json.cpp@ 69222

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1	/* $Id: json.cpp 69111 2017-10-17 14:26:02Z 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	} 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	break; /* Skipped everything, next is some real content. */
435	}
436	}
437
438	/**
439	* Get an literal token from the tokenizer.
440	*
441	* @returns IPRT status code.
442	* @param pTokenizer The tokenizer state.
443	* @param pToken The uninitialized token.
444	*/
445	static int rtJsonTokenizerGetLiteral(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
446	{
447	int rc = VINF_SUCCESS;
448	char ch = rtJsonTokenizerGetCh(pTokenizer);
449	size_t cchLiteral = 0;
450	char szLiteral[6]; /* false + 0 terminator as the lingest possible literal. */
451	RT_ZERO(szLiteral);
452
453	pToken->Pos = pTokenizer->Pos;
454
455	Assert(RT_C_IS_ALPHA(ch));
456
457	while ( RT_C_IS_ALPHA(ch)
458	&& cchLiteral < RT_ELEMENTS(szLiteral) - 1)
459	{
460	szLiteral[cchLiteral] = ch;
461	cchLiteral++;
462	rtJsonTokenizerSkipCh(pTokenizer);
463	ch = rtJsonTokenizerGetCh(pTokenizer);
464	}
465
466	if (!RTStrNCmp(&szLiteral[0], "false", RT_ELEMENTS(szLiteral)))
467	pToken->enmClass = RTJSONTOKENCLASS_FALSE;
468	else if (!RTStrNCmp(&szLiteral[0], "true", RT_ELEMENTS(szLiteral)))
469	pToken->enmClass = RTJSONTOKENCLASS_TRUE;
470	else if (!RTStrNCmp(&szLiteral[0], "null", RT_ELEMENTS(szLiteral)))
471	pToken->enmClass = RTJSONTOKENCLASS_NULL;
472	else
473	{
474	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
475	rc = VERR_JSON_MALFORMED;
476	}
477
478	pToken->Pos.iChEnd += cchLiteral;
479	return rc;
480	}
481
482	/**
483	* Get a numerical constant from the tokenizer.
484	*
485	* @returns IPRT status code.
486	* @param pTokenizer The tokenizer state.
487	* @param pToken The uninitialized token.
488	*/
489	static int rtJsonTokenizerGetNumber(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
490	{
491	size_t cchNum = 0;
492	char szTmp[128]; /* Everything larger is not possible to display in signed 64bit. */
493
494	pToken->enmClass = RTJSONTOKENCLASS_NUMBER;
495
496	char ch = rtJsonTokenizerGetCh(pTokenizer);
497	while ( RT_C_IS_DIGIT(ch)
498	&& cchNum < sizeof(szTmp) - 1)
499	{
500	szTmp[cchNum] = ch;
501	cchNum++;
502	rtJsonTokenizerSkipCh(pTokenizer);
503	ch = rtJsonTokenizerGetCh(pTokenizer);
504	}
505
506	int rc = VINF_SUCCESS;
507	if (RT_C_IS_DIGIT(ch) && cchNum >= sizeof(szTmp) - 1)
508	rc = VERR_NUMBER_TOO_BIG;
509	else
510	{
511	szTmp[cchNum] = '\0';
512	rc = RTStrToInt64Ex(&szTmp[0], NULL, 0, &pToken->Class.Number.i64Num);
513	Assert(RT_SUCCESS(rc) \|\| rc == VWRN_NUMBER_TOO_BIG);
514	if (rc == VWRN_NUMBER_TOO_BIG)
515	rc = VERR_NUMBER_TOO_BIG;
516	}
517
518	return rc;
519	}
520
521	/**
522	* Parses a string constant.
523	*
524	* @returns IPRT status code.
525	* @param pTokenizer The tokenizer state.
526	* @param pToken The uninitialized token.
527	*/
528	static int rtJsonTokenizerGetString(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
529	{
530	int rc = VINF_SUCCESS;
531	size_t cchStr = 0;
532	char szTmp[_4K];
533	RT_ZERO(szTmp);
534
535	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\"');
536	rtJsonTokenizerSkipCh(pTokenizer); /* Skip " */
537
538	pToken->enmClass = RTJSONTOKENCLASS_STRING;
539	pToken->Pos = pTokenizer->Pos;
540
541	char ch = rtJsonTokenizerGetCh(pTokenizer);
542	while ( ch != '\"'
543	&& ch != '\0'
544	&& cchStr < sizeof(szTmp) - 1)
545	{
546	if (ch == '\\')
547	{
548	/* Escape sequence, check the next character */
549	rtJsonTokenizerSkipCh(pTokenizer);
550	char chNext = rtJsonTokenizerGetCh(pTokenizer);
551	switch (chNext)
552	{
553	case '\"':
554	szTmp[cchStr] = '\"';
555	break;
556	case '\\':
557	szTmp[cchStr] = '\\';
558	break;
559	case '/':
560	szTmp[cchStr] = '/';
561	break;
562	case '\b':
563	szTmp[cchStr] = '\b';
564	break;
565	case '\n':
566	szTmp[cchStr] = '\n';
567	break;
568	case '\f':
569	szTmp[cchStr] = '\f';
570	break;
571	case '\r':
572	szTmp[cchStr] = '\r';
573	break;
574	case '\t':
575	szTmp[cchStr] = '\t';
576	break;
577	case 'u':
578	rc = VERR_NOT_SUPPORTED;
579	break;
580	default:
581	rc = VERR_JSON_MALFORMED;
582	}
583	}
584	else
585	szTmp[cchStr] = ch;
586	cchStr++;
587	rtJsonTokenizerSkipCh(pTokenizer);
588	ch = rtJsonTokenizerGetCh(pTokenizer);
589	}
590
591	if (rtJsonTokenizerGetCh(pTokenizer) == '\"')
592	rtJsonTokenizerSkipCh(pTokenizer); /* Skip closing " */
593
594	pToken->Class.String.pszStr = RTStrDupN(&szTmp[0], cchStr);
595	if (pToken->Class.String.pszStr)
596	pToken->Pos.iChEnd += cchStr;
597	else
598	rc = VERR_NO_STR_MEMORY;
599	return rc;
600	}
601
602	/**
603	* Get the end of stream token.
