1 | //////////////////////////////////////////////////////////// |
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2 | // Copyright (C) Roman Ryltsov, 2008-2011 |
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3 | // Created by Roman Ryltsov roman@alax.info |
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4 | // |
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5 | // $Id: VirtualHeapPtr.cpp 33 2011-11-04 09:50:08Z roman $ |
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6 | |
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7 | #include "stdafx.h" |
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8 | #include <psapi.h> |
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9 | |
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10 | #pragma comment(lib, "psapi.lib") |
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11 | |
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12 | //////////////////////////////////////////////////////////// |
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13 | // CGlobalVirtualAllocator |
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14 | |
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15 | class CGlobalVirtualAllocator |
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16 | { |
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17 | private: |
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18 | SIZE_T m_nGranularity; |
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19 | |
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20 | public: |
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21 | // CGlobalVirtualAllocator |
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22 | CGlobalVirtualAllocator() throw() : |
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23 | m_nGranularity(4 << 10) // 4L |
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24 | { |
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25 | PERFORMANCE_INFORMATION Information; |
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26 | ZeroMemory(&Information, sizeof Information); |
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27 | ATLVERIFY(GetPerformanceInfo(&Information, sizeof Information)); |
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28 | m_nGranularity = Information.PageSize; |
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29 | ATLASSERT(m_nGranularity); |
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30 | ATLASSERT(!(m_nGranularity & (m_nGranularity - 1))); |
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31 | } |
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32 | SIZE_T GetGranularity() const throw() |
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33 | { |
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34 | return m_nGranularity; |
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35 | } |
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36 | }; |
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37 | |
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38 | CGlobalVirtualAllocator g_GlobalVirtualAllocator; |
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39 | |
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40 | //////////////////////////////////////////////////////////// |
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41 | // CVirtualAllocator |
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42 | |
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43 | class CVirtualAllocator |
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44 | { |
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45 | public: |
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46 | // CVirtualAllocator |
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47 | static SIZE_T Align(SIZE_T nDataSize) throw() |
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48 | { |
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49 | const SIZE_T nGranularity = g_GlobalVirtualAllocator.GetGranularity(); |
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50 | ATLASSERT(nGranularity); |
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51 | ATLASSERT(!(nGranularity & (nGranularity - 1))); |
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52 | return (nDataSize + nGranularity - 1) & ~(nGranularity - 1); |
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53 | } |
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54 | static VOID* Reallocate(_In_opt_ VOID* pvData, _In_ SIZE_T nDataSize) |
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55 | { |
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56 | MEMORY_BASIC_INFORMATION DataInformation; |
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57 | if(pvData) |
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58 | { |
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59 | ATLVERIFY(VirtualQuery(pvData, &DataInformation, sizeof DataInformation)); |
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60 | if(nDataSize <= DataInformation.RegionSize) |
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61 | return pvData; |
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62 | } |
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63 | VOID* pvNewData = NULL; |
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64 | if(nDataSize) |
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65 | { |
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66 | pvNewData = VirtualAlloc(NULL, Align(nDataSize), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); |
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67 | ATLENSURE_THROW(pvNewData, AtlHresultFromLastError()); |
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68 | _ATLTRY |
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69 | { |
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70 | ATLENSURE_THROW(VirtualLock(pvNewData, nDataSize), AtlHresultFromLastError()); |
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71 | if(pvNewData && pvData) |
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72 | { |
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73 | ATLASSERT(DataInformation.AllocationProtect == PAGE_READWRITE); |
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74 | SIZE_T nCopyDataSize = nDataSize; |
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75 | if(nCopyDataSize > DataInformation.RegionSize) |
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76 | nCopyDataSize = DataInformation.RegionSize; |
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77 | Checked::memcpy_s(pvNewData, nDataSize, pvData, nCopyDataSize); |
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78 | } |
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79 | } |
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80 | _ATLCATCHALL() |
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81 | { |
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82 | Free(pvData); |
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83 | _ATLRETHROW; |
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84 | } |
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85 | } |
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86 | if(pvData) |
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87 | Free(pvData); |
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88 | return pvNewData; |
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89 | } |
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90 | static VOID* Allocate(_In_ SIZE_T nDataSize) |
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91 | { |
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92 | if(!nDataSize) |
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93 | return NULL; |
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94 | VOID* pvData = VirtualAlloc(NULL, Align(nDataSize), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); |
