json.cpp@ 62559

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1	/* $Id: json.cpp 62461 2016-07-22 16:21:26Z vboxsync $ */
2	/** @file
3	* IPRT JSON parser API (JSON).
4	*/
5
6	/*
7	* Copyright (C) 2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include <iprt/asm.h>
32	#include <iprt/assert.h>
33	#include <iprt/cdefs.h>
34	#include <iprt/ctype.h>
35	#include <iprt/json.h>
36	#include <iprt/mem.h>
37	#include <iprt/stream.h>
38	#include <iprt/string.h>
39
40
41	/*********************************************************************************************************************************
42	* Structures and Typedefs *
43	*********************************************************************************************************************************/
44
45	/**
46	* JSON parser position information.
47	*/
48	typedef struct RTJSONPOS
49	{
50	/** Line in the source. */
51	size_t iLine;
52	/** Current start character .*/
53	size_t iChStart;
54	/** Current end character. */
55	size_t iChEnd;
56	} RTJSONPOS;
57	/** Pointer to a position. */
58	typedef RTJSONPOS *PRTJSONPOS;
59
60	/**
61	* JSON token class.
62	*/
63	typedef enum RTJSONTOKENCLASS
64	{
65	/** Invalid. */
66	RTJSONTOKENCLASS_INVALID = 0,
67	/** Array begin. */
68	RTJSONTOKENCLASS_BEGIN_ARRAY,
69	/** Object begin. */
70	RTJSONTOKENCLASS_BEGIN_OBJECT,
71	/** Array end. */
72	RTJSONTOKENCLASS_END_ARRAY,
73	/** Object end. */
74	RTJSONTOKENCLASS_END_OBJECT,
75	/** Separator for name/value pairs. */
76	RTJSONTOKENCLASS_NAME_SEPARATOR,
77	/** Value separator. */
78	RTJSONTOKENCLASS_VALUE_SEPARATOR,
79	/** String */
80	RTJSONTOKENCLASS_STRING,
81	/** Number. */
82	RTJSONTOKENCLASS_NUMBER,
83	/** null keyword. */
84	RTJSONTOKENCLASS_NULL,
85	/** false keyword. */
86	RTJSONTOKENCLASS_FALSE,
87	/** true keyword. */
88	RTJSONTOKENCLASS_TRUE,
89	/** End of stream */
90	RTJSONTOKENCLASS_EOS,
91	/** 32bit hack. */
92	RTJSONTOKENCLASS_32BIT_HACK = 0x7fffffff
93	} RTJSONTOKENCLASS;
94	/** Pointer to a token class. */
95	typedef RTJSONTOKENCLASS *PRTJSONTOKENCLASS;
96
97	/**
98	* JSON token.
99	*/
100	typedef struct RTJSONTOKEN
101	{
102	/** Token class. */
103	RTJSONTOKENCLASS enmClass;
104	/** Token position in the source buffer. */
105	RTJSONPOS Pos;
106	/** Data based on the token class. */
107	union
108	{
109	/** String. */
110	struct
111	{
112	/** Pointer to the start of the string. */
113	char *pszStr;
114	} String;
115	/** Number. */
116	struct
117	{
118	int64_t i64Num;
119	} Number;
120	} Class;
121	} RTJSONTOKEN;
122	/** Pointer to a JSON token. */
123	typedef RTJSONTOKEN *PRTJSONTOKEN;
124	/** Pointer to a const script token. */
125	typedef const RTJSONTOKEN *PCRTJSONTOKEN;
126
127	/**
128	* Tokenizer read input callback.
129	*
130	* @returns IPRT status code.
131	* @param pvUser Opaque user data for the callee.
132	* @param offInput Start offset from the start of the input stream to read from.
133	* @param pvBuf Where to store the read data.
134	* @param cbBuf How much to read.
135	* @param pcbRead Where to store the amount of data read on succcess.
136	*/
137	typedef DECLCALLBACK(int) FNRTJSONTOKENIZERREAD(void pvUser, size_t offInput, void pvBuf, size_t cbBuf,
138	size_t *pcbRead);
139	/** Pointer to a tokenizer read buffer callback. */
140	typedef FNRTJSONTOKENIZERREAD *PFNRTJSONTOKENIZERREAD;
141
142	/**
143	* Tokenizer state.
144	*/
145	typedef struct RTJSONTOKENIZER
146	{
147	/** Read callback. */
148	PFNRTJSONTOKENIZERREAD pfnRead;
149	/** Opaque user data. */
150	void *pvUser;
151	/** Current offset into the input stream. */
152	size_t offInput;
153	/** Number of valid bytes in the input buffer. */
154	size_t cbBuf;
155	/* Current offset into the input buffer. */
156	size_t offBuf;
157	/** Input cache buffer. */
158	char achBuf[512];
159	/** Current position into the input stream. */
160	RTJSONPOS Pos;
161	/** Token 1. */
162	RTJSONTOKEN Token1;
163	/** Token 2. */
164	RTJSONTOKEN Token2;
165	/** Pointer to the current active token. */
166	PRTJSONTOKEN pTokenCurr;
167	/** The next token in the input stream (used for peeking). */
168	PRTJSONTOKEN pTokenNext;
169	} RTJSONTOKENIZER;
170	/** Pointer to a JSON tokenizer. */
171	typedef RTJSONTOKENIZER *PRTJSONTOKENIZER;
172
173	/** Pointer to the internal JSON value instance. */
174	typedef struct RTJSONVALINT *PRTJSONVALINT;
175
176	/**
177	* A JSON value.
178	*/
179	typedef struct RTJSONVALINT
180	{
181	/** Type of the JSON value. */
182	RTJSONVALTYPE enmType;
183	/** Reference count for this JSON value. */
184	volatile uint32_t cRefs;
185	/** Type dependent data. */
186	union
187	{
188	/** String type*/
189	struct
190	{
191	/** Pointer to the string. */
192	char *pszStr;
193	} String;
194	/** Number type. */
195	struct
196	{
197	/** Signed 64-bit integer. */
198	int64_t i64Num;
199	} Number;
200	/** Array type. */
201	struct
202	{
203	/** Number of elements in the array. */
204	unsigned cItems;
205	/** Pointer to the array of items. */
206	PRTJSONVALINT *papItems;
207	} Array;
208	/** Object type. */
209	struct
210	{
211	/** Number of members. */
212	unsigned cMembers;
213	/** Pointer to the array holding the member names. */
214	char **papszNames;
215	/** Pointer to the array holding the values. */
216	PRTJSONVALINT *papValues;
217	} Object;
218	} Type;
219	} RTJSONVALINT;
220
221	/**
222	* A JSON iterator.
