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comparison: modules/libpref/src/nsPrefBranch.cpp

modules/libpref/src/nsPrefBranch.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "mozilla/dom/ContentChild.h"
7 #include "nsXULAppAPI.h"
8
9 #include "nsPrefBranch.h"
10 #include "nsILocalFile.h" // nsILocalFile used for backwards compatibility
11 #include "nsIObserverService.h"
12 #include "nsXPCOM.h"
13 #include "nsISupportsPrimitives.h"
14 #include "nsIDirectoryService.h"
15 #include "nsString.h"
16 #include "nsReadableUtils.h"
17 #include "nsXPIDLString.h"
18 #include "nsPrintfCString.h"
19 #include "nsIStringBundle.h"
20 #include "prefapi.h"
21 #include "pldhash.h"
22
23 #include "nsCRT.h"
24 #include "mozilla/Services.h"
25
26 #include "prefapi_private_data.h"
27
28 #ifdef MOZ_CRASHREPORTER
29 #include "nsICrashReporter.h"
30 #endif
31
32 #include "nsIConsoleService.h"
33
34 #ifdef DEBUG
35 #define ENSURE_MAIN_PROCESS(message, pref) do { \
36 if (GetContentChild()) { \
37 nsPrintfCString msg("ENSURE_MAIN_PROCESS failed. %s %s", message, pref); \
38 NS_ERROR(msg.get()); \
39 return NS_ERROR_NOT_AVAILABLE; \
40 } \
41 } while (0);
42 #else
43 #define ENSURE_MAIN_PROCESS(message, pref) \
44 if (GetContentChild()) { \
45 return NS_ERROR_NOT_AVAILABLE; \
46 }
47 #endif
48
49 // Definitions
50 struct EnumerateData {
51 const char *parent;
52 nsTArray<nsCString> *pref_list;
53 };
54
55 // Prototypes
56 static PLDHashOperator
57 pref_enumChild(PLDHashTable *table, PLDHashEntryHdr *heh,
58 uint32_t i, void *arg);
59
60 using mozilla::dom::ContentChild;
61
62 static ContentChild*
63 GetContentChild()
64 {
65 if (XRE_GetProcessType() == GeckoProcessType_Content) {
66 ContentChild* cpc = ContentChild::GetSingleton();
67 if (!cpc) {
68 NS_RUNTIMEABORT("Content Protocol is NULL! We're going to crash!");
69 }
70 return cpc;
71 }
72 return nullptr;
73 }
74
75 /*
76 * Constructor/Destructor
77 */
78
79 nsPrefBranch::nsPrefBranch(const char *aPrefRoot, bool aDefaultBranch)
80 {
81 mPrefRoot = aPrefRoot;
82 mPrefRootLength = mPrefRoot.Length();
83 mIsDefault = aDefaultBranch;
84 mFreeingObserverList = false;
85
86 nsCOMPtr<nsIObserverService> observerService =
87 mozilla::services::GetObserverService();
88 if (observerService) {
89 ++mRefCnt; // Our refcnt must be > 0 when we call this, or we'll get deleted!
