vfschain.cpp@ 44417

Last change on this file since 44417 was 43879, checked in by vboxsync, 12 years ago
Extended RTOnce with termination cleanups. (Changes existing structures and functions.)
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 20.2 KB

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1	/* $Id: vfschain.cpp 43879 2012-11-15 14:49:23Z vboxsync $ */
2	/** @file
3	* IPRT - Virtual File System, Chains.
4	*/
5
6	/*
7	* Copyright (C) 2010 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/vfs.h>
32	#include <iprt/vfslowlevel.h>
33
34	#include <iprt/asm.h>
35	#include <iprt/critsect.h>
36	#include <iprt/err.h>
37	#include <iprt/file.h>
38	#include <iprt/mem.h>
39	#include <iprt/once.h>
40	#include <iprt/param.h>
41	#include <iprt/path.h>
42	#include <iprt/semaphore.h>
43	#include <iprt/string.h>
44
45	#include "internal/file.h"
46	#include "internal/magics.h"
47	//#include "internal/vfs.h"
48
49
50
51	/*******************************************************************************
52	* Global Variables *
53	*******************************************************************************/
54	/** Init the critical section once. */
55	static RTONCE g_rtVfsChainElementInitOnce;
56	/** Critical section protecting g_rtVfsChainElementProviderList. */
57	static RTCRITSECT g_rtVfsChainElementCritSect;
58	/** List of VFS chain element providers (RTVFSCHAINELEMENTREG). */
59	static RTLISTANCHOR g_rtVfsChainElementProviderList;
60
61
62	/**
63	* Initializes the globals via RTOnce.
64	*
65	* @returns IPRT status code
66	* @param pvUser Unused, ignored.
67	*/
68	static DECLCALLBACK(int) rtVfsChainElementRegisterInit(void *pvUser)
69	{
70	NOREF(pvUser);
71	return RTCritSectInit(&g_rtVfsChainElementCritSect);
72	}
73
74
75	RTDECL(int) RTVfsChainElementRegisterProvider(PRTVFSCHAINELEMENTREG pRegRec, bool fFromCtor)
76	{
77	int rc;
78
79	/*
80	* Input validation.
81	*/
82	AssertPtrReturn(pRegRec, VERR_INVALID_POINTER);
83	AssertMsgReturn(pRegRec->uVersion == RTVFSCHAINELEMENTREG_VERSION, ("%#x", pRegRec->uVersion), VERR_INVALID_POINTER);
84	AssertMsgReturn(pRegRec->uEndMarker == RTVFSCHAINELEMENTREG_VERSION, ("%#zx", pRegRec->uEndMarker), VERR_INVALID_POINTER);
85	AssertReturn(pRegRec->fReserved == 0, VERR_INVALID_POINTER);
86	AssertPtrReturn(pRegRec->pszName, VERR_INVALID_POINTER);
87	AssertPtrNullReturn(pRegRec->pfnOpenVfs, VERR_INVALID_POINTER);
88	AssertPtrNullReturn(pRegRec->pfnOpenDir, VERR_INVALID_POINTER);
89	AssertPtrNullReturn(pRegRec->pfnOpenFile, VERR_INVALID_POINTER);
90	AssertPtrNullReturn(pRegRec->pfnOpenIoStream, VERR_INVALID_POINTER);
91	AssertPtrNullReturn(pRegRec->pfnOpenFsStream, VERR_INVALID_POINTER);
92
93	/*
94	* Init and take the lock.
95	*/
96	if (!fFromCtor)
97	{
98	rc = RTOnce(&g_rtVfsChainElementInitOnce, rtVfsChainElementRegisterInit, NULL);
99	if (RT_FAILURE(rc))
100	return rc;
101	rc = RTCritSectEnter(&g_rtVfsChainElementCritSect);
102	if (RT_FAILURE(rc))
103	return rc;
104	}
105
106	/*
107	* Duplicate name?
108	*/
109	rc = VINF_SUCCESS;
110	PRTVFSCHAINELEMENTREG pIterator, pIterNext;
111	RTListForEachSafe(&g_rtVfsChainElementProviderList, pIterator, pIterNext, RTVFSCHAINELEMENTREG, ListEntry)
112	{
113	if (!strcmp(pIterator->pszName, pRegRec->pszName))
114	{
115	AssertMsgFailed(("duplicate name '%s' old=%p new=%p\n", pIterator->pszName, pIterator, pRegRec));
116	rc = VERR_ALREADY_EXISTS;
117	break;
118	}
119	}
120
121	/*
122	* If not, append the record to the list.
