json.cpp@ 73874

Last change on this file since 73874 was 73874, checked in by vboxsync, 6 years ago
RTJson: Added RTJsonValueTypeName and did some internal macro cleanups in the implementation. bugref:9167
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1	/* $Id: json.cpp 73874 2018-08-24 15:36:01Z vboxsync $ */
2	/** @file
3	* IPRT JSON parser API (JSON).
4	*/
5
6	/*
7	* Copyright (C) 2016-2017 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	/** The tokenizer error state. */
170	int rcTok;
171	} RTJSONTOKENIZER;
172	/** Pointer to a JSON tokenizer. */
173	typedef RTJSONTOKENIZER *PRTJSONTOKENIZER;
174
175	/** Pointer to the internal JSON value instance. */
176	typedef struct RTJSONVALINT *PRTJSONVALINT;
177
178	/**
179	* A JSON value.
180	*/
181	typedef struct RTJSONVALINT
182	{
183	/** Type of the JSON value. */
184	RTJSONVALTYPE enmType;
185	/** Reference count for this JSON value. */
186	volatile uint32_t cRefs;
187	/** Type dependent data. */
188	union
189	{
190	/** String type*/
191	struct
192	{
193	/** Pointer to the string. */
194	char *pszStr;
195	} String;
196	/** Number type. */
197	struct
198	{
199	/** Signed 64-bit integer. */
200	int64_t i64Num;
201	} Number;
202	/** Array type. */
203	struct
204	{
205	/** Number of elements in the array. */
206	unsigned cItems;
207	/** Pointer to the array of items. */
208	PRTJSONVALINT *papItems;
209	} Array;
210	/** Object type. */
211	struct
212	{
213	/** Number of members. */
214	unsigned cMembers;
215	/** Pointer to the array holding the member names. */
216	char **papszNames;
217	/** Pointer to the array holding the values. */
218	PRTJSONVALINT *papValues;
219	} Object;
220	} Type;
221	} RTJSONVALINT;
222
223	/**
224	* A JSON iterator.
225	*/
226	typedef struct RTJSONITINT
227	{
228	/** Referenced JSON value. */
229	PRTJSONVALINT pJsonVal;
230	/** Current index. */
231	unsigned idxCur;
232	} RTJSONITINT;
233	/** Pointer to the internal JSON iterator instance. */
234	typedef RTJSONITINT *PRTJSONITINT;
235
236	/**
237	* Passing arguments for the read callbacks.
238	*/
239	typedef struct RTJSONREADERARGS
240	{
241	/** Buffer/File size */
242	size_t cbData;
243	/** Data specific for one callback. */
244	union
245	{
246	PRTSTREAM hStream;
247	const uint8_t *pbBuf;
248	} u;
249	} RTJSONREADERARGS;
250	/** Pointer to a readers argument. */
251	typedef RTJSONREADERARGS *PRTJSONREADERARGS;
252
253
254	/*********************************************************************************************************************************
255	* Global variables *
256	*********************************************************************************************************************************/
257
258	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
259	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo);
260
261	/**
262	* Fill the input buffer from the input stream.
263	*
264	* @returns IPRT status code.
265	* @param pTokenizer The tokenizer state.
266	*/
267	static int rtJsonTokenizerRead(PRTJSONTOKENIZER pTokenizer)
268	{
269	size_t cbRead = 0;
270	int rc = pTokenizer->pfnRead(pTokenizer->pvUser, pTokenizer->offInput, &pTokenizer->achBuf[0],
271	sizeof(pTokenizer->achBuf), &cbRead);
272	if (RT_SUCCESS(rc))
273	{
274	pTokenizer->cbBuf = cbRead;
275	pTokenizer->offInput += cbRead;
276	pTokenizer->offBuf = 0;
277	/* Validate UTF-8 encoding. */
278	rc = RTStrValidateEncodingEx(&pTokenizer->achBuf[0], cbRead, 0 /* fFlags */);
279	/* If we read less than requested we reached the end and fill the remainder with terminators. */
280	if (cbRead < sizeof(pTokenizer->achBuf))
281	memset(&pTokenizer->achBuf[cbRead], 0, sizeof(pTokenizer->achBuf) - cbRead);
282	}
283
284	return rc;
285	}
286
287	/**
288	* Skips the given amount of characters in the input stream.
289	*
290	* @returns IPRT status code.
291	* @param pTokenizer The tokenizer state.
292	* @param cchSkip The amount of characters to skip.
293	*/
294	static int rtJsonTokenizerSkip(PRTJSONTOKENIZER pTokenizer, size_t cchSkip)
295	{
296	int rc = VINF_SUCCESS;
297
298	/*
299	* In case we reached the end of the stream don't even attempt to read new data.
300	* Safety precaution for possible bugs in the parser causing out of bounds reads
301	*/
302	if (pTokenizer->achBuf[pTokenizer->offBuf] == '\0')
303	return rc;
304
305	while ( cchSkip > 0
306	&& pTokenizer->offBuf < pTokenizer->cbBuf
307	&& RT_SUCCESS(rc))
308	{
309	size_t cchThisSkip = RT_MIN(cchSkip, pTokenizer->cbBuf - pTokenizer->offBuf);
310
311	pTokenizer->offBuf += cchThisSkip;
312	/* Read new data if required and we didn't reach the end yet. */
313	if ( pTokenizer->offBuf == pTokenizer->cbBuf
314	&& pTokenizer->cbBuf == sizeof(pTokenizer->achBuf))
315	rc = rtJsonTokenizerRead(pTokenizer);
316
317	cchSkip -= cchThisSkip;
318	}
319
320	return rc;
321	}
322
323
324	/**
325	* Returns whether the tokenizer reached the end of the stream.
326	*
327	* @returns true if the tokenizer reached the end of stream marker
328	* false otherwise.
329	* @param pTokenizer The tokenizer state.
