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import re import struct def compile_s7_format(fmt): s7_fmt = ">" current_size = 0 for match in re.finditer(r"(\d*)([a-zA-Z])", fmt): count_str, dtype = match.groups() count = int(count_str) if count_str else 1 # 1. Sonderfall: Füllbytes (x) direkt unverändert anhängen if dtype == "x": s7_fmt += f"{count}x" current_size += count continue # 2. Alignment berechnen ssize = struct.calcsize(f">{dtype}") if (remainder := current_size % ssize) != 0: padding_bytes = ssize - remainder s7_fmt += f"{padding_bytes}x" current_size += padding_bytes # 3. Den originalen Typ formschlüssig anhängen # Wichtig: Nutzen Sie das originale count_str, um 'f' statt '1f' zu schreiben s7_fmt += f"{count_str}{dtype}" current_size += ssize * count return s7_fmt
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