0x80 | ( ch & 0x3f);
		176	else if ( ch < 0x010000)
		177	*s++ = 0xe0 | ( ch >> 12),
		178	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		179	*s++ = 0x80 | ( ch & 0x3f);
		180	else if ( ch < 0x110000)
		181	*s++ = 0xf0 | ( ch >> 18),
		182	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		183	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		184	*s++ = 0x80 | ( ch & 0x3f);
		185
		186	return s;
		187	}
		188
		189	// convert offset pointer to character index, sv must be string
		190	static STRLEN
		191	ptr_to_index (SV *sv, char *offset)
		192	{
		193	return SvUTF8 (sv)
		194	? utf8_distance (offset, SvPVX (sv))
		195	: offset - SvPVX (sv);
		196	}
		197
		198	/////////////////////////////////////////////////////////////////////////////
		199	// fp hell
		200
		201	// scan a group of digits, and a trailing exponent
		202	static void
		203	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
		204	{
		205	UV uaccum = 0;
		206	int eaccum = 0;
		207
		208	// if we recurse too deep, skip all remaining digits
		209	// to avoid a stack overflow attack
		210	if (expect_false (--maxdepth <= 0))
		211	while (((U8)*s - '0') < 10)
		212	++s;
		213
		214	for (;;)
		215	{
		216	U8 dig = (U8)*s - '0';
		217
		218	if (expect_false (dig >= 10))
		219	{
		220	if (dig == (U8)((U8)'.' - (U8)'0'))
		221	{
		222	++s;
		223	json_atof_scan1 (s, accum, expo, 1, maxdepth);
		224	}
		225	else if ((dig | ' ') == 'e' - '0')
		226	{
		227	int exp2 = 0;
		228	int neg = 0;
		229
		230	++s;
		231
		232	if (*s == '-')
		233	{
		234	++s;
		235	neg = 1;
		236	}
		237	else if (*s == '+')
		238	++s;
		239
		240	while ((dig = (U8)*s - '0') < 10)
		241	exp2 = exp2 * 10 + *s++ - '0';
		242
		243	*expo += neg ? -exp2 : exp2;
		244	}
		245
		246	break;
		247	}
		248
		249	++s;
		250
		251	uaccum = uaccum * 10 + dig;
		252	++eaccum;
		253
		254	// if we have too many digits, then recurse for more
		255	// we actually do this for rather few digits
		256	if (uaccum >= (UV_MAX - 9) / 10)
		257	{
		258	if (postdp) *expo -= eaccum;
		259	json_atof_scan1 (s, accum, expo, postdp, maxdepth);
		260	if (postdp) *expo += eaccum;
		261
		262	break;
		263	}
		264	}
		265
		266	// this relies greatly on the quality of the pow ()
		267	// implementation of the platform, but a good
		268	// implementation is hard to beat.
		269	// (IEEE 754 conformant ones are required to be exact)
		270	if (postdp) *expo -= eaccum;
		271	*accum += uaccum * Perl_pow (10., *expo);
		272	*expo += eaccum;
		273	}
		274
		275	static NV
		276	json_atof (const char *s)
		277	{
		278	NV accum = 0.;
		279	int expo = 0;
		280	int neg = 0;
		281
		282	if (*s == '-')
		283	{
		284	++s;
		285	neg = 1;
		286	}
		287
		288	// a recursion depth of ten gives us >>500 bits
		289	json_atof_scan1 (s, &accum, &expo, 0, 10);
		290
		291	return neg ? -accum : accum;
		292	}
58	/////////////////////////////////////////////////////////////////////////////	293	/////////////////////////////////////////////////////////////////////////////
59	// encoder	294	// encoder
60		295
61	// structure used for encoding JSON	296	// structure used for encoding JSON
62	typedef struct	297	typedef struct
63	{	298	{
64	char *cur; // SvPVX (sv) + current output position	299	char *cur; // SvPVX (sv) + current output position
65	char *end; // SvEND (sv)	300	char *end; // SvEND (sv)
66	SV *sv; // result scalar	301	SV *sv; // result scalar
67	UV flags; // F_*	302	JSON json;
68	int indent; // indentation level	303	U32 indent; // indentation level
69	int max_depth; // max. recursion level	304	UV limit; // escape character values >= this value when encoding
70	} enc_t;	305	} enc_t;
71		306
72	static void	307	INLINE void
73	need (enc_t *enc, STRLEN len)	308	need (enc_t *enc, STRLEN len)
74	{	309	{
75	if (enc->cur + len >= enc->end)	310	if (expect_false (enc->cur + len >= enc->end))
76	{	311	{
77	STRLEN cur = enc->cur - SvPVX (enc->sv);	312	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
78	SvGROW (enc->sv, cur + len + 1);	313	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
79	enc->cur = SvPVX (enc->sv) + cur;	314	enc->cur = SvPVX (enc->sv) + cur;
80	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	315	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
81	}	316	}
82	}	317	}
83		318
84	static void	319	INLINE void
85	encode_ch (enc_t *enc, char ch)	320	encode_ch (enc_t *enc, char ch)
86	{	321	{
87	need (enc, 1);	322	need (enc, 1);
88	*enc->cur++ = ch;	323	*enc->cur++ = ch;
89	}	324	}
…		…
97		332
98	while (str < end)	333	while (str < end)
99	{	334	{
100	unsigned char ch = *(unsigned char *)str;	335	unsigned char ch = *(unsigned char *)str;
101		336
102	if (ch >= 0x20 && ch < 0x80) // most common case	337	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
103	{	338	{
104	if (ch == '"') // but with slow exceptions	339	if (expect_false (ch == '"')) // but with slow exceptions
105	{	340	{
106	need (enc, len += 1);	341	need (enc, len += 1);
107	*enc->cur++ = '\\';	342	*enc->cur++ = '\\';
108	*enc->cur++ = '"';	343	*enc->cur++ = '"';
109	}	344	}
110	else if (ch == '\\')	345	else if (expect_false (ch == '\\'))
111	{	346	{
112	need (enc, len += 1);	347	need (enc, len += 1);
113	*enc->cur++ = '\\';	348	*enc->cur++ = '\\';
114	*enc->cur++ = '\\';	349	*enc->cur++ = '\\';
115	}	350	}
…		…
133	STRLEN clen;	368	STRLEN clen;
134	UV uch;	369	UV uch;
135		370
136	if (is_utf8)	371	if (is_utf8)
137	{	372	{
138	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	373	uch = decode_utf8 (str, end - str, &clen);
139	if (clen == (STRLEN)-1)	374	if (clen == (STRLEN)-1)
140	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	375	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
141	}	376	}
142	else	377	else
143	{	378	{
144	uch = ch;	379	uch = ch;
145	clen = 1;	380	clen = 1;
146	}	381	}
147		382
148	if (uch > 0x10FFFFUL)	383	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	{	384	{
153	if (uch > 0xFFFFUL)	385	if (uch >= 0x10000UL)
154	{	386	{
		387	if (uch >= 0x110000UL)
		388	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		389
155	need (enc, len += 11);	390	need (enc, len += 11);
156	sprintf (enc->cur, "\\u%04x\\u%04x",	391	sprintf (enc->cur, "\\u%04x\\u%04x",
157	(int)((uch - 0x10000) / 0x400 + 0xD800),	392	(int)((uch - 0x10000) / 0x400 + 0xD800),
158	(int)((uch - 0x10000) % 0x400 + 0xDC00));	393	(int)((uch - 0x10000) % 0x400 + 0xDC00));
159	enc->cur += 12;	394	enc->cur += 12;
160	}	395	}
161	else	396	else
162	{	397	{
163	static char hexdigit [16] = "0123456789abcdef";
164	need (enc, len += 5);	398	need (enc, len += 5);
165	*enc->cur++ = '\\';	399	*enc->cur++ = '\\';
166	*enc->cur++ = 'u';	400	*enc->cur++ = 'u';
167	*enc->cur++ = hexdigit [ uch >> 12 ];	401	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
168	*enc->cur++ = hexdigit [(uch >> 8) & 15];	402	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
169	*enc->cur++ = hexdigit [(uch >> 4) & 15];	403	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
170	*enc->cur++ = hexdigit [(uch >> 0) & 15];	404	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
171	}	405	}
172		406
		407	str += clen;
		408	}
		409	else if (enc->json.flags & F_LATIN1)
		410	{
		411	*enc->cur++ = uch;
173	str += clen;	412	str += clen;
174	}	413	}
175	else if (is_utf8)	414	else if (is_utf8)
176	{	415	{
177	need (enc, len += clen);	416	need (enc, len += clen);
…		…
181	}	420	}
182	while (--clen);	421	while (--clen);
183	}	422	}
184	else	423	else
185	{	424	{
186	need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed	425	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
187	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	426	enc->cur = encode_utf8 (enc->cur, uch);
188	++str;	427	++str;
189	}	428	}
190	}	429	}
191	}	430	}
192	}	431	}
193		432
194	--len;	433	--len;
195	}	434	}
196	}	435	}
197		436
198	static void	437	INLINE void
