tar.cpp@ 81106

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1	/* $Id: tar.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Tar archive I/O.
4	*/
5
6	/*
7	* Copyright (C) 2009-2019 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/tar.h>
33
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/err.h>
37	#include <iprt/file.h>
38	#include <iprt/mem.h>
39	#include <iprt/path.h>
40	#include <iprt/string.h>
41	#include <iprt/vfs.h>
42	#include <iprt/zip.h>
43
44
45	#include "internal/magics.h"
46	#include "tar.h"
47
48
49	/*********************************************************************************************************************************
50	* Structures and Typedefs *
51	*********************************************************************************************************************************/
52	/** @name RTTARRECORD::h::linkflag
53	* @{ */
54	#define LF_OLDNORMAL '\0' /*< Normal disk file, Unix compatible /
55	#define LF_NORMAL '0' /*< Normal disk file /
56	#define LF_LINK '1' /*< Link to previously dumped file /
57	#define LF_SYMLINK '2' /*< Symbolic link /
58	#define LF_CHR '3' /*< Character special file /
59	#define LF_BLK '4' /*< Block special file /
60	#define LF_DIR '5' /*< Directory /
61	#define LF_FIFO '6' /*< FIFO special file /
62	#define LF_CONTIG '7' /*< Contiguous file /
63	/** @} */
64
65	/**
66	* A tar file header.
67	*/
68	typedef union RTTARRECORD
69	{
70	char d[512];
71	struct h
72	{
73	char name[100];
74	char mode[8];
75	char uid[8];
76	char gid[8];
77	char size[12];
78	char mtime[12];
79	char chksum[8];
80	char linkflag;
81	char linkname[100];
82	char magic[8];
83	char uname[32];
84	char gname[32];
85	char devmajor[8];
86	char devminor[8];
87	} h;
88	} RTTARRECORD;
89	AssertCompileSize(RTTARRECORD, 512);
90	AssertCompileMemberOffset(RTTARRECORD, h.size, 100+8*3);
91	AssertCompileMemberSize(RTTARRECORD, h.name, RTTAR_NAME_MAX+1);
92	/** Pointer to a tar file header. */
93	typedef RTTARRECORD *PRTTARRECORD;
94
95	/** Pointer to a tar file handle. */
96	typedef struct RTTARFILEINTERNAL *PRTTARFILEINTERNAL;
97
98	/**
99	* The internal data of a tar handle.
100	*/
101	typedef struct RTTARINTERNAL
102	{
103	/** The magic (RTTAR_MAGIC). */
104	uint32_t u32Magic;
105	/** The handle to the tar file. */
106	RTFILE hTarFile;
107	/** The open mode for hTarFile. */
108	uint32_t fOpenMode;
109	/** Whether a file within the archive is currently open for writing.
110	* Only one can be open. */
111	bool fFileOpenForWrite;
112	/** The tar file VFS handle (for reading). */
113	RTVFSFILE hVfsFile;
114	/** The tar file system VFS handle. */
115	RTVFSFSSTREAM hVfsFss;
116	/** Set if hVfsFss is at the start of the stream and doesn't need rewinding. */
117	bool fFssAtStart;
118	} RTTARINTERNAL;
119	/** Pointer to a the internal data of a tar handle. */
120	typedef RTTARINTERNAL* PRTTARINTERNAL;
121
122	/**
123	* The internal data of a file within a tar file.
