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Dalamud.Bootstrap/GameProcess.Win32.Memory.cs

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+using Dalamud.Bootstrap.OS.Windows.Raw;
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+
+namespace Dalamud.Bootstrap
+{
+    public sealed partial class GameProcess : IDisposable
+    {
+        /// <summary>
+        /// Reads the process memory.
+        /// </summary>
+        /// <returns>
+        /// The number of bytes that is actually read.
+        /// </returns>
+        private int ReadMemory(IntPtr address, Span<byte> destination)
+        {
+            unsafe
+            {
+                fixed (byte* pDest = destination)
+                {
+                    if (!Kernel32.ReadProcessMemory(m_handle, address, pDest, (IntPtr)destination.Length, out var bytesRead))
+                    {
+                        ProcessException.ThrowLastOsError();
+                    }
+
+                    // This is okay because destination will never be longer than int.Max
+                    return bytesRead.ToInt32();
+                }
+            }
+        }
+
+        public void ReadMemoryExact(IntPtr address, Span<byte> destination)
+        {
+            var totalBytesRead = 0;
+
+            while (totalBytesRead < destination.Length)
+            {
+                var bytesRead = ReadMemory(address + totalBytesRead, destination[totalBytesRead..]);
+
+                if (bytesRead == 0)
+                {
+                    // prolly page fault; there's not much we can do here
+                    var readBeginAddr = address.ToInt64() + totalBytesRead;
+                    var readEndAddr = address.ToInt64() + destination.Length;
+
+                    ProcessException.ThrowLastOsError();
+                }
+
+                totalBytesRead += bytesRead;
+            }
+        }
+
+        private byte[] ReadMemoryExact(IntPtr address, int length)
+        {
+            var buffer = new byte[length];
+            ReadMemoryExact(address, buffer);
+
+            return buffer;
+        }
+
+        private void ReadMemoryExact<T>(IntPtr address, ref T value) where T : unmanaged
+        {
+            var span = MemoryMarshal.CreateSpan(ref value, 1); // span should never leave this function since it has unbounded lifetime.
+            var buffer = MemoryMarshal.AsBytes(span);
+
+            ReadMemoryExact(address, buffer);
+        }
+
+        private IntPtr GetPebAddress()
+        {
+            unsafe
+            {
+                PROCESS_BASIC_INFORMATION info = default;
+
+                var status = Ntdll.NtQueryInformationProcess(m_handle, PROCESSINFOCLASS.ProcessBasicInformation, &info, sizeof(PROCESS_BASIC_INFORMATION), (IntPtr*)IntPtr.Zero);
+
+                if (!status.Success)
+                {
+                    throw new ProcessException($"Could not query information on process. (Status: {status})");
+                }
+
+                return info.PebBaseAddress;
+            }
+        }
+    }
+}