use core::convert::TryFrom;
use serde::de::{self, DeserializeSeed, EnumAccess, MapAccess, SeqAccess, Visitor};
use static_assertions::assert_impl_all;
use std::{marker::PhantomData, str};
#[cfg(unix)]
use std::os::unix::io::RawFd;
use crate::{
de::ValueParseStage, signature_parser::SignatureParser, utils::*, Basic, EncodingContext,
EncodingFormat, Error, ObjectPath, Result, Signature,
};
#[cfg(unix)]
use crate::Fd;
#[derive(Debug)]
pub struct Deserializer<'de, 'sig, 'f, B>(pub(crate) crate::DeserializerCommon<'de, 'sig, 'f, B>);
assert_impl_all!(Deserializer<'_, '_, '_, i32>: Send, Sync, Unpin);
impl<'de, 'sig, 'f, B> Deserializer<'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
pub fn new<'r: 'de>(
bytes: &'r [u8],
#[cfg(unix)] fds: Option<&'f [RawFd]>,
signature: &Signature<'sig>,
ctxt: EncodingContext<B>,
) -> Self {
assert_eq!(ctxt.format(), EncodingFormat::DBus);
let sig_parser = SignatureParser::new(signature.clone());
Self(crate::DeserializerCommon {
ctxt,
sig_parser,
bytes,
#[cfg(unix)]
fds,
#[cfg(not(unix))]
fds: PhantomData,
pos: 0,
container_depths: Default::default(),
b: PhantomData,
})
}
}
macro_rules! deserialize_basic {
($method:ident $read_method:ident $visitor_method:ident($type:ty)) => {
fn $method<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::$read_method(self.0.next_const_size_slice::<$type>()?);
visitor.$visitor_method(v)
}
};
}
macro_rules! deserialize_as {
($method:ident => $as:ident) => {
deserialize_as!($method() => $as());
};
($method:ident($($in_arg:ident: $type:ty),*) => $as:ident($($as_arg:expr),*)) => {
#[inline]
fn $method<V>(self, $($in_arg: $type,)* visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.$as($($as_arg,)* visitor)
}
}
}
impl<'de, 'd, 'sig, 'f, B> de::Deserializer<'de> for &'d mut Deserializer<'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let c = self.0.sig_parser.next_char()?;
crate::de::deserialize_any::<Self, V>(self, c, visitor)
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_u32(self.0.next_const_size_slice::<bool>()?);
let b = match v {
1 => true,
0 => false,
_ => {
return Err(de::Error::invalid_value(
de::Unexpected::Unsigned(v as u64),
&"0 or 1",
))
}
};
visitor.visit_bool(b)
}
fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_i16(visitor)
}
deserialize_basic!(deserialize_i16 read_i16 visit_i16(i16));
deserialize_basic!(deserialize_i64 read_i64 visit_i64(i64));
deserialize_basic!(deserialize_u16 read_u16 visit_u16(u16));
deserialize_basic!(deserialize_u32 read_u32 visit_u32(u32));
deserialize_basic!(deserialize_u64 read_u64 visit_u64(u64));
deserialize_basic!(deserialize_f64 read_f64 visit_f64(f64));
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let bytes = deserialize_ay(self)?;
visitor.visit_byte_buf(bytes.into())
}
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let bytes = deserialize_ay(self)?;
visitor.visit_borrowed_bytes(bytes)
}
deserialize_as!(deserialize_char => deserialize_str);
deserialize_as!(deserialize_string => deserialize_str);
deserialize_as!(deserialize_tuple(_l: usize) => deserialize_struct("", &[]));
deserialize_as!(deserialize_tuple_struct(n: &'static str, _l: usize) => deserialize_struct(n, &[]));
deserialize_as!(deserialize_struct(_n: &'static str, _f: &'static [&'static str]) => deserialize_seq());
deserialize_as!(deserialize_map => deserialize_seq);
deserialize_as!(deserialize_ignored_any => deserialize_any);
fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = match self.0.sig_parser.next_char()? {
#[cfg(unix)]
Fd::SIGNATURE_CHAR => {
self.0.sig_parser.skip_char()?;
let alignment = u32::alignment(EncodingFormat::DBus);
self.0.parse_padding(alignment)?;
let idx = B::read_u32(self.0.next_slice(alignment)?);
self.0.get_fd(idx)?
