ecc.c

前有人传的imagewrite中少了文件ecc.c,根本不能编译成功,见图err,现把完整文件改名了上传

/*
 * Pre-calculated 256-way 1 byte column parity
 */
static const u_char nand_ecc_precalc_table[] = {
	0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00,
	0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
	0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
	0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
	0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
	0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
	0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
	0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
	0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,
	0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,
	0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,
	0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,
	0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,
	0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,
	0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,
	0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00
};


/*
 * Creates non-inverted ECC code from line parity
 */
static void nand_trans_result(u_char reg2, u_char reg3,
	u_char *ecc_code)
{
	u_char a, b, i, tmp1, tmp2;
	
	/* Initialize variables */
	a = b = 0x80;
	tmp1 = tmp2 = 0;
	
	/* Calculate first ECC byte */
	for (i = 0; i < 4; i++) {
		if (reg3 & a)		/* LP15,13,11,9 --> ecc_code[0] */
			tmp1 |= b;
		b >>= 1;
		if (reg2 & a)		/* LP14,12,10,8 --> ecc_code[0] */
			tmp1 |= b;
		b >>= 1;
		a >>= 1;
	}
	
	/* Calculate second ECC byte */
	b = 0x80;
	for (i = 0; i < 4; i++) {
		if (reg3 & a)		/* LP7,5,3,1 --> ecc_code[1] */
			tmp2 |= b;
		b >>= 1;
		if (reg2 & a)		/* LP6,4,2,0 --> ecc_code[1] */
			tmp2 |= b;
		b >>= 1;
		a >>= 1;
	}
	
	/* Store two of the ECC bytes */
	ecc_code[0] = tmp1;
	ecc_code[1] = tmp2;
}

/*
 * Calculate 3 byte ECC code for 256 byte block
 */
void nand_calculate_ecc (const u_char *dat, u_char *ecc_code)
{
	u_char idx, reg1, reg2, reg3;
	int j;
	
	/* Initialize variables */
	reg1 = reg2 = reg3 = 0;
	ecc_code[0] = ecc_code[1] = ecc_code[2] = 0;
	
	/* Build up column parity */ 
	for(j = 0; j < 256; j++) {
		
		/* Get CP0 - CP5 from table */
		idx = nand_ecc_precalc_table[dat[j]];
		reg1 ^= (idx & 0x3f);
		
		/* All bit XOR = 1 ? */
		if (idx & 0x40) {
			reg3 ^= (u_char) j;
			reg2 ^= ~((u_char) j);
		}
	}
	
	/* Create non-inverted ECC code from line parity */
	nand_trans_result(reg2, reg3, ecc_code);
	
	/* Calculate final ECC code */
	ecc_code[0] = ~ecc_code[0];
	ecc_code[1] = ~ecc_code[1];
	ecc_code[2] = ((~reg1) << 2) | 0x03;
}