object_rainbow/
length_prefixed.rs

1use std::ops::{Add, Deref, DerefMut};
2
3use generic_array::ArrayLength;
4use typenum::{Sum, U8, Unsigned, tarr};
5
6use crate::{numeric::Le, *};
7
8#[derive(Topological, Tagged, Object, Inline, ReflessObject, ReflessInline, ParseAsInline)]
9pub struct Lp<T>(pub T);
10
11impl<T> Deref for Lp<T> {
12    type Target = T;
13
14    fn deref(&self) -> &Self::Target {
15        &self.0
16    }
17}
18
19impl<T> DerefMut for Lp<T> {
20    fn deref_mut(&mut self) -> &mut Self::Target {
21        &mut self.0
22    }
23}
24
25impl<T: ToOutput> ToOutput for Lp<T> {
26    fn to_output(&self, output: &mut dyn crate::Output) {
27        let data = self.0.output::<Vec<u8>>();
28        let len = data.len();
29        let len = len as u64;
30        assert_ne!(len, u64::MAX);
31        let prefix = Le::<u64>(len);
32        prefix.to_output(output);
33        data.to_output(output);
34    }
35}
36
37impl<T: Size> Size for Lp<T>
38where
39    U8: Add<T::Size, Output: Unsigned>,
40{
41    type Size = Sum<U8, T::Size>;
42}
43
44impl<T: Size> MaybeHasNiche for Lp<T>
45where
46    U8: Add<T::Size, Output: ArrayLength>,
47{
48    type MnArray = tarr![SomeNiche<ZeroNiche<U8>>, NoNiche<ZeroNoNiche<T::Size>>];
49}
50
51impl<T: Parse<I>, I: ParseInput> ParseInline<I> for Lp<T> {
52    fn parse_inline(input: &mut I) -> crate::Result<Self> {
53        let prefix: Le<u64> = input.parse_inline()?;
54        let len = prefix.0;
55        let len = len.try_into().map_err(|_| Error::LenOutOfBounds)?;
56        Ok(Self(input.parse_ahead(len)?))
57    }
58}
59
60#[test]
61fn prefixed() {
62    let a = Lp(vec![0, 1, 2]);
63    let data = a.output::<Vec<u8>>();
64    let b = Lp::<Vec<u8>>::parse_slice_refless(&data).unwrap();
65    assert_eq!(*a, *b);
66}
67
68#[derive(Debug, Clone, ParseAsInline, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
69pub struct LpBytes(pub Vec<u8>);
70
71impl Deref for LpBytes {
72    type Target = Vec<u8>;
73
74    fn deref(&self) -> &Self::Target {
75        &self.0
76    }
77}
78
79impl DerefMut for LpBytes {
80    fn deref_mut(&mut self) -> &mut Self::Target {
81        &mut self.0
82    }
83}
84
85impl ToOutput for LpBytes {
86    fn to_output(&self, output: &mut dyn crate::Output) {
87        let data = &self.0;
88        let len = data.len();
89        let len = len as u64;
90        assert_ne!(len, u64::MAX);
91        let prefix = Le::<u64>(len);
92        prefix.to_output(output);
93        data.to_output(output);
94    }
95}
96
97impl<I: ParseInput> ParseInline<I> for LpBytes {
98    fn parse_inline(input: &mut I) -> crate::Result<Self> {
99        let prefix: Le<u64> = input.parse_inline()?;
100        let len = prefix.0;
101        let len = len.try_into().map_err(|_| Error::LenOutOfBounds)?;
102        Ok(Self(input.parse_n(len)?.into()))
103    }
104}
105
106impl Topological for LpBytes {}
107impl Tagged for LpBytes {}
108impl Object for LpBytes {}
109impl Inline for LpBytes {}
110impl ReflessObject for LpBytes {}
111impl ReflessInline for LpBytes {}
112
113#[derive(Debug, Clone, ParseAsInline, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
114pub struct LpString(pub String);
115
116impl Deref for LpString {
117    type Target = String;
118
119    fn deref(&self) -> &Self::Target {
120        &self.0
121    }
122}
123
124impl DerefMut for LpString {
125    fn deref_mut(&mut self) -> &mut Self::Target {
126        &mut self.0
127    }
128}
129
130impl ToOutput for LpString {
131    fn to_output(&self, output: &mut dyn crate::Output) {
132        let data = self.0.as_bytes();
133        let len = data.len();
134        let len = len as u64;
135        assert_ne!(len, u64::MAX);
136        let prefix = Le::<u64>(len);
137        prefix.to_output(output);
138        data.to_output(output);
139    }
140}
141
142impl<I: ParseInput> ParseInline<I> for LpString {
143    fn parse_inline(input: &mut I) -> crate::Result<Self> {
144        String::from_utf8(input.parse_inline::<LpBytes>()?.0)
145            .map_err(Error::Utf8)
146            .map(Self)
147    }
148}
149
150impl Topological for LpString {}
151impl Tagged for LpString {}
152impl Object for LpString {}
153impl Inline for LpString {}
154impl ReflessObject for LpString {}
155impl ReflessInline for LpString {}
object_rainbow/length_prefixed.rs

object_rainbow/
length_prefixed.rs
