65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
#ifndef PE_HPP
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#define PE_HPP
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#include "common.hpp"
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#if IS_WINDOWS
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#include <array>
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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#include <string>
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#include <windows.h>
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template<typename T, typename std::enable_if<std::is_integral<T>::value, int>::type = 0>
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T pe_byteswap_if_needed(T value) {
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// PE header values are little endian
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if(!is_little_endian()) {
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return byteswap(value);
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} else {
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return value;
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}
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}
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static uintptr_t pe_get_module_image_base(const std::string& obj_path) {
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FILE* file;
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errno_t ret = fopen_s(&file, obj_path.c_str(), "rb");
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if(ret != 0 || file == nullptr) {
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throw file_error();
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return 0;
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}
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auto magic = load_bytes<std::array<char, 2>>(file, 0);
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internal_verify(memcmp(magic.data(), "MZ", 2) == 0);
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DWORD e_lfanew = pe_byteswap_if_needed(load_bytes<DWORD>(file, 0x3c)); // dos header + 0x3c
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long nt_header_offset = e_lfanew;
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auto signature = load_bytes<std::array<char, 4>>(file, nt_header_offset); // nt header + 0
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internal_verify(memcmp(signature.data(), "PE\0\0", 4) == 0);
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WORD size_of_optional_header = pe_byteswap_if_needed(
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load_bytes<WORD>(file, nt_header_offset + 4 + 0x10) // file header + 0x10
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);
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internal_verify(size_of_optional_header != 0);
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WORD optional_header_magic = pe_byteswap_if_needed(
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load_bytes<WORD>(file, nt_header_offset + 0x18) // optional header + 0x0
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);
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internal_verify(optional_header_magic == IMAGE_NT_OPTIONAL_HDR_MAGIC);
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uintptr_t image_base;
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if(optional_header_magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
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// 32 bit
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image_base = pe_byteswap_if_needed(
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load_bytes<DWORD>(file, nt_header_offset + 0x18 + 0x1c) // optional header + 0x1c
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);
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} else {
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// 64 bit
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// I get an "error: 'QWORD' was not declared in this scope" for some reason when using QWORD
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image_base = pe_byteswap_if_needed(
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load_bytes<unsigned __int64>(file, nt_header_offset + 0x18 + 0x18) // optional header + 0x18
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);
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}
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fclose(file);
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return image_base;
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}
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#endif
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#endif
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