Method fillBuffer

src/main/java/com/google/gson/stream/JsonReader.java:817–834

Returns true once limit - pos >= minimum. If the data is exhausted before that many characters are available, this returns false.

(int minimum)

   * false.
   */
  private boolean fillBuffer(int minimum) throws IOException {
    if (limit != pos) {
      limit -= pos;
      System.arraycopy(buffer, pos, buffer, 0, limit);
    } else {
      limit = 0;
    }

    pos = 0;
    int total;
    while ((total = in.read(buffer, limit, buffer.length - limit)) != -1) {
      limit += total;
      if (limit >= minimum) {
        return true;
      }
    }
    return false;
  }

  private int nextNonWhitespace() throws IOException {
    while (pos < limit || fillBuffer(1)) {