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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
use anyhow::Context;
use std::io::{Read, Write};
pub trait Sink {
fn put<V: Ser>(&mut self, value: V) -> anyhow::Result<()>;
}
pub trait Source {
fn get<V: Ser>(&mut self) -> anyhow::Result<V>;
}
impl<T: Write> Sink for T {
fn put<V: Ser>(&mut self, value: V) -> anyhow::Result<()> {
value.write(self)
}
}
impl<T: Read> Source for T {
fn get<V: Ser>(&mut self) -> anyhow::Result<V> {
V::read(self)
}
}
pub trait Ser: Sized {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()>;
fn read(source: &mut impl Read) -> anyhow::Result<Self>;
}
impl<A: Ser, B: Ser> Ser for (A, B) {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.0.write(sink).context("first tuple field")?;
self.1.write(sink).context("second tuple field")?;
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
Ok((A::read(source)?, B::read(source)?))
}
}
impl<A: Ser, B: Ser, C: Ser> Ser for (A, B, C) {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.0.write(sink).context("first tuple field")?;
self.1.write(sink).context("second tuple field")?;
self.2.write(sink).context("third tuple field")?;
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
Ok((A::read(source)?, B::read(source)?, C::read(source)?))
}
}
impl<A: Ser, const N: usize> Ser for [A; N] {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
for e in self {
e.write(sink).context("some array")?;
}
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut k: [A; N] = unsafe { std::mem::zeroed() };
for i in 0..N {
k[i] = A::read(source)?;
}
Ok(k)
}
}
impl<T: Ser> Ser for Vec<T> {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.len().write(sink)?;
for e in self {
e.write(sink).context("some vec")?;
}
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut v = vec![];
for _ in 0..usize::read(source)? {
v.push(T::read(source)?)
}
Ok(v)
}
}
impl Ser for u8 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink.write_all(&[*self]).context("write u8")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 1];
source.read_exact(&mut buf)?;
Ok(buf[0])
}
}
impl Ser for u16 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 2]>(self) })
.context("write 16")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 2];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u32 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
.context("write u32")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u64 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write u64")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for usize {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write usize")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for isize {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write isize")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f32 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
.context("write f32")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f64 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write f64")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
#[cfg(test)]
mod test {
use super::{Ser, Sink};
use crate::header::Header;
use crate::ser::Source;
use crate::vec2::Vec2;
use std::fmt::Debug;
use std::io::Cursor;
fn test_ser<T: PartialEq + Ser + Debug + Clone>(value: T) {
let mut buf = vec![];
Cursor::new(&mut buf).put(value.clone()).unwrap();
assert_eq!(value, Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn simple() {
let mut buf = vec![];
Cursor::new(&mut buf).put(10usize).unwrap();
assert_eq!(10usize, Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn tuple() {
let mut buf = vec![];
Cursor::new(&mut buf).put((10usize, 5u8, 3u16)).unwrap();
assert_eq!((10usize, 5u8, 3u16), Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn header() {
test_ser(Header {
frame_count: 123,
resolution: Vec2 { x: 13, y: 37 },
});
}
#[test]
fn vec() {
test_ser(vec![1u16, 2, 3, 4]);
}
#[test]
fn array() {
test_ser([1u16, 2, 3, 4]);
}
}
|