90 // add weak so we don't have to clean up at shutdown
91 observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
92 --mRefCnt;
93 }
94 }
95
96 nsPrefBranch::~nsPrefBranch()
97 {
98 freeObserverList();
99
100 nsCOMPtr<nsIObserverService> observerService =
101 mozilla::services::GetObserverService();
102 if (observerService)
103 observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
104 }
105
106
107 /*
108 * nsISupports Implementation
109 */
110
111 NS_IMPL_ADDREF(nsPrefBranch)
112 NS_IMPL_RELEASE(nsPrefBranch)
113
114 NS_INTERFACE_MAP_BEGIN(nsPrefBranch)
115 NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIPrefBranch)
116 NS_INTERFACE_MAP_ENTRY(nsIPrefBranch)
117 NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIPrefBranch2, !mIsDefault)
118 NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIPrefBranchInternal, !mIsDefault)
119 NS_INTERFACE_MAP_ENTRY(nsIObserver)
120 NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
121 NS_INTERFACE_MAP_END
122
123
124 /*
125 * nsIPrefBranch Implementation
126 */
127
128 NS_IMETHODIMP nsPrefBranch::GetRoot(char **aRoot)
129 {
130 NS_ENSURE_ARG_POINTER(aRoot);
131 mPrefRoot.Truncate(mPrefRootLength);
132 *aRoot = ToNewCString(mPrefRoot);
133 return NS_OK;
134 }
135
136 NS_IMETHODIMP nsPrefBranch::GetPrefType(const char *aPrefName, int32_t *_retval)
137 {
138 NS_ENSURE_ARG(aPrefName);
139 const char *pref = getPrefName(aPrefName);
140 *_retval = PREF_GetPrefType(pref);
141 return NS_OK;
142 }
143
144 NS_IMETHODIMP nsPrefBranch::GetBoolPref(const char *aPrefName, bool *_retval)
145 {
146 NS_ENSURE_ARG(aPrefName);
147 const char *pref = getPrefName(aPrefName);
148 return PREF_GetBoolPref(pref, _retval, mIsDefault);
149 }
150
151 NS_IMETHODIMP nsPrefBranch::SetBoolPref(const char *aPrefName, bool aValue)
152 {
153 ENSURE_MAIN_PROCESS("Cannot SetBoolPref from content process:", aPrefName);
154 NS_ENSURE_ARG(aPrefName);
155 const char *pref = getPrefName(aPrefName);
156 return PREF_SetBoolPref(pref, aValue, mIsDefault);
157 }
158
159 NS_IMETHODIMP nsPrefBranch::GetFloatPref(const char *aPrefName, float *_retval)
160 {
161 NS_ENSURE_ARG(aPrefName);
162 const char *pref = getPrefName(aPrefName);
163 nsAutoCString stringVal;
164 nsresult rv = GetCharPref(pref, getter_Copies(stringVal));
165 if (NS_SUCCEEDED(rv)) {
166 *_retval = stringVal.ToFloat(&rv);
167 }
168
169 return rv;
170 }
171
172 NS_IMETHODIMP nsPrefBranch::GetCharPref(const char *aPrefName, char **_retval)
173 {
174 NS_ENSURE_ARG(aPrefName);
175 const char *pref = getPrefName(aPrefName);
176 return PREF_CopyCharPref(pref, _retval, mIsDefault);
177 }
178
179 NS_IMETHODIMP nsPrefBranch::SetCharPref(const char *aPrefName, const char *aValue)
180 {
181 nsresult rv = CheckSanityOfStringLength(aPrefName, aValue);
182 if (NS_FAILED(rv)) {
183 return rv;
184 }
185 return SetCharPrefInternal(aPrefName, aValue);
186 }
187
188 nsresult nsPrefBranch::SetCharPrefInternal(const char *aPrefName, const char *aValue)
189
190 {
191 ENSURE_MAIN_PROCESS("Cannot SetCharPref from content process:", aPrefName);
192 NS_ENSURE_ARG(aPrefName);
193 NS_ENSURE_ARG(aValue);
194 const char *pref = getPrefName(aPrefName);
195 return PREF_SetCharPref(pref, aValue, mIsDefault);
196 }
197
198 NS_IMETHODIMP nsPrefBranch::GetIntPref(const char *aPrefName, int32_t *_retval)
199 {
200 NS_ENSURE_ARG(aPrefName);
201 const char *pref = getPrefName(aPrefName);
202 return PREF_GetIntPref(pref, _retval, mIsDefault);
203 }
204
205 NS_IMETHODIMP nsPrefBranch::SetIntPref(const char *aPrefName, int32_t aValue)
206 {
207 ENSURE_MAIN_PROCESS("Cannot SetIntPref from content process:", aPrefName);
208 NS_ENSURE_ARG(aPrefName);
209 const char *pref = getPrefName(aPrefName);
210 return PREF_SetIntPref(pref, aValue, mIsDefault);
211 }
212
213 NS_IMETHODIMP nsPrefBranch::GetComplexValue(const char *aPrefName, const nsIID & aType, void **_retval)
