__slots__ = ('_bitstore')

@classmethod

def _initialise_options(cls):

def _readbytes(self, start: int, length: int) -> bytes:

"""Read bytes and return them. Note that length is in bits."""

assert length % 8 == 0

return self._bitstore.getslice(slice(start, start + length, None)).tobytes()

def _getbytes(self) -> bytes:

def _readtoken(self, name: str, pos: int, length: Optional[int]) -> Tuple[Union[float, int, str, None, Bits], int]:

"""Reads a token from the bitstring and returns the result."""

dtype = Bits._register.get_dtype(name, length)

try:

val = dtype.read_fn(self, pos)

if isinstance(val, tuple):

return val

else:

assert length is not None

except KeyError:

raise ValueError(f"Can't parse token {name}:{length}")

if isinstance(length_, str):

if length_ in kwargs:

int_length = kwargs[length_]

else:

int_length = length_

return int_length

for token in tokens:

name, length, _ = token

length = convert_length_strings(length)

if stretchy_token:

if name in Bits._register.unknowable_length_names():

raise Error(f"It's not possible to parse a variable length token ('{name}') after a 'filler' token.")

if token is stretchy_token:

# Set length to the remaining bits

length = max(bits_left - bits_after_stretchy_token, 0)

length = convert_length_strings(length)

value, newpos = self._readtoken(name, pos, length)

bits_left -= newpos - pos

pos = newpos

from bitstring.fp8 import fp143_fmt, fp152_fmt

from bitstring.bitstore import BitStore

byteorder: str = sys.byteorder

from bitstring.bitarray import BitArray

from bitstring.utils import tokenparser

from bitstring.exceptions import ReadError, ByteAlignError, CreationError, InterpretError

from typing import Union, List, Any, Optional, overload, TypeVar, Tuple

import copy

import numbers

def read(self, fmt: str) -> Any:

...

"""Interpret next bits according to the format string and return result.

bs = self._slice(self._pos, self._pos + fmt)

self._pos += fmt

return bs

p = self._pos

_, token = tokenparser(fmt)

if len(token) != 1:

from __future__ import annotations

import functools

from bitstring.bits import Bits

from typing import Optional, Dict, List, Any

from bitstring.utils import parse_name_length_token

class Dtype:

def __new__(cls, token: Optional[str] = None) -> Dtype:

if token is not None:

else:

return super(Dtype, cls).__new__(cls)

@classmethod

x = cls.__new__(cls)

x.name = name

x.length = length

if set_fn is None:

x.set_fn = None

else:

x.get_fn = get_fn

x.is_integer = is_integer

x.is_signed = is_signed

# Represents a class of dtypes, such as uint or float, rather than a concrete dtype such as uint8.

def __init__(self, name: str, description: str, set_fn, read_fn, get_fn, is_integer: bool, is_float: bool, is_signed: bool,

# Consistency checks

if is_unknown_length and length is not None:

raise ValueError("Can't set is_unknown_length and give a value for length.")

self.is_fixed_length = length is not None

self.is_unknown_length = is_unknown_length

self.length = length

self.set_fn = set_fn

self.read_fn = read_fn # With a start and usually a length

if not self.is_fixed_length and not self.is_unknown_length:

raise ValueError(f"No length given for dtype '{self.name}', and meta type is not fixed length.")

d = Dtype.create(self.name, None, self.set_fn, self.read_fn, self.get_fn, self.is_integer, self.is_float, self.is_signed,

return d

if self.is_unknown_length:

raise ValueError("Length shouldn't be supplied for dtypes that are variable length.")

raise ValueError # TODO

length = self.length

d = Dtype.create(self.name, length, self.set_fn, self.read_fn, self.get_fn, self.is_integer, self.is_float, self.is_signed,

return d

_instance: Optional[Register] = None

def __new__(cls) -> Register:

if cls._instance is None:

cls._instance = super(Register, cls).__new__(cls)

cls.name_to_meta_dtype: Dict[str, MetaDtype] = {}

d = meta_type.getDtype(length)

# Test if the length makes sense by trying out the getter. # TODO: Optimise!

if length != 0 and not d.is_unknown_length:

try:

_ = d.read_fn(temp, 0)

except InterpretError as e:

return d

# TODO: This should be only calculated if the register has been altered since the last time it was called.

continue

if length is not None:

length = int(length)

if value is None and name != 'pad':

# Take the next value from the ones provided

value = next(value_iter)

# Any single token with just a name and length

m = SINGLE_STRUCT_PACK_RE.match(fmt)

if m:

raise ValueError(f"{name} tokens can only be {token_length} bits long, not {length} bits.")

length = token_length

return name, length

length = int(length)

if length < 0:

raise Error

except Error:

raise ValueError("Can't read a token with a negative length.")

except ValueError:

If you're in an interactive session then the pretty-print method :meth:`~Bits.pp` can be useful as it will only convert the bitstring one chunk at a time for display.

Short Interpretations

a.rol(-1)

def testBytesToken(self):

b = a.read('bytes:1')

self.assertTrue(isinstance(b, bytes))

x, y, z = a.unpack('uint:4, bytes:2, uint')

self.assertEqual(y, b'\x10\x20')

self.assertEqual(z, 3)

s = pack('bytes:4', b'abcd')

a = pack('uint:p=33', p=12)

with self.assertRaises(ValueError):

a.unpack('uint:p')

a.unpack('uint:p', p='a_string')

def testAll(self):

exported = ['ConstBitStream', 'BitStream', 'BitArray',

'Bits', 'pack', 'Error', 'ReadError', 'Array',

self.assertEqual(set(bitstring.__all__), set(exported))

def testReverseDict(self):