kvs 0.0.6

Embedded Key-Value Store
Documentation 
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

use crate::adapters::*;

pub struct MemoryAdapter<const SIZE: usize> {
    pub memory: [u8; SIZE],
}

impl<const SIZE: usize> Default for MemoryAdapter<SIZE> {
    fn default() -> Self {
        Self::new([0; SIZE])
    }
}

impl<const SIZE: usize> MemoryAdapter<SIZE> {
    pub fn new(memory: [u8; SIZE]) -> Self {
        Self { memory }
    }

    pub fn release(self) -> [u8; SIZE] {
        self.memory
    }
}

impl<const SIZE: usize> StoreAdapter for MemoryAdapter<SIZE> {
    type Error = ();

    fn read(&mut self, addr: Address, buf: &mut [u8]) -> Result<(), Self::Error> {
        if addr + buf.len() > SIZE {
            return Err(());
        }
        buf.copy_from_slice(&self.memory[addr..(addr + buf.len())]);
        Ok(())
    }

    fn write(&mut self, addr: Address, data: &[u8]) -> Result<(), Self::Error> {
        if addr + data.len() > SIZE {
            return Err(());
        }
        self.memory[addr..(addr + data.len())].copy_from_slice(data);
        Ok(())
    }

    fn max_address(&self) -> Address {
        SIZE
    }
}

pub struct RefMemoryAdapter<'a> {
    pub memory: &'a mut [u8],
}

impl<'a> RefMemoryAdapter<'a> {
    pub fn new(memory: &'a mut [u8]) -> Self {
        Self { memory }
    }

    pub fn release(self) -> &'a mut [u8] {
        self.memory
    }
}

impl<'a> StoreAdapter for RefMemoryAdapter<'a> {
    type Error = ();

    fn read(&mut self, addr: Address, buf: &mut [u8]) -> Result<(), Self::Error> {
        if addr + buf.len() > self.max_address() {
            return Err(());
        }
        buf.copy_from_slice(&self.memory[addr..(addr + buf.len())]);
        Ok(())
    }

    fn write(&mut self, addr: Address, data: &[u8]) -> Result<(), Self::Error> {
        if addr + data.len() > self.max_address() {
            return Err(());
        }
        self.memory[addr..(addr + data.len())].copy_from_slice(data);
        Ok(())
    }

    fn max_address(&self) -> Address {
        self.memory.len()
    }
}