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// Copyright 2021 Colin Finck <colin@reactos.org>
// SPDX-License-Identifier: GPL-2.0-or-later
use crate::attribute_value::NtfsAttributeValue;
use crate::error::Result;
use crate::index_record::NtfsIndexRecord;
use crate::structured_values::index_root::NtfsIndexRoot;
use crate::structured_values::NewNtfsStructuredValue;
use crate::traits::NtfsReadSeek;
use binread::io::{Read, Seek, SeekFrom};
use core::iter::FusedIterator;
#[derive(Clone, Debug)]
pub struct NtfsIndexAllocation<'n> {
value: NtfsAttributeValue<'n>,
}
impl<'n> NtfsIndexAllocation<'n> {
pub fn iter(&self, index_root: &NtfsIndexRoot) -> NtfsIndexRecords<'n> {
let index_record_size = index_root.index_record_size();
NtfsIndexRecords::new(self.value.clone(), index_record_size)
}
}
impl<'n> NewNtfsStructuredValue<'n> for NtfsIndexAllocation<'n> {
fn new<T>(_fs: &mut T, value: NtfsAttributeValue<'n>, _length: u64) -> Result<Self>
where
T: Read + Seek,
{
Ok(Self { value })
}
}
#[derive(Clone, Debug)]
pub struct NtfsIndexRecords<'n> {
value: NtfsAttributeValue<'n>,
index_record_size: u32,
}
impl<'n> NtfsIndexRecords<'n> {
fn new(value: NtfsAttributeValue<'n>, index_record_size: u32) -> Self {
Self {
value,
index_record_size,
}
}
pub fn attach<'a, T>(self, fs: &'a mut T) -> NtfsIndexRecordsAttached<'n, 'a, T>
where
T: Read + Seek,
{
NtfsIndexRecordsAttached::new(fs, self)
}
pub fn next<T>(&mut self, fs: &mut T) -> Option<Result<NtfsIndexRecord<'n>>>
where
T: Read + Seek,
{
if self.value.stream_position() >= self.value.len() {
return None;
}
// Get the current record.
let record = iter_try!(NtfsIndexRecord::new(
fs,
self.value.clone(),
self.index_record_size
));
// Advance our iterator to the next record.
iter_try!(self
.value
.seek(fs, SeekFrom::Current(self.index_record_size as i64)));
Some(Ok(record))
}
}
pub struct NtfsIndexRecordsAttached<'n, 'a, T>
where
T: Read + Seek,
{
fs: &'a mut T,
index_records: NtfsIndexRecords<'n>,
}
impl<'n, 'a, T> NtfsIndexRecordsAttached<'n, 'a, T>
where
T: Read + Seek,
{
fn new(fs: &'a mut T, index_records: NtfsIndexRecords<'n>) -> Self {
Self { fs, index_records }
}
pub fn detach(self) -> NtfsIndexRecords<'n> {
self.index_records
}
}
impl<'n, 'a, T> Iterator for NtfsIndexRecordsAttached<'n, 'a, T>
where
T: Read + Seek,
{
type Item = Result<NtfsIndexRecord<'n>>;
fn next(&mut self) -> Option<Self::Item> {
self.index_records.next(self.fs)
}
}
impl<'n, 'a, T> FusedIterator for NtfsIndexRecordsAttached<'n, 'a, T> where T: Read + Seek {}
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