Added support for JXS file format (#319)

* Added support for JXS file formats

* Revert formatting change made in #319

Co-authored-by: Gabriel Vasile <gabriel.vasile@email.com>

Author: V-R-Dighe

internal/magic/image.go

@@ -44,6 +44,8 @@ var (
 	Hdr = prefix([]byte("#?RADIANCE\n"))
 	// Xpm matches X PixMap image data.
 	Xpm = prefix([]byte{0x2F, 0x2A, 0x20, 0x58, 0x50, 0x4D, 0x20, 0x2A, 0x2F})
+	// Jxs matches a JPEG XS coded image file (ISO/IEC 21122-3).
+	Jxs = prefix([]byte{0x00, 0x00, 0x00, 0x0C, 0x4A, 0x58, 0x53, 0x20, 0x0D, 0x0A, 0x87, 0x0A})
 	// Jxr matches Microsoft HD JXR photo file.
 	Jxr = prefix([]byte{0x49, 0x49, 0xBC, 0x01})
 )

supported_mimes.md

@@ -46,6 +46,7 @@ Extension | MIME type | Aliases
 **.jp2** | image/jp2 | -
 **.jpf** | image/jpx | -
 **.jpm** | image/jpm | video/jpm
+**.jxs** | image/jxs | -
 **.gif** | image/gif | -
 **.webp** | image/webp | -
 **.exe** | application/vnd.microsoft.portable-executable | -

tree.go

@@ -18,7 +18,7 @@ import (
 var root = newMIME("application/octet-stream", "",
 	func([]byte, uint32) bool { return true },
 	xpm, sevenZ, zip, pdf, fdf, ole, ps, psd, p7s, ogg, png, jpg, jxl, jp2, jpx,
-	jpm, gif, webp, exe, elf, ar, tar, xar, bz2, fits, tiff, bmp, ico, mp3, flac,
+	jpm, jxs, gif, webp, exe, elf, ar, tar, xar, bz2, fits, tiff, bmp, ico, mp3, flac,
 	midi, ape, musePack, amr, wav, aiff, au, mpeg, quickTime, mqv, mp4, webM,
 	threeGP, threeG2, avi, flv, mkv, asf, aac, voc, aMp4, m4a, m3u, m4v, rmvb,
 	gzip, class, swf, crx, ttf, woff, woff2, otf, ttc, eot, wasm, shx, dbf, dcm, rar,
@@ -122,6 +122,7 @@ var (
 	jpx     = newMIME("image/jpx", ".jpf", magic.Jpx)
 	jpm     = newMIME("image/jpm", ".jpm", magic.Jpm).
 		alias("video/jpm")
+	jxs  = newMIME("image/jxs", ".jxs", magic.Jxs)
 	xpm  = newMIME("image/x-xpixmap", ".xpm", magic.Xpm)
 	bpg  = newMIME("image/bpg", ".bpg", magic.Bpg)
 	gif  = newMIME("image/gif", ".gif", magic.Gif)