124	*/
125	typedef struct RTTARFILEINTERNAL
126	{
127	/** The magic (RTTARFILE_MAGIC). */
128	uint32_t u32Magic;
129	/** The open mode. */
130	uint32_t fOpenMode;
131	/** Pointer to back to the tar file. */
132	PRTTARINTERNAL pTar;
133	/** The name of the file. */
134	char *pszFilename;
135	/** The offset into the archive where the file header starts. */
136	uint64_t offStart;
137	/** The size of the file. */
138	uint64_t cbSize;
139	/** The size set by RTTarFileSetSize(). */
140	uint64_t cbSetSize;
141	/** The current offset within this file. */
142	uint64_t offCurrent;
143	/** The VFS I/O stream (only for reading atm). */
144	RTVFSIOSTREAM hVfsIos;
145	} RTTARFILEINTERNAL;
146	/** Pointer to the internal data of a tar file. */
147	typedef RTTARFILEINTERNAL *PRTTARFILEINTERNAL;
148
149
150
151	/*********************************************************************************************************************************
152	* Defined Constants And Macros *
153	*********************************************************************************************************************************/
154
155	/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */
156	/* RTTAR */
157	#define RTTAR_VALID_RETURN_RC(hHandle, rc) \
158	do { \
159	AssertPtrReturn((hHandle), (rc)); \
160	AssertReturn((hHandle)->u32Magic == RTTAR_MAGIC, (rc)); \
161	} while (0)
162	/* RTTARFILE */
163	#define RTTARFILE_VALID_RETURN_RC(hHandle, rc) \
164	do { \
165	AssertPtrReturn((hHandle), (rc)); \
166	AssertReturn((hHandle)->u32Magic == RTTARFILE_MAGIC, (rc)); \
167	} while (0)
168
169	/** Validates a handle and returns VERR_INVALID_HANDLE if not valid. */
170	/* RTTAR */
171	#define RTTAR_VALID_RETURN(hHandle) RTTAR_VALID_RETURN_RC((hHandle), VERR_INVALID_HANDLE)
172	/* RTTARFILE */
173	#define RTTARFILE_VALID_RETURN(hHandle) RTTARFILE_VALID_RETURN_RC((hHandle), VERR_INVALID_HANDLE)
174
175	/** Validates a handle and returns (void) if not valid. */
176	/* RTTAR */
177	#define RTTAR_VALID_RETURN_VOID(hHandle) \
178	do { \
179	AssertPtrReturnVoid(hHandle); \
180	AssertReturnVoid((hHandle)->u32Magic == RTTAR_MAGIC); \
181	} while (0)
182	/* RTTARFILE */
183	#define RTTARFILE_VALID_RETURN_VOID(hHandle) \
184	do { \
185	AssertPtrReturnVoid(hHandle); \
186	AssertReturnVoid((hHandle)->u32Magic == RTTARFILE_MAGIC); \
187	} while (0)
188
189
190	RTR3DECL(int) RTTarOpen(PRTTAR phTar, const char *pszTarname, uint32_t fMode)
191	{
192	AssertReturn(fMode & RTFILE_O_WRITE, VERR_INVALID_PARAMETER);
193
194	/*
195	* Create a tar instance.
196	*/
197	PRTTARINTERNAL pThis = (PRTTARINTERNAL)RTMemAllocZ(sizeof(RTTARINTERNAL));
198	if (!pThis)
199	return VERR_NO_MEMORY;
200
201	pThis->u32Magic = RTTAR_MAGIC;
202	pThis->fOpenMode = fMode;
203	pThis->hVfsFile = NIL_RTVFSFILE;
204	pThis->hVfsFss = NIL_RTVFSFSSTREAM;
205	pThis->fFssAtStart = false;
206
207	/*
208	* Open the tar file.
