1 files changed, 348 insertions, 0 deletions
diff --git a/NorthstarDLL/memory.cpp b/NorthstarDLL/memory.cpp
new file mode 100644
index 00000000..2e994fb2
--- /dev/null
+++ b/NorthstarDLL/memory.cpp
@@ -0,0 +1,348 @@
+#include "pch.h"
+#include "memory.h"
+
+MemoryAddress::MemoryAddress() : m_nAddress(0) {}
+MemoryAddress::MemoryAddress(const uintptr_t nAddress) : m_nAddress(nAddress) {}
+MemoryAddress::MemoryAddress(const void* pAddress) : m_nAddress(reinterpret_cast<uintptr_t>(pAddress)) {}
+
+// operators
+MemoryAddress::operator uintptr_t() const
+{
+	return m_nAddress;
+}
+
+MemoryAddress::operator void*() const
+{
+	return reinterpret_cast<void*>(m_nAddress);
+}
+
+MemoryAddress::operator bool() const
+{
+	return m_nAddress != 0;
+}
+
+bool MemoryAddress::operator==(const MemoryAddress& other) const
+{
+	return m_nAddress == other.m_nAddress;
+}
+
+bool MemoryAddress::operator!=(const MemoryAddress& other) const
+{
+	return m_nAddress != other.m_nAddress;
+}
+
+bool MemoryAddress::operator==(const uintptr_t& addr) const
+{
+	return m_nAddress == addr;
+}
+
+bool MemoryAddress::operator!=(const uintptr_t& addr) const
+{
+	return m_nAddress != addr;
+}
+
+MemoryAddress MemoryAddress::operator+(const MemoryAddress& other) const
+{
+	return Offset(other.m_nAddress);
+}
+
+MemoryAddress MemoryAddress::operator-(const MemoryAddress& other) const
+{
+	return MemoryAddress(m_nAddress - other.m_nAddress);
+}
+
+MemoryAddress MemoryAddress::operator+(const uintptr_t& addr) const
+{
+	return Offset(addr);
+}
+
+MemoryAddress MemoryAddress::operator-(const uintptr_t& addr) const
+{
+	return MemoryAddress(m_nAddress - addr);
+}
+
+MemoryAddress MemoryAddress::operator*() const
+{
+	return Deref();
+}
+
+// traversal
+MemoryAddress MemoryAddress::Offset(const uintptr_t nOffset) const
+{
+	return MemoryAddress(m_nAddress + nOffset);
+}
+
+MemoryAddress MemoryAddress::Deref(const int nNumDerefs) const
+{
+	uintptr_t ret = m_nAddress;
+	for (int i = 0; i < nNumDerefs; i++)
+		ret = *reinterpret_cast<uintptr_t*>(ret);
+
+	return MemoryAddress(ret);
+}
+
+// patching
+void MemoryAddress::Patch(const uint8_t* pBytes, const size_t nSize)
+{
+	if (nSize)
+		WriteProcessMemory(GetCurrentProcess(), reinterpret_cast<LPVOID>(m_nAddress), pBytes, nSize, NULL);
+}
+
+void MemoryAddress::Patch(const std::initializer_list<uint8_t> bytes)
+{
+	uint8_t* pBytes = new uint8_t[bytes.size()];
+
+	int i = 0;
+	for (const uint8_t& byte : bytes)
+		pBytes[i++] = byte;
+
+	Patch(pBytes, bytes.size());
+	delete[] pBytes;
+}
+
+inline std::vector<uint8_t> HexBytesToString(const char* pHexString)
+{
+	std::vector<uint8_t> ret;
+
+	int size = strlen(pHexString);
+	for (int i = 0; i < size; i++)
+	{
+		// If this is a space character, ignore it
+		if (isspace(pHexString[i]))
+			continue;
+
+		if (i < size - 1)
+		{
+			BYTE result = 0;
