[arty] 14624: Use DriverDesc in the registry as the adapter name since the ndis name OID

Use DriverDesc in the registry as the adapter name since the ndis name
OID
seems generally unimplemented.  What a pain.
Modified: trunk/reactos/drivers/net/tcpip/datalink/lan.c
Modified: trunk/reactos/drivers/net/tcpip/include/info.h
Modified: trunk/reactos/drivers/net/tcpip/include/tcpip.h
  _____

Modified: trunk/reactos/drivers/net/tcpip/datalink/lan.c
--- trunk/reactos/drivers/net/tcpip/datalink/lan.c	2005-04-14
22:41:48 UTC (rev 14623)
+++ trunk/reactos/drivers/net/tcpip/datalink/lan.c	2005-04-15
00:48:25 UTC (rev 14624)
@@ -18,6 +18,9 @@

UINT LanReceiveWorkerCalled = 0;
 BOOLEAN LanReceiveWorkerBusy = FALSE;

+#define CCS_ROOT L"\Registry\Machine\SYSTEM\CurrentControlSet"
+#define TCPIP_GUID L"{4D36E972-E325-11CE-BFC1-08002BE10318}"
+
 #define NGFP(_Packet)                                             \
     {                                                             \
         PVOID _Header;                                            \
@@ -331,21 +334,21 @@
    IPPacket.Position = 0;

TI_DbgPrint
-		(DEBUG_DATALINK,
-		 ("Ether Type = %x ContigSize = %d Total = %d\n",
-		  PacketType, IPPacket.ContigSize, IPPacket.TotalSize));
+            (DEBUG_DATALINK,
+             ("Ether Type = %x ContigSize = %d Total = %d\n",
+              PacketType, IPPacket.ContigSize, IPPacket.TotalSize));
    
         switch (PacketType) {
-            case ETYPE_IPv4:
-            case ETYPE_IPv6:
-		TI_DbgPrint(MID_TRACE,("Received IP Packet\n"));
-                IPReceive(Adapter->Context, &IPPacket);
-                break;
-            case ETYPE_ARP:
-		TI_DbgPrint(MID_TRACE,("Received ARP Packet\n"));
-                ARPReceive(Adapter->Context, &IPPacket);
-            default:
-                break;
+        case ETYPE_IPv4:
+        case ETYPE_IPv6:
+            TI_DbgPrint(MID_TRACE,("Received IP Packet\n"));
+            IPReceive(Adapter->Context, &IPPacket);
+            break;
+        case ETYPE_ARP:
+            TI_DbgPrint(MID_TRACE,("Received ARP Packet\n"));
+            ARPReceive(Adapter->Context, &IPPacket);
+        default:
+            break;
         }

FreeNdisPacket( Packet );
@@ -599,10 +602,10 @@
  *     SystemSpecific2: Unused & must not be touched
  */
 {
-	/* XXX confirm that this is still true, or re-word the following
comment */
-	/* we get to ignore BindContext because we will never pend an
operation with NDIS */
-	TI_DbgPrint(DEBUG_DATALINK, ("Called with registry path %wZ for
%wZ\n", SystemSpecific1, DeviceName));
-	*Status = LANRegisterAdapter(DeviceName, SystemSpecific1);
+    /* XXX confirm that this is still true, or re-word the following
comment */
+    /* we get to ignore BindContext because we will never pend an
operation with NDIS */
+    TI_DbgPrint(DEBUG_DATALINK, ("Called with registry path %wZ for
%wZ\n", SystemSpecific1, DeviceName));
+    *Status = LANRegisterAdapter(DeviceName, SystemSpecific1);
 }

