Bug 1201468: Map UErrorCode to nsresult, r=jfkthame

intl/unicharutil/util/ICUUtils.cpp

@@ -175,6 +175,25 @@ ICUUtils::AssignUCharArrayToString(UChar* aICUString,
   NS_ASSERTION((int32_t)aMozString.Length() == aLength, "Conversion failed");
 }
 
+/* static */ nsresult
+ICUUtils::UErrorToNsResult(const UErrorCode aErrorCode)
+{
+  if (U_SUCCESS(aErrorCode)) {
+    return NS_OK;
+  }
+
+  switch(aErrorCode) {
+    case U_ILLEGAL_ARGUMENT_ERROR:
+      return NS_ERROR_INVALID_ARG;
+
+    case U_MEMORY_ALLOCATION_ERROR:
+      return NS_ERROR_OUT_OF_MEMORY;
+
+    default:
+      return NS_ERROR_FAILURE;
+  }
+}
+
 #if 0
 /* static */ Locale
 ICUUtils::BCP47CodeToLocale(const nsAString& aBCP47Code)

intl/unicharutil/util/ICUUtils.h

@@ -88,6 +88,11 @@ public:
                                        int32_t aLength,
                                        nsAString& aMozString);
 
+  /**
+   * Map ICU UErrorCode to nsresult
+   */
+  static nsresult UErrorToNsResult(const UErrorCode aErrorCode);
+
 #if 0
   // Currently disabled because using C++ API doesn't play nicely with enabling
   // system ICU.