Cannot decode a specific WebP image

[svercl]

trafficstars

This happens when decoding the WebP image from https://httpbin.org/image/webp

Expected

It decodes the image successfully

Actual behaviour

Format error decoding WebP: Invalid Chunk header: [0x92, 0x9F, 0x00, 0x9D]

Reproduction steps

Try loading the image from memory like so:

image::load_from_memory_with_format(include_bytes!("PATH_TO_WEBP_FROM_HTTPBIN"), image::ImageFormat::WebP)
    .expect("loading webp");

[ava57r]

Hello. I have a problem with webp.

thread '<unnamed>' panicked at 'source slice length (738720) does not match destination slice length (915840)', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/codecs/webp/extended.rs:458:21

[ghost]

Attempting to open the image that @bradms linked results in this error (0.24.2): thread 'main' panicked at 'called Result::unwrap()on anErr value: Decoding(DecodingError { format: Exact(WebP), underlying: Some(ChunkHeaderInvalid([146, 159, 0, 157])) })', src/main.rs:2:30

[ava57r]

I have the image test-1.dat.zip

and code

use std::{vec, io::{Read, Cursor}, fs::File};

fn main() {
    let args  = std::env::args().collect::<Vec<_>>();
    if args.len() == 1 {
        println!("file path unrepresented");
        return;
    }
    let file_path = &args[1];
    let mut rdr = File::open(file_path).unwrap();
    let mut raw= vec![];
    rdr.read_to_end(&mut raw).unwrap();

    let image_opt = image::io::Reader::new(Cursor::new(&raw))
            .with_guessed_format()
            .map_err(image::ImageError::IoError)
            .and_then(|rdr| {
                rdr.format()
                    .map(|format| rdr.decode().map(|img| (format, img)))
                    .transpose()
            }).unwrap();
    
    if let Some((format, _img)) = image_opt {
        println!("image format: {:?}", format);
    } else {
        print!("Unknown image format");
    }
    
}

output

thread 'main' panicked at 'source slice length (94128) does not match destination slice length (142884)', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/codecs/webp/extended.rs:458:21
stack backtrace:
   0: rust_begin_unwind
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/std/src/panicking.rs:584:5
   1: core::panicking::panic_fmt
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/panicking.rs:143:14
   2: core::slice::<impl [T]>::copy_from_slice::len_mismatch_fail
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/slice/mod.rs:3161:13
   3: core::slice::<impl [T]>::copy_from_slice
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/slice/mod.rs:3168:13
   4: image::codecs::webp::extended::WebPStatic::fill_buf
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/codecs/webp/extended.rs:458:17
   5: image::codecs::webp::extended::ExtendedImage::fill_buf
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/codecs/webp/extended.rs:311:17
   6: <image::codecs::webp::decoder::WebPDecoder<R> as image::image::ImageDecoder>::read_image
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/codecs/webp/decoder.rs:325:17
   7: image::image::decoder_to_vec
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/image.rs:585:5
   8: image::dynimage::decoder_to_image
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/dynimage.rs:1020:23
   9: image::dynimage::DynamicImage::from_decoder
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/dynimage.rs:175:9
  10: <image::io::free_functions::load_inner::LoadVisitor as image::io::free_functions::DecoderVisitor>::visit_decoder
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/io/free_functions.rs:106:13
  11: image::io::free_functions::load_decoder
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/io/free_functions.rs:62:37
  12: image::io::free_functions::load_inner
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/io/free_functions.rs:110:5
  13: image::io::reader::Reader<R>::decode
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.24.2/./src/io/reader.rs:228:9
  14: test_webp::main::{{closure}}::{{closure}}
             at ./src/main.rs:20:35
  15: core::option::Option<T>::map
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/option.rs:906:29
  16: test_webp::main::{{closure}}
             at ./src/main.rs:19:17
  17: core::result::Result<T,E>::and_then
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/result.rs:1311:22
  18: test_webp::main
             at ./src/main.rs:15:21
  19: core::ops::function::FnOnce::call_once
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[installgentoo]

Image can't handle odd-sized images. https://github.com/image-rs/image/issues/1647 Which is kind of a joke in this day and age.

Webp worked perfectly with libwebp-image that uses non-rust impl.

[rparrett]

It seems that there are two separate issues being described here.

1. An invalid chunk header error
2. An unrelated "slice length" panic

~~Maybe #1779 shouldn't have been closed?~~

~~Here's another reproducer for the second issue: bevy_mod_paramap.webp.zip~~

edit: my particular reproducer was fixed by #1806.

[rparrett]

While my reproducer for the "slice length" panic and the one from #1799 were both seemingly fixed by #1806, https://github.com/image-rs/image/issues/1712#issuecomment-1127393893 seems to be a separate issue that is still present in the latest commit.

[muniategui]

I can confirm that the problem reported by @ava57r persists

Using this https://cdn.7tv.app/emote/638767f24cc489ef45239272/4x.webp image results in panicked at 'source slice length (43008) does not match destination slice length (65536)'

[fintelia]

This is now fixed, I believe thanks to https://github.com/image-rs/image/pull/1959