From d663252ed10455465ed6aea6ddf9cb5665730fcf Mon Sep 17 00:00:00 2001
From: Mino <1381835+Minoost@users.noreply.github.com>
Date: Sat, 29 Feb 2020 18:40:53 +0900
Subject: [PATCH] ntdll

---
 Dalamud.Injector/FFI/Win32.cs  | 54 ++++++++++++++++++++++++++++++++++
 Dalamud.Injector/OS/Process.cs | 27 +++++++++++++++--
 2 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/Dalamud.Injector/FFI/Win32.cs b/Dalamud.Injector/FFI/Win32.cs
index 64f2f6658..394065fbc 100644
--- a/Dalamud.Injector/FFI/Win32.cs
+++ b/Dalamud.Injector/FFI/Win32.cs
@@ -1,11 +1,65 @@
+using Microsoft.Win32.SafeHandles;
 using System;
 using System.Collections.Generic;
+using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Dalamud.Injector.FFI
 {
     internal static class Win32
     {
+        [DllImport("kernel32", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
+        public static extern SafeProcessHandle OpenProcess(uint dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, uint dwProcessId);
+
+        [DllImport("kernel32", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
+        public static extern NtStatus NtQueryInformationProcess(/* TODO */);
+
 
     }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal partial struct NtStatus
+    {
+        public uint Value { get; }
+    }
+
+    internal partial struct NtStatus
+    {
+        public NtStatus(uint value)
+        {
+            Value = value;
+        }
+
+        /// <summary>
+        /// Equivalent to NT_SUCCESS
+        /// </summary>
+        public bool Success => Value <= 0x7FFFFFFF;
+
+        /// <summary>
+        /// Equivalent to NT_INFORMATION
+        /// </summary>
+        public bool Information => 0x40000000 <= Value && Value <= 0x7FFFFFFF;
+
+        /// <summary>
+        /// Equivalent to NT_WARNING
+        /// </summary>
+        public bool Warning => 0x80000000 <= Value && Value <= 0xBFFFFFFF;
+
+        /// <summary>
+        /// Equivalent to NT_ERROR
+        /// </summary>
+        public bool Error => 0xC0000000 <= Value;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct PROCESS_BASIC_INFORMATION
+    {
+        // https://github.com/processhacker/processhacker/blob/e43d7c0513ec5368c3309a58c9f2c2a3ca5de367/phnt/include/ntpsapi.h#L272
+        public NtStatus ExitStatus;
+        public IntPtr PebBaseAddress;
+        public IntPtr AffinityMask;
+        public IntPtr BasePriority;
+        public IntPtr UniqueProcessId;
+        public IntPtr InheritedFromUniqueProcessId;
+    }
 }
diff --git a/Dalamud.Injector/OS/Process.cs b/Dalamud.Injector/OS/Process.cs
index ded8833a7..fd316bf91 100644
--- a/Dalamud.Injector/OS/Process.cs
+++ b/Dalamud.Injector/OS/Process.cs
@@ -1,10 +1,33 @@
-using System;
+using Microsoft.Win32.SafeHandles;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace Dalamud.Injector.OS
 {
-    internal sealed class Process
+    internal sealed partial class Process : IDisposable
     {
+        private SafeProcessHandle m_handle;
+    }
+
+    internal sealed partial class Process {
+        internal Process(SafeProcessHandle handle)
+        {
+            m_handle = handle;
+        }
+        
+        public static Process Open(uint pid/* and perms? maybe? */)
+        {
+            //
+            throw new NotImplementedException("TODO");
+        }
+
+        
+
+        public void Dispose()
+        {
+            m_handle?.Dispose();
+            m_handle = null!;
+        }
     }
 }