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dcmjs-org / dcmjs

Javascript implementation of DICOM manipulation
https://dcmjs.netlify.com/
MIT License
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Other double as explicit value representation #399

Closed craigberry1 closed 1 month ago

craigberry1 commented 1 month ago

Add reserved 2 byte padding to OtherDouble read logic and read value length as 32 bit integer per spec.

Specifically section 7.1.2 that states: for VRs of AE, AS, AT, CS, DA, DS, DT, FL, FD, IS, LO, LT, PN, SH, SL, SS, ST, TM, UI, UL and US the Value Length Field is the 16-bit unsigned integer following the two byte VR Field. The value of the Value Length Field shall equal the length of the Value Field.

Meaning OD should be treated as: for all other VRs the 16 bits following the two byte VR Field are reserved for use by later versions of the DICOM Standard. These reserved bytes shall be set to 0000H and shall not be used or decoded. The Value Length Field is a 32-bit unsigned integer.

craigberry1 commented 1 month ago

Not doing this causes data elements after the first OD tag to be corrupted. This means reading and writing a file with OD will not produce a valid DICOM file:

image

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pieper commented 1 month ago

Thanks for working on this 👍

Even though it's a small file, let's put it in as a data release asset for consistency. Can you update the test, remove the dcm file and update the PR?

https://github.com/dcmjs-org/data/releases/tag/od-encoding-data

craigberry1 commented 1 month ago

Thanks for working on this 👍

Even though it's a small file, let's put it in as a data release asset for consistency. Can you update the test, remove the dcm file and update the PR?

https://github.com/dcmjs-org/data/releases/tag/od-encoding-data

Done 👍

github-actions[bot] commented 3 weeks ago

:tada: This PR is included in version 0.34.0 :tada:

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