tstVBoxAPIXPCOM.cpp@ 98103

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1	/* $Id: tstVBoxAPIXPCOM.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	*
4	* tstVBoxAPIXPCOM - sample program to illustrate the VirtualBox
5	* XPCOM API for machine management.
6	* It only uses standard C/C++ and XPCOM semantics,
7	* no additional VBox classes/macros/helpers.
8	*/
9
10	/*
11	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
12	*
13	* This file is part of VirtualBox base platform packages, as
14	* available from https://www.virtualbox.org.
15	*
16	* This program is free software; you can redistribute it and/or
17	* modify it under the terms of the GNU General Public License
18	* as published by the Free Software Foundation, in version 3 of the
19	* License.
20	*
21	* This program is distributed in the hope that it will be useful, but
22	* WITHOUT ANY WARRANTY; without even the implied warranty of
23	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24	* General Public License for more details.
25	*
26	* You should have received a copy of the GNU General Public License
27	* along with this program; if not, see <https://www.gnu.org/licenses>.
28	*
29	* SPDX-License-Identifier: GPL-3.0-only
30	*/
31
32	/*
33	* PURPOSE OF THIS SAMPLE PROGRAM
34	* ------------------------------
35	*
36	* This sample program is intended to demonstrate the minimal code necessary
37	* to use VirtualBox XPCOM API for learning puroses only. The program uses
38	* pure XPCOM and doesn't have any extra dependencies to let you better
39	* understand what is going on when a client talks to the VirtualBox core
40	* using the XPCOM framework.
41	*
42	* However, if you want to write a real application, it is highly recommended
43	* to use our MS COM XPCOM Glue library and helper C++ classes. This way, you
44	* will get at least the following benefits:
45	*
46	* a) better portability: both the MS COM (used on Windows) and XPCOM (used
47	* everywhere else) VirtualBox client application from the same source code
48	* (including common smart C++ templates for automatic interface pointer
49	* reference counter and string data management);
50	* b) simpler XPCOM initialization and shutdown (only a single method call
51	* that does everything right).
52	*
53	* Currently, there is no separate sample program that uses the VirtualBox MS
54	* COM XPCOM Glue library. Please refer to the sources of stock VirtualBox
55	* applications such as the VirtualBox GUI frontend or the VBoxManage command
56	* line frontend.
57	*
58	*
59	* RUNNING THIS SAMPLE PROGRAM
60	* ---------------------------
61	*
62	* This sample program needs to know where the VirtualBox core files reside
63	* and where to search for VirtualBox shared libraries. Therefore, you need to
64	* use the following (or similar) command to execute it:
65	*
66	* $ env VBOX_XPCOM_HOME=../../.. LD_LIBRARY_PATH=../../.. ./tstVBoxAPIXPCOM
67	*
68	* The above command assumes that VBoxRT.so, VBoxXPCOM.so and others reside in
69	* the directory ../../..
70	*/
71
72
73	#include <stdio.h>
74	#include <stdlib.h>
75	#include <iconv.h>
76
77	/*
78	* Include the XPCOM headers
79	*/
80	#include <nsMemory.h>
81	#include <nsString.h>
82	#include <nsIServiceManager.h>
83	#include <nsEventQueueUtils.h>
84
85	#include <nsIExceptionService.h>
86
87	/*
88	* VirtualBox XPCOM interface. This header is generated
89	* from IDL which in turn is generated from a custom XML format.
90	*/
91	#include "VirtualBox_XPCOM.h"
92
93	/*
94	* Prototypes
95	*/
96
97	char nsIDToString(nsID guid);
98	void printErrorInfo();
99
100
101	/**
102	* Display all registered VMs on the screen with some information about each
103	*
104	* @param virtualBox VirtualBox instance object.
