Help with speeding up a file read

Question

i am reading in a .pco file with the following code:
public static String read(String filename) throws IOException {
          StringBuffer sb = new StringBuffer();
          FileInputStream fis = new FileInputStream(filename);
          filebytes = new byte[fis.available()];
          int offset = 0;
          while (fis.available() > 0) {
               filebytes[offset++]=(byte)fis.read();
          for (int k = 0; k < filebytes.length; k++){
               byte c = filebytes[k];
               if (c >= 0 && c < 32) {
                    c = 32;
               char charc = (char)c;
               sb.append(String.valueOf(charc));
          return sb.toString();
             }it takes forever... can anyone tell me how to speed it up? thanks.

Answer 1

here is what i have now:
public static String read(String filename) throws IOException {
          StringBuffer sb = new StringBuffer();
          File f = new File(filename);
          BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
          int size = (int) f.length(); 
          byte[] data = new byte[size];
          bis.read( data, 0, size );  
          bis.close();
          for (int k = 0; k < data.length; k++) {
               byte c = data[k];
               if (c >= 0 && c < 32) {
                    c = 32;
               sb.append(String.valueOf((char)c));
          return sb.toString();
             }the reason i am putting this into a string is because next i am using indexOf to parse the stream. the above code is working but if anyone has an even better way, let me know!
thanks for the help.