}
_ => B::read_i32(self.0.next_const_size_slice::<i32>()?),
};
visitor.visit_i32(v)
}
fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_u8(self.0.next_const_size_slice::<u8>().map(|bytes| bytes[0])?)
}
fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_f64(self.0.next_const_size_slice::<f64>()?);
visitor.visit_f32(f64_to_f32(v))
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let len = match self.0.sig_parser.next_char()? {
Signature::SIGNATURE_CHAR | VARIANT_SIGNATURE_CHAR => {
let len_slice = self.0.next_slice(1)?;
len_slice[0] as usize
}
<&str>::SIGNATURE_CHAR | ObjectPath::SIGNATURE_CHAR => {
let alignment = u32::alignment(EncodingFormat::DBus);
self.0.parse_padding(alignment)?;
let len_slice = self.0.next_slice(alignment)?;
B::read_u32(len_slice) as usize
}
c => {
let expected = format!(
"`{}`, `{}`, `{}` or `{}`",
<&str>::SIGNATURE_STR,
Signature::SIGNATURE_STR,
ObjectPath::SIGNATURE_STR,
VARIANT_SIGNATURE_CHAR,
);
return Err(de::Error::invalid_type(
de::Unexpected::Char(c),
&expected.as_str(),
));
}
};
let slice = self.0.next_slice(len)?;
if slice.contains(&0) {
return Err(serde::de::Error::invalid_value(
serde::de::Unexpected::Char('\0'),
&"D-Bus string type must not contain interior null bytes",
));
}
self.0.pos += 1; let s = str::from_utf8(slice).map_err(Error::Utf8)?;
self.0.sig_parser.skip_char()?;
visitor.visit_borrowed_str(s)
}
fn deserialize_option<V>(self, _visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
Err(de::Error::custom(
"D-Bus format does not support optional values",
))
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_unit()
}
fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_unit()
}
fn deserialize_newtype_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
match self.0.sig_parser.next_char()? {
VARIANT_SIGNATURE_CHAR => {
let value_de = ValueDeserializer::new(self);
visitor.visit_seq(value_de)
}
ARRAY_SIGNATURE_CHAR => {
self.0.sig_parser.skip_char()?;
let next_signature_char = self.0.sig_parser.next_char()?;
let array_de = ArrayDeserializer::new(self)?;
if next_signature_char == DICT_ENTRY_SIG_START_CHAR {
visitor.visit_map(ArrayMapDeserializer(array_de))
} else {
visitor.visit_seq(ArraySeqDeserializer(array_de))
}
}
STRUCT_SIG_START_CHAR => {
let signature = self.0.sig_parser.next_signature()?;
let alignment = alignment_for_signature(&signature, EncodingFormat::DBus)?;
self.0.parse_padding(alignment)?;
self.0.sig_parser.skip_char()?;
self.0.container_depths = self.0.container_depths.inc_structure()?;
let v = visitor.visit_seq(StructureDeserializer { de: self });
self.0.container_depths = self.0.container_depths.dec_structure();
v
}
u8::SIGNATURE_CHAR => {
let _: u8 = serde::Deserialize::deserialize(&mut *self)?;
visitor.visit_seq(StructureDeserializer { de: self })
}
c => Err(de::Error::invalid_type(
de::Unexpected::Char(c),
&format!(
"`{VARIANT_SIGNATURE_CHAR}`, `{ARRAY_SIGNATURE_CHAR}` or `{STRUCT_SIG_START_CHAR}`",
)
.as_str(),
)),
}
}
fn deserialize_enum<V>(
self,
name: &'static str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value>
where
V: Visitor<'de>,
{
