C++ nsACString::IsEmpty方法代码示例

nsresult
SpdyInformation::GetNPNVersionIndex(const nsACString &npnString,
                                    uint8_t *result)
{
  if (npnString.IsEmpty())
    return NS_ERROR_FAILURE;

  if (npnString.Equals(VersionString[0]))
    *result = Version[0];
  else if (npnString.Equals(VersionString[1]))
    *result = Version[1];
  else
    return NS_ERROR_FAILURE;

  return NS_OK;
}

nsresult
SpdyInformation::GetNPNVersionIndex(const nsACString &npnString,
                                    uint8_t *result)
{
  if (npnString.IsEmpty())
    return NS_ERROR_FAILURE;

  for (uint32_t index = 0; index < kCount; ++index) {
    if (npnString.Equals(VersionString[index])) {
      *result = Version[index];
      return NS_OK;
    }
  }

  return NS_ERROR_FAILURE;
}

IndexedDatabaseManager::AsyncUsageRunnable::AsyncUsageRunnable(
                                     nsIURI* aURI,
                                     const nsACString& aOrigin,
                                     nsIIndexedDatabaseUsageCallback* aCallback)
: mURI(aURI),
  mOrigin(aOrigin),
  mCallback(aCallback),
  mUsage(0),
  mFileUsage(0),
  mCanceled(0)
{
  NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
  NS_ASSERTION(aURI, "Null pointer!");
  NS_ASSERTION(!aOrigin.IsEmpty(), "Empty origin!");
  NS_ASSERTION(aCallback, "Null pointer!");
}

nsresult
nsUrlClassifierStreamUpdater::FetchUpdate(nsIURI *aUpdateUrl,
                                          const nsACString & aRequestBody,
                                          const nsACString & aStreamTable,
                                          const nsACString & aServerMAC)
{
  nsresult rv;
  uint32_t loadFlags = nsIChannel::INHIBIT_CACHING |
                       nsIChannel::LOAD_BYPASS_CACHE;
  rv = NS_NewChannel(getter_AddRefs(mChannel), aUpdateUrl, nullptr, nullptr, this,
                     loadFlags);
  NS_ENSURE_SUCCESS(rv, rv);

  mBeganStream = false;

  // If aRequestBody is empty, construct it for the test.
  if (!aRequestBody.IsEmpty()) {
    rv = AddRequestBody(aRequestBody);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Set the appropriate content type for file/data URIs, for unit testing
  // purposes.
  // This is only used for testing and should be deleted.
  bool match;
  if ((NS_SUCCEEDED(aUpdateUrl->SchemeIs("file", &match)) && match) ||
      (NS_SUCCEEDED(aUpdateUrl->SchemeIs("data", &match)) && match)) {
    mChannel->SetContentType(NS_LITERAL_CSTRING("application/vnd.google.safebrowsing-update"));
  }

   // Create a custom LoadContext for SafeBrowsing, so we can use callbacks on
   // the channel to query the appId which allows separation of safebrowsing
   // cookies in a separate jar.
  nsCOMPtr<nsIInterfaceRequestor> sbContext =
    new mozilla::LoadContext(NECKO_SAFEBROWSING_APP_ID);
  rv = mChannel->SetNotificationCallbacks(sbContext);
  NS_ENSURE_SUCCESS(rv, rv);

  // Make the request
  rv = mChannel->AsyncOpen(this, nullptr);
  NS_ENSURE_SUCCESS(rv, rv);

  mStreamTable = aStreamTable;
  mServerMAC = aServerMAC;

  return NS_OK;
}

nsresult
nsDOMStoragePersistentDB::EnsureQuotaUsageLoaded(const nsACString& aQuotaKey)
{
  if (aQuotaKey.IsEmpty() || mQuotaUseByUncached.Get(aQuotaKey, nullptr)) {
    return NS_OK;
  } else if (mWasRemoveAllCalled || mIsRemoveAllPending) {
    mQuotaUseByUncached.Put(aQuotaKey, 0);
    return NS_OK;
  }

  Telemetry::AutoTimer<Telemetry::LOCALDOMSTORAGE_FETCH_QUOTA_USE_MS> timer;

