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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /modules/libpref/nsPrefBranch.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'modules/libpref/nsPrefBranch.cpp')
-rw-r--r--modules/libpref/nsPrefBranch.cpp901
1 files changed, 901 insertions, 0 deletions
diff --git a/modules/libpref/nsPrefBranch.cpp b/modules/libpref/nsPrefBranch.cpp
new file mode 100644
index 000000000..2fd4992c8
--- /dev/null
+++ b/modules/libpref/nsPrefBranch.cpp
@@ -0,0 +1,901 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/ContentChild.h"
+#include "nsXULAppAPI.h"
+
+#include "nsPrefBranch.h"
+#include "nsILocalFile.h" // nsILocalFile used for backwards compatibility
+#include "nsIObserverService.h"
+#include "nsXPCOM.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIDirectoryService.h"
+#include "nsString.h"
+#include "nsReadableUtils.h"
+#include "nsXPIDLString.h"
+#include "nsPrintfCString.h"
+#include "nsIStringBundle.h"
+#include "prefapi.h"
+#include "PLDHashTable.h"
+
+#include "nsCRT.h"
+#include "mozilla/Services.h"
+
+#include "prefapi_private_data.h"
+
+#ifdef MOZ_CRASHREPORTER
+#include "nsICrashReporter.h"
+#endif
+
+#include "nsIConsoleService.h"
+
+#ifdef DEBUG
+#define ENSURE_MAIN_PROCESS(message, pref) do { \
+ if (GetContentChild()) { \
+ nsPrintfCString msg("ENSURE_MAIN_PROCESS failed. %s %s", message, pref); \
+ NS_ERROR(msg.get()); \
+ return NS_ERROR_NOT_AVAILABLE; \
+ } \
+} while (0);
+#else
+#define ENSURE_MAIN_PROCESS(message, pref) \
+ if (GetContentChild()) { \
+ return NS_ERROR_NOT_AVAILABLE; \
+ }
+#endif
+
+using mozilla::dom::ContentChild;
+
+static ContentChild*
+GetContentChild()
+{
+ if (XRE_IsContentProcess()) {
+ ContentChild* cpc = ContentChild::GetSingleton();
+ if (!cpc) {
+ NS_RUNTIMEABORT("Content Protocol is NULL! We're going to crash!");
+ }
+ return cpc;
+ }
+ return nullptr;
+}
+
+/*
+ * Constructor/Destructor
+ */
+
+nsPrefBranch::nsPrefBranch(const char *aPrefRoot, bool aDefaultBranch)
+{
+ mPrefRoot = aPrefRoot;
+ mPrefRootLength = mPrefRoot.Length();
+ mIsDefault = aDefaultBranch;
+ mFreeingObserverList = false;
+
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+ if (observerService) {
+ ++mRefCnt; // Our refcnt must be > 0 when we call this, or we'll get deleted!
+ // add weak so we don't have to clean up at shutdown
+ observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
+ --mRefCnt;
+ }
+}
+
+nsPrefBranch::~nsPrefBranch()
+{
+ freeObserverList();
+
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+ if (observerService)
+ observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
+}
+
+
+/*
+ * nsISupports Implementation
+ */
+
+NS_IMPL_ADDREF(nsPrefBranch)
+NS_IMPL_RELEASE(nsPrefBranch)
+
+NS_INTERFACE_MAP_BEGIN(nsPrefBranch)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIPrefBranch)
+ NS_INTERFACE_MAP_ENTRY(nsIPrefBranch)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIPrefBranch2, !mIsDefault)
+ NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIPrefBranchInternal, !mIsDefault)
+ NS_INTERFACE_MAP_ENTRY(nsIObserver)
+ NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+NS_INTERFACE_MAP_END
+
+
+/*
+ * nsIPrefBranch Implementation
+ */
+
+NS_IMETHODIMP nsPrefBranch::GetRoot(char **aRoot)
+{
+ NS_ENSURE_ARG_POINTER(aRoot);
+ mPrefRoot.Truncate(mPrefRootLength);
+ *aRoot = ToNewCString(mPrefRoot);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::GetPrefType(const char *aPrefName, int32_t *_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ switch (PREF_GetPrefType(pref)) {
+ case PrefType::String:
+ *_retval = PREF_STRING;
+ break;
+ case PrefType::Int:
