public TrampolineDetour(IntPtr pointer, uint size, Mapper <T> mapDetour)
{
_pointer = pointer;
_size = size;
var trampolineSize = _size + JmpSize;
_trampoline = Kernel32.VirtualAlloc(IntPtr.Zero, trampolineSize, Commit | Reserve, ExecuteRead);
using (_trampoline.Protect(trampolineSize, ReadWrite))
{
Kernel32.CopyMemory(_trampoline, _pointer, _size);
_trampoline
.Offset((int)_size)
.AppendJmp2(_pointer.Offset((int)_size));
}
var original = _trampoline.ToDelegate <T>();
var detour = mapDetour(original);
_handle = GCHandle.Alloc(detour, GCHandleType.Normal);
var detourPointer = detour.ToIntPtr();
using (_pointer.Protect(_size, ReadWrite))
{
_pointer
.AppendJmp2(detourPointer)
.AppendNop((int)_size - JmpSize);
}
}
