[people/ms/u-boot.git] / fs / yaffs2 / yaffs_ecc.c

/*
 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
 *
 * Copyright (C) 2002-2011 Aleph One Ltd.
 *   for Toby Churchill Ltd and Brightstar Engineering
 *
 * Created by Charles Manning <charles@aleph1.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * This code implements the ECC algorithm used in SmartMedia.
 *
 * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
 * The two unused bit are set to 1.
 * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
 * such ECC blocks are used on a 512-byte NAND page.
 *
 */

#include "yportenv.h"

#include "yaffs_ecc.h"

/* Table generated by gen-ecc.c
 * Using a table means we do not have to calculate p1..p4 and p1'..p4'
 * for each byte of data. These are instead provided in a table in bits7..2.
 * Bit 0 of each entry indicates whether the entry has an odd or even parity,
 * and therefore this bytes influence on the line parity.
 */

static const unsigned char column_parity_table[] = {
	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
};


/* Calculate the ECC for a 256-byte block of data */
void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
{
	unsigned int i;
	unsigned char col_parity = 0;
	unsigned char line_parity = 0;
	unsigned char line_parity_prime = 0;
	unsigned char t;
	unsigned char b;

	for (i = 0; i < 256; i++) {
		b = column_parity_table[*data++];
		col_parity ^= b;

		if (b & 0x01) {	/* odd number of bits in the byte */
			line_parity ^= i;
			line_parity_prime ^= ~i;
		}
	}

	ecc[2] = (~col_parity) | 0x03;

	t = 0;
	if (line_parity & 0x80)
		t |= 0x80;
	if (line_parity_prime & 0x80)
		t |= 0x40;
	if (line_parity & 0x40)
		t |= 0x20;
	if (line_parity_prime & 0x40)
		t |= 0x10;
	if (line_parity & 0x20)
		t |= 0x08;
	if (line_parity_prime & 0x20)
		t |= 0x04;
	if (line_parity & 0x10)
		t |= 0x02;
	if (line_parity_prime & 0x10)
		t |= 0x01;
	ecc[1] = ~t;

	t = 0;
	if (line_parity & 0x08)
		t |= 0x80;
	if (line_parity_prime & 0x08)
		t |= 0x40;
	if (line_parity & 0x04)
		t |= 0x20;
	if (line_parity_prime & 0x04)
		t |= 0x10;
	if (line_parity & 0x02)
		t |= 0x08;
	if (line_parity_prime & 0x02)
		t |= 0x04;
	if (line_parity & 0x01)
		t |= 0x02;
	if (line_parity_prime & 0x01)
		t |= 0x01;
	ecc[0] = ~t;

}

/* Correct the ECC on a 256 byte block of data */

int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
		      const unsigned char *test_ecc)
{
	unsigned char d0, d1, d2;	/* deltas */

	d0 = read_ecc[0] ^ test_ecc[0];
	d1 = read_ecc[1] ^ test_ecc[1];
	d2 = read_ecc[2] ^ test_ecc[2];

	if ((d0 | d1 | d2) == 0)
		return 0;	/* no error */

	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
	    ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
		/* Single bit (recoverable) error in data */

		unsigned byte;
		unsigned bit;

		bit = byte = 0;

		if (d1 & 0x80)
			byte |= 0x80;
		if (d1 & 0x20)
			byte |= 0x40;
		if (d1 & 0x08)
			byte |= 0x20;
		if (d1 & 0x02)
			byte |= 0x10;
		if (d0 & 0x80)
			byte |= 0x08;
		if (d0 & 0x20)
			byte |= 0x04;
		if (d0 & 0x08)
			byte |= 0x02;
		if (d0 & 0x02)
			byte |= 0x01;

		if (d2 & 0x80)
			bit |= 0x04;
		if (d2 & 0x20)
			bit |= 0x02;
		if (d2 & 0x08)
			bit |= 0x01;

		data[byte] ^= (1 << bit);

		return 1;	/* Corrected the error */
	}

	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
		/* Reccoverable error in ecc */

		read_ecc[0] = test_ecc[0];
		read_ecc[1] = test_ecc[1];
		read_ecc[2] = test_ecc[2];

		return 1;	/* Corrected the error */
	}

	/* Unrecoverable error */

	return -1;

