manifest3.cpp@ 72426

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1	/* $Id: manifest3.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
2	/** @file
3	* IPRT - Manifest, the bits with the most dependencies.
4	*/
5
6	/*
7	* Copyright (C) 2010-2017 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 "internal/iprt.h"
32	#include <iprt/manifest.h>
33
34	#include <iprt/alloca.h>
35	#include <iprt/asm.h>
36	#include <iprt/assert.h>
37	#include <iprt/err.h>
38	#include <iprt/file.h>
39	#include <iprt/md5.h>
40	#include <iprt/mem.h>
41	#include <iprt/sha.h>
42	#include <iprt/string.h>
43	#include <iprt/vfs.h>
44	#include <iprt/vfslowlevel.h>
45	#include <iprt/zero.h>
46
47
48	/*********************************************************************************************************************************
49	* Structures and Typedefs *
50	*********************************************************************************************************************************/
51	/**
52	* Hashes data.
53	*
54	* Used when hashing a file, stream or similar.
55	*/
56	typedef struct RTMANIFESTHASHES
57	{
58	/** The desired attribute types.
59	* Only the hashes indicated by this will be calculated. */
60	uint32_t fAttrs;
61	/** The size. */
62	RTFOFF cbStream;
63
64	/** The MD5 context. */
65	RTMD5CONTEXT Md5Ctx;
66	/** The SHA-1 context. */
67	RTSHA1CONTEXT Sha1Ctx;
68	/** The SHA-256 context. */
69	RTSHA256CONTEXT Sha256Ctx;
70	/** The SHA-512 context. */
71	RTSHA512CONTEXT Sha512Ctx;
72
73	/** The MD5 digest. */
74	uint8_t abMd5Digest[RTMD5_HASH_SIZE];
75	/** The SHA-1 digest. */
76	uint8_t abSha1Digest[RTSHA1_HASH_SIZE];
77	/** The SHA-256 digest. */
78	uint8_t abSha256Digest[RTSHA256_HASH_SIZE];
79	/** The SHA-512 digest. */
80	uint8_t abSha512Digest[RTSHA512_HASH_SIZE];
81	} RTMANIFESTHASHES;
82	/** Pointer to a the hashes for a stream. */
83	typedef RTMANIFESTHASHES *PRTMANIFESTHASHES;
84
85
86	/**
87	* The internal data of a manifest passthru I/O stream.
88	*/
89	typedef struct RTMANIFESTPTIOS
90	{
91	/** The stream we're reading from or writing to. */
92	RTVFSIOSTREAM hVfsIos;
93	/** The hashes. */
94	PRTMANIFESTHASHES pHashes;
95	/** The current hash position. */
96	RTFOFF offCurPos;
97	/** Whether we're reading or writing. */
98	bool fReadOrWrite;
99	/** Whether we've already added the entry to the manifest. */
100	bool fAddedEntry;
101	/** The entry name. */
102	char *pszEntry;
103	/** The manifest to add the entry to. */
104	RTMANIFEST hManifest;
105	} RTMANIFESTPTIOS;
106	/** Pointer to a the internal data of a manifest passthru I/O stream. */
107	typedef RTMANIFESTPTIOS *PRTMANIFESTPTIOS;
108
109
110
111	/**
112	* Creates a hashes structure.
113	*
114	* @returns Pointer to a hashes structure.
115	* @param fAttrs The desired hashes, RTMANIFEST_ATTR_XXX.
116	*/
117	static PRTMANIFESTHASHES rtManifestHashesCreate(uint32_t fAttrs)
118	{
119	PRTMANIFESTHASHES pHashes = (PRTMANIFESTHASHES)RTMemTmpAllocZ(sizeof(*pHashes));
120	if (pHashes)
121	{
122	pHashes->fAttrs = fAttrs;
123	/pHashes->cbStream = 0;/
124	if (fAttrs & RTMANIFEST_ATTR_MD5)
125	RTMd5Init(&pHashes->Md5Ctx);
126	if (fAttrs & RTMANIFEST_ATTR_SHA1)
127	RTSha1Init(&pHashes->Sha1Ctx);
128	if (fAttrs & RTMANIFEST_ATTR_SHA256)
129	RTSha256Init(&pHashes->Sha256Ctx);
130	if (fAttrs & RTMANIFEST_ATTR_SHA512)
131	RTSha512Init(&pHashes->Sha512Ctx);
132	}
133	return pHashes;
134	}
135
136
137	/**
138	* Updates the hashes with a block of data.