214 {
215 NS_ENSURE_ARG(aPrefName);
216
217 nsresult rv;
218 nsXPIDLCString utf8String;
219
220 // we have to do this one first because it's different than all the rest
221 if (aType.Equals(NS_GET_IID(nsIPrefLocalizedString))) {
222 nsCOMPtr<nsIPrefLocalizedString> theString(do_CreateInstance(NS_PREFLOCALIZEDSTRING_CONTRACTID, &rv));
223 if (NS_FAILED(rv)) return rv;
224
225 const char *pref = getPrefName(aPrefName);
226 bool bNeedDefault = false;
227
228 if (mIsDefault) {
229 bNeedDefault = true;
230 } else {
231 // if there is no user (or locked) value
232 if (!PREF_HasUserPref(pref) && !PREF_PrefIsLocked(pref)) {
233 bNeedDefault = true;
234 }
235 }
236
237 // if we need to fetch the default value, do that instead, otherwise use the
238 // value we pulled in at the top of this function
239 if (bNeedDefault) {
240 nsXPIDLString utf16String;
241 rv = GetDefaultFromPropertiesFile(pref, getter_Copies(utf16String));
242 if (NS_SUCCEEDED(rv)) {
243 theString->SetData(utf16String.get());
244 }
245 } else {
246 rv = GetCharPref(aPrefName, getter_Copies(utf8String));
247 if (NS_SUCCEEDED(rv)) {
248 theString->SetData(NS_ConvertUTF8toUTF16(utf8String).get());
249 }
250 }
251
252 if (NS_SUCCEEDED(rv)) {
253 theString.forget(reinterpret_cast<nsIPrefLocalizedString**>(_retval));
254 }
255
256 return rv;
257 }
258
259 // if we can't get the pref, there's no point in being here
260 rv = GetCharPref(aPrefName, getter_Copies(utf8String));
261 if (NS_FAILED(rv)) {
262 return rv;
263 }
264
265 // also check nsILocalFile, for backwards compatibility
266 if (aType.Equals(NS_GET_IID(nsIFile)) || aType.Equals(NS_GET_IID(nsILocalFile))) {
267 if (GetContentChild()) {
268 NS_ERROR("cannot get nsIFile pref from content process");
269 return NS_ERROR_NOT_AVAILABLE;
270 }
271
272 nsCOMPtr<nsIFile> file(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
273
274 if (NS_SUCCEEDED(rv)) {
275 rv = file->SetPersistentDescriptor(utf8String);
276 if (NS_SUCCEEDED(rv)) {
277 file.forget(reinterpret_cast<nsIFile**>(_retval));
278 return NS_OK;
279 }
280 }
281 return rv;
282 }
283
284 if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
285 if (GetContentChild()) {
286 NS_ERROR("cannot get nsIRelativeFilePref from content process");
287 return NS_ERROR_NOT_AVAILABLE;
288 }
289
290 nsACString::const_iterator keyBegin, strEnd;
291 utf8String.BeginReading(keyBegin);
292 utf8String.EndReading(strEnd);
293
294 // The pref has the format: [fromKey]a/b/c
295 if (*keyBegin++ != '[')
296 return NS_ERROR_FAILURE;
297 nsACString::const_iterator keyEnd(keyBegin);
298 if (!FindCharInReadable(']', keyEnd, strEnd))
299 return NS_ERROR_FAILURE;
300 nsAutoCString key(Substring(keyBegin, keyEnd));
301
302 nsCOMPtr<nsIFile> fromFile;
303 nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
304 if (NS_FAILED(rv))
305 return rv;
306 rv = directoryService->Get(key.get(), NS_GET_IID(nsIFile), getter_AddRefs(fromFile));
307 if (NS_FAILED(rv))
308 return rv;
309
310 nsCOMPtr<nsIFile> theFile;
311 rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(theFile));
312 if (NS_FAILED(rv))
313 return rv;
314 rv = theFile->SetRelativeDescriptor(fromFile, Substring(++keyEnd, strEnd));
315 if (NS_FAILED(rv))
316 return rv;
317 nsCOMPtr<nsIRelativeFilePref> relativePref;
318 rv = NS_NewRelativeFilePref(theFile, key, getter_AddRefs(relativePref));
319 if (NS_FAILED(rv))
320 return rv;
321
322 relativePref.forget(reinterpret_cast<nsIRelativeFilePref**>(_retval));
323 return NS_OK;
324 }
325
326 if (aType.Equals(NS_GET_IID(nsISupportsString))) {
327 nsCOMPtr<nsISupportsString> theString(do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv));
328
329 if (NS_SUCCEEDED(rv)) {
330 // Debugging to see why we end up with very long strings here with
331 // some addons, see bug 836263.