223	*/
224	typedef struct RTJSONITINT
225	{
226	/** Referenced JSON value. */
227	PRTJSONVALINT pJsonVal;
228	/** Current index. */
229	unsigned idxCur;
230	} RTJSONITINT;
231	/** Pointer to the internal JSON iterator instance. */
232	typedef RTJSONITINT *PRTJSONITINT;
233
234	/**
235	* Passing arguments for the read callbacks.
236	*/
237	typedef struct RTJSONREADERARGS
238	{
239	/** Buffer/File size */
240	size_t cbData;
241	/** Data specific for one callback. */
242	union
243	{
244	PRTSTREAM hStream;
245	const uint8_t *pbBuf;
246	} u;
247	} RTJSONREADERARGS;
248	/** Pointer to a readers argument. */
249	typedef RTJSONREADERARGS *PRTJSONREADERARGS;
250
251
252	/*********************************************************************************************************************************
253	* Global variables *
254	*********************************************************************************************************************************/
255
256	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
257	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo);
258
259	/**
260	* Fill the input buffer from the input stream.
261	*
262	* @returns IPRT status code.
263	* @param pTokenizer The tokenizer state.
264	*/
265	static int rtJsonTokenizerRead(PRTJSONTOKENIZER pTokenizer)
266	{
267	size_t cbRead = 0;
268	int rc = pTokenizer->pfnRead(pTokenizer->pvUser, pTokenizer->offInput, &pTokenizer->achBuf[0],
269	sizeof(pTokenizer->achBuf), &cbRead);
270	if (RT_SUCCESS(rc))
271	{
272	pTokenizer->cbBuf = cbRead;
273	pTokenizer->offInput += cbRead;
274	pTokenizer->offBuf = 0;
275	/* Validate UTF-8 encoding. */
276	rc = RTStrValidateEncodingEx(&pTokenizer->achBuf[0], cbRead, 0 /* fFlags */);
277	/* If we read less than requested we reached the end and fill the remainder with terminators. */
278	if (cbRead < sizeof(pTokenizer->achBuf))
279	memset(&pTokenizer->achBuf[cbRead], 0, sizeof(pTokenizer->achBuf) - cbRead);
280	}
281
282	return rc;
283	}
284
285	/**
286	* Skips the given amount of characters in the input stream.
287	*
288	* @returns IPRT status code.
289	* @param pTokenizer The tokenizer state.
290	* @param cchSkip The amount of characters to skip.
291	*/
292	static int rtJsonTokenizerSkip(PRTJSONTOKENIZER pTokenizer, size_t cchSkip)
293	{
294	int rc = VINF_SUCCESS;
295
296	/*
297	* In case we reached the end of the stream don't even attempt to read new data.
298	* Safety precaution for possible bugs in the parser causing out of bounds reads
299	*/
300	if (pTokenizer->achBuf[pTokenizer->offBuf] == '\0')
301	return rc;
302
303	while ( cchSkip > 0
304	&& pTokenizer->offBuf < pTokenizer->cbBuf
305	&& RT_SUCCESS(rc))
306	{
307	size_t cchThisSkip = RT_MIN(cchSkip, pTokenizer->cbBuf - pTokenizer->offBuf);
308
309	pTokenizer->offBuf += cchThisSkip;
310	/* Read new data if required and we didn't reach the end yet. */
311	if ( pTokenizer->offBuf == pTokenizer->cbBuf
312	&& pTokenizer->cbBuf == sizeof(pTokenizer->achBuf))
313	rc = rtJsonTokenizerRead(pTokenizer);
314
315	cchSkip -= cchThisSkip;
316	}
317
318	return rc;
319	}
320
321
322	/**
323	* Returns whether the tokenizer reached the end of the stream.
324	*
325	* @returns true if the tokenizer reached the end of stream marker
326	* false otherwise.
327	* @param pTokenizer The tokenizer state.
328	*/
329	DECLINLINE(bool) rtJsonTokenizerIsEos(PRTJSONTOKENIZER pTokenizer)
330	{
331	return pTokenizer->achBuf[pTokenizer->offBuf] == '\0';
332	}
333
334	/**
335	* Skip one character in the input stream.
336	*
337	* @returns nothing.
338	* @param pTokenizer The tokenizer state.
339	*/
340	DECLINLINE(void) rtJsonTokenizerSkipCh(PRTJSONTOKENIZER pTokenizer)
341	{
342	rtJsonTokenizerSkip(pTokenizer, 1);
343	pTokenizer->Pos.iChStart++;
344	pTokenizer->Pos.iChEnd++;
345	}
346
347	/**
348	* Returns the next char in the input buffer without advancing it.
349	*
350	* @returns Next character in the input buffer.
351	* @param pTokenizer The tokenizer state.
352	*/
353	DECLINLINE(char) rtJsonTokenizerPeekCh(PRTJSONTOKENIZER pTokenizer)
354	{
355	return rtJsonTokenizerIsEos(pTokenizer)
356	? '\0'
357	: pTokenizer->achBuf[pTokenizer->offBuf + 1]; /** @todo: Read out of bounds */
358	}
359
360	/**
361	* Returns the next character in the input buffer advancing the internal
362	* position.
363	*
364	* @returns Next character in the stream.
365	* @param pTokenizer The tokenizer state.
366	*/
367	DECLINLINE(char) rtJsonTokenizerGetCh(PRTJSONTOKENIZER pTokenizer)
368	{
369	char ch;
370
371	if (rtJsonTokenizerIsEos(pTokenizer))
372	ch = '\0';
373	else
374	ch = pTokenizer->achBuf[pTokenizer->offBuf];
375
376	return ch;
377	}
378
379	/**
380	* Sets a new line for the tokenizer.
381	*
382	* @returns nothing.
383	* @param pTokenizer The tokenizer state.
384	* @param cSkip Amount of characters to skip making up the new line.
385	*/
386	DECLINLINE(void) rtJsonTokenizerNewLine(PRTJSONTOKENIZER pTokenizer, unsigned cSkip)
387	{
388	rtJsonTokenizerSkip(pTokenizer, cSkip);
389	pTokenizer->Pos.iLine++;
390	pTokenizer->Pos.iChStart = 1;
391	pTokenizer->Pos.iChEnd = 1;
392	}
393
394	/**
395	* Checks whether the current position in the input stream is a new line
396	* and skips it.
