| /* encoding.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| * Copyright (C) 2013 by Holger Hans Peter Freyther |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <encoding.h> |
| #include <gprs_rlcmac.h> |
| #include <bts.h> |
| #include <tbf.h> |
| #include <gprs_debug.h> |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| // GSM 04.08 9.1.18 Immediate assignment |
| int Encoding::write_immediate_assignment( |
| struct gprs_rlcmac_bts *bts, |
| bitvec * dest, uint8_t downlink, uint8_t ra, |
| uint32_t ref_fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, |
| uint8_t tfi, uint8_t usf, uint32_t tlli, |
| uint8_t polling, uint32_t fn, uint8_t single_block, uint8_t alpha, |
| uint8_t gamma, int8_t ta_idx) |
| { |
| unsigned wp = 0; |
| uint8_t plen; |
| |
| bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type |
| |
| // 10.5.2.25b Dedicated mode or TBF |
| bitvec_write_field(dest, wp,0x0,1); // spare |
| bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning |
| bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode |
| bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF). |
| |
| bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| |
| // GSM 04.08 10.5.2.25a Packet Channel Description |
| bitvec_write_field(dest, wp,0x1,5); // Channel type |
| bitvec_write_field(dest, wp,ts,3); // TN |
| bitvec_write_field(dest, wp,tsc,3); // TSC |
| bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion |
| bitvec_write_field(dest, wp,arfcn,10); // ARFCN |
| |
| //10.5.2.30 Request Reference |
| bitvec_write_field(dest, wp,ra,8); // RA |
| bitvec_write_field(dest, wp,(ref_fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,ref_fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,ref_fn % 26,5); // T2 |
| |
| // 10.5.2.40 Timing Advance |
| bitvec_write_field(dest, wp,0x0,2); // spare |
| bitvec_write_field(dest, wp,ta,6); // Timing Advance value |
| |
| // No mobile allocation in non-hopping systems. |
| // A zero-length LV. Just write L=0. |
| bitvec_write_field(dest, wp,0,8); |
| |
| if ((wp % 8)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest " |
| "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| exit (0); |
| } |
| plen = wp / 8; |
| |
| if (downlink) |
| { |
| // GSM 04.08 10.5.2.16 IA Rest Octets |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tfi,5); // TFI |
| bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| } |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| bitvec_write_field(dest, wp,polling,1); // Polling Bit |
| bitvec_write_field(dest, wp,!polling,1); // TA_VALID ??? |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| if (polling) { |
| bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present |
| bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present |
| } |
| bitvec_write_field(dest, wp,0x0,1); // P0 not present |
| // bitvec_write_field(dest, wp,0x1,1); // P0 not present |
| // bitvec_write_field(dest, wp,0xb,4); |
| } |
| else |
| { |
| // GMS 04.08 10.5.2.37b 10.5.2.16 |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment |
| if (single_block) { |
| bitvec_write_field(dest, wp, 0, 1); // Block Allocation : Single Block Allocation |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA = present |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| bitvec_write_field(dest, wp, 1, 1); // TBF_STARTING_TIME_FLAG |
| bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| } else { |
| bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation |
| bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity |
| bitvec_write_field(dest, wp, 0, 1); // POLLING |
| bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic |
| bitvec_write_field(dest, wp, usf, 3); // USF |
| bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp, 0, 1); // "0" power control: Not Present |
| bitvec_write_field(dest, wp, bts->initial_cs_ul-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| /* note: there is no choise for TAI and no starting time */ |
| bitvec_write_field(dest, wp, 0, 1); // switch TIMING_ADVANCE_INDEX = off |
| bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG |
| } |
| } |
| |
| return plen; |
| } |
| |
| /* generate uplink assignment */ |
