use core::convert::TryFrom;
use serde::de::{self, DeserializeSeed, EnumAccess, MapAccess, SeqAccess, VariantAccess, Visitor};
use serde::Deserialize;
use std::os::unix::io::RawFd;
use std::{marker::PhantomData, str};
use crate::signature_parser::SignatureParser;
use crate::utils::*;
use crate::Type;
use crate::{Basic, EncodingContext};
use crate::{Error, Result};
use crate::{Fd, ObjectPath, Signature};
pub fn from_slice_fds<'d, 'r: 'd, B, T: ?Sized>(
bytes: &'r [u8],
fds: Option<&[RawFd]>,
ctxt: EncodingContext<B>,
) -> Result<T>
where
B: byteorder::ByteOrder,
T: Deserialize<'d> + Type,
{
let signature = T::signature();
from_slice_fds_for_signature(bytes, fds, ctxt, &signature)
}
pub fn from_slice<'d, 'r: 'd, B, T: ?Sized>(bytes: &'r [u8], ctxt: EncodingContext<B>) -> Result<T>
where
B: byteorder::ByteOrder,
T: Deserialize<'d> + Type,
{
let signature = T::signature();
from_slice_for_signature(bytes, ctxt, &signature)
}
pub fn from_slice_for_signature<'d, 'r: 'd, B, T: ?Sized>(
bytes: &'r [u8],
ctxt: EncodingContext<B>,
signature: &Signature,
) -> Result<T>
where
B: byteorder::ByteOrder,
T: Deserialize<'d>,
{
from_slice_fds_for_signature(bytes, None, ctxt, signature)
}
pub fn from_slice_fds_for_signature<'d, 'r: 'd, B, T: ?Sized>(
bytes: &'r [u8],
fds: Option<&[RawFd]>,
ctxt: EncodingContext<B>,
signature: &Signature,
) -> Result<T>
where
B: byteorder::ByteOrder,
T: Deserialize<'d>,
{
let mut de = Deserializer::new(bytes, fds, signature, ctxt);
T::deserialize(&mut de)
}
pub struct Deserializer<'de, 'sig, 'f, B> {
pub(self) ctxt: EncodingContext<B>,
pub(self) bytes: &'de [u8],
pub(self) fds: Option<&'f [RawFd]>,
pub(self) pos: usize,
pub(self) sign_parser: SignatureParser<'sig>,
b: PhantomData<B>,
}
impl<'de, 'sig, 'f, B> Deserializer<'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
pub fn new<'r: 'de>(
bytes: &'r [u8],
fds: Option<&'f [RawFd]>,
signature: &Signature<'sig>,
ctxt: EncodingContext<B>,
) -> Self {
let sign_parser = SignatureParser::new(signature.clone());
Self {
ctxt,
sign_parser,
bytes,
fds,
pos: 0,
b: PhantomData,
}
}
fn get_fd(&self, idx: u32) -> Result<i32> {
self.fds
.map(|fds| fds.get(idx as usize))
.flatten()
.copied()
.ok_or(Error::UnknownFd)
}
fn parse_padding(&mut self, alignment: usize) -> Result<usize> {
let padding = padding_for_n_bytes(self.abs_pos(), alignment);
if padding > 0 {
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)
}
fn prep_deserialize_basic<T>(&mut self) -> Result<()>
where
T: Basic,
{
self.sign_parser.parse_char(Some(T::SIGNATURE_CHAR))?;
self.parse_padding(T::ALIGNMENT)?;
Ok(())
}
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)
}
fn next_const_size_slice<T>(&mut self) -> Result<&[u8]>
where
T: Basic,
{
self.prep_deserialize_basic::<T>()?;
self.next_slice(T::ALIGNMENT)
}
fn abs_pos(&self) -> usize {
self.ctxt.position() + self.pos
}
}
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>,
{
match self.sign_parser.next_char()? {
u8::SIGNATURE_CHAR => self.deserialize_u8(visitor),
bool::SIGNATURE_CHAR => self.deserialize_bool(visitor),
i16::SIGNATURE_CHAR => self.deserialize_i16(visitor),
u16::SIGNATURE_CHAR => self.deserialize_u16(visitor),
i32::SIGNATURE_CHAR | Fd::SIGNATURE_CHAR => self.deserialize_i32(visitor),
u32::SIGNATURE_CHAR => self.deserialize_u32(visitor),
i64::SIGNATURE_CHAR => self.deserialize_i64(visitor),
u64::SIGNATURE_CHAR => self.deserialize_u64(visitor),
f64::SIGNATURE_CHAR => self.deserialize_f64(visitor),
<&str>::SIGNATURE_CHAR | ObjectPath::SIGNATURE_CHAR | Signature::SIGNATURE_CHAR => {
self.deserialize_str(visitor)
}
VARIANT_SIGNATURE_CHAR => self.deserialize_seq(visitor),
ARRAY_SIGNATURE_CHAR => self.deserialize_seq(visitor),
STRUCT_SIG_START_CHAR => self.deserialize_seq(visitor),
c => Err(de::Error::invalid_value(
de::Unexpected::Char(c),
&"a valid signature character",
)),
}
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_u32(self.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)
}
fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_i16(self.next_const_size_slice::<i16>()?);
visitor.visit_i16(v)
}
fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = match self.sign_parser.next_char()? {
Fd::SIGNATURE_CHAR => {
self.sign_parser.parse_char(None)?;
self.parse_padding(u32::ALIGNMENT)?;
let idx = B::read_u32(self.next_slice(u32::ALIGNMENT)?);
self.get_fd(idx)?
