Method readerToUTF8Stream

UnLuac/src/unluac/util/FileUtils.java:38–79

(Reader r)

  }
  
  public static InputStream readerToUTF8Stream(Reader r) {
    final CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
    final CharBuffer chars = CharBuffer.allocate(2);
    final ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.limit(0);
    return new InputStream() {

      @Override
      public int read() throws IOException {
        if(buffer.position() < buffer.limit()) {
          return 0xff & buffer.get();
        }
        int result = r.read();
        if(result <= 127) {
          return result;
        }
        char c = (char)result;
        chars.position(0);
        chars.limit(1);
        chars.put(c);
        if(Character.isSurrogate(c)) {
          result = r.read();
          if(result >= 0) {
            chars.limit(2);
            chars.put((char) result);
          }
        }
        chars.position(0);
        buffer.limit(buffer.capacity());
        buffer.position(0);
        encoder.reset();
        CoderResult coderResult = encoder.encode(chars, buffer, true);
        if(coderResult.isError() || coderResult.isOverflow()) {
          throw new IllegalStateException(coderResult.toString());
        }
        buffer.limit(buffer.position());
        buffer.position(0);
        return read();
      }
      
    };
  }
  
  private FileUtils() {}