330	*/
331	DECLINLINE(bool) rtJsonTokenizerIsEos(PRTJSONTOKENIZER pTokenizer)
332	{
333	return pTokenizer->achBuf[pTokenizer->offBuf] == '\0';
334	}
335
336	/**
337	* Skip one character in the input stream.
338	*
339	* @returns nothing.
340	* @param pTokenizer The tokenizer state.
341	*/
342	DECLINLINE(void) rtJsonTokenizerSkipCh(PRTJSONTOKENIZER pTokenizer)
343	{
344	rtJsonTokenizerSkip(pTokenizer, 1);
345	pTokenizer->Pos.iChStart++;
346	pTokenizer->Pos.iChEnd++;
347	}
348
349	/**
350	* Returns the next char in the input buffer without advancing it.
351	*
352	* @returns Next character in the input buffer.
353	* @param pTokenizer The tokenizer state.
354	*/
355	DECLINLINE(char) rtJsonTokenizerPeekCh(PRTJSONTOKENIZER pTokenizer)
356	{
357	return rtJsonTokenizerIsEos(pTokenizer)
358	? '\0'
359	: pTokenizer->achBuf[pTokenizer->offBuf + 1]; /** @todo Read out of bounds */
360	}
361
362	/**
363	* Returns the next character in the input buffer advancing the internal
364	* position.
365	*
366	* @returns Next character in the stream.
367	* @param pTokenizer The tokenizer state.
368	*/
369	DECLINLINE(char) rtJsonTokenizerGetCh(PRTJSONTOKENIZER pTokenizer)
370	{
371	char ch;
372
373	if (rtJsonTokenizerIsEos(pTokenizer))
374	ch = '\0';
375	else
376	ch = pTokenizer->achBuf[pTokenizer->offBuf];
377
378	return ch;
379	}
380
381	/**
382	* Sets a new line for the tokenizer.
383	*
384	* @returns nothing.
385	* @param pTokenizer The tokenizer state.
386	* @param cSkip Amount of characters to skip making up the new line.
387	*/
388	DECLINLINE(void) rtJsonTokenizerNewLine(PRTJSONTOKENIZER pTokenizer, unsigned cSkip)
389	{
390	rtJsonTokenizerSkip(pTokenizer, cSkip);
391	pTokenizer->Pos.iLine++;
392	pTokenizer->Pos.iChStart = 1;
393	pTokenizer->Pos.iChEnd = 1;
394	}
395
396	/**
397	* Checks whether the current position in the input stream is a new line
398	* and skips it.
399	*
400	* @returns Flag whether there was a new line at the current position
401	* in the input buffer.
402	* @param pTokenizer The tokenizer state.
403	*/
404	DECLINLINE(bool) rtJsonTokenizerIsSkipNewLine(PRTJSONTOKENIZER pTokenizer)
405	{
406	bool fNewline = true;
407
408	if ( rtJsonTokenizerGetCh(pTokenizer) == '\r'
409	&& rtJsonTokenizerPeekCh(pTokenizer) == '\n')
410	rtJsonTokenizerNewLine(pTokenizer, 2);
411	else if (rtJsonTokenizerGetCh(pTokenizer) == '\n')
412	rtJsonTokenizerNewLine(pTokenizer, 1);
413	else
414	fNewline = false;
415
416	return fNewline;
417	}
418
419	/**
420	* Skip all whitespace starting from the current input buffer position.
421	* Skips all present comments too.
422	*
423	* @returns nothing.
424	* @param pTokenizer The tokenizer state.
425	*/
426	DECLINLINE(void) rtJsonTokenizerSkipWhitespace(PRTJSONTOKENIZER pTokenizer)
427	{
428	while (!rtJsonTokenizerIsEos(pTokenizer))
429	{
430	while ( rtJsonTokenizerGetCh(pTokenizer) == ' '
431	\|\| rtJsonTokenizerGetCh(pTokenizer) == '\t')
432	rtJsonTokenizerSkipCh(pTokenizer);
433
434	if ( !rtJsonTokenizerIsEos(pTokenizer)
435	&& !rtJsonTokenizerIsSkipNewLine(pTokenizer))
436	break; /* Skipped everything, next is some real content. */
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	size_t cchStrMax = _4K;
535	char pszTmp = (char )RTMemAllocZ(cchStrMax * sizeof(char));
536	if (RT_UNLIKELY(!pszTmp))
537	return VERR_NO_STR_MEMORY;
538
539	RT_BZERO(pszTmp, cchStrMax);
540
541	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\"');
542	rtJsonTokenizerSkipCh(pTokenizer); /* Skip " */
543
544	pToken->enmClass = RTJSONTOKENCLASS_STRING;
545	pToken->Pos = pTokenizer->Pos;
546
547	char ch = rtJsonTokenizerGetCh(pTokenizer);
548	while ( ch != '\"'
549	&& ch != '\0'
550	&& RT_SUCCESS(rc))
551	{
552	if (ch == '\\')
553	{
554	/* Escape sequence, check the next character */
555	rtJsonTokenizerSkipCh(pTokenizer);
556	char chNext = rtJsonTokenizerGetCh(pTokenizer);
557	switch (chNext)
558	{
559	case '\"':
560	pszTmp[cchStr] = '\"';
561	break;
562	case '\\':
563	pszTmp[cchStr] = '\\';
564	break;
565	case '/':
566	pszTmp[cchStr] = '/';
567	break;
568	case '\b':
569	pszTmp[cchStr] = '\b';
570	break;
571	case '\n':
572	pszTmp[cchStr] = '\n';
573	break;
574	case '\f':
575	pszTmp[cchStr] = '\f';
576	break;
577	case '\r':
578	pszTmp[cchStr] = '\r';
579	break;
580	case '\t':
581	pszTmp[cchStr] = '\t';
582	break;
583	case 'u':
584	rc = VERR_NOT_SUPPORTED;
585	break;
586	default:
587	rc = VERR_JSON_MALFORMED;
588	}
589	}
590	else
591	pszTmp[cchStr] = ch;
592
593	if (RT_FAILURE(rc))
594	break;
595
596	cchStr++;
597	rtJsonTokenizerSkipCh(pTokenizer);
598	if (cchStr == cchStrMax - 1)
599	{
600	/* Increase string space. */
601	size_t cchStrMaxNew = cchStrMax + _4K;
602	char pszTmpNew = (char )RTMemRealloc(pszTmp, cchStrMaxNew * sizeof(char));
603	if (RT_UNLIKELY(!pszTmpNew))
604	{
605	rc = VERR_NO_STR_MEMORY;
606	break;
607	}
608
609	RT_BZERO(&pszTmpNew[cchStr], _4K);
610	pszTmp = pszTmpNew;
611	cchStrMax = cchStrMaxNew;
612	}
613	ch = rtJsonTokenizerGetCh(pTokenizer);
614	}
615
616	if (RT_SUCCESS(rc))
617	{
618	if (rtJsonTokenizerGetCh(pTokenizer) == '\"')
619	rtJsonTokenizerSkipCh(pTokenizer); /* Skip closing " */
620
621	pToken->Class.String.pszStr = RTStrDupN(pszTmp, cchStr);
622	if (pToken->Class.String.pszStr)
623	pToken->Pos.iChEnd += cchStr;
624	else
625	rc = VERR_NO_STR_MEMORY;
626	}
627
628	if (pszTmp)
629	RTMemFree(pszTmp);
630
631	return rc;
632	}
633
634	/**
635	* Get the end of stream token.
