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// -*- c++ -*-
#ifndef _snap_packet_h
#define _snap_packet_h
typedef unsigned char byte;
class SNAP;
class SNAPTimeoutException {
};
class SNAPPacket
{
public:
/// An empty packet
SNAPPacket();
SNAPPacket(SNAP &snap) {
readPacket(snap);
}
/// Read a packet
bool readPacket(SNAP &snap);
/// Create a reply packet
SNAPPacket reply();
/// Send our content
bool send(SNAP &snap, bool verbose);
/// Length helper functions
int getLength() const {
int l = hdb1 & 0x0f;
if (l & 8) return 8 << (l & 7);
return l;
}
void setLength(int length) {
hdb1 = (hdb1 & 0xf0) | (length > 7 ? 8 : length);
}
bool isAck() {
return ((hdb2 & 3) == 2);
}
bool isNak() {
return ((hdb2 & 3) == 3);
}
byte sync;
byte hdb2;
byte hdb1;
byte dab;
byte sab;
byte payload[16];
byte crc;
private:
byte computeCRC(byte dataval);
};
#endif
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