+ *_retval = PREF_INT;
+ break;
+ case PrefType::Bool:
+ *_retval = PREF_BOOL;
+ break;
+ case PrefType::Invalid:
+ default:
+ *_retval = PREF_INVALID;
+ break;
+ }
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::GetBoolPref(const char *aPrefName, bool *_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_GetBoolPref(pref, _retval, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::SetBoolPref(const char *aPrefName, bool aValue)
+{
+ ENSURE_MAIN_PROCESS("Cannot SetBoolPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_SetBoolPref(pref, aValue, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::GetFloatPref(const char *aPrefName, float *_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ nsAutoCString stringVal;
+ nsresult rv = GetCharPref(pref, getter_Copies(stringVal));
+ if (NS_SUCCEEDED(rv)) {
+ *_retval = stringVal.ToFloat(&rv);
+ }
+
+ return rv;
+}
+
+NS_IMETHODIMP nsPrefBranch::GetCharPref(const char *aPrefName, char **_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_CopyCharPref(pref, _retval, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::SetCharPref(const char *aPrefName, const char *aValue)
+{
+ nsresult rv = CheckSanityOfStringLength(aPrefName, aValue);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ return SetCharPrefInternal(aPrefName, aValue);
+}
+
+nsresult nsPrefBranch::SetCharPrefInternal(const char *aPrefName, const char *aValue)
+
+{
+ ENSURE_MAIN_PROCESS("Cannot SetCharPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ NS_ENSURE_ARG(aValue);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_SetCharPref(pref, aValue, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::GetIntPref(const char *aPrefName, int32_t *_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_GetIntPref(pref, _retval, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::SetIntPref(const char *aPrefName, int32_t aValue)
+{
+ ENSURE_MAIN_PROCESS("Cannot SetIntPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_SetIntPref(pref, aValue, mIsDefault);
+}
+
+NS_IMETHODIMP nsPrefBranch::GetComplexValue(const char *aPrefName, const nsIID & aType, void **_retval)
+{
+ NS_ENSURE_ARG(aPrefName);
+
+ nsresult rv;
+ nsXPIDLCString utf8String;
+
+ // we have to do this one first because it's different than all the rest
+ if (aType.Equals(NS_GET_IID(nsIPrefLocalizedString))) {
+ nsCOMPtr<nsIPrefLocalizedString> theString(do_CreateInstance(NS_PREFLOCALIZEDSTRING_CONTRACTID, &rv));
+ if (NS_FAILED(rv)) return rv;
+
+ const char *pref = getPrefName(aPrefName);
+ bool bNeedDefault = false;
+
+ if (mIsDefault) {
+ bNeedDefault = true;
+ } else {
+ // if there is no user (or locked) value
+ if (!PREF_HasUserPref(pref) && !PREF_PrefIsLocked(pref)) {
+ bNeedDefault = true;
+ }
+ }
+
+ // if we need to fetch the default value, do that instead, otherwise use the
+ // value we pulled in at the top of this function
+ if (bNeedDefault) {
+ nsXPIDLString utf16String;
+ rv = GetDefaultFromPropertiesFile(pref, getter_Copies(utf16String));
+ if (NS_SUCCEEDED(rv)) {
+ theString->SetData(utf16String.get());
+ }
+ } else {
+ rv = GetCharPref(aPrefName, getter_Copies(utf8String));
+ if (NS_SUCCEEDED(rv)) {
+ theString->SetData(NS_ConvertUTF8toUTF16(utf8String).get());
+ }
+ }
+
+ if (NS_SUCCEEDED(rv)) {
+ theString.forget(reinterpret_cast<nsIPrefLocalizedString**>(_retval));
+ }
+
+ return rv;
+ }
+
+ // if we can't get the pref, there's no point in being here
+ rv = GetCharPref(aPrefName, getter_Copies(utf8String));
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // also check nsILocalFile, for backwards compatibility
+ if (aType.Equals(NS_GET_IID(nsIFile)) || aType.Equals(NS_GET_IID(nsILocalFile))) {
