add jxr support #155 (#312)

* add jxr support

* test passing

* changes suggest

* Fix small typo in comment

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

Author: dijotmathews

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})
+	// Jxr matches Microsoft HD JXR photo file.
+	Jxr = prefix([]byte{0x49, 0x49, 0xBC, 0x01})
 )
 
 func jpeg2k(sig []byte) Detector {

mimetype_test.go

@@ -93,6 +93,7 @@ var files = map[string]string{
 	"jpg.jpg":            "image/jpeg",
 	"jpm.jpm":            "image/jpm",
 	"jxl.jxl":            "image/jxl",
+	"jxr.jxr":            "image/jxr",
 	"xpm.xpm":            "image/x-xpixmap",
 	"js.js":              "application/javascript",
 	"json.json":          "application/json",

supported_mimes.md

@@ -1,4 +1,4 @@
-## 171 Supported MIME types
+## 172 Supported MIME types
 This file is automatically generated when running tests. Do not edit manually.
 
 Extension | MIME type | Aliases
@@ -139,6 +139,7 @@ Extension | MIME type | Aliases
 **.glb** | model/gltf-binary | -
 **.avif** | image/avif | -
 **.cab** | application/x-installshield | -
+**.jxr** | image/jxr | image/vnd.ms-photo
 **.txt** | text/plain | -
 **.html** | text/html | -
 **.svg** | image/svg+xml | -

testdata/jxr.jxr

@@ -24,7 +24,7 @@ var root = newMIME("application/octet-stream", "",
 	gzip, class, swf, crx, ttf, woff, woff2, otf, ttc, eot, wasm, shx, dbf, dcm, rar,
 	djvu, mobi, lit, bpg, sqlite3, dwg, nes, lnk, macho, qcp, icns, heic,
 	heicSeq, heif, heifSeq, hdr, mrc, mdb, accdb, zstd, cab, rpm, xz, lzip,
-	torrent, cpio, tzif, xcf, pat, gbr, glb, avif, cabIS,
+	torrent, cpio, tzif, xcf, pat, gbr, glb, avif, cabIS, jxr,
 	// Keep text last because it is the slowest check
 	text,
 )
@@ -255,4 +255,5 @@ var (
 	gbr     = newMIME("image/x-gimp-gbr", ".gbr", magic.Gbr)
 	xfdf    = newMIME("application/vnd.adobe.xfdf", ".xfdf", magic.Xfdf)
 	glb     = newMIME("model/gltf-binary", ".glb", magic.Glb)
+	jxr     = newMIME("image/jxr", ".jxr", magic.Jxr).alias("image/vnd.ms-photo")
 )