123	*/
124	if (RT_SUCCESS(rc))
125	RTListAppend(&g_rtVfsChainElementProviderList, &pRegRec->ListEntry);
126
127	/*
128	* Leave the lock and return.
129	*/
130	if (!fFromCtor)
131	RTCritSectLeave(&g_rtVfsChainElementCritSect);
132	return rc;
133	}
134
135
136	/**
137	* Allocates and initializes an empty spec
138	*
139	* @returns Pointer to the spec on success, NULL on failure.
140	*/
141	static PRTVFSCHAINSPEC rtVfsChainSpecAlloc(void)
142	{
143	PRTVFSCHAINSPEC pSpec = (PRTVFSCHAINSPEC)RTMemTmpAlloc(sizeof(*pSpec));
144	if (pSpec)
145	{
146	pSpec->iActionElement = UINT32_MAX;
147	pSpec->cElements = 0;
148	pSpec->paElements = NULL;
149	}
150	return pSpec;
151	}
152
153
154	/**
155	* Duplicate a spec string.
156	*
157	* This differs from RTStrDupN in that it uses RTMemTmpAlloc instead of
158	* RTMemAlloc.
159	*
160	* @returns String copy on success, NULL on failure.
161	* @param psz The string to duplicate.
162	* @param cch The number of bytes to duplicate.
163	* @param prc The status code variable to set on failure. (Leeps the
164	* code shorter. -lazy bird)
165	*/
166	DECLINLINE(char ) rtVfsChainSpecDupStrN(const char psz, size_t cch, int *prc)
167	{
168	char pszCopy = (char )RTMemTmpAlloc(cch + 1);
169	if (pszCopy)
170	{
171	if (!memchr(psz, '\\', cch))
172	{
173	/* Plain string, copy it raw. */
174	memcpy(pszCopy, psz, cch);
175	pszCopy[cch] = '\0';
176	}
177	else
178	{
179	/* Has escape sequences, must unescape it. */
180	char *pszDst = pszCopy;
181	while (cch)
182	{
183	char ch = *psz++;
184	if (ch == '\\')
185	{
186	char ch2 = psz[2];
187	if (ch2 == '(' \|\| ch2 == ')' \|\| ch2 == '\\' \|\| ch2 == ',')
188	{
189	psz++;
190	ch = ch2;
191	}
192	}
193	*pszDst++ = ch;
194	}
195	*pszDst = '\0';
196	}
197	}
198	else
199	*prc = VERR_NO_TMP_MEMORY;
200	return pszCopy;
201	}
202
203
204	/**
205	* Adds an empty element to the chain specification.
206	*
207	* The caller is responsible for filling it the element attributes.
208	*
209	* @returns Pointer to the new element on success, NULL on failure. The
210	* pointer is only valid till the next call to this function.
211	* @param pSpec The chain specification.
212	* @param prc The status code variable to set on failure. (Leeps the
213	* code shorter. -lazy bird)
214	*/
215	static PRTVFSCHAINELEMSPEC rtVfsChainSpecAddElement(PRTVFSCHAINSPEC pSpec, int *prc)
216	{
217	AssertPtr(pSpec);
218
219	/*
220	* Resize the element table if necessary.
221	*/
222	uint32_t const iElement = pSpec->cElements;
223	if ((iElement % 32) == 0)
224	{
225	PRTVFSCHAINELEMSPEC paNew = (PRTVFSCHAINELEMSPEC)RTMemTmpAlloc((iElement + 32) * sizeof(paNew[0]));
226	if (!paNew)
227	{
228	*prc = VERR_NO_TMP_MEMORY;
229	return NULL;
230	}
231
232	memcpy(paNew, pSpec->paElements, iElement * sizeof(paNew[0]));
233	RTMemTmpFree(pSpec->paElements);
234	pSpec->paElements = paNew;
235	}
236
237	/*
238	* Initialize and add the new element.
