/// <summary>
/// Predicate for post-processing filters.
/// </summary>
/// <param name="t">tag data to screen</param>
/// <returns>Return true to allow tag through the filter.
/// Return false to reject tag.</returns>
public bool Matches(ThingMagic.TagData t)
{
throw new NotSupportedException();
}
/// <summary>
/// Test if a tag Matches this filter. Only applies to selects based
/// on the EPC.
/// </summary>
/// <param name="t">tag data to screen</param>
/// <returns>Return true to allow tag through the filter.
/// Return false to reject tag.</returns>
public bool Matches(ThingMagic.TagData t)
{
bool match = true;
int i, bitAddr;
if (Bank != Bank.EPC)
throw new NotSupportedException("Can't match against non-EPC memory");
i = 0;
bitAddr = (int)BitPointer;
// Matching against the CRC and PC does not have defined
// behavior; see section 6.3.2.11.1.1 of Gen2 version 1.2.0.
// We choose to let it match, because that's simple.
bitAddr -= 32;
if (bitAddr < 0)
{
i -= bitAddr;
bitAddr = 0;
}
for (; i < BitLength; i++, bitAddr++)
{
if (bitAddr > (t.EpcBytes.Length * 8))
{
match = false;
break;
}
// Extract the relevant bit from both the EPC and the mask.
if (((t.EpcBytes[bitAddr / 8] >> (7 - (bitAddr & 7))) & 1) !=
((Mask[i / 8] >> (7 - (i & 7))) & 1))
{
match = false;
break;
}
}
if (Invert)
match = match ? false : true;
return match;
}
