reactos/drivers/serial/serenum/misc.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS Serial enumerator driver
* FILE: drivers/dd/serenum/misc.c
* PURPOSE: Miscellaneous operations
*
* PROGRAMMERS: Herv<EFBFBD> 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;
}