misc.c

Go to the documentation of this file.

/*
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         ReactOS Serial enumerator driver
 * FILE:            drivers/dd/serenum/misc.c
 * PURPOSE:         Miscellaneous operations
 *
 * PROGRAMMERS:     Hervé Poussineau (hpoussin@reactos.com)
 */
 
#include "serenum.h"
 
#include <debug.h>
 
/* I really want PCSZ strings as last arguments because
 * PnP ids are ANSI-encoded in PnP device string
 * identification */
NTSTATUS
SerenumInitMultiSzString(
    OUT PUNICODE_STRING Destination,
    ... /* list of PCSZ */)
{
    va_list args;
    PCSZ Source;
    ANSI_STRING AnsiString;
    UNICODE_STRING UnicodeString;
    ULONG DestinationSize = 0;
    NTSTATUS Status = STATUS_SUCCESS;
 
    ASSERT(Destination);
 
    /* Calculate length needed for destination unicode string */
    va_start(args, Destination);
    Source = va_arg(args, PCSZ);
    while (Source != NULL)
    {
        RtlInitAnsiString(&AnsiString, Source);
        DestinationSize += RtlAnsiStringToUnicodeSize(&AnsiString)
            + sizeof(WCHAR) /* final NULL */;
        Source = va_arg(args, PCSZ);
    }
    va_end(args);
    if (DestinationSize == 0)
    {
        RtlInitUnicodeString(Destination, NULL);
        return STATUS_SUCCESS;
    }
 
    /* Initialize destination string */
    DestinationSize += sizeof(WCHAR); // final NULL
    Destination->Buffer = (PWSTR)ExAllocatePoolWithTag(PagedPool, DestinationSize, SERENUM_TAG);
    if (!Destination->Buffer)
        return STATUS_INSUFFICIENT_RESOURCES;
    Destination->Length = 0;
    Destination->MaximumLength = (USHORT)DestinationSize;
 
    /* Copy arguments to destination string */
    /* Use a temporary unicode string, which buffer is shared with
     * destination string, to copy arguments */
    UnicodeString.Length = Destination->Length;
    UnicodeString.MaximumLength = Destination->MaximumLength;
    UnicodeString.Buffer = Destination->Buffer;
    va_start(args, Destination);
    Source = va_arg(args, PCSZ);
    while (Source != NULL)
    {
        RtlInitAnsiString(&AnsiString, Source);
        Status = RtlAnsiStringToUnicodeString(&UnicodeString, &AnsiString, FALSE);
        if (!NT_SUCCESS(Status))
        {
            ExFreePoolWithTag(Destination->Buffer, SERENUM_TAG);
            break;
        }
        Destination->Length += UnicodeString.Length + sizeof(WCHAR);
        UnicodeString.MaximumLength -= UnicodeString.Length + sizeof(WCHAR);
        UnicodeString.Buffer += UnicodeString.Length / sizeof(WCHAR) + 1;
        UnicodeString.Length = 0;
        Source = va_arg(args, PCSZ);
    }
    va_end(args);
    if (NT_SUCCESS(Status))
    {
        /* Finish multi-sz string */
        Destination->Buffer[Destination->Length / sizeof(WCHAR)] = L'\0';
        Destination->Length += sizeof(WCHAR);
    }
    return Status;
}
 
NTSTATUS NTAPI
ForwardIrpToLowerDeviceAndForget(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp)
{
    PFDO_DEVICE_EXTENSION DeviceExtension;
    PDEVICE_OBJECT LowerDevice;
 
    DeviceExtension = (PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
    ASSERT(DeviceExtension->Common.IsFDO);
 
    LowerDevice = DeviceExtension->LowerDevice;
    ASSERT(LowerDevice);
    TRACE_(SERENUM, "Calling lower device 0x%p\n", LowerDevice);
    IoSkipCurrentIrpStackLocation(Irp);
    return IoCallDriver(LowerDevice, Irp);
}
 
NTSTATUS NTAPI
ForwardIrpToAttachedFdoAndForget(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp)
{
    PPDO_DEVICE_EXTENSION DeviceExtension;
    PDEVICE_OBJECT Fdo;
 
    DeviceExtension = (PPDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
    ASSERT(!DeviceExtension->Common.IsFDO);
 
    Fdo = DeviceExtension->AttachedFdo;
    ASSERT(Fdo);
    TRACE_(SERENUM, "Calling attached Fdo 0x%p\n", Fdo);
    IoSkipCurrentIrpStackLocation(Irp);
    return IoCallDriver(Fdo, Irp);
}
 
NTSTATUS NTAPI
ForwardIrpAndForget(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp)
{
    PDEVICE_OBJECT LowerDevice;
 
    ASSERT(((PCOMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->IsFDO);
    LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
    ASSERT(LowerDevice);
 
    IoSkipCurrentIrpStackLocation(Irp);
    return IoCallDriver(LowerDevice, Irp);
}
 
NTSTATUS
DuplicateUnicodeString(
    IN ULONG Flags,
    IN PCUNICODE_STRING SourceString,
    OUT PUNICODE_STRING DestinationString)
{
    if (SourceString == NULL || DestinationString == NULL
     || SourceString->Length > SourceString->MaximumLength
     || (SourceString->Length == 0 && SourceString->MaximumLength > 0 && SourceString->Buffer == NULL)
     || Flags == RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING || Flags >= 4)
    {
        return STATUS_INVALID_PARAMETER;
    }
 
 
    if ((SourceString->Length == 0)
     && (Flags != (RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE |
                   RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING)))
    {
        DestinationString->Length = 0;
        DestinationString->MaximumLength = 0;
        DestinationString->Buffer = NULL;
    }
    else
    {
        USHORT DestMaxLength = SourceString->Length;
 
        if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
            DestMaxLength += sizeof(UNICODE_NULL);
 
        DestinationString->Buffer = ExAllocatePoolWithTag(PagedPool, DestMaxLength, SERENUM_TAG);
        if (DestinationString->Buffer == NULL)
            return STATUS_NO_MEMORY;
 
        RtlCopyMemory(DestinationString->Buffer, SourceString->Buffer, SourceString->Length);
        DestinationString->Length = SourceString->Length;
        DestinationString->MaximumLength = DestMaxLength;
 
        if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
            DestinationString->Buffer[DestinationString->Length / sizeof(WCHAR)] = 0;
    }
 
    return STATUS_SUCCESS;
}