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use std::slice;
use std::ops::Deref;
use libc;
use libc::c_void;
use std::fmt;
use libdb_sys::ffi;
pub enum DBT<'a> {
Owned(&'a [u8]),
Ptr(ffi::DBT),
}
impl<'a> DBT<'a> {
pub fn as_slice(&self) -> &[u8] {
match self {
&DBT::Owned(s) => s,
&DBT::Ptr(ptr) => unsafe { slice::from_raw_parts(ptr.data as *const u8, ptr.size as usize) }
}
}
}
impl<'a> fmt::Debug for DBT<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.as_slice())
}
}
impl<'a> Drop for DBT<'a> {
fn drop(&mut self) {
if let &mut DBT::Ptr(ptr) = self {
unsafe { libc::free(ptr.data as *mut c_void); }
}
}
}
impl<'a> Deref for DBT<'a> {
type Target = [u8];
fn deref(&self) -> &[u8] {
self.as_slice()
}
}
impl<'a> From<ffi::DBT> for DBT<'a> {
fn from(ptr: ffi::DBT) -> Self {
DBT::Ptr(ptr)
}
}