239	*/
240	PRTVFSCHAINELEMSPEC pElement = &pSpec->paElements[iElement];
241	pElement->pszProvider = NULL;
242	pElement->enmTypeIn = iElement ? pSpec->paElements[iElement - 1].enmTypeOut : RTVFSOBJTYPE_INVALID;
243	pElement->enmTypeOut = RTVFSOBJTYPE_INVALID;
244	pElement->enmAction = RTVFSCHAINACTION_INVALID;
245	pElement->cArgs = 0;
246	pElement->papszArgs = 0;
247
248	pSpec->cElements = iElement + 1;
249	return pElement;
250	}
251
252
253	/**
254	* Adds an argument to the element spec.
255	*
256	* @returns IPRT status code.
257	* @param pElement The element.
258	* @param psz The start of the argument string.
259	* @param cch The length of the argument string, escape
260	* sequences counted twice.
261	*/
262	static int rtVfsChainSpecElementAddArg(PRTVFSCHAINELEMSPEC pElement, const char *psz, size_t cch)
263	{
264	uint32_t iArg = pElement->cArgs;
265	if ((iArg % 32) == 0)
266	{
267	char papszNew = (char )RTMemTmpAlloc((iArg + 32 + 1) * sizeof(papszNew[0]));
268	if (!papszNew)
269	return VERR_NO_TMP_MEMORY;
270	memcpy(papszNew, pElement->papszArgs, iArg * sizeof(papszNew[0]));
271	RTMemTmpFree(pElement->papszArgs);
272	pElement->papszArgs = papszNew;
273	}
274
275	int rc = VINF_SUCCESS;
276	pElement->papszArgs[iArg] = rtVfsChainSpecDupStrN(psz, cch, &rc);
277	pElement->papszArgs[iArg + 1] = NULL;
278	pElement->cArgs = iArg + 1;
279	return rc;
280	}
281
282
283	RTDECL(void) RTVfsChainSpecFree(PRTVFSCHAINSPEC pSpec)
284	{
285	if (!pSpec)
286	return;
287
288	uint32_t i = pSpec->cElements;
289	while (i-- > 0)
290	{
291	uint32_t iArg = pSpec->paElements[i].cArgs;
292	while (iArg-- > 0)
293	RTMemTmpFree(pSpec->paElements[i].papszArgs[iArg]);
294	RTMemTmpFree(pSpec->paElements[i].papszArgs);
295	RTMemTmpFree(pSpec->paElements[i].pszProvider);
296	}
297
298	RTMemTmpFree(pSpec->paElements);
299	pSpec->paElements = NULL;
300	RTMemTmpFree(pSpec);
301	}
302
303
304	/**
305	* Finds the end of the argument string.
306	*
307	* @returns The offset of the end character relative to @a psz.
308	* @param psz The argument string.
309	*/
310	static size_t rtVfsChainSpecFindArgEnd(const char *psz)
311	{
312	char ch;
313	size_t off = 0;
314	while ( (ch = psz[off]) != '\0'
315	&& ch != ','
316	&& ch != ')'
317	&& ch != '(')
318	{
319	/* check for escape sequences. */
320	if ( ch == '\\'
321	&& (psz[off+1] == '(' \|\| psz[off+1] == ')' \|\| psz[off+1] == '\\' \|\| psz[off+1] == ','))
322	off++;
323	off++;
324	}
325	return off;
326	}
327
328	/**
329	* Look for action.
330	*
331	* @returns Action.
332	* @param pszSpec The current spec position.
333	* @param pcchAction Where to return the length of the action
334	* string.
335	*/
336	static RTVFSCHAINACTION rtVfsChainSpecEatAction(const char pszSpec, size_t pcchAction)
337	{
338	switch (*pszSpec)
339	{
340	case '\|':
341	*pcchAction = 1;
342	return RTVFSCHAINACTION_PASSIVE;
343	case '>':
344	*pcchAction = 1;
345	return RTVFSCHAINACTION_PUSH;
346	default:
347	*pcchAction = 0;
348	return RTVFSCHAINACTION_NONE;
349	}
350	}
351
352
353	RTDECL(int) RTVfsChainSpecParse(const char *pszSpec, uint32_t fFlags, RTVFSCHAINACTION enmLeadingAction,
354	RTVFSCHAINACTION enmTrailingAction,
355	PRTVFSCHAINSPEC ppSpec, const char *ppszError)
356	{
357	AssertPtrNullReturn(ppszError, VERR_INVALID_POINTER);
358	if (ppszError)
359	*ppszError = NULL;
360	AssertPtrReturn(ppSpec, VERR_INVALID_POINTER);
361	*ppSpec = NULL;
362	AssertPtrReturn(pszSpec, VERR_INVALID_POINTER);
363	AssertReturn(!(fFlags & ~RTVFSCHAIN_PF_VALID_MASK), VERR_INVALID_PARAMETER);
364	AssertReturn(enmLeadingAction > RTVFSCHAINACTION_INVALID && enmLeadingAction < RTVFSCHAINACTION_END, VERR_INVALID_PARAMETER);
365
366	/*
367	* Check the start of the specification and allocate an empty return spec.