+			for (int j = 0; j < 2; j++)
+			{
+				int val = 0;
+				char c = *(pHexString + i + j);
+				if (c >= 'a')
+				{
+					val = c - 'a' + 0xA;
+				}
+				else if (c >= 'A')
+				{
+					val = c - 'A' + 0xA;
+				}
+				else if (isdigit(c))
+				{
+					val = c - '0';
+				}
+				else
+				{
+					assert(false, "Failed to parse invalid hex string.");
+					val = -1;
+				}
+
+				result += (j == 0) ? val * 16 : val;
+			}
+			ret.push_back(result);
+		}
+
+		i++;
+	}
+
+	return ret;
+}
+
+void MemoryAddress::Patch(const char* pBytes)
+{
+	std::vector<uint8_t> vBytes = HexBytesToString(pBytes);
+	Patch(vBytes.data(), vBytes.size());
+}
+
+void MemoryAddress::NOP(const size_t nSize)
+{
+	uint8_t* pBytes = new uint8_t[nSize];
+
+	memset(pBytes, 0x90, nSize);
+	Patch(pBytes, nSize);
+
+	delete[] pBytes;
+}
+
+bool MemoryAddress::IsMemoryReadable(const size_t nSize)
+{
+	static SYSTEM_INFO sysInfo;
+	if (!sysInfo.dwPageSize)
+		GetSystemInfo(&sysInfo);
+
+	MEMORY_BASIC_INFORMATION memInfo;
+	if (!VirtualQuery(reinterpret_cast<LPCVOID>(m_nAddress), &memInfo, sizeof(memInfo)))
+		return false;
+
+	return memInfo.RegionSize >= nSize && memInfo.State & MEM_COMMIT && !(memInfo.Protect & PAGE_NOACCESS);
+}
+
+CModule::CModule(const HMODULE pModule)
+{
+	MODULEINFO mInfo {0};
+
+	if (pModule && pModule != INVALID_HANDLE_VALUE)
+		GetModuleInformation(GetCurrentProcess(), pModule, &mInfo, sizeof(MODULEINFO));
+
+	m_nModuleSize = static_cast<size_t>(mInfo.SizeOfImage);
+	m_pModuleBase = reinterpret_cast<uintptr_t>(mInfo.lpBaseOfDll);
+	m_nAddress = m_pModuleBase;
+
+	if (!m_nModuleSize || !m_pModuleBase)
+		return;
+
+	m_pDOSHeader = reinterpret_cast<IMAGE_DOS_HEADER*>(m_pModuleBase);
+	m_pNTHeaders = reinterpret_cast<IMAGE_NT_HEADERS64*>(m_pModuleBase + m_pDOSHeader->e_lfanew);
+
+	const IMAGE_SECTION_HEADER* hSection = IMAGE_FIRST_SECTION(m_pNTHeaders); // Get first image section.
+
+	for (WORD i = 0; i < m_pNTHeaders->FileHeader.NumberOfSections; i++) // Loop through the sections.
+	{
+		const IMAGE_SECTION_HEADER& hCurrentSection = hSection[i]; // Get current section.
+
+		ModuleSections_t moduleSection = ModuleSections_t(
+			std::string(reinterpret_cast<const char*>(hCurrentSection.Name)),
+			static_cast<uintptr_t>(m_pModuleBase + hCurrentSection.VirtualAddress),
+			hCurrentSection.SizeOfRawData);
+
+		if (!strcmp((const char*)hCurrentSection.Name, ".text"))
+			m_ExecutableCode = moduleSection;
+		else if (!strcmp((const char*)hCurrentSection.Name, ".pdata"))
+			m_ExceptionTable = moduleSection;
+		else if (!strcmp((const char*)hCurrentSection.Name, ".data"))
+			m_RunTimeData = moduleSection;
+		else if (!strcmp((const char*)hCurrentSection.Name, ".rdata"))
+			m_ReadOnlyData = moduleSection;
+
+		m_vModuleSections.push_back(moduleSection); // Push back a struct with the section data.
