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diff --git a/addons/ooh323c/src/ooDateTime.h b/addons/ooh323c/src/ooDateTime.h
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+++ b/addons/ooh323c/src/ooDateTime.h
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+/*
+ * Copyright (C) 2004-2005 by Objective Systems, Inc.
+ *
+ * This software is furnished under an open source license and may be 
+ * used and copied only in accordance with the terms of this license. 
+ * The text of the license may generally be found in the root 
+ * directory of this installation in the LICENSE.txt file.  It 
+ * can also be viewed online at the following URL:
+ *
+ *   http://www.obj-sys.com/open/license.html
+ *
+ * Any redistributions of this file including modified versions must 
+ * maintain this copyright notice.
+ *
+ *****************************************************************************/
+/** 
+ * @file ooDateTime.h 
+ * Time functions that reconcile differences between Windows and UNIX.
+ */
+#ifndef _OOTIME_H_
+#define _OOTIME_H_
+
+#include "ooCommon.h"
+#include <time.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * This function provides an abstraction for the UNIX 'gettimeofday' 
+ * function which is not available on Windows.
+ *
+ * @param tv           Pointer to time value structure to receive 
+ *                     current time value.
+ * @param tz           Point to time zone information.
+ * @return             Completion status of operation: 0 = success,
+ *                     negative return value is error.
+ */
+EXTERN int ooGetTimeOfDay (struct timeval *tv, struct timezone *tz);
+
+/**
+ * This function subtracts first timeval parameter from second and provides
+ * the difference in milliseconds.
+ * @param tv1          Pointer to timeval value.
+ * @param tv2          Pointer to timeval value.
+ *
+ * @return             Difference between two timevals in milliseconds.
+ */
+EXTERN long ooGetTimeDiff(struct timeval *tv1, struct timeval *tv2);
+#ifdef __cplusplus
+}
+#endif
+#endif