From 7fbf110949ab5fa5af1910d12171e204eacbfc6c Mon Sep 17 00:00:00 2001
From: Borewit <Borewit@users.noreply.github.com>
Date: Wed, 11 Dec 2024 22:25:10 +0100
Subject: [PATCH] Add support for `.drc`, Google's Draco 3D Data Compression

Resolves: #427
---
 core.js                     |   7 +++++++
 fixture/fixture-cube_pc.drc | Bin 0 -> 224 bytes
 package.json                |   3 ++-
 readme.md                   |   1 +
 supported.js                |   2 ++
 test.js                     |   3 +++
 6 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 fixture/fixture-cube_pc.drc

diff --git a/core.js b/core.js
index 7587100a..53e5eb8a 100644
--- a/core.js
+++ b/core.js
@@ -1056,6 +1056,13 @@ export class FileTypeParser {
 			};
 		}
 
+		if (this.checkString('DRACO')) {
+			return {
+				ext: 'drc',
+				mime: 'application/vnd.google.draco', // Invented by us
+			};
+		}
+
 		// -- 6-byte signatures --
 
 		if (this.check([0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00])) {
diff --git a/fixture/fixture-cube_pc.drc b/fixture/fixture-cube_pc.drc
new file mode 100644
index 0000000000000000000000000000000000000000..48396596411c31eab37da5d9e26334460fb9c473
GIT binary patch
literal 224
zcmZ<>a&-1*WMlvW2_R-<2C+CnBr_)yNC3=cVq#_hs{zSEK!ZIWBO_3lfnlPuEPp63
zKU91%^Kz%+85tEU1-lRacUlD!{cjH>khC}0^FXzRiiV0tit<3UhP?Z%&v2~YA=|*c
z6|4_rCKDGU12>4rXaFLCAe4127aN4hpej&X;@7~y!13p~{Repl1_cHNAn*Tw=KnyK
I{Ri3!0QtlqE&u=k

literal 0
HcmV?d00001

diff --git a/package.json b/package.json
index 0716b6e0..233c041e 100644
--- a/package.json
+++ b/package.json
@@ -217,7 +217,8 @@
 		"fbx",
 		"vsdx",
 		"vtt",
-		"apk"
+		"apk",
+		"drc"
 	],
 	"dependencies": {
 		"strtok3": "^10.0.0",
diff --git a/readme.md b/readme.md
index 48b35119..f6afa9c6 100644
--- a/readme.md
+++ b/readme.md
@@ -442,6 +442,7 @@ abortController.abort(); // Abort file-type reading from the Blob stream.
 - [`dmg`](https://en.wikipedia.org/wiki/Apple_Disk_Image) - Apple Disk Image
 - [`dng`](https://en.wikipedia.org/wiki/Digital_Negative) - Adobe Digital Negative image file
 - [`docx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Word document
+- [`drc`](https://en.wikipedia.org/wiki/Zstandard) - Google's Draco 3D Data Compression
 - [`dsf`](https://dsd-guide.com/sites/default/files/white-papers/DSFFileFormatSpec_E.pdf) - Sony DSD Stream File (DSF)
 - [`dwg`](https://en.wikipedia.org/wiki/.dwg) - Autodesk CAD file
 - [`elf`](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) - Unix Executable and Linkable Format
diff --git a/supported.js b/supported.js
index 25294cd9..4b6b55d7 100644
--- a/supported.js
+++ b/supported.js
@@ -154,6 +154,7 @@ export const extensions = [
 	'vsdx',
 	'vtt',
 	'apk',
+	'drc',
 ];
 
 export const mimeTypes = [
@@ -307,4 +308,5 @@ export const mimeTypes = [
 	'application/x.autodesk.fbx', // Invented by us
 	'application/vnd.visio',
 	'application/vnd.android.package-archive',
+	'application/vnd.google.draco',  // Invented by us
 ];
diff --git a/test.js b/test.js
index 4c2e8b81..f744b56e 100644
--- a/test.js
+++ b/test.js
@@ -54,6 +54,9 @@ const names = {
 	dng: [
 		'fixture-Leica-M10',
 	],
+	drc: [
+		'fixture-cube_pc',
+	],
 	epub: [
 		'fixture',
 		'fixture-crlf',