Hi All.

I've been playing with some CRC code and discovered some neat things.

normally when calculatig CRC-32 the register is seeded with -1 and  after
processing the data, inverted

with a slightly different table those steps are unneccessary.

A regular CRC table can be translated into one that used with the same
algorithm produces the same result when seeded with 0 and not inverted.
Here's how.

void make_new_crctab (void)
 {
 int n;
 for(n=0;n<256;n++) MagicCRC32tab[n]=CRC32tab[n^0xff]^0xff000000;
 }

These same values can also be determined by taking the CRC32 of a buffer
containg a single byte equal to the table index :)

-=> Bye <=-

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