Hi David,
This might be an unusual question because mysql always stores in little
endian for all platforms (if I'm not mistaken). However, I am receiving
data from several different platforms (custom boards with various
processors) in raw form. I will have stored as a configuration option
what endianess it is.
So what I need to do is write a procdure, or use a mysql function (if
there is one available) to byte swap the data (for integer types). I'm
really just hoping someone has done this, or it is implemented as a mysql
function and I just wasn't able to find it.
This seems very strange that you're storing it in raw form. Are you
sure that you actually are?
Anyway, swapping between big/little endian is not difficult in C.
The code is all here:
http://jcole.us/svn/libmygis/mygis.h
e.g.:
#define SWAP(x, y) { (x) ^= (y) ^= (x) ^= (y); }
#define MYGIS_SWAP4(pos) { \
SWAP(((byte *)(pos))[0], ((byte *)(pos))[3]); \
SWAP(((byte *)(pos))[1], ((byte *)(pos))[2]); \
}
That's enough to swap 32-bits (4-bytes) of whatever is stored at any
pointer address.
I would encourage that you:
a. make sure you really are storing the data raw -- it seems very odd
b. stop storing the data raw... do the swap before storing
Can you give more details about what you're doing?
Regards,
Jeremy
--
Jeremy Cole
MySQL Geek, Yahoo! Inc.
Desk: 408 349 5104
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