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diff --git a/intl/icu/source/i18n/csrecog.h b/intl/icu/source/i18n/csrecog.h
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+++ b/intl/icu/source/i18n/csrecog.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+ **********************************************************************
+ *   Copyright (C) 2005-2012, International Business Machines
+ *   Corporation and others.  All Rights Reserved.
+ **********************************************************************
+ */
+
+#ifndef __CSRECOG_H
+#define __CSRECOG_H
+
+#include "unicode/uobject.h"
+
+#if !UCONFIG_NO_CONVERSION
+
+#include "inputext.h"
+
+U_NAMESPACE_BEGIN
+
+class CharsetMatch;
+
+class CharsetRecognizer : public UMemory
+{
+ public:
+    /**
+     * Get the IANA name of this charset.
+     * Note that some recognizers can recognize more than one charset, but that this API
+     * assumes just one name per recognizer.
+     * TODO: need to account for multiple names in public API that enumerates over the
+     *       known detectable charsets.
+     * @return the charset name.
+     */
+    virtual const char *getName() const = 0;
+    
+    /**
+     * Get the ISO language code for this charset.
+     * @return the language code, or <code>null</code> if the language cannot be determined.
+     */
+    virtual const char *getLanguage() const;
+        
+    /*
+     * Try the given input text against this Charset, and fill in the results object
+     * with the quality of the match plus other information related to the match.
+     *
+     * Return true if the the input bytes are a potential match, and
+     * false if the input data is not compatible with, or illegal in this charset.
+     */
+    virtual UBool match(InputText *textIn, CharsetMatch *results) const = 0;
+
+    virtual ~CharsetRecognizer();
+};
+
+U_NAMESPACE_END
+
+#endif
+#endif /* __CSRECOG_H */