}

/*
 * ECCxxxOther does ECC calcs on arbitrary n bytes of data
 */
void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
			  struct yaffs_ecc_other *ecc_other)
{
	unsigned int i;
	unsigned char col_parity = 0;
	unsigned line_parity = 0;
	unsigned line_parity_prime = 0;
	unsigned char b;

	for (i = 0; i < n_bytes; i++) {
		b = column_parity_table[*data++];
		col_parity ^= b;

		if (b & 0x01) {
			/* odd number of bits in the byte */
			line_parity ^= i;
			line_parity_prime ^= ~i;
		}

	}

	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
	ecc_other->line_parity = line_parity;
	ecc_other->line_parity_prime = line_parity_prime;
}

int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
			    struct yaffs_ecc_other *read_ecc,
			    const struct yaffs_ecc_other *test_ecc)
{
	unsigned char delta_col;	/* column parity delta */
	unsigned delta_line;	/* line parity delta */
	unsigned delta_line_prime;	/* line parity delta */
	unsigned bit;

	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 ((delta_col | delta_line | delta_line_prime) == 0)
		return 0;	/* no error */

	if (delta_line == ~delta_line_prime &&
	    (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
		/* Single bit (recoverable) error in data */

		bit = 0;

		if (delta_col & 0x20)
			bit |= 0x04;
		if (delta_col & 0x08)
			bit |= 0x02;
		if (delta_col & 0x02)
			bit |= 0x01;

		if (delta_line >= n_bytes)
			return -1;

		data[delta_line] ^= (1 << bit);

		return 1;	/* corrected */
	}

	if ((hweight32(delta_line) +
	     hweight32(delta_line_prime) +
	     hweight8(delta_col)) == 1) {
		/* Reccoverable error in ecc */

