DNF_DLL/test/inlinehook.h

#pragma once

constexpr int Byte_Length = 6;

class inlinehook
{
private:
	using uchar = unsigned char;

	//ԭʼ<D4AD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD>ָ<EFBFBD><D6B8>
	uchar m_original_byte[Byte_Length];
	//<2F><><EFBFBD>ǹ<EFBFBD><C7B9><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD>ָ<EFBFBD><D6B8>
	uchar m_self_byte[Byte_Length];

	//ԭʼ<D4AD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ
	int m_original_address;
	//<2F><><EFBFBD>Ǻ<EFBFBD><C7BA><EFBFBD><EFBFBD><EFBFBD>ַ
	int m_self_address;

	DWORD Motify_memory_attributes(int address, DWORD attributes = PAGE_EXECUTE_READWRITE);


public:

	inlinehook(int original_address, int self_address):m_original_address(original_address), m_self_address(self_address)
	{
		//<2F><><EFBFBD><EFBFBD>jmp
		m_self_byte[0] = '\xe9';
		//<2F><><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB>
		int offset = self_address - (original_address + Byte_Length);

		//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD><EFBFBD>ǵĺ<C7B5><C4BA><EFBFBD>BYTE
		memcpy(&m_self_byte[1], &offset, Byte_Length - 2);

		m_self_byte[5] = '\x90';
		//<2F>޸<EFBFBD><DEB8>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD>
		DWORD attributes = Motify_memory_attributes(original_address);

		//<2F><><EFBFBD><EFBFBD>ԭʼ<D4AD>ĺ<EFBFBD><C4BA><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7>BYTE
		memcpy(&m_original_byte, reinterpret_cast<void*>(original_address), Byte_Length);

		//<2F>ָ<EFBFBD><D6B8>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD>
		Motify_memory_attributes(original_address, attributes);
	}


	//<2F>޸ĵ<DEB8>ַ
	void Motify_address();

	//<2F><>ԭ<EFBFBD><D4AD>ַ
	void Restore_address();
};