+	}
+}
+
+CModule::CModule(const char* pModuleName) : CModule(GetModuleHandleA(pModuleName)) {}
+
+MemoryAddress CModule::GetExport(const char* pExportName)
+{
+	return MemoryAddress(reinterpret_cast<uintptr_t>(GetProcAddress(reinterpret_cast<HMODULE>(m_nAddress), pExportName)));
+}
+
+MemoryAddress CModule::FindPattern(const uint8_t* pPattern, const char* pMask)
+{
+	if (!m_ExecutableCode.IsSectionValid())
+		return MemoryAddress();
+
+	uint64_t nBase = static_cast<uint64_t>(m_ExecutableCode.m_pSectionBase);
+	uint64_t nSize = static_cast<uint64_t>(m_ExecutableCode.m_nSectionSize);
+
+	const uint8_t* pData = reinterpret_cast<uint8_t*>(nBase);
+	const uint8_t* pEnd = pData + static_cast<uint32_t>(nSize) - strlen(pMask);
+
+	int nMasks[64]; // 64*16 = enough masks for 1024 bytes.
+	int iNumMasks = static_cast<int>(ceil(static_cast<float>(strlen(pMask)) / 16.f));
+
+	memset(nMasks, '\0', iNumMasks * sizeof(int));
+	for (intptr_t i = 0; i < iNumMasks; ++i)
+	{
+		for (intptr_t j = strnlen(pMask + i * 16, 16) - 1; j >= 0; --j)
+		{
+			if (pMask[i * 16 + j] == 'x')
+			{
+				_bittestandset(reinterpret_cast<LONG*>(&nMasks[i]), j);
+			}
+		}
+	}
+	__m128i xmm1 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(pPattern));
+	__m128i xmm2, xmm3, msks;
+	for (; pData != pEnd; _mm_prefetch(reinterpret_cast<const char*>(++pData + 64), _MM_HINT_NTA))
+	{
+		if (pPattern[0] == pData[0])
+		{
+			xmm2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(pData));
+			msks = _mm_cmpeq_epi8(xmm1, xmm2);
+			if ((_mm_movemask_epi8(msks) & nMasks[0]) == nMasks[0])
+			{
+				for (uintptr_t i = 1; i < static_cast<uintptr_t>(iNumMasks); ++i)
+				{
+					xmm2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>((pData + i * 16)));
+					xmm3 = _mm_loadu_si128(reinterpret_cast<const __m128i*>((pPattern + i * 16)));
+					msks = _mm_cmpeq_epi8(xmm2, xmm3);
+					if ((_mm_movemask_epi8(msks) & nMasks[i]) == nMasks[i])
+					{
+						if ((i + 1) == iNumMasks)
+						{
+							return MemoryAddress(const_cast<uint8_t*>(pData));
+						}
+					}
+					else
+						goto CONTINUE;
+				}
+
+				return MemoryAddress((&*(const_cast<uint8_t*>(pData))));
+			}
+		}
+
+	CONTINUE:;
+	}
+
+	return MemoryAddress();
+}
+
+inline std::pair<std::vector<uint8_t>, std::string> MaskedBytesFromPattern(const char* pPatternString)
+{
+	std::vector<uint8_t> vRet;
+	std::string sMask;
+
+	int size = strlen(pPatternString);
+	for (int i = 0; i < size; i++)
+	{
+		// If this is a space character, ignore it
+		if (isspace(pPatternString[i]))
+			continue;
+
+		if (pPatternString[i] == '?')
+		{
+			// Add a wildcard
+			vRet.push_back(0);
+			sMask.append("?");
+		}
+		else if (i < size - 1)
+		{
+			BYTE result = 0;
+			for (int j = 0; j < 2; j++)
+			{
+				int val = 0;
+				char c = *(pPatternString + i + j);
+				if (c >= 'a')
+				{
+					val = c - 'a' + 0xA;
+				}
+				else if (c >= 'A')
+				{
+					val = c - 'A' + 0xA;
+				}
+				else if (isdigit(c))
+				{
+					val = c - '0';
+				}
+				else
+				{
+					assert(false, "Failed to parse invalid pattern string.");
+					val = -1;
+				}
+
+				result += (j == 0) ? val * 16 : val;
+			}
+
+			vRet.push_back(result);
+			sMask.append("x");
+		}
+
+		i++;
+	}
+
+	return std::make_pair(vRet, sMask);
+}
+
+MemoryAddress CModule::FindPattern(const char* pPattern)
+{
+	const auto pattern = MaskedBytesFromPattern(pPattern);
+	return FindPattern(pattern.first.data(), pattern.second.c_str());
+}