#! /usr/bin/env python3
# encoding: utf-8

# ----------------------------------------------------------------

class Bitfield:
	def __init__(self):
		self.value = 0
		self.length = 0
	
	def shift_in(self, value, length):
		self.value <<= length
		self.value |= value
		self.length += length
		
	def dump(self, align=True):
		value = self.value
		length = self.length
		
		pad = (8 - (length % 8)) % 8
		value <<= pad
		length += pad
		
		Bs = []
		
		for i in range(length // 8):
			Bs.insert(0, value & 0xff)
			value >>= 8
		
		return bytes(Bs)

# ----------------------------------------------------------------

def raw_to_hex(raw, separator=" "):
	"""
	Converts a bytearray (or bytes) into its textual hexadecimal representation.
	"""
	
	output = []
	
	for o in raw:
		output.append(hex(o)[2:].zfill(2))
	
	return separator.join(output)

def hex_to_raw(text, separator=" "):
	"""
	Converts a hexadecimal representation of a byte array into a bytearray.
	"""
	
	output = []
	
	text = text.replace(separator, "")
	
	for i in range(len(text)//2):
		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))