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
use crate::{encode_section, Encode, Section, SectionId};
#[derive(Clone, Default, Debug)]
pub struct MemorySection {
bytes: Vec<u8>,
num_added: u32,
}
impl MemorySection {
pub fn new() -> Self {
Self::default()
}
pub fn len(&self) -> u32 {
self.num_added
}
pub fn is_empty(&self) -> bool {
self.num_added == 0
}
pub fn memory(&mut self, memory_type: MemoryType) -> &mut Self {
memory_type.encode(&mut self.bytes);
self.num_added += 1;
self
}
}
impl Encode for MemorySection {
fn encode(&self, sink: &mut Vec<u8>) {
encode_section(sink, self.num_added, &self.bytes);
}
}
impl Section for MemorySection {
fn id(&self) -> u8 {
SectionId::Memory.into()
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct MemoryType {
pub minimum: u64,
pub maximum: Option<u64>,
pub memory64: bool,
pub shared: bool,
}
impl Encode for MemoryType {
fn encode(&self, sink: &mut Vec<u8>) {
let mut flags = 0;
if self.maximum.is_some() {
flags |= 0b001;
}
if self.shared {
flags |= 0b010;
}
if self.memory64 {
flags |= 0b100;
}
sink.push(flags);
self.minimum.encode(sink);
if let Some(max) = self.maximum {
max.encode(sink);
}
}
}