rar.py 文件源码

def rar_v4(f):
    # based on http://www.forensicswiki.org/wiki/RAR
    # and http://acritum.com/winrar/rar-format
    while True:
        pos = f.tell()
        crc, typ, flags, size = struct.unpack('<HBHH', f.read(7))
        if flags & 0x8000:
            size += struct.unpack('<L', f.read(4))[0]
        if not 0x72 <= typ <= 0x7b:
            raise FileCorrupted
        f.try_seek(pos + size, os.SEEK_SET)
        # f.try_seek(size, os.SEEK_CUR)
        f.update_pos()
        if typ == 0x7b:
            break
        elif typ == 0x73 and flags & 0x80:
            return Ellipsis  # encrypted, assume bad faith
    return True