Hey,

I've found an issue with new swf :

ArgumentError: negative argument
from /Users/Bob/apps/ugs/lib/imagespec/parser/swf.rb:54:in `*'

Thanks a lot for this library anyway!

When a JPEG contains a Exif header, the parser gets into troubles. This bug fix may solve the problem:

in JPEG.rb

  def self.detected?(stream)
    stream.rewind
    case stream.read(10)
      when /^\xff\xd8\xff\xe0\x00\x10JFIF/ then true
      when /^\xff\xd8\xff\xe1/ && /Exif$/  then true # bug fix, cannot do match *
      # when /^\xff\xd8\xff\xe1(.*){1}Exif/  then true
      else false
    end
  end

Got this with apache2 / passenger and ruby 1.8.6 and a 1.7 MB swf.

<RAILS_ROOT>/plugins/image_spec/lib/parsers/swf.rb:41: [BUG] Segmentation fault
ruby 1.8.6 (2008-03-03) [i686-linux]

The segfault happens here, at line 41 in swf.rb :

    # And reconstruct the stream contents to the first 8 bytes (header)
    # Plus our decompressed body
    contents = contents[0..7] + body

I think this is not really needed since following code does not use the header bytes anymore.
I fixed this in my own copy, but I'm sorry i'm not a regular git user, so I do not know how to commit my patch as for now.

Right now, any library that has a Parser module (like say, https://github.com/whitequark/parser) will collide with this gem.

ImageSpec's Parser module should be name-spaced to not collide with other modules name Parser. May I suggest ImageSpec::Parser?