LEINT16
header->id = LEINT16(hdr, PCI_EXROM_DATA_VENDOR_ID) |
(LEINT16(hdr, PCI_EXROM_DATA_DEVICE_ID) << 16);
header->structure_length = LEINT16(hdr, PCI_EXROM_DATA_LENGTH);
header->image_length = LEINT16(hdr, PCI_EXROM_DATA_IMAGE_LENGTH) << 16;
header->data_revision = LEINT16(hdr, PCI_EXROM_DATA_DATA_REV);