139	*
140	* @param pHashes The hashes structure.
141	* @param pvBuf The data block.
142	* @param cbBuf The size of the data block.
143	*/
144	static void rtManifestHashesUpdate(PRTMANIFESTHASHES pHashes, void const *pvBuf, size_t cbBuf)
145	{
146	pHashes->cbStream += cbBuf;
147	if (pHashes->fAttrs & RTMANIFEST_ATTR_MD5)
148	RTMd5Update(&pHashes->Md5Ctx, pvBuf, cbBuf);
149	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA1)
150	RTSha1Update(&pHashes->Sha1Ctx, pvBuf, cbBuf);
151	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA256)
152	RTSha256Update(&pHashes->Sha256Ctx, pvBuf, cbBuf);
153	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA512)
154	RTSha512Update(&pHashes->Sha512Ctx, pvBuf, cbBuf);
155	}
156
157
158	/**
159	* Finalizes all the hashes.
160	*
161	* @param pHashes The hashes structure.
162	*/
163	static void rtManifestHashesFinal(PRTMANIFESTHASHES pHashes)
164	{
165	if (pHashes->fAttrs & RTMANIFEST_ATTR_MD5)
166	RTMd5Final(pHashes->abMd5Digest, &pHashes->Md5Ctx);
167	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA1)
168	RTSha1Final(&pHashes->Sha1Ctx, pHashes->abSha1Digest);
169	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA256)
170	RTSha256Final(&pHashes->Sha256Ctx, pHashes->abSha256Digest);
171	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA512)
172	RTSha512Final(&pHashes->Sha512Ctx, pHashes->abSha512Digest);
173	}
174
175
176	/**
177	* Adds the hashes to a manifest entry.
178	*
179	* @returns IPRT status code.
180	* @param pHashes The hashes structure.
181	* @param hManifest The manifest to add them to.
182	* @param pszEntry The entry name.
183	*/
184	static int rtManifestHashesSetAttrs(PRTMANIFESTHASHES pHashes, RTMANIFEST hManifest, const char *pszEntry)
185	{
186	char szValue[RTSHA512_DIGEST_LEN + 8];
187	int rc = VINF_SUCCESS;
188	int rc2;
189
190	if (pHashes->fAttrs & RTMANIFEST_ATTR_SIZE)
191	{
192	RTStrPrintf(szValue, sizeof(szValue), "%RU64", (uint64_t)pHashes->cbStream);
193	rc2 = RTManifestEntrySetAttr(hManifest, pszEntry, "SIZE", szValue, RTMANIFEST_ATTR_SIZE);
194	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
195	rc = rc2;
196	}
197
198	if (pHashes->fAttrs & RTMANIFEST_ATTR_MD5)
199	{
200	rc2 = RTMd5ToString(pHashes->abMd5Digest, szValue, sizeof(szValue));
201	if (RT_SUCCESS(rc2))
202	rc2 = RTManifestEntrySetAttr(hManifest, pszEntry, "MD5", szValue, RTMANIFEST_ATTR_MD5);
203	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
204	rc = rc2;
205	}
206
207	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA1)
208	{
209	rc2 = RTSha1ToString(pHashes->abSha1Digest, szValue, sizeof(szValue));
210	if (RT_SUCCESS(rc2))
211	rc2 = RTManifestEntrySetAttr(hManifest, pszEntry, "SHA1", szValue, RTMANIFEST_ATTR_SHA1);
212	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
213	rc = rc2;
214	}
215
216	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA256)
217	{
218	rc2 = RTSha256ToString(pHashes->abSha256Digest, szValue, sizeof(szValue));
219	if (RT_SUCCESS(rc2))
220	rc2 = RTManifestEntrySetAttr(hManifest, pszEntry, "SHA256", szValue, RTMANIFEST_ATTR_SHA256);
221	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
222	rc = rc2;
223	}
224
225	if (pHashes->fAttrs & RTMANIFEST_ATTR_SHA512)
226	{
227	rc2 = RTSha512ToString(pHashes->abSha512Digest, szValue, sizeof(szValue));
228	if (RT_SUCCESS(rc2))
229	rc2 = RTManifestEntrySetAttr(hManifest, pszEntry, "SHA512", szValue, RTMANIFEST_ATTR_SHA512);
230	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
231	rc = rc2;
232	}
233	return rc;
234	}
235
236
237	/**
238	* Destroys the hashes.
239	*
240	* @param pHashes The hashes structure. NULL is ignored.
