public unsafe void SetNumExact(USBFILTERIDX enmFieldIdx, UInt16 u16Value, bool fMustBePresent)
{
if (!IsNumericField(enmFieldIdx))
{
throw new ArgumentOutOfRangeException("enmFieldIdx");
}
DeleteAnyStringValue(enmFieldIdx);
fixed(USBFILTER *pFilter = &this)
{
USBFILTERFIELD *aFields = (USBFILTERFIELD *)pFilter->aFields;
aFields[(int)enmFieldIdx].u16Value = u16Value;
aFields[(int)enmFieldIdx].enmMatch = fMustBePresent ? USBFILTERMATCH.USBFILTERMATCH_NUM_EXACT : USBFILTERMATCH.USBFILTERMATCH_NUM_EXACT_NP;
}
}
unsafe void DeleteAnyStringValue(USBFILTERIDX enmFieldIdx)
{
fixed(USBFILTER *pFilter = &this)
{
USBFILTERFIELD *aFields = (USBFILTERFIELD *)pFilter->aFields;
if (IsMethodUsingStringValue((USBFILTERMATCH)aFields[(int)enmFieldIdx].enmMatch) && aFields[(int)enmFieldIdx].u16Value != 0)
{
SetString(enmFieldIdx, new Byte[0]);
}
else if (enmFieldIdx >= USBFILTERIDX.USBFILTERIDX_END)
{
throw new ArgumentOutOfRangeException("enmFieldIdx");
}
}
}
public unsafe void SetString(USBFILTERIDX enmFieldIdx, Byte[] pszString)
{
fixed(USBFILTER *pFilter = &this)
{
USBFILTERFIELD *aFields = (USBFILTERFIELD *)pFilter->aFields;
if (IsMethodUsingStringValue((USBFILTERMATCH)aFields[(int)enmFieldIdx].enmMatch) && aFields[(int)enmFieldIdx].u16Value != 0)
{
int off = aFields[(int)enmFieldIdx].u16Value;
aFields[(int)enmFieldIdx].u16Value = 0; /* Assign it to the NULL string. */
int cchShift = strlen(&pFilter->achStrTab[off]) + 1;
int cchToMove = ((int)offCurEnd + 1) - (off + cchShift);
if (cchToMove > 0)
{
memmove(&pFilter->achStrTab[off], &pFilter->achStrTab[off + cchShift], cchToMove);
for (int i = 0; i < (int)USBFILTERIDX.USBFILTERIDX_END; i++)
{
if (aFields[i].u16Value >= off && IsMethodUsingStringValue(aFields[i].enmMatch))
{
aFields[i].u16Value -= (ushort)cchShift;
}
}
}
offCurEnd -= (uint)cchShift;
memset(&pFilter->achStrTab[offCurEnd], 0, cchShift);
}
if (pszString.Length == 0)
{
aFields[(int)enmFieldIdx].u16Value = 0;
}
else
{
int cch = pszString.Length;
if (this.offCurEnd + cch + 2 > 256)
{
throw new IndexOutOfRangeException("Buffer overflow");
}
aFields[(int)enmFieldIdx].u16Value = (ushort)(this.offCurEnd + 1);
for (int i = 0; i < cch + 1; i++)
{
pFilter->achStrTab[offCurEnd + 1 + i] = pszString[i];
}
offCurEnd += (uint)cch + 1;
}
}
}
static Boolean IsNumericField(USBFILTERIDX enmFieldIdx)
{
switch (enmFieldIdx)
{
case USBFILTERIDX.USBFILTERIDX_VENDOR_ID:
case USBFILTERIDX.USBFILTERIDX_PRODUCT_ID:
case USBFILTERIDX.USBFILTERIDX_DEVICE_REV:
case USBFILTERIDX.USBFILTERIDX_DEVICE_CLASS:
case USBFILTERIDX.USBFILTERIDX_DEVICE_SUB_CLASS:
case USBFILTERIDX.USBFILTERIDX_DEVICE_PROTOCOL:
case USBFILTERIDX.USBFILTERIDX_BUS:
case USBFILTERIDX.USBFILTERIDX_PORT:
return(true);
case USBFILTERIDX.USBFILTERIDX_MANUFACTURER_STR:
case USBFILTERIDX.USBFILTERIDX_PRODUCT_STR:
case USBFILTERIDX.USBFILTERIDX_SERIAL_NUMBER_STR:
return(false);
default:
throw new ArgumentOutOfRangeException("enmFieldIdx");
}
}