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source: vbox/trunk/include/iprt/tar.h@ 43667

Last change on this file since 43667 was 33804, checked in by vboxsync, 14 years ago

iprt/tar.h: some review, clean and adding documentation.

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1/** @file
2 * IPRT - Tar archive I/O.
3 */
4
5/*
6 * Copyright (C) 2009-2010 Oracle Corporation
7 *
8 * This file is part of VirtualBox Open Source Edition (OSE), as
9 * available from http://www.virtualbox.org. This file is free software;
10 * you can redistribute it and/or modify it under the terms of the GNU
11 * General Public License (GPL) as published by the Free Software
12 * Foundation, in version 2 as it comes in the "COPYING" file of the
13 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15 *
16 * The contents of this file may alternatively be used under the terms
17 * of the Common Development and Distribution License Version 1.0
18 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19 * VirtualBox OSE distribution, in which case the provisions of the
20 * CDDL are applicable instead of those of the GPL.
21 *
22 * You may elect to license modified versions of this file under the
23 * terms and conditions of either the GPL or the CDDL or both.
24 */
25
26#ifndef ___iprt_tar_h
27#define ___iprt_tar_h
28
29#include <iprt/cdefs.h>
30#include <iprt/types.h>
31#include <iprt/time.h>
32
33RT_C_DECLS_BEGIN
34
35/** @defgroup grp_rt_tar RTTar - Tar archive I/O
36 * @ingroup grp_rt
37 * @{
38 */
39
40/** A tar handle */
41typedef R3PTRTYPE(struct RTTARINTERNAL *) RTTAR;
42/** Pointer to a RTTAR interface handle. */
43typedef RTTAR *PRTTAR;
44/** Nil RTTAR interface handle. */
45#define NIL_RTTAR ((RTTAR)0)
46
47/** A tar file handle */
48typedef R3PTRTYPE(struct RTTARFILEINTERNAL *) RTTARFILE;
49/** Pointer to a RTTARFILE interface handle. */
50typedef RTTARFILE *PRTTARFILE;
51/** Nil RTTARFILE interface handle. */
52#define NIL_RTTARFILE ((RTTARFILE)0)
53
54/**
55 * Opens a Tar archive.
56 *
57 * Use the mask to specify the access type. In create mode the target file
58 * have not to exists.
59 *
60 * @returns IPRT status code.
61 *
62 * @param phTar Where to store the RTTAR handle.
63 * @param pszTarname The file name of the tar archive to open.
64 * @param fMode Open flags, i.e a combination of the RTFILE_O_* defines.
65 * The ACCESS, ACTION and DENY flags are mandatory!
66 * @param fStream Open the file in stream mode. Within this mode no
67 * seeking is allowed. Use this together with
68 * RTTarFileCurrent, RTTarFileOpenCurrent,
69 * RTTarFileSeekNextFile and the read method to
70 * sequential read a tar file. Currently ignored with
71 * RTFILE_O_WRITE.
72 */
73RTR3DECL(int) RTTarOpen(PRTTAR phTar, const char *pszTarname, uint32_t fMode, bool fStream);
74
75#if 0
76/**
77 * Opens a Tar archive by handle.
78 *
79 * Use the mask to specify the access type. In create mode the target file
80 * have not to exists.
81 *
82 * @returns IPRT status code.
83 *
84 * @param phTar Where to store the RTTAR handle.
85 * @param hFile The file handle of the tar file. This is expected
86 * to be a regular file at the moment.
87 * @param fStream Open the file in stream mode. Within this mode no
88 * seeking is allowed. Use this together with
89 * RTTarFileCurrent, RTTarFileOpenCurrent,
90 * RTTarFileSeekNextFile and the read method to
91 * sequential read a tar file. Currently ignored with
92 * RTFILE_O_WRITE.
93 */
94RTR3DECL(int) RTTarOpenByHandle(PRTTAR phTar, RTFILE hFile, uint32_t fMode, bool fStream);
95#endif
96
97/**
98 * Close the Tar archive.
99 *
100 * @returns IPRT status code.
101 *
102 * @param hTar Handle to the RTTAR interface.
103 */
104RTR3DECL(int) RTTarClose(RTTAR hTar);
105
106/**
107 * Open a file in the Tar archive.
108 *
109 * @returns IPRT status code.