397	*
398	* @returns Flag whether there was a new line at the current position
399	* in the input buffer.
400	* @param pTokenizer The tokenizer state.
401	*/
402	DECLINLINE(bool) rtJsonTokenizerIsSkipNewLine(PRTJSONTOKENIZER pTokenizer)
403	{
404	bool fNewline = true;
405
406	if ( rtJsonTokenizerGetCh(pTokenizer) == '\r'
407	&& rtJsonTokenizerPeekCh(pTokenizer) == '\n')
408	rtJsonTokenizerNewLine(pTokenizer, 2);
409	else if (rtJsonTokenizerGetCh(pTokenizer) == '\n')
410	rtJsonTokenizerNewLine(pTokenizer, 1);
411	else
412	fNewline = false;
413
414	return fNewline;
415	}
416
417	/**
418	* Skip all whitespace starting from the current input buffer position.
419	* Skips all present comments too.
420	*
421	* @returns nothing.
422	* @param pTokenizer The tokenizer state.
423	*/
424	DECLINLINE(void) rtJsonTokenizerSkipWhitespace(PRTJSONTOKENIZER pTokenizer)
425	{
426	while (!rtJsonTokenizerIsEos(pTokenizer))
427	{
428	while ( rtJsonTokenizerGetCh(pTokenizer) == ' '
429	\|\| rtJsonTokenizerGetCh(pTokenizer) == '\t')
430	rtJsonTokenizerSkipCh(pTokenizer);
431
432	if ( !rtJsonTokenizerIsEos(pTokenizer)
433	&& !rtJsonTokenizerIsSkipNewLine(pTokenizer))
434	{
435	break; /* Skipped everything, next is some real content. */
436	}
437	}
438	}
439
440	/**
441	* Get an literal token from the tokenizer.
442	*
443	* @returns IPRT status code.
444	* @param pTokenizer The tokenizer state.
445	* @param pToken The uninitialized token.
446	*/
447	static int rtJsonTokenizerGetLiteral(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
448	{
449	int rc = VINF_SUCCESS;
450	char ch = rtJsonTokenizerGetCh(pTokenizer);
451	size_t cchLiteral = 0;
452	char szLiteral[6]; /* false + 0 terminator as the lingest possible literal. */
453	RT_ZERO(szLiteral);
454
455	pToken->Pos = pTokenizer->Pos;
456
457	Assert(RT_C_IS_ALPHA(ch));
458
459	while ( RT_C_IS_ALPHA(ch)
460	&& cchLiteral < RT_ELEMENTS(szLiteral) - 1)
461	{
462	szLiteral[cchLiteral] = ch;
463	cchLiteral++;
464	rtJsonTokenizerSkipCh(pTokenizer);
465	ch = rtJsonTokenizerGetCh(pTokenizer);
466	}
467
468	if (!RTStrNCmp(&szLiteral[0], "false", RT_ELEMENTS(szLiteral)))
469	pToken->enmClass = RTJSONTOKENCLASS_FALSE;
470	else if (!RTStrNCmp(&szLiteral[0], "true", RT_ELEMENTS(szLiteral)))
471	pToken->enmClass = RTJSONTOKENCLASS_TRUE;
472	else if (!RTStrNCmp(&szLiteral[0], "null", RT_ELEMENTS(szLiteral)))
473	pToken->enmClass = RTJSONTOKENCLASS_NULL;
474	else
475	{
476	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
477	rc = VERR_JSON_MALFORMED;
478	}
479
480	pToken->Pos.iChEnd += cchLiteral;
481	return rc;
482	}
483
484	/**
485	* Get a numerical constant from the tokenizer.
486	*
487	* @returns IPRT status code.
488	* @param pTokenizer The tokenizer state.
489	* @param pToken The uninitialized token.
490	*/
491	static int rtJsonTokenizerGetNumber(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
492	{
493	size_t cchNum = 0;
494	char szTmp[128]; /* Everything larger is not possible to display in signed 64bit. */
495
496	pToken->enmClass = RTJSONTOKENCLASS_NUMBER;
497
498	char ch = rtJsonTokenizerGetCh(pTokenizer);
499	while ( RT_C_IS_DIGIT(ch)
500	&& cchNum < sizeof(szTmp) - 1)
501	{
502	szTmp[cchNum] = ch;
503	cchNum++;
504	rtJsonTokenizerSkipCh(pTokenizer);
505	ch = rtJsonTokenizerGetCh(pTokenizer);
506	}
507
508	int rc = VINF_SUCCESS;
509	if (RT_C_IS_DIGIT(ch) && cchNum >= sizeof(szTmp) - 1)
510	rc = VERR_NUMBER_TOO_BIG;
511	else
512	{
513	szTmp[cchNum] = '\0';
514	rc = RTStrToInt64Ex(&szTmp[0], NULL, 0, &pToken->Class.Number.i64Num);
515	Assert(RT_SUCCESS(rc) \|\| rc == VWRN_NUMBER_TOO_BIG);
516	if (rc == VWRN_NUMBER_TOO_BIG)
517	rc = VERR_NUMBER_TOO_BIG;
518	}
519
520	return rc;
521	}
522
523	/**
524	* Parses a string constant.
525	*
526	* @returns IPRT status code.
527	* @param pTokenizer The tokenizer state.
528	* @param pToken The uninitialized token.