636	*
637	* @returns IPRT status code.
638	* @param pTokenizer The tokenizer state.
639	* @param pToken The uninitialized token.
640	*/
641	static int rtJsonTokenizerGetEos(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
642	{
643	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\0');
644
645	pToken->enmClass = RTJSONTOKENCLASS_EOS;
646	pToken->Pos = pTokenizer->Pos;
647	return VINF_SUCCESS;
648	}
649
650	/**
651	* Read the next token from the tokenizer stream.
652	*
653	* @returns IPRT status code.
654	* @param pTokenizer The tokenizer to read from.
655	* @param pToken Uninitialized token to fill the token data into.
656	*/
657	static int rtJsonTokenizerReadNextToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
658	{
659	int rc = VINF_SUCCESS;
660
661	/* Skip all eventually existing whitespace and newlines first. */
662	rtJsonTokenizerSkipWhitespace(pTokenizer);
663
664	char ch = rtJsonTokenizerGetCh(pTokenizer);
665	if (RT_C_IS_ALPHA(ch))
666	rc = rtJsonTokenizerGetLiteral(pTokenizer, pToken);
667	else if (RT_C_IS_DIGIT(ch))
668	rc = rtJsonTokenizerGetNumber(pTokenizer, pToken);
669	else if (ch == '\"')
670	rc = rtJsonTokenizerGetString(pTokenizer, pToken);
671	else if (ch == '\0')
672	rc = rtJsonTokenizerGetEos(pTokenizer, pToken);
673	else if (ch == '{')
674	{
675	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_OBJECT;
676	rtJsonTokenizerSkipCh(pTokenizer);
677	}
678	else if (ch == '}')
679	{
680	pToken->enmClass = RTJSONTOKENCLASS_END_OBJECT;
681	rtJsonTokenizerSkipCh(pTokenizer);
682	}
683	else if (ch == '[')
684	{
685	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_ARRAY;
686	rtJsonTokenizerSkipCh(pTokenizer);
687	}
688	else if (ch == ']')
689	{
690	pToken->enmClass = RTJSONTOKENCLASS_END_ARRAY;
691	rtJsonTokenizerSkipCh(pTokenizer);
692	}
693	else if (ch == ':')
694	{
695	pToken->enmClass = RTJSONTOKENCLASS_NAME_SEPARATOR;
696	rtJsonTokenizerSkipCh(pTokenizer);
697	}
698	else if (ch == ',')
699	{
700	pToken->enmClass = RTJSONTOKENCLASS_VALUE_SEPARATOR;
701	rtJsonTokenizerSkipCh(pTokenizer);
702	}
703	else
704	{
705	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
706	rc = VERR_JSON_MALFORMED;
707	}
708
709	if (RT_FAILURE(rc))
710	pTokenizer->rcTok = rc;
711
712	return rc;
713	}
714
715	/**
716	* Create a new tokenizer.
717	*
718	* @returns IPRT status code.
719	* @param pTokenizer The tokenizer state to initialize.
720	* @param pfnRead Read callback for the input stream.
721	* @param pvUser Opaque user data to pass to the callback.
722	*/
723	static int rtJsonTokenizerInit(PRTJSONTOKENIZER pTokenizer, PFNRTJSONTOKENIZERREAD pfnRead, void *pvUser)
724	{
725	pTokenizer->pfnRead = pfnRead;
726	pTokenizer->pvUser = pvUser;
727	pTokenizer->offInput = 0;
728	pTokenizer->cbBuf = 0;
729	pTokenizer->offBuf = 0;
730	pTokenizer->Pos.iLine = 1;
731	pTokenizer->Pos.iChStart = 1;
732	pTokenizer->Pos.iChEnd = 1;
733	pTokenizer->pTokenCurr = &pTokenizer->Token1;
734	pTokenizer->pTokenNext = &pTokenizer->Token2;
735	pTokenizer->rcTok = VINF_SUCCESS;
736
737	RT_ZERO(pTokenizer->achBuf);
738
739	/* Fill the input buffer. */
740	int rc = rtJsonTokenizerRead(pTokenizer);
741
742	/* Fill the tokenizer with two first tokens. */
743	if (RT_SUCCESS(rc))
744	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
745	if (RT_SUCCESS(rc))
746	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
747
748	return rc;
749	}
750
751	/**
752	* Destroys a given tokenizer state.
753	*
754	* @returns nothing.
755	* @param pTokenizer The tokenizer to destroy.
756	*/
757	static void rtJsonTokenizerDestroy(PRTJSONTOKENIZER pTokenizer)
758	{
759	RT_NOREF_PV(pTokenizer);
760	}
761
762	/**
763	* Get the current token in the input stream.
