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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
/* this is the beginning of a tool which will eventually
* be able to build rom images with both fallback and
* normal. For now it just builds a single image
* into a rom iamge
*/
/* one switch we already need: -zero allowing you to tell what
* to do with numbers that are "zero": make them 0xff or whatever
* for flash
* For now we assume "zero" is 0xff
*/
void usage()
{
fprintf(stderr, "Usage: buildrom <input> <output> <payload> ");
fprintf(stderr, " <linuxbios-size> <total-size>\n");
exit(1);
}
void fatal(char *s)
{
perror(s);
exit(2);
}
int main(int argc, char *argv[])
{
int infd, payloadfd, outfd, size, insize, readlen, writelen, i;
int romsize;
unsigned char *cp;
struct stat inbuf, payloadbuf;
char zero = 0xff;
if (argc != 6)
usage();
infd = open(argv[1], O_RDONLY);
if (infd < 0)
fatal(argv[1]);
outfd = open(argv[2], O_RDWR | O_CREAT, 0666);
if (outfd < 0)
fatal(argv[2]);
payloadfd = open(argv[3], O_RDONLY);
if (payloadfd < 0)
fatal(argv[3]);
size = strtol(argv[4], 0, 0);
romsize = strtol(argv[5], 0, 0);
if (fstat(infd, &inbuf) < 0)
fatal("stat of infile");
if (inbuf.st_size > size) {
fprintf(stderr, "linuxbios image is %d bytes; only %d allowed\n",
inbuf.st_size, size);
fatal("Linuxbios input file larger than allowed size!\n");
}
if (fstat(payloadfd, &payloadbuf) < 0)
fatal("stat of infile");
if (payloadbuf.st_size > (romsize - size))
fatal("payload + linuxbios size larger than ROM size!\n");
cp = malloc(romsize);
if (!cp)
fatal("malloc buffer");
for (i = 0; i < romsize; i++)
cp[i] = zero;
/* read the input file in at the END of the array */
readlen = read(infd, &cp[romsize - inbuf.st_size], inbuf.st_size);
if (readlen < inbuf.st_size) {
fprintf(stderr, "Wanted %d, got %d\n", inbuf.st_size, readlen);
fatal("Read input file");
}
/* read the payload file in at the START of the array */
readlen = read(payloadfd, cp, payloadbuf.st_size);
if (readlen < payloadbuf.st_size) {
fprintf(stderr, "Wanted %d, got %d\n",
payloadbuf.st_size, readlen);
fatal("Read payload file");
}
writelen = write(outfd, cp, romsize);
if (writelen < size) {
fprintf(stderr, "Wanted %d, got %d\n", size, writelen);
fatal("Write output file");
}
return 0;
}
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