Add support for reading extended XMP metadata and implement it for JPEG.

Cargo.toml

@@ -59,7 +59,7 @@ rayon = { version = "1.7.0", optional = true }
 rgb = { version = "0.8.48", default-features = false, optional = true }
 tiff = { version = "0.10.3", optional = true }
 zune-core = { version = "0.5.0", default-features = false, optional = true }
-zune-jpeg = { version = "0.5.5", optional = true }
+zune-jpeg = { version = "0.5.13", optional = true }
 jpeg-encoder = { version = "0.7.0", optional = true, features = ["simd"] }
 serde = { version = "1.0.214", optional = true, features = ["derive"] }
 pic-scale-safe = "0.1.5"

src/codecs/jpeg/decoder.rs

@@ -125,6 +125,24 @@ impl<R: BufRead + Seek> ImageDecoder for JpegDecoder<R> {
         Ok(decoder.xmp().cloned())
     }
 
+    fn extended_xmp_metadata(&mut self) -> ImageResult<Option<(String, Vec<u8>)>> {
+        let options = zune_core::options::DecoderOptions::default()
+            .set_strict_mode(false)
+            .set_max_width(usize::MAX)
+            .set_max_height(usize::MAX);
+        let mut decoder =
+            zune_jpeg::JpegDecoder::new_with_options(ZCursor::new(&self.input), options);
+        decoder.decode_headers().map_err(ImageError::from_jpeg)?;
+
+        if let Some(info) = decoder.info() {
+            if let (Some(guid), Some(data)) = (info.extended_xmp_guid, info.extended_xmp) {
+                let guid_str = String::from_utf8_lossy(&guid).into_owned();
+                return Ok(Some((guid_str, data)));
+            }
+        }
+        Ok(None)
+    }
+
     fn iptc_metadata(&mut self) -> ImageResult<Option<Vec<u8>>> {
         let options = zune_core::options::DecoderOptions::default()
             .set_strict_mode(false)

src/io/decoder.rs

@@ -39,6 +39,15 @@ pub trait ImageDecoder {
         Ok(None)
     }
 
+    /// Returns the raw [Extended XMP](https://en.wikipedia.org/wiki/Extensible_Metadata_Platform) metadata, if present.
+    ///
+    /// This is typically used in JPEG files when the XMP data exceeds 64KB.
+    /// Returns `Ok(Some((guid, data)))` where `guid` is the 128-bit GUID (as a 32-character hex string)
+    /// and `data` is the concatenated extended XMP data.
+    fn extended_xmp_metadata(&mut self) -> ImageResult<Option<(String, Vec<u8>)>> {
+        Ok(None)
+    }
+
     /// Returns the raw [IPTC](https://en.wikipedia.org/wiki/IPTC_Information_Interchange_Model) chunk, if it is present.
     ///
     /// For formats that don't support embedded profiles this function should always return `Ok(None)`.
@@ -152,6 +161,9 @@ impl<T: ?Sized + ImageDecoder> ImageDecoder for Box<T> {
     fn xmp_metadata(&mut self) -> ImageResult<Option<Vec<u8>>> {
         (**self).xmp_metadata()
     }
+    fn extended_xmp_metadata(&mut self) -> ImageResult<Option<(String, Vec<u8>)>> {
+        (**self).extended_xmp_metadata()
+    }
     fn iptc_metadata(&mut self) -> ImageResult<Option<Vec<u8>>> {
         (**self).iptc_metadata()
     }