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Bagpuss

Bigendian Vs Littleendian

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Anyone know of a way to tell if a compiler you are using is big or little ended ? I am reading a lump of data into a structure, and have finally figured out that it''s all stored in reverse to what is in the file. (if I do fs.read(..)) if I do fs>>var1, then fs>>var2 etc, all the data is read in correctly, but each variable is in reverse to what I would expect from looking at the file. Any comments ? Bp.

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int a = 1;
if(*(char*)&a)
little_endian = true;

If you''re on a little endian system, and reading big endian (aka network byte order) data, use ntoh?.

You can also read byte for byte, constructing the number yourself:

static inline u32 read32(const u8* p)
{
u32 t = 0;
for(int i = 0; i < 32; i += 8)
t |= (*p++) << i;

return t;
}

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