107 lines
1.5 KiB
C
107 lines
1.5 KiB
C
#define _BSD_SOURCE /* See feature_test_macros(7) */
|
|
#define _DEFAULT_SOURCE
|
|
|
|
#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>
|
|
#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;
|
|
}
|