MP_OFF_PAGE_LENGTH
cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;