| void Encoding::write_packet_uplink_assignment( |
| struct gprs_rlcmac_bts *bts, |
| bitvec * dest, uint8_t old_tfi, |
| uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, |
| struct gprs_rlcmac_ul_tbf *tbf, uint8_t poll, uint8_t alpha, |
| uint8_t gamma, int8_t ta_idx, int8_t use_egprs) |
| { |
| // TODO We should use our implementation of encode RLC/MAC Control messages. |
| unsigned wp = 0; |
| uint8_t ts; |
| |
| bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13) |
| bitvec_write_field(dest, wp,poll,1); // Suppl/Polling Bit |
| bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| bitvec_write_field(dest, wp,0xa,6); // MESSAGE TYPE |
| |
| bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| |
| bitvec_write_field(dest, wp,0x0,1); // switch PERSIST_LEVEL: off |
| if (use_tlli) { |
| bitvec_write_field(dest, wp,0x2,2); // switch TLLI : on |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // switch TFI : on |
| bitvec_write_field(dest, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI |
| bitvec_write_field(dest, wp,old_tfi,5); // TFI |
| } |
| |
| if (!use_egprs) { |
| bitvec_write_field(dest, wp,0x0,1); // Message escape |
| bitvec_write_field(dest, wp,tbf->current_cs().to_num()-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| bitvec_write_field(dest, wp,tbf->ta(),6); // TIMING_ADVANCE_VALUE |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| |
| } else { /* EPGRS */ |
| bitvec_write_field(dest, wp,0x1,1); // Message escape |
| bitvec_write_field(dest, wp,0x0,2); // EGPRS message contents |
| bitvec_write_field(dest, wp,0x0,1); // No CONTENTION_RESOLUTION_TLLI |
| bitvec_write_field(dest, wp,0x0,1); // No COMPACT reduced MA |
| bitvec_write_field(dest, wp,tbf->current_cs().to_num()-1, 4); // EGPRS Modulation and Coding IE |
| bitvec_write_field(dest, wp,0x0,1); // No RESEGMENT |
| bitvec_write_field(dest, wp,0x0,5); // EGPRS Window Size = 64 |
| bitvec_write_field(dest, wp,0x0,1); // No Access Technologies Request |
| bitvec_write_field(dest, wp,0x0,1); // No ARAC RETRANSMISSION REQUEST |
| bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| bitvec_write_field(dest, wp,0x0,1); // No BEP_PERIOD2 |
| |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| bitvec_write_field(dest, wp,tbf->ta(),6); // TIMING_ADVANCE_VALUE |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| |
| bitvec_write_field(dest, wp,0x0,1); // No Packet Extended Timing Advance |
| } |
| |
| #if 1 |
| bitvec_write_field(dest, wp,0x1,1); // Frequency Parameters information elements = present |
| bitvec_write_field(dest, wp,tbf->tsc(),3); // Training Sequence Code (TSC) |
| bitvec_write_field(dest, wp,0x0,2); // ARFCN = present |
| bitvec_write_field(dest, wp,tbf->trx->arfcn,10); // ARFCN |
| #else |
| bitvec_write_field(dest, wp,0x0,1); // Frequency Parameters = off |
| #endif |
| |
| bitvec_write_field(dest, wp,0x1,2); // Dynamic Allocation |
| |
| bitvec_write_field(dest, wp,0x0,1); // Extended Dynamic Allocation = off |
| bitvec_write_field(dest, wp,0x0,1); // P0 = off |
| |
| bitvec_write_field(dest, wp,0x0,1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tbf->tfi(),5);// TFI |
| |
| bitvec_write_field(dest, wp,0x0,1); // |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting Time = off |
| if (alpha || gamma) { |
| bitvec_write_field(dest, wp,0x1,1); // Timeslot Allocation with Power Control |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // Timeslot Allocation |
| |
| for (ts = 0; ts < 8; ts++) { |
| if (tbf->pdch[ts]) { |
| bitvec_write_field(dest, wp,0x1,1); // USF_TN(i): on |
| bitvec_write_field(dest, wp,tbf->m_usf[ts],3); // USF_TN(i) |
| if (alpha || gamma) |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // USF_TN(i): off |
| } |
| // bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present |
| } |
| |
| |
| /* generate downlink assignment */ |
| void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block, |
| uint8_t old_tfi, uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, |
| uint8_t poll, uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts, |
| bool use_egprs) |
| { |
| // Packet downlink assignment TS 44.060 11.2.7 |
| |
| PDA_AdditionsR99_t *pda_r99; |
| |
| uint8_t tn; |
| |
