Decodificador de Arquivo Base64

import base64

def decode_base64_file(b64_string: str, output_path: str) -> None:
    """Decode a base64 string (with or without data URL prefix) and write to file."""
    # Strip data URL prefix if present: data:image/png;base64,...
    if "," in b64_string:
        b64_string = b64_string.split(",", 1)[1]
    # Remove whitespace
    b64_string = b64_string.strip().replace("\n", "").replace("\r", "")
    data = base64.b64decode(b64_string)
    with open(output_path, "wb") as f:
        f.write(data)
    print(f"Decoded {len(data)} bytes → {output_path}")

# Encode a file to base64
def encode_file_to_base64(path: str) -> str:
    with open(path, "rb") as f:
        return base64.b64encode(f.read()).decode("utf-8")

# Round-trip example
encoded = encode_file_to_base64("example.png")
decode_base64_file(encoded, "decoded_example.png")