368	*/
369	if (strncmp(pszSpec, RTVFSCHAIN_SPEC_PREFIX, sizeof(RTVFSCHAIN_SPEC_PREFIX) - 1))
370	return VERR_VFS_CHAIN_NO_PREFIX;
371	pszSpec = RTStrStripL(pszSpec + sizeof(RTVFSCHAIN_SPEC_PREFIX) - 1);
372	if (!*pszSpec)
373	return VERR_VFS_CHAIN_EMPTY;
374
375	PRTVFSCHAINSPEC pSpec = rtVfsChainSpecAlloc();
376	if (!pSpec)
377	return VERR_NO_TMP_MEMORY;
378
379	/*
380	* Parse the spec one element at a time.
381	*/
382	int rc = VINF_SUCCESS;
383	const char *pszSrc = pszSpec;
384	while (*pszSrc && RT_SUCCESS(rc))
385	{
386	/*
387	* Pipe or redirection action symbol, except maybe the first time.
388	* The pipe symbol may occur at the end of the spec.
389	*/
390	size_t cch;
391	RTVFSCHAINACTION enmAction = rtVfsChainSpecEatAction(pszSpec, &cch);
392	if (enmAction != RTVFSCHAINACTION_NONE)
393	{
394	pszSrc = RTStrStripL(pszSrc + cch);
395	if (!*pszSrc)
396	{
397	/* Fail if the caller does not approve of a trailing pipe (all
398	other actions non-trailing). */
399	if ( enmAction != enmTrailingAction
400	&& !(fFlags & RTVFSCHAIN_PF_TRAILING_ACTION_OPTIONAL))
401	rc = VERR_VFS_CHAIN_EXPECTED_ELEMENT;
402	break;
403	}
404
405	/* There can only be one real action atm. */
406	if (enmAction != RTVFSCHAINACTION_PASSIVE)
407	{
408	if (pSpec->iActionElement != UINT32_MAX)
409	{
410	rc = VERR_VFS_CHAIN_MULTIPLE_ACTIONS;
411	break;
412	}
413	pSpec->iActionElement = pSpec->cElements;
414	}
415	}
416	else if (pSpec->cElements > 0)
417	{
418	rc = VERR_VFS_CHAIN_EXPECTED_ACTION;
419	break;
420	}
421
422	/* Check the leading action. */
423	if ( pSpec->cElements == 0
424	&& enmAction != enmLeadingAction
425	&& !(fFlags & RTVFSCHAIN_PF_LEADING_ACTION_OPTIONAL))
426	{
427	rc = VERR_VFS_CHAIN_UNEXPECTED_ACTION_TYPE;
428	break;
429	}
430
431	/*
432	* Ok, there should be an element here so add one to the return struct.
433	*/
434	PRTVFSCHAINELEMSPEC pElement = rtVfsChainSpecAddElement(pSpec, &rc);
435	if (!pElement)
436	break;
437	pElement->enmAction = enmAction;
438
439	/*
440	* First up is the VFS object type followed by a parentheses.
