B64 into HL7 message has CRLF every 77 characters

[fujidave]

Trying to add a B64 encoded jpeg into an outbound HL7 message results in a CRLF being inserted after every 77 characters of the B64 blob. The B64 data looks fine inthe channel map and tests OK in a B64 decoder but something in the HL7 output is breaking it with these repeated CFLF's.
This issue and question has been answered before in the old forum but the link to the answer is no longer working :(

https://forums.mirthproject.io/forum/mirth-connect/support/3389-converting-pdf-file-to-an-encoded-base64-blob

Any help would be much appreciated as I'm struggling to find the fix for this issue. Mirth channel is attached.

Dicom Snapshot HL7 to LIS.xml

------------ sorry to update this discussion, further checking the channel map data shows that the result of this function already has the line breaks after 77 characters, but why?

var B64jpg = DICOMUtil.convertDICOM('imagetype', connectorMessage)

[pacmano1]

See https://github.com/OpenIntegrationEngine/engine/blob/main/donkey/src/main/java/com/mirth/connect/donkey/util/Base64Util.java, which is what ultimately is used.

So just remove the line break, e.g. .replaceAll("\r\n","")

[fujidave]

Many thanks for the response and yes that did work. I had tried using the replace.All but with something like this - str.replace(/[\n\r]/g, '') and couldn't get it to work, so frustratingly close.
I have another similar channel reading a jpg file and inserting the encoded B64 data into HL7 message, and again that had the same issue. Just reading the file into the channel encodes it, but again split into 77 char chunks. Great I thought, same fix. But no, I got the "Javascript .replaceAll() is not a function type error" and had to revert to using the str.replace function with regex operators.
I sadly don't begin to comprehend the complexites behind all this, the downside of being an electrical engineer and learning coding and javascript on the fly and as required, but apprecaite those that do and their help!

[pacmano1]

You are mixing Java and JavaScript, that's all.

AI is usually good about helping you on this one. Just make sure you're telling it that you're using rhino JavaScript in mirth connect when you ask questions.