git.zerfleddert.de Git - rsbs2/blame_incremental

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Commit	Line	Data
	1	#include <stdio.h>
	2	#include <stdint.h>
	3
	4	#define POLY 0x04c11db7
	5
	6	uint32_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;
	10
	11	while (r6_pos < r14_len) {
	12	r3_data = (*(r6_pos+r10_buf)) << 24;
	13	r11_crc = r11_crc ^ r3_data;
	14
	15	r5_bit = 8;
	16
	17	do {
	18	r3_data = r11_crc & 0x80000000;
	19
	20	if (r3_data != 0) {
	21	r3_data = r11_crc << 1;
	22	r11_crc = r3_data ^ POLY;
	23	} else {
	24	r11_crc = r11_crc << 1;
	25	}
	26	r5_bit--;
	27	} while (r5_bit);
	28
	29	r6_pos++;
	30	}
	31
	32	return r11_crc;
	33	}
	34
	35	uint32_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;
	38
	39	r4_len = (uint32_t)(r0_buf + 0x20);
	40
	41	if (((uint32_t)(r0_buf + 0x24)) != r2_magic)
	42	return 2; /* MAGIC does not match */
	43
	44	if (r1_buflen < r4_len)
	45	return 3; /* image to small */
	46
	47	*crc_out = ~rsb_crc(~0x0, r0_buf, r4_len);
	48
	49	file_crc = ((uint32_t)(r0_buf + r4_len));
	50
	51	if (file_crc != *crc_out)
	52	return 4;
	53
	54	return 0;
	55	}