441	*/
442	if (strncmp(pszSrc, "base", cch = 4) == 0)
443	pElement->enmTypeOut = RTVFSOBJTYPE_BASE;
444	else if (strncmp(pszSrc, "vfs", cch = 3) == 0)
445	pElement->enmTypeOut = RTVFSOBJTYPE_VFS;
446	else if (strncmp(pszSrc, "fss", cch = 3) == 0)
447	pElement->enmTypeOut = RTVFSOBJTYPE_FS_STREAM;
448	else if (strncmp(pszSrc, "ios", cch = 3) == 0)
449	pElement->enmTypeOut = RTVFSOBJTYPE_IO_STREAM;
450	else if (strncmp(pszSrc, "dir", cch = 3) == 0)
451	pElement->enmTypeOut = RTVFSOBJTYPE_DIR;
452	else if (strncmp(pszSrc, "file", cch = 4) == 0)
453	pElement->enmTypeOut = RTVFSOBJTYPE_FILE;
454	else if (strncmp(pszSrc, "sym", cch = 3) == 0)
455	pElement->enmTypeOut = RTVFSOBJTYPE_SYMLINK;
456	else
457	{
458	rc = VERR_VFS_CHAIN_UNKNOWN_TYPE;
459	break;
460	}
461	pszSrc += cch;
462
463	/* Check and skip the parentheses. */
464	if (*pszSrc != '(')
465	{
466	rc = VERR_VFS_CHAIN_EXPECTED_LEFT_PARENTHESES;
467	break;
468	}
469	pszSrc = RTStrStripL(pszSrc + 1);
470
471	/*
472	* The name of the element provider.
473	*/
474	cch = rtVfsChainSpecFindArgEnd(pszSrc);
475	if (!cch)
476	{
477	rc = VERR_VFS_CHAIN_EXPECTED_PROVIDER_NAME;
478	break;
479	}
480	pElement->pszProvider = rtVfsChainSpecDupStrN(pszSrc, cch, &rc);
481	if (!pElement->pszProvider)
482	break;
483	pszSrc += cch;
484
485	/*
486	* The arguments.
487	*/
488	while (*pszSrc == ',')
489	{
490	pszSrc = RTStrStripL(pszSrc + 1);
491	cch = rtVfsChainSpecFindArgEnd(pszSrc);
492	rc = rtVfsChainSpecElementAddArg(pElement, pszSrc, cch);
493	pszSrc += cch;
494	}
495
496	/* Must end with a right parentheses. */
497	if (*pszSrc != ')')
498	{
499	rc = VERR_VFS_CHAIN_EXPECTED_RIGHT_PARENTHESES;
500	break;
501	}
502	pszSrc = RTStrStripL(pszSrc + 1);
503	}
504
505	/*
506	* Return the chain on success; Cleanup and set the error indicator on
507	* failure.
508	*/
509	if (RT_SUCCESS(rc))
510	*ppSpec = pSpec;
511	else
512	{
513	if (ppszError)
514	*ppszError = pszSrc;
515	RTVfsChainSpecFree(pSpec);
516	}
517	return rc;
518	}
519
520
521
522
523
524	RTDECL(int) RTVfsChainElementDeregisterProvider(PRTVFSCHAINELEMENTREG pRegRec, bool fFromDtor)
525	{
526	/*
527	* Fend off wildlife.
528	*/
529	if (pRegRec == NULL)
530	return VINF_SUCCESS;
531	AssertPtrReturn(pRegRec, VERR_INVALID_POINTER);
532	AssertMsgReturn(pRegRec->uVersion == RTVFSCHAINELEMENTREG_VERSION, ("%#x", pRegRec->uVersion), VERR_INVALID_POINTER);
533	AssertMsgReturn(pRegRec->uEndMarker == RTVFSCHAINELEMENTREG_VERSION, ("%#zx", pRegRec->uEndMarker), VERR_INVALID_POINTER);
534	AssertPtrReturn(pRegRec->pszName, VERR_INVALID_POINTER);
535
536	/*
537	* Take the lock if that's safe.
538	*/
539	if (!fFromDtor)
540	RTCritSectEnter(&g_rtVfsChainElementCritSect);
541
542	/*
543	* Ok, remove it.
544	*/
545	int rc = VERR_NOT_FOUND;
546	PRTVFSCHAINELEMENTREG pIterator, pIterNext;
547	RTListForEachSafe(&g_rtVfsChainElementProviderList, pIterator, pIterNext, RTVFSCHAINELEMENTREG, ListEntry)
548	{
549	if (pIterator == pRegRec)
550	{
551	RTListNodeRemove(&pRegRec->ListEntry);
552	rc = VINF_SUCCESS;
553	break;
554	}
555	}
556
557	/*
558	* Leave the lock and return.