199	encode_indent (enc_t *enc)	438	encode_indent (enc_t *enc)
200	{	439	{
201	if (enc->flags & F_INDENT)	440	if (enc->json.flags & F_INDENT)
202	{	441	{
203	int spaces = enc->indent * INDENT_STEP;	442	int spaces = enc->indent * INDENT_STEP;
204		443
205	need (enc, spaces);	444	need (enc, spaces);
206	memset (enc->cur, ' ', spaces);	445	memset (enc->cur, ' ', spaces);
207	enc->cur += spaces;	446	enc->cur += spaces;
208	}	447	}
209	}	448	}
210		449
211	static void	450	INLINE void
212	encode_space (enc_t *enc)	451	encode_space (enc_t *enc)
213	{	452	{
214	need (enc, 1);	453	need (enc, 1);
215	encode_ch (enc, ' ');	454	encode_ch (enc, ' ');
216	}	455	}
217		456
218	static void	457	INLINE void
219	encode_nl (enc_t *enc)	458	encode_nl (enc_t *enc)
220	{	459	{
221	if (enc->flags & F_INDENT)	460	if (enc->json.flags & F_INDENT)
222	{	461	{
223	need (enc, 1);	462	need (enc, 1);
224	encode_ch (enc, '\n');	463	encode_ch (enc, '\n');
225	}	464	}
226	}	465	}
227		466
228	static void	467	INLINE void
229	encode_comma (enc_t *enc)	468	encode_comma (enc_t *enc)
230	{	469	{
231	encode_ch (enc, ',');	470	encode_ch (enc, ',');
232		471
233	if (enc->flags & F_INDENT)	472	if (enc->json.flags & F_INDENT)
234	encode_nl (enc);	473	encode_nl (enc);
235	else if (enc->flags & F_SPACE_AFTER)	474	else if (enc->json.flags & F_SPACE_AFTER)
236	encode_space (enc);	475	encode_space (enc);
237	}	476	}
238		477
239	static void encode_sv (enc_t *enc, SV *sv);	478	static void encode_sv (enc_t *enc, SV *sv);
240		479
241	static void	480	static void
242	encode_av (enc_t *enc, AV *av)	481	encode_av (enc_t *enc, AV *av)
243	{	482	{
244	int i, len = av_len (av);	483	int i, len = av_len (av);
245		484
246	encode_ch (enc, '['); encode_nl (enc);	485	if (enc->indent >= enc->json.max_depth)
247	++enc->indent;	486	croak (ERR_NESTING_EXCEEDED);
248		487
		488	encode_ch (enc, '[');
		489
		490	if (len >= 0)
		491	{
		492	encode_nl (enc); ++enc->indent;
		493
249	for (i = 0; i <= len; ++i)	494	for (i = 0; i <= len; ++i)
250	{	495	{
		496	SV **svp = av_fetch (av, i, 0);
		497
251	encode_indent (enc);	498	encode_indent (enc);
252	encode_sv (enc, *av_fetch (av, i, 0));
253		499
		500	if (svp)
		501	encode_sv (enc, *svp);
		502	else
		503	encode_str (enc, "null", 4, 0);
		504
254	if (i < len)	505	if (i < len)
255	encode_comma (enc);	506	encode_comma (enc);
256	}	507	}
257		508
		509	encode_nl (enc); --enc->indent; encode_indent (enc);
		510	}
		511
258	encode_nl (enc);	512	encode_ch (enc, ']');
259
260	--enc->indent;
261	encode_indent (enc); encode_ch (enc, ']');
262	}	513	}
263		514
264	static void	515	static void
265	encode_he (enc_t *enc, HE *he)	516	encode_hk (enc_t *enc, HE *he)
266	{	517	{
267	encode_ch (enc, '"');	518	encode_ch (enc, '"');
268		519
269	if (HeKLEN (he) == HEf_SVKEY)	520	if (HeKLEN (he) == HEf_SVKEY)
270	{	521	{
271	SV *sv = HeSVKEY (he);	522	SV *sv = HeSVKEY (he);
272	STRLEN len;	523	STRLEN len;
273	char *str;	524	char *str;
274		525
275	SvGETMAGIC (sv);	526	SvGETMAGIC (sv);
276	str = SvPV (sv, len);	527	str = SvPV (sv, len);
277		528
278	encode_str (enc, str, len, SvUTF8 (sv));	529	encode_str (enc, str, len, SvUTF8 (sv));
279	}	530	}
280	else	531	else
281	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	532	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
282		533
283	encode_ch (enc, '"');	534	encode_ch (enc, '"');
284		535
285	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	536	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
286	encode_ch (enc, ':');	537	encode_ch (enc, ':');
287	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	538	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
288	encode_sv (enc, HeVAL (he));
289	}	539	}
290		540
291	// compare hash entries, used when all keys are bytestrings	541	// compare hash entries, used when all keys are bytestrings
292	static int	542	static int
293	he_cmp_fast (const void *a_, const void *b_)	543	he_cmp_fast (const void *a_, const void *b_)
…		…
298	HE *b = *(HE **)b_;	548	HE *b = *(HE **)b_;
299		549
300	STRLEN la = HeKLEN (a);	550	STRLEN la = HeKLEN (a);
301	STRLEN lb = HeKLEN (b);	551	STRLEN lb = HeKLEN (b);
302		552
303	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	553	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
304	cmp = la - lb;	554	cmp = lb - la;
305		555
306	return cmp;	556	return cmp;
307	}	557	}
308		558
309	// compare hash entries, used when some keys are sv's or utf-x	559	// compare hash entries, used when some keys are sv's or utf-x
310	static int	560	static int
311	he_cmp_slow (const void *a, const void *b)	561	he_cmp_slow (const void *a, const void *b)
312	{	562	{
313	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	563	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
314	}	564	}
315		565
316	static void	566	static void
317	encode_hv (enc_t *enc, HV *hv)	567	encode_hv (enc_t *enc, HV *hv)
318	{	568	{
319	int count, i;	569	HE *he;
320		570
321	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	571	if (enc->indent >= enc->json.max_depth)
		572	croak (ERR_NESTING_EXCEEDED);
322		573
323	if ((count = hv_iterinit (hv)))	574	encode_ch (enc, '{');
324	{	575
325	// for canonical output we have to sort by keys first	576	// for canonical output we have to sort by keys first
326	// actually, this is mostly due to the stupid so-called	577	// actually, this is mostly due to the stupid so-called
327	// security workaround added somewhere in 5.8.x.	578	// security workaround added somewhere in 5.8.x
328	// that randomises hash orderings	579	// that randomises hash orderings
329	if (enc->flags & F_CANONICAL)	580	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		581	{
		582	int count = hv_iterinit (hv);
		583
		584	if (SvMAGICAL (hv))
330	{	585	{
331	HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode	586	// need to count by iterating. could improve by dynamically building the vector below
		587	// but I don't care for the speed of this special case.
		588	// note also that we will run into undefined behaviour when the two iterations
		589	// do not result in the same count, something I might care for in some later release.
		590
		591	count = 0;
		592	while (hv_iternext (hv))
		593	++count;
		594
		595	hv_iterinit (hv);
		596	}
		597
		598	if (count)
		599	{
332	int fast = 1;	600	int i, fast = 1;
		601	HE *hes_stack [STACK_HES];
		602	HE **hes = hes_stack;
		603
		604	// allocate larger arrays on the heap
		605	if (count > STACK_HES)
		606	{
		607	SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
		608	hes = (HE **)SvPVX (sv);
		609	}
333		610
334	i = 0;	611	i = 0;
335	while ((he = hv_iternext (hv)))	612	while ((he = hv_iternext (hv)))
336	{	613	{
337	hes [i++] = he;	614	hes [i++] = he;
…		…
359		636
360	FREETMPS;	637	FREETMPS;
361	LEAVE;	638	LEAVE;
362	}	639	}
363		640
364	for (i = 0; i < count; ++i)	641	encode_nl (enc); ++enc->indent;
		642
		643	while (count--)
365	{	644	{
366	encode_indent (enc);	645	encode_indent (enc);
		646	he = hes [count];
367	encode_he (enc, hes [i]);	647	encode_hk (enc, he);
		648	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
368		649
369	if (i < count - 1)	650	if (count)
370	encode_comma (enc);	651	encode_comma (enc);
371	}	652	}
372		653
373	encode_nl (enc);	654	encode_nl (enc); --enc->indent; encode_indent (enc);
374	}	655	}
		656	}
		657	else
		658	{
		659	if (hv_iterinit (hv) || SvMAGICAL (hv))
		660	if ((he = hv_iternext (hv)))
		661	{
		662	encode_nl (enc); ++enc->indent;
		663
		664	for (;;)
		665	{
		666	encode_indent (enc);
		667	encode_hk (enc, he);
		668	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		669
		670	if (!(he = hv_iternext (hv)))
		671	break;
		672
		673	encode_comma (enc);
		674	}
		675
		676	encode_nl (enc); --enc->indent; encode_indent (enc);
		677	}
		678	}
		679
		680	encode_ch (enc, '}');
		681	}
		682
		683	// encode objects, arrays and special \0=false and \1=true values.
