fileio.cpp@ 977

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1	/* $Id: fileio.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - File I/O.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#include <iprt/file.h>
26	#include <iprt/alloc.h>
27	#include <iprt/assert.h>
28	#include <iprt/alloca.h>
29	#include <iprt/err.h>
30	#include "internal/file.h"
31
32
33	/*******************************************************************************
34	* Global Variables *
35	*******************************************************************************/
36	/** Set of forced set open flags for files opened read-only. */
37	static unsigned g_fOpenReadSet = 0;
38
39	/** Set of forced cleared open flags for files opened read-only. */
40	static unsigned g_fOpenReadMask = 0;
41
42	/** Set of forced set open flags for files opened write-only. */
43	static unsigned g_fOpenWriteSet = 0;
44
45	/** Set of forced cleared open flags for files opened write-only. */
46	static unsigned g_fOpenWriteMask = 0;
47
48	/** Set of forced set open flags for files opened read-write. */
49	static unsigned g_fOpenReadWriteSet = 0;
50
51	/** Set of forced cleared open flags for files opened read-write. */
52	static unsigned g_fOpenReadWriteMask = 0;
53
54
55	/**
56	* Force the use of open flags for all files opened after the setting is
57	* changed. The caller is responsible for not causing races with RTFileOpen().
58	*
59	* @returns iprt status code.
60	* @param fOpenForAccess Access mode to which the set/mask settings apply.
61	* @param fSet Open flags to be forced set.
62	* @param fMask Open flags to be masked out.
63	*/
64	RTR3DECL(int) RTFileSetForceFlags(unsigned fOpenForAccess, unsigned fSet, unsigned fMask)
65	{
66	/*
67	* For now allow only RTFILE_O_WRITE_THROUGH. The other flags either
68	* make no sense in this context or are not useful to apply to all files.
69	*/
70	if ((fSet \| fMask) & ~RTFILE_O_WRITE_THROUGH)
71	return VERR_INVALID_PARAMETER;
72	switch (fOpenForAccess)
73	{
74	case RTFILE_O_READ:
75	g_fOpenReadSet = fSet;
76	g_fOpenReadMask = fMask;
77	break;
78	case RTFILE_O_WRITE:
79	g_fOpenWriteSet = fSet;
80	g_fOpenWriteMask = fMask;
81	break;
82	case RTFILE_O_READWRITE:
83	g_fOpenReadWriteSet = fSet;
84	g_fOpenReadWriteMask = fMask;
85	break;
86	default:
87	AssertMsgFailed(("Invalid access mode %d\n", fOpenForAccess));
88	return VERR_INVALID_PARAMETER;
89	}
90	return VINF_SUCCESS;
91	}
92
93
94	/**
95	* Adjusts and validates the flags.
96	*
97	* The adjustments are made according to the wishes specified using the RTFileSetForceFlags API.
98	*
99	* @returns IPRT status code.
100	* @param pfOpen Pointer to the user specified flags on input.
101	* Updated on successful return.
102	* @internal
103	*/
104	int rtFileRecalcAndValidateFlags(unsigned *pfOpen)
105	{
106	/*
107	* Recalc.
108	*/
109	unsigned fOpen = *pfOpen;
110	switch (fOpen & RTFILE_O_ACCESS_MASK)
111	{
112	case RTFILE_O_READ:
113	fOpen \|= g_fOpenReadSet;
114	fOpen &= ~g_fOpenReadMask;
115	break;
116	case RTFILE_O_WRITE:
117	fOpen \|= g_fOpenWriteSet;
118	fOpen &= ~g_fOpenWriteMask;
119	break;
120	case RTFILE_O_READWRITE:
121	fOpen \|= g_fOpenReadWriteSet;
122	fOpen &= ~g_fOpenReadWriteMask;
123	break;
124	default:
125	AssertMsgFailed(("RTFileOpen received an invalid RW value, fOpen=%#x\n", fOpen));
126	return VERR_INVALID_PARAMETER;
127	}
128
129	/*
130	* Validate .
131	*/
132	if ( (fOpen & (~RTFILE_O_VALID_MASK \| RTFILE_O_NON_BLOCK))
133	\|\| !(fOpen & RTFILE_O_ACCESS_MASK)
134	\|\| (fOpen & (RTFILE_O_TRUNCATE \| RTFILE_O_DENY_WRITE)) == RTFILE_O_TRUNCATE
135	)
136	{
137	AssertMsgFailed(("Invalid parameters! fOpen=%#x\n", fOpen));
138	return VERR_INVALID_PARAMETER;
139	}
140
141	/* done */
142	*pfOpen = fOpen;
143	return VINF_SUCCESS;
144	}
145
146
147
148	/**
149	* Read bytes from a file at a given offset.
150	* This function may modify the file position.
151	*
152	* @returns iprt status code.
153	* @param File Handle to the file.
154	* @param off Where to read.
155	* @param pvBuf Where to put the bytes we read.