209	*/
210	int rc = RTFileOpen(&pThis->hTarFile, pszTarname, fMode);
211	if (RT_SUCCESS(rc))
212	{
213	*phTar = pThis;
214	return VINF_SUCCESS;
215	}
216
217	RTMemFree(pThis);
218	return rc;
219	}
220
221
222	RTR3DECL(int) RTTarClose(RTTAR hTar)
223	{
224	if (hTar == NIL_RTTAR)
225	return VINF_SUCCESS;
226
227	PRTTARINTERNAL pInt = hTar;
228	RTTAR_VALID_RETURN(pInt);
229
230	int rc = VINF_SUCCESS;
231
232	/* gtar gives a warning, but the documentation says EOF is indicated by a
233	* zero block. Disabled for now. */
234	#if 0
235	{
236	/* Append the EOF record which is filled all by zeros */
237	RTTARRECORD record;
238	RT_ZERO(record);
239	rc = RTFileWrite(pInt->hTarFile, &record, sizeof(record), NULL);
240	}
241	#endif
242
243	if (pInt->hVfsFss != NIL_RTVFSFSSTREAM)
244	{
245	uint32_t cRefs = RTVfsFsStrmRelease(pInt->hVfsFss); Assert(cRefs != UINT32_MAX); NOREF(cRefs);
246	pInt->hVfsFss = NIL_RTVFSFSSTREAM;
247	}
248
249	if (pInt->hVfsFile != NIL_RTVFSFILE)
250	{
251	uint32_t cRefs = RTVfsFileRelease(pInt->hVfsFile); Assert(cRefs != UINT32_MAX); NOREF(cRefs);
252	pInt->hVfsFile = NIL_RTVFSFILE;
253	}
254
255	if (pInt->hTarFile != NIL_RTFILE)
256	{
257	rc = RTFileClose(pInt->hTarFile);
258	pInt->hTarFile = NIL_RTFILE;
259	}
260
261	pInt->u32Magic = RTTAR_MAGIC_DEAD;
262
263	RTMemFree(pInt);
264
265	return rc;
266	}
267
268
269	/**
270	* Creates a tar file handle for a read-only VFS stream object.
271	*
272	* @returns IPRT status code.
273	* @param pszName The file name. Automatically freed on failure.
274	* @param hVfsIos The VFS I/O stream we create the handle around.
275	* The reference is NOT consumed.
276	* @param fOpen The open flags.
277	* @param ppFile Where to return the handle.
278	*/
279	static int rtTarFileCreateHandleForReadOnly(char pszName, RTVFSIOSTREAM hVfsIos, uint32_t fOpen, PRTTARFILEINTERNAL ppFile)
280	{
281	int rc;
282	PRTTARFILEINTERNAL pNewFile = (PRTTARFILEINTERNAL)RTMemAllocZ(sizeof(*pNewFile));
283	if (pNewFile)
284	{
285	RTFSOBJINFO ObjInfo;
286	rc = RTVfsIoStrmQueryInfo(hVfsIos, &ObjInfo, RTFSOBJATTRADD_UNIX);
287	if (RT_SUCCESS(rc))
288	{
289	pNewFile->u32Magic = RTTARFILE_MAGIC;
290	pNewFile->pTar = NULL;
291	pNewFile->pszFilename = pszName;
292	pNewFile->offStart = UINT64_MAX;
293	pNewFile->cbSize = ObjInfo.cbObject;
294	pNewFile->cbSetSize = 0;
295	pNewFile->offCurrent = 0;
296	pNewFile->fOpenMode = fOpen;
297	pNewFile->hVfsIos = hVfsIos;
298
299	uint32_t cRefs = RTVfsIoStrmRetain(hVfsIos); Assert(cRefs != UINT32_MAX); NOREF(cRefs);
300
301	*ppFile = pNewFile;
302	return VINF_SUCCESS;
303	}
304
305	RTMemFree(pNewFile);
306	}
307	else
308	rc = VERR_NO_MEMORY;
309	RTStrFree(pszName);
310	return rc;
311	}
312
313
314	/* Only used for write handles. */
315	static PRTTARFILEINTERNAL rtTarFileCreateForWrite(PRTTARINTERNAL pInt, const char *pszFilename, uint32_t fOpen)
316	{
317	PRTTARFILEINTERNAL pFileInt = (PRTTARFILEINTERNAL)RTMemAllocZ(sizeof(RTTARFILEINTERNAL));
318	if (!pFileInt)
319	return NULL;
320
321	pFileInt->u32Magic = RTTARFILE_MAGIC;
322	pFileInt->pTar = pInt;
323	pFileInt->fOpenMode = fOpen;
324	pFileInt->pszFilename = RTStrDup(pszFilename);
325	pFileInt->hVfsIos = NIL_RTVFSIOSTREAM;
326	if (pFileInt->pszFilename)
327	return pFileInt;
328
329	RTMemFree(pFileInt);
330	return NULL;
331
332	}
333
334
335	RTR3DECL(int) RTTarFileOpen(RTTAR hTar, PRTTARFILE phFile, const char *pszFilename, uint32_t fOpen)
336	{
337	/* Write only interface now. */
338	AssertReturn(fOpen & RTFILE_O_WRITE, VERR_INVALID_PARAMETER);
339
340	PRTTARINTERNAL pInt = hTar;
341	RTTAR_VALID_RETURN(pInt);
342
343	if (!pInt->hTarFile)
344	return VERR_INVALID_HANDLE;
345
346	if (fOpen & RTFILE_O_WRITE)
347	{
348	if (!(pInt->fOpenMode & RTFILE_O_WRITE))
349	return VERR_WRITE_PROTECT;
350	if (pInt->fFileOpenForWrite)
351	return VERR_TOO_MANY_OPEN_FILES;
352	}
353
354	int rc = VINF_SUCCESS;
355	if (!(fOpen & RTFILE_O_WRITE))
356	{
357	/*
358	* Rewind the stream if necessary.
