json.cpp@ 61716

Last change on this file since 61716 was 61716, checked in by vboxsync, 9 years ago
Runtime/JSON: Fixes and start on a testcase
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1	/* $Id: json.cpp 61716 2016-06-15 13:25:52Z 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	* Structures and Typedefs *
42	*********************************************************************************************************************************/
43
44	/**
45	* JSON parser position information.
46	*/
47	typedef struct RTJSONPOS
48	{
49	/** Line in the source. */
50	size_t iLine;
51	/** Current start character .*/
52	size_t iChStart;
53	/** Current end character. */
54	size_t iChEnd;
55	} RTJSONPOS;
56	/** Pointer to a position. */
57	typedef RTJSONPOS *PRTJSONPOS;
58
59	/**
60	* JSON token class.
61	*/
62	typedef enum RTJSONTOKENCLASS
63	{
64	/** Invalid. */
65	RTJSONTOKENCLASS_INVALID = 0,
66	/** Array begin. */
67	RTJSONTOKENCLASS_BEGIN_ARRAY,
68	/** Object begin. */
69	RTJSONTOKENCLASS_BEGIN_OBJECT,
70	/** Array end. */
71	RTJSONTOKENCLASS_END_ARRAY,
72	/** Object end. */
73	RTJSONTOKENCLASS_END_OBJECT,
74	/** Separator for name/value pairs. */
75	RTJSONTOKENCLASS_NAME_SEPARATOR,
76	/** Value separator. */
77	RTJSONTOKENCLASS_VALUE_SEPARATOR,
78	/** String */
79	RTJSONTOKENCLASS_STRING,
80	/** Number. */
81	RTJSONTOKENCLASS_NUMBER,
82	/** null keyword. */
83	RTJSONTOKENCLASS_NULL,
84	/** false keyword. */
85	RTJSONTOKENCLASS_FALSE,
86	/** true keyword. */
87	RTJSONTOKENCLASS_TRUE,
88	/** End of stream */
89	RTJSONTOKENCLASS_EOS,
90	/** 32bit hack. */
91	RTJSONTOKENCLASS_32BIT_HACK = 0x7fffffff
92	} RTJSONTOKENCLASS;
93	/** Pointer to a token class. */
94	typedef RTJSONTOKENCLASS *PRTJSONTOKENCLASS;
95
96	/**
97	* JSON token.
98	*/
99	typedef struct RTJSONTOKEN
100	{
101	/** Token class. */
102	RTJSONTOKENCLASS enmClass;
103	/** Token position in the source buffer. */
104	RTJSONPOS Pos;
105	/** Data based on the token class. */
106	union
107	{
108	/** String. */
109	struct
110	{
111	/** Pointer to the start of the string. */
112	char *pszStr;
113	} String;
114	/** Number. */
115	struct
116	{
117	int64_t i64Num;
118	} Number;
119	} Class;
120	} RTJSONTOKEN;
121	/** Pointer to a JSON token. */
122	typedef RTJSONTOKEN *PRTJSONTOKEN;
123	/** Pointer to a const script token. */
124	typedef const RTJSONTOKEN *PCRTJSONTOKEN;
125
126	/**
127	* Tokenizer read input callback.
128	*
129	* @returns IPRT status code.
130	* @param pvUser Opaque user data for the callee.
131	* @param offInput Start offset from the start of the input stream to read from.
132	* @param pvBuf Where to store the read data.
133	* @param cbBuf How much to read.
134	* @param pcbRead Where to store the amount of data read on succcess.
135	*/
136	typedef DECLCALLBACK(int) FNRTJSONTOKENIZERREAD(void pvUser, size_t offInput, void pvBuf, size_t cbBuf,
137	size_t *pcbRead);
138	/** Pointer to a tokenizer read buffer callback. */
139	typedef FNRTJSONTOKENIZERREAD *PFNRTJSONTOKENIZERREAD;
140
141	/**
142	* Tokenizer state.
143	*/
144	typedef struct RTJSONTOKENIZER
145	{
146	/** Read callback. */
147	PFNRTJSONTOKENIZERREAD pfnRead;
148	/** Opaque user data. */
149	void *pvUser;
150	/** Current offset into the input stream. */
151	size_t offInput;
152	/** Number of valid bytes in the input buffer. */
153	size_t cbBuf;
154	/* Current offset into the input buffer. */
155	size_t offBuf;
156	/** Input cache buffer. */
157	char achBuf[512];
158	/** Current position into the input stream. */
159	RTJSONPOS Pos;
160	/** Token 1. */
161	RTJSONTOKEN Token1;
162	/** Token 2. */
163	RTJSONTOKEN Token2;
164	/** Pointer to the current active token. */
165	PRTJSONTOKEN pTokenCurr;
166	/** The next token in the input stream (used for peeking). */
167	PRTJSONTOKEN pTokenNext;
168	} RTJSONTOKENIZER;
169	/** Pointer to a JSON tokenizer. */
170	typedef RTJSONTOKENIZER *PRTJSONTOKENIZER;
171
172	/** Pointer to the internal JSON value instance. */
173	typedef struct RTJSONVALINT *PRTJSONVALINT;
174
175	/**
176	* A JSON value.
177	*/
178	typedef struct RTJSONVALINT
179	{
180	/** Type of the JSON value. */
181	RTJSONVALTYPE enmType;
182	/** Reference count for this JSON value. */
183	volatile uint32_t cRefs;
184	/** Type dependent data. */
185	union
186	{
187	/** String type*/
188	struct
189	{
190	/** Pointer to the string. */
191	char *pszStr;
192	} String;
193	/** Number type. */
194	struct
195	{
196	/** Signed 64-bit integer. */
197	int64_t i64Num;
198	} Number;
199	/** Array type. */
200	struct
201	{
202	/** Number of elements in the array. */
203	uint32_t cItems;
204	/** Pointer to the array of items. */
205	PRTJSONVALINT *papItems;
206	} Array;
207	/** Object type. */
208	struct
209	{
210	/** Number of members. */
211	uint32_t cMembers;
212	/** Pointer to the array holding the member names. */
213	char **papszNames;
214	/** Pointer to the array holding the values. */
215	PRTJSONVALINT *papValues;
216	} Object;
217	} Type;
218	} RTJSONVALINT;
219
220	/**
221	* A JSON iterator.