105	*/
106	void listVMs(IVirtualBox *virtualBox)
107	{
108	nsresult rc;
109
110	printf("----------------------------------------------------\n");
111	printf("VM List:\n\n");
112
113	/*
114	* Get the list of all registered VMs
115	*/
116	IMachine **machines = NULL;
117	PRUint32 cMachines = 0;
118
119	rc = virtualBox->GetMachines(&cMachines, &machines);
120	if (NS_SUCCEEDED(rc))
121	{
122	/*
123	* Iterate through the collection
124	*/
125	for (PRUint32 i = 0; i < cMachines; ++ i)
126	{
127	IMachine *machine = machines[i];
128	if (machine)
129	{
130	PRBool isAccessible = PR_FALSE;
131	machine->GetAccessible(&isAccessible);
132
133	if (isAccessible)
134	{
135	nsXPIDLString machineName;
136	machine->GetName(getter_Copies(machineName));
137	char *machineNameAscii = ToNewCString(machineName);
138	printf("\tName: %s\n", machineNameAscii);
139	free(machineNameAscii);
140	}
141	else
142	{
143	printf("\tName: <inaccessible>\n");
144	}
145
146	nsXPIDLString iid;
147	machine->GetId(getter_Copies(iid));
148	const char *uuidString = ToNewCString(iid);
149	printf("\tUUID: %s\n", uuidString);
150	free((void*)uuidString);
151
152	if (isAccessible)
153	{
154	nsXPIDLString configFile;
155	machine->GetSettingsFilePath(getter_Copies(configFile));
156	char *configFileAscii = ToNewCString(configFile);
157	printf("\tConfig file: %s\n", configFileAscii);
158	free(configFileAscii);
159
160	PRUint32 memorySize;
161	machine->GetMemorySize(&memorySize);
162	printf("\tMemory size: %uMB\n", memorySize);
163
164	nsXPIDLString typeId;
165	machine->GetOSTypeId(getter_Copies(typeId));
166	IGuestOSType *osType = nsnull;
167	virtualBox->GetGuestOSType(typeId.get(), &osType);
168	nsXPIDLString osName;
169	osType->GetDescription(getter_Copies(osName));
170	char *osNameAscii = ToNewCString(osName);
171	printf("\tGuest OS: %s\n\n", osNameAscii);
172	free(osNameAscii);
173	osType->Release();
174	}
175
176	/* don't forget to release the objects in the array... */
177	machine->Release();
178	}
179	}
180	nsMemory::Free(machines);
181	}
182	printf("----------------------------------------------------\n\n");
183	}
184
185	/**
186	* Create a sample VM
187	*
188	* @param virtualBox VirtualBox instance object.
189	*/
190	void createVM(IVirtualBox *virtualBox)
191	{
192	nsresult rc;
193	/*
194	* First create a unnamed new VM. It will be unconfigured and not be saved
195	* in the configuration until we explicitely choose to do so.
196	*/
197	nsCOMPtr<IMachine> machine;
198	rc = virtualBox->CreateMachine(NULL, /* settings file */
199	NS_LITERAL_STRING("A brand new name").get(),
200	0, nsnull, /* groups (safearray)*/
201	nsnull, /* ostype */
202	nsnull, /* create flags */
203	nsnull, /* cipher */
204	nsnull, /* password id */
205	nsnull, /* password */
206	getter_AddRefs(machine));
207	if (NS_FAILED(rc))
208	{
209	printf("Error: could not create machine! rc=%#x\n", rc);
210	return;
211	}
212
213	/*
214	* Set some properties
215	*/
216	/* alternative to illustrate the use of string classes */
217	rc = machine->SetName(NS_ConvertUTF8toUTF16("A new name").get());
218	rc = machine->SetMemorySize(128);
219
220	/*
221	* Now a more advanced property -- the guest OS type. This is
222	* an object by itself which has to be found first. Note that we
223	* use the ID of the guest OS type here which is an internal
224	* representation (you can find that by configuring the OS type of
225	* a machine in the GUI and then looking at the <Guest ostype=""/>
226	* setting in the XML file. It is also possible to get the OS type from
227	* its description (win2k would be "Windows 2000") by getting the
228	* guest OS type collection and enumerating it.
229	*/
230	nsCOMPtr<IGuestOSType> osType;
231	rc = virtualBox->GetGuestOSType(NS_LITERAL_STRING("Windows2000").get(),
232	getter_AddRefs(osType));
233	if (NS_FAILED(rc))
234	{
235	printf("Error: could not find guest OS type! rc=%#x\n", rc);
236	}
237	else
238	{
239	machine->SetOSTypeId(NS_LITERAL_STRING("Windows2000").get());
240	}
241
242	/*
243	* Register the VM. Note that this call also saves the VM config
244	* to disk. It is also possible to save the VM settings but not
245	* register the VM.
