FileSig: Detect Filetypes Using Only Magic Numbers in Pure Haskell

Pure Haskell library to determine a file's type without relying on its name/extension (by using its file signature (AKA "magic number").

Thanks to @qti3e for supplying the initial database in JSON from this Gist list of file signatures.

It does not rely on file extensions at all.

For a full list of file types supported (>=150!) in the database, please see data/magic.json.

Examples

See if a file has a signature by supplying a file path and an extension. Note that it doesn't use the extension to check, the extension is merely used to specify the file type magic number to use.

>>> hasSignature "foo/myrichtext" "rtf"
True

To check if, wand which, file type a file matches in the database:

>>> signatureMatch "foo/bar/story"
Just "doc"

Running tests

cabal test