inno 0.4.2

Library for reading Inno Setup executables
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

use std::io;

use crc32fast::Hasher;

pub struct Crc32Reader<R: io::Read> {
    inner: R,
    hasher: Hasher,
}

impl<R: io::Read> Crc32Reader<R> {
    pub fn new(inner: R) -> Self {
        Self {
            inner,
            hasher: Hasher::new(),
        }
    }

    /// Gets a reference to the underlying reader.
    #[inline]
    pub const fn get_ref(&self) -> &R {
        &self.inner
    }

    /// Provides mutable access to the inner reader without affecting the hasher.
    #[inline]
    pub const fn get_mut(&mut self) -> &mut R {
        &mut self.inner
    }

    /// Finalize the hash state and return the computed CRC32 value.
    #[inline]
    pub fn finalize(self) -> u32 {
        self.hasher.finalize()
    }
}

impl<R: io::Read> io::Read for Crc32Reader<R> {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        let bytes_read = self.inner.read(buf)?;

        self.hasher.update(&buf[..bytes_read]);

        Ok(bytes_read)
    }
}