سير العمل البرمجي · تعارضات حدود MIME المتحفظة

import re

def boundary_conflicts(boundary, parts):
    if type(boundary) is not bytes or re.fullmatch(rb"[A-Za-z0-9_-]{1,70}", boundary) is None:
        raise ValueError("mime.boundary")
    if type(parts) is not list or len(parts) > 64 or any(type(p) is not bytes or len(p) > 65536 for p in parts):
        raise ValueError("mime.parts")
    marker = b"--"+boundary
    return [i for i, part in enumerate(parts) if part.startswith(marker) or b"\r\n"+marker in part]