CommModifyKit/driver/SerialFilter.h

// SerialFilter.h - 串口 IRP 拦截
// 职责：作为上层过滤驱动 attach 到串口设备栈
//      拦截 IRP_MJ_READ / IRP_MJ_WRITE / IRP_MJ_DEVICE_CONTROL
//      将捕获的数据推入对应端口的环形缓冲
#pragma once

#include <ntddk.h>
#include <wdf.h>
#include "DeviceContext.h"

namespace commkit_driver {

class SerialFilter {
public:
    // 创建过滤设备并 attach 到串口设备栈
    // parent_serial_pdo：下层串口的 PDO
    // 返回 STATUS_SUCCESS + 设置 *filter_device
    static NTSTATUS CreateAndAttach(WDFDRIVER driver,
                                      PDEVICE_OBJECT serial_pdo,
                                      ULONG com_number,
                                      WDFDEVICE* out_filter_device);

    // 拦截 IRP_MJ_READ 完成：捕获数据并推入环形缓冲
    static NTSTATUS OnReadComplete(PDEVICE_OBJECT dev, PIRP irp, PVOID ctx);

    // 拦截 IRP_MJ_WRITE 完成：捕获数据并推入环形缓冲
    static NTSTATUS OnWriteComplete(PDEVICE_OBJECT dev, PIRP irp, PVOID ctx);

    // WDM IRP 预处理回调（KMDF 签名：WDFDEVICE, PIRP）
    static NTSTATUS DispatchRead(WDFDEVICE dev, PIRP irp);
    static NTSTATUS DispatchWrite(WDFDEVICE dev, PIRP irp);
    static NTSTATUS DispatchDeviceControl(WDFDEVICE dev, PIRP irp);

private:
    // 从 IRP 中提取数据并推入环形缓冲
    // event_type：COMMKIT_OP_READ 或 COMMKIT_OP_WRITE
    static void CaptureIrpData(PDEVICE_CONTEXT ctx, PIRP irp, ULONG event_type);
};

} // namespace commkit_driver