/* decode_stub.c - Don Yang (uguu.org)

   08/09/12
                                                                           */

#include<stdio.h>

static void Decode(char *data, int *total_size)
{
   char *r, *w;
   unsigned int buffer, buffer_size;

   buffer = buffer_size = 0;
   *total_size = 0;
   for(r = w = data; *r > '%'; r++)
   {
      buffer = buffer * 85 + (83 + *r) % 89;
      buffer_size++;
      if( buffer_size == 5 )
      {
         /* XOR with ISAAC here */
         while( --buffer_size > 0 )
         {
            *w++ = buffer & 0xff;
            buffer >>= 8;
         }
         *total_size += 4;
      }
   }
   *total_size -= *r % 5;
}

int main(void)
{
   char data[] = "oHbR&qdEE6~VdPj_iTJ6$";
   int total_size;

   Decode(data, &total_size);
   fwrite(data, total_size, 1, stdout);
   return 0;
}