/////////////////////////////////////////////////////////////////////////////// // // // Copyright Test Competence Center (TCC) ETH 2008 // // // // The copyright to the computer program(s) herein is the property of TCC. // // The program(s) may be used and/or copied only with the written permission // // of TCC or in accordance with the terms and conditions stipulated in the // // agreement/contract under which the program(s) has been supplied. // // // /////////////////////////////////////////////////////////////////////////////// // // File: LLC_EncDec.cc // Rev: R1A0 // Prodnr: CNL 113 577 // Updated: 2008-01-22 // Contact: http://ttcn.ericsson.se // Reference: 3GPP TS 44.064 7.1.0 #include "LLC_Types.hh" #include // GIVEN IN CODE RECEIVED FROM ERV #define CRC_POLY_LLC2 0xad85dd // GIVEN IN SPECIFICATION //#define CRC_POLY_LLC2 0xbba1b5 #define TABLE_LENGTH 256 // For UI frames if PM bit is 0 (unprotected) then CRC will be calculated over Header + N202 octets #define N202 4 unsigned int mCRCTable[TABLE_LENGTH]; static void BuildCrc24Table() { unsigned int i,j; unsigned int reg; //TRACE_FUNC( "BuildCrc24Table" ); for( i = 0; i < TABLE_LENGTH; i++ ) { reg = i; for( j = 8; j > 0; j-- ) { if( reg & 1 ) { reg = (reg>>1) ^ (unsigned int) CRC_POLY_LLC2; } else { reg >>= 1; } } reg &= 0x00ffffffL; mCRCTable[i] = (unsigned int)reg; //TTCN_Logger::begin_event(TTCN_DEBUG); //TTCN_Logger::log_event("mCRCTable[%d]= %d",i,mCRCTable[i]); // TTCN_Logger::end_event(); } } //--------------------------------------------------------------------------------------- unsigned int Calculate_CRC(TTCN_Buffer& pdu) { const unsigned char* loc_pdu = pdu.get_data(); //TTCN_Logger::begin_event(TTCN_DEBUG); //for (size_t i =0; i< pdu.get_len();i++) // { // TTCN_Logger::log_event("%02x ",loc_pdu[i]); // } //TTCN_Logger::log_event("\n"); //TTCN_Logger::end_event(); BuildCrc24Table(); //TTCN_Logger::begin_event(TTCN_DEBUG); //TTCN_Logger::log_event("mCRCTable[%d]= %d\n",255,mCRCTable[255]); //TTCN_Logger::log_event("mCRCTable[%d]= 0x%08x (%u)",255,mCRCTable[255]); //TTCN_Logger::log_event("\n"); //TTCN_Logger::end_event(); unsigned int reg = 0xFFFFFF; unsigned int length = pdu.get_len(); if ( ((loc_pdu[1] >>5) & 0x07) == 0x06 ) //UI frame { if ((loc_pdu[2] & 0x01) == 0x00) // PM bit is 0 (unprotected) { if(length > 3 + N202) // pdu length is longer than header + N202 { length = 3 + N202; // length = header length + N202 } } } while ( length--) { reg = ((reg>>8) & 0x00ffff)^mCRCTable[(reg^*((unsigned char*)loc_pdu++)) & 0xffL]; } //TTCN_Logger::log(TTCN_DEBUG, "reg:%08x\n",reg); // 1's complement of FCS reg ^= 0xffffffL; reg = ((reg >> 16) & 0x000000ff)+ ((reg) & 0x0000ff00) + ((reg <<16 )& 0x00ff0000); //unsigned int tempint = *(unsigned int*)loc_crcBuffer; //reg = (unsigned int*)loc_crcBuffer ; //TTCN_Logger::log(TTCN_DEBUG, "reg:%08x\n",reg); return reg & 0x00ffffffL; } //--------------------------------------------------------------------------------------- namespace LLC__Types { OCTETSTRING enc__PDU__LLC(const PDU__LLC& pdu) { TTCN_Buffer bb; PDU__LLC pdu2(pdu); if (pdu2.get_selection() == PDU__LLC::ALT_pDU__LLC__U) { if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_uA) {int record_of_size = pdu2.pDU__LLC__U().information__field__U().uA().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().uA()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().uA()[i].xID__Data().l3param().lengthof(); } } } } if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_sABM) {int record_of_size = pdu2.pDU__LLC__U().information__field__U().sABM().