R/ChocolArm64/Memory/AMemoryWin32.cs

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using System;
using System.Runtime.InteropServices;
namespace ChocolArm64.Memory
{
static class AMemoryWin32
{
private const int MEM_COMMIT = 0x00001000;
private const int MEM_RESERVE = 0x00002000;
private const int MEM_WRITE_WATCH = 0x00200000;
private const int PAGE_READWRITE = 0x04;
private const int MEM_RELEASE = 0x8000;
private const int WRITE_WATCH_FLAG_RESET = 1;
[DllImport("kernel32.dll")]
private static extern IntPtr VirtualAlloc(IntPtr lpAddress, IntPtr dwSize, int flAllocationType, int flProtect);
[DllImport("kernel32.dll")]
private static extern bool VirtualFree(IntPtr lpAddress, IntPtr dwSize, int dwFreeType);
[DllImport("kernel32.dll")]
private unsafe static extern int GetWriteWatch(
int dwFlags,
IntPtr lpBaseAddress,
IntPtr dwRegionSize,
IntPtr[] lpAddresses,
long* lpdwCount,
long* lpdwGranularity);
public static IntPtr Allocate(IntPtr Size)
{
const int Flags = MEM_COMMIT | MEM_RESERVE | MEM_WRITE_WATCH;
IntPtr Address = VirtualAlloc(IntPtr.Zero, Size, Flags, PAGE_READWRITE);
if (Address == IntPtr.Zero)
{
throw new InvalidOperationException();
}
return Address;
}
public static void Free(IntPtr Address)
{
VirtualFree(Address, IntPtr.Zero, MEM_RELEASE);
}
public unsafe static long IsRegionModified(IntPtr Address, IntPtr Size, bool Reset)
{
IntPtr[] Addresses = new IntPtr[1];
long Count = Addresses.Length;
long Granularity;
int Flags = Reset ? WRITE_WATCH_FLAG_RESET : 0;
GetWriteWatch(
Flags,
Address,
Size,
Addresses,
&Count,
&Granularity);
return Count != 0 ? Granularity : 0;
}
}
}