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use core::{mem, slice};
use super::{Record, RecordKind};
unsafe fn text<'a>(ptr: *const u8, max: usize) -> &'a [u8] {
let mut i = 0;
while i < max {
if *ptr.add(i) == 0 {
break;
}
i += 1;
}
slice::from_raw_parts(
ptr,
i
)
}
#[derive(Debug)]
#[repr(packed)]
pub struct CmosEntry {
pub record: Record,
pub bit: u32,
pub length: u32,
pub config: u32,
pub config_id: u32,
}
impl CmosEntry {
pub fn name(&self) -> &[u8] {
unsafe {
text(
(self as *const CmosEntry as usize + mem::size_of::<CmosEntry>()) as *const u8,
self.record.size as usize - mem::size_of::<CmosEntry>()
)
}
}
}
#[derive(Debug)]
#[repr(packed)]
pub struct CmosEnum {
pub record: Record,
pub config_id: u32,
pub value: u32,
}
impl CmosEnum {
pub fn text(&self) -> &[u8] {
unsafe {
text(
(self as *const CmosEnum as usize + mem::size_of::<CmosEnum>()) as *const u8,
self.record.size as usize - mem::size_of::<CmosEnum>()
)
}
}
}
#[derive(Debug)]
pub enum CmosRecord<'a> {
Entry(&'a CmosEntry),
Enum(&'a CmosEnum),
Other(&'a Record),
}
#[derive(Debug)]
#[repr(packed)]
pub struct Cmos {
pub record: Record,
pub header_length: u32,
}
impl Cmos {
pub fn records(&self) -> CmosRecords {
CmosRecords {
table: self,
i: self.header_length as usize,
}
}
}
pub struct CmosRecords<'a> {
table: &'a Cmos,
i: usize,
}
impl<'a> Iterator for CmosRecords<'a> {
type Item = CmosRecord<'a>;
fn next(&mut self) -> Option<CmosRecord<'a>> {
if self.i + mem::size_of::<Record>() <= self.table.record.size as usize {
let address = (self.table as *const Cmos as usize) + self.i;
let record = unsafe { &*(address as *const Record) };
self.i += record.size as usize;
Some(match record.kind {
RecordKind::Option => CmosRecord::Entry(unsafe {
&*(address as *const CmosEntry)
}),
RecordKind::OptionEnum => CmosRecord::Enum(unsafe {
&*(address as *const CmosEnum)
}),
_ => CmosRecord::Other(record),
})
} else {
None
}
}
}