scratch
//js/Base64ToBlob.js |
@@ -0,0 +1,21 @@ |
// Converts base64 to blob. |
function base64toBlob(base64Data, contentType) { |
contentType = contentType || ''; |
var sliceSize = 1024; |
var byteCharacters = atob(base64Data); |
var bytesLength = byteCharacters.length; |
var slicesCount = Math.ceil(bytesLength / sliceSize); |
var byteArrays = new Array(slicesCount); |
|
for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) { |
var begin = sliceIndex * sliceSize; |
var end = Math.min(begin + sliceSize, bytesLength); |
|
var bytes = new Array(end - begin); |
for (var offset = begin, i = 0 ; offset < end; ++i, ++offset) { |
bytes[i] = byteCharacters[offset].charCodeAt(0); |
} |
byteArrays[sliceIndex] = new Uint8Array(bytes); |
} |
return new Blob(byteArrays, { type: contentType }); |
} |