110 *
111 * @param hTar The handle of the tar archive.
112 * @param phFile Where to store the handle to the opened file.
113 * @param pszFilename Path to the file which is to be opened. (UTF-8)
114 * @param fOpen Open flags, i.e a combination of the RTFILE_O_* defines.
115 * The ACCESS, ACTION flags are mandatory! DENY flags
116 * are currently not supported.
117 *
118 * @remarks Write mode means append mode only. It is not possible to make
119 * changes to existing files.
120 *
121 * @remarks Currently it is not possible to open more than one file in write
122 * mode. Although open more than one file in read only mode (even when
123 * one file is opened in write mode) is always possible.
124 */
125RTR3DECL(int) RTTarFileOpen(RTTAR hTar, PRTTARFILE phFile, const char *pszFilename, uint32_t fOpen);
126
127/**
128 * Close the file opened by RTTarFileOpen.
129 *
130 * @returns IPRT status code.
131 *
132 * @param hFile The file handle to close.
133 */
134RTR3DECL(int) RTTarFileClose(RTTARFILE hFile);
135
136/**
137 * Changes the read & write position in a file.
138 *
139 * @returns IPRT status code.
140 *
141 * @param hFile Handle to the file.
142 * @param offSeek Offset to seek.
143 * @param uMethod Seek method, i.e. one of the RTFILE_SEEK_* defines.
144 * @param poffActual Where to store the new file position.
145 * NULL is allowed.
146 */
147RTR3DECL(int) RTTarFileSeek(RTTARFILE hFile, uint64_t offSeek, unsigned uMethod, uint64_t *poffActual);
148
149/**
150 * Gets the current file position.
151 *
152 * @returns File offset.
153 * @returns UINT64_MAX on failure.
154 *
155 * @param hFile Handle to the file.
156 */
157RTR3DECL(uint64_t) RTTarFileTell(RTTARFILE hFile);
158
159/**
160 * Read bytes from a file.
161 *
162 * @returns IPRT status code.
163 *
164 * @param hFile Handle to the file.
165 * @param pvBuf Where to put the bytes we read.
166 * @param cbToRead How much to read.
167 * @param *pcbRead How much we actually read .
168 * If NULL an error will be returned for a partial read.
169 */
170RTR3DECL(int) RTTarFileRead(RTTARFILE hFile, void *pvBuf, size_t cbToRead, size_t *pcbRead);
171
172/**
173 * Read bytes from a file at a given offset.
174 * This function may modify the file position.
175 *
176 * @returns IPRT status code.
177 *
178 * @param hFile Handle to the file.
179 * @param off Where to read.
180 * @param pvBuf Where to put the bytes we read.
181 * @param cbToRead How much to read.
182 * @param *pcbRead How much we actually read .
183 * If NULL an error will be returned for a partial read.
184 */
185RTR3DECL(int) RTTarFileReadAt(RTTARFILE hFile, uint64_t off, void *pvBuf, size_t cbToRead, size_t *pcbRead);
186
187/**
188 * Write bytes to a file.
189 *
190 * @returns IPRT status code.
191 *
192 * @param hFile Handle to the file.
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 */
198RTR3DECL(int) RTTarFileWrite(RTTARFILE hFile, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten);
199
200/**
201 * Write bytes to a file at a given offset.
202 * This function may modify the file position.
203 *
204 * @returns IPRT status code.
205 *
206 * @param hFile Handle to the file.
207 * @param off Where to write.
208 * @param pvBuf What to write.
209 * @param cbToWrite How much to write.
210 * @param *pcbWritten How much we actually wrote.
211 * If NULL an error will be returned for a partial write.
212 */
213RTR3DECL(int) RTTarFileWriteAt(RTTARFILE hFile, uint64_t off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten);
214
215/**
216 * Query the size of the file.
217 *
218 * @returns IPRT status code.
219 *
220 * @param hFile Handle to the file.
221 * @param pcbSize Where to store the filesize.
222 */
223RTR3DECL(int) RTTarFileGetSize(RTTARFILE hFile, uint64_t *pcbSize);
224
225/**
226 * Set the size of the file.
227 *
228 * @returns IPRT status code.
229 *
230 * @param hFile Handle to the file.
231 * @param cbSize The new file size.
