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diff --git a/include/VBox/usblib.h b/include/VBox/usblib.h
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+/** @file
+ * USBLib - Library for wrapping up the VBoxUSB functionality. (DEV,HDrv,Main)
+ */
+
+/*
+ * Copyright (C) 2006-2007 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef ___VBox_usblib_h
+#define ___VBox_usblib_h
+
+#include <VBox/cdefs.h>
+#include <VBox/types.h>
+#include <VBox/usb.h>
+#include <VBox/usbfilter.h>
+
+#ifdef RT_OS_WINDOWS
+# include <VBox/usblib-win.h>
+#endif
+#ifdef RT_OS_SOLARIS
+# include <VBox/usblib-solaris.h>
+#endif
+#ifdef RT_OS_DARWIN
+# include <VBox/usblib-darwin.h>
+#endif
+/** @todo merge the usblib-win.h interface into the darwin and linux ports where suitable. */
+
+RT_C_DECLS_BEGIN
+/** @defgroup grp_USBLib    USBLib - USB Support Library
+ * This module implements the basic low-level OS interfaces and common USB code.
+ * @{
+ */
+
+#ifdef IN_RING3
+/**
+ * Initializes the USBLib component.
+ *
+ * The USBLib keeps a per process connection to the kernel driver
+ * and all USBLib users within a process will share the same
+ * connection. USBLib does reference counting to make sure that
+ * the connection remains open until all users has called USBLibTerm().
+ *
+ * @returns VBox status code.
+ *
+ * @remark  The users within the process are responsible for not calling
+ *          this function at the same time (because I'm lazy).
+ */
+USBLIB_DECL(int) USBLibInit(void);
+
+/**
+ * Terminates the USBLib component.
+ *
+ * Must match successful USBLibInit calls.
+ *
+ * @returns VBox status code.
+ */
+USBLIB_DECL(int) USBLibTerm(void);
+
+/**
+ * Adds a filter.
+ *
+ * This function will validate and transfer the specified filter
+ * to the kernel driver and make it start using it. The kernel
+ * driver will return a filter id that this function passes on
+ * to its caller.
+ *
+ * The kernel driver will associate the added filter with the
+ * calling process and automatically remove all filters when
+ * the process terminates the connection to it or dies.
+ *
+ * @returns Filter id for passing to USBLibRemoveFilter on success.
+ * @returns NULL on failure.
+ *
+ * @param   pFilter     The filter to add.
+ */
+USBLIB_DECL(void *) USBLibAddFilter(PCUSBFILTER pFilter);
+
+/**
+ * Removes a filter.
+ *
+ * @param   pvId        The ID returned by USBLibAddFilter.
+ */
+USBLIB_DECL(void) USBLibRemoveFilter(void *pvId);
+
+/**
+ * Calculate the hash of the serial string.
+ *
+ * 64bit FNV1a, chosen because it is designed to hash in to a power of two
+ * space, and is much quicker and simpler than, say, a half MD4.
+ *
+ * @returns the hash.
+ * @param   pszSerial       The serial string.
+ */
+USBLIB_DECL(uint64_t) USBLibHashSerial(const char *pszSerial);
+
+#endif /* IN_RING3 */
+
+/** @} */
+RT_C_DECLS_END
+
+#endif
+