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95 | ATLENSURE_THROW(pvData, AtlHresultFromLastError()); |
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96 | _ATLTRY |
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97 | { |
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98 | ATLENSURE_THROW(VirtualLock(pvData, nDataSize), AtlHresultFromLastError()); |
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99 | } |
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100 | _ATLCATCHALL() |
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101 | { |
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102 | Free(pvData); |
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103 | _ATLRETHROW; |
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104 | } |
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105 | return pvData; |
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106 | } |
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107 | static VOID Free(_In_opt_ VOID* pvData) throw() |
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108 | { |
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109 | if(!pvData) |
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110 | return; |
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111 | //VirtualUnlock(pvData, |
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112 | ATLVERIFY(VirtualFree(pvData, 0, MEM_RELEASE)); |
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113 | } |
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114 | }; |
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115 | |
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116 | //////////////////////////////////////////////////////////// |
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117 | // CVirtualHeapPtr |
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118 | |
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119 | template <typename T> |
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120 | class CVirtualHeapPtr : |
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121 | public CHeapPtr<T, CVirtualAllocator> |
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122 | { |
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123 | public: |
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124 | // CVirtualHeapPtr |
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125 | CVirtualHeapPtr() throw() |
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126 | { |
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127 | } |
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128 | explicit CVirtualHeapPtr(_In_ T* pData) throw() : |
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129 | CHeapPtr<T, CVirtualAllocator>(pData) |
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130 | { |
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131 | } |
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132 | VOID SetProtection(DWORD nProtection) |
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133 | { |
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134 | if(!m_pData) |
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135 | return; |
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136 | MEMORY_BASIC_INFORMATION DataInformation; |
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137 | ATLENSURE_THROW(VirtualQuery(m_pData, &DataInformation, sizeof DataInformation), AtlHresultFromLastError()); |
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138 | DWORD nCurrentProtection; |
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139 | ATLENSURE_THROW(VirtualProtect(m_pData, DataInformation.RegionSize, nProtection, &nCurrentProtection), AtlHresultFromLastError()); |
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140 | } |
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141 | }; |
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142 | |
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143 | //////////////////////////////////////////////////////////// |
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144 | // Main |
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145 | |
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146 | int _tmain(int argc, _TCHAR* argv[]) |
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147 | { |
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148 | CVirtualHeapPtr<BYTE> p; |
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149 | p.Allocate(1); |
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150 | p[0] = 0x01; |
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151 | _tprintf(_T("p[0] 0x%02X\n"), p[0]); |
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152 | ATLVERIFY(p.Reallocate(2)); |
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153 | p[1] = 0x02; |
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154 | _tprintf(_T("p[0] 0x%02X, p[1] 0x%02X\n"), p[0], p[1]); |
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155 | p[0] = 0x03; |
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156 | _tprintf(_T("p[0] 0x%02X, p[1] 0x%02X\n"), p[0], p[1]); |
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157 | if(FALSE) |
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158 | { |
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159 | p.SetProtection(PAGE_READONLY); |
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160 | _ATLTRY |
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161 | { |
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162 | p[1] = 0x04; |
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163 | _tprintf(_T("p[0] 0x%02X, p[1] 0x%02X\n"), p[0], p[1]); |
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164 | } |
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165 | _ATLCATCHALL() |
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166 | { |
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167 | _tprintf(_T("Oopsie in line %d\n"), __LINE__); |
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168 | } |
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169 | p.SetProtection(PAGE_READWRITE); |
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170 | p[1] = 0x05; |
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171 | _tprintf(_T("p[0] 0x%02X, p[1] 0x%02X\n"), p[0], p[1]); |
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172 | } |
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173 | p.SetProtection(PAGE_READWRITE | PAGE_GUARD); |
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174 | volatile BYTE n; |
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175 | _ATLTRY |
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176 | { |
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177 | n = p[0]; |
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178 | } |
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179 | _ATLCATCHALL() |
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180 | { |
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181 | _tprintf(_T("Oopsie in line %d\n"), __LINE__); |
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182 | } |
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183 | _ATLTRY |
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184 | { |
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185 | n = p[1]; |
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186 | } |
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187 | _ATLCATCHALL() |
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188 | { |
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189 | _tprintf(_T("Oopsie in line %d\n"), __LINE__); |
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190 | } |
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191 | return 0; |
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192 | } |
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193 | |
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