Adds PE scanner infrastructure and data structures

Initializes infrastructure for PE file scanning.

Adds data structures for PE headers (DOS, optional, section),
including user-defined types for section characteristics.

Refactors existing pattern scanning code to utilize new PE data structures.

Adds basic parsing of PE headers.

include/omath/system/pe/data_directory.hpp

@@ -0,0 +1,5 @@
+//
+// Created by Vlad on 10/8/2025.
+//
+
+#pragma once

include/omath/system/pe/optional_header.hpp

@@ -0,0 +1,5 @@
+//
+// Created by Vlad on 10/8/2025.
+//
+
+#pragma once

include/omath/system/pe/section_header.hpp

@@ -0,0 +1,62 @@
+//
+// Created by Vlad on 10/8/2025.
+//
+
+#pragma once
+#include <cstdint>
+union section_characteristics_t
+{
+    std::uint32_t flags;
+    struct
+    {
+        std::uint32_t _pad0 : 5;
+        std::uint32_t cnt_code : 1; // Section contains code.
+        std::uint32_t cnt_init_data : 1; // Section contains initialized data.
+        std::uint32_t cnt_uninit_data : 1; // Section contains uninitialized data.
+        std::uint32_t _pad1 : 1;
+        std::uint32_t lnk_info : 1; // Section contains comments or some other type of information.
+        std::uint32_t _pad2 : 1;
+        std::uint32_t lnk_remove : 1; // Section contents will not become part of image.
+        std::uint32_t lnk_comdat : 1; // Section contents comdat.
+        std::uint32_t _pad3 : 1;
+        std::uint32_t no_defer_spec_exc : 1; // Reset speculative exceptions handling bits in the TLB entries for this
+                                             // section.
+        std::uint32_t mem_far : 1;
+        std::uint32_t _pad4 : 1;
+        std::uint32_t mem_purgeable : 1;
+        std::uint32_t mem_locked : 1;
+        std::uint32_t mem_preload : 1;
+        std::uint32_t alignment : 4; // Alignment calculated as: n ? 1 << ( n - 1 ) : 16
+        std::uint32_t lnk_nreloc_ovfl : 1; // Section contains extended relocations.
+        std::uint32_t mem_discardable : 1; // Section can be discarded.
+        std::uint32_t mem_not_cached : 1; // Section is not cachable.
+        std::uint32_t mem_not_paged : 1; // Section is not pageable.
+        std::uint32_t mem_shared : 1; // Section is shareable.
+        std::uint32_t mem_execute : 1; // Section is executable.
+        std::uint32_t mem_read : 1; // Section is readable.
+        std::uint32_t mem_write : 1; // Section is writeable.
+    };
+};
+
+// Section header
+//
+struct section_header_t
+{
+    char name[8];
+    union
+    {
+        std::uint32_t physical_address;
+        std::uint32_t virtual_size;
+    };
+    std::uint32_t virtual_address;
+
+    std::uint32_t size_raw_data;
+    std::uint32_t ptr_raw_data;
+
+    std::uint32_t ptr_relocs;
+    std::uint32_t ptr_line_numbers;
+    uint16_t num_relocs;
+    uint16_t num_line_numbers;
+
+    section_characteristics_t characteristics;
+};

source/utility/pe_pattern_scan.cpp

@@ -2,11 +2,12 @@
 // Created by Vlad on 10/7/2025.
 //
 #include "omath/utility/pe_pattern_scan.hpp"
+#include "omath/system/pe/section_header.hpp"
 #include "omath/utility/pattern_scan.hpp"
 #include <fstream>
+#include <omath/system/pe/dos_header.hpp>
 #include <span>
 #include <stdexcept>
-
 #ifdef _WIN32
 #include <Windows.h>
 #endif
@@ -68,7 +69,7 @@ namespace omath
         if (!file.is_open()) [[unlikely]]
             return std::nullopt;
 
-        IMAGE_DOS_HEADER dos_header{};
+        system::pe::DosHeader dos_header{};
         file.read(reinterpret_cast<char*>(&dos_header), sizeof(dos_header));
 
         if (dos_header.e_magic != 0x5A4D) [[unlikely]]
@@ -86,20 +87,20 @@ namespace omath
         const auto offset_to_segment_table = dos_header.e_lfanew + nt_headers.FileHeader.SizeOfOptionalHeader
                                              + sizeof(IMAGE_FILE_HEADER) + size_of_signature;
 
-        file.seekg(offset_to_segment_table, std::ios::beg);
+        file.seekg(static_cast<std::fstream::off_type>(offset_to_segment_table), std::ios::beg);
 
-        for (size_t i = 0; i < nt_headers.FileHeader.NumberOfSections; i++)
+        for (std::size_t i = 0; i < nt_headers.FileHeader.NumberOfSections; i++)
         {
-            IMAGE_SECTION_HEADER current_section{};
+            section_header_t current_section{};
             file.read(reinterpret_cast<char*>(&current_section), sizeof(IMAGE_SECTION_HEADER));
 
-            if (std::string_view(reinterpret_cast<char*>(current_section.Name)) != section_name)
+            if (std::string_view(current_section.name) != section_name)
                 continue;
 
-            std::vector<std::byte> section_data(current_section.SizeOfRawData);
+            std::vector<std::byte> section_data(current_section.size_raw_data);
 
-            file.seekg(current_section.PointerToRawData, std::ios::beg);
+            file.seekg(current_section.ptr_raw_data, std::ios::beg);
-            file.read(reinterpret_cast<char*>(section_data.data()), section_data.size());
+            file.read(reinterpret_cast<char*>(section_data.data()), static_cast<std::streamsize>(section_data.size()));
 
             return section_data;
         }