764	*
765	* @returns Pointer to the next token in the stream.
766	* @param pTokenizer The tokenizer state.
767	* @param ppToken Where to store the pointer to the current token on success.
768	*/
769	DECLINLINE(int) rtJsonTokenizerGetToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN *ppToken)
770	{
771	if (RT_SUCCESS(pTokenizer->rcTok))
772	{
773	*ppToken = pTokenizer->pTokenCurr;
774	return VINF_SUCCESS;
775	}
776
777	return pTokenizer->rcTok;
778	}
779
780	/**
781	* Consume the current token advancing to the next in the stream.
782	*
783	* @returns nothing.
784	* @param pTokenizer The tokenizer state.
785	*/
786	static void rtJsonTokenizerConsume(PRTJSONTOKENIZER pTokenizer)
787	{
788	PRTJSONTOKEN pTokenTmp = pTokenizer->pTokenCurr;
789
790	/* Switch next token to current token and read in the next token. */
791	pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
792	pTokenizer->pTokenNext = pTokenTmp;
793	rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
794	}
795
796	/**
797	* Consumes the current token if it matches the given class returning an indicator.
798	*
799	* @returns true if the class matched and the token was consumed.
800	* @retval false otherwise.
801	* @param pTokenizer The tokenizer state.
802	* @param enmClass The token class to match against.
803	*/
804	static bool rtJsonTokenizerConsumeIfMatched(PRTJSONTOKENIZER pTokenizer, RTJSONTOKENCLASS enmClass)
805	{
806	PRTJSONTOKEN pToken = NULL;
807	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
808	if (RT_SUCCESS(rc))
809	{
810	if (pToken->enmClass == enmClass)
811	{
812	rtJsonTokenizerConsume(pTokenizer);
813	return true;
814	}
815	}
816
817	return false;
818	}
819
820	/**
821	* Destroys a given JSON value releasing the reference to all child values.
822	*
823	* @returns nothing.
824	* @param pThis The JSON value to destroy.
825	*/
826	static void rtJsonValDestroy(PRTJSONVALINT pThis)
827	{
828	switch (pThis->enmType)
829	{
830	case RTJSONVALTYPE_OBJECT:
831	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
832	{
833	RTStrFree(pThis->Type.Object.papszNames[i]);
834	RTJsonValueRelease(pThis->Type.Object.papValues[i]);
835	}
836	RTMemFree(pThis->Type.Object.papszNames);
837	RTMemFree(pThis->Type.Object.papValues);
838	break;
839	case RTJSONVALTYPE_ARRAY:
840	for (unsigned i = 0; i < pThis->Type.Array.cItems; i++)
841	RTJsonValueRelease(pThis->Type.Array.papItems[i]);
842	RTMemFree(pThis->Type.Array.papItems);
843	break;
844	case RTJSONVALTYPE_STRING:
845	RTStrFree(pThis->Type.String.pszStr);
846	break;
847	case RTJSONVALTYPE_NUMBER:
848	case RTJSONVALTYPE_NULL:
849	case RTJSONVALTYPE_TRUE:
850	case RTJSONVALTYPE_FALSE:
851	/* nothing to do. */
852	break;
853	default:
854	AssertMsgFailed(("Invalid JSON value type: %u\n", pThis->enmType));
855	}
856	RTMemFree(pThis);
857	}
858
859	/**
860	* Creates a new JSON value with the given type.
861	*
862	* @returns Pointer to JSON value on success, NULL if out of memory.
863	* @param enmType The JSON value type.
864	*/
865	static PRTJSONVALINT rtJsonValueCreate(RTJSONVALTYPE enmType)
866	{
867	PRTJSONVALINT pThis = (PRTJSONVALINT)RTMemAllocZ(sizeof(RTJSONVALINT));
868	if (RT_LIKELY(pThis))
869	{
870	pThis->enmType = enmType;
871	pThis->cRefs = 1;
872	}
873
874	return pThis;
875	}
876
877	/**
878	* Parses an JSON array.
879	*
880	* @returns IPRT status code.
881	* @param pTokenizer The tokenizer to use.
882	* @param pJsonVal The JSON array value to fill in.
883	* @param pErrInfo Where to store extended error info. Optional.
884	*/
885	static int rtJsonParseArray(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
886	{
887	int rc = VINF_SUCCESS;
888	PRTJSONTOKEN pToken = NULL;
889	uint32_t cItems = 0;
890	uint32_t cItemsMax = 0;
891	PRTJSONVALINT *papItems = NULL;
892
893	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
894	while ( RT_SUCCESS(rc)
895	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY
896	&& pToken->enmClass != RTJSONTOKENCLASS_EOS)
897	{
898	PRTJSONVALINT pVal = NULL;
899	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
900	if (RT_SUCCESS(rc))
901	{
902	if (cItems == cItemsMax)
903	{
904	cItemsMax += 10;
905	PRTJSONVALINT papItemsNew = (PRTJSONVALINT )RTMemRealloc(papItems, cItemsMax * sizeof(PRTJSONVALINT));
906	if (RT_UNLIKELY(!papItemsNew))
907	{
908	rc = VERR_NO_MEMORY;
909	break;
910	}
911	papItems = papItemsNew;
912	}
913
914	Assert(cItems < cItemsMax);
915	papItems[cItems] = pVal;
916	cItems++;
917	}
918
919	/* Skip value separator and continue with next token. */
920	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
921	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
922
923	if ( RT_SUCCESS(rc)
924	&& !fSkippedSep
925	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY)
926	rc = VERR_JSON_MALFORMED;
927	}
928
929	if (RT_SUCCESS(rc))
930	{
931	if (pToken->enmClass == RTJSONTOKENCLASS_END_ARRAY)
932	{
933	rtJsonTokenizerConsume(pTokenizer);
934	pJsonVal->Type.Array.cItems = cItems;
935	pJsonVal->Type.Array.papItems = papItems;
936	}
937	else
938	rc = VERR_JSON_MALFORMED;
939	}
940
941	if (RT_FAILURE(rc))
942	{
943	for (uint32_t i = 0; i < cItems; i++)
944	RTJsonValueRelease(papItems[i]);
945	RTMemFree(papItems);
946	}
947
948	return rc;
949	}
950
951	/**
952	* Parses an JSON object.
