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 /*
28 * valid_srecord.c: to get and check an S-record string from a file
29 * (firmware image to be downloaded to the service processor)
30 */
31
32 #include <stdio.h>
33 #include <string.h>
34
35 #include "adm.h"
36
37
38 static unsigned long
ADM_string_to_long(char * s,int chars)39 ADM_string_to_long(char *s, int chars)
40 {
41 unsigned long val = 0;
42
43 while (chars--) {
44 val = val << 4;
45 if ((*s >= '0') && (*s <= '9'))
46 val += *s - '0';
47 else if ((*s >= 'a') && (*s <= 'f'))
48 val += *s - 'a' + 10;
49 else if ((*s >= 'A') && (*s <= 'F'))
50 val += *s - 'A' + 10;
51 s++;
52 }
53 return (val);
54 }
55
56
57 int
ADM_Valid_srecord(FILE * FilePtr)58 ADM_Valid_srecord(FILE *FilePtr)
59 {
60 static char Line[ADM_LINE_SIZE];
61 char *CurrentChar;
62 int SrecordLength;
63 int Sum;
64
65
66 if (fgets(Line, ADM_LINE_SIZE, FilePtr) == NULL)
67 return (SREC_ERR_LINE_TOO_BIG);
68
69 rewind(FilePtr);
70
71 if (strlen(Line) < 4)
72 return (SREC_ERR_LINE_TOO_SMALL);
73
74 /* Check first two characters for validity */
75 if ((Line[0] != 'S') || (Line[1] < '0') || (Line[1] > '9'))
76 return (SREC_ERR_BAD_HEADER);
77
78 /* Next check the length for validity */
79 SrecordLength = ADM_string_to_long(Line+2, 2);
80 if (SrecordLength > ((strlen(Line) - 4) / 2))
81 return (SREC_ERR_WRONG_LENGTH);
82
83 /* Check the checksum. */
84 CurrentChar = &Line[2]; /* Skip s-record header */
85 SrecordLength += 1; /* Include checksum */
86 Sum = 0;
87 while (SrecordLength--) {
88 Sum += ADM_string_to_long(CurrentChar, 2);
89 CurrentChar += 2;
90 }
91
92 if ((Sum & 0xFF) != 0xFF)
93 return (SREC_ERR_BAD_CRC); /* checksum failed */
94 else
95 return (SREC_OK); /* checksum passed */
96 }
97