+ if (GetContentChild()) {
+ NS_ERROR("cannot get nsIFile pref from content process");
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsCOMPtr<nsIFile> file(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
+
+ if (NS_SUCCEEDED(rv)) {
+ rv = file->SetPersistentDescriptor(utf8String);
+ if (NS_SUCCEEDED(rv)) {
+ file.forget(reinterpret_cast<nsIFile**>(_retval));
+ return NS_OK;
+ }
+ }
+ return rv;
+ }
+
+ if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
+ if (GetContentChild()) {
+ NS_ERROR("cannot get nsIRelativeFilePref from content process");
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsACString::const_iterator keyBegin, strEnd;
+ utf8String.BeginReading(keyBegin);
+ utf8String.EndReading(strEnd);
+
+ // The pref has the format: [fromKey]a/b/c
+ if (*keyBegin++ != '[')
+ return NS_ERROR_FAILURE;
+ nsACString::const_iterator keyEnd(keyBegin);
+ if (!FindCharInReadable(']', keyEnd, strEnd))
+ return NS_ERROR_FAILURE;
+ nsAutoCString key(Substring(keyBegin, keyEnd));
+
+ nsCOMPtr<nsIFile> fromFile;
+ nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
+ if (NS_FAILED(rv))
+ return rv;
+ rv = directoryService->Get(key.get(), NS_GET_IID(nsIFile), getter_AddRefs(fromFile));
+ if (NS_FAILED(rv))
+ return rv;
+
+ nsCOMPtr<nsIFile> theFile;
+ rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(theFile));
+ if (NS_FAILED(rv))
+ return rv;
+ rv = theFile->SetRelativeDescriptor(fromFile, Substring(++keyEnd, strEnd));
+ if (NS_FAILED(rv))
+ return rv;
+ nsCOMPtr<nsIRelativeFilePref> relativePref;
+ rv = NS_NewRelativeFilePref(theFile, key, getter_AddRefs(relativePref));
+ if (NS_FAILED(rv))
+ return rv;
+
+ relativePref.forget(reinterpret_cast<nsIRelativeFilePref**>(_retval));
+ return NS_OK;
+ }
+
+ if (aType.Equals(NS_GET_IID(nsISupportsString))) {
+ nsCOMPtr<nsISupportsString> theString(do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv));
+
+ if (NS_SUCCEEDED(rv)) {
+ // Debugging to see why we end up with very long strings here with
+ // some addons, see bug 836263.
+ nsAutoString wdata;
+ if (!AppendUTF8toUTF16(utf8String, wdata, mozilla::fallible)) {
+#ifdef MOZ_CRASHREPORTER
+ nsCOMPtr<nsICrashReporter> cr =
+ do_GetService("@mozilla.org/toolkit/crash-reporter;1");
+ if (cr) {
+ cr->AnnotateCrashReport(NS_LITERAL_CSTRING("bug836263-size"),
+ nsPrintfCString("%x", utf8String.Length()));
+ cr->RegisterAppMemory(uint64_t(utf8String.BeginReading()),
+ std::min(0x1000U, utf8String.Length()));
+ }
+#endif
+ NS_RUNTIMEABORT("bug836263");
+ }
+ theString->SetData(wdata);
+ theString.forget(reinterpret_cast<nsISupportsString**>(_retval));
+ }
+ return rv;
+ }
+
+ NS_WARNING("nsPrefBranch::GetComplexValue - Unsupported interface type");
+ return NS_NOINTERFACE;
+}
+
+nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const char* aValue) {
+ if (!aValue) {
+ return NS_OK;
+ }
+ return CheckSanityOfStringLength(aPrefName, strlen(aValue));
+}
+
+nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const nsAString& aValue) {
+ return CheckSanityOfStringLength(aPrefName, aValue.Length());
+}
+
+nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const uint32_t aLength) {
+ if (aLength > MAX_PREF_LENGTH) {
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+ if (aLength <= MAX_ADVISABLE_PREF_LENGTH) {
+ return NS_OK;
+ }
+ nsresult rv;
+ nsCOMPtr<nsIConsoleService> console = do_GetService("@mozilla.org/consoleservice;1", &rv);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ 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. This preference will "
+ "not be sent to any content processes.",
+ aLength,
+ getPrefName(aPrefName)));
