Ruby FFI wrapper to the “magic” library, that determines content type and encoding of files and strings. The library does three types of tests: filesystem tests, magic number tests, and language tests. The first test that succeeds causes the file type to be returned. Installation
gem install magic --source http://gemcutter.org
Install magic library using your package manager, e.g.:
sudo apt-get install file
If you don’t have libmagic.1.dylib file in your system, you need to install it via port command:
sudo port install file
Or for homebrew:
brew install libmagic
Sometimes you also need to set your DYLD_FALLBACK_LIBRARY_PATH environment variable to the directory where the libmagic.1.dylib is:
export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib
Install File for Windows. You also need to set your PATH environment variable to the directory where the magic1.dll is:
set PATH=C:\Program Files\GnuWin32\bin;%PATH%
It might be also required to add database option explicitly:
Magic.guess_string_mime( "Magic® File™", :database => 'C:\Program Files\GnuWin32\share\misc\magic.mgc' )
require "magic" Magic.guess_file_mime("public/images/rails.png") # => "image/png; charset=binary" Magic.guess_file_mime_encoding("public/images/rails.png") # => "binary" Magic.guess_file_mime_type("public/images/rails.png") # => "image/png" Magic.guess_string_mime("Magic® File™") # => "text/plain; charset=utf-8" Magic.guess_string_mime_encoding("Magic® File™") # => "utf-8" Magic.guess_string_mime_type("Magic® File™") # => "text/plain" Magic.guess(:mime_type, :database => "/etc/magic") { |db| db.buffer("Magic® File™") } # => "text/plain"
Copyright © 2010 Jakub Kuźma. See LICENSE for details.