@@ -664,25 +667,25 @@
             RtlCopyMemory(EHeader->SrcAddr, Adapter->HWAddress,
IEEE_802_ADDR_LENGTH);

switch (Type) {
-                case LAN_PROTO_IPv4:
-                    EHeader->EType = ETYPE_IPv4;
-                    break;
-                case LAN_PROTO_ARP:
-                    EHeader->EType = ETYPE_ARP;
-                    break;
-                case LAN_PROTO_IPv6:
-                    EHeader->EType = ETYPE_IPv6;
-                    break;
-                default:
+            case LAN_PROTO_IPv4:
+                EHeader->EType = ETYPE_IPv4;
+                break;
+            case LAN_PROTO_ARP:
+                EHeader->EType = ETYPE_ARP;
+                break;
+            case LAN_PROTO_IPv6:
+                EHeader->EType = ETYPE_IPv6;
+                break;
+            default:
 #ifdef DBG
-                    /* Should not happen */
-                    TI_DbgPrint(MIN_TRACE, ("Unknown LAN
protocol.\n"));
+                /* Should not happen */
+                TI_DbgPrint(MIN_TRACE, ("Unknown LAN protocol.\n"));

-                    ProtocolSendComplete((NDIS_HANDLE)Context,
-                                         NdisPacket,
-                                         NDIS_STATUS_FAILURE);
+                ProtocolSendComplete((NDIS_HANDLE)Context,
+                                     NdisPacket,
+                                     NDIS_STATUS_FAILURE);
 #endif
-                    return;
+                return;
             }
             break;

@@ -729,7 +732,7 @@
     NTSTATUS Status;

InitializeObjectAttributes(&Attributes, RegistryPath,
OBJ_CASE_INSENSITIVE, 0, 0);
-    Status = ZwOpenKey(RegHandle, GENERIC_READ, &Attributes);
+    Status = ZwOpenKey(RegHandle, KEY_ALL_ACCESS, &Attributes);
     return Status;
 }

@@ -811,7 +814,7 @@
     TI_DbgPrint(MIN_TRACE, ("Information DataLength: 0x%x\n",
Information->DataLength));

UnicodeString.Buffer = (PWCHAR)&Information->Data;
-    UnicodeString.Length = Information->DataLength;
+    UnicodeString.Length = Information->DataLength - sizeof(WCHAR);
     UnicodeString.MaximumLength = Information->DataLength;

String->Buffer = 
@@ -826,34 +829,163 @@
     return STATUS_SUCCESS;
 }

-static VOID GetSimpleAdapterNameFromRegistryPath
-( PUNICODE_STRING TargetString,
-  PUNICODE_STRING RegistryPath ) {
-    PWCHAR i, LastSlash = NULL;
-    UINT NewStringLength = 0;
+/* 
+ * Utility to copy and append two unicode strings.
+ *
+ * IN OUT PUNICODE_STRING ResultFirst -> First string and result
+ * IN     PUNICODE_STRING Second      -> Second string to append
+ * IN     BOOL            Deallocate  -> TRUE: Deallocate First string
before
+ *                                       overwriting.
+ *
+ * Returns NTSTATUS.
+ */

-    for( i = RegistryPath->Buffer; 
-	 i < RegistryPath->Buffer + 
-	     (RegistryPath->Length / sizeof(WCHAR));
-	 i++ ) if( *i == '\' ) LastSlash = i;
+NTSTATUS NTAPI AppendUnicodeString(PUNICODE_STRING ResultFirst,
+				   PUNICODE_STRING Second,
+				   BOOL Deallocate) {
+    NTSTATUS Status;
+    UNICODE_STRING Ustr = *ResultFirst;
+    PWSTR new_string = ExAllocatePoolWithTag
+        (PagedPool,
+         (ResultFirst->Length + Second->Length + sizeof(WCHAR)),
TAG_STRING);
+    if( !new_string ) {
+	return STATUS_NO_MEMORY;
+    }
+    memcpy( new_string, ResultFirst->Buffer, ResultFirst->Length );
+    memcpy( new_string + ResultFirst->Length / sizeof(WCHAR),
+	    Second->Buffer, Second->Length );
+    if( Deallocate ) RtlFreeUnicodeString(ResultFirst);
+    ResultFirst->Length = Ustr.Length + Second->Length;
+    ResultFirst->MaximumLength = ResultFirst->Length;
+    new_string[ResultFirst->Length / sizeof(WCHAR)] = 0;
+    Status = RtlCreateUnicodeString(ResultFirst,new_string) ? 
+	STATUS_SUCCESS : STATUS_NO_MEMORY;
+    ExFreePool(new_string);
+    return Status;
+}