529	*/
530	static int rtJsonTokenizerGetString(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
531	{
532	int rc = VINF_SUCCESS;
533	size_t cchStr = 0;
534	char szTmp[_4K];
535	RT_ZERO(szTmp);
536
537	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\"');
538	rtJsonTokenizerSkipCh(pTokenizer); /* Skip " */
539
540	pToken->enmClass = RTJSONTOKENCLASS_STRING;
541	pToken->Pos = pTokenizer->Pos;
542
543	char ch = rtJsonTokenizerGetCh(pTokenizer);
544	while ( ch != '\"'
545	&& ch != '\0'
546	&& cchStr < sizeof(szTmp) - 1)
547	{
548	if (ch == '\\')
549	{
550	/* Escape sequence, check the next character */
551	rtJsonTokenizerSkipCh(pTokenizer);
552	char chNext = rtJsonTokenizerGetCh(pTokenizer);
553	switch (chNext)
554	{
555	case '\"':
556	szTmp[cchStr] = '\"';
557	break;
558	case '\\':
559	szTmp[cchStr] = '\\';
560	break;
561	case '/':
562	szTmp[cchStr] = '/';
563	break;
564	case '\b':
565	szTmp[cchStr] = '\b';
566	break;
567	case '\n':
568	szTmp[cchStr] = '\n';
569	break;
570	case '\f':
571	szTmp[cchStr] = '\f';
572	break;
573	case '\r':
574	szTmp[cchStr] = '\r';
575	break;
576	case '\t':
577	szTmp[cchStr] = '\t';
578	break;
579	case 'u':
580	rc = VERR_NOT_SUPPORTED;
581	break;
582	default:
583	rc = VERR_JSON_MALFORMED;
584	}
585	}
586	else
587	szTmp[cchStr] = ch;
588	cchStr++;
589	rtJsonTokenizerSkipCh(pTokenizer);
590	ch = rtJsonTokenizerGetCh(pTokenizer);
591	}
592
593	if (rtJsonTokenizerGetCh(pTokenizer) == '\"')
594	rtJsonTokenizerSkipCh(pTokenizer); /* Skip closing " */
595
596	pToken->Class.String.pszStr = RTStrDupN(&szTmp[0], cchStr);
597	if (pToken->Class.String.pszStr)
598	pToken->Pos.iChEnd += cchStr;
599	else
600	rc = VERR_NO_STR_MEMORY;
601	return rc;
602	}
603
604	/**
605	* Get the end of stream token.
606	*
607	* @returns IPRT status code.
608	* @param pTokenizer The tokenizer state.
609	* @param pToken The uninitialized token.
610	*/
611	static int rtJsonTokenizerGetEos(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
612	{
613	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\0');
614
615	pToken->enmClass = RTJSONTOKENCLASS_EOS;
616	pToken->Pos = pTokenizer->Pos;
617	return VINF_SUCCESS;
618	}
619
620	/**
621	* Read the next token from the tokenizer stream.
622	*
623	* @returns IPRT status code.
624	* @param pTokenizer The tokenizer to read from.
625	* @param pToken Uninitialized token to fill the token data into.
626	*/
627	static int rtJsonTokenizerReadNextToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
628	{
629	int rc = VINF_SUCCESS;
630
631	/* Skip all eventually existing whitespace and newlines first. */
632	rtJsonTokenizerSkipWhitespace(pTokenizer);
633
634	char ch = rtJsonTokenizerGetCh(pTokenizer);
635	if (RT_C_IS_ALPHA(ch))
636	rc = rtJsonTokenizerGetLiteral(pTokenizer, pToken);
637	else if (RT_C_IS_DIGIT(ch))
638	rc = rtJsonTokenizerGetNumber(pTokenizer, pToken);
639	else if (ch == '\"')
640	rc = rtJsonTokenizerGetString(pTokenizer, pToken);
641	else if (ch == '\0')
642	rc = rtJsonTokenizerGetEos(pTokenizer, pToken);
643	else if (ch == '{')
644	{
645	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_OBJECT;
646	rtJsonTokenizerSkipCh(pTokenizer);
647	}
648	else if (ch == '}')
649	{
650	pToken->enmClass = RTJSONTOKENCLASS_END_OBJECT;
651	rtJsonTokenizerSkipCh(pTokenizer);
652	}
653	else if (ch == '[')
654	{
655	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_ARRAY;
656	rtJsonTokenizerSkipCh(pTokenizer);
657	}
658	else if (ch == ']')
659	{
660	pToken->enmClass = RTJSONTOKENCLASS_END_ARRAY;
661	rtJsonTokenizerSkipCh(pTokenizer);
662	}
663	else if (ch == ':')
664	{
665	pToken->enmClass = RTJSONTOKENCLASS_NAME_SEPARATOR;
666	rtJsonTokenizerSkipCh(pTokenizer);
667	}
668	else if (ch == ',')
669	{
670	pToken->enmClass = RTJSONTOKENCLASS_VALUE_SEPARATOR;
671	rtJsonTokenizerSkipCh(pTokenizer);
672	}
673	else
674	{
675	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
676	rc = VERR_JSON_MALFORMED;
677	}
678
679	return rc;
680	}
681
682	/**
683	* Create a new tokenizer.
684	*
685	* @returns IPRT status code.
686	* @param pTokenizer The tokenizer state to initialize.
687	* @param pfnRead Read callback for the input stream.
688	* @param pvUser Opaque user data to pass to the callback.
689	*/
690	static int rtJsonTokenizerInit(PRTJSONTOKENIZER pTokenizer, PFNRTJSONTOKENIZERREAD pfnRead, void *pvUser)
691	{
692	pTokenizer->pfnRead = pfnRead;
693	pTokenizer->pvUser = pvUser;
694	pTokenizer->offInput = 0;
695	pTokenizer->cbBuf = 0;
696	pTokenizer->offBuf = 0;
697	pTokenizer->Pos.iLine = 1;
698	pTokenizer->Pos.iChStart = 1;
699	pTokenizer->Pos.iChEnd = 1;
700	pTokenizer->pTokenCurr = &pTokenizer->Token1;
701	pTokenizer->pTokenNext = &pTokenizer->Token2;
702
703	RT_ZERO(pTokenizer->achBuf);
704
705	/* Fill the input buffer. */
706	int rc = rtJsonTokenizerRead(pTokenizer);
707
708	/* Fill the tokenizer with two first tokens. */
709	if (RT_SUCCESS(rc))
710	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
711	if (RT_SUCCESS(rc))
712	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
713
714	return rc;
715	}
716
717	/**
718	* Destroys a given tokenizer state.
719	*
720	* @returns nothing.
721	* @param pTokenizer The tokenizer to destroy.
722	*/
723	static void rtJsonTokenizerDestroy(PRTJSONTOKENIZER pTokenizer)
724	{
725
726	}
727
728	/**
729	* Get the current token in the input stream.
730	*
731	* @returns Pointer to the next token in the stream.
732	* @param pTokenizer The tokenizer state.
733	* @param ppToken Where to store the pointer to the current token on success.
734	*/
735	DECLINLINE(int) rtJsonTokenizerGetToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN *ppToken)
736	{
737	*ppToken = pTokenizer->pTokenCurr;
738	return VINF_SUCCESS;
739	}
740
741	/**
742	* Consume the current token advancing to the next in the stream.
743	*
744	* @returns nothing.
745	* @param pTokenizer The tokenizer state.
746	*/
747	static void rtJsonTokenizerConsume(PRTJSONTOKENIZER pTokenizer)
748	{
749	PRTJSONTOKEN pTokenTmp = pTokenizer->pTokenCurr;
750
751	/* Switch next token to current token and read in the next token. */
752	pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
753	pTokenizer->pTokenNext = pTokenTmp;
754	rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
755	}
756
757	/**
758	* Consumes the current token if it matches the given class returning an indicator.
