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/*
* Extended Boot Option ROM
*
* 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corporation, 2007
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main(int argc, char **argv)
{
FILE *fin, *fout;
char buffer[512], oldbuffer[512];
int i, size, lag = 0;
uint8_t sum = 0;
if (argc != 3) {
printf("Usage: %s ROM OUTPUT\n", argv[0]);
return 1;
}
fin = fopen(argv[1], "rb");
fout = fopen(argv[2], "wb");
if (fin == NULL || fout == NULL) {
fprintf(stderr, "Could not open input/output files\n");
return 1;
}
do {
size = fread(buffer, 512, 1, fin);
if (size == 1) {
for (i = 0; i < 512; i++)
sum += buffer[i];
if (lag) {
if (fwrite(oldbuffer, 512, 1, fout) != 1) {
fprintf(stderr, "Write failed\n");
return 1;
}
}
lag = 1;
memcpy(oldbuffer, buffer, 512);
}
} while (size == 1);
if (size != 0) {
fprintf(stderr, "Failed to read from input file\n");
return 1;
}
oldbuffer[511] = -sum;
if (fwrite(oldbuffer, 512, 1, fout) != 1) {
fprintf(stderr, "Failed to write to output file\n");
return 1;
}
fclose(fin);
fclose(fout);
return 0;
}
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