332 nsAutoString wdata;
333 if (!AppendUTF8toUTF16(utf8String, wdata, mozilla::fallible_t())) {
334 #ifdef MOZ_CRASHREPORTER
335 nsCOMPtr<nsICrashReporter> cr =
336 do_GetService("@mozilla.org/toolkit/crash-reporter;1");
337 if (cr) {
338 cr->AnnotateCrashReport(NS_LITERAL_CSTRING("bug836263-size"),
339 nsPrintfCString("%x", utf8String.Length()));
340 cr->RegisterAppMemory(uint64_t(utf8String.BeginReading()),
341 std::min(0x1000U, utf8String.Length()));
342 }
343 #endif
344 NS_RUNTIMEABORT("bug836263");
345 }
346 theString->SetData(wdata);
347 theString.forget(reinterpret_cast<nsISupportsString**>(_retval));
348 }
349 return rv;
350 }
351
352 NS_WARNING("nsPrefBranch::GetComplexValue - Unsupported interface type");
353 return NS_NOINTERFACE;
354 }
355
356 nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const char* aValue) {
357 if (!aValue) {
358 return NS_OK;
359 }
360 return CheckSanityOfStringLength(aPrefName, strlen(aValue));
361 }
362
363 nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const nsAString& aValue) {
364 return CheckSanityOfStringLength(aPrefName, aValue.Length());
365 }
366
367 nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const uint32_t aLength) {
368 if (aLength > MAX_PREF_LENGTH) {
369 return NS_ERROR_ILLEGAL_VALUE;
370 }
371 if (aLength <= MAX_ADVISABLE_PREF_LENGTH) {
372 return NS_OK;
373 }
374 nsresult rv;
375 nsCOMPtr<nsIConsoleService> console = do_GetService("@mozilla.org/consoleservice;1", &rv);
376 if (NS_FAILED(rv)) {
377 return rv;
378 }
379 nsAutoCString message(nsPrintfCString("Warning: attempting to write %d bytes to preference %s. This is bad for general performance and memory usage. Such an amount of data should rather be written to an external file.",
380 aLength,
381 aPrefName));
382 rv = console->LogStringMessage(NS_ConvertUTF8toUTF16(message).get());
383 if (NS_FAILED(rv)) {
384 return rv;
385 }
386 return NS_OK;
387 }
388
389
390 NS_IMETHODIMP nsPrefBranch::SetComplexValue(const char *aPrefName, const nsIID & aType, nsISupports *aValue)
391 {
392 ENSURE_MAIN_PROCESS("Cannot SetComplexValue from content process:", aPrefName);
393 NS_ENSURE_ARG(aPrefName);
394
395 nsresult rv = NS_NOINTERFACE;
396
397 // also check nsILocalFile, for backwards compatibility
398 if (aType.Equals(NS_GET_IID(nsIFile)) || aType.Equals(NS_GET_IID(nsILocalFile))) {
399 nsCOMPtr<nsIFile> file = do_QueryInterface(aValue);
400 if (!file)
401 return NS_NOINTERFACE;
402 nsAutoCString descriptorString;
403
404 rv = file->GetPersistentDescriptor(descriptorString);
405 if (NS_SUCCEEDED(rv)) {
406 rv = SetCharPrefInternal(aPrefName, descriptorString.get());
407 }
408 return rv;
409 }
410
411 if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
412 nsCOMPtr<nsIRelativeFilePref> relFilePref = do_QueryInterface(aValue);
413 if (!relFilePref)
414 return NS_NOINTERFACE;
415
416 nsCOMPtr<nsIFile> file;
417 relFilePref->GetFile(getter_AddRefs(file));
418 if (!file)
419 return NS_NOINTERFACE;
420 nsAutoCString relativeToKey;
421 (void) relFilePref->GetRelativeToKey(relativeToKey);
422
423 nsCOMPtr<nsIFile> relativeToFile;
424 nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
425 if (NS_FAILED(rv))
426 return rv;
427 rv = directoryService->Get(relativeToKey.get(), NS_GET_IID(nsIFile), getter_AddRefs(relativeToFile));
428 if (NS_FAILED(rv))
429 return rv;
430
431 nsAutoCString relDescriptor;
432 rv = file->GetRelativeDescriptor(relativeToFile, relDescriptor);
433 if (NS_FAILED(rv))
434 return rv;
435
436 nsAutoCString descriptorString;
437 descriptorString.Append('[');
438 descriptorString.Append(relativeToKey);