		684	static void
		685	encode_rv (enc_t *enc, SV *sv)
		686	{
		687	svtype svt;
		688	GV *method;
		689
		690	SvGETMAGIC (sv);
		691	svt = SvTYPE (sv);
		692
		693	if (expect_false (SvOBJECT (sv)))
		694	{
		695	HV *boolean_stash = !JSON_SLOW || types_boolean_stash
		696	? types_boolean_stash
		697	: gv_stashpv ("Types::Serialiser::Boolean", 1);
		698	HV *stash = SvSTASH (sv);
		699
		700	if (stash == boolean_stash)
		701	{
		702	if (SvIV (sv))
		703	encode_str (enc, "true", 4, 0);
		704	else
		705	encode_str (enc, "false", 5, 0);
		706	}
		707	else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
		708	{
		709	int count;
		710	dSP;
		711
		712	ENTER; SAVETMPS; PUSHMARK (SP);
		713	EXTEND (SP, 2);
		714	// we re-bless the reference to get overload and other niceties right
		715	PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		716	PUSHs (sv_json);
		717
		718	PUTBACK;
		719	count = call_sv ((SV *)GvCV (method), G_ARRAY);
		720	SPAGAIN;
		721
		722	// catch this surprisingly common error
		723	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		724	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		725
		726	encode_ch (enc, '(');
		727	encode_ch (enc, '"');
		728	encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
		729	encode_ch (enc, '"');
		730	encode_ch (enc, ')');
		731	encode_ch (enc, '[');
		732
		733	while (count)
		734	{
		735	encode_sv (enc, SP[1 - count--]);
		736
		737	if (count)
		738	encode_ch (enc, ',');
		739	}
		740
		741	encode_ch (enc, ']');
		742
		743	PUTBACK;
		744
		745	FREETMPS; LEAVE;
		746	}
		747	else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
		748	{
		749	dSP;
		750
		751	ENTER; SAVETMPS; PUSHMARK (SP);
		752	// we re-bless the reference to get overload and other niceties right
		753	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
		754
		755	// calling with G_SCALAR ensures that we always get a 1 return value
		756	PUTBACK;
		757	call_sv ((SV *)GvCV (method), G_SCALAR);
		758	SPAGAIN;
		759
		760	// catch this surprisingly common error
		761	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		762	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		763
		764	sv = POPs;
		765	PUTBACK;
		766
		767	encode_sv (enc, sv);
		768
		769	FREETMPS; LEAVE;
		770	}
		771	else if (enc->json.flags & F_ALLOW_BLESSED)
		772	encode_str (enc, "null", 4, 0);
375	else	773	else
376	{	774	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;	775	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
378	HE *he = hv_iternext (hv);	776	}
379		777	else if (svt == SVt_PVHV)
380	for (;;)	778	encode_hv (enc, (HV *)sv);
381	{	779	else if (svt == SVt_PVAV)
382	encode_indent (enc);	780	encode_av (enc, (AV *)sv);
383	encode_he (enc, he);	781	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	}	782	{
		783	STRLEN len = 0;
		784	char *pv = svt ? SvPV (sv, len) : 0;
394		785
395	--enc->indent; encode_indent (enc); encode_ch (enc, '}');	786	if (len == 1 && *pv == '1')
		787	encode_str (enc, "true", 4, 0);
		788	else if (len == 1 && *pv == '0')
		789	encode_str (enc, "false", 5, 0);
		790	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		791	encode_str (enc, "null", 4, 0);
		792	else
		793	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		794	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		795	}
		796	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		797	encode_str (enc, "null", 4, 0);
		798	else
		799	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		800	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
396	}	801	}
397		802
398	static void	803	static void
399	encode_sv (enc_t *enc, SV *sv)	804	encode_sv (enc_t *enc, SV *sv)
400	{	805	{
…		…
408	encode_str (enc, str, len, SvUTF8 (sv));	813	encode_str (enc, str, len, SvUTF8 (sv));
409	encode_ch (enc, '"');	814	encode_ch (enc, '"');
410	}	815	}
411	else if (SvNOKp (sv))	816	else if (SvNOKp (sv))
412	{	817	{
		818	// trust that perl will do the right thing w.r.t. JSON syntax.
413	need (enc, NV_DIG + 32);	819	need (enc, NV_DIG + 32);
414	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	820	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
415	enc->cur += strlen (enc->cur);	821	enc->cur += strlen (enc->cur);
416	}	822	}
417	else if (SvIOKp (sv))	823	else if (SvIOKp (sv))
418	{	824	{
		825	// we assume we can always read an IV as a UV and vice versa
		826	// we assume two's complement
		827	// we assume no aliasing issues in the union
		828	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		829	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		830	{
		831	// optimise the "small number case"
		832	// code will likely be branchless and use only a single multiplication
		833	// works for numbers up to 59074
		834	I32 i = SvIVX (sv);
		835	U32 u;
		836	char digit, nz = 0;
		837
419	need (enc, 64);	838	need (enc, 6);
		839
		840	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		841	u = i < 0 ? -i : i;
		842
		843	// convert to 4.28 fixed-point representation
		844	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		845
		846	// now output digit by digit, each time masking out the integer part
		847	// and multiplying by 5 while moving the decimal point one to the right,
		848	// resulting in a net multiplication by 10.
		849	// we always write the digit to memory but conditionally increment
		850	// the pointer, to enable the use of conditional move instructions.
		851	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		852	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		853	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		854	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		855	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		856	}
		857	else
		858	{
		859	// large integer, use the (rather slow) snprintf way.
		860	need (enc, IVUV_MAXCHARS);
420	enc->cur +=	861	enc->cur +=
421	SvIsUV(sv)	862	SvIsUV(sv)
422	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	863	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
423	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	864	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		865	}
424	}	866	}
425	else if (SvROK (sv))	867	else if (SvROK (sv))
426	{	868	encode_rv (enc, SvRV (sv));
427	SV *rv = SvRV (sv);	869	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);	870	encode_str (enc, "null", 4, 0);
444	else	871	else
445	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	872	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
446	SvPV_nolen (sv), SvFLAGS (sv));	873	SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
447	}	874	}
448		875
449	static SV *	876	static SV *
450	encode_json (SV *scalar, UV flags)	877	encode_json (SV *scalar, JSON *json)
451	{	878	{
		879	enc_t enc;
		880
452	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	881	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
453	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	882	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
454		883
455	enc_t enc;	884	enc.json = *json;
456	enc.flags = flags;
457	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	885	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
458	enc.cur = SvPVX (enc.sv);	886	enc.cur = SvPVX (enc.sv);
459	enc.end = SvEND (enc.sv);	887	enc.end = SvEND (enc.sv);
460	enc.indent = 0;	888	enc.indent = 0;
461	enc.max_depth = 0x7fffffffUL;	889	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		890	: enc.json.flags & F_LATIN1 ? 0x000100UL
		891	: 0x110000UL;
462		892
463	SvPOK_only (enc.sv);	893	SvPOK_only (enc.sv);
464	encode_sv (&enc, scalar);	894	encode_sv (&enc, scalar);
		895	encode_nl (&enc);
465		896
		897	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		898	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		899
466	if (!(flags & (F_ASCII | F_UTF8)))	900	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
467	SvUTF8_on (enc.sv);	901	SvUTF8_on (enc.sv);
468		902
469	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
470
471	if (enc.flags & F_SHRINK)	903	if (enc.json.flags & F_SHRINK)
472	shrink (enc.sv);	904	shrink (enc.sv);
473		905
474	return enc.sv;	906	return enc.sv;
475	}	907	}
476		908
…		…
481	typedef struct	913	typedef struct
482	{	914	{
483	char *cur; // current parser pointer	915	char *cur; // current parser pointer
484	char *end; // end of input string	916	char *end; // end of input string
485	const char *err; // parse error, if != 0	917	const char *err; // parse error, if != 0
486	UV flags; // F_*	918	JSON json;
		919	U32 depth; // recursion depth
		920	U32 maxdepth; // recursion depth limit
487	} dec_t;	921	} dec_t;
488		922
489	static void	923	INLINE void
		924	decode_comment (dec_t *dec)
		925	{
		926	// only '#'-style comments allowed a.t.m.
