Python Script to check SVF files integrity

sfv-verifier

#!/usr/bin/env python
##this script was written by [email protected] , feel free to modify it but mention the author, thank you 
import zlib,sys,os.path
##this function calculates CRC of a fileName
file_to_check=sys.argv[1]
file_path=os.path.dirname(file_to_check)
def crc(fileName):
 prev=0
 global file_path
 ##for the script to work on any sfv file no matter where it's located , we have to parse the absolute path of each file within sfv
 ##so, we will add the file path to each file name , pretty neat huh ?
 fileName=os.path.join(file_path,fileName)
 
 #print fileName
 if os.path.exists(fileName):
  store=open(fileName, "rb")
  for eachLine in store:
   prev = zlib.crc32(eachLine, prev)
  return "%x"%(prev & 0xFFFFFFFF)
  store.close()	
 else:
  print"crc of this file can't be verified since it doesn't exists "
##=============##

if os.path.exists(file_to_check)==True:
 if file_to_check[-3:]=="sfv":
  s=open(file_to_check)
  names_list=[]
  sfv_list=[]
   ##loop thru all lines of sfv, removes all unnecessary /r /n chars, split each line to two values,creates two distinct arrays 
  for line in s.readlines():
   m=line.rstrip('\r\n')
   m=m.split(' ')
   names_list.append(m[0])
   sfv_list.append(m[1])
  #print line
  i=0
  no_errors=False
  while(len(names_list)>i): 
   print names_list[i]
   calc_sfv_value=crc(names_list[i])
   print calc_sfv_value
   print sfv_list[i]
   #sfv_match= re.sub("^0+","",sfv_list[i])
   if sfv_list[i].lstrip('0')==calc_sfv_value:
    print "MATCH";
    no_errors=True
   else:
    print "this was a problem with file"
    no_errors=False
   i=i+1
  if (no_errors):
		 print "Great, sfv verification went well without any errors,you can extract files safely"
 else:
  print " not SFV file"
else:
  print "this file doesn't exist"