Function from_reader 

pub fn from_reader<T: DeserializeOwned, R: Read>(reader: R) -> Result<T, Error>

Deserializes a data item from a reader.

The reader is read to the end, no data may follow the item. The reader does not need to be buffered. To read more than one item (a CBOR sequence) use DeserializerConfig::reader.

let value: Vec<u32> =
    deser_cbor::from_reader(&[0x82, 0x01, 0x02][..]).unwrap();
assert_eq!(value, [1, 2]);