OpenMetaΒΆ

OpenMeta is a C++ library for reading metadata safely across common image and media containers.

What it does today:

  • Scans files to locate metadata blocks (EXIF, XMP, ICC, IPTC, Photoshop IRB, MPF, comments, JUMBF/C2PA hints, and BMFF item-graph metadata).

  • Extracts and optionally decompresses block payloads (size-limited).

  • Decodes common blocks into a typed, normalized in-memory model: EXIF/TIFF-IFD tags, XMP properties, IPTC-IIM datasets, ICC profile header/tag tables, Photoshop IRB (8BIM) resource blocks, BMFF derived fields, and EXR header attributes.

  • Exposes sidecar dump paths (lossless and portable) and validation APIs/tools (metavalidate) with machine-readable issue codes for CI gating.

Read-path coverage snapshot:

  • Tracked HEIC/HEIF, CR3, and mixed RAW EXIF compare gates are passing.

  • EXR header metadata compare gate is passing for the documented contract.

  • MakerNote support is broad and baseline-gated; unknown tags remain lossless.

OpenMeta treats metadata as untrusted input and applies explicit limits and sanitization to reduce memory and output attack surface.