| /////////////////////////////////////////////////////////////////////////////// |
| // // |
| // Copyright Test Competence Center (TCC) ETH 2016 // |
| // // |
| // 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: GTPU_EncDec.cc |
| // Rev: R1B |
| // Prodnr: CNL 113 843 |
| // Contact: http://ttcn.ericsson.se |
| // Reference: 3GPP TS 29.060 v13.5.0 |
| |
| #include "GTPU_Types.hh" |
| |
| namespace GTPU__Types { |
| |
| // find the length of the optional part and decode optional part into OPT_PART |
| int find_optpart_length(const unsigned char * opt_part_ptr,GTPU__Header__optional__part& OPT_PART)// pointer to opt part start |
| { |
| int opt_part_length = 4; // mandatory minimum length of opt_part |
| OPT_PART.sequenceNumber() = OCTETSTRING(2,opt_part_ptr); |
| OPT_PART.npduNumber() = OCTETSTRING(1,opt_part_ptr+2); |
| OPT_PART.nextExtHeader() = OCTETSTRING(1,opt_part_ptr+3); |
| OPT_PART.gTPU__extensionHeader__List() = OMIT_VALUE; |
| |
| int i = 0; |
| bool opt_part_end = false; |
| while(!opt_part_end) |
| { |
| if (opt_part_ptr[opt_part_length-1] != 0x00) // 0x00 means end of optional part |
| { |
| unsigned char lengthfield = opt_part_ptr[opt_part_length]; |
| |
| OPT_PART.gTPU__extensionHeader__List()()[i].lengthfield() = lengthfield; |
| OPT_PART.gTPU__extensionHeader__List()()[i].content() = |
| OCTETSTRING(4*lengthfield-2,opt_part_ptr + opt_part_length +1); |
| OPT_PART.gTPU__extensionHeader__List()()[i].nextExtHeader() = |
| OCTETSTRING(1,opt_part_ptr + opt_part_length + 4*lengthfield - 1); |
| |
| opt_part_length = opt_part_length + 4*lengthfield; |
| i++; |
| } |
| else |
| {opt_part_end = true;} |
| } |
| |
| return opt_part_length; |
| } |
| |
| ////////////////////////////////// |
| // Decoding function for GTPC__DialoguePDU |
| ////////////////////////////////// |
| PDU__GTPU dec__PDU__GTPU(const OCTETSTRING& udp__pdu) |
| { |
| TTCN_Buffer buf; |
| PDU__GTPU pdu; |
| |
| const unsigned char *gtpu_message = (const unsigned char *) udp__pdu; |
| |
| int opt_part_length = 0; |
| if ( gtpu_message[0] & 0x07 ) // opt_part is present |
| { |
| GTPU__Header__optional__part OPT_PART; |
| |
| // find the length of the optional part and decode optional part into OPT_PART |
| opt_part_length = find_optpart_length(gtpu_message+8,OPT_PART); |
| if( ((gtpu_message[2] << 8) + gtpu_message[3] - opt_part_length) < 0 ) |
| {TTCN_error("Decoding error, lengthf field is shorter that decoded length of opt_part");}; |
| |
| // build PDU without optional part |
| unsigned int gtpu_IEs_length = (gtpu_message[2] << 8) + gtpu_message[3] - opt_part_length; |
| unsigned char gtpuBuf[8 + gtpu_IEs_length]; |
| memcpy(gtpuBuf,gtpu_message,8); |
| memcpy(gtpuBuf+8,gtpu_message+8+opt_part_length,gtpu_IEs_length); |
| |
| // substitute dummy bits (indicating there is no optional part) |
| gtpuBuf[0] = gtpuBuf[0] & 0xf8; |
| |
| // substitute dummy length (not including optional part) |
| gtpuBuf[2] = (gtpu_IEs_length & 0xff00) >> 8; |
| gtpuBuf[3] = gtpu_IEs_length & 0xff; |
| |
| // RAW decoding |
| buf.put_s(8 + gtpu_IEs_length,gtpuBuf); |
| pdu.decode(PDU__GTPU_descr_, buf, TTCN_EncDec::CT_RAW); |
| buf.clear(); |
| |
| // put back the original values |
| unsigned char pn = gtpu_message[0] & 0x01; |
| pdu.pn__bit() = BITSTRING(1,&pn); |
| |
| unsigned char s = (gtpu_message[0] & 0x02) >> 1; |
| pdu.s__bit() = BITSTRING(1,&s); |
| |
| unsigned char e = (gtpu_message[0] & 0x04) >> 2; |
| pdu.e__bit() = BITSTRING(1,&e); |
| |
| pdu.lengthf() = (gtpu_message[2] << 8) + gtpu_message[3]; |
| |
| pdu.opt__part() = OPT_PART; |
| |
| return pdu; |
| } |
| else // opt_part is not present |
| { |
| buf.put_os(udp__pdu); |
| pdu.decode(PDU__GTPU_descr_, buf, TTCN_EncDec::CT_RAW); |
| buf.clear(); |
| return pdu; |
| } |
| } // end of function |
| |
| |
| }//namespace |