VBoxSF-Utils.cpp@ 96407

Last change on this file since 96407 was 96407, checked in by vboxsync, 2 years ago
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1	/* $Id: VBoxSF-Utils.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VBoxSF - Darwin Shared Folders, Utility Functions.
4	*/
5
6	/*
7	* Copyright (C) 2013-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
33	#include "VBoxSFInternal.h"
34
35	#include <iprt/assert.h>
36	#include <iprt/mem.h>
37	#include <VBox/log.h>
38
39	#if 0
40	/**
41	* Helper function to create XNU VFS vnode object.
42	*
43	* @param mp Mount data structure
44	* @param type vnode type (directory, regular file, etc)
45	* @param pParent Parent vnode object (NULL for VBoxVFS root vnode)
46	* @param fIsRoot Flag that indicates if created vnode object is
47	* VBoxVFS root vnode (TRUE for VBoxVFS root vnode, FALSE
48	* for all aother vnodes)
49	* @param Path within Shared Folder
50	* @param ret Returned newly created vnode
51	*
52	* @return 0 on success, error code otherwise
53	*/
54	int
55	vboxvfs_create_vnode_internal(struct mount mp, enum vtype type, vnode_t pParent, int fIsRoot, PSHFLSTRING Path, vnode_t ret)
56	{
57	int rc;
58	vnode_t vnode;
59
60	vboxvfs_vnode_t *pVnodeData;
61	vboxvfs_mount_t *pMount;
62
63	AssertReturn(mp, EINVAL);
64
65	pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp);
66	AssertReturn(pMount, EINVAL);
67	AssertReturn(pMount->pLockGroup, EINVAL);
68
69	AssertReturn(Path, EINVAL);
70
71	pVnodeData = (vboxvfs_vnode_t *)RTMemAllocZ(sizeof(vboxvfs_vnode_t));
72	AssertReturn(pVnodeData, ENOMEM);
73
74	/* Initialize private data */
75	pVnodeData->pHandle = SHFL_HANDLE_NIL;
76	pVnodeData->pPath = Path;
77
78	pVnodeData->pLockAttr = lck_attr_alloc_init();
79	if (pVnodeData->pLockAttr)
80	{
81	pVnodeData->pLock = lck_rw_alloc_init(pMount->pLockGroup, pVnodeData->pLockAttr);
82	if (pVnodeData->pLock)
83	{
84	struct vnode_fsparam vnode_params;
85
86	vnode_params.vnfs_mp = mp;
87	vnode_params.vnfs_vtype = type;
88	vnode_params.vnfs_str = NULL;
89	vnode_params.vnfs_dvp = pParent;
90	vnode_params.vnfs_fsnode = pVnodeData; /** Private data attached per xnu's vnode object */
91	vnode_params.vnfs_vops = g_papfnVBoxVFSVnodeDirOpsVector;
92
93	vnode_params.vnfs_markroot = fIsRoot;
94	vnode_params.vnfs_marksystem = FALSE;
95	vnode_params.vnfs_rdev = 0;
96	vnode_params.vnfs_filesize = 0;
97	vnode_params.vnfs_cnp = NULL;
98
99	vnode_params.vnfs_flags = VNFS_ADDFSREF \| VNFS_NOCACHE;
100
101	rc = vnode_create(VNCREATE_FLAVOR, sizeof(vnode_params), &vnode_params, &vnode);
102	if (rc == 0)
103	*ret = vnode;
104
105	return 0;
106	}
107	else
108	{
109	PDEBUG("Unable to allocate lock");
110	rc = ENOMEM;
111	}
112
113	lck_attr_free(pVnodeData->pLockAttr);
114	}
115	else
116	{
117	PDEBUG("Unable to allocate lock attr");
118	rc = ENOMEM;
119	}
120
121	return rc;
122	}
123
124	/**
125	* Convert guest absolute VFS path (starting from VFS root) to a host path
126	* within mounted shared folder (returning it as a char *).
