Here’s the one I’m using: #include <stdint.h> #include <stdlib.h> static char encoding_table[] = {‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘J’, ‘K’, ‘L’, ‘M’, ‘N’, ‘O’, ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’, ‘U’, ‘V’, ‘W’, ‘X’, ‘Y’, ‘Z’, ‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’, ‘h’, ‘i’, ‘j’, ‘k’, ‘l’, ‘m’, ‘n’, ‘o’, ‘p’, … Read more
If you want for some reason to convert your file to base-64 string. Like if you want to pass it via internet, etc… you can do this Byte[] bytes = File.ReadAllBytes(“path”); String file = Convert.ToBase64String(bytes); And correspondingly, read back to file: Byte[] bytes = Convert.FromBase64String(b64Str); File.WriteAllBytes(path, bytes);
You can use the Base64 Android class: String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT); You’ll have to convert your image into a byte array though. Here’s an example: Bitmap bm = BitmapFactory.decodeFile(“/path/to/image.jpg”); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); // bm is the bitmap object byte[] b = baos.toByteArray(); * Update * If you’re using an … Read more
Use Convert.TryFromBase64String from C# 7.2 public static bool IsBase64String(string base64) { Span<byte> buffer = new Span<byte>(new byte[base64.Length]); return Convert.TryFromBase64String(base64, buffer , out int bytesParsed); }
use following method to convert bitmap to byte array: ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream); byte[] byteArray = byteArrayOutputStream .toByteArray(); to encode base64 from byte array use following method String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
Here is an example, you can modify the method to accept a string parameter. Then just save the image object with image.Save(…). public Image LoadImage() { //data:image/gif;base64, //this image is a single pixel (black) byte[] bytes = Convert.FromBase64String(“R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==”); Image image; using (MemoryStream ms = new MemoryStream(bytes)) { image = Image.FromStream(ms); } return image; } It … Read more
Your conclusion that padding is unnecessary is right. It’s always possible to determine the length of the input unambiguously from the length of the encoded sequence. However, padding is useful in situations where base64 encoded strings are concatenated in such a way that the lengths of the individual sequences are lost, as might happen, for … Read more
It seems you just need to add padding to your bytes before decoding. There are many other answers on this question, but I want to point out that (at least in Python 3.x) base64.b64decode will truncate any extra padding, provided there is enough in the first place. So, something like: b’abc=” works just as well … Read more
Base64 is not encryption — it’s an encoding. It’s a way of representing binary data using only printable (text) characters. See this paragraph from the wikipedia page for HTTP Basic Authentication: While encoding the user name and password with the Base64 algorithm typically makes them unreadable by the naked eye, they are as easily decoded … Read more
The problem is that data:image/png;base64, is included in the encoded contents. This will result in invalid image data when the base64 function decodes it. Remove that data in the function before decoding the string, like so. function base64_to_jpeg($base64_string, $output_file) { // open the output file for writing $ifp = fopen( $output_file, ‘wb’ ); // split … Read more