232 */
233RTR3DECL(int) RTTarFileSetSize(RTTARFILE hFile, uint64_t cbSize);
234
235/**
236 * Gets the mode flags of an open file.
237 *
238 * @returns IPRT status code.
239 *
240 * @param hFile Handle to the file.
241 * @param pfMode Where to store the file mode, see @ref grp_rt_fs for details.
242 */
243RTR3DECL(int) RTTarFileGetMode(RTTARFILE hFile, uint32_t *pfMode);
244
245/**
246 * Changes the mode flags of an open file.
247 *
248 * @returns IPRT status code.
249 *
250 * @param hFile Handle to the file.
251 * @param fMode The new file mode, see @ref grp_rt_fs for details.
252 */
253RTR3DECL(int) RTTarFileSetMode(RTTARFILE hFile, uint32_t fMode);
254
255/**
256 * Gets the modification timestamp of the file.
257 *
258 * @returns IPRT status code.
259 *
260 * @param pFile Handle to the file.
261 * @param pTime Where to store the time.
262 */
263RTR3DECL(int) RTTarFileGetTime(RTTARFILE hFile, PRTTIMESPEC pTime);
264
265/**
266 * Sets the modification timestamp of the file.
267 *
268 * @returns IPRT status code.
269 *
270 * @param pFile Handle to the file.
271 * @param pTime The time to store.
272 */
273RTR3DECL(int) RTTarFileSetTime(RTTARFILE hFile, PRTTIMESPEC pTime);
274
275/**
276 * Gets the owner and/or group of an open file.
277 *
278 * @returns IPRT status code.
279 *
280 * @param hFile Handle to the file.
281 * @param pUid Where to store the owner user id. NULL is ok.
282 * @param pGid Where to store the group id. NULL is ok.
283 */
284RTR3DECL(int) RTTarFileGetOwner(RTTARFILE hFile, uint32_t *pUid, uint32_t *pGid);
285
286/**
287 * Changes the owner and/or group of an open file.
288 *
289 * @returns IPRT status code.
290 *
291 * @param hFile Handle to the file.
292 * @param uid The new file owner user id. Use -1 (or ~0) to leave this unchanged.
293 * @param gid The new group id. Use -1 (or ~0) to leave this unchanged.
294 */
295RTR3DECL(int) RTTarFileSetOwner(RTTARFILE hFile, uint32_t uid, uint32_t gid);
296
297/******************************************************************************
298 * Convenience Functions *
299 ******************************************************************************/
300
301/**
302 * Check if the specified file exists in the Tar archive.
303 *
304 * (The matching is case sensitive.)
305 *
306 * @note Currently only regular files are supported.
307 *
308 * @returns IPRT status code.
309 * @retval VINF_SUCCESS when the file exists in the Tar archive.
310 * @retval VERR_FILE_NOT_FOUND when the file not exists in the Tar archive.
311 *
312 * @param pszTarFile Tar file to check.
313 * @param pszFile Filename to check for.
314 *
315 * @todo This is predicate function which SHALL return bool!
316 */
317RTR3DECL(int) RTTarFileExists(const char *pszTarFile, const char *pszFile);
318
319/**
320 * Create a file list from a Tar archive.
321 *
322 * @note Currently only regular files are supported.
323 *
324 * @returns IPRT status code.
325 *
326 * @param pszTarFile Tar file to list files from.
327 * @param ppapszFiles On success an array with array with the filenames is
328 * returned. The names must be freed with RTStrFree and
329 * the array with RTMemFree.
330 * @param pcFiles On success the number of entries in ppapszFiles.
331 */
332RTR3DECL(int) RTTarList(const char *pszTarFile, char ***ppapszFiles, size_t *pcFiles);
333
334/**
335 * Extract a file from a Tar archive into a memory buffer.
336 *
337 * The caller is responsible for the deletion of the returned memory buffer.
338 *
339 * (The matching is case sensitive.)
340 *
341 * @note Currently only regular files are supported. Also some of the header
342 * fields are not used (uid, gid, uname, gname, mtime).
343 *
344 * @returns IPRT status code.
345 *
346 * @param pszTarFile Tar file to extract files from.
347 * @param ppBuf The buffer which will held the extracted data.
348 * @param pcbSize The size (in bytes) of ppBuf after successful
349 * extraction.
350 * @param pszFile The file to extract.
