gistfile1.java

  /**
   * Writes the custom fixed length footer to the stream.
   */
  @Override
  public void finish() throws IOException {
    flush(); // make sure deflater flushes, and counts are accurate

    // Push the custom footer to the output stream
    ByteBuffer footer = ByteBuffer.allocate(26);
    footer.put(FOOTER_CLOSE_DEFLATE);           // 2 bytes: which means the deflate stream can be read in isolation
    footer.putLong(def.getBytesRead());         // 8 bytes: uncompressed length
    footer.putLong(def.getBytesWritten());      // 8 bytes: compressed length
    footer.putLong(getCRC32());                 // 8 bytes: CRC 32
    out.write(footer.array());                  // Straight to the underlying stream, no deflation (Important!)
    out.flush();
  }