fix __init_bits and make it cross-platform (i.e., support Windows)

lib/mbs/framework/Guid.py

@@ -16,13 +16,36 @@ class UUIDParseResult:
 		self.kind = kind
 		self.message = message
 
+class URandom:
+
+	def __init__(self):
+		try:
+			self.__urand = open("/dev/urandom", "rb")
+		except:
+			self.__urand = None
+
+	def read(self, length : int) -> bytes:
+		if self.__urand is not None:
+			return self.__urand.read(length)
+		else:
+			# If /dev/urandom isn't available (eg: in non-unix systems), use mt_rand().
+			# __pr_bits = ""
+			# for cnt in range(0, 16):
+			# 	__pr_bits += chr ( __mt_rand ( 0, 255 ) )
+			pass
+
+		import os
+		return os.urandom(length)
+
+
+
 class Guid:
 
 	__urand = None
 
 	def __init__(self):
 		if Guid.__urand is None:
-			Guid.__urand = open("/dev/urandom", "rb")
+			Guid.__urand = URandom()
 
 		self.__a = 0
 		self.__b = 0
@@ -80,7 +103,7 @@ class Guid:
 		guidBytes = [ myBytes[3], myBytes[2], myBytes[1], myBytes[0], myBytes[5], myBytes[4], myBytes[7], myBytes[6], myBytes[8],
 			    myBytes[9], myBytes[10], myBytes[11], myBytes[12], myBytes[13], myBytes[14], myBytes[15] ]
 		
-		result.parsedGuid = Guid.fromBytes(guidBytes)
+		result.parsedGuid = Guid.from_bytes(guidBytes)
 		return result
 	
 		"""
@@ -228,25 +251,20 @@ class Guid:
 		)
 
 	@staticmethod
-	def __init_bits():
-		__pr_bits = False
-		if Guid.__urand is not None:
-			__pr_bits += Guid.__urand.read(16)
-
-			if not self.__pr_bits:
-				fp = open ( '/dev/urandom', 'rb' )
-				if fp is not False:
-					__pr_bits += fp.read(16)
-					fp.close()
-
-				else:
-
-					# If /dev/urandom isn't available (eg: in non-unix systems), use mt_rand().
-					__pr_bits = ""
-					for cnt in range(0, 16):
-						__pr_bits += chr ( __mt_rand ( 0, 255 ) )
-						
-			return __pr_bits
+	def __init_bits(self):
+		self.pr_bits = Guid.__urand.read(16)
+		
+		self.__a = (int(self.pr_bits[3]) << 24) | (int(self.pr_bits[2]) << 16) | (int(self.pr_bits[1]) << 8) | self.pr_bits[0]
+		self.__b = ((int(self.pr_bits[5]) << 8) | self.pr_bits[4])
+		self.__c = ((int(self.pr_bits[7]) << 8) | self.pr_bits[6])
+		self.__d = self.pr_bits[8]
+		self.__e = self.pr_bits[9]
+		self.__f = self.pr_bits[10]
+		self.__g = self.pr_bits[11]
+		self.__h = self.pr_bits[12]
+		self.__i = self.pr_bits[13]
+		self.__j = self.pr_bits[14]
+		self.__k = self.pr_bits[15]
 
 	"""
 	@brief Generates a Universally Unique IDentifier, version 4.
@@ -261,20 +279,7 @@ class Guid:
 	@staticmethod
 	def generate():
 		uuid = Guid()
-		__pr_bits = Guid.__init_bits()
-		
-		uuid.__a = (int(pr_bits[3]) << 24) | (int(pr_bits[2]) << 16) | (int(pr_bits[1]) << 8) | pr_bits[0]
-		uuid.__b = ((int(pr_bits[5]) << 8) | pr_bits[4])
-		uuid.__c = ((int(pr_bits[7]) << 8) | pr_bits[6])
-		uuid.__d = pr_bits[8]
-		uuid.__e = pr_bits[9]
-		uuid.__f = pr_bits[10]
-		uuid.__g = pr_bits[11]
-		uuid.__h = pr_bits[12]
-		uuid.__i = pr_bits[13]
-		uuid.__j = pr_bits[14]
-		uuid.__k = pr_bits[15]
-
+		uuid.__init_bits()
 		return uuid
 
 	@staticmethod