}
_ => B::read_i32(self.next_const_size_slice::<i32>()?),
};
visitor.visit_i32(v)
}
fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_i64(self.next_const_size_slice::<i64>()?);
visitor.visit_i64(v)
}
fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_u8(self.next_const_size_slice::<u8>().map(|bytes| bytes[0])?)
}
fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_u16(self.next_const_size_slice::<u16>()?);
visitor.visit_u16(v)
}
fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_u32(self.next_const_size_slice::<u32>()?);
visitor.visit_u32(v)
}
fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_u64(self.next_const_size_slice::<u64>()?);
visitor.visit_u64(v)
}
fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_f64(self.next_const_size_slice::<f64>()?);
visitor.visit_f32(f64_to_f32(v))
}
fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let v = B::read_f64(self.next_const_size_slice::<f64>()?);
visitor.visit_f64(v)
}
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
let len = match self.sign_parser.next_char()? {
Signature::SIGNATURE_CHAR | VARIANT_SIGNATURE_CHAR => {
let len_slice = self.next_slice(1)?;
len_slice[0] as usize
}
<&str>::SIGNATURE_CHAR | ObjectPath::SIGNATURE_CHAR => {
self.parse_padding(u32::ALIGNMENT)?;
let len_slice = self.next_slice(u32::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(),
));
}
};
self.sign_parser.parse_char(None)?;
let slice = self.next_slice(len)?;
let s = str::from_utf8(slice).map_err(Error::Utf8)?;
self.pos += 1;
visitor.visit_borrowed_str(s)
}
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_option<V>(self, _visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
todo!();
}
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.sign_parser.next_char()? {
VARIANT_SIGNATURE_CHAR => {
let start = self.pos + 1;
let value_de = ValueDeserializer::<B> {
de: self,
stage: ValueParseStage::Signature,
start,
};
visitor.visit_seq(value_de)
}
ARRAY_SIGNATURE_CHAR => {
self.sign_parser.parse_char(Some(ARRAY_SIGNATURE_CHAR))?;
self.parse_padding(ARRAY_ALIGNMENT)?;
let len = B::read_u32(self.next_slice(4)?) as usize;
let next_signature_char = self.sign_parser.next_char()?;
let alignment =
alignment_for_signature_char(next_signature_char, self.ctxt.format());
self.parse_padding(alignment)?;
let start = self.pos;
let element_signature_pos = self.sign_parser.pos();
if next_signature_char == DICT_ENTRY_SIG_START_CHAR {
self.sign_parser
.parse_char(Some(DICT_ENTRY_SIG_START_CHAR))?;
}
let rest_of_signature = Signature::from_str_unchecked(
&self.sign_parser.signature()[element_signature_pos..],
);
let element_signature = slice_signature(&rest_of_signature)?;
if next_signature_char == DICT_ENTRY_SIG_START_CHAR {
let element_signature_len = element_signature.len() - 2;
visitor
.visit_map(ArrayDeserializer {
de: self,
len,
start,
element_signature_len,
})
.and_then(|v| {
self.sign_parser.parse_char(Some(DICT_ENTRY_SIG_END_CHAR))?;
Ok(v)
})
} else {
let element_signature_len = element_signature.len();
visitor.visit_seq(ArrayDeserializer {
de: self,
len,
start,
element_signature_len,
})
}
}
STRUCT_SIG_START_CHAR => {
self.sign_parser.parse_char(Some(STRUCT_SIG_START_CHAR))?;
self.parse_padding(STRUCT_ALIGNMENT)?;
visitor
.visit_seq(StructureDeserializer { de: self })
.and_then(|v| {
self.sign_parser.parse_char(Some(STRUCT_SIG_END_CHAR))?;
Ok(v)
})
}
c => Err(de::Error::invalid_type(
de::Unexpected::Char(c),
&format!(
"`{}`, `{}` or `{}`",
VARIANT_SIGNATURE_CHAR, ARRAY_SIGNATURE_CHAR, STRUCT_SIG_START_CHAR,
)
.as_str(),
)),
}
}
fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_struct("", &[], visitor)
}
fn deserialize_tuple_struct<V>(
self,
name: &'static str,
_len: usize,