		*read_ecc = *test_ecc;
		return 1;	/* corrected */
	}

	/* Unrecoverable error */

	return -1;
}
Commit	Line	Data
0e8cc8bd WJ	1	/*
	2	* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
	3	*
753ac610	4	* Copyright (C) 2002-2011 Aleph One Ltd.
0e8cc8bd WJ	5	* for Toby Churchill Ltd and Brightstar Engineering
	6	*
	7	* Created by Charles Manning <charles@aleph1.co.uk>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	/*
	15	* This code implements the ECC algorithm used in SmartMedia.
	16	*
4b070809	17	* The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
0e8cc8bd	18	* The two unused bit are set to 1.
753ac610 CM	19	* The ECC can correct single bit errors in a 256-byte page of data. Thus, two
753ac610 CM	20	* such ECC blocks are used on a 512-byte NAND page.
0e8cc8bd WJ	21	*
	22	*/
	23
753ac610 CM	24	#include "yportenv.h"
	25
	26	#include "yaffs_ecc.h"
	27
0e8cc8bd WJ	28	/* Table generated by gen-ecc.c
	29	* Using a table means we do not have to calculate p1..p4 and p1'..p4'
	30	* for each byte of data. These are instead provided in a table in bits7..2.
753ac610 CM	31	* Bit 0 of each entry indicates whether the entry has an odd or even parity,
753ac610 CM	32	* and therefore this bytes influence on the line parity.
0e8cc8bd WJ	33	*/
0e8cc8bd WJ	34
0e8cc8bd WJ	35	static const unsigned char column_parity_table[] = {
	36	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
	37	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
	38	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
	39	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
	40	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
	41	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
	42	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
	43	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
	44	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
	45	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
	46	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
	47	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
	48	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
	49	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
	50	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
	51	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
	52	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
	53	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
	54	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
	55	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
	56	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
	57	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
	58	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
	59	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
	60	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
	61	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
	62	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
	63	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
	64	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
	65	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
	66	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
	67	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
	68	};
	69
0e8cc8bd WJ	70
0e8cc8bd WJ	71	/* Calculate the ECC for a 256-byte block of data */
753ac610	72	void yaffs_ecc_calc(const unsigned char data, unsigned char ecc)
0e8cc8bd WJ	73	{
0e8cc8bd WJ	74	unsigned int i;
0e8cc8bd WJ	75	unsigned char col_parity = 0;
	76	unsigned char line_parity = 0;
	77	unsigned char line_parity_prime = 0;
	78	unsigned char t;
	79	unsigned char b;
	80
	81	for (i = 0; i < 256; i++) {
	82	b = column_parity_table[*data++];
	83	col_parity ^= b;
	84
753ac610	85	if (b & 0x01) { /* odd number of bits in the byte */
0e8cc8bd WJ	86	line_parity ^= i;
	87	line_parity_prime ^= ~i;
	88	}
0e8cc8bd WJ	89	}
	90
	91	ecc[2] = (~col_parity) \| 0x03;
	92
	93	t = 0;
	94	if (line_parity & 0x80)
	95	t \|= 0x80;
	96	if (line_parity_prime & 0x80)
	97	t \|= 0x40;
	98	if (line_parity & 0x40)
	99	t \|= 0x20;
	100	if (line_parity_prime & 0x40)
	101	t \|= 0x10;
	102	if (line_parity & 0x20)
	103	t \|= 0x08;
	104	if (line_parity_prime & 0x20)
	105	t \|= 0x04;
	106	if (line_parity & 0x10)
	107	t \|= 0x02;
	108	if (line_parity_prime & 0x10)
	109	t \|= 0x01;
	110	ecc[1] = ~t;
	111
	112	t = 0;
	113	if (line_parity & 0x08)
	114	t \|= 0x80;
	115	if (line_parity_prime & 0x08)
	116	t \|= 0x40;
	117	if (line_parity & 0x04)
	118	t \|= 0x20;
	119	if (line_parity_prime & 0x04)
	120	t \|= 0x10;
	121	if (line_parity & 0x02)
	122	t \|= 0x08;
