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Ensure type use for auxdata is repr(C)

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This commit is contained in:
Thom Chiovoloni 2020-04-12 11:17:56 -07:00 committed by Thom Chiovoloni
parent 38aea89809
commit 71b2f5187b
1 changed files with 16 additions and 6 deletions
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22
src/functions.rs
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@ -67,6 +67,7 @@
//! Ok(())
//! }
//! ```
use std::any::TypeId;
use std::os::raw::{c_int, c_void};
use std::panic::{catch_unwind, RefUnwindSafe, UnwindSafe};
use std::ptr;
@ -177,13 +178,16 @@ impl Context<'_> {
/// https://www.sqlite.org/c3ref/get_auxdata.html for a discussion of
/// this feature, or the unit tests of this module for an example.
pub fn set_aux<T: 'static>(&self, arg: c_int, value: T) {
let boxed = Box::into_raw(Box::new((std::any::TypeId::of::<T>(), value)));
let boxed = Box::into_raw(Box::new(AuxData {
id: TypeId::of::<T>(),
value,
}));
unsafe {
ffi::sqlite3_set_auxdata(
self.ctx,
arg,
boxed as *mut c_void,
Some(free_boxed_value::<(std::any::TypeId, T)>),
Some(free_boxed_value::<AuxData<T>>),
)
};
}
@ -192,20 +196,26 @@ impl Context<'_> {
/// via `set_aux`. Returns `Ok(None)` if no data has been associated,
/// and .
pub fn get_aux<T: 'static>(&self, arg: c_int) -> Result<Option<&T>> {
let p = unsafe { ffi::sqlite3_get_auxdata(self.ctx, arg) as *mut (std::any::TypeId, T) };
let p = unsafe { ffi::sqlite3_get_auxdata(self.ctx, arg) as *const AuxData<T> };
if p.is_null() {
Ok(None)
} else {
let id_val = unsafe { &*p };
if std::any::TypeId::of::<T>() != id_val.0 {
let id = unsafe { (*p).id };
if TypeId::of::<T>() != id {
Err(Error::GetAuxWrongType)
} else {
Ok(Some(&id_val.1))
Ok(Some(unsafe { &(*p).value }))
}
}
}
}
#[repr(C)]
struct AuxData<T: 'static> {
id: TypeId,
value: T,
}
/// `feature = "functions"` Aggregate is the callback interface for user-defined
/// aggregate function.
///