439 descriptorString.Append(']');
440 descriptorString.Append(relDescriptor);
441 return SetCharPrefInternal(aPrefName, descriptorString.get());
442 }
443
444 if (aType.Equals(NS_GET_IID(nsISupportsString))) {
445 nsCOMPtr<nsISupportsString> theString = do_QueryInterface(aValue);
446
447 if (theString) {
448 nsString wideString;
449
450 rv = theString->GetData(wideString);
451 if (NS_SUCCEEDED(rv)) {
452 // Check sanity of string length before any lengthy conversion
453 rv = CheckSanityOfStringLength(aPrefName, wideString);
454 if (NS_FAILED(rv)) {
455 return rv;
456 }
457 rv = SetCharPrefInternal(aPrefName, NS_ConvertUTF16toUTF8(wideString).get());
458 }
459 }
460 return rv;
461 }
462
463 if (aType.Equals(NS_GET_IID(nsIPrefLocalizedString))) {
464 nsCOMPtr<nsIPrefLocalizedString> theString = do_QueryInterface(aValue);
465
466 if (theString) {
467 nsXPIDLString wideString;
468
469 rv = theString->GetData(getter_Copies(wideString));
470 if (NS_SUCCEEDED(rv)) {
471 // Check sanity of string length before any lengthy conversion
472 rv = CheckSanityOfStringLength(aPrefName, wideString);
473 if (NS_FAILED(rv)) {
474 return rv;
475 }
476 rv = SetCharPrefInternal(aPrefName, NS_ConvertUTF16toUTF8(wideString).get());
477 }
478 }
479 return rv;
480 }
481
482 NS_WARNING("nsPrefBranch::SetComplexValue - Unsupported interface type");
483 return NS_NOINTERFACE;
484 }
485
486 NS_IMETHODIMP nsPrefBranch::ClearUserPref(const char *aPrefName)
487 {
488 ENSURE_MAIN_PROCESS("Cannot ClearUserPref from content process:", aPrefName);
489 NS_ENSURE_ARG(aPrefName);
490 const char *pref = getPrefName(aPrefName);
491 return PREF_ClearUserPref(pref);
492 }
493
494 NS_IMETHODIMP nsPrefBranch::PrefHasUserValue(const char *aPrefName, bool *_retval)
495 {
496 NS_ENSURE_ARG_POINTER(_retval);
497 NS_ENSURE_ARG(aPrefName);
498 const char *pref = getPrefName(aPrefName);
499 *_retval = PREF_HasUserPref(pref);
500 return NS_OK;
501 }
502
503 NS_IMETHODIMP nsPrefBranch::LockPref(const char *aPrefName)
504 {
505 ENSURE_MAIN_PROCESS("Cannot LockPref from content process:", aPrefName);
506 NS_ENSURE_ARG(aPrefName);
507 const char *pref = getPrefName(aPrefName);
508 return PREF_LockPref(pref, true);
509 }
510
511 NS_IMETHODIMP nsPrefBranch::PrefIsLocked(const char *aPrefName, bool *_retval)
512 {
513 ENSURE_MAIN_PROCESS("Cannot check PrefIsLocked from content process:", aPrefName);
514 NS_ENSURE_ARG_POINTER(_retval);
515 NS_ENSURE_ARG(aPrefName);
516 const char *pref = getPrefName(aPrefName);
517 *_retval = PREF_PrefIsLocked(pref);
518 return NS_OK;
519 }
520
521 NS_IMETHODIMP nsPrefBranch::UnlockPref(const char *aPrefName)
522 {
523 ENSURE_MAIN_PROCESS("Cannot UnlockPref from content process:", aPrefName);
524 NS_ENSURE_ARG(aPrefName);
525 const char *pref = getPrefName(aPrefName);
526 return PREF_LockPref(pref, false);
527 }
528
529 /* void resetBranch (in string startingAt); */
530 NS_IMETHODIMP nsPrefBranch::ResetBranch(const char *aStartingAt)
531 {
532 return NS_ERROR_NOT_IMPLEMENTED;
533 }
534
535 NS_IMETHODIMP nsPrefBranch::DeleteBranch(const char *aStartingAt)
536 {
537 ENSURE_MAIN_PROCESS("Cannot DeleteBranch from content process:", aStartingAt);
538 NS_ENSURE_ARG(aStartingAt);
539 const char *pref = getPrefName(aStartingAt);
540 return PREF_DeleteBranch(pref);
541 }
542
543 NS_IMETHODIMP nsPrefBranch::GetChildList(const char *aStartingAt, uint32_t *aCount, char ***aChildArray)
544 {
545 char **outArray;
546 int32_t numPrefs;
547 int32_t dwIndex;
548 EnumerateData ed;
549 nsAutoTArray<nsCString, 32> prefArray;
550
