1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
use super::{Result, SlimError};
use std::result;
use std::io::prelude::*;
use std::io::ErrorKind;
use byteorder::BigEndian;
use byteorder::ByteOrder;
use std::vec;
use std::str;
fn fill_buf<R: Read>(s: &mut R, buf: &mut [u8]) -> Result<()> {
match s.read_exact(buf) {
Err(e) => {
match e.kind() {
ErrorKind::UnexpectedEof => return Err(SlimError::StreamClosed),
_ => return Err(SlimError::StreamError),
}
}
_ => Ok(()),
}
}
macro_rules! deser_int {
($a:ty, $b:expr, $c:path)=> {
impl<R: Read> Deserialize<R> for $a {
fn decode_stream(s: &mut R) -> Result<$a> {
let mut buf: [u8; $b] = [0; $b];
try!(fill_buf(s, &mut buf));
Ok($c(&buf))
}
}
}
}
deser_int!(u64, 8, BigEndian::read_u64);
deser_int!(u32, 4, BigEndian::read_u32);
deser_int!(u16, 2, BigEndian::read_u16);
deser_int!(i64, 8, BigEndian::read_i64);
deser_int!(i32, 4, BigEndian::read_i32);
deser_int!(i16, 2, BigEndian::read_i16);
deser_int!(f64, 8, BigEndian::read_f64);
deser_int!(f32, 4, BigEndian::read_f32);
impl<R: Read> Deserialize<R> for u8 {
fn decode_stream(s: &mut R) -> Result<u8> {
let mut buf: [u8; 1] = [0; 1];
try!(fill_buf(s, &mut buf));
Ok(buf[0])
}
}
impl<R: Read> Deserialize<R> for i8 {
fn decode_stream(s: &mut R) -> Result<i8> {
let j = try!(u8::decode_stream(s));
Ok(j as i8)
}
}
impl<R: Read> Deserialize<R> for bool {
fn decode_stream(s: &mut R) -> Result<bool> {
let j = try!(u8::decode_stream(s));
Ok(j != 0)
}
}
pub trait Deserialize<R> {
fn decode_stream(r: &mut R) -> Result<Self>
where Self: Sized,
R: Read;
}
impl<R: Read> Deserialize<R> for () {
fn decode_stream(_: &mut R) -> Result<()> {
Ok(())
}
}
impl<R: Read, T: Deserialize<R>, E: Deserialize<R>> Deserialize<R> for result::Result<T, E> {
fn decode_stream(s: &mut R) -> Result<result::Result<T, E>> {
let typebuf = try!(u8::decode_stream(s));
match typebuf {
0 => {
if let Ok(x) = T::decode_stream(s) {
return Ok(Ok(x));
}
}
1 => {
if let Ok(t) = E::decode_stream(s) {
return Ok(Err(t));
}
}
_ => (),
}
return Err(SlimError::DeserializationError);
}
}
use std::borrow::Cow;
impl<'a, R: Read, T: Deserialize<R> + Clone> Deserialize<R> for Cow<'a, T> {
fn decode_stream(s: &mut R) -> Result<Cow<'a, T>> {
Ok(Cow::Owned(try!(T::decode_stream(s))))
}
}
impl<'a, R: Read> Deserialize<R> for Cow<'a, str> {
fn decode_stream(s: &mut R) -> Result<Cow<'a, str>> {
let size = try!(u64::decode_stream(s)) as usize;
let mut buf = vec::Vec::new();
buf.resize(size, 0);
try!(fill_buf(s, buf.as_mut_slice()));
match str::from_utf8(buf.as_slice()) {
Ok(s) => Ok(Cow::Owned(s.to_string())),
Err(_) => Err(SlimError::DeserializationError),
}
}
}
impl<R: Read> Deserialize<R> for String {
fn decode_stream(s: &mut R) -> Result<String> {
let size = try!(u64::decode_stream(s)) as usize;
let mut buf = vec::Vec::new();
buf.resize(size, 0);
try!(fill_buf(s, buf.as_mut_slice()));
match str::from_utf8(buf.as_slice()) {
Ok(s) => Ok(s.to_string()),
Err(_) => Err(SlimError::DeserializationError),
}
}
}
impl<R: Read, T> Deserialize<R> for vec::Vec<T>
where T: Deserialize<R>
{
fn decode_stream(s: &mut R) -> Result<vec::Vec<T>> {
let size = try!(u64::decode_stream(s)) as usize;
let mut buf = vec::Vec::new();
buf.reserve(size);
for _ in 0..size {
buf.push(try!(T::decode_stream(s)));
}
Ok(buf)
}
}
impl<R: Read, T: Deserialize<R>> Deserialize<R> for Option<T> {
fn decode_stream(s: &mut R) -> Result<Option<T>> {
let typebuf = try!(u8::decode_stream(s));
match typebuf {
0 => return Ok(None),
1 => {
if let Ok(t) = T::decode_stream(s) {
return Ok(Some(t));
}
}
_ => (),
}
return Err(SlimError::DeserializationError);
}
}
impl<R: Read, T: Deserialize<R>, E: Deserialize<R>> Deserialize<R> for (T, E) {
fn decode_stream(s: &mut R) -> Result<(T, E)> {
if let Ok(x) = T::decode_stream(s) {
if let Ok(t) = E::decode_stream(s) {
return Ok((x, t));
}
}
Err(SlimError::DeserializationError)
}
}
impl<R: Read> Deserialize<R> for SlimError {
fn decode_stream(s: &mut R) -> Result<SlimError> {
let x = try!(u8::decode_stream(s));
match x {
0 => Ok(SlimError::SerializationError),
1 => Ok(SlimError::DeserializationError),
2 => Ok(SlimError::StreamClosed),
3 => Ok(SlimError::StreamError),
_ => Err(SlimError::DeserializationError),
}
}
}