void DbfStream::SetCharset(byte cs)
{
	charset = cs;
	byte dest = GetDefaultCharset();
	if(dest == CHARSET_UTF8)
		dest = CHARSET_WIN1252;
	codepage_cv = false;
	for(int i = 0; i < 256; i++) {
		codepage_uni[i] = ToUnicode(i, charset);
		codepage_map[i] = FromUnicode(codepage_uni[i], dest);
		codepage_rev[i] = FromUnicode(ToUnicode(i, dest), charset);
		if(codepage_map[i] != i)
			codepage_cv = true;
	}
}