private Hunk gethunk()
{
_ChkPos();
int off1 = 1 + _Off;
int off2 = 2 + _Off;
int a1 = diff.cdif[off1 - 2];
int a2 = diff.cdif[off1] - 1;
int b1 = diff.cdif[off2 - 2];
int b2 = diff.cdif[off2] - 1;
bool s = same();
return new Hunk(diff.left, diff.right, a1, a2, b1, b2, s);
}