		927
		928	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		929	++dec->cur;
		930	}
		931
		932	INLINE void
490	decode_ws (dec_t *dec)	933	decode_ws (dec_t *dec)
491	{	934	{
492	for (;;)	935	for (;;)
493	{	936	{
494	char ch = *dec->cur;	937	char ch = *dec->cur;
495		938
496	if (ch > 0x20	939	if (ch > 0x20)
		940	{
		941	if (expect_false (ch == '#'))
		942	{
		943	if (dec->json.flags & F_RELAXED)
		944	decode_comment (dec);
		945	else
		946	break;
		947	}
		948	else
		949	break;
		950	}
497	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	951	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
498	break;	952	break; // parse error, but let higher level handle it, gives better error messages
499		953
500	++dec->cur;	954	++dec->cur;
501	}	955	}
502	}	956	}
503		957
504	#define ERR(reason) SB dec->err = reason; goto fail; SE	958	#define ERR(reason) SB dec->err = reason; goto fail; SE
		959
505	#define EXPECT_CH(ch) SB \	960	#define EXPECT_CH(ch) SB \
506	if (*dec->cur != ch) \	961	if (*dec->cur != ch) \
507	ERR (# ch " expected"); \	962	ERR (# ch " expected"); \
508	++dec->cur; \	963	++dec->cur; \
509	SE	964	SE
510		965
		966	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		967	#define DEC_DEC_DEPTH --dec->depth
		968
511	static SV *decode_sv (dec_t *dec);	969	static SV *decode_sv (dec_t *dec);
512		970
513	static signed char decode_hexdigit[256];	971	static signed char decode_hexdigit[256];
514		972
515	static UV	973	static UV
516	decode_4hex (dec_t *dec)	974	decode_4hex (dec_t *dec)
517	{	975	{
518	signed char d1, d2, d3, d4;	976	signed char d1, d2, d3, d4;
519	unsigned char *cur = (unsigned char *)dec->cur;	977	unsigned char *cur = (unsigned char *)dec->cur;
520		978
521	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	979	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");	980	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");	981	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");	982	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
525		983
526	dec->cur += 4;	984	dec->cur += 4;
527		985
528	return ((UV)d1) << 12	986	return ((UV)d1) << 12
529	| ((UV)d2) << 8	987	| ((UV)d2) << 8
…		…
537	static SV *	995	static SV *
538	decode_str (dec_t *dec)	996	decode_str (dec_t *dec)
539	{	997	{
540	SV *sv = 0;	998	SV *sv = 0;
541	int utf8 = 0;	999	int utf8 = 0;
		1000	char *dec_cur = dec->cur;
542		1001
543	do	1002	do
544	{	1003	{
545	char buf [SHORT_STRING_LEN + UTF8_MAX_LEN];	1004	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
546	char *cur = buf;	1005	char *cur = buf;
547		1006
548	do	1007	do
549	{	1008	{
550	unsigned char ch = *(unsigned char *)dec->cur++;	1009	unsigned char ch = *(unsigned char *)dec_cur++;
551		1010
552	if (ch == '"')	1011	if (expect_false (ch == '"'))
553	{	1012	{
554	--dec->cur;	1013	--dec_cur;
555	break;	1014	break;
556	}	1015	}
557	else if (ch == '\\')	1016	else if (expect_false (ch == '\\'))
558	{	1017	{
559	switch (*dec->cur)	1018	switch (*dec_cur)
560	{	1019	{
561	case '\\':	1020	case '\\':
562	case '/':	1021	case '/':
563	case '"': *cur++ = *dec->cur++; break;	1022	case '"': *cur++ = *dec_cur++; break;
564		1023
565	case 'b': ++dec->cur; *cur++ = '\010'; break;	1024	case 'b': ++dec_cur; *cur++ = '\010'; break;
566	case 't': ++dec->cur; *cur++ = '\011'; break;	1025	case 't': ++dec_cur; *cur++ = '\011'; break;
567	case 'n': ++dec->cur; *cur++ = '\012'; break;	1026	case 'n': ++dec_cur; *cur++ = '\012'; break;
568	case 'f': ++dec->cur; *cur++ = '\014'; break;	1027	case 'f': ++dec_cur; *cur++ = '\014'; break;
569	case 'r': ++dec->cur; *cur++ = '\015'; break;	1028	case 'r': ++dec_cur; *cur++ = '\015'; break;
570		1029
571	case 'u':	1030	case 'u':
572	{	1031	{
573	UV lo, hi;	1032	UV lo, hi;
574	++dec->cur;	1033	++dec_cur;
575		1034
		1035	dec->cur = dec_cur;
576	hi = decode_4hex (dec);	1036	hi = decode_4hex (dec);
		1037	dec_cur = dec->cur;
577	if (hi == (UV)-1)	1038	if (hi == (UV)-1)
578	goto fail;	1039	goto fail;
579		1040
580	// possibly a surrogate pair	1041	// possibly a surrogate pair
581	if (hi >= 0xd800)	1042	if (hi >= 0xd800)
582	if (hi < 0xdc00)	1043	if (hi < 0xdc00)
583	{	1044	{
584	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	1045	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
585	ERR ("missing low surrogate character in surrogate pair");	1046	ERR ("missing low surrogate character in surrogate pair");
586		1047
587	dec->cur += 2;	1048	dec_cur += 2;
588		1049
		1050	dec->cur = dec_cur;
589	lo = decode_4hex (dec);	1051	lo = decode_4hex (dec);
		1052	dec_cur = dec->cur;
590	if (lo == (UV)-1)	1053	if (lo == (UV)-1)
591	goto fail;	1054	goto fail;
592		1055
593	if (lo < 0xdc00 || lo >= 0xe000)	1056	if (lo < 0xdc00 || lo >= 0xe000)
594	ERR ("surrogate pair expected");	1057	ERR ("surrogate pair expected");
…		…
600		1063
601	if (hi >= 0x80)	1064	if (hi >= 0x80)
602	{	1065	{
603	utf8 = 1;	1066	utf8 = 1;
604		1067
605	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);	1068	cur = encode_utf8 (cur, hi);
606	}	1069	}
607	else	1070	else
608	*cur++ = hi;	1071	*cur++ = hi;
609	}	1072	}
610	break;	1073	break;
611		1074
612	default:	1075	default:
613	--dec->cur;	1076	--dec_cur;
614	ERR ("illegal backslash escape sequence in string");	1077	ERR ("illegal backslash escape sequence in string");
615	}	1078	}
616	}	1079	}
617	else if (ch >= 0x20 && ch <= 0x7f)	1080	else if (expect_true (ch >= 0x20 && ch < 0x80))
618	*cur++ = ch;	1081	*cur++ = ch;
619	else if (ch >= 0x80)	1082	else if (ch >= 0x80)
620	{	1083	{
621	--dec->cur;
622
623	STRLEN clen;	1084	STRLEN clen;
624	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	1085
		1086	--dec_cur;
		1087
		1088	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
625	if (clen == (STRLEN)-1)	1089	if (clen == (STRLEN)-1)
626	ERR ("malformed UTF-8 character in JSON string");	1090	ERR ("malformed UTF-8 character in JSON string");
627		1091
628	do	1092	do
629	{
630	*cur++ = *dec->cur++;	1093	*cur++ = *dec_cur++;
631	}
632	while (--clen);	1094	while (--clen);
633		1095
634	utf8 = 1;	1096	utf8 = 1;
635	}	1097	}
636	else if (!ch)
637	ERR ("unexpected end of string while parsing json string");
638	else	1098	else
		1099	{
		1100	--dec_cur;
		1101
		1102	if (!ch)
		1103	ERR ("unexpected end of string while parsing JSON string");
		1104	else
639	ERR ("invalid character encountered");	1105	ERR ("invalid character encountered while parsing JSON string");
640		1106	}
641	}	1107	}
642	while (cur < buf + SHORT_STRING_LEN);	1108	while (cur < buf + SHORT_STRING_LEN);
643		1109
		1110	{
644	STRLEN len = cur - buf;	1111	STRLEN len = cur - buf;
645		1112
646	if (sv)	1113	if (sv)
647	{	1114	{
648	SvGROW (sv, SvCUR (sv) + len + 1);	1115	STRLEN cur = SvCUR (sv);
		1116
		1117	if (SvLEN (sv) <= cur + len)
		1118	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1119
649	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	1120	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
