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/** @file
* USBLib - Library for wrapping up the VBoxUSB functionality. (DEV,HDrv,Main)
*/
/*
* Copyright (C) 2006-2020 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_INCLUDED_usblib_h
#define VBOX_INCLUDED_usblib_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <VBox/cdefs.h>
#include <VBox/types.h>
#include <VBox/usb.h>
#include <VBox/usbfilter.h>
#include <iprt/ctype.h>
#include <iprt/string.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 */
/**
* Purge string of non-UTF-8 encodings and control characters.
*
* Control characters creates problems when presented to the user and currently
* also when used in XML settings. So, we must purge them in the USB vendor,
* product, and serial number strings.
*
* @returns String length (excluding terminator).
* @param psz The string to purge.
*
* @remarks The return string may be shorter than the input, left over space
* after the end of the string will be filled with zeros.
*/
DECLINLINE(size_t) USBLibPurgeEncoding(char *psz)
{
if (psz)
{
size_t offSrc;
/* Beat it into valid UTF-8 encoding. */
RTStrPurgeEncoding(psz);
/* Look for control characters. */
for (offSrc = 0; ; offSrc++)
{
char ch = psz[offSrc];
if (RT_UNLIKELY(RT_C_IS_CNTRL(ch) && ch != '\0'))
{
/* Found a control character! Replace tab by space and remove all others. */
size_t offDst = offSrc;
for (;; offSrc++)
{
ch = psz[offSrc];
if (RT_C_IS_CNTRL(ch) && ch != '\0')
{
if (ch == '\t')
ch = ' ';
else
continue;
}
psz[offDst++] = ch;
if (ch == '\0')
break;
}
/* Wind back to the zero terminator and zero fill any gap to make
USBFilterValidate happy. (offSrc is at zero terminator too.) */
offDst--;
while (offSrc > offDst)
psz[offSrc--] = '\0';
return offDst;
}
if (ch == '\0')
break;
}
return offSrc;
}
return 0;
}
/** @} */
RT_C_DECLS_END
#endif /* !VBOX_INCLUDED_usblib_h */
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