Decode hexadecimal string in Ruby [duplicate]

Question

Possible Duplicate:
Hex to binary in ruby

In Python, I can do the following:

>>> str = '000E0000000000'
>>> str.decode('hex')
'\x00\x0e\x00\x00\x00\x00\x00'

If I have to achieve the same output in ruby which call could I make? I tried to_s(16), which doesn't seem to work. I need the output to be in that specific format, so I expect to get the following:

"\\x00\\x0e\\x00\\x00\\x00\\x00\\x00"

Perhaps this is the solution? [stackoverflow.com/questions/84421/… [1]: stackoverflow.com/questions/84421/… — René Höhle
– René Höhle, Commented Mar 30, 2012 at 13:37

Niklas B. · Accepted Answer · 2012-03-30 13:52:32Z

13

irb(main):002:0> [str].pack('H*')
# => "\x00\x0E\x00\x00\x00\x00\x00"

Or (Ruby 1.9 only):

irb(main):004:0> str.scan(/../).map(&:hex).map(&:chr).join
# => "\x00\x0E\x00\x00\x00\x00\x00"

If you need the string formatted:

irb(main):005:0> s = str.scan(/../).map { |c| "\\x%02x" % c.hex }.join
=> "\\x00\\x0e\\x00\\x00\\x00\\x00\\x00"
irb(main):006:0> puts s
\x00\x0e\x00\x00\x00\x00\x00
=> nil

edited Mar 30, 2012 at 13:52

answered Mar 30, 2012 at 13:40

Niklas B.

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5 Comments

Pavan K Over a year ago

i get => "\000\016\000\000\000\000\000" for your solution I am running 1.8.7 ruby

Niklas B. Over a year ago

@Pavan: Which is correct, seeing that "\000\016" == "\x00\x0e"

Pavan K Over a year ago

trouble is I need to get the \x00 format and not \000 format as the url receiver is complaining of invalid format whereas the python decode prints \x00 format and the url receiver doesn't complain for that

Niklas B. Over a year ago

@Pavan: That's a formatting issue. What you want then is a string like "\\x00\\x0e...". Lemme hack that up really quick.

Niklas B. Over a year ago

@Pavan: Check my edit. Also, I edited your question to reflect your additional problem.

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