Fix false-positive in ARW detection (#251)

sindresorhus · Oct 22, 2019 · f379c5b · f379c5b
1 parent 2f69644
commit f379c5b
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Showing 3 changed files with 5 additions and 4 deletions.
diff --git a/fixture/fixture5.arw b/fixture/fixture5.arw
diff --git a/index.js b/index.js
@@ -119,9 +119,9 @@ const fileType = input => {
 
 	if (
 		check([0x49, 0x49, 0x2A, 0x00]) &&
-		(check([0x10, 0xFB, 0x86, 0x01], {offset: 4}) ||
-		check([0x08, 0x00, 0x00, 0x00, 0x13, 0x00], {offset: 4}) ||
-		check([0x08, 0x00, 0x00, 0x00, 0x12, 0x00], {offset: 4}))
+		(check([0x10, 0xFB, 0x86, 0x01], {offset: 4}) || check([0x08, 0x00, 0x00, 0x00], {offset: 4})) &&
+		// This pattern differentiates ARW from other TIFF-ish file types:
+		check([0x00, 0xFE, 0x00, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x01], {offset: 9})
 	) {
 		return {
 			ext: 'arw',

diff --git a/test.js b/test.js
@@ -25,7 +25,8 @@ const names = {
 		'fixture',
 		'fixture2',
 		'fixture3',
-		'fixture4'
+		'fixture4',
+		'fixture5'
 	],
 	dng: [
 		'fixture',