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use std::error;
use std::fmt;
use std::ops::Deref;
/// An error type that represents the different kinds of errors that may be
/// encountered during message parsing.
#[derive(Debug)]
pub enum MailParseError {
/// Data that was specified as being in the quoted-printable transfer-encoding
/// could not be successfully decoded as quoted-printable data.
QuotedPrintableDecodeError(quoted_printable::QuotedPrintableError),
/// Data that was specified as being in the base64 transfer-encoding could
/// not be successfully decoded as base64 data.
Base64DecodeError(base64::DecodeError),
/// An error occurred when converting the raw byte data to Rust UTF-8 string
/// format using the charset specified in the message.
EncodingError(std::borrow::Cow<'static, str>),
/// Some other error occurred while parsing the message; the description string
/// provides additional details.
Generic(&'static str),
}
impl fmt::Display for MailParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
MailParseError::QuotedPrintableDecodeError(ref err) => {
write!(f, "QuotedPrintable decode error: {}", err)
}
MailParseError::Base64DecodeError(ref err) => write!(f, "Base64 decode error: {}", err),
MailParseError::EncodingError(ref err) => write!(f, "Encoding error: {}", err),
MailParseError::Generic(ref description) => write!(f, "{}", description),
}
}
}
impl error::Error for MailParseError {
fn description(&self) -> &str {
match *self {
MailParseError::QuotedPrintableDecodeError(ref err) => err.description(),
MailParseError::Base64DecodeError(ref err) => err.description(),
MailParseError::EncodingError(ref err) => err.deref(),
_ => "An error occurred while attempting to parse the input",
}
}
fn cause(&self) -> Option<&dyn error::Error> {
match *self {
MailParseError::QuotedPrintableDecodeError(ref err) => Some(err),
MailParseError::Base64DecodeError(ref err) => Some(err),
_ => None,
}
}
}
impl From<quoted_printable::QuotedPrintableError> for MailParseError {
fn from(err: quoted_printable::QuotedPrintableError) -> MailParseError {
MailParseError::QuotedPrintableDecodeError(err)
}
}
impl From<base64::DecodeError> for MailParseError {
fn from(err: base64::DecodeError) -> MailParseError {
MailParseError::Base64DecodeError(err)
}
}
impl From<std::borrow::Cow<'static, str>> for MailParseError {
fn from(err: std::borrow::Cow<'static, str>) -> MailParseError {
MailParseError::EncodingError(err)
}
}
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