static int computePreferredBufferSize(int dataLength)
    {
        if (dataLength > DEFAULT_BUFFER_SIZE)
            return DEFAULT_BUFFER_SIZE;
        return dataLength;
    }
Returns the buffer size to efficiently write dataLength bytes to this CodedOutput. Used by AbstractMessageLite.

@return the buffer size to efficiently write dataLength bytes to this CodedOutput.
protostuff-core/src/test/java/io/protostuff/CodedOutput.java