/*******************************************************************************
################################################################################
#   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.                                             #
################################################################################
*******************************************************************************/

/* This file contains all utility functions for MAC CL */

#include "common_def.h"
#include "lwr_mac.h"

 /*******************************************************************
  *
  * @brief Fetch cellCb from Hash list
  *
  * @details
  *
  *    Function : rgClUtlGetCellCb
  *
  *    Functionality:
  *       - Searches for a cell entry at MAC CL 
  *
  * @params[in] cell Id
  * @return Pointer to cellCb - success
  *         NULLP - failure
  *
  * ****************************************************************/
LwrMacCellCb * lwrMacGetCellCb
(
   uint16_t cellId
)
{
   LwrMacCellCb *cellCb;

   if(cellId >= MAX_NUM_CELL)
   {
      DU_LOG("\nERROR  -->  Invalid Cell Id [%d]. rgClUtlGetCellCb failed.", cellId);
      return NULLP;
   }
   
   cellCb = &lwrMacCb.cellCb[cellId -1];

   return cellCb;
}

/*******************************************************************
 *
 * @brief Reverses bits in a number
 *
 * @details
 *
 *    Function : reverseBits
 *
 *    Functionality:
 *      Reverses bits in a number
 *
 * @params[in] Number to be reversed
 *             Number of bits to be reversed
 * @return Reversed number
 *
 * ****************************************************************/
uint32_t reverseBits(uint32_t num, uint8_t numBits)
{
   uint32_t reverse_num = 0;
   uint8_t bitIdx;
   for (bitIdx = 0; bitIdx < numBits; bitIdx++)
   {
      if((num & (1 << bitIdx)))
	 reverse_num |= 1 << ((numBits - 1) - bitIdx);
   }
   return reverse_num;
}

/*******************************************************************
 *
 * @brief Fills DL DCI payload byte by byte
 *
 * @details
 *
 *    Function : fillDlDciPayload
 *
 *    Functionality:
 *      Fills DL DCI payload byte by byte
 *
 * @params[in] Payload buffer pointer
 *             Current Byte position in buffer
 *             Current Bit Position in current byte
 *             Value to be filled
 *             Number of bits in value
 * @return void
 *
 * ****************************************************************/

void fillDlDciPayload(uint8_t *buf, uint8_t *bytePos, uint8_t *bitPos,\
      uint32_t val, uint8_t valSize)
{
   uint8_t temp;
   uint8_t bytePart1;
   uint32_t bytePart2;
   uint8_t bytePart1Size;
   uint8_t bytePart2Size;

   if(*bitPos + valSize <= 8)
   {
      bytePart1 = (uint8_t)val;
      bytePart1 = (~((~0) << valSize)) & bytePart1;
      buf[*bytePos] |= bytePart1;
      *bitPos += valSize;
   }
   else if(*bitPos + valSize > 8)
   {
      temp = (uint8_t)val;
      bytePart1Size = 8 - *bitPos;
      bytePart2Size = valSize - bytePart1Size;

      bytePart1 = ((~((~0) << bytePart1Size)) & temp) << *bitPos;
      bytePart2 = val >> bytePart1Size;

      buf[*bytePos] |= bytePart1;
      (*bytePos)--;
      *bitPos = 0;
      fillDlDciPayload(buf, bytePos, bitPos, bytePart2, bytePart2Size);
   }
}



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