953	*
954	* @returns IPRT status code.
955	* @param pTokenizer The tokenizer to use.
956	* @param pJsonVal The JSON object value to fill in.
957	* @param pErrInfo Where to store extended error info. Optional.
958	*/
959	static int rtJsonParseObject(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
960	{
961	int rc = VINF_SUCCESS;
962	PRTJSONTOKEN pToken = NULL;
963	uint32_t cMembers = 0;
964	uint32_t cMembersMax = 0;
965	PRTJSONVALINT *papValues = NULL;
966	char **papszNames = NULL;
967
968	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
969	while ( RT_SUCCESS(rc)
970	&& pToken->enmClass == RTJSONTOKENCLASS_STRING)
971	{
972	char pszName = pToken->Class.String.pszStr; / We can consume this string as it was allocated. */
973
974	rtJsonTokenizerConsume(pTokenizer);
975	if (rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_NAME_SEPARATOR))
976	{
977	PRTJSONVALINT pVal = NULL;
978	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
979	if (RT_SUCCESS(rc))
980	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
981	if (RT_SUCCESS(rc))
982	{
983	if (cMembers == cMembersMax)
984	{
985	cMembersMax += 10;
986	PRTJSONVALINT papValuesNew = (PRTJSONVALINT )RTMemRealloc(papValues, cMembersMax * sizeof(PRTJSONVALINT));
987	char papszNamesNew = (char )RTMemRealloc(papszNames, cMembersMax * sizeof(char *));
988	if (RT_UNLIKELY(!papValuesNew \|\| !papszNamesNew))
989	{
990	if (papValuesNew)
991	RTMemFree(papValuesNew);
992	if (papszNamesNew)
993	RTMemFree(papszNamesNew);
994	rc = VERR_NO_MEMORY;
995	break;
996	}
997
998	papValues = papValuesNew;
999	papszNames = papszNamesNew;
1000	}
1001
1002	Assert(cMembers < cMembersMax);
1003	papszNames[cMembers] = pszName;
1004	papValues[cMembers] = pVal;
1005	cMembers++;
1006
1007	/* Skip value separator and continue with next token. */
1008	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
1009	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
1010
1011	if ( RT_SUCCESS(rc)
1012	&& !fSkippedSep
1013	&& pToken->enmClass != RTJSONTOKENCLASS_END_OBJECT)
1014	rc = VERR_JSON_MALFORMED;
1015	}
1016	}
1017	else
1018	rc = VERR_JSON_MALFORMED;
1019	}
1020
1021	if (RT_SUCCESS(rc))
1022	{
1023	if (pToken->enmClass == RTJSONTOKENCLASS_END_OBJECT)
1024	{
1025	rtJsonTokenizerConsume(pTokenizer);
1026	pJsonVal->Type.Object.cMembers = cMembers;
1027	pJsonVal->Type.Object.papValues = papValues;
1028	pJsonVal->Type.Object.papszNames = papszNames;
1029	}
1030	else
1031	rc = VERR_JSON_MALFORMED;
1032	}
1033
1034	if (RT_FAILURE(rc))
1035	{
1036	for (uint32_t i = 0; i < cMembers; i++)
1037	{
1038	RTJsonValueRelease(papValues[i]);
1039	RTStrFree(papszNames[i]);
1040	}
1041	RTMemFree(papValues);
1042	RTMemFree(papszNames);
1043	}
1044
1045	return rc;
1046	}
1047
1048	/**
1049	* Parses a single JSON value and returns it on success.
1050	*
1051	* @returns IPRT status code.
1052	* @param pTokenizer The tokenizer to use.
1053	* @param pToken The token to parse.
1054	* @param ppJsonVal Where to store the pointer to the JSON value on success.
1055	* @param pErrInfo Where to store extended error info. Optional.
1056	*/
1057	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
1058	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo)
1059	{
1060	int rc = VINF_SUCCESS;
1061	PRTJSONVALINT pVal = NULL;
1062
1063	switch (pToken->enmClass)
1064	{
1065	case RTJSONTOKENCLASS_BEGIN_ARRAY:
1066	rtJsonTokenizerConsume(pTokenizer);
1067	pVal = rtJsonValueCreate(RTJSONVALTYPE_ARRAY);
1068	if (RT_LIKELY(pVal))
1069	rc = rtJsonParseArray(pTokenizer, pVal, pErrInfo);
1070	break;
1071	case RTJSONTOKENCLASS_BEGIN_OBJECT:
1072	rtJsonTokenizerConsume(pTokenizer);
1073	pVal = rtJsonValueCreate(RTJSONVALTYPE_OBJECT);
1074	if (RT_LIKELY(pVal))
1075	rc = rtJsonParseObject(pTokenizer, pVal, pErrInfo);
1076	break;
1077	case RTJSONTOKENCLASS_STRING:
1078	pVal = rtJsonValueCreate(RTJSONVALTYPE_STRING);
1079	if (RT_LIKELY(pVal))
1080	pVal->Type.String.pszStr = pToken->Class.String.pszStr;
1081	rtJsonTokenizerConsume(pTokenizer);
1082	break;
1083	case RTJSONTOKENCLASS_NUMBER:
1084	pVal = rtJsonValueCreate(RTJSONVALTYPE_NUMBER);
1085	if (RT_LIKELY(pVal))
1086	pVal->Type.Number.i64Num = pToken->Class.Number.i64Num;
1087	rtJsonTokenizerConsume(pTokenizer);
1088	break;
1089	case RTJSONTOKENCLASS_NULL:
1090	rtJsonTokenizerConsume(pTokenizer);
1091	pVal = rtJsonValueCreate(RTJSONVALTYPE_NULL);
1092	break;
1093	case RTJSONTOKENCLASS_FALSE:
1094	rtJsonTokenizerConsume(pTokenizer);
1095	pVal = rtJsonValueCreate(RTJSONVALTYPE_FALSE);
1096	break;
1097	case RTJSONTOKENCLASS_TRUE:
1098	rtJsonTokenizerConsume(pTokenizer);
1099	pVal = rtJsonValueCreate(RTJSONVALTYPE_TRUE);
1100	break;
1101	case RTJSONTOKENCLASS_END_ARRAY:
1102	case RTJSONTOKENCLASS_END_OBJECT:
1103	case RTJSONTOKENCLASS_NAME_SEPARATOR:
1104	case RTJSONTOKENCLASS_VALUE_SEPARATOR:
1105	case RTJSONTOKENCLASS_EOS:
1106	default:
1107	/** @todo Error info */
1108	rc = VERR_JSON_MALFORMED;
1109	break;
1110	}
1111
1112	if (RT_SUCCESS(rc))
1113	{
1114	if (pVal)
1115	*ppJsonVal = pVal;
1116	else
1117	rc = VERR_NO_MEMORY;
1118	}
1119	else if (pVal)
1120	rtJsonValDestroy(pVal);
1121
1122	return rc;
1123	}
1124
1125	/**
1126	* Entry point to parse a JSON document.
