Add support for Zstandard compressed file (#439)

* Add support for Zstandard compressed file

https://en.wikipedia.org/wiki/Zstandard

**Zstandard**

Filename extension:
.zst

Internet media type:
application/zstd

Magic number	:
28 b5 2f fd

Type of format	Data compression:
Standard	RFC 8478

Website:
https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md

* fix "Invalid number literal casing"

core.d.ts

@@ -137,7 +137,8 @@ declare namespace core {
 		| 'asar'
 		| 'stl'
 		| 'chm'
-		| '3mf';
+		| '3mf'
+		| 'zst';
 
 	type MimeType =
 		| 'image/jpeg'
@@ -268,7 +269,8 @@ declare namespace core {
 		| 'application/x-asar'
 		| 'model/stl'
 		| 'application/vnd.ms-htmlhelp'
-		| 'model/3mf';
+		| 'model/3mf'
+		| 'application/zstd';
 
 	interface FileTypeResult {
 		/**
@@ -376,4 +378,3 @@ declare namespace core {
 }
 
 export = core;
-

core.js

@@ -805,6 +805,13 @@ async function _fromTokenizer(tokenizer) {
 		};
 	}
 
+	if (check([0x28, 0xB5, 0x2F, 0xFD])) {
+		return {
+			ext: 'zst',
+			mime: 'application/zstd'
+		};
+	}
+
 	// -- 5-byte signatures --
 
 	if (check([0x4F, 0x54, 0x54, 0x4F, 0x00])) {

package.json

@@ -181,7 +181,8 @@
 		"asar",
 		"stl",
 		"chm",
-		"3mf"
+		"3mf",
+		"zst"
 	],
 	"devDependencies": {
 		"@types/node": "^13.1.4",

readme.md

@@ -297,6 +297,7 @@ Returns a set of supported MIME types.
 - [`rar`](https://en.wikipedia.org/wiki/RAR_(file_format)) - Archive file
 - [`gz`](https://en.wikipedia.org/wiki/Gzip) - Archive file
 - [`bz2`](https://en.wikipedia.org/wiki/Bzip2) - Archive file
+- [`zst`](https://en.wikipedia.org/wiki/Zstandard) - Archive file
 - [`7z`](https://en.wikipedia.org/wiki/7z) - 7-Zip archive
 - [`dmg`](https://en.wikipedia.org/wiki/Apple_Disk_Image) - Apple Disk Image
 - [`mp4`](https://en.wikipedia.org/wiki/MPEG-4_Part_14#Filename_extensions) - MPEG-4 Part 14 video file

supported.js

@@ -135,7 +135,8 @@ module.exports = {
 		'asar',
 		'stl',
 		'chm',
-		'3mf'
+		'3mf',
+		'zst'
 	],
 	mimeTypes: [
 		'image/jpeg',
@@ -266,6 +267,7 @@ module.exports = {
 		'application/x-asar',
 		'model/stl',
 		'application/vnd.ms-htmlhelp',
-		'model/3mf'
+		'model/3mf',
+		'application/zstd'
 	]
 };

test.js

@@ -99,6 +99,9 @@ const names = {
 	Z: [
 		'fixture.tar'
 	],
+	zst: [
+		'fixture.tar'
+	],
 	mkv: [
 		'fixture',
 		'fixture2'