Offsets.cpp

Go to the documentation of this file.

#include "Offsets.h"
#include "Logger/Logger.h"
 
namespace API
{
    Offsets::Offsets()
    {
        module_base_ = data_base_ = reinterpret_cast<DWORD64>(GetModuleHandle(nullptr));
 
        const auto dos_header = reinterpret_cast<PIMAGE_DOS_HEADER>(module_base_);
        const auto nt_headers = reinterpret_cast<PIMAGE_NT_HEADERS>(module_base_ + dos_header->e_lfanew);
 
        module_base_ += nt_headers->OptionalHeader.BaseOfCode;
 
        // get base of .data section
        const auto section_count = nt_headers->FileHeader.NumberOfSections;
        const auto first_section = IMAGE_FIRST_SECTION(nt_headers);
        const auto end_section = first_section + section_count;
 
        const auto data_section_header = std::find_if(first_section, end_section, [](_IMAGE_SECTION_HEADER hdr)
        {
            auto name = std::string(reinterpret_cast<char*>(hdr.Name), 8);
            name.erase(std::remove(name.begin(), name.end(), '\0'), name.end());
 
            return name == ".data";
        });
 
        if (data_section_header == end_section)
        {
            Log::GetLog()->error("Failed to get the base of the .data section.");
            throw;
        }
 
        data_base_ += data_section_header->VirtualAddress;
    }
 
    Offsets& Offsets::Get()
    {
        static Offsets instance;
        return instance;
    }
 
    void Offsets::Init(std::unordered_map<std::string, intptr_t>&& offsets_dump,
                       std::unordered_map<std::string, BitField>&& bitfields_dump)
    {
        offsets_dump_.swap(offsets_dump);
        bitfields_dump_.swap(bitfields_dump);
    }
 
    DWORD64 Offsets::GetAddress(const void* base, const std::string& name)
    {
        return reinterpret_cast<DWORD64>(base) + static_cast<DWORD64>(offsets_dump_[name]);
    }
 
    LPVOID Offsets::GetAddress(const std::string& name)
    {
        return reinterpret_cast<LPVOID>(module_base_ + static_cast<DWORD64>(offsets_dump_[name]));
    }
 
    LPVOID Offsets::GetDataAddress(const std::string& name)
    {
        return reinterpret_cast<LPVOID>(data_base_ + static_cast<DWORD64>(offsets_dump_[name]));
    }
 
    BitField Offsets::GetBitField(const void* base, const std::string& name)
    {
        return GetBitFieldInternal(base, name);
    }
 
    BitField Offsets::GetBitField(LPVOID base, const std::string& name)
    {
        return GetBitFieldInternal(base, name);
    }
 
    BitField Offsets::GetBitFieldInternal(const void* base, const std::string& name)
    {
        const auto bf = bitfields_dump_[name];
        auto cf = BitField();
        cf.bit_position = bf.bit_position;
        cf.length = bf.length;
        cf.num_bits = bf.num_bits;
        cf.offset = reinterpret_cast<DWORD64>(base) + static_cast<DWORD64>(bf.offset);
 
        return cf;
    }
} // namespace API