1 files changed, 47 insertions, 0 deletions
diff --git a/dataUriToBlob.js b/dataUriToBlob.js
new file mode 100644
index 0000000..582aecb
--- /dev/null
+++ b/dataUriToBlob.js
@@ -0,0 +1,47 @@
+window.dataUriToBlob = (function(){
+/**
+ * Blob constructor.
+ */
+
+var Blob = window.Blob;
+
+/**
+ * ArrayBufferView support.
+ */
+
+var hasArrayBufferView = new Blob([new Uint8Array(100)]).size == 100;
+
+/**
+ * Return a `Blob` for the given data `uri`.
+ *
+ * @param {String} uri
+ * @return {Blob}
+ * @api public
+ */
+
+var dataUriToBlob = function(uri){
+  var data = uri.split(',')[1];
+  var bytes = atob(data);
+  var buf = new ArrayBuffer(bytes.length);
+  var arr = new Uint8Array(buf);
+  for (var i = 0; i < bytes.length; i++) {
+    arr[i] = bytes.charCodeAt(i);
+  }
+
+  if (!hasArrayBufferView) arr = buf;
+  var blob = new Blob([arr], { type: mime(uri) });
+  blob.slice = blob.slice || blob.webkitSlice;
+  return blob;
+};
+
+/**
+ * Return data uri mime type.
+ */
+
+function mime(uri) {
+  return uri.split(';')[0].slice(5);
+}
+
+return dataUriToBlob;
+
+})()