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 std::convert::TryFrom;

use crate::{error::Error, format_code::EncodingCodes};

/// Offset of List in other implementations
/// The two implementations below do not count the byte(s) taken by `size` itself
/// 1. amqpnetlite: for List32
/// ```csharp
/// listSize = (totalBufferLength - 5); // totalBufferLength includes format code
/// ```
/// 2. qpid-protonj2: for List32
/// ```java
/// buffer.setInt(startIndex, endIndex - startIndex - 4); // startIndex is the byte after format code, endIndex is the end of the buffer
/// ```
/// offset includes 1 byte of `count`
pub const OFFSET_LIST8: usize = 1;
/// offset includes 4 byte of `count`
pub const OFFSET_LIST32: usize = 4;

/// offset includes 1 byte of `count`
pub const OFFSET_MAP8: usize = 1;
/// offset includes 4 byte of `count`
pub const OFFSET_MAP32: usize = 4;

/// offset includes 1 byte of `count` and 1 byte of element format code
pub const OFFSET_ARRAY8: usize = 2;
/// offset includes 4 bytes of `count` and 1 byte of element format code
pub const OFFSET_ARRAY32: usize = 5;

pub enum Category {
    Fixed(FixedWidth),
    Encoded(EncodedWidth),
}

#[repr(u8)]
pub enum FixedWidth {
    Zero = 0,
    One = 1,
    Two = 2,
    Four = 4,
    Eight = 8,
    Sixteen = 16,
}

#[repr(u8)]
pub enum EncodedWidth {
    Zero = 0,
    One = 1,
    Four = 4,
}

// #[repr(u8)]
// pub enum VariableWidth {
//     One = 1,
//     Four = 4,
// }

// #[repr(u8)]
// pub enum CompoundWidth {
//     Zero = 0,
//     One = 1,
//     Four = 4,
// }

// #[repr(u8)]
// pub enum ArrayWidth {
//     One = 1,
//     Four = 4,
// }

impl TryFrom<EncodingCodes> for Category {
    type Error = Error;

    fn try_from(value: EncodingCodes) -> Result<Self, Self::Error> {
        let value = match value {
            EncodingCodes::DescribedType => return Err(Error::IsDescribedType),

            EncodingCodes::Null => Category::Fixed(FixedWidth::Zero),

            EncodingCodes::Boolean => Category::Fixed(FixedWidth::One),
            EncodingCodes::BooleanTrue => Category::Fixed(FixedWidth::Zero),
            EncodingCodes::BooleanFalse => Category::Fixed(FixedWidth::Zero),

            // u8
            EncodingCodes::UByte => Category::Fixed(FixedWidth::One),

            // u16
            EncodingCodes::UShort => Category::Fixed(FixedWidth::Two),

            // u32
            EncodingCodes::UInt => Category::Fixed(FixedWidth::Four),
            EncodingCodes::SmallUInt => Category::Fixed(FixedWidth::One),
            EncodingCodes::UInt0 => Category::Fixed(FixedWidth::Zero),

            // u64
            EncodingCodes::ULong => Category::Fixed(FixedWidth::Eight),
            EncodingCodes::SmallULong => Category::Fixed(FixedWidth::One),
            EncodingCodes::ULong0 => Category::Fixed(FixedWidth::Zero),

            // i8
            EncodingCodes::Byte => Category::Fixed(FixedWidth::One),

            // i16
            EncodingCodes::Short => Category::Fixed(FixedWidth::Two),

            // i32
            EncodingCodes::Int => Category::Fixed(FixedWidth::Four),
            EncodingCodes::SmallInt => Category::Fixed(FixedWidth::One),

            // i64
            EncodingCodes::Long => Category::Fixed(FixedWidth::Eight),
            EncodingCodes::SmallLong => Category::Fixed(FixedWidth::One),

            // f32
            EncodingCodes::Float => Category::Fixed(FixedWidth::Four),

            // f64
            EncodingCodes::Double => Category::Fixed(FixedWidth::Eight),

            EncodingCodes::Decimal32 => Category::Fixed(FixedWidth::Four),
            EncodingCodes::Decimal64 => Category::Fixed(FixedWidth::Eight),
            EncodingCodes::Decimal128 => Category::Fixed(FixedWidth::Sixteen),

            EncodingCodes::Char => Category::Fixed(FixedWidth::Four),

            EncodingCodes::Timestamp => Category::Fixed(FixedWidth::Eight),

            EncodingCodes::Uuid => Category::Fixed(FixedWidth::Sixteen),

            EncodingCodes::VBin8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::VBin32 => Category::Encoded(EncodedWidth::Four),

            EncodingCodes::Str8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::Str32 => Category::Encoded(EncodedWidth::Four),

            EncodingCodes::Sym8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::Sym32 => Category::Encoded(EncodedWidth::Four),

            EncodingCodes::List0 => Category::Encoded(EncodedWidth::Zero),
            EncodingCodes::List8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::List32 => Category::Encoded(EncodedWidth::Four),

            EncodingCodes::Map8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::Map32 => Category::Encoded(EncodedWidth::Four),

            EncodingCodes::Array8 => Category::Encoded(EncodedWidth::One),
            EncodingCodes::Array32 => Category::Encoded(EncodedWidth::Four),
        };

        Ok(value)
    }
}