604	*
605	* @returns IPRT status code.
606	* @param pTokenizer The tokenizer state.
607	* @param pToken The uninitialized token.
608	*/
609	static int rtJsonTokenizerGetEos(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
610	{
611	Assert(rtJsonTokenizerGetCh(pTokenizer) == '\0');
612
613	pToken->enmClass = RTJSONTOKENCLASS_EOS;
614	pToken->Pos = pTokenizer->Pos;
615	return VINF_SUCCESS;
616	}
617
618	/**
619	* Read the next token from the tokenizer stream.
620	*
621	* @returns IPRT status code.
622	* @param pTokenizer The tokenizer to read from.
623	* @param pToken Uninitialized token to fill the token data into.
624	*/
625	static int rtJsonTokenizerReadNextToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken)
626	{
627	int rc = VINF_SUCCESS;
628
629	/* Skip all eventually existing whitespace and newlines first. */
630	rtJsonTokenizerSkipWhitespace(pTokenizer);
631
632	char ch = rtJsonTokenizerGetCh(pTokenizer);
633	if (RT_C_IS_ALPHA(ch))
634	rc = rtJsonTokenizerGetLiteral(pTokenizer, pToken);
635	else if (RT_C_IS_DIGIT(ch))
636	rc = rtJsonTokenizerGetNumber(pTokenizer, pToken);
637	else if (ch == '\"')
638	rc = rtJsonTokenizerGetString(pTokenizer, pToken);
639	else if (ch == '\0')
640	rc = rtJsonTokenizerGetEos(pTokenizer, pToken);
641	else if (ch == '{')
642	{
643	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_OBJECT;
644	rtJsonTokenizerSkipCh(pTokenizer);
645	}
646	else if (ch == '}')
647	{
648	pToken->enmClass = RTJSONTOKENCLASS_END_OBJECT;
649	rtJsonTokenizerSkipCh(pTokenizer);
650	}
651	else if (ch == '[')
652	{
653	pToken->enmClass = RTJSONTOKENCLASS_BEGIN_ARRAY;
654	rtJsonTokenizerSkipCh(pTokenizer);
655	}
656	else if (ch == ']')
657	{
658	pToken->enmClass = RTJSONTOKENCLASS_END_ARRAY;
659	rtJsonTokenizerSkipCh(pTokenizer);
660	}
661	else if (ch == ':')
662	{
663	pToken->enmClass = RTJSONTOKENCLASS_NAME_SEPARATOR;
664	rtJsonTokenizerSkipCh(pTokenizer);
665	}
666	else if (ch == ',')
667	{
668	pToken->enmClass = RTJSONTOKENCLASS_VALUE_SEPARATOR;
669	rtJsonTokenizerSkipCh(pTokenizer);
670	}
671	else
672	{
673	pToken->enmClass = RTJSONTOKENCLASS_INVALID;
674	rc = VERR_JSON_MALFORMED;
675	}
676
677	return rc;
678	}
679
680	/**
681	* Create a new tokenizer.
682	*
683	* @returns IPRT status code.
684	* @param pTokenizer The tokenizer state to initialize.
685	* @param pfnRead Read callback for the input stream.
686	* @param pvUser Opaque user data to pass to the callback.
687	*/
688	static int rtJsonTokenizerInit(PRTJSONTOKENIZER pTokenizer, PFNRTJSONTOKENIZERREAD pfnRead, void *pvUser)
689	{
690	pTokenizer->pfnRead = pfnRead;
691	pTokenizer->pvUser = pvUser;
692	pTokenizer->offInput = 0;
693	pTokenizer->cbBuf = 0;
694	pTokenizer->offBuf = 0;
695	pTokenizer->Pos.iLine = 1;
696	pTokenizer->Pos.iChStart = 1;
697	pTokenizer->Pos.iChEnd = 1;
698	pTokenizer->pTokenCurr = &pTokenizer->Token1;
699	pTokenizer->pTokenNext = &pTokenizer->Token2;
700
701	RT_ZERO(pTokenizer->achBuf);
702
703	/* Fill the input buffer. */
704	int rc = rtJsonTokenizerRead(pTokenizer);
705
706	/* Fill the tokenizer with two first tokens. */
707	if (RT_SUCCESS(rc))
708	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
709	if (RT_SUCCESS(rc))
710	rc = rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
711
712	return rc;
713	}
714
715	/**
716	* Destroys a given tokenizer state.