+ rv = console->LogStringMessage(NS_ConvertUTF8toUTF16(message).get());
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ return NS_OK;
+}
+
+/*static*/
+void nsPrefBranch::ReportToConsole(const nsAString& aMessage)
+{
+ nsresult rv;
+ nsCOMPtr<nsIConsoleService> console = do_GetService("@mozilla.org/consoleservice;1", &rv);
+ if (NS_FAILED(rv)) {
+ return;
+ }
+ nsAutoString message(aMessage);
+ console->LogStringMessage(message.get());
+}
+
+NS_IMETHODIMP nsPrefBranch::SetComplexValue(const char *aPrefName, const nsIID & aType, nsISupports *aValue)
+{
+ ENSURE_MAIN_PROCESS("Cannot SetComplexValue from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+
+ nsresult rv = NS_NOINTERFACE;
+
+ // also check nsILocalFile, for backwards compatibility
+ if (aType.Equals(NS_GET_IID(nsIFile)) || aType.Equals(NS_GET_IID(nsILocalFile))) {
+ nsCOMPtr<nsIFile> file = do_QueryInterface(aValue);
+ if (!file)
+ return NS_NOINTERFACE;
+ nsAutoCString descriptorString;
+
+ rv = file->GetPersistentDescriptor(descriptorString);
+ if (NS_SUCCEEDED(rv)) {
+ rv = SetCharPrefInternal(aPrefName, descriptorString.get());
+ }
+ return rv;
+ }
+
+ if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
+ nsCOMPtr<nsIRelativeFilePref> relFilePref = do_QueryInterface(aValue);
+ if (!relFilePref)
+ return NS_NOINTERFACE;
+
+ nsCOMPtr<nsIFile> file;
+ relFilePref->GetFile(getter_AddRefs(file));
+ if (!file)
+ return NS_NOINTERFACE;
+ nsAutoCString relativeToKey;
+ (void) relFilePref->GetRelativeToKey(relativeToKey);
+
+ nsCOMPtr<nsIFile> relativeToFile;
+ nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
+ if (NS_FAILED(rv))
+ return rv;
+ rv = directoryService->Get(relativeToKey.get(), NS_GET_IID(nsIFile), getter_AddRefs(relativeToFile));
+ if (NS_FAILED(rv))
+ return rv;
+
+ nsAutoCString relDescriptor;
+ rv = file->GetRelativeDescriptor(relativeToFile, relDescriptor);
+ if (NS_FAILED(rv))
+ return rv;
+
+ nsAutoCString descriptorString;
+ descriptorString.Append('[');
+ descriptorString.Append(relativeToKey);
+ descriptorString.Append(']');
+ descriptorString.Append(relDescriptor);
+ return SetCharPrefInternal(aPrefName, descriptorString.get());
+ }
+
+ if (aType.Equals(NS_GET_IID(nsISupportsString))) {
+ nsCOMPtr<nsISupportsString> theString = do_QueryInterface(aValue);
+
+ if (theString) {
+ nsString wideString;
+
+ rv = theString->GetData(wideString);
+ if (NS_SUCCEEDED(rv)) {
+ // Check sanity of string length before any lengthy conversion
+ rv = CheckSanityOfStringLength(aPrefName, wideString);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ rv = SetCharPrefInternal(aPrefName, NS_ConvertUTF16toUTF8(wideString).get());
+ }
+ }
+ return rv;
+ }
+
+ if (aType.Equals(NS_GET_IID(nsIPrefLocalizedString))) {
+ nsCOMPtr<nsIPrefLocalizedString> theString = do_QueryInterface(aValue);
+
+ if (theString) {
+ nsXPIDLString wideString;
+
+ rv = theString->GetData(getter_Copies(wideString));
+ if (NS_SUCCEEDED(rv)) {
+ // Check sanity of string length before any lengthy conversion
+ rv = CheckSanityOfStringLength(aPrefName, wideString);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ rv = SetCharPrefInternal(aPrefName, NS_ConvertUTF16toUTF8(wideString).get());
+ }
+ }
+ return rv;
+ }
+
+ NS_WARNING("nsPrefBranch::SetComplexValue - Unsupported interface type");
+ return NS_NOINTERFACE;
+}
+
+NS_IMETHODIMP nsPrefBranch::ClearUserPref(const char *aPrefName)
+{
+ ENSURE_MAIN_PROCESS("Cannot ClearUserPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_ClearUserPref(pref);
+}
+
+NS_IMETHODIMP nsPrefBranch::PrefHasUserValue(const char *aPrefName, bool *_retval)
+{
