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windows-nt/Source/XPSP1/NT/net/dlc/driver/dlcreg.c

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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
dlcreg.c
Abstract:
This module accesses the registry for DLC.SYS
Contents:
DlcRegistryInitialization
LoadDlcConfiguration
LoadAdapterConfiguration
GetAdapterParameters
OpenDlcRegistryHandle
OpenDlcAdapterRegistryHandle
GetRegistryParameter
SetRegistryParameter
DlcpGetParameter
DlcRegistryTermination
Author:
Richard L Firth (rfirth) 31-Mar-1993
Environment:
kernel mode only
Revision History:
30-Mar-1993 rfirth
created
04-May-1994 rfirth
Exposed GetAdapterParameters
--*/
#include <ntddk.h>
#include <windef.h>
#include <dlcapi.h>
#include <dlcio.h>
#include <ndis.h>
#include "llcapi.h"
#include "dlcdef.h"
#include "dlcreg.h"
#include "dlctyp.h"
#include "llcdef.h"
#include "llcmem.h"
#include "llctyp.h"
#include "llcext.h"
//
// manifests
//
#define MAX_ADAPTER_NAME_LENGTH 32 // ?
#define MAX_INFORMATION_BUFFER_LENGTH 256 // ?
#define PARAMETERS_STRING L"Parameters"
//
// indicies of parameters within parameter table
//
#define SWAP_INDEX 0
#define USEDIX_INDEX 1
#define T1_TICK_ONE_INDEX 2
#define T2_TICK_ONE_INDEX 3
#define Ti_TICK_ONE_INDEX 4
#define T1_TICK_TWO_INDEX 5
#define T2_TICK_TWO_INDEX 6
#define Ti_TICK_TWO_INDEX 7
#define FRAME_SIZE_INDEX 8
//
// typedefs
//
//
// macros
//
#define CloseDlcRegistryHandle(handle) ZwClose(handle)
#define CloseAdapterRegistryHandle(handle) ZwClose(handle)
//
// Global data
//
//
// private data
//
UNICODE_STRING DlcRegistryPath;
UNICODE_STRING ParametersPath;
//
// AdapterParameterTable - used for loading DLC parameters from registry in
// data-driven manner. Each adapter that DLC talks to can have a set of all
// or part of the following variables
//
DLC_REGISTRY_PARAMETER AdapterParameterTable[] = {
L"Swap",
(PVOID)DEFAULT_SWAP_ADDRESS_BITS,
{
REG_DWORD,
PARAMETER_IS_BOOLEAN,
NULL,
sizeof(ULONG),
NULL,
0,
0
},
L"UseDixOverEthernet",
(PVOID)DEFAULT_DIX_FORMAT,
{
REG_DWORD,
PARAMETER_IS_BOOLEAN,
NULL,
sizeof(ULONG),
NULL,
0,
0
},
L"T1TickOne",
(PVOID)DEFAULT_T1_TICK_ONE,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"T2TickOne",
(PVOID)DEFAULT_T2_TICK_ONE,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"TiTickOne",
(PVOID)DEFAULT_Ti_TICK_ONE,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"T1TickTwo",
(PVOID)DEFAULT_T1_TICK_TWO,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"T2TickTwo",
(PVOID)DEFAULT_T2_TICK_TWO,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"TiTickTwo",
(PVOID)DEFAULT_Ti_TICK_TWO,
{
REG_DWORD,
PARAMETER_IS_UCHAR,
NULL,
sizeof(ULONG),
NULL,
MIN_TIMER_TICK_VALUE,
MAX_TIMER_TICK_VALUE
},
L"UseEthernetFrameSize",
(PVOID)DEFAULT_USE_ETHERNET_FRAME_SIZE,
{
REG_DWORD,
PARAMETER_IS_BOOLEAN,
NULL,
sizeof(ULONG),
NULL,
0,
0
}
};
#ifdef NDIS40
DLC_REGISTRY_PARAMETER AdapterInitTimeout =
{
L"WaitForAdapter",
(PVOID) 15, // Default is 15 seconds.
{
REG_DWORD,
PARAMETER_AS_SPECIFIED,
NULL,
sizeof(ULONG),
NULL,
0, // Min acceptable value
(ULONG) -1 // Allow to set anything.
