1 files changed, 48 insertions, 0 deletions
diff --git a/browser/extensions/screenshots/blobConverters.js b/browser/extensions/screenshots/blobConverters.js
new file mode 100644
index 0000000000..f2312251d7
--- /dev/null
+++ b/browser/extensions/screenshots/blobConverters.js
@@ -0,0 +1,48 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+this.blobConverters = (function() {
+  const exports = {};
+
+  exports.dataUrlToBlob = function(url) {
+    const binary = atob(url.split(",", 2)[1]);
+    let contentType = exports.getTypeFromDataUrl(url);
+    if (contentType !== "image/png" && contentType !== "image/jpeg") {
+      contentType = "image/png";
+    }
+    const data = Uint8Array.from(binary, char => char.charCodeAt(0));
+    const blob = new Blob([data], {type: contentType});
+    return blob;
+  };
+
+  exports.getTypeFromDataUrl = function(url) {
+    let contentType = url.split(",", 1)[0];
+    contentType = contentType.split(";", 1)[0];
+    contentType = contentType.split(":", 2)[1];
+    return contentType;
+  };
+
+  exports.blobToArray = function(blob) {
+    return new Promise((resolve, reject) => {
+      const reader = new FileReader();
+      reader.addEventListener("loadend", function() {
+        resolve(reader.result);
+      });
+      reader.readAsArrayBuffer(blob);
+    });
+  };
+
+  exports.blobToDataUrl = function(blob) {
+    return new Promise((resolve, reject) => {
+      const reader = new FileReader();
+      reader.addEventListener("loadend", function() {
+        resolve(reader.result);
+      });
+      reader.readAsDataURL(blob);
+    });
+  };
+
+  return exports;
+})();
+null;