let signature = self.0.sig_parser.next_signature()?;
let alignment = alignment_for_signature(&signature, self.0.ctxt.format())?;
self.0.parse_padding(alignment)?;
let non_unit = if self.0.sig_parser.next_char()? == STRUCT_SIG_START_CHAR {
self.0.sig_parser.skip_char()?;
true
} else {
false
};
let v = visitor.visit_enum(crate::de::Enum {
de: &mut *self,
name,
phantom: PhantomData,
})?;
if non_unit {
self.0.sig_parser.skip_char()?;
}
Ok(v)
}
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
if self.0.sig_parser.next_char()? == <&str>::SIGNATURE_CHAR {
self.deserialize_str(visitor)
} else {
self.deserialize_u32(visitor)
}
}
fn is_human_readable(&self) -> bool {
false
}
}
struct ArrayDeserializer<'d, 'de, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
len: usize,
start: usize,
element_alignment: usize,
element_signature_len: usize,
}
impl<'d, 'de, 'sig, 'f, B> ArrayDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
fn new(de: &'d mut Deserializer<'de, 'sig, 'f, B>) -> Result<Self> {
de.0.parse_padding(ARRAY_ALIGNMENT_DBUS)?;
de.0.container_depths = de.0.container_depths.inc_array()?;
let len = B::read_u32(de.0.next_slice(4)?) as usize;
let element_signature = de.0.sig_parser.next_signature()?;
let element_alignment = alignment_for_signature(&element_signature, EncodingFormat::DBus)?;
let mut element_signature_len = element_signature.len();
de.0.parse_padding(element_alignment)?;
let start = de.0.pos;
if de.0.sig_parser.next_char()? == DICT_ENTRY_SIG_START_CHAR {
de.0.sig_parser.skip_char()?;
element_signature_len -= 1;
}
Ok(Self {
de,
len,
start,
element_alignment,
element_signature_len,
})
}
fn next<T>(&mut self, seed: T, sig_parser: SignatureParser<'_>) -> Result<T::Value>
where
T: DeserializeSeed<'de>,
{
let ctxt = EncodingContext::new_dbus(self.de.0.ctxt.position() + self.de.0.pos);
let mut de = Deserializer::<B>(crate::DeserializerCommon {
ctxt,
sig_parser,
bytes: subslice(self.de.0.bytes, self.de.0.pos..)?,
fds: self.de.0.fds,
pos: 0,
container_depths: self.de.0.container_depths,
b: PhantomData,
});
let v = seed.deserialize(&mut de);
self.de.0.pos += de.0.pos;
if self.de.0.pos > self.start + self.len {
return Err(serde::de::Error::invalid_length(
self.len,
&format!(">= {}", self.de.0.pos - self.start).as_str(),
));
}
v
}
fn next_element<T>(
&mut self,
seed: T,
sig_parser: SignatureParser<'_>,
) -> Result<Option<T::Value>>
where
T: DeserializeSeed<'de>,
{
if self.done() {
self.de
.0
.sig_parser
.skip_chars(self.element_signature_len)?;
self.de.0.container_depths = self.de.0.container_depths.dec_array();
return Ok(None);
}
self.de.0.parse_padding(self.element_alignment)?;
self.next(seed, sig_parser).map(Some)
}
fn done(&self) -> bool {
self.de.0.pos == self.start + self.len
}
}
fn deserialize_ay<'de, B>(de: &mut Deserializer<'de, '_, '_, B>) -> Result<&'de [u8]>
where
B: byteorder::ByteOrder,
{
if de.0.sig_parser.next_signature()? != "ay" {
return Err(de::Error::invalid_type(de::Unexpected::Seq, &"ay"));
}
de.0.sig_parser.skip_char()?;
let ad = ArrayDeserializer::new(de)?;
let len = ad.len;
de.0.sig_parser.skip_char()?;
de.0.next_slice(len)
}
