Bug 372050 - "Expose UnescapeString through nsINetUtil". Patch by Prasad Sunkari <prasad@medhas.org>. r+sr=biesi.

netwerk/base/public/nsINetUtil.idl

@@ -44,7 +44,7 @@ interface nsIURI;
 /**
  * nsINetUtil provides various network-related utility methods.
  */
-[scriptable, uuid(c2bf4fea-7f9f-44a4-a7e0-8b323fdcc5d5)]
+[scriptable, uuid(7701f947-e4aa-431c-aec6-6bb304193460)]
 interface nsINetUtil : nsISupports
 {
   /**
@@ -73,13 +73,18 @@ interface nsINetUtil : nsISupports
 
   /** Leave alphanumeric characters and forward slashes intact,
       %XX-escape all others */
-  const unsigned long ESCAPE_URL_PATH = 3;
+  const unsigned long ESCAPE_URL_PATH = 4;
 
   /**
    * escape a string with %00-style escaping
    */
   ACString escapeString(in ACString aString, in unsigned long aEscapeType);
 
+  /**
+   * unescape a %00-style escaped string
+   */
+  ACString unescapeString(in ACString aString);
+
   /**
    * Test whether the given URI's handler has the given protocol flags.
    *

netwerk/base/src/nsIOService.cpp

@@ -945,7 +945,7 @@ nsIOService::EscapeString(const nsACString& aString,
                           PRUint32 aEscapeType,
                           nsACString& aResult)
 {
-  NS_ENSURE_ARG_RANGE(aEscapeType, 0, 3);
+  NS_ENSURE_ARG_RANGE(aEscapeType, 0, 4);
 
   nsCAutoString stringCopy(aString);
   nsCString result;
@@ -957,3 +957,18 @@ nsIOService::EscapeString(const nsACString& aString,
 
   return NS_OK;
 }
+
+NS_IMETHODIMP
+nsIOService::UnescapeString(const nsACString& aString, nsACString& aResult)
+{
+  char *str = ToNewCString(aString);
+  
+  if (!str)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  str = nsUnescape(str);
+  aResult.Assign(str);
+
+  NS_Free(str);
+  return NS_OK;
+}