241	*/
242	static void rtManifestHashesDestroy(PRTMANIFESTHASHES pHashes)
243	{
244	RTMemTmpFree(pHashes);
245	}
246
247
248
249	/*
250	*
251	* M a n i f e s t p a s s t h r u I / O s t r e a m
252	* M a n i f e s t p a s s t h r u I / O s t r e a m
253	* M a n i f e s t p a s s t h r u I / O s t r e a m
254	*
255	*/
256
257
258	/**
259	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
260	*/
261	static DECLCALLBACK(int) rtManifestPtIos_Close(void *pvThis)
262	{
263	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
264
265	int rc = VINF_SUCCESS;
266	if (!pThis->fAddedEntry)
267	{
268	rtManifestHashesFinal(pThis->pHashes);
269	rc = rtManifestHashesSetAttrs(pThis->pHashes, pThis->hManifest, pThis->pszEntry);
270	}
271
272	RTVfsIoStrmRelease(pThis->hVfsIos);
273	pThis->hVfsIos = NIL_RTVFSIOSTREAM;
274	rtManifestHashesDestroy(pThis->pHashes);
275	pThis->pHashes = NULL;
276	RTStrFree(pThis->pszEntry);
277	pThis->pszEntry = NULL;
278	RTManifestRelease(pThis->hManifest);
279	pThis->hManifest = NIL_RTMANIFEST;
280
281	return rc;
282	}
283
284
285	/**
286	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
287	*/
288	static DECLCALLBACK(int) rtManifestPtIos_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
289	{
290	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
291	return RTVfsIoStrmQueryInfo(pThis->hVfsIos, pObjInfo, enmAddAttr);
292	}
293
294	/**
295	* Updates the hashes with a scather/gather buffer.
296	*
297	* @param pThis The passthru I/O stream instance data.
298	* @param pSgBuf The scather/gather buffer.
299	* @param cbLeft The number of bytes to take from the buffer.
300	*/
301	static void rtManifestPtIos_UpdateHashes(PRTMANIFESTPTIOS pThis, PCRTSGBUF pSgBuf, size_t cbLeft)
302	{
303	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
304	{
305	size_t cbSeg = pSgBuf->paSegs[iSeg].cbSeg;
306	if (cbSeg > cbLeft)
307	cbSeg = cbLeft;
308	rtManifestHashesUpdate(pThis->pHashes, pSgBuf->paSegs[iSeg].pvSeg, cbSeg);
309	cbLeft -= cbSeg;
310	if (!cbLeft)
311	break;
312	}
313	}
314
315	/**
316	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead}
317	*/
318	static DECLCALLBACK(int) rtManifestPtIos_Read(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbRead)
319	{
320	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
321	int rc;
322
323	/*
324	* To make sure we're continuing where we left off, we must have the exact
325	* stream position since a previous read using 'off' may change it.
326	*/
327	RTFOFF offActual = off == -1 ? RTVfsIoStrmTell(pThis->hVfsIos) : off;
328	if (offActual == pThis->offCurPos)
329	{
330	rc = RTVfsIoStrmSgRead(pThis->hVfsIos, off, pSgBuf, fBlocking, pcbRead);
331	if (RT_SUCCESS(rc))
332	{
333	rtManifestPtIos_UpdateHashes(pThis, pSgBuf, pcbRead ? *pcbRead : ~(size_t)0);
334	if (!pcbRead)
335	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
336	pThis->offCurPos += pSgBuf->paSegs[iSeg].cbSeg;
337	else
338	pThis->offCurPos += *pcbRead;
339	}
340	Assert(RTVfsIoStrmTell(pThis->hVfsIos) == pThis->offCurPos);
341	}
342	else
343	{
344	/*
345	* If we're skipping over stuff, we need to read the gap and hash it.
346	*/
347	if (pThis->offCurPos < offActual)
348	{
349	size_t cbBuf = _8K;
350	void *pvBuf = alloca(cbBuf);
351	do
352	{
353	RTFOFF cbGap = off - pThis->offCurPos;
354	size_t cbThisRead = cbGap >= (RTFOFF)cbBuf ? cbBuf : (size_t)cbGap;
355	size_t cbActual;
356	rc = RTVfsIoStrmReadAt(pThis->hVfsIos, pThis->offCurPos, pvBuf, cbThisRead, fBlocking, &cbActual);
357	if (RT_FAILURE(rc) \|\| rc == VINF_TRY_AGAIN)
358	return rc;
359
360	rtManifestHashesUpdate(pThis->pHashes, pvBuf, cbActual);
361	pThis->offCurPos += cbActual;
362
363	if (rc == VINF_EOF)
364	{
365	if (pcbRead)
366	*pcbRead = 0;
367	else
368	rc = VERR_EOF;
369	return rc;
370	}
371	} while (pThis->offCurPos < offActual);
372	Assert(RTVfsIoStrmTell(pThis->hVfsIos) == offActual);
373	}
374
375	/*
376	* At this point we've eliminated any gap and can execute the requested read.