+ NS_ENSURE_ARG_POINTER(_retval);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ *_retval = PREF_HasUserPref(pref);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::LockPref(const char *aPrefName)
+{
+ ENSURE_MAIN_PROCESS("Cannot LockPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_LockPref(pref, true);
+}
+
+NS_IMETHODIMP nsPrefBranch::PrefIsLocked(const char *aPrefName, bool *_retval)
+{
+ ENSURE_MAIN_PROCESS("Cannot check PrefIsLocked from content process:", aPrefName);
+ NS_ENSURE_ARG_POINTER(_retval);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ *_retval = PREF_PrefIsLocked(pref);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::UnlockPref(const char *aPrefName)
+{
+ ENSURE_MAIN_PROCESS("Cannot UnlockPref from content process:", aPrefName);
+ NS_ENSURE_ARG(aPrefName);
+ const char *pref = getPrefName(aPrefName);
+ return PREF_LockPref(pref, false);
+}
+
+NS_IMETHODIMP nsPrefBranch::ResetBranch(const char *aStartingAt)
+{
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsPrefBranch::DeleteBranch(const char *aStartingAt)
+{
+ ENSURE_MAIN_PROCESS("Cannot DeleteBranch from content process:", aStartingAt);
+ NS_ENSURE_ARG(aStartingAt);
+ const char *pref = getPrefName(aStartingAt);
+ return PREF_DeleteBranch(pref);
+}
+
+NS_IMETHODIMP nsPrefBranch::GetChildList(const char *aStartingAt, uint32_t *aCount, char ***aChildArray)
+{
+ char **outArray;
+ int32_t numPrefs;
+ int32_t dwIndex;
+ AutoTArray<nsCString, 32> prefArray;
+
+ NS_ENSURE_ARG(aStartingAt);
+ NS_ENSURE_ARG_POINTER(aCount);
+ NS_ENSURE_ARG_POINTER(aChildArray);
+
+ *aChildArray = nullptr;
+ *aCount = 0;
+
+ // this will contain a list of all the pref name strings
+ // allocate on the stack for speed
+
+ const char* parent = getPrefName(aStartingAt);
+ size_t parentLen = strlen(parent);
+ for (auto iter = gHashTable->Iter(); !iter.Done(); iter.Next()) {
+ auto entry = static_cast<PrefHashEntry*>(iter.Get());
+ if (strncmp(entry->key, parent, parentLen) == 0) {
+ prefArray.AppendElement(entry->key);
+ }
+ }
+
+ // now that we've built up the list, run the callback on
+ // all the matching elements
+ numPrefs = prefArray.Length();
+
+ if (numPrefs) {
+ outArray = (char **)moz_xmalloc(numPrefs * sizeof(char *));
+ if (!outArray)
+ return NS_ERROR_OUT_OF_MEMORY;
+
+ for (dwIndex = 0; dwIndex < numPrefs; ++dwIndex) {
+ // we need to lop off mPrefRoot in case the user is planning to pass this
+ // back to us because if they do we are going to add mPrefRoot again.
+ const nsCString& element = prefArray[dwIndex];
+ outArray[dwIndex] = (char *)nsMemory::Clone(
+ element.get() + mPrefRootLength, element.Length() - mPrefRootLength + 1);
+
+ if (!outArray[dwIndex]) {
+ // we ran out of memory... this is annoying
+ NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(dwIndex, outArray);
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+ *aChildArray = outArray;
+ }
+ *aCount = numPrefs;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::AddObserver(const char *aDomain, nsIObserver *aObserver, bool aHoldWeak)
+{
+ PrefCallback *pCallback;
+ const char *pref;
+
+ NS_ENSURE_ARG(aDomain);
+ NS_ENSURE_ARG(aObserver);
+
+ // hold a weak reference to the observer if so requested
+ if (aHoldWeak) {
+ nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(aObserver);
+ if (!weakRefFactory) {
+ // the caller didn't give us a object that supports weak reference... tell them
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // Construct a PrefCallback with a weak reference to the observer.
+ pCallback = new PrefCallback(aDomain, weakRefFactory, this);
+
+ } else {
+ // Construct a PrefCallback with a strong reference to the observer.