}
};
#endif // NDIS40
#define NUMBER_OF_DLC_PARAMETERS (sizeof(AdapterParameterTable)/sizeof(AdapterParameterTable[0]))
//
// private function prototypes
//
NTSTATUS
OpenDlcRegistryHandle(
IN PUNICODE_STRING RegistryPath,
OUT PHANDLE DlcRegistryHandle
);
NTSTATUS
OpenDlcAdapterRegistryHandle(
IN HANDLE DlcRegistryHandle,
IN PUNICODE_STRING AdapterName,
OUT PHANDLE DlcAdapterRegistryHandle,
OUT PBOOLEAN Created
);
NTSTATUS
GetRegistryParameter(
IN HANDLE KeyHandle,
IN PDLC_REGISTRY_PARAMETER Parameter,
IN BOOLEAN SetOnFail
);
NTSTATUS
SetRegistryParameter(
IN HANDLE KeyHandle,
IN PDLC_REGISTRY_PARAMETER Parameter
);
NTSTATUS
DlcpGetParameter(
IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext
);
//
// debug display options
//
#if DBG
BOOLEAN DebugConfig = TRUE;
#endif
//
// functions
//
VOID
DlcRegistryInitialization(
IN PUNICODE_STRING RegistryPath
)
/*++
Routine Description:
Initializes memory structures for functions in this module
Arguments:
RegistryPath - pointer to UNICODE_STRING giving base of DLC section in
registry
Return Value:
None.
--*/
{
ASSUME_IRQL(PASSIVE_LEVEL);
LlcInitUnicodeString(&DlcRegistryPath, RegistryPath);
RtlInitUnicodeString(&ParametersPath, PARAMETERS_STRING);
}
VOID
DlcRegistryTermination(
VOID
)
/*++
Routine Description:
Undoes anything done in DlcRegistryInitialization
Arguments:
None.
Return Value:
None.
--*/
{
ASSUME_IRQL(PASSIVE_LEVEL);
LlcFreeUnicodeString(&DlcRegistryPath);
}
VOID
LoadDlcConfiguration(
VOID
)
/*++
Routine Description:
Initializes the data structures used to access the registry and loads any
configuration parameters for the driver
Arguments:
None.
Return Value:
None.
--*/
{
//
// nothing else to do at present since we made all currently known
// configuration parameters per-adapter
//
}
VOID
LoadAdapterConfiguration(
IN PUNICODE_STRING AdapterName,
OUT PADAPTER_CONFIGURATION_INFO ConfigInfo
)
/*++
Routine Description:
Loads all of DLC initialization parameters for an adapter from registry:
Swap 0 or 1, default 1
UseDixOverEthernet 0 or 1, default 0
T1TickOne 1 - 255, default 5
T1TickTwo 1 - 255, default 25
T2TickOne 1 - 255, default 1
T2TickTwo 1 - 255, default 10
TiTickOne 1 - 255, default 25
TiTickTwo 1 - 255, default 125
UseEthernetFrameSize 0 or 1, default 1
If any of the parameters do not exist in the DLC\Parameters\<AdapterName>
section, then they are created
Arguments:
AdapterName - pointer to UNICODE_STRING structure giving the name of the
adapter we are opening. This is the value of a key in the
DLC\Parameters section.
The string is EXPECTED to be of the form \Device\<adapter>
ConfigInfo - pointer to the structure that receives the values on output
Return Value:
None.
