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use bincode::SizeLimit;
use bincode::rustc_serialize::{decode_from, DecodingError, encode, encode_into, EncodingError};
use rustc_serialize::{Encodable, Decodable};
use std::io::{Read, Write, Cursor};
const UPPER_LIMIT: SizeLimit = SizeLimit::Bounded(1 << 21);
quick_error! {
#[derive(Debug)]
pub enum SerialisationError {
Serialise(err: EncodingError) {
description("Serialise error")
display("Serialise error: {}", err)
cause(err)
from()
}
Deserialise(err: DecodingError) {
description("Deserialise error")
display("Deserialise error: {}", err)
cause(err)
from()
}
}
}
pub fn serialise<T>(data: &T) -> Result<Vec<u8>, SerialisationError>
where T: Encodable
{
encode(data, UPPER_LIMIT).map_err(From::from)
}
pub fn serialise_with_limit<T>(data: &T,
size_limit: SizeLimit)
-> Result<Vec<u8>, SerialisationError>
where T: Encodable
{
encode(data, size_limit).map_err(From::from)
}
pub fn deserialise<T>(data: &[u8]) -> Result<T, SerialisationError>
where T: Decodable
{
let mut data = Cursor::new(data);
deserialise_from(&mut data)
}
pub fn deserialise_with_limit<T>(data: &[u8],
size_limit: SizeLimit)
-> Result<T, SerialisationError>
where T: Decodable
{
let mut data = Cursor::new(data);
deserialise_from_with_limit(&mut data, size_limit)
}
pub fn serialise_into<T: Encodable, W: Write>(data: &T,
write: &mut W)
-> Result<(), SerialisationError> {
encode_into(data, write, UPPER_LIMIT).map_err(From::from)
}
pub fn serialise_into_with_limit<T: Encodable, W: Write>(data: &T,
write: &mut W,
size_limit: SizeLimit)
-> Result<(), SerialisationError> {
encode_into(data, write, size_limit).map_err(From::from)
}
pub fn deserialise_from<R: Read, T: Decodable>(read: &mut R) -> Result<T, SerialisationError> {
decode_from(read, UPPER_LIMIT).map_err(From::from)
}
pub fn deserialise_from_with_limit<R: Read, T: Decodable>(read: &mut R,
size_limit: SizeLimit)
-> Result<T, SerialisationError> {
decode_from(read, size_limit).map_err(From::from)
}
#[cfg(test)]
mod test {
use super::*;
use std::io::Cursor;
use bincode::SizeLimit;
use bincode::rustc_serialize::{DecodingError, encode, EncodingError};
#[test]
fn serialise_deserialise() {
let original_data = (vec![0u8, 1, 3, 9], vec![-1i64, 888, -8765], "Some-String".to_owned());
let serialised_data = unwrap!(serialise(&original_data));
let deserialised_data: (Vec<u8>, Vec<i64>, String) = unwrap!(deserialise(&serialised_data));
assert_eq!(original_data, deserialised_data);
}
#[test]
fn serialise_into_deserialise_from() {
let original_data = (vec![0u8, 1, 3, 9], vec![-1i64, 888, -8765], "Some-String".to_owned());
let mut serialised_data = vec![];
unwrap!(serialise_into(&original_data, &mut serialised_data));
let mut serialised = Cursor::new(serialised_data);
let deserialised_data: (Vec<u8>, Vec<i64>, String) =
unwrap!(deserialise_from(&mut serialised));
assert_eq!(original_data, deserialised_data);
}
#[test]
fn upper_limit() {
let upper_limit = match super::UPPER_LIMIT {
SizeLimit::Bounded(limit) => limit,
SizeLimit::Infinite => panic!("Test expects a bounded limit"),
};
let mut original_data = (1u64..(upper_limit / 8)).collect::<Vec<_>>();
let mut serialised_data = unwrap!(serialise(&original_data));
let mut deserialised_data: Vec<u64> = unwrap!(deserialise(&serialised_data));
assert!(original_data == deserialised_data);
serialised_data.clear();
unwrap!(serialise_into(&original_data, &mut serialised_data));
let mut serialised = Cursor::new(serialised_data);
deserialised_data = unwrap!(deserialise_from(&mut serialised));
assert_eq!(original_data, deserialised_data);
original_data.push(0);
if let Err(SerialisationError::Serialise(EncodingError::SizeLimit)) =
serialise(&original_data) {} else {
panic!("Expected size limit error.");
}
let mut buffer = vec![];
if let Err(SerialisationError::Serialise(EncodingError::SizeLimit)) =
serialise_into(&original_data, &mut buffer) {} else {
panic!("Expected size limit error.");
}
let excessive = unwrap!(encode(&original_data, SizeLimit::Infinite));
if let Err(SerialisationError::Deserialise(DecodingError::SizeLimit)) =
deserialise::<Vec<u64>>(&excessive) {} else {
panic!("Expected size limit error.");
}
serialised = Cursor::new(excessive);
if let Err(SerialisationError::Deserialise(DecodingError::SizeLimit)) =
deserialise_from::<Cursor<_>, Vec<u64>>(&mut serialised) {} else {
panic!("Expected size limit error.");
}
serialised_data = unwrap!(serialise_with_limit(&original_data, SizeLimit::Infinite));
buffer = Vec::with_capacity(serialised_data.len());
unwrap!(serialise_into_with_limit(&original_data, &mut buffer, SizeLimit::Infinite));
assert_eq!(serialised_data, buffer);
let deserialised_data_0: Vec<u64> = unwrap!(deserialise_with_limit(&serialised_data,
SizeLimit::Infinite));
assert_eq!(original_data, deserialised_data_0);
let deserialised_data_1: Vec<u64> =
unwrap!(deserialise_from_with_limit(&mut Cursor::new(buffer), SizeLimit::Infinite));
assert_eq!(original_data, deserialised_data_1);
}
}