import collections
+import functools
import io
+import struct
TAG_NULL = 0x00
TAG_TRUE = 0x01
TAG_FALSE = 0x02
+TAG_UINT8 = 0x03
+TAG_UINT16 = 0x04
+TAG_UINT32 = 0x05
+TAG_UINT64 = 0x06
TaggedObject = collections.namedtuple(
'TaggedObject',
return serializer
+def _make_struct_serializer(fmt):
+ fmt = '!B' + fmt
+ packer = functools.partial(struct.pack, fmt)
+
+ def serializer(to):
+ return packer(to.tag, to.instance)
+
+ return serializer
+
_TAGS_TO_SERIALIZERS = {
TAG_NULL: _make_tag_only_serializer(TAG_NULL, None),
TAG_TRUE: _make_tag_only_serializer(TAG_TRUE, True),
TAG_FALSE: _make_tag_only_serializer(TAG_FALSE, False),
+ TAG_UINT8: _make_struct_serializer('B'),
+ TAG_UINT16: _make_struct_serializer('H'),
+ TAG_UINT32: _make_struct_serializer('I'),
+ TAG_UINT64: _make_struct_serializer('Q'),
}
def serialize(to):
return parser
+def _make_struct_deserializer(tag, fmt):
+ fmt = '!' + fmt
+ size = struct.calcsize(fmt)
+ unpacker = functools.partial(struct.unpack, fmt)
+
+ def parser(b):
+ b = b.read(size)
+ assert len(b) == size
+ return TaggedObject(tag = tag, instance = unpacker(b)[0])
+
+ return parser
+
_TAGS_TO_PARSERS = {
TAG_NULL: _make_tag_only_parser(TAG_NULL, None),
TAG_TRUE: _make_tag_only_parser(TAG_TRUE, True),
TAG_FALSE: _make_tag_only_parser(TAG_FALSE, False),
+ TAG_UINT8: _make_struct_deserializer(TAG_UINT8, 'B'),
+ TAG_UINT16: _make_struct_deserializer(TAG_UINT16, 'H'),
+ TAG_UINT32: _make_struct_deserializer(TAG_UINT32, 'I'),
+ TAG_UINT64: _make_struct_deserializer(TAG_UINT64, 'Q'),
}
def deserialize(b):