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use crate::{
ffi::{ArchivedCString, CStringResolver},
ser::Serializer,
Archive, ArchivePointee, ArchiveUnsized, Archived, ArchivedMetadata, Deserialize,
DeserializeUnsized, Fallible, FixedUsize, Serialize, SerializeUnsized,
};
use core::{alloc::Layout, ptr};
use ptr_meta::Pointee;
use std::alloc;
use std::ffi::{CStr, CString};
impl ArchiveUnsized for CStr {
type Archived = CStr;
type MetadataResolver = ();
#[inline]
unsafe fn resolve_metadata(
&self,
_: usize,
_: Self::MetadataResolver,
out: *mut ArchivedMetadata<Self>,
) {
out.write(to_archived!(ptr_meta::metadata(self) as FixedUsize))
}
}
impl ArchivePointee for CStr {
type ArchivedMetadata = Archived<usize>;
#[inline]
fn pointer_metadata(archived: &Self::ArchivedMetadata) -> <Self as Pointee>::Metadata {
<[u8]>::pointer_metadata(archived)
}
}
impl<S: Serializer + ?Sized> SerializeUnsized<S> for CStr {
#[inline]
fn serialize_unsized(&self, serializer: &mut S) -> Result<usize, S::Error> {
let result = serializer.pos();
serializer.write(self.to_bytes_with_nul())?;
Ok(result)
}
#[inline]
fn serialize_metadata(&self, _: &mut S) -> Result<Self::MetadataResolver, S::Error> {
Ok(())
}
}
impl<D: Fallible + ?Sized> DeserializeUnsized<CStr, D> for <CStr as ArchiveUnsized>::Archived {
#[inline]
unsafe fn deserialize_unsized(
&self,
_: &mut D,
mut alloc: impl FnMut(Layout) -> *mut u8,
) -> Result<*mut (), D::Error> {
let slice = self.to_bytes_with_nul();
let bytes = alloc(Layout::array::<u8>(slice.len()).unwrap());
ptr::copy_nonoverlapping(slice.as_ptr(), bytes, slice.len());
Ok(bytes.cast())
}
#[inline]
fn deserialize_metadata(&self, _: &mut D) -> Result<<CStr as Pointee>::Metadata, D::Error> {
Ok(ptr_meta::metadata(self))
}
}
impl PartialEq<CString> for ArchivedCString {
#[inline]
fn eq(&self, other: &CString) -> bool {
PartialEq::eq(self.as_c_str(), other.as_c_str())
}
}
impl PartialEq<ArchivedCString> for CString {
#[inline]
fn eq(&self, other: &ArchivedCString) -> bool {
PartialEq::eq(other.as_c_str(), self.as_c_str())
}
}
impl Archive for CString {
type Archived = ArchivedCString;
type Resolver = CStringResolver;
#[inline]
unsafe fn resolve(&self, pos: usize, resolver: Self::Resolver, out: *mut Self::Archived) {
ArchivedCString::resolve_from_c_str(self.as_c_str(), pos, resolver, out);
}
}
impl<S: Serializer + ?Sized> Serialize<S> for CString {
#[inline]
fn serialize(&self, serializer: &mut S) -> Result<Self::Resolver, S::Error> {
ArchivedCString::serialize_from_c_str(self.as_c_str(), serializer)
}
}
impl<D: Fallible + ?Sized> Deserialize<CString, D> for Archived<CString>
where
CStr: DeserializeUnsized<CStr, D>,
{
#[inline]
fn deserialize(&self, deserializer: &mut D) -> Result<CString, D::Error> {
unsafe {
let data_address = self
.as_c_str()
.deserialize_unsized(deserializer, |layout| alloc::alloc(layout))?;
let metadata = self.as_c_str().deserialize_metadata(deserializer)?;
let ptr = ptr_meta::from_raw_parts_mut(data_address, metadata);
Ok(Box::<CStr>::from_raw(ptr).into())
}
}
}