127	*
128	* @param mp Mount data structure
129	* @param pszGuestPath Guest absolute VFS path (starting from VFS root)
130	* @param cbGuestPath Size of pszGuestPath
131	* @param pszHostPath Returned char * wich contains host path
132	* @param cbHostPath Returned pszHostPath size
133	*
134	* @return 0 on success, error code otherwise
135	*/
136	int
137	vboxvfs_guest_path_to_char_path_internal(mount_t mp, char pszGuestPath, int cbGuestPath, char pszHostPath, int cbHostPath)
138	{
139	vboxvfs_mount_t *pMount;
140
141	/* Guest side: mount point path buffer and its size */
142	char *pszMntPointPath;
143	int cbMntPointPath = MAXPATHLEN;
144
145	/* Host side: path within mounted shared folder and its size */
146	char *pszHostPathInternal;
147	size_t cbHostPathInternal;
148
149	int rc;
150
151	AssertReturn(mp, EINVAL);
152	AssertReturn(pszGuestPath, EINVAL); AssertReturn(cbGuestPath >= 0, EINVAL);
153	AssertReturn(pszHostPath, EINVAL); AssertReturn(cbHostPath, EINVAL);
154
155	pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp); AssertReturn(pMount, EINVAL); AssertReturn(pMount->pRootVnode, EINVAL);
156
157	/* Get mount point path */
158	pszMntPointPath = (char *)RTMemAllocZ(cbMntPointPath);
159	if (pszMntPointPath)
160	{
161	rc = vn_getpath(pMount->pRootVnode, pszMntPointPath, &cbMntPointPath);
162	if (rc == 0 && cbGuestPath >= cbMntPointPath)
163	{
164	cbHostPathInternal = cbGuestPath - cbMntPointPath + 1;
165	pszHostPathInternal = (char *)RTMemAllocZ(cbHostPathInternal);
166	if (pszHostPathInternal)
167	{
168	memcpy(pszHostPathInternal, pszGuestPath + cbMntPointPath, cbGuestPath - cbMntPointPath);
169	PDEBUG("guest<->host path converion result: '%s' mounted to '%s'", pszHostPathInternal, pszMntPointPath);
170
171	RTMemFree(pszMntPointPath);
172
173	*pszHostPath = pszHostPathInternal;
174	*cbHostPath = cbGuestPath - cbMntPointPath;
175
176	return 0;
177
178	}
179	else
180	{
181	PDEBUG("No memory to allocate buffer for guest<->host path conversion (cbHostPathInternal)");
182	rc = ENOMEM;
183	}
184
185	}
186	else
187	{
188	PDEBUG("Unable to get guest vnode path: %d", rc);
189	}
190
191	RTMemFree(pszMntPointPath);
192	}
193	else
194	{
195	PDEBUG("No memory to allocate buffer for guest<->host path conversion (pszMntPointPath)");
196	rc = ENOMEM;
197	}
198
199	return rc;
200	}
201
202	/**
203	* Convert guest absolute VFS path (starting from VFS root) to a host path
204	* within mounted shared folder.
205	*
206	* @param mp Mount data structure
207	* @param pszGuestPath Guest absolute VFS path (starting from VFS root)
208	* @param cbGuestPath Size of pszGuestPath
209	* @param ppResult Returned PSHFLSTRING object wich contains host path
210	*
211	* @return 0 on success, error code otherwise
212	*/
213	int
214	vboxvfs_guest_path_to_shflstring_path_internal(mount_t mp, char pszGuestPath, int cbGuestPath, PSHFLSTRING ppResult)
215	{
216	vboxvfs_mount_t *pMount;
217
218	/* Guest side: mount point path buffer and its size */
219	char *pszMntPointPath;
220	int cbMntPointPath = MAXPATHLEN;
221
222	/* Host side: path within mounted shared folder and its size */
223	PSHFLSTRING pSFPath;
224	size_t cbSFPath;
225
226	int rc;
227
228	AssertReturn(mp, EINVAL);
229	AssertReturn(pszGuestPath, EINVAL);
230	AssertReturn(cbGuestPath >= 0, EINVAL);
231
232	char *pszHostPath;
233	int cbHostPath;
234
235	rc = vboxvfs_guest_path_to_char_path_internal(mp, pszGuestPath, cbGuestPath, &pszHostPath, &cbHostPath);
236	if (rc == 0)
237	{
238	cbSFPath = offsetof(SHFLSTRING, String.utf8) + (size_t)cbHostPath + 1;
239	pSFPath = (PSHFLSTRING)RTMemAllocZ(cbSFPath);
240	if (pSFPath)
241	{
242	pSFPath->u16Length = cbHostPath;
243	pSFPath->u16Size = cbHostPath + 1;
244	memcpy(pSFPath->String.utf8, pszHostPath, cbHostPath);
245	vboxvfs_put_path_internal((void **)&pszHostPath);
246
247	*ppResult = pSFPath;
248	}
249	}
250
251	return rc;
252	}
253
254	/**
255	* Wrapper function for vboxvfs_guest_path_to_char_path_internal() which
256	* converts guest path to host path using vnode object information.
