info.c

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/*
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         Serial port driver
 * FILE:            drivers/dd/serial/info.c
 * PURPOSE:         Serial IRP_MJ_QUERY_INFORMATION operations
 *
 * PROGRAMMERS:     Hervé Poussineau (hpoussin@reactos.org)
 */
 
#include "serial.h"
 
#include <debug.h>
 
NTSTATUS NTAPI
SerialQueryInformation(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp)
{
    PIO_STACK_LOCATION Stack;
    PVOID SystemBuffer;
    ULONG BufferLength;
    ULONG_PTR Information = 0;
    NTSTATUS Status;
 
    Stack = IoGetCurrentIrpStackLocation(Irp);
    SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
    BufferLength = Stack->Parameters.QueryFile.Length;
 
    switch (Stack->Parameters.QueryFile.FileInformationClass)
    {
        case FileStandardInformation:
        {
            PFILE_STANDARD_INFORMATION StandardInfo = (PFILE_STANDARD_INFORMATION)SystemBuffer;
 
            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION / FileStandardInformation\n");
            if (BufferLength < sizeof(FILE_STANDARD_INFORMATION))
                Status = STATUS_BUFFER_OVERFLOW;
            else if (!StandardInfo)
                Status = STATUS_INVALID_PARAMETER;
            else
            {
                StandardInfo->AllocationSize.QuadPart = 0;
                StandardInfo->EndOfFile.QuadPart = 0;
                StandardInfo->Directory = FALSE;
                StandardInfo->NumberOfLinks = 0;
                StandardInfo->DeletePending = FALSE; /* FIXME: should be TRUE sometimes */
                Information = sizeof(FILE_STANDARD_INFORMATION);
                Status = STATUS_SUCCESS;
            }
            break;
        }
        case FilePositionInformation:
        {
            PFILE_POSITION_INFORMATION PositionInfo = (PFILE_POSITION_INFORMATION)SystemBuffer;
 
            ASSERT(PositionInfo);
 
            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION / FilePositionInformation\n");
            if (BufferLength < sizeof(FILE_POSITION_INFORMATION))
                Status = STATUS_BUFFER_OVERFLOW;
            else if (!PositionInfo)
                Status = STATUS_INVALID_PARAMETER;
            else
            {
                PositionInfo->CurrentByteOffset.QuadPart = 0;
                Information = sizeof(FILE_POSITION_INFORMATION);
                Status = STATUS_SUCCESS;
            }
            break;
        }
        default:
        {
            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION: Unexpected file information class 0x%02x\n", Stack->Parameters.QueryFile.FileInformationClass);
            return ForwardIrpAndForget(DeviceObject, Irp);
        }
    }
 
    Irp->IoStatus.Information = Information;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Status;
}