759	*
760	* @returns true if the class matched and the token was consumed.
761	* @retval false otherwise.
762	* @param pTokenizer The tokenizer state.
763	* @param enmClass The token class to match against.
764	*/
765	static bool rtJsonTokenizerConsumeIfMatched(PRTJSONTOKENIZER pTokenizer, RTJSONTOKENCLASS enmClass)
766	{
767	PRTJSONTOKEN pToken = NULL;
768	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
769	AssertRC(rc);
770
771	if (pToken->enmClass == enmClass)
772	{
773	rtJsonTokenizerConsume(pTokenizer);
774	return true;
775	}
776
777	return false;
778	}
779
780	/**
781	* Destroys a given JSON value releasing the reference to all child values.
782	*
783	* @returns nothing.
784	* @param pThis The JSON value to destroy.
785	*/
786	static void rtJsonValDestroy(PRTJSONVALINT pThis)
787	{
788	switch (pThis->enmType)
789	{
790	case RTJSONVALTYPE_OBJECT:
791	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
792	{
793	RTStrFree(pThis->Type.Object.papszNames[i]);
794	RTJsonValueRelease(pThis->Type.Object.papValues[i]);
795	}
796	RTMemFree(pThis->Type.Object.papszNames);
797	RTMemFree(pThis->Type.Object.papValues);
798	break;
799	case RTJSONVALTYPE_ARRAY:
800	for (unsigned i = 0; i < pThis->Type.Array.cItems; i++)
801	RTJsonValueRelease(pThis->Type.Array.papItems[i]);
802	RTMemFree(pThis->Type.Array.papItems);
803	break;
804	case RTJSONVALTYPE_STRING:
805	RTStrFree(pThis->Type.String.pszStr);
806	break;
807	case RTJSONVALTYPE_NUMBER:
808	case RTJSONVALTYPE_NULL:
809	case RTJSONVALTYPE_TRUE:
810	case RTJSONVALTYPE_FALSE:
811	/* nothing to do. */
812	break;
813	default:
814	AssertMsgFailed(("Invalid JSON value type: %u\n", pThis->enmType));
815	}
816	RTMemFree(pThis);
817	}
818
819	/**
820	* Creates a new JSON value with the given type.
821	*
822	* @returns Pointer to JSON value on success, NULL if out of memory.
823	* @param enmType The JSON value type.
824	*/
825	static PRTJSONVALINT rtJsonValueCreate(RTJSONVALTYPE enmType)
826	{
827	PRTJSONVALINT pThis = (PRTJSONVALINT)RTMemAllocZ(sizeof(RTJSONVALINT));
828	if (RT_LIKELY(pThis))
829	{
830	pThis->enmType = enmType;
831	pThis->cRefs = 1;
832	}
833
834	return pThis;
835	}
836
837	/**
838	* Parses an JSON array.
839	*
840	* @returns IPRT status code.
841	* @param pTokenizer The tokenizer to use.
842	* @param pJsonVal The JSON array value to fill in.
843	* @param pErrInfo Where to store extended error info. Optional.
844	*/
845	static int rtJsonParseArray(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
846	{
847	int rc = VINF_SUCCESS;
848	PRTJSONTOKEN pToken = NULL;
849	uint32_t cItems = 0;
850	uint32_t cItemsMax = 0;
851	PRTJSONVALINT *papItems = NULL;
852
853	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
854	while ( RT_SUCCESS(rc)
855	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY
856	&& pToken->enmClass != RTJSONTOKENCLASS_EOS)
857	{
858	PRTJSONVALINT pVal = NULL;
859	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
860	if (RT_SUCCESS(rc))
861	{
862	if (cItems == cItemsMax)
863	{
864	cItemsMax += 10;
865	PRTJSONVALINT papItemsNew = (PRTJSONVALINT )RTMemRealloc(papItems, cItemsMax * sizeof(PRTJSONVALINT));
866	if (RT_UNLIKELY(!papItemsNew))
867	{
868	rc = VERR_NO_MEMORY;
869	break;
870	}
871	papItems = papItemsNew;
872	}
873
874	Assert(cItems < cItemsMax);
875	papItems[cItems] = pVal;
876	cItems++;
877	}
878
879	/* Skip value separator and continue with next token. */
880	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
881	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
882
883	if ( RT_SUCCESS(rc)
884	&& !fSkippedSep
885	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY)
886	rc = VERR_JSON_MALFORMED;
887	}
888
889	if (RT_SUCCESS(rc))
890	{
891	if (pToken->enmClass == RTJSONTOKENCLASS_END_ARRAY)
892	{
893	rtJsonTokenizerConsume(pTokenizer);
894	pJsonVal->Type.Array.cItems = cItems;
895	pJsonVal->Type.Array.papItems = papItems;
896	}
897	else
898	rc = VERR_JSON_MALFORMED;
899	}
900
901	if (RT_FAILURE(rc))
902	{
903	for (uint32_t i = 0; i < cItems; i++)
904	RTJsonValueRelease(papItems[i]);
905	RTMemFree(papItems);
906	}
907
908	return rc;
909	}
910
911	/**
912	* Parses an JSON object.
913	*
914	* @returns IPRT status code.
915	* @param pTokenizer The tokenizer to use.
916	* @param pJsonVal The JSON object value to fill in.
917	* @param pErrInfo Where to store extended error info. Optional.
