From 68e17108b21a65a3544507c99133ddb4711f1efc Mon Sep 17 00:00:00 2001
From: Steve <steve23063@gmail.com>
Date: Mon, 1 May 2023 11:25:53 -0500
Subject: [PATCH] DataWorker.js from https://github.com/Stuk/jszip/pull/555

---
 lib/stream/DataWorker.js | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/lib/stream/DataWorker.js b/lib/stream/DataWorker.js
index ffb99bdd..38862fa8 100644
--- a/lib/stream/DataWorker.js
+++ b/lib/stream/DataWorker.js
@@ -28,7 +28,12 @@ function DataWorker(dataP) {
         self.data = data;
         self.max = data && data.length || 0;
         self.type = utils.getTypeOf(data);
-        if(!self.isPaused) {
+
+        if (self.type === 'blob') {
+            self.max = data.size;
+        }
+
+        if (!self.isPaused) {
             self._tickAndRepeat();
         }
     }, function (e) {
@@ -85,6 +90,7 @@ DataWorker.prototype._tick = function() {
         return false;
     }
 
+    var self = this;
     var size = DEFAULT_BLOCK_SIZE;
     var data = null, nextIndex = Math.min(this.max, this.index + size);
     if (this.index >= this.max) {
@@ -92,6 +98,22 @@ DataWorker.prototype._tick = function() {
         return this.end();
     } else {
         switch(this.type) {
+        case "blob":
+            var chunk = self.data.slice(this.index, nextIndex);
+            var reader = new FileReader();
+            self.pause();
+            self.index = nextIndex;
+            reader.onload = function(e) {
+                self.push({
+                    data : new Uint8Array(e.target.result),
+                    meta : {
+                        percent : self.max ? self.index / self.max * 100 : 0
+                    }
+                });
+                self.resume();
+            };
+            reader.readAsArrayBuffer(chunk);
+            return;
         case "string":
             data = this.data.substring(this.index, nextIndex);
             break;