  // Fetch information about all the scopes belonging to this site
  nsCOMPtr<mozIStorageStatement> stmt;
  stmt = mReadStatements.GetCachedStatement(
    "SELECT scope, SUM(LENGTH(key) + LENGTH(value)) "
    "FROM ( "
      "SELECT scope, key, value FROM webappsstore2 "
      "WHERE scope LIKE :quotaKey"
    ") "
    "GROUP BY scope"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scope(stmt);

  nsresult rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("quotaKey"),
                                           aQuotaKey + NS_LITERAL_CSTRING("%"));
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t uncachedSize = 0;
  bool exists;
  while (NS_SUCCEEDED(rv = stmt->ExecuteStep(&exists)) && exists) {
    nsAutoCString scopeName;
    rv = stmt->GetUTF8String(0, scopeName);
    NS_ENSURE_SUCCESS(rv, rv);

    int32_t quotaUsage;
    rv = stmt->GetInt32(1, &quotaUsage);
    NS_ENSURE_SUCCESS(rv, rv);

    if (!mCache.IsScopeCached(scopeName)) {
      uncachedSize += quotaUsage;
    }
  }
  mQuotaUseByUncached.Put(aQuotaKey, uncachedSize);
  return NS_OK;
}

void nsJAR::ReportError(const nsACString &aFilename, int16_t errorCode)
{
  //-- Generate error message
  nsAutoString message;
  message.AssignLiteral("Signature Verification Error: the signature on ");
  if (!aFilename.IsEmpty())
    AppendASCIItoUTF16(aFilename, message);
  else
    message.AppendLiteral("this .jar archive");
  message.AppendLiteral(" is invalid because ");
  switch(errorCode)
  {
  case JAR_NOT_SIGNED:
    message.AppendLiteral("the archive did not contain a valid PKCS7 signature.");
    break;
  case JAR_INVALID_SIG:
    message.AppendLiteral("the digital signature (*.RSA) file is not a valid signature of the signature instruction file (*.SF).");
    break;
  case JAR_INVALID_UNKNOWN_CA:
    message.AppendLiteral("the certificate used to sign this file has an unrecognized issuer.");
    break;
  case JAR_INVALID_MANIFEST:
    message.AppendLiteral("the signature instruction file (*.SF) does not contain a valid hash of the MANIFEST.MF file.");
    break;
  case JAR_INVALID_ENTRY:
    message.AppendLiteral("the MANIFEST.MF file does not contain a valid hash of the file being verified.");
    break;
  case JAR_NO_MANIFEST:
    message.AppendLiteral("the archive did not contain a manifest.");
    break;
  default:
    message.AppendLiteral("of an unknown problem.");
  }

  // Report error in JS console
  nsCOMPtr<nsIConsoleService> console(do_GetService("@mozilla.org/consoleservice;1"));
  if (console)
  {
    console->LogStringMessage(message.get());
  }
#ifdef DEBUG
  char* messageCstr = ToNewCString(message);
  if (!messageCstr) return;
  fprintf(stderr, "%s\n", messageCstr);
  nsMemory::Free(messageCstr);
#endif
}

bool
Throw(JSContext* aCx, nsresult aRv, const nsACString& aMessage)
{
  if (aRv == NS_ERROR_UNCATCHABLE_EXCEPTION) {
    // Nuke any existing exception on aCx, to make sure we're uncatchable.
    JS_ClearPendingException(aCx);
    return false;
  }

  if (JS_IsExceptionPending(aCx)) {
    // Don't clobber the existing exception.
    return false;
  }

  CycleCollectedJSRuntime* runtime = CycleCollectedJSRuntime::Get();
  nsCOMPtr<nsIException> existingException = runtime->GetPendingException();
  // Make sure to clear the pending exception now.  Either we're going to reuse
  // it (and we already grabbed it), or we plan to throw something else and this
  // pending exception is no longer relevant.
  runtime->SetPendingException(nullptr);

  // Ignore the pending exception if we have a non-default message passed in.
  if (aMessage.IsEmpty() && existingException) {
    nsresult nr;
    if (NS_SUCCEEDED(existingException->GetResult(&nr)) &&
        aRv == nr) {
      // Reuse the existing exception.
      if (!ThrowExceptionObject(aCx, existingException)) {
        // If we weren't able to throw an exception we're
        // most likely out of memory
        JS_ReportOutOfMemory(aCx);
      }
      return false;
    }
  }

