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use std::convert::Infallible;
use std::error::Error;
use super::{vec::VecMarshaler, FromForeign, InputType, ReturnType, Slice, ToForeign};
pub struct StringMarshaler;
impl InputType for StringMarshaler {
type Foreign = Slice<u8>;
type ForeignTraitObject = ();
}
impl ReturnType for StringMarshaler {
type Foreign = Slice<u8>;
type ForeignTraitObject = ();
#[inline(always)]
fn foreign_default() -> Self::Foreign {
Slice::default()
}
}
impl ToForeign<String, Slice<u8>> for StringMarshaler {
type Error = Infallible;
#[inline(always)]
fn to_foreign(string: String) -> Result<Slice<u8>, Self::Error> {
VecMarshaler::to_foreign(string.into_bytes())
}
}
impl ToForeign<Result<String, Box<dyn Error>>, Slice<u8>> for StringMarshaler {
type Error = Box<dyn Error>;
#[inline(always)]
fn to_foreign(result: Result<String, Box<dyn Error>>) -> Result<Slice<u8>, Self::Error> {
result.and_then(|v| Ok(StringMarshaler::to_foreign(v).unwrap()))
}
}
impl ToForeign<Option<String>, Slice<u8>> for StringMarshaler {
type Error = Box<dyn Error>;
#[inline(always)]
fn to_foreign(option: Option<String>) -> Result<Slice<u8>, Self::Error> {
match option {
None => Ok(Slice::default()),
Some(v) => Ok(StringMarshaler::to_foreign(v).unwrap()),
}
}
}
impl<'a> FromForeign<Slice<u8>, String> for StringMarshaler {
type Error = Box<dyn Error>;
#[inline(always)]
unsafe fn from_foreign(key: Slice<u8>) -> Result<String, Self::Error> {
VecMarshaler::from_foreign(key)
.and_then(|vec| String::from_utf8(vec).map_err(|err| Box::new(err) as _))
}
}
#[no_mangle]
pub unsafe extern "C" fn cffi_string_free(slice: Slice<u8>) {
crate::vec::cffi_vec_free(slice.cast());
}