--*/
{
UINT i;
PDLC_REGISTRY_PARAMETER parameterTable;
ASSUME_IRQL(PASSIVE_LEVEL);
//
// fill in the adapter configuration structure with default values. These
// will be used to update the registry if the value entry doesn't currently
// exist
//
ConfigInfo->SwapAddressBits = (BOOLEAN)DEFAULT_SWAP_ADDRESS_BITS;
ConfigInfo->UseDix = (BOOLEAN)DEFAULT_DIX_FORMAT;
ConfigInfo->TimerTicks.T1TickOne = (UCHAR)DEFAULT_T1_TICK_ONE;
ConfigInfo->TimerTicks.T2TickOne = (UCHAR)DEFAULT_T2_TICK_ONE;
ConfigInfo->TimerTicks.TiTickOne = (UCHAR)DEFAULT_Ti_TICK_ONE;
ConfigInfo->TimerTicks.T1TickTwo = (UCHAR)DEFAULT_T1_TICK_TWO;
ConfigInfo->TimerTicks.T2TickTwo = (UCHAR)DEFAULT_T2_TICK_TWO;
ConfigInfo->TimerTicks.TiTickTwo = (UCHAR)DEFAULT_Ti_TICK_TWO;
ConfigInfo->UseEthernetFrameSize = (BOOLEAN)DEFAULT_USE_ETHERNET_FRAME_SIZE;
//
// create and initialize a copy of the DLC adapter parameters template
//
parameterTable = (PDLC_REGISTRY_PARAMETER)ALLOCATE_MEMORY_DRIVER(
sizeof(*parameterTable) * NUMBER_OF_DLC_PARAMETERS);
if (parameterTable) {
RtlCopyMemory(parameterTable, AdapterParameterTable, sizeof(AdapterParameterTable));
for (i = 0; i < NUMBER_OF_DLC_PARAMETERS; ++i) {
parameterTable[i].Descriptor.Value = (PVOID)&parameterTable[i].DefaultValue;
switch (i) {
case SWAP_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->SwapAddressBits;
break;
case USEDIX_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->UseDix;
break;
case T1_TICK_ONE_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.T1TickOne;
break;
case T2_TICK_ONE_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.T2TickOne;
break;
case Ti_TICK_ONE_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.TiTickOne;
break;
case T1_TICK_TWO_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.T1TickTwo;
break;
case T2_TICK_TWO_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.T2TickTwo;
break;
case Ti_TICK_TWO_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->TimerTicks.TiTickTwo;
break;
case FRAME_SIZE_INDEX:
parameterTable[i].Descriptor.Variable = &ConfigInfo->UseEthernetFrameSize;
break;
}
}
GetAdapterParameters(AdapterName, parameterTable, NUMBER_OF_DLC_PARAMETERS, FALSE);
FREE_MEMORY_DRIVER(parameterTable);
}
#if DBG
if (DebugConfig) {
DbgPrint("DLC.LoadAdapterConfigurationFromRegistry for adapter %ws:\n"
"\tSwap . . . . . . . . . : %d\n"
"\tUseDixOverEthernet . . : %d\n"
"\tT1TickOne. . . . . . . : %d\n"
"\tT2TickOne. . . . . . . : %d\n"
"\tTiTickOne. . . . . . . : %d\n"
"\tT1TickTwo. . . . . . . : %d\n"
"\tT2TickTwo. . . . . . . : %d\n"
"\tTiTickTwo. . . . . . . : %d\n"
"\tUseEthernetFrameSize . : %d\n",
AdapterName->Buffer,
ConfigInfo->SwapAddressBits,
ConfigInfo->UseDix,
ConfigInfo->TimerTicks.T1TickOne,
ConfigInfo->TimerTicks.T2TickOne,
ConfigInfo->TimerTicks.TiTickOne,
ConfigInfo->TimerTicks.T1TickTwo,
ConfigInfo->TimerTicks.T2TickTwo,
ConfigInfo->TimerTicks.TiTickTwo,
ConfigInfo->UseEthernetFrameSize
);
}
#endif
}
#ifdef NDIS40
NTSTATUS
GetAdapterWaitTimeout(
PULONG pulWait)
/*++
Routine Description:
Some adapters are delayed during initialization and are not completed
even after the PnPBindsComplete event (such as ATM LANE adapter).
This timeout value 'WaitForAdapter' indicates how many seconds to wait for
an adapter if is not already present/bound in LlcOpenAdapter
Arguments:
pulWait -- Pointer to variable to store the wait timeout.
