C++ nsACString::AssignLiteral方法代码示例

NS_IMETHODIMP
HttpBaseChannel::GetContentType(nsACString& aContentType)
{
  if (!mResponseHead) {
    aContentType.Truncate();
    return NS_ERROR_NOT_AVAILABLE;
  }

  if (!mResponseHead->ContentType().IsEmpty()) {
    aContentType = mResponseHead->ContentType();
    return NS_OK;
  }

  aContentType.AssignLiteral(UNKNOWN_CONTENT_TYPE);
  return NS_OK;
}

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
nsFaviconService::GetFaviconData(nsIURI* aFaviconURI, nsACString& aMimeType,
                                 PRUint32* aDataLen, PRUint8** aData)
{
  NS_ENSURE_ARG(aFaviconURI);
  NS_ENSURE_ARG_POINTER(aDataLen);
  NS_ENSURE_ARG_POINTER(aData);

  nsCOMPtr<nsIURI> defaultFaviconURI;
  nsresult rv = GetDefaultFavicon(getter_AddRefs(defaultFaviconURI));
  NS_ENSURE_SUCCESS(rv, rv);

  PRBool isDefaultFavicon = PR_FALSE;
  rv = defaultFaviconURI->Equals(aFaviconURI, &isDefaultFavicon);
  NS_ENSURE_SUCCESS(rv, rv);

  // If we're getting the default favicon, we need to handle it separately since
  // it's not in the database.
  if (isDefaultFavicon) {
    nsCAutoString defaultData;
    rv = GetDefaultFaviconData(defaultData);
    NS_ENSURE_SUCCESS(rv, rv);

    PRUint8* bytes = reinterpret_cast<PRUint8*>(ToNewCString(defaultData));
    NS_ENSURE_STATE(bytes);

    *aData = bytes;
    *aDataLen = defaultData.Length();
    aMimeType.AssignLiteral(DEFAULT_MIME_TYPE);

    return NS_OK;
  }

  DECLARE_AND_ASSIGN_SCOPED_LAZY_STMT(stmt, mDBGetData);
  rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("icon_url"), aFaviconURI);
  NS_ENSURE_SUCCESS(rv, rv);

  PRBool hasResult = PR_FALSE;
  if (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
    rv = stmt->GetUTF8String(1, aMimeType);
    NS_ENSURE_SUCCESS(rv, rv);

    return stmt->GetBlob(0, aDataLen, aData);
  }
  return NS_ERROR_NOT_AVAILABLE;
}

static inline bool PreprocessHostname(bool              aLocalDomain,
                                      const nsACString &aInput,
                                      nsIIDNService    *aIDN,
                                      nsACString       &aACE)
{
    if (aLocalDomain) {
        aACE.AssignLiteral("localhost");
        return true;
    }

    if (!aIDN || IsASCII(aInput)) {
        aACE = aInput;
        return true;
    }

    return IsUTF8(aInput) && NS_SUCCEEDED(aIDN->ConvertUTF8toACE(aInput, aACE));
}

nsresult
nsExpandedPrincipal::GetOriginInternal(nsACString& aOrigin)
{
  aOrigin.AssignLiteral("[Expanded Principal [");
  for (size_t i = 0; i < mPrincipals.Length(); ++i) {
    if (i != 0) {
      aOrigin.AppendLiteral(", ");
    }

    nsAutoCString subOrigin;
    nsresult rv = mPrincipals.ElementAt(i)->GetOrigin(subOrigin);
    NS_ENSURE_SUCCESS(rv, rv);
    aOrigin.Append(subOrigin);
  }

  aOrigin.Append("]]");
  return NS_OK;
}

nsresult
nsPlatformCharset::ConvertLocaleToCharsetUsingDeprecatedConfig(nsAString& locale, nsACString& oResult)
{

  // locked for thread safety 
  {
    nsAutoLock guard(gLock);
    if (!gInfo_deprecated) {
      nsGREResProperties *info =
          new nsGREResProperties(NS_LITERAL_CSTRING("unixcharset.properties"));
      NS_ASSERTION(info, "cannot create nsGREResProperties");
      gInfo_deprecated = info;
    }
  }

  if (gInfo_deprecated && !(locale.IsEmpty())) {
    nsAutoString platformLocaleKey;
    // note: NS_LITERAL_STRING("locale." OSTYPE ".") does not compile on AIX
    platformLocaleKey.AssignLiteral("locale.");
    platformLocaleKey.AppendWithConversion(OSTYPE);
    platformLocaleKey.AppendLiteral(".");
    platformLocaleKey.Append(locale);

    nsAutoString charset;
    nsresult res = gInfo_deprecated->Get(platformLocaleKey, charset);
    if (NS_SUCCEEDED(res))  {
      LossyCopyUTF16toASCII(charset, oResult);
      return NS_OK;
    }
    nsAutoString localeKey;
    localeKey.AssignLiteral("locale.all.");
    localeKey.Append(locale);
    res = gInfo_deprecated->Get(localeKey, charset);
    if (NS_SUCCEEDED(res))  {
      LossyCopyUTF16toASCII(charset, oResult);
      return NS_OK;
    }
   }
   NS_ERROR("unable to convert locale to charset using deprecated config");
   mCharset.AssignLiteral("ISO-8859-1");
   oResult.AssignLiteral("ISO-8859-1");
   return NS_SUCCESS_USING_FALLBACK_LOCALE;
}

