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use scroll;
use core::result;
use core::fmt::{self, Display};
use alloc::string::String;
#[cfg(feature = "std")]
use std::{error, io};
#[derive(Debug)]
pub enum Error {
Malformed(String),
BadMagic(u64),
Scroll(scroll::Error),
#[cfg(feature = "std")]
IO(io::Error),
}
impl Error {
pub fn description(&self) -> &str {
match *self {
#[cfg(feature = "std")]
Error::IO(_) => { "IO error" }
Error::Scroll(_) => { "Scroll error" }
Error::BadMagic(_) => { "Invalid magic number" }
Error::Malformed(_) => { "Entity is malformed in some way" }
}
}
}
#[cfg(feature = "std")]
impl error::Error for Error {
fn description(&self) -> &str {
Error::description(self)
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::IO(ref io) => { io.cause() }
Error::Scroll(ref scroll) => { scroll.cause() }
Error::BadMagic(_) => { None }
Error::Malformed(_) => { None }
}
}
}
#[cfg(feature = "std")]
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::IO(err)
}
}
impl From<scroll::Error> for Error {
fn from(err: scroll::Error) -> Error {
Error::Scroll(err)
}
}
impl Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
#[cfg(feature = "std")]
Error::IO(ref err) => { write!(fmt, "{}", err) },
Error::Scroll(ref err) => { write!(fmt, "{}", err) },
Error::BadMagic(magic) => { write! (fmt, "Invalid magic number: 0x{:x}", magic) },
Error::Malformed(ref msg) => { write! (fmt, "Malformed entity: {}", msg) },
}
}
}
pub type Result<T> = result::Result<T, Error>;