717	*
718	* @returns nothing.
719	* @param pTokenizer The tokenizer to destroy.
720	*/
721	static void rtJsonTokenizerDestroy(PRTJSONTOKENIZER pTokenizer)
722	{
723	RT_NOREF_PV(pTokenizer);
724	}
725
726	/**
727	* Get the current token in the input stream.
728	*
729	* @returns Pointer to the next token in the stream.
730	* @param pTokenizer The tokenizer state.
731	* @param ppToken Where to store the pointer to the current token on success.
732	*/
733	DECLINLINE(int) rtJsonTokenizerGetToken(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN *ppToken)
734	{
735	*ppToken = pTokenizer->pTokenCurr;
736	return VINF_SUCCESS;
737	}
738
739	/**
740	* Consume the current token advancing to the next in the stream.
741	*
742	* @returns nothing.
743	* @param pTokenizer The tokenizer state.
744	*/
745	static void rtJsonTokenizerConsume(PRTJSONTOKENIZER pTokenizer)
746	{
747	PRTJSONTOKEN pTokenTmp = pTokenizer->pTokenCurr;
748
749	/* Switch next token to current token and read in the next token. */
750	pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
751	pTokenizer->pTokenNext = pTokenTmp;
752	rtJsonTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
753	}
754
755	/**
756	* Consumes the current token if it matches the given class returning an indicator.
757	*
758	* @returns true if the class matched and the token was consumed.
759	* @retval false otherwise.
760	* @param pTokenizer The tokenizer state.
761	* @param enmClass The token class to match against.
762	*/
763	static bool rtJsonTokenizerConsumeIfMatched(PRTJSONTOKENIZER pTokenizer, RTJSONTOKENCLASS enmClass)
764	{
765	PRTJSONTOKEN pToken = NULL;
766	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
767	AssertRC(rc);
768
769	if (pToken->enmClass == enmClass)
770	{
771	rtJsonTokenizerConsume(pTokenizer);
772	return true;
773	}
774
775	return false;
776	}
777
778	/**
779	* Destroys a given JSON value releasing the reference to all child values.
780	*
781	* @returns nothing.
782	* @param pThis The JSON value to destroy.
783	*/
784	static void rtJsonValDestroy(PRTJSONVALINT pThis)
785	{
786	switch (pThis->enmType)
787	{
788	case RTJSONVALTYPE_OBJECT:
789	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
790	{
791	RTStrFree(pThis->Type.Object.papszNames[i]);
792	RTJsonValueRelease(pThis->Type.Object.papValues[i]);
793	}
794	RTMemFree(pThis->Type.Object.papszNames);
795	RTMemFree(pThis->Type.Object.papValues);
796	break;
797	case RTJSONVALTYPE_ARRAY:
798	for (unsigned i = 0; i < pThis->Type.Array.cItems; i++)
799	RTJsonValueRelease(pThis->Type.Array.papItems[i]);
800	RTMemFree(pThis->Type.Array.papItems);
801	break;
802	case RTJSONVALTYPE_STRING:
803	RTStrFree(pThis->Type.String.pszStr);
804	break;
805	case RTJSONVALTYPE_NUMBER:
806	case RTJSONVALTYPE_NULL:
807	case RTJSONVALTYPE_TRUE:
808	case RTJSONVALTYPE_FALSE:
809	/* nothing to do. */
810	break;
811	default:
812	AssertMsgFailed(("Invalid JSON value type: %u\n", pThis->enmType));
813	}
814	RTMemFree(pThis);
815	}
816
817	/**
818	* Creates a new JSON value with the given type.
819	*
820	* @returns Pointer to JSON value on success, NULL if out of memory.
821	* @param enmType The JSON value type.
822	*/
823	static PRTJSONVALINT rtJsonValueCreate(RTJSONVALTYPE enmType)
824	{
825	PRTJSONVALINT pThis = (PRTJSONVALINT)RTMemAllocZ(sizeof(RTJSONVALINT));
826	if (RT_LIKELY(pThis))
827	{
828	pThis->enmType = enmType;
829	pThis->cRefs = 1;
830	}
831
832	return pThis;
833	}
834
835	/**
836	* Parses an JSON array.
837	*
838	* @returns IPRT status code.
839	* @param pTokenizer The tokenizer to use.
840	* @param pJsonVal The JSON array value to fill in.
841	* @param pErrInfo Where to store extended error info. Optional.
