Function read_bytes8

Lib/pickletools.py:534–556

r""" >>> import io, struct, sys >>> read_bytes8(io.BytesIO(b"\x00\x00\x00\x00\x00\x00\x00\x00abc")) b'' >>> read_bytes8(io.BytesIO(b"\x03\x00\x00\x00\x00\x00\x00\x00abcdef")) b'abc' >>> bigsize8 = struct.pack(" >> read_bytes8(io.BytesIO(bigsize8 + b"a

(f)

def read_bytes8(f):
    r"""
    >>> import io, struct, sys
    >>> read_bytes8(io.BytesIO(b"\x00\x00\x00\x00\x00\x00\x00\x00abc"))
    b''
    >>> read_bytes8(io.BytesIO(b"\x03\x00\x00\x00\x00\x00\x00\x00abcdef"))
    b'abc'
    >>> bigsize8 = struct.pack("<Q", sys.maxsize//3)
    >>> read_bytes8(io.BytesIO(bigsize8 + b"abcdef"))  #doctest: +ELLIPSIS
    Traceback (most recent call last):
    ...
    ValueError: expected ... bytes in a bytes8, but only 6 remain
    """

    n = read_uint8(f)
    assert n >= 0
    if n > sys.maxsize:
        raise ValueError("bytes8 byte count > sys.maxsize: %d" % n)
    data = f.read(n)
    if len(data) == n:
        return data
    raise ValueError("expected %d bytes in a bytes8, but only %d remain" %
                     (n, len(data)))

bytes8 = ArgumentDescriptor(
              name="bytes8",