377	*/
378	rc = RTVfsIoStrmSgRead(pThis->hVfsIos, off, pSgBuf, fBlocking, pcbRead);
379	if (RT_SUCCESS(rc))
380	{
381	/* See if there is anything to update the hash with. */
382	size_t cbLeft = pcbRead ? *pcbRead : ~(size_t)0;
383	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
384	{
385	size_t cbThis = pSgBuf->paSegs[iSeg].cbSeg;
386	if (cbThis > cbLeft)
387	cbThis = cbLeft;
388
389	if ( offActual >= pThis->offCurPos
390	&& pThis->offCurPos < offActual + (ssize_t)cbThis)
391	{
392	size_t offSeg = (size_t)(offActual - pThis->offCurPos);
393	rtManifestHashesUpdate(pThis->pHashes, (uint8_t *)pSgBuf->paSegs[iSeg].pvSeg + offSeg, cbThis - offSeg);
394	pThis->offCurPos += cbThis - offSeg;
395	}
396
397	cbLeft -= cbThis;
398	if (!cbLeft)
399	break;
400	offActual += cbThis;
401	}
402	}
403	}
404	return rc;
405	}
406
407
408	/**
409	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite}
410	*/
411	static DECLCALLBACK(int) rtManifestPtIos_Write(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbWritten)
412	{
413	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
414	Assert(RTVfsIoStrmTell(pThis->hVfsIos) == pThis->offCurPos);
415
416	/*
417	* Validate the offset.
418	*/
419	if (off < 0 \|\| off == pThis->offCurPos)
420	{ /* likely */ }
421	else
422	{
423	/* We cannot go back and rewrite stuff. Sorry. */
424	AssertReturn(off > pThis->offCurPos, VERR_WRONG_ORDER);
425
426	/*
427	* We've got a gap between the current and new position.
428	* Fill it with zeros and hope for the best.
429	*/
430	uint64_t cbZeroGap = off - pThis->offCurPos;
431	do
432	{
433	size_t cbToZero = cbZeroGap >= sizeof(g_abRTZero64K) ? sizeof(g_abRTZero64K) : (size_t)cbZeroGap;
434	size_t cbZeroed = 0;
435	int rc = RTVfsIoStrmWrite(pThis->hVfsIos, g_abRTZero64K, cbToZero, true /fBlocking/, &cbZeroed);
436	if (RT_FAILURE(rc))
437	return rc;
438	pThis->offCurPos += cbZeroed;
439	rtManifestHashesUpdate(pThis->pHashes, g_abRTZero64K, cbZeroed);
440	cbZeroGap -= cbZeroed;
441	} while (cbZeroGap > 0);
442	Assert(off == pThis->offCurPos);
443	}
444
445	/*
446	* Do the writing.
447	*/
448	int rc = RTVfsIoStrmSgWrite(pThis->hVfsIos, -1 /off/, pSgBuf, fBlocking, pcbWritten);
449	if (RT_SUCCESS(rc))
450	{
451	rtManifestPtIos_UpdateHashes(pThis, pSgBuf, pcbWritten ? *pcbWritten : ~(size_t)0);
452	if (!pcbWritten)
453	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
454	pThis->offCurPos += pSgBuf->paSegs[iSeg].cbSeg;
455	else
456	pThis->offCurPos += *pcbWritten;
457	}
458	return rc;
459	}
460
461
462	/**
463	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush}
464	*/
465	static DECLCALLBACK(int) rtManifestPtIos_Flush(void *pvThis)
466	{
467	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
468	return RTVfsIoStrmFlush(pThis->hVfsIos);
469	}
470
471
472	/**
473	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnPollOne}
474	*/
475	static DECLCALLBACK(int) rtManifestPtIos_PollOne(void *pvThis, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
476	uint32_t *pfRetEvents)
477	{
478	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
479	return RTVfsIoStrmPoll(pThis->hVfsIos, fEvents, cMillies, fIntr, pfRetEvents);
480	}
481
482
483	/**
484	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell}
485	*/
486	static DECLCALLBACK(int) rtManifestPtIos_Tell(void *pvThis, PRTFOFF poffActual)
487	{
488	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)pvThis;
489	RTFOFF off = RTVfsIoStrmTell(pThis->hVfsIos);
490	if (off < 0)
491	return (int)off;
492	*poffActual = off;
493	return VINF_SUCCESS;
494	}
495
496
497	/**
498	* The manifest passthru I/O stream vtable.