842	*/
843	static int rtJsonParseArray(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
844	{
845	int rc = VINF_SUCCESS;
846	PRTJSONTOKEN pToken = NULL;
847	uint32_t cItems = 0;
848	uint32_t cItemsMax = 0;
849	PRTJSONVALINT *papItems = NULL;
850
851	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
852	while ( RT_SUCCESS(rc)
853	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY
854	&& pToken->enmClass != RTJSONTOKENCLASS_EOS)
855	{
856	PRTJSONVALINT pVal = NULL;
857	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
858	if (RT_SUCCESS(rc))
859	{
860	if (cItems == cItemsMax)
861	{
862	cItemsMax += 10;
863	PRTJSONVALINT papItemsNew = (PRTJSONVALINT )RTMemRealloc(papItems, cItemsMax * sizeof(PRTJSONVALINT));
864	if (RT_UNLIKELY(!papItemsNew))
865	{
866	rc = VERR_NO_MEMORY;
867	break;
868	}
869	papItems = papItemsNew;
870	}
871
872	Assert(cItems < cItemsMax);
873	papItems[cItems] = pVal;
874	cItems++;
875	}
876
877	/* Skip value separator and continue with next token. */
878	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
879	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
880
881	if ( RT_SUCCESS(rc)
882	&& !fSkippedSep
883	&& pToken->enmClass != RTJSONTOKENCLASS_END_ARRAY)
884	rc = VERR_JSON_MALFORMED;
885	}
886
887	if (RT_SUCCESS(rc))
888	{
889	if (pToken->enmClass == RTJSONTOKENCLASS_END_ARRAY)
890	{
891	rtJsonTokenizerConsume(pTokenizer);
892	pJsonVal->Type.Array.cItems = cItems;
893	pJsonVal->Type.Array.papItems = papItems;
894	}
895	else
896	rc = VERR_JSON_MALFORMED;
897	}
898
899	if (RT_FAILURE(rc))
900	{
901	for (uint32_t i = 0; i < cItems; i++)
902	RTJsonValueRelease(papItems[i]);
903	RTMemFree(papItems);
904	}
905
906	return rc;
907	}
908
909	/**
910	* Parses an JSON object.
911	*
912	* @returns IPRT status code.
913	* @param pTokenizer The tokenizer to use.
914	* @param pJsonVal The JSON object value to fill in.
915	* @param pErrInfo Where to store extended error info. Optional.
916	*/
917	static int rtJsonParseObject(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT pJsonVal, PRTERRINFO pErrInfo)
918	{
919	int rc = VINF_SUCCESS;
920	PRTJSONTOKEN pToken = NULL;
921	uint32_t cMembers = 0;
922	uint32_t cMembersMax = 0;
923	PRTJSONVALINT *papValues = NULL;
924	char **papszNames = NULL;
925
926	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
927	while ( RT_SUCCESS(rc)
928	&& pToken->enmClass == RTJSONTOKENCLASS_STRING)
929	{
930	char *pszName = pToken->Class.String.pszStr;
931
932	rtJsonTokenizerConsume(pTokenizer);
933	if (rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_NAME_SEPARATOR))
934	{
935	PRTJSONVALINT pVal = NULL;
936	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
937	if (RT_SUCCESS(rc))
938	rc = rtJsonParseValue(pTokenizer, pToken, &pVal, pErrInfo);
939	if (RT_SUCCESS(rc))
940	{
941	if (cMembers == cMembersMax)
942	{
943	cMembersMax += 10;
944	PRTJSONVALINT papValuesNew = (PRTJSONVALINT )RTMemRealloc(papValues, cMembersMax * sizeof(PRTJSONVALINT));
945	char papszNamesNew = (char )RTMemRealloc(papValues, cMembersMax * sizeof(char *));
946	if (RT_UNLIKELY(!papValuesNew \|\| !papszNamesNew))
947	{
948	rc = VERR_NO_MEMORY;
949	break;
950	}
951
952	papValues = papValuesNew;
953	papszNames = papszNamesNew;
954	}
955
956	Assert(cMembers < cMembersMax);
957	papszNames[cMembers] = pszName;
958	papValues[cMembers] = pVal;
959	cMembers++;
960
961	/* Skip value separator and continue with next token. */
962	bool fSkippedSep = rtJsonTokenizerConsumeIfMatched(pTokenizer, RTJSONTOKENCLASS_VALUE_SEPARATOR);
963	rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
964
965	if ( RT_SUCCESS(rc)
966	&& !fSkippedSep
967	&& pToken->enmClass != RTJSONTOKENCLASS_END_OBJECT)
968	rc = VERR_JSON_MALFORMED;
969	}
970	}
971	else
972	rc = VERR_JSON_MALFORMED;
973	}
974
975	if (RT_SUCCESS(rc))
976	{
977	if (pToken->enmClass == RTJSONTOKENCLASS_END_OBJECT)
978	{
979	rtJsonTokenizerConsume(pTokenizer);
980	pJsonVal->Type.Object.cMembers = cMembers;
981	pJsonVal->Type.Object.papValues = papValues;
982	pJsonVal->Type.Object.papszNames = papszNames;
983	}
984	else
985	rc = VERR_JSON_MALFORMED;
986	}
987
988	if (RT_FAILURE(rc))
989	{
990	for (uint32_t i = 0; i < cMembers; i++)
991	{
992	RTJsonValueRelease(papValues[i]);
993	RTStrFree(papszNames[i]);
994	}
995	RTMemFree(papValues);
996	RTMemFree(papszNames);
997	}
998
999	return rc;
1000	}
1001
1002	/**
1003	* Parses a single JSON value and returns it on success.
1004	*
1005	* @returns IPRT status code.
1006	* @param pTokenizer The tokenizer to use.
1007	* @param pToken The token to parse.
1008	* @param ppJsonVal Where to store the pointer to the JSON value on success.
