8000 Trying to unpack a custom type with Python 3.5.2 on Windows raises a MemoryError · Issue #201 · msgpack/msgpack-python · GitHub
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Trying to unpack a custom type with Python 3.5.2 on Windows raises a MemoryError #201
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@sekrause

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@sekrause

I have the following test script that packs a custom type and unpacks it again:

import msgpack

_MyClass_Type = 12


class MyClass:
    def __init__(self, data):
        self.data = data


def _msgpack_encoder(obj):
    if isinstance(obj, MyClass):
        return msgpack.ExtType(_MyClass_Type, obj.data)
    else:
        raise TypeError("Unknown type: %r" % (obj,))


def _msgpack_decoder(code, data):
    if code == _MyClass_Type:
        return MyClass(data)
    else:
        return msgpack.ExtType(code, data)


o = MyClass(b'test')
packed = msgpack.packb(o, default=_msgpack_encoder, use_bin_type=True)
print('packed:', packed)
unpacked = msgpack.unpackb(packed, ext_hook=_msgpack_decoder, encoding='utf-8')
print('unpacked:', unpacked.data)

It works fine with e.g. Python 3.4 on Windows or Python 3.5 on Linux.

However, the combination of Windows and Python 3.5.2 (in my case 64-bit) raises the following exception:

Traceback (most recent call last):
  File "msgpack_test.py", line 28, in <module>
    unpacked = msgpack.unpackb(packed, ext_hook=_msgpack_decoder, encoding='utf-8')
  File "msgpack\_unpacker.pyx", line 138, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:138)
MemoryError

This error happens in 0.4.6, 0.4.7 and the current Github-Master, but only when I use Python 3.5.2 on Windows.

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