SJIS/JIS conversion algorithm

Pleas if anyone knows i do need a sjis/jis conversion algorithm like JIS-to-SJIS one, published on http://en.wikipedia.org/wiki/Shift_JIS - i need it vice versa. thanks in advance for any help.

If you only need to change encodings, you can try Linux iconv. If you need the pure algorithm, I really don't have a clue.

You should know:

- There is a gap in SJIS high byte from 0xa0 to 0xdf to avoid halfwidth katakana.
- Also a gap in SJIS low byte at 0x7f to avoid DEL.
- One SJIS "row" (0x??40 to 0x??7e and 0x??80 to 0x??fc, 188 chars)
is decomposed into two JIS "rows" (94 chars * 2).

The algorithm is as follows:

int sjis_to_jis(int sjis)
{
int sjis_high = sjis ���� 8, sjis_low = sjis & 255;
int jis_high, jis_low;
// fill SJIS gaps
if (sjis_high ��= 0xe0)
sjis_high -= 0x40;
if (sjis_low ��= 0x80)
--sjis_low;
// "rough" conversion
jis_high = (sjis_high - 0x81) * 2 + 0x21;
jis_low = sjis_low - 0x40 + 0x21;
// fix for JIS even row
if (jis_low �� 0x7e) {
jis_high++;
jis_low -= 94;
}
return (jis_high ���� 8) + jis_low;
}

where I used �� and �� because this forum does not allow
their ASCII counterparts.

This code is meant for explanation and is not very effective.