Find the EAT slot of a given function

FindFuncEATSlot.cpp

//-------------------------------------------------------------------------
PDWORD FindFuncEATAddressSlot(
    HMODULE hModule,
    LPCSTR FuncName)
{
    if (hModule == nullptr)
        return nullptr;

    ULONG_PTR Base = ULONG_PTR(hModule);

    IMAGE_DOS_HEADER *idh = (IMAGE_DOS_HEADER *)hModule;
    if (idh->e_magic != IMAGE_DOS_SIGNATURE)
        return 0;

    auto inh = PIMAGE_NT_HEADERS(Base + idh->e_lfanew);
    if (inh->Signature != IMAGE_NT_SIGNATURE) 
        return 0;

    IMAGE_DATA_DIRECTORY *edd = inh->OptionalHeader.DataDirectory + IMAGE_DIRECTORY_ENTRY_EXPORT;

    // No export table
    if (edd->VirtualAddress == 0)
        return nullptr;

    PIMAGE_EXPORT_DIRECTORY ead = 
        (PIMAGE_EXPORT_DIRECTORY)(Base + edd->VirtualAddress);

    // Parallel arrays. Finding the name in the names table will let us
    // use that index in the ordinal table to get the real index into the
    // function address table.
    PDWORD pNameRVA    = PDWORD(Base + ead->AddressOfNames);
    PWORD  pNameOrdRVA = PWORD(Base + ead->AddressOfNameOrdinals);

    // Base array of function addresses RVAs
    PDWORD pFuncAddrRVAs = PDWORD(Base + ead->AddressOfFunctions);

    for (DWORD i = 0, c = ead->NumberOfNames; 
         i < c; 
         ++i, ++pNameRVA, ++pNameOrdRVA)
    {
        auto Name = (const char *)(Base + *pNameRVA);

        if (strcmp(Name, FuncName) != 0)
            continue;

        return pFuncAddrRVAs + *pNameOrdRVA;
    }
    return nullptr;
}