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().sABM()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().sABM()[i].xID__Data().l3param().lengthof(); } } } } if (pdu2.pDU__LLC__U().information__field__U().get_selection() == Information__field__U::ALT_xID) {int record_of_size = pdu2.pDU__LLC__U().information__field__U().xID().size_of(); for (int i = 0; i < (record_of_size) ; i++) { // AUTOMATICALLY CALCULATE WHICH LENGTH FORMAT SHOULD BE USED AND CHANGE SHORT LENGTH FORM // TO LONG LENGTH FORM IF NECESSARY WHEN L3 PDU IS INCLUDED if ( pdu2.pDU__LLC__U().information__field__U().xID()[i].typefield() == int2bit(11,5) ) { if( pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__Data().l3param().lengthof() > 3) { pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__length().long__len() = pdu2.pDU__LLC__U().information__field__U().xID()[i].xID__Data().l3param().lengthof(); } } } } } if (pdu2.get_selection() == PDU__LLC::ALT_pDU__LLC__U) { if ( pdu2.pDU__LLC__U().fCS().ispresent()) { if ( pdu2.pDU__LLC__U().fCS() == int2oct(0,3) ) // IF ENCODER NEEDS TO GENERATE CRC { pdu2.pDU__LLC__U().fCS() = OMIT_VALUE; pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } else { // IF ENCODER SENDS OUT NONZERO CRC GIVEN IN TTCN TEMPLATE pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else { //FCS OMIT pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else if (pdu2.get_selection() == PDU__LLC::ALT_pDU__LLC__UI) { if ( pdu2.pDU__LLC__UI().fCS().ispresent()) { if ( pdu2.pDU__LLC__UI().fCS() == int2oct(0,3) ) // IF ENCODER NEEDS TO GENERATE CRC { pdu2.pDU__LLC__UI().fCS() = OMIT_VALUE; pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } else { // IF ENCODER SENDS OUT NONZERO CRC GIVEN IN TTCN TEMPLATE pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else { //FCS OMIT pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); unsigned int crcBuffer = Calculate_CRC(bb); bb.put_os(int2oct(crcBuffer,3)); return OCTETSTRING (bb.get_len(), bb.get_data()); } } else {TTCN_error("Can not encode LLC PDU"); //Neither UI NOR U return OCTETSTRING (bb.get_len(), bb.get_data()); // this is dummy to avoid warning during compilation } //pdu2.encode(PDU__LLC_descr_ ,bb, TTCN_EncDec::CT_RAW); //unsigned int crcBuffer = Calculate_CRC(bb); //bb.put_os( int2oct(crcBuffer,3)); //return OCTETSTRING (bb.get_len(), bb.get_data()); } OCTETSTRING enc__PDU__LLC(const PDU__LLC_template& pdu) { return enc__PDU__LLC(pdu.valueof()); } PDU__LLC dec__PDU__LLC(const OCTETSTRING& stream) { PDU__LLC retv; TTCN_Buffer bb; OCTETSTRING crc = int2oct(0,3); size_t datalength = stream.lengthof()-3; const unsigned char * CRC_AS_RECEIVED = (const unsigned char *)stream+datalength; bb.put_s(datalength,(const unsigned char *)stream); unsigned int CRC_CALCULATED = Calculate_CRC(bb); // COMPARE CRC RECEIVED IN LLC PDU WITH CRC CALCULATED FROM LLC PDU if( (CRC_AS_RECEIVED[ 0 ] != (CRC_CALCULATED & 0xff0000 ) >> 16) || (CRC_AS_RECEIVED[ 1 ] != (CRC_CALCULATED & 0xff00 ) >> 8) || (CRC_AS_RECEIVED[ 2 ] != (CRC_CALCULATED & 0xff ) ) ) { TTCN_warning("CRC ERROR IN LLC PDU"); // CRC IS NOT AS EXPECTED crc=OCTETSTRING(3,CRC_AS_RECEIVED); } // CRC IS // FILL CRC octets with zeroes if CRC is OK retv.decode(PDU__LLC_descr_, bb, TTCN_EncDec::CT_RAW); if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__UI){ retv.pDU__LLC__UI().fCS() = crc; } if (retv.get_selection() == PDU__LLC::ALT_pDU__LLC__U){ retv.pDU__LLC__U().fCS() = crc; } return retv; } }//namespace