-    if( LastSlash ) LastSlash++; else LastSlash = RegistryPath->Buffer;
+static NTSTATUS CheckForDeviceDesc( PUNICODE_STRING EnumKeyName,
+                                    PUNICODE_STRING TargetKeyName,
+                                    PUNICODE_STRING ShortName,
+                                    PUNICODE_STRING OutName ) {
+    UNICODE_STRING RootDevice = { 0 }, LinkageKeyName = { 0 };
+    UNICODE_STRING DescKeyName = { 0 }, Linkage = { 0 };
+    UNICODE_STRING BackSlash = { 0 };
+    HANDLE DescKey = NULL, LinkageKey = NULL;
+    NTSTATUS Status;

-    NewStringLength = RegistryPath->MaximumLength - 
-	((LastSlash - RegistryPath->Buffer) * sizeof(WCHAR));
+    TI_DbgPrint(DEBUG_DATALINK,("EnumKeyName %wZ\n", EnumKeyName));

-    TargetString->Buffer = 
-	(PWCHAR)exAllocatePool( NonPagedPool, NewStringLength );
+    RtlInitUnicodeString(&BackSlash, L"\");
+    RtlInitUnicodeString(&Linkage, L"\Linkage");

-    if( !TargetString->Buffer ) {
-	TargetString->Length = TargetString->MaximumLength = 0;
-	return;
+    RtlInitUnicodeString(&DescKeyName, L"");
+    AppendUnicodeString( &DescKeyName, EnumKeyName, FALSE );
+    AppendUnicodeString( &DescKeyName, &BackSlash, TRUE );
+    AppendUnicodeString( &DescKeyName, TargetKeyName, TRUE );
+
+    RtlInitUnicodeString(&LinkageKeyName, L"");
+    AppendUnicodeString( &LinkageKeyName, &DescKeyName, FALSE );
+    AppendUnicodeString( &LinkageKeyName, &Linkage, TRUE );
+
+    Status = OpenRegistryKey( &LinkageKeyName, &LinkageKey );
+    if( !NT_SUCCESS(Status) ) goto cleanup;
+
+    Status = ReadStringFromRegistry( LinkageKey, L"RootDevice",
&RootDevice );
+    if( !NT_SUCCESS(Status) ) goto cleanup;
+
+    if( RtlCompareUnicodeString( &RootDevice, ShortName, TRUE ) == 0 )
{
+        Status = OpenRegistryKey( &DescKeyName, &DescKey );
+        if( !NT_SUCCESS(Status) ) goto cleanup;
+
+        Status = ReadStringFromRegistry( DescKey, L"DriverDesc",
OutName );
+        if( !NT_SUCCESS(Status) ) goto cleanup;
+
+        TI_DbgPrint(DEBUG_DATALINK,("ADAPTER NAME: %wZ\n", OutName));
+    } else Status = STATUS_UNSUCCESSFUL;
+
+cleanup:
+    RtlFreeUnicodeString( &RootDevice );
+    RtlFreeUnicodeString( &LinkageKeyName );
+    RtlFreeUnicodeString( &DescKeyName );
+    if( LinkageKey ) NtClose( LinkageKey );
+    if( DescKey ) NtClose( DescKey );
+
+    TI_DbgPrint(DEBUG_DATALINK,("Returning %x\n", Status));
+
+    return Status;
+}
+
+static NTSTATUS FindDeviceNameForAdapter( PUNICODE_STRING ShortName,
+                                          PUNICODE_STRING OutName ) {
+    UNICODE_STRING EnumKeyName, TargetKeyName;
+    HANDLE EnumKey;
+    NTSTATUS Status;
+    ULONG i;
+    KEY_BASIC_INFORMATION *Kbio = 
