From: Joey <rubytalk@...>
Date: 2006-08-17T16:20:19+09:00
Subject: Re: Ruby Compressor (little long)

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This:
File.open(__FILE__, "rb") do |data|
 # skip to the end
 line = data.gets until line =~ /^__END__$/
 f = Marshal.load(data)
 eval(Zlib::Inflate.inflate(f[:init]))
 Kernel.zlib_requires = f
 eval(Zlib::Inflate.inflate(f[:main]))
end
__END__

Can be changed to:
f = Marshal.load(DATA.read)
 eval(Zlib::Inflate.inflate(f[:init]))
 Kernel.zlib_requires = f
 eval(Zlib::Inflate.inflate(f[:main]))
end
__END__

On 8/17/06, Patrick Hurley <phurley@gmail.com> wrote:
>
> I have need to distribute applications to customers. The customers
> have every right to the source code, but when it is installed we do
> not want the code to be easily visible. We are not worried about super
> hackers (or even moderately strong Ruby programmers :-), we just do
> not want our raw source code on the system calling out to be played
> with by the end users.
>
> To this end, I have developed this very simple script, which I plan on
> further refining. I know there are many rough edges, but I wanted to
> see if anyone else was interested in the code (or had any other
> suggestions), before I went any further.
>
> require "zlib"
>
> @init = <<ZLIB_REQUIRE
> module Kernel
>   alias default_require require
>   @@zlib_requires = {}
>
>   def zlib_requires=(zr)
>     @@zlib_requires = zr
>   end
>
>   def require(path)
>     return false if $".include?(path)
>
>     if @@zlib_requires.has_key(path)
>       eval(Zlib::Inflate.inflate(@@zlib_requires[path]))
>       $" << path
>     else
>       default_require path
>     end
>   end
>
> end
> ZLIB_REQUIRE
>
> @bootstrap = <<BOOTSTRAP
> require "zlib"
> File.open(__FILE__, "rb") do |data|
>   # skip to the end
>   line = data.gets until line =~ /^__END__$/
>   f = Marshal.load(data)
>   eval(Zlib::Inflate.inflate(f[:init]))
>   Kernel.zlib_requires = f
>   eval(Zlib::Inflate.inflate(f[:main]))
> end
> __END__
> BOOTSTRAP
>
> def findrb(fname)
>   $:.each do |path|
>     fp = File.join(path, fname)
>     return fp if File.exists? fp
>   end
>   false
> end
>
> def compress(script)
>   files = {}
>   load(script) rescue nil
>
>   $".each do |fname|
>     if (File.extname(fname) == ".rb") && (fp = findrb(fname))
>       data = IO.read(fp)
>       files[fname] = Zlib::Deflate.deflate(data, Zlib::BEST_COMPRESSION)
>     end
>   end
>
>   files[:main] = Zlib::Deflate.deflate(IO.read(script),
> Zlib::BEST_COMPRESSION)
>   files[:init] = Zlib::Deflate.deflate(@init, Zlib::BEST_COMPRESSION)
>
>   File.open("compress-#{script}", "wb") do |io|
>     io.print @bootstrap
>     io.write(Marshal.dump(files))
>   end
>
>   # write header data - fname,
> end
>
> compress(ARGV[0])
>
>

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