650	SvCUR_set (sv, SvCUR (sv) + len);	1121	SvCUR_set (sv, SvCUR (sv) + len);
651	}	1122	}
652	else	1123	else
653	sv = newSVpvn (buf, len);	1124	sv = newSVpvn (buf, len);
654	}	1125	}
		1126	}
655	while (*dec->cur != '"');	1127	while (*dec_cur != '"');
656		1128
657	++dec->cur;	1129	++dec_cur;
658		1130
659	if (sv)	1131	if (sv)
660	{	1132	{
661	SvPOK_only (sv);	1133	SvPOK_only (sv);
662	*SvEND (sv) = 0;	1134	*SvEND (sv) = 0;
…		…
665	SvUTF8_on (sv);	1137	SvUTF8_on (sv);
666	}	1138	}
667	else	1139	else
668	sv = newSVpvn ("", 0);	1140	sv = newSVpvn ("", 0);
669		1141
		1142	dec->cur = dec_cur;
670	return sv;	1143	return sv;
671		1144
672	fail:	1145	fail:
		1146	dec->cur = dec_cur;
673	return 0;	1147	return 0;
674	}	1148	}
675		1149
676	static SV *	1150	static SV *
677	decode_num (dec_t *dec)	1151	decode_num (dec_t *dec)
…		…
735	is_nv = 1;	1209	is_nv = 1;
736	}	1210	}
737		1211
738	if (!is_nv)	1212	if (!is_nv)
739	{	1213	{
740	UV uv;	1214	int len = dec->cur - start;
741	int numtype = grok_number (start, dec->cur - start, &uv);	1215
742	if (numtype & IS_NUMBER_IN_UV)	1216	// special case the rather common 1..5-digit-int case
743	if (numtype & IS_NUMBER_NEG)	1217	if (*start == '-')
		1218	switch (len)
744	{	1219	{
745	if (uv < (UV)IV_MIN)	1220	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
746	return newSViv (-(IV)uv);	1221	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1222	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1223	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1224	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
747	}	1225	}
		1226	else
		1227	switch (len)
		1228	{
		1229	case 1: return newSViv ( start [0] - '0' * 1);
		1230	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1231	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1232	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1233	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1234	}
		1235
		1236	{
		1237	UV uv;
		1238	int numtype = grok_number (start, len, &uv);
		1239	if (numtype & IS_NUMBER_IN_UV)
		1240	if (numtype & IS_NUMBER_NEG)
		1241	{
		1242	if (uv < (UV)IV_MIN)
		1243	return newSViv (-(IV)uv);
		1244	}
748	else	1245	else
749	return newSVuv (uv);	1246	return newSVuv (uv);
750	}	1247	}
751		1248
		1249	len -= *start == '-' ? 1 : 0;
		1250
		1251	// does not fit into IV or UV, try NV
		1252	if (len <= NV_DIG)
		1253	// fits into NV without loss of precision
		1254	return newSVnv (json_atof (start));
		1255
		1256	// everything else fails, convert it to a string
		1257	return newSVpvn (start, dec->cur - start);
		1258	}
		1259
		1260	// loss of precision here
752	return newSVnv (Atof (start));	1261	return newSVnv (json_atof (start));
753		1262
754	fail:	1263	fail:
755	return 0;	1264	return 0;
756	}	1265	}
757		1266
758	static SV *	1267	static SV *
759	decode_av (dec_t *dec)	1268	decode_av (dec_t *dec)
760	{	1269	{
761	AV *av = newAV ();	1270	AV *av = newAV ();
762		1271
		1272	DEC_INC_DEPTH;
763	decode_ws (dec);	1273	decode_ws (dec);
		1274
764	if (*dec->cur == ']')	1275	if (*dec->cur == ']')
765	++dec->cur;	1276	++dec->cur;
766	else	1277	else
767	for (;;)	1278	for (;;)
768	{	1279	{
…		…
779	if (*dec->cur == ']')	1290	if (*dec->cur == ']')
780	{	1291	{
781	++dec->cur;	1292	++dec->cur;
782	break;	1293	break;
783	}	1294	}
784		1295
785	if (*dec->cur != ',')	1296	if (*dec->cur != ',')
786	ERR (", or ] expected while parsing array");	1297	ERR (", or ] expected while parsing array");
787		1298
788	++dec->cur;	1299	++dec->cur;
		1300
		1301	decode_ws (dec);
		1302
		1303	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1304	{
		1305	++dec->cur;
		1306	break;
		1307	}
789	}	1308	}
790		1309
		1310	DEC_DEC_DEPTH;
791	return newRV_noinc ((SV *)av);	1311	return newRV_noinc ((SV *)av);
792		1312
793	fail:	1313	fail:
794	SvREFCNT_dec (av);	1314	SvREFCNT_dec (av);
		1315	DEC_DEC_DEPTH;
795	return 0;	1316	return 0;
796	}	1317	}
797		1318
798	static SV *	1319	static SV *
799	decode_hv (dec_t *dec)	1320	decode_hv (dec_t *dec)
800	{	1321	{
		1322	SV *sv;
801	HV *hv = newHV ();	1323	HV *hv = newHV ();
802		1324
		1325	DEC_INC_DEPTH;
803	decode_ws (dec);	1326	decode_ws (dec);
		1327
804	if (*dec->cur == '}')	1328	if (*dec->cur == '}')
805	++dec->cur;	1329	++dec->cur;
806	else	1330	else
807	for (;;)	1331	for (;;)
808	{	1332	{
		1333	EXPECT_CH ('"');
		1334
		1335	// heuristic: assume that
		1336	// a) decode_str + hv_store_ent are abysmally slow.
		1337	// b) most hash keys are short, simple ascii text.
		1338	// => try to "fast-match" such strings to avoid
		1339	// the overhead of decode_str + hv_store_ent.
		1340	{
809	SV *key, *value;	1341	SV *value;
		1342	char *p = dec->cur;
		1343	char *e = p + 24; // only try up to 24 bytes
810		1344
811	decode_ws (dec); EXPECT_CH ('"');	1345	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	{	1346	{
		1347	// the >= 0x80 is false on most architectures
		1348	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1349	{
		1350	// slow path, back up and use decode_str
		1351	SV *key = decode_str (dec);
		1352	if (!key)
		1353	goto fail;
		1354
		1355	decode_ws (dec); EXPECT_CH (':');
		1356
		1357	decode_ws (dec);
		1358	value = decode_sv (dec);
		1359	if (!value)
		1360	{
		1361	SvREFCNT_dec (key);
		1362	goto fail;
		1363	}
		1364
		1365	hv_store_ent (hv, key, value, 0);
822	SvREFCNT_dec (key);	1366	SvREFCNT_dec (key);
		1367
		1368	break;
		1369	}
		1370	else if (*p == '"')
		1371	{
		1372	// fast path, got a simple key
		1373	char *key = dec->cur;
		1374	int len = p - key;
		1375	dec->cur = p + 1;
		1376
		1377	decode_ws (dec); EXPECT_CH (':');
		1378
		1379	decode_ws (dec);
		1380	value = decode_sv (dec);
		1381	if (!value)
823	goto fail;	1382	goto fail;
		1383
		1384	hv_store (hv, key, len, value, 0);
		1385
		1386	break;
		1387	}
		1388
		1389	++p;
824	}	1390	}
825		1391	}
826	//TODO: optimise
827	hv_store_ent (hv, key, value, 0);
828		1392
829	decode_ws (dec);	1393	decode_ws (dec);
830		1394
831	if (*dec->cur == '}')	1395	if (*dec->cur == '}')
832	{	1396	{
…		…
836		1400
837	if (*dec->cur != ',')	1401	if (*dec->cur != ',')
838	ERR (", or } expected while parsing object/hash");	1402	ERR (", or } expected while parsing object/hash");
839		1403
840	++dec->cur;	1404	++dec->cur;
		1405
		1406	decode_ws (dec);
		1407
		1408	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1409	{
		1410	++dec->cur;
		1411	break;
		1412	}
841	}	1413	}
842		1414
		1415	DEC_DEC_DEPTH;
843	return newRV_noinc ((SV *)hv);	1416	sv = newRV_noinc ((SV *)hv);
		1417
		1418	// check filter callbacks
		1419	if (dec->json.flags & F_HOOK)
		1420	{
		1421	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1422	{
		1423	HE *cb, *he;
		1424
		1425	hv_iterinit (hv);
		1426	he = hv_iternext (hv);
		1427	hv_iterinit (hv);
		1428
		1429	// the next line creates a mortal sv each time its called.
