chunked.py

def parse_chunked(data):
    result = b""
    state = "header"
    while data:
        if state == "header":
            chunk, data = data.split(b"\r\n", 1)
            length = int(chunk.strip(), 16)
            if length == 0:
                state = "finished"
            else:
                state = "body"
        elif state == "body":
            chunk, data = data[:length], data[length:]
            result += chunk
            state = "footer"
        elif state == "footer":
            chunk, data = data.split(b"\r\n", 1)
            state = "header"
        elif state == "finished":
            if data is None or data.strip() == b"":
                break
            else:
                raise RuntimeError("Data After Last Chunk")
                break
    return result