+        ExAllocatePool(NonPagedPool, sizeof(KEY_BASIC_INFORMATION));
+    ULONG KbioLength = sizeof(KEY_BASIC_INFORMATION), ResultLength;
+
+    RtlInitUnicodeString
+        (&EnumKeyName, CCS_ROOT L"\Control\Class\" TCPIP_GUID);
+
+    Status = OpenRegistryKey( &EnumKeyName, &EnumKey );
+
+    if( !NT_SUCCESS(Status) )
+        TI_DbgPrint(DEBUG_DATALINK,("Couldn't open Enum key %wZ: %x\n",
+                                    &EnumKeyName, Status));
+    
+    for( i = 0; NT_SUCCESS(Status); i++ ) {
+        Status = ZwEnumerateKey( EnumKey, i, KeyBasicInformation, 
+                                 Kbio, KbioLength, &ResultLength );
+
+        if( Status == STATUS_BUFFER_TOO_SMALL ) {
+            ExFreePool( Kbio );
+            KbioLength = ResultLength;
+            Kbio = ExAllocatePool( NonPagedPool, KbioLength );
+
+            Status = ZwEnumerateKey( EnumKey, i, KeyBasicInformation,
+                                     Kbio, KbioLength, &ResultLength );
+
+            TI_DbgPrint(DEBUG_DATALINK,("Couldn't enum key child %d\n",
i));
+            return Status;
+        }
+
+        if( NT_SUCCESS(Status) ) {
+            TargetKeyName.Length = TargetKeyName.MaximumLength = 
+                Kbio->NameLength;
+            TargetKeyName.Buffer = Kbio->Name;
+
+            Status = CheckForDeviceDesc
+                ( &EnumKeyName, &TargetKeyName, ShortName, OutName );
+            if( NT_SUCCESS(Status) ) {
+                NtClose( EnumKey );
+                return Status;
+            } else Status = STATUS_SUCCESS;
+        }
     }

-    TargetString->Length = TargetString->MaximumLength =
NewStringLength;
-    RtlCopyMemory( TargetString->Buffer, LastSlash, NewStringLength );
+    RtlInitUnicodeString( OutName, L"" );
+    AppendUnicodeString( OutName, &TargetKeyName, FALSE );
+    NtClose( EnumKey );
+    return STATUS_UNSUCCESSFUL;
 }

+VOID GetShortName( PUNICODE_STRING RegistryKey,
+                   PUNICODE_STRING ShortNameOut ) {
+    PWCHAR Ptr;
+    ShortNameOut->Buffer = 
+        RegistryKey->Buffer + wcslen(CCS_ROOT L"\Services\");
+    Ptr = ShortNameOut->Buffer;
+
+    while( *Ptr != L'\' && 
+           ((PCHAR)Ptr) < ((PCHAR)RegistryKey->Buffer) +
RegistryKey->Length ) 
+        Ptr++;
+
+    ShortNameOut->Length = ShortNameOut->MaximumLength = 
+        (Ptr - ShortNameOut->Buffer) * sizeof(WCHAR);
+}
+
 VOID BindAdapter(
     PLAN_ADAPTER Adapter,
     PNDIS_STRING RegistryPath)
@@ -873,18 +1005,21 @@
     ULONG Lookahead = LOOKAHEAD_SIZE;
     NTSTATUS Status;
     HANDLE RegHandle = 0;
+    UNICODE_STRING ShortName;

TI_DbgPrint(DEBUG_DATALINK, ("Called.\n"));

Adapter->State = LAN_STATE_OPENING;

