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DICOM files specify a "transfer syntax" which defines the image compression format, the encoding rules for the entire file, and any special-case encoding rules for particular fields. Many transfer syntaxes have common design features, but a transfer syntax is allowed to use completely custom encoding rules, and need not be publicly documented. Explicitly reject transfer syntaxes we know we don't support: implicit VR (uncommon), explicit VR big-endian (deprecated), deflate-compressed. In all other cases, follow some general rules and hope it works out. The large lookup functions were generated by a script, but I haven't included the code here, since its input is hand-massaged data copied from HTML tables. Add a JPEG WSI test case from the WG26 2021 hackathon (CC0 license) and a synthetic LE Explicit VLP case produced with img2dcm.