Return Value:
STATUS_SUCCESS
STATUS_INSUFFICIENT_RESOURCES
--*/
{
NTSTATUS NtStatus;
HANDLE hDlc;
HANDLE hDlcParms;
OBJECT_ATTRIBUTES ObjAttribs;
ULONG ulDisp;
NtStatus = OpenDlcRegistryHandle(&DlcRegistryPath, &hDlc);
if (NT_SUCCESS(NtStatus))
{
InitializeObjectAttributes(
&ObjAttribs,
&ParametersPath,
OBJ_CASE_INSENSITIVE,
hDlc,
NULL);
NtStatus = ZwCreateKey(
&hDlcParms,
KEY_READ,
&ObjAttribs,
0,
NULL,
0,
&ulDisp);
if (NT_SUCCESS(NtStatus))
{
PDLC_REGISTRY_PARAMETER pWaitTimeout;
pWaitTimeout = (PDLC_REGISTRY_PARAMETER) ALLOCATE_MEMORY_DRIVER(
sizeof(DLC_REGISTRY_PARAMETER));
if (pWaitTimeout)
{
RtlCopyMemory(
pWaitTimeout,
&AdapterInitTimeout,
sizeof(AdapterInitTimeout));
pWaitTimeout->Descriptor.Variable = pulWait;
pWaitTimeout->Descriptor.Value = (PVOID)&pWaitTimeout->DefaultValue;
NtStatus = GetRegistryParameter(
hDlcParms,
pWaitTimeout,
FALSE); // Don't set on fail.
FREE_MEMORY_DRIVER(pWaitTimeout);
}
else
{
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
ZwClose(hDlcParms);
}
CloseDlcRegistryHandle(hDlc);
}
return (NtStatus);
}
#endif // NDIS40
NTSTATUS
GetAdapterParameters(
IN PUNICODE_STRING AdapterName,
IN PDLC_REGISTRY_PARAMETER Parameters,
IN ULONG NumberOfParameters,
IN BOOLEAN SetOnFail
)
/*++
Routine Description:
Retrieves a list of parameters from the DLC\Parameters\<AdapterName> section
in the registry
Arguments:
AdapterName - pointer to UNICODE_STRING identifying adapter section
in DLC section of registry to open
Parameters - pointer to array of DLC_REGISTRY_PARAMETER structures
describing variables and default values to retrieve
NumberOfParameters - number of structures in Parameters array
SetOnFail - TRUE if we should set the registry parameter if we
fail to get it
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
NTSTATUS status;
HANDLE dlcHandle;
ASSUME_IRQL(PASSIVE_LEVEL);
status = OpenDlcRegistryHandle(&DlcRegistryPath, &dlcHandle);
if (NT_SUCCESS(status)) {
HANDLE adapterHandle;
BOOLEAN created;
status = OpenDlcAdapterRegistryHandle(dlcHandle,
AdapterName,
&adapterHandle,
&created
);
if (NT_SUCCESS(status)) {
while (NumberOfParameters--) {
//
// if this adapter section was created then create the parameter
// value entries and set them to the defaults, else retrieve the
// current registry values
//
if (created) {
SetRegistryParameter(adapterHandle, Parameters);
} else {
GetRegistryParameter(adapterHandle, Parameters, SetOnFail);
}
++Parameters;
}
CloseAdapterRegistryHandle(adapterHandle);
}
CloseDlcRegistryHandle(dlcHandle);
}
return status;
}
NTSTATUS
OpenDlcRegistryHandle(
IN PUNICODE_STRING RegistryPath,
OUT PHANDLE DlcRegistryHandle
)
/*++
Routine Description:
Opens a handle to the DLC section in the registry
Arguments:
RegistryPath - pointer to UNICODE_STRING giving full registry path to
DLC section
DlcRegistryHandle - returned handle
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
OBJECT_ATTRIBUTES objectAttributes;
NTSTATUS status;
ULONG disposition;
ASSUME_IRQL(PASSIVE_LEVEL);
InitializeObjectAttributes(&objectAttributes,
RegistryPath,
OBJ_CASE_INSENSITIVE,
NULL,
NULL
);
status = ZwCreateKey(DlcRegistryHandle,
KEY_WRITE, // might want to update something in registry
&objectAttributes,
0, // title index
NULL, // class
0, // create options
&disposition
);
#if DBG
if (DebugConfig) {
if (!NT_SUCCESS(status)) {
DbgPrint("DLC.OpenDlcRegistryHandle: Error: %08x\n", status);
}
}
#endif
return status;
}
NTSTATUS
OpenDlcAdapterRegistryHandle(
IN HANDLE DlcRegistryHandle,
IN PUNICODE_STRING AdapterName,
OUT PHANDLE DlcAdapterRegistryHandle,
OUT PBOOLEAN Created
)
/*++
Routine Description:
Opens a handle to the DLC\Parameters\<AdapterName> section in the registry.
