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#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#ifndef _BSD_SOURCE
#define _BSD_SOURCE /* See feature_test_macros(7) */
#endif
#include <endian.h>
int main(int argc, char**argv)
{
struct stat s;
int c;
int fd;
uint32_t size = 0;
char *file = NULL;
int ret = 1;
int is_bigendian = 0;
char magic[8];
int ignore_unknown = 0;
while ((c = getopt (argc, argv, "if:b")) != -1) {
switch (c) {
case 'f':
file = optarg;
break;
case 'b':
is_bigendian = 1;
break;
case 'i':
ignore_unknown = 1;
break;
}
}
if (!file) {
fprintf(stderr, "missing file\n");
return 1;
}
if (stat(file, &s)) {
perror("stat");
return 1;
}
fd = open(file, O_RDWR);
if (fd < 0) {
perror("open");
return 1;
}
ret = lseek(fd, 0x20, SEEK_SET);
if (ret < 0) {
perror("lseek");
ret = 1;
goto err;
}
ret = read(fd, magic, sizeof(magic));
if (ret < 0) {
perror("read");
ret = 1;
goto err;
}
if (strcmp(magic, "barebox")) {
fprintf(stderr, "invalid magic\n");
if (ignore_unknown)
ret = 0;
else
ret = 1;
goto err;
}
ret = lseek(fd, 0x2c, SEEK_SET);
if (ret < 0) {
perror("lseek");
ret = 1;
goto err;
}
size = s.st_size;
if (is_bigendian)
size = htobe32(size);
else
size = htole32(size);
ret = write(fd, &size, 4);
if (ret != 4) {
perror("write");
ret = 1;
goto err;
}
ret = 0;
err:
close(fd);
return ret;
}
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