common: rephrase bitpack(), use list comprehension Python idiom

[libsigrokdecode.git] / decoders / common / srdhelper / mod.py

##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2012-2014 Uwe Hermann <uwe@hermann-uwe.de>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
##

# Return the specified BCD number (max. 8 bits) as integer.
def bcd2int(b):
    return (b & 0x0f) + ((b >> 4) * 10)

def bin2int(s: str):
    return int('0b' + s, 2)

def bitpack(bits):
    return sum([b << i for i, b in enumerate(bits)])

def bitunpack(num, minbits=0):
    res = []
    while num or minbits > 0:
        res.append(num & 1)
        num >>= 1
        minbits -= 1
    return tuple(res)