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diff --git a/comm/mailnews/intl/nsUnicodeToUTF7.h b/comm/mailnews/intl/nsUnicodeToUTF7.h
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+++ b/comm/mailnews/intl/nsUnicodeToUTF7.h
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+/* -*- Mode: C++; tab-width: 2; 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 nsUnicodeToUTF7_h___
+#define nsUnicodeToUTF7_h___
+
+//----------------------------------------------------------------------
+// Class nsBasicUTF7Encoder [declaration]
+
+/**
+ * Basic class for a character set converter from Unicode to UTF-7.
+ *
+ * @created         03/Jun/1999
+ * @author  Catalin Rotaru [CATA]
+ */
+class nsBasicUTF7Encoder {
+ public:
+  /**
+   * Class constructor.
+   */
+  nsBasicUTF7Encoder(char aLastChar, char aEscChar);
+  NS_IMETHOD ConvertNoBuffNoErr(const char16_t* aSrc, int32_t* aSrcLength,
+                                char* aDest, int32_t* aDestLength);
+  NS_IMETHOD FinishNoBuff(char* aDest, int32_t* aDestLength);
+
+ protected:
+  int32_t mEncoding;  // current encoding
+  uint32_t mEncBits;
+  int32_t mEncStep;
+  char mLastChar;
+  char mEscChar;
+
+  nsresult ShiftEncoding(int32_t aEncoding, char* aDest, int32_t* aDestLength);
+  nsresult EncodeDirect(const char16_t* aSrc, int32_t* aSrcLength, char* aDest,
+                        int32_t* aDestLength);
+  nsresult EncodeBase64(const char16_t* aSrc, int32_t* aSrcLength, char* aDest,
+                        int32_t* aDestLength);
+  char ValueToChar(uint32_t aValue);
+  virtual bool DirectEncodable(char16_t aChar);
+
+  //--------------------------------------------------------------------
+  // Subclassing of nsEncoderSupport class [declaration]
+
+  NS_IMETHOD Reset();
+};
+
+//----------------------------------------------------------------------
+// Class nsUnicodeToUTF7 [declaration]
+
+/**
+ * A character set converter from Unicode to UTF-7.
+ *
+ * @created         03/Jun/1999
+ * @author  Catalin Rotaru [CATA]
+ */
+class nsUnicodeToUTF7 : public nsBasicUTF7Encoder {
+ public:
+  /**
+   * Class constructor.
+   */
+  nsUnicodeToUTF7();
+
+ protected:
+  virtual bool DirectEncodable(char16_t aChar);
+};
+
+#endif /* nsUnicodeToUTF7_h___ */