target/linux/etrax-2.6/image/mkfimage/src/mkfimage.c

   1 #include <stdio.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <stdlib.h>
   7
   8 int main(int argc, char **argv){
   9         unsigned char *buffer = malloc(64 * 1024);
  10         struct stat s;
  11         unsigned int size_vmlinux = 0, real_size_vmlinux = 0;
  12         const unsigned char *magic_str = "ACME_PART_MAGIC";
  13         unsigned int loop;
  14         unsigned char *magic;
  15
  16         if(argc != 3){
  17                 printf("%s in out\n", argv[0]);
  18                 return 1;
  19         }
  20
  21         printf("Generating image\n");
  22
  23         FILE *vmlinux = fopen(argv[1], "r");
  24         FILE *vmlinux_out = fopen(argv[2], "w");
  25         if((!vmlinux) || (!vmlinux_out)){
  26                 printf("Error opening a file\n");
  27                 return 1;
  28         }
  29
  30         stat(argv[1], &s);
  31         size_vmlinux = s.st_size;
  32         real_size_vmlinux = (size_vmlinux & 0xffff0000) + 0x10000;
  33
  34         printf("vmlinux = 0x%.08X / 0x%.08X\n", size_vmlinux, real_size_vmlinux);
  35
  36         unsigned int t = fread(buffer, 1, 64 * 1024, vmlinux);
  37         for(loop = 0; loop < (64 * 1024) - sizeof(magic_str); loop++){
  38                 if(buffer[loop] == magic_str[0]){
  39                         if((magic = strstr(&buffer[loop], magic_str))){
  40                                 printf("Magic at 0x%.08X %p %p\n", magic - buffer, magic, buffer);
  41                                 printf("Found Magic %X%X%X%X\n",
  42                                         buffer[loop + strlen(magic_str)],
  43                                         buffer[loop + strlen(magic_str) + 2],
  44                                         buffer[loop + strlen(magic_str) + 1],
  45                                         buffer[loop + strlen(magic_str) + 3]);
  46
  47                                 buffer[loop + strlen(magic_str)] = real_size_vmlinux >> 24;
  48                                 buffer[loop + strlen(magic_str) + 2] = (real_size_vmlinux >> 16) & 0xff;
  49                                 buffer[loop + strlen(magic_str) + 1] = (real_size_vmlinux >> 8) & 0xff;
  50                                 buffer[loop + strlen(magic_str) + 3] = (real_size_vmlinux) & 0xff;
  51
  52                                 printf("Replaced with %.02X%.02X%.02X%.02X\n",
  53                                         buffer[loop + strlen(magic_str)],
  54                                         buffer[loop + strlen(magic_str) + 2],
  55                                         buffer[loop + strlen(magic_str) + 1],
  56                                         buffer[loop + strlen(magic_str) + 3]);
  57
  58                         }
  59                 }
  60         }
  61
  62         fwrite(buffer, 1, 64 * 1024, vmlinux_out);
  63         real_size_vmlinux -= 64 * 1024;
  64         do {
  65                 real_size_vmlinux -= 64 * 1024;
  66                 memset(buffer, 0, 64 * 1024);
  67                 fread(buffer, 1, 64 * 1024, vmlinux);
  68                 fwrite(buffer, 1, 64 * 1024, vmlinux_out);
  69         } while (real_size_vmlinux);
  70
  71         return 0;
  72 }