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diff --git a/libical/src/libicalss/icalcstp.h b/libical/src/libicalss/icalcstp.h
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+++ b/libical/src/libicalss/icalcstp.h
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+/* -*- Mode: C -*- */
+/*======================================================================
+  FILE: icalcstp.h
+  CREATOR: eric 20 April 1999
+  
+  $Id$
+
+
+ (C) COPYRIGHT 2000, Eric Busboom, http://www.softwarestudio.org
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of either: 
+
+    The LGPL as published by the Free Software Foundation, version
+    2.1, available at: http://www.fsf.org/copyleft/lesser.html
+
+  Or:
+
+    The Mozilla Public License Version 1.0. You may obtain a copy of
+    the License at http://www.mozilla.org/MPL/
+
+  The original code is icalcstp.h
+
+======================================================================*/
+
+
+#ifndef ICALCSTP_H
+#define ICALCSTP_H
+
+#include "ical.h"
+
+
+/* Connection state, from the state machine in RFC2445 */
+enum cstps_state {
+    NO_STATE,
+    CONNECTED,
+    AUTHENTICATED,
+    IDENTIFIED,
+    DISCONNECTED,
+    RECEIVE
+};
+
+/* CSTP Commands that a client can issue to a server */
+typedef enum icalcstp_command {
+    ICAL_ABORT_COMMAND,
+    ICAL_AUTHENTICATE_COMMAND,
+    ICAL_CAPABILITY_COMMAND,
+    ICAL_CONTINUE_COMMAND,
+    ICAL_CALIDEXPAND_COMMAND,
+    ICAL_IDENTIFY_COMMAND,
+    ICAL_DISCONNECT_COMMAND,
+    ICAL_SENDDATA_COMMAND,
+    ICAL_STARTTLS_COMMAND,
+    ICAL_UPNEXPAND_COMMAND,
+    ICAL_COMPLETE_COMMAND,
+    ICAL_UNKNOWN_COMMAND
+} icalcstp_command;
+
+
+
+/* A statement is a combination of command or response code and a
+   component that the server and client exchage with each other. */
+struct icalcstp_statement {
+    icalcstp_command command;
+    char* str_data; /* If non-NUll use as arguments to command */
+    int int_data; /* If non-NULL use as arguments to command */
+
+    icalrequeststatus code;
+
+    icalcomponent* data;
+};
+
+const char* icalcstp_command_to_string(icalcstp_command command);
+icalcstp_command icalcstp_string_to_command(const char* str);
+
+#endif /* !ICALCSTP_H */
+
+
+