351 * @param pfnProgressCallback Progress callback function. Optional.
352 * @param pvUser User defined data for the progress
353 * callback. Optional.
354 */
355RTR3DECL(int) RTTarExtractFileToBuf(const char *pszTarFile, void **ppvBuf, size_t *pcbSize, const char *pszFile,
356 PFNRTPROGRESS pfnProgressCallback, void *pvUser);
357
358/**
359 * Extract a set of files from a Tar archive.
360 *
361 * Also note that this function is atomic. If an error occurs all previously
362 * extracted files will be deleted.
363 *
364 * (The matching is case sensitive.)
365 *
366 * @note Currently only regular files are supported. Also some of the header
367 * fields are not used (uid, gid, uname, gname, mtime).
368 *
369 * @returns IPRT status code.
370 *
371 * @param pszTarFile Tar file to extract files from.
372 * @param pszOutputDir Where to store the extracted files. Must exist.
373 * @param papszFiles Which files should be extracted.
374 * @param cFiles The number of files in papszFiles.
375 * @param pfnProgressCallback Progress callback function. Optional.
376 * @param pvUser User defined data for the progress
377 * callback. Optional.
378 */
379RTR3DECL(int) RTTarExtractFiles(const char *pszTarFile, const char *pszOutputDir, const char * const *papszFiles, size_t cFiles, PFNRTPROGRESS pfnProgressCallback, void *pvUser);
380
381/**
382 * Extract all files of the archive.
383 *
384 * @note Currently only regular files are supported. Also some of the header
385 * fields are not used (uid, gid, uname, gname, mtime).
386 *
387 * @returns IPRT status code.
388 *
389 * @param pszTarFile Tar file to extract the files from.
390 * @param pszOutputDir Where to store the extracted files. Must exist.
391 * @param pfnProgressCallback Progress callback function. Optional.
392 * @param pvUser User defined data for the progress
393 * callback. Optional.
394 */
395RTR3DECL(int) RTTarExtractAll(const char *pszTarFile, const char *pszOutputDir, PFNRTPROGRESS pfnProgressCallback, void *pvUser);
396
397/**
398 * Create a Tar archive out of the given files.
399 *
400 * @note Currently only regular files are supported.
401 *
402 * @returns IPRT status code.
403 *
404 * @param pszTarFile Where to create the Tar archive.
405 * @param papszFiles Which files should be included.
406 * @param cFiles The number of files in papszFiles.
407 * @param pfnProgressCallback Progress callback function. Optional.
408 * @param pvUser User defined data for the progress
409 * callback. Optional.
410 */
411RTR3DECL(int) RTTarCreate(const char *pszTarFile, const char * const *papszFiles, size_t cFiles, PFNRTPROGRESS pfnProgressCallback, void *pvUser);
412
413/******************************************************************************
414 * Streaming Functions *
415 ******************************************************************************/
416
417/**
418 * Return the filename where RTTar currently stays at.
419 *
420 * @returns IPRT status code.
421 *
422 * @param hTar Handle to the RTTAR interface.
423 * @param ppszFilename On success the filename.
424 */
425RTR3DECL(int) RTTarCurrentFile(RTTAR hTar, char **ppszFilename);
426
427/**
428 * Jumps to the next file from the current RTTar position.
429 *
430 * @returns IPRT status code.
431 *
432 * @param hTar Handle to the RTTAR interface.
433 */
434RTR3DECL(int) RTTarSeekNextFile(RTTAR hTar);
435
436/**
437 * Opens the file where RTTar currently stays at.
438 *
439 * @returns IPRT status code.
440 *
441 * @param hTar Handle to the RTTAR interface.
442 * @param phFile Where to store the handle to the opened file.
443 * @param ppszFilename On success the filename.
444 * @param fOpen Open flags, i.e a combination of the RTFILE_O_* defines.
445 * The ACCESS, ACTION flags are mandatory! Currently
446 * only RTFILE_O_OPEN | RTFILE_O_READ is supported.
447 */
448RTR3DECL(int) RTTarFileOpenCurrentFile(RTTAR hTar, PRTTARFILE phFile, char **ppszFilename, uint32_t fOpen);
449
450
451/** @} */
452
453RT_C_DECLS_END
454
455#endif /* ___iprt_tar_h */
456
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