359	*/
360	if (!pInt->fFssAtStart)
361	{
362	if (pInt->hVfsFss != NIL_RTVFSFSSTREAM)
363	{
364	uint32_t cRefs = RTVfsFsStrmRelease(pInt->hVfsFss); Assert(cRefs != UINT32_MAX); NOREF(cRefs);
365	pInt->hVfsFss = NIL_RTVFSFSSTREAM;
366	}
367
368	if (pInt->hVfsFile == NIL_RTVFSFILE)
369	{
370	rc = RTVfsFileFromRTFile(pInt->hTarFile, RTFILE_O_READ, true /fLeaveOpen/, &pInt->hVfsFile);
371	if (RT_FAILURE(rc))
372	return rc;
373	}
374
375	RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(pInt->hVfsFile);
376	rc = RTZipTarFsStreamFromIoStream(hVfsIos, 0 /fFlags/, &pInt->hVfsFss);
377	RTVfsIoStrmRelease(hVfsIos);
378	if (RT_FAILURE(rc))
379	return rc;
380	}
381
382	/*
383	* Search the file system stream.
384	*/
385	pInt->fFssAtStart = false;
386	for (;;)
387	{
388	char *pszName;
389	RTVFSOBJTYPE enmType;
390	RTVFSOBJ hVfsObj;
391	rc = RTVfsFsStrmNext(pInt->hVfsFss, &pszName, &enmType, &hVfsObj);
392	if (rc == VERR_EOF)
393	return VERR_FILE_NOT_FOUND;
394	if (RT_FAILURE(rc))
395	return rc;
396
397	if (!RTStrCmp(pszName, pszFilename))
398	{
399	if (enmType == RTVFSOBJTYPE_FILE \|\| enmType == RTVFSOBJTYPE_IO_STREAM)
400	rc = rtTarFileCreateHandleForReadOnly(pszName, RTVfsObjToIoStream(hVfsObj), fOpen, phFile);
401	else
402	{
403	rc = VERR_UNEXPECTED_FS_OBJ_TYPE;
404	RTStrFree(pszName);
405	}
406	RTVfsObjRelease(hVfsObj);
407	break;
408	}
409	RTStrFree(pszName);
410	RTVfsObjRelease(hVfsObj);
411	} /* Search loop. */
412	}
413	else
414	{
415	PRTTARFILEINTERNAL pFileInt = rtTarFileCreateForWrite(pInt, pszFilename, fOpen);
416	if (!pFileInt)
417	return VERR_NO_MEMORY;
418
419	pInt->fFileOpenForWrite = true;
420
421	/* If we are in write mode, we also in append mode. Add an dummy
422	* header at the end of the current file. It will be filled by the
423	* close operation. */
424	rc = RTFileSeek(pFileInt->pTar->hTarFile, 0, RTFILE_SEEK_END, &pFileInt->offStart);
425	if (RT_SUCCESS(rc))
426	{
427	RTTARRECORD record;
428	RT_ZERO(record);
429	rc = RTFileWrite(pFileInt->pTar->hTarFile, &record, sizeof(RTTARRECORD), NULL);
430	}
431
432	if (RT_SUCCESS(rc))
433	*phFile = (RTTARFILE)pFileInt;
434	else
435	{
436	/* Cleanup on failure */
437	if (pFileInt->pszFilename)
438	RTStrFree(pFileInt->pszFilename);
439	RTMemFree(pFileInt);
440	}
441	}
442
443	return rc;
444	}
445
446
447	static void rtTarSizeToRec(PRTTARRECORD pRecord, uint64_t cbSize)
448	{
449	/*
450	* Small enough for the standard octal string encoding?
