51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use std::error::Error;
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use std::fmt;
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// TODO: Use `#[non_exhaustive]` once stabilized
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// https://github.com/rust-lang/rust/issues/44109
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#[derive(Debug, Clone)]
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pub enum PngError {
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DeflatedDataTooLong(usize),
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TimedOut,
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NotPNG,
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APNGNotSupported,
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InvalidData,
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TruncatedData,
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ChunkMissing(&'static str),
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Other(Box<str>),
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#[doc(hidden)]
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_Nonexhaustive,
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}
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impl Error for PngError {
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// deprecated
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fn description(&self) -> &str {
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""
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}
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}
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impl fmt::Display for PngError {
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#[inline]
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match *self {
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PngError::DeflatedDataTooLong(_) => f.write_str("deflated data too long"),
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PngError::TimedOut => f.write_str("timed out"),
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PngError::NotPNG => f.write_str("Invalid header detected; Not a PNG file"),
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PngError::InvalidData => f.write_str("Invalid data found; unable to read PNG file"),
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PngError::TruncatedData => {
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f.write_str("Missing data in the file; the file is truncated")
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}
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PngError::APNGNotSupported => f.write_str("APNG files are not (yet) supported"),
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PngError::ChunkMissing(s) => write!(f, "Chunk {} missing or empty", s),
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PngError::Other(ref s) => f.write_str(s),
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PngError::_Nonexhaustive => unreachable!(),
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}
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}
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}
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impl PngError {
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#[inline]
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pub fn new(description: &str) -> PngError {
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PngError::Other(description.into())
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}
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}
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