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
use std::io;
use std::result;
use std::fmt;
use std::borrow::Cow;
use std::error;
use num::ToPrimitive;
#[derive(Debug)]
pub enum Error {
InvalidFormat(Cow<'static, str>),
UnexpectedEndOfFile(Option<Cow<'static, str>>),
Io(io::Error)
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::InvalidFormat(ref s) => write!(f, "invalid image format: {}", s),
Error::UnexpectedEndOfFile(None) => write!(f, "unexpected end of file"),
Error::UnexpectedEndOfFile(Some(ref s)) => write!(f, "unexpected end of file: {}", s),
Error::Io(ref e) => write!(f, "I/O error: {}", e)
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::InvalidFormat(_) => "invalid image format",
Error::UnexpectedEndOfFile(_) => "unexpected end of file",
Error::Io(_) => "i/o error"
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::Io(ref e) => Some(e),
_ => None
}
}
}
impl From<io::Error> for Error {
#[inline]
fn from(e: io::Error) -> Error {
Error::Io(e)
}
}
impl From<::byteorder::Error> for Error {
#[inline]
fn from(e: ::byteorder::Error) -> Error {
match e {
::byteorder::Error::UnexpectedEOF => Error::UnexpectedEndOfFile(None),
::byteorder::Error::Io(e) => Error::Io(e)
}
}
}
pub type Result<T> = result::Result<T, Error>;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct Dimensions {
pub width: u32,
pub height: u32
}
impl<T: ToPrimitive, U: ToPrimitive> From<(T, U)> for Dimensions {
fn from((w, h): (T, U)) -> Dimensions {
Dimensions {
width: w.to_u32().unwrap(),
height: h.to_u32().unwrap()
}
}
}