Base64 decode data: Difference between revisions

<lang J>

using J's [https://github.com/jsoftware/convert_misc/blob/master/base64.ijs convert/misc/base64] script:

<lang> require'convert/misc/base64'

frombase64 'VG8gZXJyIGlzIGh1bWFuLCBidXQgdG8gcmVhbGx5IGZvdWwgdGhpbmdzIHVwIHlvdSBuZWVkIGEgY29tcHV0ZXIuCiAgICAtLSBQYXVsIFIuIEVocmxpY2g='

To err is human, but to really foul things up you need a computer.

-- Paul R. Ehrlich</lang>

Alternative implementation based on that script:

<lang J>

BASE64=: (a.{~ ,(a.i.'Aa') +/i.26),'0123456789+/'

frombase64=: {{

pad=. _2 >. (y i. '=') - #y

pad }. a. {~ #. _8 [\ , (6#2) #: BASE64 i. y

}}

</lang>