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

use std::error::Error;
use std::fmt;

pub type Result<T> = std::result::Result<T, PageError>;

#[derive(Debug)]
pub enum PageError {
	InvalidVersion,
	BadSegmentCount,
	MissingMagic,
	Io(std::io::Error),
}

impl fmt::Display for PageError {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		match self {
			PageError::InvalidVersion => {
				write!(f, "Invalid stream structure version (Should always be 0)")
			},
			PageError::BadSegmentCount => write!(f, "Page has a segment count < 1"),
			PageError::MissingMagic => write!(f, "Page is missing a magic signature"),
			PageError::Io(..) => write!(f, "Encountered an std::io::Error"),
		}
	}
}

impl Error for PageError {
	fn source(&self) -> Option<&(dyn Error + 'static)> {
		match *self {
			PageError::Io(ref e) => Some(e),
			_ => None,
		}
	}
}

impl From<std::io::Error> for PageError {
	fn from(err: std::io::Error) -> PageError {
		PageError::Io(err)
	}
}