remote upgrade EPCS config data

How did you write rbf file into EPCS? I have EPCS16 on my board and I can read and write into the EPCS16 using SPI. Now using this SPI, I want to write rbf file into EPCS. But there are plenty of bytes in rbf file. So it seems very difficult to apply bit-reversal to each byte manually. Is there any easy way to write these bytes into EPCS? Is there a way to read the contents of rbf file using SPI or UART?