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/* $Id: asn1-efence-allocator.cpp $ */
/** @file
* IPRT - ASN.1, Electric Fense Allocator.
*/
/*
* Copyright (C) 2006-2019 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/asn1.h>
#include <iprt/mem.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFree} */
static DECLCALLBACK(void) rtAsn1EFenceAllocator_Free(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation, void *pv)
{
RT_NOREF_PV(pThis);
RTMemEfFreeNP(pv);
pAllocation->cbAllocated = 0;
}
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnAlloc} */
static DECLCALLBACK(int) rtAsn1EFenceAllocator_Alloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
void **ppv, size_t cb)
{
void *pv = RTMemEfAllocZNP(cb, RTMEM_TAG);
if (pv)
{
*ppv = pv;
pAllocation->cbAllocated = (uint32_t)cb;
return VINF_SUCCESS;
}
RT_NOREF_PV(pThis);
return VERR_NO_MEMORY;
}
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnRealloc} */
static DECLCALLBACK(int) rtAsn1EFenceAllocator_Realloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
void *pvOld, void **ppvNew, size_t cbNew)
{
Assert(pvOld);
Assert(cbNew);
void *pv = RTMemEfReallocNP(pvOld, cbNew, RTMEM_TAG);
if (pv)
{
*ppvNew = pv;
pAllocation->cbAllocated = (uint32_t)cbNew;
return VINF_SUCCESS;
}
RT_NOREF_PV(pThis);
return VERR_NO_MEMORY;
}
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFreeArray} */
static DECLCALLBACK(void) rtAsn1EFenceAllocator_FreeArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
void **papvArray)
{
RT_NOREF_PV(pThis);
Assert(papvArray);
Assert(pAllocation->cbEntry);
Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
uint32_t i = pAllocation->cEntriesAllocated;
while (i-- > 0)
{
RTMemEfFreeNP(papvArray[i]);
papvArray[i] = NULL;
}
RTMemEfFreeNP(papvArray);
pAllocation->cEntriesAllocated = 0;
pAllocation->cPointersAllocated = 0;
}
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnGrowArray} */
static DECLCALLBACK(int) rtAsn1EFenceAllocator_GrowArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
void ***ppapvArray, uint32_t cMinEntries)
{
RT_NOREF_PV(pThis);
Assert(pAllocation->cbEntry);
Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
/*
* Resize the pointer array.
*/
void **papvArray = *ppapvArray;
void *pvPointers = RTMemEfReallocNP(papvArray, cMinEntries * sizeof(void *), RTMEM_TAG);
if (pvPointers)
{
*ppapvArray = papvArray = (void **)pvPointers;
if (cMinEntries > pAllocation->cPointersAllocated) /* possible on multiple shrink failures */
RT_BZERO(&papvArray[pAllocation->cPointersAllocated],
(cMinEntries - pAllocation->cPointersAllocated) * sizeof(void *));
else
AssertFailed();
pAllocation->cPointersAllocated = cMinEntries;
}
else if (cMinEntries > pAllocation->cPointersAllocated)
return VERR_NO_MEMORY;
/* else: possible but unlikely */
/*
* Add more entries.
*/
while (pAllocation->cEntriesAllocated < cMinEntries)
{
void *pv;
papvArray[pAllocation->cEntriesAllocated] = pv = RTMemEfAllocZNP(pAllocation->cbEntry, RTMEM_TAG);
if (pv)
pAllocation->cEntriesAllocated++;
else
return VERR_NO_MEMORY;
}
return VINF_SUCCESS;
}
/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnShrinkArray} */
static DECLCALLBACK(void) rtAsn1EFenceAllocator_ShrinkArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
void ***ppapvArray, uint32_t cNew, uint32_t cCurrent)
{
RT_NOREF_PV(pThis);
Assert(pAllocation->cbEntry);
Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
/*
* We always free and resize.
*/
Assert(pAllocation->cEntriesAllocated == cCurrent);
Assert(cNew < cCurrent);
/* Free entries. */
void **papvArray = *ppapvArray;
while (cCurrent-- > cNew)
{
RTMemEfFreeNP(papvArray[cCurrent]);
papvArray[cCurrent] = NULL;
}
pAllocation->cEntriesAllocated = cNew;
/* Try resize pointer array. Failure here is a genuine possibility since the
efence code will try allocate a new block. This causes extra fun in the
grow method above. */
void *pvPointers = RTMemEfReallocNP(papvArray, cNew * sizeof(void *), RTMEM_TAG);
if (pvPointers)
{
*ppapvArray = (void **)pvPointers;
pAllocation->cPointersAllocated = cNew;
}
}
/** The Electric Fence ASN.1 allocator. */
RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1EFenceAllocator =
{
rtAsn1EFenceAllocator_Free,
rtAsn1EFenceAllocator_Alloc,
rtAsn1EFenceAllocator_Realloc,
rtAsn1EFenceAllocator_FreeArray,
rtAsn1EFenceAllocator_GrowArray,
rtAsn1EFenceAllocator_ShrinkArray
};
#if 0 && defined(IN_RING3) /* for efence testing */
RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1DefaultAllocator =
{
rtAsn1EFenceAllocator_Free,
rtAsn1EFenceAllocator_Alloc,
rtAsn1EFenceAllocator_Realloc,
rtAsn1EFenceAllocator_FreeArray,
rtAsn1EFenceAllocator_GrowArray,
rtAsn1EFenceAllocator_ShrinkArray
};
#endif
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