80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
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/*
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* Extended Boot Option ROM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corporation, 2007
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* Authors: Anthony Liguori <aliguori@us.ibm.com>
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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FILE *fin, *fout;
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char buffer[512], oldbuffer[512];
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int i, size, lag = 0;
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uint8_t sum = 0;
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if (argc != 3) {
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printf("Usage: %s ROM OUTPUT\n", argv[0]);
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return 1;
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}
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fin = fopen(argv[1], "rb");
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fout = fopen(argv[2], "wb");
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if (fin == NULL || fout == NULL) {
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fprintf(stderr, "Could not open input/output files\n");
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return 1;
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}
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do {
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size = fread(buffer, 512, 1, fin);
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if (size == 1) {
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for (i = 0; i < 512; i++)
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sum += buffer[i];
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if (lag) {
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if (fwrite(oldbuffer, 512, 1, fout) != 1) {
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fprintf(stderr, "Write failed\n");
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return 1;
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}
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}
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lag = 1;
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memcpy(oldbuffer, buffer, 512);
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}
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} while (size == 1);
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if (size != 0) {
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fprintf(stderr, "Failed to read from input file\n");
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return 1;
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}
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oldbuffer[511] = -sum;
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if (fwrite(oldbuffer, 512, 1, fout) != 1) {
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fprintf(stderr, "Failed to write to output file\n");
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return 1;
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}
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fclose(fin);
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fclose(fout);
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return 0;
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}
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