| block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| block->RRBP = 0x0; // N+13 |
| block->SP = poll; // RRBP field is valid |
| block->USF = 0x0; // Uplink state flag |
| |
| block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment |
| block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging |
| |
| block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off |
| |
| block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI |
| |
| block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation |
| block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode |
| block->u.Packet_Downlink_Assignment.CONTROL_ACK = tbf->was_releasing; // NW establishes no new DL TBF for the MS with running timer T3192 |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s) |
| for (tn = 0; tn < 8; tn++) { |
| if (tbf->pdch[tn]) |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s) |
| } |
| |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta(); // TIMING_ADVANCE_VALUE |
| if (ta_idx < 0) { |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off |
| } else { |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x1; // TIMING_ADVANCE_INDEX = on |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_INDEX = ta_idx; // TIMING_ADVANCE_INDEX |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_TIMESLOT_NUMBER = ta_ts; // TIMING_ADVANCE_TS |
| } |
| |
| block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off |
| |
| block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tbf->tsc(); // Training Sequence Code (TSC) |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = tbf->trx->arfcn; // ARFCN |
| |
| block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on |
| block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tbf->tfi(); // TFI |
| |
| block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = alpha; // ALPHA |
| |
| for (tn = 0; tn < 8; tn++) |
| { |
| if (tbf->pdch[tn]) |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = gamma; // GAMMA_TN |
| } |
| else |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off |
| } |
| } |
| |
| block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off |
| block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off |
| if (!use_egprs) { |
| block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| return; |
| } |
| block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x1; // AdditionsR99 = on |
| pda_r99 = &block->u.Packet_Downlink_Assignment.AdditionsR99; |
| pda_r99->Exist_EGPRS_Params = 1; |
| pda_r99->EGPRS_WindowSize = 0; /* 64, see TS 44.060, table 12.5.2.1 */ |
| pda_r99->LINK_QUALITY_MEASUREMENT_MODE = 0x0; /* no meas, see TS 44.060, table 11.2.7.2 */ |
| pda_r99->Exist_BEP_PERIOD2 = 0; /* No extra EGPRS BEP PERIOD */ |
| pda_r99->Exist_Packet_Extended_Timing_Advance = 0; |
| pda_r99->Exist_COMPACT_ReducedMA = 0; |
| } |
| |
| /* generate paging request */ |
| int Encoding::write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len) |
| { |
| unsigned wp = 0; |
| int plen; |
| |
| bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| bitvec_write_field(dest, wp,0x21,8); // Paging Request Message Type |
| |
| bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| bitvec_write_field(dest, wp,0x0,4); // Channel Needed |
| |
| // Mobile Identity |
| bitvec_write_field(dest, wp,ptmsi_len+1,8); // Mobile Identity length |
| bitvec_write_field(dest, wp,0xf,4); // unused |
| bitvec_write_field(dest, wp,0x4,4); // PTMSI type |
| for (int i = 0; i < ptmsi_len; i++) |
| { |
| bitvec_write_field(dest, wp,ptmsi[i],8); // PTMSI |
| } |
| if ((wp % 8)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Length of PAG.REQ without rest " |
| "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| exit (0); |
| } |
| plen = wp / 8; |
| bitvec_write_field(dest, wp,0x0,1); // "L" NLN(PCH) = off |
| bitvec_write_field(dest, wp,0x0,1); // "L" Priority1 = off |
| bitvec_write_field(dest, wp,0x1,1); // "L" Priority2 = off |
| bitvec_write_field(dest, wp,0x0,1); // "L" Group Call information = off |
| bitvec_write_field(dest, wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure |
| bitvec_write_field(dest, wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure |
| |
| return plen; |
| } |
