1 | /* $Id: asn1-efence-allocator.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - ASN.1, Electric Fense Allocator.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 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 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "internal/iprt.h"
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32 | #include <iprt/asn1.h>
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33 |
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34 | #include <iprt/mem.h>
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35 | #include <iprt/err.h>
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36 | #include <iprt/string.h>
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37 |
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38 |
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39 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFree} */
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40 | static DECLCALLBACK(void) rtAsn1EFenceAllocator_Free(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation, void *pv)
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41 | {
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42 | RT_NOREF_PV(pThis);
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43 | RTMemEfFreeNP(pv);
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44 | pAllocation->cbAllocated = 0;
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45 | }
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46 |
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47 |
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48 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnAlloc} */
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49 | static DECLCALLBACK(int) rtAsn1EFenceAllocator_Alloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
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50 | void **ppv, size_t cb)
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51 | {
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52 | void *pv = RTMemEfAllocZNP(cb, RTMEM_TAG);
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53 | if (pv)
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54 | {
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55 | *ppv = pv;
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56 | pAllocation->cbAllocated = (uint32_t)cb;
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57 | return VINF_SUCCESS;
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58 | }
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59 | RT_NOREF_PV(pThis);
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60 | return VERR_NO_MEMORY;
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61 | }
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62 |
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63 |
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64 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnRealloc} */
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65 | static DECLCALLBACK(int) rtAsn1EFenceAllocator_Realloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
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66 | void *pvOld, void **ppvNew, size_t cbNew)
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67 | {
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68 | Assert(pvOld);
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69 | Assert(cbNew);
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70 | void *pv = RTMemEfReallocNP(pvOld, cbNew, RTMEM_TAG);
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71 | if (pv)
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72 | {
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73 | *ppvNew = pv;
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74 | pAllocation->cbAllocated = (uint32_t)cbNew;
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75 | return VINF_SUCCESS;
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76 | }
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77 | RT_NOREF_PV(pThis);
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78 | return VERR_NO_MEMORY;
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79 | }
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80 |
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81 |
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82 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFreeArray} */
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83 | static DECLCALLBACK(void) rtAsn1EFenceAllocator_FreeArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
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84 | void **papvArray)
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85 | {
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86 | RT_NOREF_PV(pThis);
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87 | Assert(papvArray);
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88 | Assert(pAllocation->cbEntry);
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89 | Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
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90 |
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91 | uint32_t i = pAllocation->cEntriesAllocated;
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92 | while (i-- > 0)
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93 | {
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94 | RTMemEfFreeNP(papvArray[i]);
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95 | papvArray[i] = NULL;
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96 | }
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97 | RTMemEfFreeNP(papvArray);
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98 |
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99 | pAllocation->cEntriesAllocated = 0;
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100 | pAllocation->cPointersAllocated = 0;
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101 | }
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102 |
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103 |
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104 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnGrowArray} */
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105 | static DECLCALLBACK(int) rtAsn1EFenceAllocator_GrowArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
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106 | void ***ppapvArray, uint32_t cMinEntries)
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107 | {
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108 | RT_NOREF_PV(pThis);
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109 | Assert(pAllocation->cbEntry);
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110 | Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
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111 |
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112 | /*
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113 | * Resize the pointer array.
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114 | */
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115 | void **papvArray = *ppapvArray;
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116 | void *pvPointers = RTMemEfReallocNP(papvArray, cMinEntries * sizeof(void *), RTMEM_TAG);
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117 | if (pvPointers)
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118 | {
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119 | *ppapvArray = papvArray = (void **)pvPointers;
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120 | if (cMinEntries > pAllocation->cPointersAllocated) /* possible on multiple shrink failures */
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121 | RT_BZERO(&papvArray[pAllocation->cPointersAllocated],
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122 | (cMinEntries - pAllocation->cPointersAllocated) * sizeof(void *));
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123 | else
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124 | AssertFailed();
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125 | pAllocation->cPointersAllocated = cMinEntries;
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126 | }
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127 | else if (cMinEntries > pAllocation->cPointersAllocated)
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128 | return VERR_NO_MEMORY;
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129 | /* else: possible but unlikely */
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130 |
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131 | /*
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132 | * Add more entries.
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133 | */
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134 | while (pAllocation->cEntriesAllocated < cMinEntries)
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135 | {
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136 | void *pv;
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137 | papvArray[pAllocation->cEntriesAllocated] = pv = RTMemEfAllocZNP(pAllocation->cbEntry, RTMEM_TAG);
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138 | if (pv)
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139 | pAllocation->cEntriesAllocated++;
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140 | else
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141 | return VERR_NO_MEMORY;
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142 | }
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143 |
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144 | return VINF_SUCCESS;
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145 | }
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146 |
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147 |
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148 | /** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnShrinkArray} */
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149 | static DECLCALLBACK(void) rtAsn1EFenceAllocator_ShrinkArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
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150 | void ***ppapvArray, uint32_t cNew, uint32_t cCurrent)
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151 | {
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152 | RT_NOREF_PV(pThis);
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153 | Assert(pAllocation->cbEntry);
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154 | Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
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155 |
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156 | /*
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157 | * We always free and resize.
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158 | */
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159 | Assert(pAllocation->cEntriesAllocated == cCurrent);
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160 | Assert(cNew < cCurrent);
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161 |
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162 | /* Free entries. */
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163 | void **papvArray = *ppapvArray;
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164 | while (cCurrent-- > cNew)
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165 | {
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166 | RTMemEfFreeNP(papvArray[cCurrent]);
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167 | papvArray[cCurrent] = NULL;
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168 | }
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169 | pAllocation->cEntriesAllocated = cNew;
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170 |
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171 | /* Try resize pointer array. Failure here is a genuine possibility since the
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172 | efence code will try allocate a new block. This causes extra fun in the
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173 | grow method above. */
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174 | void *pvPointers = RTMemEfReallocNP(papvArray, cNew * sizeof(void *), RTMEM_TAG);
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175 | if (pvPointers)
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176 | {
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177 | *ppapvArray = (void **)pvPointers;
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178 | pAllocation->cPointersAllocated = cNew;
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179 | }
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180 | }
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181 |
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182 |
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183 | /** The Electric Fence ASN.1 allocator. */
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184 | RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1EFenceAllocator =
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185 | {
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186 | rtAsn1EFenceAllocator_Free,
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187 | rtAsn1EFenceAllocator_Alloc,
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188 | rtAsn1EFenceAllocator_Realloc,
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189 | rtAsn1EFenceAllocator_FreeArray,
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190 | rtAsn1EFenceAllocator_GrowArray,
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191 | rtAsn1EFenceAllocator_ShrinkArray
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192 | };
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193 |
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194 | #if 0 && defined(IN_RING3) /* for efence testing */
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195 | RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1DefaultAllocator =
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196 | {
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197 | rtAsn1EFenceAllocator_Free,
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198 | rtAsn1EFenceAllocator_Alloc,
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199 | rtAsn1EFenceAllocator_Realloc,
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200 | rtAsn1EFenceAllocator_FreeArray,
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201 | rtAsn1EFenceAllocator_GrowArray,
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202 | rtAsn1EFenceAllocator_ShrinkArray
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203 | };
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204 | #endif
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205 |
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