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use std::{error, fmt, io, string};
use crate::Ident;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum ErrorKind {
AtomNotFound(Ident),
Io(io::Error),
InvalidFiletype(String),
NoTag,
Parsing,
UnknownDataType(u32),
UnknownMediaType(u8),
Utf8StringDecoding(string::FromUtf8Error),
Utf16StringDecoding(string::FromUtf16Error),
}
pub struct Error {
pub kind: ErrorKind,
pub description: String,
}
impl Error {
pub fn new(kind: ErrorKind, description: String) -> Error {
Error { kind, description }
}
}
impl error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> {
match self.kind {
ErrorKind::Io(ref err) => Some(err),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error { kind: ErrorKind::Io(err), description: "".to_owned() }
}
}
impl From<string::FromUtf8Error> for Error {
fn from(err: string::FromUtf8Error) -> Error {
Error {
kind: ErrorKind::Utf8StringDecoding(err),
description: "Data is not valid utf-8.".to_owned(),
}
}
}
impl From<string::FromUtf16Error> for Error {
fn from(err: string::FromUtf16Error) -> Error {
Error {
kind: ErrorKind::Utf16StringDecoding(err),
description: "Data is not valid utf-16.".to_owned(),
}
}
}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.description.is_empty() {
write!(f, "{:?}", self.kind)
} else {
write!(f, "{:?}: {}", self.kind, self.description)
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.description.is_empty() {
write!(f, "{:?}", self.kind)
} else {
write!(f, "{:?}: {}", self.kind, self.description)
}
}
}