Hopefully working.

( FROM THE CAPSTONE README )

Capstone is a disassembly framework with the target of becoming the ultimate disasm engine for binary analysis and reversing in the security community.

Created by Nguyen Anh Quynh, then developed and maintained by a small community, Capstone offers some unparalleled features:

• Support multiple hardware architectures: ARM, ARM64 (aka ARMv8), Mips, X86, Sparc & SystemZ.

• Having clean/simple/lightweight/intuitive architecture-neutral API.

• Provide details on disassembled instruction (called “decomposer” by others).

• Provide semantics of the disassembled instruction, such as list of implicit registers read & written.

• Implemented in pure C language, with lightweight wrappers for C++, Python, Ruby, OCaml, C#, Java and Go available.

• Native support for Windows & *nix platforms (MacOSX, Linux & *BSD confirmed).

• Thread-safe by design.

• Distributed under the open source BSD license.

First install the capstone library from either https://github.com/aquynh/capstone or http://www.capstone-engine.org

Then (until we publish a gem) clone the repo, then do this:

gem build crabstone.gemspec
gem install crabstone-3.0.3.gem
rake test

Check the tests for more examples. Here is "Hello World":

require 'crabstone'
include Crabstone

arm = (
  "\xED\xFF\xFF\xEB\x04\xe0\x2d\xe5\x00\x00\x00\x00\xe0\x83\x22" <<
  "\xe5\xf1\x02\x03\x0e\x00\x00\xa0\xe3\x02\x30\xc1\xe7\x00\x00\x53\xe3"
)

begin
  
  cs = Disassembler.new(ARCH_ARM, MODE_ARM)
  puts "Hello from Capstone v #{cs.version.join('.')}!"
  puts "Disasm:"

  begin
    cs.disasm(arm, 0x1000).each {|i|
      printf("0x%x:\t%s\t\t%s\n",i.address, i.mnemonic, i.op_str)
    }
  rescue
    fail "Disassembly error: #{$!}"
  ensure
    cs.close
  end

rescue
  fail "Unable to open engine: #{$!}"
end

I test with JRuby >= 1.7.8, MRI >= 2.0.0. If it doesn't work with any of those it's a bug. If it doesn't work with like Rubinius or REE or 1.8 or whatever then "patches welcome". ( AFAIK it does, actually, work with rbx )

If you feel like chipping in, especially with better tests or examples, or (please!!) documentation, fork and send me a pull req.

Library Author: Nguyen Anh Quynh
Binding Authors: Nguyen Anh Quynh, Tan Sheng Di, Ben Nagy
License: BSD style - details in the LICENSE file
(c) 2013 COSEINC. All Rights Reserved.