visitor: V,
) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_struct(name, &[], visitor)
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_struct<V>(
self,
_name: &'static str,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_enum<V>(
self,
name: &'static str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value>
where
V: Visitor<'de>,
{
visitor.visit_enum(Enum::<B> { de: self, name })
}
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.parse_padding(u32::ALIGNMENT)?;
let variant_index = from_slice_fds::<B, _>(&self.bytes[self.pos..], self.fds, self.ctxt)?;
self.pos += u32::ALIGNMENT;
visitor.visit_u32(variant_index)
}
fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value>
where
V: Visitor<'de>,
{
self.deserialize_any(visitor)
}
}
struct ArrayDeserializer<'d, 'de, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
len: usize,
start: usize,
element_signature_len: usize,
}
impl<'d, 'de, 'sig, 'f, B> SeqAccess<'de> for ArrayDeserializer<'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>,
{
if self.de.pos == self.start + self.len {
if self.len == 0 {
self.de.sign_parser.skip_chars(self.element_signature_len)?;
}
return Ok(None);
}
if self.start != self.de.pos {
self.de.sign_parser.rewind_chars(self.element_signature_len);
}
let v = seed.deserialize(&mut *self.de).map(Some);
if self.de.pos > self.start + self.len {
return Err(serde::de::Error::invalid_length(
self.len,
&format!(">= {}", self.de.pos - self.start).as_str(),
));
}
v
}
}
impl<'d, 'de, 'sig, 'f, B> MapAccess<'de> for ArrayDeserializer<'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>,
{
if self.de.pos == self.start + self.len {
if self.len == 0 {
self.de.sign_parser.skip_chars(self.element_signature_len)?;
}
return Ok(None);
}
if self.start != self.de.pos {
self.de.sign_parser.rewind_chars(self.element_signature_len);
self.de.parse_padding(DICT_ENTRY_ALIGNMENT)?;
}
let v = seed.deserialize(&mut *self.de).map(Some);
if self.de.pos > self.start + self.len {
return Err(serde::de::Error::invalid_length(
self.len,
&format!(">= {}", self.de.pos - self.start).as_str(),
));
}
v
}
fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value>
where
V: DeserializeSeed<'de>,
{
let v = seed.deserialize(&mut *self.de);
if self.de.pos > self.start + self.len {
return Err(serde::de::Error::invalid_length(
self.len,
&format!(">= {}", self.de.pos - self.start).as_str(),
));
}
v
}
}
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>,
{
seed.deserialize(&mut *self.de).map(Some)
}
}
enum ValueParseStage {
Signature,
Value,
Done,
}
struct ValueDeserializer<'d, 'de, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
stage: ValueParseStage,
start: usize,
}
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 slice = &self.de.bytes[self.start..(self.de.pos - 1)];
let signature = str::from_utf8(slice)
.map_err(Error::Utf8)
.and_then(Signature::try_from)?;
let sign_parser = SignatureParser::new(signature);
let mut de = Deserializer::<B> {
ctxt: self.de.ctxt,
sign_parser,
bytes: self.de.bytes,
fds: self.de.fds,
pos: self.de.pos,
b: PhantomData,
};
let v = seed.deserialize(&mut de).map(Some);
self.de.pos = de.pos;
v
}
ValueParseStage::Done => Ok(None),
}
}
}
struct Enum<'d, 'de: 'd, 'sig, 'f, B> {
de: &'d mut Deserializer<'de, 'sig, 'f, B>,
name: &'static str,
}
impl<'de, 'd, 'sig, 'f, B> EnumAccess<'de> for Enum<'d, '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))
}
}
impl<'de, 'd, 'sig, 'f, B> VariantAccess<'de> for Enum<'d, 'de, 'sig, 'f, B>
where
B: byteorder::ByteOrder,
{
type Error = Error;
fn unit_variant(self) -> Result<()> {
self.de.sign_parser.parse_char(Some(u32::SIGNATURE_CHAR))?;
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)
}
}