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#[cfg(not(feature = "std"))]
use core as std;
use crate::{Block, FixedBitSet, BYTES};
use alloc::vec::Vec;
use core::{convert::TryFrom, fmt};
use serde::de::{self, Deserialize, Deserializer, MapAccess, SeqAccess, Visitor};
use serde::ser::{Serialize, SerializeStruct, Serializer};
struct BitSetByteSerializer<'a>(&'a FixedBitSet);
impl Serialize for FixedBitSet {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut struct_serializer = serializer.serialize_struct("FixedBitset", 2)?;
struct_serializer.serialize_field("length", &(self.length as u64))?;
struct_serializer.serialize_field("data", &BitSetByteSerializer(self))?;
struct_serializer.end()
}
}
impl<'a> Serialize for BitSetByteSerializer<'a> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let len = self.0.as_slice().len() * BYTES;
// PERF: Figure out a way to do this without allocating.
let mut temp = Vec::with_capacity(len);
for block in self.0.as_slice() {
temp.extend(&block.to_le_bytes());
}
serializer.serialize_bytes(&temp)
}
}
impl<'de> Deserialize<'de> for FixedBitSet {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
enum Field {
Length,
Data,
}
fn bytes_to_data(length: usize, input: &[u8]) -> Vec<Block> {
let block_len = length / BYTES + 1;
let mut data = Vec::with_capacity(block_len);
for chunk in input.chunks(BYTES) {
match <&[u8; BYTES]>::try_from(chunk) {
Ok(bytes) => data.push(usize::from_le_bytes(*bytes)),
Err(_) => {
let mut bytes = [0u8; BYTES];
bytes[0..BYTES].copy_from_slice(chunk);
data.push(usize::from_le_bytes(bytes));
}
}
}
data
}
impl<'de> Deserialize<'de> for Field {
fn deserialize<D>(deserializer: D) -> Result<Field, D::Error>
where
D: Deserializer<'de>,
{
struct FieldVisitor;
impl<'de> Visitor<'de> for FieldVisitor {
type Value = Field;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("`length` or `data`")
}
fn visit_str<E>(self, value: &str) -> Result<Field, E>
where
E: de::Error,
{
match value {
"length" => Ok(Field::Length),
"data" => Ok(Field::Data),
_ => Err(de::Error::unknown_field(value, FIELDS)),
}
}
}
deserializer.deserialize_identifier(FieldVisitor)
}
}
struct FixedBitSetVisitor;
impl<'de> Visitor<'de> for FixedBitSetVisitor {
type Value = FixedBitSet;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("struct Duration")
}
fn visit_seq<V>(self, mut seq: V) -> Result<FixedBitSet, V::Error>
where
V: SeqAccess<'de>,
{
let length = seq
.next_element()?
.ok_or_else(|| de::Error::invalid_length(0, &self))?;
let data: &[u8] = seq
.next_element()?
.ok_or_else(|| de::Error::invalid_length(1, &self))?;
let data = bytes_to_data(length, data);
Ok(FixedBitSet::with_capacity_and_blocks(length, data))
}
fn visit_map<V>(self, mut map: V) -> Result<FixedBitSet, V::Error>
where
V: MapAccess<'de>,
{
let mut length = None;
let mut temp: Option<&[u8]> = None;
while let Some(key) = map.next_key()? {
match key {
Field::Length => {
if length.is_some() {
return Err(de::Error::duplicate_field("length"));
}
length = Some(map.next_value()?);
}
Field::Data => {
if temp.is_some() {
return Err(de::Error::duplicate_field("data"));
}
temp = Some(map.next_value()?);
}
}
}
let length = length.ok_or_else(|| de::Error::missing_field("length"))?;
let data = temp.ok_or_else(|| de::Error::missing_field("data"))?;
let data = bytes_to_data(length, data);
Ok(FixedBitSet::with_capacity_and_blocks(length, data))
}
}
const FIELDS: &'static [&'static str] = &["length", "data"];
deserializer.deserialize_struct("Duration", FIELDS, FixedBitSetVisitor)
}
}
|