		1430	// might want to optimise this for common cases.
		1431	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1432
		1433	if (cb)
		1434	{
		1435	dSP;
		1436	int count;
		1437
		1438	ENTER; SAVETMPS; PUSHMARK (SP);
		1439	XPUSHs (HeVAL (he));
		1440	sv_2mortal (sv);
		1441
		1442	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1443
		1444	if (count == 1)
		1445	{
		1446	sv = newSVsv (POPs);
		1447	FREETMPS; LEAVE;
		1448	return sv;
		1449	}
		1450
		1451	SvREFCNT_inc (sv);
		1452	FREETMPS; LEAVE;
		1453	}
		1454	}
		1455
		1456	if (dec->json.cb_object)
		1457	{
		1458	dSP;
		1459	int count;
		1460
		1461	ENTER; SAVETMPS; PUSHMARK (SP);
		1462	XPUSHs (sv_2mortal (sv));
		1463
		1464	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1465
		1466	if (count == 1)
		1467	{
		1468	sv = newSVsv (POPs);
		1469	FREETMPS; LEAVE;
		1470	return sv;
		1471	}
		1472
		1473	SvREFCNT_inc (sv);
		1474	FREETMPS; LEAVE;
		1475	}
		1476	}
		1477
		1478	return sv;
844		1479
845	fail:	1480	fail:
846	SvREFCNT_dec (hv);	1481	SvREFCNT_dec (hv);
		1482	DEC_DEC_DEPTH;
		1483	return 0;
		1484	}
		1485
		1486	static SV *
		1487	decode_tag (dec_t *dec)
		1488	{
		1489	SV *tag = 0;
		1490	SV *val = 0;
		1491
		1492	if (!(dec->json.flags & F_ALLOW_TAGS))
		1493	ERR ("malformed JSON string, neither array, object, number, string or atom");
		1494
		1495	++dec->cur;
		1496
		1497	tag = decode_sv (dec);
		1498	if (!tag)
		1499	goto fail;
		1500
		1501	if (!SvPOK (tag))
		1502	ERR ("malformed JSON string, (tag) must be a string");
		1503
		1504	if (*dec->cur != ')')
		1505	ERR (") expected after tag");
		1506
		1507	++dec->cur;
		1508
		1509	val = decode_sv (dec);
		1510	if (!val)
		1511	goto fail;
		1512
		1513	if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
		1514	ERR ("malformed JSON string, tag value must be an array");
		1515
		1516	{
		1517	AV *av = (AV *)SvRV (val);
		1518	int i, len = av_len (av) + 1;
		1519	HV *stash = gv_stashsv (tag, 0);
		1520	SV *sv;
		1521
		1522	if (!stash)
		1523	ERR ("cannot decode perl-object (package does not exist)");
		1524
		1525	GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
		1526
		1527	if (!method)
		1528	ERR ("cannot decode perl-object (package does not have a THAW method)");
		1529
		1530	dSP;
		1531
		1532	ENTER; SAVETMPS; PUSHMARK (SP);
		1533	EXTEND (SP, len + 2);
		1534	// we re-bless the reference to get overload and other niceties right
		1535	PUSHs (tag);
		1536	PUSHs (sv_json);
		1537
		1538	for (i = 0; i < len; ++i)
		1539	PUSHs (*av_fetch (av, i, 1));
		1540
		1541	PUTBACK;
		1542	call_sv ((SV *)GvCV (method), G_SCALAR);
		1543	SPAGAIN;
		1544
		1545	SvREFCNT_dec (tag);
		1546	SvREFCNT_dec (val);
		1547	sv = SvREFCNT_inc (POPs);
		1548
		1549	PUTBACK;
		1550
		1551	FREETMPS; LEAVE;
		1552
		1553	return sv;
		1554	}
		1555
		1556	fail:
		1557	SvREFCNT_dec (tag);
		1558	SvREFCNT_dec (val);
847	return 0;	1559	return 0;
848	}	1560	}
849		1561
850	static SV *	1562	static SV *
851	decode_sv (dec_t *dec)	1563	decode_sv (dec_t *dec)
852	{	1564	{
853	decode_ws (dec);	1565	// the beauty of JSON: you need exactly one character lookahead
		1566	// to parse everything.
854	switch (*dec->cur)	1567	switch (*dec->cur)
855	{	1568	{
856	case '"': ++dec->cur; return decode_str (dec);	1569	case '"': ++dec->cur; return decode_str (dec);
857	case '[': ++dec->cur; return decode_av (dec);	1570	case '[': ++dec->cur; return decode_av (dec);
858	case '{': ++dec->cur; return decode_hv (dec);	1571	case '{': ++dec->cur; return decode_hv (dec);
		1572	case '(': return decode_tag (dec);
859		1573
860	case '-':	1574	case '-':
861	case '0': case '1': case '2': case '3': case '4':	1575	case '0': case '1': case '2': case '3': case '4':
862	case '5': case '6': case '7': case '8': case '9':	1576	case '5': case '6': case '7': case '8': case '9':
863	return decode_num (dec);	1577	return decode_num (dec);
864		1578
865	case 't':	1579	case 't':
866	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1580	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
867	{	1581	{
868	dec->cur += 4;	1582	dec->cur += 4;
		1583	#if JSON_SLOW
		1584	types_true = get_bool ("Types::Serialiser::true");
		1585	#endif
869	return newSViv (1);	1586	return newSVsv (types_true);
870	}	1587	}
871	else	1588	else
872	ERR ("'true' expected");	1589	ERR ("'true' expected");
873		1590
874	break;	1591	break;
875		1592
876	case 'f':	1593	case 'f':
877	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1594	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
878	{	1595	{
879	dec->cur += 5;	1596	dec->cur += 5;
		1597	#if JSON_SLOW
		1598	types_false = get_bool ("Types::Serialiser::false");
		1599	#endif
880	return newSViv (0);	1600	return newSVsv (types_false);
881	}	1601	}
882	else	1602	else
883	ERR ("'false' expected");	1603	ERR ("'false' expected");
884		1604
885	break;	1605	break;
…		…
894	ERR ("'null' expected");	1614	ERR ("'null' expected");
895		1615
896	break;	1616	break;
897		1617
898	default:	1618	default:
899	ERR ("malformed json string, neither array, object, number, string or atom");	1619	ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
900	break;	1620	break;
901	}	1621	}
902		1622
903	fail:	1623	fail:
904	return 0;	1624	return 0;
905	}	1625	}
906		1626
907	static SV *	1627	static SV *
908	decode_json (SV *string, UV flags)	1628	decode_json (SV *string, JSON *json, char **offset_return)
909	{	1629	{
		1630	dec_t dec;
910	SV *sv;	1631	SV *sv;
911		1632
912	if (flags & F_UTF8)	1633	/* work around bugs in 5.10 where manipulating magic values
		1634	* makes perl ignore the magic in subsequent accesses.
		1635	* also make a copy of non-PV values, to get them into a clean
		1636	* state (SvPV should do that, but it's buggy, see below).
		1637	*/
		1638	/*SvGETMAGIC (string);*/
		1639	if (SvMAGICAL (string) || !SvPOK (string))
		1640	string = sv_2mortal (newSVsv (string));
		1641
		1642	SvUPGRADE (string, SVt_PV);
		1643
		1644	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1645	* assertion with -DDEBUGGING, although SvCUR is documented to
		1646	* return the xpv_cur field which certainly exists after upgrading.
		1647	* according to nicholas clark, calling SvPOK fixes this.
		1648	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1649	* and hope for the best.
		1650	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1651	* assertion business is seriously broken, try yet another workaround
		1652	* for the broken -DDEBUGGING.