If this node does not exist, it is created
Arguments:
DlcRegistryHandle - open handle to DLC section in registry
AdapterName - name of adapter in Parameters section. This
MUST be of the form \Device\<adapter_name>
DlcAdapterRegistryHandle - returned open handle
Created - returned TRUE if the handle was created
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
UNICODE_STRING keyName;
UNICODE_STRING adapterName;
WCHAR keyBuffer[sizeof(PARAMETERS_STRING) + MAX_ADAPTER_NAME_LENGTH];
OBJECT_ATTRIBUTES objectAttributes;
NTSTATUS status;
ULONG disposition;
ASSUME_IRQL(PASSIVE_LEVEL);
keyName.Buffer = keyBuffer;
keyName.Length = 0;
keyName.MaximumLength = sizeof(keyBuffer);
RtlCopyUnicodeString(&keyName, &ParametersPath);
RtlInitUnicodeString(&adapterName, AdapterName->Buffer);
adapterName.Buffer += sizeof(L"\\Device") / sizeof(L"") - 1;
adapterName.Length -= sizeof(L"\\Device") - sizeof(L"");
adapterName.MaximumLength -= sizeof(L"\\Device") - sizeof(L"");
RtlAppendUnicodeStringToString(&keyName, &adapterName);
InitializeObjectAttributes(&objectAttributes,
&keyName,
OBJ_CASE_INSENSITIVE,
DlcRegistryHandle,
NULL
);
//
// if the DLC\Parameters\<adapter_name> key does not exist, then we will
// create it
//
status = ZwCreateKey(DlcAdapterRegistryHandle,
KEY_WRITE,
&objectAttributes,
0,
NULL,
0,
&disposition
);
*Created = (disposition == REG_CREATED_NEW_KEY);
#if DBG
if (DebugConfig) {
if (!NT_SUCCESS(status)) {
DbgPrint("DLC.OpenDlcAdapterRegistryHandle: Error: %08x\n", status);
}
}
#endif
return status;
}
NTSTATUS
GetRegistryParameter(
IN HANDLE KeyHandle,
IN PDLC_REGISTRY_PARAMETER Parameter,
IN BOOLEAN SetOnFail
)
/*++
Routine Description:
Retrieves a parameter from a section of the registry. If the section cannot
be accessed or returns invalid data, then we get the default value from the
Parameter structure
Arguments:
KeyHandle - open handle to the required section in the registry
Parameter - pointer to DLC_REGISTRY_PARAMETER structure giving address and
type of the parameter to be retrieved, etc.