246	*
247	* Also note that due to current VirtualBox limitations, the machine
248	* must be registered before we can attach hard disks to it.
249	*/
250	rc = virtualBox->RegisterMachine(machine);
251	if (NS_FAILED(rc))
252	{
253	printf("Error: could not register machine! rc=%#x\n", rc);
254	printErrorInfo();
255	return;
256	}
257
258	nsCOMPtr<IMachine> origMachine = machine;
259
260	/*
261	* In order to manipulate the registered machine, we must open a session
262	* for that machine. Do it now.
263	*/
264	nsCOMPtr<ISession> session;
265	nsCOMPtr<IMachine> sessionMachine;
266	{
267	nsCOMPtr<nsIComponentManager> manager;
268	rc = NS_GetComponentManager(getter_AddRefs(manager));
269	if (NS_FAILED(rc))
270	{
271	printf("Error: could not get component manager! rc=%#x\n", rc);
272	return;
273	}
274	rc = manager->CreateInstanceByContractID(NS_SESSION_CONTRACTID,
275	nsnull,
276	NS_GET_IID(ISession),
277	getter_AddRefs(session));
278	if (NS_FAILED(rc))
279	{
280	printf("Error, could not instantiate session object! rc=%#x\n", rc);
281	return;
282	}
283
284	rc = machine->LockMachine(session, LockType_Write);
285	if (NS_FAILED(rc))
286	{
287	printf("Error, could not lock the machine for the session! rc=%#x\n", rc);
288	return;
289	}
290
291	/*
292	* After the machine is registered, the initial machine object becomes
293	* immutable. In order to get a mutable machine object, we must query
294	* it from the opened session object.
295	*/
296	rc = session->GetMachine(getter_AddRefs(sessionMachine));
297	if (NS_FAILED(rc))
298	{
299	printf("Error, could not get machine session! rc=%#x\n", rc);
300	return;
301	}
302	}
303
304	/*
305	* Create a virtual harddisk
306	*/
307	nsCOMPtr<IMedium> hardDisk = 0;
308	rc = virtualBox->CreateMedium(NS_LITERAL_STRING("VDI").get(),
309	NS_LITERAL_STRING("/tmp/TestHardDisk.vdi").get(),
310	AccessMode_ReadWrite, DeviceType_HardDisk,
311	getter_AddRefs(hardDisk));
312	if (NS_FAILED(rc))
313	{
314	printf("Failed creating a hard disk object! rc=%#x\n", rc);
315	}
316	else
317	{
318	/*
319	* We have only created an object so far. No on disk representation exists
320	* because none of its properties has been set so far. Let's continue creating
321	* a dynamically expanding image.
322	*/
323	nsCOMPtr<IProgress> progress;
324	MediumVariant_T mediumVariants[] =
325	{ MediumVariant_Standard };
326	rc = hardDisk->CreateBaseStorage(100 * 1024 * 1024, // size in bytes
327	sizeof(mediumVariants) / sizeof(mediumVariants[0]), mediumVariants,
328	getter_AddRefs(progress)); // optional progress object
329	if (NS_FAILED(rc))
330	{
331	printf("Failed creating hard disk image! rc=%#x\n", rc);
332	}
333	else
334	{
335	/*
336	* Creating the image is done in the background because it can take quite
337	* some time (at least fixed size images). We have to wait for its completion.
338	* Here we wait forever (timeout -1) which is potentially dangerous.
339	*/
340	rc = progress->WaitForCompletion(-1);
341	PRInt32 resultCode;
342	progress->GetResultCode(&resultCode);
343	if (NS_FAILED(rc) \|\| NS_FAILED(resultCode))
344	{
345	printf("Error: could not create hard disk! rc=%#x\n",
346	NS_FAILED(rc) ? rc : resultCode);
347	}
348	else
349	{
350	/*
351	* Now that it's created, we can assign it to the VM.
