carbites 0.1.2

CAR file splitted implementation in Rust
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

use std::io::{Read, Seek, SeekFrom};

use ipld::{Block, Cid, Ipld};

use crate::error::CarSplitterError;

#[derive(Debug, Clone)]
pub struct Section {
    cid: Cid,
    pos: u64,
    len: usize,
}

impl Section {
    pub fn new(cid: Cid, pos: u64, len: usize) -> Self {
        Self { cid, pos, len }
    }

    #[inline]
    pub fn read_data<T>(&self, mut seeker: T) -> Result<Vec<u8>, CarSplitterError>
    where
        T: Seek + Read,
    {
        seeker.seek(SeekFrom::Start(self.pos))?;
        let mut buf = vec![0u8; self.len];
        seeker.read_exact(&mut buf)?;
        Ok(buf)
    }

    #[inline]
    pub fn ipld<T>(&mut self, mut seeker: T) -> Result<Ipld, CarSplitterError>
    where
        T: Seek + Read,
    {
        let data = self.read_data(&mut seeker)?;
        let block = Block::<ipld::DefaultParams>::new(self.cid, data).unwrap();
        block
            .ipld()
            .map_err(|e| CarSplitterError::Parsing(e.to_string()))
    }

    #[inline(always)]
    pub fn cid(&self) -> Cid {
        self.cid
    }

    #[inline(always)]
    pub fn pos(&self) -> u64 {
        self.pos
    }

    #[allow(clippy::len_without_is_empty)]
    #[inline(always)]
    pub fn len(&self) -> usize {
        self.len
    }
}