222	*/
223	typedef struct RTJSONITINT
224	{
225	/** Referenced JSON value. */
226	PRTJSONVALINT pJsonVal;
227	/** Current index. */
228	unsigned idxCur;
229	} RTJSONITINT;
230	/** Pointer to the internal JSON iterator instance. */
231	typedef RTJSONITINT *PRTJSONITINT;
232
233	/**
234	* Passing arguments for the read callbacks.
235	*/
236	typedef struct RTJSONREADERARGS
237	{
238	/** Buffer/File size */
239	size_t cbData;
240	/** Data specific for one callback. */
241	union
242	{
243	PRTSTREAM hStream;
244	const uint8_t *pbBuf;
245	} u;
246	} RTJSONREADERARGS;
247	/** Pointer to a readers argument. */
248	typedef RTJSONREADERARGS *PRTJSONREADERARGS;
249
250	/*********************************************************************************************************************************
251	* Global variables *
252	*********************************************************************************************************************************/
253
254	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
255	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo);
256
257	/**
258	* Fill the input buffer from the input stream.
259	*
260	* @returns IPRT status code.
261	* @param pTokenizer The tokenizer state.
262	*/
263	static int rtJsonTokenizerRead(PRTJSONTOKENIZER pTokenizer)
264	{
265	size_t cbRead = 0;
266	int rc = pTokenizer->pfnRead(pTokenizer->pvUser, pTokenizer->offInput, &pTokenizer->achBuf[0],
267	sizeof(pTokenizer->achBuf), &cbRead);
268	if (RT_SUCCESS(rc))
269	{
270	pTokenizer->cbBuf = cbRead;
271	pTokenizer->offInput += cbRead;
272	pTokenizer->offBuf = 0;
273	/* Validate UTF-8 encoding. */
274	rc = RTStrValidateEncodingEx(&pTokenizer->achBuf[0], cbRead, 0 /* fFlags */);
275	/* If we read less than requested we reached the end and fill the remainder with terminators. */
276	if (cbRead < sizeof(pTokenizer->achBuf))
277	memset(&pTokenizer->achBuf[cbRead], 0, sizeof(pTokenizer->achBuf) - cbRead);
278	}
279
280	return rc;
281	}
282
283	/**
284	* Skips the given amount of characters in the input stream.
285	*
286	* @returns IPRT status code.
287	* @param pTokenizer The tokenizer state.
288	* @param cchSkip The amount of characters to skip.
289	*/
290	static int rtJsonTokenizerSkip(PRTJSONTOKENIZER pTokenizer, size_t cchSkip)
291	{
292	int rc = VINF_SUCCESS;
293
294	/*
295	* In case we reached the end of the stream don't even attempt to read new data.
296	* Safety precaution for possible bugs in the parser causing out of bounds reads
297	*/
298	if (pTokenizer->achBuf[pTokenizer->offBuf] == '\0')
299	return rc;
300
301	while ( cchSkip > 0
302	&& pTokenizer->offBuf < pTokenizer->cbBuf
303	&& RT_SUCCESS(rc))
304	{
305	size_t cchThisSkip = RT_MIN(cchSkip, pTokenizer->cbBuf - pTokenizer->offBuf);
306
307	pTokenizer->offBuf += cchThisSkip;
308	/* Read new data if required and we didn't reach the end yet. */
309	if ( pTokenizer->offBuf == pTokenizer->cbBuf
310	&& pTokenizer->cbBuf == sizeof(pTokenizer->achBuf))
311	rc = rtJsonTokenizerRead(pTokenizer);
312
313	cchSkip -= cchThisSkip;
314	}
315
316	return rc;
317	}
318
319
320	/**
321	* Returns whether the tokenizer reached the end of the stream.
322	*
323	* @returns true if the tokenizer reached the end of stream marker
324	* false otherwise.
325	* @param pTokenizer The tokenizer state.
326	*/
327	DECLINLINE(bool) rtJsonTokenizerIsEos(PRTJSONTOKENIZER pTokenizer)
328	{
329	return pTokenizer->achBuf[pTokenizer->offBuf] == '\0';
330	}
331
332	/**
333	* Skip one character in the input stream.
334	*
335	* @returns nothing.
336	* @param pTokenizer The tokenizer state.
337	*/
338	DECLINLINE(void) rtJsonTokenizerSkipCh(PRTJSONTOKENIZER pTokenizer)
339	{
340	rtJsonTokenizerSkip(pTokenizer, 1);
341	pTokenizer->Pos.iChStart++;
342	pTokenizer->Pos.iChEnd++;
343	}
344
345	/**
346	* Returns the next char in the input buffer without advancing it.
347	*
348	* @returns Next character in the input buffer.
349	* @param pTokenizer The tokenizer state.
350	*/
351	DECLINLINE(char) rtJsonTokenizerPeekCh(PRTJSONTOKENIZER pTokenizer)
352	{
353	return rtJsonTokenizerIsEos(pTokenizer)
354	? '\0'
355	: pTokenizer->achBuf[pTokenizer->offBuf + 1]; /** @todo: Read out of bounds */
356	}
357
358	/**
359	* Returns the next character in the input buffer advancing the internal
360	* position.
361	*
362	* @returns Next character in the stream.
363	* @param pTokenizer The tokenizer state.
364	*/
365	DECLINLINE(char) rtJsonTokenizerGetCh(PRTJSONTOKENIZER pTokenizer)
366	{
367	char ch;
368
369	if (rtJsonTokenizerIsEos(pTokenizer))
370	ch = '\0';
371	else
372	ch = pTokenizer->achBuf[pTokenizer->offBuf];
373
374	return ch;
375	}
376
377	/**
378	* Sets a new line for the tokenizer.
379	*
380	* @returns nothing.
381	* @param pTokenizer The tokenizer state.
382	*/
383	DECLINLINE(void) rtJsonTokenizerNewLine(PRTJSONTOKENIZER pTokenizer, unsigned cSkip)
384	{
385	rtJsonTokenizerSkip(pTokenizer, cSkip);
386	pTokenizer->Pos.iLine++;
387	pTokenizer->Pos.iChStart = 1;
388	pTokenizer->Pos.iChEnd = 1;
389	}
390
391	/**
392	* Checks whether the current position in the input stream is a new line
393	* and skips it.
