use serde::de::{self, DeserializeSeed, VariantAccess, Visitor};
use static_assertions::assert_impl_all;
use std::{marker::PhantomData, str};
#[cfg(unix)]
use std::os::fd::{AsFd, AsRawFd};
#[cfg(feature = "gvariant")]
use crate::gvariant::Deserializer as GVDeserializer;
use crate::{
container_depths::ContainerDepths, dbus::Deserializer as DBusDeserializer, serialized::Context,
signature_parser::SignatureParser, utils::*, Basic, Error, ObjectPath, Result, Signature,
};
#[cfg(unix)]
use crate::Fd;
#[derive(Debug)]
pub(crate) struct DeserializerCommon<'de, 'sig, 'f, F> {
pub(crate) ctxt: Context,
pub(crate) bytes: &'de [u8],
#[cfg(unix)]
pub(crate) fds: Option<&'f [F]>,
#[cfg(not(unix))]
pub(crate) fds: PhantomData<&'f F>,
pub(crate) pos: usize,
pub(crate) sig_parser: SignatureParser<'sig>,
pub(crate) container_depths: ContainerDepths,
}
pub(crate) enum Deserializer<'ser, 'sig, 'f, F> {
DBus(DBusDeserializer<'ser, 'sig, 'f, F>),
#[cfg(feature = "gvariant")]
GVariant(GVDeserializer<'ser, 'sig, 'f, F>),
}
assert_impl_all!(Deserializer<'_, '_, '_, ()>: Send, Sync, Unpin);
#[cfg(unix)]
impl<'de, 'sig, 'f, F> DeserializerCommon<'de, 'sig, 'f, F>
where
F: AsFd,
{
pub fn get_fd(&self, idx: u32) -> Result<i32> {
self.fds
.and_then(|fds| fds.get(idx as usize).map(|fd| fd.as_fd().as_raw_fd()))
.ok_or(Error::UnknownFd)
}
}
impl<'de, 'sig, 'f, F> DeserializerCommon<'de, 'sig, 'f, F> {
pub fn parse_padding(&mut self, alignment: usize) -> Result<usize> {
let padding = padding_for_n_bytes(self.abs_pos(), alignment);
if padding > 0 {
if self.pos + padding > self.bytes.len() {
return Err(serde::de::Error::invalid_length(
self.bytes.len(),
&format!(">= {}", self.pos + padding).as_str(),
));
}
for i in 0..padding {
let byte = self.bytes[self.pos + i];
if byte != 0 {
return Err(Error::PaddingNot0(byte));
}
}
self.pos += padding;
}
Ok(padding)
}
pub fn prep_deserialize_basic<T>(&mut self) -> Result<()>
where
T: Basic,
{
self.sig_parser.skip_char()?;
self.parse_padding(T::alignment(self.ctxt.format()))?;
Ok(())
}
pub fn next_slice(&mut self, len: usize) -> Result<&'de [u8]> {
if self.pos + len > self.bytes.len() {
return Err(serde::de::Error::invalid_length(
self.bytes.len(),
&format!(">= {}", self.pos + len).as_str(),
));
}
let slice = &self.bytes[self.pos..self.pos + len];
self.pos += len;
Ok(slice)
}
pub fn next_const_size_slice<T>(&mut self) -> Result<&[u8]>
where
T: Basic,
{
self.prep_deserialize_basic::<T>()?;
self.next_slice(T::alignment(self.ctxt.format()))
}
pub fn abs_pos(&self) -> usize {
self.ctxt.position() + self.pos
}
}
macro_rules! deserialize_method {
($method:ident($($arg:ident: $type:ty),*)) => {
#[inline]
fn $method<V>(self, $($arg: $type,)* visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
match self {
#[cfg(feature = "gvariant")]
Deserializer::GVariant(de) => {
de.$method($($arg,)* visitor)
}
Deserializer::DBus(de) => {
de.$method($($arg,)* visitor)
}
}
}
}
}
impl<'de, 'd, 'sig, 'f, #[cfg(unix)] F: AsFd, #[cfg(not(unix))] F> de::Deserializer<'de>
for &'d mut Deserializer<'de, 'sig, 'f, F>
{
type Error = Error;
deserialize_method!(deserialize_any());
deserialize_method!(deserialize_bool());
deserialize_method!(deserialize_i8());
deserialize_method!(deserialize_i16());