	123	if (line_parity_prime & 0x02)
	124	t \|= 0x04;
	125	if (line_parity & 0x01)
	126	t \|= 0x02;
	127	if (line_parity_prime & 0x01)
	128	t \|= 0x01;
	129	ecc[0] = ~t;
	130
0e8cc8bd WJ	131	}
0e8cc8bd WJ	132
0e8cc8bd WJ	133	/* Correct the ECC on a 256 byte block of data */
0e8cc8bd WJ	134
753ac610 CM	135	int yaffs_ecc_correct(unsigned char data, unsigned char read_ecc,
753ac610 CM	136	const unsigned char *test_ecc)
0e8cc8bd WJ	137	{
	138	unsigned char d0, d1, d2; /* deltas */
	139
	140	d0 = read_ecc[0] ^ test_ecc[0];
	141	d1 = read_ecc[1] ^ test_ecc[1];
	142	d2 = read_ecc[2] ^ test_ecc[2];
	143
	144	if ((d0 \| d1 \| d2) == 0)
753ac610	145	return 0; /* no error */
0e8cc8bd WJ	146
	147	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
	148	((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
	149	((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
	150	/* Single bit (recoverable) error in data */
	151
	152	unsigned byte;
	153	unsigned bit;
	154
0e8cc8bd WJ	155	bit = byte = 0;
	156
	157	if (d1 & 0x80)
	158	byte \|= 0x80;
	159	if (d1 & 0x20)
	160	byte \|= 0x40;
	161	if (d1 & 0x08)
	162	byte \|= 0x20;
	163	if (d1 & 0x02)
	164	byte \|= 0x10;
	165	if (d0 & 0x80)
	166	byte \|= 0x08;
	167	if (d0 & 0x20)
	168	byte \|= 0x04;
	169	if (d0 & 0x08)
	170	byte \|= 0x02;
	171	if (d0 & 0x02)
	172	byte \|= 0x01;
	173
	174	if (d2 & 0x80)
	175	bit \|= 0x04;
	176	if (d2 & 0x20)
	177	bit \|= 0x02;
	178	if (d2 & 0x08)
	179	bit \|= 0x01;
	180
	181	data[byte] ^= (1 << bit);
	182
753ac610	183	return 1; /* Corrected the error */
0e8cc8bd WJ	184	}
0e8cc8bd WJ	185
753ac610	186	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
0e8cc8bd WJ	187	/* Reccoverable error in ecc */
	188
	189	read_ecc[0] = test_ecc[0];
	190	read_ecc[1] = test_ecc[1];
	191	read_ecc[2] = test_ecc[2];
	192
753ac610	193	return 1; /* Corrected the error */
0e8cc8bd	194	}
4b070809	195
0e8cc8bd WJ	196	/* Unrecoverable error */
	197
	198	return -1;
	199
	200	}
	201
0e8cc8bd WJ	202	/*
	203	* ECCxxxOther does ECC calcs on arbitrary n bytes of data
	204	*/
753ac610 CM	205	void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
753ac610 CM	206	struct yaffs_ecc_other *ecc_other)
0e8cc8bd WJ	207	{
0e8cc8bd WJ	208	unsigned int i;
0e8cc8bd WJ	209	unsigned char col_parity = 0;
	210	unsigned line_parity = 0;
	211	unsigned line_parity_prime = 0;
	212	unsigned char b;
	213
753ac610	214	for (i = 0; i < n_bytes; i++) {
0e8cc8bd WJ	215	b = column_parity_table[*data++];
	216	col_parity ^= b;
	217
753ac610	218	if (b & 0x01) {
0e8cc8bd WJ	219	/* odd number of bits in the byte */
	220	line_parity ^= i;
	221	line_parity_prime ^= ~i;
	222	}
	223
	224	}
	225
753ac610 CM	226	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
	227	ecc_other->line_parity = line_parity;
	228	ecc_other->line_parity_prime = line_parity_prime;
0e8cc8bd WJ	229	}
0e8cc8bd WJ	230
753ac610 CM	231	int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
	232	struct yaffs_ecc_other *read_ecc,
	233	const struct yaffs_ecc_other *test_ecc)
0e8cc8bd	234	{
753ac610 CM	235	unsigned char delta_col; /* column parity delta */
	236	unsigned delta_line; /* line parity delta */
	237	unsigned delta_line_prime; /* line parity delta */
0e8cc8bd WJ	238	unsigned bit;
0e8cc8bd WJ	239
753ac610 CM	240	delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
	241	delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
	242	delta_line_prime =
	243	read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
0e8cc8bd	244
753ac610 CM	245	if ((delta_col \| delta_line \| delta_line_prime) == 0)
753ac610 CM	246	return 0; /* no error */
0e8cc8bd	247
753ac610 CM	248	if (delta_line == ~delta_line_prime &&
753ac610 CM	249	(((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
0e8cc8bd WJ	250	/* Single bit (recoverable) error in data */
	251
	252	bit = 0;
	253
753ac610	254	if (delta_col & 0x20)
0e8cc8bd	255	bit \|= 0x04;
753ac610	256	if (delta_col & 0x08)
0e8cc8bd	257	bit \|= 0x02;
753ac610	258	if (delta_col & 0x02)
0e8cc8bd WJ	259	bit \|= 0x01;
0e8cc8bd WJ	260
753ac610	261	if (delta_line >= n_bytes)
0e8cc8bd	262	return -1;
4b070809	263
753ac610	264	data[delta_line] ^= (1 << bit);
0e8cc8bd	265
753ac610	266	return 1; /* corrected */
0e8cc8bd WJ	267	}
0e8cc8bd WJ	268
753ac610 CM	269	if ((hweight32(delta_line) +
	270	hweight32(delta_line_prime) +
	271	hweight8(delta_col)) == 1) {
0e8cc8bd WJ	272	/* Reccoverable error in ecc */
	273
	274	read_ecc = test_ecc;
753ac610	275	return 1; /* corrected */
0e8cc8bd WJ	276	}
	277
	278	/* Unrecoverable error */
	279
	280	return -1;
0e8cc8bd	281	}