394	*
395	* @returns Flag whether there was a new line at the current position
396	* in the input buffer.
397	* @param pTokenizer The tokenizer state.
398	*/
399	DECLINLINE(bool) rtJsonTokenizerIsSkipNewLine(PRTJSONTOKENIZER pTokenizer)
400	{
401	bool fNewline = true;
402
403	if ( rtJsonTokenizerGetCh(pTokenizer) == '\r'
404	&& rtJsonTokenizerPeekCh(pTokenizer) == '\n')
405	rtJsonTokenizerNewLine(pTokenizer, 2);
406	else if (rtJsonTokenizerGetCh(pTokenizer) == '\n')
407	rtJsonTokenizerNewLine(pTokenizer, 1);
408	else
409	fNewline = false;
410
411	return fNewline;
412	}
413
414	/**
415	* Skip all whitespace starting from the current input buffer position.
416	* Skips all present comments too.
417	*
418	* @returns nothing.
419	* @param pTokenizer The tokenizer state.
420	*/
421	DECLINLINE(void) rtJsonTokenizerSkipWhitespace(PRTJSONTOKENIZER pTokenizer)
422	{
423	while (!rtJsonTokenizerIsEos(pTokenizer))
424	{
425	while ( rtJsonTokenizerGetCh(pTokenizer) == ' '
426	\|\| rtJsonTokenizerGetCh(pTokenizer) == '\t')
427	rtJsonTokenizerSkipCh(pTokenizer);
428
429	if ( !rtJsonTokenizerIsEos(pTokenizer)
430	&& !rtJsonTokenizerIsSkipNewLine(pTokenizer))
431	{
432	break; /* Skipped everything, next is some real content. */
433	}
434	}
435	}
436
437	/**
438	* Get an literal token from the tokenizer.
439	*
440	* @returns IPRT status code.
441	* @param pTokenizer The tokenizer state.
442	* @param pToken The uninitialized token.
443	*/
444	static int rtJsonTokenizerGetLiteral(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
445	{
446	int rc = VINF_SUCCESS;
447	char ch = rtJsonTokenizerGetCh(pTokenizer);
448	size_t cchLiteral = 0;
449	char aszLiteral[6]; /* false + 0 terminator as the lingest possible literal. */
450	RT_ZERO(aszLiteral);
451
452	pToken->Pos = pTokenizer->Pos;
453
454	Assert(RT_C_IS_ALPHA(ch));
455
456	while ( RT_C_IS_ALPHA(ch)
457	&& cchLiteral < RT_ELEMENTS(aszLiteral) - 1)
458	{
459	aszLiteral[cchLiteral] = ch;
460	cchLiteral++;
461	rtJsonTokenizerSkipCh(pTokenizer);
462	ch = rtJsonTokenizerGetCh(pTokenizer);
463	}
464
465	if (!RTStrNCmp(&aszLiteral[0], "false", RT_ELEMENTS(aszLiteral)))
466	pToken->enmClass = RTJSONTOKENCLASS_FALSE;
467	else if (!RTStrNCmp(&aszLiteral[0], "true", RT_ELEMENTS(aszLiteral)))
468	pToken->enmClass = RTJSONTOKENCLASS_TRUE;
469	else if (!RTStrNCmp(&aszLiteral[0], "null", RT_ELEMENTS(aszLiteral)))
470	pToken->enmClass = RTJSONTOKENCLASS_NULL;
471	else
472	{
473	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
474	rc = VERR_JSON_MALFORMED;
475	}
476
477	pToken->Pos.iChEnd += cchLiteral;
478	return rc;
479	}
480
481	/**
482	* Get a numerical constant from the tokenizer.
483	*
484	* @returns IPRT status code.
485	* @param pTokenizer The tokenizer state.
486	* @param pToken The uninitialized token.
487	*/
488	static int rtJsonTokenizerGetNumber(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
489	{
490	unsigned uBase = 10;
491	char *pszNext = NULL;
492	size_t cchNum = 0;
493	char aszTmp[128]; /* Everything larger is not possible to display in signed 64bit. */
494	RT_ZERO(aszTmp);
495
496	pToken->enmClass = RTJSONTOKENCLASS_NUMBER;
497
498	char ch = rtJsonTokenizerGetCh(pTokenizer);
499	while ( RT_C_IS_DIGIT(ch)
500	&& cchNum < sizeof(aszTmp) - 1)
501	{
502	aszTmp[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(aszTmp) - 1)
510	rc = VERR_NUMBER_TOO_BIG;
511	else
512	{
513	rc = RTStrToInt64Ex(&aszTmp[0], NULL, 0, &pToken->Class.Number.i64Num);
514	Assert(RT_SUCCESS(rc) \|\| rc == VWRN_NUMBER_TOO_BIG);
515	if (rc == VWRN_NUMBER_TOO_BIG)
516	rc = VERR_NUMBER_TOO_BIG;
517	}
518
519	return rc;
520	}
521
522	/**
523	* Parses a string constant.
524	*
525	* @returns IPRT status code.
526	* @param pTokenizer The tokenizer state.
527	* @param pToken The uninitialized token.
