client/pyscripts/parity.py

   1 # This code is contributed by
   2 # Shubham Singh(SHUBHAMSINGH10)
   3 # 2020, modified (@iceman1001)
   4
   5 import sys
   6
   7 # Python3 program to illustrate Compute the
   8 # parity of a number using XOR
   9 # Generating the look-up table while pre-processing
  10 def P2(n, table):
  11     table.extend([n, n ^ 1, n ^ 1, n])
  12 def P4(n, table):
  13     return (P2(n, table), P2(n ^ 1, table),
  14             P2(n ^ 1, table), P2(n, table))
  15 def P6(n, table):
  16     return (P4(n, table), P4(n ^ 1, table),
  17             P4(n ^ 1, table), P4(n, table))
  18 def LOOK_UP(table):
  19     return (P6(0, table), P6(1, table),
  20             P6(1, table), P6(0, table))
  21
  22 # LOOK_UP is the macro expansion to generate the table
  23 table = [0] * 256
  24 LOOK_UP(table)
  25
  26 # Function to find the parity
  27 def Parity(num) :
  28     # Number is considered to be of 32 bits
  29     max = 16
  30
  31     # Dividing the number o 8-bit
  32     # chunks while performing X-OR
  33     while (max >= 8):
  34         num = num ^ (num >> max)
  35         max = max // 2
  36
  37     # Masking the number with 0xff (11111111)
  38     # to produce valid 8-bit result
  39     return table[num & 0xff]
  40
  41 def main():
  42     if(len(sys.argv) < 2):
  43         print("""
  44     \t{0} - Calculate parity of a given number
  45
  46     Usage: {0} <2,10,16> <number>
  47
  48     \t Specify type as in 2 Bin, 10 Decimal, 16 Hex, and  number in that particular format
  49     \t number can only be 32bit long.
  50
  51     Example:
  52
  53     \t{0} 10 1234
  54
  55     Should produce the output:
  56
  57     \tOdd parity\n""".format(sys.argv[0]))
  58         return 0
  59
  60
  61     numtype=  int(sys.argv[1], 10)
  62     print("numtype: {0}".format(numtype))
  63     input= int(sys.argv[2], numtype)
  64     print("num: {0} 0x{0:X}".format(input))
  65
  66     #num = "001111100010100011101010111101011110"
  67     # Result is 1 for odd parity
  68     # 0 for even parity
  69 #    result = Parity( int(input, numtype) )
  70     result = Parity(input)
  71     print("Odd parity") if result else print("Even parity")
  72
  73
  74 if __name__ == "__main__":
  75     main()
  76
  77
  78