inputstream to bytearray with md5 hashing ioctx

putObject.java

 public void putObject(final InputStream inputStream, final String objectName, final int bufferSize) throws Exception {
        int length = inputStream.available();
        byte[] buffer = new byte[bufferSize];
        int bytesRead;
        int offset = 0;
        logger.info("Copying file with objectName: {}", objectName);
        MessageDigest md = MessageDigest.getInstance("MD5");

        while ((bytesRead = inputStream.read(buffer)) > 0) {
            md.update(buffer, 0, bytesRead);
            logger.debug("Bytes read: {} offset: {} length: {}", bytesRead, offset, (length - offset));
            ioContext.truncate(objectName, offset);
            ioContext.write(objectName, buffer, offset);
            offset += bytesRead;
        }
        byte[] digest = md.digest();
        ioContext.writeAttribute(objectName, "MD5", new String(Hex.encodeHex(digest)));
    }