528	*/
529	static int rtJsonTokenizerGetString(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
530	{
531	int rc = VINF_SUCCESS;
532	size_t cchStr = 0;
533	char aszTmp[_4K];
534	RT_ZERO(aszTmp);
535
536	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\"');
537	rtJsonTokenizerSkipCh(pTokenizer); /* Skip " */
538
539	pToken->enmClass = RTJSONTOKENCLASS_STRING;
540	pToken->Pos = pTokenizer->Pos;
541
542	char ch = rtJsonTokenizerGetCh(pTokenizer);
543	while ( ch != '\"'
544	&& ch != '\0'
545	&& cchStr < sizeof(aszTmp) - 1)
546	{
547	if (ch == '\\')
548	{
549	/* Escape sequence, check the next character */
550	rtJsonTokenizerSkipCh(pTokenizer);
551	char chNext = rtJsonTokenizerGetCh(pTokenizer);
552	switch (chNext)
553	{
554	case '\"':
555	aszTmp[cchStr] = '\"';
556	break;
557	case '\\':
558	aszTmp[cchStr] = '\\';
559	break;
560	case '/':
561	aszTmp[cchStr] = '/';
562	break;
563	case '\b':
564	aszTmp[cchStr] = '\b';
565	break;
566	case '\n':
567	aszTmp[cchStr] = '\n';
568	break;
569	case '\f':
570	aszTmp[cchStr] = '\f';
571	break;
572	case '\r':
573	aszTmp[cchStr] = '\r';
574	break;
575	case '\t':
576	aszTmp[cchStr] = '\t';
577	break;
578	case 'u':
579	rc = VERR_NOT_SUPPORTED;
580	break;
581	default:
582	rc = VERR_JSON_MALFORMED;
583	}
584	}
585	else
586	aszTmp[cchStr] = ch;
587	cchStr++;
588	rtJsonTokenizerSkipCh(pTokenizer);
589	ch = rtJsonTokenizerGetCh(pTokenizer);
590	}
591
592	if (rtJsonTokenizerGetCh(pTokenizer) == '\"')
593	rtJsonTokenizerSkipCh(pTokenizer); /* Skip closing " */
594
595	pToken->Class.String.pszStr = RTStrDupN(&aszTmp[0], cchStr);
596	if (pToken->Class.String.pszStr)
597	pToken->Pos.iChEnd += cchStr;
598	else
599	rc = VERR_NO_STR_MEMORY;
600	return rc;
601	}
602
603	/**
604	* Get the end of stream token.
605	*
606	* @returns IPRT status code.
607	* @param pTokenizer The tokenizer state.
608	* @param pToken The uninitialized token.
609	*/
610	static int rtJsonTokenizerGetEos(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
611	{
612	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\0');
613
614	pToken->enmClass = RTJSONTOKENCLASS_EOS;
615	pToken->Pos = pTokenizer->Pos;
616	return VINF_SUCCESS;
617	}
618
619	/**
620	* Read the next token from the tokenizer stream.
621	*
622	* @returns IPRT status code.
623	* @param pTokenizer The tokenizer to read from.
624	* @param pToken Uninitialized token to fill the token data into.
625	*/
626	static int rtJsonTokenizerReadNextToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
627	{
628	int rc = VINF_SUCCESS;
629
630	/* Skip all eventually existing whitespace and newlines first. */
631	rtJsonTokenizerSkipWhitespace(pTokenizer);
632
633	char ch = rtJsonTokenizerGetCh(pTokenizer);
634	if (RT_C_IS_ALPHA(ch))
635	rc = rtJsonTokenizerGetLiteral(pTokenizer, pToken);
636	else if (RT_C_IS_DIGIT(ch))
637	rc = rtJsonTokenizerGetNumber(pTokenizer, pToken);
638	else if (ch == '\"')
639	rc = rtJsonTokenizerGetString(pTokenizer, pToken);
640	else if (ch == '\0')
641	rc = rtJsonTokenizerGetEos(pTokenizer, pToken);
642	else if (ch == '{')
643	{
644	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_OBJECT;
645	rtJsonTokenizerSkipCh(pTokenizer);
646	}
647	else if (ch == '}')
648	{
649	pToken->enmClass = RTJSONTOKENCLASS_END_OBJECT;
650	rtJsonTokenizerSkipCh(pTokenizer);
651	}
652	else if (ch == '[')
653	{
654	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_ARRAY;
655	rtJsonTokenizerSkipCh(pTokenizer);
656	}
657	else if (ch == ']')
658	{
659	pToken->enmClass = RTJSONTOKENCLASS_END_ARRAY;
660	rtJsonTokenizerSkipCh(pTokenizer);
661	}
662	else if (ch == ':')
663	{
664	pToken->enmClass = RTJSONTOKENCLASS_NAME_SEPARATOR;
665	rtJsonTokenizerSkipCh(pTokenizer);
666	}
667	else if (ch == ',')
668	{
669	pToken->enmClass = RTJSONTOKENCLASS_VALUE_SEPARATOR;
670	rtJsonTokenizerSkipCh(pTokenizer);
671	}
672	else
673	{
674	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
675	rc = VERR_JSON_MALFORMED;
676	}
677
678	return rc;
679	}
680
681	/**
682	* Create a new tokenizer.
683	*
684	* @returns IPRT status code.
685	* @param pTokenizer The tokenizer state to initialize.
686	* @param pfnRead Read callback for the input stream.
687	* @param pvUser Opaque user data to pass to the callback.
688	*/
689	static int rtJsonTokenizerInit(PRTJSONTOKENIZER pTokenizer, PFNRTJSONTOKENIZERREAD pfnRead, void *pvUser)
690	{
691	pTokenizer->pfnRead = pfnRead;
692	pTokenizer->pvUser = pvUser;
693	pTokenizer->offInput = 0;
694	pTokenizer->cbBuf = 0;
695	pTokenizer->offBuf = 0;
696	pTokenizer->Pos.iLine = 1;
697	pTokenizer->Pos.iChStart = 1;
698	pTokenizer->Pos.iChEnd = 1;
699	pTokenizer->pTokenCurr = &pTokenizer->Token1;
700	pTokenizer->pTokenNext = &pTokenizer->Token2;
701
702	RT_ZERO(pTokenizer->achBuf);
703
704	/* Fill the input buffer. */
705	int rc = rtJsonTokenizerRead(pTokenizer);
706
707	/* Fill the tokenizer with two first tokens. */
708	if (RT_SUCCESS(rc))
709	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
710	if (RT_SUCCESS(rc))
711	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
712
713	return rc;
714	}
715
716	/**
717	* Destroys a given tokenizer state.
718	*
719	* @returns nothing.
720	* @param pTokenizer The tokenizer to destroy.
721	*/
722	static void rtJsonTokenizerDestroy(PRTJSONTOKENIZER pTokenizer)
723	{
724
725	}
726
727	/**
728	* Get the current token in the input stream.
729	*
730	* @returns Pointer to the next token in the stream.
731	* @param pTokenizer The tokenizer state.
732	* @param ppToken Where to store the pointer to the current token on success.
