fileio.cpp@ 8170

Last change on this file since 8170 was 8170, checked in by vboxsync, 17 years ago
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1	/* $Id: fileio.cpp 8170 2008-04-18 17:52:25Z vboxsync $ */
2	/** @file
3	* Incredibly Portable Runtime - File I/O.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31	/*******************************************************************************
32	* Header Files *
33	*******************************************************************************/
34	#include <iprt/file.h>
35	#include <iprt/alloc.h>
36	#include <iprt/assert.h>
37	#include <iprt/alloca.h>
38	#include <iprt/err.h>
39	#include "internal/file.h"
40
41
42	/*******************************************************************************
43	* Global Variables *
44	*******************************************************************************/
45	/** Set of forced set open flags for files opened read-only. */
46	static unsigned g_fOpenReadSet = 0;
47
48	/** Set of forced cleared open flags for files opened read-only. */
49	static unsigned g_fOpenReadMask = 0;
50
51	/** Set of forced set open flags for files opened write-only. */
52	static unsigned g_fOpenWriteSet = 0;
53
54	/** Set of forced cleared open flags for files opened write-only. */
55	static unsigned g_fOpenWriteMask = 0;
56
57	/** Set of forced set open flags for files opened read-write. */
58	static unsigned g_fOpenReadWriteSet = 0;
59
60	/** Set of forced cleared open flags for files opened read-write. */
61	static unsigned g_fOpenReadWriteMask = 0;
62
63
64	/**
65	* Force the use of open flags for all files opened after the setting is
66	* changed. The caller is responsible for not causing races with RTFileOpen().
67	*
68	* @returns iprt status code.
69	* @param fOpenForAccess Access mode to which the set/mask settings apply.
70	* @param fSet Open flags to be forced set.
71	* @param fMask Open flags to be masked out.
72	*/
73	RTR3DECL(int) RTFileSetForceFlags(unsigned fOpenForAccess, unsigned fSet, unsigned fMask)
74	{
75	/*
76	* For now allow only RTFILE_O_WRITE_THROUGH. The other flags either
77	* make no sense in this context or are not useful to apply to all files.
78	*/
79	if ((fSet \| fMask) & ~RTFILE_O_WRITE_THROUGH)
80	return VERR_INVALID_PARAMETER;
81	switch (fOpenForAccess)
82	{
83	case RTFILE_O_READ:
84	g_fOpenReadSet = fSet;
85	g_fOpenReadMask = fMask;
86	break;
87	case RTFILE_O_WRITE:
88	g_fOpenWriteSet = fSet;
89	g_fOpenWriteMask = fMask;
90	break;
91	case RTFILE_O_READWRITE:
92	g_fOpenReadWriteSet = fSet;
93	g_fOpenReadWriteMask = fMask;
94	break;
95	default:
96	AssertMsgFailed(("Invalid access mode %d\n", fOpenForAccess));
97	return VERR_INVALID_PARAMETER;
98	}
99	return VINF_SUCCESS;
100	}
101
102
103	/**
104	* Adjusts and validates the flags.
105	*
106	* The adjustments are made according to the wishes specified using the RTFileSetForceFlags API.
107	*
108	* @returns IPRT status code.
109	* @param pfOpen Pointer to the user specified flags on input.
110	* Updated on successful return.
111	* @internal
112	*/
113	int rtFileRecalcAndValidateFlags(unsigned *pfOpen)
114	{
115	/*
116	* Recalc.
117	*/
118	unsigned fOpen = *pfOpen;
119	switch (fOpen & RTFILE_O_ACCESS_MASK)
120	{
121	case RTFILE_O_READ:
122	fOpen \|= g_fOpenReadSet;
123	fOpen &= ~g_fOpenReadMask;
124	break;
125	case RTFILE_O_WRITE:
126	fOpen \|= g_fOpenWriteSet;
127	fOpen &= ~g_fOpenWriteMask;
128	break;
129	case RTFILE_O_READWRITE:
130	fOpen \|= g_fOpenReadWriteSet;
131	fOpen &= ~g_fOpenReadWriteMask;
132	break;
133	default:
134	AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#x\n", fOpen));
135	return VERR_INVALID_PARAMETER;
136	}
137
138	/*
139	* Validate .
