add BCD decoders

dcd/bit.py

@@ -56,3 +56,22 @@ def hex_to_raw(text, separator=" "):
 		output.append(int(text[2*i:2*i+2], 16))
 	
 	return bytearray(output)
+
+def raw_to_bcd(raw):
+	"""
+	Decodes a bytearray (or bytes) to an integer as BCD.
+	"""
+	
+	sum = 0
+	order = 1
+	
+	for byte in reversed(raw):
+		sum += (byte & 0x0f) * order
+		order *= 10
+		sum += (byte >> 4) * order
+		order *= 10
+	
+	return sum
+
+def hex_to_bcd(text):
+	return raw_to_bcd(hex_to_raw(text))