https://github.com/mike10004/jpeg-segment-finder

Java library to determine the offsets and lengths of metadata segments in a JPEG file.
https://github.com/mike10004/jpeg-segment-finder

Last synced: 15 days ago
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Java library to determine the offsets and lengths of metadata segments in a JPEG file.

• Host: GitHub
• URL: https://github.com/mike10004/jpeg-segment-finder
• Owner: mike10004
• License: apache-2.0
• Created: 2017-11-16T22:36:55.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2021-04-26T17:19:57.000Z (over 3 years ago)
• Last Synced: 2024-10-07T09:21:16.004Z (3 months ago)
• Language: Java
• Size: 211 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# jpeg-segment-finder

Java library to determine the offsets and lengths of metadata segments in 

a JPEG file. This library is intended to be small and not pull in a lot of

external dependencies. Use it if you want to *parse* JPEG metadata yourself

but don't want to *find* JPEG metadata yourself.

## Maven

    

        com.github.mike10004

        jpeg-segment-finder

        0.5

    

## Usage

Find IPTC segments marked by byte 0xED:

    JpegSegmentFinder finder = new JpegSegmentFinder();

    List segments;

    try (InputStream in = new FileInputStream(jpegFile)) {

        segments = finder.findSegments(in, Collections.singleton((byte) 0xED));

    }

    JpegSegmentSpec iptc = segments.get(0);

    byte[] jpegBytes = Files.readAllBytes(jpegFile.toPath());

    int from = (int) iptc.contentOffset;

    int to = from + (int) iptc.contentLength;

    byte[] segmentBytes = Arrays.copyOfRange(jpegBytes, from, to);

    // ...analyze those segments bytes as you please...

## Credits

Thank you to Drew Noakes for [metadata-extractor][metadata-extractor]. This 

library is a hack on some classes in that library. The test image is from 

that project's test resources.

[metadata-extractor]: https://github.com/drewnoakes/metadata-extractor