352	*/
353	rc = sessionMachine->AttachDevice(
354	NS_LITERAL_STRING("IDE Controller").get(), // controller identifier
355	0, // channel number on the controller
356	0, // device number on the controller
357	DeviceType_HardDisk,
358	hardDisk);
359	if (NS_FAILED(rc))
360	{
361	printf("Error: could not attach hard disk! rc=%#x\n", rc);
362	}
363	}
364	}
365	}
366
367	/*
368	* It's got a hard disk but that one is new and thus not bootable. Make it
369	* boot from an ISO file. This requires some processing. First the ISO file
370	* has to be registered and then mounted to the VM's DVD drive and selected
371	* as the boot device.
372	*/
373	nsCOMPtr<IMedium> dvdImage;
374	rc = virtualBox->OpenMedium(NS_LITERAL_STRING("/home/vbox/isos/winnt4ger.iso").get(),
375	DeviceType_DVD,
376	AccessMode_ReadOnly,
377	false /* fForceNewUuid */,
378	getter_AddRefs(dvdImage));
379	if (NS_FAILED(rc))
380	printf("Error: could not open CD image! rc=%#x\n", rc);
381	else
382	{
383	/*
384	* Now assign it to our VM
385	*/
386	rc = sessionMachine->MountMedium(
387	NS_LITERAL_STRING("IDE Controller").get(), // controller identifier
388	2, // channel number on the controller
389	0, // device number on the controller
390	dvdImage,
391	PR_FALSE); // aForce
392	if (NS_FAILED(rc))
393	{
394	printf("Error: could not mount ISO image! rc=%#x\n", rc);
395	}
396	else
397	{
398	/*
399	* Last step: tell the VM to boot from the CD.
400	*/
401	rc = sessionMachine->SetBootOrder(1, DeviceType::DVD);
402	if (NS_FAILED(rc))
403	{
404	printf("Could not set boot device! rc=%#x\n", rc);
405	}
406	}
407	}
408
409	/*
410	* Save all changes we've just made.
411	*/
412	rc = sessionMachine->SaveSettings();
413	if (NS_FAILED(rc))
414	printf("Could not save machine settings! rc=%#x\n", rc);
415
416	/*
417	* It is always important to close the open session when it becomes not
418	* necessary any more.
419	*/
420	session->UnlockMachine();
421
422	IMedium **aMedia;
423	PRUint32 cMedia;
424	rc = machine->Unregister((CleanupMode_T)CleanupMode_DetachAllReturnHardDisksOnly,
425	&cMedia, &aMedia);
426	if (NS_FAILED(rc))
427	printf("Unregistering the machine failed! rc=%#x\n", rc);
428	else
429	{
430	nsCOMPtr<IProgress> pProgress;
431	rc = machine->DeleteConfig(cMedia, aMedia, getter_AddRefs(pProgress));
432	if (NS_FAILED(rc))
433	printf("Deleting of machine failed! rc=%#x\n", rc);
434	else
435	{
436	rc = pProgress->WaitForCompletion(-1);
437	PRInt32 resultCode;
438	pProgress->GetResultCode(&resultCode);
439	if (NS_FAILED(rc) \|\| NS_FAILED(resultCode))
440	printf("Failed to delete the machine! rc=%#x\n",
441	NS_FAILED(rc) ? rc : resultCode);
442	}
443
444	/* Release the media array: */
445	for (PRUint32 i = 0; i < cMedia; i++)
446	if (aMedia[i])
447	aMedia[i]->Release();
448	nsMemory::Free(aMedia);
449	}
450	}
451
452	// main
453	///////////////////////////////////////////////////////////////////////////////
454
455	int main(int argc, char **argv)
456	{
457	/*
458	* Check that PRUnichar is equal in size to what compiler composes L""
459	* strings from; otherwise NS_LITERAL_STRING macros won't work correctly
460	* and we will get a meaningless SIGSEGV. This, of course, must be checked
461	* at compile time in xpcom/string/nsTDependentString.h, but XPCOM lacks
462	* compile-time assert macros and I'm not going to add them now.
