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// Copyright 2021 Colin Finck <colin@reactos.org>
// SPDX-License-Identifier: GPL-2.0-or-later
mod attribute_list_non_resident;
mod non_resident;
mod resident;
pub use attribute_list_non_resident::*;
pub use non_resident::*;
pub use resident::*;
use binread::io;
use binread::io::{Read, Seek, SeekFrom};
use crate::error::{NtfsError, Result};
use crate::traits::NtfsReadSeek;
#[derive(Clone, Debug)]
pub enum NtfsAttributeValue<'n, 'f> {
Resident(NtfsResidentAttributeValue<'f>),
NonResident(NtfsNonResidentAttributeValue<'n, 'f>),
AttributeListNonResident(NtfsAttributeListNonResidentAttributeValue<'n, 'f>),
}
impl<'n, 'f> NtfsAttributeValue<'n, 'f> {
pub fn attach<'a, T>(self, fs: &'a mut T) -> NtfsAttributeValueAttached<'n, 'f, 'a, T>
where
T: Read + Seek,
{
NtfsAttributeValueAttached::new(fs, self)
}
pub fn data_position(&self) -> Option<u64> {
match self {
Self::Resident(inner) => inner.data_position(),
Self::NonResident(inner) => inner.data_position(),
Self::AttributeListNonResident(inner) => inner.data_position(),
}
}
pub fn len(&self) -> u64 {
match self {
Self::Resident(inner) => inner.len(),
Self::NonResident(inner) => inner.len(),
Self::AttributeListNonResident(inner) => inner.len(),
}
}
}
impl<'n, 'f> NtfsReadSeek for NtfsAttributeValue<'n, 'f> {
fn read<T>(&mut self, fs: &mut T, buf: &mut [u8]) -> Result<usize>
where
T: Read + Seek,
{
match self {
Self::Resident(inner) => inner.read(fs, buf),
Self::NonResident(inner) => inner.read(fs, buf),
Self::AttributeListNonResident(inner) => inner.read(fs, buf),
}
}
fn seek<T>(&mut self, fs: &mut T, pos: SeekFrom) -> Result<u64>
where
T: Read + Seek,
{
match self {
Self::Resident(inner) => inner.seek(fs, pos),
Self::NonResident(inner) => inner.seek(fs, pos),
Self::AttributeListNonResident(inner) => inner.seek(fs, pos),
}
}
fn stream_position(&self) -> u64 {
match self {
Self::Resident(inner) => inner.stream_position(),
Self::NonResident(inner) => inner.stream_position(),
Self::AttributeListNonResident(inner) => inner.stream_position(),
}
}
}
pub struct NtfsAttributeValueAttached<'n, 'f, 'a, T: Read + Seek> {
fs: &'a mut T,
value: NtfsAttributeValue<'n, 'f>,
}
impl<'n, 'f, 'a, T> NtfsAttributeValueAttached<'n, 'f, 'a, T>
where
T: Read + Seek,
{
fn new(fs: &'a mut T, value: NtfsAttributeValue<'n, 'f>) -> Self {
Self { fs, value }
}
pub fn data_position(&self) -> Option<u64> {
self.value.data_position()
}
pub fn detach(self) -> NtfsAttributeValue<'n, 'f> {
self.value
}
pub fn len(&self) -> u64 {
self.value.len()
}
}
impl<'n, 'f, 'a, T> Read for NtfsAttributeValueAttached<'n, 'f, 'a, T>
where
T: Read + Seek,
{
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.value.read(self.fs, buf).map_err(io::Error::from)
}
}
impl<'n, 'f, 'a, T> Seek for NtfsAttributeValueAttached<'n, 'f, 'a, T>
where
T: Read + Seek,
{
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
self.value.seek(self.fs, pos).map_err(io::Error::from)
}
}
pub(crate) fn seek_contiguous(
stream_position: &mut u64,
length: u64,
pos: SeekFrom,
) -> Result<u64> {
// This implementation is taken from https://github.com/rust-lang/rust/blob/18c524fbae3ab1bf6ed9196168d8c68fc6aec61a/library/std/src/io/cursor.rs
// It handles all signed/unsigned arithmetics properly and outputs the known `io` error message.
let (base_pos, offset) = match pos {
SeekFrom::Start(n) => {
*stream_position = n;
return Ok(n);
}
SeekFrom::End(n) => (length, n),
SeekFrom::Current(n) => (*stream_position, n),
};
let new_pos = if offset >= 0 {
base_pos.checked_add(offset as u64)
} else {
base_pos.checked_sub(offset.wrapping_neg() as u64)
};
match new_pos {
Some(n) => {
*stream_position = n;
Ok(*stream_position)
}
None => Err(NtfsError::Io(io::Error::new(
io::ErrorKind::InvalidInput,
"invalid seek to a negative or overflowing position",
))),
}
}
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