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authorjbzdarkid <jbzdarkid@gmail.com>2018-10-24 18:44:37 -0700
committerjbzdarkid <jbzdarkid@gmail.com>2018-10-24 18:44:37 -0700
commit2473736979b829e09130a7261b38eb8c1367a06d (patch)
treea8fd86b1a464a96420bc7f4cf1028d0fb2d01b41 /WitnessRandomizer
parent922dbb03a50a54f3e5ae9efaec3b4759cd701c3e (diff)
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Perf: Cache memory offsets
Diffstat (limited to 'WitnessRandomizer')
-rw-r--r--WitnessRandomizer/Memory.cpp10
-rw-r--r--WitnessRandomizer/Memory.h2
2 files changed, 10 insertions, 2 deletions
diff --git a/WitnessRandomizer/Memory.cpp b/WitnessRandomizer/Memory.cpp index c5852ac..f2bd8f1 100644 --- a/WitnessRandomizer/Memory.cpp +++ b/WitnessRandomizer/Memory.cpp
@@ -58,16 +58,22 @@ void Memory::ThrowError() {
58 58
59uintptr_t Memory::ComputeOffset(std::vector<int> offsets) 59uintptr_t Memory::ComputeOffset(std::vector<int> offsets)
60{ 60{
61 uintptr_t cumulativeAddress = _baseAddress;
62
63 // Leave off the last offset, since it will be either read/write, and may not be of type unitptr_t. 61 // Leave off the last offset, since it will be either read/write, and may not be of type unitptr_t.
64 int final_offset = offsets.back(); 62 int final_offset = offsets.back();
65 offsets.pop_back(); 63 offsets.pop_back();
64
65 auto search = _computedOffsets.find(offsets);
66 if (search != std::end(_computedOffsets)) {
67 return search->second + final_offset;
68 }
69
70 uintptr_t cumulativeAddress = _baseAddress;
66 for (int offset : offsets) { 71 for (int offset : offsets) {
67 cumulativeAddress += offset; 72 cumulativeAddress += offset;
68 if (!ReadProcessMemory(_handle, (LPVOID)cumulativeAddress, &cumulativeAddress, sizeof(uintptr_t), NULL)) { 73 if (!ReadProcessMemory(_handle, (LPVOID)cumulativeAddress, &cumulativeAddress, sizeof(uintptr_t), NULL)) {
69 ThrowError(); 74 ThrowError();
70 } 75 }
71 } 76 }
77 _computedOffsets[offsets] = cumulativeAddress;
72 return cumulativeAddress + final_offset; 78 return cumulativeAddress + final_offset;
73} 79}
diff --git a/WitnessRandomizer/Memory.h b/WitnessRandomizer/Memory.h index 6882c9c..dc92349 100644 --- a/WitnessRandomizer/Memory.h +++ b/WitnessRandomizer/Memory.h
@@ -40,6 +40,8 @@ private:
40 void ThrowError(); 40 void ThrowError();
41 41
42 uintptr_t ComputeOffset(std::vector<int> offsets); 42 uintptr_t ComputeOffset(std::vector<int> offsets);
43
44 std::map<std::vector<int>, uintptr_t> _computedOffsets;
43 uintptr_t _baseAddress; 45 uintptr_t _baseAddress;
44 HANDLE _handle; 46 HANDLE _handle;
45}; \ No newline at end of file 47}; \ No newline at end of file