257	*
258	* @param vnode Guest's VFS object
259	* @param ppHostPath Allocated char * which contain a path
260	* @param pcbPath Size of ppPath
261	*
262	* @return 0 on success, error code otherwise.
263	*/
264	int
265	vboxvfs_guest_vnode_to_char_path_internal(vnode_t vnode, char *ppHostPath, int pcbHostPath)
266	{
267	mount_t mp;
268	int rc;
269
270	char *pszPath;
271	int cbPath = MAXPATHLEN;
272
273	AssertReturn(ppHostPath, EINVAL);
274	AssertReturn(pcbHostPath, EINVAL);
275	AssertReturn(vnode, EINVAL);
276	mp = vnode_mount(vnode); AssertReturn(mp, EINVAL);
277
278	pszPath = (char *)RTMemAllocZ(cbPath);
279	if (pszPath)
280	{
281	rc = vn_getpath(vnode, pszPath, &cbPath);
282	if (rc == 0)
283	{
284	return vboxvfs_guest_path_to_char_path_internal(mp, pszPath, cbPath, ppHostPath, pcbHostPath);
285	}
286	}
287	else
288	{
289	rc = ENOMEM;
290	}
291
292	return rc;
293	}
294
295	/**
296	* Wrapper function for vboxvfs_guest_path_to_shflstring_path_internal() which
297	* converts guest path to host path using vnode object information.
298	*
299	* @param vnode Guest's VFS object
300	* @param ppResult Allocated PSHFLSTRING object which contain a path
301	*
302	* @return 0 on success, error code otherwise.
303	*/
304	int
305	vboxvfs_guest_vnode_to_shflstring_path_internal(vnode_t vnode, PSHFLSTRING *ppResult)
306	{
307	mount_t mp;
308	int rc;
309
310	char *pszPath;
311	int cbPath = MAXPATHLEN;
312
313	AssertReturn(ppResult, EINVAL);
314	AssertReturn(vnode, EINVAL);
315	mp = vnode_mount(vnode); AssertReturn(mp, EINVAL);
316
317	pszPath = (char *)RTMemAllocZ(cbPath);
318	if (pszPath)
319	{
320	rc = vn_getpath(vnode, pszPath, &cbPath);
321	if (rc == 0)
322	{
323	return vboxvfs_guest_path_to_shflstring_path_internal(mp, pszPath, cbPath, ppResult);
324	}
325	}
326	else
327	{
328	rc = ENOMEM;
329	}
330
331	return rc;
332	}
333
334
335	/**
336	* Free resources allocated by vboxvfs_path_internal() and vboxvfs_guest_vnode_to_shflstring_path_internal().
337	*
338	* @param ppHandle Reference to object to be freed.
