dharitri_sc_codec/impl_for_types/
impl_num_signed.rs

1use crate::{
2    dep_encode_num_mimic, DecodeError, DecodeErrorHandler, EncodeErrorHandler, NestedDecode,
3    NestedDecodeInput, NestedEncode, NestedEncodeOutput, TopDecode, TopDecodeInput, TopEncode,
4    TopEncodeOutput,
5};
6
7macro_rules! top_encode_num_signed {
8    ($num_type:ty, $size_in_bits:expr) => {
9        impl TopEncode for $num_type {
10            #[inline]
11            fn top_encode_or_handle_err<O, H>(&self, output: O, _h: H) -> Result<(), H::HandledErr>
12            where
13                O: TopEncodeOutput,
14                H: EncodeErrorHandler,
15            {
16                output.set_i64(*self as i64);
17                Ok(())
18            }
19        }
20    };
21}
22
23top_encode_num_signed! {i64, 64}
24top_encode_num_signed! {i32, 32}
25top_encode_num_signed! {isize, 32}
26top_encode_num_signed! {i16, 16}
27top_encode_num_signed! {i8, 8}
28
29dep_encode_num_mimic! {i64, u64}
30dep_encode_num_mimic! {i32, u32}
31dep_encode_num_mimic! {isize, u32}
32dep_encode_num_mimic! {i16, u16}
33dep_encode_num_mimic! {i8, u8}
34
35macro_rules! dep_decode_num_signed {
36    ($ty:ty, $num_bytes:expr) => {
37        impl NestedDecode for $ty {
38            fn dep_decode_or_handle_err<I, H>(input: &mut I, h: H) -> Result<Self, H::HandledErr>
39            where
40                I: NestedDecodeInput,
41                H: DecodeErrorHandler,
42            {
43                let mut bytes = [0u8; $num_bytes];
44                input.read_into(&mut bytes[..], h)?;
45                let num = <$ty>::from_be_bytes(bytes);
46                Ok(num)
47            }
48        }
49    };
50}
51
52dep_decode_num_signed!(i8, 1);
53dep_decode_num_signed!(i16, 2);
54dep_decode_num_signed!(i32, 4);
55dep_decode_num_signed!(i64, 8);
56
57impl NestedDecode for isize {
58    fn dep_decode_or_handle_err<I, H>(input: &mut I, h: H) -> Result<Self, H::HandledErr>
59    where
60        I: NestedDecodeInput,
61        H: DecodeErrorHandler,
62    {
63        i32::dep_decode_or_handle_err(input, h).map(|num| num as isize)
64    }
65}
66
67macro_rules! top_decode_num_signed {
68    ($ty:ty, $bounds_ty:ty) => {
69        impl TopDecode for $ty {
70            fn top_decode_or_handle_err<I, H>(input: I, h: H) -> Result<Self, H::HandledErr>
71            where
72                I: TopDecodeInput,
73                H: DecodeErrorHandler,
74            {
75                let arg_i64 = input.into_i64(h)?;
76                let min = <$bounds_ty>::MIN as i64;
77                let max = <$bounds_ty>::MAX as i64;
78                if arg_i64 < min || arg_i64 > max {
79                    Err(h.handle_error(DecodeError::INPUT_OUT_OF_RANGE))
80                } else {
81                    Ok(arg_i64 as $ty)
82                }
83            }
84        }
85    };
86}
87
88top_decode_num_signed!(i8, i8);
89top_decode_num_signed!(i16, i16);
90top_decode_num_signed!(i32, i32);
91top_decode_num_signed!(isize, i32); // even if isize can be 64 bits on some platforms, we always deserialize as max 32 bits
92top_decode_num_signed!(i64, i64);
93
94#[cfg(test)]
95pub mod tests {
96    use crate::test_util::{check_dep_encode_decode, check_top_encode_decode};
97
98    #[test]
99    fn test_top() {
100        // signed zero
101        check_top_encode_decode(0i8, &[]);
102        check_top_encode_decode(0i16, &[]);
103        check_top_encode_decode(0i32, &[]);
104        check_top_encode_decode(0i64, &[]);
105        check_top_encode_decode(0isize, &[]);
106        // signed positive
107        check_top_encode_decode(5i8, &[5]);
108        check_top_encode_decode(5i16, &[5]);
109        check_top_encode_decode(5i32, &[5]);
110        check_top_encode_decode(5i64, &[5]);
111        check_top_encode_decode(5isize, &[5]);
112        // signed negative
113        check_top_encode_decode(-5i8, &[251]);
114        check_top_encode_decode(-5i16, &[251]);
115        check_top_encode_decode(-5i32, &[251]);
116        check_top_encode_decode(-5i64, &[251]);
117        check_top_encode_decode(-5isize, &[251]);
118    }
119
120    #[test]
121    fn test_dep() {
122        // signed zero
123        check_dep_encode_decode(0i8, &[0]);
124        check_dep_encode_decode(0i16, &[0, 0]);
125        check_dep_encode_decode(0i32, &[0, 0, 0, 0]);
126        check_dep_encode_decode(0isize, &[0, 0, 0, 0]);
127        check_dep_encode_decode(0i64, &[0, 0, 0, 0, 0, 0, 0, 0]);
128        // signed positive
129        check_dep_encode_decode(5i8, &[5]);
130        check_dep_encode_decode(5i16, &[0, 5]);
131        check_dep_encode_decode(5i32, &[0, 0, 0, 5]);
132        check_dep_encode_decode(5isize, &[0, 0, 0, 5]);
133        check_dep_encode_decode(5i64, &[0, 0, 0, 0, 0, 0, 0, 5]);
134        // signed negative
135        check_dep_encode_decode(-5i8, &[251]);
136        check_dep_encode_decode(-5i16, &[255, 251]);
137        check_dep_encode_decode(-5i32, &[255, 255, 255, 251]);
138        check_dep_encode_decode(-5isize, &[255, 255, 255, 251]);
139        check_dep_encode_decode(-5i64, &[255, 255, 255, 255, 255, 255, 255, 251]);
140    }
141}
dharitri_sc_codec/impl_for_types/impl_num_signed.rs

dharitri_sc_codec/impl_for_types/
impl_num_signed.rs