918	*/
919	static int rtJsonParseObject(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
920	{
921	int rc = VINF_SUCCESS;
922	PRTJSONTOKEN pToken = NULL;
923	uint32_t cMembers = 0;
924	uint32_t cMembersMax = 0;
925	PRTJSONVALINT *papValues = NULL;
926	char **papszNames = NULL;
927
928	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
929	while ( RT_SUCCESS(rc)
930	&& pToken->enmClass == RTJSONTOKENCLASS_STRING)
931	{
932	char *pszName = pToken->Class.String.pszStr;
933
934	rtJsonTokenizerConsume(pTokenizer);
935	if (rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_NAME_SEPARATOR))
936	{
937	PRTJSONVALINT pVal = NULL;
938	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
939	if (RT_SUCCESS(rc))
940	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
941	if (RT_SUCCESS(rc))
942	{
943	if (cMembers == cMembersMax)
944	{
945	cMembersMax += 10;
946	PRTJSONVALINT papValuesNew = (PRTJSONVALINT )RTMemRealloc(papValues, cMembersMax * sizeof(PRTJSONVALINT));
947	char papszNamesNew = (char )RTMemRealloc(papValues, cMembersMax * sizeof(char *));
948	if (RT_UNLIKELY(!papValuesNew \|\| !papszNamesNew))
949	{
950	rc = VERR_NO_MEMORY;
951	break;
952	}
953
954	papValues = papValuesNew;
955	papszNames = papszNamesNew;
956	}
957
958	Assert(cMembers < cMembersMax);
959	papszNames[cMembers] = pszName;
960	papValues[cMembers] = pVal;
961	cMembers++;
962
963	/* Skip value separator and continue with next token. */
964	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
965	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
966
967	if ( RT_SUCCESS(rc)
968	&& !fSkippedSep
969	&& pToken->enmClass != RTJSONTOKENCLASS_END_OBJECT)
970	rc = VERR_JSON_MALFORMED;
971	}
972	}
973	else
974	rc = VERR_JSON_MALFORMED;
975	}
976
977	if (RT_SUCCESS(rc))
978	{
979	if (pToken->enmClass == RTJSONTOKENCLASS_END_OBJECT)
980	{
981	rtJsonTokenizerConsume(pTokenizer);
982	pJsonVal->Type.Object.cMembers = cMembers;
983	pJsonVal->Type.Object.papValues = papValues;
984	pJsonVal->Type.Object.papszNames = papszNames;
985	}
986	else
987	rc = VERR_JSON_MALFORMED;
988	}
989
990	if (RT_FAILURE(rc))
991	{
992	for (uint32_t i = 0; i < cMembers; i++)
993	{
994	RTJsonValueRelease(papValues[i]);
995	RTStrFree(papszNames[i]);
996	}
997	RTMemFree(papValues);
998	RTMemFree(papszNames);
999	}
1000
1001	return rc;
1002	}
1003
1004	/**
1005	* Parses a single JSON value and returns it on success.
1006	*
1007	* @returns IPRT status code.
1008	* @param pTokenizer The tokenizer to use.
1009	* @param pToken The token to parse.
1010	* @param ppJsonVal Where to store the pointer to the JSON value on success.
1011	* @param pErrInfo Where to store extended error info. Optional.
1012	*/
1013	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
1014	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo)
1015	{
1016	int rc = VINF_SUCCESS;
1017	PRTJSONVALINT pVal = NULL;
1018
1019	switch (pToken->enmClass)
1020	{
1021	case RTJSONTOKENCLASS_BEGIN_ARRAY:
1022	rtJsonTokenizerConsume(pTokenizer);
1023	pVal = rtJsonValueCreate(RTJSONVALTYPE_ARRAY);
1024	if (RT_LIKELY(pVal))
1025	rc = rtJsonParseArray(pTokenizer, pVal, pErrInfo);
1026	break;
1027	case RTJSONTOKENCLASS_BEGIN_OBJECT:
1028	rtJsonTokenizerConsume(pTokenizer);
1029	pVal = rtJsonValueCreate(RTJSONVALTYPE_OBJECT);
1030	if (RT_LIKELY(pVal))
1031	rc = rtJsonParseObject(pTokenizer, pVal, pErrInfo);
1032	break;
1033	case RTJSONTOKENCLASS_STRING:
1034	pVal = rtJsonValueCreate(RTJSONVALTYPE_STRING);
1035	if (RT_LIKELY(pVal))
1036	pVal->Type.String.pszStr = pToken->Class.String.pszStr;
1037	rtJsonTokenizerConsume(pTokenizer);
1038	break;
1039	case RTJSONTOKENCLASS_NUMBER:
1040	pVal = rtJsonValueCreate(RTJSONVALTYPE_NUMBER);
1041	if (RT_LIKELY(pVal))
1042	pVal->Type.Number.i64Num = pToken->Class.Number.i64Num;
1043	rtJsonTokenizerConsume(pTokenizer);
1044	break;
1045	case RTJSONTOKENCLASS_NULL:
1046	rtJsonTokenizerConsume(pTokenizer);
1047	pVal = rtJsonValueCreate(RTJSONVALTYPE_NULL);
1048	break;
1049	case RTJSONTOKENCLASS_FALSE:
1050	rtJsonTokenizerConsume(pTokenizer);
1051	pVal = rtJsonValueCreate(RTJSONVALTYPE_FALSE);
1052	break;
1053	case RTJSONTOKENCLASS_TRUE:
1054	rtJsonTokenizerConsume(pTokenizer);
1055	pVal = rtJsonValueCreate(RTJSONVALTYPE_TRUE);
1056	break;
1057	case RTJSONTOKENCLASS_END_ARRAY:
1058	case RTJSONTOKENCLASS_END_OBJECT:
1059	case RTJSONTOKENCLASS_NAME_SEPARATOR:
1060	case RTJSONTOKENCLASS_VALUE_SEPARATOR:
1061	case RTJSONTOKENCLASS_EOS:
1062	default:
1063	/** @todo: Error info */
1064	rc = VERR_JSON_MALFORMED;
1065	break;
1066	}
1067
1068	if (RT_SUCCESS(rc))
1069	{
1070	if (pVal)
1071	*ppJsonVal = pVal;
1072	else
1073	rc = VERR_NO_MEMORY;
1074	}
1075	else if (pVal)
1076	rtJsonValDestroy(pVal);
1077
1078	return rc;
1079	}
1080
1081	/**
1082	* Entry point to parse a JSON document.
1083	*
1084	* @returns IPRT status code.
1085	* @param pTokenizer The tokenizer state.
1086	* @param ppJsonVal Where to store the root JSON value on success.
1087	* @param pErrInfo Where to store extended error info. Optional.
1088	*/
1089	static int rtJsonParse(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT *ppJsonVal,
1090	PRTERRINFO pErrInfo)
1091	{
1092	PRTJSONTOKEN pToken = NULL;
1093	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
1094	if (RT_SUCCESS(rc))
1095	rc = rtJsonParseValue(pTokenizer, pToken, ppJsonVal, pErrInfo);
1096
1097	return rc;
1098	}
1099
1100	/**
1101	* Read callback for RTJsonParseFromBuf().
