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/*
Copyright (C) 2000-2001 Jos Roberto B. de A. Monteiro <jrm@autsens.com>
and Pedro Zorzenon Neto <pzn@autsens.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "intelhex.h"
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <string.h>
int intelhex_fileopen (inteldata *id, char *filename, int mode) {
/* mode = 1 -> open file for reading */
/* 0 -> creates a new file for writing */
/* TODO: please, check if the file already exists before overwriting */
if (mode==0) {
id->file=fopen(filename,"w");
if (id->file==NULL) {
printf("File create error\n");
abort(); }
id->eof_found=0;
return 1;
}
id->file=fopen(filename,"r+");
if (id->file==NULL) {
printf("Error when opening the file '%s' for reading.\n",filename);
abort(); }
id->eof_found=0;
return 1;
}
int intelhex_fileclose (inteldata * id) {
return fclose(id->file);
}
int intelhex_readline (inteldata * id) {
/* returns:
0 EOF found
1 line read ok
>1 some error occoured
*/
char line[526], conv[5];
int rectype, chksum, linelen, reccount, i;
/* verifies eof and eof_record */
if (id->eof_found==1) return 0; /* eof_record found */
if (feof(id->file)) {
printf("error in intelhex file - eof_record not found\n");
return 2; }
/* reads a line from stdin (hex file format) */
fgets(line, 525, id->file);
/* changes CR+LF to FL if needed and checks if LF is present */
linelen=strlen(line);
if (line[linelen-2] == 13)
{
line[linelen-2]=line[linelen-1];
line[linelen-1]=0;
linelen=strlen(line);
}
if (line[linelen-1] != 10) {
printf("error in intelhex file - linefeed not found at end of line\n");
return 3; }
/* checks for record mark */
if (line[0] != 0x3a) {
printf("error in intelhex file - ':' missing\n"); return 4; }
/* verifies the minimum linelength */
if (linelen < 12) {
printf("error in intelhex file - less than 11 characters in a line\n");
return 5; }
/* verifies the checksum */
conv[2]=0; chksum=0;
for(i=1; i<(linelen-1); i+=2) {
conv[0]=line[i]; conv[1]=line[i+1];
chksum+=(int)strtoul(conv,(char **)NULL,16); }
if (chksum % 256) {
printf("error in intelhex file - bad chksum\n"); return 6; }
/* reads record length */
conv[2]=0; i=1;
conv[0]=line[i]; conv[1]=line[i+1]; i+=2;
id->reclen=(int)strtoul(conv,(char **)NULL,16);
/* checks if linelength is (reclength*2 + 12) */
if (((id->reclen*2)+12) != linelen) {
printf("error in intelhex file - number of characters doesn't match reclength\n");
return 7; }
/* reads load offset */
conv[4]=0; conv[0]=line[i]; conv[1]=line[i+1];
conv[2]=line[i+2]; conv[3]=line[i+3]; i+=4;
id->offset=(int)strtoul(conv,(char **)NULL,16);
/* reads record type */
conv[2]=0; conv[0]=line[i]; conv[1]=line[i+1]; i+=2;
rectype=(int)strtoul(conv,(char **)NULL,16);
/* returns if rectype is 01 (eof_record) */
if(rectype==1) {
id->eof_found=1;
return 0; /* eof_record found */ }
/* checks if rectype is 00 */
if(rectype!=0) {
printf("error in intelhex file - this program only accepts rectype 00(data) or 01(eof)\n");
return 8; }
/* reads record data */
for(reccount=0; reccount<id->reclen; reccount++) {
conv[0]=line[i]; conv[1]=line[i+1]; i+=2;
id->recdata[reccount]=(int)strtoul(conv,(char **)NULL,16); }
return 1; /* successfull read - data available */
}
int intelhex_writeline (inteldata * id) {
unsigned int chksum;
int reccount;
if (id->reclen==0 || id->reclen>255 || id->offset<0 || id->offset>0xffff) {
printf("error in intelhex file - offset/reclen invalid when writing file\n");
return 0;
}
fprintf(id->file, ":%02X%04X00", id->reclen, id->offset);
chksum = id->reclen; /* reclength */
chksum += id->offset % 256; /* low 8 bits of load offset */
chksum += id->offset / 256; /* high 8 bits of load offset */
/* chksum += 0x00; //rectype */
for (reccount=0; reccount<id->reclen; reccount++) {
fprintf(id->file, "%02X", id->recdata[reccount]);
chksum += id->recdata[reccount];
}
chksum = 256 - (chksum % 256);
if (chksum==256) chksum=0;
fprintf(id->file, "%02X\n", chksum);
return 1;
}
void intelhex_writeeof (inteldata * id) {
fputs(":00000001FF\n", id->file);
}
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