base64Browser.ts

const dataUrlPrefix = "data:application/octet-stream;base64,";

export async function bufferToBase64(buffer: Uint8Array): Promise<string> {
  const base64url = await new Promise<string>((resolve) => {
    const reader = new FileReader();
    reader.onload = () => resolve(reader.result as string);
    reader.readAsDataURL(new Blob([buffer]));
  });
  return base64url.slice(dataUrlPrefix.length);
}

export async function base64ToBuffer(base64: string): Promise<Uint8Array> {
  const base64url = dataUrlPrefix + base64;
  const response = await fetch(base64url);
  const blob = await response.blob();
  return new Uint8Array(await blob.arrayBuffer());
}

// Test the functions
async function test() {
  const originalBuffer = new Uint8Array([1, 2, 3, 4, 5]);
  console.log("Original buffer:", originalBuffer);
  const base64 = await bufferToBase64(originalBuffer);
  console.log("Base64:", base64);
  const decodedBuffer = await base64ToBuffer(base64);
  console.log("Decoded buffer:", decodedBuffer);
  // Check if the original and decoded buffers are equal
  const isEqual =
    originalBuffer.length === decodedBuffer.length &&
    originalBuffer.every((value, index) => value === decodedBuffer[index]);
  console.log("Buffers are equal:", isEqual);
}