( 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 (ARMv8), Ethereum VM, M68K, Mips, MOS65XX, PPC, Sparc, SystemZ, TMS320C64X, M680X, XCore and X86 (including X86_64).

• 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 bindings for D, Clojure, F#, Common Lisp, Visual Basic, PHP, PowerShell, Emacs, Haskell, Perl, Python, Ruby, C#, NodeJS, Java, GO, C++, OCaml, Lua, Rust, Delphi, Free Pascal & Vala ready either in main code, or provided externally by the community.

• Native support for all popular platforms: Windows, Mac OSX, iOS, Android, Linux, *BSD, Solaris, etc.

• Thread-safe by design.

• Special support for embedding into firmware or OS kernel.

• High performance & suitable for malware analysis (capable of handling various X86 malware tricks).

• Distributed under the open source BSD license.

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

Then:

gem install crabstone

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

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

  begin
    cs.disasm(arm, 0x1000).each do |i|
      printf("0x%x:\t%s\t\t%s\n", i.address, i.mnemonic, i.op_str)
    end
  rescue Crabstone::Error => e
    raise "Disassembly error: #{e.message}"
  ensure
    cs.close
  end
rescue Crabstone::Error => e
  raise "Unable to open engine: #{e.message}"
end

Sample output (exact content may differ according to the Capstone engine version you are using):

Hello from Capstone v3.0!
Disasm:
0x1000: bl              #0xfbc
0x1004: str             lr, [sp, #-4]!
0x1008: andeq           r0, r0, r0
0x100c: str             r8, [r2, #-0x3e0]!
0x1010: mcreq           p2, #0, r0, c3, c1, #7
0x1014: mov             r0, #0
0x1018: strb            r3, [r1, r2]
0x101c: cmp             r3, #0

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, david942j
License: BSD style - details in the LICENSE file
(c) 2013 COSEINC. All Rights Reserved.