+    GetShortName( RegistryPath, &ShortName );
+
     NdisStatus = NDISCall(Adapter,
                           NdisRequestSetInformation,
                           OID_GEN_CURRENT_LOOKAHEAD,
                           &Lookahead,
                           sizeof(ULONG));
     if (NdisStatus != NDIS_STATUS_SUCCESS) {
-        TI_DbgPrint(MID_TRACE, ("Could not set lookahead buffer size
(0x%X).\n", NdisStatus));
+        TI_DbgPrint(DEBUG_DATALINK, ("Could not set lookahead buffer
size (0x%X).\n", NdisStatus));
         return;
     }

@@ -915,6 +1050,11 @@

Status = OpenRegistryKey( RegistryPath, &RegHandle );
        
+    if(NT_SUCCESS(Status)) {
+	Status = FindDeviceNameForAdapter( &ShortName, &IF->Name );
+        TI_DbgPrint(DEBUG_DATALINK,("Adapter Name: %wZ\n", &IF->Name));
+    }
+
     if(NT_SUCCESS(Status))
    Status = ReadIPAddressFromRegistry( RegHandle,
L"DefaultGateway",
    				    &DefaultGateway );
@@ -935,58 +1075,35 @@
         IF->Unicast.Address.IPv4Address | 
         ~IF->Netmask.Address.IPv4Address;

-    TI_DbgPrint(MID_TRACE,("BCAST(IF) %s\n", A2S(&IF->Broadcast)));
+    TI_DbgPrint(DEBUG_DATALINK,("BCAST(IF) %s\n",
A2S(&IF->Broadcast)));

if(NT_SUCCESS(Status)) {
-        RtlZeroMemory( &IF->Name, sizeof(IF->Name) );
-	Status = ReadStringFromRegistry( RegHandle, L"DeviceDesc",
-					 &IF->Name );
-
-	/* I think that not getting a devicedesc is not a fatal error */
-	if( !NT_SUCCESS(Status) ) {
-	    if( IF->Name.Buffer ) exFreePool( IF->Name.Buffer );
-	    GetSimpleAdapterNameFromRegistryPath( &IF->Name,
RegistryPath );
-	}
-	Status = STATUS_SUCCESS;
+        /* It's ok to fail some of the above.  We'll just use DHCP. */
+        TI_DbgPrint
+            (DEBUG_DATALINK, 
+             ("--> Our IP address on this interface: '%s'\n", 
+              A2S(&IF->Unicast)));
+        
+        TI_DbgPrint
+            (DEBUG_DATALINK, 
+             ("--> Our net mask on this interface: '%s'\n", 
+              A2S(&IF->Netmask)));
+        
+        if( DefaultGateway.Address.IPv4Address ) {
+            TI_DbgPrint
+                (DEBUG_DATALINK, 
+                 ("--> Our gateway is: '%s'\n", 
+                  A2S(&DefaultGateway)));
+            
+            /* Create a default route */
+            RouterCreateRoute( &DefaultMask, /* Zero */
+                               &DefaultMask, /* Zero */
+                               &DefaultGateway,
+                               IF,
+                               1 );
+        }
     }

-    TI_DbgPrint(MID_TRACE,("Adapter Name: %wZ\n", &IF->Name));
-
-    if(!NT_SUCCESS(Status))
-    {
-	TI_DbgPrint(MIN_TRACE, ("Unable to open protocol-specific
registry key: 0x%x\n", Status));
-	
-	/* XXX how do we proceed?  No ip address, no parameters... do we
guess? */
-	if(RegHandle)  
-	    ZwClose(RegHandle);
-	IPDestroyInterface(IF);
-	return;
-    }
-    
-    TI_DbgPrint
-	(MID_TRACE, 
-	 ("--> Our IP address on this interface: '%s'\n", 
-	  A2S(&IF->Unicast)));
-    
-    TI_DbgPrint
-	(MID_TRACE, 
-	 ("--> Our net mask on this interface: '%s'\n", 
-	  A2S(&IF->Netmask)));
-
-    if( DefaultGateway.Address.IPv4Address ) {
-	TI_DbgPrint
-	    (MID_TRACE, 
-	     ("--> Our gateway is: '%s'\n", 
-	      A2S(&DefaultGateway)));
-
-	/* Create a default route */
-	RouterCreateRoute( &DefaultMask, /* Zero */
-			   &DefaultMask, /* Zero */
-			   &DefaultGateway,
-			   IF,
-			   1 );
-    }
-
     /* Get maximum link speed */
     NdisStatus = NDISCall(Adapter,
                           NdisRequestQueryInformation,
@@ -1008,7 +1125,7 @@
                           sizeof(UINT));