499	*/
500	static RTVFSIOSTREAMOPS g_rtManifestPassthruIosOps =
501	{
502	{ /* Obj */
503	RTVFSOBJOPS_VERSION,
504	RTVFSOBJTYPE_IO_STREAM,
505	"manifest passthru I/O stream",
506	rtManifestPtIos_Close,
507	rtManifestPtIos_QueryInfo,
508	RTVFSOBJOPS_VERSION
509	},
510	RTVFSIOSTREAMOPS_VERSION,
511	0,
512	rtManifestPtIos_Read,
513	rtManifestPtIos_Write,
514	rtManifestPtIos_Flush,
515	rtManifestPtIos_PollOne,
516	rtManifestPtIos_Tell,
517	NULL /* Skip */,
518	NULL /* ZeroFill */,
519	RTVFSIOSTREAMOPS_VERSION,
520	};
521
522
523
524	/**
525	* Add an entry for an I/O stream using a passthru stream.
526	*
527	* The passthru I/O stream will hash all the data read from or written to the
528	* stream and automatically add an entry to the manifest with the desired
529	* attributes when it is released. Alternatively one can call
530	* RTManifestPtIosAddEntryNow() to have more control over exactly when this
531	* action is performed and which status it yields.
532	*
533	* @returns IPRT status code.
534	* @param hManifest The manifest to add the entry to.
535	* @param hVfsIos The I/O stream to pass thru to/from.
536	* @param pszEntry The entry name.
537	* @param fAttrs The attributes to create for this stream.
538	* @param fReadOrWrite Whether it's a read or write I/O stream.
539	* @param phVfsIosPassthru Where to return the new handle.
540	*/
541	RTDECL(int) RTManifestEntryAddPassthruIoStream(RTMANIFEST hManifest, RTVFSIOSTREAM hVfsIos, const char *pszEntry,
542	uint32_t fAttrs, bool fReadOrWrite, PRTVFSIOSTREAM phVfsIosPassthru)
543	{
544	/*
545	* Validate input.
546	*/
547	AssertReturn(fAttrs < RTMANIFEST_ATTR_END, VERR_INVALID_PARAMETER);
548	AssertPtr(pszEntry);
549	AssertPtr(phVfsIosPassthru);
550
551	RTFOFF const offCurPos = RTVfsIoStrmTell(hVfsIos);
552	AssertReturn(offCurPos >= 0, (int)offCurPos);
553
554	uint32_t cRefs = RTManifestRetain(hManifest);
555	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
556
557	cRefs = RTVfsIoStrmRetain(hVfsIos);
558	AssertReturnStmt(cRefs != UINT32_MAX, RTManifestRelease(hManifest), VERR_INVALID_HANDLE);
559
560	/*
561	* Create an instace of the passthru I/O stream.
562	*/
563	PRTMANIFESTPTIOS pThis;
564	RTVFSIOSTREAM hVfsPtIos;
565	int rc = RTVfsNewIoStream(&g_rtManifestPassthruIosOps, sizeof(*pThis), fReadOrWrite ? RTFILE_O_READ : RTFILE_O_WRITE,
566	NIL_RTVFS, NIL_RTVFSLOCK, &hVfsPtIos, (void **)&pThis);
567	if (RT_SUCCESS(rc))
568	{
569	pThis->hVfsIos = hVfsIos;
570	pThis->pHashes = rtManifestHashesCreate(fAttrs);
571	pThis->offCurPos = offCurPos;
572	pThis->hManifest = hManifest;
573	pThis->fReadOrWrite = fReadOrWrite;
574	pThis->fAddedEntry = false;
575	pThis->pszEntry = RTStrDup(pszEntry);
576	if (pThis->pszEntry && pThis->pHashes)
577	{
578	*phVfsIosPassthru = hVfsPtIos;
579	return VINF_SUCCESS;
580	}
581
582	RTVfsIoStrmRelease(hVfsPtIos);
583	}
584	else
585	{
586	RTVfsIoStrmRelease(hVfsIos);
587	RTManifestRelease(hManifest);
588	}
589	return rc;
590	}
591
592
593	/**
594	* Adds the entry to the manifest right now.
