Handle audio and video files

src/utils/exportUtils/StreamToZip.ts

@@ -0,0 +1,17 @@
+/*Not to be reviewed now*/
+class fileCheckSum {
+    protected CRC32: number;
+    public table: any[];
+    constructor() {
+        this.CRC32 = -1
+    }
+
+    protected append(data: any[]) {
+        let crc = this.CRC32 | 0;
+        const table = this.table;
+        for (let offset = 0, len = data.length | 0; offset < len; offset++) {
+            crc = (crc >>> 8) ^ table[(crc ^ data[offset]) & 0xFF]
+        }
+        this.CRC32 = crc
+    }
+}