use serde::{ser, Serialize};
use crate::error::{Error, Result};
use crate::ser::flavors::Flavor;
use crate::varint::*;
pub struct Serializer<F>
where
F: Flavor,
{
pub output: F,
}
impl<F: Flavor> Serializer<F> {
#[inline]
pub(crate) fn try_push_varint_usize(&mut self, data: usize) -> Result<()> {
let mut buf = [0u8; varint_max::<usize>()];
let used_buf = varint_usize(data, &mut buf);
self.output.try_extend(used_buf)
}
#[inline]
pub(crate) fn try_push_varint_u128(&mut self, data: u128) -> Result<()> {
let mut buf = [0u8; varint_max::<u128>()];
let used_buf = varint_u128(data, &mut buf);
self.output.try_extend(used_buf)
}
#[inline]
pub(crate) fn try_push_varint_u64(&mut self, data: u64) -> Result<()> {
let mut buf = [0u8; varint_max::<u64>()];
let used_buf = varint_u64(data, &mut buf);
self.output.try_extend(used_buf)
}
#[inline]
pub(crate) fn try_push_varint_u32(&mut self, data: u32) -> Result<()> {
let mut buf = [0u8; varint_max::<u32>()];
let used_buf = varint_u32(data, &mut buf);
self.output.try_extend(used_buf)
}
#[inline]
pub(crate) fn try_push_varint_u16(&mut self, data: u16) -> Result<()> {
let mut buf = [0u8; varint_max::<u16>()];
let used_buf = varint_u16(data, &mut buf);
self.output.try_extend(used_buf)
}
}
impl<'a, F> ser::Serializer for &'a mut Serializer<F>
where
F: Flavor,
{
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;
#[inline]
fn is_human_readable(&self) -> bool {
false
}
#[inline]
fn serialize_bool(self, v: bool) -> Result<()> {
self.serialize_u8(if v { 1 } else { 0 })
}
#[inline]
fn serialize_i8(self, v: i8) -> Result<()> {
self.serialize_u8(v.to_le_bytes()[0])
}
#[inline]
fn serialize_i16(self, v: i16) -> Result<()> {
let zzv = zig_zag_i16(v);
self.try_push_varint_u16(zzv)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_i32(self, v: i32) -> Result<()> {
let zzv = zig_zag_i32(v);
self.try_push_varint_u32(zzv)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_i64(self, v: i64) -> Result<()> {
let zzv = zig_zag_i64(v);
self.try_push_varint_u64(zzv)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_i128(self, v: i128) -> Result<()> {
let zzv = zig_zag_i128(v);
self.try_push_varint_u128(zzv)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_u8(self, v: u8) -> Result<()> {
self.output
.try_push(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_u16(self, v: u16) -> Result<()> {
self.try_push_varint_u16(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_u32(self, v: u32) -> Result<()> {
self.try_push_varint_u32(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_u64(self, v: u64) -> Result<()> {
self.try_push_varint_u64(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_u128(self, v: u128) -> Result<()> {
self.try_push_varint_u128(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_f32(self, v: f32) -> Result<()> {
let buf = v.to_bits().to_le_bytes();
self.output
.try_extend(&buf)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_f64(self, v: f64) -> Result<()> {
let buf = v.to_bits().to_le_bytes();
self.output
.try_extend(&buf)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_char(self, v: char) -> Result<()> {
let mut buf = [0u8; 4];
let strsl = v.encode_utf8(&mut buf);
strsl.serialize(self)
}
#[inline]
fn serialize_str(self, v: &str) -> Result<()> {
self.try_push_varint_usize(v.len())
.map_err(|_| Error::SerializeBufferFull)?;
self.output
.try_extend(v.as_bytes())
.map_err(|_| Error::SerializeBufferFull)?;
Ok(())
}
#[inline]
fn serialize_bytes(self, v: &[u8]) -> Result<()> {
self.try_push_varint_usize(v.len())
.map_err(|_| Error::SerializeBufferFull)?;
self.output
.try_extend(v)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_none(self) -> Result<()> {
self.serialize_u8(0)
}
#[inline]
fn serialize_some<T>(self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
self.serialize_u8(1)?;
value.serialize(self)
}
#[inline]
fn serialize_unit(self) -> Result<()> {
Ok(())
}
#[inline]
fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
Ok(())
}
#[inline]
fn serialize_unit_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
) -> Result<()> {
self.try_push_varint_u32(variant_index)
.map_err(|_| Error::SerializeBufferFull)
}
#[inline]
fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(self)
}
#[inline]
fn serialize_newtype_variant<T>(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
value: &T,
) -> Result<()>
where
T: ?Sized + Serialize,
{
self.try_push_varint_u32(variant_index)
.map_err(|_| Error::SerializeBufferFull)?;
value.serialize(self)
}
#[inline]
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
self.try_push_varint_usize(len.ok_or(Error::SerializeSeqLengthUnknown)?)
