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
use super::ZeroVec;
use crate::ule::*;
use alloc::vec::Vec;
use core::fmt;
use core::marker::PhantomData;
use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
use serde::ser::{Serialize, SerializeSeq, Serializer};
struct ZeroVecVisitor<T> {
marker: PhantomData<fn() -> T>,
}
impl<T> Default for ZeroVecVisitor<T> {
fn default() -> Self {
Self {
marker: PhantomData,
}
}
}
impl<'de, T> Visitor<'de> for ZeroVecVisitor<T>
where
T: 'de + Deserialize<'de> + AsULE,
{
type Value = ZeroVec<'de, T>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a sequence or borrowed buffer of fixed-width elements")
}
fn visit_borrowed_bytes<E>(self, bytes: &'de [u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
ZeroVec::parse_byte_slice(bytes).map_err(de::Error::custom)
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut vec: Vec<T::ULE> = if let Some(capacity) = seq.size_hint() {
Vec::with_capacity(capacity)
} else {
Vec::new()
};
while let Some(value) = seq.next_element::<T>()? {
vec.push(T::as_unaligned(value));
}
Ok(ZeroVec::Owned(vec))
}
}
impl<'de, 'a, T> Deserialize<'de> for ZeroVec<'a, T>
where
T: 'de + Deserialize<'de> + AsULE,
'de: 'a,
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let visitor = ZeroVecVisitor::default();
if deserializer.is_human_readable() {
deserializer.deserialize_seq(visitor)
} else {
deserializer.deserialize_bytes(visitor)
}
}
}
impl<T> Serialize for ZeroVec<'_, T>
where
T: Serialize + AsULE,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if serializer.is_human_readable() {
let mut seq = serializer.serialize_seq(Some(self.len()))?;
for value in self.iter() {
seq.serialize_element(&value)?;
}
seq.end()
} else {
serializer.serialize_bytes(self.as_bytes())
}
}
}
#[cfg(test)]
#[allow(non_camel_case_types)]
mod test {
use super::super::*;
use crate::samples::*;
#[derive(::serde::Serialize, ::serde::Deserialize)]
struct DeriveTest_ZeroVec<'data> {
#[serde(borrow)]
_data: ZeroVec<'data, u16>,
}
#[test]
fn test_serde_json() {
let zerovec_orig = ZeroVec::from_slice(TEST_SLICE);
let json_str = serde_json::to_string(&zerovec_orig).expect("serialize");
assert_eq!(JSON_STR, json_str);
let vec_new: Vec<u32> =
serde_json::from_str(&json_str).expect("deserialize from buffer to Vec");
assert_eq!(zerovec_orig, ZeroVec::<u32>::from_slice(vec_new.as_slice()));
let zerovec_new: ZeroVec<u32> =
serde_json::from_str(&json_str).expect("deserialize from buffer to ZeroVec");
assert_eq!(zerovec_orig, zerovec_new);
assert!(matches!(zerovec_new, ZeroVec::Owned(_)));
}
#[test]
fn test_serde_bincode() {
let zerovec_orig = ZeroVec::from_slice(TEST_SLICE);
let bincode_buf = bincode::serialize(&zerovec_orig).expect("serialize");
assert_eq!(BINCODE_BUF, bincode_buf);
bincode::deserialize::<Vec<u32>>(&bincode_buf).expect_err("deserialize from buffer to Vec");
let zerovec_new: ZeroVec<u32> =
bincode::deserialize(&bincode_buf).expect("deserialize from buffer to ZeroVec");
assert_eq!(zerovec_orig, zerovec_new);
assert!(matches!(zerovec_new, ZeroVec::Borrowed(_)));
}
#[test]
fn test_chars_valid() {
let zerovec_orig = ZeroVec::from_slice(&['w', 'ω', '文', '𑄃']);
let bincode_buf = bincode::serialize(&zerovec_orig).expect("serialize");
let zerovec_new: ZeroVec<char> =
bincode::deserialize(&bincode_buf).expect("deserialize from buffer to ZeroVec");
assert_eq!(zerovec_orig, zerovec_new);
assert!(matches!(zerovec_new, ZeroVec::Borrowed(_)));
}
#[test]
fn test_chars_invalid() {
let zerovec_orig: ZeroVec<u32> = ZeroVec::from_slice(&[119, 0xD800, 120]);
let bincode_buf = bincode::serialize(&zerovec_orig).expect("serialize");
let zerovec_result = bincode::deserialize::<ZeroVec<char>>(&bincode_buf);
assert!(matches!(zerovec_result, Err(_)));
}
}