1127	*
1128	* @returns IPRT status code.
1129	* @param pTokenizer The tokenizer state.
1130	* @param ppJsonVal Where to store the root JSON value on success.
1131	* @param pErrInfo Where to store extended error info. Optional.
1132	*/
1133	static int rtJsonParse(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT *ppJsonVal,
1134	PRTERRINFO pErrInfo)
1135	{
1136	PRTJSONTOKEN pToken = NULL;
1137	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
1138	if (RT_SUCCESS(rc))
1139	rc = rtJsonParseValue(pTokenizer, pToken, ppJsonVal, pErrInfo);
1140
1141	return rc;
1142	}
1143
1144	/**
1145	* Read callback for RTJsonParseFromBuf().
1146	*/
1147	static DECLCALLBACK(int) rtJsonTokenizerParseFromBuf(void *pvUser, size_t offInput,
1148	void *pvBuf, size_t cbBuf,
1149	size_t *pcbRead)
1150	{
1151	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1152	size_t cbLeft = offInput < pArgs->cbData ? pArgs->cbData - offInput : 0;
1153
1154	if (cbLeft)
1155	memcpy(pvBuf, &pArgs->u.pbBuf[offInput], RT_MIN(cbLeft, cbBuf));
1156
1157	*pcbRead = RT_MIN(cbLeft, cbBuf);
1158
1159	return VINF_SUCCESS;
1160	}
1161
1162	/**
1163	* Read callback for RTJsonParseFromString().
1164	*/
1165	static DECLCALLBACK(int) rtJsonTokenizerParseFromString(void *pvUser, size_t offInput,
1166	void *pvBuf, size_t cbBuf,
1167	size_t *pcbRead)
1168	{
1169	const char pszStr = (const char )pvUser;
1170	size_t cchStr = strlen(pszStr) + 1; /* Include zero terminator. */
1171	size_t cbLeft = offInput < cchStr ? cchStr - offInput : 0;
1172
1173	if (cbLeft)
1174	memcpy(pvBuf, &pszStr[offInput], RT_MIN(cbLeft, cbBuf));
1175
1176	*pcbRead = RT_MIN(cbLeft, cbBuf);
1177
1178	return VINF_SUCCESS;
1179	}
1180
1181	/**
1182	* Read callback for RTJsonParseFromFile().
1183	*/
1184	static DECLCALLBACK(int) rtJsonTokenizerParseFromFile(void *pvUser, size_t offInput,
1185	void *pvBuf, size_t cbBuf,
1186	size_t *pcbRead)
1187	{
1188	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1189
1190	RT_NOREF_PV(offInput);
1191
1192	size_t cbRead = 0;
1193	int rc = RTStrmReadEx(pArgs->u.hStream, pvBuf, cbBuf, &cbRead);
1194	if (RT_SUCCESS(rc))
1195	*pcbRead = cbRead;
1196
1197	return rc;
1198	}
1199
1200	RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf,
1201	PRTERRINFO pErrInfo)
1202	{
1203	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1204	AssertPtrReturn(pbBuf, VERR_INVALID_POINTER);
1205	AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
1206
1207	RTJSONTOKENIZER Tokenizer;
1208	RTJSONREADERARGS Args;
1209	Args.cbData = cbBuf;
1210	Args.u.pbBuf = pbBuf;
1211
1212	int rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromBuf, &Args);
1213	if (RT_SUCCESS(rc))
1214	{
1215	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1216	rtJsonTokenizerDestroy(&Tokenizer);
1217	}
1218
1219	return rc;
1220	}
1221
1222	RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo)
1223	{
1224	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1225	AssertPtrReturn(pszStr, VERR_INVALID_POINTER);
1226
1227	RTJSONTOKENIZER Tokenizer;
1228	int rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromString, (void *)pszStr);
1229	if (RT_SUCCESS(rc))
1230	{
1231	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1232	rtJsonTokenizerDestroy(&Tokenizer);
1233	}
1234
1235	return rc;
1236	}
1237
1238	RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo)
1239	{
1240	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1241	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1242
1243	int rc = VINF_SUCCESS;
1244	RTJSONREADERARGS Args;
1245
1246	Args.cbData = 0;
1247	rc = RTStrmOpen(pszFilename, "r", &Args.u.hStream);
1248	if (RT_SUCCESS(rc))
1249	{
1250	RTJSONTOKENIZER Tokenizer;
1251
1252	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromFile, &Args);
1253	if (RT_SUCCESS(rc))
1254	{
1255	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1256	rtJsonTokenizerDestroy(&Tokenizer);
1257	}
1258	RTStrmClose(Args.u.hStream);
1259	}
1260
1261	return rc;
1262	}
1263
1264	RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal)
1265	{
1266	PRTJSONVALINT pThis = hJsonVal;
1267	AssertPtrReturn(pThis, UINT32_MAX);
1268
1269	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1270	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1271	return cRefs;
1272	}
1273
1274	RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal)
1275	{
1276	PRTJSONVALINT pThis = hJsonVal;
1277	if (pThis == NIL_RTJSONVAL)
1278	return 0;
1279	AssertPtrReturn(pThis, UINT32_MAX);
1280
1281	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1282	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1283	if (cRefs == 0)