deserialize_method!(deserialize_i32());
deserialize_method!(deserialize_i64());
deserialize_method!(deserialize_u8());
deserialize_method!(deserialize_u16());
deserialize_method!(deserialize_u32());
deserialize_method!(deserialize_u64());
deserialize_method!(deserialize_f32());
deserialize_method!(deserialize_f64());
deserialize_method!(deserialize_char());
deserialize_method!(deserialize_str());
deserialize_method!(deserialize_string());
deserialize_method!(deserialize_bytes());
deserialize_method!(deserialize_byte_buf());
deserialize_method!(deserialize_option());
deserialize_method!(deserialize_unit());
deserialize_method!(deserialize_unit_struct(n: &'static str));
deserialize_method!(deserialize_newtype_struct(n: &'static str));
deserialize_method!(deserialize_seq());
deserialize_method!(deserialize_map());
deserialize_method!(deserialize_tuple(n: usize));
deserialize_method!(deserialize_tuple_struct(n: &'static str, l: usize));
deserialize_method!(deserialize_struct(
n: &'static str,
f: &'static [&'static str]
));
deserialize_method!(deserialize_enum(
n: &'static str,
f: &'static [&'static str]
));
deserialize_method!(deserialize_identifier());
deserialize_method!(deserialize_ignored_any());
fn is_human_readable(&self) -> bool {
false
}
}
#[derive(Debug)]
pub(crate) enum ValueParseStage {
Signature,
Value,
Done,
}
pub(crate) fn deserialize_any<'de, 'sig, 'f, D, V>(
de: D,
next_char: char,
visitor: V,
) -> Result<V::Value>
where
D: de::Deserializer<'de, Error = Error>,
V: Visitor<'de>,
{
match next_char {
u8::SIGNATURE_CHAR => de.deserialize_u8(visitor),
bool::SIGNATURE_CHAR => de.deserialize_bool(visitor),
i16::SIGNATURE_CHAR => de.deserialize_i16(visitor),
u16::SIGNATURE_CHAR => de.deserialize_u16(visitor),
i32::SIGNATURE_CHAR => de.deserialize_i32(visitor),
#[cfg(unix)]
Fd::SIGNATURE_CHAR => de.deserialize_i32(visitor),
u32::SIGNATURE_CHAR => de.deserialize_u32(visitor),
i64::SIGNATURE_CHAR => de.deserialize_i64(visitor),
u64::SIGNATURE_CHAR => de.deserialize_u64(visitor),
f64::SIGNATURE_CHAR => de.deserialize_f64(visitor),
<&str>::SIGNATURE_CHAR | ObjectPath::SIGNATURE_CHAR | Signature::SIGNATURE_CHAR => {
de.deserialize_str(visitor)
}
VARIANT_SIGNATURE_CHAR => de.deserialize_seq(visitor),
ARRAY_SIGNATURE_CHAR => de.deserialize_seq(visitor),
STRUCT_SIG_START_CHAR => de.deserialize_seq(visitor),
#[cfg(feature = "gvariant")]
MAYBE_SIGNATURE_CHAR => de.deserialize_option(visitor),
c => Err(de::Error::invalid_value(
de::Unexpected::Char(c),
&"a valid signature character",
)),
}
}
pub(crate) struct Enum<D, F> {
pub(crate) de: D,
pub(crate) name: &'static str,
pub(crate) _phantom: PhantomData<F>,
}
impl<'de, D, F> VariantAccess<'de> for Enum<D, F>
where
D: de::Deserializer<'de, Error = Error>,
{
type Error = Error;
fn unit_variant(self) -> std::result::Result<(), Self::Error> {
Ok(())
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value>
where
T: DeserializeSeed<'de>,
{
seed.deserialize(self.de)
}
fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
de::Deserializer::deserialize_struct(self.de, self.name, &[], visitor)
}
fn struct_variant<V>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
de::Deserializer::deserialize_struct(self.de, self.name, fields, visitor)
}
}