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diff --git a/mobicore/MobiCoreDriverLib/ClientLib/Contrib/iclient.h b/mobicore/MobiCoreDriverLib/ClientLib/Contrib/iclient.h
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+++ b/mobicore/MobiCoreDriverLib/ClientLib/Contrib/iclient.h
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+/*
+ * Copyright (c) 2013-2015 TRUSTONIC LIMITED
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the TRUSTONIC LIMITED nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __CLIENT_INTERFACE_H__
+#define __CLIENT_INTERFACE_H__
+
+#include <stdint.h>     // *int*_t
+#include <sys/types.h>  // uid_t git_t
+#include "mc_user.h"    // ioctl structures
+
+class IClient {
+public:
+    virtual ~IClient() {}
+    virtual int open() = 0;
+    virtual int close() = 0;
+    virtual bool isOpen() const = 0;
+    // MC protocol, also used by GP for now
+    virtual int hasOpenSessions() const = 0;
+    virtual int openSession(struct mc_ioctl_open_session& session) = 0;
+    virtual int openTrustlet(struct mc_ioctl_open_trustlet& trustlet) = 0;
+    virtual int closeSession(uint32_t session_id) = 0;
+    virtual int notify(uint32_t session_id) = 0;
+    virtual int waitNotification(const struct mc_ioctl_wait& wait) = 0;
+    virtual int malloc(uint8_t** buffer, uint32_t length) = 0;
+    virtual int free(uint8_t* buffer, uint32_t length) = 0;
+    virtual int map(struct mc_ioctl_map& map) = 0;
+    virtual int unmap(const struct mc_ioctl_map& map) = 0;
+    virtual int getError(struct mc_ioctl_geterr& err) = 0;
+    virtual int getVersion(struct mc_version_info& version_info) = 0;
+    // GP protocol only
+    virtual int gpRequestCancellation(uint32_t session_id) = 0;
+};
+
+#endif // __CLIENT_INTERFACE_H__