Big Endian Read and Write

/* This demo program shows how to read */
/* and write big-endian data  */

#include  stdio.h
#include  stdint.h

static inline uint32_t read_32bit_be( const uint8_t * const ptr_buf )
{
  uint32_t  byte0;
  uint32_t  byte1;
  uint32_t  byte2;
  uint32_t  byte3;

  byte0 = ptr_buf[0];
  byte1 = ptr_buf[1];
  byte2 = ptr_buf[2];
  byte3 = ptr_buf[3];

  byte0 <<= 24;
  byte1 <<= 16;
  byte2 <<= 8;

  return  ( byte0 | byte1 | byte2 | byte3 );
}

static inline void  write_32bit_be( uint8_t * ptr_buf, uint32_t value )
{
  ptr_buf[0] = value >> 24;
  ptr_buf[1] = value >> 16;
  ptr_buf[2] = value >> 8;
  ptr_buf[3] = value;
}

int main()
{
  uint8_t buffer[4];
  uint32_t val_32bit;

  val_32bit = UINT32_MAX;

  /*write the 32 bit value to the buffer*/
  write_32bit_be( buffer, val_32bit );

  val_32bit = 0;
  /*Retrieve the big endian value from the buffer*/
  val_32bit = read_32bit_be( buffer );

  printf( "Big-Endian value - %X", val_32bit );

  return 0;
}