mkimage.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <stdint.h>
   5 #include <arpa/inet.h>
   6
   7 static void usage(const char *progname);
   8
   9 static unsigned char header_magic[] =
  10 {
  11         0x0F, 0xAC, 0xE0, 0xFF, 0xDE, 0xAD, 0xBA, 0xBE
  12 };
  13
  14 /*
  15  * main
  16  */
  17 int main(int argc, char **argv)
  18 {
  19         FILE *in, *out;
  20         uint32_t size;
  21         unsigned char buf[4096];
  22         int nread, n;
  23
  24         if (argc != 3)
  25                 usage(argv[0]);
  26
  27         in = fopen(argv[1], "r");
  28         if (in == NULL)
  29         {
  30                 fprintf(stderr, "couldn't open file '%s'\n", argv[1]);
  31                 exit(1);
  32         }
  33
  34         out = fopen(argv[2], "w");
  35         if (out == NULL)
  36         {
  37                 fprintf(stderr, "couldn't open file '%s'\n", argv[2]);
  38                 exit(1);
  39         }
  40
  41
  42         n = fwrite(header_magic, 1, sizeof(header_magic), out);
  43         if (n != sizeof(header_magic))
  44         {
  45                 fprintf(stderr, "fwrite failed\n");
  46                 exit(1);
  47         }
  48
  49         size = 0;
  50
  51         n = fwrite(&size, 1, sizeof(size), out);
  52         if (n != sizeof(size))
  53         {
  54                 fprintf(stderr, "fwrite failed\n");
  55                 exit(1);
  56         }
  57
  58         n = fseek(in, 0, SEEK_END);
  59         if (n < 0)
  60         {
  61                 fprintf(stderr, "fseek failed\n");
  62                 exit(1);
  63         }
  64
  65         size = ftell(in);
  66
  67         n = fseek(in, 0, SEEK_SET);
  68         if (n < 0)
  69         {
  70                 fprintf(stderr, "fseek failed\n");
  71                 exit(1);
  72         }
  73
  74         size = htonl(size);
  75
  76         n = fwrite(&size, 1, sizeof(size), out);
  77         if (n != sizeof(size))
  78         {
  79                 fprintf(stderr, "fwrite failed\n");
  80                 exit(1);
  81         }
  82
  83         n = fseek(out, 0x400, SEEK_SET);
  84         if (n < 0)
  85         {
  86                 fprintf(stderr, "fseek failed\n");
  87                 exit(1);
  88         }
  89
  90         while ((nread = fread(buf, 1, sizeof(buf), in)) > 0)
  91         {
  92                 n = fwrite(buf, 1, nread, out);
  93                 if (n != nread)
  94                 {
  95                         fprintf(stderr, "fwrite failed\n");
  96                         exit(1);
  97                 }
  98         }
  99
 100         fclose(in);
 101         fclose(out);
 102
 103         exit(0);
 104 }
 105
 106 /*
 107  * usage
 108  */
 109 static void usage(const char *progname)
 110 {
 111         fprintf(stderr, "usage: %s <input file> <output file>\n", progname);
 112         exit(1);
 113 }