/* attribute long type; */
NS_IMETHODIMP
calRecurrenceRule::GetType(nsACString &aType)
{
    switch (mIcalRecur.freq) {
#define RECUR_HELPER(x) \
        case ICAL_##x##_RECURRENCE: aType.AssignLiteral( #x ); break
        RECUR_HELPER(SECONDLY);
        RECUR_HELPER(MINUTELY);
        RECUR_HELPER(HOURLY);
        RECUR_HELPER(DAILY);
        RECUR_HELPER(WEEKLY);
        RECUR_HELPER(MONTHLY);
        RECUR_HELPER(YEARLY);
#undef RECUR_HELPER
        default:
            aType.AssignLiteral("");
    }

    return NS_OK;
}

NS_IMETHODIMP 
nsPlatformCharset::GetDefaultCharsetForLocale(const nsAString& localeName, nsACString &oResult)
{
  nsresult rv;
  nsCOMPtr<nsIMacLocale> pMacLocale;
  pMacLocale = do_GetService(NS_MACLOCALE_CONTRACTID, &rv);
  if (NS_SUCCEEDED(rv)) {
    short script, language, region;
    rv = pMacLocale->GetPlatformLocale(localeName, &script, &language, &region);
    if (NS_SUCCEEDED(rv)) {
      if (NS_SUCCEEDED(MapToCharset(script, region, oResult))) {
        return NS_OK;
      }
    }
  }

  // fallback 
  oResult.AssignLiteral("x-mac-roman");
  return NS_SUCCESS_USING_FALLBACK_LOCALE;
}

void
MediaEngineWebRTCAudioCaptureSource::GetUUID(nsACString &aUUID) const
{
  nsID uuid;
  char uuidBuffer[NSID_LENGTH];
  nsCString asciiString;
  ErrorResult rv;

  rv = nsContentUtils::GenerateUUIDInPlace(uuid);
  if (rv.Failed()) {
    aUUID.AssignLiteral("");
    return;
  }


  uuid.ToProvidedString(uuidBuffer);
  asciiString.AssignASCII(uuidBuffer);

  // Remove {} and the null terminator
  aUUID.Assign(Substring(asciiString, 1, NSID_LENGTH - 3));
}

// nsFaviconService::OptimizeFaviconImage
//
// Given a blob of data (a image file already read into a buffer), optimize
// its size by recompressing it as a 16x16 PNG.
nsresult
nsFaviconService::OptimizeFaviconImage(const uint8_t* aData, uint32_t aDataLen,
                                       const nsACString& aMimeType,
                                       nsACString& aNewData,
                                       nsACString& aNewMimeType)
{
  nsresult rv;

  nsCOMPtr<imgITools> imgtool = do_CreateInstance("@mozilla.org/image/tools;1");

  nsCOMPtr<nsIInputStream> stream;
  rv = NS_NewByteInputStream(getter_AddRefs(stream),
                reinterpret_cast<const char*>(aData), aDataLen,
                NS_ASSIGNMENT_DEPEND);
  NS_ENSURE_SUCCESS(rv, rv);

  // decode image
  nsCOMPtr<imgIContainer> container;
  rv = imgtool->DecodeImageData(stream, aMimeType, getter_AddRefs(container));
  NS_ENSURE_SUCCESS(rv, rv);

  aNewMimeType.AssignLiteral(DEFAULT_MIME_TYPE);

  // scale and recompress
  nsCOMPtr<nsIInputStream> iconStream;
  rv = imgtool->EncodeScaledImage(container, aNewMimeType,
                                  mOptimizedIconDimension,
                                  mOptimizedIconDimension,
                                  EmptyString(),
                                  getter_AddRefs(iconStream));
  NS_ENSURE_SUCCESS(rv, rv);

  // Read the stream into a new buffer.
  rv = NS_ConsumeStream(iconStream, UINT32_MAX, aNewData);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

static void
GetSubmitCharset(nsGenericHTMLElement* aForm,
                 nsACString& oCharset)
{
  oCharset.AssignLiteral("UTF-8"); // default to utf-8

  nsAutoString acceptCharsetValue;
  aForm->GetAttr(kNameSpaceID_None, nsGkAtoms::acceptcharset,
                 acceptCharsetValue);

  PRInt32 charsetLen = acceptCharsetValue.Length();
  if (charsetLen > 0) {
    PRInt32 offset=0;
    PRInt32 spPos=0;
    // get charset from charsets one by one
    do {
      spPos = acceptCharsetValue.FindChar(PRUnichar(' '), offset);
      PRInt32 cnt = ((-1==spPos)?(charsetLen-offset):(spPos-offset));
      if (cnt > 0) {
        nsAutoString uCharset;
        acceptCharsetValue.Mid(uCharset, offset, cnt);

        if (NS_SUCCEEDED(nsCharsetAlias::GetPreferred(NS_LossyConvertUTF16toASCII(uCharset),
                                                      oCharset)))
          return;
      }
      offset = spPos + 1;
    } while (spPos != -1);
  }
  // if there are no accept-charset or all the charset are not supported
  // Get the charset from document
  nsIDocument* doc = aForm->GetDocument();
  if (doc) {
    oCharset = doc->GetDocumentCharacterSet();
  }
}

NS_IMETHODIMP nsMsgBrkMBoxStore::GetStoreType(nsACString& aType)
{
  aType.AssignLiteral("mbox");
  return NS_OK;
}

NS_IMETHODIMP nsAbLDAPDirectory::GetPropertiesChromeURI(nsACString &aResult)
{
  aResult.AssignLiteral("chrome://messenger/content/addressbook/pref-directory-add.xul");
  return NS_OK;
}

NS_IMETHODIMP nsIconChannel::GetContentType(nsACString &aContentType)
{
    aContentType.AssignLiteral(IMAGE_ICO);
    return NS_OK;
}

NS_IMETHODIMP
SimpleTimer::GetName(nsACString& aName)
{
  aName.AssignLiteral("SimpleTimer");
  return NS_OK;
}