diff --git a/mozilla/xpcom/io/nsIStringStream.cpp b/mozilla/xpcom/io/nsIStringStream.cpp
index a31b621ef41..ac7721b34b8 100644
--- a/mozilla/xpcom/io/nsIStringStream.cpp
+++ b/mozilla/xpcom/io/nsIStringStream.cpp
@@ -493,3 +493,25 @@ extern "C" NS_COM nsresult NS_NewCharIOStream(
 {
     return NS_NewCharOutputStream(aStreamResult, aStringToChange);
 }
+
+//----------------------------------------------------------------------------------------
+extern "C" NS_COM nsresult NS_NewByteInputStream(
+    nsISupports** aStreamResult,
+    const char* aStringToRead,
+     PRInt32 aLength)
+    // Factory method to get an nsInputStream from a string.  Result will implement all the
+    // file stream interfaces in nsIFileStream.h
+//----------------------------------------------------------------------------------------
+{
+    NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
+    if (! aStreamResult)
+        return NS_ERROR_NULL_POINTER;
+
+    ConstCharImpl* stream = new ConstCharImpl(aStringToRead, aLength);
+    if (! stream)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    NS_ADDREF(stream);
+    *aStreamResult = (nsISupports*)(void*)stream;
+    return NS_OK;
+}
\ No newline at end of file
diff --git a/mozilla/xpcom/io/nsIStringStream.h b/mozilla/xpcom/io/nsIStringStream.h
index 8a64eb91f68..cce458cdfe2 100644
--- a/mozilla/xpcom/io/nsIStringStream.h
+++ b/mozilla/xpcom/io/nsIStringStream.h
@@ -75,4 +75,11 @@ extern "C" NS_COM nsresult NS_NewCharIOStream(
     // Factory method to get an nsOutputStream to a string.  Result will implement all the
     // file stream interfaces in nsIFileStream.h
 
+//----------------------------------------------------------------------------------------
+extern "C" NS_COM nsresult NS_NewByteInputStream(
+    nsISupports** aStreamResult,
+    const char* aStringToRead,
+    PRInt32 aLength);
+    // Factory method to get an nsInputStream from a string.  Result will implement all the
+    // 
 #endif /* nsIStringStream_h___ */