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use crate::internal::tags;
use crate::internal::variant::Variant;
use crate::{PuroroError, Result};
use ::std::convert::TryFrom;
use ::std::io::{Result as IoResult, Write};
use ::std::iter;
#[derive(Debug, Clone, PartialEq)]
pub enum FieldData<T> {
Variant(Variant),
LengthDelimited(T),
Bits32([u8; 4]),
Bits64([u8; 8]),
}
#[derive(Debug, Clone, PartialEq)]
pub enum WireType {
Variant = 0,
Bits64 = 1,
LengthDelimited = 2,
StartGroup = 3,
EndGroup = 4,
Bits32 = 5,
}
impl<T> FieldData<T> {
pub fn as_mut(&mut self) -> FieldData<&mut T> {
match self {
FieldData::Variant(x) => FieldData::Variant(x.clone()),
FieldData::LengthDelimited(x) => FieldData::LengthDelimited(x),
FieldData::Bits32(x) => FieldData::Bits32(x.clone()),
FieldData::Bits64(x) => FieldData::Bits64(x.clone()),
}
}
pub fn map<U, F>(self, f: F) -> FieldData<U>
where
F: FnOnce(T) -> U,
{
match self {
FieldData::Variant(x) => FieldData::Variant(x),
FieldData::LengthDelimited(x) => FieldData::LengthDelimited((f)(x)),
FieldData::Bits32(x) => FieldData::Bits32(x),
FieldData::Bits64(x) => FieldData::Bits64(x),
}
}
pub fn wire_type(&self) -> WireType {
match self {
FieldData::Variant(_) => WireType::Variant,
FieldData::LengthDelimited(_) => WireType::LengthDelimited,
FieldData::Bits32(_) => WireType::Bits32,
FieldData::Bits64(_) => WireType::Bits64,
}
}
}
impl<T, E> FieldData<::std::result::Result<T, E>> {
pub fn transpose(self) -> ::std::result::Result<FieldData<T>, E> {
Ok(match self {
FieldData::Variant(x) => FieldData::Variant(x),
FieldData::LengthDelimited(x) => FieldData::LengthDelimited(x?),
FieldData::Bits32(x) => FieldData::Bits32(x),
FieldData::Bits64(x) => FieldData::Bits64(x),
})
}
}
impl<'a, I: Iterator<Item = IoResult<u8>>> FieldData<iter::Take<&'a mut I>> {
pub fn from_bytes_iter<'b: 'a>(bytes: &'b mut I) -> Result<Option<(i32, Self)>> {
if let Some(var) = Variant::decode_bytes(bytes.by_ref())? {
let var_u32 = var.get_u32()?;
let wire_type: WireType = (var_u32 & 0x7).try_into()?;
let number = (var_u32 >> 3) as i32;
let field_data = match wire_type {
WireType::Variant => FieldData::Variant(
Variant::decode_bytes(bytes)?.ok_or(PuroroError::UnexpectedInputTermination)?,
),
WireType::LengthDelimited => {
let length: usize = Variant::decode_bytes(bytes.by_ref())?
.ok_or(PuroroError::UnexpectedInputTermination)?
.get_i32()?
.try_into()?;
FieldData::LengthDelimited(bytes.take(length))
}
WireType::StartGroup => todo!(),
WireType::EndGroup => todo!(),
WireType::Bits32 => {
let bits32 = [
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
];
FieldData::Bits32(bits32)
}
WireType::Bits64 => {
let bits64 = [
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
read_byte(bytes.by_ref())?,
];
FieldData::Bits64(bits64)
}
};
Ok(Some((number, field_data)))
} else {
Ok(None)
}
}
}
impl TryFrom<u32> for WireType {
type Error = PuroroError;
fn try_from(value: u32) -> ::std::result::Result<Self, Self::Error> {
Ok(match value {
0 => WireType::Variant,
1 => WireType::Bits64,
2 => WireType::LengthDelimited,
3 => WireType::StartGroup,
4 => WireType::EndGroup,
5 => WireType::Bits32,
_ => Err(PuroroError::InvalidWireType(value))?,
})
}
}
pub(crate) fn ser_wire_and_number<W: Write>(
wire: WireType,
number: i32,
out: &mut W,
) -> Result<()> {
let var = Variant::from_u32(((number << 3) | (wire as i32)) as u32);
var.encode_bytes(out)?;
Ok(())
}
pub(crate) fn ser_numerical_shared<RustType, ProtoType, W>(
val: RustType,
number: i32,
out: &mut W,
) -> Result<()>
where
ProtoType: tags::NumericalType<RustType = RustType>,
W: Write,
{
let wire = <ProtoType as tags::NumericalType>::to_wire_type(val)?;
ser_wire_and_number(
match wire {
tags::NumericalWireType::Variant(_) => WireType::Variant,
tags::NumericalWireType::Bits32(_) => WireType::Bits32,
tags::NumericalWireType::Bits64(_) => WireType::Bits64,
},
number,
out,
)?;
match wire {
tags::NumericalWireType::Variant(bits) => {
let var = Variant::new(bits);
var.encode_bytes(out)?;
}
tags::NumericalWireType::Bits32(bits) => {
out.write_all(&bits)?;
}
tags::NumericalWireType::Bits64(bits) => {
out.write_all(&bits)?;
}
}
Ok(())
}
pub(crate) fn ser_bytes_shared<W: Write>(bytes: &[u8], number: i32, out: &mut W) -> Result<()> {
ser_wire_and_number(WireType::LengthDelimited, number, out)?;
Variant::from_i32(bytes.len().try_into()?).encode_bytes(out)?;
out.write_all(bytes)?;
Ok(())
}
fn read_byte<I: Iterator<Item = IoResult<u8>>>(bytes: &mut I) -> Result<u8> {
Ok(bytes
.next()
.ok_or(PuroroError::UnexpectedInputTermination)??)
}