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#![cfg_attr(docsrs, doc(cfg(feature = "borsh")))]
use alloc::vec::Vec;
use core::hash::BuildHasher;
use core::hash::Hash;
use core::mem::size_of;
use borsh::error::ERROR_ZST_FORBIDDEN;
use borsh::io::{Error, ErrorKind, Read, Result, Write};
use borsh::{BorshDeserialize, BorshSerialize};
use crate::map::IndexMap;
use crate::set::IndexSet;
impl<K, V, S> BorshSerialize for IndexMap<K, V, S>
where
K: BorshSerialize,
V: BorshSerialize,
{
#[inline]
fn serialize<W: Write>(&self, writer: &mut W) -> Result<()> {
check_zst::<K>()?;
let iterator = self.iter();
u32::try_from(iterator.len())
.map_err(|_| ErrorKind::InvalidData)?
.serialize(writer)?;
for (key, value) in iterator {
key.serialize(writer)?;
value.serialize(writer)?;
}
Ok(())
}
}
impl<K, V, S> BorshDeserialize for IndexMap<K, V, S>
where
K: BorshDeserialize + Eq + Hash,
V: BorshDeserialize,
S: BuildHasher + Default,
{
#[inline]
fn deserialize_reader<R: Read>(reader: &mut R) -> Result<Self> {
check_zst::<K>()?;
let vec = <Vec<(K, V)>>::deserialize_reader(reader)?;
Ok(vec.into_iter().collect::<IndexMap<K, V, S>>())
}
}
impl<T, S> BorshSerialize for IndexSet<T, S>
where
T: BorshSerialize,
{
#[inline]
fn serialize<W: Write>(&self, writer: &mut W) -> Result<()> {
check_zst::<T>()?;
let iterator = self.iter();
u32::try_from(iterator.len())
.map_err(|_| ErrorKind::InvalidData)?
.serialize(writer)?;
for item in iterator {
item.serialize(writer)?;
}
Ok(())
}
}
impl<T, S> BorshDeserialize for IndexSet<T, S>
where
T: BorshDeserialize + Eq + Hash,
S: BuildHasher + Default,
{
#[inline]
fn deserialize_reader<R: Read>(reader: &mut R) -> Result<Self> {
check_zst::<T>()?;
let vec = <Vec<T>>::deserialize_reader(reader)?;
Ok(vec.into_iter().collect::<IndexSet<T, S>>())
}
}
fn check_zst<T>() -> Result<()> {
if size_of::<T>() == 0 {
return Err(Error::new(ErrorKind::InvalidData, ERROR_ZST_FORBIDDEN));
}
Ok(())
}
#[cfg(test)]
mod borsh_tests {
use super::*;
#[test]
fn map_borsh_roundtrip() {
let original_map: IndexMap<i32, i32> = {
let mut map = IndexMap::new();
map.insert(1, 2);
map.insert(3, 4);
map.insert(5, 6);
map
};
let serialized_map = borsh::to_vec(&original_map).unwrap();
let deserialized_map: IndexMap<i32, i32> =
BorshDeserialize::try_from_slice(&serialized_map).unwrap();
assert_eq!(original_map, deserialized_map);
}
#[test]
fn set_borsh_roundtrip() {
let original_map: IndexSet<i32> = [1, 2, 3, 4, 5, 6].into_iter().collect();
let serialized_map = borsh::to_vec(&original_map).unwrap();
let deserialized_map: IndexSet<i32> =
BorshDeserialize::try_from_slice(&serialized_map).unwrap();
assert_eq!(original_map, deserialized_map);
}
}