339	*/
340	void
341	vboxvfs_put_path_internal(void **ppHandle)
342	{
343	AssertReturnVoid(ppHandle);
344	AssertReturnVoid(*ppHandle);
345	RTMemFree(*ppHandle);
346	}
347
348	static void
349	vboxvfs_g2h_mode_dump_inernal(uint32_t fHostMode)
350	{
351	PDEBUG("Host VFS object flags (0x%X) dump:", (int)fHostMode);
352
353	if (fHostMode & SHFL_CF_ACCESS_READ) PDEBUG("SHFL_CF_ACCESS_READ");
354	if (fHostMode & SHFL_CF_ACCESS_WRITE) PDEBUG("SHFL_CF_ACCESS_WRITE");
355	if (fHostMode & SHFL_CF_ACCESS_APPEND) PDEBUG("SHFL_CF_ACCESS_APPEND");
356
357	if ((fHostMode & (SHFL_CF_ACT_FAIL_IF_EXISTS \|
358	SHFL_CF_ACT_REPLACE_IF_EXISTS \|
359	SHFL_CF_ACT_OVERWRITE_IF_EXISTS)) == 0)
360	PDEBUG("SHFL_CF_ACT_OPEN_IF_EXISTS");
361
362	if (fHostMode & SHFL_CF_ACT_CREATE_IF_NEW) PDEBUG("SHFL_CF_ACT_CREATE_IF_NEW");
363	if (fHostMode & SHFL_CF_ACT_FAIL_IF_NEW) PDEBUG("SHFL_CF_ACT_FAIL_IF_NEW");
364	if (fHostMode & SHFL_CF_ACT_OVERWRITE_IF_EXISTS) PDEBUG("SHFL_CF_ACT_OVERWRITE_IF_EXISTS");
365	if (fHostMode & SHFL_CF_DIRECTORY) PDEBUG("SHFL_CF_DIRECTORY");
366
367	PDEBUG("Done");
368	}
369
370
371	/**
372	* Open existing VBoxVFS object and return its handle.
373	*
374	* @param pMount Mount session data.
375	* @param pPath VFS path to the object relative to mount point.
376	* @param fFlags For directory object it should be
377	* SHFL_CF_DIRECTORY and 0 for any other object.
378	* @param pHandle Returned handle.
379	*
380	* @return 0 on success, error code otherwise.
381	*/
382	int
383	vboxvfs_open_internal(vboxvfs_mount_t pMount, PSHFLSTRING pPath, uint32_t fFlags, SHFLHANDLE pHandle)
384	{
385	SHFLCREATEPARMS parms;
386
387	int rc;
388
389	AssertReturn(pMount, EINVAL);
390	AssertReturn(pPath, EINVAL);
391	AssertReturn(pHandle, EINVAL);
392
393	bzero(&parms, sizeof(parms));
394
395	vboxvfs_g2h_mode_dump_inernal(fFlags);
396
397	parms.Handle = SHFL_HANDLE_NIL;
398	parms.Info.cbObject = 0;
399	parms.CreateFlags = fFlags;
400
401	rc = VbglR0SfCreate(&g_SfClientDarwin, &pMount->pMap, pPath, &parms);
402	if (RT_SUCCESS(rc))
403	{
404	*pHandle = parms.Handle;
405	}
406	else
407	{
408	PDEBUG("vboxvfs_open_internal() failed: %d", rc);
409	}
410
411	return rc;
412	}
413
414	/**
415	* Release VBoxVFS object handle openned by vboxvfs_open_internal().
416	*
417	* @param pMount Mount session data.
418	* @param pHandle Handle to close.
419	*
420	* @return 0 on success, IPRT error code otherwise.
421	*/
422	int
423	vboxvfs_close_internal(vboxvfs_mount_t *pMount, SHFLHANDLE pHandle)
424	{
425	AssertReturn(pMount, EINVAL);
426	return VbglR0SfClose(&g_SfClientDarwin, &pMount->pMap, pHandle);
427	}
428
429	/**
430	* Get information about host VFS object.
431	*
432	* @param mp Mount point data
433	* @param pSHFLDPath Path to VFS object within mounted shared folder
434	* @param Info Returned info
435	*
436	* @return 0 on success, error code otherwise.