| |
| /** |
| * The index of the array show_rbb is the bit position inside the rbb |
| * (show_rbb[63] relates to BSN ssn-1) |
| */ |
| void Encoding::encode_rbb(const char *show_rbb, uint8_t *rbb) |
| { |
| uint8_t rbb_byte = 0; |
| |
| // RECEIVE_BLOCK_BITMAP |
| for (int i = 0; i < 64; i++) { |
| /* Set bit at the appropriate position (see 3GPP TS 04.60 9.1.8.1) */ |
| if (show_rbb[i] == 'R') |
| rbb_byte |= 1<< (7-(i%8)); |
| |
| if((i%8) == 7) { |
| rbb[i/8] = rbb_byte; |
| rbb_byte = 0; |
| } |
| } |
| } |
| |
| static void write_packet_ack_nack_desc_gprs( |
| struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| gprs_rlc_ul_window *window, bool is_final) |
| { |
| char rbb[65]; |
| |
| window->update_rbb(rbb); |
| |
| rbb[64] = 0; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received " |
| "I=Invalid\n", rbb); |
| |
| bitvec_write_field(dest, wp, is_final, 1); // FINAL_ACK_INDICATION |
| bitvec_write_field(dest, wp, window->ssn(), 7); // STARTING_SEQUENCE_NUMBER |
| |
| for (int i = 0; i < 64; i++) { |
| /* Set bit at the appropriate position (see 3GPP TS 04.60 9.1.8.1) */ |
| bool is_ack = (rbb[i] == 'R'); |
| bitvec_write_field(dest, wp, is_ack, 1); |
| } |
| } |
| |
| static void write_packet_uplink_ack_gprs( |
| struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| { |
| |
| bitvec_write_field(dest, wp, tbf->current_cs().to_num() - 1, 2); // CHANNEL_CODING_COMMAND |
| write_packet_ack_nack_desc_gprs(bts, dest, wp, &tbf->m_window, is_final); |
| |
| bitvec_write_field(dest, wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| bitvec_write_field(dest, wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Timing Advance |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Power Control Parameters |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Extension Bits |
| bitvec_write_field(dest, wp, 0, 1); // fixed 0 |
| bitvec_write_field(dest, wp, 1, 1); // 1: have Additions R99 |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| bitvec_write_field(dest, wp, 1, 1); // TBF_EST (enabled) |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have REL 5 |
| }; |
| |
| static void write_packet_ack_nack_desc_egprs( |
| struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| gprs_rlc_ul_window *window, bool is_final) |
| { |
| int urbb_len = 0; |
| int crbb_len = 0; |
| int len; |
| bool bow = true; |
| bool eow = true; |
| int ssn = window->mod_sns(window->v_q() + 1); |
| int num_blocks = window->mod_sns(window->v_r() - window->v_q()); |
| int esn_crbb = window->mod_sns(ssn - 1); |
| int rest_bits = dest->data_len * 8 - wp; |
| |
| if (num_blocks > 0) |
| /* V(Q) is NACK and omitted -> SSN = V(Q) + 1 */ |
| num_blocks -= 1; |
| |
| if (num_blocks > window->ws()) |
| num_blocks = window->ws(); |
| |
| if (num_blocks > rest_bits) { |
| eow = false; |
| urbb_len = rest_bits; |
| /* TODO: use compression, start encoding bits and stop when the |
| * space is exhausted. Use the first combination that encodes |
| * all bits. If there is none, use the combination that encodes |
| * the largest number of bits (e.g. by setting num_blocks to the |
| * max and repeating the construction). |
| */ |
| } else if (num_blocks > rest_bits - 9) { |
| /* union bit and length field take 9 bits */ |
| eow = false; |
| urbb_len = rest_bits - 9; |
| /* TODO: use compression (see above) */ |
| } |
| |
| if (urbb_len + crbb_len == rest_bits) |
| len = -1; |
| else if (crbb_len == 0) |
| len = urbb_len + 15; |
| else |
| len = urbb_len + crbb_len + 23; |
| |
| /* EGPRS Ack/Nack Description IE */ |
| if (len < 0) { |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have length |
| } else { |
| bitvec_write_field(dest, wp, 1, 1); // 1: have length |
| bitvec_write_field(dest, wp, len, 8); // length |
| } |
| |
| bitvec_write_field(dest, wp, is_final, 1); // FINAL_ACK_INDICATION |
| bitvec_write_field(dest, wp, bow, 1); // BEGINNING_OF_WINDOW |
| bitvec_write_field(dest, wp, eow, 1); // END_OF_WINDOW |
| bitvec_write_field(dest, wp, ssn, 11); // STARTING_SEQUENCE_NUMBER |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have CRBB |
| |
| /* TODO: Add CRBB support */ |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, |
