void TLUserData::write(TLFrame& dest, size_t& wp) const
{
#if 1
// First write TP-User-Data-Length
dest.writeField(wp,mLength,8);
// Then write TP-User-Data
// This tail() works because UD is always the last field in the PDU.
BitVector ud_dest = dest.tail(wp);
mRawData.copyTo(ud_dest);
ud_dest.LSB8MSB();
#else
// Stuff we don't support...
assert(!mUDHI);
assert(mDCS==0);
unsigned numChar = strlen(mData);
dest.writeField(wp,numChar,8);
// This tail() works because UD is always the last field in the PDU.
BitVector chars = dest.tail(wp);
chars.zero();
for (unsigned i=0; i<numChar; i++) {
char gsm = encodeGSMChar(mData[i]);
dest.writeFieldReversed(wp,gsm,7);
}
chars.LSB8MSB();
#endif
}
void TLUserData::write(TLFrame& dest, size_t& wp) const
{
// Stuff we don't support...
assert(!mUDHI);
assert(mDCS==0);
unsigned numChar = strlen(mData);
dest.writeField(wp,numChar,8);
// This tail() works because UD is always the last field in the PDU.
BitVector chars = dest.tail(wp);
chars.zero();
for (unsigned i=0; i<numChar; i++) {
char gsm = encodeGSMChar(mData[i]);
dest.writeFieldReversed(wp,gsm,7);
}
chars.LSB8MSB();
}
// Return decoded frame if success and B == 3, otherwise NULL.
static BitVector *decodeLowSide(const RxBurst &inBurst, int B, GprsDecoder &decoder, ChannelCodingType *ccPtr)
{
inBurst.data1().copyToSegment(decoder.mI[B],0);
inBurst.data2().copyToSegment(decoder.mI[B],57);
// Save the stealing bits:
// TODO: Save these as floats and do a correlation to pick the encoding.
decoder.qbits[2*B] = inBurst.Hl();
decoder.qbits[2*B+1] = inBurst.Hu();
if (B != 3) { return NULL; }
decoder.deinterleave();
bool success;
BitVector *result;
switch ((*ccPtr = decoder.getCS())) {
case ChannelCodingCS4:
success = decoder.decodeCS4();
LOG(DEBUG) << "CS-4 success=" << success;
result = &decoder.mD_CS4;
break;
case ChannelCodingCS1:
success = decoder.decode();
LOG(DEBUG) << "CS-1 success=" << success;
result = &decoder.mD;
break;
default: devassert(0); // Others not supported yet.
return NULL;
}
if (success) {
result->LSB8MSB();
return result;
}
return NULL;
}
