VPD_INFO_FLD_HDR_SIZE
for (i = offset; (i + VPD_INFO_FLD_HDR_SIZE) <= (offset + len);) {
i += VPD_INFO_FLD_HDR_SIZE;
i += VPD_INFO_FLD_HDR_SIZE + buf[i+2];
i = vpd[sn - VPD_INFO_FLD_HDR_SIZE + 2];