85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
|
/*
|
||
|
|
** Copyright 2001, Travis Geiselbrecht. All rights reserved.
|
||
|
|
** Distributed under the terms of the NewOS License.
|
||
|
|
*/
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
|
||
|
|
#ifndef O_BINARY
|
||
|
|
#define O_BINARY 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void usage(char **argv)
|
||
|
|
{
|
||
|
|
printf("usage: %s bootblock payload outfile\n", argv[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
struct stat st;
|
||
|
|
int err;
|
||
|
|
unsigned int blocks;
|
||
|
|
unsigned char bootsector[1024];
|
||
|
|
unsigned char buf[512];
|
||
|
|
size_t read_size;
|
||
|
|
int infd;
|
||
|
|
int outfd;
|
||
|
|
|
||
|
|
if(argc < 4) {
|
||
|
|
printf("insufficient args\n");
|
||
|
|
usage(argv);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = stat(argv[2], &st);
|
||
|
|
if(err < 0) {
|
||
|
|
printf("error stating file '%s'\n", argv[2]);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
outfd = open(argv[3], O_BINARY|O_WRONLY|O_CREAT|O_TRUNC, 0666);
|
||
|
|
if(outfd < 0) {
|
||
|
|
printf("error: cannot open output file '%s'\n", argv[3]);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// first read the bootblock
|
||
|
|
infd = open(argv[1], O_BINARY|O_RDONLY);
|
||
|
|
if(infd < 0) {
|
||
|
|
printf("error: cannot open bootblock file '%s'\n", argv[1]);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if(read(infd, bootsector, sizeof(bootsector)) < sizeof(bootsector)
|
||
|
|
|| lseek(infd, 0, SEEK_END) != sizeof(bootsector)) {
|
||
|
|
printf ("error: size of bootblock file '%s' must match %d bytes.\n", argv[1], sizeof(bootsector));
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
close(infd);
|
||
|
|
|
||
|
|
// patch the size of the output into bytes 3 & 4 of the bootblock
|
||
|
|
blocks = st.st_size / 512;
|
||
|
|
blocks++;
|
||
|
|
bootsector[2] = (blocks & 0x00ff);
|
||
|
|
bootsector[3] = (blocks & 0xff00) >> 8;
|
||
|
|
|
||
|
|
write(outfd, bootsector, sizeof(bootsector));
|
||
|
|
|
||
|
|
infd = open(argv[2], O_BINARY|O_RDONLY);
|
||
|
|
if(infd < 0) {
|
||
|
|
printf("error: cannot open input file '%s'\n", argv[1]);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
while((read_size = read(infd, buf, sizeof(buf))) > 0) {
|
||
|
|
write(outfd, buf, read_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
close(outfd);
|
||
|
|
close(infd);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|