Corrupted JPEG does not result in visible error code #169
Description
This image is corrupt and will not decode in most image decoders (convert; opencv imread), but does not produce a decoding error in jpeg-decoder. Whether this is a problem is debatable, of course - for an image viewer it's good to be able to display the partial, corrupted image - but it's also nice for a library to be able to report that there's a glitch.
A simple program to validate the lack of error:
use anyhow::{anyhow, Result};
fn doit() -> Result<()> {
let f = "839442a6aa3dcca42f4962e8ec87b999.jpg";
let of = std::fs::File::open(f)?;
let mut decoder = jpeg_decoder::Decoder::new(std::io::BufReader::new(of));
decoder.read_info()?;
let md = decoder.info().unwrap();
println!("Metadata: {:#?} h/w: {} {}", md, md.height, md.width);
let pixels = decoder.decode()?;
println!("Pixel count: {}", pixels.len());
println!("Happy image by jpeg crate");
Ok(())
}
fn main() {
if let Err(e) = doit() {
println!("Error reading jpeg: {}", e);
}
}
Which, when run, produces:
/target/debug/jpegcheck
Metadata: ImageInfo {
width: 2560,
height: 1920,
pixel_format: RGB24,
} h/w: 1920 2560
Pixel count: 14745600
Happy image by jpeg crate