1009	* @param pErrInfo Where to store extended error info. Optional.
1010	*/
1011	static int rtJsonParseValue(PRTJSONTOKENIZER pTokenizer, PRTJSONTOKEN pToken,
1012	PRTJSONVALINT *ppJsonVal, PRTERRINFO pErrInfo)
1013	{
1014	int rc = VINF_SUCCESS;
1015	PRTJSONVALINT pVal = NULL;
1016
1017	switch (pToken->enmClass)
1018	{
1019	case RTJSONTOKENCLASS_BEGIN_ARRAY:
1020	rtJsonTokenizerConsume(pTokenizer);
1021	pVal = rtJsonValueCreate(RTJSONVALTYPE_ARRAY);
1022	if (RT_LIKELY(pVal))
1023	rc = rtJsonParseArray(pTokenizer, pVal, pErrInfo);
1024	break;
1025	case RTJSONTOKENCLASS_BEGIN_OBJECT:
1026	rtJsonTokenizerConsume(pTokenizer);
1027	pVal = rtJsonValueCreate(RTJSONVALTYPE_OBJECT);
1028	if (RT_LIKELY(pVal))
1029	rc = rtJsonParseObject(pTokenizer, pVal, pErrInfo);
1030	break;
1031	case RTJSONTOKENCLASS_STRING:
1032	pVal = rtJsonValueCreate(RTJSONVALTYPE_STRING);
1033	if (RT_LIKELY(pVal))
1034	pVal->Type.String.pszStr = pToken->Class.String.pszStr;
1035	rtJsonTokenizerConsume(pTokenizer);
1036	break;
1037	case RTJSONTOKENCLASS_NUMBER:
1038	pVal = rtJsonValueCreate(RTJSONVALTYPE_NUMBER);
1039	if (RT_LIKELY(pVal))
1040	pVal->Type.Number.i64Num = pToken->Class.Number.i64Num;
1041	rtJsonTokenizerConsume(pTokenizer);
1042	break;
1043	case RTJSONTOKENCLASS_NULL:
1044	rtJsonTokenizerConsume(pTokenizer);
1045	pVal = rtJsonValueCreate(RTJSONVALTYPE_NULL);
1046	break;
1047	case RTJSONTOKENCLASS_FALSE:
1048	rtJsonTokenizerConsume(pTokenizer);
1049	pVal = rtJsonValueCreate(RTJSONVALTYPE_FALSE);
1050	break;
1051	case RTJSONTOKENCLASS_TRUE:
1052	rtJsonTokenizerConsume(pTokenizer);
1053	pVal = rtJsonValueCreate(RTJSONVALTYPE_TRUE);
1054	break;
1055	case RTJSONTOKENCLASS_END_ARRAY:
1056	case RTJSONTOKENCLASS_END_OBJECT:
1057	case RTJSONTOKENCLASS_NAME_SEPARATOR:
1058	case RTJSONTOKENCLASS_VALUE_SEPARATOR:
1059	case RTJSONTOKENCLASS_EOS:
1060	default:
1061	/** @todo Error info */
1062	rc = VERR_JSON_MALFORMED;
1063	break;
1064	}
1065
1066	if (RT_SUCCESS(rc))
1067	{
1068	if (pVal)
1069	*ppJsonVal = pVal;
1070	else
1071	rc = VERR_NO_MEMORY;
1072	}
1073	else if (pVal)
1074	rtJsonValDestroy(pVal);
1075
1076	return rc;
1077	}
1078
1079	/**
1080	* Entry point to parse a JSON document.
1081	*
1082	* @returns IPRT status code.
1083	* @param pTokenizer The tokenizer state.
1084	* @param ppJsonVal Where to store the root JSON value on success.
1085	* @param pErrInfo Where to store extended error info. Optional.
1086	*/
1087	static int rtJsonParse(PRTJSONTOKENIZER pTokenizer, PRTJSONVALINT *ppJsonVal,
1088	PRTERRINFO pErrInfo)
1089	{
1090	PRTJSONTOKEN pToken = NULL;
1091	int rc = rtJsonTokenizerGetToken(pTokenizer, &pToken);
1092	if (RT_SUCCESS(rc))
1093	rc = rtJsonParseValue(pTokenizer, pToken, ppJsonVal, pErrInfo);
1094
1095	return rc;
1096	}
1097
1098	/**
1099	* Read callback for RTJsonParseFromBuf().
1100	*/
1101	static DECLCALLBACK(int) rtJsonTokenizerParseFromBuf(void *pvUser, size_t offInput,
1102	void *pvBuf, size_t cbBuf,
1103	size_t *pcbRead)
1104	{
1105	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1106	size_t cbLeft = offInput < pArgs->cbData ? pArgs->cbData - offInput : 0;
1107
1108	if (cbLeft)
1109	memcpy(pvBuf, &pArgs->u.pbBuf[offInput], RT_MIN(cbLeft, cbBuf));
1110
1111	*pcbRead = RT_MIN(cbLeft, cbBuf);
1112
1113	return VINF_SUCCESS;
1114	}
1115
1116	/**
1117	* Read callback for RTJsonParseFromString().
