use std::error::Error;
use std::fmt;
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum PngError {
DeflatedDataTooLong(usize),
TimedOut,
NotPNG,
APNGNotSupported,
InvalidData,
TruncatedData,
ChunkMissing(&'static str),
Other(Box<str>),
}
impl Error for PngError {
fn description(&self) -> &str {
""
}
}
impl fmt::Display for PngError {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
PngError::DeflatedDataTooLong(_) => f.write_str("deflated data too long"),
PngError::TimedOut => f.write_str("timed out"),
PngError::NotPNG => f.write_str("Invalid header detected; Not a PNG file"),
PngError::InvalidData => f.write_str("Invalid data found; unable to read PNG file"),
PngError::TruncatedData => {
f.write_str("Missing data in the file; the file is truncated")
}
PngError::APNGNotSupported => f.write_str("APNG files are not (yet) supported"),
PngError::ChunkMissing(s) => write!(f, "Chunk {} missing or empty", s),
PngError::Other(ref s) => f.write_str(s),
}
}
}
impl PngError {
#[inline]
pub fn new(description: &str) -> PngError {
PngError::Other(description.into())
}
}