public static ByteString wrap(final byte[] bs, final int offset, final int len) {
        return ByteString.wrap(bs, offset, len);
    }
Wrap a byte array into a ByteString.
@param bs     the byte array
@param offset read start offset in array
@param len    read data length
@return the    result byte string.
jraft-core/src/main/java/com/google/protobuf/ZeroByteStringHelper.java