USBLib.cpp revision c55c68b6a3324172e9dc207926215845880b0f90
/* $Id$ */
/** @file
* VirtualBox USB Library, Common Bits.
*/
/*
* Copyright (C) 2006-2008 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.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <VBox/usblib.h>
/**
* 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)
{
if (!pszSerial)
pszSerial = "";
register const uint8_t *pu8 = (const uint8_t *)pszSerial;
register uint64_t u64 = UINT64_C(14695981039346656037);
for (;;)
{
register uint8_t u8 = *pu8;
if (!u8)
break;
u64 = (u64 * UINT64_C(1099511628211)) ^ u8;
pu8++;
}
return u64;
}