+ pCallback = new PrefCallback(aDomain, aObserver, this);
+ }
+
+ if (mObservers.Get(pCallback)) {
+ NS_WARNING("Ignoring duplicate observer.");
+ delete pCallback;
+ return NS_OK;
+ }
+
+ mObservers.Put(pCallback, pCallback);
+
+ // We must pass a fully qualified preference name to the callback
+ // aDomain == nullptr is the only possible failure, and we trapped it with
+ // NS_ENSURE_ARG above.
+ pref = getPrefName(aDomain);
+ PREF_RegisterCallback(pref, NotifyObserver, pCallback);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsPrefBranch::RemoveObserver(const char *aDomain, nsIObserver *aObserver)
+{
+ NS_ENSURE_ARG(aDomain);
+ NS_ENSURE_ARG(aObserver);
+
+ nsresult rv = NS_OK;
+
+ // If we're in the middle of a call to freeObserverList, don't process this
+ // RemoveObserver call -- the observer in question will be removed soon, if
+ // it hasn't been already.
+ //
+ // It's important that we don't touch mObservers in any way -- even a Get()
+ // which returns null might cause the hashtable to resize itself, which will
+ // break the iteration in freeObserverList.
+ if (mFreeingObserverList)
+ return NS_OK;
+
+ // Remove the relevant PrefCallback from mObservers and get an owning
+ // pointer to it. Unregister the callback first, and then let the owning
+ // pointer go out of scope and destroy the callback.
+ PrefCallback key(aDomain, aObserver, this);
+ nsAutoPtr<PrefCallback> pCallback;
+ mObservers.RemoveAndForget(&key, pCallback);
+ if (pCallback) {
+ // aDomain == nullptr is the only possible failure, trapped above
+ const char *pref = getPrefName(aDomain);
+ rv = PREF_UnregisterCallback(pref, NotifyObserver, pCallback);
+ }
+
+ return rv;
+}
+
+NS_IMETHODIMP nsPrefBranch::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *someData)
+{
+ // watch for xpcom shutdown and free our observers to eliminate any cyclic references
+ if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
+ freeObserverList();
+ }
+ return NS_OK;
+}
+
+/* static */
+void nsPrefBranch::NotifyObserver(const char *newpref, void *data)
+{
+ PrefCallback *pCallback = (PrefCallback *)data;
+
+ nsCOMPtr<nsIObserver> observer = pCallback->GetObserver();
+ if (!observer) {
+ // The observer has expired. Let's remove this callback.
+ pCallback->GetPrefBranch()->RemoveExpiredCallback(pCallback);
+ return;
+ }
+
+ // remove any root this string may contain so as to not confuse the observer
+ // by passing them something other than what they passed us as a topic
+ uint32_t len = pCallback->GetPrefBranch()->GetRootLength();
+ nsAutoCString suffix(newpref + len);
+
+ observer->Observe(static_cast<nsIPrefBranch *>(pCallback->GetPrefBranch()),
+ NS_PREFBRANCH_PREFCHANGE_TOPIC_ID,
+ NS_ConvertASCIItoUTF16(suffix).get());
+}
+
+size_t
+nsPrefBranch::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
+{
+ size_t n = aMallocSizeOf(this);
+ n += mPrefRoot.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+ n += mObservers.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ return n;
+}
+
+void nsPrefBranch::freeObserverList(void)
+{
+ // We need to prevent anyone from modifying mObservers while we're iterating
+ // over it. In particular, some clients will call RemoveObserver() when
+ // they're removed and destructed via the iterator; we set
+ // mFreeingObserverList to keep those calls from touching mObservers.
