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Returns true
if the dominant "endianness" of the
module, or the current file being processed,
is big-endian, otherwise false. This does not guarantee
that all numbers in the module follow the dominant endianness,
particularly as formats sometimes incorporate data stored in
a previously defined format. For some formats, e.g., TIFF, the
endianness depends on the file being processed.
Every module must initialize the value of _bigEndian for this
function, or else assign its value when parsing a file,
to return a meaningful result. For some modules (e.g.,
ASCII, endianness has no meaning.