#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
typedef struct s_file
{
unsigned int len;
unsigned char *file;
unsigned int fcrt_offset;
int fcrt_len;
unsigned char fcrt_meta[4];
} t_file;
void quit(int status)
{
printf("nPress <enter> to continuen");
fgetc(stdin);
exit(status);
}
void load_nand(char *file, t_file *nand)
{
size_t len;
FILE *stream;
struct stat sb;
if (stat(file, &sb) == -1)
{
perror("stat");
quit(EXIT_FAILURE);
}
if (sb.st_size != 17301504)
{
fprintf(stdout, "The filesize is incorrect.n");
quit(EXIT_FAILURE);
}
nand->len = 0;
printf("Allocating memoryn");
nand->file = malloc(sb.st_size * sizeof(*(nand->file)));
if ((stream = fopen(file, "rb")) == NULL)
{
perror("fopen");
quit(EXIT_FAILURE);
}
printf("Load nand into memoryn");
while ((len = fread(nand->file + nand->len, 1, 512, stream)) > 0)
{
nand->len += len;
}
if (nand->len != sb.st_size)
{
fprintf(stdout, "The entire file could not be read.n");
quit(EXIT_FAILURE);
}
fclose(stream);
}
int get_fcrt_str(t_file *nand)
{
int offset = 0;
char *pattern = "fcrt.bin";
int plen = strlen(pattern);
printf("Starting search for %sn", pattern);
while (nand->len - offset > plen)
{
if (strncmp(pattern, nand->file + offset, plen) == 0)
{
return (offset + 16);
}
offset++;
}
return (-1);
}
unsigned int read_nb(char *file, int offset, int len)
{
unsigned int nb = 0;
int i = 0;
while (i < len)
{
nb = nb * 256 + (file[offset + i] & 255);
++i;
}
return (nb);
}
void get_fcrt_info(t_file *nand, int offset)
{
nand->fcrt_offset = read_nb(nand->file, offset, 8);
printf("Data start block is at offset %#.4xn", nand->fcrt_offset);
offset += 8;
nand->fcrt_len = read_nb(nand->file, offset, 4);
offset += 4;
printf("Fcrt lenght is %dn", nand->fcrt_len);
strncpy(nand->fcrt_meta, nand->file + offset, 4);
printf("Meta is : %x %x %x %xn",
nand->fcrt_meta[0],nand->fcrt_meta[1], nand->fcrt_meta[2], nand->fcrt_meta[3]);
}
void write_fcrt(t_file *nand)
{
FILE *stream;
int offset;
int writed = 0;
if ((stream = fopen("fcrt.bin", "wb+")) == NULL)
{
perror("fopen");
quit(EXIT_FAILURE);
}
offset = nand->fcrt_offset * 16896;
while (writed < nand->fcrt_len)
{
fwrite(nand->file + offset, 1, 0x200, stream);
writed += 0x200;
offset += 0x210;
}
fclose(stream);
if ((stream = fopen("fcrt.bin.meta", "wb+")) == NULL)
{
perror("open");
quit(EXIT_FAILURE);
}
fwrite(nand->fcrt_meta, 1, 4, stream);
fclose(stream);
}
int main(int argc, char *argv[])
{
int offset;
t_file nand;
printf("---------------------------------------------------------------n"
" fcrt eXtractor v0.03 by BestPign"
"---------------------------------------------------------------n");
if (argc < 2)
{
printf("Usage:n"
" fcrt_extractor.exe nand.binn");
}
else
{
load_nand(argv[1], &nand);
offset = get_fcrt_str(&nand);
if (offset < 0)
{
printf("No fcrt.bin found in this nand.n");
quit(EXIT_FAILURE);
}
get_fcrt_info(&nand, offset);
write_fcrt(&nand);
}
quit(EXIT_SUCCESS);
return (0);
}