+ mFreeingObserverList = true;
+ for (auto iter = mObservers.Iter(); !iter.Done(); iter.Next()) {
+ nsAutoPtr<PrefCallback>& callback = iter.Data();
+ nsPrefBranch *prefBranch = callback->GetPrefBranch();
+ const char *pref = prefBranch->getPrefName(callback->GetDomain().get());
+ PREF_UnregisterCallback(pref, nsPrefBranch::NotifyObserver, callback);
+ iter.Remove();
+ }
+ mFreeingObserverList = false;
+}
+
+void
+nsPrefBranch::RemoveExpiredCallback(PrefCallback *aCallback)
+{
+ NS_PRECONDITION(aCallback->IsExpired(), "Callback should be expired.");
+ mObservers.Remove(aCallback);
+}
+
+nsresult nsPrefBranch::GetDefaultFromPropertiesFile(const char *aPrefName, char16_t **return_buf)
+{
+ nsresult rv;
+
+ // the default value contains a URL to a .properties file
+
+ nsXPIDLCString propertyFileURL;
+ rv = PREF_CopyCharPref(aPrefName, getter_Copies(propertyFileURL), true);
+ if (NS_FAILED(rv))
+ return rv;
+
+ nsCOMPtr<nsIStringBundleService> bundleService =
+ mozilla::services::GetStringBundleService();
+ if (!bundleService)
+ return NS_ERROR_FAILURE;
+
+ nsCOMPtr<nsIStringBundle> bundle;
+ rv = bundleService->CreateBundle(propertyFileURL,
+ getter_AddRefs(bundle));
+ if (NS_FAILED(rv))
+ return rv;
+
+ // string names are in unicode
+ nsAutoString stringId;
+ stringId.AssignASCII(aPrefName);
+
+ return bundle->GetStringFromName(stringId.get(), return_buf);
+}
+
+const char *nsPrefBranch::getPrefName(const char *aPrefName)
+{
+ NS_ASSERTION(aPrefName, "null pref name!");
+
+ // for speed, avoid strcpy if we can:
+ if (mPrefRoot.IsEmpty())
+ return aPrefName;
+
+ // isn't there a better way to do this? this is really kind of gross.
+ mPrefRoot.Truncate(mPrefRootLength);
+ mPrefRoot.Append(aPrefName);
+ return mPrefRoot.get();
+}
+
+//----------------------------------------------------------------------------
+// nsPrefLocalizedString
+//----------------------------------------------------------------------------
+
+nsPrefLocalizedString::nsPrefLocalizedString()
+{
+}
+
+nsPrefLocalizedString::~nsPrefLocalizedString()
+{
+}
+
+
+/*
+ * nsISupports Implementation
+ */
+
+NS_IMPL_ADDREF(nsPrefLocalizedString)
+NS_IMPL_RELEASE(nsPrefLocalizedString)
+
+NS_INTERFACE_MAP_BEGIN(nsPrefLocalizedString)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIPrefLocalizedString)
+ NS_INTERFACE_MAP_ENTRY(nsIPrefLocalizedString)
+ NS_INTERFACE_MAP_ENTRY(nsISupportsString)
+NS_INTERFACE_MAP_END
+
+nsresult nsPrefLocalizedString::Init()
+{
+ nsresult rv;
+ mUnicodeString = do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
+
+ return rv;
+}
+
+NS_IMETHODIMP
+nsPrefLocalizedString::GetData(char16_t **_retval)
+{
+ nsAutoString data;
+
+ nsresult rv = GetData(data);
+ if (NS_FAILED(rv))
+ return rv;
+
+ *_retval = ToNewUnicode(data);
+ if (!*_retval)
+ return NS_ERROR_OUT_OF_MEMORY;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrefLocalizedString::SetData(const char16_t *aData)
+{
+ if (!aData)
+ return SetData(EmptyString());
+ return SetData(nsDependentString(aData));
+}
+
+NS_IMETHODIMP
+nsPrefLocalizedString::SetDataWithLength(uint32_t aLength,
+ const char16_t *aData)
+{
+ if (!aData)
+ return SetData(EmptyString());
+ return SetData(Substring(aData, aLength));
+}
+
+//----------------------------------------------------------------------------
+// nsRelativeFilePref
+//----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(nsRelativeFilePref, nsIRelativeFilePref)
+
+nsRelativeFilePref::nsRelativeFilePref()
+{
+}
+
+nsRelativeFilePref::~nsRelativeFilePref()
+{
+}
+
+NS_IMETHODIMP nsRelativeFilePref::GetFile(nsIFile **aFile)
+{
+ NS_ENSURE_ARG_POINTER(aFile);
+ *aFile = mFile;
+ NS_IF_ADDREF(*aFile);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsRelativeFilePref::SetFile(nsIFile *aFile)
+{
+ mFile = aFile;
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsRelativeFilePref::GetRelativeToKey(nsACString& aRelativeToKey)
+{
+ aRelativeToKey.Assign(mRelativeToKey);
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsRelativeFilePref::SetRelativeToKey(const nsACString& aRelativeToKey)
+{
+ mRelativeToKey.Assign(aRelativeToKey);
+ return NS_OK;
+}
+
+#undef ENSURE_MAIN_PROCESS