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    use std::io;
    use hash::H256;
    use crypto::{DHash256, Digest};
    use ser::{Reader, Error as ReaderError, Deserializable};

    pub struct HashedData<T> {
    	pub size: usize,
    	pub hash: H256,
    	pub data: T,
    }

    pub trait ReadAndHash {
    	fn read_and_hash<T>(&mut self) -> Result<HashedData<T>, ReaderError> where T: Deserializable;
    }

    impl<R> ReadAndHash for Reader<R> where R: io::Read {
    	fn read_and_hash<T>(&mut self) -> Result<HashedData<T>, ReaderError> where T: Deserializable {
    		let mut size = 0usize;
    		let mut hasher = DHash256::new();
    		let data = self.read_with_proxy(|bytes| {
    			size += bytes.len();
    			hasher.input(bytes);
    		})?;

    		let result = HashedData {
    			hash: hasher.finish(),
    			data: data,
    			size: size,
    		};

    		Ok(result)
    	}
    }

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