1284	rtJsonValDestroy(pThis);
1285	return cRefs;
1286	}
1287
1288	RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal)
1289	{
1290	PRTJSONVALINT pThis = hJsonVal;
1291	AssertPtrReturn(pThis, RTJSONVALTYPE_INVALID);
1292
1293	if (pThis == NIL_RTJSONVAL)
1294	return RTJSONVALTYPE_INVALID;
1295
1296	return pThis->enmType;
1297	}
1298
1299
1300	RTDECL(const char *) RTJsonValueTypeName(RTJSONVALTYPE enmType)
1301	{
1302	switch (enmType)
1303	{
1304	case RTJSONVALTYPE_INVALID: return "invalid";
1305	case RTJSONVALTYPE_OBJECT: return "object";
1306	case RTJSONVALTYPE_ARRAY: return "array";
1307	case RTJSONVALTYPE_STRING: return "string";
1308	case RTJSONVALTYPE_NUMBER: return "number";
1309	case RTJSONVALTYPE_NULL: return "null";
1310	case RTJSONVALTYPE_TRUE: return "true";
1311	case RTJSONVALTYPE_FALSE: return "false";
1312	default: return "???";
1313	}
1314	}
1315
1316
1317	#define RTJSON_ASSERT_TYPE_RETURN(pJson, enmExpectedType, ret) do { \
1318	AssertPtrReturn((pJson), (ret)); \
1319	AssertReturn((pJson) != NIL_RTJSONVAL, (ret)); \
1320	AssertReturn((pJson)->enmType == (enmExpectedType), (ret)); \
1321	} while (0)
1322
1323	#define RTJSON_TYPECHECK_RETURN(pJson, enmExpectedType) do {\
1324	if (RT_LIKELY((pJson) != NIL_RTJSONVAL)) { /likely/ } \
1325	else return VERR_INVALID_HANDLE; \
1326	if ((pJson)->enmType == (enmExpectedType)) { /likely/ } \
1327	else return VERR_JSON_VALUE_INVALID_TYPE; \
1328	} while (0)
1329
1330
1331	#define RTJSON_TYPECHECK_CONTAINER_RETURN(pJson) do { \
1332	if (RT_LIKELY((pJson) != NIL_RTJSONVAL)) { /* likely */ } \
1333	else return VERR_INVALID_HANDLE; \
1334	if ( (pJson)->enmType == RTJSONVALTYPE_ARRAY \
1335	\|\| (pJson)->enmType == RTJSONVALTYPE_OBJECT) \
1336	{ /* likely */ } \
1337	else return VERR_JSON_VALUE_INVALID_TYPE; \
1338	} while (0)
1339
1340
1341	RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal)
1342	{
1343	PRTJSONVALINT pThis = hJsonVal;
1344	RTJSON_ASSERT_TYPE_RETURN(pThis, RTJSONVALTYPE_STRING, NULL);
1345
1346	return pThis->Type.String.pszStr;
1347	}
1348
1349
1350	RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr)
1351	{
1352	PRTJSONVALINT pThis = hJsonVal;
1353	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1354	AssertPtrReturn(ppszStr, VERR_INVALID_POINTER);
1355
1356	RTJSON_TYPECHECK_RETURN(pThis, RTJSONVALTYPE_STRING);
1357	*ppszStr = pThis->Type.String.pszStr;
1358	return VINF_SUCCESS;
1359	}
1360
1361	RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num)
1362	{
1363	PRTJSONVALINT pThis = hJsonVal;
1364	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1365	AssertPtrReturn(pi64Num, VERR_INVALID_POINTER);
1366
1367	RTJSON_TYPECHECK_RETURN(pThis, RTJSONVALTYPE_NUMBER);
1368	*pi64Num = pThis->Type.Number.i64Num;
1369	return VINF_SUCCESS;
1370	}
1371
1372	RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal)
1373	{
1374	PRTJSONVALINT pThis = hJsonVal;
1375	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1376	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
1377	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1378
1379	RTJSON_TYPECHECK_RETURN(pThis, RTJSONVALTYPE_OBJECT);
1380
1381	int rc = VERR_NOT_FOUND;
1382	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
1383	{
1384	if (!RTStrCmp(pThis->Type.Object.papszNames[i], pszName))
1385	{
1386	RTJsonValueRetain(pThis->Type.Object.papValues[i]);
1387	*phJsonVal = pThis->Type.Object.papValues[i];
1388	rc = VINF_SUCCESS;
1389	break;
1390	}
1391	}
1392
1393	return rc;
1394	}
1395
1396	RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char pszName, int64_t pi64Num)
1397	{
1398	RTJSONVAL hJsonValNum = NIL_RTJSONVAL;
1399	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValNum);
1400	if (RT_SUCCESS(rc))
1401	{
1402	rc = RTJsonValueQueryInteger(hJsonValNum, pi64Num);
1403	RTJsonValueRelease(hJsonValNum);
1404	}
1405
1406	return rc;
1407	}
1408
1409	RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char pszName, char *ppszStr)
1410	{
1411	RTJSONVAL hJsonValStr = NIL_RTJSONVAL;
1412	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValStr);
1413	if (RT_SUCCESS(rc))
1414	{
1415	const char *pszStr = NULL;
1416	rc = RTJsonValueQueryString(hJsonValStr, &pszStr);
1417	if (RT_SUCCESS(rc))
1418	{
1419	*ppszStr = RTStrDup(pszStr);
1420	if (!*ppszStr)
1421	rc = VERR_NO_STR_MEMORY;
1422	}
1423	RTJsonValueRelease(hJsonValStr);
1424	}
1425
1426	return rc;
1427	}
1428
1429	RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char pszName, bool pfBoolean)
1430	{