struct ArraySeqDeserializer<'d, 'de, 'sig, 'f, B>(ArrayDeserializer<'d, 'de, 'sig, 'f, B>);
impl<'d, 'de, 'sig, 'f, B> SeqAccess<'de> for ArraySeqDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>
where
T: DeserializeSeed<'de>,
{
let sig_parser = self.0.de.0.sig_parser.clone();
self.0.next_element(seed, sig_parser)
}
}
struct ArrayMapDeserializer<'d, 'de, 'sig, 'f, B>(ArrayDeserializer<'d, 'de, 'sig, 'f, B>);
impl<'d, 'de, 'sig, 'f, B> MapAccess<'de> for ArrayMapDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>>
where
K: DeserializeSeed<'de>,
{
let sig_parser = self.0.de.0.sig_parser.clone();
self.0.next_element(seed, sig_parser)
}
fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value>
where
V: DeserializeSeed<'de>,
{
let mut sig_parser = self.0.de.0.sig_parser.clone();
sig_parser.skip_char()?;
self.0.next(seed, sig_parser)
}
}
#[derive(Debug)]
struct StructureDeserializer<'d, 'de, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
}
impl<'d, 'de, 'sig, 'f, B> SeqAccess<'de> for StructureDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>
where
T: DeserializeSeed<'de>,
{
let v = seed.deserialize(&mut *self.de).map(Some);
if self.de.0.sig_parser.next_char()? == STRUCT_SIG_END_CHAR {
self.de.0.sig_parser.skip_char()?;
}
v
}
}
#[derive(Debug)]
struct ValueDeserializer<'d, 'de, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
stage: ValueParseStage,
sig_start: usize,
}
impl<'d, 'de, 'sig, 'f, B> ValueDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
fn new(de: &'d mut Deserializer<'de, 'sig, 'f, B>) -> Self {
let sig_start = de.0.pos;
ValueDeserializer::<B> {
de,
stage: ValueParseStage::Signature,
sig_start,
}
}
}
impl<'d, 'de, 'sig, 'f, B> SeqAccess<'de> for ValueDeserializer<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>
where
T: DeserializeSeed<'de>,
{
match self.stage {
ValueParseStage::Signature => {
self.stage = ValueParseStage::Value;
seed.deserialize(&mut *self.de).map(Some)
}
ValueParseStage::Value => {
self.stage = ValueParseStage::Done;
let sig_len = self.de.0.bytes[self.sig_start] as usize;
let sig_start = self.sig_start + 1;
let sig_end = sig_start + sig_len;
let value_start = sig_end + 1;
let slice = subslice(self.de.0.bytes, sig_start..sig_end)?;
let signature = Signature::try_from(slice)?;
let sig_parser = SignatureParser::new(signature);
let ctxt = EncodingContext::new(
EncodingFormat::DBus,
self.de.0.ctxt.position() + value_start,
);
let mut de = Deserializer::<B>(crate::DeserializerCommon {
ctxt,
sig_parser,
bytes: subslice(self.de.0.bytes, value_start..)?,
fds: self.de.0.fds,
pos: 0,
container_depths: self.de.0.container_depths.inc_variant()?,
b: PhantomData,
});
let v = seed.deserialize(&mut de).map(Some);
self.de.0.pos += de.0.pos;
v
}
ValueParseStage::Done => Ok(None),
}
}
}
impl<'de, 'd, 'sig, 'f, B> EnumAccess<'de>
for crate::de::Enum<B, &'d mut Deserializer<'de, 'sig, 'f, B>>
where
B: byteorder::ByteOrder,
{
type Error = Error;
type Variant = Self;
fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant)>
where
V: DeserializeSeed<'de>,
{
seed.deserialize(&mut *self.de).map(|v| (v, self))
}
}