463	*/
464	if (sizeof(PRUnichar) != sizeof(wchar_t))
465	{
466	printf("Error: sizeof(PRUnichar) {%lu} != sizeof(wchar_t) {%lu}!\n"
467	"Probably, you forgot the -fshort-wchar compiler option.\n",
468	(unsigned long) sizeof(PRUnichar),
469	(unsigned long) sizeof(wchar_t));
470	return -1;
471	}
472
473	#if 1 /* Please ignore this! It is very very crude. */
474	# ifdef RTPATH_APP_PRIVATE_ARCH
475	if (!getenv("VBOX_XPCOM_HOME"))
476	setenv("VBOX_XPCOM_HOME", RTPATH_APP_PRIVATE_ARCH, 1);
477	# else
478	char szTmp[8192];
479	if (!getenv("VBOX_XPCOM_HOME"))
480	{
481	strcpy(szTmp, argv[0]);
482	*strrchr(szTmp, '/') = '\0';
483	strcat(szTmp, "/..");
484	fprintf(stderr, "tstVBoxAPIXPCOM: VBOX_XPCOM_HOME is not set, using '%s' instead\n", szTmp);
485	setenv("VBOX_XPCOM_HOME", szTmp, 1);
486	}
487	# endif
488	#endif
489	(void)argc; (void)argv;
490
491	nsresult rc;
492
493	/*
494	* This is the standard XPCOM init procedure.
495	* What we do is just follow the required steps to get an instance
496	* of our main interface, which is IVirtualBox.
497	*
498	* Note that we scope all nsCOMPtr variables in order to have all XPCOM
499	* objects automatically released before we call NS_ShutdownXPCOM at the
500	* end. This is an XPCOM requirement.
501	*/
502	{
503	nsCOMPtr<nsIServiceManager> serviceManager;
504	rc = NS_InitXPCOM2(getter_AddRefs(serviceManager), nsnull, nsnull);
505	if (NS_FAILED(rc))
506	{
507	printf("Error: XPCOM could not be initialized! rc=%#x\n", rc);
508	return -1;
509	}
510
511	#if 0
512	/*
513	* Register our components. This step is only necessary if this executable
514	* implements XPCOM components itself which is not the case for this
515	* simple example.
516	*/
517	nsCOMPtr<nsIComponentRegistrar> registrar = do_QueryInterface(serviceManager);
518	if (!registrar)
519	{
520	printf("Error: could not query nsIComponentRegistrar interface!\n");
521	return -1;
522	}
523	registrar->AutoRegister(nsnull);
524	#endif
525
526	/*
527	* Make sure the main event queue is created. This event queue is
528	* responsible for dispatching incoming XPCOM IPC messages. The main
529	* thread should run this event queue's loop during lengthy non-XPCOM
530	* operations to ensure messages from the VirtualBox server and other
531	* XPCOM IPC clients are processed. This use case doesn't perform such
532	* operations so it doesn't run the event loop.
533	*/
534	nsCOMPtr<nsIEventQueue> eventQ;
535	rc = NS_GetMainEventQ(getter_AddRefs(eventQ));
536	if (NS_FAILED(rc))
537	{
538	printf("Error: could not get main event queue! rc=%#x\n", rc);
539	return -1;
540	}
541
542	/*
543	* Now XPCOM is ready and we can start to do real work.
544	* IVirtualBox is the root interface of VirtualBox and will be
545	* retrieved from the XPCOM component manager. We use the
546	* XPCOM provided smart pointer nsCOMPtr for all objects because
547	* that's very convenient and removes the need deal with reference
548	* counting and freeing.
549	*/
550	nsCOMPtr<nsIComponentManager> manager;
551	rc = NS_GetComponentManager(getter_AddRefs(manager));
552	if (NS_FAILED(rc))
553	{
554	printf("Error: could not get component manager! rc=%#x\n", rc);
555	return -1;
556	}
557
558	nsCOMPtr<IVirtualBox> virtualBox;
559	rc = manager->CreateInstanceByContractID(NS_VIRTUALBOX_CONTRACTID,
560	nsnull,
561	NS_GET_IID(IVirtualBox),
562	getter_AddRefs(virtualBox));
563	if (NS_FAILED(rc))
564	{
565	printf("Error, could not instantiate VirtualBox object! rc=%#x\n", rc);
566	return -1;
567	}
568	printf("VirtualBox object created\n");
569
570	////////////////////////////////////////////////////////////////////////////////
571	////////////////////////////////////////////////////////////////////////////////
572	////////////////////////////////////////////////////////////////////////////////
573
574
575	listVMs(virtualBox);
576
577	createVM(virtualBox);
578
579
580	////////////////////////////////////////////////////////////////////////////////
581	////////////////////////////////////////////////////////////////////////////////
582	////////////////////////////////////////////////////////////////////////////////
583
584	/* this is enough to free the IVirtualBox instance -- smart pointers rule! */
585	virtualBox = nsnull;
586
587	/*
588	* Process events that might have queued up in the XPCOM event
589	* queue. If we don't process them, the server might hang.
