magic

Toolkit for detecting and verifying file type using magic bytes in pure Go

Support for all file signatures listed here.

You only need to provide the first few hundred bytes of a given file to detect the file type, unless you want to detect .iso images, which require examination of the first 32774 bytes.

A description and a suggested file extension are provided where relevant, and MIME types will be added in future.

Example Usage

package main

import "github.com/liamg/magic"

func main() {

    data := []byte{0xa1, 0xb2, 0xc3, 0xd4, 0x00, 0x00, 0x00, 0x00}

    fileType, err := magic.Lookup(data)
    if err != nil {
        if err == magic.ErrUnknown {
            fmt.Println("File type is unknown")
            os.Exit(1)
        }else{
            panic(err)
        }
    }

    fmt.Printf("File extension:        %s\n", fileType.Extension)
    fmt.Printf("File type description: %s\n", fileType.Description)
}