ffi

ffi

-- import "github.com/datatogether/ffi"

FFI - File Format identification is a package for making sensible guesses about file formats from Url strings. FFI is structured as a package to clear the way for future improvements.

The biggest avenue for improvement may be through integration with PRONOM: http://www.nationalarchives.gov.uk/PRONOM/Default.aspx#

PRONOM is a repository of file format signatures stored as XML. Currently the best tool for working with PRONOM is DROID, which is ill-suited to being run in web service oriented architectures.

As a suggested path for implementation, one could first focus on wrapping DROID in a service that invokes droid-cli with a given set of bytes. This would happen in a separate pacakge from this one. Later we could sit down & learn how to properly parse PRONOM xml signature files & do byte comparison, which could bue implemented in this package. Anyone investigating this avenue may wish to also review some of the work accomplished translating the PRONOM registry: http://the-fr.org

UPDATE 2017-04-24: looks like the File Information Tool Set from harvard may in fact be a better place to start: http://projects.iq.harvard.edu/fits/home

Usage

func ExtensionMimeType

func ExtensionMimeType(extenstion string) (string, error)

ExtensionMimeType returns a MIME-Type for a given file extension

func FilenameFromUrlString

func FilenameFromUrlString(rawUrl string) (string, error)

FilenameFromUrlString returns a file with extension if the url looks like it resolves to a filename, otherwise it returns an empty string

func FilenameMimeType

func FilenameMimeType(filename string) (string, error)

FilenameMimeType gives the mimetype of filename

func MimeType

func MimeType(io.Reader) (string, error)

MimeType from an io.Reader is the magic we seek

func MimeTypeExtension

func MimeTypeExtension(mimeType string) (string, error)

MimeTypeExtension returns an extension for a given MIME-type

func SetExtension

func SetExtension(filename, mimeType string) (string, error)

SetExtension strips any current extension from filename, replacing it with mimeType's corresponding extension