CODEWITHSUNDEEP
ruby
Lars Kakavandi-Nielsen
Lars Kakavandi-Nielsen

Reputation: 2198

How to avoid writing \n to file

I have the following minimal ruby script to test base64 encoding

require "base64"

data = "testkjadlskjflkasjfwe08u185u12w3oqew,dmf.smxa"
path = "./example/ruby_data.bin"

encoded = Base64.encode64 data

puts encoded 
open(path, "wb") do |file|
  file << encoded
end

However, I have the issue when I read the file in for instance C++, Ruby, or Python there is a newline at the end of the string. I would like to avoid that. How can I do this?

Upvotes: 0

Views: 81

Answers (1)

3limin4t0r
3limin4t0r

Reputation: 21110

The line feed is generated as part of the encoding process of Base64.encode64.

encode64(bin)

Returns the Base64-encoded version of bin. This method complies with RFC 2045. Line feeds are added to every 60 encoded characters.

require 'base64'
Base64.encode64("Now is the time for all good coders\nto learn Ruby")

Generates:

Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g
UnVieQ==

There is also Base64.strict_encode64 which doesn't add any line feeds.

strict_encode64(bin)

Returns the Base64-encoded version of bin. This method complies with RFC 4648. No line feeds are added.

data = "testkjadlskjflkasjfwe08u185u12w3oqew,dmf.smxa"
Base64.encode64 data
#=> "dGVzdGtqYWRsc2tqZmxrYXNqZndlMDh1MTg1dTEydzNvcWV3LGRtZi5zbXhh\n"
Base64.strict_encode64 data
#=> "dGVzdGtqYWRsc2tqZmxrYXNqZndlMDh1MTg1dTEydzNvcWV3LGRtZi5zbXhh"

With the line feed(s) removed from the encoded string it is also not written to the file.

Upvotes: 2

Related Questions