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use num_bigint::{BigInt, Sign};
use serde::{Deserialize, Serialize};
use std::borrow::Cow;
#[derive(Serialize)]
#[serde(transparent)]
pub struct BigIntSer<'a>(#[serde(with = "self")] pub &'a BigInt);
#[derive(Deserialize, Serialize, Clone, Default, PartialEq)]
#[serde(transparent)]
pub struct BigIntDe(#[serde(with = "self")] pub BigInt);
pub fn serialize<S>(int: &BigInt, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let (sign, mut bz) = int.to_bytes_be();
match sign {
Sign::Minus => bz.insert(0, 1),
Sign::Plus => bz.insert(0, 0),
Sign::NoSign => bz = Vec::new(),
}
serde_bytes::Serialize::serialize(&bz, serializer)
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<BigInt, D::Error>
where
D: serde::Deserializer<'de>,
{
let bz: Cow<'de, [u8]> = serde_bytes::Deserialize::deserialize(deserializer)?;
if bz.is_empty() {
return Ok(BigInt::default());
}
let sign_byte = bz[0];
let sign: Sign = match sign_byte {
1 => Sign::Minus,
0 => Sign::Plus,
_ => {
return Err(serde::de::Error::custom(
"First byte must be valid sign (0, 1)",
));
}
};
Ok(BigInt::from_bytes_be(sign, &bz[1..]))
}
#[cfg(feature = "json")]
pub mod json {
use super::*;
use std::str::FromStr;
pub fn serialize<S>(int: &BigInt, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
String::serialize(&int.to_string(), serializer)
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<BigInt, D::Error>
where
D: serde::Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
BigInt::from_str(&s).map_err(serde::de::Error::custom)
}
pub mod opt {
use super::*;
use serde::{self, Deserialize, Deserializer, Serialize, Serializer};
pub fn serialize<S>(v: &Option<BigInt>, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
v.as_ref().map(|s| s.to_string()).serialize(serializer)
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<BigInt>, D::Error>
where
D: Deserializer<'de>,
{
let s: Option<String> = Deserialize::deserialize(deserializer)?;
if let Some(v) = s {
return Ok(Some(
BigInt::from_str(&v).map_err(serde::de::Error::custom)?,
));
}
Ok(None)
}
}
}