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[MSPORTS]

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Implement ComDBGetCurrentPortUsage.

svn path=/trunk/; revision=52087
This commit is contained in:
Eric Kohl 2011-06-05 12:20:52 +00:00
parent b92d45b853
commit d5f1454033
1 changed files with 97 additions and 2 deletions
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99
reactos/dll/win32/msports/comdb.c
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@ -270,8 +270,103 @@ ComDBGetCurrentPortUsage(IN HCOMDB hComDB,
IN DWORD ReportType,
OUT LPDWORD MaxPortsReported)
{
FIXME("ComDBGetCurrentPortUsage(%p)\n", hComDB);
return ERROR_CALL_NOT_IMPLEMENTED;
PCOMDB pComDB;
DWORD dwBitIndex;
DWORD dwByteIndex;
DWORD dwType;
DWORD dwSize;
PBYTE pBitmap = NULL;
BYTE cMask;
LONG lError = ERROR_SUCCESS;
if (hComDB == INVALID_HANDLE_VALUE ||
hComDB == NULL ||
(Buffer == NULL && MaxPortsReported == NULL) ||
(ReportType != CDB_REPORT_BITS && ReportType != CDB_REPORT_BYTES))
return ERROR_INVALID_PARAMETER;
pComDB = (PCOMDB)hComDB;
/* Wait for the mutex */
WaitForSingleObject(pComDB->hMutex, INFINITE);
/* Get the required bitmap size */
lError = RegQueryValueExW(pComDB->hKey,
L"ComDB",
NULL,
&dwType,
NULL,
&dwSize);
if (lError != ERROR_SUCCESS)
{
ERR("Failed to query the bitmap size!\n");
goto done;
}
/* Allocate the bitmap */
pBitmap = HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSize);
if (pBitmap == NULL)
{
ERR("Failed to allocate the bitmap!\n");
lError = ERROR_NOT_ENOUGH_MEMORY;
goto done;
}
/* Read the bitmap */
lError = RegQueryValueExW(pComDB->hKey,
L"ComDB",
NULL,
&dwType,
pBitmap,
&dwSize);
if (lError != ERROR_SUCCESS)
goto done;
if (Buffer == NULL)
{
*MaxPortsReported = dwSize * BITS_PER_BYTE;
}
else
{
if (ReportType == CDB_REPORT_BITS)
{
/* Clear the buffer */
memset(Buffer, 0, BufferSize);
memcpy(Buffer,
pBitmap,
min(dwSize, BufferSize));
if (MaxPortsReported != NULL)
*MaxPortsReported = min(dwSize, BufferSize) * BITS_PER_BYTE;
}
else if (ReportType == CDB_REPORT_BYTES)
{
/* Clear the buffer */
memset(Buffer, 0, BufferSize);
for (dwBitIndex = 0; dwBitIndex < min(dwSize * BITS_PER_BYTE, BufferSize); dwBitIndex++)
{
/* Calculate the byte index and a mask for the affected bit */
dwByteIndex = dwBitIndex / BITS_PER_BYTE;
cMask = 1 << (dwBitIndex % BITS_PER_BYTE);
if ((pBitmap[dwByteIndex] & cMask) != 0)
Buffer[dwBitIndex] = 1;
}
}
}
done:;
/* Release the mutex */
ReleaseMutex(pComDB->hMutex);
/* Release the bitmap */
HeapFree(GetProcessHeap(), 0, pBitmap);
return lError;
}