'R How to convert a byte in a raw vector into a ascii space

I am reading some very old files created by C code that consist of a header (ASCII) and then data. I use readBin() to get the header data. When I try to convert the header to a string it fails because there are 3 'bad' bytes. Two of them are binary 0 and the other binary 17 (IIRC).

How do I convert the bad bytes to ASCII SPACE? I've tried some versions of the below code but it fails.

      hd[hd == as.raw(0) | hd  == as.raw(0x17)] <- as.raw(32)

I'd like to replace each bad value with a space so I don't have to recompute all the fixed data locations in parsing the string derived from hd.

r character-encoding ascii

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'R How to convert a byte in a raw vector into a ascii space

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