Implements the core logic for a file system filter driver: attaching to a file system device or volume, detaching, and enumerating file system volumes. The code demonstrates correct use of IoCreateDevice, IoGetDeviceObjectPointer, and direct callback registration (FsFilterNotificationCallback). This module is a self-contained, reusable skeleton for any file system filter driver, providing a clean pattern for volume attachment and detachment that can be adapted to different filtering requirements. It shows deep understanding of the Windows I/O manager and file system driver stack.

A keyboard class filter driver that demonstrates the completion routine pattern and pending I/O management. It uses a custom IRP_MJ_READ completion routine to intercept keystrokes, an IoCompletion routine that decrements a pending I/O count, and a proper unload routine that cancels pending IRPs. This is a reusable template for any lower-level filter driver that needs to monitor or modify data in I/O completion, with clear lock management and IRP cancellation logic.

A self-contained console application that verifies Authenticode signatures on PE files using WinVerifyTrust with the generic VERIFY_ACTION (WINTRUST_ACTION_GENERIC_VERIFY_V2). It demonstrates the correct setup of WINTRUST_DATA, WINTRUST_FILE_INFO, and the local provider GUID. This is a clean, reusable example for any application that needs to validate digital signatures, with proper error handling for catalog and signature-based verification.

Implements Fast I/O dispatch routines for a file system filter driver, providing pass-through handlers for all Fast I/O operations. The module uses the VALID_FAST_IO_DISPATCH_HANDLER macro to safely set up each dispatch entry point. This is a reusable skeleton for any driver that needs to add Fast I/O handling, demonstrating the required boilerplate and the pattern for forwarding operations to the next lower driver in the stack.