.map_err(|_| Error::SerializeBufferFull)?;
Ok(self)
}
#[inline]
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
Ok(self)
}
#[inline]
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct> {
Ok(self)
}
#[inline]
fn serialize_tuple_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant> {
self.try_push_varint_u32(variant_index)
.map_err(|_| Error::SerializeBufferFull)?;
Ok(self)
}
#[inline]
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> {
self.try_push_varint_usize(len.ok_or(Error::SerializeSeqLengthUnknown)?)
.map_err(|_| Error::SerializeBufferFull)?;
Ok(self)
}
#[inline]
fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
Ok(self)
}
#[inline]
fn serialize_struct_variant(
self,
_name: &'static str,
variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant> {
self.try_push_varint_u32(variant_index)
.map_err(|_| Error::SerializeBufferFull)?;
Ok(self)
}
#[inline]
fn collect_str<T>(self, value: &T) -> Result<Self::Ok>
where
T: core::fmt::Display + ?Sized,
{
use core::fmt::Write;
struct CountWriter {
ct: usize,
}
impl Write for CountWriter {
fn write_str(&mut self, s: &str) -> core::result::Result<(), core::fmt::Error> {
self.ct += s.as_bytes().len();
Ok(())
}
}
let mut ctr = CountWriter { ct: 0 };
write!(&mut ctr, "{}", value).map_err(|_| Error::CollectStrError)?;
let len = ctr.ct;
self.try_push_varint_usize(len)
.map_err(|_| Error::SerializeBufferFull)?;
struct FmtWriter<'a, IF>
where
IF: Flavor,
{
output: &'a mut IF,
}
impl<'a, IF> Write for FmtWriter<'a, IF>
where
IF: Flavor,
{
fn write_str(&mut self, s: &str) -> core::result::Result<(), core::fmt::Error> {
self.output
.try_extend(s.as_bytes())
.map_err(|_| core::fmt::Error)
}
}
let mut fw = FmtWriter {
output: &mut self.output,
};
write!(&mut fw, "{}", value).map_err(|_| Error::CollectStrError)?;
Ok(())
}
}
impl<'a, F> ser::SerializeSeq for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeTuple for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeTupleStruct for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeTupleVariant for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeMap for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_key<T>(&mut self, key: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
key.serialize(&mut **self)
}
#[inline]
fn serialize_value<T>(&mut self, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeStruct for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T>(&mut self, _key: &'static str, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
impl<'a, F> ser::SerializeStructVariant for &'a mut Serializer<F>
where
F: Flavor,
{
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T>(&mut self, _key: &'static str, value: &T) -> Result<()>
where
T: ?Sized + Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<()> {
Ok(())
}
}
fn zig_zag_i16(n: i16) -> u16 {
((n << 1) ^ (n >> 15)) as u16
}
fn zig_zag_i32(n: i32) -> u32 {
((n << 1) ^ (n >> 31)) as u32
}
fn zig_zag_i64(n: i64) -> u64 {
((n << 1) ^ (n >> 63)) as u64
}
fn zig_zag_i128(n: i128) -> u128 {
((n << 1) ^ (n >> 127)) as u128
}