| " - EGPRS URBB, len = %d, SSN = %d, ESN_CRBB = %d, " |
| "SNS = %d, WS = %d, V(Q) = %d, V(R) = %d%s%s\n", |
| urbb_len, ssn, esn_crbb, |
| window->sns(), window->ws(), window->v_q(), window->v_r(), |
| bow ? ", BOW" : "", eow ? ", EOW" : ""); |
| for (int i = urbb_len; i > 0; i--) { |
| /* Set bit at the appropriate position (see 3GPP TS 04.60 12.3.1) */ |
| bool is_ack = window->m_v_n.is_received(esn_crbb + i); |
| bitvec_write_field(dest, wp, is_ack, 1); |
| } |
| } |
| |
| static void write_packet_uplink_ack_egprs( |
| struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| { |
| bitvec_write_field(dest, wp, 0, 2); // fixed 00 |
| bitvec_write_field(dest, wp, 2, 4); // CHANNEL_CODING_COMMAND: MCS-3 |
| // bitvec_write_field(dest, wp, tbf->current_cs() - 1, 4); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp, 0, 1); // 0: no RESEGMENT (nyi) |
| bitvec_write_field(dest, wp, 1, 1); // PRE_EMPTIVE_TRANSMISSION, TODO: This resembles GPRS, change it? |
| bitvec_write_field(dest, wp, 0, 1); // 0: no PRR_RETRANSMISSION_REQUEST, TODO: clarify |
| bitvec_write_field(dest, wp, 0, 1); // 0: no ARAC_RETRANSMISSION_REQUEST, TODO: clarify |
| bitvec_write_field(dest, wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| bitvec_write_field(dest, wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| bitvec_write_field(dest, wp, 1, 1); // TBF_EST (enabled) |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Timing Advance |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Power Control Parameters |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have Extension Bits |
| |
| write_packet_ack_nack_desc_egprs(bts, dest, wp, &tbf->m_window, is_final); |
| |
| bitvec_write_field(dest, wp, 0, 1); // fixed 0 |
| bitvec_write_field(dest, wp, 0, 1); // 0: don't have REL 5 |
| }; |
| |
| void Encoding::write_packet_uplink_ack( |
| struct gprs_rlcmac_bts *bts, bitvec * dest, |
| struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| { |
| unsigned wp = 0; |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Encoding Ack/Nack for %s " |
| "(final=%d)\n", tbf_name(tbf), is_final); |
| |
| bitvec_write_field(dest, wp, 0x1, 2); // Payload Type |
| bitvec_write_field(dest, wp, 0x0, 2); // Uplink block with TDMA framenumber (N+13) |
| bitvec_write_field(dest, wp, is_final, 1); // Suppl/Polling Bit |
| bitvec_write_field(dest, wp, 0x0, 3); // Uplink state flag |
| bitvec_write_field(dest, wp, 0x9, 6); // MESSAGE TYPE Uplink Ack/Nack |
| bitvec_write_field(dest, wp, 0x0, 2); // Page Mode |
| |
| bitvec_write_field(dest, wp, 0x0, 2); // fixed 00 |
| bitvec_write_field(dest, wp, tbf->tfi(), 5); // Uplink TFI |
| |
| if (tbf->is_egprs_enabled()) { |
| /* PU_AckNack_EGPRS = on */ |
| bitvec_write_field(dest, wp, 1, 1); // 1: EGPRS |
| write_packet_uplink_ack_egprs(bts, dest, wp, tbf, is_final); |
| } else { |
| /* PU_AckNack_GPRS = on */ |
| bitvec_write_field(dest, wp, 0, 1); // 0: GPRS |
| write_packet_uplink_ack_gprs(bts, dest, wp, tbf, is_final); |
| } |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, |
| "Uplink Ack/Nack bit count %d, max %d, message = %s\n", |
| wp, dest->data_len * 8, |
| osmo_hexdump(dest->data, dest->data_len)); |
| } |
| |
| unsigned Encoding::write_packet_paging_request(bitvec * dest) |
| { |
| unsigned wp = 0; |
| |
| bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| bitvec_write_field(dest, wp,0x0,3); // No polling |
| bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| bitvec_write_field(dest, wp,0x22,6); // MESSAGE TYPE |
| |
| bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| |
| bitvec_write_field(dest, wp,0x0,1); // No PERSISTENCE_LEVEL |
| bitvec_write_field(dest, wp,0x0,1); // No NLN |
| |
| return wp; |
| } |
| |
| unsigned Encoding::write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len, |
| uint8_t *identity, uint8_t chan_needed) |
| { |
| bitvec_write_field(dest, wp,0x1,1); // Repeated Page info exists |
| |
| bitvec_write_field(dest, wp,0x1,1); // RR connection paging |
| |
| if ((identity[0] & 0x07) == 4) { |
| bitvec_write_field(dest, wp,0x0,1); // TMSI |
| identity++; |
| len--; |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // MI |
| bitvec_write_field(dest, wp,len,4); // MI len |
| } |
| while (len) { |
