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use std::fmt::Display; use std::error::Error; #[derive(Debug)] pub enum JfifError { JfifMarkerNotFound, InvalidMarker(u8), InvalidMarkerLength(usize), IoError(std::io::Error), } impl From<std::io::Error> for JfifError { fn from(err: std::io::Error) -> JfifError { JfifError::IoError(err) } } impl Display for JfifError { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { use JfifError::*; match self { JfifMarkerNotFound => write!(f, "Not a JFIF file"), InvalidMarker(value) => write!(f, "Invalid marker: {:X}", value), InvalidMarkerLength(length) => write!(f, "Invalid length for marker: {}", length), IoError(err) => err.fmt(f), } } } impl Error for JfifError { fn source(&self) -> Option<&(dyn Error + 'static)> { match self { JfifError::IoError(err) => Some(err), _ => None } } }