Byte swap on the output, as in the following: 

$ echo -n 'abcd' | dd conv=swab | hexdump -C
00000000  62 61 64 63                                       |badc|

It seems OP is requesting a ':bswap' io layer or somesuch. AFAIK there is none.

In reply to Re: Best way to read a file into memory and use normal operation on memory file? (byteswap) by Anonymous Monk
in thread Best way to read a file into memory and use normal operation on memory file? by james28909

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