Filemagick::Signatures

This module contains the signatures for use either independently or via the filemagick library. The various file signatures currently supported are taken from Gary Kessler's website

The signatures are stored in a YAML file in the following format:

- mime: 'application/pdf'
  extensions:
    - 'pdf'
  signatures:
    starting:
      offset: 0
      hexcodes:
        - '25504446'
    trailing:
      offset: 0
      hexcodes:
        - '0a2525454f46'
        - '0a2525454f460a'
        - '0d0a2525454f460d0a'
        - '0d2525454f460d'

• The files typically have a starting and a trailing signatures.
• The offset part is the number of bytes to ignore from the beginning in the case of starting signature and from the end in case of trailing signature. This will be a number.
• hexcodes key holds a list of possible signatures. The validation logic takes into account all the signatures and it will be a true case if the file has any one of the specified signatures.

If a new signature has to be added, then the details have to be specified in the same manner.

Installation

Add this line to your application's Gemfile:

gem 'filemagick-signatures'

And then execute:

$ bundle

Or install it yourself as:

$ gem install filemagick-signatures

Usage

Contributing

1. Fork it ( https://github.com/[my-github-username]/filemagick-signatures/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request