551 NS_ENSURE_ARG(aStartingAt);
552 NS_ENSURE_ARG_POINTER(aCount);
553 NS_ENSURE_ARG_POINTER(aChildArray);
554
555 *aChildArray = nullptr;
556 *aCount = 0;
557
558 if (!gHashTable.ops)
559 return NS_ERROR_NOT_INITIALIZED;
560
561 // this will contain a list of all the pref name strings
562 // allocate on the stack for speed
563
564 ed.parent = getPrefName(aStartingAt);
565 ed.pref_list = &prefArray;
566 PL_DHashTableEnumerate(&gHashTable, pref_enumChild, &ed);
567
568 // now that we've built up the list, run the callback on
569 // all the matching elements
570 numPrefs = prefArray.Length();
571
572 if (numPrefs) {
573 outArray = (char **)nsMemory::Alloc(numPrefs * sizeof(char *));
574 if (!outArray)
575 return NS_ERROR_OUT_OF_MEMORY;
576
577 for (dwIndex = 0; dwIndex < numPrefs; ++dwIndex) {
578 // we need to lop off mPrefRoot in case the user is planning to pass this
579 // back to us because if they do we are going to add mPrefRoot again.
580 const nsCString& element = prefArray[dwIndex];
581 outArray[dwIndex] = (char *)nsMemory::Clone(
582 element.get() + mPrefRootLength, element.Length() - mPrefRootLength + 1);
583
584 if (!outArray[dwIndex]) {
585 // we ran out of memory... this is annoying
586 NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(dwIndex, outArray);
587 return NS_ERROR_OUT_OF_MEMORY;
588 }
589 }
590 *aChildArray = outArray;
591 }
592 *aCount = numPrefs;
593
594 return NS_OK;
595 }
596
597 NS_IMETHODIMP nsPrefBranch::AddObserver(const char *aDomain, nsIObserver *aObserver, bool aHoldWeak)
598 {
599 PrefCallback *pCallback;
600 const char *pref;
601
602 NS_ENSURE_ARG(aDomain);
603 NS_ENSURE_ARG(aObserver);
604
605 // hold a weak reference to the observer if so requested
606 if (aHoldWeak) {
607 nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(aObserver);
608 if (!weakRefFactory) {
609 // the caller didn't give us a object that supports weak reference... tell them
610 return NS_ERROR_INVALID_ARG;
611 }
612
613 // Construct a PrefCallback with a weak reference to the observer.
614 pCallback = new PrefCallback(aDomain, weakRefFactory, this);
615
616 } else {
617 // Construct a PrefCallback with a strong reference to the observer.
618 pCallback = new PrefCallback(aDomain, aObserver, this);
619 }
620
621 if (mObservers.Get(pCallback)) {
622 NS_WARNING("Ignoring duplicate observer.");
623 delete pCallback;
624 return NS_OK;
625 }
626
627 mObservers.Put(pCallback, pCallback);
628
629 // We must pass a fully qualified preference name to the callback
630 // aDomain == nullptr is the only possible failure, and we trapped it with
631 // NS_ENSURE_ARG above.
632 pref = getPrefName(aDomain);
633 PREF_RegisterCallback(pref, NotifyObserver, pCallback);
634 return NS_OK;
635 }
636
637 NS_IMETHODIMP nsPrefBranch::RemoveObserver(const char *aDomain, nsIObserver *aObserver)
638 {
639 NS_ENSURE_ARG(aDomain);
640 NS_ENSURE_ARG(aObserver);
641
642 nsresult rv = NS_OK;
643
644 // If we're in the middle of a call to freeObserverList, don't process this
645 // RemoveObserver call -- the observer in question will be removed soon, if
646 // it hasn't been already.
647 //
648 // It's important that we don't touch mObservers in any way -- even a Get()
649 // which retuns null might cause the hashtable to resize itself, which will
650 // break the Enumerator in freeObserverList.
651 if (mFreeingObserverList)
652 return NS_OK;
653
654 // Remove the relevant PrefCallback from mObservers and get an owning
655 // pointer to it. Unregister the callback first, and then let the owning
656 // pointer go out of scope and destroy the callback.
