use crate::error::Error;
use byteorder::{LittleEndian, WriteBytesExt};
use serde::ser;
pub struct Serializer<'a> {
writer: &'a mut std::io::Write,
}
impl<'a> Serializer<'a> {
pub fn new(writer: &'a mut std::io::Write) -> Self {
Self { writer }
}
fn write_signed(&mut self, val: i64) -> Result<usize, std::io::Error> {
leb128::write::signed(&mut self.writer, val)
}
fn write_unsigned(&mut self, val: u64) -> Result<usize, std::io::Error> {
leb128::write::unsigned(&mut self.writer, val)
}
}
impl<'a, 'b> ser::Serializer for &'a mut Serializer<'b> {
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<(), Error> {
self.write_unsigned(if v { 1 } else { 0 })?;
Ok(())
}
fn serialize_unit(self) -> Result<(), Error> {
Ok(())
}
fn serialize_unit_struct(self, _: &'static str) -> Result<(), Error> {
Ok(())
}
fn serialize_u8(self, v: u8) -> Result<(), Error> {
self.writer.write_u8(v as _)?;
Ok(())
}
fn serialize_u16(self, v: u16) -> Result<(), Error> {
self.write_unsigned(v as _)?;
Ok(())
}
fn serialize_u32(self, v: u32) -> Result<(), Error> {
self.write_unsigned(v as _)?;
Ok(())
}
fn serialize_u64(self, v: u64) -> Result<(), Error> {
self.write_unsigned(v as _)?;
Ok(())
}
fn serialize_i8(self, v: i8) -> Result<(), Error> {
self.writer.write_i8(v as _)?;
Ok(())
}
fn serialize_i16(self, v: i16) -> Result<(), Error> {
self.write_signed(v as _)?;
Ok(())
}
fn serialize_i32(self, v: i32) -> Result<(), Error> {
self.write_signed(v as _)?;
Ok(())
}
fn serialize_i64(self, v: i64) -> Result<(), Error> {
self.write_signed(v as _)?;
Ok(())
}
fn serialize_f32(self, v: f32) -> Result<(), Error> {
self.writer.write_f32::<LittleEndian>(v)?;
Ok(())
}
fn serialize_f64(self, v: f64) -> Result<(), Error> {
self.writer.write_f64::<LittleEndian>(v)?;
Ok(())
}
fn serialize_str(self, v: &str) -> Result<(), Error> {
self.serialize_bytes(v.as_bytes())
}
fn serialize_char(self, c: char) -> Result<(), Error> {
self.serialize_u32(c as u32)
}
fn serialize_bytes(self, v: &[u8]) -> Result<(), Error> {
self.serialize_u64(v.len() as u64)?;
self.writer.write_all(v)?;
Ok(())
}
fn serialize_none(self) -> Result<(), Error> {
self.serialize_u8(0)
}
fn serialize_some<T: serde::Serialize + ?Sized>(self, v: &T) -> Result<(), Error> {
self.serialize_u8(1)?;
v.serialize(self)
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Error> {
let len = len.ok_or(Error::SequenceMustHaveLength)?;
self.serialize_u64(len as u64)?;
Ok(self)
}
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Error> {
Ok(self)
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct, Error> {
Ok(self)
}
fn serialize_tuple_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant, Error> {
self.serialize_u32(variant_index)?;
Ok(self)
}
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Error> {
let len = len.ok_or(Error::SequenceMustHaveLength)?;
self.serialize_u64(len as u64)?;
Ok(self)
}
fn serialize_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeStruct, Error> {
Ok(self)
}
fn serialize_struct_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Error> {
self.serialize_u32(variant_index)?;
Ok(self)
}
fn serialize_newtype_struct<T: ?Sized>(
self,
_name: &'static str,
value: &T,
) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(self)
}
fn serialize_newtype_variant<T: ?Sized>(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
value: &T,
) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
self.serialize_u32(variant_index)?;
value.serialize(self)
}
fn serialize_unit_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
) -> Result<(), Error> {
self.serialize_u32(variant_index)
}
fn is_human_readable(&self) -> bool {
false
}
}
impl<'a, 'b> ser::SerializeSeq for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeTuple for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeTupleStruct for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeTupleVariant for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeMap for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_key<K: ?Sized>(&mut self, value: &K) -> Result<(), Error>
where
K: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn serialize_value<V: ?Sized>(&mut self, value: &V) -> Result<(), Error>
where
V: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeStruct for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, _key: &'static str, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}
impl<'a, 'b> ser::SerializeStructVariant for &'a mut Serializer<'b> {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, _key: &'static str, value: &T) -> Result<(), Error>
where
T: serde::ser::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<(), Error> {
Ok(())
}
}