437	*/
438	int
439	vboxvfs_get_info_internal(mount_t mp, PSHFLSTRING pSHFLDPath, PSHFLFSOBJINFO Info)
440	{
441	vboxvfs_mount_t *pMount;
442	SHFLCREATEPARMS parms;
443
444	int rc;
445
446	AssertReturn(mp, EINVAL);
447	AssertReturn(pSHFLDPath, EINVAL);
448	AssertReturn(Info, EINVAL);
449
450	pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp); AssertReturn(pMount, EINVAL);
451
452	parms.Handle = 0;
453	parms.Info.cbObject = 0;
454	parms.CreateFlags = SHFL_CF_LOOKUP \| SHFL_CF_ACT_FAIL_IF_NEW;
455
456	rc = VbglR0SfCreate(&g_SfClientDarwin, &pMount->pMap, pSHFLDPath, &parms);
457	if (rc == 0)
458	*Info = parms.Info;
459
460	return rc;
461	}
462
463	/**
464	* Check if VFS object exists on a host side.
465	*
466	* @param vnode Guest VFS vnode that corresponds to host VFS object
467	*
468	* @return 1 if exists, 0 otherwise.
469	*/
470	int
471	vboxvfs_exist_internal(vnode_t vnode)
472	{
473	int rc;
474
475	PSHFLSTRING pSFPath = NULL;
476	SHFLHANDLE handle;
477	uint32_t fFlags;
478
479	vboxvfs_mount_t *pMount;
480	mount_t mp;
481
482	/* Return FALSE if invalid parameter given */
483	AssertReturn(vnode, 0);
484
485	mp = vnode_mount(vnode); AssertReturn(mp, EINVAL);
486	pMount = (vboxvfs_mount_t *)vfs_fsprivate(mp); AssertReturn(pMount, EINVAL);
487
488	fFlags = (vnode_isdir(vnode)) ? SHFL_CF_DIRECTORY : 0;
489	fFlags \|= SHFL_CF_ACCESS_READ \| SHFL_CF_ACT_OPEN_IF_EXISTS \| SHFL_CF_ACT_FAIL_IF_NEW;
490
491	rc = vboxvfs_guest_vnode_to_shflstring_path_internal(vnode, &pSFPath); AssertReturn(rc == 0, rc);
492	if (rc == 0)
493	{
494	rc = vboxvfs_open_internal(pMount, pSFPath, fFlags, &handle);
495	if (rc == 0)
496	{
497	rc = vboxvfs_close_internal(pMount, handle);
498	if (rc != 0)
499	{
500	PDEBUG("Unable to close() VBoxVFS object handle while checking if object exist on host: %d", rc);
501	}
502	}
503	}
504
505	vboxvfs_put_path_internal((void **)&pSFPath);
506
507	return (rc == 0);
508	}
509
510	/**
511	* Convert host VFS object mode flags into guest ones.
512	*
513	* @param fHostMode Host flags
514	*
515	* @return Guest flags
516	*/
517	mode_t
518	vboxvfs_h2g_mode_inernal(RTFMODE fHostMode)
519	{
520	mode_t fGuestMode = 0;
521
522	fGuestMode = /* Owner */
523	((fHostMode & RTFS_UNIX_IRUSR) ? S_IRUSR : 0 ) \|
524	((fHostMode & RTFS_UNIX_IWUSR) ? S_IWUSR : 0 ) \|
525	((fHostMode & RTFS_UNIX_IXUSR) ? S_IXUSR : 0 ) \|
526	/* Group */
527	((fHostMode & RTFS_UNIX_IRGRP) ? S_IRGRP : 0 ) \|
528	((fHostMode & RTFS_UNIX_IWGRP) ? S_IWGRP : 0 ) \|
529	((fHostMode & RTFS_UNIX_IXGRP) ? S_IXGRP : 0 ) \|
530	/* Other */
531	((fHostMode & RTFS_UNIX_IROTH) ? S_IROTH : 0 ) \|
532	((fHostMode & RTFS_UNIX_IWOTH) ? S_IWOTH : 0 ) \|
533	((fHostMode & RTFS_UNIX_IXOTH) ? S_IXOTH : 0 ) \|
534	/* SUID, SGID, SVTXT */
535	((fHostMode & RTFS_UNIX_ISUID) ? S_ISUID : 0 ) \|
536	((fHostMode & RTFS_UNIX_ISGID) ? S_ISGID : 0 ) \|
537	((fHostMode & RTFS_UNIX_ISTXT) ? S_ISVTX : 0 ) \|
538	/* VFS object types */
539	((RTFS_IS_FIFO(fHostMode)) ? S_IFIFO : 0 ) \|
540	((RTFS_IS_DEV_CHAR(fHostMode)) ? S_IFCHR : 0 ) \|
541	((RTFS_IS_DIRECTORY(fHostMode)) ? S_IFDIR : 0 ) \|
542	((RTFS_IS_DEV_BLOCK(fHostMode)) ? S_IFBLK : 0 ) \|
543	((RTFS_IS_FILE(fHostMode)) ? S_IFREG : 0 ) \|
544	((RTFS_IS_SYMLINK(fHostMode)) ? S_IFLNK : 0 ) \|
545	((RTFS_IS_SOCKET(fHostMode)) ? S_IFSOCK : 0 );
546
547	return fGuestMode;
548	}
549
550	/**
551	* Convert guest VFS object mode flags into host ones.
