gistfile1.txt

static gint msi_base64_decode(gint x)
{
    if (x < 10)
        return x + '0';
    if (x < (10 + 26))
        return x - 10 + 'A';
    if (x < (10 + 26 + 26))
        return x - 10 - 26 + 'a';
    if (x == (10 + 26 + 26))
        return '.';
    return '_';
}

static void msi_decode(const guint8 *in, gchar *out)
{
    guint count = 0;
    guint8 *q = (guint8 *)out;

    /* utf-8 encoding of 0x4840 */
    if (in[0] == 0xe4 && in[1] == 0xa1 && in[2] == 0x80) {
        *q++ = 0x06;
        in += 3;
    }

    while (*in) {
        guint8 ch = *in;
        if ((ch == 0xe3 && in[1] >= 0xa0) || (ch == 0xe4 && in[1] < 0xa0)) {
            *q++ = msi_base64_decode(in[2] & 0x7f);
            *q++ = msi_base64_decode(in[1] ^ 0xa0);
            in += 3;
            count += 2;
            continue;
        }
        if (ch == 0xe4 && in[1] == 0xa0) {
            *q++ = msi_base64_decode(in[2] & 0x7f);
            in += 3;
            count++;
            continue;
        }
        *q++ = *in++;
        if (ch >= 0xc1)
            *q++ = *in++;
        if (ch >= 0xe0)
            *q++ = *in++;
        if (ch >= 0xf0)
            *q++ = *in++;
        count++;
    }
    *q = 0;
}