590	*/
591	eventQ->ProcessPendingEvents();
592	}
593
594	/*
595	* Perform the standard XPCOM shutdown procedure.
596	*/
597	NS_ShutdownXPCOM(nsnull);
598	printf("Done!\n");
599	return 0;
600	}
601
602
603	//////////////////////////////////////////////////////////////////////////////////////////////////////
604	//// Helpers
605	//////////////////////////////////////////////////////////////////////////////////////////////////////
606
607	/**
608	* Helper function to convert an nsID into a human readable string
609	*
610	* @returns result string, allocated. Has to be freed using free()
611	* @param guid Pointer to nsID that will be converted.
612	*/
613	char nsIDToString(nsID guid)
614	{
615	char res = (char)malloc(39);
616
617	if (res != NULL)
618	{
619	snprintf(res, 39, "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
620	guid->m0, (PRUint32)guid->m1, (PRUint32)guid->m2,
621	(PRUint32)guid->m3[0], (PRUint32)guid->m3[1], (PRUint32)guid->m3[2],
622	(PRUint32)guid->m3[3], (PRUint32)guid->m3[4], (PRUint32)guid->m3[5],
623	(PRUint32)guid->m3[6], (PRUint32)guid->m3[7]);
624	}
625	return res;
626	}
627
628	/**
629	* Helper function to print XPCOM exception information set on the current
630	* thread after a failed XPCOM method call. This function will also print
631	* extended VirtualBox error info if it is available.
632	*/
633	void printErrorInfo()
634	{
635	nsresult rc;
636
637	nsCOMPtr<nsIExceptionService> es;
638	es = do_GetService(NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
639	if (NS_SUCCEEDED(rc))
640	{
641	nsCOMPtr<nsIExceptionManager> em;
642	rc = es->GetCurrentExceptionManager(getter_AddRefs(em));
643	if (NS_SUCCEEDED(rc))
644	{
645	nsCOMPtr<nsIException> ex;
646	rc = em->GetCurrentException(getter_AddRefs(ex));
647	if (NS_SUCCEEDED(rc) && ex)
648	{
649	nsCOMPtr<IVirtualBoxErrorInfo> info;
650	info = do_QueryInterface(ex, &rc);
651	if (NS_SUCCEEDED(rc) && info)
652	{
653	/* got extended error info */
654	printf("Extended error info (IVirtualBoxErrorInfo):\n");
655	PRInt32 resultCode = NS_OK;
656	info->GetResultCode(&resultCode);
657	printf(" resultCode=%08X\n", resultCode);
658	nsXPIDLString component;
659	info->GetComponent(getter_Copies(component));
660	printf(" component=%s\n", NS_ConvertUTF16toUTF8(component).get());
661	nsXPIDLString text;
662	info->GetText(getter_Copies(text));
663	printf(" text=%s\n", NS_ConvertUTF16toUTF8(text).get());
664	}
665	else
666	{
667	/* got basic error info */
668	printf("Basic error info (nsIException):\n");
669	nsresult resultCode = NS_OK;
670	ex->GetResult(&resultCode);
671	printf(" resultCode=%08X\n", resultCode);
672	nsXPIDLCString message;
673	ex->GetMessage(getter_Copies(message));
674	printf(" message=%s\n", message.get());
675	}
676
677	/* reset the exception to NULL to indicate we've processed it */
678	em->SetCurrentException(NULL);
679
680	rc = NS_OK;
681	}
682	}
683	}
684	}

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source: vbox/trunk/src/VBox/Main/testcase/tstVBoxAPIXPCOM.cpp@ 98103

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