1102	*/
1103	static DECLCALLBACK(int) rtJsonTokenizerParseFromBuf(void *pvUser, size_t offInput,
1104	void *pvBuf, size_t cbBuf,
1105	size_t *pcbRead)
1106	{
1107	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1108	size_t cbLeft = offInput < pArgs->cbData ? pArgs->cbData - offInput : 0;
1109
1110	if (cbLeft)
1111	memcpy(pvBuf, &pArgs->u.pbBuf[offInput], RT_MIN(cbLeft, cbBuf));
1112
1113	*pcbRead = RT_MIN(cbLeft, cbBuf);
1114
1115	return VINF_SUCCESS;
1116	}
1117
1118	/**
1119	* Read callback for RTJsonParseFromString().
1120	*/
1121	static DECLCALLBACK(int) rtJsonTokenizerParseFromString(void *pvUser, size_t offInput,
1122	void *pvBuf, size_t cbBuf,
1123	size_t *pcbRead)
1124	{
1125	const char pszStr = (const char )pvUser;
1126	size_t cchStr = strlen(pszStr) + 1; /* Include zero terminator. */
1127	size_t cbLeft = offInput < cchStr ? cchStr - offInput : 0;
1128
1129	if (cbLeft)
1130	memcpy(pvBuf, &pszStr[offInput], RT_MIN(cbLeft, cbBuf));
1131
1132	*pcbRead = RT_MIN(cbLeft, cbBuf);
1133
1134	return VINF_SUCCESS;
1135	}
1136
1137	/**
1138	* Read callback for RTJsonParseFromFile().
1139	*/
1140	static DECLCALLBACK(int) rtJsonTokenizerParseFromFile(void *pvUser, size_t offInput,
1141	void *pvBuf, size_t cbBuf,
1142	size_t *pcbRead)
1143	{
1144	int rc = VINF_SUCCESS;
1145	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1146	size_t cbRead = 0;
1147
1148	rc = RTStrmReadEx(pArgs->u.hStream, pvBuf, cbBuf, &cbRead);
1149	if (RT_SUCCESS(rc))
1150	*pcbRead = cbRead;
1151
1152	return rc;
1153	}
1154
1155	RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf,
1156	PRTERRINFO pErrInfo)
1157	{
1158	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1159	AssertPtrReturn(pbBuf, VERR_INVALID_POINTER);
1160	AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
1161
1162	int rc = VINF_SUCCESS;
1163	RTJSONREADERARGS Args;
1164	RTJSONTOKENIZER Tokenizer;
1165
1166	Args.cbData = cbBuf;
1167	Args.u.pbBuf = pbBuf;
1168
1169	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromBuf, &Args);
1170	if (RT_SUCCESS(rc))
1171	{
1172	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1173	rtJsonTokenizerDestroy(&Tokenizer);
1174	}
1175
1176	return rc;
1177	}
1178
1179	RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo)
1180	{
1181	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1182	AssertPtrReturn(pszStr, VERR_INVALID_POINTER);
1183
1184	int rc = VINF_SUCCESS;
1185	RTJSONTOKENIZER Tokenizer;
1186
1187	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromString, (void *)pszStr);
1188	if (RT_SUCCESS(rc))
1189	{
1190	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1191	rtJsonTokenizerDestroy(&Tokenizer);
1192	}
1193
1194	return rc;
1195	}
1196
1197	RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo)
1198	{
1199	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1200	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1201
1202	int rc = VINF_SUCCESS;
1203	RTJSONREADERARGS Args;
1204
1205	Args.cbData = 0;
1206	rc = RTStrmOpen(pszFilename, "r", &Args.u.hStream);
1207	if (RT_SUCCESS(rc))
1208	{
1209	RTJSONTOKENIZER Tokenizer;
1210
1211	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromFile, &Args);
1212	if (RT_SUCCESS(rc))
1213	{
1214	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1215	rtJsonTokenizerDestroy(&Tokenizer);
1216	}
1217	RTStrmClose(Args.u.hStream);
1218	}
1219
1220	return rc;
1221	}
1222
1223	RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal)
1224	{
1225	PRTJSONVALINT pThis = hJsonVal;
1226	AssertPtrReturn(pThis, UINT32_MAX);
1227
1228	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1229	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1230	return cRefs;
1231	}
1232
1233	RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal)
1234	{
1235	PRTJSONVALINT pThis = hJsonVal;
1236	if (pThis == NIL_RTJSONVAL)
1237	return 0;
1238	AssertPtrReturn(pThis, UINT32_MAX);
1239
1240	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1241	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1242	if (cRefs == 0)
1243	rtJsonValDestroy(pThis);
1244	return cRefs;
1245	}
1246
1247	RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal)
1248	{
1249	PRTJSONVALINT pThis = hJsonVal;
1250	if (pThis == NIL_RTJSONVAL)
1251	return RTJSONVALTYPE_INVALID;
1252	AssertPtrReturn(pThis, RTJSONVALTYPE_INVALID);
1253
1254	return pThis->enmType;
1255	}
1256
1257	RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal)
1258	{
1259	PRTJSONVALINT pThis = hJsonVal;
1260	AssertReturn(pThis != NIL_RTJSONVAL, NULL);
1261	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, NULL);
1262
1263	return pThis->Type.String.pszStr;
1264	}
1265
1266	RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr)
1267	{
1268	PRTJSONVALINT pThis = hJsonVal;
1269	AssertPtrReturn(ppszStr, VERR_INVALID_POINTER);
1270	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1271	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, VERR_JSON_VALUE_INVALID_TYPE);
1272
1273	*ppszStr = pThis->Type.String.pszStr;
1274	return VINF_SUCCESS;
1275	}
1276
1277	RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num)
1278	{
1279	PRTJSONVALINT pThis = hJsonVal;
1280	AssertPtrReturn(pi64Num, VERR_INVALID_POINTER);
1281	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1282	AssertReturn(pThis->enmType == RTJSONVALTYPE_NUMBER, VERR_JSON_VALUE_INVALID_TYPE);
1283
1284	*pi64Num = pThis->Type.Number.i64Num;
1285	return VINF_SUCCESS;
1286	}
1287
1288	RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal)
1289	{
1290	PRTJSONVALINT pThis = hJsonVal;
1291	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
1292	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1293	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1294	AssertReturn(pThis->enmType == RTJSONVALTYPE_OBJECT, VERR_JSON_VALUE_INVALID_TYPE);
1295
1296	int rc = VERR_NOT_FOUND;
1297	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