657 PrefCallback key(aDomain, aObserver, this);
658 nsAutoPtr<PrefCallback> pCallback;
659 mObservers.RemoveAndForget(&key, pCallback);
660 if (pCallback) {
661 // aDomain == nullptr is the only possible failure, trapped above
662 const char *pref = getPrefName(aDomain);
663 rv = PREF_UnregisterCallback(pref, NotifyObserver, pCallback);
664 }
665
666 return rv;
667 }
668
669 NS_IMETHODIMP nsPrefBranch::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *someData)
670 {
671 // watch for xpcom shutdown and free our observers to eliminate any cyclic references
672 if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
673 freeObserverList();
674 }
675 return NS_OK;
676 }
677
678 /* static */
679 void nsPrefBranch::NotifyObserver(const char *newpref, void *data)
680 {
681 PrefCallback *pCallback = (PrefCallback *)data;
682
683 nsCOMPtr<nsIObserver> observer = pCallback->GetObserver();
684 if (!observer) {
685 // The observer has expired. Let's remove this callback.
686 pCallback->GetPrefBranch()->RemoveExpiredCallback(pCallback);
687 return;
688 }
689
690 // remove any root this string may contain so as to not confuse the observer
691 // by passing them something other than what they passed us as a topic
692 uint32_t len = pCallback->GetPrefBranch()->GetRootLength();
693 nsAutoCString suffix(newpref + len);
694
695 observer->Observe(static_cast<nsIPrefBranch *>(pCallback->GetPrefBranch()),
696 NS_PREFBRANCH_PREFCHANGE_TOPIC_ID,
697 NS_ConvertASCIItoUTF16(suffix).get());
698 }
699
700 PLDHashOperator
701 FreeObserverFunc(PrefCallback *aKey,
702 nsAutoPtr<PrefCallback> &aCallback,
703 void *aArgs)
704 {
705 // Calling NS_RELEASE below might trigger a call to
706 // nsPrefBranch::RemoveObserver, since some classes remove themselves from
707 // the pref branch on destruction. We don't need to worry about this causing
708 // double-frees, however, because freeObserverList sets mFreeingObserverList
709 // to true, which prevents RemoveObserver calls from doing anything.
710
711 nsPrefBranch *prefBranch = aCallback->GetPrefBranch();
712 const char *pref = prefBranch->getPrefName(aCallback->GetDomain().get());
713 PREF_UnregisterCallback(pref, nsPrefBranch::NotifyObserver, aCallback);
714
715 return PL_DHASH_REMOVE;
716 }
717
718 void nsPrefBranch::freeObserverList(void)
719 {
720 // We need to prevent anyone from modifying mObservers while we're
721 // enumerating over it. In particular, some clients will call
722 // RemoveObserver() when they're destructed; we need to keep those calls from
723 // touching mObservers.
724 mFreeingObserverList = true;
725 mObservers.Enumerate(&FreeObserverFunc, nullptr);
726 mFreeingObserverList = false;
727 }
728
729 void
730 nsPrefBranch::RemoveExpiredCallback(PrefCallback *aCallback)
731 {
732 NS_PRECONDITION(aCallback->IsExpired(), "Callback should be expired.");
733 mObservers.Remove(aCallback);
734 }
735
736 nsresult nsPrefBranch::GetDefaultFromPropertiesFile(const char *aPrefName, char16_t **return_buf)
737 {
738 nsresult rv;
739
740 // the default value contains a URL to a .properties file
741
742 nsXPIDLCString propertyFileURL;
743 rv = PREF_CopyCharPref(aPrefName, getter_Copies(propertyFileURL), true);
744 if (NS_FAILED(rv))
745 return rv;
746
747 nsCOMPtr<nsIStringBundleService> bundleService =
748 mozilla::services::GetStringBundleService();
749 if (!bundleService)
750 return NS_ERROR_FAILURE;
751
752 nsCOMPtr<nsIStringBundle> bundle;
753 rv = bundleService->CreateBundle(propertyFileURL,
754 getter_AddRefs(bundle));
755 if (NS_FAILED(rv))
756 return rv;
757
758 // string names are in unicode
759 nsAutoString stringId;
760 stringId.AssignASCII(aPrefName);
761
762 return bundle->GetStringFromName(stringId.get(), return_buf);
763 }
764
765 const char *nsPrefBranch::getPrefName(const char *aPrefName)
766 {
767 NS_ASSERTION(aPrefName, "null pref name!");
768
769 // for speed, avoid strcpy if we can:
770 if (mPrefRoot.IsEmpty())
771 return aPrefName;
772
773 // isn't there a better way to do this? this is really kind of gross.