733	*/
734	DECLINLINE(int) rtJsonTokenizerGetToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN *ppToken)
735	{
736	*ppToken = pTokenizer->pTokenCurr;
737	return VINF_SUCCESS;
738	}
739
740	/**
741	* Consume the current token advancing to the next in the stream.
742	*
743	* @returns nothing.
744	* @param pTokenizer The tokenizer state.
745	*/
746	static void rtJsonTokenizerConsume(PRTJSONTOKENIZER pTokenizer)
747	{
748	PRTJSONTOKEN pTokenTmp = pTokenizer->pTokenCurr;
749
750	/* Switch next token to current token and read in the next token. */
751	pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
752	pTokenizer->pTokenNext = pTokenTmp;
753	rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
754	}
755
756	/**
757	* Consumes the current token if it matches the given class returning an indicator.
758	*
759	* @returns true if the class matched and the token was consumed.
760	* @param false otherwise.
761	* @param pTokenizer The tokenizer state.
762	* @param enmClass The token class to match against.
763	*/
764	static bool rtJsonTokenizerConsumeIfMatched(PRTJSONTOKENIZER pTokenizer, RTJSONTOKENCLASS enmClass)
765	{
766	PRTJSONTOKEN pToken = NULL;
767	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
768	AssertRC(rc);
769
770	if (pToken->enmClass == enmClass)
771	{
772	rtJsonTokenizerConsume(pTokenizer);
773	return true;
774	}
775
776	return false;
777	}
778
779	/**
780	* Destroys a given JSON value releasing the reference to all child values.
781	*
782	* @returns nothing.
783	* @param pThis The JSON value to destroy.
784	*/
785	static void rtJsonValDestroy(PRTJSONVALINT pThis)
786	{
787	switch (pThis->enmType)
788	{
789	case RTJSONVALTYPE_OBJECT:
790	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
791	{
792	RTStrFree(pThis->Type.Object.papszNames[i]);
793	RTJsonValueRelease(pThis->Type.Object.papValues[i]);
794	}
795	RTMemFree(pThis->Type.Object.papszNames);
796	RTMemFree(pThis->Type.Object.papValues);
797	break;
798	case RTJSONVALTYPE_ARRAY:
799	for (unsigned i = 0; i < pThis->Type.Array.cItems; i++)
800	RTJsonValueRelease(pThis->Type.Array.papItems[i]);
801	RTMemFree(pThis->Type.Array.papItems);
802	break;
803	case RTJSONVALTYPE_STRING:
804	RTStrFree(pThis->Type.String.pszStr);
805	break;
806	case RTJSONVALTYPE_NUMBER:
807	case RTJSONVALTYPE_NULL:
808	case RTJSONVALTYPE_TRUE:
809	case RTJSONVALTYPE_FALSE:
810	/* nothing to do. */
811	break;
812	default:
813	AssertMsgFailed(("Invalid JSON value type: %u\n", pThis->enmType));
814	}
815	RTMemFree(pThis);
816	}
817
818	/**
819	* Creates a new JSON value with the given type.
820	*
821	* @returns Pointer to JSON value on success, NULL if out of memory.
822	* @param enmType The JSON value type.
823	*/
824	static PRTJSONVALINT rtJsonValueCreate(RTJSONVALTYPE enmType)
825	{
826	PRTJSONVALINT pThis = (PRTJSONVALINT)RTMemAllocZ(sizeof(RTJSONVALINT));
827	if (RT_LIKELY(pThis))
828	{
829	pThis->enmType = enmType;
830	pThis->cRefs = 1;
831	}
832
833	return pThis;
834	}
835
836	/**
837	* Parses an JSON array.
838	*
839	* @returns IPRT status code.
840	* @param pTokenizer The tokenizer to use.
841	* @param pVal The JSON array value to fill in.
842	* @param pErrInfo Where to store extended error info. Optional.
843	*/
844	static int rtJsonParseArray(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
845	{
846	int rc = VINF_SUCCESS;
847	PRTJSONTOKEN pToken = NULL;
848	uint32_t cItems = 0;
849	uint32_t cItemsMax = 0;
850	PRTJSONVALINT *papItems = NULL;
851
852	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
853	while ( RT_SUCCESS(rc)
854	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY
855	&& pToken->enmClass != RTJSONTOKENCLASS_EOS)
856	{
857	PRTJSONVALINT pVal = NULL;
858	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
859	if (RT_SUCCESS(rc))
860	{
861	if (cItems == cItemsMax)
862	{
863	cItemsMax += 10;
864	PRTJSONVALINT papItemsNew = (PRTJSONVALINT )RTMemRealloc(papItems, cItemsMax * sizeof(PRTJSONVALINT));
865	if (RT_UNLIKELY(!papItemsNew))
866	{
867	rc = VERR_NO_MEMORY;
868	break;
869	}
870	papItems = papItemsNew;
871	}
872
873	Assert(cItems < cItemsMax);
874	papItems[cItems] = pVal;
875	cItems++;
876	}
877
878	/* Skip value separator and continue with next token. */
879	if (rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR))
880	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
881	else
882	rc = VERR_JSON_MALFORMED;
883	}
884
885	if (RT_SUCCESS(rc))
886	{
887	if (pToken->enmClass == RTJSONTOKENCLASS_END_ARRAY)
888	{
889	rtJsonTokenizerConsume(pTokenizer);
890	pJsonVal->Type.Array.cItems = cItems;
891	pJsonVal->Type.Array.papItems = papItems;
892	}
893	else
894	rc = VERR_JSON_MALFORMED;
895	}
896
897	if (RT_FAILURE(rc))
898	{
899	for (uint32_t i = 0; i < cItems; i++)
900	RTJsonValueRelease(papItems[i]);
901	RTMemFree(papItems);
902	}
903
904	return rc;
905	}
906
907	/**
908	* Parses an JSON object.
909	*
910	* @returns IPRT status code.
911	* @param pTokenizer The tokenizer to use.
912	* @param pVal The JSON object value to fill in.
913	* @param pErrInfo Where to store extended error info. Optional.