| bitvec_write_field(dest, wp,*identity++,8); // MI data |
| len--; |
| } |
| bitvec_write_field(dest, wp,chan_needed,2); // CHANNEL_NEEDED |
| bitvec_write_field(dest, wp,0x0,1); // No eMLPP_PRIORITY |
| |
| return wp; |
| } |
| |
| int Encoding::rlc_write_dl_data_header(const struct gprs_rlc_data_info *rlc, |
| uint8_t *data) |
| { |
| struct gprs_rlc_dl_header_egprs_3 *egprs3; |
| struct rlc_dl_header *gprs; |
| unsigned int e_fbi_header; |
| GprsCodingScheme cs = rlc->cs; |
| |
| switch(cs.headerTypeData()) { |
| case GprsCodingScheme::HEADER_GPRS_DATA: |
| gprs = static_cast<struct rlc_dl_header *> |
| ((void *)data); |
| |
| gprs->usf = rlc->usf; |
| gprs->s_p = rlc->es_p != 0 ? 1 : 0; |
| gprs->rrbp = rlc->rrbp; |
| gprs->pt = 0; |
| gprs->tfi = rlc->tfi; |
| gprs->pr = rlc->pr; |
| |
| gprs->fbi = rlc->block_info[0].cv == 0; |
| gprs->e = rlc->block_info[0].e; |
| gprs->bsn = rlc->block_info[0].bsn; |
| break; |
| |
| case GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3: |
| egprs3 = static_cast<struct gprs_rlc_dl_header_egprs_3 *> |
| ((void *)data); |
| |
| egprs3->usf = rlc->usf; |
| egprs3->es_p = rlc->es_p; |
| egprs3->rrbp = rlc->rrbp; |
| egprs3->tfi_a = rlc->tfi >> 0; /* 1 bit LSB */ |
| egprs3->tfi_b = rlc->tfi >> 1; /* 4 bits */ |
| egprs3->pr = rlc->pr; |
| egprs3->cps = rlc->cps; |
| |
| egprs3->bsn1_a = rlc->block_info[0].bsn >> 0; /* 2 bits LSB */ |
| egprs3->bsn1_b = rlc->block_info[0].bsn >> 2; /* 8 bits */ |
| egprs3->bsn1_c = rlc->block_info[0].bsn >> 10; /* 1 bit */ |
| |
| egprs3->spb = rlc->block_info[0].spb; |
| |
| e_fbi_header = rlc->block_info[0].e ? 0x01 : 0; |
| e_fbi_header |= rlc->block_info[0].cv == 0 ? 0x02 : 0; /* FBI */ |
| e_fbi_header <<= 7; |
| data[3] = (data[3] & 0b01111111) | (e_fbi_header >> 0); |
| data[4] = (data[4] & 0b11111110) | (e_fbi_header >> 8); |
| break; |
| |
| case GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1: |
| case GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2: |
| /* TODO: Support both header types */ |
| /* fall through */ |
| default: |
| LOGP(DRLCMACDL, LOGL_ERROR, |
| "Encoding of uplink %s data blocks not yet supported.\n", |
| cs.name()); |
| return -ENOTSUP; |
| }; |
| |
| return 0; |
| } |
| |
| /** |
| * \brief Copy LSB bitstream RLC data block from byte aligned buffer. |
| * |
| * Note that the bitstream is encoded in LSB first order, so the two octets |
| * 654321xx xxxxxx87 contain the octet 87654321 starting at bit position 3 |
| * (LSB has bit position 1). This is a different order than the one used by |
| * CSN.1. |
| * |
| * \param data_block_idx The block index, 0..1 for header type 1, 0 otherwise |
| * \param src A pointer to the start of the RLC block (incl. the header) |
| * \param buffer A data area of a least the size of the RLC block |
| * \returns the number of bytes copied |
| */ |
| unsigned int Encoding::rlc_copy_from_aligned_buffer( |
| const struct gprs_rlc_data_info *rlc, |
| unsigned int data_block_idx, |
| uint8_t *dst, const uint8_t *buffer) |
| { |
| unsigned int hdr_bytes; |
| unsigned int extra_bits; |
| unsigned int i; |
| |
| uint8_t c, last_c; |
| const uint8_t *src; |
| const struct gprs_rlc_data_block_info *rdbi; |
| |
| OSMO_ASSERT(data_block_idx < rlc->num_data_blocks); |
| rdbi = &rlc->block_info[data_block_idx]; |
| |
| hdr_bytes = rlc->data_offs_bits[data_block_idx] / 8; |
| extra_bits = (rlc->data_offs_bits[data_block_idx] % 8); |
| |
| if (extra_bits == 0) { |
| /* It is aligned already */ |
| memmove(dst + hdr_bytes, buffer, rdbi->data_len); |
| return rdbi->data_len; |
| } |
| |
| src = buffer; |
| dst = dst + hdr_bytes; |
| last_c = *dst << (8 - extra_bits); |
| |
| for (i = 0; i < rdbi->data_len; i++) { |
| c = src[i]; |
| *(dst++) = (last_c >> (8 - extra_bits)) | (c << extra_bits); |
| last_c = c; |
| } |
| |
| /* overwrite the lower extra_bits */ |
| *dst = (*dst & (0xff << extra_bits)) | (last_c >> (8 - extra_bits)); |
| |
| return rdbi->data_len; |
| } |
| |
| static Encoding::AppendResult rlc_data_to_dl_append_gprs( |
| struct gprs_rlc_data_block_info *rdbi, |
| gprs_llc *llc, int *offset, int *num_chunks, |
| uint8_t *data_block, |
| bool is_final) |
| { |
| int chunk; |
| int space; |
| struct rlc_li_field *li; |
