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# coding: utf-8
from ._version import version
from .exceptions import *

from collections import namedtuple


class ExtType(namedtuple('ExtType', 'code data')):
    """ExtType represents ext type in msgpack."""
    def __new__(cls, code, data):
        if not isinstance(code, int):
            raise TypeError("code must be int")
        if not isinstance(data, bytes):
            raise TypeError("data must be bytes")
        if not 0 <= code <= 127:
            raise ValueError("code must be 0~127")
        return super(ExtType, cls).__new__(cls, code, data)


import os
if os.environ.get('MSGPACK_PUREPYTHON'):
    from .fallback import Packer, unpackb, Unpacker
else:
    try:
        from ._cmsgpack import Packer, unpackb, Unpacker
    except ImportError:
        from .fallback import Packer, unpackb, Unpacker


def pack(o, stream, **kwargs):
    """
    Pack object `o` and write it to `stream`

    See :class:`Packer` for options.
    """
    packer = Packer(**kwargs)
    stream.write(packer.pack(o))


def packb(o, **kwargs):
    """
    Pack object `o` and return packed bytes

    See :class:`Packer` for options.
    """
    return Packer(**kwargs).pack(o)


def unpack(stream, **kwargs):
    """
    Unpack an object from `stream`.

    Raises `ExtraData` when `stream` contains extra bytes.
    See :class:`Unpacker` for options.
    """
    data = stream.read()
    return unpackb(data, **kwargs)


# alias for compatibility to simplejson/marshal/pickle.
load = unpack
loads = unpackb

dump = pack
dumps = packb