if (NdisStatus != NDIS_STATUS_SUCCESS) {
-        TI_DbgPrint(MID_TRACE, ("Could not set packet filter
(0x%X).\n", NdisStatus));
+        TI_DbgPrint(DEBUG_DATALINK, ("Could not set packet filter
(0x%X).\n", NdisStatus));
         IPDestroyInterface(IF);
         return;
     }
@@ -1232,10 +1349,10 @@
         NdisCloseAdapter(&NdisStatus, NdisHandle);
         if (NdisStatus == NDIS_STATUS_PENDING) {
             TcpipWaitForSingleObject(&Adapter->Event,
-                                  UserRequest,
-                                  KernelMode,
-                                  FALSE,
-                                  NULL);
+                                     UserRequest,
+                                     KernelMode,
+                                     FALSE,
+                                     NULL);
             NdisStatus = Adapter->NdisStatus;
         }
     } else
@@ -1284,16 +1401,16 @@
     ProtChars.StatusCompleteHandler          = ProtocolStatusComplete;
     ProtChars.BindAdapterHandler             = ProtocolBindAdapter;

-	/* Try to register protocol */
+    /* Try to register protocol */
     NdisRegisterProtocol(&NdisStatus,
                          &NdisProtocolHandle,
                          &ProtChars,
                          sizeof(NDIS_PROTOCOL_CHARACTERISTICS));
     if (NdisStatus != NDIS_STATUS_SUCCESS)
-	 {
-		 TI_DbgPrint(MID_TRACE, ("NdisRegisterProtocol failed,
status 0x%x\n", NdisStatus));
+    {
+        TI_DbgPrint(DEBUG_DATALINK, ("NdisRegisterProtocol failed,
status 0x%x\n", NdisStatus));
         return (NTSTATUS)NdisStatus;
-	 }
+    }

ProtocolRegistered = TRUE;

@@ -1323,7 +1440,7 @@
         CurrentEntry = AdapterListHead.Flink;
         while (CurrentEntry != &AdapterListHead) {
             NextEntry = CurrentEntry->Flink;
-	        Current = CONTAINING_RECORD(CurrentEntry, LAN_ADAPTER,
ListEntry);
+            Current = CONTAINING_RECORD(CurrentEntry, LAN_ADAPTER,
ListEntry);
             /* Unregister it */
             LANUnregisterAdapter(Current);
             CurrentEntry = NextEntry;
  _____

Modified: trunk/reactos/drivers/net/tcpip/include/info.h
--- trunk/reactos/drivers/net/tcpip/include/info.h	2005-04-14
22:41:48 UTC (rev 14623)
+++ trunk/reactos/drivers/net/tcpip/include/info.h	2005-04-15
00:48:25 UTC (rev 14624)
@@ -74,11 +74,13 @@

ULONG LastChange;
     ULONG InOctets;
     ULONG InUcastPackets;
+    ULONG InNUcastPackets;
     ULONG InDiscards;
     ULONG InErrors;
     ULONG InUnknownProtos;
     ULONG OutOctets;
     ULONG OutUcastPackets;
+    ULONG OutNUcastPackets;
     ULONG OutDiscards;
     ULONG OutErrors;
     ULONG OutQLen;
  _____

