1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * valid_srecord.c: to get and check an S-record string from a file
31 * (firmware image to be downloaded to the service processor)
32 */
33
34#include <stdio.h>
35#include <string.h>
36
37#include "adm.h"
38
39
40static unsigned long
41ADM_string_to_long(char *s, int chars)
42{
43	unsigned long val = 0;
44
45	while (chars--) {
46		val = val << 4;
47		if ((*s >= '0') && (*s <= '9'))
48			val += *s - '0';
49		else if ((*s >= 'a') && (*s <= 'f'))
50			val += *s - 'a' + 10;
51		else if ((*s >= 'A') && (*s <= 'F'))
52			val += *s - 'A' + 10;
53		s++;
54	}
55	return (val);
56}
57
58
59int
60ADM_Valid_srecord(FILE  *FilePtr)
61{
62	static char	Line[ADM_LINE_SIZE];
63	char		*CurrentChar;
64	int		SrecordLength;
65	int		Sum;
66
67
68	if (fgets(Line, ADM_LINE_SIZE, FilePtr) == NULL)
69		return (SREC_ERR_LINE_TOO_BIG);
70
71	rewind(FilePtr);
72
73	if (strlen(Line) < 4)
74		return (SREC_ERR_LINE_TOO_SMALL);
75
76	/* Check first two characters for validity */
77	if ((Line[0] != 'S') || (Line[1] < '0') || (Line[1] > '9'))
78		return (SREC_ERR_BAD_HEADER);
79
80	/* Next check the length for validity */
81	SrecordLength = ADM_string_to_long(Line+2, 2);
82	if (SrecordLength > ((strlen(Line) - 4) / 2))
83		return (SREC_ERR_WRONG_LENGTH);
84
85	/* Check the checksum. */
86	CurrentChar	= &Line[2];	/* Skip s-record header */
87	SrecordLength	+= 1;		/* Include checksum */
88	Sum		= 0;
89	while (SrecordLength--) {
90		Sum		+= ADM_string_to_long(CurrentChar, 2);
91		CurrentChar	+= 2;
92	}
93
94	if ((Sum & 0xFF) != 0xFF)
95		return (SREC_ERR_BAD_CRC); /* checksum failed */
96	else
97		return (SREC_OK); /* checksum passed */
98}
99