/*
* 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 1.11 2009-03-06 17:20:50 wookey Exp $";
-
#include "yportenv.h"
#include "yaffs_ecc.h"
/* Count the bits in an unsigned char or a U32 */
-static int yaffs_CountBits(unsigned char x)
+static int yaffs_count_bits(unsigned char x)
{
int r = 0;
while (x) {
return r;
}
-static int yaffs_CountBits32(unsigned x)
+static int yaffs_count_bits32(unsigned x)
{
int r = 0;
while (x) {
}
/* Calculate the ECC for a 256-byte block of data */
-void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc)
+void yaffs_ecc_cacl(const unsigned char *data, unsigned char *ecc)
{
unsigned int i;
/* Correct the ECC on a 256 byte block of data */
-int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
const unsigned char *test_ecc)
{
unsigned char d0, d1, d2; /* deltas */
return 1; /* Corrected the error */
}
- if ((yaffs_CountBits(d0) +
- yaffs_CountBits(d1) +
- yaffs_CountBits(d2)) == 1) {
+ if ((yaffs_count_bits(d0) +
+ yaffs_count_bits(d1) +
+ yaffs_count_bits(d2)) == 1) {
/* Reccoverable error in ecc */
read_ecc[0] = test_ecc[0];
/*
* ECCxxxOther does ECC calcs on arbitrary n bytes of data
*/
-void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
- yaffs_ECCOther *eccOther)
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+ yaffs_ecc_other *ecc_other)
{
unsigned int i;
unsigned line_parity_prime = 0;
unsigned char b;
- for (i = 0; i < nBytes; i++) {
+ for (i = 0; i < n_bytes; i++) {
b = column_parity_table[*data++];
col_parity ^= b;
}
- eccOther->colParity = (col_parity >> 2) & 0x3f;
- eccOther->lineParity = line_parity;
- eccOther->lineParityPrime = line_parity_prime;
+ ecc_other->col_parity = (col_parity >> 2) & 0x3f;
+ ecc_other->line_parity = line_parity;
+ ecc_other->line_parity_prime = line_parity_prime;
}
-int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
- yaffs_ECCOther *read_ecc,
- const yaffs_ECCOther *test_ecc)
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+ yaffs_ecc_other *read_ecc,
+ const yaffs_ecc_other *test_ecc)
{
- unsigned char cDelta; /* column parity delta */
- unsigned lDelta; /* line parity delta */
- unsigned lDeltaPrime; /* line parity delta */
+ unsigned char delta_col; /* column parity delta */
+ unsigned delta_line; /* line parity delta */
+ unsigned delta_line_prime; /* line parity delta */
unsigned bit;
- cDelta = read_ecc->colParity ^ test_ecc->colParity;
- lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
- lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
+ delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
+ delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
+ delta_line_prime = read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
- if ((cDelta | lDelta | lDeltaPrime) == 0)
+ if ((delta_col | delta_line | delta_line_prime) == 0)
return 0; /* no error */
- if (lDelta == ~lDeltaPrime &&
- (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15)) {
+ if (delta_line == ~delta_line_prime &&
+ (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
/* Single bit (recoverable) error in data */
bit = 0;
- if (cDelta & 0x20)
+ if (delta_col & 0x20)
bit |= 0x04;
- if (cDelta & 0x08)
+ if (delta_col & 0x08)
bit |= 0x02;
- if (cDelta & 0x02)
+ if (delta_col & 0x02)
bit |= 0x01;
- if (lDelta >= nBytes)
+ if (delta_line >= n_bytes)
return -1;
- data[lDelta] ^= (1 << bit);
+ data[delta_line] ^= (1 << bit);
return 1; /* corrected */
}
- if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
- yaffs_CountBits(cDelta)) == 1) {
+ if ((yaffs_count_bits32(delta_line) + yaffs_count_bits32(delta_line_prime) +
+ yaffs_count_bits(delta_col)) == 1) {
/* Reccoverable error in ecc */
*read_ecc = *test_ecc;