Dictionary media import improvements (#1926)

* Add base64ToArrayBuffer to StringUtil

* Remove unnecessary media-util.js import

* Run async requirements in serial rather than parallel

* Update API.getMedia handler to convert ArrayBuffer content to base64

* Rename getImageResolution to getImageDetails

* Change parameter order of getImageDetails

* Pre-process and store media as an ArrayBuffer

* Remove MediaUtil.createBlobFromBase64Content

* Fix Anki media injection

1 files changed, 15 insertions, 0 deletions

diff --git a/ext/js/data/sandbox/string-util.js b/ext/js/data/sandbox/string-util.js
index 37e021c9..b523c39d 100644
--- a/ext/js/data/sandbox/string-util.js
+++ b/ext/js/data/sandbox/string-util.js
@@ -58,4 +58,19 @@ class StringUtil {
             return binary;
         }
     }
+
+    /**
+     * Converts a base64 string to an ArrayBuffer.
+     * @param content The binary content string encoded in base64.
+     * @returns A new `ArrayBuffer` object corresponding to the specified content.
+     */
+    static base64ToArrayBuffer(content) {
+        const binaryContent = atob(content);
+        const length = binaryContent.length;
+        const array = new Uint8Array(length);
+        for (let i = 0; i < length; ++i) {
+            array[i] = binaryContent.charCodeAt(i);
+        }
+        return array.buffer;
+    }
 }