914	*/
915	static int rtJsonParseObject(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
916	{
917	int rc = VINF_SUCCESS;
918	PRTJSONTOKEN pToken = NULL;
919	uint32_t cMembers = 0;
920	uint32_t cMembersMax = 0;
921	PRTJSONVALINT *papValues = NULL;
922	char **papszNames = NULL;
923
924	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
925	while ( RT_SUCCESS(rc)
926	&& pToken->enmClass == RTJSONTOKENCLASS_STRING)
927	{
928	char *pszName = pToken->Class.String.pszStr;
929
930	rtJsonTokenizerConsume(pTokenizer);
931	if (rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_NAME_SEPARATOR))
932	{
933	PRTJSONVALINT pVal = NULL;
934	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
935	if (RT_SUCCESS(rc))
936	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
937	if (RT_SUCCESS(rc))
938	{
939	if (cMembers == cMembersMax)
940	{
941	cMembersMax += 10;
942	PRTJSONVALINT papValuesNew = (PRTJSONVALINT )RTMemRealloc(papValues, cMembersMax * sizeof(PRTJSONVALINT));
943	char papszNamesNew = (char )RTMemRealloc(papValues, cMembersMax * sizeof(char *));
944	if (RT_UNLIKELY(!papValuesNew \|\| !papszNamesNew))
945	{
946	rc = VERR_NO_MEMORY;
947	break;
948	}
949	}
950
951	Assert(cMembers < cMembers);
952	papszNames[cMembers] = pszName;
953	papValues[cMembers] = pVal;
954	cMembers++;
955
956	/* Next token. */
957	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
958	}
959	}
960	else
961	rc = VERR_JSON_MALFORMED;
962	}
963
964	if (RT_SUCCESS(rc))
965	{
966	if (pToken->enmClass == RTJSONTOKENCLASS_END_OBJECT)
967	{
968	rtJsonTokenizerConsume(pTokenizer);
969	pJsonVal->Type.Object.cMembers = cMembers;
970	pJsonVal->Type.Object.papValues = papValues;
971	pJsonVal->Type.Object.papszNames = papszNames;
972	}
973	else
974	rc = VERR_JSON_MALFORMED;
975	}
976
977	if (RT_FAILURE(rc))
978	{
979	for (uint32_t i = 0; i < cMembers; i++)
980	{
981	RTJsonValueRelease(papValues[i]);
982	RTStrFree(papszNames[i]);
983	}
984	RTMemFree(papValues);
985	RTMemFree(papszNames);
986	}
987
988	return rc;
989	}
990
991	/**
992	* Parses a single JSON value and returns it on success.
993	*
994	* @returns IPRT status code.
995	* @param pTokenizer The tokenizer to use.
996	* @param pToken The token to parse.
997	* @param ppJsonVal Where to store the pointer to the JSON value on success.
998	* @param pErrInfo Where to store extended error info. Optional.
999	*/
1000	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
1001	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo)
1002	{
1003	int rc = VINF_SUCCESS;
1004	PRTJSONVALINT pVal = NULL;
1005
1006	switch (pToken->enmClass)
1007	{
1008	case RTJSONTOKENCLASS_BEGIN_ARRAY:
1009	rtJsonTokenizerConsume(pTokenizer);
1010	pVal = rtJsonValueCreate(RTJSONVALTYPE_ARRAY);
1011	if (RT_LIKELY(pVal))
1012	rc = rtJsonParseArray(pTokenizer, pVal, pErrInfo);
1013	break;
1014	case RTJSONTOKENCLASS_BEGIN_OBJECT:
1015	rtJsonTokenizerConsume(pTokenizer);
1016	pVal = rtJsonValueCreate(RTJSONVALTYPE_OBJECT);
1017	if (RT_LIKELY(pVal))
1018	rc = rtJsonParseObject(pTokenizer, pVal, pErrInfo);
1019	break;
1020	case RTJSONTOKENCLASS_STRING:
1021	pVal = rtJsonValueCreate(RTJSONVALTYPE_STRING);
1022	if (RT_LIKELY(pVal))
1023	pVal->Type.String.pszStr = pToken->Class.String.pszStr;
1024	rtJsonTokenizerConsume(pTokenizer);
1025	break;
1026	case RTJSONTOKENCLASS_NUMBER:
1027	pVal = rtJsonValueCreate(RTJSONVALTYPE_NUMBER);
1028	if (RT_LIKELY(pVal))
1029	pVal->Type.Number.i64Num = pToken->Class.Number.i64Num;
1030	rtJsonTokenizerConsume(pTokenizer);
1031	break;
1032	case RTJSONTOKENCLASS_NULL:
1033	rtJsonTokenizerConsume(pTokenizer);
1034	pVal = rtJsonValueCreate(RTJSONVALTYPE_NULL);
1035	break;
1036	case RTJSONTOKENCLASS_FALSE:
1037	rtJsonTokenizerConsume(pTokenizer);
1038	pVal = rtJsonValueCreate(RTJSONVALTYPE_FALSE);
1039	break;
1040	case RTJSONTOKENCLASS_TRUE:
1041	rtJsonTokenizerConsume(pTokenizer);
1042	pVal = rtJsonValueCreate(RTJSONVALTYPE_TRUE);
1043	break;
1044	case RTJSONTOKENCLASS_END_ARRAY:
1045	case RTJSONTOKENCLASS_END_OBJECT:
1046	case RTJSONTOKENCLASS_NAME_SEPARATOR:
1047	case RTJSONTOKENCLASS_VALUE_SEPARATOR:
1048	case RTJSONTOKENCLASS_EOS:
1049	default:
1050	/** @todo: Error info */
1051	rc = VERR_JSON_MALFORMED;
1052	break;
1053	}
1054
1055	if (RT_SUCCESS(rc))
1056	{
1057	if (pVal)
1058	*ppJsonVal = pVal;
1059	else
1060	rc = VERR_NO_MEMORY;
1061	}
1062	else if (pVal)
1063	rtJsonValDestroy(pVal);
1064
1065	return rc;
1066	}
1067
1068	/**
1069	* Entry point to parse a JSON document.
1070	*
1071	* @returns IPRT status code.
1072	* @param pTokenizer The tokenizer state.
1073	* @param ppJsonVal Where to store the root JSON value on success.
1074	* @param pErrInfo Where to store extended error info. Optional.
