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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
#define RTL_PRODUCT_MAGIC1 0x59a0e842
#define SQUASH_MAGIC 0x73717368
#define RTL_IMAGE_VERSION 1
#define RTL_IMAGE_TYPE_RDIR 0xb162
#define RTL_IMAGE_TYPE_BOOT 0xea43
#define RTL_IMAGE_TYPE_RUN 0x8dc9
#define RTL_IMAGE_TYPE_KFS 0xd92f
#define RTL_IMAGE_TYPE_CCFG 0x2a05
#define RTL_IMAGE_TYPE_DCFG 0x6ce8
#define RTL_IMAGE_TYPE_LOG 0xc371
#define ENDIAN_SWITCH32(x) (((x) >> 24) | \
(((x) >> 8) & 0xFF00) | \
(((x) << 8) & 0xFF0000) | \
(((x) << 24) &0xFF000000))
#define ENDIAN_SWITCH16(x) ((((x) >> 8) & 0xFF) | \
(((x) << 8) & 0xFF00))
struct image_header {
u_int32_t magic1;
u_int16_t type;
u_int8_t ver;
u_int8_t align1;
u_int16_t year;
u_int8_t mon;
u_int8_t day;
u_int8_t hour;
u_int8_t min;
u_int8_t sec;
u_int8_t align2;
u_int32_t len;
u_int16_t align3;
u_int8_t icsum;
u_int8_t hcsum;
};
void print_header(struct image_header *h)
{
printf("Magic1: 0x%08x\n", ENDIAN_SWITCH32(h->magic1));
printf("Type: 0x%04x\n", ENDIAN_SWITCH16(h->type));
printf("Version: %d\n", h->ver);
printf("Built: %04d-%02d-%02d %02d:%02d:%02d\n",
ENDIAN_SWITCH16(h->year), h->mon, h->day, h->hour,
h->min, h->sec);
printf("Length: %ld\n", ENDIAN_SWITCH32(h->len));
printf("Checksums: 0x%02x (header), 0x%02x (image)\n",
h->hcsum, h->icsum);
}
void *do_mmap(char *filename, int size, int readonly)
{
int fd;
int openflags = O_RDWR | O_CREAT | O_TRUNC;
int protflags = PROT_READ | PROT_WRITE;
void *ptr;
struct stat st;
if (readonly) {
openflags = O_RDONLY;
protflags = PROT_READ;
}
if (!size) {
if (!readonly)
goto failed;
if (stat(filename, &st) != 0) {
perror("stat failed");
goto failed;
}
size = st.st_size;
}
if (!size)
goto failed;
if ((fd = open(filename, openflags, 0644)) == -1) {
perror("open failed");
goto failed;
}
if (!readonly)
ftruncate(fd, size);
ptr = mmap(0, size, protflags, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
perror("mmap failed");
goto mmap_failed;
}
return ptr;
mmap_failed:
close(fd);
failed:
return NULL;
}
int write_image(char *kernel, char *outfile)
{
unsigned char type;
unsigned long ksize, padded;
unsigned long i;
unsigned char ch, *src, *dst;
struct stat st;
struct image_header *h;
time_t tt;
struct tm *ut;
tt = time(NULL);
ut = localtime(&tt);
if (stat(kernel, &st) != 0)
error(-1, "stat %s failed", kernel);
ksize = st.st_size;
padded = sizeof(struct image_header) +
ksize + ksize % 4; /* fs starts 32-bit aligned (?check) */
h = (struct image_header *)do_mmap(outfile, padded, 0);
if (!h)
return -1;
memset(h, 0, sizeof(struct image_header));
dst = (unsigned char *)((unsigned)h + sizeof(struct image_header));
src = (unsigned char *)do_mmap(kernel, ksize, 1);
if (!src)
return -1;
for (i = 0; i < ksize; i++) {
dst[i] = src[i];
h->icsum ^= src[i];
}
for (i = 0; i < ksize % 4; i++)
dst[ksize + i] = 0;
munmap(src, ksize);
h->magic1 = ENDIAN_SWITCH32(RTL_PRODUCT_MAGIC1);
h->type = ENDIAN_SWITCH16(RTL_IMAGE_TYPE_RUN);
h->ver = RTL_IMAGE_VERSION;
h->year = ENDIAN_SWITCH16(ut->tm_year + 1900);
h->mon = ut->tm_mon + 1;
h->day = ut->tm_mday;
h->hour = ut->tm_hour;
h->min = ut->tm_min;
h->sec = ut->tm_sec;
h->len = ENDIAN_SWITCH32(padded - sizeof(struct image_header));
for (i = 0; i < (sizeof(struct image_header) - 1); i++)
h->hcsum ^= ((unsigned char *)&h)[i];
munmap(h, padded);
return 0;
}
void usage(void)
{
exit(1);
}
int main(int argc, char *argv[])
{
if (argc < 3) usage();
printf("%d\n", sizeof(struct image_header));
if (!strncmp(argv[1], "info", 4)) {
print_header((struct image_header *)do_mmap(argv[2],
0, 1));
} else if (!strncmp(argv[1], "pack", 4)) {
write_image(argv[2], argv[3]);
} else {
usage();
}
return 0;
}
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