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v2.2.5 — DICOMDIR navigation offsets (cross-reader interop)

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@SureshKViswanathan SureshKViswanathan released this 09 Jul 08:56
· 63 commits to main since this release
v2.2.5
7019479

DICOMDIRWriter now computes the DICOMDIR navigation offsets it previously left as 0, so file-sets it writes are navigable by strict offset-following readers (pydicom FileSet, dcmtk), not only DICOMKit's own offset-tolerant reader.

  • Computes Offset of the First/Last Directory Record (0004,1200/1202) and each record's Offset of Next Directory Record (0004,1400) / Offset of Referenced Lower-Level Directory Entity (0004,1420) — absolute file offsets to each record's (FFFE,E000) item tag (PS3.3 F.3.2.2).
  • Two-pass encode: measure item byte positions with zero offsets, then re-encode with the real values (each a fixed 4-byte UL → byte-identical layout). File meta is generated once and reused across both passes (its fresh SOP Instance UID length would otherwise shift item positions).
  • Verified against pydicom.fileset.FileSet (previously KeyError; now reads a DICOMKit multi-series DICOMDIR) + a self-contained byte-offset oracle.

Fixes the interoperability limitation noted for DICOMDIR media export.

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