595	*
596	* @returns IPRT status code.
597	* @param hVfsPtIos The manifest passthru I/O stream returned by
598	* RTManifestEntryAddPassthruIoStream().
599	*/
600	RTDECL(int) RTManifestPtIosAddEntryNow(RTVFSIOSTREAM hVfsPtIos)
601	{
602	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)RTVfsIoStreamToPrivate(hVfsPtIos, &g_rtManifestPassthruIosOps);
603	AssertReturn(pThis, VERR_INVALID_HANDLE);
604	AssertReturn(!pThis->fAddedEntry, VERR_WRONG_ORDER);
605
606	pThis->fAddedEntry = true;
607	rtManifestHashesFinal(pThis->pHashes);
608	return rtManifestHashesSetAttrs(pThis->pHashes, pThis->hManifest, pThis->pszEntry);
609	}
610
611
612	/**
613	* Checks if the give I/O stream is a manifest passthru instance or not.
614	*
615	* @returns true if it's a manifest passthru I/O stream, false if not.
616	* @param hVfsPtIos Possible the manifest passthru I/O stream handle.
617	*/
618	RTDECL(bool) RTManifestPtIosIsInstanceOf(RTVFSIOSTREAM hVfsPtIos)
619	{
620	if (hVfsPtIos != NIL_RTVFSIOSTREAM)
621	{
622	PRTMANIFESTPTIOS pThis = (PRTMANIFESTPTIOS)RTVfsIoStreamToPrivate(hVfsPtIos, &g_rtManifestPassthruIosOps);
623	if (pThis)
624	return true;
625	}
626	return false;
627	}
628
629
630	/**
631	* Adds an entry for a file with the specified set of attributes.
632	*
633	* @returns IPRT status code.
634	*
635	* @param hManifest The manifest handle.
636	* @param hVfsIos The I/O stream handle of the entry. This will
637	* be processed to its end on successful return.
638	* (Must be positioned at the start to get
639	* the expected results.)
640	* @param pszEntry The entry name.
641	* @param fAttrs The attributes to create for this stream.
642	*/
643	RTDECL(int) RTManifestEntryAddIoStream(RTMANIFEST hManifest, RTVFSIOSTREAM hVfsIos, const char *pszEntry, uint32_t fAttrs)
644	{
645	/*
646	* Note! This is a convenicence function, so just use the available public
647	* methods to get the job done.
648	*/
649	AssertReturn(fAttrs < RTMANIFEST_ATTR_END, VERR_INVALID_PARAMETER);
650	AssertPtr(pszEntry);
651
652	/*
653	* Allocate and initialize the hash contexts, hash digests and I/O buffer.
654	*/
655	PRTMANIFESTHASHES pHashes = rtManifestHashesCreate(fAttrs);
656	if (!pHashes)
657	return VERR_NO_TMP_MEMORY;
658
659	int rc;
660	size_t cbBuf = _1M;
661	void *pvBuf = RTMemTmpAlloc(cbBuf);
662	if (RT_UNLIKELY(!pvBuf))
663	{
664	cbBuf = _4K;
665	pvBuf = RTMemTmpAlloc(cbBuf);
666	}
667	if (RT_LIKELY(pvBuf))
668	{
669	/*
670	* Process the stream data.
671	*/
672	for (;;)
673	{
674	size_t cbRead;
675	rc = RTVfsIoStrmRead(hVfsIos, pvBuf, cbBuf, true /fBlocking/, &cbRead);
676	if ( (rc == VINF_EOF && cbRead == 0)
677	\|\| RT_FAILURE(rc))
678	break;
679	rtManifestHashesUpdate(pHashes, pvBuf, cbRead);
680	}
681	RTMemTmpFree(pvBuf);
682	if (RT_SUCCESS(rc))
683	{
684	/*
685	* Add the entry with the finalized hashes.
686	*/
687	rtManifestHashesFinal(pHashes);
688	rc = RTManifestEntryAdd(hManifest, pszEntry);
689	if (RT_SUCCESS(rc))
690	rc = rtManifestHashesSetAttrs(pHashes, hManifest, pszEntry);
691	}
692	}
693	else
694	rc = VERR_NO_TMP_MEMORY;
695
696	rtManifestHashesDestroy(pHashes);
697	return rc;
698	}
699

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source: vbox/trunk/src/VBox/Runtime/common/checksum/manifest3.cpp@ 72426

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