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/* $Id: VDIoRnd.cpp $ */
/** @file
* VBox HDD container test utility - I/O data generator.
*/
/*
* Copyright (C) 2011-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOGGROUP LOGGROUP_DEFAULT
#include <iprt/log.h>
#include <iprt/errcore.h>
#include <iprt/mem.h>
#include <iprt/rand.h>
#include <iprt/assert.h>
#include "VDIoRnd.h"
/**
* I/O random data generator instance data.
*/
typedef struct VDIORND
{
/** Pointer to the buffer holding the random data. */
uint8_t *pbPattern;
/** Size of the buffer. */
size_t cbPattern;
/** RNG */
RTRAND hRand;
} VDIORND;
int VDIoRndCreate(PPVDIORND ppIoRnd, size_t cbPattern, uint64_t uSeed)
{
PVDIORND pIoRnd = NULL;
int rc = VINF_SUCCESS;
AssertPtrReturn(ppIoRnd, VERR_INVALID_POINTER);
pIoRnd = (PVDIORND)RTMemAllocZ(sizeof(VDIORND));
if (pIoRnd)
pIoRnd->pbPattern = (uint8_t *)RTMemPageAllocZ(cbPattern);
if ( pIoRnd
&& pIoRnd->pbPattern)
{
pIoRnd->cbPattern = cbPattern;
rc = RTRandAdvCreateParkMiller(&pIoRnd->hRand);
if (RT_SUCCESS(rc))
{
RTRandAdvSeed(pIoRnd->hRand, uSeed);
RTRandAdvBytes(pIoRnd->hRand, pIoRnd->pbPattern, cbPattern);
}
else
{
RTMemPageFree(pIoRnd->pbPattern, cbPattern);
RTMemFree(pIoRnd);
}
}
else
{
if (pIoRnd)
RTMemFree(pIoRnd);
rc = VERR_NO_MEMORY;
}
if (RT_SUCCESS(rc))
*ppIoRnd = pIoRnd;
return rc;
}
void VDIoRndDestroy(PVDIORND pIoRnd)
{
AssertPtrReturnVoid(pIoRnd);
RTRandAdvDestroy(pIoRnd->hRand);
RTMemPageFree(pIoRnd->pbPattern, pIoRnd->cbPattern);
RTMemFree(pIoRnd);
}
int VDIoRndGetBuffer(PVDIORND pIoRnd, void **ppv, size_t cb)
{
AssertPtrReturn(pIoRnd, VERR_INVALID_POINTER);
AssertPtrReturn(ppv, VERR_INVALID_POINTER);
AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
if (cb > pIoRnd->cbPattern - 512)
return VERR_INVALID_PARAMETER;
*ppv = pIoRnd->pbPattern + RT_ALIGN_64(RTRandAdvU64Ex(pIoRnd->hRand, 0, pIoRnd->cbPattern - cb - 512), 512);
return VINF_SUCCESS;
}
uint32_t VDIoRndGetU32Ex(PVDIORND pIoRnd, uint32_t uMin, uint32_t uMax)
{
return RTRandAdvU32Ex(pIoRnd->hRand, uMin, uMax);
}
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