use crate::{
constants::WORD_SIZE,
error::{Error, Result},
helpers::{pad_left, pad_right},
};
use serde::ser::{self, Serialize};
pub enum Value {
StaticType(Vec<u8>),
DynamicType(Vec<u8>),
}
pub struct Serializer {
packed: bool,
outputs: Vec<Value>,
}
pub fn to_vec<T>(value: &T) -> Result<Vec<u8>>
where
T: Serialize,
{
let mut serializer = Serializer {
packed: false,
outputs: vec![],
};
value.serialize(&mut serializer)?;
collect_output(serializer)
}
pub fn to_vec_packed<T>(value: &T) -> Result<Vec<u8>>
where
T: Serialize,
{
let mut serializer = Serializer {
packed: true,
outputs: vec![],
};
value.serialize(&mut serializer)?;
collect_output(serializer)
}
fn collect_output(serializer: Serializer) -> Result<Vec<u8>> {
let mut output: Vec<u8> = vec![];
let mut dynamic_types_output: Vec<u8> = vec![];
for value in &serializer.outputs {
match value {
Value::StaticType(bytes) => {
output.extend(bytes);
}
Value::DynamicType(bytes) => {
let index =
(serializer.outputs.len() * WORD_SIZE + dynamic_types_output.len()) as u64;
output.extend(to_vec(&index)?);
dynamic_types_output
.extend([to_vec(&bytes.len())?, pad_right(&bytes.to_vec())].concat());
}
}
}
Ok([output, dynamic_types_output].concat())
}
impl<'a> ser::Serializer for &'a mut Serializer {
type Ok = ();
type Error = Error;
type SerializeSeq = Self;
type SerializeTuple = Self;
type SerializeTupleStruct = Self;
type SerializeTupleVariant = Self;
type SerializeMap = Self;
type SerializeStruct = Self;
type SerializeStructVariant = Self;
fn serialize_bool(self, _v: bool) -> Result<()> {
Ok(())
}
fn serialize_i8(self, v: i8) -> Result<()> {
self.serialize_i64(i64::from(v))
}
fn serialize_i16(self, v: i16) -> Result<()> {
self.serialize_i64(i64::from(v))
}
fn serialize_i32(self, v: i32) -> Result<()> {
self.serialize_i64(i64::from(v))
}
fn serialize_i64(self, v: i64) -> Result<()> {
let bytes = if self.packed {
v.to_be_bytes().to_vec()
} else {
pad_left(&v.to_be_bytes())
};
self.outputs.push(Value::StaticType(bytes));
Ok(())
}
fn serialize_u8(self, v: u8) -> Result<()> {
self.serialize_u64(u64::from(v))
}
fn serialize_u16(self, v: u16) -> Result<()> {
self.serialize_u64(u64::from(v))
}
fn serialize_u32(self, v: u32) -> Result<()> {
self.serialize_u64(u64::from(v))
}
fn serialize_u64(self, v: u64) -> Result<()> {
let bytes = if self.packed {
v.to_be_bytes().to_vec()
} else {
pad_left(&v.to_be_bytes())
};
self.outputs.push(Value::StaticType(bytes));
Ok(())
}
fn serialize_f32(self, v: f32) -> Result<()> {
self.serialize_f64(f64::from(v))
}
fn serialize_f64(self, _v: f64) -> Result<()> {
Ok(())
}
fn serialize_char(self, v: char) -> Result<()> {
self.serialize_str(&v.to_string())
}
fn serialize_str(self, v: &str) -> Result<()> {
let bytes = v.as_bytes().to_vec();
self.outputs.push(Value::DynamicType(bytes.clone()));
Ok(())
}
fn serialize_bytes(self, v: &[u8]) -> Result<()> {
self.outputs.push(Value::StaticType(v.to_vec()));
Ok(())
}
fn serialize_none(self) -> Result<()> {
self.serialize_unit()
}
fn serialize_some<T>(self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(self)
}
fn serialize_unit(self) -> Result<()> {
Ok(())
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
self.serialize_unit()
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<()> {
self.serialize_str(variant)
}
fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(self)
}
fn serialize_newtype_variant<T>(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_value: &T,
) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
Ok(self)
}
fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
self.serialize_seq(Some(len))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeTupleStruct> {
self.serialize_seq(Some(len))
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant> {
Ok(self)
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
Ok(self)
}
fn serialize_struct(self, _name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
self.serialize_map(Some(len))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant> {
Ok(self)
}
}
impl<'a> ser::SerializeSeq for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_element<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)?;
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeTuple for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_element<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)?;
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeTupleStruct for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_field<T>(&mut self, _value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeTupleVariant for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_field<T>(&mut self, _value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeMap for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_key<T>(&mut self, _key: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn serialize_value<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeStruct for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_field<T>(&mut self, _key: &'static str, _value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a> ser::SerializeStructVariant for &'a mut Serializer {
type Ok = ();
type Error = Error;
fn serialize_field<T>(&mut self, _key: &'static str, _value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
Ok(())
}
fn end(self) -> Result<()> {
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::{to_vec, to_vec_packed};
use crate::{types::U256, Bytes32};
use hex_literal::hex;
use num_bigint::BigUint;
#[test]
fn test_u256() {
for (input, output) in [
(
256,
hex!("0000000000000000000000000000000000000000000000000000000000000100"),
),
(
123456_u64,
hex!("000000000000000000000000000000000000000000000000000000000001e240"),
),
]
.iter()
{
assert_eq!(to_vec(&U256(BigUint::from(*input))).unwrap(), output);
}
}
#[test]
fn test_tuple() {
for (input, output) in [(
(1u64),
hex!("0000000000000000000000000000000000000000000000000000000000000001"),
)]
.iter()
{
assert_eq!(to_vec(&input).unwrap(), output);
}
}
#[test]
fn test_bytes32() {
for (input, output) in [(
Bytes32([0; 32]),
hex!("0000000000000000000000000000000000000000000000000000000000000000"),
)]
.iter()
{
assert_eq!(to_vec(&input).unwrap(), output);
}
}
#[test]
fn test_big_int() {
for (input, output) in [(
U256(BigUint::from(10000u64) * BigUint::from(10u64).pow(14)),
hex!("0000000000000000000000000000000000000000000000000DE0B6B3A7640000"),
)]
.iter()
{
assert_eq!(to_vec(&input).unwrap(), output);
}
}
#[test]
fn test_i64() {
for (input, output) in [(
1i64,
hex!("0000000000000000000000000000000000000000000000000000000000000001"),
)]
.iter()
{
assert_eq!(to_vec(&input).unwrap(), output);
}
}
#[test]
fn test_i64_packed() {
for (input, output) in [(1i64, hex!("0000000000000001"))].iter() {
assert_eq!(to_vec_packed(&input).unwrap(), output);
}
}
#[test]
fn test_string() {
for (input, output) in [(
"gavofyork",
hex!(
"
0000000000000000000000000000000000000000000000000000000000000020
0000000000000000000000000000000000000000000000000000000000000009
6761766f66796f726b0000000000000000000000000000000000000000000000
"
),
)]
.iter()
{
assert_eq!(to_vec(&input).unwrap(), output);
}
}
}