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CommitLineData
6fc57dcd 1#include <stdio.h>
7215c018 2#include <stdint.h>
6fc57dcd 3
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4#define POLY 0x04c11db7
5
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6uint32_t rsb_crc(uint32_t r11_crc, uint8_t *r10_buf, uint32_t r14_len) {
7 uint32_t r6_pos = 0;
8 uint32_t r3_data;
9 int32_t r5_bit;
972ac24b 10
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11 while (r6_pos < r14_len) {
12 r3_data = (*(r6_pos+r10_buf)) << 24;
13 r11_crc = r11_crc ^ r3_data;
972ac24b 14
c8b1eccb 15 r5_bit = 8;
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16
17 do {
c8b1eccb 18 r3_data = r11_crc & 0x80000000;
972ac24b 19
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20 if (r3_data != 0) {
21 r3_data = r11_crc << 1;
22 r11_crc = r3_data ^ POLY;
972ac24b 23 } else {
c8b1eccb 24 r11_crc = r11_crc << 1;
972ac24b 25 }
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26 r5_bit--;
27 } while (r5_bit);
972ac24b 28
c8b1eccb 29 r6_pos++;
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30 }
31
c8b1eccb 32 return r11_crc;
972ac24b 33}
6fc57dcd 34
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35uint32_t rsb_crc2(uint8_t *r0_buf, uint32_t r1_buflen, uint32_t r2_magic, uint32_t *crc_out) {
36 uint32_t r4_len;
37 uint32_t file_crc;
6fc57dcd 38
7215c018 39 r4_len = *(uint32_t*)(r0_buf + 0x20);
6fc57dcd 40
7215c018 41 if (*((uint32_t*)(r0_buf + 0x24)) != r2_magic)
85feabf9 42 return 2; /* MAGIC does not match */
6fc57dcd 43
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44 if (r1_buflen < r4_len)
45 return 3; /* image to small */
6fc57dcd 46
a4019508 47 *crc_out = ~rsb_crc(~0x0, r0_buf, r4_len);
6fc57dcd 48
7215c018 49 file_crc = *((uint32_t*)(r0_buf + r4_len));
6fc57dcd 50
a4019508 51 if (file_crc != *crc_out)
01004d01 52 return 4;
6fc57dcd 53
01004d01 54 return 0;
6fc57dcd 55}
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