1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/encoding/FallbackEncoding.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,168 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "mozilla/dom/FallbackEncoding.h"
1.9 +
1.10 +#include "mozilla/dom/EncodingUtils.h"
1.11 +#include "nsUConvPropertySearch.h"
1.12 +#include "nsIChromeRegistry.h"
1.13 +#include "mozilla/Preferences.h"
1.14 +#include "mozilla/Services.h"
1.15 +
1.16 +namespace mozilla {
1.17 +namespace dom {
1.18 +
1.19 +static const char* localesFallbacks[][3] = {
1.20 +#include "localesfallbacks.properties.h"
1.21 +};
1.22 +
1.23 +static const char* domainsFallbacks[][3] = {
1.24 +#include "domainsfallbacks.properties.h"
1.25 +};
1.26 +
1.27 +static const char* nonParticipatingDomains[][3] = {
1.28 +#include "nonparticipatingdomains.properties.h"
1.29 +};
1.30 +
1.31 +FallbackEncoding* FallbackEncoding::sInstance = nullptr;
1.32 +bool FallbackEncoding::sGuessFallbackFromTopLevelDomain = true;
1.33 +
1.34 +FallbackEncoding::FallbackEncoding()
1.35 +{
1.36 + MOZ_COUNT_CTOR(FallbackEncoding);
1.37 + MOZ_ASSERT(!FallbackEncoding::sInstance,
1.38 + "Singleton already exists.");
1.39 +}
1.40 +
1.41 +FallbackEncoding::~FallbackEncoding()
1.42 +{
1.43 + MOZ_COUNT_DTOR(FallbackEncoding);
1.44 +}
1.45 +
1.46 +void
1.47 +FallbackEncoding::Get(nsACString& aFallback)
1.48 +{
1.49 + if (!mFallback.IsEmpty()) {
1.50 + aFallback = mFallback;
1.51 + return;
1.52 + }
1.53 +
1.54 + const nsAdoptingCString& override =
1.55 + Preferences::GetCString("intl.charset.fallback.override");
1.56 + // Don't let the user break things by setting the override to unreasonable
1.57 + // values via about:config
1.58 + if (!EncodingUtils::FindEncodingForLabel(override, mFallback) ||
1.59 + !EncodingUtils::IsAsciiCompatible(mFallback) ||
1.60 + mFallback.EqualsLiteral("UTF-8")) {
1.61 + mFallback.Truncate();
1.62 + }
1.63 +
1.64 + if (!mFallback.IsEmpty()) {
1.65 + aFallback = mFallback;
1.66 + return;
1.67 + }
1.68 +
1.69 + nsAutoCString locale;
1.70 + nsCOMPtr<nsIXULChromeRegistry> registry =
1.71 + mozilla::services::GetXULChromeRegistryService();
1.72 + if (registry) {
1.73 + registry->GetSelectedLocale(NS_LITERAL_CSTRING("global"), locale);
1.74 + }
1.75 +
1.76 + // Let's lower case the string just in case unofficial language packs
1.77 + // don't stick to conventions.
1.78 + ToLowerCase(locale); // ASCII lowercasing with CString input!
1.79 +
1.80 + // Special case Traditional Chinese before throwing away stuff after the
1.81 + // language itself. Today we only ship zh-TW, but be defensive about
1.82 + // possible future values.
1.83 + if (locale.EqualsLiteral("zh-tw") ||
1.84 + locale.EqualsLiteral("zh-hk") ||
1.85 + locale.EqualsLiteral("zh-mo") ||
1.86 + locale.EqualsLiteral("zh-hant")) {
1.87 + mFallback.AssignLiteral("Big5");
1.88 + aFallback = mFallback;
1.89 + return;
1.90 + }
1.91 +
1.92 + // Throw away regions and other variants to accommodate weird stuff seen
1.93 + // in telemetry--apparently unofficial language packs.
1.94 + int32_t index = locale.FindChar('-');
1.95 + if (index >= 0) {
1.96 + locale.Truncate(index);
1.97 + }
1.98 +
1.99 + if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
1.100 + localesFallbacks, ArrayLength(localesFallbacks), locale, mFallback))) {
1.101 + mFallback.AssignLiteral("windows-1252");
1.102 + }
1.103 +
1.104 + aFallback = mFallback;
1.105 +}
1.106 +
1.107 +void
1.108 +FallbackEncoding::FromLocale(nsACString& aFallback)
1.109 +{
1.110 + MOZ_ASSERT(FallbackEncoding::sInstance,
1.111 + "Using uninitialized fallback cache.");
1.112 + FallbackEncoding::sInstance->Get(aFallback);
1.113 +}
1.114 +
1.115 +// PrefChangedFunc
1.116 +void
1.117 +FallbackEncoding::PrefChanged(const char*, void*)
1.118 +{
1.119 + MOZ_ASSERT(FallbackEncoding::sInstance,
1.120 + "Pref callback called with null fallback cache.");
1.121 + FallbackEncoding::sInstance->Invalidate();
1.122 +}
1.123 +
1.124 +void
1.125 +FallbackEncoding::Initialize()
1.126 +{
1.127 + MOZ_ASSERT(!FallbackEncoding::sInstance,
1.128 + "Initializing pre-existing fallback cache.");
1.129 + FallbackEncoding::sInstance = new FallbackEncoding;
1.130 + Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
1.131 + "intl.charset.fallback.override",
1.132 + nullptr);
1.133 + Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
1.134 + "general.useragent.locale",
1.135 + nullptr);
1.136 + Preferences::AddBoolVarCache(&sGuessFallbackFromTopLevelDomain,
1.137 + "intl.charset.fallback.tld");
1.138 +}
1.139 +
1.140 +void
1.141 +FallbackEncoding::Shutdown()
1.142 +{
1.143 + MOZ_ASSERT(FallbackEncoding::sInstance,
1.144 + "Releasing non-existent fallback cache.");
1.145 + delete FallbackEncoding::sInstance;
1.146 + FallbackEncoding::sInstance = nullptr;
1.147 +}
1.148 +
1.149 +bool
1.150 +FallbackEncoding::IsParticipatingTopLevelDomain(const nsACString& aTLD)
1.151 +{
1.152 + nsAutoCString dummy;
1.153 + return NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
1.154 + nonParticipatingDomains,
1.155 + ArrayLength(nonParticipatingDomains),
1.156 + aTLD,
1.157 + dummy));
1.158 +}
1.159 +
1.160 +void
1.161 +FallbackEncoding::FromTopLevelDomain(const nsACString& aTLD,
1.162 + nsACString& aFallback)
1.163 +{
1.164 + if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
1.165 + domainsFallbacks, ArrayLength(domainsFallbacks), aTLD, aFallback))) {
1.166 + aFallback.AssignLiteral("windows-1252");
1.167 + }
1.168 +}
1.169 +
1.170 +} // namespace dom
1.171 +} // namespace mozilla
