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