According to Rob Pike, your code almost never needs to take into account the endianness of the machine it’s running on. From his blog post (linked below):

“The entire Plan 9 system ran, without architecture-dependent #ifdefs of any kind, on dozens of computers of different makes, models, and byte orders. I promise you, your computer’s byte order doesn’t matter even at the level of the operating system.”

http://commandcenter.blogspot.com/2012/04/byte-order-fallacy.html