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Programming language: Go
Tags: Utilities    
Latest version: v1.1.0

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README

mimemagic

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Powerful and versatile MIME sniffing package using pre-compiled glob patterns, magic number signatures, xml document namespaces, and tree magic for mounted volumes, generated from the XDG shared-mime-info database.

Features

  • All in native go, no outside dependencies/C library bindings
  • 1003 MIME types, with a description, an acronym (where available), common aliases, extensions, icons, and subclasses
  • 493 magic signature tests (comprising of 1147 individual patterns), featuring range searches and bit masks, as per the xdg specification
  • 1099 glob patterns, for filename-based matching
  • 11 Tree Magic signatures and 28 XML namespace/local name pairs, offered for completeness' sake.
  • Included is the xml file parser to generate your own MIME definitions
  • Also included is a CLI based on this library that is fully featured and blazing-fast, beating the native 'file' and KDE's 'kmimetypefinder' in performance
  • Cross-platform support

Installation

The library:

go get github.com/zRedShift/mimemagic

The CLI:

go get github.com/zRedShift/mimemagic/cmd/mimemagic

API

See the Godoc reference, and cmd/mimemagic for an example implementation.

Usage

The library:

package main

import (
    "fmt"
    "github.com/zRedShift/mimemagic"
    "strings"
)

func main() {
    // Ignoring Read errors that might arise
    mimeType, _ := mimemagic.MatchFilePath("sample.svgz", -1)

    // image/svg+xml-compressed
    fmt.Println(mimeType.MediaType())

    // compressed SVG image
    fmt.Println(mimeType.Comment)

    // SVG (Scalable Vector Graphics)
    fmt.Printf("%s (%s)\n", mimeType.Acronym, mimeType.ExpandedAcronym)

    // application/gzip
    fmt.Println(strings.Join(mimeType.SubClassOf, ", "))

    // .svgz
    fmt.Println(strings.Join(mimeType.Extensions, ", "))

    // This is an image.
    switch mimeType.Media {
    case "image":
        fmt.Println("This is an image.")
    case "video":
        fmt.Println("This is a video file.")
    case "audio":
        fmt.Println("This is an audio file.")
    case "application":
        fmt.Println("This is an application.")
    default:
        fmt.Printf("This is a(n) %s.", mimeType.Media)
    }

    // true
    fmt.Println(mimeType.IsExtension(".svgz"))
}

The CLI:

Usage: mimemagic [options] <file> ...
Determines the MIME type of the given file(s).

Options:
  -c    Determine the MIME type of the file(s) using only its content.
  -f    Determine the MIME type of the file(s) using only the file name. Does
        not check for the file's existence. The -c
         flag takes precedence.
  -i    Output the MIME type in a human readable format.
  -l int
        The number of bytes from the beginning of the file mimemagic will
        examine. Reads the entire file if set to a negative value. By default
        mimemagic will only read the first 512 from stdin, however setting this
        flag to a non-default negative value will override this. (default -1)
  -t    Determine the MIME type of the directory/mounted volume using tree
        magic. Can't be used in conjunction with with -c, -f or -x.
  -x    Determine the MIME type of the xml file(s) using the local names and
        namespaces within. Can't be used in conjunction with -c, -f or -t.

Arguments:
  file
        The file(s) to test. '-' to read from stdin. If '-' is set, all other
        inputs will be ignored.

Examples:
  $ mimemagic -c sample.svgz
        application/gzip
  $ mimemagic *.svg*
        Olympic_rings_with_transparent_rims.svg: image/svg+xml
        Piano.svg.png: image/png
        RAID_5.svg: image/svg+xml
        sample.svgz: image/svg+xml-compressed
  $ cat /dev/urandom | mimemagic -
        application/octet-stream
  $ ls software; mimemagic -i -t software/
        autorun
        UNIX software

Benchmarks

See Benchmarks. For Match(), the average across over 400 completely different files (representing a unique MIME type each) is 13 ± 7 μs/op. For MatchGlob() it's 900 ± 200 ns/op, and for 12 ± 7 μs/op MatchMagic().