140	*/
141	if ( !(fOpen & RTFILE_O_ACCESS_MASK)
142	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
143	\|\| (fOpen & (~RTFILE_O_VALID_MASK \| RTFILE_O_NON_BLOCK))
144	#else
145	\|\| (fOpen & ~RTFILE_O_VALID_MASK)
146	#endif
147	\|\| (fOpen & (RTFILE_O_TRUNCATE \| RTFILE_O_WRITE)) == RTFILE_O_TRUNCATE
148	\|\| ( fOpen & RTFILE_O_NOT_CONTENT_INDEXED
149	&& !( (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE
150	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE
151	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE_REPLACE))
152	)
153	{
154	AssertMsgFailed(("Invalid parameters! fOpen=%#x\n", fOpen));
155	return VERR_INVALID_PARAMETER;
156	}
157
158	/* done */
159	*pfOpen = fOpen;
160	return VINF_SUCCESS;
161	}
162
163
164
165	/**
166	* Read bytes from a file at a given offset.
167	* This function may modify the file position.
168	*
169	* @returns iprt status code.
170	* @param File Handle to the file.
171	* @param off Where to read.
172	* @param pvBuf Where to put the bytes we read.
173	* @param cbToRead How much to read.
174	* @param *pcbRead How much we actually read.
175	* If NULL an error will be returned for a partial read.
176	*/
177	RTR3DECL(int) RTFileReadAt(RTFILE File, RTFOFF off, void pvBuf, size_t cbToRead, size_t pcbRead)
178	{
179	int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
180	if (RT_SUCCESS(rc))
181	rc = RTFileRead(File, pvBuf, cbToRead, pcbRead);
182	return rc;
183	}
184
185
186	/**
187	* Write bytes to a file at a given offset.
188	* This function may modify the file position.
189	*
190	* @returns iprt status code.
191	* @param File Handle to the file.
192	* @param off Where to write.
193	* @param pvBuf What to write.
194	* @param cbToWrite How much to write.
195	* @param *pcbWritten How much we actually wrote.
196	* If NULL an error will be returned for a partial write.
197	*/
198	RTR3DECL(int) RTFileWriteAt(RTFILE File, RTFOFF off, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
199	{
200	int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
201	if (RT_SUCCESS(rc))
202	rc = RTFileWrite(File, pvBuf, cbToWrite, pcbWritten);
203	return rc;
204	}
205
206
207	/**
208	* Gets the current file position.
209	*
210	* @returns File offset.
211	* @returns ~0UUL on failure.
212	* @param File File handle.
213	*/
214	RTR3DECL(uint64_t) RTFileTell(RTFILE File)
215	{
216	/*
217	* Call the seek api to query the stuff.
218	*/
219	uint64_t off = 0;
220	int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &off);
221	if (RT_SUCCESS(rc))
222	return off;
223	AssertMsgFailed(("RTFileSeek(%d) -> %d\n", File, rc));
224	return ~0ULL;
225	}
226
227
228	/**
229	* Determine the maximum file size.
230	*
231	* @returns The max size of the file.
232	* -1 on failure, the file position is undefined.
233	* @param File Handle to the file.
234	* @see RTFileGetMaxSizeEx.
235	*/
236	RTR3DECL(RTFOFF) RTFileGetMaxSize(RTFILE File)
237	{
238	RTFOFF cbMax;
239	int rc = RTFileGetMaxSizeEx(File, &cbMax);
240	return RT_SUCCESS(rc) ? cbMax : -1;
241	}
242
243
244	/**
245	* Determine the maximum file size.
246	*
247	* @returns IPRT status code.
248	* @param File Handle to the file.
249	* @param pcbMax Where to store the max file size.
250	* @see RTFileGetMaxSize.
251	*/
252	RTR3DECL(int) RTFileGetMaxSizeEx(RTFILE File, PRTFOFF pcbMax)
253	{
254	/*
255	* Save the current location
256	*/
257	uint64_t offOld;
258	int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &offOld);
259	if (RT_FAILURE(rc))
260	return rc;
261
262	/*
263	* Perform a binary search for the max file size.
264	*/
265	uint64_t offLow = 0;
266	uint64_t offHigh = 8 * _1T; /* we don't need bigger files */
267	/** @todo r=bird: This isn't doing the trick for windows (at least not vista).
268	* Close to offHigh is returned regardless of NTFS or FAT32.
269	* We might have to make this code OS specific...