1075	*/
1076	static int rtJsonParse(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT *ppJsonVal,
1077	PRTERRINFO pErrInfo)
1078	{
1079	PRTJSONTOKEN pToken = NULL;
1080	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
1081	if (RT_SUCCESS(rc))
1082	rc = rtJsonParseValue(pTokenizer, pToken, ppJsonVal, pErrInfo);
1083
1084	return rc;
1085	}
1086
1087	/**
1088	* Read callback for RTJsonParseFromBuf().
1089	*/
1090	static DECLCALLBACK(int) rtJsonTokenizerParseFromBuf(void *pvUser, size_t offInput,
1091	void *pvBuf, size_t cbBuf,
1092	size_t *pcbRead)
1093	{
1094	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1095	size_t cbLeft = offInput < pArgs->cbData ? pArgs->cbData - offInput : 0;
1096
1097	if (cbLeft)
1098	memcpy(pvBuf, &pArgs->u.pbBuf[offInput], RT_MIN(cbLeft, cbBuf));
1099
1100	*pcbRead = RT_MIN(cbLeft, cbBuf);
1101
1102	return VINF_SUCCESS;
1103	}
1104
1105	/**
1106	* Read callback for RTJsonParseFromString().
1107	*/
1108	static DECLCALLBACK(int) rtJsonTokenizerParseFromString(void *pvUser, size_t offInput,
1109	void *pvBuf, size_t cbBuf,
1110	size_t *pcbRead)
1111	{
1112	const char pszStr = (const char )pvUser;
1113	size_t cchStr = strlen(pszStr) + 1; /* Include zero terminator. */
1114	size_t cbLeft = offInput < cchStr ? cchStr - offInput : 0;
1115
1116	if (cbLeft)
1117	memcpy(pvBuf, &pszStr[offInput], RT_MIN(cbLeft, cbBuf));
1118
1119	*pcbRead = RT_MIN(cbLeft, cbBuf);
1120
1121	return VINF_SUCCESS;
1122	}
1123
1124	/**
1125	* Read callback for RTJsonParseFromFile().
1126	*/
1127	static DECLCALLBACK(int) rtJsonTokenizerParseFromFile(void *pvUser, size_t offInput,
1128	void *pvBuf, size_t cbBuf,
1129	size_t *pcbRead)
1130	{
1131	int rc = VINF_SUCCESS;
1132	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1133	size_t cbRead = 0;
1134
1135	rc = RTStrmReadEx(pArgs->u.hStream, pvBuf, cbBuf, &cbRead);
1136	if (RT_SUCCESS(rc))
1137	*pcbRead = cbRead;
1138
1139	return rc;
1140	}
1141
1142	RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf,
1143	PRTERRINFO pErrInfo)
1144	{
1145	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1146	AssertPtrReturn(pbBuf, VERR_INVALID_POINTER);
1147	AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
1148
1149	int rc = VINF_SUCCESS;
1150	RTJSONREADERARGS Args;
1151	RTJSONTOKENIZER Tokenizer;
1152
1153	Args.cbData = cbBuf;
1154	Args.u.pbBuf = pbBuf;
1155
1156	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromBuf, &Args);
1157	if (RT_SUCCESS(rc))
1158	{
1159	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1160	rtJsonTokenizerDestroy(&Tokenizer);
1161	}
1162
1163	return rc;
1164	}
1165
1166	RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo)
1167	{
1168	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1169	AssertPtrReturn(pszStr, VERR_INVALID_POINTER);
1170
1171	int rc = VINF_SUCCESS;
1172	RTJSONTOKENIZER Tokenizer;
1173
1174	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromString, (void *)pszStr);
1175	if (RT_SUCCESS(rc))
1176	{
1177	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1178	rtJsonTokenizerDestroy(&Tokenizer);
1179	}
1180
1181	return rc;
1182	}
1183
1184	RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo)
1185	{
1186	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1187	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1188
1189	int rc = VINF_SUCCESS;
1190	RTJSONREADERARGS Args;
1191
1192	Args.cbData = 0;
1193	rc = RTStrmOpen(pszFilename, "r", &Args.u.hStream);
1194	if (RT_SUCCESS(rc))
1195	{
1196	RTJSONTOKENIZER Tokenizer;
1197
1198	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromFile, &Args);
1199	if (RT_SUCCESS(rc))
1200	{
1201	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1202	rtJsonTokenizerDestroy(&Tokenizer);
1203	}
1204	RTStrmClose(Args.u.hStream);
1205	}
1206
1207	return rc;
1208	}
1209
1210	RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal)
1211	{
1212	PRTJSONVALINT pThis = hJsonVal;
1213	AssertPtrReturn(pThis, UINT32_MAX);
1214
1215	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1216	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1217	return cRefs;
1218	}
1219
1220	RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal)
1221	{
1222	PRTJSONVALINT pThis = hJsonVal;
1223	if (pThis == NIL_RTJSONVAL)
1224	return 0;
1225	AssertPtrReturn(pThis, UINT32_MAX);
1226
1227	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1228	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1229	if (cRefs == 0)
1230	rtJsonValDestroy(pThis);
1231	return cRefs;
1232	}
1233
1234	RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal)
1235	{
1236	PRTJSONVALINT pThis = hJsonVal;
1237	if (pThis == NIL_RTJSONVAL)
1238	return RTJSONVALTYPE_INVALID;
1239	AssertPtrReturn(pThis, RTJSONVALTYPE_INVALID);
1240
1241	return pThis->enmType;
1242	}
1243
1244	RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal)
1245	{
1246	PRTJSONVALINT pThis = hJsonVal;
1247	AssertReturn(pThis != NIL_RTJSONVAL, NULL);
1248	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, NULL);
1249
1250	return pThis->Type.String.pszStr;
1251	}
1252
1253	RTDECL(int) RTJsonValueGetStringEx(RTJSONVAL hJsonVal, const char **ppszStr)
1254	{
1255	PRTJSONVALINT pThis = hJsonVal;
1256	AssertPtrReturn(ppszStr, VERR_INVALID_POINTER);
1257	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1258	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, VERR_JSON_VALUE_INVALID_TYPE);