559	*/
560	if (!fFromDtor)
561	RTCritSectLeave(&g_rtVfsChainElementCritSect);
562	return rc;
563	}
564
565
566	RTDECL(int) RTVfsChainOpenFile(const char pszSpec, uint64_t fOpen, PRTVFSFILE phVfsFile, const char *ppszError)
567	{
568	AssertPtrReturn(pszSpec, VERR_INVALID_POINTER);
569	AssertReturn(*pszSpec != '\0', VERR_INVALID_PARAMETER);
570	AssertPtrReturn(phVfsFile, VERR_INVALID_POINTER);
571	if (ppszError)
572	*ppszError = NULL;
573
574	/*
575	* If it's not a VFS chain spec, treat it as a file.
576	*/
577	int rc;
578	if (strncmp(pszSpec, RTVFSCHAIN_SPEC_PREFIX, sizeof(RTVFSCHAIN_SPEC_PREFIX) - 1))
579	{
580	RTFILE hFile;
581	rc = RTFileOpen(&hFile, pszSpec, fOpen);
582	if (RT_SUCCESS(rc))
583	{
584	RTVFSFILE hVfsFile;
585	rc = RTVfsFileFromRTFile(hFile, fOpen, false /fLeaveOpen/, &hVfsFile);
586	if (RT_SUCCESS(rc))
587	*phVfsFile = hVfsFile;
588	else
589	RTFileClose(hFile);
590	}
591	}
592	else
593	{
594	PRTVFSCHAINSPEC pSpec;
595	rc = RTVfsChainSpecParse(pszSpec,
596	RTVFSCHAIN_PF_NO_REAL_ACTION
597	\| RTVFSCHAIN_PF_LEADING_ACTION_OPTIONAL,
598	RTVFSCHAINACTION_PASSIVE,
599	RTVFSCHAINACTION_NONE,
600	&pSpec,
601	ppszError);
602	if (RT_SUCCESS(rc))
603	{
604	/** @todo implement this when needed. */
605	rc = VERR_NOT_IMPLEMENTED;
606	RTVfsChainSpecFree(pSpec);
607	}
608	}
609	return rc;
610	}
611
612
613	RTDECL(int) RTVfsChainOpenIoStream(const char pszSpec, uint64_t fOpen, PRTVFSIOSTREAM phVfsIos, const char *ppszError)
614	{
615	AssertPtrReturn(pszSpec, VERR_INVALID_POINTER);
616	AssertReturn(*pszSpec != '\0', VERR_INVALID_PARAMETER);
617	AssertPtrReturn(phVfsIos, VERR_INVALID_POINTER);
618	if (ppszError)
619	*ppszError = NULL;
620
621	/*
622	* If it's not a VFS chain spec, treat it as a file.
623	*/
624	int rc;
625	if (strncmp(pszSpec, RTVFSCHAIN_SPEC_PREFIX, sizeof(RTVFSCHAIN_SPEC_PREFIX) - 1))
626	{
627	RTFILE hFile;
628	rc = RTFileOpen(&hFile, pszSpec, fOpen);
629	if (RT_SUCCESS(rc))
630	{
631	RTVFSFILE hVfsFile;
632	rc = RTVfsFileFromRTFile(hFile, fOpen, false /fLeaveOpen/, &hVfsFile);
633	if (RT_SUCCESS(rc))
634	{
635	*phVfsIos = RTVfsFileToIoStream(hVfsFile);
636	RTVfsFileRelease(hVfsFile);
637	}
638	else
639	RTFileClose(hFile);
640	}
641	}
642	else
643	{
644	PRTVFSCHAINSPEC pSpec;
645	rc = RTVfsChainSpecParse(pszSpec,
646	RTVFSCHAIN_PF_NO_REAL_ACTION
647	\| RTVFSCHAIN_PF_LEADING_ACTION_OPTIONAL,
648	RTVFSCHAINACTION_PASSIVE,
649	RTVFSCHAINACTION_NONE,
650	&pSpec,
651	ppszError);
652	if (RT_SUCCESS(rc))
653	{
654
655
656	rc = VERR_NOT_IMPLEMENTED;
657	RTVfsChainSpecFree(pSpec);
658	}
659	}
660	return rc;
661	}
662
663
664
665	RTDECL(bool) RTVfsChainIsSpec(const char *pszSpec)
666	{
667	return pszSpec
668	&& strcmp(pszSpec, RTVFSCHAIN_SPEC_PREFIX) == 0;
669	}
670

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source: vbox/trunk/src/VBox/Runtime/common/vfs/vfschain.cpp@ 44417

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