		1653	*/
		1654	{
		1655	#ifdef DEBUGGING
		1656	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1657	#else
		1658	STRLEN offset = SvCUR (string);
		1659	#endif
		1660
		1661	if (offset > json->max_size && json->max_size)
		1662	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1663	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1664	}
		1665
		1666	if (DECODE_WANTS_OCTETS (json))
913	sv_utf8_downgrade (string, 0);	1667	sv_utf8_downgrade (string, 0);
914	else	1668	else
915	sv_utf8_upgrade (string);	1669	sv_utf8_upgrade (string);
916		1670
917	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1671	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
918		1672
919	dec_t dec;	1673	dec.json = *json;
920	dec.flags = flags;
921	dec.cur = SvPVX (string);	1674	dec.cur = SvPVX (string);
922	dec.end = SvEND (string);	1675	dec.end = SvEND (string);
923	dec.err = 0;	1676	dec.err = 0;
		1677	dec.depth = 0;
924		1678
		1679	if (dec.json.cb_object || dec.json.cb_sk_object)
		1680	dec.json.flags |= F_HOOK;
		1681
		1682	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1683
		1684	decode_ws (&dec);
925	sv = decode_sv (&dec);	1685	sv = decode_sv (&dec);
926		1686
		1687	if (offset_return)
		1688	*offset_return = dec.cur;
		1689
		1690	if (!(offset_return || !sv))
		1691	{
		1692	// check for trailing garbage
		1693	decode_ws (&dec);
		1694
		1695	if (*dec.cur)
		1696	{
		1697	dec.err = "garbage after JSON object";
		1698	SvREFCNT_dec (sv);
		1699	sv = 0;
		1700	}
		1701	}
		1702
927	if (!sv)	1703	if (!sv)
928	{	1704	{
929	IV offset = dec.flags & F_UTF8
930	? dec.cur - SvPVX (string)
931	: utf8_distance (dec.cur, SvPVX (string));
932	SV *uni = sv_newmortal ();	1705	SV *uni = sv_newmortal ();
933		1706
934	// horrible hack to silence warning inside pv_uni_display	1707	// horrible hack to silence warning inside pv_uni_display
935	COP cop = *PL_curcop;	1708	COP cop = *PL_curcop;
936	cop.cop_warnings = pWARN_NONE;	1709	cop.cop_warnings = pWARN_NONE;
…		…
938	SAVEVPTR (PL_curcop);	1711	SAVEVPTR (PL_curcop);
939	PL_curcop = &cop;	1712	PL_curcop = &cop;
940	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1713	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
941	LEAVE;	1714	LEAVE;
942		1715
943	croak ("%s, at character offset %d (%s)",	1716	croak ("%s, at character offset %d (before \"%s\")",
944	dec.err,	1717	dec.err,
945	(int)offset,	1718	(int)ptr_to_index (string, dec.cur),
946	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1719	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
947	}	1720	}
948		1721
949	sv = sv_2mortal (sv);	1722	sv = sv_2mortal (sv);
950		1723
951	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1724	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (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)");	1725	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
953		1726
954	return sv;	1727	return sv;
		1728	}
		1729
		1730	/////////////////////////////////////////////////////////////////////////////
		1731	// incremental parser
		1732
		1733	static void
		1734	incr_parse (JSON *self)
		1735	{
		1736	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1737
		1738	// the state machine here is a bit convoluted and could be simplified a lot
		1739	// but this would make it slower, so...
		1740
		1741	for (;;)
		1742	{
		1743	//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
		1744	switch (self->incr_mode)
		1745	{
		1746	// only used for initial whitespace skipping
		1747	case INCR_M_WS:
		1748	for (;;)
		1749	{
		1750	if (*p > 0x20)
		1751	{
		1752	if (*p == '#')
		1753	{
		1754	self->incr_mode = INCR_M_C0;
		1755	goto incr_m_c;
		1756	}
		1757	else
		1758	{
		1759	self->incr_mode = INCR_M_JSON;
		1760	goto incr_m_json;
		1761	}
		1762	}
		1763	else if (!*p)
		1764	goto interrupt;
		1765
		1766	++p;
		1767	}
		1768
		1769	// skip a single char inside a string (for \\-processing)
		1770	case INCR_M_BS:
		1771	if (!*p)
		1772	goto interrupt;
		1773
		1774	++p;
		1775	self->incr_mode = INCR_M_STR;
		1776	goto incr_m_str;
		1777
		1778	// inside #-style comments
		1779	case INCR_M_C0:
		1780	case INCR_M_C1:
		1781	incr_m_c:
		1782	for (;;)
		1783	{
		1784	if (*p == '\n')
		1785	{
		1786	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1787	break;
		1788	}
		1789	else if (!*p)
		1790	goto interrupt;
		1791
		1792	++p;
		1793	}
		1794
		1795	break;
		1796
		1797	// inside a string
		1798	case INCR_M_STR:
		1799	incr_m_str:
		1800	for (;;)
		1801	{
		1802	if (*p == '"')
		1803	{
		1804	++p;
		1805	self->incr_mode = INCR_M_JSON;
		1806
		1807	if (!self->incr_nest)
		1808	goto interrupt;
		1809
		1810	goto incr_m_json;
		1811	}
		1812	else if (*p == '\\')
		1813	{
		1814	++p; // "virtually" consumes character after \
		1815
		1816	if (!*p) // if at end of string we have to switch modes
		1817	{
		1818	self->incr_mode = INCR_M_BS;
		1819	goto interrupt;
		1820	}
		1821	}
		1822	else if (!*p)
		1823	goto interrupt;
		1824
		1825	++p;
		1826	}
		1827
		1828	// after initial ws, outside string
		1829	case INCR_M_JSON:
		1830	incr_m_json:
		1831	for (;;)
		1832	{
		1833	switch (*p++)
		1834	{
		1835	case 0:
		1836	--p;
		1837	goto interrupt;
		1838
		1839	case 0x09:
		1840	case 0x0a:
		1841	case 0x0d:
		1842	case 0x20:
		1843	if (!self->incr_nest)
		1844	{
		1845	--p; // do not eat the whitespace, let the next round do it
		1846	goto interrupt;
		1847	}
		1848	break;
		1849
		1850	case '"':
		1851	self->incr_mode = INCR_M_STR;
		1852	goto incr_m_str;
		1853
		1854	case '[':
		1855	case '{':
		1856	case '(':
		1857	if (++self->incr_nest > self->max_depth)
		1858	croak (ERR_NESTING_EXCEEDED);
		1859	break;
		1860
		1861	case ']':
		1862	case '}':
		1863	if (--self->incr_nest <= 0)
		1864	goto interrupt;
		1865	break;
		1866
		1867	case ')':
		1868	--self->incr_nest;
		1869	break;
		1870
		1871	case '#':
		1872	self->incr_mode = INCR_M_C1;
		1873	goto incr_m_c;
		1874	}
		1875	}
		1876	}
		1877
		1878	modechange:
		1879	;
		1880	}
		1881
		1882	interrupt:
		1883	self->incr_pos = p - SvPVX (self->incr_text);
		1884	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1885	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
955	}	1886	}
956		1887
957	/////////////////////////////////////////////////////////////////////////////	1888	/////////////////////////////////////////////////////////////////////////////
958	// XS interface functions	1889	// XS interface functions
959		1890
…		…
961		1892
962	BOOT:	1893	BOOT:
963	{	1894	{
964	int i;	1895	int i;
965		1896
966	memset (decode_hexdigit, 0xff, 256);
967	for (i = 10; i--; )	1897	for (i = 0; i < 256; ++i)
968	decode_hexdigit ['0' + i] = i;	1898	decode_hexdigit [i] =
		1899	i >= '0' && i <= '9' ? i - '0'
		1900	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1901	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1902	: -1;
969		1903
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);	1904	json_stash = gv_stashpv ("JSON::XS" , 1);
		1905	types_boolean_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
		1906
		1907	types_true = get_bool ("Types::Serialiser::true");
		1908	types_false = get_bool ("Types::Serialiser::false");
		1909
		1910	sv_json = newSVpv ("JSON", 0);