552	*
553	* @param fGuestMode Host flags
554	*
555	* @return Host flags
556	*/
557	uint32_t
558	vboxvfs_g2h_mode_inernal(mode_t fGuestMode)
559	{
560	uint32_t fHostMode = 0;
561
562	fHostMode = ((fGuestMode & FREAD) ? SHFL_CF_ACCESS_READ : 0 ) \|
563	((fGuestMode & FWRITE) ? SHFL_CF_ACCESS_WRITE : 0 ) \|
564	/* skipped: O_NONBLOCK */
565	((fGuestMode & O_APPEND) ? SHFL_CF_ACCESS_APPEND : 0 ) \|
566	/* skipped: O_SYNC */
567	/* skipped: O_SHLOCK */
568	/* skipped: O_EXLOCK */
569	/* skipped: O_ASYNC */
570	/* skipped: O_FSYNC */
571	/* skipped: O_NOFOLLOW */
572	((fGuestMode & O_CREAT) ? SHFL_CF_ACT_CREATE_IF_NEW \| (!(fGuestMode & O_TRUNC) ? SHFL_CF_ACT_OPEN_IF_EXISTS : 0) : SHFL_CF_ACT_OPEN_IF_EXISTS \| SHFL_CF_ACT_FAIL_IF_NEW ) \|
573	((fGuestMode & O_TRUNC) ? SHFL_CF_ACT_OVERWRITE_IF_EXISTS \| SHFL_CF_ACCESS_WRITE : 0 );
574	/* skipped: O_EXCL */
575
576	return fHostMode;
577	}
578
579	/**
580	* Mount helper: Contruct SHFLSTRING which contains VBox share name or path.
581	*
582	* @returns Initialize string buffer on success, NULL if out of memory.
583	* @param pachName The string to pack in a buffer. Does not need to be
584	* zero terminated.
585	* @param cchName The length of pachName to use. RTSTR_MAX for strlen.
586	*/
587	SHFLSTRING *
588	vboxvfs_construct_shflstring(const char *pachName, size_t cchName)
589	{
590	AssertReturn(pachName, NULL);
591
592	if (cchName == RTSTR_MAX)
593	cchName = strlen(pachName);
594
595	SHFLSTRING pSHFLString = (SHFLSTRING )RTMemAlloc(SHFLSTRING_HEADER_SIZE + cchName + 1);
596	if (pSHFLString)
597	{
598	pSHFLString->u16Length = cchName;
599	pSHFLString->u16Size = cchName + 1;
600	memcpy(pSHFLString->String.utf8, pachName, cchName);
601	pSHFLString->String.utf8[cchName] = '\0';
602
603	return pSHFLString;
604	}
605	return NULL;
606	}
607
608	#endif

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source: vbox/trunk/src/VBox/Additions/darwin/VBoxSF/VBoxSF-Utils.cpp@ 96407

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