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[UMPNPMGR] PNP_GetDeviceListSize: Implement the buffer size calculation for a list of all device instances.

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This commit is contained in:
Eric Kohl 2018-12-30 14:42:12 +01:00
parent 1a9b9800b1
commit 969de9062c
1 changed files with 39 additions and 2 deletions
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41
base/services/umpnpmgr/umpnpmgr.c
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@ -886,6 +886,41 @@ GetEnumeratorInstanceListSize(
}
static
CONFIGRET
GetAllInstanceListSize(
_In_ LPCWSTR pszEnumerator,
_Out_ PULONG pulLength)
{
WCHAR szEnumeratorBuffer[MAX_DEVICE_ID_LEN];
DWORD dwIndex, dwEnumeratorLength, dwBufferLength;
DWORD dwError;
CONFIGRET ret = CR_SUCCESS;
for (dwIndex = 0; ; dwIndex++)
{
dwEnumeratorLength = MAX_DEVICE_ID_LEN;
dwError = RegEnumKeyExW(hEnumKey,
dwIndex,
szEnumeratorBuffer,
&dwEnumeratorLength,
NULL, NULL, NULL, NULL);
if (dwError != ERROR_SUCCESS)
break;
/* Get the size of all device instances for the enumerator */
ret = GetEnumeratorInstanceListSize(szEnumeratorBuffer,
&dwBufferLength);
if (ret != CR_SUCCESS)
break;
*pulLength += dwBufferLength;
}
return ret;
}
/* Function 11 */
DWORD
WINAPI
@ -902,7 +937,8 @@ PNP_GetDeviceListSize(
CONFIGRET ret = CR_SUCCESS;
NTSTATUS Status;
DPRINT("PNP_GetDeviceListSize() called\n");
DPRINT("PNP_GetDeviceListSize(%p %S %p 0x%lx)\n",
hBinding, pszFilter, pulLength, ulFlags);
if (ulFlags & ~CM_GETIDLIST_FILTER_BITS)
return CR_INVALID_FLAG;
@ -980,7 +1016,8 @@ PNP_GetDeviceListSize(
}
else /* CM_GETIDLIST_FILTER_NONE */
{
ret = CR_CALL_NOT_IMPLEMENTED;
ret = GetAllInstanceListSize(pszFilter,
pulLength);
}
/* Add one character for the terminating double UNICODE_NULL */