		1911	SvREADONLY_on (sv_json);
		1912
		1913	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
977	}	1914	}
978		1915
979	PROTOTYPES: DISABLE	1916	PROTOTYPES: DISABLE
980		1917
981	SV *new (char *dummy)	1918	void CLONE (...)
982	CODE:	1919	CODE:
983	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1920	json_stash = 0;
		1921	types_boolean_stash = 0;
		1922
		1923	void new (char *klass)
		1924	PPCODE:
		1925	{
		1926	SV *pv = NEWSV (0, sizeof (JSON));
		1927	SvPOK_only (pv);
		1928	json_init ((JSON *)SvPVX (pv));
		1929	XPUSHs (sv_2mortal (sv_bless (
		1930	newRV_noinc (pv),
		1931	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1932	)));
		1933	}
		1934
		1935	void ascii (JSON *self, int enable = 1)
		1936	ALIAS:
		1937	ascii = F_ASCII
		1938	latin1 = F_LATIN1
		1939	utf8 = F_UTF8
		1940	indent = F_INDENT
		1941	canonical = F_CANONICAL
		1942	space_before = F_SPACE_BEFORE
		1943	space_after = F_SPACE_AFTER
		1944	pretty = F_PRETTY
		1945	allow_nonref = F_ALLOW_NONREF
		1946	shrink = F_SHRINK
		1947	allow_blessed = F_ALLOW_BLESSED
		1948	convert_blessed = F_CONV_BLESSED
		1949	relaxed = F_RELAXED
		1950	allow_unknown = F_ALLOW_UNKNOWN
		1951	allow_tags = F_ALLOW_TAGS
		1952	PPCODE:
		1953	{
		1954	if (enable)
		1955	self->flags |= ix;
		1956	else
		1957	self->flags &= ~ix;
		1958
		1959	XPUSHs (ST (0));
		1960	}
		1961
		1962	void get_ascii (JSON *self)
		1963	ALIAS:
		1964	get_ascii = F_ASCII
		1965	get_latin1 = F_LATIN1
		1966	get_utf8 = F_UTF8
		1967	get_indent = F_INDENT
		1968	get_canonical = F_CANONICAL
		1969	get_space_before = F_SPACE_BEFORE
		1970	get_space_after = F_SPACE_AFTER
		1971	get_allow_nonref = F_ALLOW_NONREF
		1972	get_shrink = F_SHRINK
		1973	get_allow_blessed = F_ALLOW_BLESSED
		1974	get_convert_blessed = F_CONV_BLESSED
		1975	get_relaxed = F_RELAXED
		1976	get_allow_unknown = F_ALLOW_UNKNOWN
		1977	get_allow_tags = F_ALLOW_TAGS
		1978	PPCODE:
		1979	XPUSHs (boolSV (self->flags & ix));
		1980
		1981	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		1982	PPCODE:
		1983	self->max_depth = max_depth;
		1984	XPUSHs (ST (0));
		1985
		1986	U32 get_max_depth (JSON *self)
		1987	CODE:
		1988	RETVAL = self->max_depth;
984	OUTPUT:	1989	OUTPUT:
985	RETVAL	1990	RETVAL
986		1991
987	SV *ascii (SV *self, int enable = 1)	1992	void max_size (JSON *self, U32 max_size = 0)
988	ALIAS:	1993	PPCODE:
989	ascii = F_ASCII	1994	self->max_size = max_size;
990	utf8 = F_UTF8	1995	XPUSHs (ST (0));
991	indent = F_INDENT	1996
992	canonical = F_CANONICAL	1997	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:	1998	CODE:
999	{	1999	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:	2000	OUTPUT:
1009	RETVAL	2001	RETVAL
1010		2002
1011	void encode (SV *self, SV *scalar)	2003	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1012	PPCODE:	2004	PPCODE:
1013	XPUSHs (encode_json (scalar, *SvJSON (self)));	2005	{
		2006	SvREFCNT_dec (self->cb_object);
		2007	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1014		2008
1015	void decode (SV *self, SV *jsonstr)	2009	XPUSHs (ST (0));
		2010	}
		2011
		2012	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1016	PPCODE:	2013	PPCODE:
1017	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	2014	{
		2015	if (!self->cb_sk_object)
		2016	self->cb_sk_object = newHV ();
		2017
		2018	if (SvOK (cb))
		2019	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		2020	else
		2021	{
		2022	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		2023
		2024	if (!HvKEYS (self->cb_sk_object))
		2025	{
		2026	SvREFCNT_dec (self->cb_sk_object);
		2027	self->cb_sk_object = 0;
		2028	}
		2029	}
		2030
		2031	XPUSHs (ST (0));
		2032	}
		2033
		2034	void encode (JSON *self, SV *scalar)
		2035	PPCODE:
		2036	PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
		2037	XPUSHs (scalar);
		2038
		2039	void decode (JSON *self, SV *jsonstr)
		2040	PPCODE:
		2041	PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
		2042	XPUSHs (jsonstr);
		2043
		2044	void decode_prefix (JSON *self, SV *jsonstr)
		2045	PPCODE:
		2046	{
		2047	SV *sv;
		2048	char *offset;
		2049	PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
		2050	EXTEND (SP, 2);
		2051	PUSHs (sv);
		2052	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		2053	}
		2054
		2055	void incr_parse (JSON *self, SV *jsonstr = 0)
		2056	PPCODE:
		2057	{
		2058	if (!self->incr_text)
		2059	self->incr_text = newSVpvn ("", 0);
		2060
		2061	/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
		2062	if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
		2063	if (DECODE_WANTS_OCTETS (self))
		2064	{
		2065	if (self->incr_pos)
		2066	self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
		2067	(U8 *)SvPVX (self->incr_text) + self->incr_pos);
		2068
		2069	sv_utf8_downgrade (self->incr_text, 0);
		2070	}
		2071	else
		2072	{
		2073	sv_utf8_upgrade (self->incr_text);
		2074
		2075	if (self->incr_pos)
		2076	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		2077	- (U8 *)SvPVX (self->incr_text);
		2078	}
		2079
		2080	// append data, if any
		2081	if (jsonstr)
		2082	{
		2083	/* make sure both strings have same encoding */
		2084	if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
		2085	if (SvUTF8 (jsonstr))
		2086	sv_utf8_downgrade (jsonstr, 0);
		2087	else
		2088	sv_utf8_upgrade (jsonstr);
		2089
		2090	/* and then just blindly append */
		2091	{
		2092	STRLEN len;
		2093	const char *str = SvPV (jsonstr, len);
		2094	STRLEN cur = SvCUR (self->incr_text);
		2095
		2096	if (SvLEN (self->incr_text) <= cur + len)
		2097	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		2098
		2099	Move (str, SvEND (self->incr_text), len, char);
		2100	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		2101	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		2102	}
		2103	}
		2104
		2105	if (GIMME_V != G_VOID)
		2106	do
		2107	{
		2108	SV *sv;
		2109	char *offset;
		2110
		2111	if (!INCR_DONE (self))
		2112	{
		2113	incr_parse (self);
		2114
		2115	if (self->incr_pos > self->max_size && self->max_size)
		2116	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		2117	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		2118
		2119	if (!INCR_DONE (self))
		2120	{
		2121	// as an optimisation, do not accumulate white space in the incr buffer
		2122	if (self->incr_mode == INCR_M_WS && self->incr_pos)
		2123	{
		2124	self->incr_pos = 0;
		2125	SvCUR_set (self->incr_text, 0);
		2126	}
		2127
		2128	break;
		2129	}
		2130	}
		2131
		2132	PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
		2133	XPUSHs (sv);
		2134
		2135	self->incr_pos -= offset - SvPVX (self->incr_text);
		2136	self->incr_nest = 0;
		2137	self->incr_mode = 0;
		2138
		2139	sv_chop (self->incr_text, offset);
		2140	}
		2141	while (GIMME_V == G_ARRAY);
		2142	}
		2143
		2144	SV *incr_text (JSON *self)
		2145	ATTRS: lvalue
		2146	CODE:
		2147	{
		2148	if (self->incr_pos)
		2149	croak ("incr_text can not be called when the incremental parser already started parsing");
		2150
		2151	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		2152	}
		2153	OUTPUT:
		2154	RETVAL
		2155
		2156	void incr_skip (JSON *self)
		2157	CODE:
		2158	{
		2159	if (self->incr_pos)
		2160	{
		2161	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2162	self->incr_pos = 0;
		2163	self->incr_nest = 0;
		2164	self->incr_mode = 0;
		2165	}
		2166	}
		2167
		2168	void incr_reset (JSON *self)
		2169	CODE:
		2170	{
		2171	SvREFCNT_dec (self->incr_text);
		2172	self->incr_text = 0;
		2173	self->incr_pos = 0;
		2174	self->incr_nest = 0;
		2175	self->incr_mode = 0;
		2176	}
		2177
		2178	void DESTROY (JSON *self)
		2179	CODE:
		2180	SvREFCNT_dec (self->cb_sk_object);
		2181	SvREFCNT_dec (self->cb_object);
		2182	SvREFCNT_dec (self->incr_text);
1018		2183
1019	PROTOTYPES: ENABLE	2184	PROTOTYPES: ENABLE
1020		2185
1021	void to_json (SV *scalar)	2186	void encode_json (SV *scalar)
1022	PPCODE:	2187	PPCODE:
1023	XPUSHs (encode_json (scalar, F_UTF8));	2188	{
		2189	JSON json;
		2190	json_init (&json);
		2191	json.flags |= F_UTF8;
		2192	PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
		2193	XPUSHs (scalar);
		2194	}
1024		2195
1025	void from_json (SV *jsonstr)	2196	void decode_json (SV *jsonstr)
1026	PPCODE:	2197	PPCODE:
1027	XPUSHs (decode_json (jsonstr, F_UTF8));	2198	{
		2199	JSON json;
		2200	json_init (&json);
		2201	json.flags |= F_UTF8;
		2202	PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
		2203	XPUSHs (jsonstr);
		2204	}
1028		2205

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