add support for CBOR files (#598)

* add support for CBOR files

* format: gofmt has new formatting rules

internal/magic/binary.go

@@ -23,6 +23,8 @@ var (
 	Torrent = prefix([]byte("d8:announce"))
 	// PAR1 matches a parquet file.
 	Par1 = prefix([]byte{0x50, 0x41, 0x52, 0x31})
+	// CBOR matches a Concise Binary Object Representation https://cbor.io/
+	CBOR = prefix([]byte{0xD9, 0xD9, 0xF7})
 )
 
 // Java bytecode and Mach-O binaries share the same magic number.
@@ -156,11 +158,11 @@ func Marc(raw []byte, limit uint32) bool {
 // the GL transmission Format (glTF).
 // GLB uses little endian and its header structure is as follows:
 //
-// 	<-- 12-byte header                             -->
-// 	| magic            | version          | length   |
-// 	| (uint32)         | (uint32)         | (uint32) |
-// 	| \x67\x6C\x54\x46 | \x01\x00\x00\x00 | ...      |
-// 	| g   l   T   F    | 1                | ...      |
+//	<-- 12-byte header                             -->
+//	| magic            | version          | length   |
+//	| (uint32)         | (uint32)         | (uint32) |
+//	| \x67\x6C\x54\x46 | \x01\x00\x00\x00 | ...      |
+//	| g   l   T   F    | 1                | ...      |
 //
 // Visit [glTF specification] and [IANA glTF entry] for more details.
 //
@@ -172,14 +174,15 @@ var Glb = prefix([]byte("\x67\x6C\x54\x46\x02\x00\x00\x00"),
 // TzIf matches a Time Zone Information Format (TZif) file.
 // See more: https://tools.ietf.org/id/draft-murchison-tzdist-tzif-00.html#rfc.section.3
 // Its header structure is shown below:
-// 	+---------------+---+
-// 	|  magic    (4) | <-+-- version (1)
-// 	+---------------+---+---------------------------------------+
-// 	|           [unused - reserved for future use] (15)         |
-// 	+---------------+---------------+---------------+-----------+
-// 	|  isutccnt (4) |  isstdcnt (4) |  leapcnt  (4) |
-// 	+---------------+---------------+---------------+
-// 	|  timecnt  (4) |  typecnt  (4) |  charcnt  (4) |
+//
+//	+---------------+---+
+//	|  magic    (4) | <-+-- version (1)
+//	+---------------+---+---------------------------------------+
+//	|           [unused - reserved for future use] (15)         |
+//	+---------------+---------------+---------------+-----------+
+//	|  isutccnt (4) |  isstdcnt (4) |  leapcnt  (4) |
+//	+---------------+---------------+---------------+
+//	|  timecnt  (4) |  typecnt  (4) |  charcnt  (4) |
 func TzIf(raw []byte, limit uint32) bool {
 	// File is at least 44 bytes (header size).
 	if len(raw) < 44 {

supported_mimes.md

@@ -1,4 +1,4 @@
-## 176 Supported MIME types
+## 177 Supported MIME types
 This file is automatically generated when running tests. Do not edit manually.
 
 Extension | MIME type | Aliases
@@ -118,6 +118,7 @@ Extension | MIME type | Aliases
 **.mobi** | application/x-mobipocket-ebook | -
 **.lit** | application/x-ms-reader | -
 **.bpg** | image/bpg | -
+**.cbor** | application/cbor | -
 **.sqlite** | application/vnd.sqlite3 | application/x-sqlite3
 **.dwg** | image/vnd.dwg | image/x-dwg, application/acad, application/x-acad, application/autocad_dwg, application/dwg, application/x-dwg, application/x-autocad, drawing/dwg
 **.nes** | application/vnd.nintendo.snes.rom | -

tree.go

@@ -21,7 +21,7 @@ var root = newMIME("application/octet-stream", "",
 	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, mp4, webM,
 	avi, flv, mkv, asf, aac, voc, m3u, rmvb, gzip, class, swf, crx, ttf, woff,
-	woff2, otf, ttc, eot, wasm, shx, dbf, dcm, rar, djvu, mobi, lit, bpg,
+	woff2, otf, ttc, eot, wasm, shx, dbf, dcm, rar, djvu, mobi, lit, bpg, cbor,
 	sqlite3, dwg, nes, lnk, macho, qcp, icns, hdr, mrc, mdb, accdb, zstd, cab,
 	rpm, xz, lzip, torrent, cpio, tzif, xcf, pat, gbr, glb, cabIS, jxr, parquet,
 	// Keep text last because it is the slowest check.
@@ -261,4 +261,5 @@ var (
 	jxr     = newMIME("image/jxr", ".jxr", magic.Jxr).alias("image/vnd.ms-photo")
 	parquet = newMIME("application/vnd.apache.parquet", ".parquet", magic.Par1).
 		alias("application/x-parquet")
+	cbor = newMIME("application/cbor", ".cbor", magic.CBOR)
 )