Crass dec=xror option encrypted problem.

hello. I'm korean and I can't speak english well.
please understand even if you can't understand me clearly.

I have got a question.
A few days ago, I had got crass source, this file name is cui-1.0.4-src.
I tried to source interpretation, but the problem is here.

This is dec=xror parameter decode source of crass tool.
---------------------------------------------------------------------------------------
// xror
static void xp3filter_decode_xor_ror(BYTE *buf, DWORD len, DWORD offset, DWORD hash)
{
BYTE shift, xor;

shift = (BYTE)hash;
xor = (BYTE)((hash >> 8) & 0xff);
if (!shift)
shift = 15;
if (!xor)
xor = 0xf0;

shift &= 7;
for (DWORD i = offset; i < offset + len; i++) {
buf[i] ^= xor;
buf[i] = (buf[i] >> shift) | (buf[i] << (8 - shift));
}
}
---------------------------------------------------------------------------------------
I needed to repacker, source is changed. (exclusive or=xor)

(before) for (DWORD i = offset; i < offset + len; i++) {
buf[i] ^= xor;
buf[i] = (buf[i] >> shift) | (buf[i] << (8 - shift));}

(after) for (DWORD i = offset; i < offset + len; i++) {
buf[i] = (buf[i] << shift) | (buf[i] >> (8 - shift));
buf[i] ^= xor;}

and then, I'm got CUI file from solution build to Visual Studio 2008.
I can package it back to .xp3 form but Executable is Fail when SWANSONG.
I'm certain to .xp3 file problem but not ANSI or Unicode problem.

I don't know what solution.
How can I do?

please give me the soultion of dec=xror encryption. (xp3 repack)
thank you and have a nice day.