diff -r 000000000000 -r 6474c204b198 intl/uconv/util/nsUnicodeDecodeHelper.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intl/uconv/util/nsUnicodeDecodeHelper.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsUnicodeDecodeHelper_h__
+#define nsUnicodeDecodeHelper_h__
+
+#include "nsError.h"
+#include "uconvutil.h"
+//----------------------------------------------------------------------
+// Class nsUnicodeDecodeHelper [declaration]
+
+/**
+ *
+ * @created         18/Mar/1998
+ * @author  Catalin Rotaru [CATA]
+ */
+class nsUnicodeDecodeHelper
+{
+public:
+  /**
+   * Converts data using a lookup table and optional shift table
+   */
+  static nsresult ConvertByTable(const char * aSrc, int32_t * aSrcLength, 
+                                 char16_t * aDest, int32_t * aDestLength,
+                                 uScanClassID aScanClass,
+                                 uShiftInTable * aShiftInTable,
+                                 uMappingTable  * aMappingTable,
+                                 bool aErrorSignal = false);
+
+  /**
+   * Converts data using a set of lookup tables.
+   */
+  static nsresult ConvertByMultiTable(const char * aSrc, int32_t * aSrcLength,
+      char16_t * aDest, int32_t * aDestLength, int32_t aTableCount, 
+      const uRange * aRangeArray, uScanClassID * aScanClassArray,
+      uMappingTable ** aMappingTable, bool aErrorSignal = false);
+
+  /**
+   * Converts data using a fast lookup table.
+   */
+  static nsresult ConvertByFastTable(const char * aSrc, int32_t * aSrcLength, 
+      char16_t * aDest, int32_t * aDestLength, const char16_t * aFastTable, 
+      int32_t aTableSize, bool aErrorSignal);
+
+  /**
+   * Create a cache-like fast lookup table from a normal one.
+   */
+  static nsresult CreateFastTable(uMappingTable * aMappingTable,
+      char16_t * aFastTable,  int32_t aTableSize);
+};
+
+#endif // nsUnicodeDecodeHelper_h__
+
+