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diff --git a/comm/mailnews/intl/nsICharsetConverterManager.idl b/comm/mailnews/intl/nsICharsetConverterManager.idl
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+++ b/comm/mailnews/intl/nsICharsetConverterManager.idl
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+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+%{C++
+#include "mozilla/Encoding.h"
+
+// XXX change to NS_CHARSETCONVERTERMANAGER_CID
+#define NS_ICHARSETCONVERTERMANAGER_CID \
+  {0x3c1c0163, 0x9bd0, 0x11d3, { 0x9d, 0x9, 0x0, 0x50, 0x4, 0x0, 0x7, 0xb2}}
+
+#define NS_CHARSETCONVERTERMANAGER_CONTRACTID "@mozilla.org/charset-converter-manager;1"
+%}
+
+[scriptable, uuid(a0550d46-8d9c-47dd-acc7-c083620dff12)]
+interface nsICharsetConverterManager : nsISupports
+{
+    /**
+     * A shortcut to calling nsICharsetAlias to do alias resolution
+     * @throws if aCharset is an unknown charset.
+     */
+    ACString getCharsetAlias(in string aCharset);
+
+    /**
+     * Get the human-readable name for the given charset.
+     * @throws if aCharset is an unknown charset.
+     */
+    AString getCharsetTitle(in string aCharset);
+
+    /**
+     * Get some data about the given charset. This includes whether the
+     * character encoding may be used for certain purposes, if it is
+     * multi-byte, and the language code for it. See charsetData.properties
+     * for the source of this data. Some known property names:
+     *    LangGroup      - language code for charset, e.g. 'he' and 'zh-CN'.
+     *    isMultibyte    - is this a multi-byte charset?
+     *    isInternal     - not to be used in untrusted web content.
+     *
+     * @param aCharset name of the character encoding, e.g. 'iso-8859-15'.
+     * @param aProp property desired for the character encoding.
+     * @throws if aCharset is an unknown charset.
+     * @return the value of the property, for the character encoding.
+     */
+    AString getCharsetData(in string aCharset,
+                           in wstring aProp);
+
+    /**
+     * Get the language group for the given charset. This is similar to
+     * calling <tt>getCharsetData</tt> with the <tt>prop</tt> "LangGroup".
+     *
+     * @param aCharset name of the character encoding, e.g. 'iso-8859-15'.
+     * @throws if aCharset is an unknown charset.
+     * @return the language code for the character encoding.
+     */
+    AUTF8String getCharsetLangGroup(in string aCharset);
+    AUTF8String getCharsetLangGroupRaw(in string aCharset);
+
+    /**
+     * Decoding of UTF-7 in message headers and bodies.
+     */
+    AString utf7ToUnicode(in ACString aMutf7);
+
+    /**
+     * Support for Modified UTF-7 (MUTF-7) used by IMAP.
+     */
+    AString mutf7ToUnicode(in ACString aMutf7);
+    ACString unicodeToMutf7(in AString aUnicode);
+};