156	* @param cbToRead How much to read.
157	* @param *pcbRead How much we actually read.
158	* If NULL an error will be returned for a partial read.
159	*/
160	RTR3DECL(int) RTFileReadAt(RTFILE File, RTFOFF off, void pvBuf, unsigned cbToRead, unsigned pcbRead)
161	{
162	int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
163	if (RT_SUCCESS(rc))
164	rc = RTFileRead(File, pvBuf, cbToRead, pcbRead);
165	return rc;
166	}
167
168
169	/**
170	* Write bytes to a file at a given offset.
171	* This function may modify the file position.
172	*
173	* @returns iprt status code.
174	* @param File Handle to the file.
175	* @param off Where to write.
176	* @param pvBuf What to write.
177	* @param cbToWrite How much to write.
178	* @param *pcbWritten How much we actually wrote.
179	* If NULL an error will be returned for a partial write.
180	*/
181	RTR3DECL(int) RTFileWriteAt(RTFILE File, RTFOFF off, const void pvBuf, unsigned cbToWrite, unsigned pcbWritten)
182	{
183	int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
184	if (RT_SUCCESS(rc))
185	rc = RTFileWrite(File, pvBuf, cbToWrite, pcbWritten);
186	return rc;
187	}
188
189
190	/**
191	* Gets the current file position.
192	*
193	* @returns File offset.
194	* @returns ~0UUL on failure.
195	* @param File File handle.
196	*/
197	RTR3DECL(uint64_t) RTFileTell(RTFILE File)
198	{
199	/*
200	* Call the seek api to query the stuff.
201	*/
202	uint64_t off = 0;
203	int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, &off);
204	if (RT_SUCCESS(rc))
205	return off;
206	AssertMsgFailed(("RTFileSeek(%d) -> %d\n", File, rc));
207	return ~0ULL;
208	}
209
210
211	/**
212	* Copies a file given the handles to both files.
213	*
214	* @returns VBox Status code.
215	*
216	* @param FileSrc The source file. The file position is unaltered.
217	* @param FileDst The destination file.
218	* On successful returns the file position is at the end of the file.
219	* On failures the file position and size is undefined.
220	*/
221	RTDECL(int) RTFileCopyByHandles(RTFILE FileSrc, RTFILE FileDst)
222	{
223	return RTFileCopyByHandlesEx(FileSrc, FileDst, NULL, NULL);
224	}
225
226
227	/**
228	* Copies a file.
229	*
230	* @returns VERR_ALREADY_EXISTS if the destination file exists.
231	* @returns VBox Status code.
232	*
233	* @param pszSrc The path to the source file.
234	* @param pszDst The path to the destination file.
235	* This file will be created.
236	* @param pfnProgress Pointer to callback function for reporting progress.
237	* @param pvUser User argument to pass to pfnProgress along with the completion precentage.
238	*/
239	RTDECL(int) RTFileCopyEx(const char pszSrc, const char pszDst, PFNRTPROGRESS pfnProgress, void *pvUser)
240	{
241	/*
242	* Validate input.
243	*/
244	AssertMsgReturn(VALID_PTR(pszSrc), ("pszSrc=%p\n", pszSrc), VERR_INVALID_PARAMETER);
245	AssertMsgReturn(*pszSrc, ("pszSrc=%p\n", pszSrc), VERR_INVALID_PARAMETER);
246	AssertMsgReturn(VALID_PTR(pszDst), ("pszDst=%p\n", pszDst), VERR_INVALID_PARAMETER);
247	AssertMsgReturn(*pszDst, ("pszDst=%p\n", pszDst), VERR_INVALID_PARAMETER);
248	AssertMsgReturn(!pfnProgress \|\| VALID_PTR(pfnProgress), ("pfnProgress=%p\n", pfnProgress), VERR_INVALID_PARAMETER);
249
250	/*
251	* Open the files.
252	*/
253	RTFILE FileSrc;
254	int rc = RTFileOpen(&FileSrc, pszSrc, RTFILE_O_READ \| RTFILE_O_DENY_WRITE \| RTFILE_O_OPEN);
255	if (RT_SUCCESS(rc))
256	{
257	RTFILE FileDst;
258	rc = RTFileOpen(&FileDst, pszDst, RTFILE_O_WRITE \| RTFILE_O_DENY_WRITE \| RTFILE_O_CREATE);
259	if (RT_SUCCESS(rc))
260	{
261	/*
262	* Call the ByHandles version and let it do the job.
263	*/
264	rc = RTFileCopyByHandlesEx(FileSrc, FileDst, pfnProgress, pvUser);
265
266	/*
267	* Close the files regardless of the result.
268	* Don't bother cleaning up or anything like that.