| uint8_t *delimiter, *data, *e_pointer; |
| |
| data = data_block + *offset; |
| delimiter = data_block + *num_chunks; |
| e_pointer = (*num_chunks ? delimiter - 1 : NULL); |
| |
| chunk = llc->chunk_size(); |
| space = rdbi->data_len - *offset; |
| |
| /* if chunk will exceed block limit */ |
| if (chunk > space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "larger than space (%d) left in block: copy " |
| "only remaining space, and we are done\n", |
| chunk, space); |
| /* block is filled, so there is no extension */ |
| if (e_pointer) |
| *e_pointer |= 0x01; |
| /* fill only space */ |
| llc->consume(data, space); |
| /* return data block as message */ |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| return Encoding::AR_NEED_MORE_BLOCKS; |
| } |
| /* if FINAL chunk would fit precisely in space left */ |
| if (chunk == space && is_final) |
| { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): because " |
| "this is a final block, we don't add length " |
| "header, and we are done\n", chunk, space); |
| /* block is filled, so there is no extension */ |
| if (e_pointer) |
| *e_pointer |= 0x01; |
| /* fill space */ |
| llc->consume(data, space); |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| rdbi->cv = 0; |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| /* if chunk would fit exactly in space left */ |
| if (chunk == space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): add length " |
| "header with LI=0, to make frame extend to " |
| "next block, and we are done\n", chunk, space); |
| /* make space for delimiter */ |
| if (delimiter != data) |
| memmove(delimiter + 1, delimiter, |
| data - delimiter); |
| data++; |
| (*offset)++; |
| space--; |
| /* add LI with 0 length */ |
| li = (struct rlc_li_field *)delimiter; |
| li->e = 1; /* not more extension */ |
| li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| li->li = 0; /* chunk fills the complete space */ |
| rdbi->e = 0; /* 0: extensions present */ |
| // no need to set e_pointer nor increase delimiter |
| /* fill only space, which is 1 octet less than chunk */ |
| llc->consume(data, space); |
| /* return data block as message */ |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| return Encoding::AR_NEED_MORE_BLOCKS; |
| } |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| "than remaining space (%d): add length header to " |
| "to delimit LLC frame\n", chunk, space); |
| /* the LLC frame chunk ends in this block */ |
| /* make space for delimiter */ |
| if (delimiter != data) |
| memmove(delimiter + 1, delimiter, data - delimiter); |
| data++; |
| (*offset)++; |
| space--; |
| /* add LI to delimit frame */ |
| li = (struct rlc_li_field *)delimiter; |
| li->e = 0; /* Extension bit, maybe set later */ |
| li->m = 0; /* will be set later, if there is more LLC data */ |
| li->li = chunk; /* length of chunk */ |
| rdbi->e = 0; /* 0: extensions present */ |
| (*num_chunks)++; |
| /* copy (rest of) LLC frame to space and reset later */ |
| llc->consume(data, chunk); |
| data += chunk; |
| space -= chunk; |
| (*offset) += chunk; |
| /* if we have more data and we have space left */ |
| if (space > 0 && !is_final) { |
| li->m = 1; /* we indicate more frames to follow */ |
| return Encoding::AR_COMPLETED_SPACE_LEFT; |
| } |
| /* if we don't have more LLC frames */ |
| if (is_final) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| "done.\n"); |
| li->e = 1; /* we cannot extend */ |
| rdbi->cv = 0; |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| /* we have no space left */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| "done.\n"); |
| li->e = 1; /* we cannot extend */ |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| |
| static Encoding::AppendResult rlc_data_to_dl_append_egprs( |
| struct gprs_rlc_data_block_info *rdbi, |
| gprs_llc *llc, int *offset, int *num_chunks, |
| uint8_t *data_block, |
| bool is_final) |
| { |
| int chunk; |
| int space; |
| struct rlc_li_field_egprs *li; |
| struct rlc_li_field_egprs *prev_li; |
| uint8_t *delimiter, *data; |
| |
| data = data_block + *offset; |
| delimiter = data_block + *num_chunks; |
| prev_li = (struct rlc_li_field_egprs *) |
| (*num_chunks ? delimiter - 1 : NULL); |
| |
