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Added function for decoding GPRS RLC/MAC uplink data block.

This commit is contained in:
Ivan Kluchnikov 2012-02-05 01:41:25 +04:00 committed by Ivan Kluchnikov
parent 9c2c699435
commit d5f0133eb2
2 changed files with 121 additions and 0 deletions
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75
gsm_rlcmac.cpp
View File

@ -5294,3 +5294,78 @@ void encode_gsm_rlcmac_downlink(BitVector * vector, RlcMacDownlink_t * data)
break;
}
}
void decode_gsm_rlcmac_uplink_data(BitVector * vector, RlcMacUplinkDataBlock_t * data)
{
size_t readIndex = 0;
//unsigned dataLen = 0;
guint8 payload_type = vector->readField(readIndex, 2);
if (payload_type == PAYLOAD_TYPE_DATA)
{
readIndex = 0;
// MAC header
data->PAYLOAD_TYPE = vector->readField(readIndex, 2);
data->CV = vector->readField(readIndex, 4);
data->SI = vector->readField(readIndex, 1);
data->R = vector->readField(readIndex, 1);
LOG(INFO) << " PAYLOAD_TYPE = " << (unsigned)(data->PAYLOAD_TYPE);
LOG(INFO) << " CV = " << (unsigned)(data->CV);
LOG(INFO) << " SI = " << (unsigned)(data->SI);
LOG(INFO) << " R = " << (unsigned)(data->R);
// Octet 1
data->spare = vector->readField(readIndex, 1);
data->PI = vector->readField(readIndex, 1);
data->TFI = vector->readField(readIndex, 5);
data->TI = vector->readField(readIndex, 1);
LOG(INFO) << " spare = " << (unsigned)(data->spare);
LOG(INFO) << " PI = " << (unsigned)(data->PI);
LOG(INFO) << " TFI = " << (unsigned)(data->TFI);
LOG(INFO) << " TI = " << (unsigned)(data->TI);
// Octet 2
data->BSN = vector->readField(readIndex, 7);
data->E_1 = vector->readField(readIndex, 1);
LOG(INFO) << " BSN = " << (unsigned)(data->BSN);
LOG(INFO) << " E_1 = " << (unsigned)(data->E_1);
if(data->E_1 == 0) // Extension octet follows immediately
{
// Octet 3 (optional)
unsigned i = 0;
do
{
data->LENGTH_INDICATOR[i] = vector->readField(readIndex, 6);
data->M[i] = vector->readField(readIndex, 1);
data->E[i] = vector->readField(readIndex, 1);
LOG(INFO) << " LENGTH_INDICATOR[" << i << "] = " << (unsigned)(data->LENGTH_INDICATOR[i]);
LOG(INFO) << " M[" << i << "] = " << (unsigned)(data->M[i]);
LOG(INFO) << " E[" << i << "] = " << (unsigned)(data->E[i]);
i++;
} while((data->M[i-1] == 1)&&(data->E[i-1] == 0));
}
if(data->TI == 1) // TLLI field is present
{
data->TLLI = vector->readField(readIndex, 32);
LOG(INFO) << " TLLI = " << data->TLLI;
if (data->PI == 1) // PFI is present if TI field indicates presence of TLLI
{
data->PFI = vector->readField(readIndex, 7);
data->E_2 = vector->readField(readIndex, 1);
LOG(INFO) << " PFI = " << (unsigned)(data->PFI);
LOG(INFO) << " E_2 = " << (unsigned)(data->E_2);
}
}
unsigned dataLen = 23 - readIndex/8;
for (unsigned i = 0; i < dataLen; i++)
{
data->RLC_DATA[i] = vector->readField(readIndex, 8);
LOG(INFO) << " DATA[" << i << "] = " << (unsigned)(data->RLC_DATA[i]);
}
LOG(INFO) << "\n";
}
else
{
LOG(INFO) << "Payload Type: RESERVED (3)";
return;
}
}

46
gsm_rlcmac.h
View File

@ -43,6 +43,9 @@
#define POST_PACKED
#endif
//TODO Check this number
#define MAX_NUMBER_LLC_PDU 5
typedef guint8 TFI_t;
typedef guint8 N32_t;
@ -4946,6 +4949,48 @@ typedef struct
gint16 NrOfBits;
} RlcMacUplink_t;
/* < Uplink RLC/MAC data block message > */
typedef struct
{
guint8 PAYLOAD_TYPE;
guint8 CV;
guint8 SI;
guint8 R;
guint8 spare;
guint8 PI;
guint8 TFI;
guint8 TI;
guint8 BSN;
guint8 E_1;
guint8 LENGTH_INDICATOR[MAX_NUMBER_LLC_PDU];
guint8 M[MAX_NUMBER_LLC_PDU];
guint8 E[MAX_NUMBER_LLC_PDU];
guint32 TLLI;
guint8 PFI;
guint8 E_2;
guint8 RLC_DATA[20];
guint8 MESSAGE_TYPE;
} RlcMacUplinkDataBlock_t;
/* < Downlink RLC/MAC data block message > */
typedef struct
{
guint8 PAYLOAD_TYPE;
guint8 RRBP;
guint8 SP;
guint8 USF;
guint8 PR;
guint8 TFI;
guint8 FBI;
guint8 BSN;
guint8 E_1;
guint8 LENGTH_INDICATOR[MAX_NUMBER_LLC_PDU];
guint8 M[MAX_NUMBER_LLC_PDU];
guint8 E[MAX_NUMBER_LLC_PDU];
guint8 RLC_DATA[20];
guint8 MESSAGE_TYPE;
} RlcMacDownlinkDataBlock_t;
void GPRSMSG_Profile(gint16 i);
@ -5080,5 +5125,6 @@ typedef struct
void decode_gsm_rlcmac_downlink(BitVector * vector, RlcMacDownlink_t * data);
void encode_gsm_rlcmac_downlink(BitVector * vector, RlcMacDownlink_t * data);
void encode_gsm_rlcmac_uplink(BitVector * vector, RlcMacUplink_t * data);
void decode_gsm_rlcmac_uplink_data(BitVector * vector, RlcMacUplinkDataBlock_t * data);
#endif /* __PACKET_GSM_RLCMAC_H__ */