Collation: special case '.'

[ericwj]

A little thing I found.

Comparing the collation in wimlib with PrjFileNameCompare, just comparing 64K individual characters, the collations are exactly equal except that the dot (\u002e '.') sorts before everything else (except \0).

To make the collations equal, the comparison becomes something like:

u16 c1 = upcase[le16_to_cpu(s1[i])];
u16 c2 = upcase[le16_to_cpu(s2[i])];
if (c1 != c2) {
    if (c1 == '.' && c2) return -1;
    if (c2 == '.' && c1) return +1;
    return (c1 < c2) ? -1 : 1;
}

If the assumption is not made that \0 will never appear.