1298	{
1299	if (!RTStrCmp(pThis->Type.Object.papszNames[i], pszName))
1300	{
1301	RTJsonValueRetain(pThis->Type.Object.papValues[i]);
1302	*phJsonVal = pThis->Type.Object.papValues[i];
1303	rc = VINF_SUCCESS;
1304	break;
1305	}
1306	}
1307
1308	return rc;
1309	}
1310
1311	RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char pszName, int64_t pi64Num)
1312	{
1313	RTJSONVAL hJsonValNum = NIL_RTJSONVAL;
1314	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValNum);
1315	if (RT_SUCCESS(rc))
1316	{
1317	rc = RTJsonValueQueryInteger(hJsonValNum, pi64Num);
1318	RTJsonValueRelease(hJsonValNum);
1319	}
1320
1321	return rc;
1322	}
1323
1324	RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char pszName, char *ppszStr)
1325	{
1326	RTJSONVAL hJsonValStr = NIL_RTJSONVAL;
1327	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValStr);
1328	if (RT_SUCCESS(rc))
1329	{
1330	const char *pszStr = NULL;
1331	rc = RTJsonValueQueryString(hJsonValStr, &pszStr);
1332	if (RT_SUCCESS(rc))
1333	{
1334	*ppszStr = RTStrDup(pszStr);
1335	if (!*ppszStr)
1336	rc = VERR_NO_STR_MEMORY;
1337	}
1338	RTJsonValueRelease(hJsonValStr);
1339	}
1340
1341	return rc;
1342	}
1343
1344	RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char pszName, bool pfBoolean)
1345	{
1346	AssertPtrReturn(pfBoolean, VERR_INVALID_POINTER);
1347
1348	RTJSONVAL hJsonValBool = NIL_RTJSONVAL;
1349	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValBool);
1350	if (RT_SUCCESS(rc))
1351	{
1352	RTJSONVALTYPE enmType = RTJsonValueGetType(hJsonValBool);
1353	if (enmType == RTJSONVALTYPE_TRUE)
1354	*pfBoolean = true;
1355	else if (enmType == RTJSONVALTYPE_FALSE)
1356	*pfBoolean = false;
1357	else
1358	rc = VERR_JSON_VALUE_INVALID_TYPE;
1359	RTJsonValueRelease(hJsonValBool);
1360	}
1361
1362	return rc;
1363	}
1364
1365	RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal)
1366	{
1367	PRTJSONVALINT pThis = hJsonVal;
1368	AssertReturn(pThis != NIL_RTJSONVAL, 0);
1369	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, 0);
1370
1371	return pThis->Type.Array.cItems;
1372	}
1373
1374	RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems)
1375	{
1376	PRTJSONVALINT pThis = hJsonVal;
1377	AssertPtrReturn(pcItems, VERR_INVALID_POINTER);
1378	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1379	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1380
1381	*pcItems = pThis->Type.Array.cItems;
1382	return VINF_SUCCESS;
1383	}
1384
1385	RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal)
1386	{
1387	PRTJSONVALINT pThis = hJsonVal;
1388	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1389	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1390	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1391	AssertReturn(idx < pThis->Type.Array.cItems, VERR_OUT_OF_RANGE);
1392
1393	RTJsonValueRetain(pThis->Type.Array.papItems[idx]);
1394	*phJsonVal = pThis->Type.Array.papItems[idx];
1395	return VINF_SUCCESS;
1396	}
1397
1398	RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt)
1399	{
1400	PRTJSONVALINT pThis = hJsonVal;
1401	AssertPtrReturn(phJsonIt, VERR_INVALID_POINTER);
1402	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1403	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY \|\| pThis->enmType == RTJSONVALTYPE_OBJECT,
1404	VERR_JSON_VALUE_INVALID_TYPE);
1405
1406	PRTJSONITINT pIt = (PRTJSONITINT)RTMemTmpAllocZ(sizeof(RTJSONITINT));
1407	if (RT_UNLIKELY(!pIt))
1408	return VERR_NO_MEMORY;
1409
1410	RTJsonValueRetain(hJsonVal);
1411	pIt->pJsonVal = pThis;
1412	pIt->idxCur = 0;
1413	*phJsonIt = pIt;
1414
1415	return VINF_SUCCESS;
1416	}
1417
1418	RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName)
1419	{
1420	PRTJSONITINT pIt = hJsonIt;
1421	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1422	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1423
1424	int rc = VINF_SUCCESS;
1425	PRTJSONVALINT pThis = pIt->pJsonVal;
1426	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1427	{
1428	if (pIt->idxCur < pThis->Type.Array.cItems)
1429	{
1430	if (ppszName)
1431	*ppszName = NULL;
1432
1433	RTJsonValueRetain(pThis->Type.Array.papItems[pIt->idxCur]);
1434	*phJsonVal = pThis->Type.Array.papItems[pIt->idxCur];
1435	}
1436	else
1437	rc = VERR_JSON_ITERATOR_END;
1438	}
1439	else
1440	{
1441	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1442
1443	if (pIt->idxCur < pThis->Type.Object.cMembers)
1444	{
1445	if (ppszName)
1446	*ppszName = pThis->Type.Object.papszNames[pIt->idxCur];
1447
1448	RTJsonValueRetain(pThis->Type.Object.papValues[pIt->idxCur]);
1449	*phJsonVal = pThis->Type.Object.papValues[pIt->idxCur];
1450	}
1451	else
1452	rc = VERR_JSON_ITERATOR_END;
1453	}
1454
1455	return rc;
1456	}
1457
1458	RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt)
1459	{
1460	PRTJSONITINT pIt = hJsonIt;
1461	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1462
1463	int rc = VINF_SUCCESS;
1464	PRTJSONVALINT pThis = pIt->pJsonVal;
1465	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1466	{
1467	if (pIt->idxCur < pThis->Type.Array.cItems)
1468	pIt->idxCur++;
1469
1470	if (pIt->idxCur == pThis->Type.Object.cMembers)
1471	rc = VERR_JSON_ITERATOR_END;
1472	}
1473	else
1474	{
1475	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1476
1477	if (pIt->idxCur < pThis->Type.Object.cMembers)
1478	pIt->idxCur++;
1479
1480	if (pIt->idxCur == pThis->Type.Object.cMembers)
1481	rc = VERR_JSON_ITERATOR_END;
1482	}
1483
1484	return rc;
1485	}
1486
1487	RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt)
1488	{
1489	PRTJSONITINT pThis = hJsonIt;
1490	if (pThis == NIL_RTJSONIT)
1491	return;
1492	AssertPtrReturnVoid(pThis);
1493
1494	RTJsonValueRelease(pThis->pJsonVal);
1495	RTMemTmpFree(pThis);
1496	}
1497

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source: vbox/trunk/src/VBox/Runtime/common/misc/json.cpp@ 62559

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