SetOnFail - if we fail to get the value from the registry, we try to set
the default value in the registry
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
NTSTATUS status;
UNICODE_STRING parameterName;
UCHAR informationBuffer[MAX_INFORMATION_BUFFER_LENGTH];
PKEY_VALUE_FULL_INFORMATION valueInformation = (PKEY_VALUE_FULL_INFORMATION)informationBuffer;
ULONG informationLength;
ASSUME_IRQL(PASSIVE_LEVEL);
RtlInitUnicodeString(&parameterName, Parameter->ParameterName);
status = ZwQueryValueKey(KeyHandle,
&parameterName,
KeyValueFullInformation,
(PVOID)valueInformation,
sizeof(informationBuffer),
&informationLength
);
if (NT_SUCCESS(status) && valueInformation->DataLength) {
//
// use the value retrieved from the registry
//
status = DlcpGetParameter(Parameter->ParameterName,
valueInformation->Type,
(PVOID)&informationBuffer[valueInformation->DataOffset],
valueInformation->DataLength,
NULL,
(PVOID)&Parameter->Descriptor
);
} else {
#if DBG
if (DebugConfig) {
if (!NT_SUCCESS(status)) {
DbgPrint("DLC.GetRegistryParameter: Error: %08x\n", status);
} else {
DbgPrint("DLC.GetRegistryParameter: Error: valueInformation->DataLength is 0\n");
}
}
#endif
if (!NT_SUCCESS(status) && SetOnFail) {
SetRegistryParameter(KeyHandle, Parameter);
}
//
// set the default value
//
status = DlcpGetParameter(Parameter->ParameterName,
Parameter->Descriptor.Type,
Parameter->Descriptor.Value,
Parameter->Descriptor.Length,
NULL,
(PVOID)&Parameter->Descriptor
);
}
return status;
}
NTSTATUS
SetRegistryParameter(
IN HANDLE KeyHandle,
IN PDLC_REGISTRY_PARAMETER Parameter
)
/*++
Routine Description:
Sets a parameter in the DLC\Parameters\<AdapterName> section
Arguments:
KeyHandle - open handle to required section in registry
Parameter - pointer to DLC_REGISTRY_PARAMETER containing all required
parameter information
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
NTSTATUS status;
UNICODE_STRING name;
ASSUME_IRQL(PASSIVE_LEVEL);
RtlInitUnicodeString(&name, Parameter->ParameterName);
status = ZwSetValueKey(KeyHandle,
&name,
0, // TitleIndex
Parameter->Descriptor.Type,
Parameter->Descriptor.Value,
Parameter->Descriptor.Length
);
#if DBG
if (DebugConfig) {
if (!NT_SUCCESS(status)) {
DbgPrint("DLC.SetRegistryParameter: Error: %08x\n", status);
}
}
#endif
return status;
}
NTSTATUS
DlcpGetParameter(
IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext
)
/*++
Routine Description:
Call-back function which copies the data retrieved from the registry to
a variable
Arguments:
ValueName - pointer to name of parameter being set (ignored)
ValueType - type of parameter being set
ValueData - pointer to data retrieved from registry
ValueLength - length of data retrieved
Context - ignored
EntryContext - pointer to REGISTRY_PARAMETER_DESCRIPTOR structure
Return Value:
NTSTATUS
Success - STATUS_SUCCESS
Failure -
--*/
{
#define Descriptor ((PREGISTRY_PARAMETER_DESCRIPTOR)EntryContext)
//
// if we have a registry entry for the parameter, but it is a different
// type from that expected (say REG_SZ instead of REG_DWORD) then we use
// the default type, length and value
//
if (ValueType != Descriptor->Type) {
#if DBG
DbgPrint("DLC.DlcpGetParameter: Error: type for %ws is %d, expected %d, using default\n",
ValueName,
ValueType,
Descriptor->Type
);
#endif
ValueType = Descriptor->Type;
ValueData = Descriptor->Value;
ValueLength = Descriptor->Length;
}
switch (ValueType) {
case REG_DWORD: {
ULONG value;
if (Descriptor->RealType == PARAMETER_IS_BOOLEAN) {
value = (*(PULONG)ValueData != 0);
*(PBOOLEAN)(Descriptor->Variable) = (BOOLEAN)value;
//
// no limit check for BOOLEAN type
//
break;
} else {
value = *(PULONG)ValueData;
}
//
// check range. If outside range, use default. Comparison is ULONG
//
if (value < Descriptor->LowerLimit || value > Descriptor->UpperLimit) {
#if DBG
DbgPrint("DLC.DlcpGetParameter: Error: Parameter %ws = %d: Out of range (%d..%d). Using default = %d\n",
ValueName,
value,
Descriptor->LowerLimit,
Descriptor->UpperLimit,
*(PULONG)(Descriptor->Value)
);
#endif
value = *(PULONG)(Descriptor->Value);
}
if (Descriptor->RealType == PARAMETER_IS_UCHAR) {
*(PUCHAR)(Descriptor->Variable) = (UCHAR)value;
} else {
*(PULONG)(Descriptor->Variable) = value;
}
break;
}
#if DBG
default:
DbgPrint("DLC.DlcpGetParameter: Error: didn't expect ValueType %d\n", ValueType);
#endif
}
return STATUS_SUCCESS;
#undef pDescriptor
}
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