magic

Documentation

Overview

Package magic implements MIME type sniffing of data based on the well-known "magic" number prefixes in the file.

Index

• func MIMEType(hdr []byte) string
• func MIMETypeFromReader(r io.Reader) (mime string, reader io.Reader)
• func MIMETypeFromReaderAt(ra io.ReaderAt) (mime string)

Functions

func MIMEType

func MIMEType(hdr []byte) string

MIMEType returns the MIME type from the data in the provided header of the data. It returns the empty string if the MIME type can't be determined.

func MIMETypeFromReader

func MIMETypeFromReader(r io.Reader) (mime string, reader io.Reader)

MIMETypeFromReader takes a reader, sniffs the beginning of it, and returns the mime (if sniffed, else "") and a new reader that's the concatenation of the bytes sniffed and the remaining reader.

func MIMETypeFromReaderAt

func MIMETypeFromReaderAt(ra io.ReaderAt) (mime string)

MIMETypeFromReader takes a ReaderAt, sniffs the beginning of it, and returns the MIME type if sniffed, else the empty string.