-
Notifications
You must be signed in to change notification settings - Fork 214
/
encode.rs
222 lines (165 loc) · 5.44 KB
/
encode.rs
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
// Copyright 2024 RisingLight Project Authors. Licensed under Apache-2.0.
use std::hash::Hash;
use bytes::{Buf, BufMut};
use ordered_float::OrderedFloat;
use rust_decimal::Decimal;
use crate::array::*;
use crate::types::{BlobRef, Date, Interval, Timestamp, TimestampTz, F64};
/// Encode a primitive value into fixed-width buffer
pub trait PrimitiveFixedWidthEncode:
Copy + Clone + 'static + Send + Sync + PartialEq + Hash + Eq
{
/// Width of each element
const WIDTH: usize;
const DEFAULT_VALUE: &'static Self;
type ArrayType: Array<Item = Self>;
/// Encode current primitive data to the end of an `Vec<u8>`.
fn encode(&self, buffer: &mut impl BufMut);
/// Decode a data from a bytes array.
fn decode(buffer: &mut impl Buf) -> Self;
}
impl PrimitiveFixedWidthEncode for bool {
const WIDTH: usize = std::mem::size_of::<u8>();
const DEFAULT_VALUE: &'static bool = &false;
type ArrayType = BoolArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_u8(*self as u8)
}
fn decode(buffer: &mut impl Buf) -> Self {
buffer.get_u8() != 0
}
}
impl PrimitiveFixedWidthEncode for i16 {
const WIDTH: usize = std::mem::size_of::<i16>();
const DEFAULT_VALUE: &'static i16 = &0;
type ArrayType = I16Array;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i16_le(*self);
}
fn decode(buffer: &mut impl Buf) -> Self {
buffer.get_i16_le()
}
}
impl PrimitiveFixedWidthEncode for i32 {
const WIDTH: usize = std::mem::size_of::<i32>();
const DEFAULT_VALUE: &'static i32 = &0;
type ArrayType = I32Array;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i32_le(*self);
}
fn decode(buffer: &mut impl Buf) -> Self {
buffer.get_i32_le()
}
}
impl PrimitiveFixedWidthEncode for i64 {
const WIDTH: usize = std::mem::size_of::<i64>();
const DEFAULT_VALUE: &'static i64 = &0;
type ArrayType = I64Array;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i64_le(*self);
}
fn decode(buffer: &mut impl Buf) -> Self {
buffer.get_i64_le()
}
}
impl PrimitiveFixedWidthEncode for F64 {
const WIDTH: usize = std::mem::size_of::<F64>();
const DEFAULT_VALUE: &'static F64 = &OrderedFloat(0.0);
type ArrayType = F64Array;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_f64_le(self.0);
}
fn decode(buffer: &mut impl Buf) -> Self {
buffer.get_f64_le().into()
}
}
impl PrimitiveFixedWidthEncode for Decimal {
const WIDTH: usize = std::mem::size_of::<Decimal>();
const DEFAULT_VALUE: &'static Self = &Decimal::from_parts(0, 0, 0, false, 0);
type ArrayType = DecimalArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_u128_le(u128::from_le_bytes(self.serialize()))
}
fn decode(buffer: &mut impl Buf) -> Self {
Decimal::deserialize(buffer.get_u128_le().to_le_bytes())
}
}
impl PrimitiveFixedWidthEncode for Date {
const WIDTH: usize = std::mem::size_of::<i32>();
const DEFAULT_VALUE: &'static Self = &Date::new(0);
type ArrayType = DateArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i32(self.get_inner());
}
fn decode(buffer: &mut impl Buf) -> Self {
Date::new(buffer.get_i32())
}
}
impl PrimitiveFixedWidthEncode for Timestamp {
const WIDTH: usize = std::mem::size_of::<i64>();
const DEFAULT_VALUE: &'static Self = &Timestamp::new(0);
type ArrayType = TimestampArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i64(self.get_inner());
}
fn decode(buffer: &mut impl Buf) -> Self {
Timestamp::new(buffer.get_i64())
}
}
impl PrimitiveFixedWidthEncode for TimestampTz {
const WIDTH: usize = std::mem::size_of::<i64>();
const DEFAULT_VALUE: &'static Self = &TimestampTz::new(0);
type ArrayType = TimestampTzArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i64(self.get_inner());
}
fn decode(buffer: &mut impl Buf) -> Self {
TimestampTz::new(buffer.get_i64())
}
}
impl PrimitiveFixedWidthEncode for Interval {
const WIDTH: usize = std::mem::size_of::<i32>() + std::mem::size_of::<i32>();
const DEFAULT_VALUE: &'static Self = &Interval::from_days(0);
type ArrayType = IntervalArray;
fn encode(&self, buffer: &mut impl BufMut) {
buffer.put_i32(self.num_months());
buffer.put_i32(self.days());
}
fn decode(buffer: &mut impl Buf) -> Self {
let months = buffer.get_i32();
let days = buffer.get_i32();
Interval::from_md(months, days)
}
}
pub trait BlobEncode {
type ArrayType: Array<Item = Self>;
/// Returns the length (in bytes) of the blob slice.
fn len(&self) -> usize;
/// Converts a slice of bytes to a blob slice.
fn from_byte_slice(bytes: &[u8]) -> &Self;
fn to_byte_slice(&self) -> &[u8];
}
impl BlobEncode for BlobRef {
type ArrayType = BlobArray;
fn len(&self) -> usize {
self.as_ref().len()
}
fn from_byte_slice(bytes: &[u8]) -> &Self {
BlobRef::new(bytes)
}
fn to_byte_slice(&self) -> &[u8] {
self.as_ref()
}
}
impl BlobEncode for str {
type ArrayType = StringArray;
fn len(&self) -> usize {
self.len()
}
fn from_byte_slice(bytes: &[u8]) -> &Self {
std::str::from_utf8(bytes).unwrap()
}
fn to_byte_slice(&self) -> &[u8] {
self.as_bytes()
}
}