1118	*/
1119	static DECLCALLBACK(int) rtJsonTokenizerParseFromString(void *pvUser, size_t offInput,
1120	void *pvBuf, size_t cbBuf,
1121	size_t *pcbRead)
1122	{
1123	const char pszStr = (const char )pvUser;
1124	size_t cchStr = strlen(pszStr) + 1; /* Include zero terminator. */
1125	size_t cbLeft = offInput < cchStr ? cchStr - offInput : 0;
1126
1127	if (cbLeft)
1128	memcpy(pvBuf, &pszStr[offInput], RT_MIN(cbLeft, cbBuf));
1129
1130	*pcbRead = RT_MIN(cbLeft, cbBuf);
1131
1132	return VINF_SUCCESS;
1133	}
1134
1135	/**
1136	* Read callback for RTJsonParseFromFile().
1137	*/
1138	static DECLCALLBACK(int) rtJsonTokenizerParseFromFile(void *pvUser, size_t offInput,
1139	void *pvBuf, size_t cbBuf,
1140	size_t *pcbRead)
1141	{
1142	PRTJSONREADERARGS pArgs = (PRTJSONREADERARGS)pvUser;
1143
1144	RT_NOREF_PV(offInput);
1145
1146	size_t cbRead = 0;
1147	int rc = RTStrmReadEx(pArgs->u.hStream, pvBuf, cbBuf, &cbRead);
1148	if (RT_SUCCESS(rc))
1149	*pcbRead = cbRead;
1150
1151	return rc;
1152	}
1153
1154	RTDECL(int) RTJsonParseFromBuf(PRTJSONVAL phJsonVal, const uint8_t *pbBuf, size_t cbBuf,
1155	PRTERRINFO pErrInfo)
1156	{
1157	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1158	AssertPtrReturn(pbBuf, VERR_INVALID_POINTER);
1159	AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
1160
1161	RTJSONTOKENIZER Tokenizer;
1162	RTJSONREADERARGS Args;
1163	Args.cbData = cbBuf;
1164	Args.u.pbBuf = pbBuf;
1165
1166	int rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromBuf, &Args);
1167	if (RT_SUCCESS(rc))
1168	{
1169	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1170	rtJsonTokenizerDestroy(&Tokenizer);
1171	}
1172
1173	return rc;
1174	}
1175
1176	RTDECL(int) RTJsonParseFromString(PRTJSONVAL phJsonVal, const char *pszStr, PRTERRINFO pErrInfo)
1177	{
1178	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1179	AssertPtrReturn(pszStr, VERR_INVALID_POINTER);
1180
1181	RTJSONTOKENIZER Tokenizer;
1182	int rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromString, (void *)pszStr);
1183	if (RT_SUCCESS(rc))
1184	{
1185	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1186	rtJsonTokenizerDestroy(&Tokenizer);
1187	}
1188
1189	return rc;
1190	}
1191
1192	RTDECL(int) RTJsonParseFromFile(PRTJSONVAL phJsonVal, const char *pszFilename, PRTERRINFO pErrInfo)
1193	{
1194	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1195	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1196
1197	int rc = VINF_SUCCESS;
1198	RTJSONREADERARGS Args;
1199
1200	Args.cbData = 0;
1201	rc = RTStrmOpen(pszFilename, "r", &Args.u.hStream);
1202	if (RT_SUCCESS(rc))
1203	{
1204	RTJSONTOKENIZER Tokenizer;
1205
1206	rc = rtJsonTokenizerInit(&Tokenizer, rtJsonTokenizerParseFromFile, &Args);
1207	if (RT_SUCCESS(rc))
1208	{
1209	rc = rtJsonParse(&Tokenizer, phJsonVal, pErrInfo);
1210	rtJsonTokenizerDestroy(&Tokenizer);
1211	}
1212	RTStrmClose(Args.u.hStream);
1213	}
1214
1215	return rc;
1216	}
1217
1218	RTDECL(uint32_t) RTJsonValueRetain(RTJSONVAL hJsonVal)
1219	{
1220	PRTJSONVALINT pThis = hJsonVal;
1221	AssertPtrReturn(pThis, UINT32_MAX);
1222
1223	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1224	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1225	return cRefs;
1226	}
1227
1228	RTDECL(uint32_t) RTJsonValueRelease(RTJSONVAL hJsonVal)
1229	{
1230	PRTJSONVALINT pThis = hJsonVal;
1231	if (pThis == NIL_RTJSONVAL)
1232	return 0;
1233	AssertPtrReturn(pThis, UINT32_MAX);
1234
1235	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1236	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1237	if (cRefs == 0)
1238	rtJsonValDestroy(pThis);
1239	return cRefs;
1240	}
1241
1242	RTDECL(RTJSONVALTYPE) RTJsonValueGetType(RTJSONVAL hJsonVal)
1243	{
1244	PRTJSONVALINT pThis = hJsonVal;
1245	if (pThis == NIL_RTJSONVAL)
1246	return RTJSONVALTYPE_INVALID;
1247	AssertPtrReturn(pThis, RTJSONVALTYPE_INVALID);