1259
1260	*ppszStr = pThis->Type.String.pszStr;
1261	return VINF_SUCCESS;
1262	}
1263
1264	RTDECL(int) RTJsonValueGetNumber(RTJSONVAL hJsonVal, int64_t *pi64Num)
1265	{
1266	PRTJSONVALINT pThis = hJsonVal;
1267	AssertPtrReturn(pi64Num, VERR_INVALID_POINTER);
1268	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1269	AssertReturn(pThis->enmType == RTJSONVALTYPE_NUMBER, VERR_JSON_VALUE_INVALID_TYPE);
1270
1271	*pi64Num = pThis->Type.Number.i64Num;
1272	return VINF_SUCCESS;
1273	}
1274
1275	RTDECL(int) RTJsonValueGetByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal)
1276	{
1277	PRTJSONVALINT pThis = hJsonVal;
1278	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
1279	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1280	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1281	AssertReturn(pThis->enmType == RTJSONVALTYPE_OBJECT, VERR_JSON_VALUE_INVALID_TYPE);
1282
1283	int rc = VERR_NOT_FOUND;
1284	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
1285	{
1286	if (!RTStrCmp(pThis->Type.Object.papszNames[i], pszName))
1287	{
1288	RTJsonValueRetain(pThis->Type.Object.papValues[i]);
1289	*phJsonVal = pThis->Type.Object.papValues[i];
1290	rc = VINF_SUCCESS;
1291	break;
1292	}
1293	}
1294
1295	return rc;
1296	}
1297
1298	RTDECL(uint32_t) RTJsonValueGetArraySize(RTJSONVAL hJsonVal)
1299	{
1300	PRTJSONVALINT pThis = hJsonVal;
1301	AssertReturn(pThis != NIL_RTJSONVAL, 0);
1302	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, 0);
1303
1304	return pThis->Type.Array.cItems;
1305	}
1306
1307	RTDECL(int) RTJsonValueGetArraySizeEx(RTJSONVAL hJsonVal, uint32_t *pcItems)
1308	{
1309	PRTJSONVALINT pThis = hJsonVal;
1310	AssertPtrReturn(pcItems, VERR_INVALID_POINTER);
1311	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1312	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1313
1314	*pcItems = pThis->Type.Array.cItems;
1315	return VINF_SUCCESS;
1316	}
1317
1318	RTDECL(int) RTJsonValueGetByIndex(RTJSONVAL hJsonVal, uint32_t idx, PRTJSONVAL phJsonVal)
1319	{
1320	PRTJSONVALINT pThis = hJsonVal;
1321	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1322	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1323	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1324	AssertReturn(idx < pThis->Type.Array.cItems, VERR_OUT_OF_RANGE);
1325
1326	RTJsonValueRetain(pThis->Type.Array.papItems[idx]);
1327	*phJsonVal = pThis->Type.Array.papItems[idx];
1328	return VINF_SUCCESS;
1329	}
1330
1331	RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt)
1332	{
1333	PRTJSONVALINT pThis = hJsonVal;
1334	AssertPtrReturn(phJsonIt, VERR_INVALID_POINTER);
1335	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1336	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY \|\| pThis->enmType == RTJSONVALTYPE_OBJECT,
1337	VERR_JSON_VALUE_INVALID_TYPE);
1338
1339	PRTJSONITINT pIt = (PRTJSONITINT)RTMemTmpAllocZ(sizeof(RTJSONITINT));
1340	if (RT_UNLIKELY(!pIt))
1341	return VERR_NO_MEMORY;
1342
1343	RTJsonValueRetain(hJsonVal);
1344	pIt->pJsonVal = pThis;
1345	pIt->idxCur = 0;
1346	*phJsonIt = pIt;
1347
1348	return VINF_SUCCESS;
1349	}
1350
1351	RTDECL(int) RTJsonIteratorGetValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName)
1352	{
1353	PRTJSONITINT pIt = hJsonIt;
1354	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1355	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1356
1357	int rc = VINF_SUCCESS;
1358	PRTJSONVALINT pThis = pIt->pJsonVal;
1359	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1360	{
1361	if (pIt->idxCur < pThis->Type.Array.cItems)
1362	{
1363	if (ppszName)
1364	*ppszName = NULL;
1365
1366	RTJsonValueRetain(pThis->Type.Array.papItems[pIt->idxCur]);
1367	*phJsonVal = pThis->Type.Array.papItems[pIt->idxCur];
1368	}
1369	else
1370	rc = VERR_JSON_ITERATOR_END;
1371	}
1372	else
1373	{
1374	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1375
1376	if (pIt->idxCur < pThis->Type.Object.cMembers)
1377	{
1378	if (ppszName)
1379	*ppszName = pThis->Type.Object.papszNames[pIt->idxCur];
1380
1381	RTJsonValueRetain(pThis->Type.Object.papValues[pIt->idxCur]);
1382	*phJsonVal = pThis->Type.Object.papValues[pIt->idxCur];
1383	}
1384	else
1385	rc = VERR_JSON_ITERATOR_END;
1386	}
1387
1388	return rc;
1389	}
1390
1391	RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt)
1392	{
1393	PRTJSONITINT pIt = hJsonIt;
1394	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1395
1396	int rc = VINF_SUCCESS;
1397	PRTJSONVALINT pThis = pIt->pJsonVal;
1398	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1399	{
1400	if (pIt->idxCur < pThis->Type.Array.cItems)
1401	pIt->idxCur++;
1402	else
1403	rc = VERR_JSON_ITERATOR_END;
1404	}
1405	else
1406	{
1407	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1408
1409	if (pIt->idxCur < pThis->Type.Object.cMembers)
1410	pIt->idxCur++;
1411	else
1412	rc = VERR_JSON_ITERATOR_END;
1413	}
1414
1415	return rc;
1416	}
1417
1418	RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt)
1419	{
1420	PRTJSONITINT pThis = hJsonIt;
1421	if (pThis == NIL_RTJSONIT)
1422	return;
1423	AssertPtrReturnVoid(pThis);
1424
1425	RTJsonValueRelease(pThis->pJsonVal);
1426	RTMemTmpFree(pThis);
1427	}
1428

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source: vbox/trunk/src/VBox/Runtime/common/misc/json.cpp@ 61716

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