| 1 | /* $Id: asn1-default-allocator.cpp 51915 2014-07-08 01:36:31Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - ASN.1, Default Allocator.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2014 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 | /*******************************************************************************
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| 28 | * Header Files *
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| 29 | *******************************************************************************/
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| 30 | #include "internal/iprt.h"
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| 31 | #include <iprt/asn1.h>
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| 32 |
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| 33 | #include <iprt/mem.h>
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| 34 | #include <iprt/err.h>
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| 35 | #include <iprt/string.h>
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| 36 |
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| 37 |
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| 38 | /**
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| 39 | * Aligns allocation sizes a little.
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| 40 | *
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| 41 | * @returns Aligned size.
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| 42 | * @param cb Requested size.
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| 43 | */
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| 44 | static size_t rtAsn1DefaultAllocator_AlignSize(size_t cb)
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| 45 | {
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| 46 | if (cb >= 64)
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| 47 | return RT_ALIGN_Z(cb, 64);
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| 48 | if (cb >= 32)
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| 49 | return RT_ALIGN_Z(cb, 32);
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| 50 | if (cb >= 16)
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| 51 | return RT_ALIGN_Z(cb, 16);
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| 52 | return cb;
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| 53 | }
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| 54 |
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| 55 |
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| 56 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE, pfnFree} */
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| 57 | static DECLCALLBACK(void) rtAsn1DefaultAllocator_Free(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation, void *pv)
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| 58 | {
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| 59 | RTMemFree(pv);
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| 60 | pAllocation->cbAllocated = 0;
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| 61 | }
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| 62 |
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| 63 |
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| 64 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE, pfnAlloc} */
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| 65 | static DECLCALLBACK(int) rtAsn1DefaultAllocator_Alloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
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| 66 | void **ppv, size_t cb)
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| 67 | {
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| 68 | size_t cbAlloc = rtAsn1DefaultAllocator_AlignSize(cb);
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| 69 | void *pv = RTMemAllocZ(cbAlloc);
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| 70 | if (pv)
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| 71 | {
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| 72 | *ppv = pv;
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| 73 | pAllocation->cbAllocated = (uint32_t)cbAlloc;
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| 74 | return VINF_SUCCESS;
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| 75 | }
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| 76 | return VERR_NO_MEMORY;
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| 77 | }
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| 78 |
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| 79 |
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| 80 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE, pfnRealloc} */
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| 81 | static DECLCALLBACK(int) rtAsn1DefaultAllocator_Realloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
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| 82 | void *pvOld, void **ppvNew, size_t cbNew)
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| 83 | {
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| 84 | Assert(pvOld);
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| 85 | Assert(cbNew);
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| 86 | size_t cbAlloc = rtAsn1DefaultAllocator_AlignSize(cbNew);
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| 87 | void *pv = RTMemRealloc(pvOld, cbAlloc);
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| 88 | if (pv)
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| 89 | {
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| 90 | *ppvNew = pv;
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| 91 | pAllocation->cbAllocated = (uint32_t)cbAlloc;
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| 92 | return VINF_SUCCESS;
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| 93 | }
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| 94 | return VERR_NO_MEMORY;
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| 95 | }
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| 96 |
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| 97 |
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| 98 | /** The default ASN.1 allocator. */
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| 99 | RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1DefaultAllocator =
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| 100 | {
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| 101 | rtAsn1DefaultAllocator_Free,
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| 102 | rtAsn1DefaultAllocator_Alloc,
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| 103 | rtAsn1DefaultAllocator_Realloc
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| 104 | };
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| 105 |
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