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use std::borrow::Borrow;
use std::cell::RefCell;
use std::io;
use std::rc::Rc;
use std::sync::Arc;
use crate::{Error, StrictDecode, StrictEncode};
impl StrictEncode for &[u8] {
fn strict_encode<E: io::Write>(&self, mut e: E) -> Result<usize, Error> {
let mut len = self.len();
len += len.strict_encode(&mut e)?;
e.write_all(self)?;
Ok(len)
}
}
impl<const LEN: usize> StrictEncode for [u8; LEN] {
fn strict_encode<E: io::Write>(&self, mut e: E) -> Result<usize, Error> {
if LEN > u16::MAX as usize {
return Err(Error::ExceedMaxItems(LEN));
}
e.write_all(self)?;
Ok(self.len())
}
}
impl<const LEN: usize> StrictDecode for [u8; LEN] {
fn strict_decode<D: io::Read>(mut d: D) -> Result<Self, Error> {
if LEN > u16::MAX as usize {
return Err(Error::ExceedMaxItems(LEN));
}
let mut ret = [0u8; LEN];
d.read_exact(&mut ret)?;
Ok(ret)
}
}
impl StrictEncode for Box<[u8]> {
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
<[u8]>::borrow(self).strict_encode(e)
}
}
impl StrictDecode for Box<[u8]> {
fn strict_decode<D: io::Read>(mut d: D) -> Result<Self, Error> {
let len = usize::strict_decode(&mut d)?;
let mut ret = vec![0u8; len];
d.read_exact(&mut ret)?;
Ok(ret.into_boxed_slice())
}
}
impl<T> StrictEncode for Rc<T>
where
T: StrictEncode,
{
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
T::borrow(self).strict_encode(e)
}
}
impl<T> StrictDecode for Rc<T>
where
T: StrictDecode,
{
fn strict_decode<D: io::Read>(d: D) -> Result<Self, Error> {
Ok(Rc::new(T::strict_decode(d)?))
}
}
impl<T> StrictEncode for RefCell<T>
where
T: StrictEncode,
{
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
self.borrow().strict_encode(e)
}
}
impl<T> StrictDecode for RefCell<T>
where
T: StrictDecode,
{
fn strict_decode<D: io::Read>(d: D) -> Result<Self, Error> {
Ok(RefCell::new(T::strict_decode(d)?))
}
}
impl<T> StrictEncode for Arc<T>
where
T: StrictEncode,
{
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
T::borrow(self).strict_encode(e)
}
}
impl<T> StrictDecode for Arc<T>
where
T: StrictDecode,
{
fn strict_decode<D: io::Read>(d: D) -> Result<Self, Error> {
Ok(Arc::new(T::strict_decode(d)?))
}
}
impl StrictEncode for &str {
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
self.as_bytes().strict_encode(e)
}
}
impl StrictEncode for String {
fn strict_encode<E: io::Write>(&self, e: E) -> Result<usize, Error> {
self.as_bytes().strict_encode(e)
}
}
impl StrictDecode for String {
fn strict_decode<D: io::Read>(d: D) -> Result<Self, Error> {
String::from_utf8(Vec::<u8>::strict_decode(d)?).map_err(Error::from)
}
}
#[cfg(test)]
pub mod test {
use crate::{strict_deserialize, strict_serialize};
fn gen_strings() -> Vec<&'static str> {
vec![
"",
"0",
" ",
"A string slice (&str) is made of bytes (u8), and a byte slice \
(&[u8]) is made of bytes, so this function converts between the \
two.Not all byte slices are valid string slices, however: &str \
requires that it is valid UTF-8. from_utf8() checks to ensure \
that the bytes are valid UTF-8, and then does the conversion.",
]
}
#[test]
fn test_encode_decode() {
gen_strings().into_iter().for_each(|s| {
let r = strict_serialize(&s).unwrap();
let p: String = strict_deserialize(r).unwrap();
assert_eq!(s, p);
})
}
#[test]
#[should_panic(expected = "DataNotEntirelyConsumed")]
fn test_consumation() {
gen_strings().into_iter().for_each(|s| {
let mut r = strict_serialize(&s).unwrap();
r.extend_from_slice("data".as_ref());
let _: String = strict_deserialize(r).unwrap();
})
}
#[test]
fn test_error_propagation() {
gen_strings().into_iter().for_each(|s| {
let r = strict_serialize(&s).unwrap();
let p: Result<String, _> = strict_deserialize(&r[..1]);
assert!(p.is_err());
})
}
}