compile_s7_format
- 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
Pasted 2026-08-23 12:34:47
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