S文件解码

static byte[] readFile(File sfile) {

       return FileUtils.readFileToByteArray(sfile)

   }


   static String byte2string(byte[] b, int start, int end) {

       StringBuilder s = new StringBuilder();

       for (int i = 0; i < (end - start); i++) {

           s.append((char) b[i + start]);

       }

       return s.toString();

   }


   static int getInt(byte[] b, int start, int end) {

       int v = getUInt(b, start, end);

       if ((int) b[end] < 0) // is a negative

           v -= 1 << (end - start + 1) * 8;

       return v;

   }


   static int getUInt(byte[] b, int start, int end) {

       int v = 0;

       for (int i = start; i <= end; i++) {

           int k = i - start;

           int j = (int) b[i] >= 0 ? b[i] : ((int) b[i] + 256) % 256;

           v += j << (k * 8);

       }

       return v;

   }