774 mPrefRoot.Truncate(mPrefRootLength);
775 mPrefRoot.Append(aPrefName);
776 return mPrefRoot.get();
777 }
778
779 static PLDHashOperator
780 pref_enumChild(PLDHashTable *table, PLDHashEntryHdr *heh,
781 uint32_t i, void *arg)
782 {
783 PrefHashEntry *he = static_cast<PrefHashEntry*>(heh);
784 EnumerateData *d = reinterpret_cast<EnumerateData *>(arg);
785 if (strncmp(he->key, d->parent, strlen(d->parent)) == 0) {
786 d->pref_list->AppendElement(he->key);
787 }
788 return PL_DHASH_NEXT;
789 }
790
791 //----------------------------------------------------------------------------
792 // nsPrefLocalizedString
793 //----------------------------------------------------------------------------
794
795 nsPrefLocalizedString::nsPrefLocalizedString()
796 {
797 }
798
799 nsPrefLocalizedString::~nsPrefLocalizedString()
800 {
801 }
802
803
804 /*
805 * nsISupports Implementation
806 */
807
808 NS_IMPL_ADDREF(nsPrefLocalizedString)
809 NS_IMPL_RELEASE(nsPrefLocalizedString)
810
811 NS_INTERFACE_MAP_BEGIN(nsPrefLocalizedString)
812 NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIPrefLocalizedString)
813 NS_INTERFACE_MAP_ENTRY(nsIPrefLocalizedString)
814 NS_INTERFACE_MAP_ENTRY(nsISupportsString)
815 NS_INTERFACE_MAP_END
816
817 nsresult nsPrefLocalizedString::Init()
818 {
819 nsresult rv;
820 mUnicodeString = do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
821
822 return rv;
823 }
824
825 NS_IMETHODIMP
826 nsPrefLocalizedString::GetData(char16_t **_retval)
827 {
828 nsAutoString data;
829
830 nsresult rv = GetData(data);
831 if (NS_FAILED(rv))
832 return rv;
833
834 *_retval = ToNewUnicode(data);
835 if (!*_retval)
836 return NS_ERROR_OUT_OF_MEMORY;
837
838 return NS_OK;
839 }
840
841 NS_IMETHODIMP
842 nsPrefLocalizedString::SetData(const char16_t *aData)
843 {
844 if (!aData)
845 return SetData(EmptyString());
846 return SetData(nsDependentString(aData));
847 }
848
849 NS_IMETHODIMP
850 nsPrefLocalizedString::SetDataWithLength(uint32_t aLength,
851 const char16_t *aData)
852 {
853 if (!aData)
854 return SetData(EmptyString());
855 return SetData(Substring(aData, aLength));
856 }
857
858 //----------------------------------------------------------------------------
859 // nsRelativeFilePref
860 //----------------------------------------------------------------------------
861
862 NS_IMPL_ISUPPORTS(nsRelativeFilePref, nsIRelativeFilePref)
863
864 nsRelativeFilePref::nsRelativeFilePref()
865 {
866 }
867
868 nsRelativeFilePref::~nsRelativeFilePref()
869 {
870 }
871
872 NS_IMETHODIMP nsRelativeFilePref::GetFile(nsIFile **aFile)
873 {
874 NS_ENSURE_ARG_POINTER(aFile);
875 *aFile = mFile;
876 NS_IF_ADDREF(*aFile);
877 return NS_OK;
878 }
879
880 NS_IMETHODIMP nsRelativeFilePref::SetFile(nsIFile *aFile)
881 {
882 mFile = aFile;
883 return NS_OK;
884 }
885
886 NS_IMETHODIMP nsRelativeFilePref::GetRelativeToKey(nsACString& aRelativeToKey)
887 {
888 aRelativeToKey.Assign(mRelativeToKey);
889 return NS_OK;
890 }
891
892 NS_IMETHODIMP nsRelativeFilePref::SetRelativeToKey(const nsACString& aRelativeToKey)
893 {
894 mRelativeToKey.Assign(aRelativeToKey);
895 return NS_OK;
896 }
897
898 #undef ENSURE_MAIN_PROCESS

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