/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
* this bytes influence on the line parity.
*/
-const char *yaffs_ecc_c_version =
- "$Id: yaffs_ecc.c,v 1.10 2007-12-13 15:35:17 wookey Exp $";
-
#include "yportenv.h"
#include "yaffs_ecc.h"
b = column_parity_table[*data++];
col_parity ^= b;
- if (b & 0x01) // odd number of bits in the byte
- {
+ if (b & 0x01) { /* odd number of bits in the byte */
line_parity ^= i;
line_parity_prime ^= ~i;
}
-
}
ecc[2] = (~col_parity) | 0x03;
ecc[0] = ~t;
#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
- // Swap the bytes into the wrong order
+ /* Swap the bytes into the wrong order */
t = ecc[0];
ecc[0] = ecc[1];
ecc[1] = t;
unsigned bit;
#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
- // swap the bytes to correct for the wrong order
+ /* swap the bytes to correct for the wrong order */
unsigned char t;
t = d0;
* ECCxxxOther does ECC calcs on arbitrary n bytes of data
*/
void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
- yaffs_ECCOther * eccOther)
+ yaffs_ECCOther *eccOther)
{
unsigned int i;
}
int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
- yaffs_ECCOther * read_ecc,
- const yaffs_ECCOther * test_ecc)
+ yaffs_ECCOther *read_ecc,
+ const yaffs_ECCOther *test_ecc)
{
unsigned char cDelta; /* column parity delta */
unsigned lDelta; /* line parity delta */
return 0; /* no error */
if (lDelta == ~lDeltaPrime &&
- (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15))
- {
+ (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15)) {
/* Single bit (recoverable) error in data */
bit = 0;
if (cDelta & 0x02)
bit |= 0x01;
- if(lDelta >= nBytes)
+ if (lDelta >= nBytes)
return -1;
data[lDelta] ^= (1 << bit);
}
if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
- yaffs_CountBits(cDelta)) == 1) {
+ yaffs_CountBits(cDelta)) == 1) {
/* Reccoverable error in ecc */
*read_ecc = *test_ecc;
/* Unrecoverable error */
return -1;
-
}
-