From 11b74147ee67944c1707b4cc0b4db1cedc73aacc Mon Sep 17 00:00:00 2001
From: Greg Wainer <gregcebowainer@hotmail.com>
Date: Fri, 19 Jul 2024 17:39:04 -0500
Subject: [PATCH] Fix/webp exif little endian (#4061)

* Fix for isLittleEndian flag in parseExifData.

* Add break after reading first exif chunk in getWebpMetadata.
---
 web/scripts/pnginfo.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/web/scripts/pnginfo.js b/web/scripts/pnginfo.js
index 2c03cf74..8b1b2c61 100644
--- a/web/scripts/pnginfo.js
+++ b/web/scripts/pnginfo.js
@@ -49,7 +49,7 @@ export function getPngMetadata(file) {
 
 function parseExifData(exifData) {
 	// Check for the correct TIFF header (0x4949 for little-endian or 0x4D4D for big-endian)
-	const isLittleEndian = new Uint16Array(exifData.slice(0, 2))[0] === 0x4949;
+	const isLittleEndian = String.fromCharCode(...exifData.slice(0, 2)) === "II";
 
 	// Function to read 16-bit and 32-bit integers from binary data
 	function readInt(offset, isLittleEndian, length) {
@@ -134,6 +134,7 @@ export function getWebpMetadata(file) {
 						let index = value.indexOf(':');
 						txt_chunks[value.slice(0, index)] = value.slice(index + 1);
 					}
+					break;
 				}
 
 				offset += 8 + chunk_length;