5 RT-Thread固件打包工具HDR_CRC32怎么计算出来的

52 42 4C 00 00 00 00 00 70 7F 9F 5F 61 70 70 00 00 00 00 00 00 00 00 00 00 00 00 00 31 2E 30 2E
30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30 30 30 31 30 32 30 33 30 34 30 35
30 36 30 37 30 38 30 39 00 00 00 00 78 6B 41 E2 9F A8 27 92 D8 92 00 00 D8 92 00 00 66 F1 08 C7
52 42 4C                      RBL                                                                                        0-7      len:8
70 7F 9F 5F                  1604288368    (TIMESTAMP 时间戳)                                     8-11    len:4
61 70 70                       app                 (分区名)                                                          12-27  len:16
31 2E 30 2E 30             1.0.0                (版本号)                                                          28-51  len:24
30 30 30 31 30 32 30 33 30 34 30 35 30 36 30 37 30 38 30 39      00 01 02 03 04 05 06 07 08 09        52-75    len:24
78 6B 41 E2                     BODY_CRC32                    76-79            len:4
9F A8 27 92                     HASH_CODE                     80-83            len:4
D8 92                              RAW_SIZE                          84-87            len:4
D8 92                              PKG_SIZE                           88-91            len:4
66 F1 08 C7                     HDR_CRC32                      92:95             len:4