  RefPtr<Exception> finalException = CreateException(aCx, aRv, aMessage);

  MOZ_ASSERT(finalException);
  if (!ThrowExceptionObject(aCx, finalException)) {
    // If we weren't able to throw an exception we're
    // most likely out of memory
    JS_ReportOutOfMemory(aCx);
  }

  return false;
}

SRIMetadata::SRIMetadata(const nsACString& aToken)
  : mAlgorithmType(SRIMetadata::UNKNOWN_ALGORITHM), mEmpty(false)
{
  MOZ_ASSERT(!aToken.IsEmpty()); // callers should check this first

  SRIMETADATALOG(("SRIMetadata::SRIMetadata, aToken='%s'",
                  PromiseFlatCString(aToken).get()));

  int32_t hyphen = aToken.FindChar('-');
  if (hyphen == -1) {
    SRIMETADATAERROR(("SRIMetadata::SRIMetadata, invalid (no hyphen)"));
    return; // invalid metadata
  }

  // split the token into its components
  mAlgorithm = Substring(aToken, 0, hyphen);
  uint32_t hashStart = hyphen + 1;
  if (hashStart >= aToken.Length()) {
    SRIMETADATAERROR(("SRIMetadata::SRIMetadata, invalid (missing digest)"));
    return; // invalid metadata
  }
  int32_t question = aToken.FindChar('?');
  if (question == -1) {
    mHashes.AppendElement(Substring(aToken, hashStart,
                                    aToken.Length() - hashStart));
  } else {
    MOZ_ASSERT(question > 0);
    if (static_cast<uint32_t>(question) <= hashStart) {
      SRIMETADATAERROR(("SRIMetadata::SRIMetadata, invalid (options w/o digest)"));
      return; // invalid metadata
    }
    mHashes.AppendElement(Substring(aToken, hashStart,
                                    question - hashStart));
  }

  if (mAlgorithm.EqualsLiteral("sha256")) {
    mAlgorithmType = nsICryptoHash::SHA256;
  } else if (mAlgorithm.EqualsLiteral("sha384")) {
    mAlgorithmType = nsICryptoHash::SHA384;
  } else if (mAlgorithm.EqualsLiteral("sha512")) {
    mAlgorithmType = nsICryptoHash::SHA512;
  }

  SRIMETADATALOG(("SRIMetadata::SRIMetadata, hash='%s'; alg='%s'",
                  mHashes[0].get(), mAlgorithm.get()));
}

//--------------------------------------------------------------
NS_IMETHODIMP nsCharsetAlias2::GetPreferred(const nsACString& aAlias,
                                            nsACString& oResult)
{
   if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;
   NS_TIMELINE_START_TIMER("nsCharsetAlias2:GetPreferred");


   // Delay loading charsetalias.properties by hardcoding the most
   // frequent aliases.  Note that it's possible to recur in to this
   // function *while loading* charsetalias.properties (see bug 190951),
   // so we might have an |mDelegate| already that isn't valid yet, but
   // the load is guaranteed to be "UTF-8" so things will be OK.
   for (PRUint32 index = 0; index < NS_ARRAY_LENGTH(kAliases); index++) {
     if (aAlias.LowerCaseEqualsASCII(kAliases[index][0])) {
       oResult.Assign(nsDependentCString(kAliases[index][1],
                                         NS_PTR_TO_UINT32(kAliases[index][2])));
       NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
       return NS_OK;
     }
   }

   oResult.Truncate();

   if(!mDelegate) {
     //load charsetalias.properties string bundle with all remaining aliases
     // we may need to protect the following section with a lock so we won't call the
     // 'new nsGREResProperties' from two different threads
     mDelegate = new nsGREResProperties( NS_LITERAL_CSTRING("charsetalias.properties") );
     NS_ASSERTION(mDelegate, "cannot create nsGREResProperties");
     if(nsnull == mDelegate)
       return NS_ERROR_OUT_OF_MEMORY;
   }

   NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
   NS_TIMELINE_MARK_TIMER("nsCharsetAlias2:GetPreferred");

   nsCAutoString key(aAlias);
   ToLowerCase(key);

