Exemple #1
0
//--------------------------------------------------------------
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;
}