451	*
452	* Note! We could actually use the terminator character as well if we liked,
453	* but let not do that as it's easier to test this way.
454	*/
455	if (cbSize < _4G * 2U)
456	RTStrPrintf(pRecord->h.size, sizeof(pRecord->h.size), "%0.11llo", cbSize);
457	else
458	{
459	/*
460	* Base 256 extension. Set the highest bit of the left most character.
461	* We don't deal with negatives here, cause the size have to be greater
462	* than zero.
463	*
464	* Note! The base-256 extension are never used by gtar or libarchive
465	* with the "ustar \0" format version, only the later
466	* "ustar\000" version. However, this shouldn't cause much
467	* trouble as they are not picky about what they read.
468	*/
469	size_t cchField = sizeof(pRecord->h.size) - 1;
470	unsigned char puchField = (unsigned char)pRecord->h.size;
471	puchField[0] = 0x80;
472	do
473	{
474	puchField[cchField--] = cbSize & 0xff;
475	cbSize >>= 8;
476	} while (cchField);
477	}
478	}
479
480
481	static int rtTarCreateHeaderRecord(PRTTARRECORD pRecord, const char *pszSrcName, uint64_t cbSize,
482	RTUID uid, RTGID gid, RTFMODE fmode, int64_t mtime)
483	{
484	/** @todo check for field overflows. */
485	/* Fill the header record */
486	// RT_ZERO(pRecord); - done by the caller.
487	/** @todo use RTStrCopy */
488	size_t cb = RTStrPrintf(pRecord->h.name, sizeof(pRecord->h.name), "%s", pszSrcName);
489	if (cb < strlen(pszSrcName))
490	return VERR_BUFFER_OVERFLOW;
491	RTStrPrintf(pRecord->h.mode, sizeof(pRecord->h.mode), "%0.7o", fmode);
492	RTStrPrintf(pRecord->h.uid, sizeof(pRecord->h.uid), "%0.7o", uid);
493	RTStrPrintf(pRecord->h.gid, sizeof(pRecord->h.gid), "%0.7o", gid);
494	rtTarSizeToRec(pRecord, cbSize);
495	RTStrPrintf(pRecord->h.mtime, sizeof(pRecord->h.mtime), "%0.11llo", mtime);
496	RTStrPrintf(pRecord->h.magic, sizeof(pRecord->h.magic), "ustar ");
497	RTStrPrintf(pRecord->h.uname, sizeof(pRecord->h.uname), "someone");
498	RTStrPrintf(pRecord->h.gname, sizeof(pRecord->h.gname), "someone");
499	pRecord->h.linkflag = LF_NORMAL;
500
501	/* Create the checksum out of the new header */
502	int32_t iUnsignedChksum, iSignedChksum;
503	if (rtZipTarCalcChkSum((PCRTZIPTARHDR)pRecord, &iUnsignedChksum, &iSignedChksum))
504	return VERR_TAR_END_OF_FILE;
505
506	/* Format the checksum */
507	RTStrPrintf(pRecord->h.chksum, sizeof(pRecord->h.chksum), "%0.7o", iUnsignedChksum);
508
509	return VINF_SUCCESS;
510	}
511
512
513	DECLINLINE(void ) rtTarMemTmpAlloc(size_t pcbSize)
514	{
515	*pcbSize = 0;
516	/* Allocate a reasonably large buffer, fall back on a tiny one.