1431	AssertPtrReturn(pfBoolean, VERR_INVALID_POINTER);
1432
1433	RTJSONVAL hJsonValBool = NIL_RTJSONVAL;
1434	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValBool);
1435	if (RT_SUCCESS(rc))
1436	{
1437	RTJSONVALTYPE enmType = RTJsonValueGetType(hJsonValBool);
1438	if (enmType == RTJSONVALTYPE_TRUE)
1439	*pfBoolean = true;
1440	else if (enmType == RTJSONVALTYPE_FALSE)
1441	*pfBoolean = false;
1442	else
1443	rc = VERR_JSON_VALUE_INVALID_TYPE;
1444	RTJsonValueRelease(hJsonValBool);
1445	}
1446
1447	return rc;
1448	}
1449
1450	RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal)
1451	{
1452	PRTJSONVALINT pThis = hJsonVal;
1453	RTJSON_ASSERT_TYPE_RETURN(pThis, RTJSONVALTYPE_ARRAY, 0);
1454
1455	return pThis->Type.Array.cItems;
1456	}
1457
1458	RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems)
1459	{
1460	PRTJSONVALINT pThis = hJsonVal;
1461	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1462	AssertPtrReturn(pcItems, VERR_INVALID_POINTER);
1463
1464	RTJSON_TYPECHECK_RETURN(pThis, RTJSONVALTYPE_ARRAY);
1465	*pcItems = pThis->Type.Array.cItems;
1466	return VINF_SUCCESS;
1467	}
1468
1469	RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal)
1470	{
1471	PRTJSONVALINT pThis = hJsonVal;
1472	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1473	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1474
1475	RTJSON_TYPECHECK_RETURN(pThis, RTJSONVALTYPE_ARRAY);
1476	if (RT_UNLIKELY(idx >= pThis->Type.Array.cItems))
1477	return VERR_OUT_OF_RANGE;
1478
1479	RTJsonValueRetain(pThis->Type.Array.papItems[idx]);
1480	*phJsonVal = pThis->Type.Array.papItems[idx];
1481	return VINF_SUCCESS;
1482	}
1483
1484	RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt)
1485	{
1486	PRTJSONVALINT pThis = hJsonVal;
1487	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1488	AssertPtrReturn(phJsonIt, VERR_INVALID_POINTER);
1489
1490	RTJSON_TYPECHECK_CONTAINER_RETURN(pThis);
1491
1492	PRTJSONITINT pIt = (PRTJSONITINT)RTMemTmpAllocZ(sizeof(RTJSONITINT));
1493	if (RT_UNLIKELY(!pIt))
1494	return VERR_NO_MEMORY;
1495
1496	RTJsonValueRetain(hJsonVal);
1497	pIt->pJsonVal = pThis;
1498	pIt->idxCur = 0;
1499	*phJsonIt = pIt;
1500
1501	return VINF_SUCCESS;
1502	}
1503
1504	RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName)
1505	{
1506	PRTJSONITINT pIt = hJsonIt;
1507	AssertPtrReturn(pIt, VERR_INVALID_HANDLE);
1508	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1509	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1510
1511	int rc = VINF_SUCCESS;
1512	PRTJSONVALINT pThis = pIt->pJsonVal;
1513	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1514	{
1515	if (pIt->idxCur < pThis->Type.Array.cItems)
1516	{
1517	if (ppszName)
1518	*ppszName = NULL;
1519
1520	RTJsonValueRetain(pThis->Type.Array.papItems[pIt->idxCur]);
1521	*phJsonVal = pThis->Type.Array.papItems[pIt->idxCur];
1522	}
1523	else
1524	rc = VERR_JSON_ITERATOR_END;
1525	}
1526	else
1527	{
1528	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1529
1530	if (pIt->idxCur < pThis->Type.Object.cMembers)
1531	{
1532	if (ppszName)
1533	*ppszName = pThis->Type.Object.papszNames[pIt->idxCur];
1534
1535	RTJsonValueRetain(pThis->Type.Object.papValues[pIt->idxCur]);
1536	*phJsonVal = pThis->Type.Object.papValues[pIt->idxCur];
1537	}
1538	else
1539	rc = VERR_JSON_ITERATOR_END;
1540	}
1541
1542	return rc;
1543	}
1544
1545	RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt)
1546	{
1547	PRTJSONITINT pIt = hJsonIt;
1548	AssertPtrReturn(pIt, VERR_INVALID_HANDLE);
1549	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1550
1551	int rc = VINF_SUCCESS;
1552	PRTJSONVALINT pThis = pIt->pJsonVal;
1553	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1554	{
1555	if (pIt->idxCur < pThis->Type.Array.cItems)
1556	pIt->idxCur++;
1557
1558	if (pIt->idxCur == pThis->Type.Object.cMembers)
1559	rc = VERR_JSON_ITERATOR_END;
1560	}
1561	else
1562	{
1563	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1564
1565	if (pIt->idxCur < pThis->Type.Object.cMembers)
1566	pIt->idxCur++;
1567
1568	if (pIt->idxCur == pThis->Type.Object.cMembers)
1569	rc = VERR_JSON_ITERATOR_END;
1570	}
1571
1572	return rc;
1573	}
1574
1575	RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt)
1576	{
1577	PRTJSONITINT pThis = hJsonIt;
1578	AssertPtrReturnVoid(pThis);
1579
1580	if (pThis == NIL_RTJSONIT)
1581	return;
1582
1583	RTJsonValueRelease(pThis->pJsonVal);
1584	RTMemTmpFree(pThis);
1585	}

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source: vbox/trunk/src/VBox/Runtime/common/misc/json.cpp@ 73874

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