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// Copyright 2021 Colin Finck <colin@reactos.org>
// SPDX-License-Identifier: GPL-2.0-or-later
use crate::attribute::NtfsAttributeType;
use crate::attribute_value::NtfsAttributeValue;
use crate::error::{NtfsError, Result};
use crate::structured_values::NewNtfsStructuredValue;
use binread::io::{Read, Seek};
use binread::{BinRead, BinReaderExt};
/// Size of all [`IndexRootHeader`] fields plus some reserved bytes.
const INDEX_ROOT_HEADER_SIZE: u64 = 32;
#[derive(BinRead, Clone, Debug)]
struct IndexHeader {
entries_offset: u32,
index_size: u32,
allocated_size: u32,
flags: u8,
}
#[derive(BinRead, Clone, Debug)]
struct IndexRootHeader {
ty: u32,
collation_rule: u32,
index_block_size: u32,
clusters_per_index_block: i8,
reserved: [u8; 3],
index: IndexHeader,
}
#[derive(Clone, Debug)]
pub struct NtfsIndexRoot {
header: IndexRootHeader,
}
impl<'n> NewNtfsStructuredValue<'n> for NtfsIndexRoot<'n> {
fn new<T>(fs: &mut T, value: NtfsAttributeValue<'n>, _length: u64) -> Result<Self>
where
T: Read + Seek,
{
if value.len() < INDEX_ROOT_HEADER_SIZE {
return Err(NtfsError::InvalidStructuredValueSize {
position: value.data_position().unwrap(),
ty: NtfsAttributeType::IndexRoot,
expected: INDEX_ROOT_HEADER_SIZE,
actual: value.len(),
});
}
let mut value_attached = value.clone().attach(fs);
let header = value_attached.read_le::<IndexRootHeader>()?;
Ok(Self { header })
}
}
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