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

use crate::{
    dep_encode_from_no_err, dep_encode_num_mimic, num_conv::bytes_to_number,
    top_encode_from_no_err, top_ser::TopEncodeNoErr, DecodeError, EncodeError, NestedDecode,
    NestedDecodeInput, NestedEncode, NestedEncodeNoErr, NestedEncodeOutput, TopDecode,
    TopDecodeInput, TopEncode, TopEncodeOutput, TypeInfo,
};

macro_rules! top_encode_num_signed {
    ($num_type:ty, $size_in_bits:expr, $type_info:expr) => {
        impl TopEncodeNoErr for $num_type {
            #[inline]
            fn top_encode_no_err<O: TopEncodeOutput>(&self, output: O) {
                output.set_i64(*self as i64);
            }
        }

        top_encode_from_no_err! {$num_type, $type_info}
    };
}

top_encode_num_signed! {i64, 64, TypeInfo::I64}
top_encode_num_signed! {i32, 32, TypeInfo::I32}
top_encode_num_signed! {isize, 32, TypeInfo::ISIZE}
top_encode_num_signed! {i16, 16, TypeInfo::I16}
top_encode_num_signed! {i8, 8, TypeInfo::I8}

dep_encode_num_mimic! {i64, u64, TypeInfo::I64}
dep_encode_num_mimic! {i32, u32, TypeInfo::I32}
dep_encode_num_mimic! {isize, u32, TypeInfo::ISIZE}
dep_encode_num_mimic! {i16, u16, TypeInfo::I16}
dep_encode_num_mimic! {i8, u8, TypeInfo::I8}

macro_rules! dep_decode_num_signed {
    ($ty:ty, $num_bytes:expr, $type_info:expr) => {
        impl NestedDecode for $ty {
            const TYPE_INFO: TypeInfo = $type_info;

            fn dep_decode<I: NestedDecodeInput>(input: &mut I) -> Result<Self, DecodeError> {
                let mut bytes = [0u8; $num_bytes];
                input.read_into(&mut bytes[..])?;
                let num = bytes_to_number(&bytes[..], true) as $ty;
                Ok(num)
            }

            fn dep_decode_or_exit<I: NestedDecodeInput, ExitCtx: Clone>(
                input: &mut I,
                c: ExitCtx,
                exit: fn(ExitCtx, DecodeError) -> !,
            ) -> Self {
                let mut bytes = [0u8; $num_bytes];
                input.read_into_or_exit(&mut bytes[..], c, exit);
                let num = bytes_to_number(&bytes[..], true) as $ty;
                num
            }
        }
    };
}

dep_decode_num_signed!(i8, 1, TypeInfo::I8);
dep_decode_num_signed!(i16, 2, TypeInfo::I16);
dep_decode_num_signed!(i32, 4, TypeInfo::I32);
dep_decode_num_signed!(isize, 4, TypeInfo::ISIZE);
dep_decode_num_signed!(i64, 8, TypeInfo::I64);

macro_rules! top_decode_num_signed {
    ($ty:ty, $bounds_ty:ty, $type_info:expr) => {
        impl TopDecode for $ty {
            const TYPE_INFO: TypeInfo = $type_info;

            fn top_decode<I: TopDecodeInput>(input: I) -> Result<Self, DecodeError> {
                let arg_i64 = input.into_i64();
                let min = <$bounds_ty>::MIN as i64;
                let max = <$bounds_ty>::MAX as i64;
                if arg_i64 < min || arg_i64 > max {
                    Err(DecodeError::INPUT_OUT_OF_RANGE)
                } else {
                    Ok(arg_i64 as $ty)
                }
            }

            fn top_decode_or_exit<I: TopDecodeInput, ExitCtx: Clone>(
                input: I,
                c: ExitCtx,
                exit: fn(ExitCtx, DecodeError) -> !,
            ) -> Self {
                let arg_i64 = input.into_i64();
                let min = <$bounds_ty>::MIN as i64;
                let max = <$bounds_ty>::MAX as i64;
                if arg_i64 < min || arg_i64 > max {
                    exit(c, DecodeError::INPUT_OUT_OF_RANGE)
                } else {
                    arg_i64 as $ty
                }
            }
        }
    };
}

top_decode_num_signed!(i8, i8, TypeInfo::I8);
top_decode_num_signed!(i16, i16, TypeInfo::I16);
top_decode_num_signed!(i32, i32, TypeInfo::I32);
top_decode_num_signed!(isize, i32, TypeInfo::ISIZE); // even if isize can be 64 bits on some platforms, we always deserialize as max 32 bits
top_decode_num_signed!(i64, i64, TypeInfo::I64);

#[cfg(test)]
pub mod tests {
    use crate::test_util::{check_dep_encode_decode, check_top_encode_decode};

    #[test]
    fn test_top() {
        // signed zero
        check_top_encode_decode(0i8, &[]);
        check_top_encode_decode(0i16, &[]);
        check_top_encode_decode(0i32, &[]);
        check_top_encode_decode(0i64, &[]);
        check_top_encode_decode(0isize, &[]);
        // signed positive
        check_top_encode_decode(5i8, &[5]);
        check_top_encode_decode(5i16, &[5]);
        check_top_encode_decode(5i32, &[5]);
        check_top_encode_decode(5i64, &[5]);
        check_top_encode_decode(5isize, &[5]);
        // signed negative
        check_top_encode_decode(-5i8, &[251]);
        check_top_encode_decode(-5i16, &[251]);
        check_top_encode_decode(-5i32, &[251]);
        check_top_encode_decode(-5i64, &[251]);
        check_top_encode_decode(-5isize, &[251]);
    }

    #[test]
    fn test_dep() {
        // signed zero
        check_dep_encode_decode(0i8, &[0]);
        check_dep_encode_decode(0i16, &[0, 0]);
        check_dep_encode_decode(0i32, &[0, 0, 0, 0]);
        check_dep_encode_decode(0isize, &[0, 0, 0, 0]);
        check_dep_encode_decode(0i64, &[0, 0, 0, 0, 0, 0, 0, 0]);
        // signed positive
        check_dep_encode_decode(5i8, &[5]);
        check_dep_encode_decode(5i16, &[0, 5]);
        check_dep_encode_decode(5i32, &[0, 0, 0, 5]);
        check_dep_encode_decode(5isize, &[0, 0, 0, 5]);
        check_dep_encode_decode(5i64, &[0, 0, 0, 0, 0, 0, 0, 5]);
        // signed negative
        check_dep_encode_decode(-5i8, &[251]);
        check_dep_encode_decode(-5i16, &[255, 251]);
        check_dep_encode_decode(-5i32, &[255, 255, 255, 251]);
        check_dep_encode_decode(-5isize, &[255, 255, 255, 251]);
        check_dep_encode_decode(-5i64, &[255, 255, 255, 255, 255, 255, 255, 251]);
    }
}