<gh_stars>0
#!/usr/bin/env python3
""" Module to construct / parse bencoded data """


def parse_blist(bdata):
    """ Convert bencoded data to python list """

    blist = []

    if bdata[0:1] == b"l":
        bdata = bdata[1:]

    while bdata[0:1] != b"" and bdata[0:1] != b"e":
        parse_func = btype_dict.get(bdata[0:1], parse_bstring)
        elem, bdata = parse_func(bdata)

        blist.append(elem)

    return blist, bdata[1:]


def parse_bdict(bdata):
    """ Convert bencoded data to python dict """

    bdict = {}

    if bdata[0:1] == b"d":
        bdata = bdata[1:]

    while bdata[0:1] != b"" and bdata[0:1] != b"e":

        parse_func = btype_dict.get(bdata[0:1], parse_bstring)
        key, bdata = parse_func(bdata)

        if bdata[0:1] == "" or bdata[0:1] == "e":
            value = None
        else:
            parse_func = btype_dict.get(bdata[0:1], parse_bstring)
            value, bdata = parse_func(bdata)

        if key in bdict:
            raise KeyError("Multiple keys in bencoded dictionary")

        bdict[key] = value

    return bdict, bdata[1:]


def parse_bint(bdata):
    """ Convert bencoded data to int """

    end_pos = bdata.index(ord("e"))
    num_str = bdata[1:end_pos]
    bdata = bdata[end_pos + 1 :]

    return int(num_str), bdata


def parse_bstring(bdata):
    """ Convert bencoded data to string """

    delim_pos = bdata.index(ord(":"))
    length = bdata[0:delim_pos]
    length = int(length)

    delim_pos += 1
    bstring = bdata[delim_pos : delim_pos + length]
    bdata = bdata[delim_pos + length :]

    if len(bstring) != length:
        raise ValueError("Incorrect bencoded string length")

    return bstring, bdata


def decode(bdata):
    """ Parse data and return a list of objects """

    return parse_blist(bdata)[0]


btype_dict = {b"d": parse_bdict, b"l": parse_blist, b"i": parse_bint}

#!/usr/bin/env python3
""" Module to construct / parse bencoded data """


def parse_blist(bdata):
    """ Convert bencoded data to python list """

    blist = []

    if bdata[0:1] == b"l":
        bdata = bdata[1:]

    while bdata[0:1] != b"" and bdata[0:1] != b"e":
        parse_func = btype_dict.get(bdata[0:1], parse_bstring)
        elem, bdata = parse_func(bdata)

        blist.append(elem)

    return blist, bdata[1:]


def parse_bdict(bdata):
    """ Convert bencoded data to python dict """

    bdict = {}

    if bdata[0:1] == b"d":
        bdata = bdata[1:]

    while bdata[0:1] != b"" and bdata[0:1] != b"e":

        parse_func = btype_dict.get(bdata[0:1], parse_bstring)
        key, bdata = parse_func(bdata)

        if bdata[0:1] == "" or bdata[0:1] == "e":
            value = None
        else:
            parse_func = btype_dict.get(bdata[0:1], parse_bstring)
            value, bdata = parse_func(bdata)

        if key in bdict:
            raise KeyError("Multiple keys in bencoded dictionary")

        bdict[key] = value

    return bdict, bdata[1:]


def parse_bint(bdata):
    """ Convert bencoded data to int """

    end_pos = bdata.index(ord("e"))
    num_str = bdata[1:end_pos]
    bdata = bdata[end_pos + 1 :]

    return int(num_str), bdata


def parse_bstring(bdata):
    """ Convert bencoded data to string """

    delim_pos = bdata.index(ord(":"))
    length = bdata[0:delim_pos]
    length = int(length)

    delim_pos += 1
    bstring = bdata[delim_pos : delim_pos + length]
    bdata = bdata[delim_pos + length :]

    if len(bstring) != length:
        raise ValueError("Incorrect bencoded string length")

    return bstring, bdata


def decode(bdata):
    """ Parse data and return a list of objects """

    return parse_blist(bdata)[0]


btype_dict = {b"d": parse_bdict, b"l": parse_blist, b"i": parse_bint}
#!/usr/bin/env python3 Module to construct / parse bencoded data Convert bencoded data to python list Convert bencoded data to python dict Convert bencoded data to int Convert bencoded data to string Parse data and return a list of objects