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 40 static unsigned long 41 ADM_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 59 int 60 ADM_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