Modified: trunk/reactos/drivers/net/tcpip/include/tcpip.h
--- trunk/reactos/drivers/net/tcpip/include/tcpip.h	2005-04-14
22:41:48 UTC (rev 14623)
+++ trunk/reactos/drivers/net/tcpip/include/tcpip.h	2005-04-15
00:48:25 UTC (rev 14624)
@@ -30,6 +30,7 @@

#include <debug.h>

+#define TAG_STRING	TAG('S', 'T', 'R', ' ') /* string */

/* Define _NTTEST_ to make test version. Device names are prefixed with
    'NT' to allow the driver to run side by side with MS TCP/IP driver
*/

[Alex Ionescu]

[e-mail] wrote:
> +NTSTATUS NTAPI AppendUnicodeString(PUNICODE_STRING ResultFirst,
> 		   PUNICODE_STRING Second,
> 		   BOOL Deallocate) {
> NTSTATUS Status;
> UNICODE_STRING Ustr = *ResultFirst;
> PWSTR new_string = ExAllocatePoolWithTag
>    (PagedPool,
>     (ResultFirst->Length + Second->Length + sizeof(WCHAR)), TAG_STRING);
> if( !new_string ) {
> return STATUS_NO_MEMORY;
> }
> memcpy( new_string, ResultFirst->Buffer, ResultFirst->Length );
> memcpy( new_string + ResultFirst->Length / sizeof(WCHAR),
>    Second->Buffer, Second->Length );
> if( Deallocate ) RtlFreeUnicodeString(ResultFirst);
> ResultFirst->Length = Ustr.Length + Second->Length;
> ResultFirst->MaximumLength = ResultFirst->Length;
> new_string[ResultFirst->Length / sizeof(WCHAR)] = 0;
> Status = RtlCreateUnicodeString(ResultFirst,new_string) ?
> STATUS_SUCCESS : STATUS_NO_MEMORY;
> ExFreePool(new_string);
> return Status;
>
> +}

What's wrong with

RtlAppendUnicodeStringToString ?

Best regards,
Alex Ionescu

[art yerkes]

On Fri, 15 Apr 2005 02:31:18 -0400
Alex Ionescu [e-mail] wrote:
> [e-mail] wrote:
> > +NTSTATUS NTAPI AppendUnicodeString(PUNICODE_STRING ResultFirst,
> > 		   PUNICODE_STRING Second,
> > 		   BOOL Deallocate) {
> > NTSTATUS Status;
> > UNICODE_STRING Ustr = *ResultFirst;
> > PWSTR new_string = ExAllocatePoolWithTag
> >    (PagedPool,
> >     (ResultFirst->Length + Second->Length + sizeof(WCHAR)), TAG_STRING);
> > if( !new_string ) {
> > return STATUS_NO_MEMORY;
> > }
> > memcpy( new_string, ResultFirst->Buffer, ResultFirst->Length );
> > memcpy( new_string + ResultFirst->Length / sizeof(WCHAR),
> >    Second->Buffer, Second->Length );
> > if( Deallocate ) RtlFreeUnicodeString(ResultFirst);
> > ResultFirst->Length = Ustr.Length + Second->Length;
> > ResultFirst->MaximumLength = ResultFirst->Length;
> > new_string[ResultFirst->Length / sizeof(WCHAR)] = 0;
> > Status = RtlCreateUnicodeString(ResultFirst,new_string) ?
> > STATUS_SUCCESS : STATUS_NO_MEMORY;
> > ExFreePool(new_string);
> > return Status;
> >
> > +}
>
> What's wrong with
>
> RtlAppendUnicodeStringToString ?

You still have to reallocate the string yourself.  This is more compact
and improves abstraction.
-- 
Here's a simple experiment. Stand on a train track between two locomotives
which are pushing on you with equal force in opposite directions. You will
exhibit no net motion. None the less, you may soon begin to notice that
something important is happening.
-- Robert Stirniman