/// <summary>
/// Determines whether the specified pointer is valid to read from.
/// </summary>
/// <param name="ptr">The pointer to check.</param>
/// <returns>
/// <c>true</c> if the pointer is valid; otherwise, <c>false</c>.
/// </returns>
private static bool IsValidReadPtr(IntPtr ptr)
{
NativeStructs.MEMORY_BASIC_INFORMATION mbi = new NativeStructs.MEMORY_BASIC_INFORMATION();
int mbiSize = Marshal.SizeOf(typeof(NativeStructs.MEMORY_BASIC_INFORMATION));
if (SafeNativeMethods.VirtualQuery(ptr, out mbi, new UIntPtr((ulong)mbiSize)) == UIntPtr.Zero)
{
return(false);
}
if (mbi.State != NativeConstants.MEM_COMMIT ||
(mbi.Protect & NativeConstants.PAGE_GUARD) != 0 ||
(mbi.Protect & NativeConstants.PAGE_NOACCESS) != 0)
{
return(false);
}
const int ReadProtect = NativeConstants.PAGE_READONLY |
NativeConstants.PAGE_READWRITE |
NativeConstants.PAGE_WRITECOPY |
NativeConstants.PAGE_EXECUTE_READ |
NativeConstants.PAGE_EXECUTE_READWRITE |
NativeConstants.PAGE_EXECUTE_WRITECOPY;
return((mbi.Protect & ReadProtect) != 0);
}
public static extern int VirtualQueryEx(IntPtr hProcess, IntPtr lpAddress, out NativeStructs.MEMORY_BASIC_INFORMATION lpBuffer, int dwLength);