1248
1249	return pThis->enmType;
1250	}
1251
1252	RTDECL(const char *) RTJsonValueGetString(RTJSONVAL hJsonVal)
1253	{
1254	PRTJSONVALINT pThis = hJsonVal;
1255	AssertReturn(pThis != NIL_RTJSONVAL, NULL);
1256	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, NULL);
1257
1258	return pThis->Type.String.pszStr;
1259	}
1260
1261	RTDECL(int) RTJsonValueQueryString(RTJSONVAL hJsonVal, const char **ppszStr)
1262	{
1263	PRTJSONVALINT pThis = hJsonVal;
1264	AssertPtrReturn(ppszStr, VERR_INVALID_POINTER);
1265	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1266	AssertReturn(pThis->enmType == RTJSONVALTYPE_STRING, VERR_JSON_VALUE_INVALID_TYPE);
1267
1268	*ppszStr = pThis->Type.String.pszStr;
1269	return VINF_SUCCESS;
1270	}
1271
1272	RTDECL(int) RTJsonValueQueryInteger(RTJSONVAL hJsonVal, int64_t *pi64Num)
1273	{
1274	PRTJSONVALINT pThis = hJsonVal;
1275	AssertPtrReturn(pi64Num, VERR_INVALID_POINTER);
1276	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1277	AssertReturn(pThis->enmType == RTJSONVALTYPE_NUMBER, VERR_JSON_VALUE_INVALID_TYPE);
1278
1279	*pi64Num = pThis->Type.Number.i64Num;
1280	return VINF_SUCCESS;
1281	}
1282
1283	RTDECL(int) RTJsonValueQueryByName(RTJSONVAL hJsonVal, const char *pszName, PRTJSONVAL phJsonVal)
1284	{
1285	PRTJSONVALINT pThis = hJsonVal;
1286	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
1287	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1288	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1289	AssertReturn(pThis->enmType == RTJSONVALTYPE_OBJECT, VERR_JSON_VALUE_INVALID_TYPE);
1290
1291	int rc = VERR_NOT_FOUND;
1292	for (unsigned i = 0; i < pThis->Type.Object.cMembers; i++)
1293	{
1294	if (!RTStrCmp(pThis->Type.Object.papszNames[i], pszName))
1295	{
1296	RTJsonValueRetain(pThis->Type.Object.papValues[i]);
1297	*phJsonVal = pThis->Type.Object.papValues[i];
1298	rc = VINF_SUCCESS;
1299	break;
1300	}
1301	}
1302
1303	return rc;
1304	}
1305
1306	RTDECL(int) RTJsonValueQueryIntegerByName(RTJSONVAL hJsonVal, const char pszName, int64_t pi64Num)
1307	{
1308	RTJSONVAL hJsonValNum = NIL_RTJSONVAL;
1309	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValNum);
1310	if (RT_SUCCESS(rc))
1311	{
1312	rc = RTJsonValueQueryInteger(hJsonValNum, pi64Num);
1313	RTJsonValueRelease(hJsonValNum);
1314	}
1315
1316	return rc;
1317	}
1318
1319	RTDECL(int) RTJsonValueQueryStringByName(RTJSONVAL hJsonVal, const char pszName, char *ppszStr)
1320	{
1321	RTJSONVAL hJsonValStr = NIL_RTJSONVAL;
1322	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValStr);
1323	if (RT_SUCCESS(rc))
1324	{
1325	const char *pszStr = NULL;
1326	rc = RTJsonValueQueryString(hJsonValStr, &pszStr);
1327	if (RT_SUCCESS(rc))
1328	{
1329	*ppszStr = RTStrDup(pszStr);
1330	if (!*ppszStr)
1331	rc = VERR_NO_STR_MEMORY;
1332	}
1333	RTJsonValueRelease(hJsonValStr);
1334	}
1335
1336	return rc;
1337	}
1338
1339	RTDECL(int) RTJsonValueQueryBooleanByName(RTJSONVAL hJsonVal, const char pszName, bool pfBoolean)
1340	{
1341	AssertPtrReturn(pfBoolean, VERR_INVALID_POINTER);
1342
1343	RTJSONVAL hJsonValBool = NIL_RTJSONVAL;
1344	int rc = RTJsonValueQueryByName(hJsonVal, pszName, &hJsonValBool);
1345	if (RT_SUCCESS(rc))
1346	{
1347	RTJSONVALTYPE enmType = RTJsonValueGetType(hJsonValBool);
1348	if (enmType == RTJSONVALTYPE_TRUE)
1349	*pfBoolean = true;
1350	else if (enmType == RTJSONVALTYPE_FALSE)
1351	*pfBoolean = false;
1352	else
1353	rc = VERR_JSON_VALUE_INVALID_TYPE;
1354	RTJsonValueRelease(hJsonValBool);
1355	}
1356
1357	return rc;
1358	}
1359
1360	RTDECL(unsigned) RTJsonValueGetArraySize(RTJSONVAL hJsonVal)
1361	{
1362	PRTJSONVALINT pThis = hJsonVal;
1363	AssertReturn(pThis != NIL_RTJSONVAL, 0);
1364	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, 0);
1365
1366	return pThis->Type.Array.cItems;
1367	}
1368
1369	RTDECL(int) RTJsonValueQueryArraySize(RTJSONVAL hJsonVal, unsigned *pcItems)
