diff --git a/include/theo/engine.hpp b/include/theo/engine.hpp
new file mode 100644
index 0000000..559564e
--- /dev/null
+++ b/include/theo/engine.hpp
@@ -0,0 +1,54 @@
+#include <coff/archive.hpp>
+#include <coff/image.hpp>
+#include <theo/obf_pass.hpp>
+
+namespace theo
+{
+    class engine_t
+    {
+        class swapchain_t
+        {
+            std::vector< std::uint8_t > front, back;
+            std::vector< std::vector< std::uint8_t > > objs;
+
+          public:
+            class iff_t
+            {
+                /// <summary>
+                /// swapchain_t is the only one who needs to call iff_t::flush...
+                /// so its a friend class... flush is also private...
+                /// </summary>
+                friend class swapchain_t;
+
+              public:
+                struct section_t
+                {
+                    coff::section_header_t header;
+                    std::vector< std::pair< std::uint32_t, coff::symbol_t > > symbols;
+                };
+
+                explicit iff_t( coff::image_t *img );
+                std::vector< section_t > sections;
+
+              private:
+                /// <summary>
+                /// flush changes from "sections" back to img...
+                /// </summary>
+                void flush();
+                coff::image_t *img;
+            };
+            explicit swapchain_t( const std::vector< std::uint8_t > &img );
+            std::shared_ptr< swapchain_t > make( const std::vector< std::uint8_t > &img );
+            void swap( std::vector< iff_t > &iffs );
+        };
+
+      public:
+        explicit engine_t( const std::vector< std::uint8_t > &lib_img );
+        void add_pass( const obf_pass_t &pass );
+        void run( std::vector< std::uint8_t > &result );
+
+      private:
+        swapchain_t swap;
+        std::vector< theo::obf_pass_t > passes;
+    };
+} // namespace theo
\ No newline at end of file
diff --git a/include/theo/obf_pass.hpp b/include/theo/obf_pass.hpp
new file mode 100644
index 0000000..2a176c2
--- /dev/null
+++ b/include/theo/obf_pass.hpp
@@ -0,0 +1,23 @@
+#include <xtils.hpp>
+#include <theo/symbol.hpp>
+
+namespace theo
+{
+    class obf_pass_t
+    {
+        friend class engine_t;
+
+      public:
+        enum class lvl_t
+        {
+            l_section,
+            l_function,
+            l_instr
+        };
+        obf_pass_t( const lvl_t &pass_lvl );
+
+      private:
+        virtual void callback() = 0;
+        lvl_t lvl;
+    };
+} // namespace theo
\ No newline at end of file
diff --git a/include/theo/symbol.hpp b/include/theo/symbol.hpp
new file mode 100644
index 0000000..bec3c2f
--- /dev/null
+++ b/include/theo/symbol.hpp
@@ -0,0 +1,10 @@
+#include <xtils.hpp>
+
+namespace llo
+{
+	class symbol_t
+    {
+      public:
+
+    };
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 40ab3c7..757d7e6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2,6 +2,7 @@
 #include <cli-parser.hpp>
 #include <coff/archive.hpp>
 #include <coff/image.hpp>
+#include <theo/engine.hpp>
 #include <xtils.hpp>
 
 int __cdecl main( int argc, const char *argv[] )
@@ -27,23 +28,7 @@ int __cdecl main( int argc, const char *argv[] )
 
     std::vector< std::uint8_t > lib;
     umtils->open_binary_file( cli_parser.get< std::string >( "i" ), lib );
-    ar::view lib_view( lib.data(), lib.size() );
 