517	* Note: has to be 512 byte aligned and >= 512 byte. */
518	size_t cbTmp = _1M;
519	void *pvTmp = RTMemTmpAlloc(cbTmp);
520	if (!pvTmp)
521	{
522	cbTmp = sizeof(RTTARRECORD);
523	pvTmp = RTMemTmpAlloc(cbTmp);
524	}
525	*pcbSize = cbTmp;
526	return pvTmp;
527	}
528
529
530	static int rtTarAppendZeros(PRTTARFILEINTERNAL pFileInt, uint64_t cbSize)
531	{
532	/* Allocate a temporary buffer for copying the tar content in blocks. */
533	size_t cbTmp = 0;
534	void *pvTmp = rtTarMemTmpAlloc(&cbTmp);
535	if (!pvTmp)
536	return VERR_NO_MEMORY;
537	RT_BZERO(pvTmp, cbTmp);
538
539	int rc = VINF_SUCCESS;
540	uint64_t cbAllWritten = 0;
541	size_t cbWritten = 0;
542	for (;;)
543	{
544	if (cbAllWritten >= cbSize)
545	break;
546	size_t cbToWrite = RT_MIN(cbSize - cbAllWritten, cbTmp);
547	rc = RTTarFileWriteAt(pFileInt, pFileInt->offCurrent, pvTmp, cbToWrite, &cbWritten);
548	if (RT_FAILURE(rc))
549	break;
550	cbAllWritten += cbWritten;
551	}
552
553	RTMemTmpFree(pvTmp);
554
555	return rc;
556	}
557
558
559	RTR3DECL(int) RTTarFileClose(RTTARFILE hFile)
560	{
561	/* Already closed? */
562	if (hFile == NIL_RTTARFILE)
563	return VINF_SUCCESS;
564
565	PRTTARFILEINTERNAL pFileInt = hFile;
566	RTTARFILE_VALID_RETURN(pFileInt);
567
568	int rc = VINF_SUCCESS;
569
570	/* In write mode: */
571	if ((pFileInt->fOpenMode & (RTFILE_O_WRITE \| RTFILE_O_READ)) == RTFILE_O_WRITE)
572	{
573	pFileInt->pTar->fFileOpenForWrite = false;
574	do
575	{
576	/* If the user has called RTTarFileSetSize in the meantime, we have
577	to make sure the file has the right size. */
578	if (pFileInt->cbSetSize > pFileInt->cbSize)
579	{
580	rc = rtTarAppendZeros(pFileInt, pFileInt->cbSetSize - pFileInt->cbSize);
581	if (RT_FAILURE(rc))
582	break;
583	}
584
585	/* If the written size isn't 512 byte aligned, we need to fix this. */
586	RTTARRECORD record;
587	RT_ZERO(record);
588	uint64_t cbSizeAligned = RT_ALIGN(pFileInt->cbSize, sizeof(RTTARRECORD));
589	if (cbSizeAligned != pFileInt->cbSize)
590	{
591	/* Note the RTFile method. We didn't increase the cbSize or cbCurrentPos here. */
592	rc = RTFileWriteAt(pFileInt->pTar->hTarFile,
593	pFileInt->offStart + sizeof(RTTARRECORD) + pFileInt->cbSize,
594	&record,
595	cbSizeAligned - pFileInt->cbSize,
596	NULL);
597	if (RT_FAILURE(rc))
598	break;
599	}
600
601	/* Create a header record for the file */
602	/** @todo mode, gid, uid, mtime should be setable (or detected myself) */
603	RTTIMESPEC time;
604	RTTimeNow(&time);
605	rc = rtTarCreateHeaderRecord(&record, pFileInt->pszFilename, pFileInt->cbSize,
606	0, 0, 0600, RTTimeSpecGetSeconds(&time));
607	if (RT_FAILURE(rc))
608	break;
609
610	/* Write this at the start of the file data */
611	rc = RTFileWriteAt(pFileInt->pTar->hTarFile, pFileInt->offStart, &record, sizeof(RTTARRECORD), NULL);
612	if (RT_FAILURE(rc))
613	break;
614	}
615	while (0);
616	}
617
618	/*
619	* Now cleanup and delete the handle.
