libdb/
dbt.rs

1use std::slice;
2use std::ops::Deref;
3use libc;
4use libc::c_void;
5use std::fmt;
6
7use libdb_sys::ffi;
8
9pub enum DBT<'a> {
10    Owned(&'a [u8]),
11    Ptr(ffi::DBT),
12}
13
14// impl<'a> DBT<'a> {
15
16//     fn as_bytes(&self) -> [u8] {
17//         *self
18//     }
19// }
20
21impl<'a> DBT<'a> {
22
23    pub fn as_slice(&self) -> &[u8] {
24        match self {
25            &DBT::Owned(s) => s,
26            &DBT::Ptr(ptr) => unsafe { slice::from_raw_parts(ptr.data as *const u8, ptr.size as usize) }
27        }
28    }
29}
30
31impl<'a> fmt::Debug for DBT<'a> {
32    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
33        write!(f, "{:?}", self.as_slice())
34    }
35}
36
37impl<'a> Drop for DBT<'a> {
38    fn drop(&mut self) {
39        if let &mut DBT::Ptr(ptr) = self {
40            unsafe { libc::free(ptr.data as *mut c_void); }
41        }
42    }
43}
44
45impl<'a> Deref for DBT<'a> {
46    type Target = [u8];
47
48    fn deref(&self) -> &[u8] {
49        self.as_slice()
50    }
51}
52
53impl<'a> From<ffi::DBT> for DBT<'a> {
54    fn from(ptr: ffi::DBT) -> Self {
55        DBT::Ptr(ptr)
56    }
57}
58
59
60
61// / A database thang
62// /
63// / 
64// pub struct DBT<'a> {
65//     /// Pointer to the data.
66//     data: *mut u8,
67
68//     // Length of the data.
69//     size: u32,
70
71//     // Length of a user-supplied buffer.
72//     ulen: u32,
73
74//     // dlen and doff are used by BDB for partial reads/updates
75//     dlen: u32,
76//     doff: u32,
77// }
78
79// impl DBT {
80
81//     pub fn from_raw_parts(data: *mut u8, len: u32) -> DBT {
82//         DBT {
83//             data: data,
84//             size: len,
85//             ulen: len,
86//             dlen: 0,
87//             doff: 0,
88//         }
89//     }
90
91//     pub fn len(&self) -> u32 {
92//         self.size
93//     }
94
95//     pub fn as_mut_ptr(&mut self) -> *mut u8 {
96//         self.data
97//     }
98// }
99
100// impl From<&mut [u8]> for DBT {
101//     fn from(data: &mut [u8]) -> Self {
102
103//     }
104// }
105
106// impl Deref for DBT {
107//     type Target = [u8];
108
109//     fn deref(&self) -> &[u8] {
110//         unsafe { slice::from_raw_parts(self.data, self.size as usize) }
111//     }
112// }
113
114// impl Drop for DBT {
115//     fn drop(&mut self) {
116//         unsafe {
117//             libc::free(self.data as *mut c_void);
118//         }
119//     }
120// }
libdb/dbt.rs

libdb/
dbt.rs