1370	{
1371	PRTJSONVALINT pThis = hJsonVal;
1372	AssertPtrReturn(pcItems, VERR_INVALID_POINTER);
1373	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1374	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1375
1376	*pcItems = pThis->Type.Array.cItems;
1377	return VINF_SUCCESS;
1378	}
1379
1380	RTDECL(int) RTJsonValueQueryByIndex(RTJSONVAL hJsonVal, unsigned idx, PRTJSONVAL phJsonVal)
1381	{
1382	PRTJSONVALINT pThis = hJsonVal;
1383	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1384	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1385	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY, VERR_JSON_VALUE_INVALID_TYPE);
1386	AssertReturn(idx < pThis->Type.Array.cItems, VERR_OUT_OF_RANGE);
1387
1388	RTJsonValueRetain(pThis->Type.Array.papItems[idx]);
1389	*phJsonVal = pThis->Type.Array.papItems[idx];
1390	return VINF_SUCCESS;
1391	}
1392
1393	RTDECL(int) RTJsonIteratorBegin(RTJSONVAL hJsonVal, PRTJSONIT phJsonIt)
1394	{
1395	PRTJSONVALINT pThis = hJsonVal;
1396	AssertPtrReturn(phJsonIt, VERR_INVALID_POINTER);
1397	AssertReturn(pThis != NIL_RTJSONVAL, VERR_INVALID_HANDLE);
1398	AssertReturn(pThis->enmType == RTJSONVALTYPE_ARRAY \|\| pThis->enmType == RTJSONVALTYPE_OBJECT,
1399	VERR_JSON_VALUE_INVALID_TYPE);
1400
1401	PRTJSONITINT pIt = (PRTJSONITINT)RTMemTmpAllocZ(sizeof(RTJSONITINT));
1402	if (RT_UNLIKELY(!pIt))
1403	return VERR_NO_MEMORY;
1404
1405	RTJsonValueRetain(hJsonVal);
1406	pIt->pJsonVal = pThis;
1407	pIt->idxCur = 0;
1408	*phJsonIt = pIt;
1409
1410	return VINF_SUCCESS;
1411	}
1412
1413	RTDECL(int) RTJsonIteratorQueryValue(RTJSONIT hJsonIt, PRTJSONVAL phJsonVal, const char **ppszName)
1414	{
1415	PRTJSONITINT pIt = hJsonIt;
1416	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1417	AssertPtrReturn(phJsonVal, VERR_INVALID_POINTER);
1418
1419	int rc = VINF_SUCCESS;
1420	PRTJSONVALINT pThis = pIt->pJsonVal;
1421	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1422	{
1423	if (pIt->idxCur < pThis->Type.Array.cItems)
1424	{
1425	if (ppszName)
1426	*ppszName = NULL;
1427
1428	RTJsonValueRetain(pThis->Type.Array.papItems[pIt->idxCur]);
1429	*phJsonVal = pThis->Type.Array.papItems[pIt->idxCur];
1430	}
1431	else
1432	rc = VERR_JSON_ITERATOR_END;
1433	}
1434	else
1435	{
1436	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1437
1438	if (pIt->idxCur < pThis->Type.Object.cMembers)
1439	{
1440	if (ppszName)
1441	*ppszName = pThis->Type.Object.papszNames[pIt->idxCur];
1442
1443	RTJsonValueRetain(pThis->Type.Object.papValues[pIt->idxCur]);
1444	*phJsonVal = pThis->Type.Object.papValues[pIt->idxCur];
1445	}
1446	else
1447	rc = VERR_JSON_ITERATOR_END;
1448	}
1449
1450	return rc;
1451	}
1452
1453	RTDECL(int) RTJsonIteratorNext(RTJSONIT hJsonIt)
1454	{
1455	PRTJSONITINT pIt = hJsonIt;
1456	AssertReturn(pIt != NIL_RTJSONIT, VERR_INVALID_HANDLE);
1457
1458	int rc = VINF_SUCCESS;
1459	PRTJSONVALINT pThis = pIt->pJsonVal;
1460	if (pThis->enmType == RTJSONVALTYPE_ARRAY)
1461	{
1462	if (pIt->idxCur < pThis->Type.Array.cItems)
1463	pIt->idxCur++;
1464
1465	if (pIt->idxCur == pThis->Type.Object.cMembers)
1466	rc = VERR_JSON_ITERATOR_END;
1467	}
1468	else
1469	{
1470	Assert(pThis->enmType == RTJSONVALTYPE_OBJECT);
1471
1472	if (pIt->idxCur < pThis->Type.Object.cMembers)
1473	pIt->idxCur++;
1474
1475	if (pIt->idxCur == pThis->Type.Object.cMembers)
1476	rc = VERR_JSON_ITERATOR_END;
1477	}
1478
1479	return rc;
1480	}
1481
1482	RTDECL(void) RTJsonIteratorFree(RTJSONIT hJsonIt)
1483	{
1484	PRTJSONITINT pThis = hJsonIt;
1485	if (pThis == NIL_RTJSONIT)
1486	return;
1487	AssertPtrReturnVoid(pThis);
1488
1489	RTJsonValueRelease(pThis->pJsonVal);
1490	RTMemTmpFree(pThis);
1491	}
1492

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source: vbox/trunk/src/VBox/Runtime/common/misc/json.cpp@ 69222

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