270	* In the worse case, we'll have to try GetVolumeInformationByHandle on vista and fall
271	* back on NtQueryVolumeInformationFile(,,,, FileFsAttributeInformation) else where, and
272	* check for known file system names. (For LAN shares we'll have to figure out the remote
273	* file system.) */
274	//uint64_t offHigh = INT64_MAX;
275	for (;;)
276	{
277	uint64_t cbInterval = (offHigh - offLow) >> 1;
278	if (cbInterval == 0)
279	{
280	if (pcbMax)
281	*pcbMax = offLow;
282	return RTFileSeek(File, offOld, RTFILE_SEEK_BEGIN, NULL);
283	}
284
285	rc = RTFileSeek(File, offLow + cbInterval, RTFILE_SEEK_BEGIN, NULL);
286	if (RT_FAILURE(rc))
287	offHigh = offLow + cbInterval;
288	else
289	offLow = offLow + cbInterval;
290	}
291	}
292
293
294	/**
295	* Copies a file given the handles to both files.
296	*
297	* @returns VBox Status code.
298	*
299	* @param FileSrc The source file. The file position is unaltered.
300	* @param FileDst The destination file.
301	* On successful returns the file position is at the end of the file.
302	* On failures the file position and size is undefined.
303	*/
304	RTDECL(int) RTFileCopyByHandles(RTFILE FileSrc, RTFILE FileDst)
305	{
306	return RTFileCopyByHandlesEx(FileSrc, FileDst, NULL, NULL);
307	}
308
309
310	/**
311	* Copies a file.
312	*
313	* @returns VERR_ALREADY_EXISTS if the destination file exists.
314	* @returns VBox Status code.
315	*
316	* @param pszSrc The path to the source file.
317	* @param pszDst The path to the destination file.
318	* This file will be created.
319	* @param fFlags Flags, any of the RTFILECOPY_FLAGS_ \#defines.
320	* @param pfnProgress Pointer to callback function for reporting progress.
321	* @param pvUser User argument to pass to pfnProgress along with the completion precentage.
322	*/
323	RTDECL(int) RTFileCopyEx(const char pszSrc, const char pszDst, uint32_t fFlags, PFNRTPROGRESS pfnProgress, void *pvUser)
324	{
325	/*
326	* Validate input.
327	*/
328	AssertMsgReturn(VALID_PTR(pszSrc), ("pszSrc=%p\n", pszSrc), VERR_INVALID_PARAMETER);
329	AssertMsgReturn(*pszSrc, ("pszSrc=%p\n", pszSrc), VERR_INVALID_PARAMETER);
330	AssertMsgReturn(VALID_PTR(pszDst), ("pszDst=%p\n", pszDst), VERR_INVALID_PARAMETER);
331	AssertMsgReturn(*pszDst, ("pszDst=%p\n", pszDst), VERR_INVALID_PARAMETER);
332	AssertMsgReturn(!pfnProgress \|\| VALID_PTR(pfnProgress), ("pfnProgress=%p\n", pfnProgress), VERR_INVALID_PARAMETER);
333	AssertMsgReturn(!(fFlags & ~RTFILECOPY_FLAGS_MASK), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
334
335	/*
336	* Open the files.
337	*/
338	RTFILE FileSrc;
339	int rc = RTFileOpen(&FileSrc, pszSrc,
340	RTFILE_O_READ \| (fFlags & RTFILECOPY_FLAGS_NO_SRC_DENY_WRITE ? 0 : RTFILE_O_DENY_WRITE) \| RTFILE_O_OPEN);
341	if (RT_SUCCESS(rc))
342	{
343	RTFILE FileDst;
344	rc = RTFileOpen(&FileDst, pszDst,
345	RTFILE_O_WRITE \| (fFlags & RTFILECOPY_FLAGS_NO_DST_DENY_WRITE ? 0 : RTFILE_O_DENY_WRITE) \| RTFILE_O_CREATE);
346	if (RT_SUCCESS(rc))
347	{
348	/*
349	* Call the ByHandles version and let it do the job.
350	*/
351	rc = RTFileCopyByHandlesEx(FileSrc, FileDst, pfnProgress, pvUser);
352
353	/*
354	* Close the files regardless of the result.
355	* Don't bother cleaning up or anything like that.
356	*/
357	int rc2 = RTFileClose(FileDst);
358	AssertRC(rc2);
359	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
360	rc = rc2;
361	}
362
363	int rc2 = RTFileClose(FileSrc);
364	AssertRC(rc2);
365	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
366	rc = rc2;
367	}
368	return rc;
369	}
370
371
372	/**
373	* Copies a file given the handles to both files and
374	* provide progress callbacks.
375	*
376	* @returns VBox Status code.
377	*
378	* @param FileSrc The source file. The file position is unaltered.
379	* @param FileDst The destination file.