| chunk = llc->chunk_size(); |
| space = rdbi->data_len - *offset; |
| |
| /* if chunk will exceed block limit */ |
| if (chunk > space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "larger than space (%d) left in block: copy " |
| "only remaining space, and we are done\n", |
| chunk, space); |
| /* fill only space */ |
| llc->consume(data, space); |
| /* return data block as message */ |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| return Encoding::AR_NEED_MORE_BLOCKS; |
| } |
| /* if FINAL chunk would fit precisely in space left */ |
| if (chunk == space && is_final) |
| { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): because " |
| "this is a final block, we don't add length " |
| "header, and we are done\n", chunk, space); |
| /* fill space */ |
| llc->consume(data, space); |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| rdbi->cv = 0; |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| /* if chunk would fit exactly in space left */ |
| if (chunk == space) { |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| "would exactly fit into space (%d): just copy " |
| "it, and we are done. The next block will have " |
| "to start with an empty chunk\n", |
| chunk, space); |
| /* fill space */ |
| llc->consume(data, space); |
| *offset = rdbi->data_len; |
| (*num_chunks)++; |
| return Encoding::AR_NEED_MORE_BLOCKS; |
| } |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| "than remaining space (%d): add length header to " |
| "to delimit LLC frame\n", chunk, space); |
| /* the LLC frame chunk ends in this block */ |
| /* make space for delimiter */ |
| |
| if (delimiter != data) |
| memmove(delimiter + 1, delimiter, data - delimiter); |
| |
| data += 1; |
| (*offset) += 1; |
| space -= 1; |
| /* add LI to delimit frame */ |
| li = (struct rlc_li_field_egprs *)delimiter; |
| li->e = 1; /* Extension bit, maybe set later */ |
| li->li = chunk; /* length of chunk */ |
| /* tell previous extension header about the new one */ |
| if (prev_li) |
| prev_li->e = 0; |
| rdbi->e = 0; /* 0: extensions present */ |
| delimiter++; |
| prev_li = li; |
| (*num_chunks)++; |
| /* copy (rest of) LLC frame to space and reset later */ |
| llc->consume(data, chunk); |
| data += chunk; |
| space -= chunk; |
| (*offset) += chunk; |
| /* if we have more data and we have space left */ |
| if (space > 0) { |
| if (!is_final) |
| return Encoding::AR_COMPLETED_SPACE_LEFT; |
| |
| /* we don't have more LLC frames */ |
| /* We will have to add another chunk with filling octets */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, |
| "-- There is remaining space (%d): add filling byte chunk\n", |
| space); |
| |
| if (delimiter != data) |
| memmove(delimiter + 1, delimiter, data - delimiter); |
| |
| data += 1; |
| (*offset) += 1; |
| space -= 1; |
| |
| /* set filling bytes extension */ |
| li = (struct rlc_li_field_egprs *)delimiter; |
| li->e = 1; |
| li->li = 127; |
| |
| /* tell previous extension header about the new one */ |
| if (prev_li) |
| prev_li->e = 0; |
| |
| delimiter++; |
| (*num_chunks)++; |
| |
| rdbi->cv = 0; |
| |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| "are done.\n"); |
| |
| *offset = rdbi->data_len; |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| |
| if (is_final) { |
| /* we don't have more LLC frames */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| "are done.\n"); |
| rdbi->cv = 0; |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| |
| /* we have no space left */ |
| LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| "done.\n"); |
| return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| } |
| |
| Encoding::AppendResult Encoding::rlc_data_to_dl_append( |
| struct gprs_rlc_data_block_info *rdbi, GprsCodingScheme cs, |
| gprs_llc *llc, int *offset, int *num_chunks, |
| uint8_t *data_block, |
| bool is_final) |
| { |
| if (cs.isGprs()) |
| return rlc_data_to_dl_append_gprs(rdbi, |
| llc, offset, num_chunks, data_block, is_final); |
| |
| if (cs.isEgprs()) |
| return rlc_data_to_dl_append_egprs(rdbi, |
| llc, offset, num_chunks, data_block, is_final); |
| |
| LOGP(DRLCMACDL, LOGL_ERROR, "%s data block encoding not implemented\n", |
| cs.name()); |
| |
| return AR_NEED_MORE_BLOCKS; |
| } |