   // hack for now, have to fix nsGREResProperties, but we can't until
   // string bundles use UTF8 keys
   nsAutoString result;
   nsresult rv = mDelegate->Get(NS_ConvertASCIItoUTF16(key), result);
   LossyAppendUTF16toASCII(result, oResult);
   return rv;
}

// static
bool
IndexedDatabaseManager::TabContextMayAccessOrigin(const TabContext& aContext,
                                                  const nsACString& aOrigin)
{
  NS_ASSERTION(!aOrigin.IsEmpty(), "Empty origin!");

  // If aContext is for a browser element, it's allowed only to access other
  // browser elements.  But if aContext is not for a browser element, it may
  // access both browser and non-browser elements.
  nsAutoCString pattern;
  QuotaManager::GetOriginPatternStringMaybeIgnoreBrowser(
                                                aContext.OwnOrContainingAppId(),
                                                aContext.IsBrowserElement(),
                                                pattern);

  return PatternMatchesOrigin(pattern, aOrigin);
}

NS_IMETHODIMP
PresentationService::SendSessionBinaryMsg(const nsAString& aSessionId,
                                          uint8_t aRole,
                                          const nsACString& aData) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!aData.IsEmpty());
  MOZ_ASSERT(!aSessionId.IsEmpty());
  MOZ_ASSERT(aRole == nsIPresentationService::ROLE_CONTROLLER ||
             aRole == nsIPresentationService::ROLE_RECEIVER);

  RefPtr<PresentationSessionInfo> info = GetSessionInfo(aSessionId, aRole);
  if (NS_WARN_IF(!info)) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  return info->SendBinaryMsg(aData);
}

nsresult nsNPAPIPluginInstance::Initialize(nsNPAPIPlugin *aPlugin, nsPluginInstanceOwner* aOwner, const nsACString& aMIMEType)
{
  PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);
  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("nsNPAPIPluginInstance::Initialize this=%p\n",this));

  NS_ENSURE_ARG_POINTER(aPlugin);
  NS_ENSURE_ARG_POINTER(aOwner);

  mPlugin = aPlugin;
  mOwner = aOwner;

  if (!aMIMEType.IsEmpty()) {
    mMIMEType = ToNewCString(aMIMEType);
  }

  return Start();
}

static nsresult
ConvertLocaleToCharsetUsingDeprecatedConfig(const nsACString& locale,
                                            nsACString& oResult)
{
  if (!(locale.IsEmpty())) {
    nsCAutoString localeKey;
    localeKey.AssignLiteral("locale.all.");
    localeKey.Append(locale);
    if (NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(kUnixCharsets,
        ArrayLength(kUnixCharsets), localeKey, oResult))) {
      return NS_OK;
    }
  }
  NS_ERROR("unable to convert locale to charset using deprecated config");
  oResult.AssignLiteral("ISO-8859-1");
  return NS_SUCCESS_USING_FALLBACK_LOCALE;
}

//--------------------------------------------------------------
NS_IMETHODIMP nsCharsetAlias2::GetPreferred(const nsACString& aAlias,
                                            nsACString& oResult)
{
   if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;

   NS_TIMELINE_START_TIMER("nsCharsetAlias2:GetPreferred");

   nsCAutoString key(aAlias);
   ToLowerCase(key);

   nsresult rv = nsUConvPropertySearch::SearchPropertyValue(kAliases,
      NS_ARRAY_LENGTH(kAliases), key, oResult);

  NS_TIMELINE_STOP_TIMER("nsCharsetAlias2:GetPreferred");
  NS_TIMELINE_MARK_TIMER("nsCharsetAlias2:GetPreferred");
  return rv;
}

NS_IMETHODIMP sbTagLibChannelFileIOManager::SetChannelRestart(
    const nsACString            &aChannelID,
    PRBool                      aRestart)
{
    sbTagLibChannelFileIOManager::Channel   *pChannel;
    nsresult                                rv;

    /* Validate parameters. */
    NS_ENSURE_FALSE(aChannelID.IsEmpty(), NS_ERROR_INVALID_ARG);

    /* Set the channel restart flag. */
    rv = GetChannel(aChannelID, &pChannel);
    NS_ENSURE_SUCCESS(rv, rv);
    pChannel->restart = aRestart;

    return (NS_OK);
}