-    const auto &symbol_map = lib_view.read_symbols();
-    for ( auto itr = lib_view.begin(); itr != lib_view.end(); ++itr )
-    {
-        std::printf( "> itr->to_string = %s\n", itr->to_string( lib_view.string_table ).data() );
-
-        auto coff_img = reinterpret_cast< coff::image_t * >( itr->data() );
-        std::printf( "> number of sections = %d\n", coff_img->file_header.num_sections );
-
-        for ( auto idx = 0u; idx < coff_img->file_header.num_sections; ++idx )
-        {
-            if ( coff_img->get_section( idx )->is_discardable() )
-                continue;
-
-            std::printf( "> section name = %s\n",
-                         coff_img->get_section( idx )->name.to_string( coff_img->get_strings() ).data() );
-        }
-    }
+    theo::engine_t theo( lib );
+    //theo.add_pass( { theo::obf_pass_t::lvl_t::l_function } );
 }
\ No newline at end of file
diff --git a/src/theo/engine.cpp b/src/theo/engine.cpp
new file mode 100644
index 0000000..eb1a8b2
--- /dev/null
+++ b/src/theo/engine.cpp
@@ -0,0 +1,49 @@
+#include <theo/engine.hpp>
+
+namespace theo
+{
+    engine_t::swapchain_t::iff_t::iff_t( coff::image_t *img )
+    {
+        // add sections to iff...
+        std::for_each( img->get_sections(), img->get_sections() + img->file_header.num_sections,
+                       [ & ]( const coff::section_header_t &section_header ) {
+                           sections.emplace_back( section_header );
+
+                           // add symbols to section...
+                           const auto num_symbols = img->file_header.num_symbols;
+                           for ( auto idx = 0u; idx < num_symbols; ++idx )
+                               // important to note that we are making a COPY of this symbol...
+                               sections.back().symbols.push_back( { idx, *img->get_symbol( idx ) } );
+                       } );
+    }
+
+    void engine_t::swapchain_t::iff_t::flush()
+    {
+        // for each section, loop over symbols to see if they have changed...
+        std::for_each( sections.begin(), sections.end(), [ & ]( const iff_t::section_t &iff_section ) {
+            std::for_each( iff_section.symbols.begin(), iff_section.symbols.end(), [ & ]( const auto &symbol_data ) {
+                const auto &[ symbol_idx, symbol ] = symbol_data;
+                img->get_symbol( symbol_idx )->value = symbol.value;
+            } );
+        } );
+    }
+
+    engine_t::swapchain_t::swapchain_t( const std::vector< std::uint8_t > &img ) : front( img ), back( img )
+    {
+        ar::view lib( front.data(), front.size() );
+        // extract obj files from lib archive...
+        std::for_each( lib.begin(), lib.end(), [ & ]( const auto &coff_data ) {
+            const auto &[ coff_name, coff_img ] = coff_data;
+            objs.push_back( { coff_img.begin(), coff_img.end() } );
+        } );
+    }
+
+    std::shared_ptr< engine_t::swapchain_t > engine_t::swapchain_t::make( const std::vector< std::uint8_t > &img )
+    {
+        return std::make_shared< engine_t::swapchain_t >( img );
+    }
+
+    engine_t::engine_t( const std::vector< std::uint8_t > &lib_img ) : swap{ lib_img }
+    {
+    }
+} // namespace theo
\ No newline at end of file
diff --git a/theodosius.vcxproj b/theodosius.vcxproj
index 8c957ad..009a93f 100644
--- a/theodosius.vcxproj
+++ b/theodosius.vcxproj
@@ -12,6 +12,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\main.cpp" />
+    <ClCompile Include="src\theo\engine.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include=".clang-format" />
@@ -86,6 +87,9 @@
     <ClInclude Include="dependencies\xed\include\public\xed\xed-util.h" />
     <ClInclude Include="dependencies\xed\include\public\xed\xed-version.h" />
     <ClInclude Include="dependencies\xtils\xtils.hpp" />
+    <ClInclude Include="include\theo\engine.hpp" />
+    <ClInclude Include="include\theo\obf_pass.hpp" />
+    <ClInclude Include="include\theo\symbol.hpp" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <VCProjectVersion>16.0</VCProjectVersion>
@@ -122,17 +126,17 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <LinkIncremental>true</LinkIncremental>
-    <IncludePath>$(ProjectDir)dependencies\xtils;$(ProjectDir)dependencies\linux-pe\includes;$(ProjectDir)dependencies\xed\include\public\xed;$(ProjectDir)dependencies\cli-parser\;$(IncludePath)</IncludePath>
+    <IncludePath>$(ProjectDir)dependencies\xtils;$(ProjectDir)dependencies\linux-pe\includes;$(ProjectDir)dependencies\xed\include\public\xed;$(ProjectDir)dependencies\cli-parser\;$(ProjectDir)include\;$(IncludePath);$(ProjectDir)include\</IncludePath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <LinkIncremental>false</LinkIncremental>
-    <IncludePath>$(ProjectDir)dependencies\xtils;$(ProjectDir)dependencies\linux-pe\includes;$(ProjectDir)dependencies\xed\include\public\xed;$(ProjectDir)dependencies\cli-parser\;$(IncludePath)</IncludePath>
+    <IncludePath>$(ProjectDir)dependencies\xtils;$(ProjectDir)dependencies\linux-pe\includes;$(ProjectDir)dependencies\xed\include\public\xed;$(ProjectDir)dependencies\cli-parser\;$(IncludePath);$(ProjectDir)include\</IncludePath>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpplatest</LanguageStandard>
     </ClCompile>
@@ -153,7 +157,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpplatest</LanguageStandard>
       <EnableModules>true</EnableModules>
diff --git a/theodosius.vcxproj.filters b/theodosius.vcxproj.filters
index aaa6a67..846fbd5 100644
--- a/theodosius.vcxproj.filters
+++ b/theodosius.vcxproj.filters
@@ -31,11 +31,20 @@
     <Filter Include="Header Files\xed">
       <UniqueIdentifier>{57f58b85-e562-44a1-a017-dd0237aa0d80}</UniqueIdentifier>
     </Filter>
+    <Filter Include="Header Files\theo">
+      <UniqueIdentifier>{cb3ff52c-9bb7-4355-b0f1-508a0e8761e2}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Source Files\theo">
+      <UniqueIdentifier>{348d8bd4-31b6-445d-a487-bc39267daf6b}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\main.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\theo\engine.cpp">
+      <Filter>Source Files\theo</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include=".clang-format">
@@ -250,5 +259,14 @@
     <ClInclude Include="dependencies\xed\include\public\xed\xed-version.h">
       <Filter>Header Files\xed</Filter>
     </ClInclude>
+    <ClInclude Include="include\theo\engine.hpp">
+      <Filter>Header Files\theo</Filter>
+    </ClInclude>
+    <ClInclude Include="include\theo\obf_pass.hpp">
+      <Filter>Header Files\theo</Filter>
+    </ClInclude>
+    <ClInclude Include="include\theo\symbol.hpp">
+      <Filter>Header Files\theo</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file