269	*/
270	int rc2 = RTFileClose(FileDst);
271	AssertRC(rc2);
272	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
273	rc = rc2;
274	}
275
276	int rc2 = RTFileClose(FileSrc);
277	AssertRC(rc2);
278	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
279	rc = rc2;
280	}
281	return rc;
282	}
283
284
285	/**
286	* Copies a file given the handles to both files and
287	* provide progress callbacks.
288	*
289	* @returns VBox Status code.
290	*
291	* @param FileSrc The source file. The file position is unaltered.
292	* @param FileDst The destination file.
293	* On successful returns the file position is at the end of the file.
294	* On failures the file position and size is undefined.
295	* @param pfnProgress Pointer to callback function for reporting progress.
296	* @param pvUser User argument to pass to pfnProgress along with the completion precentage.
297	*/
298	RTDECL(int) RTFileCopyByHandlesEx(RTFILE FileSrc, RTFILE FileDst, PFNRTPROGRESS pfnProgress, void *pvUser)
299	{
300	/*
301	* Validate input.
302	*/
303	AssertMsgReturn(RTFileIsValid(FileSrc), ("FileSrc=%RTfile\n", FileSrc), VERR_INVALID_PARAMETER);
304	AssertMsgReturn(RTFileIsValid(FileDst), ("FileDst=%RTfile\n", FileDst), VERR_INVALID_PARAMETER);
305	AssertMsgReturn(!pfnProgress \|\| VALID_PTR(pfnProgress), ("pfnProgress=%p\n", pfnProgress), VERR_INVALID_PARAMETER);
306
307	/*
308	* Save file offset.
309	*/
310	RTFOFF offSrcSaved;
311	int rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offSrcSaved);
312	if (RT_FAILURE(rc))
313	return rc;
314
315	/*
316	* Get the file size.
317	*/
318	RTFOFF cbSrc;
319	rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_END, (uint64_t *)&cbSrc);
320	if (RT_FAILURE(rc))
321	return rc;
322
323	/*
324	* Allocate buffer.
325	*/
326	size_t cbBuf;
327	uint8_t *pbBufFree = NULL;
328	uint8_t *pbBuf;
329	if (cbSrc < _512K)
330	{
331	cbBuf = 8*_1K;
332	pbBuf = (uint8_t *)alloca(cbBuf);
333	}
334	else
335	{
336	cbBuf = _128K;
337	pbBuf = pbBufFree = (uint8_t *)RTMemTmpAlloc(cbBuf);
338	}
339	if (pbBuf)
340	{
341	/*
342	* Seek to the start of each file
343	* and set the size of the destination file.
344	*/
345	rc = RTFileSeek(FileSrc, 0, RTFILE_SEEK_BEGIN, NULL);
346	if (RT_SUCCESS(rc))
347	{
348	rc = RTFileSeek(FileDst, 0, RTFILE_SEEK_BEGIN, NULL);
349	if (RT_SUCCESS(rc))
350	rc = RTFileSetSize(FileDst, cbSrc);
351	if (RT_SUCCESS(rc) && pfnProgress)
352	rc = pfnProgress(0, pvUser);
353	if (RT_SUCCESS(rc))
354	{
355	/*
356	* Copy loop.
357	*/
358	unsigned uPercentage = 0;
359	RTFOFF off = 0;
360	RTFOFF cbPercent = cbSrc / 100;
361	RTFOFF offNextPercent = cbPercent;
362	while (off < cbSrc)
363	{
364	/* copy block */
365	RTFOFF cbLeft = cbSrc - off;
366	size_t cbBlock = cbLeft >= (RTFOFF)cbBuf ? cbBuf : (size_t)cbLeft;
367	rc = RTFileRead(FileSrc, pbBuf, cbBlock, NULL);
368	if (RT_FAILURE(rc))
369	break;
370	rc = RTFileWrite(FileDst, pbBuf, cbBlock, NULL);
371	if (RT_FAILURE(rc))
372	break;
373
374	/* advance */
375	off += cbBlock;
376	if (pfnProgress && offNextPercent < off)
377	{
378	while (offNextPercent < off)
379	{
380	uPercentage++;
381	offNextPercent += cbPercent;
382	}
383	rc = pfnProgress(uPercentage, pvUser);
384	if (RT_FAILURE(rc))
385	break;
386	}
387	}
388
389	#if 0
390	/*
391	* Copy OS specific data (EAs and stuff).
392	*/
393	rtFileCopyOSStuff(FileSrc, FileDst);
394	#endif
395
396	/* 100% */
397	if (pfnProgress && uPercentage < 100 && RT_SUCCESS(rc))
398	rc = pfnProgress(100, pvUser);
399	}
400	}
401	RTMemTmpFree(pbBufFree);
402	}
403	else
404	rc = VERR_NO_MEMORY;
405
406	/*
407	* Restore source position.
408	*/
409	RTFileSeek(FileSrc, offSrcSaved, RTFILE_SEEK_BEGIN, NULL);
410
411	return rc;
412	}
413

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source: vbox/trunk/src/VBox/Runtime/fileio.cpp@ 977

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