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