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// Copyright 2022-2024 Gabriel Bjørnager Jensen.
use crate::checksum::Checksum;
use std::error::Error as StdError;
use std::fmt::{Display, Formatter};
use std::process::{ExitCode, Termination};
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
ArrayLengthMismatch { len: usize, ok_len: usize },
DeserialiseFailure { source: Box<dyn StdError> },
EndOfDStream { len: usize, ok_len: usize },
InvalidBoolean { value: u8 },
InvalidCodePoint { value: u32 },
FixedStringTooShort { len: usize, s: String },
InvalidPackageLength { len: usize, ok_len: usize },
NullInteger,
PackageChecksumMismatch { sum: Checksum, ok_sum: Checksum },
}
impl Display for Error {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
use Error::*;
match *self {
ArrayLengthMismatch { len, ok_len } => {
write!(f, "expected array of length ({ok_len}) but got ({len}) elements")
},
DeserialiseFailure { ref source } => {
write!(f, "unable to deserialise: \"{source}\"")
},
EndOfDStream { len, ok_len } => {
write!(f, "({ok_len}) byte(s) were requested but only ({len}) byte(s) were left")
},
FixedStringTooShort { len, ref s } => {
write!(f, "fixed string with `N = {len}` cannot hold {s:?}")
},
InvalidBoolean { value } => {
write!(f, "expected boolean but got {value:#02X}")
},
InvalidCodePoint { value } => {
write!(f, "code point U+{value:04X} is not valid")
}
InvalidPackageLength { len, ok_len } => {
write!(f, "invalid packet length: expected at most ({ok_len}) byte(s) but got ({len}) byte(s)")
},
NullInteger => {
write!(f, "expected non-zero integer but got (0)")
},
PackageChecksumMismatch { ref sum, ref ok_sum } => {
write!(f, "expected packet checksum {ok_sum} but got {sum}")
},
}
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
use Error::*;
match *self {
DeserialiseFailure { ref source } => Some(source.as_ref()),
_ => None,
}
}
}
impl From<Error> for i32 {
fn from(_: Error) -> Self { 0x1 }
}
impl Termination for Error {
#[inline(always)]
fn report(self) -> ExitCode { ExitCode::FAILURE }
}
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