/*******************************************************************************
################################################################################
#   Copyright (c) [2017-2019] [Radisys]                                        #
#                                                                              #
#   Licensed under the Apache License, Version 2.0 (the "License");            #
#   you may not use this file except in compliance with the License.           #
#   You may obtain a copy of the License at                                    #
#                                                                              #
#       http://www.apache.org/licenses/LICENSE-2.0                             #
#                                                                              #
#   Unless required by applicable law or agreed to in writing, software        #
#   distributed under the License is distributed on an "AS IS" BASIS,          #
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
#   See the License for the specific language governing permissions and        #
#   limitations under the License.                                             #
################################################################################
 *******************************************************************************/

#include <stdlib.h>
#include <stdint.h>

/* header include files -- defines (.h) */
#include "envopt.h"        /* environment options */
#include "envdep.h"        /* environment dependent */
#include "envind.h"        /* environment independent */
#include "gen.h"           /* general layer */
#include "ssi.h"           /* system service interface */
#include "cm_hash.h"       /* common hash list */
#include "cm_mblk.h"       /* common memory link list library */
#include "cm_llist.h"      /* common linked list library */
#include "cm_err.h"        /* common error */
#include "cm_lte.h"        /* common LTE */
#include "lrg.h"           /* Layer manager interface includes*/
#include "crg.h"           /* CRG interface includes*/
#include "rgu.h"           /* RGU interface includes*/
#include "tfu.h"           /* TFU interface includes */
#include "rg_sch_inf.h"    /* SCH interface includes */
#include "rg_prg.h"       /* PRG (MAC-MAC) interface includes*/
#include "rg_env.h"       /* MAC environmental includes*/
#include "rg.h"           /* MAC includes*/
#include "rg_err.h"       /* MAC error includes*/
#include "du_log.h"

/* header/extern include files (.x) */
#include "gen.x"           /* general layer typedefs */
#include "ssi.x"           /* system services typedefs */
#include "cm5.x"           /* common timers */
#include "cm_hash.x"       /* common hash list */
#include "cm_lib.x"        /* common library */
#include "cm_llist.x"      /* common linked list */
#include "cm_mblk.x"       /* memory management */
#include "cm_tkns.x"       /* common tokens */
#include "cm_lte.x"       /* common tokens */
#include "rgu.x"           /* RGU types */
#include "tfu.x"           /* RGU types */
#include "lrg.x"           /* layer management typedefs for MAC */
#include "crg.x"           /* CRG interface includes */
#include "rg_sch_inf.x"    /* SCH interface typedefs */
#include "rg_prg.x"        /* PRG (MAC-MAC) Interface typedefs */
#include "du_app_mac_inf.h"
#include "mac.h"
#include "rg.x"            /* typedefs for MAC */

void packBytes(uint8_t *buf, uint8_t *bytePos, uint8_t *bitPos, uint32_t val, uint8_t valSize)
{
   uint32_t  temp;
   uint8_t   bytePart1;
   uint32_t  bytePart2;
   uint8_t   bytePart1Size;
   uint32_t  bytePart2Size;
  
   if(*bitPos - valSize + 1 >= 0)
   {
      bytePart1 = (uint8_t)val;
      bytePart1 = (bytePart1 << (*bitPos -valSize +1));
      buf[*bytePos] |= bytePart1;
      if(*bitPos - valSize < 0)
      {
         *bitPos = 7;
         (*bytePos)++;
      }
      else
         *bitPos -= valSize;
   }
   else
   {
      temp = 0;
      bytePart1Size = *bitPos +1;
      bytePart2Size = valSize - bytePart1Size;

      bytePart1 = (val >> bytePart2Size) << (*bitPos -bytePart1Size +1);
      bytePart2 =  (~((~temp) << bytePart2Size)) & val;
 
      buf[*bytePos] |= bytePart1;
      (*bytePos)++;
      *bitPos = 7;
      packBytes(buf, bytePos, bitPos, bytePart2, bytePart2Size);
   }  
}

void fillRarPdu(RarInfo *rarInfo)
{
   uint8_t   *rarPdu = rarInfo->rarPdu;
   uint16_t  totalBits;
   uint8_t   numBytes;
   uint8_t   bytePos;
   uint8_t   bitPos;

   /* RAR subheader fields */
   uint8_t   EBit;
   uint8_t   TBit;
   uint8_t   rapId;

   /* RAR payload fields */
   uint8_t   RBit;
   uint16_t  timeAdv;
   uint32_t  ulGrant;
   uint16_t  tmpCrnti; 

   /* Size(in bits) of RAR subheader files */
   uint8_t   EBitSize = 1;
   uint8_t   TBitSize = 1;
   uint8_t   rapidSize = 6;

   /* Size(in bits) of RAR payload fields */
   uint8_t   RBitSize = 1;
   uint8_t   timeAdvSize = 12;
   uint8_t   ulGrantSize = 27;
   uint8_t   tmpCrntiSize = 16;

   /* Fill RAR pdu fields */
   EBit = 0;
   TBit = 1;
   rapId = rarInfo->RAPID;
   
   RBit = 0;
   timeAdv = rarInfo->ta;
   ulGrant = 0; /* this will be done when implementing msg3 */ 
   tmpCrnti = rarInfo->tcrnti;

   /* Calulating total number of bytes in buffer */
   totalBits = EBitSize + TBitSize + rapidSize + RBitSize + timeAdvSize \
     + ulGrantSize + tmpCrntiSize;
   
   /* Calulating total number of bytes in buffer */
   numBytes = totalBits/8;
   if(totalBits % 8)
      numBytes += 1;
    
	rarInfo->rarPduLen = numBytes;

   /* Initialize buffer */
   for(bytePos = 0; bytePos < numBytes; bytePos++)
      rarPdu[bytePos] = 0;
   
   bytePos = 0;
   bitPos = 7;

   /* Packing fields into RAR PDU */
   packBytes(rarPdu, &bytePos, &bitPos, EBit, EBitSize); 
   packBytes(rarPdu, &bytePos, &bitPos, TBit, TBitSize);
   packBytes(rarPdu, &bytePos, &bitPos, rapId, rapidSize);
   packBytes(rarPdu, &bytePos, &bitPos, RBit, RBitSize);
   packBytes(rarPdu, &bytePos, &bitPos, timeAdv, timeAdvSize);
   packBytes(rarPdu, &bytePos, &bitPos, ulGrant, ulGrantSize);
   packBytes(rarPdu, &bytePos, &bitPos, tmpCrnti, tmpCrntiSize);
}

/**********************************************************************
  End of file
 **********************************************************************/