380	* On successful returns the file position is at the end of the file.
381	* On failures the file position and size is undefined.
382	* @param pfnProgress Pointer to callback function for reporting progress.
383	* @param pvUser User argument to pass to pfnProgress along with the completion precentage.
384	*/
385	RTDECL(int) RTFileCopyByHandlesEx(RTFILE FileSrc, RTFILE FileDst, PFNRTPROGRESS pfnProgress, void *pvUser)
386	{
387	/*
388	* Validate input.
389	*/
390	AssertMsgReturn(RTFileIsValid(FileSrc), ("FileSrc=%RTfile\n", FileSrc), VERR_INVALID_PARAMETER);
391	AssertMsgReturn(RTFileIsValid(FileDst), ("FileDst=%RTfile\n", FileDst), VERR_INVALID_PARAMETER);
392	AssertMsgReturn(!pfnProgress \|\| VALID_PTR(pfnProgress), ("pfnProgress=%p\n", pfnProgress), VERR_INVALID_PARAMETER);
393
394	/*
395	* Save file offset.
396	*/
397	RTFOFF offSrcSaved;
398	int rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offSrcSaved);
399	if (RT_FAILURE(rc))
400	return rc;
401
402	/*
403	* Get the file size.
404	*/
405	RTFOFF cbSrc;
406	rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_END, (uint64_t *)&cbSrc);
407	if (RT_FAILURE(rc))
408	return rc;
409
410	/*
411	* Allocate buffer.
412	*/
413	size_t cbBuf;
414	uint8_t *pbBufFree = NULL;
415	uint8_t *pbBuf;
416	if (cbSrc < _512K)
417	{
418	cbBuf = 8*_1K;
419	pbBuf = (uint8_t *)alloca(cbBuf);
420	}
421	else
422	{
423	cbBuf = _128K;
424	pbBuf = pbBufFree = (uint8_t *)RTMemTmpAlloc(cbBuf);
425	}
426	if (pbBuf)
427	{
428	/*
429	* Seek to the start of each file
430	* and set the size of the destination file.
431	*/
432	rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_BEGIN, NULL);
433	if (RT_SUCCESS(rc))
434	{
435	rc = RTFileSeek(FileDst, 0, RTFILE_SEEK_BEGIN, NULL);
436	if (RT_SUCCESS(rc))
437	rc = RTFileSetSize(FileDst, cbSrc);
438	if (RT_SUCCESS(rc) && pfnProgress)
439	rc = pfnProgress(0, pvUser);
440	if (RT_SUCCESS(rc))
441	{
442	/*
443	* Copy loop.
444	*/
445	unsigned uPercentage = 0;
446	RTFOFF off = 0;
447	RTFOFF cbPercent = cbSrc / 100;
448	RTFOFF offNextPercent = cbPercent;
449	while (off < cbSrc)
450	{
451	/* copy block */
452	RTFOFF cbLeft = cbSrc - off;
453	size_t cbBlock = cbLeft >= (RTFOFF)cbBuf ? cbBuf : (size_t)cbLeft;
454	rc = RTFileRead(FileSrc, pbBuf, cbBlock, NULL);
455	if (RT_FAILURE(rc))
456	break;
457	rc = RTFileWrite(FileDst, pbBuf, cbBlock, NULL);
458	if (RT_FAILURE(rc))
459	break;
460
461	/* advance */
462	off += cbBlock;
463	if (pfnProgress && offNextPercent < off)
464	{
465	while (offNextPercent < off)
466	{
467	uPercentage++;
468	offNextPercent += cbPercent;
469	}
470	rc = pfnProgress(uPercentage, pvUser);
471	if (RT_FAILURE(rc))
472	break;
473	}
474	}
475
476	#if 0
477	/*
478	* Copy OS specific data (EAs and stuff).
479	*/
480	rtFileCopyOSStuff(FileSrc, FileDst);
481	#endif
482
483	/* 100% */
484	if (pfnProgress && uPercentage < 100 && RT_SUCCESS(rc))
485	rc = pfnProgress(100, pvUser);
486	}
487	}
488	RTMemTmpFree(pbBufFree);
489	}
490	else
491	rc = VERR_NO_MEMORY;
492
493	/*
494	* Restore source position.
495	*/
496	RTFileSeek(FileSrc, offSrcSaved, RTFILE_SEEK_BEGIN, NULL);
497
498	return rc;
499	}
500

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source: vbox/trunk/src/VBox/Runtime/r3/fileio.cpp@ 8170

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