620	*/
621	if (pFileInt->pszFilename)
622	RTStrFree(pFileInt->pszFilename);
623	if (pFileInt->hVfsIos != NIL_RTVFSIOSTREAM)
624	{
625	RTVfsIoStrmRelease(pFileInt->hVfsIos);
626	pFileInt->hVfsIos = NIL_RTVFSIOSTREAM;
627	}
628	pFileInt->u32Magic = RTTARFILE_MAGIC_DEAD;
629	RTMemFree(pFileInt);
630
631	return rc;
632	}
633
634
635	RTR3DECL(int) RTTarFileReadAt(RTTARFILE hFile, uint64_t off, void pvBuf, size_t cbToRead, size_t pcbRead)
636	{
637	PRTTARFILEINTERNAL pFileInt = hFile;
638	RTTARFILE_VALID_RETURN(pFileInt);
639
640	size_t cbTmpRead = 0;
641	int rc = RTVfsIoStrmReadAt(pFileInt->hVfsIos, off, pvBuf, cbToRead, true /fBlocking/, &cbTmpRead);
642	if (RT_SUCCESS(rc))
643	{
644	pFileInt->offCurrent = off + cbTmpRead;
645	if (pcbRead)
646	*pcbRead = cbTmpRead;
647	if (rc == VINF_EOF)
648	rc = pcbRead ? VINF_SUCCESS : VERR_EOF;
649	}
650	else if (pcbRead)
651	*pcbRead = 0;
652	return rc;
653	}
654
655
656	RTR3DECL(int) RTTarFileWriteAt(RTTARFILE hFile, uint64_t off, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
657	{
658	PRTTARFILEINTERNAL pFileInt = hFile;
659	RTTARFILE_VALID_RETURN(pFileInt);
660
661	if ((pFileInt->fOpenMode & RTFILE_O_WRITE) != RTFILE_O_WRITE)
662	return VERR_ACCESS_DENIED;
663
664	size_t cbTmpWritten = 0;
665	int rc = RTFileWriteAt(pFileInt->pTar->hTarFile, pFileInt->offStart + 512 + off, pvBuf, cbToWrite, &cbTmpWritten);
666	pFileInt->cbSize += cbTmpWritten;
667	pFileInt->offCurrent = off + cbTmpWritten;
668	if (pcbWritten)
669	*pcbWritten = cbTmpWritten;
670
671	return rc;
672	}
673
674
675	RTR3DECL(int) RTTarFileGetSize(RTTARFILE hFile, uint64_t *pcbSize)
676	{
677	/* Validate input */
678	AssertPtrReturn(pcbSize, VERR_INVALID_POINTER);
679
680	PRTTARFILEINTERNAL pFileInt = hFile;
681	RTTARFILE_VALID_RETURN(pFileInt);
682
683	*pcbSize = RT_MAX(pFileInt->cbSetSize, pFileInt->cbSize);
684
685	return VINF_SUCCESS;
686	}
687
688
689	RTR3DECL(int) RTTarFileSetSize(RTTARFILE hFile, uint64_t cbSize)
690	{
691	PRTTARFILEINTERNAL pFileInt = hFile;
692	RTTARFILE_VALID_RETURN(pFileInt);
693
694	if ((pFileInt->fOpenMode & RTFILE_O_WRITE) != RTFILE_O_WRITE)
695	return VERR_WRITE_ERROR;
696
697	/** @todo If cbSize is smaller than pFileInt->cbSize we have to
698	* truncate the current file. */
699	pFileInt->cbSetSize = cbSize;
700
701	return VINF_SUCCESS;
702	}
703

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source: vbox/trunk/src/VBox/Runtime/common/zip/tar.cpp@ 81106

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